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Gapless zinc oxide surge arresters whose rated voltage 10 - 500 kV are protective equipment used for protecting AC transmission and transformation equipment against damage from atmospheric over-voltage and switching over-voltage.

According to material of external housing, surge arresters can be divided into porcelain housing type (35kV-500kV) and polymeric housing type (10-220kV) .

Surge arresters can be used in following service conditions:

-Ambient temperature -50℃ to +50℃;

-Altitude above sea level up to 3000 m;

- 9 earthquake intensity

The surge arresters have passed all type test specified in IEC60099-4 at KEMA high power Lab.

The surge arresters can be manufactured and tested according to latest version IEC 60099-4 part 4 "Gapless metal oxide surge arrester for A.C. system".