... for hollow insulators, surge arresters, HV swithes, current transformers and power transformers Features: Fiberglass Winding Tube ... Labs3.Application: Power Transformer,Current Transformer,Hollow Insulators, Bushing, Surge Arrester, High-voltage Current Limiting Fuse, On-load tap changer ... 320MPa4 Insulation Resistance ≥5*104 Ω.M5Surface Flashover Voltage ≥12kV 5. Customers ABB,LAPP,MACLEAN,SIEMENS, ...