Allen-Bradley 440R-H23180 Guardmaster Safety Relay

Allen-Bradley Guardmaster 440R-H23180 MSR230P is a modular monitoring safety relay and output expansion module designed for the Guardmaster Minotaur safety-relay family. It provides four 24 V DC normally open safety outputs, enabling expansion of safety-control circuits such as emergency-stop arrays, door interlocks, and other safety sensors when paired with a base MSR230P unit. The device features removable terminals to simplify field wiring and is marketed as an MSR230P output expansion module within the 440R family, intended to extend the number of safe-output channels in a single control network. As part of the Guardmaster line, it is used in industrial safety applications to monitor multiple safety devices and ensure safe shutdown or safe-state behavior in automated equipment. The 440R-H23180 designation ties the MSR230P expansion with the 440R monitoring-relay platform, offering a compact, modular approach to configuring safety outputs in control panels and machine safety circuits.