How Do Drop-out Fuses Prevent Overcurrent From Damaging Circuits And Equipment?

In power systems, the fusible element is in a conductive state under normal current conditions. When an overcurrent (such as a short circuit or fault current) occurs, the fusible element melts rapidly, causing the movable contact of 33kv fuse to "fall" to the breaking position, thereby cutting off the current path.

Furthermore, the structural design of cover drop out fuse facilitates arc breaking. Air or gaseous medium rapidly cools or stretches the arc through injection or exhaust channels, allowing the arc to terminate stably during the breaking process and preventing the arc from continuing to cause high temperatures or further damage.