The Siemens 3RH1131-2AG10 is a SIRIUS auxiliary contactor in the S00 frame size, rated for 10 A at AC-12 duty — that's the resistive-load curve for control circuits, so it handles solenoid valves, contactor coils, and indicator lamps without derating. It carries 3 normally open instantaneous contacts and no delayed or leading/lagging switching, making it a straight-forward add-on for extending a contactor's auxiliary contact count or building a standalone interlock.
Mounts via screw or snap-on onto a DIN rail; the 45 mm width and 73 mm depth fit the standard S00 footprint, so it drops into any panel already laid out for that frame. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when you're squeezing it into a tight enclosure corner.
Ratings and environment
Rated surge voltage withstand is 6 kV, which covers most 400 V industrial control panels without additional suppression. IP20 on the front keeps fingers out but expects the panel enclosure to provide the washdown or dust seal. Operating temperature range is -25 to +60 °C; storage and transport go from -55 to +80 °C. Shock resistance is 10g for 5 ms and 5g for 10 ms — enough for most machine-mounted panels but not for high-vibration applications like a press or crusher without additional damping.
Wiring and contact reliability
Terminals accept 2x (0.25 to 2.5 mm²) solid or 2x (24 to 14 AWG) stranded — standard for control wiring. Contact reliability is specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA, which is the low-level signal reliability spec; if you're switching dry contacts or PLC inputs, this contactor won't give you nuisance failures.