The inside diameter of the 100A fuse tube increases the internal pressure, giving superior and reliable expulsion action. During frequently encountered intermediate fault ranges, this diameter also permits higher TRV, (Transient Recovery Voltage), values to be tolerated. The liner is constructed of an arc quenching material. The tube is manufactured from fibreglass, which permits a smaller bore and provides a higher burst strength. It is protected from the weather and environment by an ultra violet resistant coating.