ABB RXMS1-RK216463-AT Auxiliary Relay

The ABB RXMS1-RK216463-AT is a 250V coil auxiliary signaling relay designed to be used with ABB RX-series contactors to provide additional control and signaling paths. Part of the RXMS1 family, this unit features six make contacts (six normally open contacts) that energize in response to the coil, enabling interlock, status indication, and remote signaling without loading the main power path. The RK216463-AT variant specifies a 250V coil and is commonly paired with RXMS1 assemblies in control panels and protection schemes to translate a primary relay energization into multiple signaling outputs used by motor controllers and automation circuits. ABB's older RXMS1 documentation describes these auxiliary relays as six-contact devices suitable for signaling and tripping applications, while distributor listings confirm the 250V coil rating for RXMS1-RK216463-AT and note its status as a discontinued model. In practice, users install RXMS1 auxiliary relays to implement discreet, fail-safe signaling within ABB's guard and interlock logic, ensuring clear feedback for control systems and enabling reliable remote signaling in industrial environments.