EP0518510B1 - Electrical fuses - Google Patents
Electrical fuses Download PDFInfo
- Publication number
- EP0518510B1 EP0518510B1 EP19920304672 EP92304672A EP0518510B1 EP 0518510 B1 EP0518510 B1 EP 0518510B1 EP 19920304672 EP19920304672 EP 19920304672 EP 92304672 A EP92304672 A EP 92304672A EP 0518510 B1 EP0518510 B1 EP 0518510B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- end caps
- solder
- tubular housing
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000679 solder Inorganic materials 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 21
- 238000003466 welding Methods 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/143—Electrical contacts; Fastening fusible members to such contacts
- H01H85/157—Ferrule-end contacts
Definitions
- the present invention relates to miniature electrical fuses and more particularly to such fuses in which the fusible element is located within a tubular housing of an insulating material and connected between electrically conducting end caps which close off the opposite ends of the tubular housing and have electrical lead wires connected thereto to permit the fuse to be connected into a circuit without use of a fuse holder.
- the invention is particularly concerned with problems arising from securing the electrical wires to the end caps in miniature fuses.
- the lead wires are generally welded or staked to external or secondary caps which are pushed on over the main end caps after manufacture of the main body of the fuse. This is because attempts to resistance weld lead wires directly to the main end caps give rise to a number of problems. Particular problems which occur are weakness of the lead attachment; distortion of the fusible element during welding which causes variation in the blowing characteristics of the fuse or loss of breaking capacity; and furthermore movement of solder fluidised during the welding process causes globules or streamers of solder to enter the fuse housing and affect the fuse performance.
- W090/00305 on which the preambles of claims 1 and 6 are based, describes a microfuse comprising a fusible element bonded to a ceramic chip.
- the chip is contained within a tubular insulating enclosure having end caps to which the respective ends of the fusible element are coupled with solder. The solder also secures the ceramic chip to the end caps. Lead wires are attached to respective end caps.
- a method of manufacturing a miniature electrical fuse having a fusible element located within a tubular housing made of insulating material, the element being connected between electrically conducting end caps which close off the opposite ends of the housing, and the end caps having electrical lead wires connected thereto to permit the fuse to be connected into a circuit without use of a fuse holder comprising the step of forming a sub-assembly by uniting the ends of the tubular housing and the fusible element to respective end caps of the tubular housing with a solder joint, characterised in that during said forming step an axial force is maintained on each end cap to urge each end cap into direct mechanical contact with the pertaining end face of the housing so that solder alloy is substantially absent from the site of said direct mechanical contact and in that, subsequent to the solder alloy having solidified, the method comprises the further step of simultaneously resistance welding the lead wires directly to respective end caps of the sub-assembly using opposed thrust forces which are transmitted through the said direct mechanical contacts to
- the end caps are selected to have comparatively thick base portions and thin side walls, the thickness ratio being within the range 1.3 to 1 and 2.1 to 1, and the solder alloy is selected to have a comparatively high melting point, in excess of 180°C, whereby the sub-assembly is sufficiently robust to withstand the forces involved in the resistance welding process, the side walls of the end caps are sufficiently thin and elastic not to damage the housing when they contract in the solder cooling phase after the caps are soldered to the housing, the solder alloy is of sufficiently high melting point to prevent displacement of the fusible element or the solder joints of the sub-assembly during the resistance welding process, and the end faces of the housing are accurately plane parallel and orthogonal to the axis of the housing.
- a miniature electrical fuse comprising a fusible element located within a tubular housing made of insulating material and connected between electrically conducting end caps which close off the opposite ends of the housing, the ends of the tubular housing and the fusible element being united to respective end caps by solder joints, and a pair of electrical lead wire secured to respective end caps, characterised in that the electrical lead wires are secured to respective end caps by resistance welded joints, the thickness of that part of the base of each end cap to which a lead wire is secured being greater than the thickness of the side wall of the cap in a ratio between 1.3 to 1 and 2.1 to 1, and in that the end caps are in direct mechanical contact with respective pertaining end faces of the tubular housing so that solder alloy is substantially absent from the sites of mechanical contact.
- a fusible element comprising a helical wire 1 wound on an insulating support 2 is axially located in a cylindrical tubular glass housing 3 whose ends are closed off by electrically conducting metal end caps 4.
- the housing 3 could alternatively be made of ceramic or a filled plastic material and fusible element 1 could alternatively be a slant wire, an axial wire, or other element design known in the art.
