EP0213979A1 - Magnetothermal release mechanism associated with the mechanism of a miniature circuit breaker with an insulating casing - Google Patents

Magnetothermal release mechanism associated with the mechanism of a miniature circuit breaker with an insulating casing Download PDF

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Publication number
EP0213979A1
EP0213979A1 EP86401474A EP86401474A EP0213979A1 EP 0213979 A1 EP0213979 A1 EP 0213979A1 EP 86401474 A EP86401474 A EP 86401474A EP 86401474 A EP86401474 A EP 86401474A EP 0213979 A1 EP0213979 A1 EP 0213979A1
Authority
EP
European Patent Office
Prior art keywords
tail
bimetallic strip
coil
foot
trip device
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
Application number
EP86401474A
Other languages
German (de)
French (fr)
Other versions
EP0213979B1 (en
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/en
Publication of EP0213979A1 publication Critical patent/EP0213979A1/en
Application granted granted Critical
Publication of EP0213979B1 publication Critical patent/EP0213979B1/en
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

  • thermomagnetic trip device associated with a mechanism for opening a miniature circuit breaker with molded insulating housing, comprising: - a first bimetal thermal trip device sensitive to overload currents, a second electromagnetic trip device for protection against short-circuit currents, comprising an electromagnet with a control coil, constituted by helical winding of a deformable conductor having a predetermined stiffness, - And a device for adjusting the thermal trigger threshold of the first trigger.
  • 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 bimetallic 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 trigger according to the invention 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 a connecting means electric 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 a relative displacement 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 supporting the foot of the bimetallic strip. In normal operation of the circuit breaker, 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 magnetothermal 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.
  • 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 No. 2,344,949 to which reference will advantageously be made for more 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 part of the tail 44, so as to allow a good heat transfer from the coil 34 to the bimetallic strip 14.
  • Direct welding of the bimetallic strip 14 on 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 bimetallic 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 58-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, causing a relative displacement of the free end of the bimetallic strip 14 in approach or at a distance from the trigger bar 20.
  • the tail 44 of the coil 34 is advantageously provided with a reduced section notch forming a hinge 60, arranged between the point 49 of junction of the bimetallic strip 14 and the end turn 43.
  • the tail 44 and adjustment device 52 assembly is carried by a stirrup 62 or fixed flange positioned in a cell 64 of the housing 11.
  • the upper 66 and lower 67 parallel branches of the stirrup 62 include slots 68, aligned in guide, for the passage of clearance of the screw 54.
  • the screw head 54 bears 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 cage 58 for positioning the end 50.
  • the screw 54 extends perpendicularly at 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 connecting braid 76 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 adjustment torque by the lever 80 is effected by the screw 54 which causes the foot 48 of the bimetallic strip 14 to pivot slightly around the axis of rotation of the hinge 60. According to FIGS. 4 and 5, the axis is real, and has 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 ensures the stable maintenance of the tail 44, and prevents 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.

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

Abstract

1. Thermomagnetic trip release (10), associated with an opening mechanism of a molded insulated case miniature circuit breaker, comprising : - a first thermal trip release with a bimetallic strip (14) sensitive to overload currents, - a second electromagnetic trip release for protection against short-circuit currents, comprising a control coil (34) electromagnet (16), made up by helical winding of a deformable conductor having a preset rigidity, - and an adjustment device (52) of the thermal tripping threshold of the first trip release, characterized in that the coil (34) of said electromagnet is extended by a tail (44), arranged as an adjustable support part of the bimetallic strip (14), the foot (48) of the latter being inserted by soldering between said tail (44) and an electrical connection means (76, 80) with a contact pad, to cause the current to flow thickness-wise through the foot (48) of the bimetallic strip (14), and that the tail (44) comprises a hinge (60) between the junction point of the foot (48) of the bimetallic strip (14) and the coil (34), in such a way as to allow a relative movement of one part of said tail (44) due to the action of the thermal tripping threshold adjusting device (52), the other part, connected to the coil (34) remaining appreciably stationary.

