EP0213979B1 - Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist - Google Patents

Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist Download PDF

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Publication number
EP0213979B1
EP0213979B1 EP86401474A EP86401474A EP0213979B1 EP 0213979 B1 EP0213979 B1 EP 0213979B1 EP 86401474 A EP86401474 A EP 86401474A EP 86401474 A EP86401474 A EP 86401474A EP 0213979 B1 EP0213979 B1 EP 0213979B1
Authority
EP
European Patent Office
Prior art keywords
tail
bimetallic strip
coil
trip release
foot
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
Application number
EP86401474A
Other languages
English (en)
French (fr)
Other versions
EP0213979A1 (de
Inventor
William Bartolo
Louis Boillot
René Challande
Patrick De Robertis
Jacky Duchenaud
Jean-Claude Ramaciotti
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Priority to AT86401474T priority Critical patent/ATE57445T1/de
Publication of EP0213979A1 publication Critical patent/EP0213979A1/de
Application granted granted Critical
Publication of EP0213979B1 publication Critical patent/EP0213979B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2481—Electromagnetic mechanisms characterised by the coil design

Definitions

  • circuit breakers are already known, such as for example documents FR-A 2 262 396 and DE-A 1 463 684.
  • one of the ends of the coil is connected to the head of the bimetallic strip by a connecting braid.
  • the foot of the bimetallic strip is generally carried by a metal support connected to an electrode for guiding the arc and to the contact pad of the pole.
  • the braid connects the thermal trip unit and the electromagnetic trip unit in series.
  • the metal support cooperates by deformation with a screw for adjusting the thermal trigger threshold, so as to cause a variation in the transverse spacing of the head of the bimetal strip with the trigger bar of the mechanism.
  • the bimetallic strip is directly heated, since the current flows over its entire length. The industrial production of such a thermomagnetic trip device is complicated.
  • the object of the invention is to improve the setting of a thermomagnetic trip device for a circuit breaker, and to reduce its manufacturing cost.
  • the trip device is characterized in that the coil of said electromagnet is extended by a tail, arranged as an adjustable support member for the bimetallic strip, the foot of the latter being inserted by welding between said tail and an electrical connection means with a contact pad, to cause the current to flow in the thickness direction of the bimetallic foot and that the tail has a hinge between the junction point of the bimetallic foot and the coil, so as to allow relative movement , of a part of said tail under the action of the device for adjusting the thermal trip threshold, the other part, connected to the coil remaining substantially stationary.
  • tail of the electromagnet coil as a bimetal support allows the removal of the connecting braid between the coil and the head of the bimetallic strip, and the removal of any special element for supporting the foot of the bimetallic strip.
  • the heating of the coil due to the passage of current from the pole can reach 90 degrees.
  • the hinge is formed by a reduced section area allowing mechanical deformation of said shank, during the screwing or unscrewing of a screw of said adjusting device.
  • the presence of the hinge makes it possible to deform the tail of the coil for adjusting the thermal trigger threshold, without any transmission of forces to the frame of the electromagnet.
  • the electromagnetic trigger threshold of the second trigger remains invariable, when the first trigger is adjusted.
  • the end of the tail is housed in a positioning cage, cooperating with the screw of the device for adjusting the thermal trigger threshold.
  • the tail and adjustment device assembly is carried by a metal bracket or fixed flange, positioned in a cell of the insulating housing.
  • the stirrup is equipped with an extension serving as a support for said part of the tail, arranged between the hinge and the coil.
  • the screw plays through two guide holes in the U-shaped stirrup, in a direction perpendicular to the end of the tail.
  • the increase or decrease in the thermal tripping threshold is effected by screwing or unscrewing the adjusting screw.
  • the hinge axis of articulation comprises a needle or pivot cooperating with the reduced section area of the tail.
  • the means of electrical connection between the foot of the bimetallic strip and the corresponding contact pad comprises a conductive lever, extending near the bimetallic strip, so as to constitute a combined indirect heating member, by radiation from the bimetallic strip, and transmission of the thermal threshold adjustment torque by the screw.
  • FIG. 1 shows a magneto-thermal trip device 10 incorporated in a pole of a miniature circuit breaker with insulating casing 11, between the arc quenching chamber 12 and the control mechanism (not shown).
  • the thermomagnetic trip device 10 comprises a first bimetal thermal trip device 14, sensitive to overload currents and a second electromagnetic trip device with electromagnet 16 for protection against short-circuits cooked.
  • the arc extinguishing chamber 12 is constituted by a stack of parallel plates 18 for deionizing the arc, and the control mechanism is of the type described in French patent FR-A 2 344 949 to which reference will be made. advantageously for further details.
  • the fixed contact 26 is carried by a conductive bar acting as a lower arc horn 30, and the movable contact 28 is arranged at the end of a tilting contact arm 32, actuated by the mechanism.
  • the electromagnet 16 of the electromagnetic trip device comprises a coil 34 surrounded by a metal carcass 36, and a magnetic plunger core mounted to slide axially in the cylindrical coil 34 whose axis is parallel to the sheets 18.
  • the plunger core carries at one of its ends an extractor 38 acting on the contact arm 32, and on the opposite actuates a pusher 40 for unlocking the trigger bar 20.
