FSM1 series of moulded case circuit breaker is one of our new type products developed and manufactured by adopting international advanced technology.It is supplied with rated insulating voltage 660V and used for circuit of A.C50Hz,Rated operating voltage AC 380V.(or below).rated operating current up to 800A for infrequent changing over and starting of the motors.Equipped with the protection devices for over-current,short circuit and undervoltage,the products are capable of preventing demage of circuit and suply units.