What it is and what it does
The Siemens SIRIUS 3RH1131-1AF10-ZX95 is a size S00 auxiliary contactor — a switching relay that mirrors the state of a main contactor or provides isolated signal feedback in a control circuit. It carries 3 normally-open and 1 normally-closed instantaneous contacts, rated 10 A in AC-12 duty (resistive loads at 24 V), with a rated surge voltage resistance of 6 kV. The AC-12 rating governs its use for switching resistive loads in control circuits — think PLC outputs, relay coils, or indicator lamps — not motor starting. The 10 A figure at 24 V is the continuous thermal current; derate for higher voltages per the switching capacity curve (1 A at 110 V, 0.27 A at 220 V).
Panel fit and mounting
The S00 frame measures 45 mm wide by 57.5 mm deep by 72 mm tall — a compact footprint that fits standard DIN-rail enclosures. Fastening is via screw or snap-on mounting; the snap-on option allows tool-less rail attachment, useful during panel assembly. Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. Wire termination accepts solid conductors: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² per terminal. For AWG: 2x (20...16), 2x (18...14), or 1x 12. The IP20 protection on the front means it's safe from finger contact but not washdown — standard for enclosed control panels.
Environmental and reliability specs
Operating temperature range is -25 to +60 °C; storage and transport range is -55 to +80 °C. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms. Pollution degree 3 means it tolerates conductive pollution in industrial atmospheres — typical for factory-floor panels without climate control. Contact reliability is specified at one incorrect switching operation per 100 million operations at 17 V, 1 mA — a figure that matters for low-level signal switching where oxide films on dry contacts can cause intermittent faults. The mechanical endurance is 30 million operations typical.