Description
2.2 Electronic components
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
39
2.2 Electronic components
2.2.1 Electronic Trip Unit (ETU) - functional overview
We have checked the content of this manual to ensure that it is consistent with the
hardware and software described. Discrepancies cannot be wholly excluded, however,
which means that we cannot assume responsibility for the correctness of the information
provided here.
The information in this manual is reviewed on a regular basis and any necessary corrections
are included in subsequent editions.
Overcurrent protection settings
Adjust parameters only when the Circuit Breaker is switched off.
If the parameters are modified with the Circuit Breaker switched on, this can trip the Circuit
When planning a project and considering selectivity it has to be ensured loads carried by the
Circuit Breaker will not exceed the breaking capacity stated in the 3WJ catalogue.
Upstream protection equipment has to be set in a way, that these faults are interrupted
All parameters are adjusted with rotary coding switches.
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