The emergence and development of electricity has promoted the changes of social production and people's lives, but it brings convenience to people, but it also has certain potential safety hazards. Therefore, we should not only pay attention to safety when using electricity, but also use some electrical appliances to reduce or prevent unnecessary dangers. The use of leakage switch to people's life electricity has formed a very good layer of security, but what are the selection rules of leakage protection switch? Let's learn about it together!

Leakage protection switches and their classification

Like other circuit breakers, the leakage protection switch not only can turn on or off the main circuit, but also has the function of detecting and judging leakage current. When the insulator in the main circuit is damaged or leakage occurs, it can disconnect or connect the main circuit according to its own judgment standard. At present, this form of leakage protection device is the most widely used, and can be divided into the following categories according to the different functions of leakage protection switches in the market.

It only has leakage protection function, and must cooperate with protection elements such as fuse, overcurrent relay and thermal relay when using. At the same time, it has overload protection function. At the same time, it has short circuit protection and overload functions. At the same time, it has short circuit protection function. At the same time, it has the functions of overload, leakage, overvoltage and undervoltage.

Selection rules of leakage protection switch

1. When purchasing leakage protectors, manufacturers with production qualifications should be selected, and products with qualified quality inspection should be selected.

2. Determine the working current, leakage current and action time of the protector according to the specific protection scope and the environmental requirements of equipment safety.

3. If graded protection is adopted, the selectivity of upper and lower switch actions should be met. Generally, the rated current of upper level should not be less than the rated leakage current of next level, so as to achieve the effect of sensitive protection of equipment safety.

4. Hand-held electric tools, mobile household appliances and other equipment with high electric shock risk must be equipped with leakage protectors.

5. Leakage protectors must be installed in construction sites and temporary line equipment.

6. Leakage protectors must be installed in socket circuits in enterprises, schools and residential buildings and socket circuits in public places.

7. Leakage protectors must be used when installed in water or in wet, high temperature and metal situations.

This paper summarizes some important knowledge in the selection rules of leakage protection switches and the simple classification of leakage protectors. After reading it, everyone will learn more about it. This kind of safety equipment is indispensable in all kinds of production and life at present, and can effectively play a role in preventing dangers.