International Journal of Scientific Research and Engineering Development

The present electrical systems require continuous power supply to support all domestic and business operations and industrial work. The three-phase system experiences total power loss when any of its three phases fails because this interrupts power supply to all connected electrical loads. This presents an Arduino-based Automatic Phase Changer (APC) system which continuously checks all three phases for power availability and voltage status to automatically switch between phases when one experiences power loss. The system uses voltage-sensing circuits together with relays and a microcontroller to enable automated switching which operates without requiring any manual control. The Arduino-based design achieves better operational flexibility because it enables accurate system performance assessment while allowing future development of IoT monitoring and fault detection capabilities. The system provides an effective solution at a low price point which businesses and hospitals and home users can use in their essential operations.

Mr.Bhanudas D. Tale, Dhanashri M. Pilare, Pushkar S. Karambe, Vishakha R. Bisane, Anurag A. Patil, Asmita V. Jamne,"An Automatic Phase Changer Using Arduino" International Journal of Scientific Research and Engineering Development, V9(2): Page(1090-1094) Mar-Apr 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.