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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 440KH04044 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KH04044 440K Interlock (Refurbished)

    About Allen-Bradley 440KH04044Product Overview Allen-Bradley 440KH04044 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-H04038 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-H04038 440K Interlock (Refurbished)

    About Allen-Bradley 440K-H04038Product Overview Allen-Bradley 440K-H04038 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...

    $1,144.00
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  • Allen-Bradley 440K-H04037 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-H04037 440K Interlock (Refurbished)

    About Allen-Bradley 440K-H04037Product Overview Allen-Bradley 440K-H04037 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...

    $1,144.00
    Ask for Quote
  • Allen-Bradley 440K-H04036 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-H04036 440K Interlock (Refurbished)

    About Allen-Bradley 440K-H04036Product Overview Allen-Bradley 440K-H04036 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
    Ask for Quote
  • Allen-Bradley 440K-H04035 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-H04035 440K Interlock (Refurbished)

    About Allen-Bradley 440K-H04035Product Overview Allen-Bradley 440K-H04035 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
    Ask for Quote
  • Allen-Bradley 440K-E33087 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-E33087 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33087Product Overview Allen-Bradley 440K-E33087 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
    Ask for Quote
  • Allen-Bradley 440K-E33086 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-E33086 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33086Product Overview Allen-Bradley 440K-E33086 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...

    $142.50
    Ask for Quote
  • Allen-Bradley 440K-E33083 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-E33083 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33083Product Overview Allen-Bradley 440K-E33083 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...

    $142.50
    Ask for Quote
  • Allen-Bradley 440K-E33080 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-E33080 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33080Product Overview Allen-Bradley 440K-E33080 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
    Ask for Quote
  • Allen-Bradley 440K-E33079 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-E33079 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33079Product Overview Allen-Bradley 440K-E33079 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
    Ask for Quote
  • Allen-Bradley 440K-E33078 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-E33078 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33078Product Overview Allen-Bradley 440K-E33078 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
    Ask for Quote
  • Allen-Bradley 440K-E33077 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-E33077 440K Interlock (Refurbished)

    About Allen-Bradley 440K-E33077Product Overview Allen-Bradley 440K-E33077 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
    Ask for Quote
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