Allen-Bradley 440R-G23110 Safety Monitoring Relay

Configured for safety circuit monitoring and interlocking stop execution in industrial safety systems, the Allen-Bradley 440R-G23110 (440RG23110 safety relay module) provides direct physical and electrical execution across machine emergency stop and light curtain loops.

Hardware Specifications

Intrinsic safety (Ex i) barriers

The Allen-Bradley 440R-G23110 integrates dual-channel input monitoring circuitry designed to interface with electromechanical emergency stop buttons, safety gate switches, and solid-state light curtains. It executes fault-state verification across every power-up cycle, maintaining strict surge voltage protection limits and DIN-rail mounting stability within control panels. The module switches high-capacity safety outputs while providing galvanic isolation between field input circuits and internal control logic.

Frequently Asked Questions

Q: Can the 440R-G23110 safety relay be powered by standard 120 VAC control lines?

A: No. This specific model requires a regulated 24 VAC or 24 VDC power supply. Connecting line voltage directly will damage the internal transformer and power circuits.

Q: What input device configurations are compatible with the monitoring terminals?

A: The module accepts single NC, dual NC (2NC), or light curtain solid-state safety inputs depending on the selected terminal wiring jumper configuration.

Q: How are internal contact faults detected during operation?

A: The internal cross-monitoring logic checks for simultaneous contact closure on dual input channels, tripping the safety outputs to an open state if a discrepancy occurs.

Field Installation Guidelines

1. Power Isolation: Completely de-energize and lock out all control enclosure power feeds before touching terminal blocks or mounting the relay.
2. DIN-Rail Mounting: Snap the unit securely onto a standard 35 mm DIN-rail inside the safety control enclosure, ensuring proper vertical clearance for airflow.
3. Safety Input Wiring: Connect emergency stop pushbuttons or light curtain safety outputs to the designated input terminals, maintaining correct channel synchronization. To verify successful wiring, use a multimeter to check that continuity is established across the closed input channels only when safety devices are unactuated.
4. Output and Power Termination: Wire the 24 VDC/AC power supply and connect the 5 NO safety contacts in series with your machine primary actuator control circuits. To verify successful output integration, measure voltage across the safety output contacts to confirm they switch cleanly when the reset condition is satisfied.