EP0555158B1 - Operating mechanism for a moulded case circuit breaker - Google Patents

Operating mechanism for a moulded case circuit breaker Download PDF

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Publication number
EP0555158B1
EP0555158B1 EP93420026A EP93420026A EP0555158B1 EP 0555158 B1 EP0555158 B1 EP 0555158B1 EP 93420026 A EP93420026 A EP 93420026A EP 93420026 A EP93420026 A EP 93420026A EP 0555158 B1 EP0555158 B1 EP 0555158B1
Authority
EP
European Patent Office
Prior art keywords
handle
latch
toggle
operating mechanism
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93420026A
Other languages
German (de)
French (fr)
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EP0555158A1 (en
Inventor
Jean-Pierre Nereau
Philippe Perrier
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Schneider Electric SE
Original Assignee
Schneider Electric SE
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Publication of EP0555158A1 publication Critical patent/EP0555158A1/en
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Publication of EP0555158B1 publication Critical patent/EP0555158B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2041Rotating bridge
    • H01H1/2058Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/501Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/52Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/1054Means for avoiding unauthorised release
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/505Latching devices between operating and release mechanism

Definitions

  • a fault occurs, in particular an overload or a short circuit
  • the contacts open automatically under the action of a trigger and the handle comes into a tripped position intermediate between the position of closing and opening position.
  • Resetting the circuit breaker requires moving the handle, beyond the open position, to a reset position where the hook is brought into the locked position.
  • This reset position is an unstable position and the handle automatically returns to the open position when it is released. With the hook locked, the circuit breaker can again be closed and opened by manual control, or open automatically when a fault occurs.
  • the present invention aims to allow the realization of a circuit breaker mechanism holding the handle and the hook in the armed position, during an untimely tripping.
  • the mechanism according to the invention is characterized in that the cam surface includes a slope change point delimiting two successive sections, a first section corresponding substantially to the stroke of the handle between the triggered position and the reset position, and a second section corresponding to the rearmed position, the slope of the first section being such that the result of the forces derived from the spring and exerted on the handle urges the handle in the released position, and the slope of the second section being such that the handle is biased in the rearmed position arranged in the stable position for holding the hook.
  • the resetting position of the handle is made stable and in this position, this handle maintains the hook independently of the position of the latch.
  • a triggering action which releases the lock is not hampered but it has no effect, the hook remaining held by the handle. This avoids any risk of deterioration of the triggering and locking system likely to occur in the event of a mechanical blocking of these systems to avoid untimely disarming.
  • the hook is articulated by one of its ends on a fixed axis, and the opposite end is arranged on the locking surface cooperating with the lock.
  • the toggle joint is articulated at an intermediate point of the hook and the cam surface extends on the side of the end carrying the locking surface.
  • the length of the second section of the cam is reduced, for example to a value less than the diameter of the roller, so as to have an arming stroke corresponding to the length of the relatively large first section.
  • the invention is applicable to any circuit breaker mechanism with tilting handle, the resetting of which is ensured by a displacement of the handle towards or beyond the open position.
  • Figure 1 is a schematic perspective view of a pole of a circuit breaker according to the invention.
  • Figure 2 is an axial sectional view of the circuit breaker according to the invention, shown in the closed position.
  • Figure 3 is a partial view showing the mechanism in the closed position.
  • Figures 4 and 5 are views similar to that of Figure 3, showing the mechanism respectively in the open-cocked position, and triggered.
  • FIGs 1 and 2 we recognize a pole of a molded case circuit breaker.
  • the pole 10 comprises a box 11 of molded insulating material in which are housed a contact bridge 12 which cooperates with fixed contacts 13, and breaking chambers 14.
  • the contact bridge 12 is carried by a section of bar 15 whose pivoting, causing the opening and closing of the contacts 12,13, is controlled by a mechanism designated by the general reference 16.
  • the mechanism 16 comprises two spaced flanges 17 secured to the box 11 by rods 18. At the bottom of the flanges 17, which frame the box 11, is pivotally mounted a crank 19 secured by bars 20 to the bar sections 15. On the flanges 17 is articulated by an axis 21, a handle support 22 carrying a handle 23. On a fixed axis 24 integral with the flanges 17, the end 25 of a hook 26 is rotatably mounted, the opposite end of which carries or is arranged on the locking surface 27.
  • the crank 19 is mechanically connected to the hook 26 by a toggle 28 constituted by a first lever 29 articulated by a toggle pin 30 to a second lever 31, itself articulated by an axis 32 on the hook 26.
  • a tension spring 33 is anchored, on the one hand to the toggle pin 30, and on the other hand at a point 34 to the support of handle 22.
  • a lock 36 articulated on an axis 35 is biased in the hook locking position 26 shown in FIGS. 3 and 4. In the locked position, the hook 26 exerts by the locking surface 27, a force on the bolt 36 urging the latter in the unlocking direction by pivoting clockwise in FIGS. 3 and 4.
  • the lock 36 is held in the locking position by a hook 37, controlled by a trigger (not shown) causing the opening circuit breaker automatically when a fault occurs.
  • the handle support 22 carries a roller 38 which cooperates with a cam surface 39 arranged on the upper face of the hook 26.
  • FIG. 4 shows the balance of forces acting on the handle 23.
  • This handle is subjected on the one hand to a direct action of the spring 33, on its anchor point 34, this force being represented by the arrow F1 on Figure 6. It is off-center by a lever arm D1 relative to the pivot axis 21 of the handle 23 and urges the latter in the reset position.
  • the spring 33 exerts on the other hand, by means of the first lever 29 of the toggle of the hook 26 and of the second section 40 of the cam 39, a force F2 eccentric of a lever arm D2 relative to the axis pivot 21 of the handle. The movement generated by this force F2 tends to move the handle 23 towards the closed position against the torque generated by the force F1.
  • the system is arranged so that the torque generated by the force F1 is greater than that generated by the force F2, to urge the handle 23 in the reset position.
  • This can be obtained by an appropriate choice of the slope of the second section 42 of the cam 39 which modifies the lever arm D2.
  • the length of the second section 42 can be reduced, for example to a value close to the diameter of the roller 38, so as to maintain a significant length of the first section 41 and thus limit the actuating force of the handle 23 for maneuvering rearmament.
  • the invention is of course applicable to other types of mechanism or locking, and it can be used for single-circuit breakers.

