| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board for open-phase detection that is usable for both three-phase three-wire AC power supply and three-phase four-wire AC power supply with one circuit board to hence reduce a cost, and also to provide an electric apparatus. SOLUTION: By selection of components mounted on this circuit board 10 for open-phase detection, an failure detection circuit 2 adapting to foreign-made 400V-class three-phase four-wire AC power supply 1, and an failure detection circuit 3 adapting to domestic 200V three-phase three-wire AC power supply 20 are constituted selectively on the circuit board 10 for open-phase detection. COPYRIGHT: (C)2011,JPO&INPIT |
