EP4107769A1 - Fuse having outer and inner end caps - Google Patents

Fuse having outer and inner end caps

Info

Publication number
EP4107769A1
EP4107769A1 EP21715960.7A EP21715960A EP4107769A1 EP 4107769 A1 EP4107769 A1 EP 4107769A1 EP 21715960 A EP21715960 A EP 21715960A EP 4107769 A1 EP4107769 A1 EP 4107769A1
Authority
EP
European Patent Office
Prior art keywords
end caps
core
housing
inner end
fuse
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
EP21715960.7A
Other languages
German (de)
French (fr)
Other versions
EP4107769B1 (en
Inventor
Rafa BUCZKO
Grzegorz JAROSZEWSKI
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz 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 ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of EP4107769A1 publication Critical patent/EP4107769A1/en
Application granted granted Critical
Publication of EP4107769B1 publication Critical patent/EP4107769B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01H85/0411—Miniature fuses
    • H01H85/0415—Miniature fuses cartridge type
    • H01H85/0418—Miniature fuses cartridge type with ferrule type 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/143—Electrical contacts; Fastening fusible members to such contacts
    • H01H85/157—Ferrule-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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/18—Casing fillings, e.g. powder

Definitions

  • the invention relates to a fuse for protection of electrical devices, in particular transformers, voltage transformers, electric motors, capacitor banks and electronic devices.
  • Electric fuses which use an arc-extinguishing material after the fuse element has melted are known in the art.
  • Currently known solutions allow such devices to be constructed, but they are not without disadvantages.
  • the inconveniences include mainly the risk of spilling out the arc-extinguishing material and the excess of free space inside the fuse.
  • the fuses contain intermediate elements between the core and outer end caps, which complicate the structure and assembly of the fuse.
  • binders in the form of an adhesive or mortar are often used, thus generating additional costs due to material consumption and complexity of the technological process.
  • US8937524B2 discloses a fuse which has no intermediate parts.
  • the disclosed fuse includes a housing, inner and outer end caps located at the ends of the housing, with the outer end caps being press-fitted onto the inner end caps.
  • the inner end caps have an opening that allows a fuse element to pass, which fuse element consists of a core and a wound conductor.
  • Each of the two ends of the conductor is placed between the inner and the outer end cap, for both ends of the housing, respectively.
  • the conductor is held in place by a clamp, and the contact between the components is provided by electrical conductivity. No soldering is used for additional fixation of the conductor.
  • the disclosed solution does not solve all the problems presented above, therefore it was necessary to develop a solution that would be free from the disadvantages mentioned above.
  • the present invention relates to a fuse comprising a cylindrical housing, a core with a fuse element wound thereon, two inner end caps and two outer end caps.
  • the inner end caps and the outer end caps are cylindrical in shape with one base, wherein the inner end caps are located on both ends of the housing, and the outer end caps are located on the inner end caps.
  • the inner end caps have openings in the axis of the housing.
  • the housing and the core are made of an electrically non-conductive material, while the inner end caps, the outer end caps and the fuse element are made of an electrically conductive material.
  • the space between the core and the housing is filled with an arc-extinguishing material.
  • the fuse is characterized in that it has electrically non-conductive inserts and two end caps of the core made of an electrical conductor.
  • the end caps of the core are basically cylindrical in shape with a single base, wherein the base includes an opening in the axis of the housing.
  • the end caps of the core include an arm.
  • the core is located between the bases of the inner end caps inside the housing.
  • the end caps of the core are put on the both ends of the core.
  • the fuse element is connected to the end caps of the core, and each of the end caps of the core is affixed through an arm to the corresponding inner end cap.
  • An insert is provided between each inner end cap and the outer end cap.
  • the cross section of the core is star-shaped, preferably with three or five points.
  • the housing is made of porcelain.
  • the core is made of porcelain.
  • the insert is made of cardboard, preferably pressboard.
  • the end cap of the core is welded or soldered to the inner end cap.
  • a rating plate is provided on the housing.
  • the housing has a smaller diameter at the end portions than at the central portion.
  • the arc-extinguishing material is sand.
  • Fig. 1 - shows a longitudinal section of the fuse.
  • Fig. 2a and 2b - show a cross section of the fuse.
  • the fuse includes a cylindrical housing 3 which comprises inside a core 1 with a fuse element wound thereon (not shown). To facilitate assembly, the housing 3 may have a smaller diameter at the end portions than at the central portion.
  • the core 1 and the housing 3 are made of an electrically non-conductive material, preferably of porcelain.
  • the fuse element is made of an easily fusible electrically conductive material, wherein the specific material or diameter is selected each time the fuse is designed for required voltages and currents.
  • the end caps 2 of the core 1 made of an electrically conductive material, are placed on both ends of the core 1, wherein the fuse element is connected to the end caps 2 of the core 1.
  • the end caps 2 of the core 1 are press-fitted and are held on the core 1 due to the frictional forces.
  • the end caps 2 of the core 1 are basically cylindrical in shape with a single base which has an opening in the axis of the housing 3.
  • the end caps 2 of the core 1 further comprise an arm 2a.
  • the inner end caps 4 are placed on the housing 3, one on each of the two ends of the housing 3.
  • the inner end caps 4 are press-fitted onto the housing 3.
  • the inner end caps 4 further include openings, which in an assembled fuse are located in the axis of the casing 3. These openings are used for pouring in an arc-extinguishing material, which fills the space between the corel and the housing 3. These openings also allow the fuse element to be electrically connected to the electrically conductive outer components of the fuse.
  • the arm 2a of the end cap 2 of the core 1 is affixed to the inner end cap 4, preferably by soldering or welding. This connection ensures low resistance and a secure connection.
  • the inserts 6 are placed on the inner end caps 4.
  • the inserts 6 are made of an electrically non-conductive material such as cardboard or pressboard.
  • the inner end caps 4 and the outer end caps 5 are cylindrical in shape with a single base.
  • the inner end caps 4, the outer end caps 5 and the fuse element are made of an electrically conductive material.
  • the core 1 is located between the bases of the inner end caps 4.
  • a rating plate 7 is placed on the housing 3.
  • Fig. 2 shows a cross section of the fuse.
  • the cross-section of the core 1 may be star-shaped, preferably with three points, as in Fig. 2B, or with five points, as in Fig. 2A.

