440G-LZS21STLH

Overview of Allen-Bradley 440G-LZS21STLH Guardmaster Auxiliary Door Proximity Guard Locking Switch

The Allen-Bradley 440G-LZS21STLH is a Guardmaster guard locking switch featuring a standard RFID coded actuator and a solenoid locking mechanism controlled by a 24 V DC solenoid. It offers high safety performance with PLe, Cat 4, SIL 3 certifications for guard position and lock monitoring. This switch is designed for partial body access guards and integrates advanced microprocessor technology to ensure secure and reliable locking only when the correct actuator is detected.

Key Features of 440G-LZS21STLH

• Two safety PNP outputs and one auxiliary PNP output (2PNP-1PNP) with 0.2 A max at 24 V DC.
• Power-to-lock solenoid actuator with continuous monitoring of locking bolt insertion.
• RFID coded actuator prevents unauthorized access and tampering.
• Certified to the highest safety levels: PLe (ISO 13849-1), Category 4, SIL 3 (IEC 62061 and IEC 61508).
• Operating temperature range: 0 to 55 °C (32 to 131 °F).
• Rated for IP66, IP67, IP69K, NEMA Type 3, 4, 12, and 13 environments, appropriate for rugged industrial use.
• Compact and optimized for ease of mounting on safety guard doors.
• Diagnostic and status feedback provided by two bright 270º visible LEDs.
• Connector interface: 8-pin M12 micro quick-disconnect for reliable connections.
• Energy-efficient design consuming only 2.5 W power.

Technical Specifications

Applications / Use Cases

The 440G-LZS21STLH switch is used in safety-critical applications involving partial body access guards, securing machine guards, and interlocking doors in industrial automation. Its RFID security and power-to-lock feature make it ideal for high-security environments requiring compliance with the highest safety standards.