Overview
The Allen-Bradley 440G-EZS21STL05H is part of the Guardmaster family of safety interlocking switches manufactured by Rockwell Automation. This guard locking switch combines a magnetic actuator with a Power to Lock (PTL) design, making it ideal for access gates, hinged guards, and machine enclosures that require reliable, fail-safe interlock protection. The switch maintains position even during power loss, preventing unauthorized access and protecting personnel from moving machinery.
Key Features
- Power to Lock (PTL) design—solenoid-free operation maintains locked state without continuous power
- 500N magnetic holding force with 5mm tolerance to misalignment for robust, forgiving installation
- Dual contact outputs: 2 PNP safety contacts and 1 PNP auxiliary contact for door position feedback
- M12 male 8-pin quick-disconnect connector with 150mm (6 inch) pigtail for fast installation and serviceability
- 24 VDC operating voltage; no solenoid power requirement
- Certified to CE, UL, TÜV General Safety, Australian RCM, and Korean KC standards
Technical Specifications
- Actuator Type: Magnetic
- Operating Voltage: 24 VDC (solenoid N/A)
- Contact Configuration: 2 N.C. Safety, 1 N.O. Auxiliary
- Contact Output: 2 x PNP, max 0.2 A per contact
- Holding Force: 500 N magnetic
- Connector Type: M12 QD (Quick-Disconnect), 8-pin male
- Pigtail Length: 6 inches (150 mm)
- Housing Material: Aluminum
- Weight: 3.36 lb
- Product Series: Guardmaster 440G-EZ
- Certifications: CE, UL Listed, TÜV General Safety, Australian RCM, Korean KC
Typical Applications
The 440G-EZS21STL05H is specified for:
- Access gate interlocks on production machinery and transfer lines
- Hinged or sliding guard door monitoring on presses, punch machines, and shearing equipment
- Emergency stop interlock circuits requiring fail-safe position feedback
- Safety-rated control systems (CAT 3 / PLd and higher architectures)
- Retrofit and modernization projects requiring drop-in compatibility with Guardmaster ecosystem
Compatibility & Replacements
The 440G-EZS21STL05H is the standard safety interlock switch in the Guardmaster 440G-EZ product line. It integrates directly with Rockwell Automation CompactLogix and ControlLogix safety I/O modules via standard M12 connectors. Compatible with all Allen-Bradley guard locking switch actuators in the Guardmaster catalog. When upgrading legacy mechanical interlocks, confirm existing mounting footprint and connector type. Consult Rockwell Automation technical documentation or your authorized distributor for cross-reference and compatibility matrix.