Description

L'invention est relative à un mécanisme de commande d'un disjoncteur électrique basse tension à boîtier moulé comprenant:

  • au moins un contact mobile, dont l'ouverture et la fermeture manuelle, et l'ouverture automatique lors de l'apparition d'un défaut, sont commandées par ledit mécanisme,
  • un crochet articulé sur un axe fixe et ayant une surface de came,
  • une genouillère constituée d'un axe de genouillère, d'un premier levier relié d'une part au contact mobile et d'autre part à l'axe de genouillère, et d'un deuxième levier articulé d'une part au crochet et d'autre part à l'axe de genouillère,
  • un ressort ancré d'une part à l'axe de genouillère et d'autre part à une poignée de commande de l'ouverture et de la fermeture des contacts,
  • un verrou susceptible de coopérer avec ledit crochet pour maintenir ce dernier en position verrouillé,
  • et un galet suiveur de came actionné par la poignée et susceptible de coopérer avec la surface de came du crochet pour amener le crochet en position verrouillée, ladite poignée pouvant venir en trois positions distinctes, une position fermée dans laquelle le ressort sollicite la genouillère en position d'extension, une position d'ouverture manuelle et de réarmement où le ressort sollicite la genouillère en position brisée, le crochet étant en position verrouillée, et une position déclenchée dans laquelle le crochet est déverrouillé et la genouillère brisée.
The invention relates to a control mechanism for a low-voltage electric circuit breaker with a molded housing comprising:
  • at least one movable contact, whose manual opening and closing, and automatic opening when a fault occurs, are controlled by said mechanism,
  • a hook articulated on a fixed axis and having a cam surface,
  • a toggle consisting of a toggle pin, a first lever connected on the one hand to the movable contact and on the other hand to the toggle axis, and a second lever articulated on the one hand to the hook and d on the other hand to the knee support axis,
  • a spring anchored on the one hand to the toggle pin and on the other hand to a handle for opening and closing the contacts,
  • a lock capable of cooperating with said hook to keep the latter in the locked position,
  • and a cam follower roller actuated by the handle and capable of cooperating with the cam surface of the hook to bring the hook into the locked position, said handle being able to come in three distinct positions, a closed position in which the spring urges the toggle in position extension, a manual opening and resetting position where the spring urges the toggle in the broken position, the hook being in the locked position, and a triggered position in which the hook is unlocked and the toggle broken.

