When current-carrying contacts are separate from each other the arc is produced in between them. To minimize the arc effect we used an insulating Medium for example Dielectric Oil, Sulpher Hexa Flouride(SF6) Gas and vacuum. In normal conditions, the Circuit breaker contacts are closed until the system becomes faulty. when a fault occurs in a system the Relay generates a Signal to the trip coil of the circuit breaker and energizes the trip coil