EP4423784A1 - Kontaktträger, kontaktträgeranordnung und niederspannungs-schutzschaltgerät - Google Patents
Kontaktträger, kontaktträgeranordnung und niederspannungs-schutzschaltgerätInfo
- Publication number
- EP4423784A1 EP4423784A1 EP22812617.3A EP22812617A EP4423784A1 EP 4423784 A1 EP4423784 A1 EP 4423784A1 EP 22812617 A EP22812617 A EP 22812617A EP 4423784 A1 EP4423784 A1 EP 4423784A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- contact carrier
- carrier
- contacting surface
- contact element
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
- H01H1/0231—Composite material having a noble metal as the basic material provided with a solder layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/20—Bridging contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
- H01H11/045—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion with the help of an intermediate layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
- H01H73/045—Bridging contacts
Definitions
- the invention relates to a contact carrier for fastening a contact element of a low-voltage protective switching device by means of a soldering process, so that a layer of solder is formed between the contact carrier and the contact element. Furthermore, the invention relates to a contact carrier arrangement with a contact carrier and a contact element attached thereto by soldering, and a low-voltage protective switching device with such a contact carrier and/or such a contact carrier arrangement.
- Electromechanical low-voltage protective switching devices for example circuit breakers, miniature circuit breakers of various current classes such as MCB (miniature circuit breaker), MCCB (moulded case circuit breaker) or ACB (air circuit breaker), but also industrial low-voltage protective switching devices such as motor protection switches and contactors or soft starters have at least one switching contact, with the help of which the circuit monitored by the respective low-voltage protective switching device can be interrupted if a predefined condition occurs, for example a short circuit or a thermal overload.
- two contact elements of the switching contact are separated from one another, usually by moving a movable contact element away from a contact element fixed in the housing of the protective switching device.
- switching contact means both simple switching contacts with only one contact point and double-breaking switching contacts, for example bridge contacts, in which the current flow on two contacts electrically connected in series is controlled by a contact bridge on which two movable contact elements are arranged are, is interrupted.
- the actual contact element is usually made from a silver alloy, as these have good electrical conductivity.
- the contact carriers ie the components on which the contact elements are attached and which must have a certain strength, are not made of silver but of copper or steel.
- contact carrier is to be understood both as a stationary contact carrier arranged in a housing of the protective switching device, so-called fixed contact carrier, and as a contact carrier that can be moved in the housing, so-called moving contact carrier.
- a soldering method for example resistance soldering, is generally used as the joining method for fastening the mostly cuboid contact elements on the respective contact carrier, in order to obtain good strength of the joint connection despite the lower joining temperature. It can happen that the solder mass, which is intended to connect to both parts to be joined as an intermediate layer between the contact carrier and the contact element and should thus form a stable joint, protrudes laterally under the contact element and on the side surfaces of the contact element rises. Since this can have a negative impact on the process safety of the joining process and the reliability of the joint - and thus the reliability of the low-voltage protective switching device - this so-called solder rise should be avoided or kept as low as possible.
- the contact carrier according to the invention is used to attach a contact element of a low-voltage protective switching device by means of a soldering process, so that a solder layer is formed between the contact carrier and the contact element, and has a contacting surface for the solder layer, which in turn has a rough surface structure and through a first groove-like recess is limited.
- two contact elements can also be arranged on a contact carrier. Irrespective of the number of contact elements, when the contact element is joined to the contact carrier by means of resistance soldering, the underside of the contact element is generally first coated with the solder. The underside of the contact element is then placed on the contacting surface formed on the contact carrier and heated by means of an electric current. Due to the rough surface structure, which can be produced, for example, by rough planing or embossing, the contacting surface has a large number of small indentations, which serve as solder depots into which the solder, which liquefies as a result of heating, can run.
- the first groove-like indentation which delimits the contacting surface and can also be produced by embossing, also serves as a further solder depot, i.e. as a storage volume into which excess solder material can flow in order to prevent the solder material from rising on one or more of the side surfaces of the contact element to avoid.
