EP3210231B1 - Electric fuse - Google Patents

Electric fuse Download PDF

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Publication number
EP3210231B1
EP3210231B1 EP14835723.9A EP14835723A EP3210231B1 EP 3210231 B1 EP3210231 B1 EP 3210231B1 EP 14835723 A EP14835723 A EP 14835723A EP 3210231 B1 EP3210231 B1 EP 3210231B1
Authority
EP
European Patent Office
Prior art keywords
melting member
electric
band
knife
barrier
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.)
Active
Application number
EP14835723.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3210231A1 (en
Inventor
Brane Lebar
Darko Kos
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.)
Razvojni Center Enem Novi Materiali doo
Original Assignee
Razvojni Center Enem Novi Materiali doo
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 Razvojni Center Enem Novi Materiali doo filed Critical Razvojni Center Enem Novi Materiali doo
Priority to PL14835723T priority Critical patent/PL3210231T3/pl
Publication of EP3210231A1 publication Critical patent/EP3210231A1/en
Application granted granted Critical
Publication of EP3210231B1 publication Critical patent/EP3210231B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
    • H01H85/045—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type
    • H01H85/0456—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type with knife-blade end contacts
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H2085/383—Means for extinguishing or suppressing arc with insulating stationary parts
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H2085/388—Means for extinguishing or suppressing arc using special materials

