At present, this form of leakage protection device is the most widely used, the leakage protection switch on the market according to the function commonly used in the following categories:

(1) It only has the function of leakage protection and power-off, and must be used with fuse, thermal relay, overcurrent relay and other protection components.

(2) It also has overload protection function.

(3) It has overload and short circuit protection functions at the same time.

(4) At the same time, it has short-circuit protection function.

(5) At the same time, it has the functions of short circuit, overload, leakage, overvoltage and undervoltage.

Leakage protection switch refers to a power switch that can detect and judge leakage current and cut off the loop. Its rated current is generally below 20A, leakage current is 6 ~ 30mA, and its sensitivity is high. It is often used for the protection of hand-held electric tools and mobile electrical equipment, as well as civil places such as homes and schools.