Description
2.2 Electronic components
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
55
2.2.8 Recommissioning after opening operation by electronic trip unit
1. Find the reason for the tripping of circuit breaker by pushing the button "QUERY" on the
ETU.
2. Identify the cause and resolve the issue.
– Check downstream load.
– Check ETU settings.
3. After a short-circuit trip, check the Circuit Breaker for any damage.
Inspect the contact system for possible damage, see chapter Inspection & Maintenance
(Page 165).
4. Open the transparent cover of the ETU and reset the reclosing lockout by pressing the
"RESET" trip signal button.
5. Recommission as described below:
• Inserting the Circuit Breaker into the guide frame (Page 23)
• Closing and opening (Page 24)
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