Siemens 3RT1025-1B Sirius 3-Phase AC Contactor

Siemens Sirius 3RT1025-1B is a three-pole power contactor in the S0 size, built for motor control in three‑phase systems. Part of the SIRIUS 3RT family, it provides AC‑3 duty for starting and stopping medium‑sized three‑phase motors, with a main circuit rated for 17 A and a typical power capability around 7.5 kW at 400 V. The unit uses screw terminals for secure field wiring and is designed as a DC‑coil contactor, aligning with Sirius models that employ a DC coil configuration in control panels. With three main contacts and no auxiliary contacts in this configuration, it is suitable for applications such as pumps, conveyors, machine tools, and other machinery requiring reliable motor control in industrial panels. Related 3RT1025 variants, such as 3RT1025-1BB40 and 3RT1025-1BM40, illustrate alternative DC coil versions (24 V DC) within the same family, while maintaining identical main‑circuit ratings and three‑pole, S0 packaging.