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A circuit breaker must be reset to ON after a short circuit but does not need to be replaced. It depends on the type of CB. A fuse is also a circuit breaker and it needs to be replaced after a short circuit. Relayed circuit breakers have to be "picked up" after a dropout and need not be replaced as such.

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โˆ™ 2009-05-12 03:44:15
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Q: Is it true or false that a circuit breaker must be replaced after a short circuit occurs?
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