Siemens 3RH2122-1BF40 is a SIRIUS Hilfsschütz (auxiliary contactor) in frame size S00 that provides four contacts: two normally open and two normally closed. It is a DC-coil device rated for 110 V, with screw-terminal connections and upright mounting, and it features IP20 front protection with finger-safe access. This four-pole auxiliary contactor is designed for control circuits to interlock and signal other relays and motor-start components within Siemens automation systems.
