554020011 is a 3 pin 24 hour Time Switch, with ON/OFF operations per day. It performs the same sequence of switching operations on each day and can be easily adjusted using the small levers located on the dial. There is also a ‘Day Omit’ device which means you have the capability of selecting any number of days in the week that you wish to disable the switching cycle. The Q554-2 is suitable for heating, ventilation and control equipment applications. There is also a 100 hour battery reserve, which is useful if there is a power cut. The 24 hour programming time switch cycle performs the same sequence of switching operations on each day and can be quickly and easily set using the small manual levers on the dial. A “day omit” device allows you to select any number of days in the week on which the switching cycle can be disabled. A general purpose timeswitch for heating, ventilation and equipment control applications.