EP2254138A2 - Déclencheur thermique et commutateur électrique doté d'un déclencheur thermique - Google Patents

Déclencheur thermique et commutateur électrique doté d'un déclencheur thermique Download PDF

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Publication number
EP2254138A2
EP2254138A2 EP10161048A EP10161048A EP2254138A2 EP 2254138 A2 EP2254138 A2 EP 2254138A2 EP 10161048 A EP10161048 A EP 10161048A EP 10161048 A EP10161048 A EP 10161048A EP 2254138 A2 EP2254138 A2 EP 2254138A2
Authority
EP
European Patent Office
Prior art keywords
switching device
extension
leg
strip
terminal
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.)
Withdrawn
Application number
EP10161048A
Other languages
German (de)
English (en)
Other versions
EP2254138A3 (fr
Inventor
Ralf Weber
Alexander Orban
Klaus Zimmer
Joachim Becker
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 AG Germany
Original Assignee
ABB AG Germany
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 AG Germany filed Critical ABB AG Germany
Publication of EP2254138A2 publication Critical patent/EP2254138A2/fr
Publication of EP2254138A3 publication Critical patent/EP2254138A3/fr
Withdrawn legal-status Critical Current

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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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H71/405—Combined electrothermal and electromagnetic mechanisms in which a bimetal forms the inductor for the electromagnetic mechanism
    • 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
    • H01H71/145—Electrothermal mechanisms using shape memory materials
    • 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

