What it is and what it does
The Siemens 3RH1122-2JB40-0LA0 is a SIRIUS auxiliary contactor in the Size S00 frame, designed for switching control and signaling circuits rather than motor loads directly. It carries a 24 V DC coil with a built-in diode surge suppressor, and its contact arrangement is 2 normally-open plus 2 normally-closed instantaneous contacts. Rated operational currents vary by voltage and duty: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — these are the values to use when sizing for your specific control voltage. The coil draws 11 W on pickup and holds at 4 W.
Mounting and panel fit
Mounts via screw or snap-on onto a DIN rail. The 45 mm width and 60 mm height are standard for the S00 frame; depth is 73 mm including terminals. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits in tight or awkward panel layouts. Terminals accept solid or stranded wire from 0.25 to 2.5 mm² (2 conductors per clamp). The front face carries an IP20 protection class, meaning finger-safe but not washdown-rated — keep it inside the enclosure.
Lifecycle and sourcing reality
For a BOM line that needs this exact 24 VDC S00 auxiliary contactor, the part is specified and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent supply network.
Environmental and compliance
Rated for operation from -40 to +70 °C, with storage and transport range of -55 to +80 °C. Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive due to condensation). Shock resistance is 10g / 5 ms and 5g / 10 ms. Contact reliability is rated at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — useful for low-signal applications. RoHS compliance date is July 1, 2006. Surge voltage resistance is rated at 6 kV.