  • One of the connection ends of the coil 34 located on the side of the extractor 38, is electrically connected to an electrode 42 forming the upper arc horn which frames the chamber 12 with the opposite bar of the lower arc horn 30.
  • the operation of such a trigger magnetothermal is well known to specialists.
  • the coil 34 of the electromagnetic trip device comprises a few contiguous turns formed after helical winding of a deformable conductor, in particular made of copper coated with an insulating coating.
  • the terminal turn 43 located on the side of the trigger bar 20, opposite the extractor 38 is extended by a tail 44 serving as a support member for the bimetallic strip 14, in the form of an elongated blade.
  • the conductor constituting the turns and the tail 44 has a uniform section arranged to give a certain rigidity to the coil 34.
  • the tail 44 of the coil 34 is substantially rectilinear, and extends in an oblique direction towards the exhaust orifice 46 located at the outlet of the arc extinguishing chamber 12.
  • the foot 48 of the bimetallic strip 14 is fixed by welding at an intermediate point 49 of a stripped portion of the tail 44, so as to allow a good heat transfer from the coil 34 to the bimetallic strip 14.
  • the direct welding of the bimetallic strip 14 onto the tail 44 makes it possible to dispense with a flexible braid for electrical connection between the coil and the bimetallic strip, as well as a special metallic device for supporting the bimetallic strip.
  • the end 50 of the tail 44 cooperates with an adjustment device 52 of the thermal tripping threshold of the bimetal strip 14.
  • the adjustment device 52 shown in detail in FIGS. 2 and 3, comprises a screw 54 inserted in an inclined orifice 56 of the insulating housing 11, and screwed into a threaded hole 57 of a U-shaped positioning cage 58.
  • the end 50 of the tail 44 is housed in the cage 58 such that the screwing or unscrewing of the adjusting screw 54 causes a slight deformation of the tail 44, resulting in a relative displacement of the free end of the bimetallic strip 14 in approach to or at a spacing from the trigger bar 20.
  • the tail 44 of the coil 34 is advantageously provided with a notch of reduced section forming hinge 60, arranged between the point 49 of junction of the bimetallic strip 14 and the terminal turn 43.
  • the assembly tail 44 and adjusting device 52 is carried by a stirrup 62 or fixed flange positioned in a cell 64 of the housing 1 1.
  • the upper 66 and lower 67 parallel branches of the stirrup 62 have slots 68, aligned in guide, for the clearance of the screw 54 to play.
  • the screw head 54 is supported on the external face of the upper branch 66 , while the lower branch 67 is extended by an extension 70, secured by welding to the tail 44 in the vicinity of the hinge 60.
  • the latter is advantageously located between the point 72 of mechanical junction of the extension 70 with the tail 44, and the end positioning cage 58.
  • the screw 54 extends perpendicular to the end 50 of the tail 44.
  • the positioning cage 58 moves in alternating translation inside the fixed stirrup 62, and causes a slight pivoting of the end 50 of the tail 44 around the hinge 60.
  • the other rigid part of the tail 44 located between the hinge 60 and the terminal turn 43 remains stationary during adjustment, thanks to the effective maintenance of the extension 70 of the stirrup 62 for fixing.
  • the stirrup 62 and the cage 58 for positioning the end 50 are made of a non-deformable metallic material of high mechanical strength, in particular steel, and having an electrical resistivity greater than that of the conductor of the tail 44.
  • a braid 76 of connection is welded to the foot 48 of the bimetallic strip 14, and is connected to a connection pad (not shown). The current flowing in the coil 34 from the range passes through the foot 48 of the bimetallic strip 14 in the thickness direction. The deflection of the bimetallic strip 14 results essentially from the heat conduction by the tail 44 of the coil 34.
  • the same reference numbers designate parts that are identical or similar to those of FIG. 1.
  • the end 50 of the tail 44 is welded directly to one of the sides of the foot 48 of the bimetallic strip 14, while a lever 80 for adjusting the thermal threshold is fixed by welding to the opposite side of the foot 48.
  • a connecting braid 82 connects the metallic lever 80 to a contact pad 84 associated with a terminal for connecting the pole.
  • the pole current flows in the tail 44 of the coil 34 and in the lever 80 after crossing the foot 48 of the bimetallic strip 14 in its thickness.
  • the rest of the bimetallic strip 14 is not traversed by the current.
  • the triple weld at the foot 48 makes it possible to guarantee excellent consistency between the intensity of the pole current and the thermal trigger threshold.
  • the deflection of the bimetallic strip 14 results from both the heat conduction, following the heating of the coil 34, the partial direct heating by passage of the current through the foot 48, and the indirect heating by thermal radiation from the lever 80.
  • the adjustment lever 80 conducts the current between the foot 48 of the bimetallic strip 14 and the braid 82 in connection with the pad 84.
  • the lever 80 serves as a heater for the bimetallic strip 14, and the material of the lever 80 is chosen to adjust the indirect heating by radiation.
  • the transmission of the adjusting torque by the lever 80 is effected by the screw 54 which causes a slight pivoting of the foot 48 of the bimetallic strip 14 around the axis of rotation of the hinge 60.
  • the axis is real, and comprises a needle 86 or pivot to the right of the narrowed section 88 of the tail 44. Stops 90 formed by ribs of the insulating housing 11 ensure the stable maintenance of the tail 44, and prevent any transmission of mechanical forces to the carcass 36 of the coil 34.
  • the axis of rotation of the hinge is fictitious, and is constituted by the projecting edge of a stop 92 bearing on the end 50 of the tail 44. Between the two stops 90, 92, is finds the deformable zone with a narrowed section 88, intended to absorb any lateral displacement towards the coil 34.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Electric Clocks (AREA)

