Abstract: The present invention provides a fuse unit which facilitates a work such as inspection and a method of manufacturing the fuse unit. Disclosed is a method of manufacturing a fuse unit, which has a metal part including an input terminal and an external connection terminal and a connector part for attaching an external terminal C3 to the external connection terminal and is manufactured by integrating the metal part and a resin covering body by insert molding. In this manufacturing method, the metal part and the resin covering body are integrated by insert molding such that a distal end of the external connection terminal of the metal part protrudes from the resin covering body, and then, the connector part separate from the resin covering body is attached to the resin covering body so that the external connection terminal protruding from the resin covering body can be connected to the external terminal C3.

Abstract: A fusible link unit includes a conductive bus-bar having a fusible portion, a resin housing molded integrally with the bus-bar and including a locking projection, and an exposing window portion for exposing the fusible portion, such that the resin cover is capable of being locked to the locking projection so as to cover the fusible portion, where a half-fitting prevention projection is provided at a periphery of the exposing window portion to prevent half-fitting while suppressing an increase in projection costs.

Abstract: A fuse element and a method for manufacturing the same, are provided whereby the fuse element consists of an active response part which is advantageously formed by at least two parallel metal sub-strips of an elongated fuse metal foil including leading and trailing parts for electrical connection of each fuse element. The elongated fuse metal foil can be reinforced by an elongated dielectric base layer made of polymer material. Accordingly, performance of such a fuse element can be increased and manufacturing costs can be decreased. The fuse element especially can be applied to a plurality of capacitor sub-units being integrated in housings and submerged in a cooling and insulating liquid within the housing.

Abstract: A fuse used in a semiconductor memory device. The fuse is formed with a “X” shape where one circuit may be connected simultaneously to a plurality of other circuits. As a result, a fuse region is reduced, and the cutting number is also decreased, thereby lowering the possibility of defects resulting from cutting errors.

Abstract: A surface mount current fuse of the present invention includes a first base which has a recess and is smaller in width at the other end than at one end in the longitudinal direction, and a second base which has the same shape as the first base. The first base and the second base are combined to form a box-shaped body by joining the lower surface of the second base to the upper surface of the upper surface of the first base in such a manner that one end of the first base and the other end of the second base are in contact with each other. The recess of the first base and the recess of the second base form a space portion in which to dispose an element portion. The borderline between the first base and the second base passes through the center point on a side surface of the body. As a result, the surface mount current fuse has high production efficiency.

Abstract: A current protection device comprises a substrate having an upper portion and a lower portion; a fusing layer installed between the upper portion and the lower portion; ends of the fusing layer exposed from the substrate; a cavity formed near surfaces of the fusing layer for providing a space to receive the fusing layer as the fusing layer fuses; and an end electrode having three layers including a silver thin layer, a nickel thin layer and a tin thin layer; the end electrode being formed as a conductive electrode. The method for forming the same is provided.

Abstract: The invention relates to a fuse system for a switchgear assembly, especially for a medium voltage switchgear assembly. The fuse system comprises a plurality of fuses which correspond to the number of phases, every fuse having a tripping bar that projects from the face of the fuse under the effect of the force of a spring when the fuse comes into action. A sealing body, with a spring arrangement interposed, pushes a sealing head into the interior of a receptacle receiving the fuse. A two-armed lever is received on the sealing head, one arm covering a tripping mechanism which actuates a power switch.

Abstract: According to the present invention, n (n=S is a positive integer) pieces of interrupting grids (22-1, 22-2, 22-3, - - - , 22-(n-1) and 22-n) are provided, each of the interrupting grids encompasses P pieces of narrow cut-off canals arranged in parallel. The both side of each of the narrow cut-off canals are concaved so that the narrow cut-off canal has a waisted-mortar shape. The waisted-mortar shape is delineated by m pieces of elliptical holes (Q1, Q2, Q3, - - - , Qm-1 and Qm (m=P?1 is a positive integer)) arranged adjacently in parallel and semi-elliptical holes (cut ID portions) provided on both sides the alignment of elliptical holes. Then, n pieces of the interrupting grids 22-1, 22-2, 22-3, - - - , 22-(n-1) and 22-n are arranged in series through jointing zones (heat-radiation zones) (21-1, 21-2, 21-3, - - - , 21-(n-) and 21-n) having a length of 2.5 millimeters or less measured in the series direction.

