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Main neutral link on Square D main switch burning out.

hertzal123
Noticed the plug in type KQ 120A N link beside the main incomer showing signs of burning.This 3 ph board feeds about

10 air con units which presumably have inverters on the compressors.Wondered if the neutral currents may not cancel out

in this situation and be excessive.The supply cable is 35mm.Thanks for any opinions.

                                                          Regards,Hz
  • 0
    Could be triplen harmonics with neutral currents adding up. Time to break out the True RMS clamp meter and take some measurements.
  • 0
    Or could just be just a loose connection or poor contact (say the link wrongly assembled with a washer in the wrong place or some such).

      - Andy.
  • 0
    Thanks for the replies.

    Regards,hz.

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