Utilizing Plural Fusible Elements Patents (Class 337/164)
  • Patent number: 10153123
    Abstract: An embodiment of a fuse module has been disclosed. The fuse module includes a housing and a fuse element assembly contained within the housing. The fuse element assembly includes at least one fuse element unit having a plurality of trigger mechanisms and a perforated strip electrically connected to the trigger mechanisms. Increased ampacity ratings in a more compact arrangement provides for fuse modules having increased current protection capability that, in turn, provides for improved disconnect switching capabilities.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: December 11, 2018
    Assignee: EATON INTELLIGENT POWER LIMITED
    Inventors: Advait Madhusudan Katarki, Patrick Alexander von zur Muehlen, Robert Stephen Douglass
  • Patent number: 10074501
    Abstract: An arc-mitigating fuse including a tubular fuse body, a first endcap covering a first end of the fuse body and a second endcap covering a second end of the fuse body, a fusible element disposed within the fuse body and extending between the first endcap and the second endcap to provide an electrically conductive pathway therebetween, and an arc-mitigating element disposed within the fuse body and held in a compressed state between the first endcap and the second endcap, the arc-mitigating element adapted to extend to an uncompressed state upon separation of the fusible element.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: September 11, 2018
    Assignee: Littelfuse, Inc.
    Inventor: Brian Johnson
  • Patent number: 9240300
    Abstract: The present invention discloses a device comprising a thermal fuse and a resistor, the solid ceramic base of the wirewound resistor is changed to be hollow, forming a ceramic tube; the thermal fuse is placed in the solid ceramic base, the ceramic tube provides housing for the thermal fuse; a lead wire of the thermal fuse passes through an end cap of an end of the wirewound resistor, the other end of the thermal fuse extends out of the end cap of the other end of the wirewound resistor, the end cap of the wirewound resistor extends outwardly with a lead wire, then an epoxy resin is used to encapsulate the device. The present invention can be used as a basic unit and directly installed in an existing high-frequency charger; it is capable of replacing the existing simple wirewound resistor or the wirewound resistor with an external contact type thermal fuse, and realizing triple functions of general impedance, over-current fuse protection, and over-temperature protection in case of overload.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: January 19, 2016
    Assignee: XIAMEN SET ELECTRONICS CO., LTD
    Inventors: Zhonghou Xu, Yousheng Xu, Xuanhui Zhu
  • Patent number: 9054368
    Abstract: The present disclosure discloses a current fuse device. The current fuse device comprises: an insulating box having a cavity; a first conductor fixed to the insulating box with a first outer end and a first inner end; a second conductor fixed to the insulating box with a second outer end and a second inner end; and at least one elastic member disposed on at least one of the first conductor and the second conductor and inside the cavity. The elastic member forms an electrical connection between the first inner end of the first conductor and the second inner end of the second conductor. The elastic member has an elastic potential energy to break the electrical connection when a short circuit occurs.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: June 9, 2015
    Assignee: BYD Company Limited
    Inventors: Zhiwei Tong, Jianhua Zhu, Weixin Zheng, Hao Hu
  • Patent number: 7969275
    Abstract: A fuse assembly includes a main component partially encased in a protective sheath. The main component includes a pair of connectors formed of an electrically conductive material to allow the fuse assembly to be electrically connected into an electric vehicle drive system. A fusible link is electrically connected between the connectors and is preferably encased in the protective sheath. The fusible link reacts to current flowing through the fuse assembly in excess of a predetermined current for a predetermined time, as is well known to those skilled in the art.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: June 28, 2011
    Assignee: EnerDel, Inc.
    Inventor: Chad Hartzog
  • Patent number: 7724122
    Abstract: A fuse including a fuse housing having first and second electrical terminals, a movable partition made from an electrically conductive material movably disposed within the fuse housing, a fusible structure connected between the first electrical terminal and the movable partition, a conductor connected between the movable partition and the second electrical terminal, a biasing element acting on the movable partition to maintain the fusible structure in tension and for moving the movable partition upon melting of the fusible structure and an indicator connected between the movable partition and the second electrical terminal.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: May 25, 2010
    Assignee: Thomas & Betts International, Inc.
