Cartridge fuses are safety devices used in electrical systems to protect against overloads and short circuits. They consist of a cylindrical body filled with a metal wire that melts when excessive current flows through it, breaking the circuit and preventing damage to electrical components. These fuses are commonly found in residential and industrial settings, often housed in fuse holders or panels. Unlike traditional fuses, cartridge fuses can handle higher current ratings and are designed for easy replacement. They are an essential part of electrical safety, ensuring that circuits operate within safe limits to prevent fires and equipment damage.