| 摘要 |
<p>TOOL FOR MAKING AND BREAKING LOAD CURRENTS A portable tool for making and breaking high magnitude load currents is provided which is reliable in operation, can be used in applications lacking mechanical switching or cutout apparatus, and provides a secondary, visual assurance to the user when a load is broken. The device preferably includes a pair of vacuum bottle-enclosed, loadmaking and -breaking contacts, along with a seriesconnected pair of visually observable contacts exteriorly of the vacuum bottle. Spring-biased operating mechanism assures that the bottleenclosed contacts actually make and break the load current during use of the tool, while the secondary contacts are operated in sequenced relationship to the make and break contacts. When the device is used to break a current load, transparent portions of the tubular walls of the device permit the user to visually perceive a large open air gap between the secondary contacts.</p> |
