Service and maintenance
7.5 Basic unit and accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
215
Cleaning and lubricating the tripping mechanism
1. Clean the points shown in the diagram below.
In the case of severe contamination, you can use a cleaning agent such as
Henkel 273471, Chemma 18 or an equivalent cleaner.
2. Lubricate the opening and closing links and the shafts at the points shown below with
Mobilgrease 28 from EXXON MOBIL.
3. Make sure that the shafts of the opening and closing mechanism can be moved freely.
Inspecting the accessories
1. Check that the accessories are firmly seated in the circuit breaker.
2. Check correct connection between the circuit breaker and the accessories.
3. Make sure that any auxiliary solenoids are in a good condition:
– No increased wear
– No signs of overheating
– No cracks or damage
4. Check whether the mechanical operating cycles counter MOC (if installed) is functioning
correctly by tripping the circuit breaker.
5. Check the wear on the brushes of the spring charging motor.
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