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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-M2NNNDS 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M2NNNDSProduct Overview Allen-Bradley 440K-M2NNNDS 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-M2NAEYS 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M2NAEYS 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M2NAEYSProduct Overview Allen-Bradley 440K-M2NAEYS 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...

    $315.00
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  • Allen-Bradley 440K-M22ASDT 440K Interlock

    Allen-Bradley

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    About Allen-Bradley 440K-M22ASDTProduct Overview Allen-Bradley 440K-M22ASDT 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-M22ASDM 440K Interlock

    Allen-Bradley

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    About Allen-Bradley 440K-M22ASDMProduct Overview Allen-Bradley 440K-M22ASDM 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-M22ANYT 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22ANYT 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22ANYTProduct Overview Allen-Bradley 440K-M22ANYT 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...

    $315.00
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  • Allen-Bradley 440K-M22ANDT 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22ANDT 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22ANDTProduct Overview Allen-Bradley 440K-M22ANDT 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-M22ANDL 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22ANDL 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22ANDLProduct Overview Allen-Bradley 440K-M22ANDL 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...

    $405.00
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  • Allen-Bradley 440K-M22AEYT 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22AEYT 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22AEYTProduct Overview Allen-Bradley 440K-M22AEYT 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-M22AEYL 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22AEYL 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22AEYLProduct Overview Allen-Bradley 440K-M22AEYL 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-M22AEDT 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22AEDT 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22AEDTProduct Overview Allen-Bradley 440K-M22AEDT 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-M22AEDM 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-M22AEDM 440K Interlock (Refurbished)

    About Allen-Bradley 440K-M22AEDMProduct Overview Allen-Bradley 440K-M22AEDM 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...

    $240.00
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