| 摘要 |
PURPOSE:To protect the power sources of a document preparing device, an electronic computer, etc., by providing power breakers between a parent power source and a plurality of child sources, and determining the order of interruption at the time of overcurrent flowing through house wiring. CONSTITUTION:Besides a limit current value, current interruption order, current flow return order, and a return current value are set beforehand in a microcomputer 5. Each time a detected value of a current detecting means 4 exceeds the limit current value, relays 3a, 3b, and 3c are controlled in the specified current interruption order, and current flow to child power sources 2a, 2b, and 2c is interrupted. Besides, current flow to the child power sources 2a, 2b, and 2c is returned in the specified current flow return order. Incidentally, a document preparing device, etc., are to be connected to a child power source 2c whose current interruption order is last. |
