EP0663679A2 - Electrical fuse and method for producing the same - Google Patents

Electrical fuse and method for producing the same Download PDF

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Publication number
EP0663679A2
EP0663679A2 EP94118243A EP94118243A EP0663679A2 EP 0663679 A2 EP0663679 A2 EP 0663679A2 EP 94118243 A EP94118243 A EP 94118243A EP 94118243 A EP94118243 A EP 94118243A EP 0663679 A2 EP0663679 A2 EP 0663679A2
Authority
EP
European Patent Office
Prior art keywords
radiation
electrical fuse
insulating part
thermoplastic
resistance
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.)
Granted
Application number
EP94118243A
Other languages
German (de)
French (fr)
Other versions
EP0663679A3 (en
EP0663679B1 (en
Inventor
Felix Fischbach
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.)
Schurter AG
Original Assignee
Schurter AG
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 Schurter AG filed Critical Schurter AG
Publication of EP0663679A2 publication Critical patent/EP0663679A2/en
Publication of EP0663679A3 publication Critical patent/EP0663679A3/en
Application granted granted Critical
Publication of EP0663679B1 publication Critical patent/EP0663679B1/en
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
    • 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
    • H01H85/165—Casings
    • H01H85/17—Casings characterised by the casing material

Abstract

The electrical fuse has an insulating section of a thermoplastic material, crosslinked by radiation. Also claimed is a mfg. process where the insulating section is formed by an injection moulded thermoplastic. After moulding, the component is subjected to radiation for crosslinking.

Description

Die Erfindung betrifft eine elektrische Sicherung nach dem Oberbegriff des Anspruch 1 und ein Verfahren zu ihrer Herstellung.The invention relates to an electrical fuse according to the preamble of claim 1 and a method for its manufacture.

Isolierkörper elektrischer Sicherungen müssen eine Reihe von Bedingungen erfüllen, wie Wärmebeständigkeit, Kriechstromfestigkeit und Lichtbogenhemmung.Insulators in electrical fuses must meet a number of conditions, such as heat resistance, tracking resistance and arc resistance.

Elektrisch isolierende Werkstoffe, welche die geforderte Wärmebeständigkeit, Kriechstromfestigkeit und Lichtbogenhemmung gleichermassen aufweisen, sind meist nicht durch Spritzguss formbar und daher nur in einfachen Formen herstellbar (z.B.: Glas, Keramik, ungesättigte Polyester); wenn sie durch Spritzguss formbar sind, geschieht dies mit sehr grossem Aufwand (z.B.: fluorhaltige Thermoplaste).Electrically insulating materials, which have the required heat resistance, tracking resistance and arc resistance, are usually not moldable by injection molding and can therefore only be produced in simple forms (eg: glass, ceramic, unsaturated polyester); if they can be shaped by injection molding, this is done with great effort (eg: fluorine-containing thermoplastics).

Als elektrisch isolierende Werkstoffe, welche teilweise oder ganz durch Spritzguss formbar sind, kennt man Duroplaste für niedrige Gebrauchstemperaturen (z.B.: MF, MP, EP, UP, PUR) mit schlechter Wärmebeständigkeit, guter Kriechstromfestigkeit und Lichtbogenhemmung, und Duroplaste für hohe Gebrauchstemperaturen (z.B.:PI, PF, EP), welche eine schlechte Kriechstromfestigkeit und Lichtbogenhemmung haben.Thermosets for low service temperatures (e.g.: MF, MP, EP, UP, PUR) with poor heat resistance, good tracking resistance and arc resistance, and thermosets for high service temperatures (e.g.: PI, PF, EP), which have poor tracking resistance and arc inhibition.

Elektrisch isolierende Werkstoffe aus der Gruppe der fluorfreien Thermoplaste sind zwar gut durch Spritzguss formbar, haben aber entweder eine schlechte Wärmebeständigkeit (z.B.: PE, PA, PP) bei guter Kriechstromfestigkeit und Lichtbogenhemmung, oder eine gute Wärmebeständigkeit bei schlechter Kriechstromfestigkeit und Lichtbogenhemmung (z.B.: PSU, PES, PEK, PEEK, PPS).Electrically insulating materials from the group of fluorine-free thermoplastics can be easily molded by injection molding, but either have poor heat resistance (e.g. PE, PA, PP) with good tracking resistance and arc resistance, or good heat resistance with poor tracking resistance and arc resistance (e.g. PSU , PES, PEK, PEEK, PPS).

