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EP2237302B1 - Thermal trip device for electrical protection device - Google Patents

Thermal trip device for electrical protection device Download PDF

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Publication number
EP2237302B1
EP2237302B1 EP10354004A EP10354004A EP2237302B1 EP 2237302 B1 EP2237302 B1 EP 2237302B1 EP 10354004 A EP10354004 A EP 10354004A EP 10354004 A EP10354004 A EP 10354004A EP 2237302 B1 EP2237302 B1 EP 2237302B1
Authority
EP
European Patent Office
Prior art keywords
slide
ramp
bimetal strip
trip device
rack
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.)
Active
Application number
EP10354004A
Other languages
German (de)
French (fr)
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EP2237302A1 (en
Inventor
Thomas Tilmant
Sébastien SCHMITT
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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Filing date
Publication date
Application filed by Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP2237302A1 publication Critical patent/EP2237302A1/en
Application granted granted Critical
Publication of EP2237302B1 publication Critical patent/EP2237302B1/en
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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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element

Definitions

  • the present invention relates to a thermal tripping device for an electrical protection device, said apparatus comprising a trigger lever articulated on a plate and being controlled by said tripping device to cause in the event of a fault the breakage of a mechanical connection causing the automatic tripping of a control mechanism of the circuit breaker, this tripping causing the opening of two respectively fixed and movable contacts, said thermal tripping device comprising a bimetallic adapted to cooperate with a drawer connected in an articulated manner by one of its ends at said lever so as to drive said spool in the direction of release during deformation of the bimetal strip due to an electric overload, said spool cooperating with an abutment fixed with respect to the housing of the apparatus and intended to partly guide the trajectory drawer when moving.
  • the tensile force exerted by the end of the thermal bimetallic strip on the drawer is oriented in a direction which is normal to the point of support of the bimetallic strip on the drawer. This direction changes when bimetallic bends under the thermal effect of an electric overload. It is then necessary that the change in the direction of the force remains below a maximum angle in order to return the drawer against its stop.
  • the trigger stroke of the drawer is not repetitive as is the trip time for a given current.
  • the document EP 0 962 952 describes a device according to the preamble of claim 1.
  • the present invention solves these problems and proposes a thermal tripping device for an electrical protection apparatus in which the tripping times are repetitive even in case of significant bimetallic deflection in order to improve the performance of the apparatus.
  • the subject of the present invention is a thermal tripping device for an electrical protection device, said device being characterized in that said bimetal strip comprises, at its end cooperating with the drawer, a ramp portion, said ramp being arranged so as to position the slide against the aforementioned abutment during the first phase of deformation of the bimetal, so that said stop then guiding said drawer during its movement.
  • the plane of the ramp portion forms with the longitudinal direction of the bimetal an angle ⁇ of about 10 °.
  • the aforementioned ramp portion is made by folding the end of the bimetal.
  • the aforesaid ramp portion is made by shearing a portion of the end of the bimetal then folding this portion to form a ramp.
  • said ramp is made via an insert attached to the end of the bimetallic strip.
  • the apparatus comprising an upper part comprising the control mechanism and a lower part comprising means for fixing the apparatus to a support surface, said ramp is made by folding down the apparatus of the end of the bimetallic strip, said end being directed towards the top of the apparatus, on the side of the bimetall opposite the drawer.
  • the apparatus comprising an upper part comprising the control mechanism and a lower part comprising means for fixing the the apparatus to a support surface, said ramp is made by folding down the end of the bimetal, the latter then being oriented towards the bottom of the apparatus and extending on the same side of the bimetallic strip as the drawer .
  • the invention also relates to an electrical protection device comprising a thermal tripping device comprising the previously mentioned features taken alone or in combination.
  • a miniature electric circuit breaker molded insulating housing D comprising, in a manner known per se, a pair of contacts 1.2 fixed and mobile, said movable contact 2 being carried by a contact arm actuated by a control mechanism M.
  • This control mechanism M comprises a joystick 3 for manual operation of the contacts coupled to a transmission link 4 to form a toggle joint, a support lever 5 of the contact arm articulated on the pivot of a rotary plate 6, an arranged breakable mechanical link between the plate 6 and the transmission rod 4, and a trigger bar 7 hinged to the plate 6 and controlled by an electromagnetic tripping device 8 and a thermal tripping device 9 to cause, in case of failure, the rupture the mechanical link, causing the trigger mechanism independently of the handle 3.
  • this thermal tripping device 9 comprises a bimetallic strip 10 traversed by the current, said bimetal being fixed by a 10a of its ends to the housing B, and cooperating at its opposite end 10b, with a slide 11 mechanically connected to the trigger bar 7.
  • the spool 11 is of bent shape and has an end 11a hingedly connected to the trigger bar 7 and a portion extending perpendicularly to the plane of the spool (not visible in this figure) and on which the bimetal 10 comes s' press to exert traction on said drawer 11.
  • This drawer is intended to be positioned on a stop 12 in the first phase of deformation of the bimetallic strip.
  • the end 10b of the bimetal intended to cooperate with the slide 11 comprises a ramp 13 formed by folding down said end, which extends towards the top of the apparatus in the direction of the control mechanism M.
  • said end of said bimetal has been sheared and a portion 14 of said end portion has been bent to form a ramp 15 extending downwardly from the apparatus, i.e. apparatus for attachment by fastening means F to a support surface, said ramp extending between the drawer and the main portion of the bimetal.
  • this ramp is formed by means of an insert 16 forming a ramp attached to the end of said bimetallic strip.
  • the angle formed between this ramp end portion 13 and the longitudinal direction D of the bimetal is about 10 °.
  • the thermal tripping device is a device according to the prior art.
  • the force F1 exerted on the slide 11 at the beginning of deflection of the bimetallic strip 10 moves the slide 11 away from its abutment 12. This is due to the fact that, in view of the large deflection of said bimetal strip, this bimetal 'more its function of positioning the drawer against the stop.
  • a ramp 13 has been formed at the end of the bimetal strip according to the embodiment illustrated in the drawings. figures 2 and 3 .
  • the force F2 exerted by the bimetal at the beginning of its deflection causes the slide 11 to the abutment 12.
  • an electrical protection device has been realized in which the drawer is biased towards its stop from the beginning of the deflection of the bimetallic strip.
  • the drawer is correctly positioned, before the bimetallic begins to move in the direction of tripping.
  • the positioning of the slide on its stop allows said stop to partially guide the slide during its movement.
  • the trajectory and the trigger stroke of the drawer are therefore repetitive as well as the tripping times for a given current, hence improving the performance of the device.
  • This improvement has the advantage of representing a low industrial cost, will not occupy the place of another component of the circuit breaker, and will not induce a profound change in the kinematic chain of the circuit breaker.
  • the invention applies to any protective equipment using a bimetallic strip, for example a motor protection circuit breaker, a motor contactor, etc.

