Buildings

SPD is designed to limit transient overvoltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this overvoltage to a value that is not hazardous for the electrical installation and electric switchgear and controlgear.

SPD eliminates overvoltages

  • in common mode, between phase and neutral or earth;
  • in differential mode, between phase and neutral.

In the event of an overvoltage exceeding the operating threshold, the SPD

  • conducts the energy to earth, in common mode;
  • distributes the energy to the other live conductors, in differential mode.
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