The Siemens 3RH1122-2BB40-ZX95 is a SIRIUS auxiliary contactor in size S00, designed for switching control circuits and signaling loads in industrial panels. Its 24 VDC coil draws 3.2 W during both closing and holding, so the power supply sizing is straightforward — no inrush peak to budget for. The contact block carries 2 NO instantaneous contacts and 2 NC contacts, rated 10 A at AC-12 (resistive) and 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. That means it handles typical 24 VDC pilot-duty loads easily, and the 690 V rating covers most 3-phase control circuits without derating concerns.
Mounting and integration
Mounts via screw or snap-on onto DIN rail. The 45 mm width and 73 mm depth fit standard S00 contactor spacing — zero side clearance required, so you can pack them tight in a row. Mounting position allows +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward, which helps when the panel layout forces an odd angle. IP20 on the front means it's protected against finger contact but not washdown; keep it inside a closed enclosure.
Wiring and compliance
Solid and stranded wire from 0.25 to 2.5 mm² fits the screw terminals. Surge voltage resistance rated at 6 kV, which aligns with IEC 60947-1 overvoltage category III for industrial control circuits. The part carries the SIRIUS brand and is designed for use with Siemens S00 contactor systems. Compliance documentation (RoHS, REACH, UL, IEC) is standard for this series — the manufacturer provides declarations on request.