EP0473619A1 - Switching mechanism for a line protective switch. - Google Patents

Switching mechanism for a line protective switch.

Info

Publication number
EP0473619A1
EP0473619A1 EP90906912A EP90906912A EP0473619A1 EP 0473619 A1 EP0473619 A1 EP 0473619A1 EP 90906912 A EP90906912 A EP 90906912A EP 90906912 A EP90906912 A EP 90906912A EP 0473619 A1 EP0473619 A1 EP 0473619A1
Authority
EP
European Patent Office
Prior art keywords
lever
switching mechanism
contact
release
point
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
EP90906912A
Other languages
German (de)
French (fr)
Other versions
EP0473619B1 (en
Inventor
Dieter Kropp
Gerhard Scholz
Guenter Boeker
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to AT90906912T priority Critical patent/ATE93343T1/en
Publication of EP0473619A1 publication Critical patent/EP0473619A1/en
Application granted granted Critical
Publication of EP0473619B1 publication Critical patent/EP0473619B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7418—Adjusting both electrothermal and electromagnetic mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—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
    • 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 the middle of a spring-loaded manual operating lever Ls and a pivotally hinged latch lever via a latching lever L le, which is in contact with one another under the action of a contact spring located contact lever carrying the latching point can be brought into a fixed Lung with a fixed contact piece, the contact lever being supported on the latching point and on the fixed contact piece and being held by the contact spring, and having a pivotably mounted release lever L acting on the latching point , which can be rotated by magnetic and / or thermal triggers.
  • Such a switching mechanism is known from DE 29 38 858 C2.
  • the release lever which can be pivoted by a magnetic release device and by a bimetal, acts with a lever arm on the angled extension of the ratchet lever, while on its other lever arm the release members act directly or via an intermediate slide.
  • another lever arm of the release lever l protrudes into the swivel range of the contact lever L carrying the link.
  • both the magnetic and thermal release element act in the same direction on the release lever that releases the latching point.
  • the bimetallic release is subject to a different movement sequence than the magnetic release in the event of an overload, the two different movements can hardly be optimally matched to the required path of the switch.
  • a self-switch is known (DE 35 15 297 A1), in which a magnetic and thermal tripping element by means of individually adjustable transmission elements are operatively connected to a latching point of the switch mechanism.
  • the transmission link for the thermal release element is an intermediate lever acted upon by a bi-meta L Ist tire, which in turn acts on a lever releasing the latching point.
  • This lever can also be pivoted from the magnetic release element via a clutch lever and a bracket in the unlocking direction.
  • the separate arrangement of the transmission elements simplifies the setting of the bimetallic release, but ultimately the movements of both release elements are transmitted to a common release lever. This also results in a mutual coupling of the release elements in this arrangement.
  • the invention has for its object to avoid the Häei le of the known switches and to simplify the switching mechanism mentioned at the outset in such a way that those controlled by the triggering elements
  • Unlatching movements are completely decoupled from one another and the thermal release can be optimally adapted to the latching point independently of the magnetic release.
  • the action of the magnetic release path and the thermal release path are completely separated from each other in their effect on the unlatching point. Since there are also only a few parts, a high level of shock and vibration resistance is achieved. When hiring the thermal release system also does not cause deformation of components, so that the whole system is relatively insensitive. Due to the small masses to be moved, the entire switching mechanism also shows extremely fast switch-off behavior.
  • the switching mechanism of a circuit protection circuit shown schematically in the switched-off position 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 nose (3a) of a preferably rigid contact lever (3).
  • the contact lever is pivotably mounted on an axis (3c) by means of an elongated hole (3b) and is itself loaded by a contact spring (4) which engages between the elongated hole (3b) and the latching lug (3a).
  • the contact lever works with its contact end (3d) on a fixed contact piece (5).
  • the latch lever (2) loaded by a spring (2b) clockwise comes with its latching surface in front of the latching nose (3a) to lie and then turns the contact lever around the axis (3c) clockwise against the force of the contact spring (4).
