EP0560696A1 - Contact for moulded case circuit breaker - Google Patents

Contact for moulded case circuit breaker Download PDF

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Publication number
EP0560696A1
EP0560696A1 EP93420099A EP93420099A EP0560696A1 EP 0560696 A1 EP0560696 A1 EP 0560696A1 EP 93420099 A EP93420099 A EP 93420099A EP 93420099 A EP93420099 A EP 93420099A EP 0560696 A1 EP0560696 A1 EP 0560696A1
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EP
European Patent Office
Prior art keywords
contact
contact bridge
anvil
circuit breaker
strand
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
EP93420099A
Other languages
German (de)
French (fr)
Other versions
EP0560696B1 (en
Inventor
Denis Vial
Jean Bonfils
Marc Rival
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 SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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Publication date
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Application filed by Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0560696A1 publication Critical patent/EP0560696A1/en
Application granted granted Critical
Publication of EP0560696B1 publication Critical patent/EP0560696B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position

Definitions

  • the favorable action of the anvil can be explained by the absence of rebounding of the contacts during closing and therefore of a shock between the contacts which is more effective in crushing the contact surfaces.
  • the mass of the moving element is large enough to strike the moving contact strongly against the fixed contact and thus ensure a crushing of the contact surface and a low contact resistance.
  • the same result is obtained according to the present invention for a low mass contact bridge by attaching an anvil to the fixed contact.

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  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

A mobile contact bridge (13) of a moulded case limiter circuit breaker is carried by a bar (20) by a system of springs (22, 23) allowing opening with electrodynamic repulsion. The contact bridge (13) interacts with fixed contacts (28, 29) solidly attached to current supply conductors (25, 26) in the form of a half loop. A core (anvil) (33) is fastened to the rear of the fixed contacts in order to increase the closure shock effect of the contact bridge (13) and prevent scatter in the contact resistance. The core (anvil) (33) is made of a ferromagnetic material which increases the arc extinction magnetic field towards the cutout chambers. …<IMAGE>…

Description

L'invention est relative à un disjoncteur limiteur basse tension à boîtier moulé comprenant un pont de contacts rotatif, une paire de contacts fixes coopérant avec ledit pont de contacts, un conducteur d'amenée de courant à chacun desdits contacts fixes s'étendant dans le plan de débattement dudit pont de contacts et conformé pour constituer avec le pont de contacts une trajectoire en boucle engendrant des forces électrodynamiques de répulsion, un barreau ayant une ouverture transversale dans laquelle est disposée la partie centrale du pont de contacts avec une liberté de rotation en direction d'ouverture sous l'action desdites forces électrodynamiques à l'encontre d'une force élastique assurant la pression de contact, le conducteur d'amenée de courant étant agencé en demi-boucle avant un premier et un deuxième brins parallèles espacés, le premier brin portant une pièce de contact fixe.The invention relates to a low-voltage limiting circuit breaker with molded housing comprising a rotary contact bridge, a pair of fixed contacts cooperating with said contact bridge, a current supply conductor to each of said fixed contacts extending in the deflection plane of said contact bridge and shaped to constitute with the contact bridge a loop path generating electrodynamic forces of repulsion, a bar having a transverse opening in which is disposed the central part of the contact bridge with freedom of rotation in direction of opening under the action of said electrodynamic forces against an elastic force ensuring contact pressure, the current supply conductor being arranged in a half-loop before first and second spaced parallel strands, the first strand carrying a fixed contact piece.

L'effet de limitation du courant par un disjoncteur du genre mentionné dépend de la rapidité d'ouverture des contacts, indépendamment du mécanisme de commande, cette rapidité d'ouverture étant elle-même fonction de l'intensité des forces électrodynamiques de répulsion et de la masse de l'équipage mobile, en l'occurrence du pont de contacts. La faible masse du pont de contacts mobile présente un effet défavorable à la fermeture du disjoncteur. La résistance de contact, et de ce fait l'échauffement, est supérieure et surtout la dispersion des résistances de contact est nettement plus grande. Le bon fonctionnement du disjoncteur peut être affecté par ces phénomènes de dispersion et de résistance accrues et la présente invention a pour but de permettre la réalisation d'un dispositif de contact amélioré.The effect of limiting the current by a circuit breaker of the type mentioned depends on the speed of opening of the contacts, independently of the control mechanism, this speed of opening being itself a function of the intensity of the electrodynamic forces of repulsion and the mass of the moving part, in this case the contact bridge. The low mass of the mobile contact bridge has an unfavorable effect when the circuit breaker is closed. The contact resistance, and therefore the heating, is higher and above all the dispersion of the contact resistances is much greater. The proper functioning of the circuit breaker can be affected by these phenomena of increased dispersion and resistance and the present invention aims to allow the production of an improved contact device.

