交流漏电判断部2a基于自交流漏电电流检测部1a输出的信号而判断交流的漏电的有无,电力供给阻断部3阻断自商用交流电源51供给至负载53的电力。直流漏电判断部2b基于自直流漏电电流检测部1b输出的信号而判断直流的漏电的有无,电力供给阻断部3阻断自直流电源52供给至负载53的电力。借此,不仅检测在连接于商用交流电源51的路径中产生的漏电,亦检测在连接于直流电源52的路径中产生的漏电而阻断来自产生漏电的路径的电源的电力供给。

An AC leakage determining section (2a) determines whether or not the AC leakage occurs according to a signal outputted by an AC leakage current detection section (1a). A power supply blocking section (3) blocks the power provided by a commercial AC power supply (51) to a load (53). A DC leakage determining section (2b) determines whether or not the DC leakage occurs according to a signal outputted by a DC leakage current detection section (1b). The power supply blocking section (3) blocks the power provided by a DC power supply (52) to the load (53). In this way, not only the leakage current in the path connected to the commercial AC power supply (51) is detected, but also the leakage current in the path connected to the DC power supply (52) is detected, and the power provided from the leakage path by the power supply is blocked.