Abstract: The proposed design in this paper is to design and implementation of automatic selector switch with high and low levels protection for A.C 220 volts. The purpose of this research to avoiding using of a manual selector switch inside the customers electric power supply cabinet. The mains goals of the proposed design are, first avoid approaching anyone from the homes electric power supply cabinet through design of an automatic device to perform the conversion of right electric power line without human intervention. Second, supply safe and stable electrical power for homes in all time and ensure the operation of household appliances without any stopping time. There'd, provide the protection of household appliances from the high rise to the level of input voltages to more than 250 volts, or falling the level to less than below 175 volts, in addition to displays the output status of the system in a Liquid Crystal Display (LCD) and Light Emitting Diode (LED). The proposed design is done by using Arduino Uno board, step down transformer, drivers, relays, LCD and some of capacitor, resistor and diodes. The prototype design result implementation are shown in Table 1 and the Fig. 4, 5, 6 respectfully.