SIRIUS 3RH1140-1AS00: what the ratings mean for your panel
The Siemens 3RH1140-1AS00 is a SIRIUS auxiliary contactor in size S00, designed for switching control and signal circuits in motor starter and PLC output isolation applications. Its 4 normally-open (NO) instantaneous contacts handle rated currents from 10 A at 24 V down to 1 A at 690 V, so it matches the coil and signal loads typical in 24 VDC control panels while also supporting higher-voltage auxiliary circuits up to 500 V AC. The IP20 front protection means it's safe for finger contact in enclosed panels — no extra shrouding needed. Screw and snap-on mounting lets you clip it directly onto a DIN rail without tools, saving assembly time.
Mounting and integration
Mounts on a DIN rail via screw and snap-on fastening. The size S00 footprint (45 mm wide, 57.5 mm high, 72 mm deep) fits standard control panel layouts. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so you can orient it for tight cable routing. Solid wire capacity: accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² — covers most control wiring without lugs.
Environmental and endurance
Rated for operation from -25 to +60 °C, with storage and transport range of -55 to +80 °C. Shock resistance: 10g for 5 ms and 5g for 10 ms, suitable for industrial machinery and conveyor systems. Mechanical life typical of SIRIUS contactors: 30 million operations, with contact reliability of one incorrect switching per 100 million at 17 V, 1 mA — important for low-energy signal circuits where oxide films can cause intermittent faults. Pollution degree 3 means it tolerates conductive dust and humidity typical of factory floors.