Siemens 3RT1033-1BB40 is a three-pole power contactor with a 24 V DC control coil, designed in the Size 2 frame for reliable switching of three-phase loads in industrial control panels. It is rated for AC-3 duty at 25 A and up to 11 kW at 400 V, with screw-terminal wiring for secure connections. The unit comprises three main contacts and a DC-operated coil that energizes heavy-load three-phase motors from a low-voltage control circuit, and Siemens lists the recommended successor as 3RT2026-1BB40 within the Sirius 3RT2 family. This model is a phased-out product with end-of-life documented on September 30, 2022.
