Inspection & Maintenance
4.3 Planning of inspection and maintenance
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
169
• Testing of settings of electronic trip unit for plausibility in accordance with the system
conditions specified during system planning.
• Inspection of the electronic trip unit by reading out the status and maintenance
information.
• Inspection of the arc chutes and arc chute cover for damage or impermissible contact
erosion.
• Inspection of the main contacts by means of a visual check of the contact system or the
permanently integrated contact erosion indicator.
• Inspection of the IP55 protective cover for correct mounting, correct position and the
correct position of the seals.
Checklists and further information regarding the inspection
For recommended checklists and further information, see Chapter Performing inspection
(Page 171).
Maintenance
For 3WJ circuit breakers, only the arc chutes, the arc chute covers and the contact system
require maintenance.
Replacing arc chutes and the contact system
The arc chutes and the contact system may need to be replaced depending on their condition
and at the latest when the number of electrical and mechanical operating cycles without
maintenance has been reached.
The contact system may only be replaced if the maximum permissible number of operating
cycles with maintenance has not been exceeded.
Replacing the arc chute cover
Optionally fitted arc chute covers must be replaced in the following cases:
• At the latest after three circuit breaker short-circuit trips
• Whenever the arc chutes are replaced
For information about the arc chute cover and installation instructions, see Chapter Arc chute
cover (Page 144).
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