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Allen-Bradley 440N-Z21S17A
by Allen-Bradley
Read verified buyer reviews ↓OverviewThe Allen-Bradley 440N-Z21S17A SensaGuard Non-Contact Safety Switch offers an advanced solution for safeguarding both machinery and personnel in demanding industrial settings. This SensaGuard device incorporates sophisticated RFID technology, providing dependable and protected safety monitoring without requiring physical contact. This design minimizes wear, contributing to an extended operational lifespan. Encased in an 18mm stainless steel barrel, its robust construction ensures exceptional resilience against harsh operational conditions. This makes it an optimal selection for a broad spectrum of critical safety applications. By seamlessly integrating into existing safety infrastructure, the 440N-Z21S17A facilitates adherence to rigorous safety standards while simultaneously boosting operational efficiency. This non-contact safety switch represents a significant leap forward in industrial safety, providing a reliable and low-maintenance alternative to conventional mechanical interlocks.Key Features Advanced Non-Contact Safety Switching: Utilizes cutting-edge RFID technology for precise and secure machine protection without physical interaction, reducing mechanical wear and enhancing reliability. Durable Stainless Steel Construction: Housed within an 18mm stainless steel barrel, providing excellent resistance to corrosion, impact, and extreme temperatures, ensuring extended service life in challenging industrial settings. Configurable Safety Outputs: Equipped with two Normally Closed (N.C.) safety contacts for dependable safety circuit interruption and one Normally Open (N.O.) auxiliary contact for status monitoring or signaling. Standard Code RFID Technology: Offers a high level of tamper protection and security, preventing defeat by simple means and ensuring integrity of the safety function. Optimized Target Sensing: Designed for an 18mm target, ensuring accurate and consistent detection for reliable safety activation and deactivation. Flexible Cable Connection: Includes a 3-meter PVC cable, providing ample length and flexibility for straightforward installation and integration into diverse control panel configurations. Wide Operating Temperature Range: Engineered to perform reliably across a broad range of temperatures, ensuring consistent operation in various industrial climates. Technical Specifications Model: 440N-Z21S17A Switch Type: SensaGuard Non-Contact Safety Switch Brand: Allen-Bradley Material: Stainless Steel Barrel (18mm) Safety Contacts: 2 N.C. (Normally Closed) Auxiliary Contacts: 1 N.O. (Normally Open) Connection Type: 3m PVC Cable Coding Type: Standard Code RFID Target Size: 18mm Operational Principle: RFID Non-Contact Certifications: (Refer to product datasheet for specific certifications and standards compliance) Environmental Protection: (Refer to product datasheet for specific IP rating) Applications Machine Guarding Systems: Essential for protecting personnel from hazardous machinery movements by reliably detecting the open or closed state of safety gates, doors, and covers. Industrial Automation and Robotics: Critical for ensuring safety in automated production lines, robotic work cells, and other automated processes where human interaction is possible. Access Control in Hazardous Zones: Provides secure monitoring of access points to restricted or hazardous areas within manufacturing plants, preventing unauthorized entry during dangerous operations. Packaging and Material Handling Equipment: Enhances safety on conveyor systems, packaging machines, and other material handling machinery by monitoring guard positions. Food and Beverage Processing: Its stainless steel construction makes it suitable for environments requiring high levels of hygiene and resistance to washdowns and corrosive cleaning agents. Corrosive and Harsh Environments: Ideal for use in chemical processing plants, marine applications, and outdoor installations where resistance to rust and environmental degradation is paramount. Why Choose This Product?This Allen-Bradley SensaGuard switch stands out for its advanced safety features, robust construction, and reliable performance. By eliminating physical contact, it reduces maintenance needs and extends lifespan, offering significant long-term value. Its compliance with safety standards and adaptability across various demanding applications make it a superior choice for enhancing operational safety and efficiency.Order NowSecure your industrial operations with the Allen-Bradley 440N-Z21S17A SensaGuard Non-Contact Safety Switch. Contact us today to place your order or to learn more about how this advanced safety solution can benefit your specific application.FAQWhat is RFID technology and how does it benefit this safety switch?RFID (Radio-Frequency Identification) technology enables secure, non-contact detection, preventing tampering and minimizing wear compared to mechanical switches. This results in enhanced reliability and a longer operational life.Can this safety switch be used in wet or corrosive environments?Yes, the 18mm stainless steel barrel construction provides exceptional resistance to corrosion and harsh environmental conditions, making it suitable for washdown areas and corrosive environments like chemical processing plants.What is the benefit of having both N.C. and N.O. contacts?The two Normally Closed (N.C.) contacts ensure dependable safety circuit interruption, while the single Normally Open (N.O.) auxiliary contact allows for convenient status monitoring or signaling to your control system.How does the standard code RFID technology improve safety?Standard code RFID technology offers a high level of tamper protection, making it significantly more difficult to bypass the safety function through simple means, thereby ensuring the integrity of your safety system.Is this switch difficult to install?The included 3-meter PVC cable provides ample length and flexibility, facilitating straightforward installation and integration into various control panel configurations.
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Allen-Bradley 440N-Z21S17A
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-Z21S17A
- Switch Type: SensaGuard Non-Contact Safety Switch
- Brand: Allen-Bradley
- Material: Stainless Steel Barrel (18mm)
- Safety Contacts: 2 N.C. (Normally Closed)
- Auxiliary Contacts: 1 N.O. (Normally Open)
- Connection Type: 3m PVC Cable
- Coding Type: Standard Code RFID
- Target Size: 18mm
- Operational Principle: RFID Non-Contact
- Certifications: (Refer to product datasheet for specific certifications and standards compliance)
- Environmental Protection: (Refer to product datasheet for specific IP rating)
Applications
- Machine Guarding Systems: Essential for protecting personnel from hazardous machinery movements by reliably detecting the open or closed state of safety gates, doors, and covers.
- Industrial Automation and Robotics: Critical for ensuring safety in automated production lines, robotic work cells, and other automated processes where human interaction is possible.
- Access Control in Hazardous Zones: Provides secure monitoring of access points to restricted or hazardous areas within manufacturing plants, preventing unauthorized entry during dangerous operations.
- Packaging and Material Handling Equipment: Enhances safety on conveyor systems, packaging machines, and other material handling machinery by monitoring guard positions.
- Food and Beverage Processing: Its stainless steel construction makes it suitable for environments requiring high levels of hygiene and resistance to washdowns and corrosive cleaning agents.
- Corrosive and Harsh Environments: Ideal for use in chemical processing plants, marine applications, and outdoor installations where resistance to rust and environmental degradation is paramount.
Why Choose the 440N-Z21S17A?
This Allen-Bradley SensaGuard switch stands out for its advanced safety features, robust construction, and reliable performance. By eliminating physical contact, it reduces maintenance needs and extends lifespan, offering significant long-term value. Its compliance with safety standards and adaptability across various demanding applications make it a superior choice for enhancing operational safety and efficiency.
Availability & Shipping
- ▸In stock: 440N-Z21S17A 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-Z21S17A 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.