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  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

The device (9) has a triggering lever articulated on a plate. A bimetallic strip (10) cooperates with a slide (11). The slide is connected with the lever to drive the slide in a triggering direction during deformation of the bimetallic strip due to electrical overload. The bimetallic strip has a ramp (13) at its end cooperating with the slide. The ramp is arranged in a manner to position the slide against a stop (12) during a deformation phase of the bimetallic strip such that the stop assures guiding of the slide during its displacement.

Description

La présente invention concerne un dispositif de déclenchement thermique pour un appareil de protection électrique, ledit appareil comportant un levier de déclenchement articulé sur une platine et étant piloté par ledit dispositif de déclenchement pour provoquer en cas de défaut la rupture d'une liaison mécanique entraînant le déclenchement automatique d'un mécanisme de commande du disjoncteur, ce déclenchement entraînant l'ouverture de deux contacts respectivement fixe et mobile, ledit dispositif de déclenchement thermique comportant un bilame apte à coopérer avec un tiroir relié de manière articulée par l'une de ses extrémités, audit levier de manière à entraîner ledit tiroir dans le sens du déclenchement lors d'une déformation du bilame suite à une surcharge électrique, ledit tiroir coopérant avec une butée fixe par rapport au boîtier de l'appareil et destinée à guider en partie la trajectoire du tiroir lors de son déplacement.The present invention relates to a thermal tripping device for an electrical protection device, said apparatus comprising a trigger lever articulated on a plate and being controlled by said tripping device to cause in the event of a fault the breakage of a mechanical connection causing the automatic tripping of a control mechanism of the circuit breaker, this tripping causing the opening of two respectively fixed and movable contacts, said thermal tripping device comprising a bimetallic adapted to cooperate with a drawer connected in an articulated manner by one of its ends at said lever so as to drive said spool in the direction of release during deformation of the bimetal strip due to an electric overload, said spool cooperating with an abutment fixed with respect to the housing of the apparatus and intended to partly guide the trajectory drawer when moving.

