Allen-Bradley 440R-N23126 MSR127T Safety Relay

The Allen-Bradley Guardmaster 440R-N23126 MSR127T Safety Relay is a compact, fixed-terminal single-function safety relay designed to monitor safety devices and enforce safe-stop conditions in industrial control circuits. This 24 V DC device, with automatic/manual reset, provides three safety contacts for wiring safety outputs and comes in a 22.5 mm-wide case optimized for panel mounting. As part of the Guardmaster MSR127T family, it will promptly switch off safety outputs when a fault is detected in the safety loop, enabling reliable integration with devices such as emergency stops, door interlocks, and safety light curtains. The catalog number 440R-N23126 identifies the MSR127T variant with fixed terminals and 24 V DC operation, a common choice for straightforward safety circuit implementations in automated equipment.