An electrical circuit breaker is a safety device designed to protect electrical circuits from overloads and short circuits. It automatically interrupts the flow of electricity when it detects a fault, preventing potential damage to wiring and connected devices. This helps to avoid electrical fires and equipment failures. Circuit breakers come in various types, including miniature circuit breakers (MCBs) and residual current devices (RCDs), each serving specific functions. They can be reset after tripping, unlike fuses, which need to be replaced. Properly installed circuit breakers enhance the safety and reliability of electrical systems in homes and businesses.