| 摘要 |
<p>One electrode is rigidly fitted into a hollow metallic cylinder and the other electrode is coaxially fixed within the cylinder through a cylindrical insulation. An insulating disc is opposite to the cylindrical insulation to form then an annular arrow gap between them. The gap is filled with a self-restoring type current limiting material to normally form a current passageway between both electrodes. The current limiting material is caused to be first evaporated in a narrower portion of the gap in response to a flow of overcurrent through it. After the current has been limited, the evaporated material is rapidly self-restored to its original good electrically conductive state.</p> |
