A three phase circuit breaker is an electrical device designed to protect electrical circuits from overloads and short circuits. It operates by interrupting the flow of electricity in three separate phases, ensuring balanced protection for three-phase systems commonly used in industrial and commercial applications. These circuit breakers can automatically detect faults and disconnect the power supply, preventing damage to equipment and reducing the risk of electrical fires. They are essential for maintaining safety and reliability in systems that require a consistent power supply, such as motors, transformers, and large industrial machinery.