A fuse is a critical safety device and overcurrent protection component in electrical and electronic circuits, designed to safeguard components, equipment, and operators while preventing damage from excessive current. It consists of a thin metal wire, strip, or internal fusible element that melts and breaks the circuit when the current exceeds its rated value—effectively stopping the flow of electricity and halting the spread of faults. This action prevents overheating, fires, or damage to appliances, wiring, or other electrical equipment caused by short circuits, overloads, or system faults. Widely used in various electronic devices and circuit systems, fuses deliver precise operating characteristics and reliable breaking capacity, serving as a key device to ensure stable circuit operation. They comply with international safety standards such as IEC and UL, providing comprehensive protection across diverse applications.