Leakage protector is used for effective protection of direct and indirect shock of low-voltage power grid, and can also be used as phase loss protection of three-phase motor.It has single phase and three phase.

Working principle:

Because of its leakage current or the resulting neutral point to the earth voltage change as the action signal, so do not need to use the electric current value to set the action value, so high sensitivity, after the action can effectively cut off the power supply, to protect personal safety.

Classification of leakage protectors:

Leakage protection device can be classified according to its protection function, structural characteristics, installation mode, operation mode, pole number and line number, action sensitivity, etc., here mainly according to its protection function and use classification, general can be divided into leakage protection relay, leakage protection switch and leakage protection socket three.

1. Leakage protection relay

It has the function of detecting and judging leakage current, but does not have the power of cutting off and connecting the main circuit.Three - phase automatic recloser leakage protection switch energy leakage protection device.Leakage protection relay is composed of zero sequence transformer, tripping device and auxiliary contact of output signal.It can be combined with the automatic switch of high current, and can be used as the general protection of the low-voltage network or the leakage, grounding or insulation monitoring protection of the trunk line.When there is leakage current in the main circuit, the detach tripper of the auxiliary contact and the main circuit switch is connected in series to form a primary circuit.Therefore, the auxiliary contact is connected to detach the tripping device and disconnect the air switch, ac contactor, etc., so that the switch is off and the main circuit is cut off.Auxiliary contacts can also be connected to acoustic and optical signal devices, send out leakage alarm signal, reflecting the insulation status of the line.

2. Leakage protection switch

It is not only the main circuit can be turned on or off like other circuit breakers, but also has the function of leakage current detection and judgment. When leakage or insulation damage occurs in the main circuit, the leakage protection switch can turn on or off the main circuit according to the judgment result.It can be combined with fuse and thermal relay to form a fully functional low-voltage switch element.

Household leakage protection switch

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

(1) it only has the power off function of leakage protection, and it must cooperate with fuse, thermal relay, overcurrent relay and other protection elements when using.

(2) overload protection function.

(3) overload and short circuit protection functions.

(4) at the same time with short circuit protection function.

(5) at the same time with short circuit, overload, leakage, overvoltage, undervoltage function.

3. Leakage protection socket

It refers to the power socket with the ability to detect and judge the leakage current and cut off the circuit.Its rated current is generally 10A, 16A, leakage action current 6 ~ 30mA, high sensitivity, often used for the protection of hand-held electric tools and mobile electrical equipment and home, school and other civilian places.