Insulators are categorized by installation method into suspension insulators and pole insulators; by the type of insulating material used, they are divided into porcelain insulators, glass insulators, and composite insulators (also known as synthetic insulators); by voltage grade, they are classified into low-voltage and high-voltage insulators; by environmental conditions, there are dirt-resistant insulators for polluted areas; by voltage type, there are DC insulators; and there are also insulators for special purposes, such as insulating crossarms, semiconductor glaze insulators, tension insulators for distribution, spool insulators, and wiring insulators, among others. Additionally, they can be divided into two types based on the possibility of insulation breakdown: Type A, non-breakdown, and Type B, breakdown-prone.