Type FCL3 Residual Current Circuit Breaker without Over current protection is in conformity with the standards of GB16916.1、IEC1008、BS4293. It can be used in the circuits of AC 50~60Hz, single phase 230V(220V) , three phases 400V(380V) It is suitable for use in industrial & mining enterprises, Commercial buildings and housing for the protection of personnel and electric equipment from electric shock hazard and fire caused by earth leakage. And it also can be use for unfrequent switch over of circuits under normal conditions.