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  1. gianella

    3 sec vs 1 sec CB Fault Duration

    Hi, Normally MV & HV circuit breakers have 3 and 1 sec fault duration rating. If a CB has a 31.5kA rating for 3sec, is it correct to consider that it can withstand 31.5kA x 1.732 for 1 sec as derived from the formula used for cables (I2t = constant)? Will this formula apply to circuit breakers...

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