EP0309382B1 - Kontaktanordnung eines Niederspannungs-Leistungsschalters mit elektrodynamischer Öffnung - Google Patents

Kontaktanordnung eines Niederspannungs-Leistungsschalters mit elektrodynamischer Öffnung Download PDF

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Publication number
EP0309382B1
EP0309382B1 EP88730198A EP88730198A EP0309382B1 EP 0309382 B1 EP0309382 B1 EP 0309382B1 EP 88730198 A EP88730198 A EP 88730198A EP 88730198 A EP88730198 A EP 88730198A EP 0309382 B1 EP0309382 B1 EP 0309382B1
Authority
EP
European Patent Office
Prior art keywords
contact lever
contact
carrier
lever
stop surface
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
EP88730198A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0309382A1 (de
Inventor
Martin Dipl.-Ing. Böttcher
Karl-Heinz Ing.(Grad.) Manthe
Bernhard Dr.-Ing. Pfeiffer
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0309382A1 publication Critical patent/EP0309382A1/de
Application granted granted Critical
Publication of EP0309382B1 publication Critical patent/EP0309382B1/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
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal

Definitions

  • the invention relates to a contact arrangement of a low-voltage circuit breaker with an electrodynamic opening, with a pivotably mounted contact lever carrier and a contact lever mounted thereon and pivotably mounted relative to this, and a compression spring which is supported on the contact lever carrier and the contact lever for biasing the contact lever into the closed position or after exceeding a dead center position of the contact lever with respect to the direction of action of the compression spring in an open position, further with an effective stop surface for a back surface of the contact lever in the open position of the contact lever and a further stop surface provided on the contact lever carrier for the closed position of the contact lever.
  • a contact arrangement of this type is known from GB-A-1 564 412.
  • the pivot bearing for the contact lever on the contact lever carrier has the shape of a hinge pin, as is also common with movable contact arrangements of low-voltage circuit breakers of a different type.
  • the invention has for its object the structure of the contact lever, the To simplify the contact lever carrier and the compression spring existing assembly to the extent that the assembly of these parts can be dispensed with using a complex assembly device and that a high degree of strength against the stresses is achieved when the contact lever is opened dynamically.
  • the pivot bearing of the contact lever on the contact lever carrier is formed by a pan-like recess of the contact lever carrier and an extension of the contact lever engaging in the recess, that the stop surface for the open position of the contact lever is arranged on the contact lever carrier and below is arranged at an acute angle to the stop surface for the closed position of the contact lever and that the stop surface for the open position of the contact lever and the pan-like depression are connected by a continuous transition surface, the contact lever between the extension and the back surface having a transition part adapted to the transition surface .
  • a pan-like mounting of a contact lever on a contact lever carrier is already known from FR-A-2 553 930.
  • the bearing is formed by the end of the contact lever and a corresponding prismatic recess in the contact lever carrier.
  • the extension of the contact lever enables the automatic engagement of the contact lever in the contact lever carrier.
  • the acute angle between the stop surface for the open position and the stop surface for the closed position gives the contact lever carrier an approximately funnel-like opening into which the contact lever is to be inserted for assembly.
  • the steady transition surface ensures that when the contact lever is inserted into the contact lever carrier it first comes into force-free engagement with the compression spring and then with its extension on the stop surface and slides along the transition surface, the compression spring being tensioned. Then the peg-like extension of the contact lever automatically passes into the pan-like recess of the contact lever carrier.
  • the continuous transition surface in conjunction with the adapted transition part of the contact lever ensures a flat contact in the end position with electrodynamically caused contact opening, as a result of which the stress on the interacting parts is advantageously low.
  • the contact lever carrier is a pocket-like part which is essentially open on one side.
  • a movable electrical connection of the contact lever to a stationary connection point is achieved by a current band which is attached to an extension of the contact lever and which is guided around the outside of the contact lever carrier in an arc.
  • both a shape of the contact lever carrier which is more favorable for the production and a configuration which is advantageous for the current band can be achieved in that the contact lever carrier near the pan-like depression on its side facing away from the stop faces for the passage of a current band connected to the contact lever Opening.
  • the contact lever carrier is given a rather frame-like shape with a through opening instead of the previous pocket-like shape.
