SpecificationUnitHDDS-1HDDS-2HDDS-3HDDS-4Voltage ClassKV15252835ANSI Class-DS15DS25DS28DS35Specification Mechanical Load (SML) KN70707070Section Lengthmm330440480530Dry Arcing Distancemm203300340404Leakage Distancemm430680792990Low Frequency Dry FlashoverKV110130150200Low Frequency Wet FlashoverKV75110130160Critical impulse Flashover (Pos) KV140200260325