The Siemens 3RH1122-2BB40-ZW96 is a SIRIUS auxiliary contactor in size S00, with a 24 V DC coil drawing 3.2 W for both closing and holding. It carries two instantaneous normally-open contacts rated at 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — these are the switching capacities for the auxiliary circuit, not a main power path.
Mounting and panel fit
Snap-on mounting to DIN rail or direct screw fixing — the same 45 mm wide footprint as the S00 contactor range. Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward or backward. The 73 mm depth leaves clearance behind the panel door for wiring. Terminals accept 2x (0.25 to 2.5 mm²) solid or 2x (24 to 14 AWG) stranded. IP20 on the front face means it's protected against finger contact but not moisture — keep it inside a sealed enclosure.
Contact ratings and switching reliability
The two NO contacts are instantaneous (no delayed or lagging switching). Rated surge voltage resistance is 6 kV, and the contact reliability spec is one incorrect operation per 100 million switching operations at 17 V, 1 mA — important for PLC-level signal switching where dry-circuit reliability matters. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) and operating temperature range -25 to +60 °C. Storage and transport range extends to -55 to +80 °C.