Description
2.2 Circuit breakers and non-automatic circuit breakers
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
43
2.2.4.4 Commissioning checklist
Checks and work to be carried out
Before commencing work on the device, observe the safety instructions in Chapter Safety
instructions (Page 17).
1. Open the circuit breaker and discharge the stored-energy spring.
2. Pull out the racking handle (for withdrawable circuit breakers).
3. Move the circuit breaker to the test position (for withdrawable circuit breakers).
4. Press the red reset buttons to reset the mechanical reclosing lockout.
5. Connect the auxiliary voltages.
6. Set the parameters on the electronic trip unit.
7. Assign the bus addresses for the communication modules.
8. Check the bus wiring and the terminating resistor.
9. Perform a communication test.
10. Test the auxiliary functions.
11. Close the control cabinet door.
12. Move the circuit breaker to the connected position (for withdrawable circuit breaker).
13. Insert the racking handle (for withdrawable circuit breakers).
14. Charge the stored-energy spring.
Conditions for ready-to-close status (depending on equipment with accessories)
The following conditions must be fulfilled for the ready-to-close status:
Undervoltage release:
energized (auxiliary voltage
Mechanical circuit breaker interlocking
Observing status displays
The circuit breaker is ready for closing when the READY window displays OK. It can then be
closed manually or by means of a control command.
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