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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 440L-P4H3400MN 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-P4H3400MN 440L Interlock (Refurbished)

    About Allen-Bradley 440L-P4H3400MNProduct Overview Allen-Bradley 440L-P4H3400MN is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by...

    $5,265.00
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  • Allen-Bradley 440L-P4H3400M 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-P4H3400M 440L Interlock (Refurbished)

    About Allen-Bradley 440L-P4H3400MProduct Overview Allen-Bradley 440L-P4H3400M is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $4,803.50
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  • Allen-Bradley 440LP4H3220N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4H3220N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4H3220NProduct Overview Allen-Bradley 440LP4H3220N is a refurbished 440L 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 440LP4H3220MN 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4H3220MN 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4H3220MNProduct Overview Allen-Bradley 440LP4H3220MN is a refurbished 440L 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 440LP4H2500N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4H2500N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4H2500NProduct Overview Allen-Bradley 440LP4H2500N is a refurbished 440L 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 440LP4H2500MN 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4H2500MN 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4H2500MNProduct Overview Allen-Bradley 440LP4H2500MN is a refurbished 440L 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 440LP4G2502N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4G2502N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4G2502NProduct Overview Allen-Bradley 440LP4G2502N is a refurbished 440L 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 440LP4D1800N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4D1800N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4D1800NProduct Overview Allen-Bradley 440LP4D1800N is a refurbished 440L 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 440LP4D1650N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4D1650N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4D1650NProduct Overview Allen-Bradley 440LP4D1650N is a refurbished 440L 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 440LP4D1350N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4D1350N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4D1350NProduct Overview Allen-Bradley 440LP4D1350N is a refurbished 440L 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 440LP4D1200N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440LP4D1200N 440L Interlock (Refurbished)

    About Allen-Bradley 440LP4D1200NProduct Overview Allen-Bradley 440LP4D1200N is a refurbished 440L 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 440L-P4D0600N 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-P4D0600N 440L Interlock (Refurbished)

    About Allen-Bradley 440L-P4D0600NProduct Overview Allen-Bradley 440L-P4D0600N is a refurbished 440L 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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