Siemens AG 3RT2036-1KB44-3MA0 Power Contactor

Siemens 3RT2036-1KB44-3MA0 is a three-pole power contactor from the SIRIUS 3RT family, designed for AC-3e/AC-3 duty to switch motors and other heavy loads at 400 V. It is rated for 51 A and 22 kW at 400 V, with a 24 V DC coil and a coil voltage tolerance of 0.8–1.2 × Us, ensuring consistent actuation across the typical control range. The unit includes an integrated varistor for surge protection and provides two normally open plus two normally closed auxiliary contacts, all terminating at screw terminals. Framed in size S2 and featuring a captive auxiliary switch, it is suitable for PLC outputs and easy integration with other SIRIUS accessories. Common applications include motor control on conveyors, pumps, fans, and other automation tasks where a 24 V–driven contactor must switch a 400 V motor circuit while offering feedback contacts for interlocking and control logic. This Siemens power contactor is built to pair with compatible 3RT components and PLC-based control schemes, delivering dependable switching with built-in protection and straightforward integration into standard industrial automation setups.