EP0097557B1 - Nebenschlussstromkreis für den Auslöser eines Leistungsschalters - Google Patents

Nebenschlussstromkreis für den Auslöser eines Leistungsschalters Download PDF

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Publication number
EP0097557B1
EP0097557B1 EP19830401117 EP83401117A EP0097557B1 EP 0097557 B1 EP0097557 B1 EP 0097557B1 EP 19830401117 EP19830401117 EP 19830401117 EP 83401117 A EP83401117 A EP 83401117A EP 0097557 B1 EP0097557 B1 EP 0097557B1
Authority
EP
European Patent Office
Prior art keywords
circuit
coil
shunt
circuit breaker
trip device
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
Application number
EP19830401117
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English (en)
French (fr)
Other versions
EP0097557A1 (de
Inventor
Louis Boillot
Jacky Duchenaud
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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Filing date
Publication date
Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0097557A1 publication Critical patent/EP0097557A1/de
Application granted granted Critical
Publication of EP0097557B1 publication Critical patent/EP0097557B1/de
Expired 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
    • H01H71/121—Protection of release mechanisms
    • 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
    • H01H2071/749—Means for adjusting the conditions under which the device will function to provide protection with a shunt element connected in parallel to magnetic or thermal trip elements, e.g. for adjusting trip current

Definitions

  • the shunt is formed by a metallic piece of nickel-chromium alloy, specially incorporated in the circuit breaker to protect the bimetallic strip against excessive heating caused by the passage short-circuit current.
  • This additional part has a large thermal capacity and its installation inside the molded case can present difficulties in miniature circuit breakers with reduced overall dimensions.
  • Document FR-A-2 434 474 relates to a circuit breaker with caliber adjustment, in particular a subscriber circuit breaker, comprising shunt means constituted by at least one conductor in shunt, cooperating with the electrical connection connecting one of the contacts to the associated connection terminal.
  • An auxiliary switch is interposed on the bypass conductor, controlled in opening and closing by a caliber adjustment cam.
  • Such an arrangement complicates the manufacture of the circuit breaker at the level of said electrical connection, which leads to an increase in size which is incompatible with the housing of a miniature circuit breaker. Adjusting the caliber also requires a cam that can be actuated from the outside.
  • a pole of a miniature low-voltage electric circuit breaker comprises a housing 10 of molded insulating material having a base 12 adaptable to a support rail by means of a latch 14, and a opposite front face 15 provided with an opening for the passage of a control handle 16.
  • Two terminals 18, 20 for connecting the circuit breaker are arranged on the narrow lateral faces of the housing 10.
  • the circuit breaker is of the type described in document FR-A-2 468 202 by the applicant, and comprises a pair of separable contacts 22, 24, a breaking chamber 26 with arc deionization plates, and an operating mechanism 28 associated with the manual control lever 16 and with tripping means formed by a bimetal thermal trip device 30 and an electromagnetic trip device 32 capable of causing automatic opening of the contacts 22, 24 in the event of an overload or short-circuit.
  • the fixed contact 22 is connected by a loop conductor to the terminal 18 and the movable contact 24 actuated by the operating mechanism, is articulated on a contact arm 34 pivotally mounted on a rocker arm 36.
  • the latter is coupled to a toggle joint 38 integral with the lever 16; a trigger lever 40 pivotally mounted on an axis 42 cooperates with the end 44 of the contact arm 34 opposite the movable contact 20, so as to secure the arm 34 to the rocker arm 36.
  • a lock 46 ensures the attachment of the trip lever 40 in the locked position so as to allow transmission of the pivoting movement of the lever 16 to the movable contact 24 for manual control of opening and closing of the circuit breaker.
  • the automatic opening of the contacts 22, 24 is caused by a pivoting of the latch 46 towards an unlocked position which releases the trigger lever 40 driving under the action of a spring the contact arm 34 pivoting towards the open position.
  • the latch 46 is actuated towards the unlocked position by the deflection of the bimetallic strip 30, in the event of overload and by the electromagnetic trip device 32 when a short circuit occurs.
  • the electromagnetic trip device 32 arranged in the central part of the circuit breaker between the breaking chamber 26 and the rocker arm 36 of the mechanism 28, comprises a coil 48 surrounded by a carcass 50 made of ferromagnetic material, in particular steel.
  • the coil 48 is mounted on an insulating sheath inside which slides a plunger core 52 provided with an actuating rod 54 serving as an extractor for the contact arm 34.
  • the plunger core 52 cooperates by its opposite end with a pushbutton for controlling the lock 46 which is moved to the unlocking position when the excitation current of the coil 48 exceeds a predetermined threshold.
  • a return leaf spring 56 in the form of a pin biases the latch 46 in the latching position, in particular when the current intensity in the coil 48 is less than the triggering threshold.
  • the bimetallic thermal trip device 30 of the direct heating type is formed by an elongated blade extending in the space formed between the coil 48 and the terminal 20 in a direction perpendicular to the front face 15 and to the sheets of the chamber 26.
  • the base of the bimetallic strip 30 is fixed to the carcass 50 at a point 58 electrically connected to the connection terminal 20.
  • the opposite active end of the bimetallic strip 30 cooperating with the latch 46 is connected to one of the ends of the coil 48 by the 'through a flexible conductor, in particular a braid 60.
  • the coil 48 and the bimetallic strip 30 are connected in series in a main tripping circuit.
  • circuit breaker is well known and is particularly suitable for ratings up to 38 Amps. Beyond this nominal current arise in particular problems of heat dissipation, overheating and size of the circuit breaker.
  • the other end of the coil 48 opposite the braid 60 is welded directly at a second point 62 of the ferromagnetic carcass 50, and a flexible conductor 64 connects the point 62 to the contact arm 34. It follows that a portion of the ferromagnetic carcass 50 located between the two separate points 58, 62 forms a metallic shunt 66, connected in parallel to the main series trigger circuit comprising the bimetallic strip 30 and the coil 48. In the closed position contacts 22, 24, part of the nominal current then passes through the shunt 66 of the ferromagnetic carcass 50, and the other part 1 2 of the current flows in the main circuit of the coil 48 and the bimetallic strip 30.
  • the impedance of the metallic shunt 66 is such that the distribution of the current in rated current regime is substantially balanced between the main series circuit and the shunt circuit.
  • the ferromagnetic carcass of the shunt 66 has a large thermal capacity, the heat exchange surface of which with the surrounding air and with the molded material of the housing 10 makes it possible to dissipate in the same volume an energy greater than that of a conventional circuit breaker of 38 A for example.
  • the shunt 66 depends on the cut and folded structure of the ferromagnetic carcass 50 of the electromagnetic trip device 32.
  • the shunt 66 comprises a square part of the carcass 50, formed by a first upper tongue 70 located in the vicinity of the rocker arm 36 extending from point 62 parallel to the sheets of the chamber 26, and a second perpendicular tongue 72 arranged near the return spring 56 of the latch 46.
  • the tongue 72 is connected to the connection point 58 of bimetallic strip 30 by a conductor 74.
  • the shunt 66 is constituted by a square opposite to that of FIG. 1.
  • the bracket has a tongue 76 extending from point 62 perpendicular to the sheets of the chamber 26 and connected at right angles to a lower plate 78 arranged parallel and at a short distance from the horn 80 of the arc.
  • the plate 78 adjacent to the horn 80 is directly connected to the point 58 of connection of the bimetallic strip 30.
  • the shunt instead of being formed by a part of the casing of the electromagnetic trip device, as described in ref Reference to Figures 1 and 2, is constituted by a median plate 132 of metallic material, formed between two breaking chambers 134, 136 of a circuit breaker with high breaking capacity.
  • the metal plate 132 is inserted inside an insulating partition 130 which subdivides the lower part of the housing 110 into two adjacent parts for housing the interrupting chambers 134, 136.
  • On either side of the central partition 130 are respectively arranged in arcing chambers 140, 142, fixed contacts 146, 148 cooperating with movable contacts 150, 152 carried by a common support in the form of a fork 154 constituting a contact bridge.
  • Electrodes 156, 158 extend the fixed contacts 146, 148 to connect to the end plates of the interrupting chambers 134, 136.
  • the electrode 158 is connected directly to the fixed contact 148 and the other electrode 156 is electrically connected to the metal plate 132 by means of a folded tab 162.
  • the fixed contact 146 instead of being separated from the electrode 156 by an insulating gap, is connected by a conductor 180 to the tab 162 for connecting the electrode 156 and the metal plate 132.
  • the electrical circuit of FIG. 4 shows that the nominal current path starts from the terminal 126 connected to the fixed contact 148, then traverses the contact bridge of the fork 154, then the other fixed contact 146. At this point, a part of the nominal current flows in the main trip circuit formed by the coil 168 of the electromagnetic trip device in series by a braid 108 with the bimetallic strip 188. The other part of the rated current follows the parallel path of the metallic plate 132 forming the connected shunt 66 at the other terminal 128.
  • the legs 102 and 162 constitute the connection points of the two circuits in parallel.
  • the circuit breaker rating can reach 100 A.

Landscapes

  • Breakers (AREA)

Claims (7)

1. Elektrischer Niederspannungs-Leistungsschalter mit einem gegossenen Isoliergehaeuse (10), das einen Betaetigungsmechanismus enthaelt, der mit einem automatischen Ausloeser und mit einem von Hand betaetigten Steuerhebel (16) verbunden ist, wobei jeder Pol des Schalters aufweist :
wenigstens ein Paar trennbarer Kontakte (22, 24),
ein Paar Anschlussklemmen (18, 20),
eine Loeschkammer (26) fuer den zwischen den getrennten Kontakten gezogenen Lichtbogen,
einen Haupt-Ausloesekreis, der einen thermischen Bimetallstreifen-Ausloeser (30) und einen elektromagnetischen Ausloeser (32) mit Spule (48) aufweist, die im Falle einer Ueberlast oder eines Kurzschlusses mit einem Riegel (46) des Mechanismus zusammenarbeiten koennen zur automatischen Oeffnung der Kontakte,
und einen Nebenschlusskreis (66), der parallel auf dem Haupt-Ausloesekreis geschaltet ist, wobei der genannte Nebenschluss aus einem metallischen leitfaehigen Material besteht, der einen Teil des Nennstroms jedes Pols ableitet, waehrend der andere Teil in dem Bimetallstreifen (30) und der Spule (48) fliesst,

dadurch gekennzeichnet, dass der Nebenschlusskreis (66) des Nennstromes von einem Teil des ferromagnetischen Gehaeuses (50) gebildet wird, das die Spule (48) des elektromagnetischen Ausloesers (32) umrahmt.
2. Elektrischer Leistungsschalter gemaess Anspruch 1, dadurch gekennzeichnet, dass der Nebenschlusskreis (66) von zwei Punkten (58, 62) zum Anschluss des Gehaeuses (50) begrenzt wird, wobei einer der Punkte (58) dem Bimetallstreifen (30) als Traeger dient und mit einer der Klemmen (20) in elektrischer Verbindung steht, und wobei der andere Punkt (62) mit einem der Enden der Spule (48) und mit einem mit dem beweglichen Kontaktarm (34) verbundenen flexiblen Leiter (64) verbunden ist.
3. Elektrischer Leistungsschalter gemaess Anspruch 2, dadurch gekennzeichnet, dass der Nebenschlusskreis (66) ein winkelfoermiges Teil des Gehaeuses (50) aufweist, welches von einer ersten oberen Zunge (70) gebildet wird, die zwischen der Spule (48) und dem Mechanismus (28) gelegen ist und die sich vom Verbindungspunkt (62) aus parallel zu den Blechen der Loeschkammer (26) erstreckt, und von einer zweiten senkrechten Zunge (72), die zwischen der Spule (48) und der Rueckholfeder (56) des Riegels (46) liegt.
4. Elektrischer Leistungsschalter gemaess Anspruch 2, dadurch gekennzeichnet, dass der Nebenschlusskreis (66) mit einem winkelfoermigen Teil des Gehaeuses (50) versehen ist, welches von einer Zunge (76) gebildet wird, die sich vom Verbindungspunkt (62) aus senkrecht zu den Blechen der Loeschkammer (26) erstreckt und rechtwinklig mit einer unteren Platte (78) verbunden ist, die zwischen der Spule (48) und dem Lichtbogenhorn (80) der Loeschkammer (26) angeordnet ist, wobei die genannte Platte (78) parallel zu dem Lichtbogenhorn (80) und mit dem Verbindungspunkt (58) des Gehaeuses (50) verbunden ist.
5. Elektrischer Niederspannungs-Leistungsschalter mit einem gegossenen Isoliergehaeuse (10), das einen Betaetigungsmechanismus enthaelt, der mit einem automatischen Ausloeser und mit einem von Hand betaetigten Steuerhebel (16) verbunden ist, wobei jeder Pol des Schalters aufweist :
zwei Paar trennbarer Kontakte (146, 150, 148, 152),
ein Paar Anschlussklemmen (126, 128),
zwei nebeneinander angeordnete Loeschkammern (134, 136),
einen Haupt-Ausloesekreis, der einen thermischen Bimetallstreifen-Ausloeser (188) und einen elektromagnetischen Ausloeser mit Spule (168) aufweist, die im Falle einer Ueberlast oder eines Kurzschlusses mit einem Riegel des Mechanismus zusammenarbeiten koennen zur automatischen Oeffnung der Kontakte,
und einen Nebenschlusskreis (66), der parallel auf dem Haupt-Ausloesekreis geschaltet ist, wobei der genannte Nebenschluss aus einem metallischen leitfaehigen Material besteht, der einen Teil des Nennstroms jedes Pols ableitet, waehrend der andere Teil in dem Bimetallstreifen (188) und der Spule (168) fliesst,

dadurch gekennzeichnet, dass der Nebenschlusskreis (66) aus einem Zwischenschirm (132) aus Metall besteht, der zwischen den beiden Loeschkammern (134, 136) angeordnet ist, wobei der genannte Schirm einen ersten Befestigungshaken (102) des Bimetallstreifens (188) traegt, und einen zweiten Haken (162), der mit einem der Enden der Spule (168) des elektromagnetischen Ausloesers verbunden ist.
6. Elektrischer Leistungsschalter gemaess Anspruch 5, dadurch gekennzeichnet, dass der erste Haken (102) des Schirms (132) in elektrischer Verbindung mit einer der Klemmen (128) ist, und dass der zweite Haken (162) elektrisch mit einem (146) der feststehenden Kontakte verbunden ist, waehrend der andere feststehende Kontakt (148) mit der entgegengesetzten Klemme (126) verbunden ist.
7. Elektrischer Leistungsschalter gemaess irgendeinem der vorhergehenden Ansprueche, dadurch gekennzeichnet, dass der Bimetallstreifen (30, 188) und die Spule (48, 168) des Haupt-Ausloesekreises in Serie oder parallel geschaltet sind.
EP19830401117 1982-06-07 1983-06-02 Nebenschlussstromkreis für den Auslöser eines Leistungsschalters Expired EP0097557B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209993 1982-06-07
FR8209993A FR2528230A1 (fr) 1982-06-07 1982-06-07 Circuit shunt du declencheur d'un disjoncteur electrique

Publications (2)

Publication Number Publication Date
EP0097557A1 EP0097557A1 (de) 1984-01-04
EP0097557B1 true EP0097557B1 (de) 1986-04-16

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ID=9274778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830401117 Expired EP0097557B1 (de) 1982-06-07 1983-06-02 Nebenschlussstromkreis für den Auslöser eines Leistungsschalters

Country Status (5)

Country Link
EP (1) EP0097557B1 (de)
DE (1) DE3363038D1 (de)
ES (1) ES8403240A1 (de)
FR (1) FR2528230A1 (de)
PT (1) PT76789B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1306913B1 (it) * 1998-12-15 2001-10-11 Gewiss Spa Interruttore elettrico magnetotermico da incasso

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1588513A1 (de) * 1967-12-19 1971-01-21 Licentia Gmbh Schaltungsanordnung fuer Selbstschalter in Schmalbauform
LU61958A1 (de) * 1970-10-29 1972-06-28
BE772520A (fr) * 1971-09-13 1972-01-17 Vynckier Belg Werkhuizen Stroomonderbrekingselement.
FR2434474A1 (fr) * 1978-08-24 1980-03-21 Legrand Sa Disjoncteur a reglage de calibre
FR2436491A1 (fr) * 1978-09-12 1980-04-11 Merlin Gerin Disjoncteur electrique multipolaire basse tension a blocs auxiliaires de commande

Also Published As

Publication number Publication date
DE3363038D1 (en) 1986-05-22
ES523000A0 (es) 1984-03-16
FR2528230B1 (de) 1985-02-22
ES8403240A1 (es) 1984-03-16
PT76789A (fr) 1983-06-01
PT76789B (fr) 1987-01-09
EP0097557A1 (de) 1984-01-04
FR2528230A1 (fr) 1983-12-09

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