LY21-RJ45 series signal surge protectorarespeciallyused for various computer network such as ethernet network(LAN),token-ring network, and its stisfied different types lightning-proof areas.Theconnector of its input and output is RJ45 male/female connector,which is easilyconnected and installed and it is main used in server equipment, workingstation(intrance) and router,HUB, and board band RJ45 interface protection forprotecting equipment, which will be damaged by the over voltage of the earth orthe line inductance.