Series 90 Lighted Pushbutton Switches - Staco Systems

Series 90 Lighted Pushbutton Switches

Company History 

Staco Systems has designed and manufactured switches since its commencement 

in 1958. During the early years, a small manufacturing and assembly team 

accomplished the first series 30 switch used in a Fokker F-27 in 1960. Fifty years 

later, Staco Systems has evolved into an internationally recognized, high-tech 

endeavor with numerous experienced experts in manufacturing, engineering, 

sales, and quality control. Our product line has expanded to include rugged 

keyboards and keypads, electronic controllers, and panel assemblies for 

hundreds of applications worldwide. 

Switch History 

1960 1962 1967 1978 1986 

Series 30, 1M 

Fokker F-27 

Series 40 

Lockheed P3 

Rotary Switches 

Douglas DC-7B 

Series 30, 40, 60, 

1M 

Boeing E-3A 

Series 93, 99 

British Aerospace 

Hawk 200 

1988 1989 1991 1996 Today 

Series 97 Matrix 

Northrop B2 

Series 80, 90 

Aeritalia AMX 

Series 90 

Boeing E-8C 

Lockheed F-22 


British Aerospace 

Nimrod 2000 

Full Sub-Assembly 

Capabilities

CONTENTS 

Product Line Overview ................................................................................................................................................2 

Quick Reference Guide .........................................................................................................................................3 

Figure & Table Listings ..........................................................................................................................................4 

Individual Mount ..........................................................................................................................................................5 

Individual Mount, PC or Solder, Switch/Indicators ................................................................................................5 

Display Pushbutton ...............................................................................................................................................6 

Mounting Procedure - Individual Mount, Crimp or Solder ...................................................................................11 

Dimensions - Switch/Indicator, Pushbutton .........................................................................................................12 

Individual Mount, Crimp Pin, Switch/Indicators ...................................................................................................13 

Dimensions - Switch/Indicator .............................................................................................................................14 

Seals - Watertight & Solvent Resistant ...............................................................................................................18 

Matrix Mount ..............................................................................................................................................................21 

Matrix Housing Assemblies .................................................................................................................................21 

Matrix Assembly Exploded Views .......................................................................................................................23 

Dimensions - Rear Flange Mount Matrix Housing ..............................................................................................25 

Dimensions - Front Dress Bezel Matrix Housing ................................................................................................28 

Product Design and Engineering Data ......................................................................................................................31 

Military and Environmental Specifications ...........................................................................................................31 

Electrical and Mechanical Data ...........................................................................................................................33 

Display System ....................................................................................................................................................35 

Incandescent and LED Circuits and Lighting Control .........................................................................................35 

LED Schematics ..................................................................................................................................................36 

Legends ...............................................................................................................................................................39 

Sunlight Readable Displays ................................................................................................................................40 

Night Vision Imaging System Displays................................................................................................................41 

Materials and Quality Standards .........................................................................................................................43 

Military Cross Reference ...........................................................................................................................................44 

MIL-22885/101 ....................................................................................................................................................44 

MIL-22885/112.....................................................................................................................................................47 

Tables ........................................................................................................................................................................50 

Accessories and Other Staco Systems Products .....................................................................................................59 

Ordering Information .................................................................................................................................................63 

Model 91 and 92 .................................................................................................................................................63 

Model 93 ..............................................................................................................................................................64 

Model 98 ..............................................................................................................................................................64 

Model 99 ..............................................................................................................................................................64 

Seals ...................................................................................................................................................................66 

Front Dress Bezel Mount ....................................................................................................................................66 

Rear Flange Mount .............................................................................................................................................67 

Complete Systems ..............................................................................................................................................67 

All information in this catalog is effective on the publication date and is subject to change without notice. 

All printing and clerical errors are subject to correction. 

Visit www.stacosystems.com or call 714-549-3041 for more information 

1

OVERVIEW 

The Staco Systems Series 90 is a broad product line of lighted pushbutton switches and indicators. This catalog 

identifies performance features and options, gives specifications and engineering data, and provides ordering 

information. 

These manually operated, illuminated switch/indicator and pushbutton assemblies are identified as Models 91, 92, 

93, 98, and 99. 

The Series 90 Matrix Housing Assemblies, which utilize these switches and indicators, are identified as Models 

94, 95, 96 and 97. 

This product line meets the general requirements of MIL-S-22885, MIL-STD-3009, and, in matrix form, 

MIL-S-24317. It specifically meets the requirements of MIL-S-22885/101and MIL-S-22885/112. 

2 

SERIES 90 

Lighted Display Pushbutton Switches and Indicators 

• Individual Mount or Matrix Mount 

• Light Weight, Short Length 

• LED or Incandescent Lighting 

• Sunlight Readable Displays 

• Night Vision Goggle Compatible Displays 

• Standard Lighted Displays 

• Numerous Switching Options 

• Popular Termination Styles 

• Dripproof, Splashproof, Watertight (Immersion) Seal, and Solvent 

Resistant Options 

• Qualified to MIL-PRF-22885/101 for Incandescent Lighting 

• 

Qualified to MIL-PRF-22885/112 for High Bright LED Lighting and Short 

Crimp Pin Termination. 

• Meets or Exceeds All Applicable MIL-SPEC Requirements 

• High Impact Shock in Accordance with MIL-S-901

QUICK REFERENCE 

SWITCHES AND INDICATORS 

MODEL DESCRIPTION TERMINATION REFERENCE INFORMATION 

91 Switch or indicator assembly Solder or PCB pp. 5,11, 63 

(without pushbutton) mount fig. 1-4 

in short housing 

92 Display pushbutton assembly Into Models pp. 6, 7, 8, 9, 10, 63 

91 or 98 fig. 5-14 

93 Switch or indicator assembly Solder or PCB pp. 12, 64, 65 

with pushbutton in mount fig. 15-21 

short housing 

98 Switch or indicator (without Crimp pin pp. 13, 14, 15, 16 17, 64 

pushbutton) in long housing 

99 Switch or indicator with Crimp pin pp. 13, 14, 15, 16, 17, 63, 64 

pushbutton in long housing fig. 22-37 

MATRIX HOUSINGS 

MODEL DESCRIPTION TERMINATION REFERENCE INFORMATION 

94 Rear flange mount Solder or PCB pp. 21-22, 25-27, 30 

short housing mount fig. 43, 46-49, 59-60 

95 Rear flange mount Crimp pin pp. 21-27, 29, 67 

long housing fig. 42, 45-49, 59-60 

96 Front dress bezel mount Solder or PCB pp. 21-23, 28-30, 66 

short housing mount fig. 40, 50, 53-54, 59-60 

97 Front dress bezel mount Crimp pin pp. 21-22, 28-30, 66 

long housing fig. 51-55, 59-60 

SPECIAL PART NUMBERS 

PART NUMBER DESCRIPTION PART NUMBER DESCRIPTION 

92PXXXX Unique pushbutton with special 94/XXXX 

artwork or other non-standard 

design requirements. 

63XXXX Standard switch with a 92P 95/XXXX Matrix assembly. Staco Systems 

pushbutton and switches with assigned code for special despecial 

marking or construction. tailed requirements. Includes 

housing, switch, pushbutton 

15XXX Accessories 96/XXXX and any other special features. 

90/005 Immersion Seal/High Impact 

90/006 Shock option. Applicable to 97/XXXX 

models 91, 92, 93, 98 and 99. 


3

4 

Figure Listing 

Fig. Pg. Description 

1 5 Switch schematics, SPDT and DPDT 

2 5 Printed circuit board or solder terminals 

3 5 Terminal identification 

4 5 PCB layout dimensions 

5A 7 Incandescent pushbutton types 2, 3, 4, 5, 8, or 9 

5B 8 Incandescent pushbutton types 1, 6, 7, or 0 

6 8 LED pushbutton display 

7 8 Replaceable legend plates, type 8, 9, or 0 

8 9 Incandescent lighting schematics 

9 9 Typical 5 volt LED circuit diagram 

10 9 Typical 28 volt LED circuit diagram 

11 10 LED lighting, current sourcing 

12 10 LED lighting, current sinking 

13 10 CIE chromaticity diagram, incandescent colors 

14 10 CIE chromaticity diagram, NVIS compatible colors 

15 11 Slot mounting panel cut out 

16 12 Dimensions - model 93, flush mount 

17 12 Dimensions - model 93, flush mount w/ panel seal 

18 12 Dimensions - model 93, extended mount unsealed 

19 12 Dimensions - model 93, extended mount w/ panel seal 

20 12 Dimensions - model 93, extended mount unsealed 

21 12 Dimensions - model 93, matrix mount w/ panel seal 

22 14 Model 99 switch/indicator exploded view, long crimp 

23 14 Dimensions - Model 99, flush mount 

24 14 Dimensions - Model 99, flush mount w/ panel seal 

25 15 Dimensions - Model 99, extended mount 

26 15 Dimensions - Model 99, extended mount w/ panel seal 

27 15 Switch Indicator 

28 15 Mounting screw location 

29 15 Panel cut out 

30 16 Model 99 switch/indicator exploded view, short crimp 

31 16 Dimensions - Model 99, flush mount 

32 16 Dimensions - Model 99, flush mount w/ panel seal 

33 17 Dimensions - Model 99, extended mount 

34 17 Dimensions - Model 99, extended mount w/ panel seal 

35 17 Switch/indicator assembly 

FIGURE & TABLE LISTINGS 

Table Listing 

Tbl. Pg. Description 

1 50 Terminations, circuitry and contact material 

2 51 Switch action and pushbutton retainer 

3 53 EMI/RFI and sealing 

4 53 Incandescent or LED, ground operations and EMI/RFI 

5 54 Display style and character definition 

6A 55 Incandescent lamp selection and sealing 

6B 56 LED configuration and sealing 

7 56 Display type 

8 57 Cell color 

Figure Listing 

Fig. Pg. Description 

36 17 Receptacle Assembly 

37 17 Mounting Screw Location 

38 18 Watertight seal dimensions 

39 20 Pushbutton guard for watertight seal 

40 23 Matrix assembly with direct to switch terminations 

41 23 Matrix assembly with long crimp pin terminations 

42 24 Matrix assembly with short crimp terminations 

43 25 Rear flange mount, solder or PCB termination 

44 25 Rear flange mount, crimp pin termination 

45 26 Rear flange mount, short crimp pin termination 

46 27 Rear flange mount, horizontal flanges, unsealed 

47 27 Rear flange mount, vertical flanges, unsealed 

48 27 Rear flange mount, horizontal flanges, unsealed 

49 27 Rear flange mount, four flanges, sealed or unsealed 

50 28 Front dress bezel mount, solder or PCB termination 

51 29 Front dress bezel mount, long crimp pin termination 

52 29 Front dress bezel mount, short crimp pin termination 

53 30 Front dress bezel mounting, minimum spacing 

54 30 Front dress bezel, mounting cleat assembly 

55 30 Front dress bezel, mounting cleat requirements 

56 36 LED Voltage Dimming Curve 

57 37 5 volt LED circuit schematics 

58 38 28 volt Led circuit schematics 

59 67 Ordering Systems 

60 67 Ordering Systems 

9 57 Rear flange mount dimensions and panel cutouts 

10 58 Front dress bezel mount dimensions and panel cutouts

INDIVIDUAL MOUNT SWITCH/INDICATORS 

Switch/Indicator Options 

Switches are available with SPDT or DPDT circuitry, momentary or 

alternate switch action, silver or gold contacts, EMI/RFI shielding, 

sealed or unsealed, immersion seal/high shock, and a choice of 

solder, printed circuit, or crimp pin terminations. Matching indicators 

are also available. 

Switch Schematics 

Terminals 5 & 7 are Normally Closed (NC). 

Terminals 1 & 4 are Normally Open (NO). 

Terminals 8 & 10 are Common (C). 

For indicator, omit Terminals 1, 4, 5, 7, 8 & 10. 

See Figure 8, for lamp circuit schematics. 

PC or Solder Terminals 

Figure 2 

Terminal Identification 

Figure 3 

PCB Layout Dimensions 

Terminal pattern shown above depicts switch terminal 

dimensions as viewed from rear of the switch, and shows 

all pin diameters and spacing. It is not a circuit board 

layout. When laying out the circuit board, hole sizes and 

spacing must accommodate the switch terminals and 

manufacturing tolerance conditions. Holes not required for 

omitted terminals. 

REAR VIEW OF 

SWITCH HEADER 

Figure 4 

.040 .001 DIA PIN 

(1.02 .03) 12 PLACES 

.367 

(9.32) 

.520 

(13.21) 

.138 

(3.51) 

Figure 1 

CENTERLINE 

OF HEADER 

.091 

(2.31) 


2 

11 

9 

.262 

(6.65) 

.524 

(13.31) 

.360 

(9.14) 

.164 

(4.17) 

5 

1 

4 

8 10 

6 

.152 

(3.86) 

7 3 

.325 

(8.26) .428 

(10.87) 

12 

CENTERLINE 

OF HEADER 

.513 

(13.03) 

.260 

(6.60) 

5

6 

SERIES 90 DISPLAY PUSHBUTTON 

LED or Incandescent Illumination 

Incandescent display pushbuttons accept four T-1 midget flange based 

lamps that may be easily serviced from the front mounting panel. The 

display pushbutton is also available with a serviceable High Bright LED 

light plate, which provide an extended service life. Low power consumption 

of the LEDs, as well as the heat sink capabilities of the switch/ 

indicator assembly, result in a pushbutton that is cool to the touch. 

Standard Lighted Display 

INCANDESCENT LED 

Ten Display Types Seven Display Types 

Eight Standard Colors Six Standard Colors 

Four NVG Colors Seven NVG Colors 

Eight Display Styles Eight Display Styles 

Five Legend Heights Five Legend Heights 

There are ten display types offering a combination of legend characters 

or background illumination color. LED configurations are available 

in seven types. Designer matched colors enhance display appearance 

and contribute to increased operator attention and efficiency. 

Graphic designs and custom legend heights in these ten display types 

are available. Display styles include full-screen displays, two-way, three-way and four-way split screen displays. 

Each of these sections may have its own color and be lighted independently of the others. 

Night Vision Goggle Compatibility 

Display certification of Night Vision Imaging System (NVIS) compatibility per the requirements of MIL- 

STD-3009. Unique lighting capabilities of the Series 90 provide display 

legends that are fully qualified for both Type I Class A and Type II Class B 

night vision goggles. Legends with incandescent lighting are available in 

four colors, NVIS Green A, NVIS Green B, NVIS Yellow, and NVIS Red, 

all qualified to MIL-STD-3009. LED based units provide NVG compatibility 

with NVIS Green B, NVIS Yellow and NVIS Red NVIS Blue and 

NVIS White. Trimmed to low level for night operations, the legends are 

sharp and clear with no glare or hot spots, and are not detrimental to 

darkness adaptation for unaided eye visual monitoring outside the crew 

station. For incandescent configurations and white LED-based pushbuttons, 

sunlight readable legends and NVG compatibility are combined in 

the same pushbutton display.

