US3071670A - Circuit interrupters - Google Patents

Circuit interrupters Download PDF

Info

Publication number
US3071670A
US3071670A US824304A US82430459A US3071670A US 3071670 A US3071670 A US 3071670A US 824304 A US824304 A US 824304A US 82430459 A US82430459 A US 82430459A US 3071670 A US3071670 A US 3071670A
Authority
US
United States
Prior art keywords
piston
interrupting
fluid
tank
circuit interrupter
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
US824304A
Other languages
English (en)
Inventor
Russell N Yeckley
Frank L Reese
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.)
Westinghouse Electric 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 US824304A priority Critical patent/US3071670A/en
Priority to DEW27886A priority patent/DE1156473B/de
Priority to CH619260A priority patent/CH386526A/de
Application granted granted Critical
Publication of US3071670A publication Critical patent/US3071670A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • 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
    • H01H33/02—Details
    • H01H33/022—Details particular to three-phase circuit breakers
    • 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
    • H01H33/022—Details particular to three-phase circuit breakers
    • H01H2033/024—Details particular to three-phase circuit breakers with a triangular setup of circuit breakers

Definitions

  • This invention relates to circuit interrupters in general, and more particularly to arc-extinguishing structures therefor.
  • a general object of the present invention is to provide an improved circuit interrupter, which will be of simple and highly effective construction, and which will also cover a Wide voltage range in interrupting ratings.
  • a more specific object of the present invention is to provide an improved circuit interrupter employing an improved pumping means for pumping arc-extinguishing fluid into the are to be interrupted.
  • a further object of the present invention is to provide an improved, dead-tank-type of circuit interrupter, in which a fluid-driving pump is associated with the one or more arc-extinguishing units to effectively bring about circuit interruption.
  • the invention has applicability when employed with any arc-extinguishing medium such as a suitable liquid, for instance circuit-breaker oil, and to a gaseous arc-extinguishing medium, such as air
  • a gaseous arc-extinguishing medium such as air
  • the invention has particular applicability when employed in a sealedtank construction, employing a highly effective arc-extinguishing gaseous medium, such as sulfur hexafluoride (SF or selenium hexafluoride (SeF or mixtures of the aforesaid two gases, or mixtures of such gases with carbon dioxide, helium, nitrogen, argon and hydrogen.
  • SF sulfur hexafluoride
  • SeF selenium hexafluoride
  • Yet a further object of the present invention is to provide an improved, simplified, puffer-type of circuit interrupter, in which a single piston and cylinder arrangement is operable to force fluid simultaneously into a plurality of interrupting structures.
  • the interrupting structures may be adjacent pole units in the other phases of the circuit interrupter, or, in the high-voltage ratings, the interrupting structures may be associated with a singlepole unit, involving only a single phase of the circuit interrupter.
  • An auxiliary object of the invention is to provide a simplified, dead-tank-type of circuit interrupter, in which the number of gasketed joints for the tank structure is and a minimum. This obviously has particular advantage, when an expensive gaseous-type of arc-extinguishing medium is employed, such as sulfur hexafluoride (SF gas.
  • SF gas sulfur hexafluoride
  • FIGURE 1 is a vertical sectional view taken through the center pole-unit of the three-phase circuit interrupter illustrated in FIG. 2, taken substantially along the line II of FIG. 2, with the contact structure being illustrated in the partially open-circuit position;
  • PEG. 2 is a plan View of the three-phase circuit interrupter of FIG. 1, with a portion of the cover plate broken away to disclose the single internally disposed puffer structure;
  • FIG. 3 is a considerably enlarged, plan view in section taken substantially along the line III-III of FIG. 4-;
  • FIG. 4 illustrates, in an enlarged fashion, the single puffer structure directing fluid into one of three interrupting structures, the contact structure being illustrated in the partially open-circuit position, and the view being taken substantially along the line IVIV of FIG. 3. It will be noted that the view of FIG. 4 is taken from the opposite side of the puffer structure than that shown in FIG. 1;
  • FIG. 4A illustrates, fragmentarily, a modified type of interrupting unit, which may be substituted for the interrupting unit of FIG. 4;
  • FIG. 5 illustrates a modified type of circuit interrupter, in which a single puffer structure is utilized for each of the three phases, the contact structure being shown in the closed-circuit position, and the sectional view being taken substantially along the line VV of FIG. 6;
  • FIG. 6 is a plan viewof the three-phase circuit interrupter of FIG. 5, with a portion of the cover plate being broken away to disclose the internal interrupting structure;