Description

L'invention est relative à un déclencheur magnétothermique, associé à un mécanisme d'ouverture d'un disjoncteur miniature à boîtier isolant moulé, comprenant :
- un premier déclencheur thermique à bilame sensible à des courants de surcharge,
- un deuxième déclencheur électromagnétique pour la protection contre les courants de courts-circuits, comportant un électro-­aimant à bobine de commande, constituée par enroulement héli­coïdal d'un conducteur déformable ayant une rigidité prédéter­minée,
- et un dispositif de réglage du seuil de déclenchement thermique du premier déclencheur.The invention relates to a thermomagnetic trip device, associated with a mechanism for opening a miniature circuit breaker with molded insulating housing, comprising:
- a first bimetal thermal trip device sensitive to overload currents,
a second electromagnetic trip device for protection against short-circuit currents, comprising an electromagnet with a control coil, constituted by helical winding of a deformable conductor having a predetermined stiffness,
- And a device for adjusting the thermal trigger threshold of the first trigger.

Lorsque la bilame et l'électro-aimant sont situés d'un même côté, par rapport à la position du contact mobile, l'une des extrémités de la bobine est raccordée à la tête de la bilame par une tresse de liaison. A l'opposé de la tête, le pied de la bilame est généralement porté par un support métallique connecté à une électrode de guidage de l'arc et à la plage de contact du pôle. La tresse assure la mise en série du déclen­cheur thermique et du déclencheur électromagnétique. Le support métallique coopère par déformation avec une vis de réglage du seuil de déclenchement thermique, de manière à provoquer une variation de l'écartement transversal de la tête de la bilame avec la barre de déclenchement du mécanisme. La bilame est à chauffage direct, étant donné que la circulation du courant s'effectue sur toute sa longueur. La réalisation industrielle d'un tel déclencheur magnétothermique est compliquée.When the bimetallic strip and the electromagnet are located on the same side, relative to the position of the movable contact, one of the ends of the coil is connected to the head of the bimetallic strip by a connecting braid. Opposite the head, 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 bimetallic 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.

L'objet de l'invention consiste à améliorer le réglage d'un déclencheur magnétothermique pour disjoncteur, et à diminuer son coût de fabrication.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.

Le déclencheur selon l'invention est caractérisé en ce que la bobine dudit électro-aimant est prolongée par une queue, agencée en organe de support réglable de la bilame, le pied de cette dernière étant insérée par soudage entre ladite queue et un moyen de liaison électrique avec une plage de contact, pour provoquer le passage du courant dans le sens de l'épais­seur du pied de la bilame et que la queue comporte une charnière entre le point de jonction du pied de la bilame et la bobine, de manière à autoriser un déplacement relatif, d'une partie de ladite queue sous l'action du dispositif de réglage du seuil de déclenchement thermique, l'autre partie, reliée à la bobine restant sensiblement immobile.The trigger according to the invention 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 a connecting means electric 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 a relative displacement 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.

L'utilisation de la queue de la bobine de l'électro-aimant comme support de bilame permet la suppression de la tresse de liaison entre la bobine et la tête de la bilame, et la suppression de tout élément spécial de support du pied de la bilame.
En fonctionnement normal du disjoncteur, l'échauffement de la bobine dû au passage du courant du pôle peut atteindre 90 degrés.The use of the 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 supporting the foot of the bimetallic strip.
In normal operation of the circuit breaker, the heating of the coil due to the passage of current from the pole can reach 90 degrees.

Le soudage direct du pied de la bilame à la queue de la bobine assure un bon transfert de chaleur par conduction de la bobine vers la bilame.
Le passage du courant dans le sens de l'épaisseur du pied de la bilame permet de garantir une excellente cohérence entre l'intensité du courant du pôle et la valeur du seuil de déclen­chement thermique.Direct welding of the foot of the bimetallic strip to the tail of the coil ensures good heat transfer by conduction from the coil to the bimetallic strip.
The passage of the current in the thickness direction of the foot of the bimetallic strip guarantees excellent consistency between the intensity of the current of the pole and the value of the thermal trip threshold.

