US3663906A - Electric circuit breaker with magnetically assisted closing means - Google Patents

Electric circuit breaker with magnetically assisted closing means Download PDF

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Publication number
US3663906A
US3663906A US865046A US3663906DA US3663906A US 3663906 A US3663906 A US 3663906A US 865046 A US865046 A US 865046A US 3663906D A US3663906D A US 3663906DA US 3663906 A US3663906 A US 3663906A
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United States
Prior art keywords
closing
latch
force
movable contact
circuit breaker
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US865046A
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English (en)
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Philip Barkan
Klaus M Skreiner
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General Electric Co
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General Electric Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • 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

  • This invention relates to an electric circuit breaker and, more particularly, relates to a circuit breaker that includes electromagnetic means for opposing the magnetic contactrepulsion forces developed when a high current flows through the circuit breaker.
  • This type of circuit breaker is referred to hereinafter as a circuit breaker with magnetically assisted closing means.
  • An objectof our invention is to provide a circuit breaker which can be closed against. short-circuit currents by a small and relatively weak closing mechanism and mechanism-operator.
  • the closing cam 70 that is present is used for driving part of the closing linkage, but not the movable contact, into a predetermined position; and this motion trips a latch 28 which allows the closing spring 24 to drive the movable contact into closed position.
  • Another object of the present invention is to provide a magnetically assisted closing mechanism in which the speed of the movable contact is controlled by speed-modifying means such as the closing cam of the usual trip-free closing mechanism.
  • Another object is to reduce the magnetic forces transmitted to the trip-free mechanism of the breaker and, more specifically, to transmit substantially all magnetic forces directly to a stationary supporting frame through a path that effectively bypasses the trip-free mechanism.
  • Still another object is to provide a magnetically assisted closing mechanism for a plurality of movable contacts which readily lends itself to the use of a rigid linkage at ground potential for coupling the contacts together to assure synchronized movement of the contacts.
  • Still another object is to attain each of the above objects with magnetic means that can provide a high closing force for assisting in closing the circuit breaker and holding it closed when desired, but yet does not significantly increase the force required for opening the breaker when such opening is desired.
  • This assist means comprises a substantially rigid support 5 member which when restrained in a fixed position renders the assist means capable of transmitting closing force to the movable contact but which, when released, renders said asist means generally ineffective to transmit closing force to said movable contact.
  • Releasable latching means restrains the sup port member in said fixed position when the contacts are engaged.
  • Releasing means responsive to travel of the operating member in an opening direction releases the latching means prior to disengagement of the contacts during an opening operation.
  • Restoring means operable following separation of the contacts and completion of an interrupting operation is provided for restoring the latching means to restraining relationship with said support member before the contacts engage during a subsequent closing operation.
  • FIG. 1 is a side elevational view of a circuit breaker embodying one form of our invention. The circuit breaker is shown in its fully closed position.
  • FIG. 2 shows the circuit breaker of FIG. 1 in an intermediate position through which it passes during an opening operation.
  • FIG. 3 shows the breaker of FIG. 1 in another intermediate position through which it passes at a later stage of an opening operation.
  • FIG. 4 shows the circuit breaker in its fully open position.
  • FIG. 5 is a diagrammatic representation showing the sequence of certain events during an opening and a closing stroke of the circuit breaker of FIG. 1.
  • FIG. 1 there is shown a circuit interrupter 10 comprising a pair or separable contacts 11 and 12.
  • Contact 11 is a stationary contact
  • contact 12 is a movable contact I that is vertically movable into and out of engagement with the stationary contact.
  • the circuit breaker is shown in its fully closed position where contact 12 engages contact 11. Opening of the circuit breaker is effected by driving contact 12 from its position of FIG. 1 downwardly through its inter mediate position of FIG. 3 into its fully open position of FIG. 4. Closing is effected by returning contact 12 from its position of FIG. 4 to its position of FIG. 1.
