Siemens SENTRON 3WL10 - Cleaning and Lubricating the Tripping Mechanism; Inspecting the Accessories

7.5.2 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.
7.5.3 Inspecting the accessories
1. Check that the accessories are 󹪝rmly 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.
Service and maintenance
7.5Basic unit and accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 203