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Is it really necessary to install surge protective devices at home? I believe many people will have such questions. Facts have proved that lightning accidents are common in families nowadays, so it is urgent to install surge protective devices. At present, a large number of low-quality surge protective devices are pouring into the market, many users do not know how to choose and distinguish, which has become a difficult problem for most family users to solve, so how to choose a suitable surge protective device?

1、 Grading protection of surge protective device

Surge protective device (SPD) is divided into three levels according to the area to be protected. The first level SPD can be applied to the general distribution cabinet in the building, which can discharge the direct lightning current. The maximum discharge current is 80kA ~ 200kA; The second level surge protective device (SPD) is used in the shunt distribution cabinet of the building, which is aimed at the voltage of the former level arrester and the lightning induced protection equipment in the area. The maximum discharge current is about 40ka; The third level surge protective device (SPD) is applied to the front end of important equipment, which is the ultimate means to protect the equipment. It protects the LEMP and the residual lightning energy passing through the second level anti lightning device, and the maximum discharge current is about 20KA.

2、 Look at the price

Don't be greedy to buy Household surge protective devices. If the price of surge protective devices is less than 50 yuan on the market, it's better not to use them. The capacity of these devices is quite limited, and they are not effective for large surges or spikes. It is easy to overheat, and then cause the whole surge protective device to catch fire.

3、 See if there are safety signs

If you want to know the quality of the product, it also depends on whether it has the lightning protection center test report or product safety certificate. If the protector does not have the safety test mark, it is likely to be a poor quality product, and the safety cannot be guaranteed. Even if the price is high, it doesn't mean the quality is good.

4、 Energy absorption capacity

The higher the energy absorption capacity, the better the protection performance. The value of the protector you buy should be at least 200 to 400 joules. In order to obtain better protection performance, the protector with the value above 600 joules is the best.

5、 Look at the response speed

Surge protectors do not disconnect immediately, they respond to a surge with a slight delay. The longer the response time is, the longer the computer (or other equipment) will suffer from the surge. Therefore, it is necessary to purchase surge protective devices with response time less than one nanosecond.

6、 Look at the clamping voltage

The lower the clamping voltage is, the better the protection performance is. It has three protection levels: 300 V, 400 V and 500 v. generally, the clamping voltage is very high when it exceeds 400 V. Therefore, the clamping voltage value should be observed to ensure the safety.

In general, in the process of choosing surge protective devices, families should recognize the brand and know more about its performance in all aspects. Leihao electric focuses on lightning protection. Its products have passed the safety test of lightning protection center, and the production process is checked at all levels, so as to keep your family away from the invasion of lightning and ensure the safety of family electronic equipment and personal safety.