  • the contacts 11 and 12 are shown located inside a highly evacuated envelope 13 comprising a cylindrical insulated casing 14 and upper and lower end caps 8 and 15 respectively joined thereto by vacuum-tight seals 16.
  • Stationary contact 11 is mounted on a stationary conductive contact rod 9 that is integrally joined to the upper end cap 8.
  • Movable contact 12 is mounted on a movable conductive contact rod 17 metallic bellows permits vertical movement of rod 17 .without impairing the vacuum inside envelope l3.
  • the interrupter is mounted on a stationary frame 70 to which the lower end plate is suitably attached.
  • a suitable guide link 18 is pivotally connected at one end to the frame 70 I and at its other end to the contact rod 17. This guide link coacts with a suitable slide bearing 18a to confine motion of the contact rod 17 to a substantially straight-line vertical path.
  • the above-mentioned wipe device 22 comprises a driving part in the form of a cylindrical carriage 24 coupled to operating rod 21 and a driven part in the form of a piston 25 coupled to contact rod 17 and slidably mounted within the bore of cylindrical carriage 24. Also disposed within the bore of carriage 24 is a precompressed wipe spring 26 which urges piston 25 upwardly toward engagement with an annular stop 27 on the carriage.
  • a precompressed wipe spring 26 which urges piston 25 upwardly toward engagement with an annular stop 27 on the carriage.
  • wipe-travel serves to provide a force that helps to hold the contacts in engagement after closing despite limited wear of the contacts that might have previously occurred.
  • Wipe device 22 functions during an opening operation to permit operating rod 21 to move downwardly through the entire wipe distance W while the contacts still remain in engagement.
  • stop 27 strikes piston 25 and carries contact rod 16 downwardly with operating rod 21.
  • the closing mechanism 20 comprises a pair of toggle links 32 and 34 pivotally joined together at a knee 35.
  • One of the toggle links 32 is pivotally connected at its opposite end to the lower end of operating rod 21 by means of a pivot pin 36.
  • the other toggle link 34 is pivotally connected by pivot pin 38 to the upper end of a guide link 39.
  • Guide link 39 is pivotally supported at its lower end on a fixed fulcrum 40 and is biased toward its position of FIG. 1 by a suitable reset spring 40a.
  • the pivot pin 38 carries a latch roller 41 which cooperates with'a suitable trip latch 42, which is normally held in its reset position of FIG. 1 by a reset spring 42a.
  • Trip latch 42 is arranged to be operated in response to predetermined circuit conditions by means of a suitable conventional tripping solenoid 44. Typically, the tripping solenoid 44 is suitably connected to be operated in response to an overcurrent through the power circuit through the breaker. After the solenoid is deenergized, reset spring 420 returns latch 42 to its reset
  • FIG. 1 illustrates the position of the parts after knee 35 has been moved to the right to effect complete circuit-breaker closing. This closing motion of knee 35 from its position of FIG. 4 to its position of FIG. 1 is produced by the action of a rotatable cam 50 cooperating with the usual roller 52 which is mounted at knee 35. When cam 50 is rotated counterclockwise from its position of FIG.
  • Opening of the circuit breaker is eflected by tripping latch 42. This renders the closing mechanism 20 incapable of transmitting continued closing thrust to operating rod 21. Accordingly, the opening spring 19 quickly discharges to drive operating rod 21 downwardly from its position of FIG. 1 through its position of FIGS. 2 and 3 into its position of FIG. 4. This motion carries the contact rod 17 downwardly through an opening stroke.
  • the guide link 39 is forced in a clockwise direction about its stationary pivot 40 by such opening motion; but at the end of the opening stroke, when toggle 32, 34 has collapsed, reset spring 40a returns the guide link to its reset position of FIG. 4, where it is relatched by latch 42.
  • This electromagnetic-assist means 60 comprises a flexible conductor 62 of a loop-shape form connected in series with the contacts 11, 12. Qne end of the flexible conductor 62 is suitably connected to contact rod 17 at 63, and the opposite end is connected at 64 to a copper terminal stud 65.
  • Flexible conductor 62 is preferably of copper braid.
  • the arm 67 and the stud are fixed to a stationary supporting framework 70.
  • This supporting framework 70 is preferably of a low conductivity metal so that substantially all current flows through the arm 67 of the copper braid without entering framework 70. Most of the rest of the braid 62 is physically connected to other parts of the electromagnetic-assist means 60, as will soon be explained. Suitable local insulation is provided, however, to confine the primary current path to the braid 62.
  • the electromagnetic-assist means 60 further comprises a toggle comprising two toggle links 74 and 75 pivotally joined together at a knee 76.
  • Upper toggle link 74 has its upper end pivotally connected to contact rod 17 by a pivot pin 77.
  • Lower toggle link 75 has its lower end pivotally mounted at 78 on a toggle support lever 80.