Un disjoncteur du genre mentionné, par exemple décrit dans le brevet français 2.583.570 (& EP-A-0 206 883), comporte une poignée de commande dont le pivotement dans un sens ou dans l'autre provoque l'ouverture et la fermeture des contacts du disjoncteur. Lors de l'apparition d'un défaut, notamment d'une surcharge ou d'un court-circuit, les contacts s'ouvrent automatiquement sous l'action d'un déclencheur et la poignée vient dans une position déclenchée intermédiaire entre la position de fermeture et la position d'ouverture. Le réarmement du disjoncteur nécessite le déplacement de la manette, au-delà de la position ouvert, vers une position de réarmement où le crochet est amené dans la position de verrouillage. Cette position de réarmement est une position instable et la poignée revient automatiquement dans la position ouvert lorsqu'elle est lâchée. Le crochet étant verrouillé, le disjoncteur peut à nouveau être refermé et ouvert par commande manuelle, ou s'ouvrir automatiquement lors de l'apparition d'un défaut. Un déverrouillage intempestif du crochet peut intervenir alors que le disjoncteur est ouvert et ce déverrouillage provoque bien entendu le désarmement du mécanisme et le retour de la poignée en position déclenchée. Le désarmement intempestif peut résulter d'une fausse commande ou d'une action mécanique sur le disjoncteur, ou pour toute autre raison et une seconde opération de réarmement est nécessaire avant de pouvoir refermer le disjoncteur. De telles anomalies de fonctionnement peuvent être gênantes, notamment lors de télécommandes.A circuit breaker of the type mentioned, for example described in French patent 2,583,570 (& EP-A-0 206 883), includes a control handle, pivoting in one direction or the other causes the opening and closing of the circuit breaker contacts. When a fault occurs, in particular an overload or a short circuit, the contacts open automatically under the action of a trigger and the handle comes into a tripped position intermediate between the position of closing and opening position. Resetting the circuit breaker requires moving the handle, beyond the open position, to a reset position where the hook is brought into the locked position. This reset position is an unstable position and the handle automatically returns to the open position when it is released. With the hook locked, the circuit breaker can again be closed and opened by manual control, or open automatically when a fault occurs. An untimely unlocking of the hook can occur while the circuit breaker is open and this unlocking of course causes the mechanism to disarm and the handle to return to the tripped position. Unintentional disarming can result from a false command or a mechanical action on the circuit breaker, or for any other reason and a second reset operation is necessary before the circuit breaker can be closed. Such operating anomalies can be annoying, especially during remote controls.

La présente invention a pour but de permettre la réalisation d'un mécanisme de disjoncteur maintenant la poignée et le crochet en position armée, lors d'un déclenchement intempestif.The present invention aims to allow the realization of a circuit breaker mechanism holding the handle and the hook in the armed position, during an untimely tripping.

