The SIEMENS 3RH2911-1HA12 is an auxiliary front-mounted switch designed to fit on the screw terminal of 3RT2 contactors and 3RH2 contactor relays. It provides additional switching contacts for signaling, interlocking, or control-circuit extensions without altering the main device. Installed on the front screw terminal, it keeps wiring accessible and simplifies panel layout by consolidating control functions at the contactor. Use it to add auxiliary feedback for status monitoring, to implement safety interlocks, or to expand control logic in motor starters and relay assemblies, ensuring clean, organized connections and straightforward maintenance.
