Inspection & Maintenance
4.4 Performing inspection
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
173
4.4.5 Testing of mechanical function of the withdrawable circuit breaker and the
guide frame
The inspection of the withdrawable circuit breaker also includes all the items in Section
Testing of mechanical function of the circuit breaker (Page 172).
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
4.4.6 Testing of auxiliary circuits
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.
To Next Page
Loading...
