Siemens vacuum circuit breaker 38-3AH3 38 kV - Manual (Page 22)

When the closing spring has been fully
charged, the crank actuates the linkage
(55.1) via control lever (55.2) for the
closing-spring CHARGED indicator (55.0),
and actuates the limit switches (50.4.1) for
interrupting the motor supply.
At the same time, the lever (62.5) at the
other end of the charging shaft is securely
locked by the close-latch pawl (62.5.2).
When the closing spring is being charged,
cam disc (62.3) follows along, and it is
brought into position for closing when the
closing spring is fully charged.
Vacuum interrupter/
operator
Closing
Refer to Figure 15: Stored-energy
operating mechanism on page 20, Figure
16: Use of manual-spring operating crank
on page 22, Figure 17: Operating
mechanism section diagram (drawout trip-
free linkage shown) mechanism OPEN,
closing spring DISCHARGED on page 24,
Figure 18: Operating mechanism section
diagram (drawout trip-free linkage shown)
mechanism OPEN, closing spring
DISCHARGED on page 25, Figure 19:
Operating mechanism section diagram
(drawout trip-free linkage shown)
mechanism CLOSED, closing spring
DISCHARGED on page 26 and Figure 20:
Operating mechanism section diagram
(drawout trip-free linkage shown)
mechanism CLOSED, closing spring
CHARGED on page 27.
If the circuit breaker is to be closed locally,
the closing spring is released by pressing
the close button (53.0). In the case of
electrical control, the spring-release coil
52SRC (53.1) unlatches the closing spring.
As the closing spring discharges, the
charging shaft is turned by crank (62.2).
The cam disc (62.3) at the other end of the
charging shaft actuates the drive lever
(62.6), with the result that the jack shaft
(63.0) is turned by lever (63.5) via the
coupling rod (62.8).
At the same time, the levers (63.1), (63.5)
and (63.7) fixed on the jack shaft operate
the three-insulated couplers for the circuit-
breaker poles.
Lever (63.7) changes the OPEN/CLOSED
indicator (58.0) to CLOSED. Lever (63.5)
charges the tripping spring (64.0) during
closing, and the circuit breaker is latched
in the CLOSED position by lever (64.3) with
pawl roller (64.3.1) and by pawl (64.2).
Lever (63.1) actuates the auxiliary switch
through the linkage (68.1).
The crank (62.2) on the charging shaft
moves the linkage (55.1) by acting on the
control lever (55.2). The closing-spring
CHARGED indication (55.0) is thus
canceled and, the limit switches (50.4.1)
switch in the control supply to cause the
closing spring to recharge immediately.
Figure 16: Use of manual-spring operation crank
50.1
50.0
55.0
53.0
54.0
50.0 - Hand crank
50.1 - Manual-spring charging port
53.0 - Manual close button
54.0 - Manual open (trip) button
55.0 - CHARGED/DISCHARGED indicator
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