... 3. patented design 4. lower circuit resistance The embedded poles of the VYG units totally enclose the vacuum interrupter, CT& PT and ... poles, in epoxy resin with unique materal, make features of aging resistance, low/high-temperature resistance. These features protect ... ,2500,3150,40003Rated short circuit breaking currentkA20,25,31.5,404Rated short time withstand currentkA20,25,31.5,405 Rated peak ...