| 摘要 |
PROBLEM TO BE SOLVED: To switch a power supply which drives a load easily. SOLUTION: A temporary disconnector 28 connected to a temporary power supply 36 and a power supply switching device 29 are provided in a unit 21 with a main circuit 34. The movable conductor 49 of the power supply switching device 29 is connected to the primary side of an electromagnetic contactor 25. When a load 33 is driven by an ordinary power supply connected to a bus- bar 30 as an ordinary case, the movable conductor 49 is transferred to a left side and connected to a 1st terminal 41. When the ordinary power supply is cut off at the inspecting of a plant, etc., in order to drive the load 33, the movable conductor 49 is transferred to the right side and connected to a 2nd terminal 42. As a result of this, the load 33 can be driven by the temporary power supply 36. |
