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why we need to connect arrestor in parallel with varistor in some circuit ? and we know both is work to protect against high voltage? like this pic.enter image description here

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  • \$\begingroup\$ Well, what do you think? \$\endgroup\$ – Marcus Müller Oct 24 '17 at 20:48
  • \$\begingroup\$ may be split the power dissipation .cuz the varistor damage under very high voltage!!! \$\endgroup\$ – engineer Oct 24 '17 at 20:53
  • \$\begingroup\$ but i said we can put just arrestor why we connect in parallel with varistor?? \$\endgroup\$ – engineer Oct 24 '17 at 20:54
  • \$\begingroup\$ so, with the varistor not working with high voltage, and the spark gap only working under high voltage – can you see the point? \$\endgroup\$ – Marcus Müller Oct 24 '17 at 21:01
  • \$\begingroup\$ yeah, i see, that's mean arrestor doesn't work during fault if the voltage less than varistor voltage . \$\endgroup\$ – engineer Oct 25 '17 at 19:15

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