Part identity and key ratings
The Siemens SIRIUS 3RH1122-2JF40-0LA0 is a Size S00 auxiliary contactor with a 110 V DC coil, designed for control-circuit switching in industrial panels. It carries 2 normally-open and 2 normally-closed instantaneous contacts. The coil draws 11 W closing power and holds at 4 W. Rated thermal current (Ith) is 10 A at 24 V. For DC loads at 110 V, the rated operational current is 1 A.
Mounting, wiring, and environment
Mounts via screw or snap-on onto a DIN rail; the mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Dimensions are 45 mm wide, 60 mm high, 73 mm deep — fits standard S00 panel cutouts. Terminals accept solid or stranded conductors from 0.25 to 2.5 mm², two per clamp. Front protection is IP20, suitable for enclosed control cabinets; pollution degree 3 means it tolerates conductive dust in industrial environments. Operating temperature range is -40 to +70 °C; storage and transport range is -55 to +80 °C. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms.