Inspection & Maintenance
4.7 Maintaining the main contact system
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
183
Preparatory steps
Perform all steps outlined in the chapter Preparation for maintenance work (Page 178).
Withdrawable Circuit breaker 4000 A
If you have a 4000 A withdrawable Circuit breaker you have to remove the spacers on the
rear contacts before maintaining the main contact system.
Vertical main connections - optional accessory
If you have vertical main connections mounted, you have to remove them before maintaining
the main contact system.
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