  • Toggle support lever 80 has one end pivotally mounted on a fixed pivot 82 carried by frame 70.
  • the opposite, or free, end of toggle support lever 80 is restrained in its position of FIG. 1 by a releasable latch 83 that cooperates with a latch roller 85 carried by lever 80.
  • a suitable stop 86 prevents counterclockwise motion of lever 80 past its position of FIG. 1.
  • the latch 83 which is pivoted on a stationary pivot 87 carried by frame 70, will soon be described in more detail.
  • the lower portion of this conductor is mechanically connected to the toggle support lever 80, and the arm 68 is mechanically connected to the two toggle links 74 and 75.
  • Current flowing at any given instant through the loop-shaped conductor 62 passes in opposite directions through the two arms 67 and 68, developing magnetic fields around the two arms that interact in a known manner to produce a repulsive magnetic force F that urges the arms apart.
  • This repulsive magnetic force varies directly with the square of the current passing through the loop-shaped conductor. The effect of this repulsive magnetic force is to urge the toggle 74, 75 toward an in-line or extended position, thus developing a force on the contact rod 17 that acts in an upward closing direction.
  • the geometry of the toggle 74, 75 is preferably such that the electromagnetic repulsion force between the two arms 67 and 68 is multiplied by a factor of 2 or 3.
  • Toggle linkage 74, 75 is a highly efficient arrangement for producing this desirable force-multiplying effect.
  • Such joints may be used in the toggle 74, 75 and the toggle made of a highly conductive metal such as copper or suitable copper alloy so that current can be carried directly therethrough via a path of the same general shape as the illustrated arm 68, but without reliance upon the braid.
  • the toggle itself would then constitute the arm 68, and the magnetic repulsive force F would be exerted directly on the toggle without being transmitted through any braid.
  • both the contact-separating magnetic force and the magnetic-assist force vary as the square of the current. Since the design is such that the magnetic-assist force is greater than the contact-separating force, the magneticassist force automatically stays above the contactseparating force irrespective of the extend that the current rises, assuming, of course, that the magnetic-assist means is not in its disabled condition described hereinafter. Although this is a preferred relationship, it is only necessary that the sum of the wipe spring force and the magnetic-assist force exceed the contact-separating force at all currents within the rating of the breaker.
  • This disabling means comprises the releasable latch 83 and means responsive to opening movement of operating rod 21 for releasing latch 83 to free the toggle-support lever 80 for clockwise motion about its pivot 82.
  • toggle support lever 80 is thus free, the toggle 74, 75 is no longer capable of imparting substantial closing force to contact rod 17.
  • FIG. 3 illustrates the behavior of the magnetic-assist means 60 during this period when it is disabled.
  • latch 83 is shown released, and the toggle support lever 80 is moving in a downward, or clockwise, direction against the action of a relatively weak reset spring 88.
  • the opposition of the magnetic-assist means 60 to opening can be no greater than that offered by relatively weak reset spring 88. With only this minor opposition to overcome, opening can take place at the desired high speed.
  • a pin 90 is provided on the operating rod for cooperating with the latch 83.
  • pin 90 is located in an enlarged notch 92 in latch 83.
  • FIG. 2 shows the parts after the downward moving pin 90 has driven latch 83 counterclockwise to the point at which the latch is just ready to release the toggle-support lever 80.
  • latch-reset spring 96 is so constructed that it returns the latch in a clockwise direction to a neutral position just short of where it would be effective to latch the toggle-support lever 80.
  • the force F depicted in FIG. 3 disappears, and toggle-support lever 80 returns to its position shown in FIG. 4 under the influence of reset spring 88.
  • Lever 80 is not latched in this position, however, since latch 83 is then being held by its reset spring 96 in the above-described neutral position where it is ineffective to latch lever 80.
  • lever 80 remain unlatched when the circuit breaker is fully open because this retains the magneticassist means 60 in a disabled condition and thus prevents an inadvertent closing of the circuit breaker in response to any electrical breakdown between the contacts l1, 12 which might result in a resumption of current through the circuit breaker. If lever 80 was in a latched condition during the passage of such current, the magnetic-assist means 60 would develop a closing force which would return the contacts to closed position. In most applications, such closing would be undesirable. If circuit-breaker closure under such conditions is desired or can be tolerated, then it is satisfactory to allow latch 83 to reset to a latching position with respect to toggle support lever 80 when the circuit breaker is fully open and an interrupting operation has been completed.
