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Allen-Bradley 440N-Z21S16B
by Allen-Bradley
Read verified buyer reviews ↓OverviewThe Allen-Bradley 440N-Z21S16B SensaGuard Non-Contact Interlock Switch delivers robust safety for demanding industrial environments. Engineered to provide superior protection where conventional contact mechanisms are insufficient, this advanced interlock is perfect for safeguarding both personnel and machinery. Its non-contact mechanism minimizes deterioration, guaranteeing an extended lifespan and reducing maintenance needs. With built-in LED door signaling and comprehensive diagnostic functionalities, operators can quickly assess the state of safety doors and resolve issues immediately, significantly boosting operational efficiency and decreasing downtime. The 440N-Z21S16B's accurate 15mm nominal detection range assures dependable activation and deactivation, making it a vital component for contemporary safety and security systems.Key Features Advanced Non-Contact Detection: Eliminates physical contact, decreasing wear and tear while ensuring a long operational life and improved reliability. Integrated LED Door Indicator & Diagnostics: Provides clear, real-time visual status updates for rapid monitoring and effective troubleshooting. Precise 15mm Detection Range: Guarantees accurate and consistent sensing for optimal safety and performance. Robust 18mm Plastic Cylindrical Barrel: Designed for exceptional durability and straightforward integration into many industrial setups. Versatile Safety & Auxiliary Outputs: Features 2 x PNP safety outputs (0.2A max) and 1 x PNP auxiliary output for adaptable system integration. 24V DC Operating Voltage: Standardized power requirement for effortless compatibility with most industrial control systems. Extended 10m PVC Cable: Offers ample length for flexible installation, reducing the need for extra wiring. Technical Specifications Model: 440N-Z21S16B Type: Non-Contact Interlock Switch Nominal Sensing Distance: 15mm Operating Voltage: 24V DC Actuator Type: 18mm Plastic Standard Code Safety Outputs: 2 x PNP, 0.2A max (Status: ON +24V DC) Auxiliary Output: 1 x PNP, 0.2A max Cable Type: 10m PVC Cable Status Indication: LED Door Indication/Diagnostic Size: 18mm Plastic Cylindrical Barrel Application: Safety & Security Systems in Industrial Machinery Applications Industrial Machinery Safety: Essential for guaranteeing the secure operation of protective gates and doors, preventing access to dangerous areas during use. Automation Systems Integration: Seamlessly connects with existing and new automated production lines to bolster overall system safety. Control Panel Monitoring: Delivers crucial diagnostic feedback and real-time status of door positions, enhancing operator awareness and enabling proactive safety measures. Packaging and Assembly Lines: Perfect for securing access to moving components, helping to prevent accidents and protect personnel. Robotics Safety Zones: Critical for defining secure perimeters around robotic arms, ensuring machinery stops when human presence is detected. Why Choose Allen-Bradley 440N-Z21S16B? Uncompromising Safety: Utilizing advanced non-contact technology, this switch offers superior protection without the mechanical wear common to traditional switches. Operational Efficiency: Real-time LED diagnostics and status indicators minimize troubleshooting time, keeping your operations running smoothly. Simplified Installation: The included 10m PVC cable and standard 18mm cylindrical barrel design make integration into diverse setups direct and cost-effective. Robust and Reliable: Constructed by Allen-Bradley, a leader in industrial automation, ensuring long-term performance and durability in harsh environments. Flexible Integration: Multiple PNP outputs provide the adaptability needed to connect with a wide array of safety controllers and industrial systems. Compliance and Peace of Mind: Designed to meet stringent safety standards, giving you confidence in the security of your industrial processes. Order NowElevate your industrial safety standards today. Experience superior protection and efficiency by ordering the Allen-Bradley 440N-Z21S16B SensaGuard Non-Contact Interlock Switch.FAQWhat are the primary benefits of a non-contact interlock switch?Non-contact interlock switches like the 440N-Z21S16B reduce mechanical wear, leading to a longer operational life and enhanced reliability compared to traditional contact switches.How does the integrated LED indication help in industrial environments?The integrated LED door indication provides clear, real-time visual status updates, allowing for quick monitoring and efficient troubleshooting, which minimizes downtime and boosts operational efficiency.What is the sensing distance of this Allen-Bradley interlock switch?The 440N-Z21S16B features a precise 15mm nominal sensing distance, ensuring accurate and consistent detection for optimal safety and performance.Can this switch be integrated into existing automation systems?Yes, with its 24V DC operating voltage and versatile PNP safety and auxiliary outputs, the 440N-Z21S16B is designed for seamless compatibility and integration with most industrial control systems and automated production lines.What industries typically use this type of safety sensing device?This device is commonly used in industrial machinery safety, automation systems, control panel monitoring, packaging and assembly lines, and robotics safety zones to enhance overall workplace safety.
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Allen-Bradley 440N-Z21S16B
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:
- Exact replacement — same Allen-Bradley catalog number, new or refurbished, tested and warrantied
- Form-fit-function equivalent — alternate revision or build that drops in without code changes
- 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: 440N-Z21S16B
- Type: Non-Contact Interlock Switch
- Nominal Sensing Distance: 15mm
- Operating Voltage: 24V DC
- Actuator Type: 18mm Plastic Standard Code
- Safety Outputs: 2 x PNP, 0.2A max (Status: ON +24V DC)
- Auxiliary Output: 1 x PNP, 0.2A max
- Cable Type: 10m PVC Cable
- Status Indication: LED Door Indication/Diagnostic
- Size: 18mm Plastic Cylindrical Barrel
- Application: Safety & Security Systems in Industrial Machinery
Applications
- Industrial Machinery Safety: Essential for guaranteeing the secure operation of protective gates and doors, preventing access to dangerous areas during use.
- Automation Systems Integration: Seamlessly connects with existing and new automated production lines to bolster overall system safety.
- Control Panel Monitoring: Delivers crucial diagnostic feedback and real-time status of door positions, enhancing operator awareness and enabling proactive safety measures.
- Packaging and Assembly Lines: Perfect for securing access to moving components, helping to prevent accidents and protect personnel.
- Robotics Safety Zones: Critical for defining secure perimeters around robotic arms, ensuring machinery stops when human presence is detected.
Why Choose the 440N-Z21S16B?
- Uncompromising Safety: Utilizing advanced non-contact technology, this switch offers superior protection without the mechanical wear common to traditional switches.
- Operational Efficiency: Real-time LED diagnostics and status indicators minimize troubleshooting time, keeping your operations running smoothly.
- Simplified Installation: The included 10m PVC cable and standard 18mm cylindrical barrel design make integration into diverse setups direct and cost-effective.
- Robust and Reliable: Constructed by Allen-Bradley, a leader in industrial automation, ensuring long-term performance and durability in harsh environments.
- Flexible Integration: Multiple PNP outputs provide the adaptability needed to connect with a wide array of safety controllers and industrial systems.
- Compliance and Peace of Mind: Designed to meet stringent safety standards, giving you confidence in the security of your industrial processes.
Availability & Shipping
- ▸In stock: 440N-Z21S16B 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-Z21S16B ships with a 1-Year PALM Parts warranty and a 30-day return window.
Frequently Asked Questions — Allen-Bradley
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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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.