US2913556A - Circuit interrupters - Google Patents

Circuit interrupters Download PDF

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Publication number
US2913556A
US2913556A US571535A US57153556A US2913556A US 2913556 A US2913556 A US 2913556A US 571535 A US571535 A US 571535A US 57153556 A US57153556 A US 57153556A US 2913556 A US2913556 A US 2913556A
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US
United States
Prior art keywords
movable
contact
contacts
gas
established
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
US571535A
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English (en)
Inventor
Winthrop M Leeds
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US571535A priority Critical patent/US2913556A/en
Priority to GB726457A priority patent/GB813077A/en
Application granted granted Critical
Publication of US2913556A publication Critical patent/US2913556A/en
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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow

Definitions

  • piston wing which forces fluid toward a plurality of
  • the present invention describes two arrangements involving one or more pumpetype interrupter units in series with one or more plain breaks.
  • the pumping effort is reduced to the minimum required for adequate fault interruption, while the added plain breaks in series provide restrike-free charging current interruption.
  • the additional gaps also .make possible adequate insulating strength in the open position with shorter stroke, than .if fewer series breaks were used.
  • Figure l is a vertical longitudinal sectional View through one embodiment of my invention, the contact structure being indicated in the partially open-circuit position;
  • Fig. 2. is a sectional view taken substantially along the line II.II of Fig. 1;
  • Fig. 3 is a vertical sectional view taken through another embodiment of my invention.
  • Fig. 4 is a sectional view taken substantially along the line lV-IV of Fig. 3;
  • Fig. 5 is another sectional view taken substantially along the line V-V of Fig. 3.
  • the reference numeral 1 designates a casing composed of a suitable weatherproof material, preferably porcelain.- Disposed interiorly within the elongated cylindrical casing 1 is an insulating tube 2 secured'by bolts 3 to a lower casting support 4, The insulating tube 2 supports at its upper end by additional bolts 5 a relatively stationary operating cylinder 6, within which moves a piston 7. The piston 7 is secured by a threaded connection to an upper movable contact 8 carried by a bridging member 9, the outer ends of which are secured to a pair of longitudinally extending insulating operating rods 10. The operating cylinder 6 and the piston 7 define, at times, a pressure chamber, adjacent which is established a contact gap, as hereinafter described.
  • the operating rods 10, in addition to carrying the upper movable contact 8, have further bridging members 11, 12, each of which carries an associated movable contact 13 or 14.
  • the movable contact 14 has a lower extension 15, which is pivoted, as at 16, to a link 17.
  • the link 17 is pivoted, as at 18, to a crank arm 19 rotatable about a fixed axis 20. Any suitable means may be provided for effecting rotation of the crank arm 19and hence through the linkage 17, longitudinal opening and closing motion of the framework 21, comprising the two insulating operating rods 10 and their associated movable contact structure.
  • the insulating tube 2 has a plurality of annular recesses 22 provided therein, within which is seated a plurality of metallic discs 23 which carry relatively sta- .tiona'ry contacts 24, 25.
  • Flexible connectors 26 and 27 connect the movable and stationary contacts 9, 25 and 13, 24 electrically in series, so that in the closed position of the interrupter the circuit therethrough extends from ya terminal plate portion 28 of an upper cover casting 29 to the upper stationary contact 30.
  • the circuit then extendsthrough the upper movable contact 8, through the conducting bridging portion 9 and through the flexible conector 26 to the conducting disc 23.
  • the circuit then extends through the relatively stationary contact 25 to the second movable contact 13 of the movable framework 21.
  • the circuit then extends through the conducting bridging member 11 and through the flexible connector 27 to the lowermost conducting disc 23, and hence through the lowermost stationary contact 24 to the lower movable contact 14. From here the circuit extends through a flexible connector 31 to the conducting lower casting support4 to a lower terminal stud 32.
  • the fluid disposed interiorly within the casing 1 may be any suitable gas, liquid, vapor or spray for some applications, but preferably, it is most desirable to use sulphur hexafluoride gas, the rernarkahle arc-extinguishing 3 properties of which are set out in United States patent application, filed July 19, 1951, Serial No. 237,502, now United States Patent 2,757,261 issued July 31, 1956 to Harry J. Lingal, Thomas E. Browne, Jr., and Albert P. Strom, and assigned to the assignee of the instant application.
  • the gas could be selenium hexafluoride, the arc-extinguishing characteristics of which are set out in United States patent application filed September 14, 1954, Serial No.
  • the gas could be a mixture of SE, with SeF or mixtures of either or both of said gases with such gases as helium, nitrogen, carbon dioxide, argon or air.
  • gases such gases as helium, nitrogen, carbon dioxide, argon or air.
  • two of the breaks that is the two lowermost of the three breaks, are plain breaks, that is they are established in a surrounding ambient relatively free of fluid-flow conditions, and are particularly effective in establishing adequate dielectric strength, particularly suitable for the interruption of leading currents associated with the switching of capacitor banks.
