Accessories
3.7 Accessories for the Electronic Trip Unit
3WJ Air Circuit breakers
94 Operating Instructions, 12/2022, L1V30828903001-01
3.7.3 Retrofitting the internal N transformer
Article No.
Internal current transformer for neutral conductor, Size I
Internal current transformer for neutral conductor, Size II
Preparatory work
1. Open the Circuit Breaker and discharge the stored-energy spring.
2. Rack the Circuit Breaker into maintenance position (disconnected postion) and remove it
from the guide frame (only withdrawable Circuit Breakers).
3. Remove the operator panel and the secondary disconnect terminals.
See also chapter Preparation for maintenance work (Page 178)
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