Epoxy-insulated 20-kilovolt high-frequency toroidal transformer wani nau'in mai canzawa ne na musamman wanda ya haɗu da kayan insulating epoxy, matakin ƙarfin ƙarfin kilo 20, halayen aiki mai girma-mita da tsarin toroidal core. Ana amfani da shi sosai a cikin kayan lantarki, sabon makamashi, sadarwa da sauran fannoni.