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4.4
Performing inspection
4.4.1
General
NOTICE
Material damage resulting from relubrication
The circuit breaker mechanism is sufficiently lubricated during production. Relubrication of
the circuit breaker mechanism is unnecessary and may result in material damage.
Never lubricate the breaker mechanism or the contacts of the circuit breaker.
NOTICE
Material damage due to blown particulates
Disturbed dust can affect the function of the circuit breaker.
Vacuum the dust using suitable equipment. Never blow out dust using compressed air or
similar.
The following checklists are non-binding. Not all of the items listed are relevant for the
inspection depending on the scope of supply of the circuit breaker and the installed accessory
components.
4.4.2
Visual inspection
Inspect the following components for pollution, damage and rust:
• Operator panel including external electronic trip unit
• Display and operator controls
• For size 2: Lateral front covers on both sides of the operator panel
• Circuit breaker enclosure
• Arc chute covers
• Circuit breaker feet
• Busbar connections (check for signs of overheating and deposits)
• Finger clusters in the guide frame
• When the operator panel is removed: Breaker mechanism (where accessible)
• Internal accessories: Closing coil, shunt trip, spring charging motor
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
Inspection & Maintenance
4.4 Performing inspection
171
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