Definitions

  • the invention relates to a thermal release for an electrical installation switching device, in particular a circuit breaker, comprising a strip of bimetallic strip or of a shape memory alloy, wherein the strip is fastened with its attachment end to an extension of an arc guide rail and the extension forms a U-shape, according to the preamble of claim 1.
  • the invention further relates to an electrical switching device, in particular a circuit breaker, with a running between a first and a second terminal current path, with a movable contact piece, with an arc guide rail and with a thermal release, comprising a strip of bimetallic strip or of a shape memory alloy, wherein the Strip is fastened with its attachment end to an extension of the arc guide rail and the extension forms a U-shape, according to the preamble of claim 4.
  • an electrical switching device in particular a circuit breaker, with a running between a first and a second terminal current path, with a movable contact piece, with an arc guide rail and with a thermal release, comprising a strip of bimetallic strip or of a shape memory alloy, wherein the Strip is fastened with its attachment end to an extension of the arc guide rail and the extension forms a U-shape, according to the preamble of claim 4.
  • a generic circuit breaker is for example in the DE 10 2008 006 863 A1 shown. It has an access and an output terminal with a current path passed through it by the switching device.
  • the current path leads via a contact point which is formed between a moveable contact lever mounted on a movable and a fixed contact piece, as well as at least one thermal, often additionally via an electromagnetic release, of which the thermal release in the event of an overcurrent and the electromagnetic release contribute to the elimination of the switching device when a short-circuit current occurs.
  • the thermal trigger acts on triggering to a Verklinkungsstelle within a switching mechanism, which is coupled to the movable contact lever, to their unlatching a.
  • the contact lever is pivoted so that the movable and the fixed contact piece are separated.
  • the electromagnetic release opens when a short-circuit current occurs, the contact lever directly by impact; At the same time, the electromagnetic release also actuates the switch lock so that the switching device is permanently open.
  • the DE 44 45 170 A1 shows a thermal release for an electrical installation switching device, with a cantilevered bimetallic strip, wherein the clamping point is located at the end of an arc guide, which leads the emerging when opening the contact point switching arc in an arc extinguishing chamber.
  • the current is supplied to the bimetallic strip via a first stranded wire welded to the bimetallic strip, and at least one further stranded wire is welded to the bimetallic strip to remove the current again.
  • the installation of a generic thermal release in a service switching device is expensive.
  • the present invention is therefore in the light of the prior art, the object of further developing a generic thermal release so that its installation in a generic service switching device is simplified. Furthermore, the present invention has the object to provide a service switching device with a thermal release, simplifies its assembly and the arc guide is improved.
  • the extension has a first leg adjoining the guide rail, a bending point and a second leg adjoining the bending point, wherein the extension is slotted at the bending point and the second leg, so that the second leg is divided into a holding arm and a contact arm, wherein the strip is attached to the free end of the support arm, and wherein the contact arm is connected to a terminal rail of a terminal.
  • the advantage of the embodiment according to the invention is that a strand for Contacting of the bimetallic strip is omitted, because this is mechanically and electrically connected to the free end of the support arm, and the electrical contact with the terminal rail of the terminal via the contact arm of the extension. This opens up the possibility of easier mounting of the thermal release according to the invention.
  • the holding arm carries a projecting flag, which serves as a pivoting surface for an adjusting.
  • the adjustment means can act on the support arm without interfering with the bimetallic strip.
  • the bimetallic strip is attached to the free end of the support arm, the adjustment acts on the tab on the support arm, but just past the bimetallic strip.
  • the thermal release with the guide rail, the terminal and the strip is designed as a prefabricated module and in a service switching device, in particular a circuit breaker used.
  • a service switching device in particular a circuit breaker used.
  • An installation switching device is characterized in that the extension has a first leg adjoining the guide rail, a bending point and a second leg adjoining the bending point, wherein the extension is slotted at the bending point and the second leg, so that the second leg into a Holding arm and a contact arm is divided, wherein the strip is attached to the free end of the support arm, and wherein the contact arm is connected to a terminal rail of a terminal.
  • the holding arm carries a projecting flag, which serves as a pivoting surface for an adjusting.
  • the adjusting means is an adjusting screw, which is mounted in a housing-fixed thread. The installation of the service switching device is simplified.
  • the bending point according to the invention is the U-bend of the U-shaped extension.
  • the current flow of the current path through the inventive Installation switching device runs from the access terminal via the terminal rail, the contact arm, the bending point, the support arm through the bimetallic strip.
  • the U-shaped bend represents a current-carrying loop.
  • In the inventive position of the bending point next to the movable contact piece of the U-bend of the bending point acts as a large Blasschleife. After opening the contact point commutes the base of the switching arc of the movable contact piece on the first leg of the extension.
  • the current path then passes through the loop of the bending point and the arc.
  • the electromagnetic blowing action is amplified by the inventive U-shaped bend on the arc, which contributes to a faster shrinkage of the arc in the arc extinguishing chamber and thus to a faster erasing the arc.
  • the first leg of the extension is mounted fixed to the housing.
  • This can for example be done by the first leg of the extension is clamped between housing-fixed ribs on the inside of the housing shells.
  • the advantage is that with the housing-fixed mounting of the first leg and the attachment end of the bimetallic strip is fixed to the housing fixed. The bimetallic strip is clamped on one side at the attachment end. If the first leg of the extension and the clamping point according to the invention are fixed to the housing, a long-term stable adjustment of the thermal release is given.