La force de traction exercée par l'extrémité du bilame thermique sur le tiroir, est orientée dans une direction qui est normale au point d'appui du bilame sur le tiroir. Cette direction change quand le bilame se courbe sous l'effet thermique d'une surcharge électrique. Il est alors nécessaire que le changement de la direction de la force reste en dessous d'un angle maximum afin de rappeler le tiroir contre sa butée.The tensile force exerted by the end of the thermal bimetallic strip on the drawer is oriented in a direction which is normal to the point of support of the bimetallic strip on the drawer. This direction changes when bimetallic bends under the thermal effect of an electric overload. It is then necessary that the change in the direction of the force remains below a maximum angle in order to return the drawer against its stop.

Or, pour améliorer les performances de l'appareil, il peut être souhaitable d'utiliser un bilame dont la déflexion est trop importante pour permettre de maintenir la direction de la force dans la plage de variation permise.However, to improve the performance of the device, it may be desirable to use a bimetal whose deflection is too great to maintain the direction of the force in the range of variation allowed.

Cette déformation importante du bilame produit à son extrémité coopérant avec le tiroir, une pente plus importante qui s'oppose au déplacement du tiroir en direction d'une butée, ladite butée étant destinée à assurer partiellement le guidage dudit tiroir pendant son déplacement conduisant au déclenchement du mécanisme.This significant deformation of the bimetal produced at its end cooperating with the slide, a larger slope which opposes the displacement of the slide towards a stop, said stop being intended to partially ensure the guiding of said slide during its displacement leading to the triggering of the mechanism.

Il en résulte que la course de déclenchement du tiroir n'est pas répétitive de même que le temps de déclenchement pour un courant donné.As a result, the trigger stroke of the drawer is not repetitive as is the trip time for a given current.

Le document EP 0 962 952 décrit un dispositif selon le préambule de la revendication 1.The document EP 0 962 952 describes a device according to the preamble of claim 1.

La présente invention résout ces problèmes et propose un dispositif de déclenchement thermique pour un appareil de protection électrique dans lequel les temps de déclenchement sont répétitifs même en cas de déflexion importante du bilame afin d'améliorer les performances de l'appareil.The present invention solves these problems and proposes a thermal tripping device for an electrical protection apparatus in which the tripping times are repetitive even in case of significant bimetallic deflection in order to improve the performance of the apparatus.

A cet effet, la présente invention a pour objet un dispositif de déclenchement thermique pour un appareil de protection électrique, ledit dispositif étant caractérisé en ce que ledit bilame comporte, à son extrémité coopérant avec le tiroir, une partie formant rampe, ladite rampe étant agencée de manière à positionner le tiroir contre la butée précitée pendant la première phase de déformation du bilame, de manière que ladite butée assure ensuite le guidage du dit tiroir pendant son déplacement.For this purpose, the subject of the present invention is a thermal tripping device for an electrical protection device, said device being characterized in that said bimetal strip comprises, at its end cooperating with the drawer, a ramp portion, said ramp being arranged so as to position the slide against the aforementioned abutment during the first phase of deformation of the bimetal, so that said stop then guiding said drawer during its movement.

Selon une caractéristique particulière, le plan de la partie formant rampe forme avec la direction longitudinale du bilame un angle α d'environ 10°.According to a particular characteristic, the plane of the ramp portion forms with the longitudinal direction of the bimetal an angle α of about 10 °.

Selon une autre caractéristique, la partie formant rampe précitée est réalisée par pliage de l'extrémité du bilame.According to another feature, the aforementioned ramp portion is made by folding the end of the bimetal.

Selon une autre réalisation, la partie formant rampe précitée est réalisée par cisaillage d'une partie de l'extrémité du bilame puis pliage de cette partie de manière à former une rampe.According to another embodiment, the aforesaid ramp portion is made by shearing a portion of the end of the bimetal then folding this portion to form a ramp.

