| 摘要 |
<p>An electric fuse has fuse conductors which consist of two metals e.g. copper and silver arranged so that the current passes from one terminal through copper and silver alternating. By means of reductions in cross section in the silver parts fuse elements are created. The silver parts are so short that the arc quickly burns between footpoints on the copper parts, thereby giving a higher arc voltage than silver. The fuse will endure currents very close to its rated curent for extended periods of time and still give reliable operation for only a small over-current.</p> |