Le mécanisme selon l'invention est caractérisé en ce que la surface de came comporte un point de changement de pente délimitant deux sections successives, une première section correspondant sensiblement à la course de la poignée entre la position déclenchée et la position réarmée, et une deuxième section correspondant à la position réarmée, la pente de la première section étant telle, que la résultante des forces dérivées du ressort et exercées sur la poignée sollicite la poignée en position déclenchée, et la pente de la deuxième section étant telle, que la poignée est sollicitée en position réarmée agencée en position stable de maintien du crochet.The mechanism according to the invention is characterized in that the cam surface includes a slope change point delimiting two successive sections, a first section corresponding substantially to the stroke of the handle between the triggered position and the reset position, and a second section corresponding to the rearmed position, the slope of the first section being such that the result of the forces derived from the spring and exerted on the handle urges the handle in the released position, and the slope of the second section being such that the handle is biased in the rearmed position arranged in the stable position for holding the hook.

En modifiant le profil de la came,la position de réarmement de la poignée est rendue stable et dans cette position, cette poignée maintient le crochet indépendamment de la position du verrou. Une action de déclenchement qui libère le verrou n'est pas entravée mais elle reste sans effet, le crochet restant maintenu par la poignée. On évite ainsi tout risque de détérioration du système de déclenchement et de verrouillage susceptible d'intervenir en cas d'un blocage mécanique de ces systèmes pour éviter des désarmements intempestifs.By modifying the profile of the cam, the resetting position of the handle is made stable and in this position, this handle maintains the hook independently of the position of the latch. A triggering action which releases the lock is not hampered but it has no effect, the hook remaining held by the handle. This avoids any risk of deterioration of the triggering and locking system likely to occur in the event of a mechanical blocking of these systems to avoid untimely disarming.

Le crochet est articulé par l'une de ses extrémités sur un axe fixe, et l'extrémité opposée est agencée en surface de verrouillage coopérant avec le verrou. La genouillère est articulée en un point intermédiaire du crochet et la surface de came s'étend du côté de l'extrémité portant la surface de verrouillage. La longueur de la deuxième section de la came est réduite, par exemple à une valeur inférieure au diamètre du galet,de façon à disposer d'une course d'armement correspondant à la longueur de la première section relativement importante.The hook is articulated by one of its ends on a fixed axis, and the opposite end is arranged on the locking surface cooperating with the lock. The toggle joint is articulated at an intermediate point of the hook and the cam surface extends on the side of the end carrying the locking surface. The length of the second section of the cam is reduced, for example to a value less than the diameter of the roller, so as to have an arming stroke corresponding to the length of the relatively large first section.

L'invention est applicable à tout mécanisme de disjoncteur à poignée basculante, dont le réarmement est assuré par un déplacement de la poignée vers ou au delà de la position ouvert.The invention is applicable to any circuit breaker mechanism with tilting handle, the resetting of which is ensured by a displacement of the handle towards or beyond the open position.

D'autres avantages et caractéristiques preferrées ressortiront plus clairement de la description qui va suivre, d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple et représenté aux dessins annexés dans lesquels:Other advantages and preferred characteristics will emerge more clearly from the description which follows, of an embodiment of the invention, given by way of example and shown in the accompanying drawings in which:

La figure 1 est une vue schématique en perspective d'un pôle d'un disjoncteur selon l'invention.Figure 1 is a schematic perspective view of a pole of a circuit breaker according to the invention.

La figure 2 est une vue en coupe axiale du disjoncteur selon l'invention, représentée en position fermé.Figure 2 is an axial sectional view of the circuit breaker according to the invention, shown in the closed position.

La figure 3 est une vue partielle montrant le mécanisme en position fermé.Figure 3 is a partial view showing the mechanism in the closed position.

Les figures 4 et 5 sont des vues analogues à celle de la figure 3, montrant le mécanisme respectivement en position ouvert-armé, et déclenché.Figures 4 and 5 are views similar to that of Figure 3, showing the mechanism respectively in the open-cocked position, and triggered.