Abstract: A method for manufacturing a fuse of a semiconductor device comprises forming an island-type metal fuse in a region where a laser is irradiated, so that laser energy may not be dispersed in a fuse blowing process, thereby improving repair efficiency.

Abstract: Provided are an electrical fuse device and a method of operating the same. The electrical fuse device may include a fuse link having a multi layer structure with at least two metal layers. The number of metal layers that are blown, from among the at least two metal layers, may vary according to either the duration of application of voltage or the strength of voltage applied.

Abstract: A surface mount fuse having a plurality of fusible links is provided. The links are located on opposite sides of an insulative substrate or one otherwise thermally insulated or decoupled from one another. The fuse links entered to terminals that can be asymmetrically secured to the substrate to discourage improper mounting. The fuse protects multiple different circuits or loads having a same common or grounded line.

Abstract: A fuse structure of a semiconductor device includes a fuse pattern having a contact portions at opposite ends of the fuse pattern, wherein the fuse pattern includes a first conductive layer and a second conductive layer stacked sequentially, and a first electrode and a second electrode connected to the contact portions respectively. The fuse pattern is configured to be electrically shorted during a fuse program operation. A bottleneck portion can be formed at the center of the fuse pattern spaced apart from pad portions formed at opposite ends of the fuse pattern to which an electrode is connected, enabling breakage of the fuse pattern to be spaced apart from a contact portion of the electrode. As a result, a profile of a portion broken after a fuse program operation is improved and leakage current caused by a poor profile is suppressed.

Abstract: A fuse having a plurality of configurable thermal ceilings. The fuse includes a housing, a first conductive cap, a second conductive cap, a plurality of conductive elements extending through the housing, and a conductive connector that is electrically coupled to a conductive element. One or more conductive elements are electrically connected to the first conductive cap at any one time.

Abstract: A fuse element is formed integrally from a conductive metal plate such that two narrow portions are formed side by side between a pair of electrical connection portions. The narrow portions each assume an arch shape and constitute a parallel conductive path. Arch-shaped convex portions are arranged so as to oppose to each other with a predetermined gap therebetween, thus constituting a fusing portion.

Abstract: Tolerance to ESD is increased in an electronic fuse by providing at least one non-conductive region adjacent to a conductive region on the surface of an insulator. Such an arrangement reduces the thermal stresses imposed on the insulator in high current applications. Where multiple conductive and adjacent non-conductive regions are disposed on an insulator, the fuse can fail in discrete steps, thus providing a well defined and easily detected transisition to a blown state, as well as providing a stepwise increase in resistance between prescribed resistance values.

Abstract: A novel fuse structure. An optimal position of laser spot is defined above a substrate. A first conductive layer is formed on part of the substrate. A dielectric layer is formed on the substrate and the first conductive layer. A second conductive layer comprising the position of laser spot is formed on part of the dielectric layer. A third conductive layer is formed on the part of the dielectric layer placed above the first conductive layer, wherein the third conductive layer is insulated from the first and second conductive layers. At least one conductive plug penetrates the dielectric layer, to electrically connect the first conductive layer and the second conductive layer. Thus, the third conductive layer serves as a floating layer to prevent the first conductive layer from being damaged in the laser blow process.

Abstract: A novel fuse structure. An optimal position of laser spot is defined above a substrate. A first conductive layer is formed on part of the substrate. A dielectric layer is formed on the substrate and the first conductive layer. A second conductive layer comprising the position of laser spot is formed on part of the dielectric layer. A third conductive layer is formed on the part of the dielectric layer placed above the first conductive layer, wherein the third conductive layer is insulated from the first and second conductive layers. At least one conductive plug penetrates the dielectric layer, to electrically connect the first conductive layer and the second conductive layer. Thus, the third conductive layer serves as a floating layer to prevent the first conductive layer from being damaged in the laser blow process.

