| 摘要 |
PURPOSE:To make it possible to actuate a breaker for the corresponding distribution unit without an error when the power-supply to either one of the plural distribution units is to be turned off by providing for each of the distribution units an displaying lamp which is illuminated when receiving the direct current power from a direct current power-supply unit. CONSTITUTION:In one housing 1, distribution units 41 and 42 are arranged to output an alternating current by the on/off of breakers B1 and B2 when receiving the alternating current. There are provided the direct current power-supply units 31 and 32 which receive the alternating current and output the direct current by the on/off of switches S1 and S2, and the units 21 and 22 which receive the direct current thus output. Plural sets of these combinations are arranged. In this respect, the displaying lamps 51 and 56 are provided. These lamps are illuminated when receiving the direct current from the direct current power-supply units 31 and 32 which are caused to become the distribution units 41 and 42 themselves and supply the alternating current. In this way, when one power-supply for the unit 21 is turned off, the switch S1 of the corresponding direct current power-supply unit 31 is switched off. Then, the breaker of the distribution unit the displaying lamp of which is not illuminated is turned off, hence making it possible to operate the cut-off assuredly. |
