Overview
The Allen-Bradley 440G-EZS21STL05H is a Guardmaster electromagnetic safety interlock switch built for guard locking applications in industrial machinery. This bulletin 440G-EZ interlocking switch is designed to enhance machine safety and reliably help protect a working process from unplanned downtime. The switch combines magnetic actuation with dual-channel safety contacts to ensure consistent access control and prevent unauthorized equipment operation.
Key Features
- Power-to-lock operation with 500N holding force magnetic actuator
- 2 normally closed safety contacts plus 1 normally open auxiliary contact
- 24VDC supply voltage with M12 QD 8-pin connector
- M12 quick-disconnect 8-pin connection type
- Aluminum construction
- UL Listed, CE certified, with TÃœV General Safety approval
Technical Specifications
- Supply Voltage: 24VDC
- Actuator Type: Magnetic
- Holding Force: 500N
- Safety Contacts: 2 NC (normally closed)
- Auxiliary Contacts: 1 NO (normally open)
- Contact Outputs: 2 PNP, 0.2A maximum
- Connection: M12 QD, 8-pin male
- Pigtail Length: 150 mm (6 inches)
- Material: Aluminum
- Operating Temperature: See manufacturer documentation
- Weight: 3.36 lb
- Certifications: UL Listed, CE, TÃœV General Safety, RCM, KC
Typical Applications
The 440G-EZS21STL05H is widely used for:
- Machine guard interlock applications
- Access door control systems on industrial equipment
- Safety gate locking for production machinery
- Hazardous energy control and lockout/tagout compliance
- Automated workstation perimeter protection
Compatibility & Replacements
This switch is part of Allen-Bradley’s Guardmaster 440G-EZ series of guard locking switches. The model designation 440G-EZS21STL05H indicates the STL05 actuator option with an M12 connector and pigtail lead termination. Verify compatibility with your existing installation and control logic before substitution. For equivalent alternatives or system integration support, consult Rockwell Automation documentation or your authorized distributor.
