EP4107769A1 - Sicherung mit äusseren und inneren endkappen - Google Patents
Sicherung mit äusseren und inneren endkappenInfo
- 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
Links
- 239000004020 conductor Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 10
- 229910052573 porcelain Inorganic materials 0.000 claims description 5
- 239000012811 non-conductive material Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000005476 soldering Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL432932A PL239797B1 (pl) | 2020-02-18 | 2020-02-18 | Bezpiecznik |
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 (de) | 2022-12-28 |
EP4107769B1 EP4107769B1 (de) | 2023-09-06 |
Family
ID=75340002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21715960.7A Active EP4107769B1 (de) | 2020-02-18 | 2021-02-18 | Sicherung mit äusseren und inneren endkappen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4107769B1 (de) |
CN (1) | CN115398587A (de) |
PL (1) | PL239797B1 (de) |
WO (1) | WO2021165867A1 (de) |
Family Cites Families (4)
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 |
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 |
-
2020
- 2020-02-18 PL PL432932A patent/PL239797B1/pl unknown
-
2021
- 2021-02-18 WO PCT/IB2021/051369 patent/WO2021165867A1/en unknown
- 2021-02-18 CN CN202180028902.4A patent/CN115398587A/zh active Pending
- 2021-02-18 EP EP21715960.7A patent/EP4107769B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
PL432932A1 (pl) | 2021-08-23 |
WO2021165867A1 (en) | 2021-08-26 |
EP4107769B1 (de) | 2023-09-06 |
PL239797B1 (pl) | 2022-01-10 |
CN115398587A (zh) | 2022-11-25 |
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