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Safety Enclosures and Interlocks

Shenzhen, China
Published: Jul 3, 2026
Safety Enclosures and Interlocks

The most effective safety control is keeping the beam enclosed so it can never reach an operator.

Enclosure Types

  • Fully enclosed Class 1 cabinet — The laser operates inside a sealed enclosure with interlocked doors. When the door opens, the laser stops instantly. This converts your Class 4 system into a Class 1 product under IEC 60825-1.
  • Light curtain / safety curtain — An invisible safety barrier that stops the laser when interrupted. Suitable for production line integration where parts must be loaded continuously.
  • Open system with designated NHZ — The laser operates on an open table with a marked Nominal Hazard Zone. Only trained personnel wearing PPE may enter this zone. Least safe option.
  • Interlock Requirements

    Per IEC 60825-1 and ANSI Z136.1, interlocks must:

    • Automatically shut off the laser when the enclosure is opened
    • Prevent laser activation while the enclosure is open
    • Require manual reset after an interlock trip (no automatic restart)
    • Fail-safe design — If the interlock system fails, the laser must default to off

    If your machine lacks interlocks, add them. Retrofit kits are available for most systems and cost $200–$600 — a trivial expense compared to an injury claim.

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