Ensuring a reliable power supply is essential for critical infrastructure, especially in urbanised areas where power demands are high. However, an inconsistent power supply can cause serious interruptions, harm to electrical equipment, and monetary losses. Conventional approaches to power supply management frequently experience challenges in addressing these issues, which results in instability and frequent power outages. This project presents an intelligent automatic phase selector designed to maintain a continuous power supply automatically switching between available power phases during disruptions. It is made up of an ATmega328P-PU Microcontroller, Transistors (TIP41) relay, current sensors, voltage sensors, phase detectors, and 16x2 LCD to develop and implement the intelligent automatic phase selector. The project was then implemented and tested successfully. Test results showed that This system effectively detects phase failures and automatically switches to the most stable and available phase, thereby preventing downtime and protecting sensitive equipment from power interruptions. The prototype is cost-effective and achieves the required automatic functionality.