Insulators are categorized by installation methods, including suspension insulators and支柱insulators; by the insulation material used, they are divided into porcelain insulators, glass insulators, and composite insulators (also known as synthetic insulators); by voltage grade, they are classified as low-voltage and high-voltage insulators; by environmental conditions, there are insulators for polluted areas; by voltage type, there are DC insulators; and there are various specialized types such as insulating crossarms, semiconductor glaze insulators, tension insulators for distribution, drum insulators, and wiring insulators. Additionally, based on the possibility of insulation breakdown, they can be further categorized into Type A, non-breakdown insulators, and Type B, breakdownable insulators.