  • the adjusting screw namely the opening of the U-shape of the extension is changed and thereby the distance between the Verklinkungsstelle and the free end of the bimetallic strip. Once set, this distance should not change under nominal conditions, therefore, the opening of the U-shape of the extension should not change.
  • the housing-fixed storage of the first leg of the extension allows this.
  • the thermal release with the guide rail, the terminal and the strip is designed as a prefabricated module and inserted into the service switching device.
  • An installation switching device is so easy to install.
  • FIG. 2 schematically shows an insight into an open housing of an electrical installation device 1, here a circuit breaker.
  • an electrical installation device 1 here a circuit breaker.
  • a current path initially passes over a terminal rail 29, a first conductor piece 14 welded thereto, to the bearing end 5 of a retaining leg 4, which is in the form of a U-bend.
  • a strip 2 welded from bimetallic strip with its attachment end 3.
  • the opposite, free end 7 of the bimetallic strip 2 is connected to a strand 20.
  • the contact lever 17 is shown in solid line in its off position, with a dashed line in its closed position. In the off position, when the contact point is opened, the movable contact piece 18 is adjacent to the U-shaped bearing end. 5
  • thermobimetallic strip 2 If the current in the main current path remains above the rated current for a long time, then one speaks of an overcurrent, bends the thermobimetallic strip 2 with its free, the fastening end opposite end due to the current heat caused in him by the overcurrent so far that he has an action line 22 acts on a switch lock 8 and there ensures that a Verklinkungsstelle is unlatched.
  • the realization of the interaction of the bimetallic strip with the switching mechanism 8 can be realized in various ways, one possibility is in the already mentioned DE 10 2008 006 863 A1 shown.
  • the rear derailleur acts on a line of action 24 on the contact lever 17 and pivots it in a clockwise direction, so that the movable contact piece 18 separated from the fixed contact piece 19 and the contact point is opened and held open by the switch lock 8, see the pulled out drawn position of the contact lever 17th
  • a reconnection can be done via a switch knob 27 which cooperates via a line of action 26 with the switch lock 8 and when actuated a latching of Verklinkungsstelle allowed when the bimetallic strip 2 has bent back to its original position after the overcurrent has subsided.
  • the adjustment of the bimetallic strip 2 via an adjusting screw 13. This is in a fixed housing screw thread, not shown, stored.
  • the screw thread can for example be molded with its threaded sleeve on the inside of the housing shell. Thus, it changes the opening of the U-shape between the support leg 4 and the first leg 32. Since the Thermobimetallstsammlung 2 is welded to the bottom of the support leg 4, by pivoting the retaining leg 4 of the distance the free operating end 7 of the bimetallic strip 2 of the switching mechanism 8 adjustable.
  • the electromagnetic blowing action is amplified by the inventive U-shaped bend on the arc, which contributes to a faster shrinkage of the arc in the arc extinguishing chamber and thus to a faster erasing the arc.
  • the arc guide rail 12 carries on its left, the contact point facing side, the aforementioned extension 31. This has approximately a U-shape, with a first leg 32 which is connected directly to the arc guide rail 12, and a second leg 4, the Holding leg 4 forms and is therefore also referred to as holding leg 4.
  • the holding leg 4 is formed by bending the extension 31 at the already mentioned bearing end 5, also called bending point.
  • the arc guide rail 12 with the extension 31 may be made of one part.
  • this is a stamped and bent part made of steel. Steel is preferred because of its magnetic properties, strength and low cost.
  • the guide rail 12 and the first leg 32 are fixed to the housing and held, which can be made possible in various ways, for example by clamping between webs on the inside of the housing.
  • the retaining leg 4 must remain movable, as has been explained above in connection with the adjustment of the bimetallic strip.
  • the tight fit of the first leg 32 is important in terms of the consistency of the thermal tripping characteristics, since thereby the position of the bimetallic strip 2 relative to the switch lock 8 also remains fixed, after being adjusted once.
  • FIG. 1 shows in an isolated detail view of the extension 31 and its connection to the access terminal 9. It recognizes the one-piece design of arc guide rail 12, first leg 32 and second leg 4 as a stamped and bent part made of steel. At the upper bending point, which forms the bearing end 5, the steel strip is slotted. This results in two parallel partial strips 41, 42. One of these partial strips is bent as a holding arm 41 downward. The adjacent sub-strip 42 is also referred to as a contact arm 42 and is again bent downwards after a short course, pointing horizontally in the direction of the access terminal 9 back. It thus forms the first conductor piece 14, which is at a junction 33 with the busbar of the access terminal 9, the terminal rail 29, welded.
  • the access terminal 9 may be, for example, a known double-stroke cylinder clamp.
  • the terminal rail 29 is a bus bar, against which an inserted connection conductor is pressed with tightened or screwed clamp and thereby an electrical and mechanical Connection between the connection conductor and the terminal rail is made.
  • the assembly comprising the arc guide rail 12, the extension 31, the bimetallic strip 2 (not shown in FIG Fig. 1 ) and the access terminal 9 welded thereto via the terminal rail 29 can be manufactured as a prefabricated unit and used in a simple manner during installation in the service switching device.
  • the free end 6 of the holding arm 41 is stepped in the form of an L, so that the attachment surface 61, to which the attachment end 3 of the bimetallic strip is welded, has a distance from the holding arm 41.
  • the bimetallic strip 2 can therefore bend freely from the holding arm 41 about its clamping point.
  • Above the clamping a laterally projecting flag 43 is attached to the support arm.
  • the adjusting screw 13 does not press directly on the support arm 41, but on the surface of the flag 43.
  • the adjusting screw 13 thus extends in a plane next to the bimetallic strip 2 without affecting it. In this way, a very space-saving arrangement of the assembly of the thermal release 34 in the housing of the service switching device 1 is possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
EP10161048A 2009-05-18 2010-04-26 Déclencheur thermique et commutateur électrique doté d'un déclencheur thermique Withdrawn EP2254138A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910021773 DE102009021773B4 (de) 2009-05-18 2009-05-18 Thermischer Auslöser und elektrisches Schaltgerät mit einem thermischen Auslöser

