Low current-carrying capacity time lag fuse
阅读：368发布：2021-04-13
专利汇可以提供Low current-carrying capacity time lag fuse专利检索，专利查询，专利分析的服务。并且An electric current-limiting fuse includes a fusible element in the form of a wire and means arranged along the wire which perform the dual function of producing significant time lags when the fuse is carrying overload currents, and of producing highly effective series multibreaks when the fuse is subjected to major fault currents.，下面是Low current-carrying capacity time lag fuse专利的具体信息内容。
1. An electric current-limiting cartridge fuse of the time lag type including in combination a. a tubular casing of electric insulating material; b. a pair of electroconductive terminal elements arranged at the ends of said casing and closing said casing; c. a pulverulent arc-quenching filler inside said casing; d. an elongated strip of electric insulating material arranged inside said casing and submersed in said arc-quenching filler; e. a plurality of spaced metallic overlays arranged on one side of and affixed to said strip; f. a fusible element in the form of a wire having ends conductively connected to said pair of terminal elements and having a portion intermediate said ends thereof wound substantially helically around said strip in such a way that each turn of said fusible element engages one of said plurality of spaced metallic overlays; and g. a plurality of solder joints each on one of said plurality of metallic overlays and each thermally connecting one point of said fusible element to one of said plurality of metallic overlays.
2. A current-limiting fuse as specified in claim 1 wherein saId strip of electric insulating material is of an insulating material evolving arc-quenching gases when subjected to the action of electric arcs, and wherein said fusible element is in the form of a wire of silver.
3. A current-limiting fuse as specified in claim 2 wherein said strip of electric insulating material is of a melamine-glass-cloth laminate.
4. An electric current-limiting cartridge fuse of the time-lag type including in combination a. a tubular casing of electric insulating material; b. a pair of terminal caps closing said casing at the ends thereof; c. a filler of quartz sand inside said casing; d. an elongated strip of an insulating material evolving gas under the action of electric arcs arranged inside said casing and submersed in said filler of quartz sand; e. one side of said strip being provided with a plurality of metallic overlays spaced in a direction longitudinally of said strip and the other side of said strip being bare; f. a fusible wire of silver having end portions and a center portion, said end portions being conductively connected to said terminal caps and said center portion zig-zagging between said one side of said strip and said other side of said strip and engaging said plurality of metallic overlays on said one side of said strip; and g. a plurality of solder joints each connecting one of said plurality of metallic overlays and said fusible wire of silver.
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