- the bonding portion of the soldered connection i.e. the portion of the surface connected by the soldered connection, is significantly increased. In this way, the flow behavior of the solder material can be influenced in a targeted manner during the soldering process, so that the solder rise can be significantly reduced.
- the quality of the joint connection - and thus the reliability of the joining process - is significantly improved as a result of which the probability of failure of the low-voltage protective switching device can be significantly reduced.
- the contacting surface is essentially rectangular in shape and has a second groove-like indentation which runs in the shape of a crescent from a first corner to an adjacent second corner of the rectangular contacting surface.
- the second groove-like depression can be produced, for example, by embossing. With their help, it is possible to direct the flow of solder, ie the liquefied solder material, from the center of the rectangular contacting surface in the direction of the corners—and thus into the first groove-like depression that surrounds the contacting surface. In this way, the rising of the solder, ie the rising of the solder material on the side surfaces of the contact element, can be significantly reduced.
- the geometry of the second groove-like indentation is adapted to the conditions of the respective contact carrier arrangement, ie to the interaction of a respective contact carrier with a respective contact element, adaptable.
- the contacting surface has a third groove-like indentation which runs in a crescent shape from a third corner to an adjacent fourth corner of the rectangular contacting surface.
- the effect of the second groove-like indentation to limit the rising of the solder is further enhanced by the third groove-like indentation.
- the second and the third groove-like indentation can be arranged symmetrically on the contacting surface.
- the contacting surface is completely surrounded by the first groove-like indentation.
- the contacting surface is delimited circumferentially by the first groove-like indentation and is thus surrounded without interruption, so that an escape of solder material onto the surface of the contact carrier surrounding the first groove-like indentation can be largely avoided. This further improves the reliability of the joining process.
- the contact carrier is formed from sheet metal, in particular from sheet copper.
- sheet copper enables good electrical conductivity with sufficient mechanical stability at the same time.
- copper includes both pure copper material and copper alloys.
- sheet is understood to mean a component whose lateral and horizontal dimensions are significantly greater than its vertical dimensions, i.e. the component has a relatively small thickness or height in comparison to the length and width expansion.
- the contact carrier has a rear imprint.
- the contact carrier In the region of the contacting surface, which is formed on an upper side of the contact carrier, the contact carrier has an impression on an underside of the contact carrier opposite the upper side.
- the current flow - and thus the heating zone during resistance soldering - can be specifically influenced.
- the embossing on the underside of the contact carrier can be adapted to the respective circumstances in terms of its size and contour.
- the contact carrier arrangement according to the invention for a switching contact of a low-voltage protective switching device has a contact carrier of the type described above and a contact element attached thereto by soldering, so that a solder layer is formed between the contact carrier and the contact element.
- the contact element has a bulbous upper side.
- An underside of the contact element faces the contacting surface of the contact carrier and is connected to it by soldering.
- the upper side of the contact element opposite the underside serves to make contact with a further contact element of the switching contact and is convex for this purpose, i.e. curved upwards or outwards.
- the contact element is formed from a silver alloy.
- a silver alloy for the taktelement has the advantage that silver has good electrical conductivity and the requirements for the strength of the contact element are negligible.
- the low-voltage protective switching device for example a line circuit breaker, motor circuit breaker or the like, has a contact carrier and/or a contact carrier arrangement of the type described above.
- FIG. 1 and 2 schematic representations of a first exemplary embodiment of a contact carrier arrangement
- FIG. 5 and 6 are schematic representations of a first exemplary embodiment of the contact carrier according to the invention.
- FIG. 7 shows a schematic representation of a second exemplary embodiment of the contact carrier according to the invention
- FIG. 8 shows a schematic representation of a third exemplary embodiment of the contact carrier according to the invention
- FIGS. 1 and 2 a first exemplary embodiment of a contact carrier arrangement 1 is shown schematically in plan and elevation.
