O lenei transformer o le epoxy resin cased ma atoatoa-faapipii fausaga ma insulation atoatoa.It ua mamanuina mo le faaaogaina o le fuaina o le voltage, malosi faaeletonika ma relay le puipuiga i le faiga o le malosiaga ma fua faatatau masani 50Hz - 60Hz ma fuaina voltage 3,6, 10 kV po o lalo. Laititi laʻititi, mama mama e mafai ona faʻapipiʻi i soʻo se tulaga.