Sunlight Readable Display 


Illuminated sunlight readable legend is clearly legible in 10,000 footcandle ambient light. When not lighted, the 

legend is not readable when viewed in the same ambient light. 

Staco Systems's sunlight readable displays are clearly legible in direct sunlight eliminating the problem of loss of 

legend legibility due to reflection of bright ambient light ... the equivalent of direct sunlight at 70,000 feet altitude. 

When the display’s dead-front face is unlit, the legend is indiscernible. The display has a viewing angle of an 

80°cone perpendicular to the viewing surface. All lighting measurements are made in Staco Systems'’s in-plant Mil 

certified light laboratory. Certification is performed photometrically per the exacting requirements of MIL-S-22885. 

Typical Pushbutton Display 

Choice of seven factory installed Display Types or three customer 

assembled and installed Display Types. (See Table 7). All are available 

with choice of eight Display Styles (Table 5 ). A color filter, in a choice of 

eight designer proven colors (Table 8), goes over each of the four lamps. 

Display Type Codes 2, 3, 4, 5, 8 or 9 

Configuration shown applies to Type Codes 2, 3, 4, 5, 8 or 9 

Figure 5A 


7

8 


Display Type Codes 1, 6, 7, or 0 

Configuration shown applies to Type Codes 1, 6, 7,or 0 

Figure 5B 

Typical LED Pushbutton Display 

Figure 6 

Replaceable Legend Plates 

For those applications where the customer wishes 

to provide or replace legend plates, an alternative 

assembly is available in three display styles for use 

only with the T-1 flange based lamp pushbutton. 

These are similar to factory installed Type 2, Type 5 

and Type 6 Displays. 

Display Types 8, 9 and 0, consisting of a customer 

supplied legend plate stacked between the factory 

supplied face screen and diffuser plate, may be substituted 

for the standard bonded face plate assembly 

in the T-1 lamp pushbuttons. Display Types 9 and 

0 replaceable legends are available for LED pushbuttons. 

(See Table 7). The usable legend area is 

.520” square. Overall size of the face screen is 

.575” square with a viewing area of .495” square. 

Customer installed legends may not be of equal quality 

as compared to the laminated factory installed 

assemblies. 

SERVICEABLE LED LAMP MODULE 

Figure 7

Incandescent Lamp Grounds 

Three types of incandescent lamp circuits are available. The schematics 

are shown in Figure 8 and the ordering codes in Table 4. 

The “Common Lamp Ground” configuration is used when the power 

for the display is from a single power bus. “Vertically Split” and 

“Horizontally Split” Lamp Grounds allow the use of two power sources 

to illuminate the display of a given pushbutton. It should be noted 

that the specific lamp circuit option which is utilized is totally independent 

of the display style (i.e., full screen, 2-way, 3-way or 4-way 

splits) of Table 5. 


Typical 5 Volt LED Circuit Diagram 

Single Common 

Circuit Rear View 

Figure 9 

LED Lighting 

Split Common 


Single Common 


Figure 10 

Front View Front View 


COMMON LAMP GROUND 

VERTICAL SPLIT LAMP GROUND 

HORIZONTAL SPLIT LAMP GROUND 

Split Common 


LED displays may be configured as either “current sourcing” or “ 

current sinking.” Simplified control circuits for each are shown in Figures 11 and 12. Application information is provided 

in the Product Design and Engineering Data section. Brightness control and schematics for all 5 and 28 volt 

LED display pushbuttons are also provided there. Voltage dimming is an option with 28 volt versions. 

Figure 8 

Typical 28 Volt LED Circuit Diagram 

9

Display Pushbutton Colors 


LED LIGHTING CONTROLS 

Typical Current Sourcing Application 

Figure 11 Figure 12 

Colors are described by the international standard method of coordinates on CIE chromaticity diagrams. Figure 

13 represents the colors available for Series 90 incandescent configurations plotted in terms of x-y coordinate 

areas on the 1931 CIE chart. These colors include the seven colors of MIL-S-22885/101C (red, aviation yellow, 

white, lunar white, blue and aviation green) plus lemon yellow. 

Night Vision Imaging System colors are plotted in the U’-V’ coordinates of 1976 CIE chart of figure 14. All four of 

the colors defined in MIL-STD-3009 are available in incandescent displays. LED applications may use green B, 

yellow and red. When ordering, colors are selected from Table 8. 

10 

Typical Current Sinking Application 

Figure 13 – Incandescent colors Figure 14 – NVIS Compatible colors

Mounting Procedure 


1. Remove pushbutton from switch/indicator assembly by pulling straight out. Use tool # 15190 for easier removal. 

2. Rotate locking screws inside front of switch/indicator assembly counter clockwise with a small screwdriver. 

This will release mounting cams. 

3. Slide mounting sleeve and panel spacer off of the switch/indicator assembly. 

4. Install switch/indicator assembly through panel cut-out from front of panel. Assembly is marked with word “TOP” 

to help properly orient position of the assembly in the panel. 

5. Replace panel spacer and mounting sleeve. 

6. Rotate locking screws clockwise to bring mounting cams to lock position. Recommended mounting torque is 10±2 

oz. in. (0.071+ 0.014Nm). 

7. Be certain that pushbutton has lamps or dummy lamps installed in all four positions before inserting into mating 

switch/indicator assembly. 

8. To Insert the pushbutton properly, be sure that the index post is at the top and that the pushbutton is held square 

to the switch housing. 

9. The two panel spacers, together with the mounting sleeve, provide various options for fitting the switch/ indicator 

assembly to mounting panels with thicknesses ranging from essentially zero to a maximum of about .75” (see 

dimensional drawings for exact thickness for each configuration). 

10. For extended mounting of the assembly, as in conjunction with edge-lit panels, the black panel spacer is left 

installed on the assembly before it is inserted in the panel cut-out so as to be in front of the panel when 

installation is complete. 

11. On sealed switch/indicator assemblies mounted flush, the panel seal is installed under the housing flange and on 

the front of the panel. On the extended mount sealed units, the panel seal is place between the panel spacer 

and the front the panel. (Refer to dimensional drawings.) 

Slot Mounting Panel Cut Out 

Mounting Cam 

Mounting Sleeve 

HORIZONTAL OR VERTICAL SLOT CUT-OUT FOR MODEL 93 OR 

MODEL 99 SWITCH/INDICATOR WITH PUSHBUTTON ASSEMBLY 

For those applications where horizontal or vertical slot 

mounting of two or more individual mount switch/indicators 

is required, the formula above provides cut-out dimensions 

for the slot. 

L = Length of horizontal mounting slot (or height of vertical) 

n = Number of units in a row 

Panel Spacers 

Index Post 

Pushbutton Assembly with Lamps 


Figure 15 

11

Flush Mount Unsealed 

Extended Mount Unsealed 

Matrix Mount Unsealed 

12 

DIMENSIONS – MODEL 93 

Flush Mount With Panel Seal 


Extended Mount With Panel Seal 


Matrix Mount With Panel Seal 

Figure 20 Figure 21

Crimp Pin Termination 

MODEL 99 SWITCH/INDICATOR 

Reduced wiring time with increased reliability - Staco Systems's Model 

98 Switch/Indicator and the Model 99 Switch/Indicator and Display 

Pushbutton, offer individually mounted units with crimp pin termination 

receptacles. These units provide the advantage of fast and easy wiring 

as well as quick and simple post installation maintenance. The crimp 

pin terminals and the termination receptacle, may be removed from 

switch/indicator. All soldering is eliminated, greatly reducing installation 

time. Termination receptacles may also be prewired for connection after 

switch/indicator assemblies have been installed. The crimp pin terminals 

and associated installation tools are all military standard parts to assure 

wide availability and high reliability. 

Connecting wires, with socket contact crimp pins, are shown inserted in the switch/indicator termination recep- 

tacle. Wires can be removed and replaced individually, or the termination receptacle, with all wires left in place, 

can be removed and replaced as a single unit. 

Switch/Indicator Options 

Model 98 and 99 assemblies with crimp pin termination receptacles are available with SPDT or DPDT circuitry, 

momentary or alternate switch action, silver or gold contacts, EMI/RFI shielding, with or without moisture sealing 

and with the optional Immersion Seal/High Impact Seal/Solvent Resistant Seal. Matching Indicators are also 

available. 

Display Pushbutton Options 

Model 92 lighted display pushbutton is used with both the Model 93 and Model 99 Switch/Indicator with 

Pushbutton assembly. The same illumination and display options are available for both the Model 93 and Model 

99 Assemblies. 

Assembly 

Model 99 assembly is comprised of a termination receptacle, a switch/indicator body, and a display pushbutton. 

The termination receptacle and/or individual wires and the pushbutton can be removed for servicing and 

replaced without disturbing the switch/indicator installed in a control panel. 


13

14 

MODEL 99 SWITCH/INDICATOR - LONG CRIMP PIN 

Exploded View 

Figure 22 

DIMENSIONS – MODEL 99 - LONG CRIMP PIN 

Flush Mount Unsealed Flush Mount With Panel Seal 

Figure 23 

Figure 24

DIMENSIONS – MODEL 99 - LONG CRIMP PIN 


Switch/Indicator Assembly 

Model 9816 through 9820 assembly 

Receptacle 

Assembly 

(MIL-C-39029/16-168) 



Figure 27 

Figure 29 

Panel Cut Out 

Mounting Screw Location 

VIEW FROM FRONT OF PANEL 

Figure 28 

Visit www.stacosystems.com or call 714-549-3041 for more information 15

16 

MODEL 99 SWITCH/INDICATOR - SHORT CRIMP PIN 

Exploded View 

Flush Mount Unsealed Flush Mount With Panel Seal 

Figure 31 

Figure 30 

DIMENSIONS – MODEL 99 - SHORT CRIMP PIN 

Figure 32

DIMENSIONS - MODEL 99 - SHORT CRIMP PIN 


Switch/Indicator Assembly 

Model 9821 through 9825 assembly 

Figure 37 



Figure 35 

Mounting Screw Location 

(18.92) 

Receptacle Assembly 

(MIL-C-39029/22-192) 

Figure 36 


VIEW FROM FRONT 

OF PANEL 

17

WATERTIGHT SEAL 

The Watertight Seal is part of the Staco Systems Series 90 fam- 

ily of illuminated pushbutton switches and indicators. It is covered 

by MIL-S-22885/112. Assemblies incorporating this seal can be 

ordered as an option to the Series 90. 

This Watertight Seal is a flexible elastomeric boot which is an inte- 

gral part of the pushbutton and provides a seal at the front panel. 

The flexible nature of the seal allows actuation of the switch under 

three feet of water while still sealing against leakage through the 

switch or panel opening. 

This same seal performs as a Splashproof Seal to protect against 

washdowns using directed streams of water. 

The seal is intended to protect the switch/indicator, as well as the behind-the-panel areas, against elements such 

as rain, fog, snow, salt spray, sand and dust. 

The watertight seal also insures that the pushbutton remains attached to the switch under high impact shock con- 

ditions (approximately 1,500 Gs). The combination of pushbutton with watertight seal will remain attached to the 

switch when tested per MIL-S-901 for Class I and Class II equipment. 

Panel Spacing of switches or indicators with watertight seals installed is 1.06 inches (26.9 mm) minimum center 

to center horizontally or vertically. If the Pushbutton Guard (Assembly 15204/005) is to be installed, the minimum 

horizontal center to center spacing is 1.40 inches (35.6 mm). 

Dimensions 

18 

Figure 38

Watertight Seal Specifications 


When properly assembled and installed the Watertight Seal 

will perform to the following requirements. 

Temperature Storage 65°C to +95°C; 

Operating 55°C to +85°C 

Thermal Shock -55°C to +85°C per MIL-STD-202, Method 107, 

Test Condition A 

Vibration 15 Gs, 10 to 2 kHz per MIL-STD-202, Method 204, 

Test Condition B 

Shock, Standard 75 G’s per MIL-STD-202, Method 213 Test Condition B 

Shock, High Impact Per MIL-S-901, Class II - no damage or contact transfers. 

Per MIL-S-901, Class I - no damage and no parts come 

adrift but electrical contacts may transfer until reactuated. 

Splashproof, Sealed Per MIL-S-22885, para. 4.8.20.1,and MIL-STD-108, 

para. 4.9 when Watertight Seal installed. 

Watertight, Sealed Per MIL-S-22885, para. 4.8.20.2, and MIL-STD-108, para. 4.13 

(3 feet of water, 1.3 psi) when Watertight Seal installed. 

Dripproof, Sealed Per MIL-S-22885, para. 4.8.20.3, and MIL-STD-108, 

para. 4.3, when Watertight Seal installed. 

Salt Spray Per MIL-STD-202, Method 101, Test Condition B. 

No evidence of excessive corrosion. 

Sand and Dust Per MIL-STD-202, Method 110, 

Test Condition B and MIL-S-22885. 

Solvent Resistant Seal 

The Solvent Resistant Seal is identical to the watertight seal except that it is made of materials resistant to petroleum 

based products and solvents. The seal is intended to protect the switch/indicator, as well as the behind-thepanel 

areas, against petroleum based products and solvents in factory, flightline or refinery environments. 

The Solvent Resistant Seal material and the pushbutton faceplate protective coating are resistant to the following substances: 

Motor Oil (multipurpose) Transmission Fluid 

Petroleum Oil (crude) Silicone Greases 

Unleaded Gasoline Animal Fats 

Diesel Fuel Prestone Antifreeze 

JP-4 Denatured Alcohol 

JP-5 Mineral Oil 

Methanol Linseed Oil 

Water Soap Solutions 

Ethanol 

Hydrochloric Acid 10% 

Sodium Hydroxide 10% 

Ammonium Hydroxide 10% 

Kerosene 

Isopropyl Alcohol 

Sea water 

Detergent Solutions 

Solvent Resistant Seals can be ordered by adding /006 to the coded part number (see ordering information; the 

/005 would be replaced by the /006). 


19

Hazardous Environment Seal 


For switches or indicators intended for use in a nuclear, biological or chemical warfare (NBC) environment, 

please consult the factory. Hazardous Environmental Seals can be ordered by adding /007 to the coded part 

number. 

Pushbutton Guard For Watertight Seal 

The pushbutton guard is for application with the Watertight Seal or Solvent Resistant Seal. For application with 

unsealed or dripproof sealed configurations, see the Accessories section. 

Pushbutton Guard is transparent and spring loaded. 

Lift to allow switch actuation. 

Prevents accidental operation. 

Slips over switch housing upon installation. 

Minimal panel spacing is 1.40” (35.6 mm). 

See the Accessories section for Pushbutton Guards for general purpose applications which do not use 

watertight seals. 

