EP0213979A1 - Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist - Google Patents

Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist Download PDF

Info

Publication number
EP0213979A1
EP0213979A1 EP86401474A EP86401474A EP0213979A1 EP 0213979 A1 EP0213979 A1 EP 0213979A1 EP 86401474 A EP86401474 A EP 86401474A EP 86401474 A EP86401474 A EP 86401474A EP 0213979 A1 EP0213979 A1 EP 0213979A1
Authority
EP
European Patent Office
Prior art keywords
tail
bimetallic strip
coil
foot
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.)
Granted
Application number
EP86401474A
Other languages
English (en)
French (fr)
Other versions
EP0213979B1 (de
Inventor
William Bartolo
Louis Boillot
René Challande
Patrick De Robertis
Jacky Duchenaud
Jean-Claude Ramaciotti
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
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Priority to AT86401474T priority Critical patent/ATE57445T1/de
Publication of EP0213979A1 publication Critical patent/EP0213979A1/de
Application granted granted Critical
Publication of EP0213979B1 publication Critical patent/EP0213979B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H71/40—Combined electrothermal and electromagnetic 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2481—Electromagnetic mechanisms characterised by the coil design

Definitions

  • thermomagnetic trip device associated with a mechanism for opening a miniature circuit breaker with molded insulating housing, comprising: - a first bimetal thermal trip device sensitive to overload currents, a second electromagnetic trip device for protection against short-circuit currents, comprising an electromagnet with a control coil, constituted by helical winding of a deformable conductor having a predetermined stiffness, - And a device for adjusting the thermal trigger threshold of the first trigger.
  • one of the ends of the coil is connected to the head of the bimetallic strip by a connecting braid.
  • the foot of the bimetallic strip is generally carried by a metal support connected to an electrode for guiding the arc and to the contact pad of the pole.
  • the braid connects the thermal trip unit and the electromagnetic trip unit in series.
  • the metal support cooperates by deformation with a screw for adjusting the thermal trigger threshold, so as to cause a variation in the transverse spacing of the head of the bimetallic strip with the trigger bar of the mechanism.
  • the bimetallic strip is directly heated, since the current flows over its entire length. The industrial production of such a thermomagnetic trip device is complicated.
  • the object of the invention is to improve the setting of a thermomagnetic trip device for a circuit breaker, and to reduce its manufacturing cost.
  • the trigger according to the invention is characterized in that the coil of said electromagnet is extended by a tail, arranged as an adjustable support member for the bimetallic strip, the foot of the latter being inserted by welding between said tail and a connecting means electric with a contact pad, to cause the current to flow in the thickness direction of the bimetallic foot and that the tail has a hinge between the junction point of the bimetallic foot and the coil, so as to allow a relative displacement of a part of said tail under the action of the device for adjusting the thermal trip threshold, the other part, connected to the coil remaining substantially stationary.
  • tail of the electromagnet coil as a bimetal support allows the removal of the connecting braid between the coil and the head of the bimetallic strip, and the removal of any special element supporting the foot of the bimetallic strip. In normal operation of the circuit breaker, the heating of the coil due to the passage of current from the pole can reach 90 degrees.
  • the hinge is formed by a reduced section area allowing mechanical deformation of said shank, during the screwing or unscrewing of a screw of said adjusting device.
  • the presence of the hinge makes it possible to deform the tail of the coil for adjusting the thermal trigger threshold, without any transmission of forces to the frame of the electromagnet.
  • the electromagnetic trigger threshold of the second trigger remains invariable, when the first trigger is adjusted.
  • the end of the tail is housed in a positioning cage, cooperating with the screw of the device for adjusting the thermal trigger threshold.
  • the tail and adjustment device assembly is carried by a metal bracket or fixed flange, positioned in a cell of the insulating housing.
  • the stirrup is equipped with an extension serving as a support for said part of the tail, arranged between the hinge and the coil.
  • the screw plays through two guide holes in the U-shaped stirrup, in a direction perpendicular to the end of the tail.
  • the increase or decrease in the thermal tripping threshold is effected by screwing or unscrewing the adjusting screw.
  • the hinge axis of articulation comprises a needle or pivot cooperating with the reduced section area of the tail.
  • the means of electrical connection between the foot of the bimetallic strip and the corresponding contact pad comprises a conductive lever, extending near the bimetallic strip, so as to constitute a combined indirect heating member, by radiation from the bimetallic strip, and transmission of the thermal threshold adjustment torque by the screw.
  • FIG. 1 shows a magneto-thermal trip device 10 incorporated in a pole of a miniature circuit breaker with insulating casing 11, between the arc quenching chamber 12 and the control mechanism (not shown).
  • the magnetothermal trip device 10 comprises a first bimetal thermal trip device 14, sensitive to overload currents and a second electromagnetic trip device with electromagnet 16 for protection against short-circuits.
  • the arc extinguishing chamber 12 is constituted by a stack of parallel plates 18 for deionizing the arc, and the control mechanism is of the type described in French Patent No. 2,344,949 to which reference will advantageously be made for more details.
  • the fixed contact 26 is carried by a conductive bar acting as a lower arc horn 30, and the movable contact 28 is arranged at the end of a tilting contact arm 32, actuated by the mechanism.
  • the electromagnet 16 of the electromagnetic trip device comprises a coil 34 surrounded by a metal carcass 36, and a magnetic plunger core mounted to slide axially in the cylindrical coil 34 whose axis is parallel to the sheets 18.
  • the plunger core carries at one of its ends an extractor 38 acting on the contact arm 32, and on the opposite actuates a pusher 40 for unlocking the trigger bar 20.
  • One of the connection ends of the coil 34 located on the side of the extractor 38, is electrically connected to an electrode 42 forming the upper arc horn which frames the chamber 12 with the opposite bar of the lower arc horn 30.
  • the operation of such a trigger magnetothermal is well known to specialists.
  • the coil 34 of the electromagnetic trip device comprises a few contiguous turns formed after helical winding of a deformable conductor, in particular made of copper coated with an insulating coating.
  • the terminal turn 43 located on the side of the trigger bar 20, opposite the extractor 38 is extended by a tail 44 serving as a support member for the bimetallic strip 14, in the form of an elongated blade.
  • the conductor constituting the turns and the tail 44 has a uniform section arranged to give a certain rigidity to the coil 34.
  • the tail 44 of the coil 34 is substantially rectilinear, and extends in an oblique direction towards the exhaust orifice 46 located at the outlet of the arc extinguishing chamber 12.
  • the foot 48 of the bimetallic strip 14 is fixed by welding at an intermediate point 49 of a stripped part of the tail 44, so as to allow a good heat transfer from the coil 34 to the bimetallic strip 14.
  • Direct welding of the bimetallic strip 14 on the tail 44 makes it possible to dispense with a flexible braid for electrical connection between the coil and the bimetallic strip, as well as a special metallic device for supporting the bimetallic strip.
  • the end 50 of the tail 44 cooperates with an adjustment device 52 of the thermal tripping threshold of the bimetallic strip 14.
  • the adjustment device 52 shown in detail in FIGS. 2 and 3, comprises a screw 54 inserted in an inclined orifice 56 of the insulating housing 11, and screwed into a threaded hole 57 of a 58-shaped positioning cage 58.
  • the end 50 of the tail 44 is housed in the cage 58 such that the screwing or unscrewing of the adjusting screw 54 causes a slight deformation of the tail 44, causing a relative displacement of the free end of the bimetallic strip 14 in approach or at a distance from the trigger bar 20.
  • the tail 44 of the coil 34 is advantageously provided with a reduced section notch forming a hinge 60, arranged between the point 49 of junction of the bimetallic strip 14 and the end turn 43.
  • the tail 44 and adjustment device 52 assembly is carried by a stirrup 62 or fixed flange positioned in a cell 64 of the housing 11.
  • the upper 66 and lower 67 parallel branches of the stirrup 62 include slots 68, aligned in guide, for the passage of clearance of the screw 54.
  • the screw head 54 bears on the external face of the upper branch 66, while the lower branch 67 is extended by an extension 70, secured by welding to the tail 44 in the vicinity of the hinge 60.
  • the latter is advantageously located between the point 72 of mechanical junction of the extension 70 with the tail 44, and the cage 58 for positioning the end 50.
  • the screw 54 extends perpendicularly at the end 50 of the tail 44.
  • the positioning cage 58 moves in alternating translation inside the fixed stirrup 62, and causes a slight pivoting of the end 50 of the tail 44 around the hinge 60.
  • the other rigid part of the tail 44 located between the hinge 60 and the terminal turn 43 remains stationary during adjustment, thanks to the effective maintenance of the extension 70 of the stirrup 62 for fixing.
  • the stirrup 62 and the cage 58 for positioning the end 50 are made of a non-deformable metallic material of high mechanical strength, in particular steel, and having an electrical resistivity greater than that of the conductor of the tail 44.
  • a connecting braid 76 is welded to the foot 48 of the bimetallic strip 14, and is connected to a connection pad (not shown). The current flowing in the coil 34 from the range passes through the foot 48 of the bimetallic strip 14 in the thickness direction. The deflection of the bimetallic strip 14 results essentially from the heat conduction by the tail 44 of the coil 34.
  • the same reference numbers designate parts that are identical or similar to those of FIG. 1.
  • the end 50 of the tail 44 is welded directly to one of the sides of the foot 48 of the bimetallic strip 14, while a lever 80 for adjusting the thermal threshold is fixed by welding to the opposite side of the foot 48.
  • a connecting braid 82 connects the metallic lever 80 to a contact pad 84 associated with a terminal for connecting the pole.
  • the pole current flows in the tail 44 of the coil 34 and in the lever 80 after crossing the foot 48 of the bimetallic strip 14 in its thickness.
  • the rest of the bimetallic strip 14 is not traversed by the current.
  • the triple weld at the foot 48 makes it possible to guarantee excellent consistency between the intensity of the pole current and the thermal trigger threshold.
  • the deflection of the bimetallic strip 14 results from both the heat conduction, following the heating of the coil 34, the partial direct heating by passage of the current through the foot 48, and the indirect heating by thermal radiation from the lever 80.
  • the adjustment lever 80 conducts the current between the foot 48 of the bimetallic strip 14 and the braid 82 in connection with the pad 84.
  • the lever 80 serves as a heater for the bimetallic strip 14, and the material of the lever 80 is chosen to adjust the indirect heating by radiation.
  • the transmission of the adjustment torque by the lever 80 is effected by the screw 54 which causes the foot 48 of the bimetallic strip 14 to pivot slightly around the axis of rotation of the hinge 60. According to FIGS. 4 and 5, the axis is real, and has a needle 86 or pivot to the right of the narrowed section 88 of the tail 44. Stops 90 formed by ribs of the insulating housing 11 ensures the stable maintenance of the tail 44, and prevents any transmission of mechanical forces to the carcass 36 of the coil 34.
  • the axis of rotation of the hinge is fictitious, and is constituted by the projecting edge of a stop 92 bearing on the end 50 of the tail 44. Between the two stops 90, 92, is finds the deformable zone with a narrowed section 88, intended to absorb any lateral displacement towards the coil 34.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Electric Clocks (AREA)
EP86401474A 1985-07-31 1986-07-03 Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist Expired - Lifetime EP0213979B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401474T ATE57445T1 (de) 1985-07-31 1986-07-03 Magnetothermischer ausloeser der dem mechanismus eines miniaturschalters mit isoliergehaeuse zugeordnet ist.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511839 1985-07-31
FR8511839A FR2585877B1 (fr) 1985-07-31 1985-07-31 Declencheur magnetothermique associe au mecanisme d'un disjoncteur miniature a boitier isolant