  • the contact lever with its contact end (3d ') touches the fixed contact piece (5) in order to then lift off within the slot (3b) from the axis (3c) so that the contact spring (4) now generates the contact pressure and clamped 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 the 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 bi meta 11strei fen (8a) and with its base (8b) preferably on a rear extension of an arc guide rail (10) which belongs to the quenching chamber (7) of the switch located below the contact point , rigidly attached.
  • a line (11a) also leads from the base point (8b) to a connecting terminal (11).
  • the bimetallic strip which cannot be adjusted, is arranged approximately in the same direction as the contact lever, and is connected at its free end (8c), which is variable with the influence of heat, via a flexible line (8d) to the contact lever (3) and engages behind with its free-standing end (8c) 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 latching point is released. Under the action of the contact spring (4), the contact lever (3) then pivots in the disengaging direction.
  • magnetic trigger (9) is essentially formed by a release coil (9a) surrounded by a back iron with a plunger (9b) guided therein.
  • the latter works with its end designed as a plunger on a release lever (14) which is pivotable about a housing-fixed axis (14c) on the side of the contact lever L s opposite the release lever (12).
  • the lever-shaped trigger lever (14a) also engages under the angled end (2a) of the latch 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 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 designed to be hammer-shaped.
  • the plunger armature (9b) which snaps 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 latching point (2a, 3a) and then accelerates the contact lever from the hammer head into the open position shown, the contact 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 movement of the thermal release (8).
  • Characterized occur to those supported on the Verklinkungsnase (3a) of ratchet levers (2) about ⁇ same DESCAL li nkungsbedi ngungen and tilting of the angled end (2a) is practically excluded.
  • the curved tops of the lever arms (12a or 14a) can also be optimally adapted to the movement of the ratchet lever (2) during the switch-on process, so that even in the event of a fault, i.e. there is an overload or a short circuit, unlatching can be achieved at an early stage , before the contact lever reaches its usual over-dead center position.
  • the thermal release (8) 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.
  • the bimetallic strip (8a) is firmly arranged at its base (8b) and has itself made no adjustment possible. Rather, the thermal release is adjusted in a special way by changing the relative position of the decalcifying 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 is in turn adjustable from outside the housing in the finished switch in a manner not shown.
  • 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 Over loadst rom and the curvature of the bimetallic strip (8a) caused by this, the latching via the unlatching lever (12) is released precisely and the switching mechanism automatically interrupts the current flow at the contact point.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

Les disjoncteurs de protection présentent un point d'interruption de contact qui est encliqueté le plus souvent par l'intermédiaire d'un mécanisme à genouillère. Si un courant d'intensité anormalement élevé circule, le point d'encliquetage est désaccouplé au moyen d'un interrupteur thermique ou magnétique, de sorte que le courant est interrompu. Pour le mécanisme de commutation, les mouvements de déclenchement des deux interrupteurs doivent être transmis au point d'encliquetage, par l'intermédiaire de moyens aussi simples que possible, entièrement désaccouplés les uns des autres. A cet effet, un levier de déclenchement (14) sollicité par un interrupteur magnétique (9) et un levier de décliquetage (12) sollicité par un interrupteur thermique (8) sont montés de manière à pouvoir pivoter indépendamment l'un de l'autre et séparément, chacun sur un côté d'un levier de contact (3). Les deux leviers précités (12, 14) sont en prise par