  • the upper break on the other hand, established be- Y tween the contacts 8, 30 is established within a region of relatively strong fluid flow, as provided by the piston means 39.
  • the upper break is particularly eflective in interrupting considerable current and voltage un- 7 not necessary to have forced fluid flow at all the breaks, A
  • a rotatable insulating operating shaft 40 is employed, being rotated by a crank arm 41 which may be linked, as at 42, to a drive shaft 43 having a bifurcated end, as shown.
  • rotatable operating shaft 40 carries therewith a plurality of U shaped movable contacts 44, each having a collar portion 45 which is pinned by pins 46 to the shaft 40 so'a's not to slip upon the shaft 40.
  • the U-shape d movable contacts 44 have tip portions 47 which cooperate with relatively stationary contacts 48, the lat.-
  • the several contacts are electrically connected in series 4 by strap portions 51-53 so that a plurality simultaneous breaks are provided.
  • a pair of insulating discs 56 which assist in providing a piston or pressure chamber 57, within which moves a rotatable vane, or piston wing 58 (Fig. 4).
  • the piston chamber 57 is also defined by an insulating curved wall 75 and a stationary insulating filler block 76.
  • the piston 'wing 58 is secured to and rotatable with the rotatable operating shaft 40.
  • nozzles 59 Associated with the insulating piston wing 58 is a pair of nozzles 59 having a construction similar to the nozzle 38, hereinabove referred to in connection with Fig. 1. Also, the upper end of the rotatable operating shaft 40 carries a pair of rotatable movable contacts 60, 61 which cooperate with a pair of relatively stationary contacts 63, 64. The movable contacts 60, 61 are electrically interconnected by a strap portion 65 so that the contact breaks are all in series electrically.
  • the upper stationary contact 63 is electrically connected by a strap connector 66 to an upper cover casting 67 having a terminal stud 68.
  • a shield 72 for grading the stress axially along the interrupter 71 may be provided and may be integrally formed with the cover casting 67.
  • the lower support casting 69 has a terminal stud 70 of series associated therewith.
  • the electrical circuit extending through the modified interrupter 71 proceeds in an obvious manner, namely from terminal stud 68, through the conducting cover casting 67 and through the conducting strap 66 to the upper stationary contact 63.
  • the circuit then extends throughthe movable contact 60 and strap connection 65 to the movable contact 61.
  • the circuit then extends through the stationary contact 64 and through the strap connection 53 to the movable contact 47 of the upper U-shaped contact member 44.
  • the circuit then extends in an obvious zigzag manner, referring to Fig. 3, to the lower strap 51 and hence through the conducting casting support 69 to the lower terminal stud 70.
  • a plurality of shunting capacitors C may be employed.
  • the bifurcated drive shaft 43 effects through the pin connection 42 rotation of the crank arm 41 and hence rotatable motion of the operating shaft 40.
  • the upper two arcs are drawn through the two nozzles 59 associated with the piston wing or gas-pressure producing means 58. This forces fluid from the pressure chamber through the nozzles 59 to direct .a strong blast of fluid against the upper two arcs.
  • the lower four arcs are not subjected to any fluid flow, and are particularly effective during capacitor switching.
  • the upper two breaks which are affected by the piston action, provide deionizing conditions necessary for enabling the interrupter to interrupt high power during fault conditions.
  • an all-purpose interrupter in which four of the breaks are plain breaks and are drawn in a surrounding ambient relatively free of fluid-flow conditions, whereas the uppertwo breaks are both established in a surrounding ambient in which relatively strong fluid-flow conditions exist.
  • the upper two breaks in the interrupter 71 areparticularly effective during fault-current interruption, whereas the lower four breaks, being plain breaks, are particularly effective forestablishing adequate dielec tric strength during capacitor switching.
  • a circuit interrupter including an operating rod positively carrying a plurality of movable contacts, a plurality of relatively stationarycontacts, means electrically connecting the several contacts in series, movement of the operating rod effecting simultaneous separation of the movable contacts away from the relatively stationary contacts to drawa plurality of arcs in series, a relatively stationary operating cylinder, a piston movable with the operating rod and operable within said operating cylinder to force fluid toward one of the established arcs, and one or more other contact gaps establishing arcing in a surrounding ambient relatively free of fluid-flow conditions.
  • a circuit interrupter including a rotatable operating shaft carrying a plurality of movable contacts, a plurality of relatively stationary contacts, means electrically connecting the several contacts in series, the several pairs of contacts separating simultaneously, piston means responsive to the rotation of the rotatable operating shaft to force fluid toward one or more of the established arcs, and one or more of the established arcs being drawn in an ambient relatively free of fluid-flow conditions.
  • a circuit interrupter including an elongated insulating cylinder, a rotatable operating shaft closely disposed to one wall of said insulating cylinder and extending axially thereof, an insulating piston wing and an orifice carried by said rotatable operating shaft, means defining a plurality of relatively stationary contacts spaced axially along said elongated insulating cylinder, a plurality of movable contacts carried by said rotatable operating shaft, one of said movable contacts disposed in close proximity to said movable orifice, one of said relatively stationary contacts and another of said movable contacts separating in a surrounding ambient which is relatively free of fluid-flow conditions, and rotation of said rotatable operating shaft causing said movable piston wing to force fluid through said orifice to effect extinction of the are established atsaid one movable contact.
