FAILURE DETECTING APPARATUS

摘要

Circuit breakers (21a to 21d) are provided in electric paths. Current sensors (22a to 22d) detect direct currents (Ia to Id) running through the electric paths, and detect a reverse current running backward based on the detected direct currents (Ia to Id). When the reverse current is detected, an internal monitor (6) mounted on a junction box (2) opens the circuit breakers (21a to 21d).