20 

PART NUMBER APPLICATION 

15204/005 Watertight Seal 

15204/006 Solvent Resistant Seal 

15204/007 

Figure 39 

NBC Resistant Seal

MATRIX HOUSING ASSEMBLIES 

Series 90 Matrix Housing Assemblies 

Matrix Housings are available in two different 

mounting configurations and any 

matrix arrangement to meet the customer’s 

required number of stations. Constructed of 

square aluminum alloy tubes, the lightweight, 

yet rugged assembly actually strengthens 

the panel, regardless of cutout size. Matrix 

Housings are constructed to meet the 

requirements of MIL-S-24317. Installation 

time is greatly reduced, requiring only one 

panel cutout instead of many. For non-EMI/ 

RFI applications, a black anodized finish per 

MIL-A-8625 is applied to the housing. For 

EMI/RFI shielded applications, a chemical 

film finish, per MIL-C-5541, is applied. Series 

90 Switches and Indicators are inserted in 

the front of the matrix and locked in place by 

rotating the screw actuated locking cams. 

Termination Options 

Solder, PCB, and crimp pin terminations are available. Model 94 and 96 Matrix Housings for solder and printed 

circuit terminations provide for direct connection of wires to the switch/indicator terminals. Model 95 and 97 

Matrix Housings, for crimp pin connections, are lengthened to accommodate a crimp pin receptacle. The 

mounted receptacle mates with a standard crimp pin switch/indicator, enabling the crimp pin socket contact to 

make electrical connection to the switch/indicator terminals. The crimp pin matrix assembly allows the switch 

to be removed from the front of the housing, leaving the receptacle and wiring in place. The receptacle can 

also be removed from the rear of the housing, leaving the switch in place, or the wire may be removed from the 

receptacle without disturbing the receptacle or switch/indicator assembly. 

Rear Flange Mount Matrix Housings 

Model 94 and 95 Matrix Housings for rear mounting of the assembly to the customer’s control panel are available 

with flanges having slotted mounting holes. Flanges may be located horizontally on the top and bottom 

of the housing, vertically on the two sides, or on all four sides for applications where extreme vibration may 

be encountered or for EMI/RFI shielding to assure complete panel contact for grounding. All units conform to 

shock requirements of MIL-STD-202, Method 213, condition B. 

Flange set-back is custom made to accommodate customer’s desired panel thickness. Flange set-back, dimension “H” 

shown on housing drawings, measured from the pushbutton top to front of the mounting flange is variable, depending on 

panel thickness and desired pushbutton extension, and must be specified by customer in the part number rationale. See 

ordering information. The matrix housing is shipped fully assembled, ready to be installed in the customer’s control panel. 


21

MATRIX HOUSING ASSEMBLIES 

Front Dress Bezel Mount Matrix Housings 

Models 96 and 97 Matrix Housings are supplied with attractive extruded aluminum dress bezel. The entire 

assembly mounts from the front of the customer’s control panel through a single panel cutout. Mounting 

cleats, inserted in a groove on the rear of the dress bezel and self-locking screws, tightened against the rear 

panel, securely fasten the matrix housing assembly in place. No mounting hardware is visible from the front 

panel. The required number of mounting cleats, with self locking screws, are supplied with the fully assembled 

housing. Additional cleat assemblies, packaged 5 per bag, may be ordered separately as Part number 15098. 

Model 95 and 97 Matrix Housing and 

Crimp Pin Termination Receptacles 

Crimp pin receptacles are supplied installed in the Model 95 and 

97 Matrix Housings. Locking cams, actuated by screws in the rear 

of the receptacle securely lock the receptacle into the housing. 

Model 95 Switch Indicator 

Easily inserted or removed from front of panel using 

only a small screwdriver to tighten or loosen the 

screw actuated locking cams on each side. 

Model 92 Display Pushbutton 

Up to four lighted message areas. Accepts 

four T-1 flange based lamps. Also available 

with integral LED lighted areas. 

Model 94 Matrix Housing With Rear Mount Flanges 

Flange set-back is custom made to fit desired 

panel thicknesses. Housing accepts switch/indicator 

assemblies with solder, or printed circuit terminations. 

Switch/indicators are securely held in place by screw 

actuated locking cams. Switch/indicator terminations 

protrude from rear of the matrix housing. 

Locking Cams 

22 

MATRIX MOUNTING 

Actuated by screws (2) in front of switch/indicator assembly. Locking cams securely 

hold receptacle in the matrix housing frame. Recommended mounting torque 10 ± 2 

oz. in. (0.071 ± 0.014 Nm). 

Locking Cams 

Actuated by screws (2) in rear of receptacle. 

Locking cams securely hold receptacle in the 

matrix housing frame. Recommended mounting 

torque 10 ± 2 oz. in. (0.071 ± 0.014 Nm). 

Locking Cams 

Actuated by screws (2) in front of switch/indicator 

assembly. Locking cams securely hold receptacle 

in the matrix housing frame. Recommended 

mounting torque 10 ± 2 oz. in. (0.071 ± 0.014 Nm). 

Model 91 Switch Indicator 

Easily inserted or removed from front of 

panel using only a small screwdriver to 

tighten or loosen the screw actuated locking 

cams. Wires are connected directly 

to the switch/indicator terminations. Unit 

shown has solder terminations. 

Model 92 Display Pushbutton 

Up to four lighted message areas. Accepts 

four T-1 flange based lamps. Also available 

with integral LED lighted areas.

MATRIX ASSEMBLY 

Matrix Assembly With Direct To Switch Terminations 

Model 96 Front Dress Bezel Mount with Short Housing 

(Model 97 is Dress Bezel with Long Housing and Crimp Terminations) 

Figure 40 

Matrix Assembly With Crimp Pin Terminations 

Long Crimp Pin 

Model 95 Rear Flange Mount with Long Housing and Crimp Terminations 

(Model 94 is Flange Mount with Short Housing) 

Figure 41 

FEMALE 

OR 15280 


23

Short Crimp Pin 

CRIMP CONTACT, 15276 

MIL-C-39029/22-192 

24 



Matrix Assembly With Crimp Pin Terminations 

Figure 42

DIMENSIONS REAR FLANGE - MODEL MOUNT99 

Rear Flange Mount – Solder or PCB Termination 

Model 94 

Rear Flange Mount – Crimp Pin Terminations 

Model 95 

1 

Figure 43 

Figure 44 


NOTES: 

1 

Flange set-back 

(Dimension “H”) is the distance 

from the face of the 

pushbutton to the surface 

of the mounting flange. for 

an unsealed unit,, only the 

panel thickness and relationship 

of pushbutton to 

front panel need be considered. 

for a sealed unit, the 

thickness of the switch and 

panel seal also need to be 

considered. 

NOTES: 

1 


(Dimension “H”) is the distance 

from the face of the 

pushbutton to the surface 

of the mounting flange. for 

an unsealed unit,, only the 

panel thickness and relationship 

of pushbutton to 

front panel need be considered. 

for a sealed unit, the 

thickness of the switch and 

panel seal also need to be 

considered. 

25

26 

REAR FLANGE MOUNT 

Rear Flange Mount – Short Crimp Pin Terminations 

Model 95 

NOTES: 

1 

Figure 45 


(Dimension “H”) is the distance from the face of the pushbutton to the surface of the mounting 

flange. for an unsealed unit,, only the panel thickness and relationship of pushbutton to front 

panel need be considered. for a sealed unit, the thickness of the switch and panel seal also 

need to be considered.

FLANGE OPTION CODES 

Rear Flange Mount Matrix Housing 

Horizontal Flanges, Unsealed 

Horizontal Flange Unsealed 

Dripproof Seals 

Figure 46 

Flange Option Code 2; Station Configuration 0302 

Figure 48 


Matrix housings may be ordered with a sealed option 

for either the dress bezel front mounting or the 

four-flange rear mounting configuration. 

When either of these matrix housing assemblies are panel 

mounted using a customer-furnished panel seal gasket 

and all matrix stations are loaded with switches or indicators 

utilizing switch and pushbutton seals, the matrix 

assembly is classified as dripproof. Behind the panel 

equipment will be protected and the switches and indicators 

will operate in the presence of a coarse liquid spray 

directed at it. Mounted as described, the unit may be 

subjected to the dripproof test of MIL-STD-108, 15 degree 

method, with a five gallon quantity of water flowing over 

the specimen for a period of five minutes duration. 

Vertical Flanges, Unsealed 

Four Flanges, Sealed or Unsealed 

Flange Option Codes 

CODE DESCRIPTION 

1 No flanges (unsealed) 


2 Horizontal flanges only (unsealed) 

3 Vertical flanges only (unsealed) 

6 Four flange (sealed) 

Model 94 or 95 

Figure 47 


Figure 49 

Flange Option Code 6 or 7; Station Configuration 0304 

7 Four flange (unsealed) 

27

Solder or PCB Termination 

Model 96 or 97 

Model 96 

28 

Figure 50 

FRONT DRESS BEZEL MOUNT

Crimp Pin Termination 

Long Crimp Pin 

Model 97 

Figure 51 

Short Crimp Pin 

Figure 52 

FRONT DRESS BEZEL MOUNT 

10) 


29

30 

FRONT DRESS BEZEL MOUNTING INFORMATION 

Minimum Spacing 

Mounting Cleat Assembly and Requirements 

Figure 54 

Figure 53 

Figure 55

PRODUCT DIMENSIONS DESIGN & ENGINEERING - MODEL 99 DATA 

General Information 

Staco Systems products are designed and manufactured to meet specifications of Original Equipment 

Manufacturers who demand dependability, attractive appearance, and maximum value from their products. 

Combining imaginative engineering with manufacturing know-how. 

Military Specs And Standards 

Staco Systems Series 90 Switches, Indicators and Display Pushbuttons are manufactured to meet or exceed the 

requirements of the following specifications and standards where applicable. 

Military Specifications 

MIL-PRF-22885 Switches, Pushbutton, Illuminated, General Specification for. 

MIL-PRF-22885/101 Switch, Pushbutton, Matrix or Individually Mounted, Illuminated, 4-Lamp, SPDT and DPDT, 5.0 

Amperes, Silver contacts, 1 Ampere, Gold Contacts (Dripproof, Sunlight Readable, 

EMI/RFI Shielded). 

MIL-PRF-22885/112 Switches, Pushbutton, White Light Emitting Diode (LED) Illuminated, Standard, Night Vision 

Imaging System (NVIS) and Sunlight Readable Displays, Dimmable SPDT and DPDT, 

Low Level to 7 Amperes, Sealed and Unsealed, Solder and Common Termination 

System (CTS) Terminations. 

MIL-S-24317 Switch Matrix Frame, Multistation. 

MIL-S-901 Shock Tests, H.I. (High-Impact),Shipboard Machinery, Equipment and Systems, Requirements for. 

Military Standards 

MIL-STD-3009 Lighting, Aircraft, Interior, Night Vision Imaging System (NVIS) Compatible. 

MIL-STD-108 Definitions of, and Basic requirements for, Enclosures for Electric and Electronic Equipment. 

MIL-STD-202 Test Methods For Electronic and Electrical Component Parts. 

Other Military Specifications 

DSCC DWG Switch, Pushbutton, Illuminated, 4 Lamp 90020 (MIL-S-22885/101 w/Legend). 


31

32 

PRODUCT MODEL DESIGN 99 SWITCH/INDICATOR 

& ENGINEERING DATA 

Environmental Specifications 

Temperature Range Operating -55°C to +85°C 

Storage -65°C to +95°C 

Thermal Shock MIL-STD-202, Method 107, Test Condition A (-55°C to +85°C) 

Vibration MIL-PRF-22885 vibration grade 3 (10-2,000 Hz) MIL-STD-202, Method 204, Test Condition B 

(15 G peak) 

Shock MIL-STD-202, Method 213, Condition B (75G) 

Shock - High Impact MIL-S-901, Grade A, Class II (for deck-mounted equipment; hull-mounting not 

recommended). Moisture Resistance MIL-STD-202, Method 106, (wet 10 megohms, dry 

1,000 megohms). 

Dripproof Seal MIL-PRF-22885 Symbol 2 option, test procedures of MIL-STD-108 (5 gal/min). 

Splashproof Seal MIL-PRF-22885 Symbol 4 option, test procedures of MIL-STD-108 (15 gal/min). 

Watertight Seal MIL-PRF-22885 Symbol 3 option, test procedures of MIL-STD-108 (3 foot submersion, 

1 hour). 

Solvent Resistant Option is splashproof and water tight plus seal is resistant to most petroleum-based 

fuels, solvents, oils, and greases. 

Salt Spray MIL-STD-202, Method 101, Test Condition A, (Corrosion, 96 hours). 

Explosion MIL-STD-202, Method 109. 

Sand and Dust MIL-STD-202, Method 110, Condition B and MIL-S-22885. (Applies to switches equipped 

with seals for Dripproof, Splashproof, Watertight or Solvent Resistant options.) 

Dripproof Seal of Matrix Systems 

When matrix housing assemblies are mounted to the panel using a customer furnished panel seal gasket and 

all matrix stations are loaded with switch/indicators utilizing switch and pushbutton seals, the matrix assembly 

will be dripproof. All behind the panel equipment will be protected and the enclosed switch/indicators will operate 

satisfactorily in the presence of a coarse spray of liquid directed at it or its mounting surface. With the 

matrix assembly mounted as described, the unit may be subjected to the dripproof test of MIL-STD-108 (five 

gallons of water flowing over the specimen for a period of five minutes). 

Other Matrix Seals 

Splashproof seals, watertight seals and solvent resistant seals are not available for matrix configurations.


Electrical Specifications 

Switch Contact Ratings 

Power Circuits (silver contacts) 

250 VAC 

UL listed L7 7 Amps, (21 SK83-H 340). 

Low level Circuits (gold contacts) Typical application 

would be 30 milliamps at 30 millivolts 

Switch Contact Resistance 

New: < 25 milliohms 

End of life: Per MIL-S-22885 (typical < 40 milliohms) 

At reduced barometric pressure: 

per MIL-STD-202, Method 105, test potential 

400 Vrms; test condition C (maximum pressure 

of 1.31”Hg or 33.00 mm Hg to simulate an 

altitude of 70,000 feet or 21,336 meters). 

Switch Schematics 

Single-pole double-throw (SPDT) and double-pole double-throw (DPDT) switch circuits are shown schematically in Figure 1. 

Mechanical 

Physical Dimensions 

In this document, all dimensions are shown in inches with millimeters given as reference information. Unless other- 

wise specified, tolerances are: 

.xx = ± .02 inch (± .5 mm) 

.xxx = ± .010 inch (± .25 mm) 

Resistive 

Indicators .030 inch (.76 mm) 

Latchdown Actuation and Displacement 

On alternate action (maintained) contact switches, the pushbutton is retained in a latch-down or actuated switch position until 

the pushbutton is depressed a second time, releasing the pushbutton and deactivating the switch. When in the actuated 

position, the face of the pushbutton is mechanically held depressed from its normal height by approximately .080 inch (2.03 mm). 

