... surge protection device 1. Description: surLYDT series coaxial signal surge protection device(SPD, surge arrester), is suitable for the computer network system ... shocked by thunder and surge, this product have lots of coaxial interface, such as BNC, N, TNC, L9, CC4 and F110 ... , punctual delivery time.6. Best service after sale are provided. coaxial signal DC type surge protection device