Allen-Bradley 440R-S35002 CU3 Monitored Safety Relay

Allen-Bradley 440R-S35002 CU3 Monitored Safety Relay is a back-EMF monitored safety controller in the Guardmaster 440R family. Powered from 110 VAC, it provides two normally open safety outputs and a normally closed auxiliary contact, all housed in a compact 45 mm-wide unit with fixed terminals. The CU3 control unit supports automatic or manual reset behavior, enabling you to choose how the system re-engages after a trip, while back-EMF monitoring helps prevent false trips due to coil energization. This monitored safety relay is designed for use with typical safety devices such as emergency stops, safety gates, and light curtains, delivering a controlled shutdown path whenever a safety input is violated. With its dedicated safety outputs and compact form factor, it is well suited for reliable machine guarding on mid- to large-scale equipment in manufacturing environments.