Selon une autre réalisation, ladite rampe est réalisée par l'intermédiaire d'une pièce rapportée fixée à l'extrémité du bilame.According to another embodiment, said ramp is made via an insert attached to the end of the bimetallic strip.

Selon une réalisation particulière, l'appareil comportant une partie haute comportant le mécanisme de commande et une partie basse comportant des moyens de fixation de l'appareil à une surface de support, ladite rampe est réalisée par pliage vers le bas de l'appareil de l'extrémité du bilame, ladite extrémité étant orientée vers le haut de l'appareil, du côté du bilame opposé au tiroir.According to a particular embodiment, the apparatus comprising an upper part comprising the control mechanism and a lower part comprising means for fixing the apparatus to a support surface, said ramp is made by folding down the apparatus of the end of the bimetallic strip, said end being directed towards the top of the apparatus, on the side of the bimetall opposite the drawer.

Selon une autre réalisation, l'appareil comportant une partie haute comportant le mécanisme de commande et une partie basse comportant des moyens de fixation de l'appareil à une surface de support, ladite rampe est réalisée par pliage vers le bas de l'extrémité du bilame, celle-ci étant alors orientée vers le bas de l'appareil et s'étendant du même coté du bilame que le tiroir.According to another embodiment, the apparatus comprising an upper part comprising the control mechanism and a lower part comprising means for fixing the the apparatus to a support surface, said ramp is made by folding down the end of the bimetal, the latter then being oriented towards the bottom of the apparatus and extending on the same side of the bimetallic strip as the drawer .

L'invention a également pour objet un appareil de protection électrique comportant un dispositif de déclenchement thermique comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.The invention also relates to an electrical protection device comprising a thermal tripping device comprising the previously mentioned features taken alone or in combination.

Mais d'autres avantages et caractéristiques de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemple et dans lesquels :

  • La figure 1 est une vue en plan d'un disjoncteur dont on a retiré le boîtier, équipé d'un dispositif de déclenchement thermique selon une réalisation particulière de l'invention,
  • La figure 2 est une vue identique à la précédente, le disjoncteur étant équipé d'un dispositif de déclenchement thermique selon une seconde réalisation de l'invention,
  • La figure 3 est une vue en plan d'un disjoncteur sans couvercle, ledit disjoncteur étant équipé du même dispositif de déclenchement que dans la figure précédente,
  • La figure 4 est une vue en plan d'un disjoncteur sans boîtier, équipé d'un dispositif de déclenchement selon une troisième réalisation,
  • La figure 5 est une vue partielle, illustrant une barre de déclenchement, un tiroir et un dispositif de déclenchement selon l'art antérieur, et
  • La figure 6 est une vue identique à la précédente avec un dispositif de déclenchement thermique selon l'invention,
But other advantages and features of the invention will become more apparent in the detailed description which follows and refers to the accompanying drawings given solely by way of example and in which:
  • The figure 1 is a plan view of a circuit breaker whose case has been removed, equipped with a thermal tripping device according to a particular embodiment of the invention,
  • The figure 2 is a view identical to the previous one, the circuit breaker being equipped with a thermal tripping device according to a second embodiment of the invention,
  • The figure 3 is a plan view of a circuit breaker without a cover, said circuit breaker being equipped with the same tripping device as in the previous figure,
  • The figure 4 is a plan view of a circuit breaker without a box, equipped with a tripping device according to a third embodiment,
  • The figure 5 is a partial view, illustrating a trigger bar, a drawer and a tripping device according to the prior art, and
  • The figure 6 is a view identical to the previous one with a thermal release device according to the invention,

Sur les figures 1 à 4 est représenté un disjoncteur électrique miniature à boîtier isolant moulé D comprenant de manière connue en soi, une paire de contacts 1,2 fixe et mobile, ledit contact mobile 2 étant porté par un bras de contact actionné par un mécanisme M de commande.On the Figures 1 to 4 is shown a miniature electric circuit breaker molded insulating housing D comprising, in a manner known per se, a pair of contacts 1.2 fixed and mobile, said movable contact 2 being carried by a contact arm actuated by a control mechanism M.

