| 摘要 |
PURPOSE:To contain two circuit sections of a main circuit device in one drawer unit by providing a preliminary power source bus and an auxiliary power source plug in a cable chamber. CONSTITUTION:A solenoid switch 11 is connected in parallel with a wiring breaker 10 connected through a first main circuit contactor 5 of a main circuit device to a vertical bus 4, and a preliminary power source bus 15 connected in parallel with the bus 4 through a preliminary power source bus solenoid switch 14 is provided at a power source bus 3. A main circuit leading plug 7 having a cable 9 connected to a load and a detachable auxiliary power source plug 16 are provided at the bus 15 disposed in a cable chamber 8. Thus, if a certain load requires maintenance, when the switch 14 is closed and the plug 7 in the same drawer unit 13 is inserted to the corresponding plug 16, a load which does not require maintenance is applied with power from the bus 15. Thus, its operation can be continued. |