Landscapes

  • Fuses (AREA)

Abstract

The invention relates to a fuse comprising electrically non-conductive inserts (6) and two end caps (2) of the core (1) made of an electrical conductor, wherein the end caps (2) of the core (1) are basically cylindrical in shape with a single base which includes an opening in the axis of the housing (3), and the end caps (2) of the core (1) include an arm (2a), wherein the core (1) is located between the bases of the inner end caps (4) inside the housing (3), wherein the end caps (2) of the core (1) are put on the both ends of the core (1), wherein the fuse element is connected to the end caps (2) of the core (1), and each of the end caps (2) of the core (1) is affixed through an arm (2a) to the corresponding inner end cap (4), and an insert (6) is provided between each inner end cap (4) and the outer end cap (5).

Description

FUSE HAVING OUTER AND INNER END CAPS
Technical field
The invention relates to a fuse for protection of electrical devices, in particular transformers, voltage transformers, electric motors, capacitor banks and electronic devices.
Background
Electric fuses which use an arc-extinguishing material after the fuse element has melted are known in the art. Currently known solutions allow such devices to be constructed, but they are not without disadvantages. The inconveniences include mainly the risk of spilling out the arc-extinguishing material and the excess of free space inside the fuse. In addition, the fuses contain intermediate elements between the core and outer end caps, which complicate the structure and assembly of the fuse. Further, binders in the form of an adhesive or mortar are often used, thus generating additional costs due to material consumption and complexity of the technological process.
US8937524B2 discloses a fuse which has no intermediate parts. The disclosed fuse includes a housing, inner and outer end caps located at the ends of the housing, with the outer end caps being press-fitted onto the inner end caps. The inner end caps have an opening that allows a fuse element to pass, which fuse element consists of a core and a wound conductor. Each of the two ends of the conductor is placed between the inner and the outer end cap, for both ends of the housing, respectively. The conductor is held in place by a clamp, and the contact between the components is provided by electrical conductivity. No soldering is used for additional fixation of the conductor. The disclosed solution does not solve all the problems presented above, therefore it was necessary to develop a solution that would be free from the disadvantages mentioned above.
Summary of the invention
The present invention relates to a fuse comprising a cylindrical housing, a core with a fuse element wound thereon, two inner end caps and two outer end caps. The inner end caps and the outer end caps are cylindrical in shape with one base, wherein the inner end caps are located on both ends of the housing, and the outer end caps are located on the inner end caps. The inner end caps have openings in the axis of the housing. The housing and the core are made of an electrically non-conductive material, while the inner end caps, the outer end caps and the fuse element are made of an electrically conductive material. The space between the core and the housing is filled with an arc-extinguishing material. The fuse is characterized in that it has electrically non-conductive inserts and two end caps of the core made of an electrical conductor. The end caps of the core are basically cylindrical in shape with a single base, wherein the base includes an opening in the axis of the housing. The end caps of the core include an arm. The core is located between the bases of the inner end caps inside the housing. The end caps of the core are put on the both ends of the core. The fuse element is connected to the end caps of the core, and each of the end caps of the core is affixed through an arm to the corresponding inner end cap. An insert is provided between each inner end cap and the outer end cap.