    Inventor: John G. Leach
  • Publication number: 20080224814
    Abstract: The disclosed embodiments include a method of manufacturing and electrical assembly. The method includes forming a first electrical component at a first stamping machine. The method also includes forming a second electrical component at a second stamping machine. The method further includes forming a third electrical component at a third stamping machine and receiving the first, second and third electrical components at an assembly machine. The first, second and third electrical components are then assembled into a unitary electrical assembly.
    Type: Application
    Filed: March 13, 2007
    Publication date: September 18, 2008
    Applicant: LEAR CORPORATION
    Inventors: Slobadan Pavlovic, Mohamad Zeidan, Dave Menzies
  • Publication number: 20030210125
    Abstract: A fuse and filter arrangement having a polymer fuse apparatus that provides bypass fuse protection. A polymer bypass fuse includes of an electrical conductor wherein a portion of the conductor is surrounded by an internal electrode, which is then surrounded by a layer of polymeric positive temperature coefficient (PTC) material, which is then surrounded by a conductive material similar to that of the internal electrode.
    Type: Application
    Filed: February 18, 2003
    Publication date: November 13, 2003
    Applicant: X2Y Attenuators, LLC
    Inventor: Anthony A. Anthony
  • Patent number: 6646537
    Abstract: A single circuit element, referred to as a solid state rectifying fuse (SSRF), rectifies an incoming AC signal and opens the circuit if a programmed maximum current level is reached. The anode or cathode depending upon the particular application is designed with a plurality of conductors strips in electrical contact with the P or N region, respectively. Conductor strips are composed of a material that melts open if the current limit is exceeded. Conductor strips are designed to have a lower total current handling capacity than that of the PN junction so that the current is reduced or terminated before the PN junction can “short.” Depending on the desired maximum current of the SSRF, the current limit can be adjusted downward by burning out or severing some of the conductors. In this sense, it is a programmable diode.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: November 11, 2003
    Assignee: Ventur Research & Development Corp.
    Inventor: James W Gibboney, Jr.
  • Patent number: 6538551
    Abstract: A dual element fuse includes a first conductive fuse coupler portion and an overload fusing assembly coupled to the first conductive fuse coupler portion. The overload fusing assembly includes a barrel having a flange at one end thereof, a trigger received within said barrel and positioned in a pre-operated position by a fusing alloy, and a conductive coil surrounding the barrel predominately in an area adjacent the flange. The conductive coil is connected between the first conductive fuse coupler portion and the flange, thereby concentrating heat generated in the conductive coil toward the flange.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: March 25, 2003
    Assignee: Cooper Technologies Company
    Inventor: Michael C. Henricks
  • Patent number: 6476705
    Abstract: A voltage distribution device for use especially in motor vehicles, includes a first area (2) made of conductive material and fitted with at least one electrical connection (8), at least two separate second areas (3, 4) made of conductive material and fitted with at least one electrical connection each (7), and bridge-like fuse areas (5, 6) made of conductive material, which each link the second areas (3, 4) with the first (2) and are inseparably connected to the first and associated second area. The bridge-like fuse areas (5, 6) each have a cross-section of material calibrated along a longitudinal section according to material thickness and/or depth.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: November 5, 2002
    Assignees: Audio Ohm di Tonani Caterina ECS.N.C., Lisa Draxlmaier GmbH
    Inventors: Bruno Betti, Robert Neuhauser
  • Patent number: 6380837
    Abstract: A fuse assembly is provided having two fusible elements, electrically in parallel with each other, thereby providing the fuse assembly with increased inrush current withstand capacity, a greater range of current ratings and lower temperature rise at higher rated currents.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: April 30, 2002
    Assignee: San-O-Industrial Corporation
    Inventor: Carl E. Lindquist
  • Patent number: 5841338
    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.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: November 24, 1998
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventor: Jun Yasukuni
  • Patent number: 5528213
    Abstract: An embracing portion is formed on a fusible body of metal, and a chip of low-melting metal is embraced by this embracing portion, and a constricted portion of a small cross-sectional area is formed at the fusible body, and a radiating plate is provided in the vicinity of the constricted portion.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: June 18, 1996
    Assignee: Yazaki Corporation
    Inventors: Hiroki Kondo, Shigemitsu Inaba, Mitsuhiko Totsuka, Toshiharu Kudo
  • Patent number: 5298877
    Abstract: We provide an overload fuse link that is generally used in cartridge type fuses along with a short-circuit fuse link. The overload fuse link is prepared from a solder alloy and is directly attached to the interior of one of the cartridge fuse terminals. The overload fuse link has an open bore opening at one end and a connector extending from the other end. The cartridge fuse which uses the fuse link also has an insulator through which the connector passes and the insulator separates the short circuit fuse link from the body section of the overload fuse link wherein when there is an overload, the fuse link connector electrically separates from the fuse link body section.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: March 29, 1994
    Assignee: Cooper Industries, Inc.