Actuation Force 

The force required to actuate momentary and maintained switches ranges from 1.1 lbs. for unsealed, SPDT, to 2.2 

lbs. sealed, DPDT (4.9 tp 9.8N). Add an additional 0.6 lbs. (2.7N) for immersion seal configuration. 

Pushbutton Extraction Force 

Per MIL-S-22885/101, the extraction force is between 2 to 5 lbs. (9 to 22N). 

Pushbutton Retainer 

As an option, a pushbutton retainer tie is available to keep a given pushbutton physically linked to a given switch 

during relamping operations. 


Altitude 28 VDC 115 VAC 

(Feet) (Amps) 60 HZ (Amps) 

Sea Level 7 7 

50,000’ 4 – 

Inductive Sea Level 4 7 

50,000’ 2.5 – 

Lamp Sea Level 2.5 2 

50,000’ 2.5 – 

Switch Operational Life 

Typical application would be 30 Milliamps at 30 

Millivolts 

Dielectric Strength 

At atmospheric pressure: 

Pushbutton Actuation Travel 

Per MIL-STD-202, Method 1,000 Vrms. 

Switches .12 inch (3.0 mm) 

33

Weights 

34 



Solder Terminals 

Solder terminals are double turret to ensure that wires can be mechanically secured prior to soldering and are 

tin-lead plated per MIL-P-81728. Solderability testing is in accordance with MIL-STD-202, Method 208. Terminal 

strength tests are conducted as prescribed by MIL-STD-202, Method 211, test condition A. 

Printed Circuit Terminals 

Printed circuit terminals are plated to facilitate hand, wave or flow soldering methods. 

Crimp Pin Terminals 

Crimp pin terminals are gold plated per MIL-G-45204. NOTE: crimp pin terminals mate with crimp-on wire terminations 

per MIL-C-39029/16-168 and MIL-C-39029/22-192. 

EMI/RFI Shielding 

When tested per MIL-S-22885 shielding efficiency method, the minimum shielding attenuation is at least 60 dB 

over the frequency range from 100 to 1,000 MHz. 

The typical weights of the switch or indicator, including mounting hardware of .07 oz., (2 gms) and the pushbutton are: 

SWITCH/INDICATOR WITH PUSHBUTTON WEIGHT 

Assembly Ounces Grams 

Mdl 93 Switch (DPDT w/PB & 4 lamps/LEDs) .061 17 

Mdl 93 Switch (SPDT w/PB & 4 lamps/LEDs) .058 16 

Mdl 93 Indicator (w/PB & 4 lamps/LEDs) 0.5 14 

Mdl 99 Switch (DPDT w/PB & 4 lamps/LEDs) 1.09 31 

Mdl 99 Switch (DPDT w/PB & 4 lamps/LEDs) 1.06 30 

Mdl 99 Indicator (w/PB & 4 lamps/LEDs) .98 28 

Pushbutton (w/4 lamps/LEDs 0.13 4 

Additional weight for watertight seals 0.08 2 

Matrix Weight Per Station 

Front Mount 

Rear Flange Mount Dress Bezel 

Components Termination Termination 

Solder/PC Crimp Pin Solder/PC Crimp Pin 

1. Matrix Housing .140 oz. .205 oz. .140 oz. .205 oz. 

2. Receptacle 

Assy. 

3. Flange 

(per inch) w/rivets 

4. Dress Bezel 

(per lin. inch) 

– .315 oz. – .315 oz. 

.075 oz. .075 oz. – – 

– – .162 oz. .162 oz. 

5. Contact Socket 

(12 max per – .006 oz. ea. – .006 oz. ea. 

station) 

6. Cleat Assy. 

(2 to 10 req.) 

– – .146 oz. .146 oz. 

Matrix Housing Weight Examples 

Rear flange mount matrix, 4x3, with 4 flanges, 

crimp pin, and 12 pins utilized 

Housings 12 @ 0.205 oz. 2.460 oz. 

Receptacle Assy 3.780 oz. 

Flange 13.61 inches @ .075 oz./in. 1.021 oz. 

Socket contacts 12 x 12 @ .006 oz. 0.864 oz. 

Matrix housing total 8.125 oz. 

Front dress bezel mount matrix, 2x2, w/solder 

termination 

Housings 4 @ 0.140 oz. 0.560 oz. 

Dress bezel 7.97 inches @ .1621 .291 oz. 

Cleat assy 2 @ 0.146 0.292 oz. 

Matrix housing total 2.143 oz. 

Matrix System Total Weight 

To obtain matrix system total weight, include 

matrix housing, plus switch or indicator weights 

with pushbuttons, less individual mounting hard- 

ware weights of .07 oz., (2 gms) per station.


Display System 

Field of View 

The visibility of any legend, symbology or alphanumerics can be viewed from a distance of three feet, without any restrictions 

by the periphery of the enclosure for the display, at all angles within an 80 o cone perpendicular to the viewing surface. 

Light Sources 

Two means for legend lighting are available in the Series 90 

product line, either incandescent or LED. 

Incandescent Lamps 

Lamps are flange based, incandescent, T-1 sub-midget type, 

which are field replaceable from the front panel. Selection options 

are specified in Table 6A. When lamps are not furnished with 

the pushbuttons, a removable fiberboard plate will be installed 

at the factory. This plate is removed and discarded when lamps 

are installed in the field. For proper operation, either this “discard” 

plate, four T-1 lamps, or a combination of lamps and “dummy 

plugs” (devices which simulate the specified lamps) must be used to prevent damage to the unit. 

Factory-supplied lamps have nominal brightness as specified by the manufacturer in Table 6A. These have a mean spherical 

candle power (MSCP) tolerance of ± 25%. Unless otherwise specified, all brightness tests performed at the factory, and those 

published in this document utilize calibrated lamps with a luminous intensity of .15 ± .01 MSCP. 

Light Emitting Diodes (LEDs) 

The voltage options are 5 or 28 volts. LED polarity and other options are as specified in Table 6B. These LEDs 

are a serviceable part of the pushbutton. 

Incandescent Lighting Circuits 

Electrical connections for pushbuttons lighted with incandescent lamps are shown in Figure 8. The lamp circuit is 

optionally available with: 

a) Common lamp ground for all four lamps (full ground plate); b) Vertically split ground plate (the two lamps on 

the left half and the two lamps on the right half may be on separate power circuits with separate grounding); 

c) Horizontally split ground plate (lighting for the top half and the bottom half may be on separate power circuits). 

The choice of lamp circuit grounding scheme is completely independent of the selection of legend display style (full screen 

display, two-way horizontal split, etc., as shown in Table 5). The split grounds allow the lamps of a display to be powered from 

two separate power sources. 

Each incandescent lamp is lighted independently from the other three by applying power to the pin designated in the schematic. 

The power may be dc or low-voltage ac, within the rating of the lamp. Standard lamp selections are listed in Table 6A. 

Incandescent-based displays are available in the colors indicated in the chromaticity diagram of Figure 13. 

LED Lighting Circuits 


Legend Viewing Dimensions 

The display area available for legends: 

Viewing Area Nominal Dimensions 

Inch (mm) 

Full Screen .495” (12.57) square 

Half Screen, horizontal .495 x .217” (12.57 x 5.51) 

Half Screen, vertical .217 x .495” (5.51 x 12.57) 

Quarter Screen .217” (5.51) square 

Light emitting diode (LED) arrays within the Series 90 pushbuttons are available as an alternative to incandescent lamps. 

Each of the four quadrants of a display is lighted using an assembly of three LED chips, giving a total of 12 LED junctions per 

pushbutton. Schematics for typical LED configurations are shown in Figures 9 and 10. The required current regulating resistors 

are included in the pushbutton. There is also a voltage dimming option. 

Unlike the incandescent pushbutton versions without common bussed switch bases, some LED configurations power need 

only to be applied to one pin to control the lighting of a half-screen LED display if the display style is full-screen or half-screen 

displays. 

35

36 



For common lamp circuit configurations common terminals (pins 6 and 9) may be used as the common return circuit for redundancy. 

The schematics of Figures 9 and 10 are typical. Figures 56 and 57 provide a complete set of schematics for all standard colored 

LED configurations. 

Current Requirements for LED Lighting: For 5 volt dc systems, all configurations use 45 mA per quadrant when illuminated. 

Thus, a full-screen unit would use 180 mA, a two-way split with one half lighted would use 90 mA, etc. 

For 28 volt systems, the current requirements dependent upon the configuration. When operated at 28 volts dc, either for a 

full-screen or two-way configuration, the forward current is 20 mA for each half screen which is illuminated (40 mA with both illuminated). 

For three-way split, the one-half screen is 20 mA and each quarter screen is 20 mA (for a total of 60 mA with all three 

areas illuminated). On four-way split configurations, each quadrant uses 20 mA ( mA with all four areas illuminated). 

Maximum current usage for each configuration is tabulated in Table 6B. The current requirements listed are worst-case with all 

legend areas lighted at maximum brightness. 

LED Lighting Control 

The accompanying schematics identify the pins to control the lighting of the specific portions of the displays on 

LED-based pushbuttons. 

Current Sourcing/Sinking for LEDs 

Figures 11 and 12 show simplified schematics of typical control circuits for driving the LED circuits. LED lighted pushbuttons 

may be configured through Table 4 for either current sourcing (codes 7 and 9) or current sinking (codes 8 and 10). 

One characteristic of current sourcing is that it can be used to isolate the lamp load from direct power connection 

if desired. For this, the cathode side of the LEDs is always grounded through a current-regulating resistor. The 

driving circuits supply voltage to the anode side of the LEDs to illuminate them. 

Current sinking, on the other hand, enables the controlling circuits to switch the cathodes to ground to light the 

LEDs. The is a simpler control circuit to implement if MOSFET logic is being used. Also multi-channel output driver 

ICs with common grounded emitters are readily available. 

Dimming 

While incandescent lighting may be controlled by varying the amplitude of the applied ac or dc voltage, this is 

not the ideal way to control LED lighting. LEDs are current-driven devices and operate best at the rated current. 

Dimming is best accommodated 

by turning the LEDs on and off at 

a rate of several thousand times 

per second. During the period of 

time that they are on, they are 

driven at their rated current. The 

ratio of on-time to off-time then 

controls the brightness. The Staco 

Systems DDM111 and DDM111A 

Digital Dimming Module are an 

ideal way to precisely control 

LED brightness. The DDM111 

and DDM111A may also be voltage 

dimmed provided the option 

is selected from the catalog 

(only available in 28 volts) The 

DDM111 and DDM111A are briefly 

 

described on page 56. 

Figure 56


5 Volt LED Circuit Schematics 

Common Circuit Split Circuit 

Display Styles Code Sealed Code Sealed 

Common Lamp Split Lamp 

Code Front View Circuit Sourcing Sinking Circuit Sourcing Sinking 

Rear View A B Rear View C D 

No Yes No Yes No Yes No Yes 

1 2 Full 

1 

Screen 

3 4 

1 2 Horiz. 

2 3 4 Split 

Screen 

31 41 51 61 31 41 51 61 

Vert. 

3 Split 31 41 51 61 31 41 51 61 

Screen 

3 Way 

4 Horiz. 

Split 

Screen 

33 43 53 63 33 43 53 63 

4 Way 

5 Split 35 45 55 65 35 45 55 65 

Screen 

3 Way 

6 Vert. 

Split 

Screen 

3 Way 

7 Horiz. 

Split 

Screen 

3 Way 

8 Vert. 

Split 

Screen 

12 

33 43 53 63 33 43 53 63 

33 43 53 63 33 43 53 63 

33 43 53 63 33 43 53 63 

Figure 57 


NOTES: See Table 4 for current sourcing and sinking codes 7, 8, 9 and 0. 

See Table 5 for display style codes 1 through 8. 

See Table 6B for circuit and seal codes 31 through 66. 

37

38 



28 Volt LED Circuit Schematics 

Common Circuit Split Circuit 

Display Styles Code Sealed Code Sealed 

Common Lamp Split Lamp 

Code Front View Circuit Sourcing Sinking Circuit Sourcing Sinking 

Rear View A B Rear View C D 

No Yes No Yes No Yes No Yes 

1 2 Full 

1 

Screen 

2 

3 4 

1 

3 

2 

4 

Horiz. 

Split 

Screen 

32 42 52 62 32 42 52 62 

Vert. 

3 Split 32 42 52 62 32 42 52 62 

Screen 

3 Way 

4 Horiz. 

Split 

Screen 

34 44 54 64 34 44 54 64 

4 Way 

5 Split 36 46 56 66 36 46 56 66 

Screen 

3 Way 

6 Vert. 

Split 

Screen 

3 Way 

7 Horiz. 

Split 

Screen 

3 Way 

8 Vert. 

Split 

Screen 

2 

1 

NOTES: See Table 4 for current sourcing and sinking codes 7, 8, 9 and 0. 

See Table 5 for display style codes 1 through 8. 

See Table 6B for circuit and seal codes 31 through 66. 

34 44 54 64 34 44 54 64 

34 44 54 64 34 44 54 64 

34 44 54 64 34 44 54 64 

Figure 58

Legends 


Type Style and Fonts 

The standard type face used for legend text is Alternate Gothic Number 2 (AG2), a condensed gothic, sans serif style. 

The nominal letter height-to-width ratio is approximately 6:1. Always Visible White (AVW) legends are an exception; 

they use the Helvetica Light font. 

Character Heights 

The character height, as defined in this document, is the distance (in decimal inches) from the top to bottom of a 

capital letter (no descenders) in the standard font AG2. Unless otherwise specified, the size of punctuation and 

symbols in that font will be artistically proportional to the size specified for the capital letters. 

As listed in Table 5, the standard character heights for the Series 90 Product Line are .072, .087, .100, .125 and 

.145. Other AG2 character heights, available by special order (or if needed, for special artwork) are: .060, .066, .075, .077, 

.080, .082, .090, .094, .097, .105, .110, .114, .120, .132, .139, .155, .164, .175, .188, .203, .219, .239, .263, .293 and .329. 

Standard Character/Symbol Set 

The standard AG2 typeface provides capital letters and numerics in all the sizes listed above. Lower case characters 

are not available in this font. Many typical European characters such as Ä, Å, É, Ö, Ñ, Ü, and others, are 

available as standard within this font. Other symbols available in AG2 include arrows, @, #, $, %, &, (, ), ', !, ., +, /, 

:, ;, =, ?, \, _, , *, ±, °, 1 / 2 , 1 / 4 , and others. 

The “character height” of an arrow is the length from the tip of the point to the end of the shaft, independently of its 

orientation, i.e., a .145” arrow will have the same appearance if vertical or horizontal. 

The symbols * and # are available either as proportional to the size of the AG2 font or as full-size characters with 

the same height of the capital letters. Unless otherwise specified, the symbol used will be the proportional one. 

