The Main Function Of A Drop-out Fuse Is To Protect The Circuit From Damage Caused By Overload Current.

When the system is overloaded, the current flowing through fuse drop out will cause the internal fuse temperature to rise continuously. The fuse is made of a copper-silver alloy with a specific melting point. Once the current reaches a dangerous level, the fuse melts due to overheating, generating an electric arc. At this point, the arc-extinguishing tube, heated by the arc, decomposes, releasing a large amount of gas. The pressure inside the tube increases rapidly, creating a strong longitudinal blow along the pipe, elongating the arc until it is extinguished.

After the fuse melts, the lower moving contact loses tension and flips downwards, unlocking the release mechanism. The fuse tube falls under gravity, creating a clearly visible disconnection point. This visible disconnection allows maintenance personnel to quickly identify the fault location, shortening the troubleshooting time for fault ht drop out fuse.