  • a circuit interrupter including an elongated insulating cylinder, a rotatable operating shaft closely disposed to one wall of said insulating cylinder and extending axially thereof, an insulating piston wing and an orifice carried by said rotatable operating shaft, a curved wall member extending axially of said elongated insulating cylinder and disposed therein, said rotatable piston wing rotating closely to said curved wall member, means defining a plurality of relatively stationary contacts spaced axially along said elongated insulating cylinder, a plu rality of movable contacts carried by said rotatable operating shaft, one of said movable contacts disposed in close proximity to said movable orifice, one of said relatively stationary contacts and another of said movable contacts separating in a surrounding ambient which is relatively free of fluid-flow conditions, and rotation of said rotatable operating shaft causing said movable piston wing to force fluid through said orifice to effect extinction of the are established at said one movable
  • a circuit interrupter including an elongated insulat ing cylinder, a rotatable operating shaft closely disposed to one wall of said insulatingcylinder and extending axially thereof, an insulating piston wing and an orifice carried by said rotatable operating shaft, a curved wall member extending axially of said elongated insulating cylinder and disposed therein, said rotatable piston wing rotating closely to said curved wall member, a stationary insulating filler block disposed along said elongated insulating cylinder in the region of said curved wall member and conforming to the curved wall of said elongated insulating cylinder, means defining a plurality of relatively stationary contacts spaced axially along said elongated insulating cylinder, a plurality of movable contacts carried by said rotatable operating shaft, one of said movable contacts disposed in close proximity to said movable orifice, one of said relatively stationary contacts and another of said movable contacts separating in a surrounding ambient
  • a circuit interrupter of the gas-blast type having separable contact-gap forming means including a movable operating rod carrying a plurality of movable contacts, means connecting the movable contacts in series, means arranging the separable contact-gap forming means such that all of the serially related contact gaps are drawn simultaneously, one or more of the serially related contact gaps being established in an arc-extinguishing gas which is free of gas-flow conditions, means defining a pressure chamber relatively remote from said one or more contact gaps which are established in gas free of gas-flow conditions, at least another contact gap being established immediately adjacent said pressure chamber,
  • a circuit-interrupter of the gas-blast type including a casing containing sulfur hexafluoride gas, separable contact-gap forming means disposed within said casing including a movable operating rod carrying a plurality of movable contacts, means connecting the movable contacts in series, means arranging the separable contactgap forming means such that all of the serially related contact gaps are drawn simultaneously, one or more of the serially related contact gaps being established in an arc-extinguishing gas which is free of gas-low conditions, means defining a pressure chamber relatively remote from said one or more contact gaps which are established in gas free "of gas-flow conditions,'at least another contact gap being established immediately adjacent said pressure chamber, and gas-pressure producing means responsive to opening movement of said operating rod for raising the gas pressure within said pressure chamber to effect deionizing gas flow at said other contact gap for effective fault-current interruption.
  • a circuit interrupter of the gas-blast type including an elongated cylindrical casing, separable contact-gap forming means including a rotatable insulating operating rod carrying hook-shaped movable bridging contacts, said rotatable operating rod extending longitudinally of said casing, means supporting a plurality of relatively stationary contacts spaced axially along said casing and cooperable with said movable contacts, means connecting the movable contacts in series, means arranging the separable contact-gap forming means such that all of the serially related contact gaps are drawn simultaneously, one or more.
  • A' circuit interrupter of the gas-blast type including an elongated cylindrical casing containing sulfur hexafiuoride gas, separable contact-gap forming means including a rotatable insulating operating rod carrying hookshaped movable bridging contacts, said rotatable operating rod extending longitudinally of said casing, means supporting a plurality of relatively stationary contacts spaced axially along said casing and cooperable with said -movable contacts, means connecting the movable con tacts in series, means arranging the separable contact-gap forming means such that all of the serially related contact gaps are drawn simultaneously, one or more of the serially related contact gaps being established in an arc extinguishing gas which is free of gas-flow conditions, means defining a pressure chamber relatively remote from said one or more contact gaps which are established in gas free of gas-flow conditions, at least another contact gap being established immediately adjacent said pressure chamber, and gas-pressure producing means responsive to opening movement of said operating rod for raising the gas pressure within said pressure chamber to effect de