Optional Fonts 

By special order Helvetica Light and Helvetica Medium are available in a range of sizes similar to that of AG2. Either 

of these Helvetica typefaces may also be ordered in their normal, condensed, bold, or expanded variations. Both of 

these typefaces provide capital letters, numbers, lower case characters, and many of the symbols and European 

characters identified in the previous paragraphs. The “characters per legend area” of Table 5 does not apply. 

Math and Greek Symbols Sets 

Math symbols and Greek characters available by special order and may be mixed with the standard AG2 font. 

Other Non-Roman Alphabets 

Camera ready art, at 10 times the final size, is required for legends using other non-Roman characters 

such as Hebrew, Japanese, Korean, Chinese, Russian, Arabic, Sanskrit, etc. A bold face character set, 

with a stroke width ration of 6:1 or 8:1 is recommended. 

Special Artwork 

Simple shapes, such as squares, rectangles, borders, circles or diagonal lines may be generated in the normal legend-making 

process. For complex shapes, icons, or others graphic symbols, it is recommended that the customer 

supply camera-ready artwork at a 10:1 scale (to fit in a 4.95” square area) for photographic reproduction. 

Characters Per Legend Display Area 

The approximate number of AG2 characters of a given size which will fit into a display area is given in Table 

5. AG2 characters are proportionately spaced (i.e., a character “M” or “W” is about three times as wide as 

the character “I”). The actual number of characters will depend on the specific characters used. If the specific 

characters used in a given area exceed the space available, but by no more than 10%, the characters 

will be condensed by 10%, using the same height but less width, on order to accommodate the legend as 

requested by the customer. 


39

40 



Display Types 

The display types available as standard products in the Series 90 are listed in Table 7, along with the corresponding 

symbol used in MIL-PRF-22885. 

Legend and Faceplate Assemblies 

The lens and faceplate assemblies are part of the pushbutton assembly. These pushbuttons are removable 

from the front of the panel to allow the replacement of incandescent lamps without the need for special tools. 

LEDs are not replaceable. 

Color Filters 

Incandescent and LED display types 2, 3, 4, 5, 8 and 9 utilize color filter caps which may be interchanged 

among the four color cell areas or replaced with color caps ordered from the factory. Incandescent display 

types 1, 6, 7 and 0 utilize flat color filters which are an integral part of the faceplate assembly and are not 

replaceable in the field. 

Customer Replaceable Legends 

Display types 8, 9 and 0 allow for the customer to replace the legends. Each type is available in configurations 

with incandescent lamps. For LED-lighted pushbuttons display types 9 and 0 are available. The overall size of 

the replaceable faceplate is .575” (14.6 mm) square, with a viewing area of .495” (12.6 mm) square. Displays 

with customer installed legends may not be of equal quality to that of factory installed assemblies that are lami- 

nated together. 

Sunlight Readability 

Sunlight readable displays in the Series 90 Product Line provide a black, non-reflective, dead-front appearance 

when no lighted and provide brightly lighted legend characters, in the specified colors, when the displays are energized. 

This display (type 6) protects the crew station viewer from false indications in direct sunlight at high altitude. 

The design overcomes two problems associated with high-intensity light directed at the instrument panel. First, 

when lighted, it enables the viewer to read the legend despite the intense brightness of direct sunlight at 70,000 

feet altitude. Secondly, the design prevents this high intensity light from causing the legends to falsely appear to be 

lighted when the are actually unlighted. The measure of its effectiveness is by means of calculating two sets of con- 

trast ratios based on laboratory measurements conducted under very specific conditions. 

Contrast Ratios 

The average contrast ratio of each legend character to the background is measured with an incidental illumination 

of 10,000 foot-candles minimum, at 5,000° ±500° Kelvin color temperature, directed at an angle of 45° 

±2° to the normal of the viewing surface. Luminance readings are point readings taken with a calibrated photoelectric 

photometer directed perpendicular to the display surface. At least three readings are taken at equally 

spaced points on each legend character and the readings averaged. At least three readings are then taken at 

points in the background immediately adjacent to each character. The contrast ratios C L , and C UL , are calcu- 

lated for each character. 

The lighted contrast (ON/BACKGROUND) is defined by C L = (B 2 - B 1 )/B 1 

The unlighted contrast (OFF/BACKGROUND) is defined by C L = (B 2 - B 1 )/B 1 

B 1 = Average background luminance 

B 2 = Average character luminance, legend lighted 

B 3 = Average character luminance, legend unlighted


Lamps for testing are aged and selected for a mean spherical candlepower (mscp) of .15 ± .02, for general testing, 

and .15 ± .01 for QPL testing. The standard legend for SLR testing has a character height of 0.1 inch (2.54 mm), 

two display lines, and the words “REMOTE” on the top half and “ALT LOW” on the bottom half. 

Incandescent Type 6 

The average contrast ratio of each lighted legend character to background is 0.6 minimum, except for blue 

which will be 0.2 minimum. In the unlighted legend condition, the average contrast ratio of each legend character 

to the background will have an absolute value less than or equal to 0.1. 

SLR And NVIS-Compatibility 

Incandescent LED pushbuttons with NVIS-compatible colors will have an average contrast ratio of each lighted 

legend character to the background of at least 0.6 in accordance with MIL-STD-3009. The unlighted contrast 

ratio for each individual character will not exceed 0.1. Incandescent lighted NVIS Red will have an average 

lighted contrast ratio for the entire legend of 0.6 or greater, however, individual characters may be below that 

contrast ratio. LED pushbuttons add NVIS White and NVIS Blue to the available colors. 

Sunlight readability requirements apply to NVIS-compatible LED pushbutton configurations. 

SLR Sealed Displays 

SLR performance is not degraded for standard Dripproof, Splashproof or Watertight seals. SLR requirements do 

not apply to Solvent Resistant or Hazardous Environment Seals. 

Night Vision Imaging System 

Series 90 Products, when type 7 legends are specified, provide instrumentation displays which are compatible with 

night vision imaging systems (NVIS). NVIS compatibility is ensured with extensive testing and analysis by a computer 

controlled and calibrated spectral radiometer, the most accurate and sophisticated NVIS laboratory equipment 

available. This system is used to qualify products, to evaluate incoming filters and to perform certifications. 

Also, all NVIS-compatible products are 100% inspected for IR leakage prior to shipment. 

NVIS Qualifications 

The Series 90 incandescent versions are fully qualified to MIL-STD-3009 under MIL-S-22885/101 for NVIS compatibility 

for the colors Green A, Green B, Yellow and Red, and for Type I systems, Class A and Class B goggles, 

and for Type II systems, Class A and Class B goggles, where applicable. These NVIS units are also “sunlight read- 

able” per MIL-S-22885/101. 

NVIS Green A and B: Shall meet all Class A and Class B equipment requirements for illuminated controls. NVIS 

Yellow: Shall meet all Class A and Class B equipment requirements for caution and warning signals. NVIS Red: 

Shall meet Type I and Type II Class B equipment requirements for electronic and electro-optical displays (multicolor). 

NVIS Blue: NVIS radiance shall meet all Class A and Class B equipment for illuminated controls. Color 

coordinates shall be within the following limits of the CIE 1976 UCS chromaticity diagram: u'1=.175, v'1=.167, 

r=.040 (Blue color is not specified by existing military standards for NVIS compatible lighting at the time of prepa- 

ration of this slash sheet. 


41

42 



Chromaticity requirements (MIL-STD-3009, Table II) are simplified and given in accompanying table and are shown 

graphically in CIE chart form in Figure 14. 

TABLE II. NVIS chromaticity requirements. 1/ 

NVIS WHITE NVIS RED NVIS NVIS NVIS NVIS BLUE 

GREEN A GREEN B YELLOW 

Code NW Code NR Code GA Code GB Code NY Code NB 

u’1 v’1 r u’1 v’1 r u’1 v’1 r u’1 v’1 r u’1 v’1 r u’1 v’1 r 

0.190 0.490 0.040 0.450 0.550 0.060 0.088 0.543 0.037 0.131 0.623 0.057 0.274 0.622 0.083 0.175 0.167 0.040 

1/ The colors are expressed as ‘ u’1 ‘, “ v’1 “ and ‘ r ‘ on the CIE 1976 UCS chromaticity 

diagram. Illuminated colors, measured as specified herein, shall be within the limits 

bounded by the coordinates listed for each color. 

Night Vision Imaging System Types 

MIL-STD-3009 defines night vision imaging systems by type and class. Type I is direct view imaging where the 

Gen III night vision goggle (NVG) is used to view outside the cockpit and the pilot glances under the goggles to 

view the instruments. Type II also is a Gen III goggle, but uses a projected image where the pilot simultaneously 

views both external and internal information through optical mixers. 

Night Vision Imaging System Classes 

Two NVIS classes have been defined, based on the cut-off frequency of the filters used in the goggles. Class A NVIS 

uses the 625 nanometer (nm) minus blue objective lens filter while Class B uses the 665 nm filter. The lower cut-off 

of the Class A filters allows for maximum near-IR response to tree bark, grass and other green vegetation, a general 

requirement for helicopter applications operating below tree-top level. The Class B filter, with the higher cut-off, allows 

the goggles to be used in conjunction with orange and red warning indicators in the cockpit, and is intended for aircraft 

which are operating above tree level. 

NVIS Radiance 

The NVIS radiance (NR) is measured for Class A (NRA) for compatibility with 625 nm applications, and for Class 

B (NRB) for 665 nm systems. Both are the result of spectral radiance measurements, in 5 nm increments, from 

450 to 930 nm. The readings are automatically scaled by the spectroradiometer system to a selected brightness level 

given in footlamberts. 

NVIS Radiance Requirements 

The accompanying table summarizes the NVIS 

radiance specification (MIL-STD-3009, Table IX) for 

configurations which are applicable to the Series 90 

product line. 

NVIS Radiance Requirements of NVIS-Compatible Light Sources 

Type I Systems 

NVIS Class A Goggles Class B Goggles Luminance 

Color 

Min NRA Max NRA Min NRB Max NRB 

fL 

Green A – 1.7E-10 – 1.7E-10 0.1 

Green B – 1.7E-10 – 1.7E-10 0.1 

Yellow 5.0E-8 1.5E-7 4.7E-8 1.4E-7 15.0 

Red Not Applicable 4.7E-8 1.4E-7 15.0 

Type II Systems 

NVIS Class A Goggles Class B Goggles Luminance 

Color 

Min NRA Max NRA Min NRB Max NRB 

fL 

Green A – 1.7E-10 – 1.7E-10 0.1 

Green B – 1.7E-10 – 1.7E-10 0.1 

Yellow – 1.5E-7 – 1.4E-7 15.0 

Red Not Applicable – 1.4E-7 15.0

Materials 


Finish 

Black anodize over aluminum alloy, when used, is per MIL-STD-3009, Type II, Class 2. Chemical film 

finishes, when used, are per MIL-C-5541, Class 3. Dull black chrome finish, when used, is applied over 

electroless nickel per MIL-C-14538. 

Terminal Plating 

Tin-lead plating of solder terminals is per MIL-P-81728. Gold plating, when specified, is per MIL-G-45204. 

Printed circuit board terminals are suitably plated to facilitate hand, wave or flow soldering methods. Crimp pin terminals 

are gold plated per MIL-G-45204. 

Silicone Rubber 

Silicone rubber, when used, is in accordance with ZZ-R-765, rubber, silicone. 

Fluorosilicone Rubber 

Fluorosilicone rubber, when used, is in accordance with MIL-R-25988, rubber, fluorosilicone elastomer, oil 

and fuel resistant. 

Prohibited Finishes 

Cadmium plating is not used on any part for the product line. Pure tin plating is also prohibited as a final 

finish or as an undercoat since it may result in tin whisker growth which may adversely affect the operation 

of electronic equipment systems. Use of tin-lead (Sn-Pb) finishes are acceptable provided that the minimum 

lead content is 3%. 

Ozone Depleting Chemicals 

Ozone depleting chemicals (OCD’s) are not used in any products or manufacturing processes used in this 

product line. [ODC’s include chlorofluorocarbons (CFC’s), hydrochloroflurocarbons (HCFC’s), methyl chloroform, 

carbon tetrachloride and halons.] 

Quality 

Material and products are controlled and inspected per the requirements of MIL-I-45208. The maintenance 

of the calibration system to control the accuracy of the measuring and test equipment is in accordance 

with MIL-STD-45662. Product inspection for delivery consists of Group A inspectors per MIL-PRF-22885 

and the applicable slash sheet. 

Staco Systems maintains a fully equipped and certified laboratory to perform environmental and lighting 

tests in accordance with the requirements of MIL-PRF-22885 and MIL-STD-3009. 


43

44 

MILITARY CROSS REFERENCE MIL-PRF-22885/101 

Various Series 90 Switches, Indicators and Display 

Screen Pushbutton have been granted Qualified 

Products Listing under MIL-PRF-22885. The following 

list is a random selection of MIL-Spec part numbers. 

It does not include lamps, legends or retainers. 

Should you wish to order assemblies with these 

features, please utilize the coded part number system 

detailed within this catalog or contact the factory for 

special ten digit part numbers unique to your specific 

project application. Specific cross reference part 

numbers are available on request. 

Example: 

M22885/101E031W2GR 9305611201052211 

A 1X Full ScreenDisplay requires that all 4X positions 

be coded with the same color code number from the 

table below. 

1X 1 

2XX 

1 

2 

A 2XX Horizontal Split Screen 

Display requires that the first two 

X positions be coded with the 

color digit desired in Area 1 and 

the last two X positions be coded 

with the color digit in Area 2. 

