Product Overview

The Allen-Bradley 440R-G23029A​ is a versatile, configurable safety relay module that forms a core component of the GuardMaster family of safety products from Rockwell Automation. Designed as a hard-wired safety controller, this device provides a reliable and certified solution for monitoring safety input devices and controlling safety outputs to bring machinery to a safe state. The primary function of the 440R-G23029A GuardMaster Safety Relay​ is to evaluate the status of safety switches—such as emergency stop buttons, safety gate interlocks, light curtains, or two-hand control stations—and, based on their signals, safely control the de-energization of power to machine hazards. It implements a dual-channel monitoring architecture, requiring the correct, synchronized signals from two separate input circuits to maintain its safety outputs in an energized (RUN) state. Any fault, mismatch, or open circuit in the monitored safety loop causes the relay to de-energize its safety contacts, initiating a safety stop function.As part of the GuardMaster 440R series, the Allen-Bradley 440R-G23029A​ is engineered to simplify the implementation of safety circuits that comply with international standards like ISO 13849-1 and IEC 62061. Its value lies in providing a pre-certified, self-contained safety logic unit that reduces design complexity, wiring, and validation time compared to building safety functions with general-purpose relays. The module typically features forcibly guided (mechanically linked) safety contacts, a critical design element where a welded contact will prevent other contacts from closing, ensuring a safe failure mode. The 440R-G23029A​ is designed for easy integration into control panels, with a compact form factor, clear status indication via LEDs, and a removable terminal block for straightforward wiring. It serves as a dependable and cost-effective “safety brain” for a wide range of machinery, ensuring that safety functions are executed with the high reliability and diagnostic coverage required to achieve Performance Level d (PL d) or Category 3/4 safety circuits.

Technical Specifications

Main Features and Advantages

The Allen-Bradley 440R-G23029A​ excels through its flexibility and certified safety architecture. A key feature is its configurability via a rotary switch or internal jumpers, allowing it to be adapted for different safety functions without changing hardware. It can be set for monitoring a single dual-channel E-stop circuit, a safety gate with or without guard locking, or a two-hand control station. This versatility makes the 440R-G23029A GuardMaster Safety Relay​ a single, stockable component for many different safety applications. The module incorporates sophisticated internal monitoring, including cross-circuit detection to ensure both input channels operate correctly and synchronously. It can detect faults like short circuits between the channels, welded contacts on input devices, and discrepancies in signal timing, providing a high level of diagnostic coverage (DC) that is essential for achieving Category 3 or 4 performance.Reliable Safety Outputs and Ease of Use: The safety outputs of the 440R-G23029A​ are based on forcibly guided relays. This mechanical linkage ensures that if a normally open (NO) safety contact welds shut, the corresponding normally closed (NC) auxiliary contact is prevented from closing, which can be monitored by a higher-level controller to indicate a fault. This design guarantees a safe state upon failure. The module features clear visual diagnostics with multiple LEDs that indicate power, the status of each input channel, the state of the safety outputs, and any internal faults, dramatically simplifying troubleshooting. Its compact, DIN-rail mountable design saves panel space, and the removable terminal block speeds installation and maintenance. The Allen-Bradley 440R-G23029A​ is designed for seamless integration within the Rockwell ecosystem, but its standard 24V DC operation and contact-based outputs make it universally compatible with any control system, offering a robust, off-the-shelf safety solution that reduces engineering and validation overhead.