HR5 Serise Fuse Type Isolating Switch (hereinafter referred to as Switch)is applicable for the circuit of AC 50Hz(or 60Hz),rated voltage up to 660V,and conventional free air heating current up to 630A.It can be mainly used in the distribution circuit of high short-circuit current and the motor circuit,serving for power switch,isolating switch and emergency switch as well as circuit directly used for switching of singli motor and shall be used indoors.