What it is and what it does
The Siemens 3RH2122-1AP00-ZW97 is a SIRIUS auxiliary contactor in the S00 frame size — the smallest footprint in the SIRIUS contactor family, meant for switching control loads and signaling in a motor starter or contactor assembly. It mounts via screw and snap-on onto 35 mm DIN rail. Rated at 10 A at 24 V, with a 50/60 Hz coil tolerance of 0.8–1.1 x rated voltage at 50 Hz and 0.85–1.1 at 60 Hz. The arcing time sits between 10 and 15 ms. That 10 A at 24 V is the headline figure for control-circuit switching — enough for a bank of pilot lights, relays, or PLC inputs.
Panel fit and mounting
Dimensions: 73 mm deep, 45 mm wide, 57.5 mm tall. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Fastening method is screw and snap-on onto 35 mm DIN rail. The snap-on feature means no tools for initial placement; the screw secures it against vibration in a panel.
Environmental and compliance
Operating temperature range -25 to +60 °C; storage -55 to +80 °C. Pollution degree 3 — suitable for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation. Relative humidity minimum 10 %. Substance prohibitance date 10/01/2009 aligns with RoHS compliance.