Selon une caractéristique de l'invention, la charnière est formée par une zone à section réduite autorisant une déformation méca­nique de ladite queue, au cours du vissage ou du dévissage d'une vis dudit dispositif de réglage.According to a characteristic of the invention, 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.

La présence de la charnière permet de déformer la queue de la bobine pour le réglage du seuil de déclenchement thermique, sans aucune transmission d'efforts vers la carcasse de l'élec­tro-aimant. Il en résulte que le seuil de déclenchement élec­tromagnétique du deuxième déclencheur reste invariable, lors du réglage du premier déclencheur.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. As a result, the electromagnetic trigger threshold of the second trigger remains invariable, when the first trigger is adjusted.

Selon un premier mode de réalisation de l'invention, l'extrémité de la queue est logée dans une cage de positionnement, coopérant avec la vis du dispositif de réglage du seuil de déclenchement thermique. L'ensemble queue et dispositif de réglage est porté par un étrier métallique ou flasque fixe, positionné dans une alvéole du boîtier isolant. L'étrier est équipé d'une extension servant de support à ladite partie de la queue, agencée entre la charnière et la bobine.According to a first embodiment of the invention, 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.

La vis traverse à jeu deux lumières de guidage de l'étrier en forme U, selon une direction perpendiculaire à l'extrémité de la queue.The screw plays through two guide holes in the U-shaped stirrup, in a direction perpendicular to the end of the tail.

L'augmentation ou la diminution du seuil de déclenchement ther­mique s'opère par vissage ou dévissage de la vis de réglage. L'axe d'articulation de la charnière comporte une aiguille ou pivot coopérant avec la zone à section réduite de la queue.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.

Selon un deuxième mode de réalisation, le moyen de liaison électrique entre le pied de la bilame et la plage de contact correspondante comporte un levier conducteur, s'étendant à proximité de la bilame, de manière à constituer un organe combiné de chauffage indirect, par rayonnement de la bilame, et de transmission du couple de réglage du seuil thermique par la vis.According to a second embodiment, 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.

D'autres avantages et caractéristiques ressortiront plus clai­rement de la description qui va suivre de plusieurs variantes de réalisation de l'invention, données à titre d'exemples non limitatifs et représentés aux dessins annexés, dans lesquels :

  • - la figure 1 est une vue partielle en élévation d'un disjonc­teur équipé du déclencheur magnétothermique selon l'invention ;
  • - la figure 2 montre une vue de détail à échelle agrandie, du déclencheur selon la figure 1 ;
  • - la figure 3 est une vue en coupe selon la ligne III-III de la figure 2 ;
  • - les figures 4 à 6 représentent des vues schématiques de trois variantes de réalisation.
Other advantages and characteristics will emerge more clearly from the description which follows of several alternative embodiments of the invention, given by way of nonlimiting examples and represented in the appended drawings, in which:
  • - Figure 1 is a partial elevational view of a circuit breaker equipped with the thermomagnetic trip device according to the invention;
  • - Figure 2 shows a detail view on an enlarged scale, of the trigger according to Figure 1;
  • - Figure 3 is a sectional view along line III-III of Figure 2;
  • - Figures 4 to 6 show schematic views of three alternative embodiments.