Preferably, the cross section of the core is star-shaped, preferably with three or five points. Preferably, the housing is made of porcelain.
Preferably, the core is made of porcelain.
Preferably, the insert is made of cardboard, preferably pressboard.
Preferably, the end cap of the core is welded or soldered to the inner end cap.
Preferably, a rating plate is provided on the housing.
Preferably, the housing has a smaller diameter at the end portions than at the central portion. Preferably, the arc-extinguishing material is sand.
Brief description of the Figures
The invention is illustrated in the embodiment in the drawing, wherein:
Fig. 1 - shows a longitudinal section of the fuse.
Fig. 2a and 2b - show a cross section of the fuse.
Detailed description of preferred embodiment of the invention The fuse of the present solution will now be described in more detail with reference to Fig. 1, which shows a longitudinal section of a preferred embodiment of the fuse. The fuse includes a cylindrical housing 3 which comprises inside a core 1 with a fuse element wound thereon (not shown). To facilitate assembly, the housing 3 may have a smaller diameter at the end portions than at the central portion. The core 1 and the housing 3 are made of an electrically non-conductive material, preferably of porcelain. The fuse element is made of an easily fusible electrically conductive material, wherein the specific material or diameter is selected each time the fuse is designed for required voltages and currents.
The end caps 2 of the core 1, made of an electrically conductive material, are placed on both ends of the core 1, wherein the fuse element is connected to the end caps 2 of the core 1. The end caps 2 of the core 1 are press-fitted and are held on the core 1 due to the frictional forces. The end caps 2 of the core 1 are basically cylindrical in shape with a single base which has an opening in the axis of the housing 3. The end caps 2 of the core 1 further comprise an arm 2a.
Two inner end caps 4 are placed on the housing 3, one on each of the two ends of the housing 3. The inner end caps 4 are press-fitted onto the housing 3. The inner end caps 4 further include openings, which in an assembled fuse are located in the axis of the casing 3. These openings are used for pouring in an arc-extinguishing material, which fills the space between the corel and the housing 3. These openings also allow the fuse element to be electrically connected to the electrically conductive outer components of the fuse.
The arm 2a of the end cap 2 of the core 1 is affixed to the inner end cap 4, preferably by soldering or welding. This connection ensures low resistance and a secure connection.
After the arc-extinguishing material, preferably being sand, is put in place, the inserts 6 are placed on the inner end caps 4. The inserts 6 are made of an electrically non-conductive material such as cardboard or pressboard.
Then, an outer end cap 5 is placed on each inner end cap 4, to press the insert 6. The outer end cap 5 is press-fitted and held in place by the frictional forces. The inner end caps 4 and the outer end caps 5 are cylindrical in shape with a single base. The inner end caps 4, the outer end caps 5 and the fuse element are made of an electrically conductive material.
In an assembled fuse, the core 1 is located between the bases of the inner end caps 4. Preferably, a rating plate 7 is placed on the housing 3. Fig. 2 shows a cross section of the fuse. The cross-section of the core 1 may be star-shaped, preferably with three points, as in Fig. 2B, or with five points, as in Fig. 2A.
Parts list:
1 - core
2 - end cap of the core
3 - housing
4 - inner end cap
5 - outer end cap
6 - insert
7 - rating plate

