The PIC microcontroller will cause the circuit breaker to trip when the current of the load current reaches the setting value on the PIC microcontroller. The decisions will then be made with the help of the microcontroller and associated software. The microcontroller block is playing an important role in this project work. The microcontroller chip used in this project work is PIC 16F877A and this is like the heart of the project work. The PIC microcontroller 16F877A is a 40 pin IC. A system is something that maintains its existence and functions as a whole through the interaction of its parts. E.g. The body, humanity, access control, etc. A system is a part of the world, to choose a person or group of people for a certain time and for a specific purpose, to consider in its entirety, consisting of interconnected components, each component of properties marked as relevant to the destination selected.