    Inventors: Leon Gurevich, Edward Haworth
  • Patent number: 5254967
    Abstract: An electrical interruption device is disclosed in which a space efficient spiral spring activates current interruption. The spring is characterized by coils which wind continuously about and approach a central axis, with successive coils of the spring having reduced radius to pass axially through the center of an outwardly adjacent coil. The spring may further be made to assume a flat condition with the spring coils lying flat, nesting interposed between adjacent coils. Advantageously, the spiral spring is conical in shape and is tensioned in a reverse loaded configuration wherein the coils of one end of the spring are pulled axially inward, through and past the coils of other end. Preferably the reverse loaded conical spring forms part of a thermally sensitive device which includes a housing having disposed therein a plunger which is in a biased relationship with the spring.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: October 19, 1993
    Assignee: Nor-Am Electrical Limited
    Inventors: Tony Biasutti, Peter Morgan, Mary A. Ruggiero, Brian A. Young
  • Patent number: 5252942
    Abstract: A hollow electrical circuit protector preferably coated with an insulative coating which will maintain its structure and not be conductive when said circuit protector blows. The electrical circuit protector has at least one weak spot cross-sectional area and is generally adapted to be part of a dual element fuse link with ribbon-like fuse links on opposite sides thereof. Also provided are the ribbon like fuse links, one with a guide and the other with an integral washer.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: October 12, 1993
    Assignee: Cooper Industries, Inc.
    Inventor: Leon Gurevich
  • Patent number: 5247274
    Abstract: A time-delay fuse having a fuse element with a series of weak spots surrounded by a loose sand filler. The fuse element is connected to a trigger mechanism by solder or other meltable alloy. The trigger section provides overload protection and the fuse element provides short circuit protection resulting in a time-delay fuse which can be used in places where there are size restrictions.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: September 21, 1993
    Assignee: Cooper Industries, Inc.
    Inventor: Leon Gurevich
  • Patent number: 5239291
    Abstract: A dual element ferrule fuse includes a short circuit element and an overload element. The overload element includes a heater element which, in addition to carrying heat, is designed to partially enclose the overload element with tabs that provide a weldable surface between the element and the metallic end cap, thus eliminating the need for a separate washer. Additionally, the tabs serve to center the element in the end cap and retain the element at a certain point in the fuse body between assembly of the fuse and soldering of the cap to the weldable surface.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: August 24, 1993
    Assignee: Cooper Industries, Inc.
    Inventors: Michael C. Henricks, Robert S. Douglass
  • Patent number: 5150093
    Abstract: A time-delay fuse having a fuse element with a series of weak spots surrounded by a loose sand filler. The fuse element is connected to a trigger mechanism by solder or other meltable alloy. The trigger section provides overload protection and the fuse element provides short circuit protection resulting in a time-delay fuse which can be used in places where there are size restrictions.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: September 22, 1992
    Assignee: Cooper Industries, Inc.
    Inventor: Leon Gurevich
  • Patent number: 5077534
    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.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: December 31, 1991
    Assignee: Cooper Industries, Inc.
    Inventor: Robert S. Douglass
  • Patent number: 5075664
    Abstract: A trigger for a dual element time delay fuse includes a paper cap and a heater strip having locating ears thereon.
    Type: Grant
    Filed: September 12, 1989
    Date of Patent: December 24, 1991
    Assignee: Cooper Industries, Inc.
