Fuse, also known as current fuse, is defined by the IEC127 standard as "fuse-link". It is mainly an overload protection. When the fuse is properly installed in the circuit, the fuse will cut off the current and protect the circuit safe operation when the current anomaly rises to a certain height and heat
Invented by Edison fuse is used to protect more than one hundred years ago when the expensive incandescent bulbs, along with the development of The Times, the fuse protection power equipment is not trained in current overheat damage, avoid electronic equipment serious damage caused by internal fault.
Invented by Edison fuse is used to protect more than one hundred years ago when the expensive incandescent bulbs, along with the development of The Times, the fuse protection electronics/electrical equipment not trained in current/overheating and avoid electronic equipment serious damage caused by internal fault.
When the current flows through a conductor, the conductor will heat up because of the resistance of the conductor. And the calorific value follows this equation: Q=0.24 I2RT; Q is heat, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, T is the time when the current flows through the conductor; In accordance with this formula, it is not difficult to see the simple working principle of fuses.
When the material and its shape of the fuses are determined, its resistance R is relatively certain (unless its resistance temperature coefficient is considered). As the current flows through it, it heats up, increasing its heat as time increases. Current and resistance of size to determine the speed of heat, the structure of the fuse and its installation conditions to determine the speed of heat dissipation, if the speed is less than the speed of heat dissipation of heat, the fuse is not fuse. If the rate of heat produced is equal to the rate of heat dissipation, it will not be fused for a considerable amount of time. If the rate of heat is greater than the rate of heat dissipation, then more and more heat will be generated. Because it has certain specific heat and quality, its heat increase is reflected in the temperature rise, when the temperature rises to the fuse of the fuse, the fuse is blown out. That's how fuses work. We should know from this principle that you must carefully study the physical properties of your selected materials when designing the fuse, and ensure that they have a uniform geometric dimension. Because these factors are important for the safety of the fuse. Again, you must install it properly when you use it
The basic composition of
General fuse consists of three parts: one is melt part, it is the core of the fuse, fuse when have the effect of cut off the current, the same class, the same specification fuse melts, material to be same, geometry size, small resistance, as far as possible, and be consistent, the most important thing is fusing features should agree, commonly used household fuse lead antimony alloy; The second is the electrode part, which usually has two. It is an important part of the connection of the melt and the circuit. It must have good conductivity, and it should not have obvious installation contact resistance. Part three is stents, the fuse melts is generally fine soft, the role of stents is to melt and make three parts fixed rigid overall ease of installation, use, it must have good mechanical strength, insulation, heat resistance and flame retardant, in use should not produce the phenomenon such as fracture, deformation, combustion and short circuit.