Drop type fuse is a common short-circuit protection switch, which has the characteristics of economy, easy operation and strong adaptability to outdoor environment. It is widely used in the branch lines of 10kV distribution lines and distribution transformers for primary side protection and equipment casting and cutting operation.

Fuse can be said to be a more used device in the circuit, as a protection device, in fact, this device is also a more typical equipment. As one of the more famous drop type fuse, mainly uses a certain connection parts to connect with the fuse, when the current in the circuit is overloaded, this device through its own thermal effect makes the fuse inside the fuse disconnected, thus breaking the circuit connection, played a role in protecting the circuit. In this process, because the drop fuse is generally installed in the 10 kV distribution line branch line, can reduce the scope of power failure, because it has an obvious disconnect point, with the function of isolating the current, the role is somewhat similar to the switch, so it is also a more characteristic protection device.

Its practicality is also a relatively high kind of fuse, but it also has certain defects. The station transformer drop type fuse is exposed to outdoor live operation for a long time, and will be broken due to serious corrosion and aging, which is its advantage and disadvantage.