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Allen Bradley

Allen Bradley 440R-D22S2 Guardmaster Dual Input Safety Relay

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ManufacturerAllen Bradley

Part number440R-D22S2

Power Supply 24V DC

Safety Outputs 2 NO

Inputs Dual Universal Inputs

Performance Level PLe

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Veteran-owned

CAGE: 9NK75

Dual universal inputs 2 Normally Open safety outputs PLe and SIL 3 rated 24V DC operation DIN rail mounting

Product description

The Allen-Bradley 440R-D22S2 is a Guardmaster Dual Input Safety Relay engineered for monitoring safety-related circuits with high integrity. It offers two universal inputs compatible with a variety of safety devices and delivers two Normally Open (NO) safety outputs. This relay operates on a 24V DC power supply and is certified to PLe and SIL 3 safety performance levels, ensuring robust protection.

This dual input safety relay is well-suited for applications such as monitoring emergency-stop buttons, proximity switches, and safety mats within industrial machinery. Its compact design and DIN rail mounting facilitate straightforward integration into control cabinets. The unit holds certifications including UL, CUL, and KC.

Stanlo Automation, your veteran-owned surplus parts distributor, offers the Allen-Bradley 440R-D22S2. We provide reliable access to quality industrial automation components, ensuring your safety systems are maintained efficiently.

Technical specifications

Power Supply	24V DC
Safety Outputs	2 NO
Inputs	Dual Universal Inputs
Performance Level	PLe
SIL Rating	SIL 3
Width	22.5 mm

Common applications

Emergency-stop circuit monitoring

Proximity switch monitoring

Safety mat monitoring

Light curtain monitoring

Guard interlock monitoring

Also known as

Allen Bradley GSR Safety Relay, Guardmaster Dual Input Relay, 440R-D22S2 Safety Monitor

Replaces / compatible with

The 440R-D22S2 is designed to replace older dual-input safety relays and is suitable for new installations requiring high safety integrity. It is part of the Allen-Bradley Guardmaster series.

Technical note

Expert tip

This relay is designed for applications requiring high safety integrity, featuring dual inputs for redundancy and fault detection in safety circuits.

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Frequently asked questions

What is the power supply requirement for the Allen Bradley 440R-D22S2 safety relay?

The Allen Bradley 440R-D22S2 safety relay operates on a 24V DC power supply. This is a standard voltage for many industrial control and safety systems.