The Siemens SIRIUS 3RH1131-1BW40 is a size S00 auxiliary contactor rated for 48 VDC coil voltage, delivering 10 A at AC-12 (resistive) duty. It carries three instantaneous normally-open contacts and one normally-closed auxiliary switch, all rated for 6 kV surge voltage resistance. Mounts via screw or snap-on to DIN rail — the 45 mm width and 72 mm depth fit standard panel layouts. Operating temperature range is -25 to +60 °C, with storage down to -55 °C. Pollution degree 3 suits industrial environments.
Wiring and contact ratings
Solid wire capacity is 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² — covers most control-circuit terminations without ring lugs. The coil draws 3.2 W closing and holding, so no inrush spike to size a power supply around. AC-12 rating at 10 A is the resistive load limit; derate for inductive or motor loads per the switching curves. At 230 V AC the contact rating drops to 6 A, at 400 V AC to 3 A, and at 690 V AC to 1 A — the voltage derating is steep above 230 V.