A changeover switch is an electrical device that connects two different sources of electric power to a single load. They are commonly used to switch between two electric power sources or transfer power from one source to another. Changeover switches are available in a variety of sizes and configurations, depending on the application. The most common type is a toggle switch, which is operated manually by the user. Other types include rotary, push-button, and automated switches that can be programmed to switch between power sources at predetermined times. Changeover switches are used in a wide range of applications, including industrial, commercial, and residential settings.