Man muss also die gute Formbarkeit durch Spritzguss und die einfache Nachbearbeitbarkeit mit einer schlechten Wärmebeständigkeit oder mit einer schlechten Kriechstromfestigkeit und Lichtbogenhemmung erkaufen.So you have to buy the good formability by injection molding and the easy reworkability with poor heat resistance or with poor tracking resistance and arc resistance.

Sicherungen sind Massenartikel, bei denen die einfache Herstellbarkeit, insbesondere des Isolierkörpers, ohne Einschränkungen in der Formgebung von entscheidender Bedeutung ist, wobei man das Nacharbeiten, wie es bei Duroplasten nötig ist rationellerweise vermeiden sollte. Zumindest dort, wo Sicherungen in einer Schaltung eingelötet werden (insbesondere bei SMD) ist Lötwärmebeständigkeit nötig, und auch Kriechstromfestigkeit und Lichtbogenhemmung werden verlangt.Fuses are mass-produced articles in which the ease of manufacture, in particular of the insulating body, is of decisive importance without any restrictions in terms of shape, and the reworking that is necessary with thermosets should be avoided rationally. At least where fuses are soldered into a circuit (especially with SMD), resistance to soldering heat is required, and resistance to leakage current and arc resistance are also required.

Der Erfindung liegt die Aufgabe zugrunde, eine Sicherung zu schaffen, deren Isolierteil durch Spritzguss einfach herstellbar ist und die neben einer guten Wärmebeständigkeit auch eine gute Kriechstromfestigkeit und gut Lichtbogenhemmung aufweist.The invention has for its object to provide a fuse, the insulating part is easy to manufacture by injection molding and which in addition to good heat resistance also has good tracking resistance and good arc resistance.

Zur Lösung dieser Aufgabe wird die im Anspruch 1 gekennzeichnete Sicherung vorgeschlagen.To achieve this object, the fuse characterized in claim 1 is proposed.

Es wurde nämlich überraschenderweise gefunden, dass ein gut durch Spritzguss formbarer und gute Kriechstromfestigkeit und Lichtbogenhemmung aufweisender, aber schlecht wärmebeständiger Thermoplast durch Strahlenvernetzung in seiner Wärmebeständigkeit sehr verbessert werden kann, ohne seine im unvernetzten Zustand vorhanden gewesene gute Kriechstromfestigkeit und Lichtbogenhemmung zu verlieren.Surprisingly, it was found that a thermoplastic that is easily moldable and has good tracking resistance and arcing inhibition, but has poor heat resistance, can be greatly improved in its heat resistance by radiation crosslinking without losing its good tracking resistance and arc inhibition that was present in the uncrosslinked state.

Bekanntlich setzt man manchen der Bestrahlung zur Strahlenvernetzung bestimmten Thermoplasten einen Vernetzungsverstärker (z.B. Triallylisocyanurat, mit Schmelzpunkt von 24 bis 26 Celsiusgrad) zu, was auch im vorliegenden Falle vorteilhaft sein kann.It is known that some crosslinking intensifiers (e.g. triallyl isocyanurate, with a melting point of 24 to 26 degrees Celsius) are added to some of the thermoplastics intended for radiation crosslinking, which can also be advantageous in the present case.

Zur Strahlenvernetzung für die Zwecke der Erfindung eignen sich Elektronenstrahlen in einer Dosis von 10 MRad, entsprechend 100 kGy.Electron beams in a dose of 10 MRad, corresponding to 100 kGy, are suitable for radiation crosslinking for the purposes of the invention.

Ein dergestalt strahlenvernetztes Polyamid, z.B. ein strahlenvernetztes Polyamid 6.6 hat sich als für die Erfindung geeignet erwiesen.A radiation cross-linked polyamide, e.g. a radiation-crosslinked polyamide 6.6 has proven suitable for the invention.

Dabei kann die Herstellung des Isolierteils der Sicherung durch Spritzguss aus noch nicht strahlenvernetztem Thermoplast (insbesondere Polyamid, vorzugsweise Polyamid 6.6) erfolgen und die Strahlenvernetzung am geformten Thermoplast-Teil durchgeführt werden.The insulating part of the fuse can be produced by injection molding from thermoplastic which has not yet been crosslinked by radiation (in particular polyamide, preferably polyamide 6.6) and the radiation crosslinking can be carried out on the molded thermoplastic part.

