Free Shipping Across the USA — Worldwide Delivery Available!
PALM Parts Solution
AccountQuote
In Stock Fast Shipping Available
Allen-Bradley 440N-Z21SS2HN SensaGuard Non-Contact Safety Interlock Switch

*Image shown is a representation only. Actual product may vary.

Allen-Bradley 440N-Z21SS2HN

by Allen-Bradley

Read verified buyer reviews ↓

OverviewElevate the safety of your industrial operations with the Allen-Bradley 440N-Z21SS2HN SensaGuard Non-Contact Safety Interlock Switch. This robust safety solution by Allen-Bradley, a leader in industrial automation, is engineered to provide reliable and efficient machine guarding. Designed with a rectangular plastic sensor and a matching standard code actuator, the 440N-Z21SS2HN integrates seamlessly into diverse control systems. Its advanced SensaGuard technology ensures a secure non-contact interlock, critical for protecting personnel and equipment in hazardous environments. With a generous 25mm assured sensing distance, this switch offers exceptional performance for a wide range of applications, from door monitoring to complex safety interlocking scenarios. The inclusion of LED indicators and margin indication simplifies setup and real-time diagnostics, making it an invaluable component for maintaining operational continuity and safety compliance. Furthermore, its IO-Link capability positions this switch for future-proof integration into smart factory ecosystems.Key Features SensaGuard Non-Contact Technology: Provides superior reliability and extended lifespan compared to traditional mechanical switches, ensuring consistent safety interlocking without physical wear. 25mm Assured Sensing Distance: Offers a wide and forgiving operating range, simplifying installation and reducing alignment complexities while maintaining robust safety performance. Integrated LED Diagnostics: Clear visual feedback on door status and sensor operation streamlines troubleshooting and minimizes downtime, maximizing operational efficiency. IO-Link Capable: Enables advanced communication for comprehensive diagnostics, data acquisition, and seamless integration into modern industrial control networks for predictive maintenance and enhanced system intelligence. Durable Rectangular Plastic Design: Built for harsh industrial environments, the rugged plastic housing for both sensor and actuator ensures longevity and resistance to common industrial contaminants. Easy Connectivity: Equipped with a 6-inch pigtail and an 8-pin Micro (M12) connector for quick, secure, and hassle-free installation into existing systems. Margin Indication for Simplified Setup: Provides visual feedback on signal strength, allowing for optimal sensor positioning and ensuring reliable operation from the outset. Technical Specifications Product Type: Non-Contact Safety Interlock Switch Catalog Number: 440N-Z21SS2HN Sensing Method: Non-Contact via SensaGuard Technology Sensing Distance: 25 mm (0.98 in.) Actuator Type: Rectangular Plastic, Standard Code Connection: 6-inch Pigtail with 8-Pin Micro (M12) Connector Diagnostics: LED Indication for Door Status and Margin Indication IO-Link: Yes, for advanced communication and diagnostics Housing Material: Plastic (Sensor and Actuator) Certifications: Designed to meet relevant industry safety standards. Applications Machine Guarding: Essential for safeguarding operators near moving machinery by ensuring guards are closed before operation. Safety Interlocking Systems: Prevents hazardous machine functions until all safety conditions, such as closed doors or gates, are met. Industrial Door and Gate Monitoring: Provides reliable status feedback for access points in automated or safety-critical zones. Conveyor System Safety: Integrates into emergency stop circuits or access control for conveyor lines, preventing accidents. Robotic Workcell Protection: Critical for ensuring safety barriers surrounding robotic cells are properly secured. Access Control for Hazardous Areas: Manages entry and exit to zones with potential risks, enhancing overall facility safety. Why ChooseThe Allen-Bradley 440N-Z21SS2HN leverages advanced SensaGuard technology to deliver a superior level of non-contact safety interlocking, reducing the risk of accidents and ensuring compliance with stringent safety regulations. Enhanced Reliability: With no mechanical wear, SensaGuard technology minimizes maintenance and increases the operational lifespan of the switch compared to traditional methods. Simplified Integration: IO-Link capability allows for straightforward connection into modern industrial networks, providing valuable diagnostic data and enabling smarter, more efficient safety systems. Ease of Installation and Operation: Features like the 25mm sensing distance, LED diagnostics, and margin indication ensure quick setup, easy troubleshooting, and consistent performance. Versatile Application: Suitable for a broad spectrum of industrial environments, this switch offers a flexible solution for various machine guarding and safety interlock requirements. Choosing the Allen-Bradley 440N-Z21SS2HN means investing in a high-performance, durable, and intelligent safety solution that contributes to a safer, more productive industrial operation.Order NowSecure your operations with the Allen-Bradley 440N-Z21SS2HN Safety Interlock Switch. Contact us today to place an order or to learn more about how this advanced safety solution can benefit your facility.FAQWhat is the primary function of the 440N-Z21SS2HN?The 440N-Z21SS2HN is a non-contact safety interlock switch designed to enhance industrial safety by ensuring machine guards are properly closed before hazardous operations can begin.How does SensaGuard technology improve safety?SensaGuard technology provides a non-contact sensing method, eliminating wear and tear associated with mechanical switches, which leads to greater reliability and a longer operational lifespan for consistent safety interlocking.What is the sensing distance of this switch?The switch features an assured sensing distance of 25 mm (0.98 inches), offering flexible installation and robust performance across various applications.Does this switch support IO-Link?Yes, the 440N-Z21SS2HN is IO-Link capable, enabling advanced communication, diagnostics, and seamless integration into contemporary industrial control networks for enhanced system intelligence.What environments is this switch suitable for?Built with a durable rectangular plastic design for both the sensor and actuator, this switch is ideal for harsh industrial environments, offering resistance to common contaminants and ensuring longevity.

