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Application

SZM1LE series residual current circuit breaker(hereinafter referred to as circuit breaker) is suitablefor distributing network ofAC50Hz,ratedvoltage400V,ratedcurrent 800A, to make indirect contactprotection to the human being, also to prevent fireaccident caused by ground fault current due to thedamage of insulation of equipment. In addition, it notonly can be used to distribute electric energy and protect the circuit and power equipment against overload and short circuit, but also can be used to switch the circuit or start the motor infrequently. The sampling operational power supply of leakage protec-tion module of common residual current  circuitbreakers is two phases, but this series of circuitbreakers is three phases, and if any one of  threephases is lack, this circuit breaker leakage protectionmodule can still work normally. The rated residualoperation current and max breaking time may beadjusted according to practical situations.

Providedthat the phase voltage declines to 50V, the leakageprotection module can still work normally. In addition,this circuit breaker has function of leakage alarm output.