Claims (9)

1. Magnetothermischer Auslöser (10), der dem Öffnungsmechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist, mit:
- einem ersten thermischen Auslöser mit einem für Oberlastströme empfindlichen Bimetallstreifen (14),
- einem zweiten elektromagnetischen Auslöser zum Schutz gegen Kurzschluß-Ströme, der einen Elektromagnet (16) mit einer Steuerspule (34) aufweist, die von der Spiralwindung eines deformierbaren Leiters gebildet wird, mit einer vorbestimmten Starrheit,
- und einer Einstellvorrichtung (52) der thermischen Auslöseschwelle des ersten Auslösers,
dadurch gekennzeichnet, daß die Spule (34) des genannten Elektromagneten durch ein Endstück (44) verlängert wird, das als einstellbares Tragelement des Bimetallstreifens (14) ausgebildet ist, wobei der Fuß (48) des Bimetallstreifens durch Schweissen zwischen dem genannten Endstück (44) und einem elektrischen Verbindungsmittel (76, 80) mit einem Kontaktbereich eingefügt ist, um das Durchfließen des Stromes in der Richtung der Dicke des Fußes (48) des Bimetallstreifens (14) zu bewirken, und daß das Endstück (44) ein Scharnier (60) zwischen dem Verbindungspunkt des Fußes (48) des Bimetallstreifens (14) und der Spule (34) aufweist, um eine relative Bewegung eines Teils des genannten Endstückes (44) zu erlauben unter Wirkung der Einstellvorrichtung (52) der thermischen Auslöseschwelle, während das andere, mit der Spule (34) verbundene Teil unbeweglich bleibt.
2. Magnetothermischer Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß das Scharnier (60) durch einen Bereich von verringertem Querschnitt gebildet wird, was eine mechanische Deformierung des genannten Endstückes (44) ermöglicht beim Festdrehen oder Losdrehen einer Schraube (54) der genannten Einstellvorrichtung (52).
3. Magnetothermischer Auslöser nach Anspruch 2, dadurch gekennzeichnet, daß das Ende (50) des Endstückes (44) in einem Einstellkäfig (58) angeordnet ist, welcher mit der Schraube (54) der Einstellvorrichtung (52) der thermischen Auslöseschwelle zusammenarbeitet.
4. Magnetothermischer Auslöser nach Anspruch 3, dadurch gekennzeichnet, daß das Ganze, Endstück (44) und Einstellvorrichtung (52), von einem feststehenden metallischen Bügel oder Flansch (62) getragen wird, der in einer Zelle (64) des Isoliergehäuses (11) untergebracht ist, und daß der Bügel (62) mit einer Verlängerung (70) versehen ist, die als Träger für das genannte zwischen dem Scharnier (60) und der Spule (34) angeordnete Teil des Endstückes (44) dient.
5. Magnetothermischer Auslöser nach Anspruch 4, dadurch gekennzeichnet, daß die Schraube (54) mit Spiel zwei Führungsöffnungen (68) des Bügels (62) in U-Form durchquert, gemäß einer zum Ende (50) des Endstückes (44) senkrechten Richtung.
6. Magnetothermischer Auslöser nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Gelenkachse des Scharniers (60) eine Nadel oder einen Bolzen (86) aufweist, der mit dem Bereich von verringertem Querschnitt des Endstückes (44) zusammenarbeitet.
7. Magnetothermischer Auslöser nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß das elektrische Verbindungsmittel zwischen dem Fuß (48) des Bimetallstreifens (14) und dem entsprechenden Kontaktbereich (84) eine Leittresse (76) aufweist, und daß der Bügel (62) und der Einstellkäfig (58) aus einem nicht deformierbaren metallischen Material bestehen, mit einem spezifischen elektrischen Leitungswiderstand, der größer ist als der des Leiters des Endstückes (44).
8. Magnetothermischer Auslöser nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das elektrische Verbindungsmittel zwischen dem Fuß (48) des Bimetallstreifens (14) und dem entsprechenden Kontaktbereich (84) einen Leithebel (80) aufweist, der sich in der Nähe des Bimetallstreifens (14) erstreckt, um ein kombiniertes indirektes Heizelement durch Strahlung des Bimetallstreifens (14) und ein Übertragungselement des Einstellmoments der thermischen Schwelle durch die Schraube (54) zu bilden.
EP86401474A 1985-07-31 1986-07-03 Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist Expired - Lifetime EP0213979B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401474T ATE57445T1 (de) 1985-07-31 1986-07-03 Magnetothermischer ausloeser der dem mechanismus eines miniaturschalters mit isoliergehaeuse zugeordnet ist.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511839A FR2585877B1 (fr) 1985-07-31 1985-07-31 Declencheur magnetothermique associe au mecanisme d'un disjoncteur miniature a boitier isolant
FR8511839 1986-01-03

