Allen-Bradley 440R-H23179 GuardMaster Safety Relay

Allen-Bradley Guardmaster 440R-H23179 MSR221P Safety Relay is a modular dual-input safety relay designed to monitor two independent safety circuits within Guardmaster safety installations. The unit accepts two independent inputs configured as 1 normally closed or 2 normally closed contacts, and supports light-curtain interfaces when used as an MSR221P input module extension, all powered from a 24 V DC supply. As part of the Guardmaster 440R family, it interfaces with Guardmaster safety devices such as interlocks and safety sensors to help enforce a safe shutdown when a protected zone is breached. Rockwell Automation discontinued the 440R-H23179 on December 31, 2017 and lists 440R-D22R2 as its engineering replacement.