Siemens 3RT2025-1BB40 Sirius Three-Phase Power Contactor

The Siemens Sirius 3RT2025-1BB40 is a 3-pole power contactor designed for motor control in AC-3 and AC-3e duty, rated up to 400 V and capable of switching 7.5 kW (approximately 17 A) with a 24 V DC coil, making it suitable for medium‑power start/stop applications in compact control panels. This size S0 device includes one normally open and one normally closed auxiliary contact (1 NO + 1 NC), uses screw terminals for secure wiring, and is part of the SIRIUS 3RT family known for modular integration in motor-control architectures. The product is specified as AC‑3e/AC‑3 up to 400 V with a 24 V DC coil, and Siemens notes it as a communication‑capable member of the SIRIUS line, confirming compatibility with modern control systems and straightforward panel mounting.