www.fanox.com Rev. 26 68/188Next, different cases will be described. The feeder and supply will trip their functions as they see the fault. Supply’s time ofoperation is shorter than feeder’s time, so the feeder will open its breaker, making thefault disappear, and it will block the supply trip output preventing the opening of thesupply’s breaker. The feeder and supply will trip their functions as they see the fault. Supply’s time ofoperation is larger than feeder’s time, so the feeder will open its breaker, making the faultdisappear, and block the supply function. The supply will not trip because the feedermakes the fault disappear before its time of operation is finished.