leurs bras parallèles superposés (14a, 12a), au dessous d'un point d'encliquetage qui est formé par l'extrémité repliée (2a) d'un levier à cliquet (2) et par un nez (3a) formant une saillie façonnée directement sur le levier de contact (3). Par déplacement d'une manette à commande manuelle (1) en une position correspondant au point mort supérieur du levier à cliquet (2), le mécanisme de commutation se trouve tendu, le levier de contact (3) prenant alors appui sur le contact fixe (5) et sur le point d'encliquetage (2a, 3a). En cas de surintensité, l'interrupteur thermique (8/8a) non réglable et fixé rigidement s'incurve et déplace le levier de décliquetage (12) dans le sens des aiguilles d'une montre, cependant qu'en cas de court-circuit, le mouvement de déclenchement de l'interrupteur magnétique (9) est transmis dans le sens inverse des aiguilles d'une montre au levier de déclenchement (14), de sorte que le point d'encliquetage peut être dégagé indépendamment. Le mécanisme de commutation convient notamment pour des disjoncteurs de protection de construction étroite.Protection circuit breakers have a contact point of interruption which is most often snapped in by means of a toggle mechanism. If an abnormally high current is flowing, the ratchet point is disconnected by means of a thermal or magnetic switch, so that the current is interrupted. For the switching mechanism, the triggering movements of the two switches must be transmitted to the ratchet point, by means as simple as possible, completely uncoupled from each other. For this purpose, a release lever (14) actuated by a magnetic switch (9) and a release lever (12) actuated by a thermal switch (8) are mounted so as to be able to pivot independently of each other. and separately, each on one side of a contact lever (3). The two aforementioned levers (12, 14) are engaged by their superimposed parallel arms (14a, 12a), below a latching point which is formed by the folded end (2a) of a ratchet lever ( 2) and by a nose (3a) forming a projection shaped directly on the contact lever (3). By moving a manually operated lever (1) to a position corresponding to the upper dead center of the ratchet lever (2), the switching mechanism is tensioned, the contact lever (3) then resting on the fixed contact (5) and on the click point (2a, 3a). In the event of overcurrent, the non-adjustable and rigidly fixed thermal switch (8 / 8a) bends and moves the release lever (12) clockwise, while in the event of a short circuit , the triggering movement of the magnetic switch (9) is transmitted counterclockwise to the trigger lever (14), so that the snap point can be released independently. The switching mechanism is particularly suitable for narrowly constructed protective circuit breakers.

Description

Be s c h r e i b u ng :Description :
"SchaLtmechanismus für einen Leitungsschutzschalter""Switching mechanism for a circuit breaker"
Die Erfindung betrifft einen SchaLtmechanismus für einen Leitungsschutzschalter, bei dem mitteLs eines in Ausscha Lt ri chtung federbe Lasteten Handbed i enungsknebe Ls und eines daran schwenkbar angeLenkten Klinkenhebels über eine Verk Li nkungsste L Le ein sich in Kontaktsch L i eßri chtung unter der Wirkung einer Koπtaktfeder befindlicher, die Verklinkungsstelle tragender Kontakthebel in Seh l i eßste L Lung mit einem festen Kontaktstück bringbar ist, wobei der Kontakthebel an der Verklinkungsstelle sowie am festen Kontaktstück abgestützt und von der Kontaktfeder gehalten ist, und mit einem auf die Verklinkungsstelle einwirkenden, schwenkbar gelagerten Aus Lösehebe L , der von magnetischen und/oder thermischen Auslösern verdrehbar ist.The invention relates to a switching mechanism for a circuit breaker, in which the middle of a spring-loaded manual operating lever Ls and a pivotally hinged latch lever via a latching lever L le, which is in contact with one another under the action of a contact spring located contact lever carrying the latching point can be brought into a fixed Lung with a fixed contact piece, the contact lever being supported on the latching point and on the fixed contact piece and being held by the contact spring, and having a pivotably mounted release lever L acting on the latching point , which can be rotated by magnetic and / or thermal triggers.
