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