Media reports

Some questions about air switches and surge protectors

2019/08/01

We often encounter air switches and surge protectors in the project. Many customers can't figure out the relationship between the two, which leads to the lightning protection system of the project is not done well. Next, we will sort out the air switch and the waves. Several problems with surge protectors.

空气开关与浪涌保护器接线

1. Is the air switch and the surge protector the same thing, does it work the same?

First of all, we need to make clear that the air switch is not the same thing as the surge protector, and the principle of action is different.

The air switch is connected to or disconnected from the circuit and carries the rated operating current, and is reliably protected against overload, short circuit, under voltage, etc. of the line or equipment. As the name suggests, it is a switch that automatically disconnects as long as the current in the circuit exceeds the rated current. It is a very important electrical appliance in low-voltage distribution networks and electric drive systems.

The surge protector means that when a sudden surge voltage or a lightning strike voltage is suddenly generated in the electrical circuit or the communication line power supply due to external interference, the surge protector can conduct the shunt in a very short time, thereby avoiding the overvoltage in the loop. Damage to the equipment. Its main role is to protect electronic equipment from "surge" damage.

M120B3+N

Second, need to connect the air switch in front of the surge protector?


It must be required. In fact, many electrical designers install air-conditioning or fuses in front of the surge protector when designing the power distribution system diagram. The main reason is that the surge protector may be affected by the lightning surge. The ground is short-circuited. When short-circuited to the ground, the air or the fuse can separate the line from the ground to protect the power supply line. In summary, the purpose is to disconnect the surge protector from the system in the event of a failure of the surge protector to avoid accidents such as fire.

Shenzhen Tiandun's surge protector comes with automatic tripping function, plus the protection of the open, it is equivalent to double insurance. The surge protector's own tripping function is also our patented technology.

40KA浪涌保护器

3. How much air switch does the 40KA surge protector choose?

In fact, there is not much relationship between the large switch and the large surge protector. The surge protector front air switch is equipped with a total switch, and the ratio of the total switch to the surge protector front end switch capacity is 1.16:1. Generally 40KA surge protector with 32A open. A D-type air switch is recommended.

The choice of general surge protector depends on the location, such as the total power distribution is a Class I surge, the distribution power and floor distribution are Class II surges, and the terminal equipment is a Class III surge.


If you have any questions about the selection of the surge protector and the wiring of the surge protector, you can call technical advice. Free hotline: 0755-86215101. Shenzhen Tiandun has only done lightning protection for 13 years, producing direct power surge protectors, signal surge protectors, new energy photovoltaic surge protectors, antenna surge protectors, intelligent surge protectors, etc. High-tech products also help provide lightning protection solutions, with hundreds of thousands of customers. Do lightning protection, Tiandun is absolutely serious!


My status