During the use of the fuse holder, when the current flows through the conductor, there will be a certain resistance between the conductors, so the conductor will heat up, and the heat generation of the fuse holder will follow the formula of Q=0.24I2RT to a certain extent. where T is the time the current flows through the conductor, R is the resistance of the conductor, 0.24 is a constant and Q is the amount of heat generated, etc.
When the fuse of the fuse holder is energized, the temperature of the melt will rise due to the heat exchanged by the current. In the process of loading the normal operating current or the permitted overload current, the heat generated by the current will pass through the melt and the shell. The heat emitted by the radiation from the body and the surrounding environment can gradually reach equilibrium.
If the heat dissipation rate of the fuse holder cannot keep up with the heat generation rate, the heat will gradually accumulate on the melt, causing the melt temperature to rise. Once the temperature reaches and exceeds the melting point of the melt material, it will liquefy or vaporize, and then break The open current plays a role in the safety maintenance of the circuit and the person.
The electrical function of the fuse holder is that its fuse is connected in series in the electronic circuit during use. Generally, its resistance is required to be small. When the circuit is in normal operation, it is only equivalent to a wire, which can be stably conducted for a long time. The circuit, when the current fluctuates due to the power supply or external disturbance, should also be able to withstand a certain amount of overload.
In the fuse holder, when there is a relatively large overload current in the circuit, the fuse will act at this time to maintain the safety of the circuit by disconnecting the current. Therefore, there will be two very important working parameters in its operation, namely rated voltage and rated current. During the use of the fuse holder, it is necessary to effectively select the corresponding fuse holder according to the current and voltage of its circuit.