Abstract: The fuse is used in the medium- and high-voltage sector and has two spaced-apart power supply connections (2, 3) and an active part (1). The active part comprises a fusible, current-carrying fuse element and an arc-extinguishing medium. The fuse element is connected in an electrically conducting manner to the two power supply connections and is arranged on an electrically insulating substrate. It is of a modular construction and has at least two modules (9) connected in series. The arc-extinguishing medium covers the exposed surfaces of the fuse element. The active part is formed in the manner of a sandwich and has two stable moldings (4, 5) and a predominantly planar intermediate layer (6) arranged between the moldings (4, 5). The intermediate layer (6) contains at least the two series-connected modules, whereas a first molding (4) of the two moldings is formed at least by part of the electrically insulating substrate and the second molding (5) is formed at least by part of the arc-extinguishing medium.

Abstract: A Full-Range fuse element assembly includes an insulative former having opposite first and second ends and electrically conducting connectors coupled to ends of the former. A plurality of fuse elements extend between the first connector and the second connector about the insulative former, and each of the fuse elements include a low current interrupting fuse element portion extending from the first connector and a high current limiting fuse element portion extending from the second connector. An insulative sleeve surrounds each of the low current interrupting fuse element portions, and each sleeve includes an end adjacent a respective one of the high current limiting fuse element portions. Each of the low current interrupting fuse element portions includes a weak spot located proximate the second end of a respective one of the sleeves.

Abstract: A Full-Range fuse element assembly includes an insulative former having opposite first and second ends and electrically conducting connectors coupled to ends of the former. A plurality of fuse elements extend between the first connector and the second connector about the insulative former, and each of the fuse elements include a low current interrupting fuse element portion extending from the first connector and a high current limiting fuse element portion extending from the second connector. An insulative sleeve surrounds each of the low current interrupting fuse element portions, and each sleeve includes an end adjacent a respective one of the high current limiting fuse element portions. Each of the low current interrupting fuse element portions includes a weak spot located proximate the second end of a respective one of the sleeves.

Abstract: A fuse for providing a connection between a multiple-source power supply having a plurality of cells and a power receiving device, includes a plurality of separate terminal leads, a common connector region, and a plurality of fuse links fabricated from a first conductive material and interconnecting a respective one of the terminal leads to the common connector region. At least a portion of at least one of the fuse links includes an overlay of a second conductive material that is different from the first conductive material from which the fuse link is fabricated. The second conductive material of the overlay has a lower melting temperature than does the first conductive material of the fuse link to lower the operating temperature of the fuse link.

Abstract: A high-current fuse for vehicles is provided. This high-current fuse includes a conductive plate having a fuse and terminal connecting portions on both ends, and a resin case into which the conductive plate is insert-molded. A heat radiating portion for releasing heat generated from the fuse and the conductive plate when energized is provided on the outer surface of the resin case. The heat radiating portion is made up of a plurality of thin plates arranged on the resin case at regular intervals. The thin plates are situated in parallel with the energizing direction so as to strengthen the resin case. To keep the fuse away from both ends of the conductive plate, a pair of assisting plates facing to each other are formed in the middle of the conductive plate, and the fuse is disposed between the assisting plates. The fuse between the assisting plates is in the direction perpendicular to the energizing direction of the conductive plate.

Abstract: A fuse includes a tube, a pair of blade terminals projecting from opposite ends of the tube, at least one fuse element disposed in the tube and electrically coupled between the terminals, and a pair of metallic end caps disposed on opposite ends of the tube. Electrically insulative elements are disposed between the end caps and the terminals. The tube is filled with an arc-quenching material inserted through a fill hole that is plugged by a plastic drive rivet. Each terminal is attached to a metallic end plate by means of a staking tang inserted into a slot of the end plate, and by means of a separate solder joint. Each insulative element includes an axial sleeve through which a respective terminal extends for a part of its length. The fuse element comprises a one-piece metal element bent to form a pair of parallel, superimposed strips divided into sections by means of fusible weak points.