La figure 1 montre un déclêncheur magnétothermique 10 incor­poré dans un pôle d'un disjoncteur miniature à boîtier 11 isolant, entre la chambre 12 d'extinction d'arc et le mécanis­me de commande (non représenté). Le déclencheur magnétother­mique 10 comporte un premier déclencheur thermique à bilame 14, sensible aux courants de surcharge et un deuxième déclen­cheur électromagnétique à électro-aimant 16 pour la protection contre les courts-circuits. La chambre 12 d'extinction d'arc est constituée par un empilage de tôles 18 parallèles de désionisation de l'arc, et le mécanisme de commande est du type décrit dans le brevet français N° 2 344 949 auquel on se reportera avantageusement pour de plus amples détails. Une barre de déclenchement 20, montée à rotation limitée sur un axe 22, est pilotée par le déclencheur 10 lors de l'apparition d'un courant de défaut, de manière à libérer le crochet 24 du mécanisme pour l'ouverture des contacts 26, 28. Le contact fixe 26 est porté par une barrette conductrice jouant le rôle de corne d'arc inférieure 30, et le contact mobile 28 est agencé à l'extrémité d'un bras de contact 32 basculant, ac­tionné par le mécanisme.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 magnetothermal 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. 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 No. 2,344,949 to which reference will advantageously be made for more details. A trigger bar 20, mounted with limited rotation on an axis 22, is controlled by the trigger 10 when a fault current appears, so as to release the hook 24 from the mechanism for opening the contacts 26, 28. 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.

L'électro-aimant 16 du déclencheur électromagnétique comporte une bobine 34 entourée par une carcasse 36 métallique, et un noyau magnétique plongeur monté à coulissement axial dans la bobine 34 cylindrique dont l'axe est parallèle aux tôles 18.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.

Le noyau plongeur porte à l'une de ses extrémités un extrac­teur 38 agissant sur le bras de contact 32, et actionne à l'opposé un poussoir 40 de déverrouillage de la barre de dé­clenchement 20. L'une des extrémités de raccordement de la bobine 34, située du côté de l'extracteur 38, est reliée électriquement à une électrode 42 formant la corne d'arc supérieure qui encadre la chambre 12 avec la barrette opposée de la corne d'arc inférieure 30. Le fonctionnement d'un tel déclencheur magnétothermique est bien connu des spécialistes.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.

Selon l'invention, la bobine 34 du déclencheur électromagné­tique comporte quelques spires jointives formées après enrou­lement hélicoïdal d'un conducteur déformable, notamment en cuivre enrobé par un revêtement isolant. La spire 43 terminale, située du côté de la barre de déclenchement 20, à l'opposé de l'extracteur 38 est prolongée par une queue 44 servant d'organe de support pour la bilame 14, en forme de lame allongée. Le conducteur constituant les spires et la queue 44 présente une section uniforme agencée pour donner une certaine rigidité à la bobine 34.According to the invention, 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.

Sur la figure 1, la queue 44 de la bobine 34 est sensiblement rectiligne, et s'étend selon une direction oblique vers l'ori­fice d'échappement 46 situé à la sortie de la chambre 12 d'ex­tinction d'arc. Le pied 48 de la bilame 14 est fixé par soudage en un point intermédiaire 49 d'une partie dénudée de la queue 44, de manière à autoriser un bon tranfert de chaleur de la bobine 34 vers la bilame 14. Le soudage direct de la bilame 14 sur la queue 44 permet de s'affranchir d'une tresse souple de liaison électrique entre bobine et bilame, ainsi que d'un dispositif métallique spécial de support de la bilame.In Figure 1, 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 part of the tail 44, so as to allow a good heat transfer from the coil 34 to the bimetallic strip 14. Direct welding of the bimetallic strip 14 on 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.