Ce mécanisme de commande M comporte une manette 3 de manoeuvre manuelle des contacts accouplée à une biellette de transmission 4 pour former une genouillère, un levier 5 support du bras de contact articulé sur le pivot d'une platine rotative 6, une liaison mécanique brisable agencée entre la platine 6 et la biellette de transmission 4, et une barre de déclenchement 7 articulée sur la platine 6 et commandée par un dispositif de déclenchement electro-magnétique 8 et un dispositif de déclenchement thermique 9 pour provoquer, en cas de défaut, la rupture de la liaison mécanique, entraînant le déclenchement du mécanisme indépendamment de la manette 3. De manière également connue en soi, ce dispositif de déclenchement thermique 9 comporte un bilame 10 traversé par le courant, ledit bilame étant fixé par l'une 10a de ses extrémités au boîtier B, et coopérant par son extrémité opposée 10b, avec un tiroir 11 relié mécaniquement à la barre de déclenchement 7. Comme ceci est particulièrement visible sur les figures 5 et 6, le tiroir 11 est de forme coudée et comporte une extrémité 11a reliée de manière articulée à la barre de déclenchement 7 et une partie s'étendant perpendiculairement au plan du tiroir (non visible sur cette figure) et sur laquelle le bilame 10 vient s'appuyer pour exercer une traction sur ledit tiroir 11. Ce tiroir est destiné à venir se positionner sur une butée 12 dans la première phase de déformation du bilame.This control mechanism M comprises a joystick 3 for manual operation of the contacts coupled to a transmission link 4 to form a toggle joint, a support lever 5 of the contact arm articulated on the pivot of a rotary plate 6, an arranged breakable mechanical link between the plate 6 and the transmission rod 4, and a trigger bar 7 hinged to the plate 6 and controlled by an electromagnetic tripping device 8 and a thermal tripping device 9 to cause, in case of failure, the rupture the mechanical link, causing the trigger mechanism independently of the handle 3. In a manner also known per se, this thermal tripping device 9 comprises a bimetallic strip 10 traversed by the current, said bimetal being fixed by a 10a of its ends to the housing B, and cooperating at its opposite end 10b, with a slide 11 mechanically connected to the trigger bar 7. As this is particularly visible on Figures 5 and 6 , the spool 11 is of bent shape and has an end 11a hingedly connected to the trigger bar 7 and a portion extending perpendicularly to the plane of the spool (not visible in this figure) and on which the bimetal 10 comes s' press to exert traction on said drawer 11. This drawer is intended to be positioned on a stop 12 in the first phase of deformation of the bimetallic strip.

Selon la réalisation de l'invention illustrée sur la figure 1, l'extrémité 10b du bilame destinée à coopérer avec le tiroir 11, comporte une rampe 13 formée par pliage vers le bas de ladite extrémité, laquelle s'étend vers le haut de l'appareil en direction du mécanisme de commande M.According to the embodiment of the invention illustrated on the figure 1 , the end 10b of the bimetal intended to cooperate with the slide 11, comprises a ramp 13 formed by folding down said end, which extends towards the top of the apparatus in the direction of the control mechanism M.

Selon la réalisation illustrée sur les figures 2 et 3, ladite extrémité dudit bilame a été cisaillée et une partie 14 de cette partie d'extrémité a été pliée de manière à former une rampe 15 s'étendant vers le bas de l'appareil, c'est-à-dire du côté de l'appareil destiné à être fixé par des moyens de fixation F sur une surface de support, ladite rampe s'étendant entre le tiroir et la partie principale du bilame.According to the illustrated realization on the figures 2 and 3 said end of said bimetal has been sheared and a portion 14 of said end portion has been bent to form a ramp 15 extending downwardly from the apparatus, i.e. apparatus for attachment by fastening means F to a support surface, said ramp extending between the drawer and the main portion of the bimetal.

Sur la figure 4, cette rampe est formée par l'intermédiaire d'une pièce rapportée 16 formant rampe fixée à l'extrémité dudit bilame. Dans toutes ces réalisations, l'angle a formé entre cette partie d'extrémité formant rampe 13 et la direction longitudinale D de la bilame est d'environ 10°.On the figure 4 this ramp is formed by means of an insert 16 forming a ramp attached to the end of said bimetallic strip. In all these embodiments, the angle formed between this ramp end portion 13 and the longitudinal direction D of the bimetal is about 10 °.

