The Siemens 3RH1131-2JC40 is a SIRIUS coupling relay rated for switching auxiliary circuits — think interposing relays in control panels, signal isolation between PLC outputs and motor contactor coils, or pilot-duty loads. Mounting is screw or snap-on (the evidence says both), and the enclosure is IP20 on the front — fine for a clean panel, not for washdown.
The headline rating is 10 A at AC-12 duty, which covers resistive and solid-state loads at 24 V. For higher voltages the rating drops: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. The coil power is 2.3 W DC for both closing and holding, so the coil draw is modest and consistent. The surge suppressor is built in with a diode, which means you don't need an external flyback diode for DC coil suppression — saves a component and a wiring step.
Shock resistance is 10g for 5 ms and 5g for 10 ms — adequate for most industrial panels, not for extreme mobile or high-vibration applications. That takes the guesswork out of panel layout — you can orient it to fit wire routing.
Connections and wiring
The solid connection accepts 2 x (0.25... 2.5 mm²) — that is two conductors per terminal, solid or stranded, in the range from 0.25 to 2.5 mm². No special ferrules required for stranded if you strip cleanly. The contact configuration is 3 NO instantaneous contacts (no delay, no make-before-break, no lagging). No auxiliary switch. Depth is 73 mm, height 60 mm — standard S00 dimensions that match the contactor line.