The Siemens SIRIUS 3RH1131-1AH00 is an auxiliary contactor in the size S00 frame, designed for control-circuit switching in motor starter and contactor assemblies. It carries 3 normally-open and 1 normally-closed instantaneous contacts, rated 10 A at AC-12 duty — the resistive-load curve that governs most PLC and relay interface circuits.
Mounting and wiring
Mounts via screw or snap-on to a DIN rail, with the standard S00 footprint: 45 mm wide, 57.5 mm tall, 72 mm deep. The mounting position accepts ±180° rotation on a vertical surface and ±22.5° tilt forward or backward — useful when you're squeezing this into a crowded panel section and the rail isn't perfectly aligned. Terminals accept solid conductors from 0.5 mm² up to 4 mm², with the clamping ranges split as 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), and 2x 4 mm². That covers the control wiring you'll typically run — 1.5 mm² for the coil circuit, 2.5 mm² for the contact loop back to the PLC input card. Front face is IP20 rated; the enclosure itself is designed for panel interior use where no washdown or dust ingress is expected. Pollution degree 3 means it's rated for conductive pollution in industrial atmospheres — standard for a control cabinet.
Contact ratings and switching
The headline AC-12 rating of 10 A at 24 V tells you the continuous resistive-switching capability for control transformers and solenoid loads. For inductive DC switching, the numbers drop fast: 1 A at 110 V, 0.27 A at 220 V. At 230 V AC the contacts handle 6 A; at 400 V AC, 3 A; at 690 V AC, 1 A. If you're switching a DC brake coil or a contactor holding circuit, size the load against the DC voltage column — the AC-12 number won't apply. Mechanical endurance is listed at 30 million operating cycles typical for the contactor. No electrical endurance figure is given under load, so that mechanical number is the benchmark for replacement intervals in dry-circuit or lightly loaded signal switching.
Environmental and lifecycle
Operating temperature range is -25 to +60 °C; storage and transport span -55 to +80 °C. Shock resistance is tested at 10g / 5 ms and 5g / 10 ms — enough for most industrial machinery but not for direct mounting on a high-impact press. Altitude limit is 2 000 m above sea level. The lifecycle stage is marked as current production. Sourced and quoted to order against an RFQ through independent distribution — availability and current pricing confirmed at quote time.