Siemens 3AH4, Operating Instructions Manual

Page: 31 / 66

Description
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2013-08-28
Spring charge release
The springcharge release (72.) is an assembly that prevents removing the plug
(68.7.1) from the vacuum circuit-breaker when it is closed.
Fig. 40 Spring chargerelease
The lever (72.1) of the spring charge release on the mechanism box locks the lever
of the plug in idle position (a).
When the lever of the springcharge release is brought into operating position (b),
opening is reliably done via the mechanics of the vacuum circuit-breakers and the
closing latch is cancelled.
A no-load switching operation is done in the course of this.
Only now is it possible to undo the plug of the low-voltage interface.
a)
b)
a) Idle position – CLOSED switching position
b) Operating position – OPEN switching position
68.7 Low-voltage interface
68.7.1 Plug
72. Spring chargerelease
72.1 Lever of the springcharge release
Note
The spring charge release can also be combined with a mechanical locking
device.