... insulator, post insulator, insulator for locomotive 27.5kV New generation of insulator for electrified railway locomotive insulator, post insulator, insulator for locomotive 27.5kV, railway insulator, silicone insulator, post insulator New generation of insulator ... withstand voltage: 180kVPower frequency withstand voltage: 80kV locomotive insulator, post insulator, insulator for locomotive 27.5kV