EP2411995B1 - Thermal-magnetic tripping mechanism - Google Patents

Thermal-magnetic tripping mechanism Download PDF

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Publication number
EP2411995B1
EP2411995B1 EP10715967.5A EP10715967A EP2411995B1 EP 2411995 B1 EP2411995 B1 EP 2411995B1 EP 10715967 A EP10715967 A EP 10715967A EP 2411995 B1 EP2411995 B1 EP 2411995B1
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EP
European Patent Office
Prior art keywords
thermal
vane
tripping mechanism
cylinder head
magnetic
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EP10715967.5A
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German (de)
French (fr)
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EP2411995A1 (en
Inventor
Francis Deckert
Loïc Meyer
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Hager Electro SAS
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Hager Electro SAS
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    • 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
    • H01H71/08—Terminals; Connections

Definitions

  • the present invention relates on the one hand to a magnetothermal actuator or trigger, for example for circuit-breaker type electric apparatus, allowing the breaking of at least one line in the event of a short-circuit or overload in a circuit, and on the other hand the devices that have them.
  • the line protection circuit breakers comprise, by line and between two connection terminals, a fixed contact and a movable contact that can be separated in particular by the action of a magnetothermal actuator on a mechanical trigger lock.
  • the magnetic part of the actuator essentially comprises a conducting element producing the induction, which cooperates with a magnetic circuit with a fixed yoke and a moving part acting as a triggering member or cooperating with a striker to ensure, in the event of a short circuit , disjunction of the device by tilting of the mechanical lock which causes the opening of the movable contact.
  • Thermal tripping is conventionally carried out by a bimetallic strip, with direct or indirect heating.
  • the bimetallic traversed by a current serves as inductive conductor of the magnetic circuit.
  • the current is sufficient so that the magnetic force induced in the magnetic circuit causes a displacement of its moving part - against return means - allowing the release of the lock.
  • the magnetothermal trip units are for example connected between the movable contact of each line and an output terminal cooperating with a connection device of cage and screw type.
  • the circuit portion is then in fact electrically constituted of the movable contact, the bimetallic strip and the output terminal, which are connected for example by flexible braids welded at their ends to the components they connect.
  • the magnetic actuator is disposed at the bimetal so that the latter can play its role of inductor.
  • EP-A-0572773 discloses a circuit breaker-type circuit breaker type circuit breaker magnetic circuit breaker according to the preamble of claim 1.
  • the latter conventionally comprises a movable pallet magnetic circuit pivoting with respect to a fixed yoke forming the rest of the magnetic circuit, said yoke having a U-shaped cross-section and surrounding a thermal bimetallic strip electrically connected to a terminal of the apparatus, return means maintaining the pallet in the open position with respect to the cylinder head in the absence of a short-circuit current.
  • the terminal and the yoke are fixed to each other and to an intermediate piece provided with pivot bearings for the pallet, the assembly forming a subset of a single piece .
  • the advantage of such a subset is particularly obvious in the industrialization phase, since said subassembly can be pre-assembled and then handled in a single operation at the time of assembly.
  • the fixed yoke is not directly connected to the movable pallet, which is articulated to the intermediate piece. If the pallet was directly articulated to the cylinder head, a fraction of the magnetic field would pass through the metal bearings, and would not be directly available in the gap to actuate the pallet.
  • This magnetic separation between the fixed yoke and the movable pallet is carried out by means of said intermediate piece.
  • This is made of a non-magnetic material of the brass type.
  • the terminal is L-shaped at the back of which is secured the bottom of the gutter-shaped yoke, the intermediate piece being fixed between said bottom and the back of the terminal, said part at least partially enveloping the outside of the cylinder head and having two branches protruding in a direction of axial course, the ends of said branches having facing orifices in which pivots the pallet.
  • the pallet is thus easily clipped into said holes of the intermediate piece during assembly.
  • the return means consist of a compression spring interposed between the pallet, via a tab protruding from the free end thereof opposite the hinge with the intermediate piece, and a hook extending said room beyond the breech, which exceeds a second leg.
