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Allen Bradley

Allen Bradley 440N-Z21US2H Guardmaster Non-Contact Safety Switch

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ManufacturerAllen Bradley

Part number440N-Z21US2H

Contact Configuration 2 N.C. Safety, 1 N.O Aux

Contact Type Solid State Contacts

Connection Type M12 Plug-in, 8 Pin DC QD

Housing Material Plastic

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12-month warranty

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Veteran-owned

CAGE: 9NK75

2 N.C. safety outputs 1 N.O. auxiliary output IP69K washdown rating M12 8-pin QD connector PLe, SIL 3, Cat 4 certified Rectangular plastic housing Series wiring capable

Product description

The Allen-Bradley 440N-Z21US2H is a Guardmaster non-contact safety switch featuring a rectangular plastic housing and an 8-pin M12 Micro QD connector. It is designed to ensure machine safety, equipped with two normally closed (N.C.) safety outputs and one normally open (N.O.) auxiliary output. The switch has an IP69K rating, making it suitable for washdown applications.

This safety switch is ideal for monitoring machine guards, gates, and enclosures in environments where hygiene and durability are critical. Its non-contact operation reduces wear, and the high IP rating ensures protection against dust and water. The switch supports connection in series with other safety components and maintains PLe, SIL 3, and Cat 4 ratings.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Allen-Bradley 440N-Z21US2H. We provide reliable industrial automation components to keep your operations safe and efficient. Trust Stanlo Automation for your surplus MRO needs.

Technical specifications

Contact Configuration	2 N.C. Safety, 1 N.O Aux
Contact Type	Solid State Contacts
Connection Type	M12 Plug-in, 8 Pin DC QD
Housing Material	Plastic
IP Rating	IP69K
Voltage	24 VDC
Safety Ratings	PLe, SIL 3, Cat 4

Common applications

Machine guarding

Washdown environments

Access control

Industrial automation

Safety interlocks

Food and beverage industry

Pharmaceutical industry

Compatible systems

Safety relays Safety controllers Allen-Bradley Guardmaster accessories

Also known as

440N-Z21US2H, Allen Bradley Guardmaster, SensaGuard, Non-Contact Interlock Switch

Replaces / compatible with

Compatible with Allen-Bradley Guardmaster 440N series accessories.

Technical note

Expert tip

The 440N-Z21US2H supports series wiring with up to 32 devices while maintaining Cat 4 / PLe safety levels.

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Frequently asked questions

What is the IP rating and suitability for washdown of the Allen-Bradley 440N-Z21US2H safety switch?

The Allen-Bradley 440N-Z21US2H safety switch features an IP69K rating, which means it is protected against dust and high-pressure, high-temperature water jets. This makes it highly suitable for use in washdown environments common in the food and beverage or pharmaceutical industries.