Definitions

  • the invention concerns an electric fuse with knife-blade contacts.
  • Such inventions belong to electricity, namely to basic electric elements, namely to fuses in which the electric current flows through a part of fusible material and this current is interrupted by means of displacement or interruption thereof in the case of excessive current, namely to fuses with knife-blade-end contacts, and at the same time such invention may also concern the construction concept of the melting member as such.
  • the purpose of the invention is to prevent a fuse with knife-blade contacts from formation of electric arc in the area between said knife-blade contacts instead of increasing the length of the melting member and the casing of the fuse.
  • a fuse is disclosed in US 2008/0122574 A1 , which comprises a tubular casing, consisting of electric insulating material, which is on its both terminal portions closed by means of rigid covers. Each of said covers is furnished with a knife-blade contact, which consists of electric conductive material and is firmly connected therewith.
  • a melting member is mounted inside of said casing and is conceived as a flat band consisting of electric conductive material having a pre-determined electric resistance as well as a pre-determined length and thickness.
  • Said band is on the one hand in the area of its terminal portions electrically interconnected with said blade-knife contacts and is on the other hand furnished with a plurality of weak zones, which are formed as perforations in said band between both dominant surfaces thereof and arranged equidistantly along the band and each per se extend in the transversal direction of the band.
  • Each of said weak zones is formed as a plurality of throughout passages, which are equidistantly arranged in the transversal direction of the band, so that the cross-section of the melting member in each weak zone is pre-defined and is smaller than the cross-section of any other area of said melting member.
  • the interior of said casing is filled with a granulated non-flammable means i.e.
  • a filler in particular with a sand on the basis of silica, by which said melting member is surrounded.
  • said melting member is surrounded by an elastomeric sheath, which is situated toward the middle if the melting member, since most fuses "open" in the middle of the melting member.
  • Said sheath generally consists of silicone and can also extend along the entire length of the melting member.
  • a circuit-protecting fuse is disclosed in US 4,032,879 , which also comprises a tubular casing, which consists of electric insulating material and is on its both terminal portions closed by means of rigid covers. Each of said covers is furnished with a knife-blade contact, which consists of electric conductive material and is firmly connected therewith.
  • a melting member is mounted inside of said casing and is conceived as a flat band consisting of electric conductive material having a pre-determined electric resistance as well as a pre-determined length and thickness, wherein said band is on the one hand in the area of its terminal portions electrically interconnected with said blade-knife contacts and is on the other hand furnished with a plurality of weak zones.
  • arc quenching means are attached to the melting member, namely disc-formed members consisting of a very special acetal resin, which by high temperature releases a deionizing gas.
  • Such discs which are just mechanically attached to the melting member are located apart from each other and each per se surround the melting member. Consequently, gasses are released from said very special material, which also means that physical properties of such material are quickly and essentially changed, starting from the very beginning of withstanding to the effects of an electric arc.
  • Such discs appear to be able to act as thermal insulators, but cannot prevent the other arc products like flame and hot gasses from progressing along the fuse.
  • an electric fuse with knife-blade contacts is disclosed in EP 1 403 894 A1 as well as in DE 197 23 540 A1 .
  • the fuse comprises a tubular casing, which consists of an electric insulating material and is on its both terminal portions closed with rigid covers.
  • Each of said covers is furnished with a so-called knife-blade contact, which is made of an electric conductive material and is insertable into appropriate fork-shaped seat, which consists of an electric conductive material and is integrated into each electric circuit, which is protected against the electric overloading by means of said fuse.
  • a melting member is mounted within said casing between said apart from each other protruding knife-blade contacts, and is electrically interconnected with each of said contacts and surrounded with a granulated non-flammable means, in the practice usually with a sand on the basis of silica.
  • Said melting member is conceived as a relatively thin band and consists of a metallic material having a pre-determined electric resistance, and is moreover furnished with throughout passages, which are equidistantly arranged along said band and by means of which weak zones are formed due to obtaining a pre-determined cross-section of said melting member, which together with said material with a pre-defined electric resistance defines the nominal capacity of the fuse i.e.
  • the state of the art fuse is usually furnished with an indicator, by means of which interruption of the melting member can be visually detected from the outside.
  • the present invention refers to an electric fuse, which generally comprises a tubular casing, which consists of electric insulating material and is on its both terminal portions closed by means of rigid covers, wherein each of said covers is furnished with a knife-blade contact, which consists of electric conductive material and is firmly connected therewith, while a melting member is mounted inside of said casing and is conceived as a flat band consisting of electric conductive material having a pre-determined electric resistance as well as a pre-determined length and thickness, wherein said band is on the one hand in the area of its terminal portions electrically interconnected with said blade-knife contacts and is on the other hand furnished with a plurality of weak zones, which are formed as perforations in said band between both dominant surfaces thereof and arranged equidistantly along the band and each per se extend in the transversal direction of the band.
  • Each of said weak zones is formed as a plurality of throughout passages, which are equidistantly arranged in the transversal direction of the band, so that the cross-section of the melting member in each weak zone is pre-defined and is smaller than the cross-section of any other area of said melting member, and at the same time the interior of said casing is filled with a granulated non-flammable means, in particular with a sand on the basis of silica, by which said melting member is surrounded.
  • At least one barrier is arranged, which consists of a flexible and at least short-term thermally resistant material and which is adapted to prevent progression of the electric arc and extends along each of said dominant surfaces in the transversal direction of said melting member along the complete width thereof.
  • At least one further barrier consisting of flexible and at least short-term thermally resistant material is arranged on both apart from each other facing dominant surfaces of the melting member between at least two further weak zones thereof.
  • a pre-determined distance between each of the terminal barriers, which are arranged closest to the belonging knife-blade contacts, and each knife-blade contact, is at least approximately 15% of the length of the melting member. It is particularly preferred, if in addition to said terminal barriers at least one barrier is available between each pair of each neighboring weak zones of the melting member.
  • each barrier has approximately semi-circular profile with a diameter of 2 - 6 mm, preferably 3 - 4 mm, and consists of silicone, which is shortly thermally resistant up to 2000°C.
  • the electric fuse as shown in Fig. 1 and 2 comprises a tubular casing 1, which consists of electric insulating material, in this particular case of ceramics.
  • Said casing 1 is on its both terminal portions 11, 12 closed by means of rigid covers 21, 22, which are in the shown embodiment made of relatively thick metallic plates.
  • Each of said covers 21, 22 is furnished with a knife-blade contact 210, 220, which consists of electric conductive material and is firmly connected with it, wherein said knife-blade contacts 210, 220 are arranged to extend along the central geometric axis of said casing 1 of the fuse and protrude apart from each other.
  • a melting member 3 is mounted inside of said casing 1 and is conceived as a flat band consisting of electric conductive material having a pre-determined electric resistance as well as a pre-determined length L ( Fig. 1 ) and thickness, wherein said band is on the one hand in the area of its terminal portions 31, 32 electrically interconnected with said blade-knife contacts 210, 220 and on the other hand furnished with a plurality of weak zones 30, 30', 30", which are arranged equidistantly along the band and each per se extend in the transversal direction of the band. Thickness of said band is usually between 0,04 and 0,24 mm.
  • Said weak zones 30, 30', 30" are similarly like in the state of the art fuses available as perforations on said band extending between both dominant surfaces 33, 34 thereof, and each of said weak zones 30, 30', 30" is formed as a plurality of throughout passages 300, which are equidistantly arranged in the transversal direction of the band. Consequently, the cross-section of the melting member 3 in each weak zone 30, 30', 30" is pre-defined and is smaller than the cross-section of any other area of said melting member 3.
  • the interior of said casing 1 is filled with a granulated non-flammable means 4, in particular with sand on the basis of silica, by which said melting member 3 is surrounded.
  • each barrier 51, 51', 51"; 52, 52', 52" is arranged, which is adapted to prevent progression of the electric arc and extends along each of said dominant surfaces 33, 34 in the transversal direction of said melting member 3 along the complete width thereof, and which consists of flexible and shortly thermally resistant material.
  • At least one further barrier 51, 51', 51"; 52, 52', 52" consisting of flexible and shortly thermally resistant material is arranged on both apart from each other facing dominant surfaces 33, 34 of the melting member 3 between at least two further weak zones 30, 30', 30" thereof.
  • a pre-determined distance T between each of the terminal barriers 51, 51', 51"; 52, 52', 52", which are arranged closest to the belonging knife-blade contacts 210, 220, and each knife-blade contact 210, 220, should be approximately 15% of the length L of the melting member 3.
  • a further embodiment of the fuse provides that in addition to said terminal barriers 51, 51', 51"; 52, 52', 52" at least one barrier 51, 51', 51"; 52, 52', 52" is available between each pair of each neighboring weak zones 30, 30', 30" of the melting member 3.
  • each barrier 51, 51', 51"; 52, 52', 52" has approximately semi-circular profile, wherein the diameter D of each barrier 51, 51', 51"; 52, 52', 52" should be 2 - 6 mm, preferably 3 - 4 mm.
  • Each barrier 51, 51', 51"; 52, 52', 52" consists of silicone, which is at shortly thermally resistant up to 2000°C.
  • a material, which is suitable for producing said barriers 51', 51"; 52, 52', 52" is at present commercially available under the commercial name »3M Fire Barrier 2000+ « or »FIRESTOP «, and is actually a silicone with added aluminium trihydrate Al(OH) 3 and/or boron nitride BN.

