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Interlocks & Guard Switches

Interlocks and Guard Switches (Industrial Machine Safety Interlocking)

Interlocks and guard switches are critical components in industrial machine safety systems. These devices monitor the position of safety gates, guard doors, and protective barriers to ensure machinery operates only when safe conditions are met. When a guard is opened or removed, the interlock switch signals the safety circuit to stop machine motion and prevent hazardous operation.

Industrial interlocks are widely used in automated production lines, packaging equipment, robotic cells, conveyors, and assembly systems. Using the correct interlock series ensures compatibility with existing machine guarding hardware and helps maintain reliable safety performance in demanding industrial environments.

This category includes refurbished interlock switches and guard monitoring devices used for maintenance replacement and spare inventory. Maintaining compatible replacement hardware allows facilities to repair machines quickly and minimize production downtime.

Typical interlock applications

  • Safety gate monitoring for robotic cells
  • Guard door monitoring on packaging equipment
  • Access control for automated production lines
  • Protective enclosure monitoring for hazardous machinery
  • OEM machine safety integration

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When replacing an interlock device, verify mounting orientation, actuator compatibility, electrical connections, and application requirements before installation to ensure the safety system functions correctly.

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    Allen-Bradley

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    About Allen-Bradley 440K-T11444Product Overview Allen-Bradley 440K-T11444 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $217.50
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    Allen-Bradley

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    About Allen-Bradley 440K-T11443Product Overview Allen-Bradley 440K-T11443 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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    Allen-Bradley

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    About Allen-Bradley 440K-T11442Product Overview Allen-Bradley 440K-T11442 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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  • Allen-Bradley 440K-T11441 440K Interlock New Surplus

    Allen-Bradley

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    About Allen-Bradley 440K-T11441Product Overview Allen-Bradley 440K-T11441 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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  • Allen-Bradley 440K-T11440 440K Interlock New Surplus

    Allen-Bradley

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    About Allen-Bradley 440K-T11440Product Overview Allen-Bradley 440K-T11440 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $157.50
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  • Allen-Bradley 440K-T11439 440K Interlock New Surplus

    Allen-Bradley

    Allen-Bradley 440K-T11439 440K Interlock (New Surplus)

    About Allen-Bradley 440K-T11439Product Overview Allen-Bradley 440K-T11439 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $157.50
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  • Allen-Bradley 440K-T11438 440K Interlock New Surplus

    Allen-Bradley

    Allen-Bradley 440K-T11438 440K Interlock (New Surplus)

    About Allen-Bradley 440K-T11438Product Overview Allen-Bradley 440K-T11438 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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  • Allen-Bradley 440K-T11437 440K Interlock New Surplus

    Allen-Bradley

    Allen-Bradley 440K-T11437 440K Interlock (New Surplus)

    About Allen-Bradley 440K-T11437Product Overview Allen-Bradley 440K-T11437 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $157.50
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  • Allen-Bradley 440K-T11436 440K Interlock New Surplus

    Allen-Bradley

    Allen-Bradley 440K-T11436 440K Interlock (New Surplus)

    About Allen-Bradley 440K-T11436Product Overview Allen-Bradley 440K-T11436 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $165.00
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    In Stock

    Allen-Bradley

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    About Allen-Bradley 440K-T11435Product Overview Allen-Bradley 440K-T11435 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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    Allen-Bradley

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    About Allen-Bradley 440K-T11434Product Overview Allen-Bradley 440K-T11434 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $277.50
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  • Allen-Bradley 440K-T11433 440K Interlock New Surplus

    Allen-Bradley

    Allen-Bradley 440K-T11433 440K Interlock (New Surplus)

    About Allen-Bradley 440K-T11433Product Overview Allen-Bradley 440K-T11433 is a refurbished 440K safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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