The Siemens SIRIUS 3RH1140-1BC40 is a size S00 auxiliary contactor with four normally-open instantaneous contacts — no delayed, lagging, or make-before-break switching here, just clean NO closure. Rated 10 A at 24 V and derated across the voltage range down to 1 A at 690 V, it handles signal-level and moderate power switching in control circuits. Coil holds at 3.2 W DC; the magnet circuit is rated for 30 V rated value with a 0.8 initial pickup threshold and 1.1 full-scale dropout. Mounts via screw and snap-on to DIN rail — the 45 mm width fits standard panel slots, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward/backward, so you can orient it to match existing wiring runs. IP20 on the front means it's protected against solid objects larger than 12 mm; fine for enclosed panels but not for washdown environments.
Contact configuration and ratings
Switching current by voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V, and 0.27 A at 220 V. The 110 V rating is 1 A. These are the rated operational currents — use them for contactor coil switching, indicator lamps, or small solenoid valves within the S00 frame's thermal limits.
Environmental and mechanical
Operating temperature range -25 to +60 °C; storage and transport from -55 to +80 °C. Shock resistance rated at 10g for 5 ms and 5g for 10 ms — sufficient for most industrial panel applications but not for high-vibration environments like direct engine mounting. Pollution degree 3, meaning it tolerates conductive pollution in controlled environments. Terminal capacity accepts 2x 0.5 to 1.5 mm² solid, 2x 0.75 to 2.5 mm², or 2x 4 mm². Surge voltage resistance rated at 6 kV.