Protection Device Comprising a Plurality of Vacuum Fuses

摘要

A non-current limiting vacuum fuse employs a fusible assembly having a pair of electrodes and a fusible element that is situated therebetween. The fusible assembly is a rigid, self-supporting unitary structure that is brazed to an envelope when manufactured inside a vacuum furnace. The fuse provides improved interruption capability and/or a higher voltage rating at reduced cost. The fuse may be used individually, or a plurality of the fuses can be connected together in series to provide enhanced interruption capability and/or a higher voltage rating. The fuse can be connected in parallel with a current limiting fuse to form a vacuum current commutating fuse that provides the benefits of both types of fuses.

主权项

1. A protection device structured to be electrically connected with a protected portion of an electrical circuit, the protection device comprising:
a fuse apparatus comprising a plurality of fuses; at least some of the fuses of the plurality of fuses each comprising an envelope having a hollow interior region, a pair of electrodes, and a fusible element, the pair of electrodes being situated on the envelope, the fusible element being electrically interposed between the pair of electrodes, the fusible element being situated within the interior region, the interior region having a reduced pressure therein; and at least some of the fuses of the plurality of fuses being electrically connected together in series.