SIRIUS auxiliary contactor, size S00 — what it switches and where it fits
The Siemens 3RH2131-2EP00 is a SIRIUS auxiliary contactor in the S00 frame size, carrying 3 normally-open instantaneous contacts. It is designed for switching control and auxiliary circuits in motor starter assemblies, panel interlocking, and signal routing — not for direct motor load switching.
Panel fit and mounting flexibility
Dimensions are 45 mm wide, 70 mm high, and 121 mm deep — the S00 footprint fits compact control cabinets where panel space is tight.
Environmental and compliance baseline
RoHS compliance date is 10 January 2009, indicating the part meets EU substance restrictions. Relative humidity minimum is 10 %.
