English name of rated voltage refers to the voltage of electrical equipment when it works normally. The rated voltage is the best voltage for electrical equipment when working for a long time. If it is high, it is easy to burn out, and the abnormal operation is low (abnormal lighting of bulb and abnormal operation of motor). At this time, the components of the electrical equipment are in the best condition, and only when they work in the best condition can the performance of the electrical equipment be relatively stable and the service life of the electrical equipment be prolonged.
Of course, the fusing of the fuse depends on the current and has nothing to do with the working voltage of the circuit. The rated voltage of fuse is put forward from the perspective of safe use of fuse, which is the highest working voltage of the circuit where the fuse is in safe working condition. This indicates that the fuse can only be placed in circuits whose operating voltage is less than or equal to the rated voltage of the fuse. Only in this way can the fuse work safely and effectively, otherwise, the fuse will continue to arc or be broken down by voltage when it blows out, thus endangering the circuit.
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When the fuse material and its shape are determined, its resistance R is relatively determined (if its temperature coefficient of resistance is not considered). When current flows through it, it will generate heat, and its calorific value will increase with time. The current and resistance determine the heating speed, and the structure of fuse and its device determine the heating speed. If the heating speed is lower than the heating speed, the fuse will not blow. If the heating speed is equal to the heat dissipation speed, it will not fuse in a proper long time.
If the rate of heat generation exceeds the rate of heat consumption, the amount of heat generated will increase. In addition, because a certain specific heat and quality are high, the increase of heat is manifested in the temperature rise, and if the temperature rises above the melting point of the fuse, the fuse will blow. This is how fuses work.
From this principle, it is necessary to carefully study the physical properties of the materials you choose and ensure that they have several common dimensions when planning to make fuses. Because these factors play an important role in the normal operation of the fuse. Similarly, when using it, be sure to install it correctly.