  • the current band is thereby shorter and can be connected to the contact lever where a relatively small relative movement occurs.
  • FIG. 1 shows a side view of a contact arrangement according to the invention, a contact lever carrier being shown in section.
  • FIG. 2 shows a three-pole embodiment of a contact arrangement in a top view.
  • the contact arrangement of a low-voltage circuit breaker shown in FIG. 1 and designated as a whole by 1 has a contact lever 2 with a contact piece 3 located at its front end and a fixed, loop-shaped conductor 4 with a further contact 5.
  • the contact lever 2 is pivotally mounted in a contact lever carrier 6, the contact lever carrier 6 in turn being pivotally supported in a known manner in a circuit breaker housing, not shown.
  • the contact lever 2 is designed as a two-armed lever with lever parts 7 and 8, of which the lever part 7 provided with the contact piece 3 is formed substantially longer than the rear lever part 8, on which a flexible current band 11 is attached for connecting the contact lever 2 to a fixed connection point is.
  • the pivot bearing of the contact lever 2 is formed by a rounded extension 12 which engages in a pan-like recess 13 of the contact lever carrier 6 which is adapted to the rounding of the extension.
  • the contact lever carrier 6 has a bottom part 14, which serves as a relatively stationary abutment of a helical compression spring 15 which engages on the contact lever 2 by means of a pressure piece 16.
  • a pressure piece 16 To engage the pressure piece on the contact lever 2, its lever part 8 is provided with a suitable recess 17.
  • the compression spring 15 acts on the lever part 8 of the contact lever 2 in such a way that it strives to extend it 12 to perform a counterclockwise rotation. In this way, the contact force required to make contact between the contact pieces 3 and 5 is generated when the contact lever carrier 6 is biased counterclockwise. This is done by means of a conventional drive mechanism, for example formed from toggle levers 20 and 21, which engages on a bearing pin 22 passing through the contact lever carrier.
  • the contact lever 2 When the contact lever carrier 6 is in the unchanged position, the contact lever 2 can be moved by a relatively large swivel angle in that the contact lever carrier has a correspondingly dimensioned opening 23 which is delimited by stop faces 24 and 25.
  • a lower edge 10 of the contact lever 2 In the switch-on position shown, a lower edge 10 of the contact lever 2 is raised from the lower stop surface 24, as a result of which the compression spring 15 is effective for generating the contact force between the contact pieces 3 and 5.
  • the contact lever 2 In the open position shown in dashed lines, the contact lever 2 comes under the influence of electrodynamic forces which arise between the lever part 7 and the loop-shaped conductor 4 at a sufficiently high current.
  • the contact lever 2 is thrown away by the conductor 4, the direction of action of the compression spring 15 passing through a dead center position with respect to the bearing point formed by the extension 12 and the recess 13 and then being effective in the sense of the further opening of the contact lever 2.
  • the contact lever 2 then rests with a back surface 26 of the lever part 7 on the stop surface 25 of the contact lever carrier 6.
  • a continuously extending transition surface 27 is provided between the stop surface and the recess 13 of the contact lever support 6 and the contact lever 2 between the extension 12 and the back surface 26 has a correspondingly shaped transition part 30, there is a relatively large-area contact between the contact lever 2 and the contact lever carrier 6 and thus to an advantageously low mechanical stress during the electrodynamic opening process.
  • a current band 11 is fastened to the lever part 8 of the contact lever 2. This extends through a rear opening 31 of the contact lever carrier 6 and is in a favorable position with respect to the bearing of the contact lever 2 formed by the extension 12 and the recess 13. Furthermore, the current band 11 is so far away from the contacts 3 and 5 that an adverse effect of the heat of an arc is excluded.
  • the contact lever carrier 6 Due to the arrangement of the openings 23 and 31, the contact lever carrier 6 has an approximately frame-like shape, the contact lever 2 being accommodated between side walls 32.
  • the rear of the two side walls 32 is visible due to the selected sectional view.
  • These side walls 32 are connected by two cross legs 33 and 34, of which the upper cross leg 33 has the stop surface 25 and the transition surface 27 and the recess 13 and the cross leg 34 has the stop surface 24 and the bottom part 14.
  • FIG. 2 according to the number of poles of a switching device, several contact lever carriers 6 with shaft-like sections 35 can form a multi-pole switching shaft 36 connected, which is pivotally mounted in the housing of a switching device.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP88730198A 1987-09-23 1988-09-05 Kontaktanordnung eines Niederspannungs-Leistungsschalters mit elektrodynamischer Öffnung Expired - Lifetime EP0309382B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873732468 DE3732468A1 (de) 1987-09-23 1987-09-23 Kontaktanordnung eines niederspannungs-leistungsschalters mit elektrodynamischer oeffnung
DE3732468 1987-09-23

