Service and maintenance
7.6 Final tests
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
217
1. Mount all removed parts and covers on the circuit breaker again.
Proceed as shown in the Section Removing the front plate and accessories (Page 214) in
the reverse order.
2. Reconnect the terminals for auxiliary supply connection (if required).
3. Withdrawable breaker only: Move the circuit breaker into the TEST position.
4. Perform the following operations ten times using the relevant accessories (including via
remote access, if available):
– Open
– Close
– Trip with the test button on the ETU
Perform the operations in the following order:
– Open - spring discharged
– Open - spring charged
– Close - spring discharged
– Close - spring charged
5. Check whether the following modules respond correctly (if available):
– Accessories
– Spring charging motor MO
– Undervoltage release UVR
– Auxiliary solenoids (closing coil (CC) / shunt release (ST))
– Auxiliary switches and signaling switches
– Locking and interlocking devices
Note
For withdrawable breaker only: Interlocking devices cannot be tested in the breaker
positions DISCONNECT and TEST.
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