These arresters belong to Series 1 of surge arrester, according to IEC 60099-4 standard. These arresters belong to Series 1 of surge arrester, according to IEC 60099-4 standard.Products with silicon rubber housing, voltage class from 6-36kV, all ratings areavailable 5kA and 10kA. All products with disconnecter and plastic bracket,same types have passed KEMA inspection test.