The Siemens 3RH1131-2AP00-ZW98 is a SIRIUS auxiliary contactor in size S00, designed for control-circuit switching in panels where you need three normally open (NO) contacts with no NC or delayed switching — the '3 NO + 0 NC' configuration is fixed. It's a workhorse for extending contactor or relay logic in a DIN-rail enclosure, mounting via screw or snap-on.
The contact reliability spec is one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that's dry-circuit confidence for PLC-level signals, not just power switching. Rated operational current at 24 V is 10 A; at 230 V it's 6 A; at 400 V it's 3 A; and at 690 V it's 1 A. So if you're switching a 24 VDC pilot light, you've got headroom; if you're feeding a 690 V control transformer, you're limited to 1 A — plan your contact loading accordingly.
Mechanical fit and environmental limits
Dimensions: 73 mm deep, 45 mm wide, 60 mm tall. That's a compact S00 footprint — it'll drop into the same slot as other S00 contactors. Shock resistance is 10g at 5 ms and 5g at 10 ms.