    Inventors: Keith A. Spalding, Fred Levko
  • Patent number: 4992770
    Abstract: The dual element time delay fuse includes a circuit overload trigger which opens the fuse in response to long term medium circuit overloads, and a short circuit strip disposed in a solid matrix filler for opening the fuse in response to the presence of a short circuit in the circuit.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: February 12, 1991
    Assignee: Cooper Industries, Inc.
    Inventors: Keith A. Spalding, Fred Levko, Donald Johnston, John Ackermann, Arlie Ehlman
  • Patent number: 4973932
    Abstract: A fuse comprises a housing filled with arc-quenching material, terminals at the opposite ends of said housing, and a fuse element assembly in the housing connected between the terminals. The fuse element assembly has at least one short circuit blowing section and a center-melting slow blowing section, both disposed within an unpartitioned space in the housing, so that the entire body of arc-quenching material affects the short circuit blowing section of the fuse. The slow blowing fuse section has a surrounding layer of thermoplastic material which prevents the oxidation thereof and becomes plastic at the melting temperature of the time delay element. During the fuse element melting attendant to blowout, plastic deformation allows necessary geometric change in fuse element shape and facilitates collapse of the slow blowing fuse section.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: November 27, 1990
    Assignee: Littelfuse, Inc.
    Inventors: David J. Krueger, Robert G. Swensen
  • Patent number: 4888573
    Abstract: A dual element cylindrical line fuse includes an insulating assembly disposed midway along an insulating tube. A metal eyelet having a barrel with a closed end is disposed through the assembly and retains an electrically conductive coil in place around the insulator assembly. A pair of heater strips extend between the ends of the coil and conductive end caps disposed on the ends of the tube.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: December 19, 1989
    Assignee: Cooper Industries, Inc.
    Inventor: Glen A. Dunn
  • Patent number: 4873604
    Abstract: A shunt device and a method are described for protecting electrical equipment when a fuse blows. The shunt device establishes a by-pass across the fuse for permitting a limited amount of current to begin to flow at a lower voltage than the fuse blowing voltage and before the fuse blows, thereby serving as a transitory relief valve for a portion of the current while minimizing or even substantially eliminating the inductive spike when the fuse blows. The shunt device is made of at least one pyrolyzed polyacrylonitrile (PPP) fiber having a selected switching voltage so that the PPP fiber switches to a low resistance state while the fuse is blowing. When the fuse and PPP characteristics are properly matched, the rate of change of the current with time is lowered, thus selectively decreasing the size of the voltage transients which occur after the fuse blows.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: October 10, 1989
    Assignee: Hoechst Celanese Corp.
    Inventors: Harris A. Goldberg, Clyde C. Williams
  • Patent number: 4736180
    Abstract: A core assembly having a flexible insulating material core and a spirally wound inner fuse wire engages with one or more elongate bodies of the flexible insulating material to sandwich and compress the inner fuse wire therebetween. An arc burning between the blown ends of the inner fuse wire will be blocked and quenched by the core and body insulating materials expanding or moving into the space where the arc subsists and is burning away a portion of the inner fuse wire. An outer fuse wire, an outer wrapper of shrinkable tubing or twisting together the core assembly and the elongated body or bodies retains the core assembly and insulating body or bodies engaged along their length and forms a fuse wire assembly.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: April 5, 1988
    Assignee: Littelfuse, Inc.
    Inventor: Seibang Oh
  • Patent number: 4703300
    Abstract: A composite time lag fuse having an insulating housing enclosing a time delay fuse and an electrical resistance heater which is located in intimate heat transfer relationship with the time delay fuse. The time delay fuse and electrical resistance heater being connected in a series circuit between a pair of conductive end caps closing the ends of the insulating housing. An overload current flow in the electrical resistance heater resulting in the generation and transfer of heat from the electrical resistance heater to the time delay fuse to cause the time delay fuse to interrupt after a predetermined time delay, an overload current flow in the circuit to be interrupted, which is of a lesser magnitude than would otherwise be interrupted by the time delay fuse. For improved short circuit performance, a short circuit fuse is also enclosed in the insulating housing and is connected in the series circuit.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: October 27, 1987
    Assignee: Cooper Industries, Inc.
