EP0473619B1 - Switching mechanism for a line protective switch - Google Patents
Switching mechanism for a line protective switch Download PDFInfo
- Publication number
- EP0473619B1 EP0473619B1 EP90906912A EP90906912A EP0473619B1 EP 0473619 B1 EP0473619 B1 EP 0473619B1 EP 90906912 A EP90906912 A EP 90906912A EP 90906912 A EP90906912 A EP 90906912A EP 0473619 B1 EP0473619 B1 EP 0473619B1
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- EP
- European Patent Office
- Prior art keywords
- lever
- release
- switching mechanism
- trigger
- contact
- 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
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
- H01H71/7418—Adjusting both electrothermal and electromagnetic mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
- H01H71/7427—Adjusting only the electrothermal mechanism
- H01H2071/7454—Adjusting only the electrothermal mechanism with adjustable axis of transmission lever between bimetal element and trip lever
Definitions
- the invention relates to a switching mechanism for a circuit breaker in which a contact lever against the action of a spring can be brought into the closed position with a fixed contact piece and is held in this closed position with the support of the spring, by means of a hand-operated toggle spring-loaded in the switching-off direction and a pivotal lever pivoted thereon the contact lever is supported via a latching point on the latching lever, and with a pivotably mounted release lever acting on the latching point, which can be rotated by a magnetic trigger, with a release lever, pivotably mounted separately from the release lever, which in turn is arranged in a plane parallel to the pivoting plane of the release lever is, and with a rigidly arranged in the housing, designed as a bimetallic strip thermal release.
- Such a switching mechanism is known from DE-A-29 43 696.
- the contact lever and a separately mounted pawl together with a bracket serving as a latch lever form the latching point.
- the contact lever and the pawl are each clamped to one another by means of a spring in such a way that they enclose the bracket like a clamp and this can be supported on the two latching partners mentioned.
- the bracket held at the latching point pushes the contact lever into the closed position against the fixed contact piece.
- the pawl in turn has an approach on which the magnetic release works in the event of a short circuit.
- a self-switch is known (DE-A-35 15 297), in each of which a magnetic and thermal release element by means of individually adjustable transmission elements are operatively connected to a latching point of the switching mechanism.
- the transmission element for the thermal release element is an intermediate lever acted upon by a rigid, non-adjustable bimetallic strip, which in turn acts on a lever releasing the latching point.
- This lever can also be pivoted in the unlatching direction by the magnetic release element via a clutch lever and a bracket.
- the separate arrangement of the transmission elements in particular simplifies the setting of the bimetallic release. Ultimately, however, the movements of both release elements are transferred to a common release lever. With this arrangement, this also results in a mutual coupling of the triggering elements.
- DE-U-8 500 461 discloses a latching arrangement consisting of a contact lever and a latch lever, which has a release lever which acts directly on the latching point. This transmits the movements of the Release organs do not independently on the latching point, but the release movements influence each other.
- the mutual coupling of the triggering elements is also disadvantageous here.
- the invention has for its object to avoid the disadvantages of the known switch and to simplify the switching mechanism mentioned at the outset in such a way that the release movements controlled by the release elements are completely decoupled from one another and the thermal release can be optimally adapted to the release point independently of the magnetic release.
- the effect of the magnetic release path and the thermal release path on the unlatching point are completely separated from one another. Since there are also only a few parts, a high degree of shock and vibration resistance is achieved.
- the thermal release system is set, there is also no deformation of components, so that the entire system is relatively insensitive. Due to the small masses to be moved, the entire switching mechanism also shows an extremely fast switch-off behavior.
- the switching mechanism of a circuit breaker which is shown in the switched-off position and is shown schematically in the single drawing figure, has a pivotable manual control knob (1) to which a bow-shaped latch lever (2) is pivoted. With its angled free end (2a), this forms a latching surface which interacts with a latching lug (3a) of a preferably rigid contact lever (3).
- the contact lever is pivotally mounted on an axis (3c) by means of an elongated hole (3b) and is itself loaded in the direction of switching off by a tension spring (4) which engages between the elongated hole (3b) and the latching lug (3a).
- the contact lever works with its contact-side end (3d) on a fixed contact piece (5).
- the latch lever (2) loaded by a spring (2b) in the clockwise direction comes with its latching surface in front of the latching nose (3a) and then turn the contact lever around the axis (3c) clockwise against the force of the tension spring (4).
- the contact lever with its contact-side end (3d ') touches the fixed contact piece (5) in order to then lift off from the axis (3c) within the elongated hole (3b), so that the tension spring (4) now generates the contact pressure and tensions the switching mechanism.
- the elongated hole (3b) in the contact lever thus serves as a fulcrum, enables the dead center bracing of the knee joint formed from the manual control knob (1) and ratchet lever (2) and provides a sufficient burn-up reserve.