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  • Circuit Breakers (AREA)
  • Breakers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US571535A 1956-03-14 1956-03-14 Circuit interrupters Expired - Lifetime US2913556A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US571535A US2913556A (en) 1956-03-14 1956-03-14 Circuit interrupters
GB726457A GB813077A (en) 1956-03-14 1957-03-05 Improvements in or relating to electric circuit interrupters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US571535A US2913556A (en) 1956-03-14 1956-03-14 Circuit interrupters
US576876A US2979589A (en) 1956-04-09 1956-04-09 Circuit interrupters

Publications (1)

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US2913556A true US2913556A (en) 1959-11-17

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US571535A Expired - Lifetime US2913556A (en) 1956-03-14 1956-03-14 Circuit interrupters
US576876A Expired - Lifetime US2979589A (en) 1956-03-14 1956-04-09 Circuit interrupters

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Application Number Title Priority Date Filing Date
US576876A Expired - Lifetime US2979589A (en) 1956-03-14 1956-04-09 Circuit interrupters

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US (2) US2913556A (de)
CH (1) CH352727A (de)
DE (2) DE1788496U (de)
ES (1) ES234103A1 (de)
FR (1) FR1186868A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164703A (en) * 1959-09-15 1965-01-05 Westinghouse Electric Corp Circuit interrupter of the single-bushing type with canted terminal-bushing construction
US3582589A (en) * 1968-01-30 1971-06-01 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3872272A (en) * 1973-04-17 1975-03-18 Hitachi Ltd Circuit breaker
US3895202A (en) * 1973-06-28 1975-07-15 Merlin Gerin Multibreak metal-clad puffer type circuit interrupter having staggered arc-extinguishing units
US4105880A (en) * 1976-01-20 1978-08-08 Licentia Patent-Verwaltungs-G.M.B.H. Arc blow-out switch
US4236054A (en) * 1977-08-12 1980-11-25 Licentia Patent-Verwaltungs-G.M.B.H. Gas-blast circuit breaker
FR2709862A1 (fr) * 1993-09-08 1995-03-17 Gec Alsthom T & D Sa Disjoncteur à contacts en bout et grande tension d'arc.
US20120175234A1 (en) * 2011-01-06 2012-07-12 Hitachi, Ltd. Switch Unit and Switchgear

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015154138A1 (en) * 2014-04-10 2015-10-15 Noja Power Switchgear Pty Ltd An electrical interrupter

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Publication number Priority date Publication date Assignee Title
GB312376A (en) * 1927-11-26 1929-05-27 Knut Jonas Elias Hesselman Improvements in internal combustion engines of the solid fuelinjection type
US1860337A (en) * 1931-05-19 1932-05-24 Gen Electric High tension circuit interrupter
US2253009A (en) * 1938-09-21 1941-08-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2283693A (en) * 1940-02-29 1942-05-19 Gen Electric Electric circuit breaker
US2394046A (en) * 1942-12-10 1946-02-05 Westinghouse Electric Corp Circuit interrupter
US2420889A (en) * 1945-04-06 1947-05-20 Westinghouse Electric Corp Circuit interrupter
US2465203A (en) * 1944-10-12 1949-03-22 Westinghouse Electric Corp Circuit interrupter
US2467788A (en) * 1944-07-20 1949-04-19 Westinghouse Electric Corp Circuit interrupter
US2675446A (en) * 1951-07-07 1954-04-13 Pacific Electric Mfg Corp Circuit-breaker structure
US2809259A (en) * 1955-04-15 1957-10-08 Westinghouse Electric Corp Circuit interrupters