Selon le document EP-A-28740, un circuit magnétique présente une partie transversale ayant une faible épaisseur par rapport à l'entrefer séparant la partie centrale du brin inférieur du conducteur d'amenée de courant. Cette partie du courant magnétique présente une certaine flexibilité susceptible de produire des rebondissements du contact mobile sur le contact fixe, lorsque la masse du contact mobile est faible.According to document EP-A-28740, a magnetic circuit has a transverse part having a small thickness compared to the air gap separating the central part of the lower strand of the current supply conductor. This part of the magnetic current has a certain flexibility capable of producing twists of the movable contact on the fixed contact, when the mass of the movable contact is low.

Selon le document DE-B-1227978, une cale isolante est insérée sans jeu entre les deux brins du conducteur d'amenée de courant. Cette cale ne repose sur aucune butée du boîtier.According to document DE-B-1227978, an insulating shim is inserted without play between the two strands of the current supply conductor. This wedge does not rest on any stop of the housing.

Le disjoncteur selon l'invention est caractérisé en ce que

  • - une enclume constituée par un bloc métallique rigide est intercalée entre les deux brins du conducteur d'amenée de courant, en étant accolée contre le premier brin à l'opposé de la pièce de contact fixe, et en ménageant un entrefer avec l'autre brin,
  • - des rainures ménagées dans les parois latérales du boîtier servent de surfaces d'appui à l'enclume, laquelle se trouve rigidement assujettie au boîtier,
  • - l'extrémité du premier brin est libre et est maintenue par l'enclume,
  • - et le bloc métallique de l'enclume est réalisé en un matériau ferromagnétique de renforcement du champ magnétique de soufflage de l'arc vers la chambre de coupure.
The circuit breaker according to the invention is characterized in that
  • - an anvil consisting of a rigid metal block is interposed between the two strands of the current supply conductor, being placed against the first strand opposite the fixed contact piece, and providing an air gap with the other strand,
  • - grooves made in the side walls of the housing serve as bearing surfaces for the anvil, which is rigidly secured to the housing,
  • - the end of the first strand is free and is held by the anvil,
  • - And the metal block of the anvil is made of a ferromagnetic material to reinforce the magnetic field of the arc blowing towards the breaking chamber.

L'action favorable de l'enclume peut s'expliquer par une absence de rebondissement des contacts lors de la fermeture et de ce fait, d'un choc entre les contacts plus efficace à l'écrasement des surfaces de contact. Dans les disjoncteurs conventionnels, la masse de l'équipage mobile est suffisamment grande pour frapper fortement le contact mobile contre le contact fixe et assurer ainsi un écrasement de la surface de contact et une résistance de contact faible. Le même résultat est obtenu selon la présente invention pour un pont de contact de faible masse en accolant au contact fixe une enclume.The favorable action of the anvil can be explained by the absence of rebounding of the contacts during closing and therefore of a shock between the contacts which is more effective in crushing the contact surfaces. In conventional circuit breakers, the mass of the moving element is large enough to strike the moving contact strongly against the fixed contact and thus ensure a crushing of the contact surface and a low contact resistance. The same result is obtained according to the present invention for a low mass contact bridge by attaching an anvil to the fixed contact.

La présence de l'enclume permet d'assurer un appui stable du contact fixe, en l'occurrence constitué par la pièce de contact et le brin de conducteur d'amenée de courant sur l'enclume. L'enclume est de préférence en un matériau ferromagnétique feuilleté, pour éviter des courants de Foucault pouvant engendrer un échauffement additionnel.The presence of the anvil ensures stable support of the fixed contact, in this case constituted by the contact piece and the strand of current supply conductor on the anvil. The anvil is preferably made of a laminated ferromagnetic material, in order to avoid eddy currents which can generate additional heating.