  • a closing operation is performed by driving closing cam 50 counterclockwise from its position of FIG. 4 into its position of FIG. 1, thereby extending toggle 32, 34 of the closing mechanism 20 and driving operating rod 21 upwardly.
  • pin 90 on the upwardly moving operating rod engages the lower surface 98 of nose 94 on latch 83, thereby pivoting latch 83 clockwise from its position of FIG. 4 to force the latch into a latching position beneath roller on toggle-support lever 80.
  • the latch 83 be restored to its latching position prior to the instant at which current flow through the contacts is reinitiated. This can be accomplished if the latch is restored to its latching position prior to the point of contact engagement, with a slight margin allowed for a possible restrike between the contacts when they are close together just prior to reaching engagement.
  • This timing is illustrated in the diagram of FIG. 5, where it can be seen that during the closing stroke A, the latch resets at a point 100 just preceding contact-engagement. The reason for this timing is that unless the latch is reset, the magnetic-assist means 60 remains disabled and therefore unavailable to provide the suppler'nental force that would be needed under high current conditions for closing against the magnetic opposing force developed as soon as current flow is resumed. But with the latch reset before the point at which current flow is resumed, the magnetic-assist means 60 is available to supply the required supplemental closing force as soon as current flow is resumed.
  • FIG. 2 best illustrates this relationship, showing how downward opening motion of the operating rod 21 is in the act of releasing latch 83 while some wipe travel at 104 is still needed before the contacts will part.
  • our magnetic-assist means 60 is usable with an operating mechanism 19, 20, 21, 22 that is of an essentially conventional design. This permits existing components to be used for such operating mechanism. But with the magnetic-assist means 60 present, the operating mechanism can be used in circuit breakers with a much higher momentary and interrupting current rating than it could be used in without the magnetic-assist means.
  • Another significant advantage of our overall mechanism is that we are able to precisely control the contact-closing velocity and to limit the terminal closing velocity to a relative- 1y low value suitable for vacuum interrupter contacts.
  • Another advantage of our mechanism is that it does not rely on any sort of latch for holding its contacts open when the circuit breaker is open. This function is performed by the opening spring 19, and no reliance is had upon either of the latches 83 or 42 for this hold-open function. By avoiding any need for relying upon a hold-open latch, we assure that latch failure does not cause inadvertent closing of the contacts. Another advantage of our mechanism is that it is readily usable in circuit breakers that comprise a plurality of sets of contacts which must be mechanically coupled together for operation in synchronism.
  • the coupling between the phases can be achieved with a rigid linkage of conventional design at ground potential connected between the lower ends of the operating rods.
  • An example of such a coupling is shown at 92, 95 in US. Pat. No. 3,163,735-Mil1er, assigned to the assignee of the present invention.
  • the wipe device 22 in each phase has some resilience but during the crucial stages of contact-motion this resilience is negligible.
  • Still another advantage of our overall mechanism is that the reaction forces developed by the magnetic-assist means 60 are not transmitted to the closing mechanism 20 or operating rod 21. Such forces are transmitted directly to the rigid stationary frame 70 through a force-transmitting path tat bypasses these latter components.
  • the reaction force that the toggle 74, exerts on toggle-support lever is transmitted to frame 70 through latch 83 and completely bypasses the operating rod 21 and closing mechanism 20.
  • the magnetic repulsion force exerted on the arm 67 of the loop-shaped conductor 62 is transmitted directly to stationary frame 70, against which it bears, without reaching the operating mechanism 20 or operating rod 21.
  • Our magnetic-assist means has the additional advantage of reducing contact-bounce upon closing.
  • the hold-closed force supplied by the magnetic-assist means 60 at the instant of contact-engagement is in opposition to the bounce and thus tends to suppress it. While the extra mass added to the contact rod by the presence of the magnetic-assist means does detract somewhat from the bounce-suppressing ability of the magnetic-assist means, we are able to limit this detracting effect because our toggle adds relatively little effective mass compared to the mass that would be added by other comparable mechanisms capable of developing a corresponding magnetic closing force.
  • An electric circuit breaker comprising:
  • electromagnetic-assist means for developing a magnetic closing force on said movable contact which varies directly in accordance with the current through said contacts
  • said electromagnetic-assist means comprising a substantially rigid supporting member which when restrained in a fixed position renders said electromagnetic-assist means capable of transmitting closing force to said movable contact but which, when released, renders said electromagnetic assist means generally ineffective to transmit closing force to said movable contact,
  • releasable latching means for restraining said supporting member in said fixed position when said contacts are engaged
  • a wipe mechanism coupling together said operating member and said movable contact and permitting limited overtravel in a closing direction of said operating member after said contacts engage during a closing operation and also permitting limited travel of said operating member in an opening direction before opening force is transmitted from said operating member to said movable contact
  • releasing means responsive to travel of said operating member in an opening direction for releasing said latching means prior to disengagement of said contacts during an opening operation
  • restoring means operable following separation of said contacts and completion of an interrupting operation for restoring said latching means to restraining relationship with said supporting member before said contacts engage during a subsequent closing operation.
  • a toggle having one end coupled to said supporting member and its opposite end coupled to said movable contact independently of said operating member, said toggle imparting a closing force to said movable contact when forced toward an in-line position
  • conductive means in series with said contacts for carrying current through a loop-shaped path that comprises a pair of series-connected arms between which a repulsive mag netic force is developed that urges said arms apart when current traverses said loop-shaped path,
  • conductive means in series with said contacts for carrying current through a loop-shaped path that comprises a pair of series-connected arms between which a repulsive magnetic force is developed that urges said arms apart when current traverses said loop-shaped path,
  • said releasable latching means comprises a latch and means biasing said latch toward a non-latching neutral position located near where the latch becomes effective to latch said supporting member,
  • said releasing means allowing said latch to return to said neutral position at a point in the opening operation near the end of opening travel of said operating member
  • the circuit breaker of claim 1 in which:
  • said releasable latching means comprises a latch and means biasing said latch toward a non-latching neutral position
  • said restoring means comprises latch-control means coupled to said operating member for encountering said latch and forcing said latch into a latching position in response to closing travel of said operating member prior to contact engagement,
  • said latch is shaped to allow said latch to return partially to said non-latching neutral position in response to further closing motion of said operating member after the latch-control means initially encounters said latch,
  • said latch-control means prevents said biasing means from forcing said latch into non-latching neutral position during closing travel of said operating member following the initial encounter with said latch, thereby maintaining said latching means in restraining relationship with said supporting member during said latter travel.
  • means is responsive to travel of said operating structure in a closing direction.
  • said latching means is so located that the reaction force produced by said electromagnetic-assist means in developing said closing force is transmitted to said latching means via a force-transmitting path that bypasses said trip-free mechanism.
  • An electric circuit breaker comprising:
  • said closing mechanism is a trip-free mechanism that is c. electromagnetic-assist means for developing a magnetic coupled to said movable contact through said operating closing force on said movable contact which varies structure, and
  • said latching means is so located that the reaction force tacts, produced by said electromagnetic-assist means in d.
  • said electromagnetic-assist means comprising a substandeveloping said hold-closed force is transmitted to said tially rigid supporting member which when restrained in a latching means via a force-transmitting path that bypasses fixed position renders said electromagnetic-assist means said trip-free mechanism.
  • the circuit breaker of claim 10 in which said electact but which, when released, renders said electromagtromagnetic-assist means comprises:
  • netic-assist means generally ineffective to transmit closa.
  • a toggle having one end coupled to said supporting ing force to said movable contact, member and its opposite end coupled to said movable e. releasable latching means for restraining said support-ing Contact, Said toggle imparting a closing force to said member in said fixed position when said contacts are enm va Con c h n f ced w r n in-line p i i n, gaged, b. conductive means in series with said contacts for carrying f. a circuit-breaker closing mechanism, current through a loop-shaped path that comprises a pair g.

