Product Description
The Allen-Bradley/Rockwell Automation 440R-M23084 Guardmaster Single-Function Safety Relay is a versatile safety relay designed primarily for machine safeguarding systems. It features a universal housing, configurable functions, and operates on 24V AC/DC with a 0.15-3ms time delay. Input options include one or two normally closed contacts, or a light curtain, while safety outputs consist of two normally open contacts. A delayed output option with two normally open and one normally closed contact (available as an accessory) is also included. The relay measures 99mm x 114.5mm x 45mm, consumes 4W, has infinite input simultaneity, a maximum input resistance of 135 Ohms, and offers manual or automatic reset monitoring.
Is Your Device Showing These Signs?
The Allen Bradley 440R-M23084 safety relay commonly experiences issues such as failed output channels due to excessive load or short circuits, requiring replacement of the relay or addressing the downstream wiring. Input signal failures are frequent, stemming from faulty safety devices, wiring problems, or incorrect voltage supply, necessitating thorough inspection and correction of the input circuit. Internal component degradation over time leads to operational errors and system shutdowns; replacing the unit is the appropriate solution. Configuration errors in the safety parameters cause unexpected behavior, demanding a review and adjustment of the safety configuration settings. Communication faults within the safety network disrupt data exchange, requiring troubleshooting of network connections and device addressing.
Technical specifications
The Allen-Bradley 440R-M23084 Guardmaster is a safety relay for machine safeguarding. It's a configurable, 24V AC/DC powered device with adjustable time delay (0.15-3ms). It accepts one or two NC contacts or a light curtain as input, and provides two NO safety outputs. A delayed output option (2NO/1NC) is available. Key specs include dimensions of 99mm x 114.5mm x 45mm, 4W power consumption, infinite input simultaneity, 135 Ohms maximum input resistance, and manual or automatic reset monitoring.
Our Repair Process for the
440R-M23084
Our repair process for the Allen Bradley 440R-M23084 safety relay begins with a comprehensive diagnostic evaluation to pinpoint the failure. For failed output channels, the relay is replaced or downstream wiring issues are corrected. Input signal failures require a meticulous inspection and correction of the input circuit, including safety devices, wiring, and voltage supply. Internal component degradation necessitates complete unit replacement. Configuration errors are addressed through a thorough review and adjustment of safety configuration settings. Communication faults demand immediate troubleshooting of network connections and device addressing to restore proper data exchange.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.


Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY