EP0526355B1 - Einstellvorrichtung für Bimetalle eines Lastschalters - Google Patents

Einstellvorrichtung für Bimetalle eines Lastschalters Download PDF

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Publication number
EP0526355B1
EP0526355B1 EP92420245A EP92420245A EP0526355B1 EP 0526355 B1 EP0526355 B1 EP 0526355B1 EP 92420245 A EP92420245 A EP 92420245A EP 92420245 A EP92420245 A EP 92420245A EP 0526355 B1 EP0526355 B1 EP 0526355B1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
lever
bimetallic strip
axle
screw
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
EP92420245A
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English (en)
French (fr)
Other versions
EP0526355A1 (de
Inventor
Bernard Truchet
Jean-Marie Vergnes
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.)
Crouzet Automatismes SAS
Original Assignee
Crouzet Automatismes SAS
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Filing date
Publication date
Application filed by Crouzet Automatismes SAS filed Critical Crouzet Automatismes SAS
Publication of EP0526355A1 publication Critical patent/EP0526355A1/de
Application granted granted Critical
Publication of EP0526355B1 publication Critical patent/EP0526355B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/122—Automatic release mechanisms with or without manual release actuated by blowing of a fuse
    • 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
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal

Definitions

  • the present invention relates to a circuit breaker comprising a lug connected to a bimetallic strip, the inclination of which is adjustable by the action of a screw with a conical end parallel to the plane of the bimetallic strip.
  • a circuit breaker is known for example from document CH-A-511 510.
  • circuit breakers include an element, such as a bimetallic strip, which undergoes deformation when it is heated by the passage of a current.
  • the triggering device comprises a main bimetallic strip coupled by a connecting bar to a compensation bimetallic strip itself associated with triggering means.
  • the main bimetallic strips of circuit breakers generally include a fixed end with respect to the circuit breaker housing and a free end which is adjusted to a precise rest position determining the value of the tripping overcurrent of the circuit breaker. This precise position is generally obtained by adjusting the inclination of the bimetallic strip by a perpendicular screw pressing on the bimetallic strip and screwing into the circuit breaker housing.
  • the fixed end of the bimetallic strip is conventionally welded directly to an input terminal secured to the circuit breaker housing.
  • a drawback of this configuration lies in the fact that stresses external to the circuit breaker can deform the input terminal and alter the position of the bimetallic strip accordingly. These external stresses can for example be produced when a screw is tightened on the terminal to fix a cable.
  • circuit breakers are equipped with a signaling device which allows an operator to be informed that the circuit breaker is in the tripped state.
  • circuit breakers include a fixed contact and a movable contact associated with a control mechanism making it possible to apply the movable contact to the fixed contact when the circuit breaker is engaged and to cause the reverse movement when tripping.
  • the signaling devices are conventionally controlled by the triggering movement of the control mechanism.
  • an element in the current path such as the bimetallic strip, is provided to act as a fuse.
  • the control mechanism since the contacts have not been separated, the control mechanism remains blocked and does not activate the signaling device. Therefore, an operator cannot know that the circuit has been cut.
  • Multipole circuit breakers for polyphase current circuits generally include one pair of contacts per phase. These contact torques cooperate with a single control mechanism so that all the phases are cut during an overcurrent on one of the phases. If during an overcurrent, one of the contact pairs remains welded, as in the above case, the control mechanism remains blocked and the contact pairs associated with the other phases remain bonded, which is to be avoided.
  • An object of the present invention is to provide a reliable device for adjusting the position of the bimetallic strip.
  • circuit breaker comprising a lug connected to a bimetallic strip whose inclination is adjustable by the action of a tapered screw parallel to the plane of the bimetallic strip, characterized in that one end of the bimetallic strip is embedded in an insulating axis parallel to the plane of the bimetallic strip, the rotational position of this axis being adjustable by said tapered screw arranged parallel to the axis and coming to bear on a lever integral with the axis and perpendicular to it this.
  • said end of the bimetallic strip crosses the axis and is connected to the terminal by means of a flexible metal strip.
  • the section of the metal strip is chosen to melt when it is crossed by a predetermined current greater than the nominal tripping current of the circuit breaker.
  • the axis is ceramic.
  • the head of the screw and part of one end of the axis are visible outside the circuit breaker housing and in that it comprises means for locking in the adjusted position of the screw and the axis.
  • said blocking is achieved by depositing a polymerizable substance on the visible parts of the screw and of the axis.
  • An advantage of the present invention is that the metal strip can act as a fuse, which avoids a complex embodiment of bimetallic strip which must act as a fuse.
  • Figures 1A and 1B are all found in Figure 2A in a different view and we can refer to these three figures for a better overview of the shapes and arrangement of the elements.
  • FIGS. 1A to 2A an embodiment of a device for adjusting the position of a main bimetal strip 1. This device is shown isolated in FIG. 1A and cooperating with circuit breaker elements in FIGS. 1B and 2A.
  • the bimetallic strip is for example, as shown in FIG. 1A, in the shape of an inverted U, or, as shown in FIG. 1B, in the form of a meander, which is conventional for circuit breakers of small caliber.
  • the lower part of the bimetallic strip 1 is embedded in an insulating axis 2 (preferably ceramic) parallel to the plane of the bimetallic strip.
  • the front and rear ends of the axis 2 are articulated in the walls, not shown, front and rear of the circuit breaker housing, which is designated by the reference 3 in Figure 2A.
  • the axis 2 comprises a perpendicular lever 4 extending to the right.
  • the conical end of a screw 5 parallel to the axis 2 rests on the top of the lever 4.
  • the screw 5 is screwed into a thread of the rear wall of the housing 3 and its head 5-1 is visible outside the housing. Thus, by screwing or unscrewing the screw 5, one can adjust the tilt to the left of the bimetallic strip 1.
  • part of the axis 2 will also be visible outside the housing. This allows, once the inclination of the bimetallic strip adjusted, to immobilize the screw 5 and the axis 2 by depositing a drop of polymerizable resin on the visible parts of the screw and of the axis.
  • a compensation bimetallic strip 7 substantially parallel to the main bimetallic strip 1 is arranged to the right of the latter.
  • a connecting bar 8 which can slide to the left or the right in grooves in the front and rear walls of the housing 3.
  • the bimetallic strip 7 is in the form of an inverted U whose feet are mounted with play by their ends in grooves of a support 9 secured to the housing 3. This mounting of the feet of the bimetallic strip 7 constitutes an articulation leaving the bimetallic strip 7 a certain freedom of inclination.
  • a vertical locking lever 10 Between the feet of the bimetallic strip 7 is disposed a vertical locking lever 10, the base of which is mounted in the same manner in a groove in the support 9.
  • the locking lever 10 comprises, at approximately halfway up the bimetallic strip 7, two parts upper 10-1 folded to the right and extending forward and backward respectively. The parts 10-1 form buffers against which the bimetallic strip 7 will come to bear when it is inclined to the right.
  • a lock 12 has a spout 12-1 pressing on the upper part of the lever 10. This position of the lock 12 corresponds to the engaged position of the circuit breaker. As will be seen later, in this position, the spout 12-1 tends to descend to trip the circuit breaker, but it is retained by the locking lever 10.
  • a spring 14 in the form of a hairpin (shown in FIG. 2A ) is welded to the lever 10 and presses against the right wall of the housing 3. This spring maintains the lever 10 towards the bolt but the freedom of inclination of this lever, conferred by the mounting of the lever in the support 9, is such that the stops 10-1 do not press, at rest, on the bimetallic strip 7.
  • this device When the main bimetallic strip 1 is traversed by a current, it heats up and curves to the right. If the heating of the bimetallic strip 1 is sufficient, that is to say if the value and the duration of maintenance of the current in the bimetallic strip are sufficient, the bimetallic strip 1 bends by catching up with the longitudinal play of the bar 8 between the upper ends of bimetallic strips. From this moment, if the bimetallic strip 1 continues to bend, the bimetallic strip 7 comes to press on the stops 10-1 by pushing the locking lever 10 to the right against the spring 14. Then, the lever 10 releases the nozzle 12-1 which descends causing the tripping of the circuit breaker.
  • the heating required by the bimetallic strip 1 for tripping of the circuit breaker to occur is a function of the play to be made up previously mentioned.
  • This clearance therefore determines the value of the overcurrent which trips the circuit breaker.
  • the value of this clearance corresponding to a nominal overcurrent is adjusted during manufacture, as indicated above, by adjusting the inclination of the main bimetal strip 1 using the tapered screw 5.
  • the role of the compensation bimetallic strip 7 is, moreover, to bend the same amount as the main bimetallic strip 1 when the temperature in the circuit breaker housing increases so that the adjustment clearance remains constant. Considering that the bimetallic strips bend in the shape of an arc of a circle, the position of the bimetallic strip 7 at the height of the stops 10-1 varies little.
  • FIG. 2A also represents a flexible metal strip 15 connecting a terminal 1-1 of the bimetallic strip, protruding under the axis 2, to a terminal 17 extending downward and to the left outside the case of the circuit breaker 3.
  • the web flexibility 15 prevents the transmission of possible deformations of the terminal 17 to the main bimetal strip 1. By adapting the section of the strip 15, this can act as a fuse which would melt in the event of excessive overcurrent if the contacts of the circuit breaker do not come off . This avoids the complexity of producing a main bimetallic strip 1 which must also act as a fuse.
  • FIGS. 2A and 2B an embodiment of a complete circuit breaker will be described in more detail.
  • a vertical fixed contact 19 is fixed to the lower right part of the circuit breaker with a lug 21 extending downwards and to the right outside the casing 3 of the circuit breaker.
  • a movable contact 23 is fixed on a contact carrier 24 extending upwards.
  • An output terminal 1-2 (visible in FIG. 1) of the bimetallic strip 1 is in this example connected to a non-visible fixed contact located behind the fixed contact 19 and the movable contact 23 is in fact a double contact coming to connect the two fixed contacts to close the circuit.
  • FIG. 2A corresponds to the tripped position of the circuit breaker.
  • the movable contact 23 is shifted to the left and upwards relative to the fixed contact 19.
  • the control mechanism which will be described below, makes d first lower the contact 23 and then apply it by a rotational movement on the contact 19.
  • the lock 12 is articulated by an axis 25 on a slide 26.
  • a vertical oblong hole 28 (shown in dotted lines) formed in the front and rear walls of the housing 3 and in which the axis 25 slides, gives the slide 26 freedom displacement between a high position (Figure 2A) and a low position ( Figure 2B).
  • the shapes of the latch 12 and of the slide 26 are more visible, in FIG. 2B where there is no shown some elements, the lock being shown in bold lines.
  • the lock includes an extension 12-2 to the left and downwards and an extension 12-3 downwards.
  • the slide 26 comprises at its upper part a cylindrical part 26-1 connected to the rest of the slide by a thinning.
  • the cylindrical part is of horizontal axis and parallel to the bimetallic strips.
  • the lower part of the slide 26 comprises a slot 26-2, one wall of which is vertical and the other slightly inclined to the right. In this slot 26-2 is housed the upper end of the contact carrier 24.
  • the contact carrier 24 has a certain freedom of rotation relative to the fulcrum of the end of the contact carrier against the bottom of slot.
  • the contact carrier is held in this slot by a protrusion 12-4 extending to the left from the extension 12-3 and sliding in a groove in the contact carrier 24.
  • the lower part of the slide 26 has a shoulder 26-3 arranged to the right and opposite the extension 12-2 of the latch 12.
  • the axis 25 comprises two spiral springs.
  • a spiral spring 30 is supported between the extension 12-2 and the contact carrier 24 and tends to press the contact carrier on the extension 12-3.
  • Another thinner spiral spring 31 is supported between the extension 12-2 and the shoulder 26-3 tending to rotate the lock 12 clockwise around its axis 25.
  • the spring 30 maintains the contact carrier 24 in abutment against the extension 12-3 of the lock.
  • the latch 12, the contact carrier 24 and the spring 30 form in this position a single part which can rotate around the axis 25. This single part is held in abutment against the left face of the slot 26-2 by the spring 31 .
  • FIG. 2B the slide 26 is shown in the low position where the contacts 23 and 19 are closed.
  • the spout 12-1 bears on the upper part of the locking lever 10 and the single piece (12, 24, 30) rotates anti-clockwise by compressing the spring 31 between extension 12-2 and shoulder 26-3.
  • This single part rotates until the contact 23 meets the contact 19.
  • the latch 12, the contact carrier 24 and the spring 30 become independent parts again.
  • the contact 23 and its contact carrier 24 remain stationary and the latch 12 continues to rotate while compressing the spring 30 which then ensures the energetic plating of the contact 23 on the contact 19.
  • FIGS. 2A and 2B are stable positions obtained using the elements described below.
  • a control button 35 comprising vertical internal and external cylindrical parts which guide the button on either side of an upper cylindrical part of the housing 3.
  • a spring 37 pressing between the button 35 and part of the housing 3 tends to lift the button.
  • the upper part of the button 35 has an axis 38 on which is hinged a pair of pliers 39 trapping the cylindrical part 26-1 of the slide 26.
  • the pliers 39 slide vertically through the upper part of the housing 3 in a parallel slot 40 in the plane of the clamps.
  • the visible rear wall of the slot 40 is shown in gray.
  • the lever 10 is moved to the right, the spout 12-1 is released and the latter no longer exerts any force maintaining the cylindrical part 26-1 against the bottom of the clamps.
  • the clamps 39 can close under the force of the spring 37 and go back up by pulling the slide by the cylindrical part 26-1 to reach the position of FIG. 2A.
  • the latch 12 rotates clockwise under the action of the springs 30 and 31, separating the contacts and rises simultaneously.
  • FIGS. 3A and 3B represent two positions of an embodiment of a trip signaling device adapted to the circuit breaker previously described.
  • a spring 50 resting on the support 9 tends to lift the locking lever 10 which is slidably mounted at its base in the support 9.
  • the spring 50 is placed in slots 10-2 of the lever 10, shown in the figure 1, opening on the side of the support 9.
  • Extensions 7-1 downwards and to the right of the bimetallic strip 7 prevent the lever from lift too much and get out of its support 9. These extensions 7-1 are better visible in Figure 1.
  • FIG. 3A corresponds to the engaged position of FIG. 2A where the spout 12-1 presses on the upper part of the locking lever 10.
  • the stiffness of the spring 50 is chosen so that the pressure of the spout 12-1, caused by the springs 30 and 31 mentioned above, completely compresses the spring 50.
  • FIG. 3B illustrates a position at an instant immediately following the release of the spout 12-1 after an overcurrent has caused the locking lever 10 to move to the right and the release of the spout 12-1. Then, the spring 50 relaxes by lifting the locking lever 10.
  • This lever 10 arrives in the high position when a part of this lever brings into abutment a mechanism, such as a signaling mechanism comprising the elements not yet described in FIGS. 3A and 3B.
  • the high position of the lever is such that the part of the lever 10 on which the spout 12-1 rests is located below the spout 12-1 when the latch 12 is in its high position.
  • FIGS. 3A and 3B illustrate an application in which the lever 10 actuates a trigger signaling mechanism.
  • This mechanism includes a lever 52 articulated around an axis 53 secured to the circuit breaker housing.
  • the lever 52 has a part 52-1 extending to the left above the lever 10 and a part 52-2 extending downwards.
  • a conductive elastic blade 55 is mounted on a vertical insulating plate 56 fixed to the circuit breaker housing and extends down to the left of the part 52 -2 of the lever 52.
  • the plate 56 comprises a contact 57 at the level of the part lower part of the blade 55.
  • FIG. 3B when the locking lever 10 rises, an element secured to the lever 10, for example the upper part of the above-mentioned spring 14, comes to bear on the part 52-1 of the lever 52.
  • This lever 52 pivots and its part 52-2 applies the lower end of the blade 55 to the contact 57. Closing this contact can, for example, sound an alarm or light a warning light.
  • FIGS. 4A and 4B illustrate an application of the mechanism of FIGS. 3A and 3B to a safety device enabling the contacts of a multipole circuit breaker to be separated simultaneously.
  • a multipole circuit breaker comprises several pairs of contacts each associated with an isolated electrical circuit.
  • Figures 4A and 4B show positions corresponding to Figures 3A and 3B and there are the same elements designated by the same references. The elements represented are those associated with a single pair of contacts.
  • the latches 12 associated respectively with each of the pairs of contacts are articulated around the same axis 25 which is actuated by a single control mechanism (slide 26, button 35, clamps 39).
  • the simultaneous separation device comprises a lever 60 secured to an axis 61 articulated with respect to the circuit breaker housing and disposed to the left of the lever 10.
  • the lever 60 is made to rotate with the axis 61, for example as shown , by a part folded 60-1 on a flat part of the axis 61.
  • the lever 60 comprises a part 60-2 extending above the stop 10-1 of the locking lever 10 and a spout 60-3 nearby of the locking lever 10 below the stopper 10-1.
  • the signaling device described in relation to FIGS. 3A and 3B can be combined with the safety device of the multipole circuit breaker of FIGS. 4A and 4B.
  • the mechanism of FIGS. 3A to 4B applies to any circuit breaker comprising a mechanism in which the latch has a descending movement for engaging the circuit breaker.

