EP0831510B1 - Dispositif de déclenchement thermique pour appareil de protection - Google Patents
Dispositif de déclenchement thermique pour appareil de protection Download PDFInfo
- Publication number
- EP0831510B1 EP0831510B1 EP97401850A EP97401850A EP0831510B1 EP 0831510 B1 EP0831510 B1 EP 0831510B1 EP 97401850 A EP97401850 A EP 97401850A EP 97401850 A EP97401850 A EP 97401850A EP 0831510 B1 EP0831510 B1 EP 0831510B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bimetallic strip
- plate
- foot
- triggering apparatus
- thermal triggering
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H2037/525—Details of manufacturing of the bimetals, e.g. connection to non bimetallic elements or insulating coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
- H01H71/164—Heating elements
Definitions
- the present invention relates to a triggering device thermal bimetal for an electrical overcurrent protection device, such as a thermal relay or a circuit breaker, according to the preamble of claim 1, as it is known for example from document FR-A-2 553 928.
- the role of the thermal trip device is ensure the protection of an electrical installation supplied via the device against overload currents, the temperature rise of the bimetallic strip being representative of the overload and determining, the triggering of the protective device when it reaches a threshold predetermined.
- the bimetallic strip generally has a first free end able to deform, and a second end fixed to a support sole in conductive material.
- the mounting of the bimetallic strip can be carried out by embedding the second end in a recess in the sole.
- the heating of the bimetallic strip is carried out in the usual way by passing the current in an electrically insulated heating coil, and in contact thermal with the bimetallic strip, but it can also be carried out directly by passing the running through the bimetallic strip.
- the invention therefore proposes to provide a device for bimetal thermal release without heating winding to achieve a economic gain in the manufacture of protective devices, and whose characteristics allow a tripping time greater than one normalized value.
- connection point is located at a determined distance from the face bottom of the plate, so that we can determine, by the simple choice of this distance, the calibration of the protective device.
- Figure 1 is an elevational view of the device of the invention.
- the thermal trip device illustrated in Figure 1, is intended to be integrated into an electrical protection device, for example a motor circuit breaker, to detect overload currents after a determined time.
- the thermal trip device comprises a bimetallic strip 10 which directly constitutes the heating element.
- the bimetallic strip 10 is fixed to a support plate 20; the wafer 20 is made of an electrically conductive material and is connected by a first end 21 to a conductive part of current output not shown connected to a pole circuit breaker power.
- the bimetallic strip 10 is thin, of generally elongated rectangular shape extending in a QQ 'plane. It includes a first free end 11 capable of being deform, and a second end or foot 12 intended to be electrically connected to a current input conductive part 30 connected to a connection terminal.
- the support plate 20 of generally rectangular shape, of given thickness e , extends in a plane PP 'perpendicular to the plane QQ'. It comprises in the vicinity of a second end 22 a rectangular recess 23 which extends parallel to the longitudinal direction of the wafer.
- the bimetallic strip 10 crosses the plate 20 through the recess 23, its two large opposite lateral faces 13 being located in the plane QQ 'parallel to the longitudinal direction of the wafer.
- the width of the recess 23 is adjusted to the thickness of the bimetallic strip to allow the latter to be embedded.
- the bimetallic strip has on one of its longitudinal sections 14 a shoulder 15 bearing against the upper face 20a of the plate 20 to seat the bimetallic strip on the plate.
- the position of the shoulder 15 is provided so that the foot 12 of the bimetal strip projects over a height h below the lower face 20b of the plate 20.
- the width l of the foot 12 of the bimetallic strip below the shoulder 15 is at more equal to the width l 'of the upper part 11a of the bimetallic strip situated above the brochure.
- the mechanical fixing of the bimetallic strip 10 to the plate 20 is established by welding, for example laser welding, which can be carried out at the face upper 20a of the wafer and / or at its lower face 20b.
- the welding also promotes the electrical connection between the bimetallic strip 10 and the plate 20.
- connection braid 40 The projection of the foot 12 of the bimetallic strip is electrically connected to the part conductive 30 by a connection braid 40; the braid 40 is welded on one side in an electrical connection point 16 of the foot 12 and on the other side at one end 31 of the part 30.
