company news about Why the Rated Voltage of the Fuse is higher than or equal to the working voltage？

        Since the resistance value of the fuse itself is very small, and the smaller the better, the voltage drop across the fuse is very small, which is much smaller than the rated voltage of the fuse, so when the fuse works normally, the rated voltage does not matter. practical meaning. The real significance of the rated voltage of the fuse lies in its safety performance.

        As a safety element, the fuse must be guaranteed to be absolutely safe during normal operation, during the protection action, and at any time after the fuse is blown. The rated voltage is of great significance. The unsafe factor when the fuse is blown comes from the energy released by the overcurrent, and the size of the energy depends on the product of current and voltage. The maximum current to ensure the safety of the fuse is the rated breaking capacity, and the maximum voltage is the rated voltage. If the rated voltage of the fuse is lower than the circuit voltage, unsafe phenomena may occur, so a fuse with a rated voltage greater than or equal to the maximum voltage of the circuit must be used.

        Similarly, after the fuse is blown, the circuit voltage is directly applied to both ends of the fuse. At this time, the rated voltage of the fuse is its withstand voltage, that is, the maximum voltage it can withstand. Only when the rated voltage of the fuse is greater than Or equal to the circuit voltage to ensure that it will not be broken down, and will not continue to pull the arc or turn on again. Therefore, when we choose the fuse, we must ensure that the rated voltage of the fuse is higher than or equal to the maximum voltage of the protected circuit, so as to ensure sufficient safety performance of the fuse.