Speedfax 2017

Medium-voltage Equipment
Types GM-SG and GM-SG-AR
Stacking Versatility
Stacking versatility continued
GM-SG-AR arc-resistant 63 kA -
1,200 A
circuit
breaker
1,200 A
circuit
breaker
Auxiliary
1,200 A
circuit
breaker
2,000 A
circuit
breaker
2,000 A
circuit
breaker
A
A
D
A
A
A
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
1,200 A
circuit
breaker
B
Auxiliary
B
1,200 A
circuit
breaker
B
2,000 A
circuit
breaker
B
1,200 A
circuit
breaker
B
2,000 A
circuit
breaker
B
14 SWITCHGEAR
Auxiliary
2,000 A
circuit
breaker
Vented 7
Fan 7
Auxiliary
D
A
A
A
A
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
Low-voltage
panel
2,000 A
circuit
breaker
Auxiliary
3,000 A 7
circuit
breaker
3,000 A 7
circuit
breaker
Auxiliary
B
B
B
B
B
Footnotes for GM-SG-AR arc-resistant 63 kA:
1. Main bus sizes 1,200 A, 2,000 A, 3,000 A or 4,000 A (self-cooled).
No rollout auxiliaries allowed in upper cell (A) if lower cell (B) has 3,000 A circuit breaker.
Auxiliary cells (A or B) may each contain one rollout (except as indicated in Footnotes 2 and 7).
Fuse rollout for stationary CPT must be located in lower rollout cell B, if CPT is located in rear or is remote.
Stacking arrangements are available as shown for arc-resistant type GM-SG-AR equipment rated 63 kA. Total circuit breaker loading in a vertical unit may not exceed main bus rating.
Consult Siemens for specific application assistance regarding total load limits in each unit or refer to ANSI/IEEE C37.20.2.
Generator circuit breakers (type GMSG-GCB) conform to same stacking rules as standard (nongenerator) circuit breakers.
For fan-cooled 4,000 A rating, circuit breaker (3,000 A self-cooled, 4,000 A fan-cooled) may be located in lower cell (B) with fan cooling in cell A.
Siemens Industry, Inc. SPEEDFAX Product Catalog 14-11