MIL-S-22885 Description Series 90 

Symbol Code 

Display Types 

C Colored Background 1 

B 

H 

Hidden Legend, 

Lighted Background 

Hidden Legend, 

Lighted Characters 

N Opaque Background 4 

W White Background 5 

S Sunlight Background 6 

S NVIS Compatible 7 

Standard Colors 

W White 0 

R Red 1 

G Green 2 

Y Aviation Yellow 3 

D Lunar White 4 

– Lemon Yellow 5 

B Blue 6 

Z Aviation Green 7 

NVIS Colors 

H Green A 6 

J Green B 2 

K Yellow 5 

L Red 1 

2 

3

Indicators 

MILITARY CROSS REFERENCE MIL-22885/101 

Dripproof Seal, Non-RFI Dripproof Seal, RFI Shielded 

M22885/101E 930551 M22885/101E 930552 

031N1X 110104XXXX 087N1X 410104XXXX 

031N2XX 120104XXXX 087N2XX 420104XXXX 

031W1X 110105XXXX 087W1X 410105XXXX 

031W2XX 120105XXXX 087W2XX 420105XXXX 

031S1X 110106XXXX 087S1X 410106XXXX 

031S2XX 120106XXXX 087S2XX 420106XXXX 

174N1X 210104XXXX 184N1X 510104XXXX 


174W1X 210105XXXX 184W1X 510105XXXX 


174S1X 210106XXXX 184S1X 510106XXXX 


032N1X 310104XXXX 088N1X 610104XXXX 


032W1X 310105XXXX 088W1X 610105XXXX 


032S1X 310106XXXX 088S1X 610106XXXX 


Switches, SPDT, Silver Contacts Momentary 

Dripproof Seal, Non-RFI Dripproof Seal,RFI Shielded 

M22885/101E 930111 M22885/101E 930112 

035N1X 110104XXXX 091N1X 410104XXXX 


035W1X 110105XXXX 091W1X 410105XXXX 


035S1X 110106XXXX 091S1X 410106XXXX 


175N1X 210104XXXX 185N1X 510104XXXX 


175W1X 210105XXXX 185W1X 510105XXXX 


175S1X 210106XXXX 185S1X 510106XXXX 


036N1X 310104XXXX 092N1X 610104XXXX 


036W1X 310105XXXX 092W1X 610105XXXX 


036S1X 310106XXXX 092S1X 610106XXXX 


Switches, SPDT, Gold Contacts Momentary 


M22885/101E 930311 M22885/101E 930312 

039N1X 110104XXXX 095N1X 410104XXXX 


039W1X 110105XXXX 095W1X 410105XXXX 


039S1X 110106XXXX 095S1X 410106XXXX 


176N1X 210104XXXX 186N1X 510104XXXX 


176W1X 210105XXXX 186W1X 510105XXXX 


176S1X 210106XXXX 186S1X 510106XXXX 


040N1X 310104XXXX 096N1X 610104XXXX 


040W1X 310105XXXX 096W1X 610105XXXX 


040S1X 310106XXXX 096S1X 610106XXXX 


Switches, DPDT, Silver Contacts Momentary 



M22885/101E 930211 M22885/101E 930212 

043N1X 410104XXXX 099N1X 410104XXXX 


043W1X 410105XXXX 099W1X 410105XXXX 


043S1X 410106XXXX 099S1X 410106XXXX 


177N1X 510104XXXX 187N1X 510104XXXX 


177W1X 510105XXXX 187W1X 510105XXXX 


177S1X 510106XXXX 187S1X 510106XXXX 


044N1X 610104XXXX 100N1X 610104XXXX 


044W1X 610105XXXX 100W1X 610105XXXX 


044S1X 610106XXXX 100S1X 610106XXXX 


Switches, DPDT, Gold Contacts Momentary 


M22885/101E 930411 M22885/101E 930412 

047N1X 410104XXXX 103N1X 410104XXXX 


047W1X 410105XXXX 103W1X 410105XXXX 


047S1X 410106XXXX 103S1X 410106XXXX 


178N1X 510104XXXX 188N1X 510104XXXX 


178W1X 510105XXXX 188W1X 510105XXXX 


178S1X 510106XXXX 188S1X 510106XXXX 


048N1X 610104XXXX 104N1X 610104XXXX 


048W1X 610105XXXX 104W1X 610105XXXX 


048S1X 610106XXXX 104S1X 610106XXXX 


Switches, SPDT, Silver Contacts Alternate Action 


M22885/101E 930121 M22885/101E 930122 

050N1X 410104XXXX 106N1X 410104XXXX 


050W1X 410105XXXX 106W1X 410105XXXX 


050S1X 410106XXXX 106S1X 410106XXXX 


197N1X 510104XXXX 213N1X 510104XXXX 


197W1X 510105XXXX 213W1X 510105XXXX 


197S1X 510106XXXX 213S1X 510106XXXX 


201N1X 610104XXXX 217N1X 610104XXXX 


201W1X 610105XXXX 217W1X 610105XXXX 


201S1X 610106XXXX 217S1X 610106XXXX 


45

46 

MILITARY CROSS REFERENCE MIL-22885/101 

Switches, SPDT, Gold Contacts Alternate Action 


M22885/101E 930321 M22885/101E 930322 

052N1X 410104XXXX 108N1X 410104XXXX 


052W1X 410105XXXX 108W1X 410105XXXX 


052S1X 410106XXXX 108S1X 410106XXXX 


198N1X 510104XXXX 214N1X 510104XXXX 


198W1X 510105XXXX 214W1X 510105XXXX 


198S1X 510106XXXX 214S1X 510106XXXX 


202N1X 610104XXXX 218N1X 610104XXXX 


202W1X 610105XXXX 218W1X 610105XXXX 


202S1X 610106XXXX 218S1X 610106XXXX 


Switches, DPDT, Silver Contacts Alternate Action 


M22885/101E 930221 M22885/101E 930222 

054N1X 410104XXXX 110N1X 410104XXXX 


054W1X 410105XXXX 110W1X 410105XXXX 


054S1X 410106XXXX 110S1X 410106XXXX 


199N1X 510104XXXX 215N1X 510104XXXX 


199W1X 510105XXXX 215W1X 510105XXXX 


199S1X 510106XXXX 215S1X 510106XXXX 


203N1X 610104XXXX 219N1X 610104XXXX 


203W1X 610105XXXX 219W1X 610105XXXX 


203S1X 610106XXXX 219S1X 610106XXXX 


Switches, DPDT, Gold Contacts Alternate Action 


M22885/101E 930421 M22885/101E 930422 

056N1X 410104XXXX 112N1X 410104XXXX 


056W1X 410105XXXX 112W1X 410105XXXX 


056S1X 410106XXXX 112S1X 410106XXXX 


200N1X 510104XXXX 216N1X 510104XXXX 


200W1X 510105XXXX 216W1X 510105XXXX 


200S1X 510106XXXX 216S1X 510106XXXX 


204N1X 610104XXXX 220N1X 610104XXXX 


204W1X 610105XXXX 220W1X 610105XXXX 


204S1X 610106XXXX 220S1X 610106XXXX 

2040S2XX 620106XXXX 220S2XX 620106XXXX


Part or Identify Number (PIN): The PIN shall be constructed as illustrated in the following example: 

E 2 4 4 G 

Basic specification and detail configuration slash sheet number. 

Codes from table IV through table VII. 

Pushbutton display and LED configuration - table VIII. 

Pushbutton display circuit configuration - table VII. 

Switch circuit, action, and contact material - table V. 

Housing enclosure design - table IV. 

Legend details and display screen colors are not defined by the PIN. These details are specified by user's 

acquisition documents in accordance with the acquisition requirements for category II switches, see section 6 

of MIL-PRF-22885. For the convenience of users, and extension to the PIN may be utilized on the acquisition 

document to define the legend details and colors. The method of constructing this extension is illustrated 

below. The extension is for convenience only and is not part of the PIN. 

M22885/XXXE244G 

Switch housing and termination configuration - table VI. 

PIN 

22 4 AY RD XX (TURBINE; HEAT) (HI) 


Acquisition document details for 

pushbutton legend and display. 

Callouts must be in the sequence 

shown. 

Legends for display screen areas 1, 

2, and 3 respectively. Legends for 

each area enclosed by parentheses. 

Multiple legend lines separated by 

semicolon. 

Color code for display screen areas 

1,2, and 3 respectively. See tables I 

and II for color selection. When any 

of these areas are not applicable, 

insert XX in that space. 

Type of legend display illumination 

and contrast. See table X for 

selection. 

Legend character size. See table IX 

for selection 

47

48 


MIL-PRF-22885/1 12 

TABLE IV. Codes for housing enclosure design. 

Enclosure design Without EMI/RFI 

shielding 

75 G High-impact 

shock shock 

With solder terminations: 

Unsealed 

A 

--- 

Dripproof 

B 

--- 

Watertight/splashproof 

With CTS terminations: 

C 

S 

Unsealed 

E 

--- 

Dripproof 

F 

--- 

Watertight/splashproof 

G 

U 

75 G 

shock 

TABLE V. Codes for switch circuit, action, and contact material. 

Switch circuit Contact material 

Silver Gold 

Momentary action: 

Single pole, double throw (SPDT) 1 5 

Double pole, double throw (DPDT) 2 6 

Alternate action: 

Single pole, double throw (SPDT) 3 7 

Double pole, double throw (DPDT) 4 8 

Indicator: --- 0 

TABLE VI. Codes for termination type. 

Termination type Code 

Turret, solder 1 

Common termination system (CTS): 

Without termination module 1/ 3 

With termination module 

per MIL-C-39029/16-168 2/ 4 

With termination module 

per MIL-C-39029/22-192 2/ 5 

1/ Designates CTS switch housing without connector 

module. Connector modules may be supplied prewired 

to wire harness assembly. 

2/ Designates CTS MIL-PRF-22885/1 switch housing 12 with connector 

module installed. Sealing plugs and termination 

pins not included. 

TABLE VII. Pushbutton display module LED circuit configuration. 

Common circuit configuration Code 

Single Split 

common common 

Negative common (ground) 

1 

3 

Positive common (ground) 

2 

4 

17 

TABLE VIII. Pushbutton display screen and LED design. 

J 

K 

L 

N 

O 

P 

With EMI/RFI 

shielding 

High-impact 

shock 

--- 

--- 

W 

--- 

--- 

Y 

Display screen design code

MILITARY CROSS REFERENCE MIL-PRF 22885/112 

1/ Alpha-numeric character format is alternate gothic number 2, Sans-serif. 

2/ Number of characters shown above is number of lines times number of 

characters per line. For example, 5 x 12 is 5 lines of 12 characters each. 

3/ Maximum number of characters per line shown above is an approximate value. The 

actual number of characters may be more or less, depending on characters used. 

4/ Size codes 10, 20, and 30 are not applicable to legend codes 6 and 7 of 

table X. 

TABLE X. Legend display and illumination details. 

Code Nonilluminated LED illuminated MIL-PRF-22885 

display type 

Legend Background Legend Background 

4 1/ White Black Filter color Black N 

5 1/ Black White Black Filter color W 

6 2/ Hidden Black Filter color Black S 

7 2/ Hidden Black NVIS filter 

color 

Black S 


49

50 

TABLES 

Table 1 – Terminations, Circuitry & Contact Material 

CODE 

TYPE OF 

TERMINATION 

NUMBER OF POLES OR INDICATORS 

SWITCH 

CONTACT 

MATERIAL 

01 Solder Single Pole Double Throw (SPDT) Silver 

02 Solder Double Pole Double Throw (DPDT) Silver 

03 Solder Single Pole Double Throw (SPDT) Gold 

04 Solder Double Pole Double Throw (DPDT) Gold 

05 Solder Indicator Only None 

06 PCB Single Pole Double Throw (SPDT) Silver 

07 PCB Double Pole Double Throw (DPDT) Silver 

08 PCB Single Pole Double Throw (SPDT) Gold 

09 PCB Double Pole Double Throw (DPDT) Gold 

10 PCB Indicator Only None 

16 Crimp Pin 1/ Single Pole Double Throw (SPDT) Silver 

17 Crimp Pin 1/ Double Pole Double Throw (DPDT) Silver 

18 Crimp Pin 1/ Single Pole Double Throw (SPDT) Gold 

19 Crimp Pin 1/ Double Pole Double Throw (DPDT) Gold 

20 Crimp Pin 1/ Indicator Only None 

21 Crimp Pin 2/ Single Pole Double Throw (SPDT) Silver 

22 Crimp Pin 2/ Double Pole Double Throw (DPDT) Silver 

23 Crimp Pin 2/ Single Pole Double Throw (SPDT) Gold 

24 Crimp Pin 2/ Double Pole Double Throw (DPDT) Gold 

25 Crimp Pin 2/ Indicator Only None 

1/ Used with Model 98 Switch Base or Model 99 Switch Assembly, and Series 95 or 97 Matrix 

Assemblies (long) requiring MIL-C-39029/16-168 Crimp Pin Receptacles. 

2/ Used with Model 98 Switch Base or Model 99 Switch Assembly, and Series 95 or 97 Matrix 

Assemblies (short) requiring MIL-C-39029/22-192 Crimp Pin Receptacles. 

NOTE: Code numbers 11 through 15 have been deleted. They previously represented wire wrap terminations 

and have been discontinued.

CODE 

TYPE OF 

UNIT 

TYPE OF 

ACTION 

TABLES 

Table 2 – Switch Action, Pushbutton Retainer, and Lamp Wiring Requirement 

PUSHBUTTON 

RETAINER 


LAMP WIRING 

COMMON BUS 

CONFIGURATION 

1 Switch Momentary Yes 1/ No 

2 Switch Alternate Yes 1/ No 

3 Switch Momentary No No 

4 Switch Alternate No No 

5 Indicator None Yes 1/ No 

6 Indicator None No No 

7 Switch Momentary Yes 1/ 

8 Switch Alternate Yes 1/ 

9 Switch Momentary No 

0 Switch Alternate No 

A . Indicator None Yes 1/ 

B Indicator None No 

C Switch Momentary Yes 1/ 

D Switch Alternate Yes 1/ 

E Switch Momentary No 

F Switch Alternate No 

G Indicator None Yes 1/ 

H Indicator None No 

Yes 2/ 

Single 

Two or Three Wire System 

Yes 2/ 

Single 


Yes 2/ 

Single 


Yes 2/ 

Single 


Yes 2/ 

Single 


Yes 2/ 

Single 


Yes 2/ 

Horizontal 

Three or Four Wire System 

Yes 2/ 

Horizontal 


Yes 2/ 

Horizontal 


Yes 2/ 

Horizontal 


Yes 2/ 

Horizontal 


Yes 2/ 

Horizontal 


51

52 

Table 2 (continued) 

CODE 

TYPE OF 

UNIT 

TYPE OF ACTION 

TABLES 

PUSHBUTTON 

RETAINER 

i 3/ Switch Momentary Yes 1/ 

J Switch Alternate Yes 1/ 

K Switch Momentary No 

L Switch Alternate No 

M Indicator None Yes 1/ 

N Indicator None No 

_ 4/ Switch Momentary Yes 1/ 

P Switch Alternate Yes 1/ 

Q Switch Momentary No 

R Switch Alternate No 

S Indicator None Yes 1/ 

T Indicator None No 

U Switch Momentary Yes 1/ 

V Switch Alternate Yes 1/ 

W Switch Momentary No 

X Switch Alternate No 

Y Indicator None Yes 1/ 

Z Indicator None No 

LAMP WIRING 

COMMON BUS 

CONFIGURATION 

Yes 2/ 

Bottom 

Four or Five Wire System 

Yes 2/ 

Bottom 


Yes 2/ 

Bottom 


Yes 2/ 

Bottom 


Yes 2/ 

Bottom 


Yes 2/ 

Bottom 


Yes 2/ 

Top 


Yes 2/ 

Top 


Yes 2/ 

Top 


Yes 2/ 

Top 


Yes 2/ 

Top 


Yes 2/ 

Top 


Yes 2/ 

Vertical 


Yes 2/ 

Vertical 


Yes 2/ 

Vertical 


Yes 2/ 

Vertical 


Yes 2/ 

Vertical 


Yes 2/ 

Vertical 


1/ Retainer applies only when ordered as part of assemblies which include pushbuttons.

