Siemens 3RH2131-2FB40 is a SIRIUS auxiliary contactor relay with a 24 V DC coil and a 3 normally open plus 1 normally closed contact arrangement, designed for control-circuit switching. It includes an integrated diode across the coil and uses spring-loaded terminals for reliable wiring in a compact S00 frame size. Weighing about 0.313 kg, it is part of the SIRIUS 3RH2 family of auxiliary contactors used to interface control circuits with main power contactors. Mechanical life is rated up to 30,000,000 switching cycles.
