US3838376A - Electric fuses - Google Patents

Electric fuses Download PDF

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Publication number
US3838376A
US3838376A US00329197A US32919773A US3838376A US 3838376 A US3838376 A US 3838376A US 00329197 A US00329197 A US 00329197A US 32919773 A US32919773 A US 32919773A US 3838376 A US3838376 A US 3838376A
Authority
US
United States
Prior art keywords
fuse element
fuse
electric
surrounded
cadmium
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
Application number
US00329197A
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English (en)
Inventor
O Norholm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AK LAUR KNUDSEN ELEKTRICITETS SELSKAB DK
KNUDSEN NORDISK ELECT
Cooper Industries LLC
Original Assignee
KNUDSEN NORDISK ELECT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KNUDSEN NORDISK ELECT filed Critical KNUDSEN NORDISK ELECT
Application granted granted Critical
Publication of US3838376A publication Critical patent/US3838376A/en
Assigned to MCGRAW-EDISON COMPANY, A DE CORP. reassignment MCGRAW-EDISON COMPANY, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: A/S LAUR. KNUDSEN NORDISK ELEKRICITETS SELSKAB
Assigned to COOPER INDUSTRIES, INC., A CORP. OF OH. reassignment COOPER INDUSTRIES, INC., A CORP. OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MCGRAW-EDISON COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H85/055—Fusible members
    • 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
    • H01H85/0039—Means for influencing the rupture process of the fusible element
    • H01H85/0043—Boiling of a material associated with the fusible element, e.g. surrounding fluid

Definitions

  • the present invention relates toan electric fusehaving at least one fuse element of metal which at least partly surrounds another material and which fuses as a result of the heat generated by the passage of current whereby the electrical circuit is broken.
  • the invention relates to such fuses where the fuse element consists of metal having a substantial affinity to oxygen.
  • the fusing point of aluminium is about 660C while its boiling point is about 2,000C.
  • the object of the present invention is to eliminate the above mentioned drawbacks in such a manner that the fuse element will open the electrical circuit very quickly after the fuse element has reached its fusing temperature.
  • the said other material has its boiling point near the fusing point of the fuse element.
  • said other material e.g., another metal
  • the latter will reach a sufficient vapour pressure to burst an oxide film, if any, on the fuse element at a temperature which is close to the fusing temperature of the fuse element, on principle slightly higher.
  • the other material disposed within the fuse element does not otherwise interfere with the function of the fuse. Therefore the surrounded material is preferably a material which will not react in a disturbing manner either physically or chemically with the fuse element at a temperature below the fusing temperature of the latter. Thus, at temperatures substantially below the fusing point of the fuse element it must not react chemically with the fuse element or form an alloy with it or migrate into it by diffusion. However, there is no hindrance to making use of such processes in the same fuse, such as it is generally known to do, if this is found desirable.
  • the invention should not be confused with the well known method generally known under the term metallurgical effect or M-effect, where a different metal in or on the fuse element or in close proximity thereto at a temperature lower than the fusing temperature of the fuse element causes such changes that the fusing is accelerated resulting in a substantial change of the electrical properties of the fuse.
  • the surrounded material in a cross-section transverse to the current direction should not exceed one fourth of the total crosssectional area of the fuse element.
  • the fuse element completely surrounds the said other material on all sides and according to an ambodiment of the invention the surrounded material may be placed in a passage completely or partly open at both ends, said passage running substantially transversely to the direction of the electric current.
  • This embodiment may be technologically advantageous in many cases.
  • FIG. 1 shows a part of a cylindrical fuse element according to one embodiment of the invention
  • FIG. 2' shows a fuse element according to a preferred embodiment of the invention
  • FIG. 3 shows a practical construction of a fuse strip provided with the fuse element of FIG. 2.
  • FIG. 1 a cylindrical fuse element 1 surrounds another material 2 which is shown in dotted line.
  • FIG. 2 a fuse element 1 of rectangular crosssection is shown but in this case the added material 2 is in the form of a filled passage running all through the fuse element so that the material 2 is not completely surrounded by the fuse element.
  • FIG. 3 a practical constructions is shown in which the fuse element 1 is formed by providing notches 4 in a metal strip 3 in such a manner that the surrounded material 2 will be located in the fuse element 1 thereby formed.
  • the fuse element 1 is formed by providing notches 4 in a metal strip 3 in such a manner that the surrounded material 2 will be located in the fuse element 1 thereby formed.
  • the fuse elements e.g., 1
  • notches 4' may be provided which further fuse elements may be carried out in accordance with the invention or in another way.
  • Electric fuse having at least one fuse element of metal which at least partly surrounds another material, characterized in that said other material has its boiling point near the fusing point of the fuse element and the surrounded material is a material which will not react in a disturbing manner either physically or chemically with the fuse element at a temperature below the fusing temperature of the latter.
  • Electric fuse according to claim 1 characterized in that in a cross-section transverse to the current direction the surrounded material does not exceed one fourth of the total cross-sectional area of the fuse element.
  • the fuse element has a passage therein, which passage extends in a direction substantially transverse to the direction of the electric current and is at least partially open at both ends, and the surrounded material is placed within the passage.
US00329197A 1972-02-04 1973-02-02 Electric fuses Expired - Lifetime US3838376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK49772*#A DK131835C (da) 1972-02-04 1972-02-04 Elektrisk smeltesikring

