The Siemens 3RH1131-1HA80 is a SIRIUS coupling relay, size S00, designed for switching auxiliary circuits in control panels. The 45 mm width and 72 mm depth match the standard S00 contactor footprint, so it snaps onto the same DIN rail alongside a 3RT2 contactor without stealing extra panel real estate.
Fastens with both screw and snap-on mounting — no tools needed for the DIN rail clip, but the screw holes give you an option for vibration-heavy spots like a conveyor drive panel. Shock rated at 10g for 5 ms and 5g for 10 ms, which covers most industrial machine vibration profiles.
Ratings that matter for the buyer
The headline number is 10 A at 24 V — that's the current it can switch continuously through the 3 NO contacts at the coil voltage. But the real-world utility is in the voltage derating: at 110 V it's 1 A, at 230 V it's 6 A, at 400 V it's 3 A, and at 690 V it's 1 A. The 6 kV surge voltage resistance (rated impulse withstand) means it can live on the same panel as drives and contactors without arc-over on transient spikes. Contact reliability is spec'd at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that's the low-energy dry-circuit performance for direct PLC output driving. The 3 instantaneous contacts (make-before-break and delayed switching are both zero on this variant) give you a straight NO set with no timing tricks.