Siemens 3RT2037-1KB40 AC Three Phase Contactor

Siemens 3RT2037-1KB40 is a three‑pole Sirius power cont actor rated for AC‑3e duty, delivering up to 65 A and 30 kW at 400 V with three normally open main contacts, making it suitable for motor starting and other demanding control applications. The coil is 24 V DC, with a nominal operating range of 0.8–1.2 Us, and it includes an integrated varistor for surge suppression to help protect the coil and control circuitry. A built‑in auxiliary contact arrangement provides 1 normally open and 1 normally closed contact, supporting simple control logic without additional devices, while screw terminals and a compact frame size (S2) simplify wiring and panel mounting. Designed for PLC outputs and compact control panels, this unit is intended for vertical mounting and robust industrial environments where reliable switching of medium‑to‑high power loads is required.