Type FSL1 Residual Current Circuit Breaker without Over Current Protection conforms to the standards of GB16916.1﹑IEC 1008﹑BS 4293 etc.It is used in the circuits of AC 50-60 Hz.Single phase 230V(220V),three phase 400V(380V) in industrial&Mining enterprises,Commercial Buildings and housing for protection of personal electric shock hazard and electric equipment and for unfrequent switchover of circuits under normal conditions.