The technology “Fault Current Limiter” developed at ERDA, Vadodara is at Lab scale. MCB’s and Fuses are used to prevent  excessive current flow. MCB is expensive while the Fuses cannot be reset. A new polymeric material having non-linear properties is developed. The polymeric material’s electrical resistance increases more than thousand times on exposure of temperature of about 130 deg Celsius very rapidly and this phenomena is reversible. This polymeric material can be used to use the MCB at a higher short circuit label. When FCL is used in series with MCB’s with lower short-circuit breaking capacities during fault condition, the let through energy (i²t) through MCB is less than the designed value. When short-circuit current of the system is greater than the rated breaking capacities of MCB, limiting of fault current up to rated breaking capacities of MCB’s is possible with the use of FCL in series. 

Hence, there is no need for use of expensive and complicated Molded Case Circuit Breaker (MCCB) having higher breaking capacity. It was observed that the short circuit interruption capability of a MCB of 6KA can be increased to 25KA by incorporating this polymeric material.