This document discusses different types of fuses. It begins with an introduction that defines a fuse as an over-current protection device with a metal element that melts when too much current flows to interrupt the circuit. It then discusses how fuses are constructed and how they work. The main body of the document categorizes different types of fuses, including low voltage rewireable and cartridge fuses, drop-out fuses, striker and switch fuses, high voltage HRC cartridge and liquid fuses, and other minor fuse types. It provides brief descriptions and examples for each fuse category.