Obschon auch die Strahlenvernetzung an der fertigen Sicherung nicht auszuschliessen ist, wird es bevorzugt, das Thermoplast-Teil durch Bestrahlen zu vernetzen und dann erst mit den elektrisch leitenden Teilen zu vereinigen.Although radiation crosslinking on the finished fuse cannot be ruled out, it is preferred to crosslink the thermoplastic part by irradiation and only then to combine it with the electrically conductive parts.

Wenn bei Schmelzsicherungen das den Schmelzleiter einschliessende Teil (beispielsweise ein Schmelzeinsatz) aus dem strahlenvernetzten Thermoplast (z.B. aus Polyamid, derzeit bevorzugterweise aus Polyamid 6.6) besteht, ergibt sich eine ausgezeichnete Lichtbogenhemmung.If the part enclosing the fuse element (for example a fuse link) is made of the radiation-crosslinked thermoplastic (e.g. polyamide, currently preferably polyamide 6.6) in the case of fuses, this results in excellent arc resistance.

Dies ist auch besonders bei den kleinen bis kleinsten Sicherungen von Bedeutung, wo man sich bislang oft nur umständlich und manchmal unzureichend behelfen konnte.This is particularly important for small to very small fuses, where previously it was often difficult and sometimes inadequate to manage.

Vorteilhaft ist, dass man selbst komplizierte Formen durch Spritzguss einfach herstellen kann, was sonst bei Werkstoffen mit hoher Temperaturbeständigkeit nicht geht.It is advantageous that even complicated shapes can be easily produced by injection molding, which is otherwise not possible with materials with high temperature resistance.

Wegen der guten Kriechstrombeständigkeit und der guten Lichtbogenhemmung ist die Erfindung für die einen Schmelzleiter einschliessenden Isolierteile besonders vorteilhaft.Because of the good tracking resistance and the good arc resistance, the invention is particularly advantageous for the insulating parts including a fuse element.

Neben diesen Vorteilen ist es weiter vorteilhaft, dass der Preis des zur strahlenvernetzung befähigten ten Thermoplasts, insbesondere Polyamids, vorzugsweise Polyamid 6.6, niedrig ist, und die Bestrahlung kostenmässig günstig durchführbar ist..In addition to these advantages, it is further advantageous that the price of the thermoplastic capable of radiation crosslinking, in particular polyamide, preferably polyamide 6.6, is low and that the radiation can be carried out at low cost.

Als weiterer Vorteil sind die erzielbaren kurzen Spritzzykluszeiten zu nennen.The short spray cycle times that can be achieved are another advantage.

Claims (8)

Elektrische Sicherung mit einem Isolierteil, dadurch gekennzeichnet, dass das Isolierteil aus einem strahlenvernetzten Thermoplast besteht.Electrical fuse with an insulating part, characterized in that the insulating part consists of a radiation-crosslinked thermoplastic. Elektrische Sicherung nach Anspruch 1, dadurch gekennzeichnet, dass das einen Schmelzleiter umgebende Isolierteil aus dem strahlenvernetzten Thermoplast besteht.Electrical fuse according to claim 1, characterized in that the insulating part surrounding a fusible conductor consists of the radiation-crosslinked thermoplastic. Elektrische Sicherung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der strahlenvernetzte Thermoplast ein strahlenvernetztes Polyamid, wie ein strahlenvernetztes Polyamid 6.6 ist.Electrical fuse according to claim 1 or 2, characterized in that the radiation-crosslinked thermoplastic is a radiation-crosslinked polyamide, such as a radiation-crosslinked polyamide 6.6. Elektrische Sicherung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das elektrische Isolierteil gleichzeitig wärmebeständig, kriechstromfest und lichtbogenresistent, also lichbogenhemmend ist.Electrical fuse according to one of claims 1 to 3, characterized in that the electrical insulating part is at the same time heat-resistant, tracking current-resistant and arc-resistant, that is to say arc-resistant. Verfahren zum Herstellen der elektrischen Sicherung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass man das Isolierteil aus noch nicht strahlenvernetztem Thermoplast durch Spritzgiessen formt und erst nach der Formgebung so bestrahlt, dass die Strahlenvernetzung stattfindet.Method for producing the electrical fuse according to one of Claims 1 to 4, characterized in that the insulating part is made from thermoplastic which has not yet been cross-linked by injection molding and is irradiated only after shaping in such a way that the cross-linking takes place. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass ein einen Vernetzungsverstärker enthaltender Thermoplast dem Spritzgiessen unterworfen wird.A method according to claim 5, characterized in that a thermoplastic containing a crosslinking amplifier is subjected to injection molding. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Bestrahlung mit Elektronenstrahlen vorgenommen wird.A method according to claim 5 or 6, characterized in that the irradiation is carried out with electron beams. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass das von leitenden Teilen freie Isolierteil der Bestrahlung ausgesetzt wird.Method according to one of claims 5 to 7, characterized in that the insulating part free of conductive parts is exposed to the radiation.
EP19940118243 1994-01-13 1994-11-19 Electrical fuse and method for producing the same Expired - Lifetime EP0663679B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10094A CH689681A5 (en) 1994-01-13 1994-01-13 Electrical fuse and method for its production.
CH100/94 1994-01-13