Claims

Claims
1. A fuse comprising a cylindrical housing, a core with a fuse element wound thereon, two inner end caps and two outer end caps, wherein the inner end caps and the outer end caps are cylindrical in shape with one base, wherein the inner end caps are located on both ends of the housing, and the outer end caps are located on the inner end caps, wherein the inner end caps have openings in the axis of the housing, wherein the housing and the core are made of an electrically non-conductive material, while the inner end caps, the outer end caps and the fuse element are made of an electrically conductive material, and furtherthe space between the core and the housing is filled with an arc-extinguishing material, characterized in that it further comprises electrically non-conductive inserts (6) and two end caps (2) of the core (1) made of an electrical conductor, wherein the end caps (2) of the core (1) are basically cylindrical in shape with a single base, wherein the base includes an opening in the axis of the housing (3), and the end caps (2) of the core (1) include an arm (2a), wherein the core (1) is located between the bases of the inner end caps (4) inside the housing (3), wherein the end caps (2) of the core (1) are put on the both ends of the core (1), wherein the fuse element is connected to the end caps (2) of the core (1), and each of the end caps (2) of the core (1) is affixed through an arm (2a) to the corresponding inner end cap (4), wherein an insert (6) is provided between each the inner end cap (4) and the outer end cap (5).
2. The fuse according to claim 1, characterized in that the cross section of the core (1) is star-shaped, preferably with three or five points.
3. The fuse according to claim 1 or 2, characterized in that the housing (3) is made of porcelain.
4. The fuse according to any claim 1-3, characterized in that the core (1) is made of porcelain.
5. The fuse according to any claim 1-4, characterized in that the insert (6) is made of cardboard, preferably pressboard.
6. The fuse according to any claim 1-5, characterized in that the end cap (2) of the core (1) is welded or soldered to the inner end cap (4).
7. The fuse according to any claim 1-6, characterized in that a rating plate (7) is provided on the housing (3).
8. The fuse according to any claim 1-7, characterized in that the housing (3) has a smaller diameter at the end portions than at the central portion.
9. The fuse according to any claim 1-8, characterized in that the arc-extinguishing material is sand.
EP21715960.7A 2020-02-18 2021-02-18 Fuse having outer and inner end caps Active EP4107769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL432932A PL239797B1 (en) 2020-02-18 2020-02-18 Fuse
PCT/IB2021/051369 WO2021165867A1 (en) 2020-02-18 2021-02-18 Fuse having outer and inner end caps

Publications (2)

Publication Number Publication Date
EP4107769A1 true EP4107769A1 (en) 2022-12-28
EP4107769B1 EP4107769B1 (en) 2023-09-06

Family

ID=75340002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21715960.7A Active EP4107769B1 (en) 2020-02-18 2021-02-18 Fuse having outer and inner end caps

Country Status (4)

Country Link
EP (1) EP4107769B1 (en)
CN (1) CN115398587A (en)
PL (1) PL239797B1 (en)
WO (1) WO2021165867A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1052950A (en) * 1912-05-24 1913-02-11 James Howard Palmer Fuse.
GB648077A (en) * 1948-11-17 1950-12-28 Kenneth Eardley Beswick Improvements in or relating to electric cartridge fuses
GB1331669A (en) * 1971-09-02 1973-09-26 Takamatsu Electric Works Ltd Fuse element and a high voltage current-limitting fuse
US8937524B2 (en) * 2009-03-25 2015-01-20 Littelfuse, Inc. Solderless surface mount fuse
US8081057B2 (en) * 2009-05-14 2011-12-20 Hung-Chih Chiu Current protection device and the method for forming the same
US8471671B2 (en) * 2010-09-17 2013-06-25 Cooper Technologies Company Fuse and arc resistant end cap assembly therefor

Also Published As

Publication number Publication date
EP4107769B1 (en) 2023-09-06
CN115398587A (en) 2022-11-25
WO2021165867A1 (en) 2021-08-26
PL432932A1 (en) 2021-08-23
PL239797B1 (en) 2022-01-10

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