Power supply device

摘要

There is provided a power supply device superior in safely which does not cause a second accident such as an electric shock even if the power cable is broken by chance. The power supply device provided with a power socket having a plurality of power supply terminals for supplying an alternating current supply with a predetermined voltage is provided with judgment means for judging whether or not breakage of a power supply path to the power socket has occurred based on whether or not electrical potentials of the plurality of power supply terminals each changes periodically to a first predetermined electrical potential and a second predetermined electrical potential lower than the first predetermined electrical potential, and blocking means for blocking power supply to the power socket when the breakage of the power supply path has been judged by the judgment means.