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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.

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    Allen-Bradley

    Allen-Bradley 440K-ALK03 440K Interlock (Refurbished)

    About Allen-Bradley 440K-ALK03Product Overview Allen-Bradley 440K-ALK03 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...

    $97.50
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  • Allen-Bradley 440K-ALK01 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-ALK01 440K Interlock (Refurbished)

    About Allen-Bradley 440K-ALK01Product Overview Allen-Bradley 440K-ALK01 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...

    $97.50
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  • Allen-Bradley 440K-A91027 440K Interlock (Refurbished)

    Allen-Bradley

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    About Allen-Bradley 440K-A91027Product Overview Allen-Bradley 440K-A91027 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...

    $54.00
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  • Allen-Bradley 440KA91014 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA91014 440K Interlock (Refurbished)

    About Allen-Bradley 440KA91014Product Overview Allen-Bradley 440KA91014 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 440KA91013 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA91013 440K Interlock (Refurbished)

    About Allen-Bradley 440KA91013Product Overview Allen-Bradley 440KA91013 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...

    $546.00
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  • Allen-Bradley 440KA91012 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA91012 440K Interlock (Refurbished)

    About Allen-Bradley 440KA91012Product Overview Allen-Bradley 440KA91012 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 440KA91011 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA91011 440K Interlock (Refurbished)

    About Allen-Bradley 440KA91011Product Overview Allen-Bradley 440KA91011 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 440KA91010 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA91010 440K Interlock (Refurbished)

    About Allen-Bradley 440KA91010Product Overview Allen-Bradley 440KA91010 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 440KA55137 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KA55137 440K Interlock (Refurbished)

    About Allen-Bradley 440KA55137Product Overview Allen-Bradley 440KA55137 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...

    $135.00
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  • Allen-Bradley 440K-A33624 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A33624 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A33624Product Overview Allen-Bradley 440K-A33624 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...

    $42.00
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  • Allen-Bradley 440K-A33084 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-A33084 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A33084Product Overview Allen-Bradley 440K-A33084 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...

    $23.50
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  • Allen-Bradley 440K-A33082 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-A33082 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A33082Product Overview Allen-Bradley 440K-A33082 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...

    $32.00
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