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A circuit breaker will be damaged by a higher than designed fault current that it has to make/break…this is the “Rated Breaking Current”, normally referred to as the kA of the circuit breaker.

If this energy was of the sort to melt the contacts together before the circuit breaker had time to react we have a potentially dangerous situation because the thing that was supposed to protect you has melted together already and the rest is up to the lord to protect us.

But in my opinion, this is what happens more frequently…

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