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CPU-Guard

  • Surge Protection for your Amplex Modules

    The CPU-Guard module is an overvoltage protection module for the AmsCPU/AmsCPU-IO module.

    It is used where the AmsCPU/AmsCPU-IO standard protection level (EN61000-6-2, industrial immunity) is not sufficient.

    The CPU-Guard is designed specifically for the AmsCPU/AmsCPU-IO, making this module able to withstand surge pulses up to ± 6 kV and burst pulses up to ± 3 kV.

    The module has a built-in thermal protection that protects the internal circuits from over-heating due to severe conditions.

    The CPU-Guard is designed to be installed on a DIN-rail next to the AmsCPU or AmsCPU-IO.


    • ± 6 kV according to EN61000-4-5
    • ± 3 kV according to EN61000-4-4
    • The module is protected against internal faults by thermal fuses that disconnect input from output permanently. Subsequent module
      replacement is required.


    • The CPU-Guard is placed close to the AmsCPU that is to be protected. The AmsCPU is powered by one, two or three phases + neutral through the CPU-Guard.
      Nominal voltage: 230 V AC
      Nominal frequency: 50/60 Hz
      Pin 4 (230 V AC analog input) is an extra phase which the AmsCPU uses for, e.g. cabinet door monitoring.
    • Connect the CPU-Guard outputs to the equivalent AmsCPU main power connection inputs. See the AmsCPU data sheet.

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