Product identity and key ratings
The Siemens SIRIUS 3RH1131-2BM40 is an auxiliary contactor in size S00, designed for switching control and signal circuits in industrial panels. It carries 3 normally open and 1 normally closed instantaneous contacts, with a rated operational current of 10 A in AC-12 duty (resistive loads) and a 220 V DC coil. The 10 A AC-12 rating means it can handle resistive control loads up to that current, typical for pilot devices, PLC outputs, and contactor coils. The DC coil draws a constant 3.2 W for both closing and holding, so no extra power budget is needed for inrush. Mechanical endurance is rated at 30 million operating cycles, supporting high-duty applications like conveyor interlocks or machine-tool control circuits.
Mounting and integration
Mounts via screw and snap-on onto a 35 mm DIN rail. The 45 mm width matches the S00 contactor footprint, and the 73 mm depth fits standard 80 mm deep enclosures. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in tight panels. Terminals are Cage Clamp (spring-cage) for the auxiliary and control circuit, accepting 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrule. This speeds wiring and reduces torque-check steps during panel build. IP20 on the front means protection against finger contact; the contactor is intended for installation inside a rated enclosure, not exposed to washdown or dust.
Environmental and compliance
Operating temperature range is -25 to +60 °C, storage and transport -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms, suitable for machine-mounted applications with moderate vibration. Degree of pollution 3 per IEC 60947-1, meaning it tolerates conductive pollution in industrial atmospheres. Surge voltage resistance rated at 6 kV.