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What does the dielectric test consist of that a UL489 circuit breaker must pass?

Dielectric
After testing, the circuit breaker must withstand for one minute a voltage of 1000 V
plus twice the rated voltage between:
Line and load terminals with circuit breaker in open, tripped and off positions;
Terminals of opposite polarity with circuit breaker closed;
Live parts and the overall enclosure with circuit breaker open and closed.


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