Inspection and maintenance
5.4 Performing inspection
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
397
5.4.7 Testing of mechanical and electrical function of internal accessories
NOTICE
Incorrect auxiliary power supply can damage internal accessories.
The electrical functions of the internal accessories may only be tested with control
voltage.
Ensure that the rated control voltage level is applied to the internal accessories.
Note
The test routines of the accessory components are 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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