CLJ3 series residual current action relay is AC type residual current relay, mainly used in power distribution system with AC50Hz, rated current 630A and below,rated operating voltage 690V and below the neutral point directly grounded, and withcircuit breakers or contactors and other components of the combined residual current protector.Protectors can provideadditional protection against fire hazards that may arise from persistent ground faults that cannot be detected by overcurrent protection devices.Products conform to the standard: GB/T22387-2016 "Residual current action relay".