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What does the withstand rating of an NW automatic or non-automatic switch refer to?

What is the meaning of "withstand rating" on a Masterpact NW automatic or non automatic switch?
Product Line:
Molded Case Circuit Breakers
Masterpact Breakers
The withstand rating is the fault current (at rated voltage) that the switch will
withstand without damage when protected by a circuit breaker with an equal
continuous current rating.
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