- thermal release (8) and a magnetic release (9) are arranged in the merely indicated housing (6) of the circuit breaker in series connection with the contact point (3d, 5).
- the thermal release for limiting the overcurrent is designed as a simple smooth bimetallic strip (8a) and with its base (8b) is preferably rigidly attached to a rear extension of an arc guide rail (10), which belongs to the extinguishing chamber (7) of the switch located below the contact point .
- a line (11a) also leads from the base point (8b) to a connecting terminal (11).
- the bimetallic strip which is not adjustable and is arranged approximately in the same direction as the contact lever, is connected to the contact lever (3) at its free end (8c), which changes position when exposed to heat, via a flexible line (8d) and engages with its free-standing end (8c) behind a release lever (12).
- This is designed as an angle lever and in turn is pivotally mounted on a bearing body (13) to be described in more detail.
- the unlatching lever (12) is preferably a stamped part, which is made electrically non-conductive by surface treatment, or a molded part made of a non-conductive material. With its lever arm (12a) the unlatching lever (12) engages under the angled end (2a) of the ratchet lever (2), the upper side of the lever arm having a curve shape adapted to the pivoting path of the contact lever (3). If a current flows through the thermal release, the bimetal strip (8a), which heats up due to the internal resistance, bends with its free end (8c) in the direction of the release lever (12) and engages behind it Lever arm (12b).
- the unlatching lever is pivoted clockwise so far that the end (2a) of the pawl lever is raised by the lever arm (12a) and the latch is released. Under the action of the tension spring (4), the contact lever (3) then pivots in the direction of switching off.
- the magnetic release (9), which is also located in the current path to a further connection terminal, not shown, via the fixed contact piece (5) is essentially formed by a release coil (9a) surrounded by a return iron with a plunger armature (9b) guided therein.
- the latter works with its end designed as a plunger on a release lever (14) which is arranged pivotably about an axis (14c) fixed to the housing on the side of the contact lever opposite the unlatching lever (12).
- the angular release lever also engages with its lever arm (14a) under the angled end (2a) of the ratchet lever (2) in a plane parallel to the lever arm (12a).
- the top of the lever arm (14a) is provided with a curved cam track and is thus optimally adapted to the movement of the ratchet lever (2) when the mechanism is switched on, while the other lever arm (14b) of the release lever is hammer-shaped.
- the plunger armature (9b) which snaps forward in the direction of the lever arm (14b) in the event of a short-circuit current, pivots the release lever counterclockwise in such a way that it releases the latch (2a, 3a) and then accelerates the contact lever, accelerated by the hammer head, into the open position shown, the Tension spring (4) is also effective as an opening spring.
- the movement of the magnetic release (9) is thus transmitted to the latching point via the release lever (14) completely independently of the unlatching movement of the thermal release (8).
- the curved upper sides of the lever arms (12a or 14a) can also be optimally adapted to the sequence of movements of the ratchet lever (2) during the switching-on process, in order also in the event of a fault, i. H. in the event of an overload or short circuit, unlatch early before the contact lever reaches its usual over-dead center position.
- the unlatching lever (12) By turning the bearing body, which is kept stiff in the housing, the unlatching lever (12) can be moved due to the eccentricity of its bearing point in such a way that the given one overload current and the resulting curvature of the bimetallic strip (8a) the release via the release lever (12) is released precisely and the switching mechanism automatically interrupts the flow of current at the contact point.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
- Thermally Actuated Switches (AREA)
Abstract
Description
Die Erfindung betrifft einen Schaltmechanismus für einen Leitungsschutzschalter, bei dem mittels eines in Ausschaltrichtung federbelasteten Handbedienungsknebels und eines an diesem schwenkbar angelenkten Klinkenhebels ein Kontakthebel gegen die Wirkung einer Feder in Schließstellung mit einem festen Kontaktstück bringbar und in dieser Schließstellung mit Unterstützung der Feder gehalten ist, wobei der Kontakthebel über eine Verklinkungsstelle am Klinkenhebel abgestützt ist, sowie mit einem auf die Verklinkungsstelle einwirkenden, schwenkbar gelagerten Auslösehebel, der von einem magnetischen Auslöser verdrehbar ist, mit einem vom Auslösehebel getrennt schwenkbar gelagerten Entklinkungshebel, der seinerseits in einer zur Schwenkebene des Auslösehebels parallelen Ebene angeordnet ist, und mit einem starr im Gehäuse angeordneten, als Bimetallstreifen ausgeführten thermischen Auslöser.The invention relates to a switching mechanism for a circuit breaker in which a contact lever against the action of a spring can be brought into the closed position with a fixed contact piece and is held in this closed position with the support of the spring, by means of a hand-operated toggle spring-loaded in the switching-off direction and a pivotal lever pivoted thereon the contact lever is supported via a latching point on the latching lever, and with a pivotably mounted release lever acting on the latching point, which can be rotated by a magnetic trigger, with a release lever, pivotably mounted separately from the release lever, which in turn is arranged in a plane parallel to the pivoting plane of the release lever is, and with a rigidly arranged in the housing, designed as a bimetallic strip thermal release.
