The Siemens SIRIUS 3RH1344-1BB40 is an auxiliary contactor in the S00 frame size, designed for control-circuit switching in motor starter and contactor assemblies. It carries four normally-open instantaneous contacts and a 24 V DC coil rated at 3.2 W closing and holding power. Rated for 10 A at AC-12 (resistive load), it also handles 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V — covering typical control voltages across global panel builds. The coil holds at 24 VDC nominal; the operating range factor of 0.8 to 1.1 times rated voltage means it picks up reliably down to about 19.2 V and drops out below that threshold. Mounting is screw or snap-on onto DIN rail, with a 45 mm width and 111 mm depth that fits standard S00 contactor footprints. The IP20 front-of-panel protection suits enclosed control cabinets.
Integration and Wiring
Terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm² — covering common panel wire sizes. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in tight enclosures. Operating temperature range -25 to +60 °C; storage and transport from -55 to +80 °C. Shock resistance rated at 10g / 5 ms and 5g / 10 ms. Altitude limit 2,000 m without derating.