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Allen-Bradley 440K-T11335 Safety Interlock Switch

1. Product Description

The Allen-Bradley 440K-T11335 is a safety interlock switch from the Guardmaster 440K series, designed to enhance machine safety by preventing unauthorized access to hazardous areas. It features a key-operated mechanism that ensures machine control circuits are only active when the protective door or gate is securely closed. This switch is commonly used in industrial automation to comply with ISO 13849-1 (PLe/SIL 3) safety standards.

2. Key Features

Key-Operated Interlock – Uses a stainless steel actuator key to ensure secure locking and prevent tampering.
Compact & Durable Design – Measures 75 × 52 × 32 mm, with a glass-filled PBT housing for high impact resistance.
High Protection Rating (IP67) – Resistant to dust, water, and harsh industrial environments.
Multiple Actuator Positions – Rotatable head allows up to 4 actuator entry points, increasing installation flexibility.
Safety & Auxiliary Contacts – Includes 1 Normally Closed (NC) safety contact and 1 Normally Open (NO) auxiliary contact for control circuit integration.
Wide Voltage Rating – Supports 600V AC/DC, making it suitable for various industrial applications.
GuardLink Compatibility – Can be integrated with Allen-Bradley’s GuardLink system for real-time diagnostics via EtherNet/IP.

3. Technical Specifications

Parameter	Specification
Lock Type	Key-operated (Trojan T15)
Contact Configuration	1NC (Safety) + 1NO (Auxiliary)
Voltage Rating	600V AC/DC
Current Rating	2.2A (Safety), 6A (Auxiliary)
Housing Material	Glass-filled PBT (UL-certified)
Operating Temperature	-20°C to +80°C
Dimensions	75 × 52 × 32 mm
Protection Rating	IP67
Certifications	CE, cULus, TÜV, ISO 13849-1 (PLe/SIL 3)

4. Applications

Machine Guarding – Ensures safety in presses, robotic cells, and automated assembly lines.
Packaging & Material Handling – Prevents machine operation when access doors are open.
Automotive Manufacturing – Used in welding stations and conveyor safety systems.
Food & Beverage Processing – IP67 rating makes it suitable for washdown environments.

5. Installation & Precautions

Proper Alignment – Ensure the actuator key is securely fixed to the door for reliable operation.
Wiring Compliance – Use shielded cables to prevent electrical noise interference.
Environmental Limits – Avoid exposure to corrosive chemicals or temperatures beyond -20°C to +80°C.
Safety Validation – Perform functional tests after installation to ensure compliance with ISO 13849-1.