What this part is and where it lands in a panel
The Siemens 3RH1131-1HB40-ZW96 is a SIRIUS coupling relay — a DC-operated auxiliary contactor designed to switch control and signal circuits, not motor loads directly. It sits between a PLC output or pushbutton and the loads that need galvanic isolation or contact multiplication. Rated coil voltage is 24 V DC, holding at 2.3 W after pickup, so it stays cool in a crowded DIN-rail enclosure. The contact set gives you three instantaneous NO and one NC, each rated 10 A at 24 V — enough for most pilot-duty valve solenoids, indicator lamps, or contactor coils downstream. Size S00 (45 mm wide, 57.5 mm tall, 72 mm deep) fits the standard SIRIUS footprint — it shares the same mounting hole pattern and bus-bar slot as the 3RT1 contactors in that frame. Fastening is screw or snap-on onto a 35 mm DIN rail, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward. That matters when you're routing wire bundles in a shallow enclosure and need to orient the relay for access.
What the key ratings mean for fit
The 10 A at 24 V DC rating is the thermal current Ith for the auxiliary contacts — it's the continuous carry current, not the making/breaking capability for a DC inductive load. For DC-13 solenoid loads you'll need to derate; the 1 A at 110 V and 0.27 A at 220 V give you the actual switching curve. At AC duty the numbers are higher: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V (–). The contact reliability spec — one incorrect switching per 100 million operations at 17 V, 1 mA — tells you it handles dry-contact PLC inputs without needing a gold-flashed reed relay. Wire termination accepts solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm², plus the AWG equivalents. Pollution degree 3 means it's rated for the conductive-dust environment typical of industrial control panels — no conformal coating required for normal use. Surge voltage resistance is 6 kV, which covers impulse transients from contactor switching in the same cabinet. The IP20 protection on the front is standard for finger-safe terminal access inside a closed panel — it's not rated for washdown or outdoor exposure. Operating temperature range is -25 to +60 °C, storage and transport -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms, adequate for machine-mounted panels on presses or conveyors.
Panel integration notes
Snap it onto a 35 mm DIN rail or screw-mount it directly — the same hole pattern as the 3RT1 contactors in size S00. The 24 V DC coil draws 2.3 W steady-state, so you can drive it from a standard 24 V DC power supply without worrying about inrush exceeding the PSU's current limit. The 3 NO + 1 NC instantaneous contacts have no leading or delayed action — they all switch together, which simplifies timing in safety circuits or sequential interlocks.