L'extrémité 50 de la queue 44 coopère avec un dispositif de réglage 52 du seuil de déclenchement thermique de la bilame 14. Le dispositif de réglage 52, montré en détail aux figures 2 et 3, comporte une vis 54 insérée dans un orifice 56 incliné du boîtier 11 isolant, et vissée dans un trou fileté 57 d'une cage 58 de positionnement en forme de U. L'extrémité 50 de la queue 44 est logée dans la cage 58 telle que le vissage ou dévissage de la vis 54 de réglage provoque une légère défor­mation de la queue 44, entraînant un déplacement relatif de l'extrémité libre de la bilame 14 en rapprochement ou à écar­tement de la barre de déclenchement 20. La queue 44 de la bobine 34 est avantageusement dotée d'une encoche à section réduite formant charnière 60, agencée entre le point 49 de jonction de la bilame 14 et la spire terminale 43. L'ensemble queue 44 et dispositif de réglage 52 est porté par un étrier 62 ou flasque fixe positionné dans une alvéole 64 du boîtier 11. Les branches parallèles supérieure 66 et inférieure 67 de l'étrier 62 comportent des lumières 68, alignées de guidage, pour le passage à jeu de la vis 54. La tête de vis 54 prend appui sur la face extérieure de la branche supérieure 66, alors que la branche inférieure 67 est prolongée par une extension 70, assujettie par soudage à la queue 44 au voisinage de la charnière 60. Cette dernière est située avantageusement entre le point 72 de jonction mécanique de l'extension 70 avec la queue 44, et la cage 58 de positionnement de l'extrémité 50. La vis 54 s'étend perpendiculairement à l'extrémité 50 de la queue 44.The end 50 of the tail 44 cooperates with an adjustment device 52 of the thermal tripping threshold of the bimetallic 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 58-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, causing a relative displacement of the free end of the bimetallic strip 14 in approach or at a distance from the trigger bar 20. The tail 44 of the coil 34 is advantageously provided with a reduced section notch forming a hinge 60, arranged between the point 49 of junction of the bimetallic strip 14 and the end turn 43. The tail 44 and adjustment device 52 assembly is carried by a stirrup 62 or fixed flange positioned in a cell 64 of the housing 11. The upper 66 and lower 67 parallel branches of the stirrup 62 include slots 68, aligned in guide, for the passage of clearance of the screw 54. The screw head 54 bears 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 cage 58 for positioning the end 50. The screw 54 extends perpendicularly at the end 50 of the tail 44.

Lors du vissage ou dévissage de la vis de réglage 54, la cage de positionnement 58 se déplace à translation alternée à l'in­térieur de l'étrier 62 fixe, et provoque un léger pivotement de l'extrémité 50 de la queue 44 autour de la charnière 60. L'autre partie rigide de la queue 44 située entre la charnière 60 et la spire terminale 43 reste immobile durant le réglage, grâce au maintien efficace de l'extension 70 de l'étrier 62 de fixation.During the screwing or unscrewing of the adjusting screw 54, 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.

L'étrier 62 et la cage 58 de positionnement de l'extrémité 50 sont réalisés en un matériau métallique indéformable et de résistance mécanique élevée, notamment en acier, et ayant une résistivité électrique plus grande que celle du conducteur de la queue 44. Une tresse 76 de liaison est soudée au pied 48 de la bilame 14, et est connectée à une plage de raccorde­ment (non représentée). Le courant circulant dans la bobine 34 en provenance de la plage traverse le pied 48 de la bilame 14 dans le sens de l'épaisseur. La déflexion de la bilame 14 résul­te éssentiellement de la conduction calorifique par la queue 44 de la bobine 34.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 connecting braid 76 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.

Selon les variantes des figures 4 à 6, les mêmes numéros de repères désignent des pièces identiques ou similaires à celles¨ de la figure 1. L'extrémité 50 de la queue 44 est soudée direc­tement à l'un des côtés du pied 48 de la bilame 14, tandis qu'un levier 80 de réglage du seuil thermique est fixé par soudage au côté opposé du pied 48. Une tresse de liaison 82 relie le levier 80 métallique à une plage de contact 84 associée à une borne de raccordement du pôle. Le courant du pôle circule dans la queue 44 de la bobine 34 et dans le levier 80 après avoir traversé le pied 48 de la bilame 14 dans son épaisseur. Le reste de la bilame 14 n'est pas parcouru par le courant. La soudure triple au niveau du pied 48 permet de garantir une excellente cohérence entre l'intensité du courant du pôle et le seuil de déclenchement thermique. La déflexion de la bilame 14 résulte à la fois de la conduction calorifique, suite à l'échauffement de la bobine 34, du chauffage direct partiel par passage du courant dans le pied 48, et du chauffage indi­rect par rayonnement thermique du levier 80.According to the variants of FIGS. 4 to 6, 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.

Le levier de réglage 80 conduit le courant entre le pied 48 de la bilame 14 et la tresse 82 en liaison avec la plage 84. Le levier 80 sert de chauffeur à la bilame 14, et le matériau du levier 80 est choisi pour ajuster l'échauffement indirect par rayonnement. La transmission du couple de réglage par le levier 80 est opérée par la vis 54 qui provoque un léger pivo­tement du pied 48 de la bilame 14 autour de l'axe de rotation de la charnière 60. Selon les figures 4 et 5, l'axe est réel, et comporte une aiguille 86 ou pivot au droit de la section rétrécie 88 de la queue 44. Des butées 90 formées par des nervures du boîtier 11 isolant assurent le maintien stable de la queue 44, et empêchent toute transmission d'efforts mécaniques vers la carcasse 36 de la bobine 34.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 adjustment torque by the lever 80 is effected by the screw 54 which causes the foot 48 of the bimetallic strip 14 to pivot slightly around the axis of rotation of the hinge 60. According to FIGS. 4 and 5, the axis is real, and has 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 ensures the stable maintenance of the tail 44, and prevents any transmission of mechanical forces to the carcass 36 of the coil 34.

Selon la figure 6, l'axe de rotation de la charnière est fictif, et est constitué par l'arête saillante d'une butée 92 prenant appui sur l'extrémité 50 de la queue 44. Entre les deux butées 90, 92, se trouve la zone déformable à section rétrécie 88, destinée à absorber tout déplacement latéral vers la bobine 34.According to Figure 6, 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.

Claims (8)

