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.
Service and maintenance
7.6Final tests
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 205
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