Elements of protection against the arch: Its objective is to keep the electric arc away from the insulators to avoid deterioration. In this group the unloaders are included.
Elements of electric field distribution: Its objective is to evenly distribute the electric field along the string to avoid the appearance of the corona effect. In this group the rings are included.
Elements that combine both functions: Rackets and rings with sacrificial elements.
Pieces made of steel.
They can be manufactured in stainless steel, suitable solution for very corrosive environments