Landscapes

  • Fuses (AREA)
EP14835723.9A 2014-10-24 2014-12-05 Electric fuse Active EP3210231B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14835723T PL3210231T3 (pl) 2014-10-24 2014-12-05 Elektryczny bezpiecznik topikowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI201400387A SI24871B (sl) 2014-10-24 2014-10-24 Električna varovalka
PCT/SI2014/000072 WO2016064352A1 (en) 2014-10-24 2014-12-05 Electric fuse

Publications (2)

Publication Number Publication Date
EP3210231A1 EP3210231A1 (en) 2017-08-30
EP3210231B1 true EP3210231B1 (en) 2020-07-01

Family

ID=52469268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14835723.9A Active EP3210231B1 (en) 2014-10-24 2014-12-05 Electric fuse

Country Status (6)

Country Link
EP (1) EP3210231B1 (pt)
ES (1) ES2819289T3 (pt)
PL (1) PL3210231T3 (pt)
PT (1) PT3210231T (pt)
SI (1) SI24871B (pt)
WO (1) WO2016064352A1 (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019005664A1 (de) * 2019-06-25 2020-12-31 Siba Fuses Gmbh Schmelzleiter sowie Sicherung
FR3113180B1 (fr) * 2020-07-29 2022-08-05 Mersen France Sb Sas Fusible et procédé de fabrication associé

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996041360A1 (en) * 1995-06-07 1996-12-19 Littelfuse, Inc. Form fitting arc barrier for fuse links

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496704A (en) * 1945-03-15 1950-02-07 Westinghouse Electric Corp Circuit interrupter
US4032879A (en) * 1975-11-18 1977-06-28 Teledyne, Inc. Circuit-protecting fuse having arc-extinguishing means
US20080122571A1 (en) * 2006-11-28 2008-05-29 Emerson Electric Co. Fulgurite reducing fuse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996041360A1 (en) * 1995-06-07 1996-12-19 Littelfuse, Inc. Form fitting arc barrier for fuse links

Also Published As

Publication number Publication date
PT3210231T (pt) 2020-10-07
WO2016064352A1 (en) 2016-04-28
PL3210231T3 (pl) 2020-12-14
EP3210231A1 (en) 2017-08-30
SI24871B (sl) 2020-11-30
ES2819289T3 (es) 2021-04-15
SI24871A (sl) 2016-04-29

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