Siemens SGIM-3268H - Page 50

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Appendix
Table A-1B – Type GMI Circuit Breaker Ratings (New ”Constant kA” Rating Basis)
These ratings are in accordance with the following standards:
ANSI C37.04-1999 Standard Rating Structure for AC High-Voltage Circuit Breakers
ANSI C37.06-2000 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis—Preferred Ratings and
Related Required Capabilities
ANSI C37.09-1999 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis
ANSI C37.010-1999 Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis
Rated Values Units 5- 5- 5- 7- 15-GMI- 15-GMI- 15-GMI- 15-GMI-
GMI-31 GMI-40 GMI-50 GMI-40 25 31 40 50
Maximum Design Voltage (V)
1
kV rms 4.76 4.76 4.76 8.25 15.0 15.0 15.0 15.0
Voltage Range Factor (K)
2
— 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Power
Withstand Frequency
Kv rms 19 19 19 36 36 36 36 36
Voltage Levels Lightning kV
Impulse (BIL) crest
60 60 60 95 95 95 95 95
1200 1200 1200 1200 1200
Continuous
3
A rms
1200
2000 2000 2000
1200 1200
2000 2000
2000
3000
3
3000
3
3000
3
2000 2000
3000
3
3000
3
Short-Circuit (I)
4 5
kA rms
31.5 40 50 40 25 31.5 40 50
sym
Interrupting Time
ms 83(5) 83(5) 83(5) 83(5) 83(5) 83(5) 83(5) 83(5)
Cycles
Permissible Tripping Delay (Y) Sec 2 2 2 2 2 2 2 2
kA rms
Max Sym Interrupting (I)
sym
31.5 40 50 40 25 31.5 40 50
% dc Component % 47 47 47 47 47 47 47 47
Short-Time Current (I), 3 seconds kA rms 31.5 40 50 40 25 31.5 40 50
Closing & Latching (Momentary)
Asymmetrical (1.55 x I)
kA rms 49 62 78 62 39 49 62 78
Closing & Latching (Momentary) kA
Peak (2.6 x I) peak
82 104 130 104 65 82 104 130
Circuit Breaker Type
Footnotes
1
Maximum voltage for which the circuit breaker is designed, and the upper limit for operation.
2
K is listed for informational purposes only. For circuit breakers rated on a “kA basis”, the Voltage Range Factor is 1.0.
3
3000A ratings with VS-10028 vacuum interrupter are self cooled for indoor installations. 3000A ratings using VA-
15050 vacuum interrupter and sperate phase barriers require supplemental fan-cooling in the switchgear circuit
breaker structure. 3000A ratings using VS-15050 vacuum interrupter and chair design support are self-cooled for
indoor installations. Consult drawings for the switchgear for arrangement provided.
4
All values apply to polyphase and line-to-line faults.
5
Standard duty cycle is O – 0.3s – CO – 15s – CO.
Courtesy of NationalSwitchgear.com