The product can carry out surge protection respectively of the power supply and video lines of a camera, the enclosure adopts an integral aluminum alloy structure, the product has a small volume and very low output residual voltage, has little insertion loss because the interelectrode capacitance of devices and the attenuation of distributed capacitance to the data signal transmission are fully considered in design, has data transmission rate up to 1000Mbit/s,which can  fully meet the requirements of video signal transmission, and has the advantage of rapid response to transient over-voltage.