The Siemens 3RH1431-1AD00 is a SIRIUS auxiliary contactor in size S00, carrying 3 normally open instantaneous contacts.
The 3 NO contact set switches 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — so it covers both 24 VDC control loops and 230 VAC pilot circuits from the same contactor. At 690 V it still breaks 1 A, which matters for line-voltage interlocking in 690 V panels. Contact reliability is rated at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — a dry-circuit spec that means it can switch PLC-level signals without the usual gold-plating concern. The mechanical life of 5 million operations typical for this contactor size means it outlasts most panel refreshes. The IP20 front protection means the terminals are finger-safe but the contactor needs enclosure protection against dust and moisture.
Dimensions are 90 mm wide, 57.5 mm high, 72 mm deep — the S00 footprint shared across the SIRIUS contactor family. Solid wire connections accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². That covers the typical control-circuit wiring range from signal loops up to short-run 4 mm² feeds for daisy-chained auxiliaries.