Ein derartiger Schaltmechanismus ist aus der DE 29 38 858 C2 bekannt. Hierbei wirkt der von einer magnetischen Aus Löseei n ri chtung und von einem Bimetall verschwenkbare Auslösehebel mit einem Hebelarm auf die abgewinkelte Verlängerung des Klinkenhebels ein, während an seinem anderen Hebelarm die Aus Löseorgane direkt oder über einen Zwischenschieber angreifen. Zusätzlich ragt ein weiterer Hebelarm des Aus Lösehebe ls in den Schwenkbereich des die Ver linkungsstelle tragenden Kontakt hebe Ls . Bei diesem SchaLtmechanismus wirken sowohl das magnetische als auch thermische Auslöseorgan im gleichen Rich ungssinn auf den die Verklinkungsstelle Lösenden AusLösehebel ein. Da bei einer überlast der Bimetallauslöser jedoch einem anderen Bewegungsablauf unterliegt als der Magnetauslöser bei einer Ku rzs ch lußabscha Ltung , ist eine optimale Abstimmung der beiden unterschiedl chen Bewegungen an den erforderlichen Ent k L i nkungsweg der Scha Ltme chani k kaum möglich. Außerdem führt die Kopplung der Aus Löseorgane zu einer ungünstigen Massenanhäufung und einer dadurch bedingten größeren Stoß- und Rüttelempfindlichkeit des Schalters. Weiterhin ist ein Selbstschalter bekannt (DE 35 15 297 A1 ) , bei dem e ein magnetisches und therm sches Auslöseorgan mittels einzeln einstellbarer Übertragungsglieder in Wirkverbindung mit einer Verklinkungsstelle der Scha Itmechaπi k befindlich sind. Das Übertragungsglied für das thermische Auslöseorgan ist ein von einem Bi meta L Ist rei fen 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 Entk l i nkungs ri chtung verschwenkbar. Durch die getrennte Anordnung der Übertragungsglieder ist zwar die Einstellung des Bimetallauslösers vereinfacht, letztlich erfolgt jedoch die Übertragung der Bewegungen beider Auslöseorgane auf einen gemeinsamen Auslösehebel. Damit ergibt sich auch bei dieser Anordnung eine gegenseitige Kopplung der Aus Löseorgane.Such a switching mechanism is known from DE 29 38 858 C2. Here, the release lever, which can be pivoted by a magnetic release device and by a bimetal, acts with a lever arm on the angled extension of the ratchet lever, while on its other lever arm the release members act directly or via an intermediate slide. In addition, another lever arm of the release lever l protrudes into the swivel range of the contact lever L carrying the link. With this switching mechanism, both the magnetic and thermal release element act in the same direction on the release lever that releases the latching point. However, since the bimetallic release is subject to a different movement sequence than the magnetic release in the event of an overload, the two different movements can hardly be optimally matched to the required path of the switch. In addition, the coupling of the release elements leads to an unfavorable mass accumulation and the resulting greater sensitivity to shocks and jolts of the switch. Furthermore, a self-switch is known (DE 35 15 297 A1), in which a magnetic and thermal tripping element by means of individually adjustable transmission elements are operatively connected to a latching point of the switch mechanism. The transmission link for the thermal release element is an intermediate lever acted upon by a bi-meta L Ist tire, which in turn acts on a lever releasing the latching point. This lever can also be pivoted from the magnetic release element via a clutch lever and a bracket in the unlocking direction. The separate arrangement of the transmission elements simplifies the setting of the bimetallic release, but ultimately the movements of both release elements are transmitted to a common release lever. This also results in a mutual coupling of the release elements in this arrangement.
Der Erfindung Liegt die Aufgabe zugrunde, die Nachtei le der bekannten Schalter zu vermeiden und den eingangs erwähnten SchaLtmechanismus derart zu vereinfachen, daß die von den Auslöseorganen gesteuertenThe invention has for its object to avoid the Nachtei le of the known switches and to simplify the switching mechanism mentioned at the outset in such a way that those controlled by the triggering elements
Entk L i nkungsbewegungen vollständig voneinander entkoppelt sind und der ther ische Auslöser sich unabhängig vom magnetischen Auslöser optimal an die Verklinkungsstelle anpassen läßt.Unlatching movements are completely decoupled from one another and the thermal release can be optimally adapted to the latching point independently of the magnetic release.
Diese Aufgabe wird durch einen Schaltmechanismus m t den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Weiterbildungen und vortei lhafte Ausgestaltungen der Erfindung sind Gegenstände der Unteransprüche.This object is achieved by a switching mechanism m t with the characterizing features of claim 1. Further developments and advantageous embodiments of the invention are the subject of the dependent claims.