Sur les figures 1 et 2, on reconnaît un pôle d'un disjoncteur à boîtier moulé. Le pôle 10 comporte une boîte 11 en matière isolante moulée dans laquelle sont logés un pont de contact 12 qui coopère avec des contacts fixes 13, et des chambres de coupure 14. Le pont de contact 12 est porté par un tronçon de barreau 15 dont le pivotement, provoquant l'ouverture et la fermeture des contacts 12,13, est commandé par un mécanisme désigné par le repère général 16.In Figures 1 and 2, we recognize a pole of a molded case circuit breaker. The pole 10 comprises a box 11 of molded insulating material in which are housed a contact bridge 12 which cooperates with fixed contacts 13, and breaking chambers 14. The contact bridge 12 is carried by a section of bar 15 whose pivoting, causing the opening and closing of the contacts 12,13, is controlled by a mechanism designated by the general reference 16.

Le mécanisme 16 comporte deux flasques espacés 17 solidarisés à la boîte 11 par des tiges 18. A la partie inférieure des flasques 17, qui encadrent la boîte 11, est montée à pivotement une manivelle 19 solidarisée par des barres 20 aux tronçons de barreau 15. Sur les flasques 17 est articulé par un axe 21, un support de poignée 22 portant une poignée 23. Sur un axe fixe 24 solidaire des flasques 17, est montée à rotation l'extrémité 25 d'un crochet 26 dont l'extrémité opposée porte ou est agencée en surface de verrouillage 27. La manivelle 19 est reliée mécaniquement au crochet 26 par une genouillère 28 constituée par un premier levier 29 articulé par un axe de genouillère 30 à un deuxième levier 31, lui-même articulé par un axe 32 sur le crochet 26. Un ressort de traction 33 est ancré, d'une part à l'axe de genouillère 30, et d'autre part en un point 34 au support de poignée 22. Un verrou 36 articulé sur un axe 35 est sollicité en position de verrouillage du crochet 26 représentée sur les figures 3 et 4. En position verrouillée,le crochet 26 exerce par la surface de verrouillage 27, une force sur le verrou 36 sollicitant ce dernier en direction de déverrouillage par pivotement dans le sens des aiguilles d'une montre sur les figures 3 et 4. Le verrou 36 est maintenu en position de verrouillage par un accrochage 37, commandé par un déclencheur (non représenté) provoquant l'ouverture automatique du disjoncteur lors de l'apparition d'un défaut.The mechanism 16 comprises two spaced flanges 17 secured to the box 11 by rods 18. At the bottom of the flanges 17, which frame the box 11, is pivotally mounted a crank 19 secured by bars 20 to the bar sections 15. On the flanges 17 is articulated by an axis 21, a handle support 22 carrying a handle 23. On a fixed axis 24 integral with the flanges 17, the end 25 of a hook 26 is rotatably mounted, the opposite end of which carries or is arranged on the locking surface 27. The crank 19 is mechanically connected to the hook 26 by a toggle 28 constituted by a first lever 29 articulated by a toggle pin 30 to a second lever 31, itself articulated by an axis 32 on the hook 26. A tension spring 33 is anchored, on the one hand to the toggle pin 30, and on the other hand at a point 34 to the support of handle 22. A lock 36 articulated on an axis 35 is biased in the hook locking position 26 shown in FIGS. 3 and 4. In the locked position, the hook 26 exerts by the locking surface 27, a force on the bolt 36 urging the latter in the unlocking direction by pivoting clockwise in FIGS. 3 and 4. The lock 36 is held in the locking position by a hook 37, controlled by a trigger (not shown) causing the opening circuit breaker automatically when a fault occurs.