- the housing 3 may be filled with a suitable material e.g. quartz grains, ceramic particles, ceramic wool, ceramic cloth, ceramic paper, polymer granules, inorganic or organic materials intended to release arc-quenching substances when heated, or solid matrix ceramic materials.
- the ends of the tubular housing 3 are made accurately plane parallel and perpendicular to the axis of the housing so that when the solder initially located within each end cap 4 is melted and the end cap is pushed on to the housing 3 during the assembly of the fuse, direct mechanical contact is achieved between the end cap and the end faces of the housing as shown at 5.
- this accuracy of the tube end faces can be achieved by setting with a diamond wheel.
- this can be achieved by end grinding after firing.
- a flux is used initially to melt the solder into the caps 4 prior to assembly of the fuse, but after solder solidification and prior to such assembly the flux is removed by immersion in a solvent. This ensures that the assembled fuse has a solid metal joint between the end cap and the end faces of the tubular housing, without enclosures of solidified flux. Such enclosures of flux can lead to distortion of the fuse during the subsequent resistance welding process as the enclosures soften at comparatively low temperatures.
- solder joint between the housing 3 and the side wall of the end caps is shown at 6 and the solder joint to the fuse wire is shown at 7. Solder is substantially squeezed out from and therefore is effectively absent from the site 5 of direct mechanical contact between housing 3 and end caps 4.
- the solder is selected to have a comparatively high melting point (for example 180°C or greater) and preferably is an alloy of lead in the range 77-90% and tin in the range 23%-10%.
- a comparatively high melting point for example 180°C or greater
- the solder is selected to have a comparatively high melting point (for example 180°C or greater) and preferably is an alloy of lead in the range 77-90% and tin in the range 23%-10%.
- One particular alloy which is suitable is 85% lead and 15% tin.
- Other alloys containing tin, lead, possibly with antimony and silver in varying proportions, may also be utilised.
- each end cap 4 is thicker than the side wall of the cap within the ratio 1.3 to I and 2.1 to 1.
- the thick base of the end caps is provided to withstand the subsequent resistance welding process whereas the side wall of the end caps is comparatively thin and elastic so that during the solder cooling process the contraction of the side wall and solder joint 6 does not lead to excessive forces on the frangible side walls of the housing 3.
- the thickness of the base of each end cap is typically 0.5 to 0.72mm and the side wall thickness is typically 0.3 to 0.45mm.
- the lead wires may be between 0.4 and 1.0mm in diameter and made of tin plated copper or tin plated copper clad steel.
- a clamp type electrode is simultaneously fitted to the side wall of each end cap 4 and each lead wire 8 is gripped by an electrode and urged axially into engagement with the pertaining end cap to form the welds 9.
- the opposing axial forces from both lead wires 8 are transmitted by the comparatively thick end walls of the end caps 4 and their circumferential abutment with the end faces of the housing 3 to the housing itself.
- the thermal effects of the resistance welding process are greatest at the outermost surface of the end walls of the end caps 4 where the welds 9 are formed.
- the lead wires 8 are therefore simultaneously fitted directly to the end caps 4 without disturbing the pre-assembled main portion of the fuse.
- each end cap to which the lead wire 8 is attached may be of increased thickness as indicated by the broken line configuration, 4a.
- the central portion to which the lead wire is welded may be of thickness between 0.5 and 1.0mm.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuses (AREA)
Description
- The present invention relates to miniature electrical fuses and more particularly to such fuses in which the fusible element is located within a tubular housing of an insulating material and connected between electrically conducting end caps which close off the opposite ends of the tubular housing and have electrical lead wires connected thereto to permit the fuse to be connected into a circuit without use of a fuse holder.
- The invention is particularly concerned with problems arising from securing the electrical wires to the end caps in miniature fuses.
- In known constructions the lead wires are generally welded or staked to external or secondary caps which are pushed on over the main end caps after manufacture of the main body of the fuse. This is because attempts to resistance weld lead wires directly to the main end caps give rise to a number of problems. Particular problems which occur are weakness of the lead attachment; distortion of the fusible element during welding which causes variation in the blowing characteristics of the fuse or loss of breaking capacity; and furthermore movement of solder fluidised during the welding process causes globules or streamers of solder to enter the fuse housing and affect the fuse performance.