- the connection braid 40 can also constitute a metal strip or an extension of the conductive part 30.
- connection point 16 is chosen over the height h at a determined distance d which depends on the calibration of the electrical appliance. It is advantageously made on the foot 12 and not on the upper part 11a of the bimetallic strip so as not to damage it. The direct heating of the bimetallic strip is therefore carried out at the level of the foot 12 and of the weld made between the foot and the plate.
- the calorific power necessary for the deformation of the end 11 of the bimetallic strip remains substantially constant, it is therefore necessary to ability to modify the ohmic resistance R of the bimetallic strip as a function of the the device.
- the ohmic resistance R is all the smaller the caliber of the device, representative of the nominal current, is large.
- the resistance R can thus be modified as a function of the distance d and / or the width l of the foot 12.
- the distance d is all the smaller the higher the gauge and the width l is all the smaller as the caliber is low.
- the bimetallic strip comprises an intermediate layer of copper.
- the conductive part 30 extends in a plane perpendicular to the PP plan; it includes a rising branch 32 whose lower end 31 is connected to the connection braid 40, and a descending branch 33 whose end bent upper 34 is connected to the upper end of the rising leg 32.
- the descending branch 33 has at its lower end 35 an extension bent 36 perpendicular to the branches 32, 33 and situated parallel to the plane PP '; the extension 36 is electrically connected to a connection terminal (not shown).
- the shape of the part 30 makes it possible to obtain a temperature gradient sufficient between bimetallic strip 10 and the current input connection terminal of so that the temperature of the latter is low compared to that of the bimetallic strip.
Landscapes
- Thermally Actuated Switches (AREA)
Description
- le pied du bilame traverse l'évidement de façon à être en saillie en-dessous de la face inférieure de la plaquette d'une hauteur amplement supérieure à l'épaisseur de la plaquette;
- la saillie du pied présente un point de connexion électrique à une pièce conductrice de manière à constituer l'élément de chauffage direct du bilame.
Claims (4)
- Dispositif de déclenchement thermique, pour appareil de protection, comprenant un bilame (10) électriquement conducteur et une plaquette (20) d'épaisseur (e), servant de support au bilame, et reliée par une première extrémité (21) à une partie conductrice de sortie de courant, le bilame ayant une première extrémité libre (11) apte à se déformer et une seconde extrémité ou pied (12) encastrée dans un évidement (23) de la plaquette (20), caractérisé en ce quele pied (12) du bilame (10) traverse l'évidement (23) de façon à être en saillie en-dessous de la face inférieure (20b) de la plaquette (20) d'une hauteur (h) amplement supérieure à l'épaisseur (e) de la plaquette,la saillie du pied (12) présente un point de connexion électrique (16) à une pièce conductrice (30) de manière à constituer l'élément de chauffage direct du bilame (10).
- Dispositif de déclenchement thermique selon la revendication 1, caractérisé en ce que le point de connexion (16) est situé à une distance déterminée (d) de la face inférieure (20b) de la plaquette en fonction du calibrage de l'appareil.
- Dispositif de déclenchement thermique selon la revendication 1 ou 2, caractérisé en ce que le pied en saillie (12) présente une largeur (ℓ) au plus égale à la largeur (ℓ') de la partie supérieure (11a) du bilame située au-dessus de la plaquette de manière à former un épaulement (15) prenant appui sur la face supérieure (20a) de la plaquette lorsque le pied (12) du bilame est traversant.
