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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-AGWS0800 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGWS0800 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGWS0800Product Overview Allen-Bradley 440L-AGWS0800 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...

    $157.50
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  • Allen-Bradley 440L-AGWS0640 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGWS0640 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGWS0640Product Overview Allen-Bradley 440L-AGWS0640 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 440L-AGWS0480 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGWS0480 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGWS0480Product Overview Allen-Bradley 440L-AGWS0480 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 440L-AGWS0320 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGWS0320 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGWS0320Product Overview Allen-Bradley 440L-AGWS0320 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 440L-AGWS0160 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGWS0160 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGWS0160Product Overview Allen-Bradley 440L-AGWS0160 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...

    $97.50
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  • Allen-Bradley 440L-AGST960 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGST960 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGST960Product Overview Allen-Bradley 440L-AGST960 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...

    $1,300.00
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  • Allen-Bradley 440L-AGST800 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGST800 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGST800Product Overview Allen-Bradley 440L-AGST800 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...

    $1,144.00
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  • Allen-Bradley 440L-AGST640 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGST640 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGST640Product Overview Allen-Bradley 440L-AGST640 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 440L-AGST480 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGST480 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGST480Product Overview Allen-Bradley 440L-AGST480 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...

    $988.00
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  • Allen-Bradley 440L-AGST320 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AGST320 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AGST320Product Overview Allen-Bradley 440L-AGST320 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...

    $1,014.00
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  • Allen-Bradley 440L-AGSCBRKT 440L Interlock (Refurbished)

    Allen-Bradley

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

    About Allen-Bradley 440L-AGSCBRKTProduct Overview Allen-Bradley 440L-AGSCBRKT 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...

    $165.00
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  • Allen-Bradley 440L-AF6130 440L Interlock (Refurbished)

    Allen-Bradley

    Allen-Bradley 440L-AF6130 440L Interlock (Refurbished)

    About Allen-Bradley 440L-AF6130Product Overview Allen-Bradley 440L-AF6130 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...

    $195.00
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