EP0285044A2 - Fusible thermique pour appareils électriques - Google Patents

Fusible thermique pour appareils électriques Download PDF

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Publication number
EP0285044A2
EP0285044A2 EP88104917A EP88104917A EP0285044A2 EP 0285044 A2 EP0285044 A2 EP 0285044A2 EP 88104917 A EP88104917 A EP 88104917A EP 88104917 A EP88104917 A EP 88104917A EP 0285044 A2 EP0285044 A2 EP 0285044A2
Authority
EP
European Patent Office
Prior art keywords
material insert
thermal fuse
melt material
fuse according
insert
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Withdrawn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
EP88104917A
Other languages
German (de)
English (en)
Other versions
EP0285044A3 (fr
Inventor
Karl-Heinz Geiger
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.)
FRITZ PSCHERER NACHF GmbH
Original Assignee
FRITZ PSCHERER NACHF 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 FRITZ PSCHERER NACHF GmbH filed Critical FRITZ PSCHERER NACHF GmbH
Publication of EP0285044A2 publication Critical patent/EP0285044A2/fr
Publication of EP0285044A3 publication Critical patent/EP0285044A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet

Definitions

  • the invention relates to a thermal fuse for electrical devices with an insulating part with electrical connections and contact elements for producing an electrical current path, a heat transfer plate, a melt material insert as a thermal trigger, and a transfer pin made of insulating material which is guided axially displaceably through the insulating part and on it one end is engaged with the melt material insert and at the other end with the contact elements.
  • the melt material insert collapses when the predetermined temperature is reached, so that the transmission pin under the action of the biasing spring, which is preferably formed by one of the contact elements itself, is also moved and thus the contact elements are disconnected while interrupting the circuit.
  • the difficulty with such temperature fuses is that due to the arrangement and design of the melting material and due to structural changes due to oxidation effects, the melting point of the melting material and thus the triggering temperature of the fuse changes in the long term.
  • the invention is therefore based on the object of designing a temperature fuse of the type mentioned at the outset such that a surface change which changes the melting behavior of the solder is avoided with a simple structure.
  • the melt material insert which preferably consists of tin, is provided with a thin, galvanically applied surface protection layer with a thickness which does not substantially impede the flow of solder.
  • the thickness of the surface coating is selected depending on the material of the fusible link insert on the one hand and the material of the protective coating so that it does not form a self-supporting skin which is too thick and which, when the triggering temperature is reached, i.e. the melting temperature of the melting material, which hinders the collapse of the melting material insert.
  • the choice of the thickness of the surface coating represents a compromise between the highest possible protection against oxidation, which is achieved by the thickest possible surface coating, and an unobstructed triggering, which is favored by a very thin surface layer.
  • tin as a melting material, which is generally used for such temperature safeguards, a surface coating made of copper with a thickness of ⁇ 20 ⁇ m, preferably ⁇ 10 ⁇ m, has proven to be very effective.
  • other surface protective coatings for example made of silver, can also be used.
  • the protection of the melt material insert according to the invention by means of a thin, galvanically applied surface protective coating offers the additional advantage that the shape of the melt material insert can be chosen as desired, which in turn opens up the possibility of the melt material insert and the recess of the heat transfer plate which receives it and is covered on each open side by the heat transfer plate Insulating housing in cross-section alternately to have a polygonal and a circular outline that forms the periphery, so that the determination of the position of the melt material insert is extremely simple and yet there is enough space in the recess to collapse when the release temperature is reached.
  • the melt material insert has a square cross section such that the diagonal of the square corresponds exactly to the diameter of the circular recess in the insulating housing.
  • the two leaf spring-like contact spring elements 2 and 3 are fastened, in the exemplary embodiment shown with the aid of rivets 4, the contact element 3 being designed as a leaf spring which is pretensioned in the open position (FIG. 2). It is in the standby position, i.e. before triggering, pressed by a transmission pin 5 against the contact element 2 to form a continuous current path, the transmission pin 5 being supported on a melt material insert 6, preferably made of tin, which in turn is supported on a heat transfer plate 7.
  • the melting material insert 6 melts, the material flowing into the recess 10 of the insulating material housing, which recess is larger in volume, so that the transmission pin 5 is also pressed down under the action of the spring force of the contact element 3 and thus opens the current path.
  • a surface protective coating 8 in the form of a copper or silver layer with a thickness of approximately 10 ⁇ m or less is applied to the melt material insert 6, which is preferably made of tin, in the exemplary embodiment shown (FIG. 4) this copper layer is covered by a further tin layer 9, so that the external appearance of the melt material insert corresponds exactly to that of an untreated and thus unprotected tin insert.
  • the melt material insert 6 is a square prism, the side length a is selected so that a corresponds to the diameter of the circular recess 10, so that the recess represents the circumference for the use of the melting material and this is thus held in the simplest manner so that there is nevertheless sufficient space for the solder to flow away.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
EP88104917A 1987-04-02 1988-03-26 Fusible thermique pour appareils électriques Withdrawn EP0285044A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3711068 1987-04-02
DE19873711068 DE3711068A1 (de) 1987-04-02 1987-04-02 Temperatursicherung fuer elektrische geraete