L'invention est décrite en détail dans son application préférentielle à un disjoncteur limiteurdu type décrit dans la demande de brevet français n° 91 12793 déposée le 15.10.1991, dans laquelle le pont de contacts est monté flottant dans le barreau de commande. Il est clair que le système de contact à enclume est applicable à d'autres disjoncteurs à boîtier moulé.The invention is described in detail in its preferred application to a limiting circuit breaker of the type described in French patent application No. 91 12793 filed on 15.10.1991, in which the contact bridge is mounted floating in the control rod. It is clear that the anvil contact system is applicable to other molded case circuit breakers.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre, d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif, et représenté aux dessins annexés dans lesquels:

  • La figure 1 est une vue schématique des contacts d'un pôle d'un disjoncteur selon l'invention, représentés en position fermée.
  • La figure 2 est une vue analogue à celle de la figure 1 montrant les contacts en cours d'ouverture.
  • La figure 3 est une vue analogue à celle de la figure 1 montrant les contacts en position ouverte.
  • La figure 4 est une coupe suivant la ligne IV IV de la figure 1.
  • La figure 5 est une vue de détail en perspective montrant le pont de contact mobile et le barreau de commande.
Other advantages and characteristics will emerge more clearly from the description which follows, of an embodiment of the invention, given by way of nonlimiting example, and represented in the appended drawings in which:
  • Figure 1 is a schematic view of the contacts of a pole of a circuit breaker according to the invention, shown in the closed position.
  • Figure 2 is a view similar to that of Figure 1 showing the contacts being opened.
  • Figure 3 is a view similar to that of Figure 1 showing the contacts in the open position.
  • Figure 4 is a section along line IV IV of Figure 1.
  • Figure 5 is a detailed perspective view showing the movable contact bridge and the control rod.

Sur les figures, une boîte 10, en matière plastique isolante contient les éléments de coupure d'un pôle d'un disjoncteur limiteur à boîtier moulé, en l'occurrence, une paire de contacts fixes 11,12 et un pont de contacts mobile 13, ainsi que deux chambres de coupure non représentées. La boite 10 de forme générale parallélépipédique est constituée de deux grandes faces latérales 14,15, d'un fond 16 et d'une face supérieure 17, ainsi que de deux petites faces d'extrémités 18,19. Le pont de contacts mobile 13 est porté par un tronçon de barreau 20 rotatif, intercalé entre les deux grandes faces latérales 14,15. Le tronçon de barreau 20 présente un orifice 21 qui s'étend suivant un diamètre dans une direction parallèle aux grandes faces latérales et le pont de contacts 13 traverse cet orifice avec jeu en faisant saillie de part et d'autre du tronçon de barreau 20. Le pont de contacts 13 est monté flottant sur le tronçon de barreau 20 par deux paires de ressorts 22,23, de la manière décrite en détail par la suite. Deux conducteurs d'amenée de courant 24,25 traversent les petites faces d'extrémités, respectivement 18,19 et se prolongent à l'intérieur de la boîte 10 par une partie recourbée en forme de demi-boucle dont l'extrémité 26,27 porte la pièce de contact fixe 28,29 associée. En position de fermeture du pont de contact 13, la pièce de contact fixe 28 coopère avec le contact mobile 31 porté par le pont de contacts 13, tandis que la pièce de contact fixe 29 coopère avec le contact mobile 32. Le courant entrant à un instant donné par le conducteur d'amenée 24 parcourt les contacts fermés 28,31, le pont de contacts 13, les contacts fermés 32,29 pour sortir du côté opposé par le conducteur 25. On voit que les extrémités 26,27 sont parcourues par des courants de polarités opposées aux courants traversant le pont de contacts 13, en engendrant une force de répulsion dé- placant le pont de contacts 13 vers la position d'ouverture. Cette trajectoire en boucle dans la zone des contacts 28,31; 29,32 engendre un champ magnétique de soufflage de l'arc en direction des chambres de coupure. Un mécanisme de commande (non représenté) est accouplé au tronçon de barreau 20 pour commander sa rotation et de ce fait, l'ouverture et la fermeture des contacts 28,31; 29,32. Un tel disjoncteur est décrit en détail dans la demande de brevet français précitée n°91 12793 à laquelle on se reportera avantageusement pour de plus amples détails.In the figures, a box 10, made of insulating plastic material, contains the cut-off elements of a pole of a limiting circuit breaker with molded housing, in this case, a pair of fixed contacts 11,12 and a movable contact bridge 13 , as well as two interrupting chambers not shown. The box 10 of generally rectangular shape is made up of two large lateral faces 14,15, a bottom 16 and an upper face 17, as well as two small end faces 18,19. The mobile contact bridge 13 is carried by a rotary bar section 20, interposed between the two large lateral faces 14,15. The bar section 20 has an orifice 21 which extends along a diameter in a direction parallel to the large lateral faces and the contact bridge 13 crosses this orifice with play, projecting on either side of the bar section 20. The contact bridge 13 is mounted floating on the bar section 20 by two pairs of springs 22, 23, in the manner described in detail below. Two current supply conductors 24.25 pass through the small end faces, respectively 18.19 and extend inside the box 10 by a curved part in the form of a half-loop whose end 26.27 carries the associated fixed contact part 28, 29. In the closed position of the contact bridge 13, the fixed contact part 28 cooperates with the movable contact 31 carried by the contact bridge 13, while the fixed contact part 29 cooperates with the mobile contact 32. The incoming current at a instant given by the supply conductor 24 travels through the closed contacts 28, 31, the contact bridge 13, the closed contacts 32, 29 to exit from the opposite side by the conductor 25. It can be seen that the ends 26, 27 are traversed by currents of opposite polarities to the currents passing through the contact bridge 13, generating a repulsive force displacing the contact bridge 13 towards the open position. This loop path in the contact area 28,31; 29.32 generates a magnetic field for blowing the arc in the direction of the breaking chambers. A control mechanism (not shown) is coupled to the bar section 20 to control its rotation and therefore, the opening and closing of the contacts 28,31; 29.32. Such a circuit breaker is described in detail in the aforementioned French patent application No. 91 12793 to which reference will advantageously be made for further details.

