What it is and where it fits
The Siemens 3RH2122-1BJ80 is a SIRIUS auxiliary contactor, size S00, with 2 instantaneous normally open contacts and a 24 VDC coil drawing 4 W closing and 4 W holding power. It mounts via screw and snap-on onto 35 mm DIN rail, with a 45 mm width and 73 mm depth — fits standard panel layout without special adapters. Rated operational current varies by voltage: 10 A at 24 V AC, 10 A at 230 V, 3 A at 400 V, 1 A at 690 V, and 0.5 A at 440 V, among others, covering control circuits across common line voltages.
Mounting and integration
Fastening method is screw and snap-on onto 35 mm DIN rail; mounting position allows +/-180° rotation on a vertical surface and +/-22.5° forward/backward tilt. Clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side — plan panel layout accordingly for arc and cooling.
Environmental and compliance
Operating temperature range -25 to +60 °C; storage -55 to +80 °C; relative humidity minimum 10 %; degree of pollution 3. Substance prohibitance date 10/01/2009 indicates RoHS compliance alignment.