What are AFDD and AFD
What are AFDD and AFD? Arc fault protection devices (AFDD) are products installed by professionals in homes and similar places to reduce electrical fires on the load side. When an arc fault is detected, the AFDD disconnects the fault circuit. Arc fault detector (AFD) is a detector used to detect arc faults in the protected electrical circuit. It disconnects the fault circuit by outputting a control signal. Background of arc fault protection devices As we all know, residual current protectors can achieve leakage protection and arc fire protection caused by relative ground by controlling zero-sequence current. However, in fact, residual current protectors, fuses or small circuit breakers cannot reduce the risk of electrical fires caused by series arcs or parallel arcs between live conductors. Electrical fires mainly come from: "series arc" or "parallel arc" short circuits caused by poor contact or damaged insulation of electrical lines (mostly carbonization caused by...