US2783337A - Fluid blast circuit interrupter - Google Patents

Fluid blast circuit interrupter Download PDF

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Publication number
US2783337A
US2783337A US397324A US39732453A US2783337A US 2783337 A US2783337 A US 2783337A US 397324 A US397324 A US 397324A US 39732453 A US39732453 A US 39732453A US 2783337 A US2783337 A US 2783337A
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United States
Prior art keywords
piston
contacts
blast
valve
fluid
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Expired - Lifetime
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US397324A
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English (en)
Inventor
John W Beatty
Reed M Anderson
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General Electric Co
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General Electric Co
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Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US397324A priority Critical patent/US2783337A/en
Priority to GB33323/54A priority patent/GB758505A/en
Priority to DEG15972A priority patent/DE1008384B/de
Priority to CH326728D priority patent/CH326728A/de
Application granted granted Critical
Publication of US2783337A publication Critical patent/US2783337A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs

Definitions

  • the movable contact structure and the blast valve are operatively interconnected by a pneumatic coupling which comprises a cylinder and a pair of oppositely-disposed pistons re-ciprocable therein.
  • a pneumatic coupling which comprises a cylinder and a pair of oppositely-disposed pistons re-ciprocable therein.
  • One of these pistons acts as a driving piston and is coupled to the movable contact structure, whereas the other of the pistons is coupled to the blast valve and acts as a follower piston.
  • Contact opening movement of the driving piston establishes on opposite sides of the follower piston a pressure differential acting in a direction to move said follower piston in coupled follow-up relationship to said driving piston whereby to open the normally-closed 2,783,337 Patented Feb. 26, 1957 blast valve.
  • Means are provided for rapidly reducing this pressure differential after a predetermined opening stroke whereby to release the follower piston so as to permit the blast valve to close.
  • the cylinder has a restricted end portion which confines the gas ahead of the driving piston as it moves toward open position whereby to provide a dashpot action at the end of the opening stroke.
  • Fig. l is an elevational view, partly in section, of a gas-blast circuit interrupter embodying the present invention
  • Fig. 2 is an enlarged sectional view taken along the line 2-2 of Fig. 1
  • Fig. 3 is a detailed view showing a pneumatic coupling constructed in accordance with the present invention
  • Fig. 4 illustrates a modified form of pneumatic coupling
  • Fig. 5 illustrates still another modification of the pneumatic coupling of the present invention.
  • FIG. 1 there is shown a circuit breaker of the gas-blast type comprising an interrupting unit generally indicated at 10.
  • This interrupting unit comprises an enclosed interrupting chamber 11 defined, in part, by a metallic casing 12 and a pair of tubular members 13 and 14 of insulating material mounted at opposed ends of the casing 12.
  • the interrupting chamber 11 communicates through an insulating conduit 15 with a source (not shown) of high pressure gas so that, preferably, the chamber 11 is normally filled with gas at a pressure equal to that of the source.
  • the outer ends of the chamber 11 are sealed by means of terminal plates 20 and 21 supported from the tubular members 13 and 14.
  • tubular members 13 and 14 which are constructed of a material possessing high mechanical strength so as to be capable of withstanding the sustained gas pressure within chamber 11, are preferably enclosed within tubular weather-proof porcelain insulators 22 and 23.
  • tubular insulating column 24 which surrounds the conduit 15 and is preferably of porcelain.
  • the stationary contact structure for the circuit breaker of Fig. 1 comprises, in general, a pair of elongated rod contacts 30 and 31 supported from terminal plates 20 and 21, respectively, and extending inwardly therefrom, and a centrally-disposed pair of electrically interconnected tubular nozzle-type contacts 32 and 33. These pairs of contacts define, at their extremities, a pair of gaps 25 and 26, which are bridged by a pair of pivotally-mounted movable contact blades 34 and 35.