Abstract: An insulation plate (20) is provided with a window or a slot (21). A fusible element or circuit (31) is laid on a surface of the insulation plate (20) across the window (21). When the circuit (31) is heated by current-conduction, a fusible path (33) of the circuit (31) spanned in air across the window (21) melts at a predetermined current level, since heat generated in the fusible path (31) is not absorbed in the insulation plate (20). It is possible to transform the plate fuse depending on the conditions of use, and its configuration is substantially flexible.

Abstract: A current protector comprising an organic resin-made insulating substrate, a pair of terminals formed at both ends of the insulating substrate, and an electrical conductor electrically connecting the terminals and having a thickness of 3-8 .mu.m and formed in or on the insulating substrate, is excellent in suppressing ignition and smoking at the time of blowing, and can be improved in clearing characteristics by various modifications.

Abstract: The present invention provides a method and apparatus for high yield improvements in programmable logic devices using redundancy. The present invention concerns a programmable logic device comprising a plurality of routings lines coupled to a plurality of logic blocks when programmed. During programming, a path is routed through the routing lines by programming the selected programmable elements. The selected programmable elements are located at each interconnect point between at least two routing lines or two segments of a routing lines along the path. The programmable elements include at least two interconnect circuits coupled in parallel. The programmable element is successfully programmed when at least one of the interconnect circuits is functional after programming.

Abstract: A fuse includes a tube, a pair of blade terminals projecting from opposite ends of the tube, at least one fuse element disposed in the tube and electrically coupled between the terminals, and a pair of metallic end caps disposed on opposite ends of the tube. Electrically insulative elements are disposed between the end caps and the terminals. The tube is filled with an arc-quenching material inserted through a fill hole that is plugged by a plastic drive rivet. Each terminal is attached to a metallic end plate by means of a staking tang inserted into a slot of the end plate, and by means of a separate solder joint. Each insulative element includes an axial sleeve through which a respective terminal extends for a part of its length. The fuse element comprises a one-piece metal element bent to form a pair of parallel, superimposed strips divided into sections by means of fusible weak points.

Abstract: An overload current protection arrangement is composed of a thin metallization that is applied onto a carrier foil. The metallization preferably is contacted by schoopage layers. The metallization can be constructed as a layered stack of metallized carrier foils.

Abstract: A fuse combination in which a group of fused elements are placed on an insulative support. The support is bent into a U-shape carrying the fuse elements with it. Contacts at the ends of the fuse elements extend beyond the corresponding edges of the support and are adapted to be inserted into a socket. To make the combination, the fuse elements are stamped out of a metal plate which has a thin central section. This thin section becomes the fusible portions of the fuse elements. A band at either end of the fuse elements connects them so that they can be handled as a unit. They are then placed on the support, secured thereto, and a preferably transparent cover is placed over the fusible portions.

Abstract: A board fuse includes an insulating board having a through-hole window in the middle of the insulating board and fusible elements laid over the insulating board. Further, the fusible elements are continuous metal wires substantially equal in cross section. The fusible elements are uniform and accurate in cross section and accurate in current capacity. The fusible elements extend across the window in such a manner that, at the window, they are not in contact with the insulating board. Hence, when heat is generated in any one of the fusible elements by electric current, the heat generated at the window is not absorbed by the insulating board and is increased as required, thus blowing the fusible element accurately. Accordingly, the board fuse is free from the difficulties caused by the heat generation, that is, the production of a bad smell, at worst the production of white smoke.

Abstract: A card-type connector, for use in cooperation with a socket, comprising an insulation board provided with grooves on its first and second faces. Electrical conductors are in the grooves and extend onto the first and second faces, bending around a first end of the board. A cover protecting a second end of the board, spaced apart from the first, includes the ends of the electrical conductors on each of the faces. When the connector is inserted into the socket with its second end leading, the electrical terminals of the socket first ride on the cover, and then contact the electrical conductors, thereby avoiding the peeling off or movement of the conductors resulting from the insertion. The connector may include a second cover between the first and second ends of the board and a cap at the first end. Preferably, the electrical conductors are fusible cut-out elements.

