This paper presents the protection of PFI Plant Installation by using the circuit breaker element MCCB and MCB. Here MCCB and MCB are use as the alternator of HRC fuse. When the flows of current are crossing the rating limits on that moment MCCB and MCB will trip and disconnect as well as protect the circuit. If we use MCCB and MCB for PFI Plant Installation, it will be more applicable in our future life.