  • the terminal plates 20 and 21 are respectively connected to power lines 36 and 37, so that the electrical circuit through the breaker is as follows: from power line 36 and terminal plate 20, current will flow through the rod contact 30, bridging contact 34, tubular contacts 32 and 33, then through bridging contact 35, rod contact 31, and finally through the terminal plate 21 to power line 37.
  • each of the tubular projections 43 and 44 has a clevis 45 carrying a suitable pivot pin 46 extending freely through an aperture formed in the inner end of the movable bridging contact.
  • a suitable pivot pin 46 extending freely through an aperture formed in the inner end of the movable bridging contact.
  • proper contact-wipe is obtained by forming the extremities of the rod contact 31 and the nozzle contact 33 of a rectangular external cross-section and the bridging contact 35 with spaced arms 47 havingessentially fiat inner surfaces which slidably contact the flat sides of the associated stationary contacts 31 and 33.
  • a reciprocable actuating rod 50 which is connected at its lower end to a suitable operating mechanism (not shown).
  • actuating rod 50 which is of insulating materiahis connected to the pivotal bridging contacts 34 and 35 throughan actuating crosshead 51 secured to the rod 53.
  • This crosshead has at each of its ends a connecting, linkSZ whichis pivotally joined at 54 and 53 to the vcrossheatl and a bridging contact, respectively. by suitable pivot pin structure.
  • a compression spring 55 biases the contacts 34 and 35 toward closed position. Thus, it will be.
  • an-exhaust passage 60 which leads from the interrupting chamber 11 through the tubular contacts 32, 33 and through the cylindrical casting to the surrounding atmosphere.
  • the tubular contacts 32 and 33 are provided with nozzle throats 57 defining inlet-s to the exhaust passage 60.
  • nozzle throats 57 For controlling the flow of arc-extinguishing gas through the nozzle throats 57 and through the exhaust passage 60, there is provided at the outer end ofv the exhaust passage 60 a cylindrically-shaped reciprocable blast.
  • valve 61 which slides smoothly in a surrounding tubular valve housing 62 and abuts, in its closedposition, against a stationary annular valve seat 63.
  • the exhaust passageway 63 is defined by the nozzle throats 57,!the inner walls. of the tubular contacts 32 and .33, the inner walls of cylindrical casting 4d, the cooperating outer wall of a tubular valve housing-62, and the valve. seat63 which issuitably united to casting 4!
  • the blast valve-61 is preferably of the balanced piston type, as shown, and is biased toward a normally-closed position by means of a valve reset spring 64.
  • valve 61 Since the chamber 11 is normally filled with high pressure gas, it will be apparent that when valve 61 is moved downto open (by means described more fully hereinafter) gas in the chamber 11 will flow at high speed through the nozzle throats 57, and out the passage 69 past valve 61 to atmosphere. This rapid flow of gas through the nozzle throats 57 creates an axial arc enveloping blast action at gaps 25 and 26 which is efliective to extinguish the Y arcs drawn thereat.
  • blast valve 61 Itis important that movement of the blast valve 61 be accurately coordinated with movement of the movable contacts 32.and 33; More particularly, in order to effect rapid arc extinction,- it is desirable that thearc-extinguishing-blast action-be initiated somewhat before the arc is established between interrupting contacts. Additionally, in order to conserve gas, it is important that the blast valve. beclosed as. soon as. the circuit has been interruptedfaftenan adequate contact separation. For effectively. andreliably obtaining this desired coordinationbetween themovernent of the. blast valve 5i and the-contacts. 34,- and.35, inv accordance with one form of this invention,- there is provided a pneumatic coupling 65 which operatively interconnects the movable contacts 34, 35 and theblast. valve 61.
  • the pneumatic coupling 65 comprises a stationary enclosing cylinder as and a pair of coaxially disposed cooperating pistonso'l' and 68-reciprocable withinthe cylinder;
  • the lower or driving piston 67 is actuated from .the crossheadSl by means of a piston. rod. 69 connected between piston 67 and crosshead 51'and extending slidably through a sealed opening in the lower end Wall. of the cylinder 66.
  • the upper or follower piston 68 is coupled to the blast valve 61 by means of a piston rod 7% which is connected between pis ton 68' and blast valve 61.
  • the outer peripheries of the reciprocable pistons 6'7 and 68 are sealed with respect to the internal wall of cylinder 65 so that substantially nogas flows past'the pistons around the outer eripheries thereof;
  • conventional piston rings (not shown) may be'used to insure a reliable seal.
  • the cylinder 66 is provided with an inlet port 71 communicating with the interrupter chamber 11 and since the upper piston 68 is provided with a small bleed passage 72 extending therethrough, the gas on both sides of the upper piston 68 is at the same pressure as the gas at the pressure source when the pistons are in the position of Fig. 3.
  • the same pressure also exists below the driven piston 67 by reason of the restricted exit port 80 from the cylinder 66 near its lower end communicating with the casing 11.
  • the upper piston will move downward in follow-up relationship to the lower piston until the valve 61 strikes an annular stop 75, which is supported at the top of the cylinder 66 upon an annular slightly yieldable buffer element 76.
  • downward movement of the upper piston 68 ceases, at an appropriate fully-open valve position, but the lower piston 67 continues to move downward, driven by the breaker operating mechanism.
  • This continued downward movement of lower piston 67 again reduces the pressure between the two pistons and, at the same time, due to the compression of gas in the restricted chamber at the underside of the piston 67, increases the pressure on the underside of pisten 67.
  • the resulting pressure differential across the lower piston 67 thus produces a moderate retarding action which becomes effective during the last portion of the opening stroke. As a result, smooth deceleration of the moving parts of the circuit breaker is effected as the opening stroke is completed.
  • bleed passage 72 This flow through bleed passage 72 tends to equalize the pressure on opposite sides of the follower piston 68 so that after a predetermined downward movement of the follower piston, the pressure differential on opposite sides of this piston is sufficiently reduced to permit valve reset spring 64 to predominate whereby to return the follower piston and the blast valve to the closed-valve position.
  • the bleed passage 72 is of such a size that in approximately 3 cycles sufiicient gas flows through passage 72 to effect the reversal of the follower piston and the blast valve.
  • the pneumatic coupling 65 not only serves to effectively coordinate the movement of the valve 61 and the contacts 34, 35 in the desired manner, but also serves as an efiective dashpot for smoothly decelerating the moving parts of the circuit breaker at the end of opening stroke.
  • Fig. 4 illustrates an alternative arrangement for obtaining the desired independence of motion between valve 61 and contacts 34, 35 at a predetermined point in the opening stroke.
  • Parts in Fig. 4 which correspond to the parts of Fig. 3 are designated by corresponding reference numerals.
  • a release port 80a which is relatively large compared to the port 80 of Fig. 3, is provided for interconnecting the interrupter chamber 11 in the interior of cylinder 66.
  • This port 80a is preferably disposed slightly above the lowermost position 81 (shown in dotted lines) that the driving piston 67 will occupy at the end of its opening stroke.
  • Fig. 5 illustrates still another modification of the present invention wherein the parts corresponding to the avssgasv parts .ofJFig. 1 aredesignated by corresponding reference numerals.
  • This modification differs from those previously described, principally by reason of the fact that in Fig. 5 the actuating means for the circuit breaker is incorporated directly into the pneumatic coupling structure instead of being. separate .therefrom.
  • Fig. 5 shows a pneumatic coupling90 connected between the blast valve oland the crosshead 51', as in Fig. 1, but in Fig. 5 opening movement fromthe closedcontact position shown is produced by dumpinggas from the closed cylinder below the lower piston 91 by means of a two-way control valve 92 controlled by suitable fault-responsive means (not shown).
  • Sustained-pressure interrupting chamber 11 communicates freely with. the supply reservoir 88 by means of conduit 88a, so that when the pistons are inthe contact-closed position shown, the gas .on. both sides of lower or: driving piston 91 is at a pressure corresponding to the. pressure in supply reservoir 88.
  • Closing operation of the circuit breaker of Fig.5 may be effected by returning control valve 92 from venting position 95a to the solid line position, thereby supplying high pressure gas to the underside of lower piston 91.
