Drop-out Fuse‌ A drop-out fuse is a protective device used in high-voltage distribution systems (typically 10 kV–40.5 kV) to isolate faulty circuits or equipment during overloads or short circuits. It consists of a fuse tube, porcelain/composite insulators, upper/lower contacts, and a spring-loaded ejection mechanism‌. When the fuse element melts due to excessive current, the tube disconnects and drops vertically, providing a visible break for safe maintenance‌. Key features include: Arc-extinguishing design‌: Utilizes gas-generating materials to quench arcs during operation‌. Weather resistance‌: Stainless steel or galvanized components ensure durability in outdoor environments‌. Automatic fault indication‌: Mechanical drop action signals fault location without external power‌. Widely applied in overhead lines, transformer protection, and renewable energy grids, it complies with IEC 60282 or GB/T 15166 standards. Modern variants integrate reinforced insulators to prevent pollution-induced flashovers and anti-icing coatings for cold climates‌.