Fuse: Fuse (fuse) is also known as current fuse, IEC127 standard defines it as "fuse (fuse-link)". Its main role is to play overload protection.
When current flows through a conductor, the conductor will heat up because of its resistance. And the amount of heat follows the formula: Q = 0.24I2RT; where Q is the amount of heat, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, T is the current flow through the conductor time; according to this formula, we are not difficult to see the simple principle of the work of the fuse. When the material used to make a fuse and its shape are determined, its resistance R is relatively certain (if its resistance temperature coefficient is not taken into account). When current flows through it, it generates heat, which increases with time. The current and the size of the resistance to determine the rate of heat generation, the construction of the fuse and its installation to determine the rate of heat dissipation, if the rate of heat generation is less than the rate of heat dissipation, the fuse is not blown.