We all know that when the current flows through the conductor, the conductor will heat up due to a certain resistance of the conductor. And the heat is followed by this formula: Q = 0.24i2RT; where Q is the heat, 0.24 is a constant, i is the current that flows through the conductor, R is the resistance of the conductor, T is the time of the current flowing the conductor; according to this formula, the formula is It is not difficult to see the simple working principle of the fuse. When the material and shape of the fuse are determined, the resistance R is relatively certain (if it does not consider its resistance temperature coefficient).
When the current flows through it, it will heat up, and its heat capacity is increasing over time. The size of the current and resistance determines the speed of generating heat. The constructor of the fuse and the condition of the installation determine the speed of heat dissipation. If the speed of the heat is less than the speed of heat dissipation, the fuse will not melt. If the speed of the heat is equal to the speed of heat dissipation, it will not melt it for a long time. If the speed of heat generated is greater than the speed of heat dissipation, the heat generated will be more and more. And because it has a certain amount of heat and quality, the increase in heat is expressed in the rise of temperature.
When the temperature rises to the fuse above the melting point of the fuse, the fuse will melt. This is the working principle of the fuse. We should know from this principle that you must carefully study the physical characteristics of your selected materials when designing a manufacturer and ensure that they have consistent geometric size. Because these factors have played an important role in whether the fuse can work normally. Similarly, you must install it correctly when you use it.