Insulation coordination is a crucial issue concerning the safety of electrical equipment products, which has always been a matter of great importance from all aspects. Insulation coordination was early applied in high-voltage electrical products. In 1987, Technical Committee 17D of the International Electrotechnical Commission (IEC) drafted a technical document titled "Supplement 1 to IEC 439: Requirements for Insulation Coordination," formally introducing the issue of insulation coordination into low-voltage switchgear and controlgear. Given the current situation in our country, the insulation coordination of equipment remains a significant issue in both high and low-voltage electrical products. Statistics show that 50% to 60% of accidents in our electrical products are caused by the insulation system. Moreover, the formal introduction of the concept of insulation coordination in low-voltage switchgear and controlgear is only a recent development within the past two years. Therefore, properly addressing and resolving the insulation coordination issues in products is a matter of considerable importance.