Abstract: The fuse link includes a first and second interconnect, with interconnects each being substantially longer than deep. The interconnects are disposed toward each other with a insulator region between them. A fusible conductor, spanning the insulator region, is attached at the top of the interconnects. The present device allows the length of the fusible conductor to be shortened, and results in a fuse link that can be consistently blown with a single laser pulse. Additionally, the fuse link can be used in a staggered layout. The staggered layout of parallel fuse links allows a high number of links in a relatively small area, with or without the use of tungsten barriers, and allows accessing all fuse links through a single fuse blow window.

Abstract: A thick film fuse assembly for high voltage, high amperage, high reliability applications. In a first embodiment the fuse assembly consists of an insulative substrate on which a parallel array of low mass thick film fusible elements are disposed. Thick film contact pads permit attachment of lead wires in electrical contact with the fusible elements. The fusible array is covered with a coating of arc suppressant glass. In a second embodiment of the fuse assembly, the fusible elements comprise thick film end portions and upstanding conductive wires which are positioned above and away from the insulative substrate. The arc suppressant glass surrounds each of the upstanding wires which permits higher amperage capacity.

Abstract: A current-limiting dropout fuseholder includes multiple current paths through the fuse body. A primary current path includes a high current fusible element. A secondary current path in parallel with the primary path includes a triggering conductor that extends outside the fuse body and is connected to a moveable support. The second current path further includes a first spark gap for severing the triggering conductor upon the occurrence of a fault and the shifting of the fault current from the primary current path to the second current path. A second spark gap formed between the primary and the second current paths ensures that the fault current flows across the first spark gap for a time sufficient to sever the triggering conductor, thereby ensuring that dropout will occur.

Abstract: A time-delay fuse (10) having parallel fusible element (22). The fuse element (22) is connected to a trigger mechanism (30) by solder or other meltable alloy. The trigger section (30) provides overload protection and the parallel fuse element (22) provide short circuit protection resulting in a time-delay fuse which can be used in places where there are size restrictions.

Abstract: A fuse for use in a high-voltage circuit which has a first fusible element through which most of a current in the fuse flows in a normal state of the fuse and which further breaks into two pieces when overcurrent flows therethrough and further has a second fusible element provided around the first fusible element and adapted to burn in response to the overcurrent for further melting to remaining pieces of the first fusible element in such a manner as to enlarge the distance between the remaining pieces of the first fusible element to an extent sufficient to prevent occurence of a surplus arc therebetween. Further, material of material the first fusible element has a smaller electrical resistance, a larger cross-sectional area and a lower melting point than that of the second fusible element.

Abstract: An improved current-limiting section is provided for an interrupting device. A main-current-path section of the interrupting device carries substantially all of the normal, load current while only a negligible portion of the current flows through a higher-impedance current-limiting section. Upon operation of the interrupting device, the contacts of a switch in the main-current section are rapidly separated to create one or more gaps. Upon the creation of the one or more gaps, the current is transferred into the current-limiting section. The current-limiting section includes a plurality of fusible elements. The fusible elements are thin, elongated, conductive ribbons.

Abstract: A time delay fuse (10) includes a tubular housing (12) of insulative material with first and second open ends (14, 16). First and second metallic or electrically conductive ferrules (18, 20) are mounted on the first and second ends, respectively, of the tubular housing. A core (24) is positioned within the tubular housing (12) and affixed to the ferrules (18, 20) by electrically conductive material (26) such as solder. At least one short inner wire (28) extends along the core and is electrically and mechanically connected to the solder (26). A second wire (34) longer than the first wire (28) is spirally wound around the core (24) and the first inner wire (28). The second wire (34) includes first and second ends (36, 38) mechanically and electrically connected to the conductive material (26) such that the first and second wires are electrically parallel.