  • FIG. 7 illustrates a vertical sectional view taken through still another modified type of three-phase circuit interrupter, again the contact structure being shown in the closed-circuit position, the sectional view being taken substantially along the line VIIVII of FIG. 8;
  • FIG. 8 is a plan view of the circuit interrupter of FIG. 7, with a portion of the cover plate broken away to illustrate more clearly the internal interrupting arrangement.
  • the reference numeral 1 generally designates a three-phase circuit interrupter, wherein the three phases are disposed within a generally cylindrical tank 2. As shown. the tank 2 has a cover plate 3, which is secured, by mounting bolts 4 and associated nuts 5, to a mounting flange portion 6 of the tank 2.
  • each terminal bushing Extending downwardly internally into the cover 3, and secured thereto, are three pairs of terminal bushings 7, 8, 9, id, 11, 12.
  • the cover plate 3 would be provided with cylindrical flange supporting structures, not shown, to support the grounded mounting flange of each terminal bushing.
  • Extending longitudinally through each terminal bushing is the respective terminal stud therefor, such as stud 7A, 3A, 9A, 10A, 11A, or 12A.
  • a single pumping means generally designated by the reference numeral 13, and including an operating cylinder 14, within which reciprocally moves a fluiddriving piston 15.
  • FIG. 4 more clearly shows, to an enlarged scale, the construction of the pumping means 13.
  • the piston 15 has a piston ring 15A to provide a close fit with the internal Wall 14A of the operating cylinder 14.
  • a compresact 1
  • sion spring 16 is disposed between the top surface 17 of the piston and the closure plate 18, which closes the upper end of the operating cylinder 14.
  • the lower end of the lift rod 2t) has a threaded connection, as at 21, with a bifurcated rod-end 22, which is pivotally connected, as at 23, to a hookshaped contact arm 24, the latter being pivotally mounted, as at (FIG. 1), to a contact foot 26 secured to the lower end of the terminal stud 1 3A.
  • the movable contact end 27 of the rotatable contact arm 24 makes separable engagement with a relatively stationary contact 28, which is resiliently supported, by a contact compression spring 29, to the u per Wall St) of an interrupting unit, generally designated by the reference numeral 31.
  • An orifice structure 32 including a sleeve-like orifice member 33, is fixedly secured to the bottom wall 34 of the arc-extinguishing unit 31.
  • all three poles of the threephase circuit interrupter are disposed within a single tank 2.
  • a horizontally extending main operating shaft 35 extends through a single gas-tight seal into the interior 37 of the tank 2.
  • This rotatable operating shaft 35 has three crankarrns 33-40 clamped thereto.
  • the end crank arms 3S and 4%) are pivotally mounted as at 33A, 4tlA to insulating lift rods 41, 42, which have their lower ends pivotally connected to the adjacent contact arms 24.
  • the center crank arm 39 is pivotally connected, at 43, through a link 29A, to the insulating lift rod 20.
  • the other end 44 of the main operating shaft 35 is located within an internally disposed boss portion 45, which may be welded to the inner side wall of the tank 2, so that only a single gas-tight seal 36 is required for the main operating shaft 35.
  • FIG. 1 also shows current transformers 46, encircling the terminal bushings, for protective relaying functions, as well known by those skilled in the art.
  • the outer two contact arms 24, however, are hinged to the contact feet 49, 59 disposed to the left of the center line 43 of FIG. 2.
  • This provides a more compact construction, and, more importantly, permits a symmetrical location of the three exhaust outlets 51 associated with the single pump means 13, which lead to the three interrupting units 31.
  • the three passages 51 provide a centrally-located, symmetrical Y-shaped fluid inlet conduit structure for substantially balancing the fluid reaction forces in the injecting operation.
  • FIG. 4A illustrates a modified type of arc-extinguishing unit 31A, in which lateral flow of the fluid from piston 15 takes place, as indicated by the arrows. Insulat ing splitters assist in effecting arc extinction.
  • a modified type of circuit interrupter generally designated by the reference numeral 57, and including an elongated tank structure 58 having an elongated cover plate 59.
  • the three pairs of bushings fill-d5 extend downwardly, in pairs, through the elongated cover plate 59.
  • Respective terminal studs 643A A are associated with the terminal bushings rt 65.
  • Current transformers 46 are again employed.
  • the piston device serves to force fluid into the adjacently disposed arc-extinguishing unit 67 in much the same manner, as was described in connection with FIG. 4 of the drawings.
  • rotatable contact arms 68 are utilized. These may, however, in this instance be hinged by connections 69 to contact feet 7tl72 secured to the lower interior ends of the terminal studs 61A, 63A, 65A all to the right of the centerline 73 of the circuit interrupter 57.
  • the three identical arc-extinguishing units 67 may all be disposed to the left of the center-line 73- of FIG. 6, all depending respectively from the lower ends of the terminal studs 69A, 62A and 64A.
