Siemens 3RT2037-1SB30 Three-Phase AC Contactor

Siemens 3RT2037-1SB30 is a three-pole power contactor from the 3RT2 family, designed for AC-3 and AC-3e motor switching at up to 400 V and 65 A, delivering up to 30 kW at 400 V. The coil accepts a control voltage range of 21–33 V for AC or DC operation and includes an integrated varistor to suppress spike voltages, with a single normally closed auxiliary contact to support basic monitoring and interlock functions. Mounting on TH 35 rails in size S2 is supported, with screw-terminal connections and the option for snap-on mounting, enabling flexible installation in compact control panels. In typical industrial automation use, this contactor handles three-phase motors in conveyors, pumps, and fans, providing robust switching performance, straightforward PLC interfacing, and a space-efficient footprint.