Inspection & Maintenance
4.5 Preparation for maintenance work
3WJ Air Circuit breakers
178 Operating Instructions, 12/2022, L1V30828903001-01
4.5 Preparation for maintenance work
Observe the instructions in Chapter Safety regulations (Page 167).
1. Open the door of the control cabinet.
Follow the instructions in the operating instructions for the relevant interlock to bypass an
optionally installed interlock.
2. Open the circuit breaker and discharge the stored-energy spring.
– Press O / OPEN.
– Isolate the auxiliary circuits by unplugging the manual connectors.
– Press I / CLOSE.
A charged stored-energy spring is discharged.
– Press O / OPEN.
– Ensure that the switch position indicator shows OPEN.
The circuit breaker is open.
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