What it is and where it fits
The Siemens SIRIUS 3RH1131-1BK80 is a size S00 auxiliary contactor with four normally-open instantaneous contacts and no normally-closed or delayed poles. The 52 V DC coil draws 3.2 W on pickup and hold, so the control transformer and rectifier can be sized for that continuous load. Front-side IP20 means it's protected against finger contact in a closed panel but not against washdown — keep it inside the enclosure. It mounts via screw or snap-on onto a DIN rail, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward. That matters when you're squeezing it into a crowded gland-plate area or a swing-frame subpanel.
Switching capacity by voltage — what it actually handles
The contact ratings are given at specific voltages, not a single blanket current. At 24 V rated value it switches 10 A; at 110 V rated value it drops to 1 A; at 230 V rated value it handles 6 A; at 400 V rated value it's 3 A; at 500 V rated value 2 A; at 690 V rated value 1 A. The 220 V rated value figure of 0.27 A is notably lower than the 230 V figure — that's the DC switching curve for that coil voltage band, not a typo. For a 24 VDC pilot circuit, the 10 A rating gives comfortable headroom for a bank of solenoid valves or indicator lamps.
Wiring and integration details
The screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². AWG equivalents are 2x (20 to 16), 2x (18 to 14), or 1x 12. That covers most control-circuit wiring from signal-level through motor-circuit interposing. The 72 mm depth, 45 mm width, and 57.5 mm height keep it within the S00 footprint — fits alongside contactors and relays on the same DIN rail without overhang. Contact reliability is specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA. That's the dry-circuit performance — important when switching PLC inputs or low-energy signals where oxide films on silver contacts can cause intermittent failures. Mechanical endurance is rated at 30 million operations typical, so it outlasts most machines it's installed in.
Environmental and electrical robustness
Operating temperature range is -25 to +60 °C; storage and transport range is -55 to +80 °C. Shock resistance is 10g at 5 ms and 5g at 10 ms. Pollution degree 3. Surge voltage resistance is 6 kV.