Mechanical and digital time switches control the switching on and off of connected devices. Time switches are available for rail mounting as well as for integrated and set-up execution. They manage, for example, the overnight shutdown of a heating system. With numerous features such as winter-summer time changeover and holiday programs they are easy to use and low maintenance. An astronomical timer allows regulation based on sunrise and sunset. Power outlet time switches are used for some equipment, such as heaters or lamps. Programmable time switches offer a much higher functionality. When installed in a distribution box, multiple channels can be operated and different cycles of operation can be programmed.