| 摘要 |
1445924 Fuse SIEMENS AG 4 Feb 1974 [5 Feb 1973 12 Nov 1973] 05143/74 Heading H2G A fuse device where, on the melting of a fusible link an arc is formed which is magnetically distorted and hence quenched, comprises a fusible link 2 joining the bottom of two horn electrodes 5, 6 said link being within a narrow arc-quenching inner chamber which in turn is surrounded by an outer chamber, at least one wall of both chambers being pierced by holes. In the embodiment shown the top wall 46 of the outer chamber has through bores 38 and there exists a channel of width a between the inner and outer chamber. The magnetic effect of the current loop between connectors 14, 18 is enhanced by slots 20, 21. The inner chamber is defined by electrodes 5, 6 and walls 30, 31, 40, 41 and 32 and an insert 54 the insert being partly or wholly of readily gasifiable material. The width d is not substantially greater than the diameter of the fuse link. The inner chamber walls may be of ceramics, slate or flaky asbestos or mica-containing plastics. The bore holes 34-37 and 39 make up between 30-50% of the total area of the inner chamber. Walls 40, 41 may be provided with recesses containing inserts 60, 62 of readily gasiflable material. Alternatively, the walls 40, 41 may be partly or wholly coated such material which comprises halogen-containing epoxy resins, melamine resins and polyhydromethylene and other suitable plastics. Dimensional ranges for the holes (which need not be round), wall thicknesses, and the fusible link are given in the Specification for various operating ranges. Electrodes 5, 6 and connectors 16, 18 are of high conductivity material such as copper. |
