RIBBON-TYPE FUSIBLE ELEMENT FOR HIGH-VOLTAGE FUSES AND FUSE INCLUDING THE ELEMENT

摘要

A fusible element for a full range clearing ability fuse for elevated circuit voltages such as, for instance, 5 to 15 kV. The fusible element has a configuration adapted to result in a wirelike time-current curve when forming part of a fuse. The fusible element has a center portion which is undulating on one side thereof and has end portions which are not undulating. The fusible element is wound helically and supported in a tubular casing in coaxial relation to the latter without resort to a supporting mandrel thereof. The fuse may be provided with several helically wound fusible elements supported by the pulverulent arc-quenching filler inside the casing and by means of special beads and in the absence of any mandrel support.