We are an electrical appliance manufacturer. We have many products, such as Power Cord With Fuse. Let's analyze the development history and basic functions of fuses.

　　The fuse is also known as a current fuse or a fuse. The IEC127 standard defines it as a "fuse-link", and the key part (fuse) is made of silver-copper alloy with relatively high resistivity and low melting point. completed. When the current abnormally rises to a certain height and a certain heat, the fuse will fuse itself and cut off the current, thereby protecting the safe operation of the circuit.

　　Development History

　　In the 1880s, Edison applied for the first patent for a fuse equivalent to a safety valve in a circuit, which opened the history of the development of fuses. As a result, different varieties (traditional tubular fuses, miniature fuses, chip fuses, automotive fuses, industrial fuses) have been produced with different shapes/dimensions/installation forms/materials/structures/specifications/characteristics/applications.

　　 Differences in industry development and environmental conditions in various countries in the world have produced many differences infuses in different areas of use. These differences reflected in the tubular electronic small fuse products have gradually formed two major systems in North America and Europe. The IEC60127-4 universal modular fuse link attempts to integrate the two systems into one, taking the first step.

　　 China's fuse industry started in the 1950s and began to copy the Soviet Union at that time, with few varieties/old structures/outdated test methods. At the end of the 1970s, the localization of color TVs promoted the development of the small fuse industry, and the time-delay fuses for color TVs began to move closer to international standards.

　　 China's first national standard for small fuses, GB9364.-88, equivalently adopts the corresponding parts of IEC60127. The revised GB9364-97 and GB9364.4 formulated in 2011 are equivalent to using the corresponding parts of IEC60127. Parts 5, 9, and 10 have not yet been formulated.

　　effect

　　The fuse invented by Edison more than 100 years ago was used to protect the expensive incandescent lamps at that time. With the development of the times, the fuse protects the electronic/electrical equipment from overcurrent/overheating damage and avoids the serious injury caused by the internal failure of the electronic equipment.

　　basic skills

　　Electrical performance: The fuse is connected in series in the electronic circuit, and its resistance is generally required to be small (low power consumption). When the circuit is working normally, it is only equivalent to a wire, which can conduct the circuit stably for a long time; When the current fluctuates due to external interference, it should also be able to withstand a certain range of overload; only when a large overload current (fault or short circuit) occurs in the circuit, the fuse will act to protect the safety of the circuit by disconnecting the current.

　　Safety: In the process of fuse breaking the circuit, due to the existence of circuit voltage, arcing will occur in the gap where the fuse is disconnected, and high-quality fuses should avoid this arcing as much as possible; , and should be able to withstand the circuit voltage applied to both ends.