1>Suitable for using in the circuit up to the rated voltage 660V AC 50Hz or 60Hz, rated current up to 95A. 2>Mainly used for making and breaking electric circuit as through long distance to break circuit and frequently start control AC motor. 3>Combined with the auxiliary contact block and air delay contactor mechanical interlocking as well as star-deltastarter. 4>With the thermal relay, it is combined into the electromagnetic starter.