The contactor is suitable for using in the circuit the rated voltage up to 660V AC 50Hz or 60Hz, rated current 630A, for making & breaking, and for frequently starting and controlling the motor. After combined with the mechanical interlocking device. it becomes 3TD series Convertible contactor for controlling, starting, breaking and reversing of the motor. The products comply with IEC 60974-4 & GB14048-4.