An MCB circuit breaker is an automatically operating electrical switch designed to protect an electrical circuit from damage caused by overcurrent caused by overload or short circuit. MCB it is used for purposes such as protection of circuits against short-circuit currents, protection of circuits against overload currents, switches, isolation. It is also suitable for use in household installations, commercial and industrial electrical distribution systems. MCB circuit breakers are manufactured in accordance with EN 60898-1 standards.