  • two abutments are arranged near the pivot axis in order to limit the amplitude of the tilting of the pallet under the effect of the compression spring, which permanently urges said pallet towards said stops. These stops allow prepositioning the pallet to form a subset intended to be integrated into the housing.
  • the mobile pallet comprises at least two thicknesses obtained by folding on itself the magnetic sheet constituting said pallet.
  • the increase in thickness thus easily obtained at the passage of the magnetic flux makes it possible to delay the magnetic saturation of the material.
  • the number of folding is multipliable and depends on the technical context and the constraints associated therewith.
  • the pallet preferably also has a tab for adjusting the amplitude of its tilting, the free end of which cooperates with the housing of the electrical apparatus.
  • a wall of the housing of the subassembly of the invention in the housing is positioned to serve as a stop for this tab, whose position relative to the pallet is easily modifiable to adjust the amplitude of the pivoting movement.
  • One of the advantages of this invention is to avoid any subsequent adjustment of the subassembly as such once set up in the housing.
  • Said tongue is for this purpose constituted by a portion of the sheet of the pallet adjacent to an edge perpendicular to the axis of pivoting, obtained by cutting a segment parallel to said edge and undergoing a folding whose angle is variable and is the setting parameter of the amplitude of the tilting of the pallet.
  • the bimetallic passes into the gutter forming the yoke, in which it is oriented substantially parallel to the axis of said gutter.
  • said bimetallic strip is also electrically connected to the output terminal of the cylinder head by at least one flexible conductive braid welded on the one hand to the free end of the bimetallic strip and on the other hand to the back of said terminal.
  • the bimetal is attached to the sole of the housing of the apparatus at its end opposite the free end, and connected at this level to a movable contact of the apparatus of cutting also via at least one flexible conductive braid.
  • the invention also relates to breaker-type electrical breaker devices which are equipped with magnetothermic actuators as described above, ie comprising for each line to be protected a movable contact capable of cooperating with a circuit breaker. fixed contact, a mechanical disjunction lock adapted to switch to separate the movable contact of the fixed contact in case of overcurrent in a line, the magnetothermal actuator then being able to act on said lock to switch it.
  • the magnetothermic actuator of the invention consists of a fixed magnetic yoke (1) in "gutter” and a pallet (2) movable also in magnetic material, the yoke (1) and the pallet ( 2) surrounding a bimetallic strip (3).
  • the bimetallic strip (3) is electrically connected to a terminal (4) of the electrical apparatus via a conductive braid (5).
  • the pallet (2) is rotatable relative to an intermediate piece (6) provided with pivot bearings (7, 7 ').
  • Two stops (8, 8 ') arranged near the pivot axis make it possible to limit the amplitude of the tilting of the pallet (2) under the effect of the compression spring (9), which constantly stresses said pallet ( 2) towards said stops (8, 8 ').
  • the spring (9), adapted to each caliber, is arranged between the pallet (2) and the fixed yoke (1), more precisely on two lugs (10, 11) secured respectively to a hook (13) protruding from the workpiece. intermediate (6) and pallet (2).
  • the latter has two layers or thicknesses folded (2 ', 2 "), one of which is provided with a tongue (12) for adjusting the amplitude of the tilting, by cooperation with a wall of the housing of the apparatus (not shown).
  • 8, 8 ') serve only to allow the establishment of a preassembled subassembly, ready to be integrated in the housing, and are not used for adjustment once the subassembly is inserted into the base of the housing.
  • the precise positioning of the intermediate piece (6) with respect to the fixed yoke (1) appears more clearly on the figure 2 it marries at least partially the outer surface of the yoke (1) and is therefore sandwiched between said yoke (1) and the terminal (4). According to one possibility, This is a brass piece.
  • the cup of the figure 2 also clearly shows the lower support (14), inserted in the base of the housing, on which is fixed one end of the bimetal (3) connected to the rest of the circuit by a flexible braid (not shown).
  • the upper part of said sheet (15) is secured to the terminal (4). Its median portion (16) developing parallel to and close to the bimetallic strip (3) (see figure 4 ) performs most of the radiation heating of the bimetallic strip (3). Such a configuration may be of interest when, for example for high ratings, the current passing through the bimetallic strip (3) is high and would unreasonably heat it.
  • the configuration of the invention makes it possible to obtain, for a small width that is compatible with its introduction into modules, sufficient magnetic efficiency so that the striker can trigger the magnetic lock in the event of a short circuit in the line protected by the circuit breaker equipped with such an actuator.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)

