What is the difference between a dropout fuse and switch disconnector

Drop-out fuse is the most commonly used short-circuit protection switch for branch lines of 10kV distribution lines and distribution transformers. It is economical, easy to operate, and adaptable to outdoor environments. It is widely used in 10kV distribution lines and power distribution The primary side of the transformer is used for protection and equipment switching and switching operations.
Disconnector switch , that is, in the divided position, there is an insulation distance between the contacts that meets the specified requirements and an obvious disconnection mark; when it is in the closed position, it can carry the current under normal circuit conditions and abnormal conditions within the specified time- For example switching devices for current under short circuit.

The main feature of the switch disconnector is that it has no arc extinguishing ability, and can only open and close the circuit under the condition of no load current. The switch disconnector is used at all levels of voltage to change the circuit connection or to isolate the line or equipment from the power supply. It has no current interruption capability and can only be operated after disconnecting the line with other equipment. Generally, there is an interlock device to prevent misoperation of the switch under load, and sometimes a pin is required to prevent the switch from being disconnected under the magnetic force of a large fault.