What it is and where it fits
The Siemens SIRIUS 3RH1122-1AF00-ZW97 is an auxiliary contactor in size S00, designed for control-circuit switching in motor starter and contactor assemblies. It provides 2 normally open (NO) instantaneous contacts rated for 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, with a surge voltage resistance of 6 kV. The IP20 front protection allows safe panel integration, while the screw and snap-on mounting fits standard DIN rails — the same footprint as the S00 contactor family, so it shares rail space and wiring channels without rework.
Contact ratings and what they mean for your circuit
The contact ratings are given per voltage level: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are thermal current ratings for AC loads at the respective voltages — the 10 A at 24 V is the highest current the contacts can carry continuously, while the 6 A at 230 V is the typical rating for a 230 V control circuit. The 6 kV surge voltage resistance means the contactor can withstand transient overvoltages common in industrial panels without flashover, which is critical for reliability in environments with motor switching or nearby lightning paths.
Mechanical endurance and environmental limits
Mechanical life is rated at 30 million switching operations typical, with contact reliability specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA — this is a dry-circuit reliability figure that matters for PLC-level signal switching where contact oxidation can cause intermittent faults. The operating temperature range is -25 to +60 °C, with storage and transport range of -55 to +80 °C. Shock resistance is 10g at 5 ms and 5g at 10 ms, suitable for panel mounting on machinery subject to vibration. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in tight enclosures.
Wiring and termination
The screw terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², and 2x 4 mm². The 4 mm² capacity allows daisy-chaining control power through the contactor without an additional terminal block. The degree of pollution is 3, meaning the contactor is rated for conductive pollution environments typical in industrial panels without sealed enclosures.