Siemens 3AK Operating Instructions Manual page 26

Description
CLOSED switching posi-
OPEN switching position
Fig. 26 Locking the withdrawable section
26
Locking the vacuum circuit-breaker
A sensing and actuation component in the cartridge insert detects the operating
position (CLOSED/OPEN) of the vacuum circuit-breaker.
If the vacuum circuit-breaker is closed, actuation of the system's sensing and actu-
tion ation component in the cartridge insert is prevented. A mechanical system in the
switchgear truck or withdrawable section reliably blocks movements of the with-
drawable part on the switchgear truck or withdrawable section.
If the vacuum circuit-breaker is open, the sensing and actuation component in the
cartridge insert actuates the vacuum circuit-breaker's mechanical locking device
and reliably blocks closing of the vacuum circuit-breaker.
Locking device of the cartridge insert
When the unlocking lever (95.) is fully folded down, the cartridge insert is locked in
the switchgear by the locking pins projecting from the side (93.) With this the with-
drawable part is enabled for moving.
Locking device for the actuating openings (optional)
The locking magnets Y8 (102.) and Y10 (103.) are used to electrically lock the actu-
ating openings in the switch cabinet door. As a result the actuating openings for
manually operating the earthing switch (96.) and the withdrawable part (98.) are no
longer accessible.
Fig. 27 Locking the actuating openings
9229 9923 176 0B
2013-09-09