Question about NRS Siemens Fxd63s250a Circuit Breaker 250a 600v 3p
How long does the breaker hold after resetting? You probably have an 'intermittent ground fault' . If the breaker just trips randomly. One way to locate it would be a megger test on all three phases going out to the loads. Any phase that shows a possible ground could help narrow it down. Sometimes, if possible, you can turn certain breakers off and see if your problem goes away.A meter in record mode could be the best solution. Fluke meters have this option and you could monitor the phase voltage and during a 'ground fault' the voltage will drop some and you'll lock in the dip on the meter.
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
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