Oil-immersed fuse is a device used to protect circuits, mainly to prevent overload and short circuit. When the current exceeds the rated value, the fuse wire in the fuse will melt and cut off the circuit, thereby protecting electrical equipment and circuits from damage. The advantages of oil-immersed fuses include high breaking capacity, strong reliability, suitable for high current and high voltage environments, and strong resistance to environmental pollution. It is commonly used in industrial and power systems to effectively protect equipment and personnel. It should be noted that the installation and maintenance of oil-immersed fuses require strict compliance with standards to ensure their normal operation and safety performance.