Les parties des conducteurs d'amenée de courant 24,25, internes à la boîte 10, sont sensiblement symétriques et seule la disposition du conducteur d'amenée 25 est décrite en détail ci-dessous , celle du conducteur d'amenée 24 étant identique. Le conducteur d'amenée 25 accolé au fond 16 est engagé latéralement dans les encoches 30 ménagées dans les deux grandes faces latérales 14,15. La largeur du conducteur méplat 25 est réduite dans la zone recourbée et à son extrémité 27, en ménageant un jeu entre le conducteur et les grandes faces latérales 14,15. Une enclume 33, formée par un bloc métallique rigide, est intercalée entre les deux branches de la demi-boucle du conducteur 25, en étant accolée à la face de l'extrémité 27 opposée à celle portant le contact fixe 29. L'enclume 33 est rigidement assujettie à la boîte 10 par ses extrémités 35, engagées dans des rainures 36 ménagées dans les grandes faces latérales 14,15. L'enclume 33 est séparée de l'autre branche du conducteur 25 par un entrefer 34 et le bloc métallique est feuilleté pour limiter les courants de Foucault engendrés dans le bloc 33. On comprend que lorsque le pont de contacts 13 se ferme, le contact mobile 32 vient frapper le contact fixe 29 et le choc est transmis à l'enclume 33 qui évite tout rebondissement du contact fixe 29 et amplifie le coup porté sur le contact fixe 29. Ce coup provoque un écrasement des surfaces en contact et une réduction de la résistance de contact, laquelle ne présente aucune dispersion. Le bloc métallique 33 est en un matériau ferromagnétique augmentant le champ magnétique engendré par le passage du courant dans le conducteur d'amenée 25, pour souffler l'arc en direction de la chambre de coupure. L'entrefer 34 évite tout court- circuitage de la demi-boucle mais il est clair qu'une isolation additionnelle peut être prévue.The parts of the current supply conductors 24.25, internal to the box 10, are substantially symmetrical and only the arrangement of the supply conductor 25 is described in detail below, that of the supply conductor 24 being identical. The supply conductor 25 attached to the bottom 16 is engaged laterally in the notches 30 formed in the two large lateral faces 14,15. The width of the flat conductor 25 is reduced in the curved region and at its end 27, leaving a clearance between the conductor and the large lateral faces 14,15. An anvil 33, formed by a rigid metal block, is interposed between the two branches of the half-loop of the conductor 25, being attached to the face of the end 27 opposite to that carrying the fixed contact 29. The anvil 33 is rigidly secured to the box 10 by its ends 35, engaged in grooves 36 formed in the large lateral faces 14,15. The anvil 33 is separated from the other branch of the conductor 25 by an air gap 34 and the metal block is laminated to limit the eddy currents generated in the block 33. It is understood that when the contact bridge 13 closes, the contact mobile 32 strikes the fixed contact 29 and the shock is transmitted to the anvil 33 which prevents any rebound of the fixed contact 29 and amplifies the blow on the fixed contact 29. This blow causes crushing of the surfaces in contact and a reduction in contact resistance, which has no dispersion. The metal block 33 is made of a ferromagnetic material increasing the magnetic field generated by the passage of current in the supply conductor 25, to blow the arc in the direction of the breaking chamber. The air gap 34 avoids any short-circuiting of the half-loop but it is clear that additional insulation can be provided.

