Siemens 3RH1911-1AA01 is a compact auxiliary contact block for Sirius 3RH/3RT contactors that provides a single normally closed (NC) contact rated for 10 A at up to 240 VAC. This S00-sized module uses screw-terminal connections and is designed to mount with compatible auxiliary blocks on Siemens 3RH10 and 3RT10 family contactors, delivering an isolated control-circuit output for signaling, interlocks, or safety-related feedback in industrial automation. The NC contact adds a dedicated auxiliary path without altering the main switching function of the contactor.