Publications (2)

Publication Number Publication Date
EP2254138A2 true EP2254138A2 (fr) 2010-11-24
EP2254138A3 EP2254138A3 (fr) 2013-03-06

Family

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EP10161048A Withdrawn EP2254138A3 (fr) 2009-05-18 2010-04-26 Déclencheur thermique et commutateur électrique doté d'un déclencheur thermique

Country Status (3)

Country Link
EP (1) EP2254138A3 (fr)
CN (2) CN201601035U (fr)
DE (1) DE102009021773B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112768292A (zh) * 2019-10-21 2021-05-07 马赛尔·P·霍夫萨埃斯 温控开关

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009021773B4 (de) * 2009-05-18 2014-12-04 Abb Ag Thermischer Auslöser und elektrisches Schaltgerät mit einem thermischen Auslöser
EP2824689B1 (fr) 2013-06-13 2016-04-06 ABB Schweiz AG Déclencheur dynamique et commutateur d'installation électrique doté d'un déclencheur dynamique
CN107533934B (zh) * 2015-04-14 2019-12-27 赛峰电气与电源公司 包括形状记忆合金元件的电控开关装置
DE102015213375B4 (de) 2015-07-16 2023-06-07 Siemens Ag Thermische Überlast-Auslösevorrichtung und Schutzschaltgerät
CN114792613B (zh) * 2022-03-30 2023-07-25 中群电气有限公司 一种过载快速恢复断路器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445170A1 (de) 1994-12-17 1996-06-27 Abb Patent Gmbh Thermischer Auslöser
DE102008006863A1 (de) 2007-05-23 2009-01-22 Abb Ag Elektrisches Installationsschaltgerät

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185590A (en) * 1991-12-23 1993-02-09 North American Philips Corporation Magnetic blow-out circuit breaker with booster loop/arc runner
FR2722331B1 (fr) * 1994-07-08 1996-09-27 Legrand Sa Sous-ensemble thermique pour disjoncteur
US5872495A (en) * 1997-12-10 1999-02-16 Siemens Energy & Automation, Inc. Variable thermal and magnetic structure for a circuitbreaker trip unit
DE102009021773B4 (de) * 2009-05-18 2014-12-04 Abb Ag Thermischer Auslöser und elektrisches Schaltgerät mit einem thermischen Auslöser
DE102009023557B3 (de) * 2009-05-30 2010-08-05 Abb Ag Elektrisches Schaltgerät mit einem thermischen Auslöser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445170A1 (de) 1994-12-17 1996-06-27 Abb Patent Gmbh Thermischer Auslöser
DE102008006863A1 (de) 2007-05-23 2009-01-22 Abb Ag Elektrisches Installationsschaltgerät

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112768292A (zh) * 2019-10-21 2021-05-07 马赛尔·P·霍夫萨埃斯 温控开关
US11749479B2 (en) 2019-10-21 2023-09-05 Marcel P. HOFSAESS Temperature-dependent switch
US11881369B2 (en) 2019-10-21 2024-01-23 Marcel P. HOFSAESS Temperature-dependent switch

Also Published As

Publication number Publication date
DE102009021773B4 (de) 2014-12-04
CN101976639A (zh) 2011-02-16
EP2254138A3 (fr) 2013-03-06
DE102009021773A1 (de) 2010-11-25
CN201601035U (zh) 2010-10-06
CN101976639B (zh) 2014-06-18

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