What is the 10A miniature fuse in the Premium-Line surge protective devices for? March 05, 2024 09:42 Updated It protects the built-in HF filter from overloading. A defective fuse can be replaced. Related articles How does a surge protection device work? Is a surge protection device still functional after an overvoltage? What is the function of the small red button on brennenstuhl® power strips? What does 13,500A / 19,500A / 60,000A etc. mean for surge protection devices? How do overvoltages occur?