Safety Relay Guardmaster 24V DC/AC, Model 440R-M23084 | Allen-Bradley

Allen-Bradley Guardmaster 440R-M23084 Safety Relay, 24V DC/AC, Immediate and Delayed Stop

The Allen-Bradley Guardmaster 440R-M23084 safety relay is a versatile functional safety device designed for applications requiring both immediate stop and controlled (delayed) stop. Compatible with emergency stops (E-Stop) and safety sensors, it allows machinery to safely stop before guards are released. It operates at 24V DC/AC. Its compact 45mm design for DIN rail mounting facilitates integration into control panels, with removable terminals to simplify wiring and maintenance. Manufactured in the United States.

Applications

• Emergency stop (E-Stop) circuits in industrial machinery and production lines
• Monitoring of safety sensors: light curtains, safety mats, and access gates
• Controlled (delayed) stop for machinery with inertia or critical processes
• Functional safety systems in manufacturing, robotics, and industrial automation
• Operator protection in presses, stamping machines, and high-risk equipment
• Integration into control panels with SIL/PLd safety requirements

Technical Specifications

• Model: 440R-M23084 (Guardmaster MSR138.1DP)
• Brand: Allen-Bradley
• Type: Functional safety relay
• Supply voltage: 24V DC/AC
• Stop modes: Immediate and controlled (delayed)
• Applications: E-Stop, safety sensors, access gates
• Width: 45 mm
• Mounting: DIN rail
• Terminals: Removable (facilitates wiring and maintenance)
• Country of origin: United States

Other Common Names

• E-Stop safety relay 24VDC Allen-Bradley Guardmaster
• Safety relay MSR138.1DP Allen-Bradley 440R
• Emergency stop relay 24V DIN rail Rockwell
• Guardmaster safety relay 440R-M23084 24V DC/AC
• Functional safety relay for light curtains and mats
• Emergency stop relay 24VDC Allen-Bradley United States