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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-A27010 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A27010Product Overview Allen-Bradley 440K-A27010 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...

    $60.00
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  • Allen-Bradley 440K-A21031 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A21031 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A21031Product Overview Allen-Bradley 440K-A21031 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-A21030 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A21030 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A21030Product Overview Allen-Bradley 440K-A21030 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-A21014 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A21014 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A21014Product Overview Allen-Bradley 440K-A21014 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-A21006 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A21006 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A21006Product Overview Allen-Bradley 440K-A21006 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-A17205 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-A17205 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17205Product Overview Allen-Bradley 440K-A17205 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...

    $36.00
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  • Allen-Bradley 440K-A17183 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A17183 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17183Product Overview Allen-Bradley 440K-A17183 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...

    $26.00
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  • Allen-Bradley 440K-A17182 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A17182 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17182Product Overview Allen-Bradley 440K-A17182 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-A17181 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A17181 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17181Product Overview Allen-Bradley 440K-A17181 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...

    $25.00
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  • Allen-Bradley 440K-A17180 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A17180 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17180Product Overview Allen-Bradley 440K-A17180 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-A17117 440K Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440K-A17117 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17117Product Overview Allen-Bradley 440K-A17117 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...

    $63.00
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  • Allen-Bradley 440K-A17116 440K Interlock

    Allen-Bradley

    Allen-Bradley 440K-A17116 440K Interlock (Refurbished)

    About Allen-Bradley 440K-A17116Product Overview Allen-Bradley 440K-A17116 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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