Claims (6)

  1. Schaltungsunterbrecher, der folgendes aufweist: einen Ansatz bzw. Anschluß (17), der mit einem Bimetall bzw. -element (1) verbunden ist, das eine Neigung aufweist, die mittels einer Schraube mit einer verjüngten Spitze einstellbar ist, die parallel zu der Ebene des Bimetalls ist, dadurch gekennzeichnet, daß ein Ende des Bimetalls in einer isolierenden Achse (2) eingebettet ist, die parallel zu der Ebene des Bimetalls (1) ist, wobei die Drehposition der Achse einstellbar ist durch die parallel zu der Achse angeordnete Schraube (5) mit verjüngter Spitze die auf einen Hebel (4) drückt, der an der Achse (2) befestigt und zu dieser senkrecht ist.
  2. Schaltungsunterbrecher nach Anspruch 1, dadurch gekennzeichnet, daß ein Ende des Bimetalls (1) durch die Achse hindurchgeht und durch ein flexibles Metallband (15) mit dem Ansatz (17) verbunden ist.
  3. Schaltungsunterbrecher nach Anspruch 2, dadurch gekennzeichnet, daß der Querschnitt des Metallbandes (15) so ausgewählt ist, daß er schmilzt, wenn ein vorbestimmter Strom dorthindurch fließt, der höher ist als der nominale Auslösestrom des Schaltungsunterbrechers.
  4. Schaltungsunterbrecher nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß die Achse aus Keramik hergestellt ist.
  5. Schaltungsunterbrecher nach Anspruch 1, dadurch gekennzeichnet, daß der Kopf der Schraube (5) und ein Teil eines Endes der Achse (2) von außerhalb des Gehäuses (3) des Schaltungsunterbrechers zu sehen sind, und dadurch daß der Schaltungsunterbrecher Mittel aufweist zum Blockieren der Schraube und der Achse in einer eingestellten Position.
  6. Schaltungsunterbrecher nach Anspruch 5, dadurch gekennzeichnet, daß das Blockieren erreicht wird durch Abscheiden bzw Aufbringen eines Materials, das Polymerisieren kann und zwar auf den sichtbaren Teilen der Schraube und der Achse.
EP92420245A 1991-07-25 1992-07-21 Einstellvorrichtung für Bimetalle eines Lastschalters Expired - Lifetime EP0526355B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109685A FR2679699B1 (fr) 1991-07-25 1991-07-25 Dispositif de reglage d'une bilame d'un disjoncteur.
FR9109685 1991-07-25

Publications (2)

Publication Number Publication Date
EP0526355A1 EP0526355A1 (de) 1993-02-03
EP0526355B1 true EP0526355B1 (de) 1996-10-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420245A Expired - Lifetime EP0526355B1 (de) 1991-07-25 1992-07-21 Einstellvorrichtung für Bimetalle eines Lastschalters

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US (1) US5257001A (de)
EP (1) EP0526355B1 (de)
DE (1) DE69214894T2 (de)
FR (1) FR2679699B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2748151B1 (fr) * 1996-04-30 1998-07-10 Crouzet Automatismes Systeme de commande manuelle d'un organe de commutation electrique
US6084193A (en) * 1998-10-07 2000-07-04 Texas Instruments Incorporated Electrical circuit interruption device having improved arc extinguishing apparatus including an arc paddle
CA2405209A1 (en) 1999-04-13 2000-10-19 Christopher Lee Somerville Terminal for an active labelling system
WO2013084242A2 (en) 2011-12-07 2013-06-13 Rao Css System and method for providing a secure electronic identification and management system for livestock with ownership interface, e-governance and global supply chain traceability for products of animal origin

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697915A (en) * 1970-10-26 1972-10-10 Texas Instruments Inc Circuit breaker having means for increasing current carrying capacity
CH511510A (de) * 1970-11-24 1971-08-15 Maier & Cie C Bimetall-Überstromauslöser
DE2448026C3 (de) * 1974-10-09 1978-09-28 Ellenberger & Poensgen Gmbh, 8503 Altdorf Direkt beheizter Bimetallstreifen zur thermischen Auslösung eines Überstromschalters
US4812799A (en) * 1987-04-02 1989-03-14 Texas Instruments Incorporated Miniature circuit breaker with improved longevity
US4837545A (en) * 1987-04-02 1989-06-06 Texas Instruments Incorporated Miniature circuit breaker with improved longevity
US4827233A (en) * 1987-04-02 1989-05-02 Texas Instruments Incorporated Miniature circuit breaker with improved longivity
US4780697A (en) * 1987-04-02 1988-10-25 Texas Instruments Incorporated Miniature circuit breaker with improved longevity

Also Published As

Publication number Publication date
US5257001A (en) 1993-10-26
FR2679699A1 (fr) 1993-01-29
DE69214894D1 (de) 1996-12-05
EP0526355A1 (de) 1993-02-03
DE69214894T2 (de) 1997-05-22
FR2679699B1 (fr) 1995-03-10

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