  • the lif eds 2013, which may be very similar to the insulating lift-rods 20 of FIG.
  • a horizontal extending isnulating yoke 74 which is vertically actuated by a single insulating lift-rod 75.
  • the lift-rod 75 may extend externally through the top cover plate 59, and may be connected, as at 76, to a bell-crank 77, the latter being actuated by any suitable external mechanism, as well known by those skilled in the art.
  • the downward opening movement of the insulating close yoke 74 will simultaneously efiiect downward movement of the three insulating lift-rods 263. This will permit independent contact separating movement free of the slower travel of the piston 15, as provided by the sliding connection 19 (FIG. 4) within the piston plates 15.
  • the compression spring 16, in each piston device 66 Will effect downward driving motion of the piston 15, forcing fluid, such as sulfur hexafluoride gas, through the exhaust outlet 51 and into the arc-extinguishing units 67, where interruption occurs in the manner previously described.
  • FIGS. 7 and 8 show this slight variation over the interrupting structures illustrated in FIGS. 5 and 6.
  • the operation is the same as described in connection with FIGS. 5 and 6, except that with respect to FIGS. 7 and 8, the piston devices 80 are operable to send fluid in opposite directions through the associated outlets 81, 82 into the two arc-extinguishing units 67, associated with each pole of the modified type circuit interrupter 33.
  • pairs of arc-extinguishing units 67 may be employed, each having its own movable contact 84, the movable contacts being interconnected by a bridging cross-bar construction 85.
  • the disclosed construction has the advantage of employing only a single gas-tight seal for the operating shaft 35, or for the lift-rod 75.
  • a three-phase, fluid-blast circuit interrupter including a grounded dead tank, three pairs of terminal bushings extending into said grounded dead tank, three rotatable crank arms hinged in staggered relation to the interior ends of three of said terminal bushings, three relatively stationary contact structures in staggered arrangement associated with the interior ends of the remaining three terminal bushings, a single centrally located pumping device including an operating cylinder and a piston mov able therein, a centrally-located symmetrical Y-shaped fluid inlet conduit structure including three radially extending inlet conduits associated with said single pumping device and leading adjacent the three relatively stationary contact structures and the pumping device being operable during the opening operation to force fluid simultaneously through the three inlet conduits and radially outwardly toward the three relatively stationary contact structures for are interruption whereby to substantially balance the fluidflow reaction forces.
  • a three-phase, fluid-blast circuit interrupter including a grounded dead tank, three pairs of terminal bush ings extending into said grounded dead tank, three rotatable crank arms hinged in staggered relation to the interior ends of three of said terminal bushings, three relatively stationary contact structures in staggered relation associated with the interior ends of the remaining three terminal bushings, a single centrally located pumping device including an operating cylinder and a piston movable therein, a centrally-located symmetrical Y-shaped fluid inlet conduit structure including piston biasing means, three radially extending inlet conduits associated with said single pumping device and leading adjacent the three relatively stationary contact structures, an insulating lift rod associated with one of the rotatable crank arms, engaging means movable with said lift rod to charge said piston biasing means during the closing operation, and the pumping device being operable during the opening operation to force fluid simultaneously radially outwardly through the three inlet conduits and toward the three relatively stationary contact structures for are interruption whereby to substantially balance the fluid-flow reaction forces.
  • a three-phase fluid-blast circuit interrupter including a grounded tank, three pairs of terminal bushings extending into said grounded tank, three rotatable crank arms hinged in staggered relation to the interior ends of three of said terminal bushings, three relatively stationary contact structures in staggered arrangement associated with the interior ends of the remaining three terminal bushings, a single substantially centrally-located fluid-blast pumping device disposed within said grounded tank and including a relatively stationary operating cylinder and a piston movable therein, an operating rod for operating one of said rotatable crank arms and having a portion thereof composed of insulating material so that said operating rod does not conduct current, said operating rod being movable through said relatively stationary operating cylinder and having a lost-motion connection with said movable piston, a centrally-located symmetrical Y-shaped fluid inlet conduit structure including three radially extending inlet conduits associated with said single pumping device and leading toward said three relatively stationary contact structures, biasing means associated with said piston for moving the same relative to the operating cylinder for forcing fluid out