- Dispositif de déclenchement thermique selon l'une quelconque des revendications précédentes, caractérisé en ce que la pièce conductrice (30) s'étend parallèlement au bilame (10), et présente une branche montante (32) dont l'extrémité inférieure (31) est reliée électriquement au point de connexion (16) et une branche descendante (33) dont l'extrémité supérieure coudée (34) est reliée à la branche montante (32), la branche decendante (33) présentant à son extrémité inférieure (35) un prolongement coudé (36) perpendiculaire aux branches (32, 33) et connecté électriquement à une borne de raccordement.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9611649A FR2753835B1 (fr) | 1996-09-23 | 1996-09-23 | Dispositif de declenchement thermique pour appareil de protection |
FR9611649 | 1996-09-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0831510A1 EP0831510A1 (fr) | 1998-03-25 |
EP0831510B1 true EP0831510B1 (fr) | 2001-10-17 |
Family
ID=9496035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97401850A Expired - Lifetime EP0831510B1 (fr) | 1996-09-23 | 1997-07-31 | Dispositif de déclenchement thermique pour appareil de protection |
Country Status (4)
Country | Link |
---|---|
US (1) | US5844466A (fr) |
EP (1) | EP0831510B1 (fr) |
DE (1) | DE69707387T2 (fr) |
FR (1) | FR2753835B1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6445274B1 (en) * | 2000-11-10 | 2002-09-03 | Eaton Corporation | Circuit interrupter with thermal trip adjustability |
US6803850B2 (en) * | 2002-10-10 | 2004-10-12 | Square D Company | Thermal trip assembly and method for producing same |
DE102004054176A1 (de) * | 2004-11-10 | 2006-05-24 | Abb Patent Gmbh | Thermischer Auslöser |
DE102007005135A1 (de) * | 2007-02-01 | 2008-08-07 | Siemens Ag | Elektromechanisches Schaltgerät zum Schutz von elektrischen Leitungen bzw. Verbrauchern und Verwendung einer thermischen Ankopplung in einem elektromechanischen Schaltgerät |
DE102008017472A1 (de) * | 2007-04-28 | 2008-11-06 | Abb Ag | Installationsschaltgerät |
US7800478B2 (en) * | 2008-05-30 | 2010-09-21 | Eaton Corporation | Electrical switching apparatus and heater assembly therefor |
DE102012202153B4 (de) * | 2012-02-14 | 2021-09-16 | Siemens Aktiengesellschaft | Thermomagnetischer Auslöser für kleine Strombereiche sowie elektrisches Schaltgerät damit |
FR3045931B1 (fr) * | 2015-12-21 | 2017-12-22 | Schneider Electric Ind Sas | Dispositif d'assemblage d'un bilame et d'une piece formant support de ce bilame et appareil de protection electrique le comportant. |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2406325A (en) * | 1942-04-29 | 1946-08-27 | Westinghouse Electric Corp | Circuit interrupter |
DE2448026C3 (de) * | 1974-10-09 | 1978-09-28 | Ellenberger & Poensgen Gmbh, 8503 Altdorf | Direkt beheizter Bimetallstreifen zur thermischen Auslösung eines Überstromschalters |
JPS5696439A (en) * | 1979-12-28 | 1981-08-04 | Fuji Electric Co Ltd | Bimetal unit for circuit breaker |
FR2553928B1 (fr) * | 1983-10-21 | 1986-08-08 | Merlin Gerin | Bilame a chauffage mixte pour declencheur thermique d'un appareil de coupure |
GB2205998B (en) * | 1987-05-19 | 1991-03-13 | Crabtree Electrical Ind Ltd | Temperature responsive devices |
JPH01176621A (ja) * | 1987-12-29 | 1989-07-13 | Fuji Electric Co Ltd | 回路遮断器の過電流引外し装置 |
GB2228829B (en) * | 1989-02-22 | 1992-11-25 | Crabtree Electrical Ind Ltd | Improvements relating to circuit breakers |
-
1996
- 1996-09-23 FR FR9611649A patent/FR2753835B1/fr not_active Expired - Fee Related
-
1997
- 1997-07-31 EP EP97401850A patent/EP0831510B1/fr not_active Expired - Lifetime
- 1997-07-31 DE DE69707387T patent/DE69707387T2/de not_active Expired - Fee Related
- 1997-08-07 US US08/908,523 patent/US5844466A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2753835B1 (fr) | 1998-10-30 |
DE69707387D1 (de) | 2001-11-22 |
FR2753835A1 (fr) | 1998-03-27 |
US5844466A (en) | 1998-12-01 |
DE69707387T2 (de) | 2002-05-23 |
EP0831510A1 (fr) | 1998-03-25 |
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