Class CC Fuses are both fast-acting and current-limiting, and are the ideal protective product in applications were a fast overload response is required. This cartridge fuse has a rating of 15 Amps and 600 Volts. Fuses are a necessary component in an electrical circuit because they offer an essential protection by acting as the weakest point in a circuit. When a current is too strong, the fused element inside a fuse will heat up and break so that the current can no longer complete the circuit.