  • This high pressure gas acting together with the'spring 55 moves the piston 91 upwardly, whereby to close the contacts of the circuit breaker.
  • the check .valve 99 disposed in upper piston, 95 permits the lower piston 91 to move upwardly without appreciable retardation resulting from the air in the coupling space ahead of the upwardly moving piston 91.
  • a fluid-blast circuit interrupter comprising separable contacts, a blast valve movable to control the flow of fluid adjacent said contacts, an actuating member movable to effect separation of said contacts, fiuid cou pling cylinder structure, a follower piston movable in said cylinder structure and coupled to said blast valve, a driving piston disposed in said cylinder structure and movable with said actuating member through a predetermined stroke, said cylinder structure having an essentially closed wall portion slidably and sealingly receiving said pistons to restrict entry of fluid into the space between said pistons during at least a portion of said stroke thereby to couple said pistons to move substantially together during said portion of the stroke.
  • a fluid-blast circuit interrupter comprising separable contacts, a blast valve movable to control the flow of fluid adjacent said contacts, an actuating member movable to effect separation of said contacts, fluid coupling cylinder structure, a follower piston movable in said cylinder structure and coupled to said blast valve so as to occupy a first predetermined position when said valve is closed, a driving piston disposed in said cylinder structure and coupled to said actuating member so as to occupy a second predetermined position when said contacts are closed, Lsaid cylinder structure having an essentially closed wall portion which extends between said predetermined positions of said pistons and sealingly receives said pistons so as to restrict the flow of fluid into the space between said pistons whereby movement of said driving piston away from said follower piston reduces the fluid pressure in the space between said pistons whereby to move said follower piston in coupled follow-up relationship to said driving piston.
  • a fluid-blast circuit interrupter comprising relatively movable contacts, an actuating member for moving one of said contacts through an opening stroke between a closed and a fully-open position, a biased closed blast valve openable to provide a flow of fluid adjacent said contacts during said opening stroke, fluid coupling comprising a follower piston operatively connected to said blast valve and means comprising a driving piston movable with said actuating member for establishing on opposite sides of said follower piston a pressure differential acting in a direction to movesaid-followerpiston in follow-up relation to said driving piston during said opening stroke thereby to open said blast valve during said opening stroke, and release means eifective after a predetermined portion of said opening stroke for reducing said pressure differential whereby to permit said biased closed blast valve to return to its closed position.
  • a fluid-blast circuit interrupter comprising separable contacts, a blast valve movable to control the flow of fluid adjacent said contacts, an actuating member movable to effect separation of said contacts, a fluid coupling operatively interconnecting said blast valve and said actuating member, said fluid coupling comprising cylinder structure, a follower piston disposed in said cylinder structure and operatively connected to said blast valve and means comprising a driving piston movable with said actuating member to establish on opposite sides of said follower piston a pressure differential acting in a direction to cause said driven piston to move in follow-up relation to said driving piston, said driving piston being movable between a first position wherein the contacts are closed and a second position wherein the contacts are fully-open, said cylinder structure having adjacent said second position a restricted end portion cooperating with said driving piston to retard said driving piston as it moves into said second position.
  • fluid coupling comprising cylinder structure, a driving piston movable in said cylinder structure and operatively connected to said actuating member and a follower piston movable in said cylinder structure and operatively conneoted to said blast valve, said driving piston being movable through a predetermined stroke corresponding to relative movement of the contacts from a closed to a fullyopen position, pressure control means for causing said follower piston to move in follow-up relationship to said driving piston, and stop means limiting the movement of said follower piston to a stroke which is shorter than said predetermined stroke for said driving piston.
