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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 440NG02137X 440N Interlock (Refurbished)

    About Allen-Bradley 440NG02137XProduct Overview Allen-Bradley 440NG02137X 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-G02136 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-G02136 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02136Product Overview Allen-Bradley 440N-G02136 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...

    $403.00
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  • Allen-Bradley 440N-G02123X 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440N-G02123X 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02123XProduct Overview Allen-Bradley 440N-G02123X 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-G02123 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02123 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02123Product Overview Allen-Bradley 440N-G02123 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...

    $442.00
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  • Allen-Bradley 440N-G02118 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02118 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02118Product Overview Allen-Bradley 440N-G02118 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-G02117 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02117 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02117Product Overview Allen-Bradley 440N-G02117 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...

    $455.00
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  • Allen-Bradley 440NG02113X 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440NG02113X 440N Interlock (Refurbished)

    About Allen-Bradley 440NG02113XProduct Overview Allen-Bradley 440NG02113X 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-G02113 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02113 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02113Product Overview Allen-Bradley 440N-G02113 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 440NG02112X 440N Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440NG02112X 440N Interlock (Refurbished)

    About Allen-Bradley 440NG02112XProduct Overview Allen-Bradley 440NG02112X 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-G02112 440N Interlock
    In Stock

    Allen-Bradley

    Allen-Bradley 440N-G02112 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02112Product Overview Allen-Bradley 440N-G02112 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...

    $503.20
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  • Allen-Bradley 440N-G02109 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02109 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02109Product Overview Allen-Bradley 440N-G02109 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...

    $676.00
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  • Allen-Bradley 440N-G02108 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-G02108 440N Interlock (Refurbished)

    About Allen-Bradley 440N-G02108Product Overview Allen-Bradley 440N-G02108 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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