Publications (2)

Publication Number Publication Date
EP0213979A1 true EP0213979A1 (de) 1987-03-11
EP0213979B1 EP0213979B1 (de) 1990-10-10

Family

ID=9321898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401474A Expired - Lifetime EP0213979B1 (de) 1985-07-31 1986-07-03 Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist

Country Status (5)

Country Link
EP (1) EP0213979B1 (de)
AT (1) ATE57445T1 (de)
DE (1) DE3674867D1 (de)
FR (1) FR2585877B1 (de)
ZA (1) ZA865159B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309197A1 (de) * 1993-03-22 1994-09-29 Maier & Cie C Leitungsschutzschalter
EP1096529A1 (de) * 1999-10-29 2001-05-02 Moeller GmbH Elektrisches Schutzschaltgerät
CN100377270C (zh) * 2005-12-07 2008-03-26 上海电器科学研究所（集团）有限公司 热磁式脱扣器及其电流调节旋钮
CZ300253B6 (cs) * 2005-08-15 2009-04-01 Oez S. R. O. Serizovací ústrojí, zvlášte pro tepelnou spoušt elektrického spínacího prístroje

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597445C (de) * 1928-07-25 1934-05-25 Schiele & Bruchsaler Industrie UEberstromausloeser fuer elektrische Schalter
DE1463684A1 (de) * 1964-11-17 1969-03-06 Stotz Kontakt Gmbh Installationsselbstschalter mit thermischem und magnetischem Ausloeser
FR2262396A1 (de) * 1974-02-27 1975-09-19 Ottermill Ltd
FR2344949A1 (fr) * 1976-03-15 1977-10-14 Merlin Gerin Disjoncteur miniature basse tension
EP0007283A1 (de) * 1978-06-23 1980-01-23 Merlin Gerin Selbstschalter mit einer lösbar befestigten Auslöseeinheit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597445C (de) * 1928-07-25 1934-05-25 Schiele & Bruchsaler Industrie UEberstromausloeser fuer elektrische Schalter
DE1463684A1 (de) * 1964-11-17 1969-03-06 Stotz Kontakt Gmbh Installationsselbstschalter mit thermischem und magnetischem Ausloeser
FR2262396A1 (de) * 1974-02-27 1975-09-19 Ottermill Ltd
FR2344949A1 (fr) * 1976-03-15 1977-10-14 Merlin Gerin Disjoncteur miniature basse tension
EP0007283A1 (de) * 1978-06-23 1980-01-23 Merlin Gerin Selbstschalter mit einer lösbar befestigten Auslöseeinheit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309197A1 (de) * 1993-03-22 1994-09-29 Maier & Cie C Leitungsschutzschalter
EP1096529A1 (de) * 1999-10-29 2001-05-02 Moeller GmbH Elektrisches Schutzschaltgerät
CZ300253B6 (cs) * 2005-08-15 2009-04-01 Oez S. R. O. Serizovací ústrojí, zvlášte pro tepelnou spoušt elektrického spínacího prístroje
CN100377270C (zh) * 2005-12-07 2008-03-26 上海电器科学研究所（集团）有限公司 热磁式脱扣器及其电流调节旋钮

Also Published As

Publication number Publication date
FR2585877A1 (fr) 1987-02-06
DE3674867D1 (de) 1990-11-15
ZA865159B (en) 1987-02-25
FR2585877B1 (fr) 1987-10-23
ATE57445T1 (de) 1990-10-15
EP0213979B1 (de) 1990-10-10

Similar Documents

Publication Publication Date Title
US4714907A (en) Miniature electrical circuit breaker with multiple moving contacts and thermomagnetic trip release
FR2553932A1 (fr) Fusible a retard
EP2333805B1 (de) Ferngesteuerte Unterbrechungsvorrichtung, und mit dieser Unterbrechungsvorrichtung ausgestattete Stromverteilungsvorrichtung
EP0143022B1 (de) Thermischer und magnetischer Auslöser für Selbstschalter
EP0213979B1 (de) Magnetothermischer Auslöser der dem Mechanismus eines Miniaturschalters mit Isoliergehäuse zugeordnet ist
EP2411995B1 (de) Magnetothermischer auslöser
FR2607964A1 (fr) Ensemble de declenchement magnetique a effet thermique pour disjoncteurs en boitier moule
EP0768692B1 (de) Autoexpansionsschalter mit Isoliergas
FR2527884A1 (fr) Thermostat
EP2333804B1 (de) Schalvorrichtung mit einer Kontaktverschweissungsanzeige
JPH1116476A (ja) 回路遮断器
EP1282146B1 (de) Lichtbogenlöschvorrichtung
EP0232637B1 (de) Elektrischer Kleinschalter mit Mehrfachkontakt
FR2553928A1 (fr) Bilame a chauffage mixte pour declencheur thermique d'un appareil de coupure
EP0515292B1 (de) Elektromagnetischer Auslöser für einen Schwachstromschalter
EP2743959B1 (de) Thermische Auslösvorrichtung und Schutzschalter mit dieser Vorrichtung
EP1505619B1 (de) Verbessertes Schlossmechanismus für Schutzschalter und Schutzschalter mit solchem Schloss
EP3161850B1 (de) Thermisch-magnetischer auslösungsmechanismus
EP2065913B1 (de) Vorrichtung zur thermischen Auslösung für elektrisches Gerät zum Leitungsschutz
FR2953979A1 (fr) Dispositif de coupure avec circuit magnetique de renforcement
EP0097557B1 (de) Nebenschlussstromkreis für den Auslöser eines Leistungsschalters
FR2772980A1 (fr) Dispositif de declenchement magneto-thermique et disjoncteur equipe de ce dispositif
FR2553931A1 (fr) Bobine de commande d'un declencheur electromagnetique de disjoncteur
FR2953986A1 (fr) Dispositif de coupure a indicateur de soudure des contacts
FR2567323A1 (fr) Disjoncteur electrique miniature a contacts multiples

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE GB IT LI SE

17P Request for examination filed

Effective date: 19870821

17Q First examination report despatched

Effective date: 19891213

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE GB IT LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19901010

Ref country code: AT

Effective date: 19901010

REF Corresponds to:

Ref document number: 57445

Country of ref document: AT

Date of ref document: 19901015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3674867

Country of ref document: DE

Date of ref document: 19901115

ITF It: translation for a ep patent filed

Owner name: EUROPATENT S.A.S.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910624

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910730

Year of fee payment: 6

ITTA It: last paid annual fee
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910830

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910904

Year of fee payment: 6

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19920731

Ref country code: CH

Effective date: 19920731

Ref country code: BE

Effective date: 19920731

BERE Be: lapsed

Owner name: MERLIN GERIN

Effective date: 19920731

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920703

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050703