Ein solcher Schaltmechanismus ist aus der DE-A- 29 43 696 bekannt. Hierbei bilden der Kontakthebel und eine separat gelagerte Schaltklinke gemeinsam mit einem als Klinkenhebel dienenden Bügel die Verklinkungsstelle. über jeweils eine Feder sind der Kontakthebel und die Schaltklinke derart gegenseitig verspannt, daß sie den Bügel klammerartig umfassen und dieser sich an den beiden genannten Verklinkungspartnern abstützen kann. Bei einer Schwenkbewegung am Handbedienungsknebel schiebt der so an der Verklinkungsstelle gehaltene Bügel den Kontakthebel in die Schließstellung gegen das Festkontaktstück. Die Schaltklinke ihrerseits hat einen Ansatz, auf den der magnetische Auslöser im Kurzschlußfall arbeitet. Dabei verschwenkt die Schaltklinke und gibt an der Verklinkungsstelle die Umklammerung des Bügels frei, so daß der Kontakthebel in die Ausschaltrichtung schwenken kann. Des weiteren greift an der Schaltklinke ein Kupplungshebel an, der vom thermischen Auslöser bei überstrom verdreht wird. Auch in diesem Falle wird so letztlich die Schaltklinke verschwenkt, so daß der Bügel freigegeben wird und der Kontakthebel abschalten kann. Von Nachteil bei diesem Schaltmechanismus sind die drei an der Verklinkungsstelle beteiligten Verklinkungspartner mit einer ungünstigen Kraftangriffsrichtung des Bügels. Hinzu kommt ein erheblicher Einfluß der beiden Federn auf die Verklinkungskraft. Die durch Zwischenglieder auf die Schaltklinke übertragenen Auslösebewegungen sind zwar bedingt entkoppelt, wirken aber letztlich auf die Schaltklinke und führen zu einer ungünstigen Massenanhäufung und einer dadurch bedingten größeren Stoß- und Rüttelempfindlichkeit des Schalters.Such a switching mechanism is known from DE-A-29 43 696. Here, the contact lever and a separately mounted pawl together with a bracket serving as a latch lever form the latching point. The contact lever and the pawl are each clamped to one another by means of a spring in such a way that they enclose the bracket like a clamp and this can be supported on the two latching partners mentioned. During a swiveling movement on the hand control toggle, the bracket held at the latching point pushes the contact lever into the closed position against the fixed contact piece. The pawl in turn has an approach on which the magnetic release works in the event of a short circuit. The pawl pivots and releases the clasping of the bracket at the latching point, so that the contact lever can pivot in the switch-off direction. Furthermore, a clutch lever acts on the pawl, which is turned by the thermal release in the event of overcurrent. In this case, too, the pawl is ultimately pivoted so that the bracket is released and the contact lever can switch off. A disadvantage of this switching mechanism are the three latching partners involved in the latching point with an unfavorable force application direction of the bracket. In addition, the two springs have a considerable influence on the latching force. The tripping movements transmitted to the pawl by intermediate elements are uncoupled to a certain extent, but ultimately act on the pawl and lead to an unfavorable mass accumulation and a resulting greater sensitivity to shock and vibration of the switch.
Weiterhin ist ein Selbstschalter bekannt (DE-A- 35 15 297), bei dem je ein magnetisches und thermisches Auslöseorgan mittels einzeln einstellbarer übertragungsglieder in Wirkverbindung mit einer Verklinkungsstelle der Schaltmechanik befindlich sind. Das übertragungsglied für das thermische Auslöseorgan ist ein von einem starren, nicht justierbaren Bimetallstreifen beaufschlagter Zwischenhebel, der seinerseits auf einen die Verklinkungsstelle lösenden Hebel einwirkt. Dieser Hebel ist auch vom magnetischen Auslöseorgan über einen Kupplungshebel und einen Bügel in Entklinkungsrichtung verschwenkbar. Durch die getrennte Anordnung der übertragungsglieder ist besonders die Einstellung des Bimetallauslösers vereinfacht. Letztlich werden jedoch die Bewegungen beider Auslöseorgane auf einen gemeinsamen Auslösehebel übertragen. Damit ergibt sich auch bei dieser Anordnung eine gegenseitige Kopplung der Auslöseorgane.Furthermore, a self-switch is known (DE-A-35 15 297), in each of which a magnetic and thermal release element by means of individually adjustable transmission elements are operatively connected to a latching point of the switching mechanism. The transmission element for the thermal release element is an intermediate lever acted upon by a rigid, non-adjustable bimetallic strip, which in turn acts on a lever releasing the latching point. This lever can also be pivoted in the unlatching direction by the magnetic release element via a clutch lever and a bracket. The separate arrangement of the transmission elements in particular simplifies the setting of the bimetallic release. Ultimately, however, the movements of both release elements are transferred to a common release lever. With this arrangement, this also results in a mutual coupling of the triggering elements.
