... surge arresters ,drop-out fuse ,composite insulator,disconnector switch ect. Specifications:We can design.process and manufacture this series of productions ... 42L1)The arrester’s rated voltage (virtual value):21kV,24kV, 27kV,30kV ,33kV,36kV,42kV,2)The constant operation ... 30L1) The arrester’s rated voltage (virtual value):21kV,24kV,27kV,30kV2) The constant operation voltage (virtual value): 17 ...