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US1934454A (en) * 1932-04-13 1933-11-07 Gen Electric Oil blast circuit breaker
BE396426A (de) * 1932-05-20
DE599908C (de) * 1932-05-28 1934-07-11 Aeg Loeschkammerschalter fuer leitende Schaltfluessigkeiten
DE648635C (de) * 1932-09-29 1937-08-06 Sachsenwerk Licht & Kraft Ag Fluessigkeitsschalter
GB413751A (en) * 1933-01-26 1934-07-26 Reyrolle A & Co Ltd Improvements in or relating to oil-immersed electric circuit-breakers
US1984035A (en) * 1934-05-08 1934-12-11 Pacific Electric Mfg Corp Circuit interrupter
DE676618C (de) * 1935-03-19 1939-06-08 Siemens Schuckertwerke Akt Ges Schalter
US2192772A (en) * 1935-09-26 1940-03-05 Westinghouse Electric & Mfg Co Circuit interrupter
FR809068A (fr) * 1935-11-14 1937-02-23 Alsthom Cgee Nouvel interrupteur électrique pour haute tension
DE705099C (de) * 1936-11-11 1941-04-17 Emil Lange Elektrischer Schalter mit Lichtbogenloeschung durch einen Druckgasstrom
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Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB312376A (en) * 1927-11-26 1929-05-27 Knut Jonas Elias Hesselman Improvements in internal combustion engines of the solid fuelinjection type
US1860337A (en) * 1931-05-19 1932-05-24 Gen Electric High tension circuit interrupter
US2253009A (en) * 1938-09-21 1941-08-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2283693A (en) * 1940-02-29 1942-05-19 Gen Electric Electric circuit breaker
US2394046A (en) * 1942-12-10 1946-02-05 Westinghouse Electric Corp Circuit interrupter
US2467788A (en) * 1944-07-20 1949-04-19 Westinghouse Electric Corp Circuit interrupter
US2465203A (en) * 1944-10-12 1949-03-22 Westinghouse Electric Corp Circuit interrupter
US2420889A (en) * 1945-04-06 1947-05-20 Westinghouse Electric Corp Circuit interrupter
US2675446A (en) * 1951-07-07 1954-04-13 Pacific Electric Mfg Corp Circuit-breaker structure
US2809259A (en) * 1955-04-15 1957-10-08 Westinghouse Electric Corp Circuit interrupters

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164703A (en) * 1959-09-15 1965-01-05 Westinghouse Electric Corp Circuit interrupter of the single-bushing type with canted terminal-bushing construction
US3582589A (en) * 1968-01-30 1971-06-01 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3872272A (en) * 1973-04-17 1975-03-18 Hitachi Ltd Circuit breaker
US3895202A (en) * 1973-06-28 1975-07-15 Merlin Gerin Multibreak metal-clad puffer type circuit interrupter having staggered arc-extinguishing units
US4105880A (en) * 1976-01-20 1978-08-08 Licentia Patent-Verwaltungs-G.M.B.H. Arc blow-out switch
US4236054A (en) * 1977-08-12 1980-11-25 Licentia Patent-Verwaltungs-G.M.B.H. Gas-blast circuit breaker
FR2709862A1 (fr) * 1993-09-08 1995-03-17 Gec Alsthom T & D Sa Disjoncteur à contacts en bout et grande tension d'arc.
US20120175234A1 (en) * 2011-01-06 2012-07-12 Hitachi, Ltd. Switch Unit and Switchgear
CN102592879A (zh) * 2011-01-06 2012-07-18 株式会社日立制作所 开关单元及开关机构
CN102592879B (zh) * 2011-01-06 2015-01-14 株式会社日立制作所 开关单元及开关机构
US8975550B2 (en) * 2011-01-06 2015-03-10 Hitachi, Ltd. Switch unit and switchgear
TWI501492B (zh) * 2011-01-06 2015-09-21 Hitachi Ltd Switch unit and switch device

Also Published As

Publication number Publication date
FR1186868A (fr) 1959-09-03
DE1102859B (de) 1961-03-23
CH352727A (de) 1961-03-15
US2979589A (en) 1961-04-11
DE1788496U (de) 1959-05-14
ES234103A1 (es) 1957-06-16

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