1. Déclencheur magnétothermique, associé à un mécanisme d'ouver­ture d'un disjoncteur miniature à boîtier isolant moulé, com­prenant :
- un premier déclencheur thermique à bilame sensible à des courants de surcharge,
- un deuxième déclencheur électromagnétique pour la protection contre les courants de courts-circuits, comportant un électro-­aimant à bobine de commande, constituée par enroulement héli­coïdal d'un conducteur déformable, ayant une rigidité prédéter­minée,
- et un dispositif de réglage du seuil de déclenchement thermique du premier déclencheur,
caractérisé en ce que la bobine (34) dudit électro-aimant est prolongée par une queue (44), agencée en organe de support réglable de la bilame (14), le pied (48) de cette dernière étant insérée par soudage entre ladite queue (44) et un moyen de liaison électrique (76, 80) avec une plage de contact, pour provoquer le passage du courant dans le sens de l'épaisseur du pied (48) de la bilame (14), et que la queue (44) comporte une charnière (60) entre le point de jonction du pied (48) de la bilame (14) et la bobine (34), de manière à autoriser un dépla­cement relatif d'une partie de ladite queue (44) sous l'action du dispositif de réglage (52) du seuil de déclenchement ther­mique, l'autre partie, reliée à la bobine (34) restant sensi­blement immobile.1. Magnetothermal trip device, associated with a mechanism for opening a miniature circuit breaker with molded insulating housing, comprising:
- a first bimetal thermal trip device sensitive to overload currents,
a second electromagnetic trip device for protection against short-circuit currents, comprising an electromagnet with control coil, constituted by helical winding of a deformable conductor, having a predetermined stiffness,
- and a device for adjusting the thermal trigger threshold of the first trigger,
characterized in that the coil (34) of said electromagnet is extended by a tail (44), arranged as an adjustable support member for the bimetallic strip (14), the foot (48) of the latter being inserted by welding between said tail (44) and an electrical connection means (76, 80) with a contact pad, to cause the passage of current in the thickness direction of the foot (48) of the bimetallic strip (14), and that the tail ( 44) comprises a hinge (60) between the junction point of the foot (48) of the bimetallic strip (14) and the coil (34), so as to allow a relative displacement of a part of said tail (44) under the action of the adjustment device (52) of the thermal trip threshold, the other part, connected to the coil (34) remaining substantially stationary. 2. Déclencheur magnétothermique selon la revendication 1, caractérisé en ce que la charnière (60) est formée par une zone à section réduite, autorisant une déformation mécanique de ladite queue (44) au cours du vissage ou du dévissage d'une vis (54) dudit dispositif de réglage (52).2. A thermomagnetic trip device according to claim 1, characterized in that the hinge (60) is formed by a zone of reduced section, allowing mechanical deformation of said tail (44) during the screwing or unscrewing of a screw (54 ) of said adjustment device (52). 3. Déclencheur magnétothermique selon la revendication 2, caractérisé en ce que l'extrémité (50) de la queue (44) est logée dans une cage de positionnement (58) coopérant avec la vis (54) du dispositif de réglage (52) du seuil de déclenche­ment thermique.3. Magnetothermal trip device according to claim 2, characterized in that the end (50) of the tail (44) is housed in a positioning cage (58) cooperating with the screw (54) of the adjustment device (52) of the thermal trip threshold. 4. Déclencheur magnétothermique selon la revendication 3, caractérisé en ce que l'ensemble queue (44) et dispositif de réglage (52) est porté par un étrier métallique ou flasque (62) fixe, positionné dans une alvéole (64) du boîtier (11) isolant, et que l'étrier (62) est équipé d'une extension (70) servant de support à ladite partie de la queue (44) agencée entre la charnière (60) et la bobine (34).4. A thermomagnetic trip device according to claim 3, characterized in that the tail (44) and adjustment device (52) assembly is carried by a fixed metal or flange (62), positioned in a cell (64) of the housing ( 11) insulator, and that the stirrup (62) is equipped with an extension (70) serving as a support for said part of the tail (44) arranged between the hinge (60) and the coil (34). 5. Déclencheur magnétothermique selon la revendication 4, caractérisé en ce qué la vis (54) traverse à jeu deux lumières (68) de guidage de l'étrier (62) en forme U, selon une direction perpendiculaire à l'extrémité (50) de la queue (44).5. A thermomagnetic trip device according to claim 4, characterized in that the screw (54) passes through two slots (68) for guiding the stirrup (62) in U shape, in a direction perpendicular to the end (50) tail (44). 6. Déclencheur magnétothermique selon l'une des revendications 2 à 5, caractérisé en ce que l'axe d'articulation de la char­nière (60) comporte une aiguille ou pivot (86) coopérant avec la zone à section réduite de la queue (44).6. Magnetothermal trip device according to one of claims 2 to 5, characterized in that the hinge axis of the hinge (60) comprises a needle or pivot (86) cooperating with the reduced section area of the tail (44 ). 7. Déclencheur magnétothermique selon l'une des revendications 4 à 6, caractérisé en ce que le moyen de liaison électrique entre le pied (48) de la bilame (14) et la plage de contact (84) correspondante comprend une tresse (76) conductrice, et que l'étrier (62) et la cage de positionnement (58) sont réa­lisés en un matériau métallique indéformable, ayant une résis­tivité électrique plus grande que celle du conducteur de la queue (44).7. Magnetothermal trip device according to one of claims 4 to 6, characterized in that the means of electrical connection between the foot (48) of the bimetallic strip (14) and the corresponding contact pad (84) comprises a braid (76) conductive, and that the stirrup (62) and the positioning cage (58) are made of a non-deformable metallic material, having an electrical resistivity greater than that of the conductor of the tail (44). 8. Déclencheur magnétothermique selon l'une des revendications 1 ou 2, caractérisé en ce que le moyen de liaison électrique entre le pied (48) de la bilame (14) et la plage de contact (84) correspondante, comporte un levier (80) conducteur, s'étendant à proximité de la bilame (14) de manière à consti­tuer un organe combiné de chauffage indirect par rayonnement de la bilame (14), et de transmission du couple de réglage du seuil thermique par la vis (54).8. Magnetothermal trip device according to one of claims 1 or 2, characterized in that the means of electrical connection between the foot (48) of the bimetallic strip (14) and the corresponding contact pad (84) comprises a lever (80 ) driver, extending near the bimetallic strip (14) so as to constitute a combined member for indirect heating by radiation of the bimetallic strip (14), and for transmitting the torque for adjusting the thermal threshold by the screw (54).
EP86401474A 1985-07-31 1986-07-03 Magnetothermal release mechanism associated with the mechanism of a miniature circuit breaker with an insulating casing Expired - Lifetime EP0213979B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401474T ATE57445T1 (en) 1985-07-31 1986-07-03 MAGNETOTHERMAL RELEASE ASSOCIATED TO THE MECHANISM OF A MINIATURE SWITCH WITH INSULATED HOUSING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511839 1985-07-31
FR8511839A FR2585877B1 (en) 1985-07-31 1985-07-31 MAGNETOTHERMAL TRIGGER ASSOCIATED WITH THE MECHANISM OF A MINIATURE CIRCUIT BREAKER WITH INSULATING HOUSING

