Client has problems with normally open bypass breaker that tripped free when closed. There was no fault or overload on the system, and the same source was on both sides of the breaker when closed. Breaker is electrically-operated, drawout-mounted, and is less than 1 year old. Trip unit flags gave no clue as to trip cause. Square D has done forensic testing and has said that the trip unit has a problem.
Anyone else experienced this or something similar?
Regards, Chris Johnston