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David Clarke asked Time For A Fuse To Blow And Breaker To Trip?
How long does it take for these to happen under fault conditions?
And got the following answer:
A fuse can blow as soon as it reaches its rated current, which could be anywhere during the first cycle of the fault current wave. This can cause a severe overvoltage spike. Then, there are slow and fast blow fuses. The first ones, will withstand an inrush current, up to ten times its value, while a fast blow will not. A circuit breaker is slower because it first has to detect the overcurrent, trip, and then wait for the current cycle to reach and cross the zero for the arc to quench. This may take a few cycles, at least three, depending on the mechanism and the relay. .