What Are The Reasons For Insufficient Arc-extinguishing Capability Caused By Excessively High Rated Voltage Of Fuses?
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A drop out fuse fuse generates an electric arc upon melting. A well-designed arc-extinguishing medium (such as silica sand or quartz powder) extinguishes the arc through cooling, molten metal isolation, and limiting the arc path.
When the rated voltage is too high, the fuse structure often features a longer melting gap, a larger arc-extinguishing chamber, and a stronger dielectric resistance to accommodate the higher voltage. However, in actual environments with voltages lower than the design voltage, these structures may actually lead to insufficient arc-extinguishing voltage and delayed arc cooling, thereby prolonging the arc duration or causing reignition.
