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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-MT55105 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55105Product Overview Allen-Bradley 440K-MT55105 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...

    $390.00
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  • Allen-Bradley 440K-MT55104 440K Interlock

    Allen-Bradley

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    About Allen-Bradley 440K-MT55104Product Overview Allen-Bradley 440K-MT55104 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...

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  • Allen-Bradley 440K-MT55103 440K Interlock
    In Stock

    Allen-Bradley

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    About Allen-Bradley 440K-MT55103Product Overview Allen-Bradley 440K-MT55103 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...

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  • Allen-Bradley 440K-MT55102 440K Interlock (Refurbished)

    Allen-Bradley

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    About Allen-Bradley 440K-MT55102Product Overview Allen-Bradley 440K-MT55102 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...

    $360.00
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  • Allen-Bradley 440K-MT55101 440K Interlock

    Allen-Bradley

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    About Allen-Bradley 440K-MT55101Product Overview Allen-Bradley 440K-MT55101 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...

    $420.00
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  • Allen-Bradley 440K-MT55100 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-MT55100 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55100Product Overview Allen-Bradley 440K-MT55100 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...

    $420.00
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  • Allen-Bradley 440K-MT55099 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-MT55099 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55099Product Overview Allen-Bradley 440K-MT55099 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-MT55098 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-MT55098 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55098Product Overview Allen-Bradley 440K-MT55098 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-MT55097 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-MT55097 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55097Product Overview Allen-Bradley 440K-MT55097 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...

    $420.00
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  • Allen-Bradley 440K-MT55096 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-MT55096 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55096Product Overview Allen-Bradley 440K-MT55096 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-MT55095 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-MT55095 440K Interlock (Refurbished)

    About Allen-Bradley 440K-MT55095Product Overview Allen-Bradley 440K-MT55095 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 440KMT55094 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KMT55094 440K Interlock (Refurbished)

    About Allen-Bradley 440KMT55094Product Overview Allen-Bradley 440KMT55094 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...

    $300.00
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