Leakage switch, also known as leakage protector and leakage circuit breaker, is mainly used for electric shock protection when leakage fault occurs in equipment and for people in danger of life. It has overload and short circuit protection function, which can be used to protect overload and short circuit of circuit or motor, and can also be used as non-frequent conversion start of general circuit.

Leakage switch can be classified according to its protection function, structural characteristics, installation mode, operation mode, pole number and line number, action sensitivity, etc. It is mainly introduced according to the protection function and use, and is generally divided into leakage protection relay, leakage protection switch and leakage protection socket.

The 1. leakage protection relay refers to an electric leakage protection device having a function of detecting and judging a leakage current without the function of disconnecting or connecting the main circuit. The leakage protection relay is composed of zero sequence transformer, circuit breaker and output signal auxiliary contact. It can cooperate with high current automatic switch to protect low voltage power grid or main line leakage, grounding or insulation monitoring.

When there is leakage current in the main circuit, the auxiliary contact and the separation type release of the main circuit switch are connected in series to form a loop, and the air switch, AC contactor, etc. are disconnected by the auxiliary contact to turn on the separation type release, so as to cut off the main circuit. The auxiliary contact can also be connected through the sound and light signal device to send out the leakage alarm signal to reflect the insulation condition of the line.

The 2. leakage protection switch refers to not only the same as other circuit breakers, can connect or disconnect the main circuit, but also can detect and judge the leakage current. When the main circuit has leakage or insulation damage, the main circuit can be connected or disconnected according to the judgment result. The product can be combined with fuses and thermal relays to form fully functional low-voltage switching components.

This type of leakage switch is currently widely used, the leakage switch on the market according to the common types of functions have the following categories:

(1) only leakage protection function, use must be with the protection components, such as fuses, thermal relays, over-current relays.

(2) with overload protection function.

(3) At the same time, it has the protection function of overload and short circuit.

(4) protect the short circuit at the same time.

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

The 3. leakage protection socket is a power socket that can detect and judge the leakage current and can cut off the circuit. Its rated current is generally below 20A, leakage current 6 ~ 30mA, high sensitivity, commonly used in hand-held power tools and mobile appliances protection and home, school and other civil places.

The above is for you to introduce the function of the leakage switch and the classification of the leakage switch, I hope to help you!