L'entrefer 34 est inférieur à l'épaisseur de l'enclume 33.The air gap 34 is less than the thickness of the anvil 33.

En se référant plus particulièrement à la figure 5, on voit que les ressorts des paires de ressorts 22,23 sont disposés symétriquement de part et d'autre du pont de contacts 13, en encadrant ce dernier. D'autre part, les deux paires de ressorts 22,23 sont disposées symétriquement par rapport à l'axe fictif 37 de rotation du pont de contacts 13. L'une 38 des extrémités des ressorts 22 est ancrée à un axe 39 s'étendant parallèlement à l'axe fictif 37 et prenant appui dans une encoche 40 ménagée sur la face du pont de contacts 13, opposée à celle portant le contact mobile 32. L'autre extrémité 41 des ressorts de traction 22 est ancrée à une tige 42 montée à coulissement dans une encoche 43 ménagée dans le barreau 20. Les ressorts de traction 22 sollicitent la tige 42 vers le fond des encoches 43 et exercent par l'axe 39 un couple sur le pont de contacts 13 tendant à faire pivoter ce dernier en direction de fermeture. Les ressorts 23 sont agencés de la même manière, et les mêmes numéros de repères affectés d'un indice sont utilisés pour désigner les parties correspondantes. Les deux paires de ressorts 22,23 assurent un montage flottant du pont de contacts 13 dans l'orifice 21 en permettant une rotation du pont de contacts 13 autour de l'axe fictif 37. Un tel montage flottant est décrit dans le brevet français n°2.622.347. Les paires de ressorts 22, 23 assurent également la pression de contact en position de fermeture du pôle. Les paires de ressorts 22,23 sont disposées symétriquement par rapport à l'axe fictif de rotation 37, de façon à exercer en toute position du pont de contacts 13, un couple de rappel du pont de contacts 13 en position de fermeture. Ce couple diminue au fur et à mesure du déplacement du pont de contacts 13 vers la position d'ouverture, et les tiges d'ancrage 42,42' sont disposées de manière à interférer avec la trajectoire de pivotement du pont de contacts 13, en fin de course d'ouverture par répulsion du pont de contacts 13. A cet effet, les tranches du pont de contacts 13 portent ou sont conformées en surface de came 44,44' engageant en fin de course de répulsion, respectivement les tiges 42,42', en les faisant coulisser dans leur encoche 43, en direction d'élongation des ressorts 22,23. Cet engagement freine le mouvement du pont de contacts 13, et réduit ou annule le choc sur la butée de fin de course d'ouverture, par exemple constituée ou agencée sur le boîtier 10. Le profil des cames 44,44' est bien entendu déterminé pour obtenir une décelération progressive du pont de contacts 13 et il peut être agencé pour conserver en toute position un couple de rappel du pont de contacts vers la position de fermeture, ou inversement présenter un encliquetage de retenue du pont de contacts 13, en position répulsée ouverte. Dans le premier cas, le pont de contacts 13 se referme automatiquement si l'ouverture du disjoncteur n'est pas confirmée par la rotation du tronçon de barreau 20 commandée par le mécanisme, mais la course aller retour du pont de contacts 13 est ralentie par son freinage en fin de course. Ce ralentissement peut être suffisant pour assurer des sélectivités de déclenchement, en l'occurrence une ouverture d'un appareil en aval qui élimine le défaut. Dans le deuxième cas de retenue du pont de contacts 13 en position de répulsion, cet encliquetage est supprimé lors de la rotation du tronçon de barreau 20, actionné par le mécanisme, de manière à ramener le pont de contacts 13 dans la position initiale par rapport au barreau 20. Il est facile