The principle of electric fuse
The power fuse works by simple I2R with time. The greater the current, the shorter the switching time. The power consumption of the fuse is directly proportional to the square of the current passing through the fuse. When the power consumption is too high, the fuse blows. This function also applies to fuse wire harness. If the heat produced exceeds the heat dissipated, the fuse will heat up. When the temperature rises to the fuse's melting point, the fuse will fuse and disconnect the circuit for protection.
Classification of electric fuse:
An electric fuse is part of a fuse. They can be divided into semiconductor protective fuses, dc fuses, special fuses, general fuses and fuses.
Structural features of power fuse:
The structure of the electric fuse is roughly the same as that of the fuse. It consists of three main parts: melt, shell and support. Melt characteristics are determined by the material, size and shape of the melt. Melting materials are divided into low melting point and high melting point. Low melting point materials such as lead and lead alloys tend to melt at low melting points. Because of their high resistivity, the melt has a larger cross-section size and produces more metallic vapor during melting. Materials with high melting points, such as copper and silver, have high melting points and do not melt easily. However, due to its low resistivity, it can be made into a section size smaller than the low melting point. There are two types of melt: filamentous and zonal.
Current fuse parameters