- the contact carrier arrangement 1 has a contact carrier 10 on which a substantially cuboid contact element 20 is fastened.
- the contact element 20 is placed on a contacting surface 13 provided for this purpose (see Figures 5ff) of the contact carrier 10 and bonded by soldering, so that a flat layer of solder 21 is formed between the contacting surface 13 of the contact carrier 10 and the contact element 20.
- the contact carrier 10 has electrically conductive material - for example steel, copper or a combination of both materials, for example copper-clad sheet steel or copper galvanically applied to sheet steel - and can be produced, for example, by stamping.
- the contact element 20 is preferably formed from a silver alloy. Since both the contact carrier 10 and the contact element 20 are electrically conductive, resistance soldering is preferably used as the soldering method for connecting the two joining partners—the contact element 20 and the contact carrier 10 . In order to accommodate excess solder material, the contact carrier 10 also has a first groove-like depression 14 on, which limits the contacting surface 13 to the outside.
- a second embodiment of the contact carrier assembly 1 is shown schematically in plan and elevation. This is a so-called bridge contact with two switching points electrically connected in series, in which two contact elements 20 are correspondingly fastened to the movably mounted contact carrier 10 by means of soldering.
- the contact element 20 which is illustrated as essentially cuboid, has an underside via which it is connected to an upper side 11 of the contact carrier 10 .
- An upper side of the contact element 20 opposite the underside is designed as a flat surface oriented parallel to the upper side 21 in the representations of FIGS. However, this is not mandatory; it is also possible for the upper side of the contact element 20 to be crowned, i.e. curved upwards, i.e. convex.
- FIGS. 5 and 6 show schematic representations of a first exemplary embodiment of the contact carrier 10, with FIG. 5 showing a plan view of the contact carrier 10, while FIG. 6 schematically shows a sectional view along the section line A-A drawn in FIG.
- the contact carrier 10 has a sheet-like shape, ie its length and width extent in a first direction x and a second direction y is significantly greater than its Dieken extent in a third direction z.
- the contact carrier 10 consists of an electrically conductive material and can be produced, for example, by stamping.
- At the top 11 of the contact carrier 10 is essentially rectangular contacting surface 13 for contacting the contact element 20 is formed.
- the contacting surface 13 has a rough surface structure, which can be produced, for example, by embossing or rough planing, and is delimited by the first groove-like depression 14, which completely surrounds the contacting surface 13.
- FIG. 7 also shows a sectional view along the section line A-A drawn in FIG. 5—however, the contact carrier 10 shown here has an indentation 17 on its underside 12 opposite the top 11, which is formed on the back in the region of the contacting surface 13.
- the impression 17 which can be adapted in terms of size and shape to the variant of a low-voltage protective switching device to be formed, the electrical current flowing through the contact carrier--and thus through the contact arrangement--during resistance soldering can be targeted to be influenced. In this way, the rise in solder on the sides of the contact element 20 can be reduced.
- a third exemplary embodiment of the contact carrier 10 according to the invention is shown schematically in FIG.
- the representation of the contact carrier 10 essentially corresponds to the representation described above for FIG.
- the two groove-like depressions 15 and 16 are arranged symmetrically to one another and each run in the shape of a sickle from one corner to an adjacent corner of the rectangular contacting surface 13, each spanning over one of the longitudinal sides of the rectangular contacting surface 13.
- the second and third groove-shaped indentations can also be produced by embossing or rough planing and are used to direct the flow of solder away from the sides towards the corners of the contacting surface 13 in order to prevent or at least reduce a rise in solder on the sides of the contact element 20 to reduce.
- the width and the curvature of the two crescent-shaped, groove-like depressions 15 and 16 can be adapted to the respective switching device type in terms of their size and contour.
- the embodiment shown in FIG. 8 can be realized with or without an embossing on the back according to the illustrations in FIGS.
- the contacting surface 13 has a first and a second groove-like indentation; however, it is also possible to provide the contacting surface 13 with only one of the two crescent-shaped, groove-like depressions 15 or 16.