Dans la position fermée représentée à la figure 3, la poignée est placée dans la position fermée, et le ressort 33 sollicite la genouillère 28 en extension maintenant le pont de contact 12, en position fermée. Cette position est une position stable et une ouverture manuelle du disjoncteur est provoquée par un pivotement de la poignée dans le sens des aiguilles d'une montre sur la figure 3 qui après passage d'un point mort, provoque le brisage de la genouillère 28 sous l'action du ressort 33. Dans la position ouvert représentée sur la figure 4, qui est également une position stable, la genouillère 28 maintient le point de contact 12 en position ouvert. Dans ces deux positions, le crochet 26 est verrouillé par le verrou 36. Une ouverture automatique du disjoncteur à partir de la position fermée représentée à la figure 3, est commandée par le déclencheur, libérant l'accrochage 37 et provoquant le deverrouillage par pivotement du verrou 36 et libération de la surface de came 27. Sous l'action du ressort 33, le crochet 26 libéré pivote dans le sens inverse des aiguilles d'une montre et provoque l'ouverture du pont de contact 12, en déplaçant la poignée vers la position déclenchée représentée sur la figure 5. Cette position intermédiaire entre les positions fermées et ouvert de la poignée 23 est également une position stable, et le réarmement du mécanisme 10 est engendré par une action manuelle déplaçant la poignée 23 de la position déclenchée vers la position ouvert, (figure 4). Le support de poignée 22 porte un galet 38 qui coopère avec une surface de came 39 agencée sur la face supérieure du crochet 26.In the closed position shown in FIG. 3, the handle is placed in the closed position, and the spring 33 urges the toggle joint 28 in extension, maintaining the contact bridge 12, in the closed position. This position is a stable position and manual opening of the circuit breaker is caused by a pivoting of the handle in a clockwise direction in FIG. 3 which, after passing through neutral, causes the toggle joint 28 to break under the action of the spring 33. In the open position shown in FIG. 4, which is also a stable position, the toggle joint 28 maintains the contact point 12 in the open position. In these two positions, the hook 26 is locked by the latch 36. An automatic opening of the circuit breaker from the closed position shown in FIG. 3 is controlled by the trigger, releasing the hooking 37 and causing the unlocking by pivoting of the latch 36 and release of the cam surface 27. Under the action of the spring 33, the released hook 26 pivots anti-clockwise and causes the contact bridge 12 to open, by moving the handle towards the triggered position shown in FIG. 5. This intermediate position between the closed and open positions of the handle 23 is also a stable position, and the resetting of the mechanism 10 is generated by a manual action moving the handle 23 from the released position to the open position, (Figure 4). The handle support 22 carries a roller 38 which cooperates with a cam surface 39 arranged on the upper face of the hook 26.

En se référant aux figures 4 et 5, on voit que le galet 38 impose au cours du pivotement de la poignée 23 un déplacement vers le bas, sur la figure 5, du crochet 26 qui pivote dans le sens des aiguilles d'une montre pour venir en fin de course de la poignée 23 en position de verrouillage représentée sur la figure 4. La surface de came 39 présente au voisinage de la position de réarmement, un point 40 de changement de pente intermédiaire à une première section 41 de déplacement du crochet 26 vers la position de réarmement, et d'une deuxième section 42 de maintien de la poignée 23 en position réarmée. La position réarmée de la poignée 23, représentée à la figure 4 est une position stable,et cette poignée reste donc dans cette position lorsqu'on la lâche. Dans cette position l'accrochage 37 est libre de pivoter, la libération du verrou 36 n'ayant aucun effet sur le crochet 26 qui est maintenu par le galet 38. Un désarmement intempestif est ainsi exclu et le disjoncteur reste en position armée, prêt à une manoeuvre de fermeture, par un déplacement inverse de la poignée 23 vers la position de fermeture.Referring to Figures 4 and 5, we see that the roller 38 requires during the pivoting of the handle 23 a downward movement, in Figure 5, the hook 26 which pivots clockwise to come to the end of the stroke of the handle 23 in the locking position shown in FIG. 4. The cam surface 39 has, in the vicinity of the reset position, a point 40 for changing the slope intermediate to a first section 41 of displacement of the hook 26 to the reset position, and a second section 42 for holding the handle 23 in the reset position. The reset position of the handle 23, shown in FIG. 4 is a stable position, and this handle therefore remains in this position when it is released. In this position, the attachment 37 is free to pivot, the release of the lock 36 having no effect on the hook 26 which is held by the roller 38. An untimely disarming is thus excluded and the circuit breaker remains in the armed position, ready to a closing maneuver, by a reverse movement of the handle 23 towards the closed position.

