Deciphering Gas Generation In Fuses: The Core Of Arc Extinguishing In Fuses

In power distribution lines, ejector fuses play a crucial protective role. The gas generation mechanism inside the fuse tube is a key technological aspect in interrupting fault currents.

High-temperature decomposition triggers gas generation

drop out fuse is connected in series in the circuit. When a fault current passes through, the fuse wire melts rapidly, igniting an electric arc. The arc temperature at this instant is extremely high, directly affecting the specialized gas-generating material inside the fuse tube. These materials (such as plexiglass or specific engineering composites) undergo a chemical decomposition reaction at high temperatures, instantly releasing a large amount of gas.

High-Pressure Gas Extinguishes the Arc

The newly generated gas is rapidly compressed within the narrow fuse tube, creating high pressure. This high-pressure gas stream is ejected longitudinally at high speed inside the tube, creating a strong "gas blowing" effect on the arc. The gas stream penetrates the arc column, forcibly cooling and carrying away ionized matter, causing the arc to extinguish successfully when the current crosses zero, thus completing the circuit interruption.