Allen-Bradley 440R-M23084 Guardmaster Safety Relay

Allen‑Bradley 440R‑M23084 Guardmaster MSR138.1DP Safety Relay is a 45 mm‑wide, removable safety relay module designed for machine guarding in industrial automation. The MSR138.1DP variant accepts a 24 V AC/DC supply and supports automatic or manual monitored operation, making it compatible with established Guardmaster safety networks while staying compact enough for crowded control panels. It provides two safety outputs with a selectable time delay from 0.15 to 3 seconds, enabling controlled activation of safety devices such as interlocks or emergency stop circuits without sacrificing rapid response when safety is required. Designed as part of the Guardmaster 440R family, this module keeps safety logic contained in a single, swappable unit and is commonly paired with other Guardmaster components to implement compliant safeguarding schemes in conveyors, presses, and other industrial equipment. With its 24 V input, dual safety outputs, 0.15–3 s delay, and removable 45 mm housing, the MSR138.1DP supports reliable coordination of safety devices across standard industrial control architectures.