Publications (2)

Publication Number Publication Date
EP0309382A1 EP0309382A1 (de) 1989-03-29
EP0309382B1 true EP0309382B1 (de) 1993-07-14

Family

ID=6336942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730198A Expired - Lifetime EP0309382B1 (de) 1987-09-23 1988-09-05 Kontaktanordnung eines Niederspannungs-Leistungsschalters mit elektrodynamischer Öffnung

Country Status (3)

Country Link
US (1) US4845459A (it)
EP (1) EP0309382B1 (it)
DE (2) DE3732468A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137506C1 (de) * 2001-07-26 2002-08-08 Siemens Ag Schaltkontaktanordnung für einen elektrischen Schalter

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5023416A (en) * 1989-10-03 1991-06-11 Fuji Electric Co., Ltd. Circuit breaker
DE4103584A1 (de) * 1990-02-09 1991-08-22 Fuji Electric Co Ltd Schalter
DE4211916A1 (de) * 1992-04-09 1993-10-14 Abb Patent Gmbh Installationsgerät
FR2703824B1 (fr) * 1993-04-07 1995-05-12 Merlin Gerin Disjoncteur limiteur multipolaire à répulsion électrodynamique.
US5363076A (en) * 1993-04-28 1994-11-08 Square D Company Circuit breaker having spring biased blade suspension
DE4416104C2 (de) * 1994-04-19 2000-07-13 Siemens Ag Schaltkontaktanordnung eines elektrischen Leistungsschalters
US5844188A (en) * 1996-12-19 1998-12-01 Siemens Energy & Automation, Inc. Circuit breaker with improved trip mechanism
IT1289482B1 (it) * 1996-12-20 1998-10-15 Sace Spa Interruttore di corrente con contatti movibili
US5874699A (en) * 1997-09-18 1999-02-23 Eaton Corporation Molded case circuit breaker and moving conductor assembly therefor
DE10144105C1 (de) * 2001-09-03 2003-04-17 Siemens Ag Schaltkontaktanordnung mit einer in Schließrichtung und in Öffnungsrichtung wirkenden Federkraft
US6747532B1 (en) 2002-12-23 2004-06-08 General Electric Company Method, system and apparatus for employing neutral poles in multipole circuit breakers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1564412A (en) * 1977-09-15 1980-04-10 Dorman Smith Switchgear Ltd Electric circuit breakers
FR2553930B1 (fr) * 1983-10-21 1986-05-09 Merlin Gerin Mecanisme reversible de commande d'un disjoncteur limiteur multipolaire
US4635011A (en) * 1985-05-01 1987-01-06 Westinghouse Electric Corp. Circuit breaker with arm latch for high interrupting capacity
US4642431A (en) * 1985-07-18 1987-02-10 Westinghouse Electric Corp. Molded case circuit breaker with a movable electrical contact positioned by a camming spring loaded clip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137506C1 (de) * 2001-07-26 2002-08-08 Siemens Ag Schaltkontaktanordnung für einen elektrischen Schalter

Also Published As

Publication number Publication date
DE3882318D1 (it) 1993-08-19
DE3732468A1 (de) 1989-04-06
EP0309382A1 (de) 1989-03-29
US4845459A (en) 1989-07-04

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