Des weiteren ist in DE-U-8 500 461 eine aus einem Kontakthebel und einem Klinkenhebel bestehende Verklinkungsanordnung offenbart, die einen direkt auf die Verklinkungsstelle einwirkenden Auslösehebel aufweist. Dieser überträgt die Bewegungen der Auslöseorgane nicht unabhängig voneinander auf die Verklinkungsstelle, sondern die Auslösebewegungen beeinflussen sich gegenseitig. Von Nachteil ist also auch hier die gegenseitige Kopplung der Auslöseorgane.Furthermore, DE-U-8 500 461 discloses a latching arrangement consisting of a contact lever and a latch lever, which has a release lever which acts directly on the latching point. This transmits the movements of the Release organs do not independently on the latching point, but the release movements influence each other. The mutual coupling of the triggering elements is also disadvantageous here.
Der Erfindung liegt die Aufgabe zugrunde, die Nachteile der bekannten Schalter zu vermeiden und den eingangs erwähnten Schaltmechanismus derart zu vereinfachen, daß die von den Auslöseorganen gesteuerten Entklinkungsbewegungen vollständig voneinander entkoppelt sind und der thermische Auslöser sich unabhängig vom magnetischen Auslöser optimal an die Verklinkungsstelle anpassen läßt.The invention has for its object to avoid the disadvantages of the known switch and to simplify the switching mechanism mentioned at the outset in such a way that the release movements controlled by the release elements are completely decoupled from one another and the thermal release can be optimally adapted to the release point independently of the magnetic release.
Diese Aufgabe wird durch einen Schaltmechanismus mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindung sind Gegenstände der Unteransprüche.This object is achieved by a switching mechanism with the characterizing features of claim 1. Developments and advantageous embodiments of the invention are the subject of the dependent claims.
Bei dem erfindungsgemäßen Schaltmechanismus sind in vorteilhafter Weise der magnetische Auslöseweg und der thermische Auslöseweg in ihrer Wirkung auf die Entklinkungsstelle vollständig voneinander getrennt. Da außerdem nur wenige Teile vorhanden sind, wird eine hohe Schock- und Rüttelsicherheit erzielt. Bei der Einstellung des thermischen Auslösesystems tritt zudem keine Verformung von Bauteilen auf, so daß das ganze System relativ unempfindlich ist. Aufgrund geringer zu bewegender Massen zeigt der gesamte Schaltmechanismus überdies ein äußerst schnelles Abschaltverhalten.In the switching mechanism according to the invention, the effect of the magnetic release path and the thermal release path on the unlatching point are completely separated from one another. Since there are also only a few parts, a high degree of shock and vibration resistance is achieved. When the thermal release system is set, there is also no deformation of components, so that the entire system is relatively insensitive. Due to the small masses to be moved, the entire switching mechanism also shows an extremely fast switch-off behavior.
Anhand der Zeichnung ist die Erfindung an einem Ausführungsbeispiel nachstehend näher erläutert.The invention is explained in more detail below using an exemplary embodiment with reference to the drawing.
Der in der einzigen Zeichnungsfigur schematisch gezeigte, in Ausschaltstellung befindliche Schaltmechanismus eines Leitungsschutzschalters hat einen schwenkbaren Handbedienungsknebel (1), an dem ein bügelförmiger Klinkenhebel (2) drehbar angelenkt ist. Dieser bildet mit seinem abgewinkelten freien Ende (2a) eine Verklinkungsfläche, die mit einer Verklinkungsnase (3a) eines vorzugsweise starren Kontakthebels (3) zusammenwirkt. Mittels eines Langloches (3b) ist der Kontakthebel schwenkbar auf einer Achse (3c) gelagert und wird seinerseits in Ausschaltrichtung von einer Zugfeder (4) belastet, die zwischen Langloch (3b) und Verklinkungsnase (3a) angreift. Am gegenüberliegenden Hebelarm arbeitet der Kontakthebel mit seinem kontaktseitigen Ende (3d) auf ein Festkontaktstück (5).The switching mechanism of a circuit breaker, which is shown in the switched-off position and is shown schematically in the single drawing figure, has a pivotable manual control knob (1) to which a bow-shaped latch lever (2) is pivoted. With its angled free end (2a), this forms a latching surface which interacts with a latching lug (3a) of a preferably rigid contact lever (3). The contact lever is pivotally mounted on an axis (3c) by means of an elongated hole (3b) and is itself loaded in the direction of switching off by a tension spring (4) which engages between the elongated hole (3b) and the latching lug (3a). On the opposite lever arm, the contact lever works with its contact-side end (3d) on a fixed contact piece (5).