    Inventor: Aldino J. Gaia
  • Patent number: 4680567
    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.
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: July 14, 1987
    Assignee: Cooper Industries, Inc.
    Inventor: Carl H. Edwards
  • Patent number: 4593262
    Abstract: A fuse (12) for protecting a circuit and comprising a tube (14) of insulating material having an inner wall surface (16) and an outer wall surface (18) so as to form a fuse housing. The fuse includes two opposite axial ends (20) and (22), and a first (24) and a second conductive fuse terminal (26) are secured to the tube adjacent each of those opposite axial ends, respectively. Serially-located elements (28) are disposed within the fuse housing and provide electrical continuity between the first fuse terminal and the second fuse terminal. The elements comprise stressed spring means (30) and resistor means (32), with the spring means having a proximate end (40) secured to the fuse adjacent the first fuse terminal and a distal end (41) secured through a meltable junction (34) to the resistor means.
    Type: Grant
    Filed: March 22, 1985
    Date of Patent: June 3, 1986
    Assignee: Littelfuse, Inc.
    Inventor: David J. Krueger
  • Patent number: 4562420
    Abstract: A time delay fuse comprises an initially open end insulating housing having conductive terminals at the opposite ends thereof, a current-heatable strip connected to one of said terminals, a thermal mass in heat communication with the current-heatable strip and a coil spring and current shunt strip electrically coupled between the current-heatable strip and the other terminal to complete a circuit between the terminals. A heat meltable solder connection is located between said thermal mass and the coil spring and current shunt strip, the spring and current shunt strip being spring urged away from the thermal mass so that upon the melting of the heat meltable solder connection the coil spring and current shunt strip will be pulled away from the thermal mass to break the physical and electrical connection of the coil spring and current shunt strip with the current-heatable strip.
    Type: Grant
    Filed: April 13, 1984
    Date of Patent: December 31, 1985
    Assignee: Littelfuse, Inc.
    Inventors: Joseph W. Kowalik, David J. Krueger
  • Patent number: 4560971
    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.
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: December 24, 1985
    Assignee: Littelfuse, Inc.
    Inventor: Seibang Oh
  • Patent number: 4523172
    Abstract: A high voltage quick-break fuse has at least one silver fuse element and at least one tin fuse element in series connection. It is a full-range fuse dimensioned in such a way that, even in the case of critical overcurrents where hitherto fuses have had a tendency to explode, the in each case appropriate fuse element system comes into action, before the fuse can explode as a result of the rising internal pressure. Further developments relate to the housing of particularly thin silicone sleeves, supported by a fabric, in fuse tubes according to the DIN standard.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: June 11, 1985
    Assignee: Wickmann Werke GmbH
    Inventors: Michael Drothen, Willi Ressel
  • Patent number: 4517544
    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.
    Type: Grant
    Filed: October 24, 1983
    Date of Patent: May 14, 1985
    Assignee: McGraw-Edison Company
    Inventor: Vernon R. Spaunhorst
  • Patent number: 4417224
    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.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: November 22, 1983
    Assignee: Federal Pacific Electric Co.
    Inventor: Michael E. Ross
  • Patent number: 4263574
    Abstract: A strip-shaped fusible member is disposed in a slit formed in an electrically insulating member to be not greater than 1 mm in width. Further a granulated electrically insulating material may be charged around the electrically insulating member within an enclosed housing. Alternatively, a plurality of electrically insulating members may alternate in intimate contact relationship fusible member to form a stack. Each fusible member is connected at both ends to two terminal blocks located on the opposite sides of the stack on those portions higher in level than that portion thereof sandwiched between the insulating members while its end portions are slackened.
    Type: Grant
    Filed: August 29, 1978
    Date of Patent: April 21, 1981
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Teijiro Mori, Yuichi Wada, Suenobu Hamano
  • Patent number: 4146861
    Abstract: A novel fuse arrangement for electrical and electronic circuits is provided having shorter arcing time and arc-extinguishing time as compared to the prior art fuses. The fuse arrangement described herein comprises a pair of electrodes having contact terminals for connection to the circuit and a support member preferably disposed triangularly relative to the electrodes. In one embodiment, a fusible wire elment is stretched between the electrodes and has its mid portion supported by the support member. The support member is made from a material of large heat capacity and high thermal conductivity to provide a heat dissipating surface for the heat generated in the fusible wire element.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: March 27, 1979
    Assignee: San-O Industrial Corp.
