Siemens GMSG-GCB

17
Figure 11: Type GMSG vacuum circuit breaker
Figure 12: Interrupter/operating mechanism module
Construction
Refer to Figure 12: Interrupting/operating
mechanism module on page 17, Figure 13:
Operating mechanism controls and indicators
on page 18, Figure 14: Type GMSG vacuum
circuit breaker pole section on page 19 and
Figure 15: Stored-energy operating
mechanism on page 20.
Each of the circuit breaker poles is fixed to the
rear of the operating-mechanism housing
(60.0) by cast-resin insulators (16.0).
The insulators also connect to the upper
(20.0) and lower (40.0) pole-supports that in
turn support the ends of the vacuum
interrupter (30.0). Primary stud-extensions
are attached directly to the upper pole-
support (20.0) and lower terminal (29.0).
The energy-storing mechanism and all the
control and actuating devices are installed in
the mechanism housing (60.0). The
mechanism is of the spring-stored energy-
type and is mechanically and electrically trip-
free.
The OPEN/CLOSED indicator (58.0),
CHARGED/DISCHARGED indicator (55.0) and
the operations counter (59.0) are located on
the front of the mechanism housing (60.0).
Shown with outer-phase barriers removed
Shown with outer-phase barriers installed
16.0
Insulator
20.0
Pole head
29.0
Lower connection terminal
30.0
Vacuum interrupter
40.0
Pole bottom
60.0
Operator housing
16.0
16.0
20.0
30.0
60.0
40.0