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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 440NA32091 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440NA32091 440N Interlock (Refurbished)

    About Allen-Bradley 440NA32091Product Overview Allen-Bradley 440NA32091 is a refurbished 440N safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $44.00
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  • Allen-Bradley 440N-A32041 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A32041 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A32041Product Overview Allen-Bradley 440N-A32041 is a refurbished 440N 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
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  • Allen-Bradley 440N-A32025 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A32025 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A32025Product Overview Allen-Bradley 440N-A32025 is a refurbished 440N safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $66.00
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  • Allen-Bradley 440N-A32020 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A32020 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A32020Product Overview Allen-Bradley 440N-A32020 is a refurbished 440N 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 440N-A32005 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-A32005 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A32005Product Overview Allen-Bradley 440N-A32005 is a refurbished 440N 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 440N-A32004 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-A32004 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A32004Product Overview Allen-Bradley 440N-A32004 is a refurbished 440N safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $127.50
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  • Allen-Bradley 440N-A17233 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A17233 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A17233Product Overview Allen-Bradley 440N-A17233 is a refurbished 440N 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 440N-A17127 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-A17127 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A17127Product Overview Allen-Bradley 440N-A17127 is a refurbished 440N 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 440N-A17073 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-A17073 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A17073Product Overview Allen-Bradley 440N-A17073 is a refurbished 440N 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 440N-A17054 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-A17054 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A17054Product Overview Allen-Bradley 440N-A17054 is a refurbished 440N 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 440N-A02165 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A02165 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A02165Product Overview Allen-Bradley 440N-A02165 is a refurbished 440N 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 440N-A02128 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-A02128 440N Interlock (Refurbished)

    About Allen-Bradley 440N-A02128Product Overview Allen-Bradley 440N-A02128 is a refurbished 440N 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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