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. 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. That matters when you're routing wire bundles in a shallow enclosure and need to orient the relay for access.
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 (–). 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. Shock resistance is 10g / 5 ms and 5g / 10 ms, adequate for machine-mounted panels on presses or conveyors.
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.