FAILURE DETECTING APPARATUS

摘要

Provided is an inner monitor (6), which is mounted in a junction box (2) wherein electric pathways are provided with breakers (21a-21d), direct currents (Ia-Id) flowing in the electric pathways are detected by means of current sensors (22a-22d), and on the basis of the detected direct currents (Ia-Id), a reverse current flowing in the reverse direction is detected, and in the case where the reverse current is detected, the breakers (21a-21d) are thrown.