de voir que le système de freinage et/ou de retenue du pont de contacts 13, en position de répulsion ne nécessite aucune pièce additionnelle, et est particulièrement simple et efficace.Referring more particularly to FIG. 5, it can be seen that the springs of the pairs of springs 22, 23 are arranged symmetrically on either side of the contact bridge 13, framing the latter. On the other hand, the two pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis 37 of rotation of the contact bridge 13. One 38 of the ends of the springs 22 is anchored to an axis 39 extending parallel to the imaginary axis 37 and bearing in a notch 40 formed on the face of the contact bridge 13, opposite to that carrying the movable contact 32. The other end 41 of the tension springs 22 is anchored to a rod 42 mounted sliding in a notch 43 formed in the bar 20. The tension springs 22 urge the rod 42 towards the bottom of the notches 43 and exert by the axis 39 a torque on the contact bridge 13 tending to pivot the latter in the direction closing. The springs 23 are arranged in the same way, and the same reference numbers with an index are used to designate the corresponding parts. The two pairs of springs 22, 23 ensure a floating mounting of the contact bridge 13 in the orifice 21 by allowing rotation of the contact bridge 13 around the imaginary axis 37. Such a floating mounting is described in French patent n ° 2.622.347. The pairs of springs 22, 23 also provide the contact pressure in the closed position of the pole. The pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis of rotation 37, so as to exert in any position of the contact bridge 13, a return torque of the contact bridge 13 in the closed position. This torque decreases as the contact bridge 13 moves towards the open position, and the anchor rods 42, 42 ′ are arranged so as to interfere with the pivoting path of the contact bridge 13, in opening limit switch by repulsion of the contact bridge 13. To this end, the edges of the contact bridge 13 carry or are shaped on the cam surface 44, 44 'engaging the rods 42, 42' respectively at the end of the repulsion stroke, by sliding them in their notch 43, in the direction elongation of the springs 22,23. This engagement brakes the movement of the contact bridge 13, and reduces or cancels the impact on the opening end-of-travel stop, for example formed or arranged on the housing 10. The profile of the cams 44, 44 ′ is of course determined. to obtain a progressive deceleration of the contact bridge 13 and it can be arranged to keep in any position a restoring torque of the contact bridge towards the closed position, or conversely present a retaining snap of the contact bridge 13, in the repelled position opened. In the first case, the contact bridge 13 closes automatically if the opening of the circuit breaker is not confirmed by the rotation of the bar section 20 controlled by the mechanism, but the return travel of the contact bridge 13 is slowed down by its braking at the end of the race. This slowing down may be sufficient to ensure trigger selectivities, in this case an opening of a downstream device which eliminates the fault. In the second case of retention of the contact bridge 13 in the repulsion position, this snap-fastening is eliminated during the rotation of the bar section 20, actuated by the mechanism, so as to bring the contact bridge 13 back to the initial position relative to to the bar 20. It is easy to see that the braking and / or retaining system of the contact bridge 13, in the repulsion position does not require any additional part, and is particularly simple and effective.