Publications (1)

Publication Number Publication Date
US3838376A true US3838376A (en) 1974-09-24

Family

ID=8094228

Family Applications (1)

Application Number Title Priority Date Filing Date
US00329197A Expired - Lifetime US3838376A (en) 1972-02-04 1973-02-02 Electric fuses

Country Status (11)

Country Link
US (1) US3838376A (it)
JP (1) JPS4883351A (it)
BE (1) BE794807A (it)
CA (1) CA972404A (it)
CH (1) CH557595A (it)
DE (1) DE2304306A1 (it)
DK (1) DK131835C (it)
FR (1) FR2170204B1 (it)
IT (1) IT980950B (it)
NL (1) NL7301459A (it)
SE (1) SE376999B (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374371A (en) * 1980-01-17 1983-02-15 Kearney-National, Inc. Cadmium electric fuse
US4547830A (en) * 1979-09-11 1985-10-15 Rohm Company Limited Device for protection of a semiconductor device
US4869972A (en) * 1987-04-06 1989-09-26 Yazaki Corporation Material for fuse
US5139883A (en) * 1989-05-09 1992-08-18 Grigory Raykhtsaum Intermetallic time-temperature integration fuse
US20050040926A1 (en) * 2001-10-03 2005-02-24 Brian Ely Fuse element and method for making same
US20070200194A1 (en) * 2006-02-28 2007-08-30 Alfons Graf Apparatus And Method For Temperature-Interrupting Protection Of An Electric Device
US20090189730A1 (en) * 2008-01-30 2009-07-30 Littelfuse, Inc. Low temperature fuse
US20170040136A1 (en) * 2013-12-23 2017-02-09 Schurter Ag A fuse element, a fuse, a method for producing a fuse, smd fuse and smd circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413246A (en) * 1981-08-27 1983-11-01 Kearney-National Inc. Metallic coating for a cadmium fuse

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA626530A (en) * 1961-08-29 Sigmund Cohn Corp. Fuse member and method of making the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB442375A (en) * 1934-08-03 1936-02-03 John Ashworth Crabtree Improvements in, or relating to, fusible electric cut-outs
DE664793C (de) * 1936-03-04 1938-09-12 Schiele Industriewerke Inhaber Schmelzleiter fuer elektrische Sicherungen
US2557926A (en) * 1949-03-01 1951-06-26 Chase Shawmut Co Time-delay electric fuse
US3236976A (en) * 1961-06-22 1966-02-22 Gen Electric Fuse device
FR1442164A (fr) * 1964-08-06 1966-06-10 Siemens Ag Procédé de fabrication des conducteurs fusibles en forme de bande dans des éléments inertes de remplacement et conducteurs fusibles obtenus au moyen de ce procédé

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA626530A (en) * 1961-08-29 Sigmund Cohn Corp. Fuse member and method of making the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547830A (en) * 1979-09-11 1985-10-15 Rohm Company Limited Device for protection of a semiconductor device
US4374371A (en) * 1980-01-17 1983-02-15 Kearney-National, Inc. Cadmium electric fuse
US4869972A (en) * 1987-04-06 1989-09-26 Yazaki Corporation Material for fuse
US5139883A (en) * 1989-05-09 1992-08-18 Grigory Raykhtsaum Intermetallic time-temperature integration fuse
US20050040926A1 (en) * 2001-10-03 2005-02-24 Brian Ely Fuse element and method for making same
US7312688B2 (en) 2001-10-03 2007-12-25 Metalor Technologies International S.A. Fuse element and method for making same
US20070200194A1 (en) * 2006-02-28 2007-08-30 Alfons Graf Apparatus And Method For Temperature-Interrupting Protection Of An Electric Device
US20090189730A1 (en) * 2008-01-30 2009-07-30 Littelfuse, Inc. Low temperature fuse
US20170040136A1 (en) * 2013-12-23 2017-02-09 Schurter Ag A fuse element, a fuse, a method for producing a fuse, smd fuse and smd circuit
US10192705B2 (en) * 2013-12-23 2019-01-29 Schurter Ag Fuse element, a fuse, a method for producing a fuse, SMD fuse and SMD circuit

Also Published As

Publication number Publication date
FR2170204B1 (it) 1976-11-05
CA972404A (en) 1975-08-05
IT980950B (it) 1974-10-10
DE2304306A1 (de) 1973-08-16
SE376999B (it) 1975-06-16
JPS4883351A (it) 1973-11-07
DK131835B (da) 1975-09-08
BE794807A (fr) 1973-05-16
DK131835C (da) 1976-02-09
NL7301459A (it) 1973-08-07
FR2170204A1 (it) 1973-09-14
CH557595A (de) 1974-12-31

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MCGRAW-EDISON COMPANY, ROLLING MEADOWS, ILL A DE C

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:A/S LAUR. KNUDSEN NORDISK ELEKRICITETS SELSKAB;REEL/FRAME:004293/0076

Effective date: 19840703

AS Assignment

Owner name: COOPER INDUSTRIES, INC., 1001 FANNIN, HOUSTON, TEX

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MCGRAW-EDISON COMPANY;REEL/FRAME:004510/0810

Effective date: 19860130