The Siemens 3RH1122-1AF00-1AA0 is a SIRIUS auxiliary contactor in Size S00, used to switch control signals and low-power loads in motor starter and relay logic circuits. It carries 2 normally open and 2 normally closed instantaneous contacts, rated 10 A at 24 V and 6 A at 230 V. The 45 mm wide body mounts via screw or snap-on to DIN rail, and the IP20 front protection suits enclosed panel environments.
Ratings and what they mean for fit
The 10 A rating at 24 V covers the majority of PLC output and relay coil loads in control panels — that's the figure that decides whether this contactor can handle your signal circuit without an intermediate relay. At 230 V it's rated 6 A, so it switches contactor coils and small valve solenoids directly. The 690 V rating drops to 1 A, which still covers most auxiliary contact applications in 400 V motor starters. Mechanical life is 30 million operations typical, and contact reliability is spec'd at one incorrect switching per 100 million operations at 17 V, 1 mA — that's the low-energy performance that matters for PLC inputs and dry-contact circuits where oxide films can cause intermittents.
Panel integration and wiring
The 45 mm width and 72 mm depth fit the standard Size S00 footprint used across the SIRIUS contactor family. Screw terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². Mounting position is standing on a horizontal surface, fastened by screw or snap-on. Operating temperature range is -25 to +60 °C, storage -55 to +80 °C. Surge voltage resistance is 6 kV, pollution degree 3 — suitable for industrial control panels without special derating.