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Allen Bradley 440G-LZS21SPLH
by Allen-Bradley
Read verified buyer reviews ↓OverviewElevate the safety standards of your industrial operations with the Allen-Bradley 440G-LZS21SPLH Guard Lock Safety Switch. This device is engineered for stringent machine guarding, offering superior access control and personnel protection in hazardous work areas. The 440G-LZS21SPLH uses a power-to-lock principle, ensuring that dangerous equipment remains securely locked until safe conditions are verified. Its advanced solid-state contacts provide swift and accurate switching, reducing response times and improving overall system integrity. Designed for straightforward integration and lasting performance, this guard lock switch is a vital element for modern industrial automation, featuring a durable yet lightweight plastic enclosure built to withstand daily use.Key Features Power-to-Lock Operation: Maintains a locked status when energized, preventing unauthorized entry during hazardous processes and ensuring adherence to machine guarding regulations. 2 N.C. Safety Contacts: Offers redundant normally closed safety contacts for dependable interlocking and immediate circuit interruption upon a safety breach, meeting rigorous safety requirements. 1 N.O. Auxiliary Contact: Includes a normally open auxiliary contact, allowing seamless monitoring of the guard lock switch's status within your control system for improved operational awareness. Solid-State Contacts: Utilizes cutting-edge solid-state technology for exceptionally fast, high-reliability switching operations and an extended lifespan, minimizing maintenance needs. Standard Coded Actuator: Incorporates a standard coded actuator, providing enhanced security and preventing circumvention, thereby reinforcing the safety of your machinery. 8-Pin DC Quick Disconnect (QD): Enables rapid and effortless installation and replacement with an 8-pin DC quick-disconnect connection, reducing downtime and streamlining maintenance. Durable Plastic Housing: Constructed from a lightweight yet exceptionally robust plastic material, offering excellent resistance to industrial environments while maintaining structural integrity. Technical Specifications Locking Mechanism: Power-to-Lock Safety Contacts: 2 Normally Closed (N.C.) Auxiliary Contact: 1 Normally Open (N.O.) Connection Type: 8-Pin DC Quick Disconnect (QD) Actuator Type: Standard Coded Housing Material: Plastic Applications Advanced Machine Guarding: Essential for securing safety gates, doors, and covers on machinery to prevent access during operational cycles, protecting personnel. Industrial Automation and Access Control: Integrates seamlessly into automated production lines and systems requiring strict access control to sensitive or dangerous zones. Robotics and Hazardous Machinery: Crucial for establishing secure interlocks on robotic cells and other dangerous equipment, safeguarding operators from moving parts. Conveyor System Safety Interlocks: Perfect for implementing dependable safety interlocks on conveyor systems to prevent injuries during maintenance or unexpected stoppages. Processing and Packaging Equipment: Provides reliable safety solutions for a broad range of processing and packaging machinery, ensuring worker protection and continuous operation. Why Choose This Model? Uncompromised Safety: The power-to-lock mechanism and dual N.C. safety contacts deliver a superior level of protection, adhering to the highest industrial safety standards. Exceptional Reliability: Solid-state contacts and a rugged design ensure consistent, enduring performance even in the most demanding industrial settings. Effortless Integration: The 8-pin DC quick-disconnect and standard coded actuator simplify installation and maintenance, significantly reducing operational downtime. Enhanced Security: The standard coded actuator prevents unauthorized tampering, strengthening the overall safety posture of your guarded machinery. Cost-Effective Durability: The robust plastic housing offers long-term resilience, contributing to a cost-effective safety solution. Order NowUpgrade your safety systems with the Allen-Bradley 440G-LZS21SPLH Guard Lock Safety Switch. Contact Palm Parts Solutions today for pricing and availability!FAQWhat is power-to-lock operation?Power-to-lock means the safety switch maintains a locked state when electrical power is applied. This prevents access to machinery until a safe condition is met and power is removed, offering enhanced protection against unauthorized entry during hazardous operations.What are the benefits of solid-state contacts?Solid-state contacts offer faster switching speeds, increased reliability, and a longer operational lifespan compared to traditional mechanical contacts. This reduces maintenance requirements and improves the overall responsiveness of your safety system.Is this switch easy to install?Yes, the Allen-Bradley 440G-LZS21SPLH features an 8-pin DC quick-disconnect (QD) connection and a standard coded actuator, which significantly simplifies both installation and replacement processes, minimizing downtime.
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Allen Bradley 440G-LZS21SPLH
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
- Locking Mechanism: Power-to-Lock
- Safety Contacts: 2 Normally Closed (N.C.)
- Auxiliary Contact: 1 Normally Open (N.O.)
- Connection Type: 8-Pin DC Quick Disconnect (QD)
- Actuator Type: Standard Coded
- Housing Material: Plastic
Applications
- Advanced Machine Guarding: Essential for securing safety gates, doors, and covers on machinery to prevent access during operational cycles, protecting personnel.
- Industrial Automation and Access Control: Integrates seamlessly into automated production lines and systems requiring strict access control to sensitive or dangerous zones.
- Robotics and Hazardous Machinery: Crucial for establishing secure interlocks on robotic cells and other dangerous equipment, safeguarding operators from moving parts.
- Conveyor System Safety Interlocks: Perfect for implementing dependable safety interlocks on conveyor systems to prevent injuries during maintenance or unexpected stoppages.
- Processing and Packaging Equipment: Provides reliable safety solutions for a broad range of processing and packaging machinery, ensuring worker protection and continuous operation.
Why Choose the 440G-LZS21SPLH?
- Uncompromised Safety: The power-to-lock mechanism and dual N.C. safety contacts deliver a superior level of protection, adhering to the highest industrial safety standards.
- Exceptional Reliability: Solid-state contacts and a rugged design ensure consistent, enduring performance even in the most demanding industrial settings.
- Effortless Integration: The 8-pin DC quick-disconnect and standard coded actuator simplify installation and maintenance, significantly reducing operational downtime.
- Enhanced Security: The standard coded actuator prevents unauthorized tampering, strengthening the overall safety posture of your guarded machinery.
- Cost-Effective Durability: The robust plastic housing offers long-term resilience, contributing to a cost-effective safety solution.
Availability & Shipping
- ▸In stock: 440G-LZS21SPLH 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 440G-LZS21SPLH 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.
Related Allen-Bradley resources
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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.