  • a stationary nozzle-type contact of tubular configuration a second contact disposed in generally axially-aligned relationship with said tubular contact and spaced therefrom to define a gap between said contacts, a cooperating movable contact member mounted for pivotal movement toward and away from said gap, said movable contact member having a bridging portion which bridges said gap when the contact member has been moved toward said gap and which is spaced from said gap when the contact member has been moved away from said gap, means including an actuating member connected to said contact member for producing pivotal movement of said contact member toward and away from said gap, and means operable upon movement of said contact member away from said gap to produce a fluid blast which flows through said gap and then into said nozzle type tubular contact.
  • a circuit interrupter comprising a plurality of generally axially-aligned pairs of stationary contacts defining a pair of gaps, a pair of cooperating movable contact members each having a bridging portion which bridges one of said gaps, each of said movable contact members being pivotally mounted on pivot structure, actuating mechanism for producing simultaneous movement of said movable contacts, said actuating mechanism comprising a reciprocable c'ross-headimember whichis. connected to. each of. said movable contact membersat atpoint on. the movable contactv memberilocated between. said pivot structure andsaid bridgingiportion.
  • Afluid-blast. circuitinterrupter comprising separable contacts, a. blastsvalve movable tocontrol the flow of fluid adjacent said'contacts, anactuating member movable to separatesaid contacts, a fluid coupling containing fluid under pressure and operativelyinterconnectingsaid blast valve and said actuating member, said coupling comprisinga followerpiston operatively connected to said blast valve and means comprising a driving piston movable with saidactuatingmember to establish a pressure diflerential. on opposite sides of said driven piston. so as to cause,saidfollowerpiston to move in follow-up relation to said driving piston, flow control. means for exhausting the space at one side of said driving piston to a region lower pressure whereby said" driving piston acts as the driving means for said actuating member.
  • a fluid-blast circuit interrupter comprising separable contacts, a blast valve movable .to control the flow of fluid adjacent said contacts, an actuating member movable to separate said contacts, a fluid coupling containing fluid under pressure and operatively interconnecting said blast valve and said operating mechanism, said fluid coupling comprising a follower piston operatively connected to said blast valve and means comprising a driving piston movable with said actuating member to establish a pressure differential on opposite sides of said follower piston acting in a direction to cause said follower piston to move in follow-up relation to said driving piston, flow control means for producing a reduced pressure on one side of said driving piston whereby said driving piston acts as-the driving means for said actuating member, means for maintainingsaid reduced pressure on said" one isideiofz. said .id'riving piston: when said. contacts are: fully-open whereby 'to hol'd .said contacts in .fullyopen position;
  • said flow control means comprises'a passageextending from said cylinder, and said driving piston havingra portion which seals ofi said passage when the drivingpiston is moved to a position corresponding to the fully-open contact position whereby the contacts are-held infully-open position by fluid pressure within said cylinder.
  • a fluid blast. circuit interrupter separable contacts, a normally-closed blast valve movable to an open position toproduce a flow of Ifluid adjacent said con-. tacts, cylinder structure, a first piston coupled to said blast valve and" movable within said 'cylinder structure inone direction to open said blast valve, a second piston coupled to one of said contacts and movable Within said cylinder structure in the same direction as said first piston during opening of said contacts, means for releasably coupling said pistons together for movement in the same direction duringa contact-opening operation, and means responsive to movement'of said contact-coupled piston in said one direction to admit pressurized fluid into a space betweensaid two'pistons whereby'to release the coupling between said pistons andthus allow the valve to close.

