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Nominal
voltage
Circuit breaker type
1
5-GMSG-250-xxxx-97
5-GMSG-350-xxxx-132
7-GMSG-500-xxxx-111
15-GMSG-500-xxxx-62
15-GMSG-750-xxxx-97
15-GMSG-1000-xxxx-130
Interrupting
Circuit breaker type
1
ms/cycles
5-GMSG-250-xxxx-97
5-GMSG-350-xxxx-132
7-GMSG-500-xxxx-111
15-GMSG-500-xxxx-62
15-GMSG-750-xxxx-97
15-GMSG-1000-xxxx-130
Table 15: Type GMSG vacuum circuit breaker ratings (historic "constant MVA" ratings basis)
66
Nominal
Maximum
three-phase
class
MVA class
voltage (V)
9
kV
MVA
4.16
250
4.16
350
7.2
500
13.8
500
13.8
750
13.8
1,000
maximum
Permissible
tripping delay
time
voltage (V)
11
(Y)
divided by K
Sec
83/5
2
83/5
2
83/5
2
83/5
2
83/5
2
83/5
2
Continuous
design
current
4
factor (K)
2
kV rms
A rms
4.76
1,200, 2,000
1,200, 2,000,
4.76
3,000, 4,000FC
1,200, 2,000,
8.25
3,000, 4,000FC
1,200, 2,000,
15.0
3,000, 4,000FC
1,200, 2,000,
15.0
3,000, 4,000FC
1,200, 2,000,
15.0
3,000, 4,000FC
Rated
Maximum
Short-time
design
symmetrical
current (K
interrupting
x I) (three
(K x I)
seconds)
7
(= V/K)
kV rms
kA rms sym
3.85
36
4.0
49
6.6
41
11.5
23
11.5
36
11.5
48
Voltage
range
Withstand voltage levels
3
Power
Lightning
----
frequency
impulse (BIL)
kV rms
kV peak
1.24
19
1.19
19
1.25
36
1.30
36
1.30
36
1.30
36
Closing and latching
(momentary)
Peak
kA rms
( 2.7 x K x I)
8
kA peak
36
97
49
132
41
111
23
62
36
97
48
130
Short-circuit
(at rated
maximum
design
voltage) (I)
5,
6, 10
kA rms sym
60
29
60
41
95
33
95
18
95
28
95
37
Asymmetrical
(1.6 x K x I)
8
kA rms
58
78
66
37
58
77
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