| 摘要 |
PURPOSE: To enable selectively connection of an electric load to any of a plurality of branch lines by providing a power switching circuit with a selector switch, a TRIAC and other devices. CONSTITUTION: In a power switching circuit 20, an electric load 30 having a first and a second input connection line 32, 34 is selectively connected to any one of a plurality of branch lines 19-1-19-3. Triacs are connected between first conductors L1-L3 of the branch lies 19-1-19-3 and the first input connection line 32 of the load 30 and are selectively connected and disconnected electrically. The triacs are connected also between second conductors N1-N3 of the branch lines 19-1-19-3 and the second input connection line 34 of the load 30 and are selectively connected and disconnected electrically. A controller is driven by a selector switch 24. By this method, a load current is kept in balance among the branch lines 19-1-19-3 of the distribution system. |
