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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 440L-AF6123 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6123 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6123Product Overview Allen-Bradley 440L-AF6123 is a refurbished 440L 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 440L-AF6122 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6122 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6122Product Overview Allen-Bradley 440L-AF6122 is a refurbished 440L 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 440L-AF6121 440L Interlock

    Allen-Bradley

    Allen-Bradley 440L-AF6121 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6121Product Overview Allen-Bradley 440L-AF6121 is a refurbished 440L 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 440L-AF6120 440L Interlock

    Allen-Bradley

    Allen-Bradley 440L-AF6120 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6120Product Overview Allen-Bradley 440L-AF6120 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $135.00
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  • Allen-Bradley 440L-AF6112 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6112 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6112Product Overview Allen-Bradley 440L-AF6112 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $82.50
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  • Allen-Bradley 440L-AF6110 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6110 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6110Product Overview Allen-Bradley 440L-AF6110 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $97.50
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  • Allen-Bradley 440L-AF6109 440L Interlock

    Allen-Bradley

    Allen-Bradley 440L-AF6109 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6109Product Overview Allen-Bradley 440L-AF6109 is a refurbished 440L 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 440L-AF6108 440L Interlock

    Allen-Bradley

    Allen-Bradley 440L-AF6108 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6108Product Overview Allen-Bradley 440L-AF6108 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $150.00
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  • Allen-Bradley 440L-AF6105 440L Interlock

    Allen-Bradley

    Allen-Bradley 440L-AF6105 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6105Product Overview Allen-Bradley 440L-AF6105 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $42.00
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  • Allen-Bradley 440L-AF6104 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6104 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6104Product Overview Allen-Bradley 440L-AF6104 is a refurbished 440L 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 440LAF6103 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LAF6103 440L Interlock (Refurbished)

    About Allen-Bradley 440LAF6103Product Overview Allen-Bradley 440LAF6103 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $429.00
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  • Allen-Bradley 440L-AF6102 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6102 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6102Product Overview Allen-Bradley 440L-AF6102 is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $63.00
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