The Siemens SIRIUS 3RH1122-2AP00-1AA0 is a Size S00 auxiliary contactor with 2 normally-open instantaneous contacts. It mounts via screw or snap-on to a DIN rail, fitting a 45 mm wide slot in the panel — standard for compact control cabinets where every millimeter of rail space counts.
Switching capacity and contact reliability
Rated for 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V AC, this contactor handles pilot-duty and signal-level loads across common control voltages. The contact reliability spec — one incorrect switching operation per 100 million operations at 17 V, 1 mA — means it can be trusted for low-energy PLC inputs and sensor circuits where a dry contact must close every time.
Environmental and mounting constraints
Operating temperature range -25 to +60 °C, storage down to -55 °C, and shock resistance of 10g / 5 ms (and 5g / 10 ms) suit it for panels on vibrating machinery or in unconditioned enclosures. Pollution degree 3 means it tolerates conductive dust and humidity typical of industrial floors. IP20 on the front protects against finger contact but not water — keep it inside a closed cabinet.