ALLEN-BRADLEY 440N-Z21SS3PA Guardmaster Contact Switch

( Brand: Allen-bradley ), ( Type: Plc Processor Module ), ( Unit Type: Unit ), ( Manufacturer Part Number: 440N-Z21SS3PA ), ( Controller Platform: Automate ), ( Country Of Origin: Dominican Republic )

Review ALLEN BRADLEY Factory Sealed Guardmaster 440n Non Contact Switch

The Allen-Bradley Model 440N-Z21SS3PA GuardMaster 440N Contact Switch is a versatile and reliable protective device designed to provide machine safety in various industrial applications. This switch is integral to the GuardMaster safety system, which offers a modular and cost-effective solution for implementing safety functions in machinery.

The 440N-Z21SS3PA Contact Switch is designed for normally open (NO) applications and is suitable for use in hazardous locations, specifically classified as Group D, Division 2. It is constructed of stainless steel, ensuring durability and resistance to harsh environments. The contact switch features a hermetically sealed design, providing protection against ingress of dust, water, and other contaminants, ensuring reliable operation even in challenging conditions.

The 440N-Z21SS3PA Contact Switch is designed to be easily integrated into a control system, with a DIN mounting size and a terminal configuration that accommodates both wiring and screw terminals. It is also equipped with a test switch, which allows for easy verification of switch functionality. The switch has a rating of 440V AC, 60Hz, and can handle a maximum current of 10A.

The GuardMaster safety system uses a variety of safety functions to protect against various machine hazards, such as motor overload, undervoltage, and machine startup and shutdown. The 440N-Z21SS3PA Contact Switch plays a critical role in these safety functions by providing reliable contact closure or openness, as required by the specific application.

In summary, the Allen-Bradley Model 440N-Z21SS3PA GuardMaster 440N Contact Switch is a robust and versatile safety device designed to provide reliable protective functionality in industrial applications, even in challenging environments. Its hermetically sealed design, stainless steel construction, and easy integration into control systems make it a valuable addition to any machine safety system.

The Allen-Bradley 440N-Z21SS3PA GuardMaster 440N Contact Switch is a versatile and reliable solution for machine safety applications. Here are some pros and cons to help you make an informed decision about purchasing this component.

1. Compact Design: The GuardMaster contact switch has a compact design, which makes it suitable for installation in tight spaces. Its size also makes it easier to integrate with other safety components in a machine safety system.

2. Easy Installation: The GuardMaster contact switch is easy to install, as it comes pre-wired and can be mounted directly to the machine or control panel. This can save time and labor costs during installation.

3. High Level of Safety: The GuardMaster contact switch is designed to meet the safety requirements of various industries, including machine safety standards such as EN, CE, and UL. It provides a high level of safety by ensuring that the machine is stopped before operators can access hazardous areas.

4. Durable Construction: The GuardMaster contact switch is built to withstand harsh environments, including dust, water, and extreme temperatures. Its rugged construction ensures that it can perform reliably in demanding applications.

5. Versatile: The GuardMaster contact switch is available in various configurations, including normally open, normally closed, and changeover versions. This makes it a versatile solution for a wide range of safety applications.

1. Cost: The GuardMaster contact switch may be more expensive than some other contact switches on the market. However, its high level of safety and reliability may justify the additional cost for some applications.

2. Limited Operating Temperature Range: The GuardMaster contact switch has a limited operating temperature range, which may not be suitable for extremely cold or hot environments.

3. Complex Wiring: The GuardMaster contact switch may require more complex wiring than some other contact switches due to its safety functions. This can make the installation process more time-consuming and require more expertise.

The Allen-Bradley 440N-Z21SS3PA GuardMaster 440N Contact Switch is a reliable and versatile solution for machine safety applications. Its compact design, easy installation, high level of safety, durable construction, and versatility make it an attractive option for many industries. However, its cost and limited operating temperature range may be drawbacks for some applications. Ultimately, the decision to purchase this component will depend on the specific safety requirements and budget of the application.

If safety is a top priority in your application and you have the budget for it, the Allen-Bradley 440N-Z21SS3PA GuardMaster 440N Contact Switch is a recommended choice. Its high level of safety and reliability make it a worthwhile investment for machine safety applications where operator safety is paramount. However, if cost is a significant concern, there may be other contact switches on the market that offer similar functionality at a lower cost. It's essential to evaluate the specific safety requirements and budget of your application before making a decision.

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part #: 440nz21ss3pa prices

• $159.00-$174.90

specifications plcmechanize:

• brand: Allen-bradley
• type: Plc Processor Module
• unit type: Unit
• manufacturer part number: 440N-Z21SS3PA
• controller platform: Automate
• country of origin: Dominican Republic

offer plcmechanize:

• availability: In Stock
• best offers: True
• sold: 0
• quantity: 2
• options: Ship-to-home
• started: May 19, 2026

seller plcmechanize:

• city: Bordentown, New Jersey
• # reviews: 39
• rating: 100.0%

returns plcmechanize:

• policy: Returns Accepted
• method: Money back
• paid by: Seller
• time: 30 Days

shipping plcmechanize:

• cost: $0.00
• class: Standard
• service: Standard
• type: Fixed
• transit: 4-10 Days

payments plcmechanize:

• credit card: Visa
• other
• wallet: Google-pay

general plcmechanize:

• Industrial Automation Motion Controls > PLCs HMIs > PLC Processors
• condition: New

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