Bei dem erfindungsgemäßen SchaLtmechanismus sind in vor ei lhafter Weise der magnetische Auslöseweg und der thermische Auslöseweg in ihrer Wirkung auf die Entk L i nkungsste l Le vollständig voneinander getrennt. Da außerdem nur wenige Tei le vorhanden sind, wird eine hohe Schock- und Rüttelsicherheit erzielt. Bei der Einstellung des thermischen Aus Lösesystems tritt zudem keine Verformung von Bautei len auf, so daß das ganze System relativ unempfindlich ist. Aufgrund geringer zu bewegender Massen zeigt der gesamte Schaltmechanismus überdies ein äußerst schnelles Abscha ltverha Lten .In the switching mechanism according to the invention, the action of the magnetic release path and the thermal release path are completely separated from each other in their effect on the unlatching point. Since there are also only a few parts, a high level of shock and vibration resistance is achieved. When hiring the thermal release system also does not cause deformation of components, so that the whole system is relatively insensitive. Due to the small masses to be moved, the entire switching mechanism also shows extremely fast switch-off behavior.
Anhand der Zeichnung ist die Erfindung an einem Ausfüh rungsbei spi e L nachstehend näher erläutert.With the aid of the drawing, the invention is explained in more detail below in an exemplary embodiment.
Der in der einzigen Zeichnungsfigur schematisch gezeigte, in Ausschaltstellung befindliche Schaltmechanismus eines Lei tungss chutzscha Lte rs hat einen schwenkbaren Handbedienungsknebel (1), an dem ein bügeiförmiger Klinkenhebel (2) drehbar angelenkt ist. ieser bi ldet mit seinem abgewinkelten freien Ende (2a) eine Verklinkungsfläche, die mit einer Verklinkungsnase (3a) eines vorzugsweise starren Kontakt hebe ls (3) zusammenwirkt. Mittels eines Langloches (3b) ist der Kontakthebel schwenkbar auf einer Achse (3c) gelagert und wird seinerseits in Ausscha lt ri chtung von einer Kontaktfeder (4) belastet, die zwischen Langloch (3b) und Verklinkungsnase (3a) angreift. Am gegenüberliegenden Hebelarm arbeitet der Kontakthebel mit seinem kontakt sei t i gen Ende (3d) auf ein Festkontaktstüc k (5) .The switching mechanism of a circuit protection circuit, shown schematically in the switched-off position 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 nose (3a) of a preferably rigid contact lever (3). The contact lever is pivotably mounted on an axis (3c) by means of an elongated hole (3b) and is itself loaded by a contact 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 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 Verkl nkungsnase (3a) zu liegen und dreht anschließend den Kontakthebel um die Achse (3c) im Uhrzeigersinn entgegen der Kraft der Kontaktfeder (4) . Dabei berührt der Kontakthebel mit seinem kontaktsei t i gen Ende (3d ' ) das Fest kontakt stüc k (5), um danach innerhalb des Langloches (3b) von der Achse (3c) abzuheben, so daß die Kontaktfeder (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) clockwise comes with its latching surface in front of the latching nose (3a) to lie and then turns the contact lever around the axis (3c) clockwise against the force of the contact spring (4). The contact lever with its contact end (3d ') touches the fixed contact piece (5) in order to then lift off within the slot (3b) from the axis (3c) so that the contact spring (4) now generates the contact pressure and clamped 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 the 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 Bi meta 11strei fen (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 jus ierbare, etwa im gle chen Richtuπgssinn 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 e nen 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 bi meta 11strei fen (8a) and with its base (8b) preferably on a rear extension of an arc guide rail (10) which belongs to the quenching chamber (7) of the switch located below the contact point , rigidly attached. A line (11a) also leads from the base point (8b) to a connecting terminal (11). The bimetallic strip, which cannot be adjusted, is arranged approximately in the same direction as the contact lever, and is connected at its free end (8c), which is variable with the influence of heat, via a flexible line (8d) to the contact lever (3) and engages behind with its free-standing end (8c) 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 Kontakthebe ls (3) angepaßte Kurvenform aufweist. Fließt ein Strom durch den thermischen Auslöser, so krümmt sich der aufgrund des Innenwiderstandes s ch 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 Verklinkungsstelle gelöst wird. Unter der Wirkung der Kontaktfeder (4) verschwenkt der Kontakthebel (3) sodann in Ausscha lt ri chtung .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 latching point is released. Under the action of the contact spring (4), the contact lever (3) then pivots in the disengaging direction.