Publications (2)

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

Family

ID=9321898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401474A Expired - Lifetime EP0213979B1 (en) 1985-07-31 1986-07-03 Magnetothermal release mechanism associated with the mechanism of a miniature circuit breaker with an insulating casing

Country Status (5)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309197A1 (en) * 1993-03-22 1994-09-29 Maier & Cie C Line protection circuit breaker
EP1096529A1 (en) * 1999-10-29 2001-05-02 Moeller GmbH Protective electrical circuit-breaker
CN100377270C (en) * 2005-12-07 2008-03-26 上海电器科学研究所（集团）有限公司 Thermomagnetic type release and its current adjusting knob
CZ300253B6 (en) * 2005-08-15 2009-04-01 Oez S. R. O. Adjusting mechanism, particularly for thermal trip of electric switchgear

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597445C (en) * 1928-07-25 1934-05-25 Schiele & Bruchsaler Industrie Overcurrent release for electrical switches
DE1463684A1 (en) * 1964-11-17 1969-03-06 Stotz Kontakt Gmbh Installation circuit breaker with thermal and magnetic release
FR2262396A1 (en) * 1974-02-27 1975-09-19 Ottermill Ltd
FR2344949A1 (en) * 1976-03-15 1977-10-14 Merlin Gerin Low voltage miniature contact breaker for domestic use - has bimetal strips and solenoid for release and laminated stack for arc blowout
EP0007283A1 (en) * 1978-06-23 1980-01-23 Merlin Gerin Circuit breaker with removable release unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597445C (en) * 1928-07-25 1934-05-25 Schiele & Bruchsaler Industrie Overcurrent release for electrical switches
DE1463684A1 (en) * 1964-11-17 1969-03-06 Stotz Kontakt Gmbh Installation circuit breaker with thermal and magnetic release
FR2262396A1 (en) * 1974-02-27 1975-09-19 Ottermill Ltd
FR2344949A1 (en) * 1976-03-15 1977-10-14 Merlin Gerin Low voltage miniature contact breaker for domestic use - has bimetal strips and solenoid for release and laminated stack for arc blowout
EP0007283A1 (en) * 1978-06-23 1980-01-23 Merlin Gerin Circuit breaker with removable release unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309197A1 (en) * 1993-03-22 1994-09-29 Maier & Cie C Line protection circuit breaker
EP1096529A1 (en) * 1999-10-29 2001-05-02 Moeller GmbH Protective electrical circuit-breaker
CZ300253B6 (en) * 2005-08-15 2009-04-01 Oez S. R. O. Adjusting mechanism, particularly for thermal trip of electric switchgear
CN100377270C (en) * 2005-12-07 2008-03-26 上海电器科学研究所（集团）有限公司 Thermomagnetic type release and its current adjusting knob

Also Published As

Publication number Publication date
EP0213979B1 (en) 1990-10-10
ZA865159B (en) 1987-02-25
FR2585877B1 (en) 1987-10-23
DE3674867D1 (en) 1990-11-15
ATE57445T1 (en) 1990-10-15
FR2585877A1 (en) 1987-02-06

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