Siemens 3RT2025-1BB44 SIRIUS Contactor

Siemens 3RT2025-1BB44 is a SIRIUS three-pole power contactor designed for AC-3e/AC-3 motor control at 400 V. It features a 24 V DC coil and a 17 A (7.5 kW at 400 V) load rating, making it suitable for mid-size motors in panel assemblies. The unit provides two normally open (NO) and two normally closed (NC) auxiliary contacts, wired via screw terminals, and it comes in size S0 with a removable auxiliary switch for flexible control options. As part of the SIRIUS 3RT2 family, this three-pole contactor supports reliable starting and stopping of motors such as conveyors, pumps, fans, and compressors powered from 400 V AC. The combination of a 3-pole configuration, screw-terminal wiring, and integrated auxiliaries enables straightforward integration into standard motor starter assemblies while maintaining a compact footprint in control panels.