Inspection & Maintenance
4.4 Performing inspection
3WJ Air Circuit breakers
174 Operating Instructions, 12/2022, L1V30828903001-01
4.4.7 Testing of mechanical and electrical function of internal accessories
Damage to accessories
Incorrect auxiliary power supply can damage internal accessories.
The electrical functions of the internal accessories may only be tested with auxiliary voltage.
Ensure that the rated auxiliary voltage level is applied to the internal accessories.
The test routines of the accessory components are generally described in the relevant
operating instructions.
Check the following items:
• Electrical function, e.g. of:
– Shunt trip, undervoltage release and closing coil
– Auxiliary switch
– Signaling switch
• Mechanical functions for auxiliary releases:
– Free movement of armature
Ensure that the armature moves back to its initial position when no voltage is present.
• Smooth running of armature of auxiliary releases
• Function of locks
• Function of interlocks
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