Siemens 3RT2035-1NB30 Three-Phase Power Contactor

Siemens 3RT2035-1NB30 is a three-pole power contactor designed for AC-3 motor control, rated for 41 A and capable of switching motors up to 18.5 kW at 400 V. It uses a 20–33 V AC/DC coil and operates at 50/60 Hz, enabling reliable control from common automation systems. The device includes an integrated varistor for transient suppression and provides one normally open and one normally closed auxiliary contact (1 NO + 1 NC) with screw terminals for straightforward wiring. Classified as size S2 within the 3RT2 series, it is purpose-built for compact panel installations in industrial controls. In motor control applications, this contactor enables safe starting and stopping of three‑phase motors, making it suitable for drives, pumps, fans, and conveyors where robust AC‑3 switching is required.