Inspection and maintenance
5.4 Performing inspection
3WA1 air circuit breaker
396 Equipment Manual, 02/2023, 92310000002-06
5.4.5 Testing of mechanical function of the withdrawable circuit breaker and
the guide frame
Note
The inspection of the withdrawable circuit breaker also includes all the items in Section
Testing of mechanical function of the circuit breaker (Page
395).
Check the following items:
• Guide frame and racking mechanism including position indicator
• Visual inspection of finger clusters for damage
• Reliable function of control gate
• Mechanical function:
– Racking of circuit breaker
– Opening of shutter
• Function of position signaling switch module
• Position indicator corresponds to actual position of circuit breaker
• Release of racking mechanism interlock in the defined positions
• Effectiveness of racking mechanism interlock in the intermediate positions
• Coding of the withdrawable circuit breaker and the guide frame
5.4.6 Testing of auxiliary circuits and of cables to external current sensors
Check the following items:
• Connections to the circuit breaker in accordance with circuit diagram:
– Secure fitting
– Correct terminal assignment
• Withdrawable version: Auxiliary supply connector with sufficient tolerance for
insertion in the guide frame. Always correct rigid or non-flexible wiring.
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