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Why do surge arrest typically looks like this ?

I found one of the reason is to prevent ingress of water by using slippery rubber material but it does not explain the reason for the shape of the surge arrest.

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It is to increase the length of the surface path from one side to another. The surface is more conductive and has lower spark voltage than the middle of a material (because it can be coated with dust etc). The discs are there to make the surface path longer without increasing the length of the surge arrestor.

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    \$\begingroup\$ Creepage distance is another term for this. Video description. \$\endgroup\$ – Nick Alexeev Jul 13 '15 at 0:36
  • \$\begingroup\$ Hi, @Pentium100, I understand ! The design is such that to prevent the high voltage current from running across the surface of the surge arrest instead. Thanks for the explanation and the video ! \$\endgroup\$ – SDog Jul 13 '15 at 15:23

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