Publications (2)

Publication Number Publication Date
EP0213979A1 EP0213979A1 (de) 1987-03-11
EP0213979B1 true EP0213979B1 (de) 1990-10-10

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Application Number Title Priority Date Filing Date
EP86401474A Expired - Lifetime EP0213979B1 (de) 1985-07-31 1986-07-03 Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist

Country Status (5)

Country Link
EP (1) EP0213979B1 (de)
AT (1) ATE57445T1 (de)
DE (1) DE3674867D1 (de)
FR (1) FR2585877B1 (de)
ZA (1) ZA865159B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309197A1 (de) * 1993-03-22 1994-09-29 Maier & Cie C Leitungsschutzschalter
DE19952186A1 (de) * 1999-10-29 2001-05-03 Moeller Gmbh Elektrisches Schutzschaltgerät
CZ300253B6 (cs) * 2005-08-15 2009-04-01 Oez S. R. O. Serizovací ústrojí, zvlášte pro tepelnou spoušt elektrického spínacího prístroje
CN100377270C (zh) * 2005-12-07 2008-03-26 上海电器科学研究所（集团）有限公司 热磁式脱扣器及其电流调节旋钮

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597445C (de) * 1928-07-25 1934-05-25 Schiele & Bruchsaler Industrie UEberstromausloeser fuer elektrische Schalter
DE1463684B2 (de) * 1964-11-17 1970-06-18 Stotz-Kontakt GmbH, 6800 Mannheim-Käfertal Installationsselbstschalter mit thermischem und magnetischem.Auslöser
GB1459298A (en) * 1974-02-27 1976-12-22 Ottermill Ltd Electric circuit breakers
FR2344949A1 (fr) * 1976-03-15 1977-10-14 Merlin Gerin Disjoncteur miniature basse tension
FR2429487A1 (fr) * 1978-06-23 1980-01-18 Merlin Gerin Disjoncteur a bloc declencheur amovible

Also Published As

Publication number Publication date
EP0213979A1 (de) 1987-03-11
DE3674867D1 (de) 1990-11-15
ZA865159B (en) 1987-02-25
FR2585877B1 (fr) 1987-10-23
FR2585877A1 (fr) 1987-02-06
ATE57445T1 (de) 1990-10-15

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