Der über das Festkontaktstüc k (5) ebenfalls im Strompfad zu einer nicht gezeigten weiteren Anschlußklemme liegende magnetische Auslöser (9) ist im wesentlichen durch eine von einem Rücksc lußeisen umgebene Auslösespule (9a) mit darin geführtem Tauchanker (9b) gebi ldet. Letzterer arbeitet mit seinem als Stößel ausgebi ldeten Ende auf einen Auslösehebel (14), der um eine gehäusefeste Achse (14c) schwenkbar an der dem Entklinkungshebel (12) gegenüberliegenden Seite des Kontak hebe L s 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 ausgebi ldet ist. Der bei einem Kurzschlußstrom in Richtung des Hebelarmes (14b) vorschnellende Tauchanker (9b) schwenkt den Auslösehebel im Gegenuhrzeigersinn derart, daß dieser d e Verklinkungsstelle (2a, 3a) löst und anschl eßend den Kontakthebel vom Hammerkopf beschleunigt in die gezeigte Offenstellung treibt, wobei die Kontaktfeder (4) zusätzlich als Öffnungsfeder wi rksam ist. Die Bewegung des Magnetaus lösers (9) wird über den Auslösehebel (14) somit vollkommen unabhängig von der Ent k l i nkungsbewegung des thermischen Auslösers (8) auf die Verklinkungsstelle übertragen. Die unabhängig voneinander jeweils an einer Seite des Koπtakthebels (3) i Gehäuse gelagerten Hebel (12 bzw. 14) übergreifen mit ihren Hebelarmen (12a bzw. 14a) den Kontakthebel im Bereich der Ver linkungsstelle 2a, 3a) derart, daß der Hebelarm (12a) des Entk li nkungshebe ls unter und der Hebelarm (14a) des Auslösehebels über dem vorzugsweise als Flachtei l ausgebildeten Kontakthebel zu liegen kommt. Dadurch ergeben sich für den an der Verklinkungsnase (3a) abgestützten Klinkenhebel (2) etwa ■ gleiche Entk l i nkungsbedi ngungen 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 Ei nscha ltVorganges anpassen, um auch im Fehlerfall, d. h. es liegt eine überlast bzw. ein Kurzschluß vor, frühzeitig eine Entklinkung herbeizuführen, noch bevor der Kontakthebel seine übliche in übertotpunktlage verspannte Position erreicht.The via the fixed contact piece (5) also in the current path to a further connection terminal, not shown, magnetic trigger (9) is essentially formed by a release coil (9a) surrounded by a back iron with a plunger (9b) guided therein. The latter works with its end designed as a plunger on a release lever (14) which is pivotable about a housing-fixed axis (14c) on the side of the contact lever L s opposite the release lever (12). The lever-shaped trigger lever (14a) also engages under the angled end (2a) of the latch 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 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 designed to be hammer-shaped. The plunger armature (9b), which snaps 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 latching point (2a, 3a) and then accelerates the contact lever from the hammer head into the open position shown, the contact 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 movement of the thermal release (8). The levers (12 and 14) mounted independently of each other on one side of the contact lever (3) i housing overlap with their lever arms (12a and 14a) the contact lever in the region of the linkage point 2a, 3a) in such a way that the lever arm (12a ) of the release lever below and the lever arm (14a) of the release lever comes to rest on the contact lever, which is preferably designed as a flat part. Characterized occur to those supported on the Verklinkungsnase (3a) of ratchet levers (2) about ■ same DESCAL li nkungsbedi ngungen and tilting of the angled end (2a) is practically excluded. The curved tops of the lever arms (12a or 14a) can also be optimally adapted to the movement of the ratchet lever (2) during the switch-on process, so that even in the event of a fault, i.e. there is an overload or a short circuit, unlatching can be achieved at an early stage , before the contact lever reaches its usual over-dead center position.