Description

La présente invention concerne d'une part un actionneur ou déclencheur magnétothermique par exemple pour appareil électrique de type disjoncteur, permettant la coupure d'au moins une ligne en cas de court-circuit ou de surcharge dans un circuit, et d'autre part les appareils qui en sont munis.The present invention relates on the one hand to a magnetothermal actuator or trigger, for example for circuit-breaker type electric apparatus, allowing the breaking of at least one line in the event of a short-circuit or overload in a circuit, and on the other hand the devices that have them.

Les disjoncteurs de protection de lignes comportent, par ligne et entre deux bornes de connexion, un contact fixe et un contact mobile pouvant être séparés notamment par action d'un actionneur magnétothermique sur une serrure mécanique de déclenchement.The line protection circuit breakers comprise, by line and between two connection terminals, a fixed contact and a movable contact that can be separated in particular by the action of a magnetothermal actuator on a mechanical trigger lock.

La partie magnétique de l'actionneur comprend essentiellement un élément conducteur réalisant l'induction, qui coopère avec un circuit magnétique à culasse fixe et partie mobile jouant le rôle d'organe déclencheur ou coopérant avec un percuteur pour assurer, en cas de court-circuit, la disjonction de l'appareil par basculement de la serrure mécanique qui provoque l'ouverture du contact mobile.The magnetic part of the actuator essentially comprises a conducting element producing the induction, which cooperates with a magnetic circuit with a fixed yoke and a moving part acting as a triggering member or cooperating with a striker to ensure, in the event of a short circuit , disjunction of the device by tilting of the mechanical lock which causes the opening of the movable contact.

Le déclenchement thermique est classiquement réalisé par un bilame, à chauffage direct ou indirect. Dans certains actionneurs magnétothermiques, en particulier dans les appareils électriques à boîtiers moulés dans lesquels chaque ligne en est équipée, le bilame parcouru par un courant sert de conducteur d'induction du circuit magnétique. En cas de court circuit, le courant est suffisant pour que la force magnétique induite dans le circuit magnétique provoque un déplacement de sa partie mobile - à l'encontre de moyens de rappel - permettant le déclenchement de la serrure.Thermal tripping is conventionally carried out by a bimetallic strip, with direct or indirect heating. In certain magnetothermic actuators, in particular in electrical appliances with molded housings in which each line is equipped, the bimetallic traversed by a current serves as inductive conductor of the magnetic circuit. In the event of a short circuit, the current is sufficient so that the magnetic force induced in the magnetic circuit causes a displacement of its moving part - against return means - allowing the release of the lock.

Ces moyens de rappel sont prévus pour que ladite partie mobile, constituée en général d'une palette rotative pour ce type d'appareils, revienne en position de repos à distance de la serrure lorsque le courant parcourant le bilame est inférieur à un seuil signifiant clairement l'existence d'un court-circuit.These return means are provided so that said movable part, generally consisting of a rotary pallet for this type of apparatus, returns to the rest position away from the lock when the current flowing through the bimetallic strip is below a threshold meaning clearly the existence of a short circuit.

Les déclencheurs magnétothermiques sont par exemple raccordés entre le contact mobile de chaque ligne et une borne de sortie coopérant avec un dispositif de connexion de type à cage et vis. La portion de circuit est alors en fait électriquement constituée du contact mobile, du bilame et de la borne de sortie, qui sont raccordés par exemple par des tresses souples soudées à leurs extrémités aux composant qu'elles relient. L'actionneur magnétique est disposé au niveau du bilame de façon que ce dernier puisse jouer son rôle d'inducteur.The magnetothermal trip units are for example connected between the movable contact of each line and an output terminal cooperating with a connection device of cage and screw type. The circuit portion is then in fact electrically constituted of the movable contact, the bimetallic strip and the output terminal, which are connected for example by flexible braids welded at their ends to the components they connect. The magnetic actuator is disposed at the bimetal so that the latter can play its role of inductor.

La nécessité de faire coopérer les différents composants des fonctions magnétique et thermique, qui doivent de surcroît être imbriqués sans se gêner pour pouvoir fonctionner ensemble, conduit à des problématiques de conception à chaque fois particulières, fonctions par exemple du contexte technique (calibre des appareils, volume disponible dans les boîtiers..), de nécessités industrielles (degré d'automatisation du montage..) et évidemment économiques.The need to cooperate the various components of the magnetic and thermal functions, which must moreover be nested without hindrance to be able to work together, leads to problems of design each time special, functions for example of the technical context (caliber devices, volume available in the housings ..), of industrial necessities (degree of automation of the assembly ..) and obviously economic.

EP-A-0572773 décrit un déclencheur magnétothermique pour appareil électrique de coupure de type disjoncteur d'après le préambule de la revendication 1. Dans la présente invention, destinée à des appareils dits à boîtier moulé dans lesquels chaque ligne est équipée d'un actionneur magnétothermique, celui-ci comporte classiquement un circuit magnétique à palette mobile pivotant par rapport à une culasse fixe formant le reste du circuit magnétique, ladite culasse étant à section en U et entourant un bilame thermique électriquement relié à une borne de l'appareil, des moyens de rappel maintenant la palette en position ouverte par rapport à la culasse en l'absence de courant de court-circuit. EP-A-0572773 discloses a circuit breaker-type circuit breaker type circuit breaker magnetic circuit breaker according to the preamble of claim 1. In the present invention, for so-called molded case devices in which each line is equipped with a magnetothermal actuator, the latter conventionally comprises a movable pallet magnetic circuit pivoting with respect to a fixed yoke forming the rest of the magnetic circuit, said yoke having a U-shaped cross-section and surrounding a thermal bimetallic strip electrically connected to a terminal of the apparatus, return means maintaining the pallet in the open position with respect to the cylinder head in the absence of a short-circuit current.