Table 3 – EMI/RFI & Sealing 

TABLES 

2/ Common bus configuration applies only to incandescent lamp based switch and indicator. 

3/ Lower case letter "i". Do not use upper case letter "I" to differentiate it with number “1” 

4/ Underscore "_". Do not use dash "-", because a dash is used as a delimiter between the switch 

and pushbutton portions of a part number within Staco Systems. 

CODE TYPE OF DRIP SEAL VS. EMI/RFI VS. 

MOUNTING UNSEALED NON-EMI/RFI 

SHIELDING 

01 Individual Sealed Non-EMI/RFI 

02 Individual Sealed EMI/RFI 

03 Individual Unsealed Non-EMI/RFI 

04 Individual Unsealed EMI/RFI 

1 

05 Matrix Sealed Non-EMI/RFI 

06 Matrix 1 

Sealed EMI/RFI 

1 

07 Matrix Unsealed Non-EMI/RFI 

1 

08 Matrix Unsealed EMI/RFI 

1 

For mounting in models 94, 95, 96 and 97 matrix frame assemblies. 

Table 4 – Incandescent or LED, Ground Options and EMI/RFI 

CODE LIGHT SOURCE 

COMMON 

CIRCUIT 

CONFIGURATION 

EMI/RFI 

SHIELDED 


CURRENT 

SOURCING 

OR SINKING 

1 Incandescent Single Common No Not Applicable 

2 Incandescent Vertical Split No Not Applicable 

3 Incandescent Horizontal Split No Not Applicable 

4 Incandescent Single Common EMI/RFI Not Applicable 

5 Incandescent Vertical Split EMI/RFI Not Applicable 

6 Incandescent Horizontal Split EMI/RFI Not Applicable 

A High Brightness (HB) LED Single Common EMI/RFI Sourcing 

B High Brightness (HB) LED Single Common EMI/RFI Sinking 

C High Brightness (HB) LED Split Common EMI/RFI Sourcing 

D High Brightness (HB) LED Split Common EMI/RFI Sinking 

E HB LED with Voltage Dimming 1/ Single Common EMI/RFI Sourcing 

F HB LED with Voltage Dimming 1/ Single Common EMI/RFI Sinking 

G HB LED with Voltage Dimming 1/ Split Common EMI/RFI. Sourcing 

H HB LED with Voltage Dimming 1/ Split Common EMI/RFI Sinking 

1/ Available for 28V DC only. 

53

54 

TABLES 

Table 5 – Display Style And Character Definition 

CODE CHARACTER DISPLAY LEGEND AREA Display 

No. SIZE IN 

INCHES (Ref.) 

AREA NO. (H) Horizontal lines per area 

(C) Characters per line 

1 

Style 

Descriptions 

1 HXC 2 HXC 3 HXC 4 HXC 

10 none none none none none 

11 .072 5x12 X X X 

12 

13 

.087 

.100 

1 

4x10 

4x9 

X 

X 

X 

X 

X 

X 

Full Screen 

Display 

14 .125 3x7 X X X 

15 .145 2x6 X X X 


21 

22 

.072 

.087 

1 

2x12 

2x10 

2x12 

2x10 

X 

X 

X 

X 

2 Way 

Horizontal 

23 

24 

.100 

.125 

2 

1x9 

1x7 

1x9 

1x7 

X 

X 

X 

X 

Split Screen 

Display 

25 .145 1x6 1x6 X X 


31 .072 5x6 5x6 X X 2 Way 

32 

33 

.087 

.100 

1 2 

4x4 

4x4 

4x4 

4x4 

X 

X 

X 

X 

Vertical 

Split Screen 

34 .125 3x3 3x3 X X Display 

35 .145 2x2 2x2 X x 

40 

41 

42 

43 

44 

45 

none 

.072 

.087 

.100 

.125 

.145 

2 

1 

3 

none 

2x12 

2x10 

1x9 

1x7 

1x6 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

X 

X 

X 

X 

X 

3 Way 

Split Screen 

Display 

(Horizontal 

Top Half) 


51 

52 

.072 

.087 

1 2 

2x6 

2x4 

2x6 

2x4 

2x6 

2x4 

2x6 

2x4 

4 Way 

Split Screen 

53 

54 

.100 

.125 

3 4 

1x4 

1x3 

1x4 

1x3 

1x4 

1x3 

1x4 

1x3 

Display 

55 .145 1x2 1x2 1x2 1x2 

60 

61 

62 

63 

64 

65 

none 

.072 

.087 

.100 

.125 

.145 

1 

2 

3 

none 

5x6 

4x4 

4x4 

3x3 

2x2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

X 

X 

X 

X 

X 

3 Way 

Split Screen 

Display 

(Vertical 

Left Half) 

70 

71 

72 

73 

74 

75 

none 

.072 

.087 

.100 

.125 

.145 

1 

3 

2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

2x12 

2x10 

1x9 

1x7 

1x6 

none 

X 

X 

X 

X 

X 

3 Way 

Split Screen 

Display 

(Horizontal 

Bottom Half) 

80 

81 

82 

83 

84 

85 

none 

.072 

.087 

.100 

.125 

.145 

1 

3 

2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

5x6 

4x4 

4x4 

3x3 

2x2 

none 

2x6 

2x4 

1x4 

1x3 

1x2 

none 

X 

X 

X 

X 

X 

3 Way 

Split Screen 

Display 

(Vertical 

Right Half) 

NOTES: 

1 This is an approximate 

value. Actual number of 

characters will depend on 

the specific characters 

used. If the specific 

characters used exceed 

the space available, the 

characters will be condensed, 

but only by 10% 

using the same height, 

in order to accommodate 

the legend requested. 

2 The character format for 

legend alphanumeric is 

Alternate Gothic No. 2 

(AG2), a condensed, 

sans serif font. 

3 The character height, as 

defined here, is the dis- 

tance (in decimal inches) 

from the top to bottom of 

a capital letter (excluding 

descenders) in the stand- 

ard AG2 font. Unless 

otherwise specified, the 

punctuation and symbols 

in that font will be artist- 

ically proportional to the 

size specified for the 

capital letters. 

4 The standard type font, 

AG2, provides capitals 

and numerics; lowercase 

characters are not avail- 

able in this font. Many 

foreign characters, such 

as Å, É, O, Ñ, U and 

others are available. 

Helvetica typefaces, 

math symbols and Greek 

characters are available 

by special order. 

5 Camera ready art, at 10 

times the final size, is 

required for non-Roman 

characters (such as 

Hebrew, Japanese, 

Korean, Chinese and 

Russian). 

6 For special graphic artwork, 

contact the 

factory-based Sales 

department.

TABLES 

Table 6A – Incandescent Lamp Selection & Sealing 

NOTES: 

CODE 

NOT SEALED INCANDESCENT MAXIMUM MAXIMUM RESULTING AVERAGE LIFE 

SEALED LAMP TYPE DESIGN MILLIAMPS POWER M.S.C.P. HOURS 

VOLTS PER WATTS 

7 1 2 

00 10 Fiberboard Plate “DISCARD” Required 

1 All lamps are T-1 sub-midget flange based. 

2 Lamp code numbers 01 through 09 and 11 through 

19 require four (4) each per pushbutton. 

3 Current (milliamp) values are with all four quadrants 

lighted. 

4 Lamp specifications and performance are published 

by the lamp manufacturers. Staco Systems does not 

warrant lamp performance as specified. 

5 When lamps are not furnished with pushbuttons, a 

removable fiberboard plate is installed at the factory 

in order to insure the pushbutton returns to full 

normal position. This plate is removed and discarded 

when lamps are installed. Applies to code 00 and 10. 

6 Caution: Do not install pushbutton without lamps or 

dummy lamps in all four positions, or a fiberboard 

(discard) in place. Otherwise, when power is 

connected, a short circuit will result. 

7 Pushbutton with Night Vision Imaging System (NVIS) 

compatible display (Type 7, NVG) must be “sealed.” 

8 Recommended for lower faceplate temperature. 

9 SLR performance may be degraded with these lamps. 

10 Unless otherwise specified, MSCP values are ± 25%. 

PUSHBUTTON PER P/B 

01 11 3071 5.0 240 1.2 0.15 5,000 

02 12 718 5.0 460 2.3 0.15 40,000 

03 13 N/A 

8 

04 14 3335 28.0 64 1.8 0.08 2,500 

05 15 3042 6.0 240 1.4 0.13 3,000 

06 16 1099 12.0 240 2.9 0.15 16,000 

07 17 3229 14.0 160 2.2 0.15 16,000 

08 18 6838 28.0 96 2.7 0.15 16,000 

09 19 15091 Dummy Lamp Plug 

8 

6 


3 

APPLICATION NOTES: 

The faceplate temperature will stabilize at ambient 

room temperature of 72°F, and with no forced air 

movement, 120°F with .72W to 1.14W of power input, 

depending on display type, and at 140°F with .87W to 

1.62W. It is recommended to reduce the input power 

and improve the heat exchange efficacy of the push- 

button either by: 

1. Reducing the input power to the lamp. 

2. Utilizing forced air movement. 

3. Reducing duty cycle, thus reducing over all input 

power per unit of time of each lamp. 

4. Reducing the number of active lamps for long 

periods of operation. 

5. Mitigating excessive power radiation and conduc- 

tion with reductions in ambient temperature, 

increased flow of cooling air, and enhanced 

heat-sinking of mounting panels. 

6. Using low wattage lamps, such as the 3071 for 

5 volt applications or the 3335 for 28 volt 

applications. 

7. Changing design to higher efficacy illuminant 

source, Light Emitting Diodes (LED) lighting. 

10 

5 

9 

9 

55

56 

TABLES 

Table 6B – LED Configuration & Sealing 

CODE 

CURRENT CURRENT MAXIMUM 

SOURCING SINKING MILLIAMPS 

LED DISPLAY DESIGN PER 

NOT 

SEALED 

NOT 

SEALED SEALED 

SEALED 

CONFIGURATION VOLTS PUSHBUTTON 

31 41 51 61 Full & 2-Way 5 180 

32 42 52 62 Full & 2-Way 28 40 

33 43 53 63 3-Way 5 180 

34 44 54 64 3-Way 28 60 

35 45 55 65 4-Way 5 180 

36 46 56 66 4-Way 28 80 

NOTES TABLE 6B: 

1 All pushbutton with voltage dimming require 80 mA at 28 V. 

2 Actual current can be significantly lower. 

Table 7 – Display Type 

1 

2 

3 

4 

5 

6 

7 

8 

9 

0 

Type Code 

note / 

2 

2 

2 

2 

6 

1 

2 

3 

4 

5 

6 8 

6 

Lamps Off 

Lamps On 

9 

7 

MIL-S- 

22885 

SYMBOL 

LEGEND 

C Black 

B 

Hidden 

Black 

BACK- 

GROUND 

Translucent 

Color 

H Hidden Black 

N 

Transluce 

nt White 

W Black 

LEGEND 

Black Black 

Black 

Translucent 

White 

S Hidden Black 

BACK- 

GROUND 

INCAN- 

DESCENT 

LAMP 

2 

HIGH BRIGHTNESS 

LED 

Black Color Flat Filter Flat Filter 

Visible in 

Color 

Visible in 

Color 

Visible in 

Color 

Lamp Cap 

Black Lamp Cap 

Black Lamp Cap Flat Filter 

Black Color Lamp Cap Flat Filter 

Visible in 

Color 

Black Flat Filter Flat Filter 

S Hidden Black NVG Color Black NVG Filter NVG Filter 

B 

Hidden 

Black 

W Black 

NON-ILLUMINATED 

H Hidden Black 

ILLUMINATED 

LIGHT SOURCE AND COLOR 

SOURCES 

Customer Replaceable Legends 

Black Black 

Visible in 

Color 

Lamp Cap 

Translucent 

White 

Black Color Lamp Cap 

Visible in 

Color 

Black Flat Filter Flat Filter 

1 4 5 9 

1 2 3 4 5 6 7 8 9 0 

NOTES TABLE 7: 

1 

2 

3 

4 

5 

6 

7 

8 

9 

Type 1- Styles 20 through 

85 (Ref. Table 5) will have 

.026” black bars as visual 

split screen separators. 

Available in LED lighted 

configurations. 

LED Type 5 Styles 20 

through 85 (Ref. Table 5) 

will have .046” black bars 

as visual split screen 

separators. 

Type 6 - Sunlight Readable 

The display is readily 

discernible under 10,000 

footcandles of direct 

light when tested per 

Mil-PRF-22885/101. Nonilluminated 

legends are not 

discernible. Recommended 

legend height is .100. 

Type 7 -Night Vision 

Imaging System (NVIS) 

compatible display. When 

illuminated, legends are 

compatible with NVIS 

(Gen. III) night vision 

goggles. Applies to 

incandescent and LED 

configurations. Botht versions 

are also sunlight 

readable. Non-illuminated 

legends are not discernible. 

(Available in “sealed” version 

only.) 

Customer replaceable legends 

(Display Types 8,9 

and 0) may not be of equal 

quality to those which are 

factory assembled. 

Type 8 - Similar to Type 2. 

Type 9 - Similar to Type 5. 

Type 0 - Similar to Type 6.

Table 8 – Cell Color 

CODE 

NO. 

INCANDESCENT 

LAMP 

LEGEND DISPLAY 

All types Except 7 

2/ 

MIL-PRF- 

22885 

INCANDESCENT 

LAMP 

OR LED 

TABLES 

LEGEND DISPLAY 

NIGHT VISION GOGGLE 

(NVG) COMPATIBILITY 

Types 7 Only 

(AVAILABLE PER /112 ALSO) 

MIL-PRF- 

22885 

HIGH 

BRIGHTNESS 

LED 

LEGEND 

DISPLAY 

Types 0, 1, 4, 5 

& 6 

2/ 

MIL-PRF 

22885/112 

COLOR 

/101 

SYMBOL 

COLOR 

/101 

SYMBOL COLOR 

0 White W NVIS Blue White 

1 Red R NVIS Red L Red 

2 Green G NVIS Green B J Green 

3 

Aviation 

Yellow 

Y 

NVIS Yellow 

Class B 

K 

Aviation 

Yellow 

4 

Lunar 

White 

D NVIS White --- 

5 

Lemon 

Yellow 

-- 

NVIS Yellow 

Class A 

K 

Lemon 

Yellow 

6 Blue 3/ B NVIS Green A H Blue 

7 

Aviation 

Green 4/ 

Z --- --- --- 

NOTES: 

1 All NVIS filters availability per MIL-STD-3009 are subject to 

final R&D test results. 

2/ Colors of incandescent lamp and High Brightness LED are 

slightly different. 

3/ May not be suitable for high intensity light applications. 

4/ For types 2, 3, 4, 5, 8, and 9 use 90-CODED/016. 