- W090/00305, on which the preambles of
claims 1 and 6 are based, describes a microfuse comprising a fusible element bonded to a ceramic chip. The chip is contained within a tubular insulating enclosure having end caps to which the respective ends of the fusible element are coupled with solder. The solder also secures the ceramic chip to the end caps. Lead wires are attached to respective end caps. - It is an object of the present invention to provide a fuse construction and method of manufacture which is sufficiently robust to withstand the forces and thermal effects involved in resistance welding axial lead wires directly to the end caps of a fuse and on which the aforementioned problems are substantially reduced or avoided.
- According to a first aspect of the present invention there is provided a method of manufacturing a miniature electrical fuse having a fusible element located within a tubular housing made of insulating material, the element being connected between electrically conducting end caps which close off the opposite ends of the housing, and the end caps having electrical lead wires connected thereto to permit the fuse to be connected into a circuit without use of a fuse holder, the method comprising the step of forming a sub-assembly by uniting the ends of the tubular housing and the fusible element to respective end caps of the tubular housing with a solder joint, characterised in that during said forming step an axial force is maintained on each end cap to urge each end cap into direct mechanical contact with the pertaining end face of the housing so that solder alloy is substantially absent from the site of said direct mechanical contact and in that, subsequent to the solder alloy having solidified, the method comprises the further step of simultaneously resistance welding the lead wires directly to respective end caps of the sub-assembly using opposed thrust forces which are transmitted through the said direct mechanical contacts to the tubular housing,
- wherein the end caps are selected to have comparatively thick base portions and thin side walls, the thickness ratio being within the range 1.3 to 1 and 2.1 to 1, and the solder alloy is selected to have a comparatively high melting point, in excess of 180°C, whereby the sub-assembly is sufficiently robust to withstand the forces involved in the resistance welding process, the side walls of the end caps are sufficiently thin and elastic not to damage the housing when they contract in the solder cooling phase after the caps are soldered to the housing, the solder alloy is of sufficiently high melting point to prevent displacement of the fusible element or the solder joints of the sub-assembly during the resistance welding process, and the end faces of the housing are accurately plane parallel and orthogonal to the axis of the housing.
- According to a second aspect of the present invention there is provided a miniature electrical fuse comprising a fusible element located within a tubular housing made of insulating material and connected between electrically conducting end caps which close off the opposite ends of the housing, the ends of the tubular housing and the fusible element being united to respective end caps by solder joints, and a pair of electrical lead wire secured to respective end caps, characterised in that the electrical lead wires are secured to respective end caps by resistance welded joints, the thickness of that part of the base of each end cap to which a lead wire is secured being greater than the thickness of the side wall of the cap in a ratio between 1.3 to 1 and 2.1 to 1, and in that the end caps are in direct mechanical contact with respective pertaining end faces of the tubular housing so that solder alloy is substantially absent from the sites of mechanical contact.
- The invention will now be further described by way of example, with reference to the accompanying drawing which is an axial view partly in section and to an enlarged scale of one embodiment of fuse according to the invention.
- Referring to the drawings, a fusible element comprising a helical wire 1 wound on an
insulating support 2 is axially located in a cylindricaltubular glass housing 3 whose ends are closed off by electrically conducting metal end caps 4. thehousing 3 could alternatively be made of ceramic or a filled plastic material and fusible element 1 could alternatively be a slant wire, an axial wire, or other element design known in the art. If desired thehousing 3 may be filled with a suitable material e.g. quartz grains, ceramic particles, ceramic wool, ceramic cloth, ceramic paper, polymer granules, inorganic or organic materials intended to release arc-quenching substances when heated, or solid matrix ceramic materials. - The ends of the
tubular housing 3 are made accurately plane parallel and perpendicular to the axis of the housing so that when the solder initially located within each end cap 4 is melted and the end cap is pushed on to thehousing 3 during the assembly of the fuse, direct mechanical contact is achieved between the end cap and the end faces of the housing as shown at 5. In the case of a glass tube this accuracy of the tube end faces can be achieved by setting with a diamond wheel. In the case of a ceramic tube this can be achieved by end grinding after firing. - A flux is used initially to melt the solder into the caps 4 prior to assembly of the fuse, but after solder solidification and prior to such assembly the flux is removed by immersion in a solvent. This ensures that the assembled fuse has a solid metal joint between the end cap and the end faces of the tubular housing, without enclosures of solidified flux. Such enclosures of flux can lead to distortion of the fuse during the subsequent resistance welding process as the enclosures soften at comparatively low temperatures.