    Inventors: Hiroo Arikawa, Akira Taniguchi, Masaya Maruo
  • Patent number: 4058784
    Abstract: A circuit-interrupting device has a stationary current-conducting member, a movable current-conducting member, a connector which accommodates the adjacent ends of the current-conducting members and which normally holds a mass of heat-softenable alloy in engagement with those adjacent ends, an indicator which is connected to the movable current-conducting member and a spring which can simultaneously move the movable current-conducting member, and the indicator to moved positions whenever the circuit-interrupting device opens the circuit. The adjacent ends of the current-conducting members extend into the connector a distance less than one-half of the minimum distance through which the spring will move the indicator.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: November 15, 1977
    Assignee: McGraw-Edison Company
    Inventor: Aldino J. Gaia
  • Patent number: 4057774
    Abstract: A time-delay fuse is provided comprising a glass or ceramic tube sealed at both ends with sealing means such as, e.g., ferrules. An elongated generally cylindrical core member, made from a highly heat conductive material (a sintered blend of aluminum oxide and magnesium oxide spinel), is diagonally disposed in said tube and rigidly fixed at both ends in intimate contact with said sealing means. The fuse also comprises a wire strand spirally wound on said elongated core member. The wire strand is made by winding a first metallic wire element over a second mutually fusible wire element and is soldered at both ends with a high melting solder element.
    Type: Grant
    Filed: April 16, 1976
    Date of Patent: November 8, 1977
    Inventors: Hiroo Arikawa, Fumitake Akiyama, Masaya Maruo
  • Patent number: 4053862
    Abstract: A fuse-element for use in an electric network, includes a metal strip including at least one portion having a reduced cross-section, a shunt element of conductive material shunting the portion, bonding means conductively bonding the shunt element to the metal strip and being capable of being released at a temperature higher than a predetermined temperature, the shunt element defining a chamber facing towards the metal strip and being sealed by the bonding means between the metal strip and the shunt element, and a material disposed in the chamber having a boiling temperature below the predetermined temperature and capable of producing an internal gas pressure within the chamber sufficient to break the bond when the material is heated to a temperature higher than the boiling temperature.
    Type: Grant
    Filed: February 5, 1976
    Date of Patent: October 11, 1977
    Assignee: Villamos Berendezes es Keszulek Muvek
    Inventors: Tibor Csizy, Arpad Karpat, Janos Melis
  • Patent number: 4053860
    Abstract: An electric fuse suitable for motor-starting, i.e. having a considerable time-lag in the range of motor starting currents, and at the same time having a current-limiting action in the high fault current range, characterized by extremely small peak let-through currents and extremely small clearing I.sup.2.multidot. t values. To be more specific, fuses emboyding this invention have considerably smaller maximum peak let-through currents and considerably lower clearing I.sup.2.multidot. t values than Underwriter Laboratories Class RK5 fuses, and meet the maximum acceptable peak let-through current values and clearing I.sup.2.multidot. t values of Underwriter Laboratories Class RK1 fuses. This is achieved by combining specific time-lag means involving a minimum of mass with parallel current paths of greatly increased number and greatly decreased size.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: October 11, 1977
    Assignee: Gould, Inc.
    Inventors: Frederick J. Kozacka, Richard A. Belcher
  • Patent number: 4032877
    Abstract: A heat-sensitive protector, that is connectable into an electric circuit, has an elongated, effectively non-fusing element which performs the function of a connector as long as that protector is intact, and thereafter moves fron a retracted position to an extended position to perform the function of an indicator when that protector responds to heat to open that circuit. That element spans the full distance between the terminals of that heat-sensitive protector.
    Type: Grant
    Filed: May 3, 1976
    Date of Patent: June 28, 1977
    Assignee: McGraw-Edison Company
    Inventor: Craig L. McAlister, deceased