Landscapes

  • Circuit Breakers (AREA)
US824304A 1959-07-01 1959-07-01 Circuit interrupters Expired - Lifetime US3071670A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US824304A US3071670A (en) 1959-07-01 1959-07-01 Circuit interrupters
DEW27886A DE1156473B (de) 1959-07-01 1960-05-19 Elektrischer Leistungsschalter
CH619260A CH386526A (de) 1959-07-01 1960-05-31 Leistungsschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US824304A US3071670A (en) 1959-07-01 1959-07-01 Circuit interrupters

Publications (1)

Publication Number Publication Date
US3071670A true US3071670A (en) 1963-01-01

Family

ID=25241065

Family Applications (1)

Application Number Title Priority Date Filing Date
US824304A Expired - Lifetime US3071670A (en) 1959-07-01 1959-07-01 Circuit interrupters

Country Status (3)

Country Link
US (1) US3071670A (de)
CH (1) CH386526A (de)
DE (1) DE1156473B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134875A (en) * 1960-02-27 1964-05-26 Asea Ab Rebound preventing means in air blast circuit breaker
US3150246A (en) * 1961-11-02 1964-09-22 Edward I Westmoreland Drop bar multi-break series contact oil switch
US3214550A (en) * 1962-05-02 1965-10-26 Westinghouse Electric Corp Circuit interrupters with crossbars captively related to piston structures
US3381101A (en) * 1965-01-15 1968-04-30 Westinghouse Electric Corp Cross-blast circuit breakers with positive coordination between contact members and puffer structure
US3755637A (en) * 1972-05-15 1973-08-28 Electric S Co Sub-surface switch construction for underground electric power distribution
JPS4872475U (de) * 1971-12-14 1973-09-11
DE2341767A1 (de) * 1972-08-21 1974-03-07 Hitachi Ltd Leistungsschalter mit geerdetem tank
JPS4991756U (de) * 1972-11-28 1974-08-08
US4704508A (en) * 1985-09-30 1987-11-03 Lorenzetti-Inebrasa S/A. Electric arc breaker
JP2019149345A (ja) * 2018-02-28 2019-09-05 富士電機株式会社 回路遮断器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404721C2 (de) * 1974-02-01 1987-01-02 Brown, Boveri & Cie Ag, 6800 Mannheim Elektrischer Druckgasleistungsschalter
DE102010013877B4 (de) * 2009-05-20 2014-07-17 Abb Technology Ag Elektrischer Leistungsschalter und Schaltfeld mit Leistungsschalter
DE102016219812A1 (de) * 2016-10-12 2018-04-12 Siemens Aktiengesellschaft Schaltanordnung

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2095441A (en) * 1934-04-25 1937-10-12 Charles S Hegel Circuit breaker
US2098801A (en) * 1937-03-12 1937-11-09 Gen Electric High voltage electric circuit interrupter
FR850075A (fr) * 1938-02-16 1939-12-07 Reyrolle A & Co Ltd Perfectionnements aux interrupteurs électriques
GB519113A (en) * 1938-07-15 1940-03-18 George Ethelbert Whitehead Improvements in electrical switches and circuit breakers of the gas blast type
US2221720A (en) * 1937-08-25 1940-11-12 Gen Electric Electric circuit interrupter
GB537482A (en) * 1939-12-21 1941-06-24 Reyrolle & Company Ltd Improvements in or relating to electric circuit-breakers of the gas-blast type
US2381592A (en) * 1942-10-17 1945-08-07 John D Hilliard Circuit breaker
FR940814A (fr) * 1947-02-11 1948-12-24 Forges Ateliers Const Electr Disjoncteurs à air comprimé
US2760033A (en) * 1952-11-19 1956-08-21 Westinghouse Electric Corp Circuit interrupter
US2781435A (en) * 1951-03-18 1957-02-12 Heilmann Philipp Arc-extinguishing mechanism for electric switches

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570135C (de) * 1933-02-11 Siemens Schuckertwerke Akt Ges Trennschalter
DE264933C (de) * 1914-04-01
DE671326C (de) * 1937-10-16 1939-02-04 Voigt & Haeffner Akt Ges Schalter mit Lichtbogenloeschung durch Pressluft
DE676421C (de) * 1938-02-10 1939-06-03 Studiengesellschaft Fuer Hochl Leistungsschalter
DE675370C (de) * 1938-05-24 1939-05-06 Studiengesellschaft Fuer Hochl Druckgasschalter mit Differentialkolben

