Vacuum Interrupter/Operator - Siemens GMSG-GCB Instruction Manual

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
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19
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17
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15
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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.
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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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