Wird der Handbedienungsknebel (1) im Gegenuhrzeigersinn in die in Strich-Punkt-Linien angedeutete Lage (1') gekippt, so kommt der über eine Feder (2b) im Uhrzeigersinn belastete Klinkenhebel (2) mit seiner Verklinkungsfläche vor die Verklinkungsnase (3a) zu liegen und dreht anschließend den Kontakthebel um die Achse (3c) im Uhrzeigersinn entgegen der Kraft der Zugfeder (4). Dabei berührt der Kontakthebel mit seinem kontaktseitigen Ende (3d') das Festkontaktstück (5), um danach innerhalb des Langloches (3b) von der Achse (3c) abzuheben, so daß die Zugfeder (4) jetzt den Kontaktdruck erzeugt und den Schaltmechanismus verspannt. Das Langloch (3b) im Kontakthebel dient somit als Drehpunkt, ermöglicht die übertotpunkt-Verspannung des aus Handbedienungsknebel (1) und Klinkenhebel (2) gebildeten Kniegelenkes und stellt eine ausreichende Abbrandreserve zur Verfügung.If the manual control knob (1) is tilted counterclockwise into the position (1 ') indicated by dash-dot lines, the latch lever (2) loaded by a spring (2b) in the clockwise direction comes with its latching surface in front of the latching nose (3a) and then turn the contact lever around the axis (3c) clockwise against the force of the tension spring (4). The contact lever with its contact-side end (3d ') touches the fixed contact piece (5) in order to then lift off from the axis (3c) within the elongated hole (3b), so that the tension spring (4) now generates the contact pressure and tensions the switching mechanism. The elongated hole (3b) in the contact lever thus serves as a fulcrum, enables the dead center bracing of the knee joint formed from the manual control knob (1) and ratchet lever (2) and provides a sufficient burn-up reserve.
Des weiteren sind im lediglich angedeuteten Gehäuse (6) des Leitungsschutzschalters in Reihenschaltung mit der Kontaktstelle (3d, 5) ein thermischer Auslöser (8) und ein magnetischer Auslöser (9) angeordnet. Der thermische Auslöser zur Begrenzung des überstromes ist als einfacher glatter Bimetallstreifen (8a) ausgebildet und mit seinem Fußpunkt (8b) vorzugsweise an einer rückwärtigen Verlängerung einer Lichtbogenleitschiene (10), die zur unterhalb der Kontaktstelle befindlichen Löschkammer (7) des Schalters gehört, starr befestigt. Vom Fußpunkt (8b) führt auch eine Leitung (11a) zu einer Anschlußklemme (11). Der nicht justierbare, etwa im gleichen Richtungssinn wie der Kontakthebel angeordnete Bimetallstreifen ist an seinem bei Wärmeeinfluß lageveränderlichen freien Ende (8c) über eine flexible Leitung (8d) mit dem Kontakthebel (3) verbunden und greift mit seinem freistehenden Ende (8c) hinter einen Entklinkungshebel (12). Dieser ist als Winkelhebel ausgebildet und seinerseits auf einem noch näher zu beschreibenden Lagerkörper (13) schwenkbar gelagert.Furthermore, a thermal release (8) and a magnetic release (9) are arranged in the merely indicated housing (6) of the circuit breaker in series connection with the contact point (3d, 5). The thermal release for limiting the overcurrent is designed as a simple smooth bimetallic strip (8a) and with its base (8b) is preferably rigidly attached to a rear extension of an arc guide rail (10), which belongs to the extinguishing chamber (7) of the switch located below the contact point . A line (11a) also leads from the base point (8b) to a connecting terminal (11). The bimetallic strip, which is not adjustable and is arranged approximately in the same direction as the contact lever, is connected to the contact lever (3) at its free end (8c), which changes position when exposed to heat, via a flexible line (8d) and engages with its free-standing end (8c) behind a release lever (12). This is designed as an angle lever and in turn is pivotally mounted on a bearing body (13) to be described in more detail.