🇺🇸 Ships from our Florida warehouse
1-Year PALM Parts Warranty
CONDITION
$400.99
14 in stock

USA — Free FedEx Priority & UPS Ground · Worldwide shipping available

For more quantity please contact Customer Service

Experts Available 24/7 · 365
+1 (689) 263-1985
sales@palmpartssolution.com

Fast Shipping

Dispatched quickly on in-stock items via UPS, FedEx & DHL worldwide.

Availability

Thousands of parts in stock — ready for immediate dispatch from Florida.

Payment Flexibility

AMEX, Visa, MasterCard, PayPal, Discover and wire transfer accepted.

PRODUCT DETAILS

Allen-Bradley 440N-Z21SS2HN

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

  • Product Type: Non-Contact Safety Interlock Switch
  • Catalog Number: 440N-Z21SS2HN
  • Sensing Method: Non-Contact via SensaGuard Technology
  • Sensing Distance: 25 mm (0.98 in.)
  • Actuator Type: Rectangular Plastic, Standard Code
  • Connection: 6-inch Pigtail with 8-Pin Micro (M12) Connector
  • Diagnostics: LED Indication for Door Status and Margin Indication
  • IO-Link: Yes, for advanced communication and diagnostics
  • Housing Material: Plastic (Sensor and Actuator)
  • Certifications: Designed to meet relevant industry safety standards.

Applications

  • Machine Guarding: Essential for safeguarding operators near moving machinery by ensuring guards are closed before operation.
  • Safety Interlocking Systems: Prevents hazardous machine functions until all safety conditions, such as closed doors or gates, are met.
  • Industrial Door and Gate Monitoring: Provides reliable status feedback for access points in automated or safety-critical zones.
  • Conveyor System Safety: Integrates into emergency stop circuits or access control for conveyor lines, preventing accidents.
  • Robotic Workcell Protection: Critical for ensuring safety barriers surrounding robotic cells are properly secured.
  • Access Control for Hazardous Areas: Manages entry and exit to zones with potential risks, enhancing overall facility safety.

Why Choose the 440N-Z21SS2HN?

The Allen-Bradley 440N-Z21SS2HN leverages advanced SensaGuard technology to deliver a superior level of non-contact safety interlocking, reducing the risk of accidents and ensuring compliance with stringent safety regulations. Enhanced Reliability: With no mechanical wear, SensaGuard technology minimizes maintenance and increases the operational lifespan of the switch compared to traditional methods. Simplified Integration: IO-Link capability allows for straightforward connection into modern industrial networks, providing valuable diagnostic data and enabling smarter, more efficient safety systems. Ease of Installation and Operation: Features like the 25mm sensing distance, LED diagnostics, and margin indication ensure quick setup, easy troubleshooting, and consistent performance. Versatile Application: Suitable for a broad spectrum of industrial environments, this switch offers a flexible solution for various machine guarding and safety interlock requirements. Choosing the Allen-Bradley 440N-Z21SS2HN means investing in a high-performance, durable, and intelligent safety solution that contributes to a safer, more productive industrial operation.

Availability & Shipping

  • In stock: 440N-Z21SS2HN 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 440N-Z21SS2HN ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Allen-Bradley

The 440N-Z21SS2HN is a non-contact safety interlock switch designed to enhance industrial safety by ensuring machine guards are properly closed before hazardous operations can begin.

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.

CUSTOMER REVIEWS

What Verified Buyers Say

No reviews yet for this product. Be the first verified buyer to share your experience — we email a review invitation after every purchase.

Independent Supplier Notice

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.

Are you an Electrical Distributor?Learn more about our distributor program

PALM Parts Solution sells used surplus products. PALM Parts Solution is not an authorized distributor, affiliate, or representative for the brands we carry. Products sold by PALM Parts Solution come with PALM Parts Solution's 1-Year Warranty and do not come with the original manufacturer's warranty. Designated trademarks, brand names and brands appearing herein are the property of their respective owners. This website is not sanctioned or approved by any manufacturer or tradename listed.

Read full disclaimer →