At the earliest time, the installation of lightning protection device for analog cameras needed to install a set of power lightning protection device (DC or AC), a set of coaxial video cable lightning protection device and a set of control signal lightning protection device (for example, the camera is controlled by pan/tilt), which was cumbersome to install and occupied a lot of space in the weak box. Therefore, in 2002, Shanghai Lei Xun Lightning Protection Technology Co., Ltd. produced the two-in-one lightning protection device for the first time. Three-in-one arrester (patent number ZL20043008009 1. 1), its principle is to combine power arrester, coaxial cable video arrester and control signal arrester into one, so as to achieve the purpose of reducing cost and facilitating installation.
So at that time, the 2-in-1 lightning arrester was a lightning arrester without the protection of pan/tilt control circuit, which was used for cameras without pan/tilt control, and a 3-in-1 lightning arrester was used for cameras with pan/tilt control circuit protection.
Later, a high-definition network camera appeared, which can not only transmit the control signal of the pan/tilt, but also transmit the video signal through a network cable, so the two-in-one and three-in-one lightning arresters of the high-definition network camera at that time were all made into two-in-one lightning arresters, that is, the two-in-one lightning arresters of the network and the power supply.
Now with the development of society, coaxial cable cameras have been basically eliminated, and all new or modified cameras are basically network cameras, so now when it comes to camera lightning arresters, there are basically only two-in-one lightning arresters.