What is the difference between surge device, arrester, leakage protection, circuit breaker?

- Jul 20, 2020-

Nowadays, every household cannot do without electricity, and the safety of household appliances is becoming more and more important. In order to protect our electricity safety, all kinds of devices that can break the circuit have been produced. Among them are surge devices, lightning arresters, leakage protection, and circuit breakers that everyone knows better. What is the difference between these types of protection devices, today we will understand the difference between surge devices, lightning arresters, leakage protection, and circuit breakers. Hope it can be helpful to everyone.

1) Surge protector


Surge protector (SPD), also known as "lightning protector" and "lightning arrester", is to limit the surge generated by strong transient overvoltage in electrical circuits and communication lines, thereby protecting the equipment. Its working principle is that when there is an instantaneous overvoltage or overcurrent in the line, the surge protector will quickly turn on and discharge the surge in the line into the ground.

2) Lightning arrester


A lightning arrester is an electrical component used to protect various electrical equipment in the power system from damage caused by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage.

3) leakage protection


Leakage current protector is an independent category of electrical appliances. Unlike circuit breakers, it is an obsolete product that is currently recommended to be deactivated. It is different from the leakage circuit breakers often used on distribution boxes. But some of our electricians often confuse the two.

The leakage protector only plays the role of leakage protection, and needs to cooperate with the circuit breaker to realize the comprehensive protection of overload, short circuit and leakage. The leakage circuit breaker itself includes all the above functions.

4) Circuit breaker


The air switch is also called a circuit breaker. When the current in the circuit exceeds the rated current, it will automatically disconnect and protect the circuit or electrical equipment from short-circuit and overload. For example, power sources such as lighting and pump rooms can be controlled by air switches.