Auxiliary contactor for SIRIUS S00 contactor systems
The Siemens 3RH1131-2BW40 is a SIRIUS-brand auxiliary contactor in the S00 frame size, designed to mount alongside or independently from the main contactor in a control panel. It provides 3 normally open (NO) instantaneous contacts and 0 normally closed (NC) contacts, switching loads up to 10 A at 24 V DC or 10 A in AC-12 duty. The 24 V DC coil draws 3.2 W during both pick-up and hold, so the power supply sizing is straightforward — no inrush spike to budget for.
Panel integration and mounting flexibility
Mounts via screw or snap-on onto a DIN rail — the snap-on feature speeds panel assembly when you're populating a row of S00 devices. The mounting position is forgiving: ±180° rotation on a vertical surface, plus ±22.5° forward/backward tilt, which helps when routing wires in a crowded enclosure. At 45 mm wide and 60 mm tall, it occupies a standard S00 footprint; depth is 73 mm, so plan for that behind the DIN rail. The front face carries an IP20 rating, adequate for a closed panel environment.
Contact ratings and switching capability
Rated operational current varies by voltage and duty: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. The AC-12 maximum is 10 A, covering resistive and small inductive loads typical in control circuits. Surge voltage resistance is rated at 6 kV, which gives reasonable margin for industrial environments without requiring additional suppression on every contact pair. Mechanical endurance is listed at 30,000,000 cycles typical — a solid figure for high-cycle applications like conveyor interlocks or packaging machines.