Der Entklinkungshebel (12) ist vorzugsweise ein Stanzteil, welches durch Oberflächenbehandlung elektrisch nichtleitend ausgebildet ist, oder ein Formteil aus einem nichtleitenden Werkstoff. Mit seinem Hebelarm (12a) greift der Entklinkungshebel (12) unter das abgewinkelte Ende (2a) des Klinkenhebels (2), wobei die Oberseite des Hebelarmes eine an den Schwenkweg des Kontakthebels (3) angepaßte Kurvenform aufweist. Fließt ein Strom durch den thermischen Auslöser, so krümmt sich der aufgrund des Innenwiderstandes sich erwärmende Bimetallstreifen (8a) mit seinem freien Ende (8c) in Richtung des Entklinkungshebels (12) und greift hinter dessen Hebelarm (12b). Kommt es zur weiteren Erwärmung des Bimetallstreifens durch einen unzulässigen überstrom, dann wird der Entklinkungshebel so weit im Uhrzeigersinn verschwenkt, daß das Ende (2a) des Klinkenhebels vom Hebelarm (12a) angehoben und die Verklinkung gelöst wird. Unter der Wirkung der Zugfeder (4) verschwenkt der Kontakthebel (3) sodann in Ausschaltrichtung.The unlatching lever (12) is preferably a stamped part, which is made electrically non-conductive by surface treatment, or a molded part made of a non-conductive material. With its lever arm (12a) the unlatching lever (12) engages under the angled end (2a) of the ratchet lever (2), the upper side of the lever arm having a curve shape adapted to the pivoting path of the contact lever (3). If a current flows through the thermal release, the bimetal strip (8a), which heats up due to the internal resistance, bends with its free end (8c) in the direction of the release lever (12) and engages behind it Lever arm (12b). If there is further heating of the bimetal strip due to an impermissible overcurrent, the unlatching lever is pivoted clockwise so far that the end (2a) of the pawl lever is raised by the lever arm (12a) and the latch is released. Under the action of the tension spring (4), the contact lever (3) then pivots in the direction of switching off.
Der über das Festkontaktstück (5) ebenfalls im Strompfad zu einer nicht gezeigten weiteren Anschlußklemme liegende magnetische Auslöser (9) ist im wesentlichen durch eine von einem Rückschlußeisen umgebene Auslösespule (9a) mit darin geführtem Tauchanker (9b) gebildet. Letzterer arbeitet mit seinem als Stößel ausgebildeten Ende auf einen Auslösehebel (14), der um eine gehäusefeste Achse (14c) schwenkbar an der dem Entklinkungshebel (12) gegenüberliegenden Seite des Kontakthebels angeordnet ist. Der winkelförmige Auslösehebel greift mit seinem Hebelarm (14a) ebenfalls unter das abgewinkelte Ende (2a) des Klinkenhebels (2) in einer zum Hebelarm (12a) parallelen Ebene. Die Oberseite des Hebelarmes (14a) ist mit einer geschwungenen Kurvenbahn versehen und somit an den Bewegungsablauf des Klinkenhebels (2) beim Einschalten des Mechanismus optimal.angepaßt, während der andere Hebelarm (14b) des Auslösehebels hammerförmig ausgebildet ist. Der bei einem Kurzschlußstrom in Richtung des Hebelarmes (14b) vorschnellende Tauchanker (9b) schwenkt den Auslösehebel im Gegenuhrzeigersinn derart, daß dieser die Verklinkung (2a, 3a) löst und anschließend den Kontakthebel,vom Hammerkopf beschleunigt, in die gezeigte Offenstellung treibt, wobei die Zugfeder (4) zusätzlich als öffnungsfeder wirksam ist. Die Bewegung des Magnetauslösers (9) wird über den Auslösehebel (14) somit vollkommen unabhängig von der Entklinkungsbewegung des thermischen Auslösers (8) auf die Verklinkungsstelle übertragen.The magnetic release (9), which is also located in the current path to a further connection terminal, not shown, via the fixed contact piece (5) is essentially formed by a release coil (9a) surrounded by a return iron with a plunger armature (9b) guided therein. The latter works with its end designed as a plunger on a release lever (14) which is arranged pivotably about an axis (14c) fixed to the housing on the side of the contact lever opposite the unlatching lever (12). The angular release lever also engages with its lever arm (14a) under the angled end (2a) of the ratchet lever (2) in a plane parallel to the lever arm (12a). The top of the lever arm (14a) is provided with a curved cam track and is thus optimally adapted to the movement of the ratchet lever (2) when the mechanism is switched on, while the other lever arm (14b) of the release lever is hammer-shaped. The plunger armature (9b), which snaps forward in the direction of the lever arm (14b) in the event of a short-circuit current, pivots the release lever counterclockwise in such a way that it releases the latch (2a, 3a) and then accelerates the contact lever, accelerated by the hammer head, into the open position shown, the Tension spring (4) is also effective as an opening spring. The movement of the magnetic release (9) is thus transmitted to the latching point via the release lever (14) completely independently of the unlatching movement of the thermal release (8).
