The Siemens SIRIUS 3RH1131-2VB40 is a coupling relay for switching auxiliary circuits — think of it as the signal-level interface between a PLC output or pushbutton and the coil of a larger contactor. It carries three normally-open instantaneous contacts, each rated 10 A at AC-12 and 10 A at 24 V. The coil is 24 VDC, pick-up at 85% of rated voltage, drop-out at 185%, with a constant 1.4 W power draw during both closing and holding. A built-in diode surge suppressor handles the back-EMF from the coil — no external snubber needed.
Mounts by screw or snap-on onto a DIN rail. Side clearance is zero; you can gang units side-by-side without extra spacing.
Shock resistance tested at 10g / 5 ms and 5g / 10 ms. Maximum operating altitude 2000 m.
Contact ratings across voltages
The three NO contacts are rated for switching at multiple voltage levels: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. Also rated 1 A at 110 V and 0.27 A at 220 V. The 30,000,000 mechanical operating cycles reflect a long service life for auxiliary-duty cycling.