Selon l'invention, à titre essentiel, la borne et la culasse sont fixées l'une à l'autre et à une pièce intermédiaire dotée de paliers de pivotement pour la palette, l'ensemble formant un sous-ensemble d'un seul tenant. L'avantage d'un tel sous-ensemble est notamment patent en phase d'industrialisation, puisque ledit sous-ensemble peut être prémonté puis manipulé en une seule opération au moment du montage.According to the invention, essentially, the terminal and the yoke are fixed to each other and to an intermediate piece provided with pivot bearings for the pallet, the assembly forming a subset of a single piece . The advantage of such a subset is particularly obvious in the industrialization phase, since said subassembly can be pre-assembled and then handled in a single operation at the time of assembly.

La culasse fixe n'est pas directement reliée à la palette mobile, qui est articulée à la pièce intermédiaire. Si la palette était directement articulée à la culasse, une fraction du champ magnétique passerait par les paliers métalliques, et ne serait pas directement disponible dans l'entrefer pour actionner la palette.The fixed yoke is not directly connected to the movable pallet, which is articulated to the intermediate piece. If the pallet was directly articulated to the cylinder head, a fraction of the magnetic field would pass through the metal bearings, and would not be directly available in the gap to actuate the pallet.

Cette séparation magnétique entre la culasse fixe et la palette mobile est réalisée au moyen de ladite pièce intermédiaire. Celle-ci est constituée d'un matériau amagnétique de type laiton.This magnetic separation between the fixed yoke and the movable pallet is carried out by means of said intermediate piece. This is made of a non-magnetic material of the brass type.

Le fait d'intercaler cette pièce intermédiaire modifie donc le passage du champ magnétique qui se canalise alors uniquement dans l'entrefer de manière à optimiser le niveau de déclenchement de la serrure par le déplacement de la palette mobile.The fact of inserting this intermediate piece thus modifies the passage of the magnetic field which is then channeled only in the air gap so as to optimize the trigger level of the lock by moving the moving vane.

Plus précisément, selon une configuration propre à l'invention, la borne est en forme de L au dos duquel est solidarisée le fond de la culasse en forme de gouttière, la pièce intermédiaire étant fixée entre ledit fond et le dos de la borne, ladite pièce enveloppant au moins partiellement l'extérieur de la culasse et comportant deux branches en dépassant dans une direction d'allure axiale, les extrémités desdites branches présentant des orifices en regard dans lesquels pivote la palette.More specifically, according to a configuration of the invention, the terminal is L-shaped at the back of which is secured the bottom of the gutter-shaped yoke, the intermediate piece being fixed between said bottom and the back of the terminal, said part at least partially enveloping the outside of the cylinder head and having two branches protruding in a direction of axial course, the ends of said branches having facing orifices in which pivots the pallet.

La palette est ainsi facilement clipsée dans lesdits orifices de la pièce intermédiaire lors de l'assemblage.The pallet is thus easily clipped into said holes of the intermediate piece during assembly.

Par ailleurs, les moyens de rappel sont constitués d'un ressort de compression interposé entre la palette, via une patte dépassant de l'extrémité libre de celle-ci à l'opposé de la charnière avec la pièce intermédiaire, et un crochet prolongeant ladite pièce au delà de la culasse, dont dépasse une seconde patte. L'emploi d'un ressort de compression pour effectuer le réglage magnétique présente plusieurs avantages : il s'agit d'une solution qui est moins chère et plus précise que les ressorts de traction ou de torsion habituellement utilisés dans cette application. Le ressort de compression est adapté au calibre de l'appareil de coupure.Furthermore, the return means consist of a compression spring interposed between the pallet, via a tab protruding from the free end thereof opposite the hinge with the intermediate piece, and a hook extending said room beyond the breech, which exceeds a second leg. The use of a compression spring for magnetic adjustment has several advantages: it is a solution that is less expensive and more accurate than the tension or torsion springs usually used in this application. The compression spring is adapted to the size of the breaking device.

Deux butées sont au surplus disposées à proximité de l'axe de pivotement en vue de limiter l'amplitude du basculement de la palette sous l'effet du ressort de compression, qui sollicite en permanence ladite palette en direction desdites butées. Ces butées permettent de prépositionner la palette en vue de constituer un sous-ensemble prévu pour être intégré au boîtier.In addition, two abutments are arranged near the pivot axis in order to limit the amplitude of the tilting of the pallet under the effect of the compression spring, which permanently urges said pallet towards said stops. These stops allow prepositioning the pallet to form a subset intended to be integrated into the housing.

