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Allen Bradley

Allen Bradley 440R-B23020 Guardmaster MSR5T Safety Relay

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ManufacturerAllen Bradley

Part number440R-B23020

Power Supply 24V AC/DC

Safety Outputs 3 NO

Auxiliary Outputs 1 NC

Safety Category CAT 3 Rated

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Veteran-owned

CAGE: 9NK75

3 Normally Open safety outputs Monitored reset capability 24V AC/DC operation DIN rail mount Safety Category 3 Rated

Product description

The Allen-Bradley 440R-B23020 is a Guardmaster MSR5T monitored safety relay designed for reliable safety applications. It operates on a 24V AC/DC power supply and features three Normally Open (NO) safety outputs, along with one NC relay output. This relay is suitable for monitoring emergency-stop circuits and other safety functions, meeting safety category 4 according to ISO 13849-1 and SIL 3 according to IEC 61508.

This safety relay is commonly used in machine safety systems to ensure proper shutdown in hazardous situations. Its versatility in reset methods (automatic, manual, monitored) and compliance with international standards make it a robust solution for various industrial environments, including manufacturing, assembly lines, and processing plants.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Allen-Bradley 440R-B23020. We provide access to quality industrial automation components, ensuring your safety systems are reliable and cost-effective.

Technical specifications

Power Supply	24V AC/DC
Safety Outputs	3 NO
Auxiliary Outputs	1 NC
Safety Category	CAT 3 Rated
Reset Method	Automatic, manual, monitored
Enclosure Width	22.5mm

Common applications

Machine safety monitoring

Emergency-stop circuits

Safety interlock monitoring

Conveyor systems

Automated assembly lines

Also known as

Allen Bradley MSR5T Safety Relay, Guardmaster Monitoring Relay, 440R-B23020 Safety Relay

Replaces / compatible with

The 440R-B23020 is part of the Guardmaster MSR5T series and can replace older MSR5T models or similar safety relays requiring comparable functionality and safety ratings.

Technical note

Expert tip

For monitored reset applications, ensure the external reset button is wired correctly to the designated input terminals to prevent unintended machine restart.

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Frequently asked questions

What reset methods does the Allen Bradley 440R-B23020 safety relay support?

The Allen Bradley 440R-B23020 safety relay supports automatic, manual, and monitored reset methods. This flexibility allows for integration into various safety control strategies based on specific machine requirements.