Le fonctionnement du dispositif selon l'invention va être décrit dans ce qui suit en référence aux figures.The operation of the device according to the invention will be described in the following with reference to the figures.

Sur la figure 5, le dispositif de déclenchement thermique est un dispositif selon l'art antérieur. Sur cette figure, on voit que la force F1 exercée sur le tiroir 11 en début de déflexion du bilame 10 éloigne le tiroir 11 de sa butée 12. Ceci est du au fait que compte tenu de la déflexion importante dudit bilame, celle-ci n'exerce plus sa fonction de positionnement du tiroir contre la butée.On the figure 5 , the thermal tripping device is a device according to the prior art. In this figure, it can be seen that the force F1 exerted on the slide 11 at the beginning of deflection of the bimetallic strip 10 moves the slide 11 away from its abutment 12. This is due to the fact that, in view of the large deflection of said bimetal strip, this bimetal 'more its function of positioning the drawer against the stop.

Sur la figure 6 au contraire, une rampe 13 a été formée à l'extrémité du bilame selon la réalisation illustrée sur les figures 2 et 3. Grâce à cette rampe, la force F2 exercée par le bilame au début de sa déflexion, entraine le tiroir 11 vers la butée précitée 12.On the figure 6 on the contrary, a ramp 13 has been formed at the end of the bimetal strip according to the embodiment illustrated in the drawings. figures 2 and 3 . With this ramp, the force F2 exerted by the bimetal at the beginning of its deflection, causes the slide 11 to the abutment 12.

On a donc réalisé grâce à l'invention un appareil de protection électrique dans lequel le tiroir est rappelé vers sa butée dés le début de la déflexion du bilame. Ainsi, le tiroir est correctement positionné, avant que le bilame ne commence son déplacement dans le sens du déclenchement. Ainsi, le positionnement du tiroir sur sa butée permet à ladite butée de guider en partie le tiroir lors de son déplacement. La trajectoire et la course de déclenchement du tiroir sont donc répétitives ainsi que les temps de déclenchement pour un courant donné, d'où une amélioration des performances de l'appareil. Cette amélioration présente l'avantage de représenter un coût industriel faible, n'occupera pas la place d'un autre composant du disjoncteur, et n'induira pas de modification profonde de la chaîne cinématique du disjoncteur.Therefore, thanks to the invention, an electrical protection device has been realized in which the drawer is biased towards its stop from the beginning of the deflection of the bimetallic strip. Thus, the drawer is correctly positioned, before the bimetallic begins to move in the direction of tripping. Thus, the positioning of the slide on its stop allows said stop to partially guide the slide during its movement. The trajectory and the trigger stroke of the drawer are therefore repetitive as well as the tripping times for a given current, hence improving the performance of the device. This improvement has the advantage of representing a low industrial cost, will not occupy the place of another component of the circuit breaker, and will not induce a profound change in the kinematic chain of the circuit breaker.

L'invention s'applique à tout appareillage de protection utilisant un bilame thermique, par exemple un disjoncteur de protection moteur, un contacteur moteur, etc....The invention applies to any protective equipment using a bimetallic strip, for example a motor protection circuit breaker, a motor contactor, etc.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et illustrés qui n'ont été donnés qu'à titre d'exemple.Of course, the invention is not limited to the embodiments described and illustrated which have been given by way of example.

C'est ainsi que d'autres moyens pourraient être envisagés pour créer une rampe.This is how other ways could be considered to create a ramp.

Claims (8)

