Magnetothermal Circuit Breakers AC contactor switch 32A magnetic contactor LC1-D3210 AC220V/380V 50/60HZ AC contactor is suitable for using in circuits up to 660VAC, 50Hz or 60Hz, to frequently make, break, start and control the AC motor. becomes the mechanical interlock contactor of delay contactor, star-triangle starter. With the thermal relay, it is combined in the electromagnetic starter