How a heating element fuse works

When current flows through a conductor, the conductor will heat up due to the presence of a certain resistance in the conductor. And the calorific value follows this formula: Q=I2RT; where Q is the calorific value, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time for the current to flow through the conductor; according to this formula we It is not difficult to see the simple working principle of the fuse. When the material and shape of the fuse are determined, its resistance R is relatively determined (if its temperature coefficient of resistance is not considered). It heats up when current flows through it, and it heats up over time. The size of the current and resistance determines the rate of heat generation. The structure of the fuse and its installation condition determine the rate of heat dissipation. If the rate of heat generation is less than the rate of heat dissipation, the fuse will not blow. If the rate at which heat is generated is equal to the rate at which heat is dissipated, it will not fuse for a considerable period of time. When heat is generated faster than it is dissipated, more and more heat is generated. And because it has a certain specific heat and mass, the increase in its heat is reflected in the increase in temperature. When the temperature rises above the melting point of the fuse, the fuse will fuse. This is how fuses work. We should know from this principle that you must carefully study the physical properties of the materials you choose when designing and manufacturing fuses, and ensure that they have consistent geometric dimensions. Because these factors play a crucial role in whether the fuse can work properly.