EP0375087A1 - Dispositif de contact avec pivot conducteur pour un levier de contact - Google Patents

Dispositif de contact avec pivot conducteur pour un levier de contact Download PDF

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Publication number
EP0375087A1
EP0375087A1 EP89250111A EP89250111A EP0375087A1 EP 0375087 A1 EP0375087 A1 EP 0375087A1 EP 89250111 A EP89250111 A EP 89250111A EP 89250111 A EP89250111 A EP 89250111A EP 0375087 A1 EP0375087 A1 EP 0375087A1
Authority
EP
European Patent Office
Prior art keywords
contact
legs
contact lever
lever
pivot bearing
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
EP89250111A
Other languages
German (de)
English (en)
Other versions
EP0375087B1 (fr
Inventor
Bernard Dimarco
Steven Alan Kaufman
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 EP0375087A1 publication Critical patent/EP0375087A1/fr
Application granted granted Critical
Publication of EP0375087B1 publication Critical patent/EP0375087B1/fr
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
    • 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
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal

Definitions

  • the invention relates to a contact arrangement with a pivotably mounted contact lever and a busbar carrying a current-carrying pivot bearing for the contact lever, the pivot bearing comprising at least two mutually angled legs and a bearing pin with at least one cylindrical bearing pin resting on the legs under the force of a spring .
  • a contact arrangement of this type is known from US-A-4,554,427.
  • the contact lever forms the stationary counter-contact of a likewise pivotably mounted contact lever, which can be moved arbitrarily by a drive mechanism of the circuit breaker or as a function of automatic triggers for switching the circuit breaker on and off.
  • An independent of the drive mechanism and the triggers opening of the contact lever comes under the influence of very high currents, such as occur in particular in the event of a short circuit, in that the contact lever connected to the drive mechanism and the contact lever mounted on the busbar under the influence of a electrodynamic loop force are separated.
  • FIG. 7 illustrates the generation of the contact-lifting forces using the example of two contact parts 1 and 2 which are in butt contact.
  • the object of the invention is to design a current-carrying pivot bearing in such a way that the contact-lifting forces are as low as possible and therefore a good current transfer is ensured with a comparatively low spring force.
  • a separate contact force spring for the joint arrangement can be omitted according to a further development of the invention if the legs of the pivot bearing are formed by a hook-like bend at one end of the busbar and if the opening between the legs arranged at an acute angle to one another is aligned approximately with the longitudinal direction of the contact lever.
  • a single spring can provide both the contact force which is required for interaction with the further contact lever actuated by the drive mechanism of the circuit breaker and the pressing force of the contact lever against its pivot bearing.
  • This spring can be designed as a tension spring which is stretched between a fixed abutment provided near the joint arrangement and an abutment arranged on the contact lever.
  • the contact lever has an opening for receiving the bearing pin with two essentially flat and angled boundary surfaces. In this way, a good current transfer is ensured between the contact lever and the bearing pin due to the wedge-shaped interaction by forming two contact areas in a similar manner as between the bearing pin and the legs which are at an acute angle to one another.
  • FIG. 1 shows a low-voltage circuit breaker of compact design with an insulating housing (MCCB), partially broken open and partially in section, which contains a contact arrangement according to the invention.
  • MCCB insulating housing
  • Figures 2 and 3 show a side view and a top view of a stationary busbar and a pivoted contact lever. Details of the contact arrangement according to FIGS. 2 and 3 are also shown in a side view in FIG. 4.
  • FIG. 5 shows a hook-like bend at the inner end of a busbar shown in FIGS. 2, 3 and 4 to illustrate the forces that occur during power transmission.
  • FIG. 6 shows the end region of a contact lever on the bearing side.
  • FIG. 7 serves to illustrate the development of current-dependent contact-lifting forces.
  • a low-voltage circuit breaker 10 shown in FIG. 1 is partially broken open and shown in section so that part of a drive mechanism and the contact system of a pole can be seen, which comprises contact levers 12 and 14.
  • the contact lever 12 can be pivoted arbitrarily by the drive mechanism upon actuation of a handle 11 for switching on and off.
  • the contact lever 12 can also be brought into the switch-off position by a trigger in a manner which is not shown in detail, but is generally known.
  • a drive mechanism 18 is indicated in FIG. 1 and can comprise, in a known manner, a toggle lever system, at least one over-center spring and latching parts.
  • FIG. 2 illustrates two positions of the contact lever 14, which can be pivoted about a bearing pin 28. Both contact levers 12 and 14 each carry a contact pad 16 for the current transfer, so that there is an overall loop-shaped current path. If a sufficient current flows through the current path, as occurs in the event of a short circuit, then the contact lever 14, under the influence of the loop force and the current-dependent forces already explained with reference to FIG. 7, passes between the contact pads 16 from the rest position shown in the broken line shown withdrawal position.
  • tension springs 20 which are arranged on both sides of the contact lever 14 according to FIG. 3.
  • the tension springs 20 are suspended on the one hand on a pin 22 which passes through the contact lever 14 approximately in the middle.
  • the opposite end of each of the tension springs 20 engages a fixed abutment 24, which is part of a stop body 26.
  • the stop body 26 has two lugs 30 against which the pin 22 bears under the action of the tension springs 20 when the contact lever 12 (FIG. 1) is raised by the contact lever 14. 4, the stop body 26 is fastened to the busbar 34 by means of a rivet 32.
  • the busbar 34 is forked by an incision, the fork ends 36 being bent like hooks to form legs 37 and 38.
  • the inner surfaces 40 and 42 of the legs 37 and 38 are at an angle of approximately 30 °, the opening between the legs being oriented approximately to the longitudinal direction of the contact lever 14, as FIGS. 2 and 4 show.
  • the contact lever 14 rests between the fork ends 36 with an end part 39, as can be seen in particular from FIG. 3.
  • the end part 39 has an opening 43 which has two boundary surfaces 44 and 46 inclined at an angle of approximately 15 ° to one another.
  • a bearing pin 28 extends through the opening 43, the ends of which engage as bearing pins in the fork ends 36 of the busbar 34.
  • the contact lever 14 with the boundary surfaces 44 and 46 is thus pressed in a wedge-like manner against the central region of the bearing pin 28, as a result of which in turn the bearing pin 28 is placed against the inner surfaces 40 and 42 of the legs 37 and 39 of the busbar 34.
  • the spacing of the abutment 24 from the axis of the bearing pin 28 also causes the contact lever 14 to be pretensioned into the position which is shown in extended form in FIG.
  • the contact areas 48 and 50 shown in FIG. 6 between the bearing pin 28 and the boundary surfaces 44 and 46 of the opening 43 in the end part 39 and two contact areas 52 and 54 each represent the current transfer from the contact lever 14 to the busbar 34 (FIG. 5 ) is available at each end of the bearing pin 28 and the associated fork end 36. Due to the wedge-like interaction of the parts and the pressure force provided by the tension springs 20, these six contact areas allow a safe current transfer.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP89250111A 1988-12-16 1989-12-08 Dispositif de contact avec pivot conducteur pour un levier de contact Expired - Lifetime EP0375087B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US285479 1988-12-16
US07/285,479 US5361051A (en) 1988-12-16 1988-12-16 Pivoting circuit breaker contact arm assembly