Selon une configuration possible, la palette mobile comporte au moins deux épaisseur obtenues par pliage sur elle même de la tôle magnétique constituant ladite palette. L'augmentation d'épaisseur ainsi facilement obtenue au niveau du passage du flux magnétique permet de retarder la saturation magnétique du matériau. Le nombre de pliage est multipliable et dépend du contexte techniques et des contraintes qui y sont associées.According to one possible configuration, the mobile pallet comprises at least two thicknesses obtained by folding on itself the magnetic sheet constituting said pallet. The increase in thickness thus easily obtained at the passage of the magnetic flux makes it possible to delay the magnetic saturation of the material. The number of folding is multipliable and depends on the technical context and the constraints associated therewith.

La palette présente par ailleurs de préférence une languette de réglage de l'amplitude de son basculement, dont l'extrémité libre coopère avec le boîtier de l'appareil électrique. Une paroi du logement du sous-ensemble de l'invention dans le boîtier est positionnée pour servir de butée à cette languette, dont la position par rapport à la palette est facilement modifiable en vue de régler l'amplitude du mouvement de pivotement.The pallet preferably also has a tab for adjusting the amplitude of its tilting, the free end of which cooperates with the housing of the electrical apparatus. A wall of the housing of the subassembly of the invention in the housing is positioned to serve as a stop for this tab, whose position relative to the pallet is easily modifiable to adjust the amplitude of the pivoting movement.

L'un des avantages de cette invention est d'éviter tout réglage ultérieur du sous-ensemble en tant que tel une fois mis en place dans le boîtier.One of the advantages of this invention is to avoid any subsequent adjustment of the subassembly as such once set up in the housing.

Ladite languette est à cet effet constituée d'une portion de la tôle de la palette voisine d'un bord perpendiculaire à l'axe de pivotement, obtenue par découpe d'un segment parallèle audit bord et subissant un pliage dont l'angle est variable et constitue le paramètre de réglage de l'amplitude du basculement de la palette. Plus le pliage est important, augmentant ledit angle, plus la patte arrivera vite en butée contre la paroi du logement mentionnée ci-dessus, et moins le déplacement angulaire sera important.Said tongue is for this purpose constituted by a portion of the sheet of the pallet adjacent to an edge perpendicular to the axis of pivoting, obtained by cutting a segment parallel to said edge and undergoing a folding whose angle is variable and is the setting parameter of the amplitude of the tilting of the pallet. The greater the folding, increasing said angle, the faster the tab will abut against the wall of the housing mentioned above, and less angular displacement will be important.

Selon l'invention, le bilame passe dans la gouttière formant la culasse, dans laquelle il est orientée sensiblement parallèlement à l'axe de ladite gouttière. Classiquement, ledit bilame est par ailleurs électriquement connecté à la borne en sortie de la culasse par au moins une tresse conductrice souple soudée d'une part à l'extrémité libre du bilame et d'autre part au dos de ladite borne.According to the invention, the bimetallic passes into the gutter forming the yoke, in which it is oriented substantially parallel to the axis of said gutter. Conventionally, said bimetallic strip is also electrically connected to the output terminal of the cylinder head by at least one flexible conductive braid welded on the one hand to the free end of the bimetallic strip and on the other hand to the back of said terminal.

Dans la configuration de préférence adoptée pour l'invention, le bilame est fixé à la semelle du boîtier de l'appareil au niveau de son extrémité opposée à l'extrémité libre, et relié à ce niveau à un contact mobile de l'appareil de coupure également via au moins une tresse conductrice souple.In the configuration preferably adopted for the invention, the bimetal is attached to the sole of the housing of the apparatus at its end opposite the free end, and connected at this level to a movable contact of the apparatus of cutting also via at least one flexible conductive braid.

L'invention concerne également les appareils électriques de coupure du type disjoncteur qui sont équipés d'actionneurs magnétothermiques tels qu'ils ont été décrits ci-dessus, c'est à dire comportant pour chaque ligne à protéger un contact mobile apte à coopérer avec un contact fixe, une serrure mécanique de disjonction apte à basculer pour séparer le contact mobile du contact fixe en cas de surintensité dans une ligne, l'actionneur magnétothermique étant alors apte à agir sur ladite serrure pour la faire basculer.The invention also relates to breaker-type electrical breaker devices which are equipped with magnetothermic actuators as described above, ie comprising for each line to be protected a movable contact capable of cooperating with a circuit breaker. fixed contact, a mechanical disjunction lock adapted to switch to separate the movable contact of the fixed contact in case of overcurrent in a line, the magnetothermal actuator then being able to act on said lock to switch it.

