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Surge arresters

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Zinc oxide blocks

Zinc oxide (ZnO) blocks for surge arresters have been developed since 1970’. Since then, over 20 million pieces have been delivered all over the world. Backed up with many years of experience, we offer high-quality high-performance blocks in different sizes for light duty to heavy duty equipment and for AC to DC applications, and different installation environments. Typical zinc oxide blocks are available for surge arresters in distribution class, substation class, DC surge arresters class, GIS type surge arresters and oil-immersed type surge arrestors.

Major Ratings (standard type)
Application for IEC standard Recommended Ur
(kVrms)		 Dimensions(mm)
Diameter Height
5kA Distribution 3.0 32 20
4.5 30
6.0 40
10kA Distribution & Class1 3.0 42 20
4.5 30
6.0 40
10kA Class2 1.5 48 11
3.0 22
6.0 45
10kA Class3 1.5 64 11
3.0 23
6.0 45
20kA Class4 1.5 74 11
3.0 23
6.0 45
20kA Class5 3.0 100 23


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