| 摘要 |
<p>Solid state overcurrent detector is provided with a current sensor means (200) having an OR circuit (130) connected by its input terminals to output terminals of burden circuits (41,42,43) and phase selecting circuit (400) for selecting largest phase connected by its input terminals to the output terminals of the burden circuits, the output terminal of the phase selecting circuit (400) is connected through a signal converting circuit (90) and an A/D converter (100) to a microcomputer (110) having a first level-discrimination means (110) and a first time-current operation means (150) with inverse time-current characteristics for various time interruptions responding to amount of overcurrent, and the output terminals of the OR circuit (130) is connected through a second level-discrimination circuit (140) to a sacond time-current operation circuit (150) for instant interruption.</p> |