L'invention va à présente être décrite plus en détail, en référence aux figures, pour lesquelles :

  • la figure 1 est une vue en perspective d'une première version à chauffage direct d'un actionneur magnétothermique selon l'invention ;
  • la figure 2 montre une vue en coupe de la version de la figure 1 ;
  • la figure 3 représente une vue en perspective d'une seconde version à chauffage indirect d'un actionneur magnétothermique selon l'invention ; et
  • la figure 4 en montre une vue en coupe.
The invention will now be described in more detail, with reference to the figures, for which:
  • the figure 1 is a perspective view of a first directly heated version of a magnetothermal actuator according to the invention;
  • the figure 2 shows a sectional view of the version of the figure 1 ;
  • the figure 3 is a perspective view of a second indirectly heated version of a magnetothermal actuator according to the invention; and
  • the figure 4 shows a sectional view.

A titre essentiel, l'actionneur magnétothermique de l'invention se compose d'une culasse magnétique fixe (1) en « gouttière » et d'une palette (2) mobile également en matériau magnétique, la culasse (1) et la palette (2) entourant un bilame (3) thermique.Essentially, the magnetothermic actuator of the invention consists of a fixed magnetic yoke (1) in "gutter" and a pallet (2) movable also in magnetic material, the yoke (1) and the pallet ( 2) surrounding a bimetallic strip (3).

Dans la version des figures 1 et 2, le bilame (3) est électriquement relié à une borne (4) de l'appareil électrique via une tresse conductrice (5). La palette (2) est rotative par rapport à une pièce intermédiaire (6) dotée de paliers de pivotements (7, 7'). Deux butées (8, 8') disposées à proximité de l'axe de pivotement permettent de limiter l'amplitude du basculement de la palette (2) sous l'effet du ressort de compression (9), qui sollicite en permanence ladite palette (2) en direction desdites butées (8, 8').In the version of figures 1 and 2 the bimetallic strip (3) is electrically connected to a terminal (4) of the electrical apparatus via a conductive braid (5). The pallet (2) is rotatable relative to an intermediate piece (6) provided with pivot bearings (7, 7 '). Two stops (8, 8 ') arranged near the pivot axis make it possible to limit the amplitude of the tilting of the pallet (2) under the effect of the compression spring (9), which constantly stresses said pallet ( 2) towards said stops (8, 8 ').

Le ressort (9), adapté à chaque calibre, est disposé entre la palette (2) et la culasse fixe (1), plus précisément sur deux pattes (10, 11) solidaires respectivement d'un crochet (13) dépassant de la pièce intermédiaire (6) et de la palette (2). Cette dernière présente deux couches ou épaisseurs repliées (2', 2") dont l'une est dotée d'une languette (12) destinée au réglage de l'amplitude du basculement, par coopération avec une paroi du boîtier de l'appareil (non représenté). Les butées (8, 8') servent donc uniquement à permettre l'établissement d'un sous-ensemble prémonté, prêt à être intégré dans le boîtier, et ne servent pas au réglage une fois que le sous-ensemble est inséré dans le socle du boîtier.The spring (9), adapted to each caliber, is arranged between the pallet (2) and the fixed yoke (1), more precisely on two lugs (10, 11) secured respectively to a hook (13) protruding from the workpiece. intermediate (6) and pallet (2). The latter has two layers or thicknesses folded (2 ', 2 "), one of which is provided with a tongue (12) for adjusting the amplitude of the tilting, by cooperation with a wall of the housing of the apparatus (not shown). 8, 8 ') serve only to allow the establishment of a preassembled subassembly, ready to be integrated in the housing, and are not used for adjustment once the subassembly is inserted into the base of the housing.

Le positionnement précis de la pièce intermédiaire (6) par rapport à la culasse fixe (1) apparaît plus clairement à la figure 2 : elle épouse au moins partiellement la surface extérieure de la culasse (1) et se trouve par conséquent placée en sandwich entre ladite culasse (1) et la borne (4). Selon une possibilité, Il s'agit d'une pièce en laiton. La coupe de la figure 2 montre également clairement le support inférieur (14), inséré dans le socle du boîtier, sur laquelle est fixée l'une des extrémités du bilame (3) relié au reste du circuit par une tresse souple (non représentée).The precise positioning of the intermediate piece (6) with respect to the fixed yoke (1) appears more clearly on the figure 2 it marries at least partially the outer surface of the yoke (1) and is therefore sandwiched between said yoke (1) and the terminal (4). According to one possibility, This is a brass piece. The cup of the figure 2 also clearly shows the lower support (14), inserted in the base of the housing, on which is fixed one end of the bimetal (3) connected to the rest of the circuit by a flexible braid (not shown).

