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Allen Bradley Guardmaster Safety Relays 440R-D23171

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440R-D23171

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The 440R-D23171 from Allen Bradley is a safety relay designed for critical applications. This unit functions at a power supply voltage of 24 V DC/AC and can be reset automatically or manually. It features two Normally Open (NO) safety outputs with a current rating of 4 A.

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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 440R-D23171

ManufacturerAllen Bradley
Product TypeSafety Relay
Product LineGuardmaster Safety Relays
Part Number440R-D23171
Weight5.00 lbs (2.27 kg)
UPC611320826432
Power Supply Voltage24 Volts DC/AC
Reset MethodAutomatic or manual reset
Number of Safety Outputs2 Normally Open (NO) immediate safety outputs
Current Rating4 Amperes at 24 Volts DC
Terminal TypeRemovable terminal
Mounting Method35 millimeters DIN rail mount
Maximum Input Resistance40 ohms
Input Response Time20 milliseconds
Rated Impulse Withstand Voltage2,500 Volts
Compatible Conductor Size24 to 12 American Wire Gauge (AWG)
Input SimultaneityLess than 0.5 seconds
Mechanical Life Span2 million operations
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The Allen Bradley 440R-D23171 safety relay is engineered for use in safety-critical environments. It supports a power supply voltage of 24 Volts, whether in direct current or alternating current configurations. An important feature of this relay is the dual Normally Open (NO) safety outputs, capable of handling up to 4 amperes each at the specified operating voltage. It can reset either automatically or through manual means, allowing for versatile usage depending on the system requirements.

Equipped with removable terminals, this relay simplifies the installation and maintenance process. It mounts on a 35 mm DIN rail, making it well-suited to standard industrial panel setups. Its maximum input resistance stands at 40 ohms, with a fast input response time of 20 milliseconds, ensuring that it reacts appropriately within demanding applications. The rated impulse withstand voltage for this relay reaches an impressive 2,500 Volts, providing an additional safety margin during surges or transients.

Compatibility with conductor sizes from 24 AWG to 12 AWG allows for flexible wiring options in installations. The input simultaneity requirement, less than 0.5 seconds, ensures efficient and reliable performance. This relay is built for longevity, with a mechanical lifespan rated at around 2 million operations, making it a dependable component in safety-related applications.