The Siemens 3RH1122-1HE40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. It mounts via screw or snap-on onto a DIN rail, occupying the S00 contactor footprint — 45 mm wide, 57.5 mm tall, 72 mm deep — so it drops into the same rail space as a size S00 contactor without re-spacing the enclosure layout.
Rated at 60 V, the relay carries a 10 A continuous current at 24 V — enough for pilot lamps, PLC digital outputs, or small solenoid valves in a 24 VDC control loop. The 2 NO instantaneous contacts handle make-and-break without delayed or lagging switching, so the relay responds immediately to the coil signal. The coil draws 2.3 W closing and holding on DC, a constant load that the PLC output or control transformer must budget for. Wire termination accepts solid conductors from 0.5 mm² up to 4 mm² (or 2x 1.5 mm², 2x 2.5 mm²), with AWG equivalents of 20–16 and 18–14 for twin wires, and 12 AWG for a single. The screw terminals are sized for standard control wiring, so no special ferrules or crimp tools are required for panel wiring.
Shock resistance is 10g for 5 ms and 5g for 10 ms, adequate for machine-mounted panels near presses or conveyors.