Mechanical Linkage Mechanism When The Fuse Wire Of A Drop-out Fuse Blows

When an overload or short circuit fault occurs in the circuit, the fuse inside drop out fuse will heat up rapidly due to the thermal effect of the current. The fuse material is typically a copper-silver alloy or a tin-lead alloy, possessing precise melting temperature characteristics. Once the current exceeds the rated value, the fuse begins to melt at the weakest point, a process that lasts from milliseconds to several seconds.

The electric arc generated at the moment the fuse melts causes the gas inside the tube to expand rapidly. The fuse tube is made of phenolic resin or epoxy resin, with a gas-generating material coated on the inner wall. The high-temperature arc decomposes the gas-generating material, producing a large amount of gas, forming a longitudinal arc-blowing airflow. This airflow propels the arc towards both ends of the fuse tube, lengthening the arc, increasing resistance, and accelerating the arc-extinguishing process.