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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-C21044 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21044 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21044Product Overview Allen-Bradley 440K-C21044 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...

    $262.50
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  • Allen-Bradley 440K-C21043 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21043 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21043Product Overview Allen-Bradley 440K-C21043 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 440KC21042 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KC21042 440K Interlock (Refurbished)

    About Allen-Bradley 440KC21042Product Overview Allen-Bradley 440KC21042 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-C21038 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21038 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21038Product Overview Allen-Bradley 440K-C21038 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...

    $150.00
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  • Allen-Bradley 440K-C21037 440K Interlock (Refurbished)
    In Stock

    Allen-Bradley

    Allen-Bradley 440K-C21037 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21037Product Overview Allen-Bradley 440K-C21037 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...

    $146.16
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  • Allen-Bradley 440K-C21034 440K Interlock (Refurbished)
    In Stock

    Allen-Bradley

    Allen-Bradley 440K-C21034 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21034Product Overview Allen-Bradley 440K-C21034 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...

    $176.04
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  • Allen-Bradley 440K-C21033 440K Interlock (Refurbished)
    In Stock

    Allen-Bradley

    Allen-Bradley 440K-C21033 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21033Product Overview Allen-Bradley 440K-C21033 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...

    $234.00
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  • Allen-Bradley 440K-C21023 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21023 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21023Product Overview Allen-Bradley 440K-C21023 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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  • Allen-Bradley 440K-C21003 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21003 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21003Product Overview Allen-Bradley 440K-C21003 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-C21002 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-C21002 440K Interlock (Refurbished)

    About Allen-Bradley 440K-C21002Product Overview Allen-Bradley 440K-C21002 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-B04049 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-B04049 440K Interlock (Refurbished)

    About Allen-Bradley 440K-B04049Product Overview Allen-Bradley 440K-B04049 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...

    $702.00
    Ask for Quote
  • Allen-Bradley 440K-B04048 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-B04048 440K Interlock (Refurbished)

    About Allen-Bradley 440K-B04048Product Overview Allen-Bradley 440K-B04048 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...

    $585.00
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