Publications (3)

Publication Number Publication Date
EP0663679A2 true EP0663679A2 (en) 1995-07-19
EP0663679A3 EP0663679A3 (en) 1996-01-10
EP0663679B1 EP0663679B1 (en) 1998-06-10

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EP19940118243 Expired - Lifetime EP0663679B1 (en) 1994-01-13 1994-11-19 Electrical fuse and method for producing the same

Country Status (4)

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EP (1) EP0663679B1 (en)
JP (1) JPH07220615A (en)
CH (1) CH689681A5 (en)
DE (1) DE59406206D1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044818A1 (en) * 2001-11-20 2003-05-30 Mitsubishi Denki Kabushiki Kaisha Circuit breaker
EP1467395A1 (en) * 2001-12-27 2004-10-13 Yazaki Corporation Fuse for automobile
EP1923897A2 (en) * 2006-11-16 2008-05-21 ABB PATENT GmbH Electric switch
WO2011113721A3 (en) * 2010-03-15 2011-11-10 Osram Opto Semiconductors Gmbh Optoelectronic component and method for the production thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044540A1 (en) * 2005-09-17 2007-03-22 Abb Patent Gmbh Electrical service switching device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848215A (en) * 1973-11-09 1974-11-12 Chase Shawmut Co Fluid-tight electric fuse
US3913051A (en) * 1974-05-22 1975-10-14 Mc Graw Edison Co Protector for electric circuits
DE8704621U1 (en) * 1987-03-28 1987-07-02 Wickmann Werke Gmbh
WO1989009128A1 (en) * 1988-03-29 1989-10-05 Raychem Corporation Wrap-around heat-recoverable sealing article
JPH02213456A (en) * 1989-02-15 1990-08-24 Sumitomo Electric Ind Ltd Fuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848215A (en) * 1973-11-09 1974-11-12 Chase Shawmut Co Fluid-tight electric fuse
US3913051A (en) * 1974-05-22 1975-10-14 Mc Graw Edison Co Protector for electric circuits
DE8704621U1 (en) * 1987-03-28 1987-07-02 Wickmann Werke Gmbh
WO1989009128A1 (en) * 1988-03-29 1989-10-05 Raychem Corporation Wrap-around heat-recoverable sealing article
JPH02213456A (en) * 1989-02-15 1990-08-24 Sumitomo Electric Ind Ltd Fuse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014 no. 513 (C-0777) ,9.November 1990 & JP-A-02 213456 (SUMITOMO ELECTRIC IND LTD) 24.August 1990, *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044818A1 (en) * 2001-11-20 2003-05-30 Mitsubishi Denki Kabushiki Kaisha Circuit breaker
EP1467395A1 (en) * 2001-12-27 2004-10-13 Yazaki Corporation Fuse for automobile
EP1467395A4 (en) * 2001-12-27 2005-03-30 Yazaki Corp Fuse for automobile
EP1923897A2 (en) * 2006-11-16 2008-05-21 ABB PATENT GmbH Electric switch
EP1923897A3 (en) * 2006-11-16 2009-01-07 ABB PATENT GmbH Electric switch
WO2011113721A3 (en) * 2010-03-15 2011-11-10 Osram Opto Semiconductors Gmbh Optoelectronic component and method for the production thereof
US9121585B2 (en) 2010-03-15 2015-09-01 Osram Opto Semiconductors Gmbh Optoelectronic component and method for the production thereof

Also Published As

Publication number Publication date
CH689681A5 (en) 1999-08-13
DE59406206D1 (en) 1998-07-16
JPH07220615A (en) 1995-08-18
EP0663679A3 (en) 1996-01-10
EP0663679B1 (en) 1998-06-10

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