The Siemens SIRIUS 3RH1122-2AP00-ZX95 is a size S00 auxiliary contactor — 45 mm wide, 60 mm tall, 73 mm deep — built for control-circuit switching in panels where you need extra N.O. or N.C. contacts without a bigger main contactor. It carries 2 instantaneous N.O. and 2 instantaneous N.C. contacts, rated 10 A at 24 V, and the coil pulls in on 50/60 Hz at 0.8–1.1 x rated voltage. The front face is IP20, so it's fine inside a closed panel; the screw and snap-on mounting lets you clip it onto a DIN rail or bolt it down.
Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. The solid terminal accepts 0.25 to 2.5 mm² wire — strip length is standard for spring-cage or screw terminals. Shock resistance is 10g at 5 ms and 5g at 10 ms, so it holds up in moderate-vibration panels. Contact reliability is rated at one incorrect switching per 100 million operations at 17 V, 1 mA — that's the low-energy reliability number, not the power-switching life.
Compared to the 3RH2122-2AV00, the 3RH1122-2AP00-ZX95 shares the same S00 frame and 2 NO + 2 NC contact arrangement, but the 3RH2122 variant typically carries higher coil voltage ratings. The 3RH1122-2AP00-ZX95 uses a 24 V coil; if your panel is wired for 110 V or 230 V control, you'd need a different coil code. The mounting footprint and terminal layout are identical — it drops into the same DIN-rail slot without rewiring the contact block.