L'invention est bien entendu nullement limitée au mode de mise en oeuvre plus particulièrement décrit.The invention is of course in no way limited to the embodiment more particularly described.

Claims (5)

1. Disjoncteur limiteur basse tension à boîtier moulé comprenant un pont de contacts rotatif (13), une paire de contacts fixes (11,12) coopérant avec ledit pont de contacts, un conducteur (24,25) d'amenée de courant à chacun desdits contacts fixes s'étendant dans le plan de débattement dudit pont de contacts (13) et conformé pour constituer avec le pont de contacts une trajectoire en boucle engendrant des forces électrodynamiques de répulsion, un barreau (20) ayant une ouverture transversale (21) dans laquelle est disposée la partie centrale du pont de contacts (13) avec une liberté de rotation en direction d'ouverture sous l'action desdites forces électrodynamiques à l'encontre d'une force élastique (22,23) assurant la pression de contact, le conducteur (24,25) d'amenée de courant étant agencé en demi-boucle ayant un premier et un deuxième brins parallèles espacés, le premier brin (26,27) portant une pièce de contact fixe (28,29), caractérisé en ce que - une enclume (33) constituée par un bloc métallique rigide est intercalée entre les deux brins du conducteur (24,25) d'amenée de courant, en étant accolée contre le premier brin (26,27) à l'opposé de la pièce de contact fixe (28,29), et en ménageant un entrefer (34) avec l'autre brin, - des rainures ménagées dans les parois latérales du boîtier servent de surfaces d'appui à l'enclume (33), laquelle se trouve rigidement assujettie au boîtier, - l'extrémité du premier brin (26,27) est libre et est maintenue par l'enclume (33), - et le bloc métallique de l'enclume (33) est réalisé en un matériau ferromagnétique de renforcement du champ magnétique de soufflage de l'arc vers la chambre de coupure. 1. Low voltage limiter circuit breaker with molded housing comprising a rotary contact bridge (13), a pair of fixed contacts (11,12) cooperating with said contact bridge, a conductor (24,25) for supplying current to each said fixed contacts extending in the plane of movement of said contact bridge (13) and shaped to constitute with the contact bridge a loop path generating electrodynamic repulsive forces, a bar (20) having a transverse opening (21) in which is disposed the central part of the contact bridge (13) with a freedom of rotation in the opening direction under the action of said electrodynamic forces against an elastic force (22,23) ensuring the contact pressure , the current supply conductor (24,25) being arranged in a half-loop having first and second spaced parallel strands, the first strand (26,27) carrying a fixed contact piece (28,29), characterized in that - an anvil (33) constituted by a rigid metal block is interposed between the two strands of the current supply conductor (24,25), being placed against the first strand (26,27) opposite the part fixed contact (28,29), and by providing an air gap (34) with the other strand, - grooves made in the side walls of the housing serve as bearing surfaces for the anvil (33), which is rigidly secured to the housing, - the end of the first strand (26,27) is free and is held by the anvil (33), - And the metal block of the anvil (33) is made of a ferromagnetic material to reinforce the magnetic field of the arc blowing towards the breaking chamber. 2. Disjoncteur selon la revendication 1, caractérisé en ce que lesdits contacts (11,12,13) sont logés avec des chambres de coupure associées dans une boîte isolante (10) unipolaire parallélépipèdi- que étroite, que les conducteurs (25,24) d'amenée de courant s'étendent à l'intérieur de la boîte (10) en appui interne respectivement du fond (16) et de la face supérieure (17) de la boîte (10), et que les extrémités (26,27) desdits conducteurs, portant les pièces de contacts fixes (28,29) et en appui de l'enclume (33), sont repliées en demi-boucle et sont montées libres dans ladite boite.2. Circuit breaker according to claim 1, characterized in that said contacts (11,12,13) are housed with associated interrupting chambers in an insulating box (10) unipolar parallelepiped narrow, that the conductors (25,24) current supply extend inside the box (10) in internal support respectively of the bottom (16) and the upper face (17) of the box (10), and that the ends (26,27 ) of said conductors, carrying the fixed contact parts (28, 29) and bearing on the anvil (33), are folded in half-loop and are mounted free in said box. 3. Disjoncteur selon la revendication 1, caractérisé en ce que ledit bloc (33) est feuilleté pour s'opposer aux courants de Foucault engendrés dans le bloc.3. Circuit breaker according to claim 1, characterized in that said block (33) is laminated to oppose the eddy currents generated in the block. 4. Disjoncteur selon la revendication 1, caractérisé en ce que le pont de contacts (13) est monté flottant dans le barreau de commande (20).4. Circuit breaker according to claim 1, characterized in that the contact bridge (13) is mounted floating in the control rod (20). 5. Disjoncteur selon la revendication 1, caractérisé en ce que l'entrefer (34) est inférieur à l'épaisseur de l'enclume (33).5. Circuit breaker according to claim 1, characterized in that the air gap (34) is less than the thickness of the anvil (33).
EP93420099A 1992-03-13 1993-03-05 Contact for moulded case circuit breaker Expired - Lifetime EP0560696B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203141 1992-03-13
FR9203141A FR2688625B1 (en) 1992-03-13 1992-03-13 CONTACT OF A MOLDED BOX CIRCUIT BREAKER

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EP0560696A1 true EP0560696A1 (en) 1993-09-15
EP0560696B1 EP0560696B1 (en) 1996-05-15

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EP93420099A Expired - Lifetime EP0560696B1 (en) 1992-03-13 1993-03-05 Contact for moulded case circuit breaker

Country Status (4)

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US (1) US5313180A (en)
EP (1) EP0560696B1 (en)
DE (1) DE69302610T2 (en)
FR (1) FR2688625B1 (en)

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Also Published As

Publication number Publication date
EP0560696B1 (en) 1996-05-15
DE69302610D1 (en) 1996-06-20
US5313180A (en) 1994-05-17
FR2688625B1 (en) 1997-05-09
FR2688625A1 (en) 1993-09-17
DE69302610T2 (en) 1996-11-07

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