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2095441A (en) * 1934-04-25 1937-10-12 Charles S Hegel Circuit breaker
US2098801A (en) * 1937-03-12 1937-11-09 Gen Electric High voltage electric circuit interrupter
US2221720A (en) * 1937-08-25 1940-11-12 Gen Electric Electric circuit interrupter
FR850075A (fr) * 1938-02-16 1939-12-07 Reyrolle A & Co Ltd Perfectionnements aux interrupteurs électriques
GB519113A (en) * 1938-07-15 1940-03-18 George Ethelbert Whitehead Improvements in electrical switches and circuit breakers of the gas blast type
GB537482A (en) * 1939-12-21 1941-06-24 Reyrolle & Company Ltd Improvements in or relating to electric circuit-breakers of the gas-blast type
US2381592A (en) * 1942-10-17 1945-08-07 John D Hilliard Circuit breaker
FR940814A (fr) * 1947-02-11 1948-12-24 Forges Ateliers Const Electr Disjoncteurs à air comprimé
US2781435A (en) * 1951-03-18 1957-02-12 Heilmann Philipp Arc-extinguishing mechanism for electric switches
US2760033A (en) * 1952-11-19 1956-08-21 Westinghouse Electric Corp Circuit interrupter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134875A (en) * 1960-02-27 1964-05-26 Asea Ab Rebound preventing means in air blast circuit breaker
US3150246A (en) * 1961-11-02 1964-09-22 Edward I Westmoreland Drop bar multi-break series contact oil switch
US3214550A (en) * 1962-05-02 1965-10-26 Westinghouse Electric Corp Circuit interrupters with crossbars captively related to piston structures
US3381101A (en) * 1965-01-15 1968-04-30 Westinghouse Electric Corp Cross-blast circuit breakers with positive coordination between contact members and puffer structure
JPS4872475U (de) * 1971-12-14 1973-09-11
US3755637A (en) * 1972-05-15 1973-08-28 Electric S Co Sub-surface switch construction for underground electric power distribution
DE2341767A1 (de) * 1972-08-21 1974-03-07 Hitachi Ltd Leistungsschalter mit geerdetem tank
JPS4991756U (de) * 1972-11-28 1974-08-08
US4704508A (en) * 1985-09-30 1987-11-03 Lorenzetti-Inebrasa S/A. Electric arc breaker
JP2019149345A (ja) * 2018-02-28 2019-09-05 富士電機株式会社 回路遮断器

Also Published As

Publication number Publication date
DE1156473B (de) 1963-10-31
CH386526A (de) 1965-01-15

Similar Documents

Publication Publication Date Title
US3071670A (en) Circuit interrupters
US2981815A (en) Circuit interrupter
US3845263A (en) Circuit breaker with spring charged operating mechanism
US3214550A (en) Circuit interrupters with crossbars captively related to piston structures
US3009042A (en) Circuit interrupters
US4101748A (en) Modular puffer-type circuit-interrupter unit adaptable for different voltage and current ratings
US2749412A (en) Electric circuit interrupter
US3110791A (en) Circuit interrupter with pressure-generating and interrupting contacts in insulating interrupting tube
US2997564A (en) Circuit interrupter
US4486633A (en) High-voltage Y-shaped dead tank circuit interrupter
US2979589A (en) Circuit interrupters
US3549842A (en) Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US2965735A (en) Compressed-gas circuit interrupter
US3946184A (en) Circuit breaker
US3350528A (en) Dual pressure gas circuit breaker having movable bridging contact connected to blast valve and cutoff valve which are upstream of the movable contact
US3290469A (en) Compressed-gas circuit interrupter having cavitation means
US4000387A (en) Puffer-type gas circuit-interrupter
US2581571A (en) Circuit interrupter
US4440996A (en) Dead tank gas-insulated puffer-type circuit interrupter having interrupting unit in insulated casing
US3071669A (en) Circuit interrupters
US3379849A (en) Dual-pressure gas-blast circuit breaker with piston means and interrupting unit in closed tank
US3582589A (en) Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3214541A (en) Fluid-blast circuit interrupter with straight-line driving mechanism
US2669629A (en) Circuit interrupter
US3291949A (en) Fluid-blast circuit interrupters having improved arc splitter structure