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Allen Bradley

Allen Bradley 440N-Z21SS2HN9 RFID Non-Contact Safety Switch

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ManufacturerAllen Bradley

Part number440N-Z21SS2HN9

Actuation Type RFID coded, high-level

Outputs 2 N.C. safety + 1 N.O. auxiliary

Supply Voltage 24V DC (±10%)

Output Type PNP, short-circuit protected

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CAGE: 9NK75

Non-contact RFID-coded actuation 2 N.C. + 1 N.O. contact configuration 316L stainless steel housing IP69K washdown rating M12 4-pin connector High coding level per ISO 14119 LED status indication

Product description

The Allen-Bradley 440N-Z21SS2HN9 is a Guardmaster RFID-coded non-contact safety switch designed for hygienic and harsh industrial environments. It features a 316L stainless steel housing, IP69K rating for washdown resistance, and high tamper resistance due to its RFID coding. The switch includes two normally closed (N.C.) safety outputs and one normally open (N.O.) auxiliary output, with PNP output type and short-circuit protection.

This safety switch is ideal for applications in the food and beverage processing, pharmaceutical, and cleanroom machinery industries, as well as areas requiring high-moisture or chemical washdowns. Its non-contact design reduces wear, and it is tolerant to misalignment and vibration. The switch meets high safety standards, including ISO 14119, EN ISO 13849-1, IEC 61508 (up to SIL 3), and PLe.

Source your Allen-Bradley 440N-Z21SS2HN9 from Stanlo Automation, a veteran-owned distributor specializing in industrial surplus parts. We offer reliable components for your automation needs, ensuring you receive quality parts with prompt service. Trust Stanlo Automation for your critical MRO supplies.

Technical specifications

Actuation Type	RFID coded, high-level
Outputs	2 N.C. safety + 1 N.O. auxiliary
Supply Voltage	24V DC (±10%)
Output Type	PNP, short-circuit protected
Rated Current	250 mA max per output
Response Time	< 100 ms
Connector	M12, 4-pin
Operating Temperature	-25°C to +60°C
Enclosure Rating	IP67, IP69K
Housing Dimensions	80 x 30 x 15 mm
Standards	ISO 14119, EN ISO 13849-1, IEC 61508 (SIL 3), PLe

Common applications

Food and beverage processing

Pharmaceutical machinery

Cleanroom equipment

Washdown areas

Tamper-resistant guard monitoring

Packaging equipment

Automated systems

Compatible systems

Safety relays Safety controllers Allen-Bradley Guardmaster accessories

Also known as

440N-Z21SS2HN9, Allen Bradley SensaGuard, Guardmaster 440N, RFID Safety Switch

Replaces / compatible with

Compatible with Allen-Bradley Guardmaster 440N series accessories.

Technical note

Expert tip

The 440N-Z21SS2HN9 offers two safety NC outputs and one auxiliary NO output, suitable for series wiring with other safety devices up to SIL 3 / PLe.

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Frequently asked questions

What is the IP rating of the Allen-Bradley 440N-Z21SS2HN9 safety switch?

The Allen-Bradley 440N-Z21SS2HN9 safety switch features an IP67 and IP69K enclosure rating. This makes it suitable for harsh industrial environments and high-pressure washdown applications, ensuring protection against dust and water ingress.