Allen-Bradley 440R-ZBE820AZ1 Safety Expansion Relay

Allen‑Bradley Guardmaster 440R‑ZBE820AZ1 Safety Expansion Relay is the MSR19E expansion unit used to extend a Guardmaster safety network. It is designed to pair with two 440R‑EM4R2 expansion modules to realize MSR19E functionality in safety circuits. The module accepts power from 24 V AC/DC or 120 V AC sources and supports the typical MSR19E load configurations, including DC loads up to 2 A at 24 V and AC loads up to 1.5 A at 120–250 V, with a thermal (non‑switching) load rating around 8 A. Common applications include machine guarding and safety interlock schemes in industrial automation, where additional safety outputs are required in conjunction with Guardmaster safety relays.