Blade fuses are a type of electrical fuse used to protect circuits from overloads and short circuits. They are characterized by their flat, rectangular shape and two metal prongs that fit into a fuse holder. When excessive current flows through the fuse, the metal strip inside melts, breaking the circuit and preventing damage to electrical components. These fuses are commonly found in automotive applications, such as in cars and trucks, as well as in various household appliances. Blade fuses come in different amperage ratings, allowing users to select the appropriate fuse for their specific electrical system needs.