  1. A thermal trip device for an electrical protection apparatus, said device comprising a trip lever articulated on a mounting plate and being controlled by said trip device to bring about breaking of a mechanical link, in the event of a fault occurring, resulting in automatic tripping of an operating mechanism of the circuit breaker, this tripping resulting in opening of two contacts, respectively stationary and movable, said thermal trip device comprising a bimetal strip designed to operate in conjunction with a slide-rack connected in articulated manner via one of the ends thereof to said lever so as to drive said slide-rack in the tripping direction when deformation of the bimetal strip occurs following an electric overload, characterized in that said slide-rack operates in conjunction with a stop that is fixed with respect to the case of the apparatus and is designed to partially guide the trajectory of the slide-rack during movement of the latter, and in that said bimetal strip (10) comprises a part forming a ramp (13), at the end (10b) thereof operating in conjunction with the slide-rack (11), said ramp being arranged in such a way as to position the slide-rack (11) against the above-mentioned stop (12) during the first phase of deformation of the bimetal strip so that said stop then performs guiding of said slide-rack during movement of the latter.
  2. The trip device according to claim 1, characterized in that the plane of the part forming a ramp (13) forms an angle α of about 10° with the longitudinal direction D of the bimetal strip (10).
  3. The trip device according to claim 1 or 2, characterized in that the above-mentioned part forming a ramp (13) is achieved by folding the end of the bimetal strip (10).
  4. The trip device according to claim 1 or 2, characterized in that the above-mentioned part forming a ramp (13) is achieved by shearing a part of the end of the bimetal strip (10) and then folding this part (14) so as to form a ramp.
  5. The trip device according to claim 1 or 2, characterized in that said ramp (13) is achieved by means of an added part (16) fixed to the end of the bimetal strip.
  6. The trip device according to claim 3, characterized in that the apparatus comprising a top part comprising the operating mechanism and a bottom part comprising means for fixing the apparatus to a support surface, said ramp (13) is achieved by folding the end of the bimetal strip towards the bottom of the apparatus, said end being directed towards the top of the apparatus, on the side of the bimetal strip opposite the slide-rack.
  7. The trip device according to claim 3, characterized in that the apparatus comprising a top part comprising the operating mechanism M and a bottom part comprising fixing means F of the apparatus to a support surface, said ramp is achieved by folding the end of the bimetal strip downwards, the latter then being directed towards the bottom of the apparatus and extending on the same side of the bimetal strip as the slide-rack.
  8. An electrical protection apparatus comprising a thermal trip device according to any one of the foregoing claims.
EP10354004A 2009-03-31 2010-01-18 Thermal trip device for electrical protection device Active EP2237302B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0901580A FR2943847B1 (en) 2009-03-31 2009-03-31 THERMAL RELEASE DEVICE FOR AN ELECTRICAL PROTECTION DEVICE

Publications (2)

Publication Number Publication Date
EP2237302A1 EP2237302A1 (en) 2010-10-06
EP2237302B1 true EP2237302B1 (en) 2011-12-07

Family

ID=41275153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10354004A Active EP2237302B1 (en) 2009-03-31 2010-01-18 Thermal trip device for electrical protection device

Country Status (6)

Country Link
EP (1) EP2237302B1 (en)
CN (1) CN101853749B (en)
AT (1) ATE536625T1 (en)
BR (1) BRPI1000820B1 (en)
ES (1) ES2374876T3 (en)
FR (1) FR2943847B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105869960B (en) * 2016-06-02 2018-11-23 无锡新宏泰电器科技股份有限公司 A kind of Thermomagnetic type breaker of plastic casing overload signal output device
CN108288572B (en) * 2017-12-28 2024-10-29 温州市新蓝天电器有限公司 Circuit breaker of integrated latch tripping mechanism

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2455355A1 (en) * 1979-04-25 1980-11-21 Saparel IMPROVEMENTS ON MODULAR CIRCUIT BREAKERS
FR2779568B1 (en) * 1998-06-04 2000-07-13 Schneider Electric Ind Sa ELECTRICAL CUT-OFF DEVICE INCLUDING A DIFFERENTIAL TRIP DEVICE AND CIRCUIT BREAKER INCLUDING SUCH A DEVICE
CN2517101Y (en) * 2001-12-31 2002-10-16 施贻挺 Small-sized circuit breaker operating device
CN2938385Y (en) * 2006-08-17 2007-08-22 浙江省志明电气进出口有限公司 Leakage circuit breaker

Also Published As

Publication number Publication date
CN101853749B (en) 2014-04-16
BRPI1000820B1 (en) 2020-08-18
CN101853749A (en) 2010-10-06
ATE536625T1 (en) 2011-12-15
FR2943847A1 (en) 2010-10-01
FR2943847B1 (en) 2011-04-01
ES2374876T3 (en) 2012-02-22
BRPI1000820A2 (en) 2011-03-22
EP2237302A1 (en) 2010-10-06

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