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  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US397324A 1953-12-10 1953-12-10 Fluid blast circuit interrupter Expired - Lifetime US2783337A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US397324A US2783337A (en) 1953-12-10 1953-12-10 Fluid blast circuit interrupter
GB33323/54A GB758505A (en) 1953-12-10 1954-11-17 Improvements in gas blast electric circuit interrupters
DEG15972A DE1008384B (de) 1953-12-10 1954-12-06 Druckgasschalter
CH326728D CH326728A (de) 1953-12-10 1954-12-10 Unterbrecher mit pneumatischer Lichtbogenlöschung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US397324A US2783337A (en) 1953-12-10 1953-12-10 Fluid blast circuit interrupter

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US2783337A true US2783337A (en) 1957-02-26

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US397324A Expired - Lifetime US2783337A (en) 1953-12-10 1953-12-10 Fluid blast circuit interrupter

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US (1) US2783337A (de)
CH (1) CH326728A (de)
DE (1) DE1008384B (de)
GB (1) GB758505A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060294A (en) * 1957-10-30 1962-10-23 Westinghouse Electric Corp Circuit interrupter
US3167630A (en) * 1959-06-02 1965-01-26 English Electric Co Ltd Multi-break gas blast circuit breaker and operating means therefor
US3243560A (en) * 1963-07-16 1966-03-29 Gen Electric Electrical apparatus using pressurized air as a dielectric and having air drying means incorporated therein
US3258569A (en) * 1961-02-15 1966-06-28 Westinghouse Electric Corp Truck-mounted compressed-gas circuit interrupter with tank-enclosed interrupting units and blast tubes in spaced vertical planes
US3291947A (en) * 1964-06-12 1966-12-13 Westinghouse Electric Corp Interrupting structures for compressedgas circuit interrupters having double-break hollow rotative moving contact-arm assembly
US3336454A (en) * 1964-12-29 1967-08-15 Gen Electric Means for controlling the blast valve of a gas blast circuit breaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH360712A (de) * 1958-06-28 1962-03-15 Bbc Brown Boveri & Cie Leistungsschalter mit niederohmigen Widerstand

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303825A (en) * 1941-09-18 1942-12-01 Gen Electric Electric circuit breaker
US2413555A (en) * 1945-01-06 1946-12-31 Vickers Electrical Co Ltd Electric circuit interrupter
US2454586A (en) * 1945-12-18 1948-11-23 Reyrolle A & Co Ltd Gas-blast electric circuit breaker
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
US2670411A (en) * 1949-11-28 1954-02-23 Allen Bradley Co Autotransformer starter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE305797C (de) *
DE288168C (de) *
DE504736C (de) * 1928-09-19 1930-08-07 Aeg Elektrischer Schalter, dessen Kontakte durch Druckgas beblasen und bewegt werden
DE662401C (de) * 1934-06-15 1938-07-13 Voigt & Haeffner Akt Ges Anordnung zur Steuerung der Druckgaszufuhr bei Schaltern mit Lichtbogenloeschung durch Druckgas
DE659030C (de) * 1936-10-21 1938-04-22 Aeg Schalter mit Lichtbogenloeschung durch stroemendes Druckgas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303825A (en) * 1941-09-18 1942-12-01 Gen Electric Electric circuit breaker
US2413555A (en) * 1945-01-06 1946-12-31 Vickers Electrical Co Ltd Electric circuit interrupter
US2454586A (en) * 1945-12-18 1948-11-23 Reyrolle A & Co Ltd Gas-blast electric circuit breaker
US2670411A (en) * 1949-11-28 1954-02-23 Allen Bradley Co Autotransformer starter
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060294A (en) * 1957-10-30 1962-10-23 Westinghouse Electric Corp Circuit interrupter
US3167630A (en) * 1959-06-02 1965-01-26 English Electric Co Ltd Multi-break gas blast circuit breaker and operating means therefor
US3258569A (en) * 1961-02-15 1966-06-28 Westinghouse Electric Corp Truck-mounted compressed-gas circuit interrupter with tank-enclosed interrupting units and blast tubes in spaced vertical planes
US3243560A (en) * 1963-07-16 1966-03-29 Gen Electric Electrical apparatus using pressurized air as a dielectric and having air drying means incorporated therein
US3291947A (en) * 1964-06-12 1966-12-13 Westinghouse Electric Corp Interrupting structures for compressedgas circuit interrupters having double-break hollow rotative moving contact-arm assembly
US3336454A (en) * 1964-12-29 1967-08-15 Gen Electric Means for controlling the blast valve of a gas blast circuit breaker
US3336453A (en) * 1964-12-29 1967-08-15 Gen Electric Means for controlling the blast valve and contacts of a gas blast circuit breaker

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Publication number Publication date
GB758505A (en) 1956-10-03
DE1008384B (de) 1957-05-16
CH326728A (de) 1957-12-31

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