What it is and where it fits
The Siemens 3RH1122-1AK60-ZW97 is a SIRIUS auxiliary contactor in frame size S00 — the smallest in the family, meant for control-circuit switching, not motor loads. It gives you four normally-open and two normally-closed instantaneous contacts, all rated for the same 6 kV surge voltage withstand. Mounting is screw-fixed or snap-on onto a DIN rail, and the position is flexible: it rotates ±180° on a vertical surface and tilts ±22.5° forward or backward. That matters when you're shoehorning it into a crowded panel and the wireway forces an odd orientation. The IP20 front means it's protected against finger contact but not washdown — keep it inside the enclosure, not on the machine frame.
Contact ratings — what they actually mean for your circuit
The 10 A at 24 V rating is the headline number, but the real story is the derating curve as voltage climbs: 6 A at 230 V, 3 A at 400 V, and only 1 A at 690 V. If you're switching a 400 V control transformer or a valve solenoid on a 230 V line, use the corresponding column — not the 24 V figure. For DC switching the numbers drop faster: 1 A at 110 V, 0.27 A at 220 V. That's typical for a contactor this size — arc extinction in DC is harder. If your circuit is 125 VDC, the 110 V rating is the closest guide; don't extrapolate linearly. Contact reliability is spec'd at one failure per 100 million operations at 17 V, 1 mA — that's the low-energy end where oxide films don't self-clear. For dry-contact PLC inputs or low-voltage signal paths, this contactor is trustworthy.
Mechanical endurance and environmental limits
Mechanical life is 30 million operations typical — that's the contactor itself, not the contacts under load. Electrical life depends on the switched current and voltage; for a 24 VDC relay coil or a 230 VAC contactor coil, expect millions of operations before contact wear becomes an issue. Operating temperature spans -25 to +60 °C; storage and transport go from -55 to +80 °C. Shock resistance is 10 g for 5 ms and 5 g for 10 ms — fine for most industrial panels, but if the panel is on a vibrating conveyor or a press, check the mounting and add support. Pollution degree 3 means it's rated for conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical for control panels in non-climate-controlled factory environments.
Wiring and termination
Each terminal accepts solid or stranded copper: two conductors of 0.5 to 1.5 mm², two of 0.75 to 2.5 mm², or two of 4 mm². That covers most control wiring from signal-level pairs up to a 4 mm² feed. Dimensions are 45 mm wide, 57.5 mm tall, 72 mm deep — S00 frame. It occupies the same footprint as the base contactor in the SIRIUS 3RT2 line, so it clips into the same DIN-rail slot and shares the same wiring duct clearance.
Lifecycle and compliance
RoHS compliance date is July 1, 2006, which covers the EU RoHS directive. Substance prohibitance is declared per that date; no REACH or UL listing is explicitly stated in the spec table, but the SIRIUS series typically carries UL and CSA certification — verify the specific approval mark on the nameplate if your project requires it.