S-T Standard Series Magnetic Motor Starter and Magnetic Contactor is suitable for using in the circuits up to the rated voltage 660V AC 50Hz or 60Hz, rated current up to 100A, for making, breaking, frequently starting & controlling the AC motor. Combined with the auxiliary contact block, delay timer & machine-interlocking device etc, it becomes the delay contactor, mechanical interlocking contactor, star-delta starter. With the thermal overload relay, it is combined into the electromagnetic starter. The Contactor is produced according to IEC60947-4.