Abstract: There is provided by this invention a current limiting fuse having a fuse element wound about support means consisting of a non-stoichiometric oxide core that produces an electro-negative gas when heated by the melting fuse element. The generation of the electro-negative gas results in more rapid and efficient arc extinction.

Abstract: There is provided a current limiting fuse having a uniform and supported element with arc voltage controlling and shaping capabilities that can withstand high mechanical and electrical stress.

Abstract: There is provided by this invention a current limiting fuse having a zinc oxide core electrically connected in parallel with an array of wire fuse elements capable of shaping and controlling the arc voltage developed during current interruptions.

Abstract: There is provided a current limiting fuse having an electrically parallel connected non-linear resistor element for limiting and shaping the arc voltage developed during current interruption.

Abstract: A current limiting fuse with a fuse element disposed over relatively movable portions of a mandrel including movement means for moving the mandrel which means includes an actuating wire having an end portion extending out of the fuse casing which end portion is connected in parallel in an otherwise closed circuit with electrical leads extending to the fuse element.

Abstract: An electrical fuse is taught having a ribbon-like fuse element therein. The fuse element has a generally uniform width along its length, but the depth of the fuse element is tapered in some regions. Holes or openings of various shapes are disposed along the length of the fuse through the depth thereof. The holes may be circular, triangular, or rectangular in shape and may be through a central portion of the fuse element or may comprise notches at the edges of the fuse element or both. The depth of the fuse element may increase with longitudinal distance from a relatively thin central portion of the fuse element to relatively thick end portion thereof, or vice versa. During low current clearing, the relatively thin portion will melt first and then burns back along the tapered portions until the fault current is extinguished.

Abstract: This concerns a fuse of the type having a central mandrel or fuse spider around which is wound one or more fuse elements. At least one longitudinal strut of the mandrel is disposed to be freely rotated about its axis within limits during a fusing operation. Ideally, spaced struts are disposed to rotate in opposite directions about their axes. The aforementioned fuse element is fixedly secured to the struts so that the opposite rotational movement will strain each fuse element after a fusing operation has begun, thus mechanically breaking those fuse elements in several places to enhance the low current clearing capability of the fuse. An appropriate device for causing the rotation is provided. The device may be driven by an electrically actuated, highly controlled explosive charge which moves a plunger which in turn actuates interlinked levers, thus causing the desired rotation. The foregoing fuse is especially helpful in current limiting operations for high voltage, low current situations.

Abstract: A high voltage current limiting fuse is taught which has a plurality of radially oriented, notched, pleated fuse ribbons. The fuse ribbons feed through radial slots in spacers at either end of the fuse barrel. A double fold in the fuse ribbon in the region of the slot in each case provides a locking terminal for abutting the fuse ribbon against the spacer. In addition, the double fold arrangement allows the fuse ribbon to be routed conveniently radially over the edge of the spacer and along the side of the fuse barrel, between the fuse barrel and the inside of a ferrule. This secures the end of the fuse element and provides electrical continuity between the fuse element and the ferrule.