- During the assembly process of the fuse when the solder is heated and the end caps 4 are pushed onto the
housing 3, force is maintained on the ends caps 4 throughout the solder cooling process to ensure that the direct mechanical contact with the ends of the tubular housing is retained. The resulting solder joint between thehousing 3 and the side wall of the end caps is shown at 6 and the solder joint to the fuse wire is shown at 7. Solder is substantially squeezed out from and therefore is effectively absent from thesite 5 of direct mechanical contact betweenhousing 3 and end caps 4. - To facilitate the subsequent resistance welding process after the solder has cooled and solidified, the solder is selected to have a comparatively high melting point (for example 180°C or greater) and preferably is an alloy of lead in the range 77-90% and tin in the range 23%-10%. One particular alloy which is suitable is 85% lead and 15% tin. Other alloys containing tin, lead, possibly with antimony and silver in varying proportions, may also be utilised.
- Such an initial construction enables the fuse to withstand the forces and thermal effects involved in the subsequent resistance welding of the
axial lead wires 8 directly to the end caps 4, the welds being shown at 9. - As can be seen, the base of each end cap 4 is thicker than the side wall of the cap within the ratio 1.3 to I and 2.1 to 1. The thick base of the end caps is provided to withstand the subsequent resistance welding process whereas the side wall of the end caps is comparatively thin and elastic so that during the solder cooling process the contraction of the side wall and
solder joint 6 does not lead to excessive forces on the frangible side walls of thehousing 3. For a fuse having a cylindrical tubular housing of approximately 5mm external diameter and an overall length of 15 to 24mm the thickness of the base of each end cap is typically 0.5 to 0.72mm and the side wall thickness is typically 0.3 to 0.45mm. The lead wires may be between 0.4 and 1.0mm in diameter and made of tin plated copper or tin plated copper clad steel. - To effect resistance welding of the
lead wires 8 to the end caps 4 a clamp type electrode is simultaneously fitted to the side wall of each end cap 4 and eachlead wire 8 is gripped by an electrode and urged axially into engagement with the pertaining end cap to form thewelds 9. Thus the opposing axial forces from bothlead wires 8 are transmitted by the comparatively thick end walls of the end caps 4 and their circumferential abutment with the end faces of thehousing 3 to the housing itself. The thermal effects of the resistance welding process are greatest at the outermost surface of the end walls of the end caps 4 where thewelds 9 are formed. Thus the thermal effects are comparatively remote from thesolder joints lead wires 8 are therefore simultaneously fitted directly to the end caps 4 without disturbing the pre-assembled main portion of the fuse. - It will be appreciated that various modifications may be made to the embodiment described above without departing from the scope of the invention as defined by the appended claims. For example only the central area of the base of each end cap to which the
lead wire 8 is attached may be of increased thickness as indicated by the broken line configuration, 4a. Typically in this case the central portion to which the lead wire is welded may be of thickness between 0.5 and 1.0mm.
Claims (6)
- A method of manufacturing a miniature electrical fuse having a fusible element (1) located within a tubular housing (3) made of insulating material, the element (1) being connected between electrically conducting end caps (4) which close off the opposite ends of the housing, and the end caps (4) having electrical lead wires (8) connected thereto to permit the fuse to be connected into a circuit without use of a fuse holder, the method comprising the step of forming a sub-assembly by uniting the ends of the tubular housing (3) and the fusible element (1) to respective end caps of the tubular housing (3) with a solder joint (6, 7), characterised in that during said forming step an axial force is maintained on each end cap (4) to urge each end cap (4) into direct mechanical contact with the pertaining end face of the housing (3) so that solder alloy is substantially absent from the site of said direct mechanical contact and in that, subsequent to the solder alloy having solidified, the method comprises the further step of simultaneously resistance welding the lead wires (8) directly to respective end caps (4) of the sub-assembly using opposed thrust forces which are transmitted through the said direct mechanical contacts to the tubular housing (3), wherein the end caps (4) are selected to have comparatively thick base portions and thin side walls, the thickness ratio being within the range 1.3 to 1 and 2.1 to 1, and the solder alloy is selected to have a comparatively high melting point, in excess of 180°C, whereby the sub-assembly is sufficiently robust to withstand the forces involved in the resistance welding process, the side walls of the end caps (4) are sufficiently thin and elastic not to damage the housing (3) when they contract in the solder cooling phase after the caps (4) are soldered to the housing, the solder alloy is of sufficiently high melting point to prevent displacement of the fusible -element (1) or the solder joints (6,7) of the sub-assembly during the resistance welding process, and the end faces of the housing (3) are accurately plane parallel and orthogonal to the axis of the housing (3).