Sur la figure 4 est représenté l'équilibre des forces agissant sur la poignée 23. Cette poignée est soumise d'une part à une action directe du ressort 33, sur son point d'ancrage 34, cette force étant représentée par la flêche F1 sur la figure 6.Elle est excentrée d'un bras de levier D1 par rapport à l'axe de pivotement 21 de la poignée 23 et sollicite cette dernière en position de réarmement. Le ressort 33 exerce d'autre part, par l'intermédiaire du premier levier 29 de genouillère du crochet 26 et de la deuxième section 40 de la came 39, une force F2 excentrée d'un bras de levier D2 par rapport à l'axe de pivotement 21 de la poignée. Le mouvement engendré par cette force F2 tend à déplacer la poignée 23 vers la position de fermeture à l'encontre du couple engendré par la force F1. Selon l'invention, le système est agencé de manière que le couple engendré par la force F1 est supérieur à celui engendré par la force F2, pour solliciter la poignée 23 en position de réarmement. Cela peut être obtenu par un choix approprié de la pente de la deuxième section 42 de la came 39 qui modifie le bras de levier D2. La longueur de la deuxième section 42 peut être réduite, par exemple à une valeur voisine du diamètre du galet 38, de façon à conserver une longueur notable de la première section 41 et limiter ainsi la force d'actionnement de la poignée 23 pour la manoeuvre de réarmement.FIG. 4 shows the balance of forces acting on the handle 23. This handle is subjected on the one hand to a direct action of the spring 33, on its anchor point 34, this force being represented by the arrow F1 on Figure 6. It is off-center by a lever arm D1 relative to the pivot axis 21 of the handle 23 and urges the latter in the reset position. The spring 33 exerts on the other hand, by means of the first lever 29 of the toggle of the hook 26 and of the second section 40 of the cam 39, a force F2 eccentric of a lever arm D2 relative to the axis pivot 21 of the handle. The movement generated by this force F2 tends to move the handle 23 towards the closed position against the torque generated by the force F1. According to the invention, the system is arranged so that the torque generated by the force F1 is greater than that generated by the force F2, to urge the handle 23 in the reset position. This can be obtained by an appropriate choice of the slope of the second section 42 of the cam 39 which modifies the lever arm D2. The length of the second section 42 can be reduced, for example to a value close to the diameter of the roller 38, so as to maintain a significant length of the first section 41 and thus limit the actuating force of the handle 23 for maneuvering rearmament.

L'invention est bien entendu applicable à d'autres types de mécanisme ou de verrouillage, et elle est utilisable pour des disjoncteurs à simple coupure.The invention is of course applicable to other types of mechanism or locking, and it can be used for single-circuit breakers.

