Fuji 6VKB34BR20 is a three-phase molded case circuit breaker used in industrial and commercial electrical systems for branch circuit protection. It provides overcurrent and short-circuit protection by combining thermal and magnetic trip mechanisms that open the breaker when current exceeds safe levels. The breaker is designed to fit Fuji breaker frames and is commonly installed in distribution panels, motor control centers, and power distribution equipment. Its manual on and off operation allows for circuit switching in addition to protection. This type of breaker helps safeguard wiring and equipment from damage due to overloads and electrical faults.