What is the 10A fine-wire fuse in the Premium-Line surge protectors for? December 05, 2022 12:55 Updated It protects the built-in RF filter from overload. A defective fuse can be easily replaced. Related articles Is a surge protection device still functional after an overvoltage? How are our RJ-45 jacks assigned for surge protection? Why is the internal thermal fuse not exchangeable? How can the brennenstuhl® Premium Web-Line Internet extension lead be updated? Is product 1080990 suitable or not for camping (motor home) use, or under what restrictions is it suitable?