When you want to marketing surge protection products, you can marketing it in Internet, or fairs, and depends where you want to marketing. If you are in China, , you need to know the role of the surge protector China, and their functions.for power supply systems, in three phase four wire system, the surge arresters China is connected both between the three phase wire and the earth wire, in normal situation, the impedance of surge protection device is very high and no current follows through it. So they have the remote alarm function. The clear energy such as solar panel are more and more popular in the world, and they are very expensive, which also needs photovoltaic surge protection, so you can choose dc surge protectors according to pv systems voltage, there are dc surge arresters for on grid surge protection and also for off grid surge protection. To focus on new tendency and new application, which become more and more important.