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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 440N-Z21US2B 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21US2B 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21US2BProduct Overview Allen-Bradley 440N-Z21US2B is a refurbished 440N 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 440N-Z21US2A 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21US2A 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21US2AProduct Overview Allen-Bradley 440N-Z21US2A is a refurbished 440N 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 440N-Z21U26H 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U26H 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U26HProduct Overview Allen-Bradley 440N-Z21U26H is a refurbished 440N 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 440N-Z21U26B 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U26B 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U26BProduct Overview Allen-Bradley 440N-Z21U26B is a refurbished 440N 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 440N-Z21U26A 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U26A 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U26AProduct Overview Allen-Bradley 440N-Z21U26A is a refurbished 440N 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 440N-Z21U17H 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U17H 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U17HProduct Overview Allen-Bradley 440N-Z21U17H is a refurbished 440N 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 440N-Z21U17A 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U17A 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U17AProduct Overview Allen-Bradley 440N-Z21U17A is a refurbished 440N 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 440N-Z21U16H 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U16H 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U16HProduct Overview Allen-Bradley 440N-Z21U16H is a refurbished 440N 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 440N-Z21U16A 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21U16A 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21U16AProduct Overview Allen-Bradley 440N-Z21U16A is a refurbished 440N 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 440N-Z21SS3PH 440N Interlock

    Allen-Bradley

    Allen-Bradley 440N-Z21SS3PH 440N Interlock (Refurbished)

    About Allen-Bradley 440N-Z21SS3PHProduct Overview Allen-Bradley 440N-Z21SS3PH is a refurbished 440N 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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