Abstract: This project to develop an automatic elegant mechanism for the three phase supply system. The project output rearranged automatically after a brief interruption in the event provisional fault while it remains in tripped condition in case of permanent fault. The main advantage of the project is, it is not only save the appliance but it will also show the category of fault that has been happened in the system so it will be easy for the operator to solve the problem effortlessly. It will also patterned whether the fault is permanent or provisional fault. If the fault is provisional fault then the supply will be returned after a premitive time of 15sec otherwise eternal trip signal is given to the relay.

| DOI: 10.17148/IJIREEICE.2021.9532