High voltage electrical insulator is usually used on transmission lines, high substations and stations including porcelain insulator, polymer insulator and glass insulator.

Porcelain insulators are made by wet process porcelain consisting of porcelain units and insulator fittings. High voltage electrical insulator includes suspension insulator strings, hollow bushing insulator and station post insulator

Polymer insulator is made by whole injection consisting of FRP core, housing, sheds and insulator fittings. High voltage electrical insulator include suspension insulator, bushing insulator and station post insulator.

Glass insulator consists of glass shed and insulator end fittings. High voltage electrical insulator includes suspension insulator strings.

Some parts of high voltage electrical insulators
Clamps, fittings and accessory hardware used directly with such insulators or insulating parts and/or affecting their functioning, except crossarm pins, bus clamps and pillar insulator spacers.

High voltage electrical insulator commonly includes suspension insulators, hollow core insulator and post insulator used high voltage electrical devices.

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