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