- The method claimed in claim 1, wherein prior to formation of said sub-assembly each end cap (4) is loaded with solder alloy in the presence of a flux and after solder solidification the flux is removed by immersion in a solvent to prevent inclusions of solidified flux in the solder joints of the sub-assembly.
- The method claimed in claim 1 or claim 2, wherein the solder alloy is a composition of between 77% and 90% lead with the remainder being tin.
- The method claimed in any preceding claim, wherein the tubular housing (3) is made of glass and the end faces are rendered accurately plane parallel and orthogonal to the axis of the housing (3) by cutting with a diamond wheel.
- The method claimed in any one of claim 1 to 3, wherein the tubular housing (3) is made of ceramic and the end faces are reduced accurately plane parallel and orthogonal to the axis of the housing (3) by end grinding after firing.
- A miniature electrical fuse comprising a fusible element (1) located within a tubular housing (3) made of insulating material and connected between electrically conducting end caps (4) which close off the opposite ends of the housing (3), the ends of the tubular housing (3) and the fusible element (1) being united to respective end caps (4) by solder joints (6,7), and a pair of electrical lead wires (8) secured to respective end caps (4), characterised in that the electrical lead wires (8) are secured to respective end caps by resistance welded joints (9), the thickness of that part of the base of each end cap (4) to which a lead wire (8) is secured being greater than the thickness of the side wall of the end cap (4) in a ratio between 1.3 to 1 and 2.1 to 1, and in that the end caps (4) are in direct mechanical contact with respective pertaining end faces of the tubular housing (3) so that solder alloy is substantially absent from the sites of mechanical contact.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15342192A JPH05198248A (en) | 1991-06-13 | 1992-06-12 | Electric fuse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9112726 | 1991-06-13 | ||
GB919112726A GB9112726D0 (en) | 1991-06-13 | 1991-06-13 | Electrical fuses |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0518510A2 EP0518510A2 (en) | 1992-12-16 |
EP0518510A3 EP0518510A3 (en) | 1994-10-26 |
EP0518510B1 true EP0518510B1 (en) | 1997-09-03 |
Family
ID=10696589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920304672 Expired - Lifetime EP0518510B1 (en) | 1991-06-13 | 1992-05-22 | Electrical fuses |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0518510B1 (en) |
DE (1) | DE69221950T2 (en) |
GB (1) | GB9112726D0 (en) |
HK (1) | HK1000773A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007140794A1 (en) * | 2006-06-02 | 2007-12-13 | Mbl Josef Leyerer Kg | Connecting cap for an electrical component, method for producing it, electrical component and method for producing it |
US12040109B2 (en) * | 2019-11-21 | 2024-07-16 | Littelfuse, Inc. | Circuit protection device with PTC device and backup fuse |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8501677A (en) * | 1985-06-11 | 1987-01-02 | Littelfuse Tracor | METHOD FOR ATTACHING A CONNECTING WIRE TO A METAL END CAP OF MELT SAFETY |
US4924203A (en) * | 1987-03-24 | 1990-05-08 | Cooper Industries, Inc. | Wire bonded microfuse and method of making |
US4866411A (en) * | 1988-03-25 | 1989-09-12 | Caddock Richard E | Film-type cylindrical resistor, and method of making it |
-
1991
- 1991-06-13 GB GB919112726A patent/GB9112726D0/en active Pending
-
1992
- 1992-05-22 EP EP19920304672 patent/EP0518510B1/en not_active Expired - Lifetime
- 1992-05-22 DE DE1992621950 patent/DE69221950T2/en not_active Expired - Fee Related
-
1997
- 1997-12-03 HK HK97102324A patent/HK1000773A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0518510A3 (en) | 1994-10-26 |
DE69221950T2 (en) | 1998-02-19 |
GB9112726D0 (en) | 1991-07-31 |
DE69221950D1 (en) | 1997-10-09 |
HK1000773A1 (en) | 1998-04-24 |
EP0518510A2 (en) | 1992-12-16 |
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