... Spool Porcelain Insulator 53-2 1. Details about the Porcelain Spool Insulators 2. Design Drawing Spool Porcelain Insulator Ceramics 53-1, 53-2,53-3,53-4, 53-5 Cat.NO.Fig.Main Dimension(mm)TransverseStrengthNPower frequency voltage ... than $ 2.5 million US dollars.5). A wide range of low and high voltage insulators: Disc Suspension Insulators, Shackle Insulators, Spool Insualtors, Stay ...