- Figures 9 and 10 schematically show further exemplary embodiments of the contact carrier 10 according to the embodiment already known from Figures 3 and 4 as a bridge contact in plan, i.e. with a view of the top 11 of the contact carrier 10.
- Figure 9 shows the as Contact carrier 10 designed as a bridge contact with two contacting surfaces 13 which are each surrounded by a first groove-like depression 14 .
- the underside 12 (see FIGS. 6 and 7) can be designed with or without an embossing 17 .
- FIG. 10 shows the contact carrier 10 designed as a bridge contact, with the two contacting surfaces 13 each having the two crescent-shaped groove-like depressions 15 and 16 in addition to the first groove-like depression 14 .
- the underside 12 can be designed with or without an indentation 17 .
- the contacting surface 13 has a rough surface structure, the first groove-like depression 14 and the two Crescent-shaped, groove-like depressions 15 and 16, the rise in the solder can be significantly reduced.
- the geometric design of these design measures can be adapted to the particular circumstances of the respective switching device type.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Contacts (AREA)
- Thyristors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022200192.3A DE102022200192A1 (de) | 2022-01-11 | 2022-01-11 | Kontaktträger, Kontaktträgeranordnung und Niederspannungs-Schutzschaltgerät |
| PCT/EP2022/080670 WO2023134896A1 (de) | 2022-01-11 | 2022-11-03 | Kontaktträger, kontaktträgeranordnung und niederspannungs-schutzschaltgerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4423784A1 true EP4423784A1 (de) | 2024-09-04 |
| EP4423784B1 EP4423784B1 (de) | 2025-09-03 |
Family
ID=84362020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22812617.3A Active EP4423784B1 (de) | 2022-01-11 | 2022-11-03 | Kontaktträger, kontaktträgeranordnung und niederspannungs-schutzschaltgerät |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250104936A1 (de) |
| EP (1) | EP4423784B1 (de) |
| CN (1) | CN118511243A (de) |
| DE (1) | DE102022200192A1 (de) |
| WO (1) | WO2023134896A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2298999A (en) * | 1940-08-03 | 1942-10-13 | Square D Co | Electrical contact |
| US2759074A (en) * | 1952-10-16 | 1956-08-14 | Square D Co | Electric contact mounting |
| US4530815A (en) | 1982-06-29 | 1985-07-23 | Mitsubishi Denki Kabushiki Kaisha | Method of producing a contact device for a switch |
| CN202650859U (zh) | 2012-07-09 | 2013-01-02 | 浙江天银合金技术有限公司 | 触头 |
| DE102015100732A1 (de) | 2015-01-20 | 2016-07-21 | Phoenix Contact Gmbh & Co. Kg | Stromkontakt für eine schaltvorrichtung |
| EP3116009B1 (de) * | 2015-07-07 | 2019-08-28 | Siemens Aktiengesellschaft | Verfahren zur herstellung eines elektrischen schaltkontakts |
| DE102020116474A1 (de) * | 2020-06-23 | 2021-12-23 | Strunk Connect automated solutions GmbH & Co. KG | Verfahren zur Herstellung einer spaltfreien und kraftschlüssigen Verbindung |
-
2022
- 2022-01-11 DE DE102022200192.3A patent/DE102022200192A1/de active Pending
- 2022-11-03 CN CN202280088233.4A patent/CN118511243A/zh active Pending
- 2022-11-03 US US18/728,169 patent/US20250104936A1/en active Pending
- 2022-11-03 WO PCT/EP2022/080670 patent/WO2023134896A1/de not_active Ceased
- 2022-11-03 EP EP22812617.3A patent/EP4423784B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP4423784B1 (de) | 2025-09-03 |
| US20250104936A1 (en) | 2025-03-27 |
| WO2023134896A1 (de) | 2023-07-20 |
| CN118511243A (zh) | 2024-08-16 |
| DE102022200192A1 (de) | 2023-07-13 |
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