La version des figures 3 et 4 est très similaire à la précédente, la seule différence résidant dans l'existence d'un chauffage indirect du bilame (3) par une tôle conductrice (15) mince disposée dans le volume enclos par la culasse fixe (1) en forme de gouttière, entre le fond de ladite gouttière et le bilame (3). L'extrémité inférieure de celui-ci y est fixée, et non plus directement au support inférieur (14) comme dans la version précédente.The version of figures 3 and 4 is very similar to the previous one, the only difference residing in the existence of an indirect heating of the bimetallic strip (3) by a thin conductive sheet (15) arranged in the volume enclosed by the fixed yoke (1) in the form of a gutter, between the bottom of said gutter and the bimetallic strip (3). The lower end of it is fixed there, and no longer directly to the lower support (14) as in the previous version.

La partie supérieure de ladite tôle (15) est solidarisée à la borne (4). Sa portion médiane (16) se développant parallèlement et à proximité du bilame (3) (voir en figure 4) réalise l'essentiel du chauffage par rayonnement du bilame (3). Une telle configuration peut avoir un intérêt lorsque, par exemple pour les calibres élevés, le courant traversant le bilame (3) est élevé et conduirait à le chauffer de manière déraisonnable.The upper part of said sheet (15) is secured to the terminal (4). Its median portion (16) developing parallel to and close to the bimetallic strip (3) (see figure 4 ) performs most of the radiation heating of the bimetallic strip (3). Such a configuration may be of interest when, for example for high ratings, the current passing through the bimetallic strip (3) is high and would unreasonably heat it.

La configuration de l'invention permet d'obtenir, pour une largeur faible qui est compatible avec son introduction dans des modules, un rendement magnétique suffisant pour que le percuteur puisse faire déclencher la serrure magnétique en cas de court-circuit dans la ligne protégée par le disjoncteur équipé d'un tel actionneur.The configuration of the invention makes it possible to obtain, for a small width that is compatible with its introduction into modules, sufficient magnetic efficiency so that the striker can trigger the magnetic lock in the event of a short circuit in the line protected by the circuit breaker equipped with such an actuator.

Claims (10)

  1. Thermal-magnetic tripping mechanism for a circuit-breaker type electrical cut-off device, comprising a magnetic circuit with a mobile vane (2) pivoting relative to a fixed cylinder head (1) forming the rest of the magnetic circuit, said cylinder head (1) having a U-shaped cross-section and surrounding a thermal bimetal switch (3) connected electrically to a terminal (4) of the device, return means (9) holding the vane (2) in an open position relative to the cylinder head (1) in the absence of a short-circuit current, the terminal (4) and the cylinder head (1) being fixed to one another and to an intermediate piece (6) fitted with pivotable bearings (7, 7') for the vane (2), the assembly forming a subassembly in a single piece, characterised in that the terminal (4) is in the form of an L the back of which is joined to the base of the cylinder head (1) in the form of a trough, the intermediate piece (6) being fixed between said base and the back of the terminal (4), said piece (6) enveloping at least partially the outside of the cylinder head (1) and comprising two arms passing in a direction that appears to be axial, the ends of said arms having opposite openings (7, 7') in which the vane (2) pivots.
  2. Thermal-magnetic tripping mechanism according to the preceding claim, characterised in that the return means are formed by a compression spring interposed between the vane (2), via a tab (11) passing beyond the free end of the latter opposite the hinge with the intermediate piece (6), and a hook (13) extending said piece past the cylinder head, a second tab (10) passing beyond the latter.
  3. Thermal-magnetic tripping mechanism according to the preceding claim, characterised in that two stops (8, 8') are arranged close to the pivot axis with the aim of limiting the switching amplitude of the vane (2) under the effect of the compression spring (9), which is applied permanently on said vane (2) in the direction of said stops (8, 8').
  4. Thermal-magnetic tripping mechanism according to any of the preceding claims, characterised in that the mobile vane (2) has at least two layers (2', 2") obtained by folding the magnetic sheet forming said vane (2).
  5. Thermal-magnetic tripping mechanism according to any of the preceding claims, characterised in that the vane (2) has a flap (12) for controlling its switching amplitude, the free end of which cooperates with the housing of the electric device.
  6. Thermal-magnetic tripping mechanism according to the preceding claim, characterised in that said flap (12) is formed by a portion of the metal sheet of the vane (2) adjacent to an edge perpendicular to the pivoting axis, obtained by cutting out a segment parallel to said edge and being folded, the angle of the latter being variable and forms the parameter for controlling the switching amplitude of the vane (2).
  7. Thermal-magnetic tripping mechanism according to any of claims 1 to 5, characterised in that the bimetal switch (3) passes into the trough forming the cylinder head (1), in which it is oriented to be substantially parallel to the axis of said trough.
  8. Thermal-magnetic tripping mechanism according to the preceding claim, characterised in that the bimetal switch (3) is connected electrically to the terminal (4) at the output of the cylinder head by at least one flexible conductive braid (5) welded on the one hand to the free end of the bimetal switch (3) and on the other hand to the back of said terminal (4).
  9. Thermal-magnetic tripping mechanism according to any of claims 6 and 7, characterised in that the bimetal switch (3) is fixed to the sole of the housing of the device at its end opposite the free end and connected at this level to a mobile contact of the cut-off device via at least one flexible conductive braid.
  10. Electrical cut-off device of the circuit-breaker type comprising for each line to be protected a mobile contact which is able to cooperate with a fixed contact, a mechanical disconnection lock which can switch to separate the contact mobile of the fixed contact in case of overcurrent in a line, characterised in that it comprises a thermal-magnetic tripping mechanism according to any of the preceding claims able to act on said lock to make it switch.
EP10715967.5A 2009-03-23 2010-03-23 Thermal-magnetic tripping mechanism Active EP2411995B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0951817A FR2943455B1 (en) 2009-03-23 2009-03-23 MAGNETOTHERMIC TRIGGER
PCT/FR2010/050525 WO2010109129A1 (en) 2009-03-23 2010-03-23 Magnetothermal release mechanism