Die unabhängig voneinander jeweils an zwei verschiedenen Seiten des Kontakthebels (3) im Gehäuse gelagerten Hebel (12 bzw. 14) übergreifen mit ihren Hebelarmen (12a bzw. 14a) den Kontakthebel im Bereich der Verklinkungsstelle 2a, 3a) derart, daß der Hebelarm (12a) des Entklinkungshebels unter und der Hebelarm (14a) des Auslösehebels über dem vorzugsweise als Flachteil ausgebildeten Kontakthebel zu liegen kommt. Dadurch ergeben sich für den an der Verklinkungsnase (3a) abgestützten Klinkenhebel (2) etwagleiche Entklinkungsbedingungen und ein Verkanten des abgewinkelten Endes (2a) ist praktisch ausgeschlossen. Auch lassen sich die kurvenförmigen Oberseiten der Hebelarme (12a bzw. 14a) optimal an den Bewegungsablauf des Klinkenhebels (2) während des Einschaltvorganges anpassen, um auch im Fehlerfall, d. h. bei überlast bzw. Kurzschluß , frühzeitig eine Entklinkung herbeizuführen, noch bevor der Kontakthebel seine übliche in Übertotpunktlage verspannte Position erreicht.The levers (12 and 14), which are mounted independently of each other on two different sides of the contact lever (3) in the housing, overlap with their lever arms (12a or 14a) the contact lever in the area of the
Eine Justierung des Schaltmechanismus ist nur hinsichtlich des thermischen Auslösers (8) erforderlich, da der magnetische Auslöser (9) sowie der Auslösehebel (14) im Rahmen der Herstellungstoleranzen ausreichend genau auf die Auslösebedingungen abgestimmt werden können. Wie eingangs beschrieben, ist der Bimetallstreifen (8a) an seinem Fußpunkt (8b) fest angeordnet und hat selbst keine Justiermöglichkeit. Die Justierung des thermischen Auslösers erfolgt vielmehr in besonderer Weise durch relative Lageveränderung des Entklinkungshebels (12), der mit seiner Lagerbohrung (12c) auf einem seinerseits exzentrisch auf dem bereits erwähnten Lagerkörper (13) angeordneten Zapfen (13a) gelagert ist. Der zylindrische Lagerkörper ist wiederum beim fertigen Schalter in nicht näher dargestellter Weise von außerhalb des Gehäuses einstellbar. Durch Drehen des im Gehäuse schwergängig gehaltenen Lagerkörpers läßt sich daher der Entklinkungshebel (12) aufgrund der Exzentrizität seiner Lagerstelle so verschieben, daß beim vorgegebenen überlaststrom und der dadurch hervorgerufenen Krümmung des Bimetallstreifens (8a) die Verklinkung über den Entklinkungshebel (12) auslösegenau aufgehoben wird und der Schaltmechanismus selbsttätig den Stromfluß an der Kontaktstelle unterbricht.An adjustment of the switching mechanism is only necessary with regard to the thermal release (8), since the magnetic release (9) and the release lever (14) can be matched sufficiently precisely to the release conditions within the scope of the manufacturing tolerances. As described at the beginning, the bimetallic strip (8a) is fixed at its base (8b) and itself has no possibility of adjustment. Rather, the thermal release is adjusted in a special way by changing the relative position of the unlatching lever (12), which is mounted with its bearing bore (12c) on a pin (13a) arranged eccentrically on the already mentioned bearing body (13). The cylindrical bearing body can in turn be adjusted from outside the housing in a manner not shown in the finished switch. By turning the bearing body, which is kept stiff in the housing, the unlatching lever (12) can be moved due to the eccentricity of its bearing point in such a way that the given one overload current and the resulting curvature of the bimetallic strip (8a) the release via the release lever (12) is released precisely and the switching mechanism automatically interrupts the flow of current at the contact point.
Claims (10)
- Switching mechanism for a line protection switch, in which a contact lever ( 3) can be brought into closed setting with a fixed contact (5) against the action of a spring (4) by means of a manual operating toggle (1) spring-loaded in switching-off direction and a ratchet lever (2) pivotably articulated to the toggle and is kept in this closed setting with assistance of the spring (4), wherein the contact lever (3) is supported at the ratchet lever (2) by way of a latching place (2a, 3a), as well as with a pivotably mounted trigger lever (14) which acts on the latching place (2a, 3a) and which is rotatable by a magnetic trigger (9), with a release lever (12), which is pivotably mounted separately from the trigger lever (14) and which in turn is arranged in a plane parallel to the plane of pivotation of the trigger lever (14), and with a thermal trigger (8) rigidly arranged in the housing (6) and constructed as a bimetallic strip (8a), characterised thereby that the latching place (2a, 3a) is formed solely between the ratchet lever (2) articulated to the manual operating toggle (1) and the contact lever (3) supported by this toggle, that the trigger lever (14) and the release lever (12) act directly on the ratchet lever (2), wherein the release lever (12) is acted by the non-adjustably constructed bimetallic strip (8a) in the presence of excess current, and that the release is effected mutually independently by the trigger lever (14) or by the release lever (12).