Claims (6)

  1. An operating mechanism of a moulded case low-voltage electrical circuit breaker comprising :
    - at least one movable contact (12), whose manual opening and closing, and automatic opening when a fault occurs, are controlled by said mechanism (16),
    - a latch (26) articulated on a fixed spindle (24) and having a cam surface (39),
    - a toggle (28) formed by a toggle spindle (30), a first lever (29) linked on the one hand to the movable contact (12) and on the other hand to the toggle spindle (30), and a second lever (31) articulated on the one hand on the latch (26) and on the other hand on the spindle (30) of the toggle (28),
    - a spring (33) attached on the one hand to the toggle spindle (30) and on the other hand to a handle (23) for performing opening and closing of the contacts,
    - a lock (36) designed to cooperate with said latch (26) to hold the latter in the locked position,
    - and a cam-follower roller (38) actuated by the handle (23) and designed to cooperate with the cam surface (39) of the latch (26) to move the latch (26) to the locked position, said handle (23) being able to move to three distinct positions, a closed position in which the spring (33) urges the toggle (28) to the extension position, a manual opening and resetting position where the spring (33) urges the toggle (28) to the broken position, the latch (26) being in the locked position, and a tripped position in which the latch (26) is unlocked and the toggle (28) broken,
    characterized in that
    the cam surface (39) comprises a slope change point (40) marking the limit between two successive sections (41, 42), a first section (41) corresponding appreciably to the travel of the handle (23) between the tripped position and the reset position, and a second section (42) corresponding to the reset position, the slope of the first section (41) being such that the resultant of the forces derived from the spring (33) and exerted on the handle (23) urges the handle to the tripped position, and the slope of the second section (42) being such that the handle (23) is urged to the reset position arranged as a stable position holding the latch (26).
  2. The operating mechanism according to claim 1, characterized in that the latch (26) has an end (25) articulated on said fixed spindle (24) and an opposite end having a locking surface (27) cooperating with said lock (36) and that the articulation spindle (32) of said second lever (31) on the latch (26) is inserted between these two ends.
  3. The operating mechanism according to claim 1 or 2, characterized in that said lock (36) is urged in the unlocking direction by the latch (26) and is kept locked by a catch (37) controlled by a trip device.
  4. The operating mechanism according to claim 1, 2 or 3, characterized in that in the reset position the spring (33) exerts directly on the handle (23) a first force (F1) whose moment urges the handle (23) to the set position and that the spring (33) exerts indirectly via the second lever (31), latch (26), second cam section (42) and roller (38), a second force (F2) whose moment which urges the handle (23) in the reverse tripping direction is smaller than the moment of the first force (F1).
  5. The operating mechanism according to claim 1, 2, 3 or 4, characterized in that the length of said second section (42) is close to the diameter of the roller (38).
  6. The operating mechanism according to any one of the above claims, characterized in that in the reset position of the handle (23), the roller (38) holds the latch (26) in a loaded position slightly beyond the locking position defined by the lock (36).
EP93420026A 1992-02-07 1993-01-21 Operating mechanism for a moulded case circuit breaker Expired - Lifetime EP0555158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9201486 1992-02-07
FR9201486A FR2687249B1 (en) 1992-02-07 1992-02-07 CONTROL MECHANISM OF A MOLDED BOX CIRCUIT BREAKER.

Publications (2)

Publication Number Publication Date
EP0555158A1 EP0555158A1 (en) 1993-08-11
EP0555158B1 true EP0555158B1 (en) 1996-12-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420026A Expired - Lifetime EP0555158B1 (en) 1992-02-07 1993-01-21 Operating mechanism for a moulded case circuit breaker

Country Status (6)

Country Link
US (1) US5300907A (en)
EP (1) EP0555158B1 (en)
JP (1) JP3352743B2 (en)
DE (1) DE69306822T2 (en)
ES (1) ES2096894T3 (en)
FR (1) FR2687249B1 (en)

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Also Published As

Publication number Publication date
FR2687249A1 (en) 1993-08-13
US5300907A (en) 1994-04-05
DE69306822D1 (en) 1997-02-06
ES2096894T3 (en) 1997-03-16
JP3352743B2 (en) 2002-12-03
EP0555158A1 (en) 1993-08-11
FR2687249B1 (en) 1994-04-01
JPH0628961A (en) 1994-02-04
DE69306822T2 (en) 1997-05-28

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