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 Aus lösebed ngungen abgestimmt werden können. Wie eingangs beschrieben, ist der Bimetallstreifen (8a) an seinem Fußpunkt (8b) fest angeordnet und hat selbst keine Justi ermög li cfAei t . Die Justierung des thermischen Auslösers erfolgt vielmehr in besonderer Weise durch relative Lageveränderung des Entk l inkungshebe ls (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 über lastst rom 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 firmly arranged at its base (8b) and has itself made no adjustment possible. Rather, the thermal release is adjusted in a special way by changing the relative position of the decalcifying 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 is in turn adjustable from outside the housing in the finished switch in a manner not shown. 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 Over loadst rom and the curvature of the bimetallic strip (8a) caused by this, the latching via the unlatching lever (12) is released precisely and the switching mechanism automatically interrupts the current flow at the contact point.

Claims

Patentansprüche: Claims:
1. SchaLtmechanismus für einen Leitungsschutzschalter, bei dem mittels eines in Ausscha Lt ri chtung federbe Lasteten Handbedienungsknebels und eines daran schwenkbar angelenkten Klinkenhebels über eine Verklinkungsstelle ein sich in Kontaktschließrichtung unter der Wirkung einer Kontaktfeder befindlicher, die Verklinkungsstelle tragender Kontakthebel in Seh Li eßste L Lung mit einem festen Kontaktstück bringbar ist, wobei der Kontakthebel an der Verklinkungsstelle sowie am festen Kontaktstück abgestützt und von der Kontaktfeder gehalten ist, und mit einem auf die Verklinkungsstelle einwirkenden, schwenkbar gelagerten Aus lösehebe L, der von magnetischen und/oder thermischen Auslösern verdrehbar ist, dadurch gekennzeichnet, daß der Auslösehebel (14) nur vom magnetischen Auslöser (9) beaufschlagt ist, und daß ein zweiter, vom Auslösehebel (14) unabhängig sowie getrennt schwenkbar gelagerter, direkt auf die Verklinkungsstelle (2a,3a) einwirkender Ent linkungshebel (12) in einer zur Schwenkebene des Aus lösehebe Ls (14) parallelen Ebene angeordnet und seinerseits unmittelbar mit einem starr im Gehäuse (6) angeordneten, nicht justierbaren Bimeta L laus Löser (8, 8a) in Eingriff bef ndlich ist.1.Switching mechanism for a circuit breaker in which, by means of a manual control toggle spring-loaded and a pivotally articulated ratchet lever via a latching point, a contact lever located in the contact closing direction under the action of a contact spring and carrying the latching point is in sight a fixed contact piece can be brought, wherein the contact lever is supported on the latching point and on the fixed contact piece and held by the contact spring, and with a acting on the latching point, pivotally mounted release lever L, which can be rotated by magnetic and / or thermal triggers, thereby characterized in that the release lever (14) is only acted upon by the magnetic release (9), and that a second, independently of the release lever (14) independently and separately pivotably mounted, directly acting on the latching point (2a, 3a) ent linkage lever (12) ina plane parallel to the swivel plane of the release lever Ls (14) is arranged and in turn is directly in engagement with a non-adjustable Bimeta L release (8, 8a) rigidly arranged in the housing (6).
2. SchaLtmechanismus nach Anspruch 1, dadurch gekennzeichnet, daß der Entklinkungshebel (12) ein Winkelhebel ist, dessen Drehpunkt (12c) auf einem einstellbaren Lagerzapfen (13a) angeordnet ist.2. Switching mechanism according to claim 1, characterized in that the unlatching lever (12) is an angle lever, the fulcrum (12c) of which is arranged on an adjustable bearing journal (13a).
3. Schaltmechanismus nach Anspruch 1 und 2, dadurch gekennze chnet, daß der Lagerzapfen (13a) des3. Switching mechanism according to claim 1 and 2, characterized in that the bearing pin (13a) of the
Entk Li nkungshebe Ls (12) exzentrisch auf einem im Gehäuse (6) drehbar angeordneten Lagerkörper (13) befindlich ist.Entk Li nkungshebe Ls (12) is located eccentrically on a bearing body (13) rotatably arranged in the housing (6).