Publications (2)

Publication Number Publication Date
EP2411995A1 EP2411995A1 (en) 2012-02-01
EP2411995B1 true EP2411995B1 (en) 2018-01-17

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Application Number Title Priority Date Filing Date
EP10715967.5A Active EP2411995B1 (en) 2009-03-23 2010-03-23 Thermal-magnetic tripping mechanism

Country Status (6)

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EP (1) EP2411995B1 (en)
JP (2) JP5632449B2 (en)
CN (1) CN102439681B (en)
BR (1) BRPI1006271A2 (en)
FR (1) FR2943455B1 (en)
WO (1) WO2010109129A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2987164B1 (en) * 2012-02-17 2014-03-28 Hager Electro Sas INSTANTANEOUS TRIGGER FOR ELECTRICAL DEVICE FOR PROTECTING LINES OF THE CIRCUIT BREAKER TYPE.
EP2750158B1 (en) * 2012-12-27 2015-08-26 Hager Electro Sas Thermal, magnetic subassembly for a selective circuit-breaker
FR3023057B1 (en) * 2014-06-30 2016-07-22 Hager-Electro Sas MAGNETOTHERMIC TRIGGER.
EP3373319B1 (en) * 2017-03-09 2021-11-10 LSIS Co., Ltd. Circuit breaker with instant trip mechanism

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60127629A (en) * 1983-12-14 1985-07-08 松下電工株式会社 Circuit breaker
JPH05342967A (en) * 1992-06-04 1993-12-24 Mitsubishi Electric Corp Circuit breaker
JPH0896689A (en) * 1994-09-28 1996-04-12 Mitsubishi Electric Corp Trip device of circuit breaker
DE29515254U1 (en) * 1995-09-23 1995-12-14 Kloeckner Moeller Gmbh Tripping device consisting of an electromagnetic quick release and a bimetal strip of an overcurrent release that is operatively connected to it
JP2001068007A (en) * 1999-08-26 2001-03-16 Matsushita Electric Works Ltd Electromagnetic tripping device of circuit breaker
DE10036351B4 (en) * 2000-07-26 2007-01-11 Moeller Gmbh Tripping device for overload and short-circuit tripping
JP3640169B2 (en) * 2001-01-26 2005-04-20 松下電工株式会社 Circuit breaker trip device
DE102006005697A1 (en) * 2006-02-08 2007-08-16 Moeller Gmbh Device for triggering an electrical switching device
JP4905112B2 (en) * 2006-12-18 2012-03-28 富士電機機器制御株式会社 Circuit breaker overcurrent trip device
CN201204164Y (en) * 2008-05-31 2009-03-04 常熟开关制造有限公司(原常熟开关厂） Pyromagnetic release

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Publication number Publication date
JP5632449B2 (en) 2014-11-26
BRPI1006271A2 (en) 2016-02-23
WO2010109129A1 (en) 2010-09-30
JP2014225473A (en) 2014-12-04
CN102439681A (en) 2012-05-02
EP2411995A1 (en) 2012-02-01
CN102439681B (en) 2015-12-09
FR2943455A1 (en) 2010-09-24
JP2012521626A (en) 2012-09-13
FR2943455B1 (en) 2011-05-06

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