The Rockwell / Allen-Bradley 440G-T27181 TLS-3 GD2 Release Guard Locking Switch is a tongue interlock safety switch designed to prevent unauthorized access to hazardous machinery during operation. This device requires insertion of a specific tongue actuator to enable guard closure and machinery operation, making it essential for personnel protection in industrial environments. Rated for SIL 3 and Performance Level e when integrated into properly designed safety systems, the switch meets relevant machine guarding standards including GD2 requirements.
Technical Specifications
• Product Series: 440G Guard Locking Switches
• Model: 440G-T27181
• Type: TLS-3 GD2 Release Guard Locking Switch
• Actuator Type: Tongue Interlock
• Safety Integrity Level (SIL): SIL 3 (when used in a properly designed safety system)
• Performance Level (PL): PL e (when used in a properly designed safety system)
• Contact Configuration: Includes safety contacts (positively driven) and monitoring contacts
• Reset Mechanism: Release Guard designation indicates solenoid or manual key release functionality
– Key Features
• Tongue-style actuator design ensures positive guard engagement prior to machinery enablement
• Positively driven safety contacts provide high-integrity switching for safety circuits
• Monitoring contacts enable system diagnostics and status verification
• Industrial-grade construction with metal or high-strength polymer housing
• Designed for harsh industrial environments with dust and water resistance
• Multiple contact switching elements for both safety and auxiliary functions
– Typical Applications
Ideal for machine guarding systems requiring SIL 3 / PL e rated interlocks, including automated manufacturing equipment, industrial presses, packaging machinery, and access gates where personnel safety demands proven safety integrity.
– Compatibility & Integration
The 440G-T27181 integrates into safety control systems designed to exploit its positively driven contacts and monitoring functions. Specific voltage ratings, current capacity, and contact arrangement must be referenced from the product datasheet for system design validation.
