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Allen-Bradley 440R-D23171 MSR125HP Two-Hand Control Safety Relay

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Allen-Bradley 440R-D23171

by Allen-Bradley

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OverviewThe Allen-Bradley 440R-D23171 MSR125HP Safety Relay is a crucial component for enhancing safety protocols in rigorous industrial settings. This advanced safety relay is specifically engineered for two-hand control operations, guaranteeing that operators maintain a secure distance from hazardous equipment by requiring simultaneous activation of two distinct controls. It features two normally open immediate safety outputs, providing exceptionally fast reaction times during critical situations. Built for adaptability, it functions efficiently with a 24V AC/DC power input and supports both automatic and manual reset methods, allowing for smooth integration into various control systems. Its robust construction, combined with convenient removable terminals, ensures dependable performance in essential safety functions while simplifying installation and upkeep.Key Features Two-Hand Control Mechanism: Maximizes operator security by mandating simultaneous input from two distinct controls, preventing single-hand operation and minimizing accident risks. Instantaneous Safety Outputs (2 N.O.): Delivers immediate disabling of dangerous machinery with two normally open safety outputs, vital for swift responses in urgent scenarios. Adaptable 24V AC/DC Power Supply: Compatible with a broad range of industrial power sources, ensuring extensive applicability and effortless integration. Automatic and Manual Reset Configurations: Provides operational flexibility, enabling prompt and efficient system reactivation tailored to specific application needs. Detachable Terminals: Simplifies the installation process and streamlines maintenance or replacement, reducing downtime and boosting operational efficiency. Resilient Industrial Construction: Built for endurance and consistent performance in challenging industrial conditions, guaranteeing lasting reliability. Technical Specifications Model: Allen-Bradley 440R-D23171 MSR125HP Type: Safety Relay Function: Two-Hand Control for enhanced operator protection Safety Outputs: 2 N.O. immediate safety outputs Auxiliary Outputs: None Delayed Safety Outputs: None Power Input: 24V AC/DC Reset Options: Automatic or Manual Reset Installation: Removable Terminals for easy servicing Compliance: Adheres to strict safety mandates for industrial uses Dimensions (H x W x D): 90 mm x 22.5 mm x 100 mm Mounting: DIN Rail Mountable Weight: 0.2 kg Applications Industrial Safety Systems: Essential for protecting personnel by precisely regulating machine operation and ensuring safety in high-risk industrial environments. Machine Control Applications: Crucial for machinery requiring two-hand safety control to actively prevent operator injury during operational cycles. Emergency Shutdown Systems (ESD): Integral to safety circuits for the prompt and reliable shutdown of machinery during unexpected emergency events. Presses and Forming Machines: Vital for safeguarding operator safety during repetitive tasks involving potentially hazardous equipment. Assembly Lines: Improves worker protection in automated and semi-automated assembly processes where human interaction with machinery is frequent. Why Choose This Model? Uncompromised Operator Safety: The integrated two-hand control feature significantly reduces the chance of accidents, fostering a more secure work environment. Dependable and Rapid Response: With two normally open immediate safety outputs, this relay ensures critical machinery stops instantly, protecting both operators and equipment. Versatile Power Compatibility: The 24V AC/DC power supply allows for seamless integration into various existing industrial control systems. Simplified Maintenance: Detachable terminals make installation, wiring, and replacement straightforward, thereby minimizing operational interruptions. Allen-Bradley Quality and Durability: As a product from a renowned industry leader, this relay guarantees high performance and enduring reliability in demanding applications. Order NowEnsure maximum safety in your industrial operations. The Allen-Bradley 440R-D23171 MSR125HP safety relay is available for immediate purchase. Contact us for pricing and availability.FAQWhat is the primary function of the Allen-Bradley 440R-D23171 MSR125HP safety relay?This safety relay is primarily designed for two-hand control applications, ensuring operators maintain a safe distance from hazardous machinery by requiring simultaneous activation of two separate controls.What type of safety outputs does this relay feature?It includes two normally open (N.O.) immediate safety outputs, providing rapid response times in emergency situations.Can this safety relay be used with different power sources?Yes, it is compatible with a flexible 24V AC/DC power supply, allowing for broad applicability in various industrial power systems.Does the Allen-Bradley 440R-D23171 offer different reset options?It provides both automatic and manual reset options, offering operational flexibility to suit different application requirements.How does this safety relay simplify installation and maintenance?It features removable terminals, which streamline the installation process and make maintenance or replacement straightforward, minimizing downtime.

