64
Circuit breaker type
1
Maximum
design voltage
(V)
2
Voltage range
factor (k)
3
Withstand voltage levels Continuous current
4
Short-circuit
(I)
5, 6
Interrupting
time
7
kV rms
Power
frequency
kV rms
Lightning
impulse (BIL)
kV peak
A rms kA rms sym ms/cycles
5-GMSG-40-xxxx-104 4.76 1.0 19 60 1,200, 2,000, 3,000, 4,000FC 40 83/5
5-GMSG-50-xxxx-130 4.76 1.0 19 60 1,200, 2,000, 3,000, 4,000FC 50 83/5
5-GMSG-63-xxxx-164 4.76 1.0 19 60 1,200, 2,000, 3,000, 4,000FC 63 83/5
7-GMSG-40-xxxx-104 8.25 1.0 36 95 1,200, 2,000, 3,000, 4,000FC 40 83/5
15-GMSG-25-xxxx-65 15.0 1.0 36 95 1,200, 2,000 25 83/5
15-GMSG-40-xxxx-104 15.0 1.0 36 95 1,200, 2,000, 3,000, 4,000FC 40 83/5
15-GMSG-50-xxxx-130 15.0 1.0 36 95 1,200, 2,000, 3,000, 4,000FC 50 83/5
15-GMSG-63-xxxx-164 15.0 1.0 36 95 1,200, 2,000, 3,000, 4,000FC 63 83/5
Circuit breaker type
1
Permissible
tripping
delay (y)
Maximum
symmetrical
interrupting (I)
% dc
component
Short-time
current (I)
(three
seconds)
Closing and latching (momentary)
Sec kA rms sym % kA rms
Asymmetrical
(1.55 x I)
kA rms
Peak
(2.6 x I)
kA peak
5-GMSG-40-xxxx-104 2 40 47 40 62 104
5-GMSG-50-xxxx-130 2 50 47 50 78 130
5-GMSG-63-xxxx-164 2 63 47 63 98 164
7-GMSG-40-xxxx-104 2 40 47 40 62 104
15-GMSG-25-xxxx-65 2 25 47 25 39 65
15-GMSG-40-xxxx-104 2 40 47 40 62 104
15-GMSG-50-xxxx-130 2 50 47 50 78 130
15-GMSG-63-xxxx-164 2 63 47 63 98 164
Table 13: Type GMSG vacuum circuit breaker ratings (new "constant kA" ratings basis)
These ratings are in accordance with:
ANSI/IEEE C37.04-1999 Standard
Rating Structure for AC High-
Voltage Circuit Breakers
ANSI/IEEE C37.06-2009 AC High-
Voltage Circuit Breakers Rated on a
Symmetrical Current Basis -
Preferred Ratings and Related
Required Capabilities for Voltages
Above 1,000 Volts
ANSI/IEEE C37.09-1999 Standard
Test Procedure for AC High-Voltage
Circuit Breakers Rated on a
Symmetrical Current Basis
ANSI/IEEE C37.010-1999 Application
Guide for AC High-Voltage Circuit
Breakers Rated on a Symmetrical
Current Basis.
Footnotes:
1.
“xxxx” in type designation refers to the
continuous current rating 1,200 A, 2,000
A or 3,000 A, as appropriate. The 4,000 A
fan-cooled rating is achieved using a 3,000
A circuit breaker, in combination with fan
cooling as indicated in Footnote 4.
2.
Maximum design voltage for which the circuit
breaker is designed and the upper limit for
operation.
3.
K is listed for information purposes only.
For circuit breakers rated on a "constant kA"
ratings basis, the voltage range factor is 1.0.
4.
4000FC indicates that fan cooling is
included in the switchgear structure for
this rating. 4000 A rating is not available in
outdoor equipment.
5.
All values apply to polyphase and line-to-
line faults.
6.
Standard duty cycle is O - 0.3s - CO - 3
min. - CO.
7.
Standard rating interrupting time is five-
cycles (83 ms). Optional rated interrupting
time of three-cycles (50 ms) is available
(except with 24 Vdc tripping).
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