Refused fault breaker closing process, must be able to distinguish between fault coverage, the process steps:

1. bonding a first determines whether or not the circuit breaker due to the fault line Yufu trip meter indication may be caused by the presence or absence of short-circuit current closing operation from impact sudden swinging and have unlicensed lamp dimming, a sudden drop in the voltmeter indication is determined. As ascertain a fault line, fault isolation area after the vote breaker.

2. ascertain whether improper operation, closing safety means should check, whether the control switch and a reset switch place too quickly or if the position is correct and the like.

3. Check whether the operation switch on the power supply voltage is too high or too low, check whether the operation of closing safety fuse or bad, check the control switch and auxiliary contact is bad, the loop is disconnected or wiring error.

4. Check whether a stuck actuator, auxiliary contact mechanism and adjustment is inappropriate. Generally the operating mechanism is connected to a gap caused by unqualified member, need to check and replacement of the good part of high hardness.