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The main difference between Type A leakage protector and AC type leakage protector is: AC type only protects against AC leakage, it cannot act against DC pulsation leakage, and cannot protect; while Type A protects against AC leakage. Protect the leakage of DC pulse. Therefore, type A is more comprehensive and safer than type AC for leakage protection. The AC type can only detect the leakage of standard sine waves in the power grid, which is suitable for use in areas with better power grid conditions; in regions with poor power grid conditions, the AC power we use tends to be mixed with some clutter in addition to the sine wave. Class A leakage protectors can detect mixed waves, especially when used in places with DC harmonics. AC leakage protection is easy to saturate and has no output performance. Simply put, A-type leakage protection is safer and more effective than AC-type leakage protection, which is the future development direction of leakage protection.