Why Are Drop-out Fuses Required To Have Leakage Protection Function?

In power distribution network practice, electrical equipment faults include not only overcurrent and short circuits, but also leakage current due to insulation aging, humid environments, or external damage to lines. The standard drop out fuse unit lacks an internal leakage detection mechanism, and its protection behavior is only for high current events, unable to respond to circuits with minor leakage conditions. If leakage current is not detected in time, it may lead to equipment damage or premature failure of power supply facilities.

To improve the overall power system's immunity to disturbances, the leakage current protection function is integrated into the drop out type fuse to expand its protection boundary. Integrating leakage current detection capabilities, it can take action when unbalanced current or ground leakage is detected by the dropout fuse of transformer, thereby enhancing the overall response capability of the power supply line.