Abstract: A slow blow fuse of the shunt type includes a pair of spaced terminals between which is connected and suspended a fuse wire assembly including a core of insulating material having at least a pair of fuse filaments upon the same, the outer of which is preferably an untinned spirally wound filament wrapped a number of times around one and more preferably at least two straight filaments, only one of which is tin plated, extending axially along the core. The uncoated spirally wound filament thus makes repeated physical and axial spaced electrical contact with the tinned filament. There are thus at least two fuse filaments in electrical parallel relation at a number of different locations therealong, each sharing a layer of tin coating.

Abstract: A slow-blow electrical fuse structure features one or more conducting fuse links for high-current blow-out protection and located in individual chambers filled with arc-quenching filler and in thermal contact with a spring-loaded piston-and-guide structure soldered into an extended position and similarly soldered to one of the fuse links by an extension leading through a chamber-separating insulating partition washer. At overload the heat from the fuse links melts the aforementioned soldered junctions, causing the spring to collapse the piston over the guide, simultaneously withdrawing it from the chamber, thereby breaking the circuit. A similar chamber-defining washer is captively affixed to the opposite end of the piston-and-guide assembly affixed to the optional second fuse link, both partition-forming washers being rotatingly captively secured to the ends of the piston-and-guide assembly by specially configured apertures therein.

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 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: 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: A time delay fuse includes a tubular housing of insulative material with first and second open ends. First and second metallic or electrically conductive ferrules are mounted on the first and second ends, respectively, of the tubular housing. A core is positioned within the tubular housing and affixed to the ferrules by electrically conductive material such as solder. At least one short inner wire extends along the core and is electrically and mechanically connected to the solder. A second wire, longer than the first wire, is spirally wound around the core and the first inner wire. The second wire includes first and second ends mechanically and electrically connected to the conductive material such that the first and second wires are electrically parallel.

Abstract: An electrical fuse wherein one or more portions of the fuse element are provided with two adjacent parallel weak spots separated by dielectric material or air gap, and arranged such that the direction of current flow in one of the adjacent weak spots is opposite that in the other adjacent weak spot, such that a magnetic field is generated which produces a separating force between the two weak spots. Arcs formed during the fusing of the weak spots are forced apart by the generated magnetic field thus increasing the arcs path lengths which increases arc voltage thereby forcing arc current to zero.

Abstract: A time delay fuse is disclosed which does not require stored energy devices or separated chamber construction, and is dependent on the mass of the low melting point material and metal connector blocks to absorb heat on short duration overloads. The time delay fuse includes one or more fusible links having a combination of relatively high melting point material and a relatively low melting point mass enabling short circuit protection at a multiple of rated current and sustained overload protection at values above rated current. The number of fuse links used in the fuse is directly related to the intended current rating for the total fuse but may be from one to at least 15 links.

Abstract: A fused electrical plug assembly is provided having a plug body with a fuse socket open to one side to hold a push-in fuse unit. The fuse unit has one pair of active fuse elements between which there is a spare pair which can be used by removing the fuse unit, turning it ninety degrees and pushing it back into the fuse socket.

Abstract: A fused plug has a fuse cavity containing active and spare fuses which can be alternated between active and inactive positions. The fuses in turn preferably each have multiple fuse elements which can be alternatively placed in active position by changing the position of the fuse in the fuse cavity.

Abstract: The invention involves new high voltage current limiting fuses employing composite metal fuse elements. One metal of the composite is aluminum which is of high conductivity and high melting point while the other is cadmium which is of low melting point, so that melting of the low melting point metal occurs at any and all locations along the element when its temperature reaches the said low melting point. The resulting composite exhibits properties that are not the mean of the metals employed and has a reversible resistance characteristic thus facilitating the design of the fuse for low current fault interruption.

Abstract: A fused electrical plug assembly is provided having a plug body with a fuse socket between projecting prongs, and a push-in fuse unit is received in the fuse socket. The fuse unit has a pair of active fuse elements on one side and a spare pair on another side which can be used by removing the fuse unit, turning it to properly orient the spare pair, and pushing it back into the fuse socket.