| 摘要 |
<p>The housing is tightly sealed. Each movable contact is operated by a driving mechanism, part of which is mounted inside the housing. The switch has a conducting plate movably mounted in the housing. It is electrically connected to the housing or to earth and it is mechanically connected to the driving mechanism for the movable contact, so that at the end of opening contact movement it is inserted between the fixed and the movable contact.</p> |
