Abstract:
A high-voltage fuse for interrupting both protracted overload currents and major fault currents and operating as a currentlimiting fuse when interrupting major fault currents. The fuse includes one or more fusible elements each operating in the fashion of a composite fusible element including serially connected ribbon sections and a wire section interposed between, and spot-welded to, the ribbon sections. In fuses according to this invention one single stamping, i.e. one single length of sheet silver stock takes the plate of a spot-welded composite of ribbon sections and a wire section. The wire like effect is achieved by providing an oblong hole, or window, in the center region of the ribbon fuse link, resulting in the formation of two wire-like strips of small cross-sectional area to both sides of the oblong hole or window.
Abstract:
A high-voltage fuse having a helically wound ribbon fuse link forming an extension-springlike structure. The ribbon fuse link is entirely self-supporting, not requiring any support between the ends thereof other than a pulverulent arc-quenching filler.
Abstract:
A low-voltage fuse, and in particular a low-voltage fuse of the polyphase variety, has a specific array of fusible currentcarrying means arranged between juxtaposed surfaces of a pair of spaced terminal bars. These surfaces are provided with grooves extending in a direction longitudinally of said pair of terminal bars. The aforementioned array of current-carrying means is formed by a plurality of stampings of silver or copper, each including a pair of spaced terminal strips and each further including a plurality of terminal-strip-interconnecting fusible elements in ribbon form. The length of each of said fusible elements of said plurality of stampings exceeds the spacing between said pair of terminal bars. The aforementioned stampings are inserted with the terminal strips thereof into the grooves of said pair of terminal bars in such a way that all constituent fusible elements of each of said plurality of stampings are out of registry with any of the constituent fusible elements of any other of said plurality of stampings. The constituent fusible elements of said stampings are further bent alternately in opposite directions away from the median plane of said pair of terminal bars, thus assuming a substantially C-shaped configuration.
Abstract:
An electric cartridge fuse includes a tubular main casing and a tubular sub-casing inside of the main casing. The latter is closed at least one one side thereby by an additional cover means resting against an axially outer edge of the sub-casing and held in position by a radially outwardly projecting bulge formed in the fusible element of the fuse and engaging the cover means adjacent the center thereof. Further disclosed are other applications of the fusible element bulge concept for positioning partitions in electric cartridge fuses.
Abstract:
An electric fuse has a casing which is closed by terminal plugs having a relatively large axially extending internally screwthreaded bore. A screw closing the bore has an axially extending bore of relatively small diameter which houses a spring-biased blown fuse indicator mechanism.
Abstract:
A high-voltage fuse having a plurality of helically wound ribbon fuse links forming extension-springlike structures arranged in a cylindrical pattern. The ribbon fuse links are entirely selfsupporting, not requiring any support between the ends thereof other than a pulverulent arc-quenching filler.