A circuit-breaker is an electrical device that is used to protect an electrical circuit from damage caused by overload or SHORT circuit. It consists of a FUSE, SWITCH, SHORT, and AMPERE. A FUSE is a safety device that is designed to protect an electrical circuit from excessive current. A SWITCH is an electrical component that can be used to control the flow of electricity in a circuit. A SHORT is an electrical fault in which the current flows through an unintended path. An amp is a unit of electrical current, and an AMPERE is the unit of electrical current equal to one coulomb per second.