- Switching mechanism according to claim 1, characterised thereby that the release lever (12) is an angle lever, the fulcrum (12c) of which is arranged on an adjustable bearing pin (13a).
- Switching mechanism according to claim 2, characterised thereby that the bearing pin (13a) of the release lever (12) is disposed eccentrically on a bearing body (13) rotatably arranged in the housing (6).
- Switching mechanism according to one of claims 1 to 3, characterised thereby that the trigger lever (14) and the release lever (12) are respectively arranged at mutually opposite sides of the preferably rigid contact lever (3), which comprises a latching nose (3a).
- Switching mechanism according to one of claims 1 to 4, characterised thereby that the release lever (12) is directly acted on in release direction at its one lever arm (12b) by the free end (8c) of the bimetallic strip (8a).
- Switching mechanism according to one of claims 1 to 5, characterised thereby that the release lever (12) engages by its other, bent over lever arm (12a) under a bent over end (2a) of the ratchet lever (2) and is pivotable in clockwise sense in the case of a triggering process.
- Switching mechanism according to one of claims 1 to 4, characterised thereby that the trigger lever (14) engages by a bent over free lever arm (14a) under a bent over end (2a) of the ratchet lever (2) and is pivotable in counter-clockwise sense in the case of a triggering process.
- Switching mechanism according to one of claims 1 to 7, characterised thereby that the lever arms (12a and 14a), which engage at the ratchet lever (2), of the trigger lever (14) and the release lever (12) are arranged overlapping, in opposite sense, above the contact lever fulcrum (3b, 3c) and respectively at mutually opposite wide sides of the contact lever (3).
- Switching mechanism according to one of claims 1 to 8, characterised thereby that the release lever (12) is a metallic stamped part, which is constructed to be electrically non-conductive by subsequent surface treatment.
- Switching mechanism according to one of claims 1 to 8, characterised thereby that the release lever (12) is a moulded part of an electrically non-conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90906912T ATE93343T1 (en) | 1989-05-27 | 1990-05-18 | SWITCHING MECHANISM FOR A CIRCUIT BREAKER. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3917326 | 1989-05-27 | ||
| DE3917326A DE3917326A1 (en) | 1989-05-27 | 1989-05-27 | SWITCHING MECHANISM FOR A CIRCUIT BREAKER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0473619A1 EP0473619A1 (en) | 1992-03-11 |
| EP0473619B1 true EP0473619B1 (en) | 1993-08-18 |
Family
ID=6381536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90906912A Expired - Lifetime EP0473619B1 (en) | 1989-05-27 | 1990-05-18 | Switching mechanism for a line protective switch |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0473619B1 (en) |
| DE (2) | DE3917326A1 (en) |
| ES (1) | ES2044582T3 (en) |
| WO (1) | WO1990015431A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4313207A1 (en) * | 1993-04-22 | 1994-10-27 | Kopp Heinrich Ag | Miniature circuit breaker |
| ES2147158B1 (en) * | 1998-12-30 | 2001-03-01 | Power Controls Iberica Sl | IMPROVEMENTS IN AUTOMATIC GROUND EXHAUST CIRCUITS. |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067514B (en) * | 1955-10-15 | 1959-10-22 | Calor Emag Elektrizitaets Ag | Trip device for multi-pole circuit breakers |
| FR2344949A1 (en) * | 1976-03-15 | 1977-10-14 | Merlin Gerin | Low voltage miniature contact breaker for domestic use - has bimetal strips and solenoid for release and laminated stack for arc blowout |
| DE2938858C2 (en) * | 1979-09-26 | 1983-10-13 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Switching mechanism for a circuit breaker |
| DE2943696C2 (en) * | 1979-10-30 | 1982-06-24 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Switching mechanism for circuit breakers |
| DE8500461U1 (en) * | 1985-01-10 | 1986-02-06 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Latch arrangement of a circuit breaker |
| DE3515297A1 (en) * | 1985-04-27 | 1986-11-06 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Automatic switch with a magnetic and thermal trip device |
-
1989
- 1989-05-27 DE DE3917326A patent/DE3917326A1/en not_active Withdrawn
-
1990
- 1990-05-18 DE DE9090906912T patent/DE59002402D1/en not_active Expired - Fee Related
- 1990-05-18 EP EP90906912A patent/EP0473619B1/en not_active Expired - Lifetime
- 1990-05-18 ES ES90906912T patent/ES2044582T3/en not_active Expired - Lifetime
- 1990-05-18 WO PCT/DE1990/000374 patent/WO1990015431A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| EP0473619A1 (en) | 1992-03-11 |
| DE59002402D1 (en) | 1993-09-23 |
| WO1990015431A1 (en) | 1990-12-13 |
| DE3917326A1 (en) | 1990-11-29 |
| ES2044582T3 (en) | 1994-01-01 |
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