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PRODUCT DETAILS

Allen-Bradley 440R-D23171

Overview

This is a genuine Allen-Bradley component. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.

Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.

Key Features

  • Genuine Allen-Bradley catalog part
  • Tested before shipment
  • Backed by PalmPartsSolution warranty
  • Cross-reference and revision assistance available
  • Compatible with the broader Allen-Bradley automation ecosystem

Compatibility

When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Allen-Bradley equipment. Where applicable, confirm:

  • Input/output voltage and current rating
  • Communication protocol and network role
  • Mounting form factor and footprint
  • Operating temperature, humidity, and IP rating
  • Required certifications (UL, CE, ATEX, marine, etc.)

Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.

Replacement Information

Three ways to source this part through PalmPartsSolution:

  1. Exact replacement — same Allen-Bradley catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Allen-Bradley platform with documented conversion notes

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

  • Model: Allen-Bradley 440R-D23171 MSR125HP
  • Type: Safety Relay
  • Function: Two-Hand Control for enhanced operator protection
  • Safety Outputs: 2 N.O. immediate safety outputs
  • Auxiliary Outputs: None
  • Delayed Safety Outputs: None
  • Power Input: 24V AC/DC
  • Reset Options: Automatic or Manual Reset
  • Installation: Removable Terminals for easy servicing
  • Compliance: Adheres to strict safety mandates for industrial uses
  • Dimensions (H x W x D): 90 mm x 22.5 mm x 100 mm
  • Mounting: DIN Rail Mountable
  • Weight: 0.2 kg

Applications

  • Industrial Safety Systems: Essential for protecting personnel by precisely regulating machine operation and ensuring safety in high-risk industrial environments.
  • Machine Control Applications: Crucial for machinery requiring two-hand safety control to actively prevent operator injury during operational cycles.
  • Emergency Shutdown Systems (ESD): Integral to safety circuits for the prompt and reliable shutdown of machinery during unexpected emergency events.
  • Presses and Forming Machines: Vital for safeguarding operator safety during repetitive tasks involving potentially hazardous equipment.
  • Assembly Lines: Improves worker protection in automated and semi-automated assembly processes where human interaction with machinery is frequent.

Why Choose the 440R-D23171?

  • Uncompromised Operator Safety: The integrated two-hand control feature significantly reduces the chance of accidents, fostering a more secure work environment.
  • Dependable and Rapid Response: With two normally open immediate safety outputs, this relay ensures critical machinery stops instantly, protecting both operators and equipment.
  • Versatile Power Compatibility: The 24V AC/DC power supply allows for seamless integration into various existing industrial control systems.
  • Simplified Maintenance: Detachable terminals make installation, wiring, and replacement straightforward, thereby minimizing operational interruptions.
  • Allen-Bradley Quality and Durability: As a product from a renowned industry leader, this relay guarantees high performance and enduring reliability in demanding applications.

Availability & Shipping

  • In stock: 440R-D23171 ready for immediate dispatch from our Florida warehouse.
  • Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
  • Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
  • Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
  • Buy with confidence: Every 440R-D23171 ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Allen-Bradley

This safety relay is primarily designed for two-hand control applications, ensuring operators maintain a safe distance from hazardous machinery by requiring simultaneous activation of two separate controls.

Machine down? We ship parts the same day.

New, surplus, and refurbished Allen-Bradley inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.

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PALM Parts Solution operates as an independent industrial automation supplier and is not an authorized distributor or affiliate of any listed manufacturer or brand name. Manufacturer trademarks and product names are used solely for identification purposes. Original manufacturer warranties do not apply. All products sold by PALM Parts are backed by our own 1-year warranty.

Product Condition & Firmware

All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.

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