MCB Four Pole is a type of circuit breaker used in low-voltage electrical systems to protect circuits and equipment from overcurrents. It is called a four-pole because it has four poles or connections for the circuit conductors. The MCB four pole consists of a molded case that houses the circuit breaker components, such as the contacts, trip unit, and operating mechanism. The contacts are designed to open and close the circuit automatically in the event of an overcurrent.