A.O.Smith Motor Catalog - Universal Electric Motors

Century® Multi-Speed • Three Phase MotorsDripproof - Rigid Base - Two SpeedVariable Torque - 1/.44 thru 40/18 HPFeatures:• Ball Bearings• 60 Hz• 40˚C Ambient• Class B or F Insulation• Service Factor 1.15Applications:For two-speed, one and two winding, variable torque applications for speed control from one speed to another while under load.Blowers, fans, conveyeors, mixing machines, centrifugal pumps.M312Oper. HP Oper. HP Full Load Stock Insulation “C” High Spd. Low Spd.HP Volts High Spd.* Low Spd.* Amps Frame Number Class Dim. Efficiency Efficiency NotesTwo Speed 1800/1200 RPM • Two Winding • Variable Torque1~.44 460 1 .30 1.7/1.1 145T M109 B 12.6 74.0 60.0 211.5~.68 200-230 1-1⁄2 .44 5.0-4.9/2.9-2.8 145T M125 B 13.1 71.0 80.0 21460 1-1⁄2 .44 2.4/1.4 145T M104 B 13.1 75.0 71.0 212~.88 200-230 2 .59 6.4-6.1/3.8-4.1 182T M220 B 12.6 81.0 72.0460 2 .59 3.0/2.0 182T M207 B 12.6 80.0 70.03~1.3 200-230 3 .89 9.0-8.4/4.8-4.8 184T M221 F 12.6 81.0 75.0460 3 .89 4.6/2.6 184T M208 B 12.6 82.5 74.05~2.2 200-230 5 1.48 16.0-15.5/9.7-10.2 215T M320 B 15.6 86.0 78.0460 5 1.48 7.1/4.8 215T M305 B 15.6 78.0 71.07.5~3.3 200-230 7-1⁄2 2.22 22.0-19.5/12.3-12.3 215T M317 F 18.3 89.0 85.0460 7-1⁄2 2.22 10.0/6.0 215T M315 F 16.6 87.0 80.010~4.4 200-230 10 2.96 27.0-24.0/14.5-13.0 256T M421 F 22.1 88.0 80.0460 10 2.96 12.0/6.3 256T M413 F 22.1 87.0 82.015~6.7 200-230 15 4.40 40.0-36.0/20.0-19.0 284T M521 F 24.3 86.0 85.0460 15 4.40 18.0/9.5 256T M423 F 22.1 86.0 81.020~8.9 200-230 20 5.93 54.0-48.0/28.0-26.0 286T M522 F 24.3 89.0 86.0460 20 5.93 24.0/13.0 286T M504 F 24.2 90.0 84.025~11 460 25 7.40 29.0/17.5 286T M515 F 24.3 91.0 86.030~13.3 460 30 8.90 36.0/18.5 286T M514 F 24.3 91.0 88.0Notes:21. Terminal in bracket construction326. Cast Iron*The operating horsepower is based on the type load where the horsepower requiredvaries as the cube of the speed. Examples of such loads are fan or blower systemsand centrifugal pumps.Two-speed motor performance data sheets are available fromyour A. O. Smith Customer Service Center.Continues on next page190 www.aosmithmotors.com