A Miniature Circuit Breaker (MCB) is an electrical device designed to protect electrical circuits from overloads and short circuits. It automatically switches off the electrical supply when it detects a fault, preventing potential damage to wiring and connected devices. MCBs are commonly used in residential and commercial buildings for safety and reliability. MCBs come in various ratings to accommodate different electrical loads and are easy to reset after tripping. They are more efficient and safer than traditional fuses, as they can be reused without replacement. This makes MCBs a popular choice for modern electrical systems.