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  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
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US865046A 1969-10-09 1969-10-09 Electric circuit breaker with magnetically assisted closing means Expired - Lifetime US3663906A (en)

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US86504669A 1969-10-09 1969-10-09

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US (1) US3663906A (ja)
JP (1) JPS508499B1 (ja)
DE (1) DE2049393A1 (ja)
FR (1) FR2065150A5 (ja)
GB (1) GB1319269A (ja)
SE (1) SE371325B (ja)

Cited By (20)

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US3777291A (en) * 1972-11-20 1973-12-04 Gen Electric Electric switch with magnetic-assist means to assist switch in closing and remaining closed against high currents
US3921109A (en) * 1974-06-20 1975-11-18 Westinghouse Electric Corp Circuit-interrupter
US4025886A (en) * 1976-06-04 1977-05-24 General Electric Company Electric circuit breaker with electro-magnetically-assisted closing means
US4030055A (en) * 1976-02-27 1977-06-14 General Electric Company Electric circuit breaker with electro-magnetic means for opposing magnetic contact-repulsion forces
US4032870A (en) * 1975-09-15 1977-06-28 General Electric Company Electric circuit breaker with electromagnetic-assist means for opposing magnetic contact-separating forces
US4099039A (en) * 1976-12-20 1978-07-04 General Electric Company Means for effectively controlling the forces imposed on the movable contact of a vacuum-type circuit interrupter
US4263572A (en) * 1978-10-16 1981-04-21 S & C Electric Company Shunt trip mechanism for a circuit interrupting device
DE3432086A1 (de) * 1984-08-28 1986-03-06 Siemens AG, 1000 Berlin und 8000 München Kontaktanordnung mit einer die kontaktkraft vergroessernden stromabhaengigen kraft
DE3726739A1 (de) * 1987-08-07 1988-03-03 Slamecka Ernst Kontaktdruckerzeugungsvorrichtung insbesondere fuer vakuumschalter in einfach- oder zweifach-reihen-anordnung
DE4210714A1 (de) * 1992-03-27 1993-09-30 Siemens Ag Vakuumschalter mit einer Stromschleifenanordnung
AU692536B2 (en) * 1994-03-30 1998-06-11 Eaton Electric N.V. Drive arrangement for vacuum power circuit breakers, in particular in a tri-polar configuration
US5767451A (en) * 1994-05-30 1998-06-16 Siemens Aktiengesellschaft Insulating support for vacuum switch tubes
DE19852530C1 (de) * 1998-11-06 2000-06-21 Siemens Ag Vakuumschalter, insbesondere für Hochspannung
WO2001009912A3 (en) * 1999-07-30 2001-06-07 Abb Ricerca Spa Circuit breaker
EP1139358A1 (fr) * 2000-03-31 2001-10-04 Schneider Electric Industries SA Appareillage électrique de coupure comportant une ampoule à vide et une liaison électrique flexible
US20080218296A1 (en) * 2007-03-07 2008-09-11 Weister Nathan J Electrical switching apparatus, and conductor assembly and shunt assembly therefor
US20100307893A1 (en) * 2007-09-11 2010-12-09 Siemens Aktiengesellschaft Insulating switching rod
WO2013044990A1 (en) * 2011-09-30 2013-04-04 Abb Technology Ag Actuating device for a current switching device
WO2015132072A1 (de) * 2014-03-05 2015-09-11 Maschinenfabrik Reinhausen Gmbh Betätigungsvorrichtung zum betätigen einer vakuumschaltröhre, schaltvorrichtung mit einer solchen betätigungsvorrichtung sowie laststufenschalter mit einer solchen schaltvorrichtung
WO2020159715A1 (en) * 2019-01-31 2020-08-06 S&C Electric Company Manual close assist control mechanism

