EP0128261A2 - Conducteur fusible pour coupe-circuit électrique - Google Patents

Conducteur fusible pour coupe-circuit électrique Download PDF

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Publication number
EP0128261A2
EP0128261A2 EP84101159A EP84101159A EP0128261A2 EP 0128261 A2 EP0128261 A2 EP 0128261A2 EP 84101159 A EP84101159 A EP 84101159A EP 84101159 A EP84101159 A EP 84101159A EP 0128261 A2 EP0128261 A2 EP 0128261A2
Authority
EP
European Patent Office
Prior art keywords
fuse
coating
fusible conductor
melting point
silver
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.)
Withdrawn
Application number
EP84101159A
Other languages
German (de)
English (en)
Other versions
EP0128261A3 (fr
Inventor
Wolfgang Dr. Böhm
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Publication of EP0128261A2 publication Critical patent/EP0128261A2/fr
Publication of EP0128261A3 publication Critical patent/EP0128261A3/fr
Withdrawn legal-status Critical Current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
    • H01H85/06—Fusible members characterised by the fusible material
    • 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
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/11—Fusible members characterised by the shape or form of the fusible member with applied local area of a metal which, on melting, forms a eutectic with the main material of the fusible member, i.e. M-effect devices

Definitions

  • the invention relates to fusible conductors for electrical fuses, consisting of an electrically highly conductive material with a relatively high melting point, such as silver or copper, which is completely or partially covered with a coating of a metal or an alloy with a relatively low melting point.
  • Electrical fuses protect electrical systems or devices from overcurrents.
  • the active part of such a fuse is a ribbon or wire-shaped fuse element made of an electrically highly conductive material with a relatively high melting point, which melts at impermissibly high currents.
  • Low short-circuit currents, which lead to long melting times, are a particular problem with electrical fuses.
  • frequent small overcurrents can cause the materials used to age.
  • Fusible conductors consist of pure metals, such as copper or silver, or their alloys. In most cases, all or part of them are coated with a material whose melting point is relatively low.
  • the layers can be made of tin, a tin-lead, a tin-zinc or other low-melting alloy, for example consist.
  • the support serves to diffuse into the base material, thereby increasing the resistance and thus leading to accelerated melting of the fuse element.
  • Such fuses are described for example in DE-OS 23 48 771. In the course of time, however, especially when the currents are just permissible, undesirable diffusion of these active alloys into the base material can occur. This changes the resistance of the fuse element and the response characteristic of the fuse.
  • This object was achieved in that an intermediate layer of a material is arranged between the fusible conductor material and the support, which is insoluble or poorly soluble in the fusible conductor material and is readily soluble in the molten state of the support material.
  • the intermediate layer acts as a diffusion barrier between the fuse element material and the support. As a result, it prevents the undesired diffusion of the support material into the fuse element material in the event of long-term stress without in turn diffusing into the fuse element material. Aging is therefore excluded. In the case of a short Finally, the diffusion barrier, which has a high solubility in the covering material, is dissolved and ineffective at the temperatures that arise. This ensures that the fuse blows quickly.
  • the material for the diffusion-blocking intermediate layer is preferably cobalt, iron or antimony in the case of copper as the fusible conductor material, or nickel and lead in the case of silver.
  • a particularly good diffusion barrier provides z.
  • B. is a thin layer of lead on silver. Lead is not soluble in silver. On the other hand, lead is soluble in soft solders containing tin, which are used as coating materials. The alloy composition of the soft solder can be chosen so that the diffusing lead lowers its melting point. This speeds up the reaction with the silver. Appropriate dimensions, geometry and material combination of the individual layers improve the selectivity of the current-time characteristic. This represents a major technical advance compared to the fuses used hitherto. For the mode of operation of these fusible conductors, it is irrelevant whether they are in the form of wires, strips or tubes.
  • bismuth alloys in particular bismuth alloys with 30% tin or 30% tin and 10% lead, have proven suitable as coating materials.
  • the figure shows schematically a cross section through a fuse element in tape form according to the invention.
  • a 0.05 mm thick intermediate layer (3) made of lead is arranged between the fusible conductor material (1) made of a 0.2 mm thick silver band and the 0.15 mm thick layer (2) made of tin.

Landscapes

  • Fuses (AREA)
  • Saccharide Compounds (AREA)
  • Vending Machines For Individual Products (AREA)
EP84101159A 1983-05-28 1984-02-04 Conducteur fusible pour coupe-circuit électrique Withdrawn EP0128261A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3319488 1983-05-28
DE3319488 1983-05-28

Publications (2)

Publication Number Publication Date
EP0128261A2 true EP0128261A2 (fr) 1984-12-19
EP0128261A3 EP0128261A3 (fr) 1985-10-09

Family

ID=6200182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101159A Withdrawn EP0128261A3 (fr) 1983-05-28 1984-02-04 Conducteur fusible pour coupe-circuit électrique

Country Status (3)

Country Link
EP (1) EP0128261A3 (fr)
DK (1) DK60784A (fr)
NO (1) NO840070L (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638943A1 (de) * 1985-11-15 1987-05-21 Fuji Electric Co Ltd Schmelzsicherung
US5139883A (en) * 1989-05-09 1992-08-18 Grigory Raykhtsaum Intermetallic time-temperature integration fuse
WO2001086684A1 (fr) * 2000-05-08 2001-11-15 Abb Research Ltd Conducteur fusible, son procede de fabrication, conducteur de securite et coupe-circuit a fusible
EP2860750A1 (fr) * 2013-10-11 2015-04-15 Littelfuse, Inc. Couche barrière pour améliorer les performances des fusibles électriques en utilisant l'effet Metcalf

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH303424A (de) * 1951-01-19 1954-11-30 Elektrotechnische Spezialfabri Kurzschlusssichere, elektrische Schmelzsicherung.
FR1106344A (fr) * 1953-08-07 1955-12-16 D App Electr Sprecher & Schuh Fusible de sécurité
DE1290239B (de) * 1963-05-10 1969-03-06 Siemens Ag Elektrische Schmelzsicherung
CH553478A (de) * 1972-06-15 1974-08-30 Schurter Ag H Traeger schmelzeinsatz.
DE3044711A1 (de) * 1980-11-27 1982-07-01 Wickmann-Werke GmbH, 5810 Witten Schmelzsicherung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638943A1 (de) * 1985-11-15 1987-05-21 Fuji Electric Co Ltd Schmelzsicherung
US5139883A (en) * 1989-05-09 1992-08-18 Grigory Raykhtsaum Intermetallic time-temperature integration fuse
WO2001086684A1 (fr) * 2000-05-08 2001-11-15 Abb Research Ltd Conducteur fusible, son procede de fabrication, conducteur de securite et coupe-circuit a fusible
US6791448B2 (en) 2000-05-08 2004-09-14 Abb Research Ltd Fusible element, method for production thereof, safety circuit and fuse
EP2860750A1 (fr) * 2013-10-11 2015-04-15 Littelfuse, Inc. Couche barrière pour améliorer les performances des fusibles électriques en utilisant l'effet Metcalf

Also Published As

Publication number Publication date
DK60784A (da) 1984-11-29
EP0128261A3 (fr) 1985-10-09
NO840070L (no) 1984-11-29
DK60784D0 (da) 1984-02-10

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19840204

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Effective date: 19860820

18W Application withdrawn

Withdrawal date: 19860918

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BOEHM, WOLFGANG, DR.