Service and maintenance
11.1 Preventive measures
3VL molded-case circuit breakers
142 System Manual, 03/2009, 110 0110 - 02 DS 01
● Check connections are tight
– Check the terminal screws for proper torque values
– Spot checking of input and output cables
– Spot checking of terminal accessories
– Replace damaged terminal accessories after cleaning the terminal area
● Check, and, if necessary, correct, the settings of the electronic overcurrent trip unit in
accordance with the system conditions
– Electronic circuit breaker releases must only be tested with a device especially
supplied for this purpose.
The operator (customer) must arrange for the disposal of the molded-case circuit breaker or
the replaced parts at the end of their service life in accordance with the currently applicable
legal requirements and guidelines.
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