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US4247745A (en) * 1978-09-13 1981-01-27 Westinghouse Electric Corp. Vacuum-type contactor assembly
DE3815805A1 (de) * 1988-05-09 1989-11-23 Calor Emag Elektrizitaets Ag Vakuumschalter
GB2247569A (en) * 1990-08-30 1992-03-04 Mk Electric Ltd Energy storage device/ circuit breaker assembly
DE4133092A1 (de) * 1991-09-30 1993-04-01 Siemens Ag Mehrpoliger vakuumschalter mit einer polantriebseinheit fuer jede vakuumschaltroehre
JP2008140732A (ja) * 2006-12-05 2008-06-19 Osaka Titanium Technologies Co Ltd 大電流遮断器
GB2557584A (en) * 2016-09-16 2018-06-27 Eaton Ind Netherlands Bv Circuit Breaker with open-close-open Functionality
DE102017207039A1 (de) * 2017-04-26 2018-10-31 Siemens Aktiengesellschaft Vakuumschalter
JP6687295B2 (ja) * 2017-05-23 2020-04-22 三菱電機株式会社 開閉装置

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US2695345A (en) * 1950-04-19 1954-11-23 Ite Circuit Breaker Ltd Blow open, blow closed circuit breaker
US3366900A (en) * 1966-06-16 1968-01-30 Gen Electric Electric circuit breaker with electromagnetic means for opposing contactrepulsion forces

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Cited By (28)

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Publication number Priority date Publication date Assignee Title
US3777291A (en) * 1972-11-20 1973-12-04 Gen Electric Electric switch with magnetic-assist means to assist switch in closing and remaining closed against high currents
US3921109A (en) * 1974-06-20 1975-11-18 Westinghouse Electric Corp Circuit-interrupter
DE2450424A1 (de) * 1974-06-20 1976-03-18 Westinghouse Electric Corp Schaltvorrichtung
US4032870A (en) * 1975-09-15 1977-06-28 General Electric Company Electric circuit breaker with electromagnetic-assist means for opposing magnetic contact-separating forces
US4030055A (en) * 1976-02-27 1977-06-14 General Electric Company Electric circuit breaker with electro-magnetic means for opposing magnetic contact-repulsion forces
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Also Published As

Publication number Publication date
GB1319269A (en) 1973-06-06
SE371325B (ja) 1974-11-11
FR2065150A5 (ja) 1971-07-23
DE2049393A1 (de) 1971-04-29
JPS508499B1 (ja) 1975-04-04

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