What it is and what it does
The Siemens 3RH1122-1AN20 is a SIRIUS auxiliary contactor in size S00, designed to switch control circuits and signal loads in industrial panels. It carries 2 instantaneous normally-open contacts, rated 10 A at 24 V and 6 A at 230 V, with a mechanical endurance of 30 million cycles. The contact reliability specification — one incorrect switching per 100 million operations at 17 V, 1 mA — means it handles low-energy PLC and relay signals without nuisance failures, a common pain point in dry-contact circuits.
Panel integration and mounting
Mounts via screw or snap-on onto a DIN rail. The 45 mm width and 72 mm depth fit standard S00 contactor spacing; the 57.5 mm height leaves clearance under typical enclosure depths.
Wiring and terminal capacity
Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². That covers most control-circuit wiring from 18 AWG to 12 AWG. Pollution degree 3 means the contactor is rated for conductive pollution environments — typical in industrial enclosures without climate control.
Environmental and mechanical ratings
Operating temperature range -25 to +60 °C; storage and transport range -55 to +80 °C. Shock resistance tested at 10g / 5 ms and 5g / 10 ms — sufficient for most industrial machinery, though not rated for continuous high-vibration applications like crushers.