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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 440K-T91029 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T91029 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T91029Product Overview Allen-Bradley 440K-T91029 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...

    $202.50
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  • Allen-Bradley 440KT91028 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91028 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91028Product Overview Allen-Bradley 440KT91028 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...

    $90.00
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  • Allen-Bradley 440K-T91019 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-T91019 440K Interlock (Refurbished)

    About Allen-Bradley 440K-T91019Product Overview Allen-Bradley 440K-T91019 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...

    $157.50
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  • Allen-Bradley 440KT91009 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91009 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91009Product Overview Allen-Bradley 440KT91009 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...

    $6,630.00
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  • Allen-Bradley 440KT91008 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91008 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91008Product Overview Allen-Bradley 440KT91008 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...

    $4,160.00
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  • Allen-Bradley 440KT91007 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91007 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91007Product Overview Allen-Bradley 440KT91007 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...

    $4,680.00
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  • Allen-Bradley 440KT91006 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91006 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91006Product Overview Allen-Bradley 440KT91006 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...

    $4,680.00
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  • Allen-Bradley 440KT91005 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91005 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91005Product Overview Allen-Bradley 440KT91005 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...

    $3,055.00
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  • Allen-Bradley 440KT91004 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91004 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91004Product Overview Allen-Bradley 440KT91004 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...

    $3,055.00
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  • Allen-Bradley 440KT91003 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91003 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91003Product Overview Allen-Bradley 440KT91003 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...

    $1,625.00
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  • Allen-Bradley 440KT91002 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91002 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91002Product Overview Allen-Bradley 440KT91002 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...

    $1,625.00
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  • Allen-Bradley 440KT91001 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440KT91001 440K Interlock (Refurbished)

    About Allen-Bradley 440KT91001Product Overview Allen-Bradley 440KT91001 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...

    $90.00
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