4". Scha Ltmechani s us nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Auslösehebel (14) und der Entklinkungshebel (12) jeweils an einer Seite des vorzugsweise starren, eine Verklinkungsnase (3a) aufweisenden Kontakthebe Ls (3) getrennt voneinander angeordnet si nd .4 " . Switching mechanism according to Claims 1 to 3, characterized in that the release lever (14) and the unlatching lever (12) each have a latching nose (3a) on one side of the preferably rigid one. having contact lift Ls (3) are arranged separately from one another.
5. Schaltmechanismus nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Entklinkungs ebel (12) an seinem einen Hebelarm (12b) direkt vom freien Ende (8c) des starr angeordneten Bi meta L laus Lösers (8/8a) in Entk li nkungs ri chtung beaufschlagt ist.5. Switching mechanism according to one of claims 1 to 4, characterized in that the unlatching lever (12) on its one lever arm (12b) directly from the free end (8c) of the rigidly arranged Bi meta L laus solver (8 / 8a) in Entk is acted upon.
6. Schaltmechanismus nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Entklinkungshebel (12) mit seinem anderen abge inkelten Hebelarm (12a) unter den Klinkenhebel (2) angreifend bei einem Aus lösevorgang im Uhrzeigersinn verschwenkbar ist.6. Switching mechanism according to one of claims 1 to 5, characterized in that the unlatching lever (12) with its other abge angled lever arm (12 a) under the pawl lever (2) attacking during a release process can be pivoted clockwise.
7. Schaltmechanismus nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Auslösehebel (14) mit einem abgewinkelten freien Hebelarm (14a) unter dem Klinkenhebel (2) angrei end bei einem Auslösevorgang im Gegenuhrzeigersinn verschwenkbar ist.7. Switching mechanism according to one of claims 1 to 4, characterized in that the release lever (14) with an angled free lever arm (14a) below the ratchet lever (2) angrei end during a triggering process in the counterclockwise direction.
8. Schaltmechanismus nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die am Klinkenhebel (2) angreifenden Hebelarme (12a bzw. 14a) des Auslösehebels (14) und des Entkl i nkungs ebe Ls (12) oberhalb des8. Switching mechanism according to one of claims 1 to 7, characterized in that the lever arms (12a or 14a) of the release lever (14) and the decoupling lever (12) engaging the ratchet lever (2) above the
Kontakthebe Ldrehpunktes (3b/3c) gegenläufig überei nandergrei fend jeweils an einer Breitseite desContact lift L pivot point (3b / 3c) in opposite directions overlapping each other on a broad side of the
Kontakthebe Ls (3) angeordnet sind.Contact lift Ls (3) are arranged.
9. Schaltmechanismus nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Entklinkungshebel (12) ein Stanztei l ist.9. Switching mechanism according to one of claims 1 to 8, characterized in that the unlatching lever (12) is a punch l.
10. Schaltmec anismus nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Entklinkungshebel (12) ein metallisches Tei l ist, welches durch nachträgliche Oberflächenbehandlung elektrisch nichtleitend ausgebildet i st . 10. Schaltmec anism according to one of claims 1 to 9, characterized in that the unlatching lever (12) is a metallic part l, which is electrically non-conductive by subsequent surface treatment i st.
11. Schaltmechanismus nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Entklinkungshebel (12) ein Formtei l aus einem elektrisch nichtleitenden Werkstoff i st . 11. Switching mechanism according to one of claims 1 to 9, characterized in that the unlatching lever (12) is a molded part l made of an electrically non-conductive material i st.
EP90906912A 1989-05-27 1990-05-18 Switching mechanism for a line protective switch Expired - Lifetime EP0473619B1 (en)

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
DE3917326A DE3917326A1 (en) 1989-05-27 1989-05-27 SWITCHING MECHANISM FOR A CIRCUIT BREAKER
DE3917326 1989-05-27

Publications (2)

Publication Number Publication Date
EP0473619A1 true EP0473619A1 (en) 1992-03-11
EP0473619B1 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9015431A1 *

Also Published As

Publication number Publication date
EP0473619B1 (en) 1993-08-18
ES2044582T3 (en) 1994-01-01
WO1990015431A1 (en) 1990-12-13
DE3917326A1 (en) 1990-11-29
DE59002402D1 (en) 1993-09-23

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