Publications (2)

Publication Number Publication Date
EP0285044A2 true EP0285044A2 (fr) 1988-10-05
EP0285044A3 EP0285044A3 (fr) 1990-07-04

Family

ID=6324689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104917A Withdrawn EP0285044A3 (fr) 1987-04-02 1988-03-26 Fusible thermique pour appareils électriques

Country Status (2)

Country Link
EP (1) EP0285044A3 (fr)
DE (1) DE3711068A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668295A1 (fr) * 1990-10-18 1992-04-24 Electrovac Pastille de soudure pour protection thermique.
EP0640997A1 (fr) * 1993-08-26 1995-03-01 Omron Corporation Commutateur
DE102005060965A1 (de) * 2005-06-28 2007-01-04 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische Sicherung mit Verfahren zu ihrer Herstellung
WO2023073298A1 (fr) * 2021-10-29 2023-05-04 Safran Electrical & Power Dispositif d'alimentation électrique à protection thermique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044081A1 (de) * 2000-09-07 2002-04-04 Bosch Gmbh Robert Überlastschutz

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE267828C (fr) *
FR344670A (fr) * 1904-07-08 1904-11-10 Brev Dolter Soc D Expl Des Fil fusible de sureté
US3201646A (en) * 1960-10-03 1965-08-17 Gen Electric Ballast apparatus utilizing temperature responsive fuse
US3168632A (en) * 1961-10-31 1965-02-02 Advance Transformer Co Ballast disconnect device having a coating of flux material
DE2339674C2 (de) * 1973-08-04 1989-09-21 Thermostat-und Schaltgerätebau GmbH & Co KG, 8730 Bad Kissingen Temperaturregler mit Schmelzmetallsicherung
US4065741A (en) * 1977-03-29 1977-12-27 New Nippon Electric Co., Ltd. Thermal fuse with a fusible temperature sensitive pellet
DE2826205C2 (de) * 1978-06-15 1986-11-20 Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg Temperatursicherung für elektrische Geräte
GB2060260A (en) * 1979-09-28 1981-04-29 Mccaughna J R A Thermal Cut-off
DE2942478A1 (de) * 1979-10-20 1981-04-30 Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg Temperatur-sicherungsschalter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668295A1 (fr) * 1990-10-18 1992-04-24 Electrovac Pastille de soudure pour protection thermique.
US5159309A (en) * 1990-10-18 1992-10-27 Electrovac, Fabrikation Elektro-Technischer Spezialartikel Gesellschaft M.B.H. Solder pellet
EP0640997A1 (fr) * 1993-08-26 1995-03-01 Omron Corporation Commutateur
US5534842A (en) * 1993-08-26 1996-07-09 Omron Corporation Circuit breaking switch with fusible element that responds to current overloads
DE102005060965A1 (de) * 2005-06-28 2007-01-04 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische Sicherung mit Verfahren zu ihrer Herstellung
DE102005060965B4 (de) * 2005-06-28 2007-08-16 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische Sicherung mit Verfahren zu ihrer Herstellung
WO2023073298A1 (fr) * 2021-10-29 2023-05-04 Safran Electrical & Power Dispositif d'alimentation électrique à protection thermique
FR3128817A1 (fr) * 2021-10-29 2023-05-05 Safran Electrical & Power Dispositif d’alimentation électrique à protection thermique

Also Published As

Publication number Publication date
EP0285044A3 (fr) 1990-07-04
DE3711068A1 (de) 1988-10-20
DE3711068C2 (fr) 1989-10-05

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