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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

Shop by interlock series

Related categories

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

  • Allen-Bradley 440K-T11428 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T11428 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11428Product Overview Allen-Bradley 440K-T11428 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...

    $225.00
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  • Allen-Bradley 440K-T11427 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T11427 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11427Product Overview Allen-Bradley 440K-T11427 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...

    $255.00
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  • Allen-Bradley 440K-T11426 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T11426 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11426Product Overview Allen-Bradley 440K-T11426 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...

    $255.00
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  • Allen-Bradley 440K-T11425 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11425 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11425Product Overview Allen-Bradley 440K-T11425 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...

    $240.00
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  • Allen-Bradley 440K-T11424 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11424 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11424Product Overview Allen-Bradley 440K-T11424 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-T11423 440K Interlock
    In Stock

    Allen-Bradley

    Allen-Bradley 440K-T11423 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11423Product Overview Allen-Bradley 440K-T11423 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...

    $198.90
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  • Allen-Bradley 440K-T11422 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11422 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11422Product Overview Allen-Bradley 440K-T11422 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...

    $315.00
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  • Allen-Bradley 440K-T11421 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T11421 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11421Product Overview Allen-Bradley 440K-T11421 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...

    $255.00
    Ask for Quote
  • Allen-Bradley 440K-T11420 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11420 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11420Product Overview Allen-Bradley 440K-T11420 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...

    $255.00
    Ask for Quote
  • Allen-Bradley 440K-T11419 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11419 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11419Product Overview Allen-Bradley 440K-T11419 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...

    $292.50
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  • Allen-Bradley 440K-T11418 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-T11418 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11418Product Overview Allen-Bradley 440K-T11418 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...

    $187.50
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  • Allen-Bradley 440K-T11417 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T11417 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T11417Product Overview Allen-Bradley 440K-T11417 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...

    $300.00
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