Integrator note — 3RH1131-2GG20
The Siemens 3RH1131-2GG20 is a SIRIUS auxiliary contactor in size S00, designed for switching control and signal circuits in motor starter and contactor assemblies. It carries 3 normally-open and 1 normally-closed instantaneous contacts, rated 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for most PLC output and relay interposing duties. The front face is IP20, so it's safe for open-panel use with no additional cover. Mounting is via screw or snap-on onto a DIN rail; the S00 footprint (45 mm wide, 60 mm tall, 73 mm deep) fits standard enclosure layouts without crowding adjacent devices.
Contact ratings and wiring
Each contact accepts solid or stranded conductors from 0.25 to 2.5 mm² — typical for control wiring. The 10 A rating at 24 V is the highest thermal current; at 110 V the rating drops to 1 A, and at 690 V it's 1 A. For AC-15 switching (solenoid valves, contactor coils), the 50 Hz make/break ratio is 0.8–1.1 at rated voltage. The contact reliability spec — one incorrect switching per 100 million operations at 17 V, 1 mA — makes it suitable for low-energy signal paths where oxide buildup on standard contacts would cause intermittent faults.
Mounting and environment
Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. Shock resistance is 10g for 5 ms and 5g for 10 ms. Operating temperature range is -25 to +60 °C; storage and transport tolerate -55 to +80 °C. Pollution degree 3 means it's rated for industrial environments with conductive dust or moisture — no additional conformal coating needed for most panel conditions.