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Vacuum interrupter/operator
Figure 8: Front view of type GMSG vacuum circuit breaker with front panel removed
1
Closing spring
2
Gearbox
3
Opening spring
4
Push-to-close
5
Auxiliary switch
6
Close coil
7
Trip coil
8
Push-to-trip
9
Mechanism-operated cell
(MOC) switch operator
10
Closed circuit breaker
interlock
11
Trip-free interlock
12
Operations counter
13
Ground disconnect
14
Capacitor trip (optional) (not
shown)
15
Jack shaft
16
OPEN/CLOSED indicator
17
CHARGED/DISCHARGED
indicator
18
Spring-charging motor
19
Secondary disconnect
14
19
1
17
16
15
12
14
13
Introduction
The type GMSG and type GMSG-GCB vacuum
circuit breakers are of drawout construction
designed for use in medium-voltage, metal-
clad switchgear. The GMSG (not GMSG-GCB)
circuit breaker conforms to the requirements
of ANSI and IEEE standards, including
C37.20.2, C37.04, C37.06, C37.09 and
C37.010. The GMSG-GCB conforms to the
requirements of ANSI and IEEE standards,
including C37.20.2 and C37.013.
4
2
6
7
3
8
18
11
10
A type GMSG vacuum circuit breaker consists
of three vacuum interrupters, a stored-energy
operating mechanism, necessary electrical
controls and interlock devices, disconnect
devices to connect the circuit breaker to both
primary and control power and an operator
housing. Insulating barriers are located along
the outer sides as shown in Figure 11: Type
GMSG vacuum circuit breaker on page 17.
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9
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