Allen-Bradley 440R-F23028 Guardmaster Safety Relay Unit

Allen-Bradley Guardmaster MINOTAUR MSR9T Safety Relay 440R-F23028 is a dedicated safety-relay device used in Guardmaster safety circuits to supervise safety inputs and drive a guarded-machine output. Cataloged as the MSR9T variant within the Guardmaster 440R family, this unit reflects Rockwell Automation's MINOTAUR line of safety relays. Rockwell lists 440R-F23028 specifically as a Guardmaster MSR9T Safety Relay, and the product was discontinued on December 31, 2019, with a functional replacement and migration path described by Rockwell. Though discontinued, the MSR9T and related Guardmaster safety-relay options remain supported through migration guides that outline replacement products and paths to maintain safety-system compliance. This device is designed for industrial control systems that require reliable monitoring of safety inputs from sensors and interlocks to achieve a safe stop of machinery in accordance with safety standards.