What it is and what it does
The Siemens SIRIUS 3RH1122-1AS00 is an auxiliary contactor in the S00 frame size, designed for switching control and signal circuits in industrial panels. It carries 2 normally-open and 2 normally-closed instantaneous contacts, screw-type terminals, and mounts on a DIN rail or with screws. The AC-12 operational current is rated at 10 A, and the rated insulation voltage is 500 V at 50/60 Hz.
Key ratings and what they mean for your panel
The 10 A rating at 24 V (AC-12) covers most control transformer and signal loads inside a cabinet. At 110 V the contact rating drops to 1 A, and at 220 V to 0.27 A — so for higher-voltage control circuits you need to check the load current against the curve. The 500 V rated insulation voltage means the contacts can switch circuits up to that level, typical for motor control centers. The 6 kV surge voltage resistance (rated impulse withstand) ensures the contactor holds up against switching transients on the line.
Mounting and environment
The 45 mm width, 57.5 mm height, and 72 mm depth fit the standard S00 footprint — it shares the same panel cutout and DIN-rail space as other S00 contactors and relays. It mounts with screws or snaps onto a 35 mm DIN rail. The operating temperature range is -25 to +60 °C, storage and transport from -55 to +80 °C. The front face carries an IP20 rating, so it's protected against finger contact but not washdown — keep it inside a sealed enclosure.