Types of Surge Protectors

AG Surge Arrester types are one of the most important elements for protection against lightning and overvoltage. However, the correct surge arrester class must be selected and applied in a facility. Basically, AG surge arresters are divided into 3 types: Class B, Class C, and Class D. Additionally, combined surge arrester systems such as B+C and B+C+D are also used.

Class B Surge Arrester (Type 1)

Class B surge arresters provide protection according to the 10/350 μs curve, i.e., protection against lightning strikes. They are also called Type 1 or Class 1. Use of Class B surge arresters is mandatory in facilities with external lightning protection.

Class C Surge Arrester (Type 2)

Class C surge arresters provide protection according to the 8/20 μs curve, i.e., protection against internal overvoltages. They are called Type 2 or Class 2 surge arresters. 65% of overvoltage-related damages are caused by internal overvoltages. Therefore, Class C surge arresters should be used in coordination with Class B surge arresters in every facility.

Class D Surge Arrester (Type 3)

Class D surge arresters are used for the protection of sensitive devices. With the increasing number of electronic devices, the Up protection level has decreased. To reduce this Up level to the desired value, Class D surge arresters are used.

How Are Surge Arresters Used in a Facility? You can watch it in our video.

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