Table 9 – Rear Flange Mount 

Dimensions & Panel Cutouts 

In Inches In Millimeters 

NUMBER 

OF UNITS 

MATRIX 

DIMENSIONS 

CUTOUT 

DIMENSION 

ON SIDE A OR B C OR D 

± .015 +.03 -.00 

1 .755 .77 

2 1.510 1.53 

3 2.265 2.28 

4 3.020 3.04 

5 3.775 3.79 

6 4.530 4.55 

N .755 x N .76 x N 


NUMBER 

OF UNITS 

MATRIX 

DIMENSIONS 

CUTOUT 

DIMENSION 


± .38 +.8 -.0 

1 19.18 19.6 

2 38.35 38.9 

3 57.53 57.9 

4 76.71 77.2 

5 95.89 96.3 

6 115.06 115.6 

N 19.18 x N 19.3 x N 

57

Table 10 – Front Dress Bezel Mount 

Dimensions & Panel Cutouts 

NUMBER 

OF UNITS 

MATRIX 

DIMENSIONS 

CUTOUT 

DIMENSION 


± .015 +.030 -.000 

58 

1 .755 1.124 

2 1.510 1.879 

3 2.265 2.634 

4 3.020 3.389 

5 3.775 4.144 

6 4.530 4.899 

N .755 x N A or B + N 

TABLES 

In Inches In Millimeters 

NUMBER 

OF UNITS 

MATRIX 

DIMENSIONS 

CUTOUT 

DIMENSION 


± .038 +.76 -.00 

1 19.18 28.55 

2 38.35 47.73 

3 57.53 66.90 

4 76.71 86.08 

5 95.89 105.26 

6 115.06 124.43 

N 19.18 x N A or B + 9.37

ACCESSORIES DIMENSIONS & OTHER - MODEL PRODUCTS 

99 

Crimp Pin Tool and Positioner 

• Attaches female crimp pins to #20-24 stranded wire 

• For Models 95 or 97 Matrix Housing or Models 98 or 99 Individual Mount 

• Specify part number 15191 for M22520/2-01 Crimp Tool for use 

with Long Crimp Pins part number 15095 

• Specify part number 15192 for M22520/2-14 Turret for use with Long 

Crimp Pins part number 15095 

• Specify part number 15278 for M22520/2-01 Crimp Tool for use with Short Crimp Pins part number 15276 

• Specify part number 15279 for M22520/2-14 Turret for use with Short Crimp Pins part number 15276 

Socket Contact Crimp Pins 

• Used for connection to #20-24 stranded wire for Models 95, 97, 98 or 99 

• Specify part number 15095 for M39029/16-168 Female Crimp Pins for Long 

Crimp Pins Receptacles 

• Specify part number 15276 for M39029/22-192 Female Crimp Pins for Short 

Crimp Pins Receptacles 

Insulator Plugs 

• Close off unused terminal openings in termination receptacles for models 95, 97, 98 or 99 

• Specify part number 15177 for MS27488 Insulator Plugs 

Pushbutton Extractor Tool 

• Facilitates removal of display pushbuttons 

• Specify part number 15193 

Matrix Switch Extraction Tool 

• Facilitates removal of Switch/Indicator from matrix housings 

• Remove pushbutton; loosen two locking cams; insert tool from 

front of assembly; screw looped handle to tighten 

rubber block; pull to remove 


Crimp Pin Termination Receptacles 

Matrix Mount 

• Receptacles supplied with models 95 and 97 Matrix housings 

• Additional receptacles may be ordered separately, as replacement parts 

• Specify part number 15096 for Long Crimp Pin Receptacle 

• Specify part number 15280 for Short Crimp Pin Receptacle 

Individual Mount 

• Receptacles supplied with models 98 and 98 Switch/Indicator 

• Additional receptacles may be ordered separately, as replacement parts 

• Specify part number 15197 for Long Crimp Pin Receptacle 

• Specify part number 15273 for Short Crimp Pin Receptacle 

59

Pushbutton Guard 

• Lift to allow switch actuation 

• Prevents accidental actuation 


60 

ACCESSORIES MODEL 99 SWITCH/INDICATOR 

& OTHER PRODUCTS 

• Pushbutton guard is transparent and spring loaded 

• Slips over switch housing 

• Minimum panel spacing required .871” (22.1 mm) 


Metal Pushbutton Guard 

• Lift to allow switch actuation, spring loading ensures that cover will close after actuation 

• Rigid metal guard prevents accidental actuation for critical systems in challenging 

environments 

• Pushbutton guard is an open metal ‘cage’ that does not restrict the view of the 

pushbutton legend 

• Easily slips over switch housing when switch is installed 

• Minimum panel spacing required is .871” (22.1 mm) 


Pushbutton Retainer Tie 

• Retainer Tie secures pushbutton to switch/indicator assembly, eliminat- 

ing pushbutton mix-up during relamping 

• Allows pushbutton to be relamped from front panel 

• Supplied with models 93 or 99 Switch/Indicator with display pushbutton 

assemblies when ordered in “retained pushbutton” configuration 

• To order separately, specify part number 15093 

Dummy Lamp 

• Substitute for a T-1 flange base lamp 

• Must be installed to maintain uniform actuation force when all lamps not installed 


Dress Bezel Mounting Cleat Assembly 

• Required for installing models 96 and 97 matrix housings 

• Quantity supplied as standard parts depending on housing 

size, refer to figure 55, page 30 

• Additional cleat assemblies packaged 5 per envelope, specify part number 15098 

• For printed circuit board mounting application, use shorter slotted fillister head cleat, part 

number 15213 

Panel Seal 

• Converts unsealed model 91 switch to a sealed unit 

• As a replacement or for conversion 

• Packaged 10 per envelope

ACCESSORIES DIMENSIONS & OTHER - MODEL PRODUCTS 99 

Insertion and Removal Tool 

• Used for inserting or removing connector wire with Crimp Pin attached 

• Specify part number 15190 for M81969/16-01 Tool 

Color Filter Caps 

• Allows changing pushbutton cell area colors 

when using incandescent lighted display types 

2,3,4,5,8, and 9 

• For use with model 92 and T-1 flange based 

lamps, not used with LED lighting. 

• Kits contain 25 pieces of given color 

• Specify part number below 

Single Lamp Switch/Indicators 


• QPLs M22885/18, M22885/19 and M22885/99 

• 2 circuit 2PDT; 2A resistive, 1.5 A inductive, 28 VDC/115 VAC 

• Momentary or alternative switch action or indicator 

• Pushbutton display lens has seven display types in six colors 

• Request catalog GC-6/4 

Series C8/C8P 

• Commercial equivalent to model 60 

• 2 circuit 2PDT; 3A resistive, 28 VDC/115 VAC 

• Momentary or alternate switch action or indicator 

• Pushbutton display lens has seven display types in six colors 

• Model C8 has bezel mount, C8P has snap dress bezel mount 


Unlighted Switches 


• M8805/99 QPL listed pushbutton switch 

• 2 circuit 2PDT; 3A resistive, 1.5 A inductive, 28 VDC/115 VAC 

• Momentary or alternate switch action 

• Pushbutton in either red or black with black dress ring 

• Panel seal dress ring, makes switch panel opening moisture tight 


15194-X 

Color 

0 Clear, Transparent White 

1 Red 

2 Green 

3 Aviation, Yellow 

4 Lunar White 

5 Lemon Yellow 

6 Blue 

7 Aviation Green 

Basic Part Number 

61

62 

ACCESSORIES MODEL 99 SWITCH/INDICATOR 

& OTHER PRODUCTS 

Series 80 Sunlight Readable Display Switches 

• Lighted legend is clearly legible even in 10,000 footcandle light 

• Uniform lighting, no hot spots even when dimmed for night viewing 

• Dead front hidden legend, avoids false energized appearance 

• Individual or Matrix mount, 4PDT and 2PDT or indicator 

• Momentary, alternate or solenoid held 


Series 50 Dripproof Display Switches 

• For applications exposed to rain, open deck spray, or condensation 

• Meets or exceeds MIL-STD-108 of MIL-S-22885 

• Captive rubber pushbutton seal closes moisture paths into switch 

• Legend area is not covered by seal so lighted message remains 

bright and clear 

• Request Staco Systems Catalog GC-6/7 

Series 40 QPL and Industrial Display 

• M22885/52, /53, /56, /86, /95 

• Standard lighted displays 

• Individual or matrix mount 

• Momentary, alternate action, latchdown and solenoid held 

• Four and two pole switches and indicators 

• Square or rectangular 

• Solder, PC Wirewrap or Crimp Pin termination 

• Matrix mount with crimp pin terminations qualified to MIL-S-24317/9 and 

MIL-S-24317/10 

• Request Staco Systems Catalog GC-6/2 

Digital Dimmer 

For dimming of both LED and incandescent devices 

• LED and incandescent dimming 

• 16 levels of brightness control 

• Full brightness 

• Full blank lamp test 

• Remote Up/Down input 

• 4 bit digital input 

• Sourcing or sinking 

• Full MIL spec construction 

• Specify part number DDM111 OR DDM111A

Models 91, 92 & 98 

ORDERING SECTION INFORMATION 

HEADS 

The tables not only identify the code numbers associated with each option, but also supply additional information 

relating to the option. The convention for notes is that a number followed by a period (i.e., 1.) is a general note and 

the text which follows applies to the entire table. Whereas a specific note refers only to the item with the corresponding 

symbol (i.e., 2 ) in a manner similar to a “delta note” on a drawing. 

The term “sealed” for switches and pushbuttons in the following tables are for “dripproof” seals (to withstand a spray of five 

gallons in five minutes). For “splashproof”, “immersion” and “solvent-resistant” seals, see the section beginning on page 20.) 

To have a dripproof unit, both the switch and the pushbutton should be ordered as “sealed”. All Type 7 display 

pushbuttons, NVIS compatible, are configured as sealed units. 

Model 91 Switch/Indicator Without Pushbutton 

Model 92 Pushbutton 


63

64 

ORDERING SECTION INFORMATION 

HEADS 

Model 98 Switch/Indicator Without Pushbutton 

Models 93 & 99 

Each of the standard and optional features of the Series 90 Switch and Indicator are described in this catalog. The 

part numbering rationale provides for ordering a complete switch or indicator assembly with a pushbutton assembly, 

including illumination source, legend, colors, and display style. Individual switch or Indicator assemblies and individual 

pushbuttons may also be ordered separately. 

To determine the type of switch or indicator and push-button you need, simply insert the code numbers from Tables 1 

through 8, as outlined in the following pages, in the appropriate locations in the part number listed with the charts. 

Model 98 Switch/Indicator is supplied with a crimp pin termination receptacle installed. To designate the type of 

switch or indicator required simply insert the appropriate code numbers from Tables 1, 2, and 3 on pages 12 and 13. 

The Model 99 includes a Switch/Indicator and a Display Pushbutton. To designate a complete Model 99 assembly, 

insert the code numbers from Tables 1-8. The associated crimp pins are not furnished with each part, but may be 

ordered separately as part number 15095. 

The Model 93 configurator, shown below, provides the part number information to define switch and pushbutton 

assemblies. It is a 16-digit part number, with no spaces or hyphens, followed by the text for the display. 

Example: Following the code number 93, the next four sets of digits, from Tables 1 through 4, define the switch portion 

of the assembly. The rest of the part number, from Tables 5 through 8, defines the display pushbutton. The color 

for each of the four quadrants must be included, even if they are all the same color in a full-screen display. 

The convention for legend text is to enclose the text for each area within parenthesis and to indicate a new line by 

inserting a semi-colon. In the example below, the Display Style (of Table 5) is a 42. This represents a three-way split 

with character height of .087 ". 

The top half has two lines, OIL and OK. The lower left quadrant has the text LO; the lower right quadrant has the 

text HOT. The quantity of parenthesis pairs corresponds to the area numbers identified in Table 5. The text for each 

area is enclosed by parenthesis. If one area is blank, a space would be inserted between the parenthesis, for example: 

(OIL;OK)(LO)( ).

ORDERING INFORMATION 

Model 93 and 99 Lighted Switch Assembly 

99 18 4 2 8 15 62 5 7777 (BRIGHT; LEDS) 

Customer Legend for Areas 1, 2, 3 and 4 

Table 8 Cell Color Code, page 57 

Table 7 Display Type, page 56 

Table 6 Lamp or LED Selection and Pushbutton Sealing, page 55-56 

Table 5 Display Style and Character Definition, page 54 

Table 4 Lamp or LED, Ground Options and EMI/RFI Status, page 53 

Table 3 EMI/RFI Sealing, page 53 

Table 2 Switch Action and Pushbutton Retainer, page 51 

Table 1 Terminations, No. of Poles and Contact Material, page 50 

Model 99 Switch/Indicator with Pushbutton Assembly 


65

Watertight Seals 

66 

ORDERING INFORMATION 

The Watertight Seal option is specified by adding /005 to the coded part number. In the following part numbers the 

Xs represent the digits of the coded part number for a similar assembly without this seal option. 

Switch Indicator Assembly 91XXXX/005 

Switch Indicator Assembly 98XXXX/005 

Pushbutton Assembly 92XXXXXXXXXX/005 

Switch Indicator Assembly with Pushbutton 93XXXXXXXXXXXXXX/005 

Switch Indicator Assembly with Pushbutton 99XXXXXXXXXXXXXX/005 

Text for legends, when applicable, follows the /005. An example using the Model 99 would be as follows: 

9917418156257777/005 (Bright; LEDs) 

Switches, indicators and pushbuttons cannot be reworked in the field to retrofit existing equipment with the Watertight 

Seal. All applications requiring the use of the watertight seal must use factory supplied and assembled hardware. 

A switch/indicator service kit is offered which contains ten sets of panel seals and retainers. This kit, P/N: 

15196/005, can be used to replace damaged or misplaced hardware. 

Matrix assemblies utilizing Series 90 switches cannot make use of this watertight seal. Customer replaceable 

legends (Pushbutton Types 8 and 9) are not available with watertight seals. 

Front Dress Bezel Mount

Rear Flange Mount 

Complete Systems 

ORDERING DIMENSIONS INFORMATION - MODEL 99 

When ordering complete systems…matrix housing, switch/indicator, 

and pushbuttons…an Assembly Part Number will be assigned by the 

factory to cover the complete system. 

Each station within the matrix (fig. 48) must be identified with a specific 

switch or indicator part number and pushbutton assembly part number. 

Each station in the matrix (fig. 47) is identified by a digit-dash-digit 

number, called a Location Code. 

The first digit in the Location code identifies the hori- 

zontal row and the second digit identifies the vertical 

column. In the example 2-3 is the second row down 

and the third 

column to the right. Location 1-1 will always be top 

left as viewed by the operator. Pre-numbered work 

sheets are available from the factory upon request. 

Figure 59 


Figure 60 

67

1139 Baker Street • Costa Mesa, CA 92626-4191 

714-549-3041 • Fax: 714-549-0930 • www.stacosystems.com

Series 90 Lighted Pushbutton Switches - Staco Systems

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