Design and implementation of an automatic three phase changer using LM324 quad integrated circuit was carried out. The system was designed and simulated using (Multisim). The circuit components were mounted a Vero board. LM324 integrated circuit (comparator) and 2N2222 transistors were used as active components alongside other passive components. Result shows that, when the three phase a.c inputs: red phase (P1), yellow phase (P2) and blue phase (P3) from public utility supply was fed to the system, the system compared the inputs with regard to phase imbalances, and the input with the highest voltage appears across the output.