Publications (2)

Publication Number Publication Date
EP0375087A1 true EP0375087A1 (fr) 1990-06-27
EP0375087B1 EP0375087B1 (fr) 1993-10-27

Family

ID=23094415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250111A Expired - Lifetime EP0375087B1 (fr) 1988-12-16 1989-12-08 Dispositif de contact avec pivot conducteur pour un levier de contact

Country Status (3)

Country Link
US (1) US5361051A (fr)
EP (1) EP0375087B1 (fr)
DE (1) DE58906028D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29505890U1 (de) * 1995-04-05 1995-06-01 Heinrich Kopp Ag, 63796 Kahl Kontaktanordnung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5502428A (en) * 1995-03-30 1996-03-26 Siemens Energy & Automation Inc. Circuit breaker with one-piece crossbar including an integrally molded operating arm
US7718908B2 (en) * 2008-10-01 2010-05-18 General Electric Company Contact arm assembly and method for assembling the contact arm assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402274A (en) * 1965-10-01 1968-09-17 Square D Co Contact structure for a power circuit breaker
GB2033158A (en) * 1978-10-16 1980-05-14 Westinghouse Electric Corp Circuit interrupter contact arm pivot
EP0146805A2 (fr) * 1983-12-19 1985-07-03 Westinghouse Electric Corporation Disjoncteur avec structure d'un contact

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345485A (en) * 1964-12-30 1967-10-03 Fed Pacific Electric Co Circuit breaker having improved arcing contact structure
US3562680A (en) * 1969-09-17 1971-02-09 Fuji Electric Co Ltd Circuit breaker
US3663903A (en) * 1971-05-20 1972-05-16 Ite Imperial Corp Tripping system for circuit breaker
US3958197A (en) * 1975-01-24 1976-05-18 I-T-E Imperial Corporation High interrupting capacity ground fault circuit breaker
CH631027A5 (de) * 1978-06-30 1982-07-15 Bbc Brown Boveri & Cie Elektrische gleichstromkontaktvorrichtung.
US4259651A (en) * 1978-10-16 1981-03-31 Westinghouse Electric Corp. Current limiting circuit interrupter with improved operating mechanism
US4458224A (en) * 1982-04-20 1984-07-03 Siemens-Allis, Inc. Current-limiting circuit breaker adapter
US4488133A (en) * 1983-03-28 1984-12-11 Siemens-Allis, Inc. Contact assembly including spring loaded cam follower overcenter means
US4484164A (en) * 1983-03-28 1984-11-20 Siemens-Allis, Inc. Braidless movable contact with wiping action
US4528531A (en) * 1983-12-19 1985-07-09 Westinghouse Electric Corp. Molded case circuit breaker with improved operating mechanism
US4594567A (en) * 1984-09-28 1986-06-10 Siemens-Allis, Inc. Circuit breaker contact arm assembly having a magnetic carrier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402274A (en) * 1965-10-01 1968-09-17 Square D Co Contact structure for a power circuit breaker
GB2033158A (en) * 1978-10-16 1980-05-14 Westinghouse Electric Corp Circuit interrupter contact arm pivot
EP0146805A2 (fr) * 1983-12-19 1985-07-03 Westinghouse Electric Corporation Disjoncteur avec structure d'un contact

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29505890U1 (de) * 1995-04-05 1995-06-01 Heinrich Kopp Ag, 63796 Kahl Kontaktanordnung

Also Published As

Publication number Publication date
DE58906028D1 (de) 1993-12-02
US5361051A (en) 1994-11-01
EP0375087B1 (fr) 1993-10-27

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