Overcurrent protection is added to each arc fault protection to start. When the power is re-applied after the DC power supply disappears, because the current does not change, it will not reach the overcurrent action condition, and the original arc fault protection power supply can recover from accidental trips. At the same time, the fault scope can also be judged by the action of the power line switch overcurrent element: that is, the fault of the power line switch overcurrent element action, starting arc fault protection trip; the non-fault side power line switch overcurrent element does not operate, This does not activate arc fault protection. Then adopt the over-current non-delay action to ensure the requirement of fast protection
