US3838376A - Electric fuses - Google Patents
Electric fuses Download PDFInfo
- 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
Links
Images
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.
Landscapes
- Fuses (AREA)
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 (fr) |
JP (1) | JPS4883351A (fr) |
BE (1) | BE794807A (fr) |
CA (1) | CA972404A (fr) |
CH (1) | CH557595A (fr) |
DE (1) | DE2304306A1 (fr) |
DK (1) | DK131835C (fr) |
FR (1) | FR2170204B1 (fr) |
IT (1) | IT980950B (fr) |
NL (1) | NL7301459A (fr) |
SE (1) | SE376999B (fr) |
Cited By (8)
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)
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)
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)
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 |
-
0
- BE BE794807D patent/BE794807A/fr unknown
-
1972
- 1972-02-04 DK DK49772*#A patent/DK131835C/da active
-
1973
- 1973-01-29 CH CH124173A patent/CH557595A/xx not_active IP Right Cessation
- 1973-01-30 DE DE2304306A patent/DE2304306A1/de active Pending
- 1973-01-31 CA CA162,536A patent/CA972404A/en not_active Expired
- 1973-02-01 NL NL7301459A patent/NL7301459A/xx unknown
- 1973-02-02 FR FR7303722A patent/FR2170204B1/fr not_active Expired
- 1973-02-02 JP JP48013622A patent/JPS4883351A/ja active Pending
- 1973-02-02 SE SE7301496A patent/SE376999B/xx unknown
- 1973-02-02 IT IT67224/73A patent/IT980950B/it active
- 1973-02-02 US US00329197A patent/US3838376A/en not_active Expired - Lifetime
Patent Citations (1)
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)
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 (fr) | 1976-11-05 |
DK131835B (da) | 1975-09-08 |
JPS4883351A (fr) | 1973-11-07 |
DK131835C (da) | 1976-02-09 |
DE2304306A1 (de) | 1973-08-16 |
CH557595A (de) | 1974-12-31 |
BE794807A (fr) | 1973-05-16 |
SE376999B (fr) | 1975-06-16 |
NL7301459A (fr) | 1973-08-07 |
IT980950B (it) | 1974-10-10 |
FR2170204A1 (fr) | 1973-09-14 |
CA972404A (en) | 1975-08-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3838376A (en) | Electric fuses | |
US4797519A (en) | Mercury tilt switch and method of manufacture | |
US3420944A (en) | Lead-in conductor for electrical devices | |
US6064293A (en) | Thermal fuse for high-temperature batteries | |
US4118684A (en) | One piece fusible conductor for low voltage fuses | |
Levinson | Copper metallurgy as a diagnostic tool for analysis of the origin of building fires | |
US4367451A (en) | Fusible element for electric fuses and electric fuse including the element | |
US3140371A (en) | Fuse constructions | |
US2916589A (en) | Mercury button switch with resilient seal | |
US4413246A (en) | Metallic coating for a cadmium fuse | |
US3214558A (en) | Contact arrangement exhibiting reduced material migration | |
US5122774A (en) | Sub-miniature electrical component, particularly a fuse | |
US4419651A (en) | High voltage current limiting fuse having a fuse element susceptible to oxidation and especially suited for high operating temperatures | |
GB2174256A (en) | Current-limiting fuse | |
US5001451A (en) | Sub-miniature electrical component | |
US5032817A (en) | Sub-miniature electrical component, particularly a fuse | |
US3116390A (en) | Dual element fuses | |
JPS6030020A (ja) | 温度ヒユ−ズ | |
US3017262A (en) | Electric resistance, gas-tight furnace | |
US5102480A (en) | Ag-sno-cdo electrical contact materials and manufacturing method thereof | |
JPH0487224A (ja) | 回路遮断器 | |
JPS6118595Y2 (fr) | ||
US4012707A (en) | Fusible element for electrical apparatus | |
JPS588086B2 (ja) | 電気接点の構造 | |
SU765904A1 (ru) | Способ изготовлени плавких элементов предохранителей с металлургическим эффектом |
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 |