What is the Significance of the Rated Voltage of a Fuse
Due to the small resistance value of the fuse itself, and we hope that the smaller the better, the voltage drop at both ends of the fuse is very small, much smaller than the rated voltage of the fuse. Therefore, when the fuse operates normally, the rated voltage has little practical significance. The true significance of the rated voltage of a fuse lies in its safety performance.
As a safety component, a fuse must be ensured to be safe during normal operation, during protective actions, and at any time after the melt melts. During and after the melt melts, the rated voltage of the fuse is of great significance. The unsafe factor when a fuse blows comes from the energy released by overcurrent, and the magnitude of this 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 less than the circuit voltage, it may cause unsafe phenomena.
Therefore, it is necessary to use a fuse with a rated voltage greater than or equal to the maximum voltage of the circuit. Similarly, after a fuse blows, 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, which is the maximum voltage it can withstand. Only when the rated voltage of the fuse is greater than or equal to the circuit voltage can it be guaranteed not to be broken down, not to continue to arc or conduct again. So when choosing a fuse, we must ensure that the rated voltage of the fuse is greater than or equal to the maximum voltage of the protected circuit, in order to ensure sufficient safety performance of the fuse.
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