US2532529A - Fluid-blast electric circuit breaker - Google Patents

Fluid-blast electric circuit breaker Download PDF

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Publication number
US2532529A
US2532529A US3243A US324348A US2532529A US 2532529 A US2532529 A US 2532529A US 3243 A US3243 A US 3243A US 324348 A US324348 A US 324348A US 2532529 A US2532529 A US 2532529A
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Prior art keywords
contact
enclosure
contacts
fluid
breaker
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Expired - Lifetime
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US3243A
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English (en)
Inventor
Amer Donald Foster
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A Reyrolle and Co Ltd
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A Reyrolle and Co Ltd
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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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7092—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by several arcing chambers in series
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • 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
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H01H33/83—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas wherein the contacts are opened by the flow of air or gas

Definitions

  • one or each of the vco-operating contacts is located by a' flexible or resilient device (such for example vas a diaphragm, bush or bellows), situated within the arcing chamber or enclosure so thatfrictional sliding or guide surfaces for the contact or contacts can be obviated.
  • a flexible or resilient device such for example vas a diaphragm, bush or bellows
  • the contacts may separate adjacent to at least one nozzle or vent 'through which the arc is driven by the blast ofv arcexting'uishing huid from the enclosure.
  • one or each of the cooperating ⁇ contacts may itself constitute a nozzle or vent.
  • the co-o-perating contacts carry the relatively movable parts of a duid-tight valve which controls the flow of arcquenching fluid from the enclosure to an exhaust conduit or conduits formed, for example, in one or each of the co-operating contacts.
  • FIGS 1 to 3 are diagrammatic representations, in vertical section, of three arrangements of single-break circuit-breaker embodying the invention
  • Figure 4 shows, also in vertical section, one unit of a high voltage multi-break circuit-breaker having a plurality of circuit-breaker units arranged in .a series stack.
  • Figure 5 is a diagrammatic representation of such multi-break circuit-breaker with contact control by pressure release( Figure 6 similarly illustrates a modification of Figure 5 in which each pair of co-operating oontacts together form a fluid-tight seal, and
  • Figure 7 is a modication of Figure 6, the contact lcontrol being effected by control of the supply of pressure nuid.
  • the sinn gle-break circuit-breaker comprises a fixed arcing Contact A disposed coaxially within lan externally shedded cylindrical insulating enclosure B, the lower end of the fixed contact A. being electrically connected to a spider A1 carried by the enclosure B and constituting one pole X of the circuitbreaker.
  • a metallic nozzle member or cap C which incorporates a nozzle C1 Whose axis is substantially in alignment with the axis of the xed contact A, the nozzle C1 haring towards an auxiliary electrode D electrically connected to the nozzle member C. Disposed laterally with respect to the fixed contact A and adjacent to the 14 Claims.v (Cl.
  • nozzle C1 is a moving Contact E carried by a ilexihle diaphragm, disc or bellows (dagrammatically indicated at E1) of conducting material arranged When the circuit-breaker is to be opened, an
  • inlet ⁇ control valve F1 at the base of the enclosure B is opened so that pressure uid, for example air under pressure, is supplied from a receiver or reservoir F to the interior of the enclosure B.
  • pressure uid for example air under pressure
  • the uid pressure within the enclosure B now acts on the diaphragm E1 and thus causes the moving contact E to be retracted from the xed Contact A.
  • the arc initiated between the fixed and moving contacts A, E is now transferred, by the blast of deionising fluid, from the moving contact E to the nozzle member C and, through the nozzle C1, to the auxiliary arcing contact D, the arc being thus extinguished.
  • the inlet control valve F1 is closed, the moving contact E will be automatically restored to its closed position.
  • valve F1 and a series break isolating switch indicated at Z are sequentially controlled so that when the arc has been extinguished the isolating switch Z is opened before the valve F1 is reclosed, re-establishment of the circuit being subsequently effected by closing the isolating switch Z.
  • the locating device El is of conducting material or of insulating material, however, it will be understood that the flow of deionising iluid through the enclosure B to the nozzle C1 will tend to sweep the products of arcing away from the iiexible locating device El thus tending to protect this device against the elects of arcing.
  • the insulating enclosure G is furnished with a contact ring or spider G1 which constitutes one pole X of the circuit-breaker, the spider G1 carrying a iixed contact G2 disposed coaxially within the enclosure G, Arranged in alignment with the fixed contactv G2 and secured to ia second lixed spider H1 carried by the enclosure G (this spider H1 constituting the second pole Y of the circuitbreaker) is a hollow or tubular carrier I-I for a moving contact ring H2 which is located on the tubular carrier by a flexible disc H3 of conducting material, or oi insulating material such, for example, as rubber' bonded to the contact VH2 and carrier H.
  • the flexible locating device ⁇ is of conducting material this device itself forms rthe necessary electrical connection with the tubular 0r .hollow contact I.carrier H and ,therefore with the -second pole Y of the .circuit-breaker, ⁇ but if the -flexible locating device H3 is c-f insulating material, the necessary electrical contact may be provided by one ior more flexible leads H5 arranged within the hollowcontact .carrier H.
  • the spider 4H1 is provided .with an exhaust passage H6 so that,-assuming .the :contacts G2H2 t obe .in mutual abutment and .it .is desired to open the circuit-breaker, .the 'inlet control valve E1 is opened so that duid is delivered from .the reservoir F to the enclosure G.
  • the pressure .of the ⁇ fluid in the enclosure G then acts on the flexible or resilient locating -device ⁇ I-I3 .so as to separate the contacts G2H2 against the action of thebiasing spring :l-I4.
  • a blasto fluidthen ows from'the -enclosure G-between the contacts G2H2 and thence out through the exhaust passage H6 to vthe atmosphere.
  • the moving vcontact H2- may bein the forni of a nozzle so lthat the arc initiatedbetween the contacts ⁇ G2H2 when they separate .is transferred through Vthe nozzle and is thus extinguished.
  • leither the xed contact or the moving contact, or both, may be v'hollow and nozzle-like, though it will usually be preferred to make the ixed 4contact in the form of .a nozzle, for example'as will be described below with ureference to Figures 3 and 4.
  • each of the two spiders J, K is hollow, so as to provide for the exhaust or release of pressure fluid therefrom.
  • one spider J carries a hollow fixed contact J1 having its open end J2 within the enclosure J3 formed as a nozzle.
  • the second spider K carries a hollow fixed tube K1 in axial alignment with the hollow contact J1.
  • a movable contact K2 locat-ed on. the carrier K1 by a flexible or resilient locating device K3 in the form of a disc, bush or bellows.
  • the movable contact K2 may either be electrically connected to its hollow carrier K1 by the locating device K3 if this is of conducting material or, if the device :Kiiseo'f insulating material (for example a rubber disc), the movable contact K2 may be connected to the spider K through one or more flexible leads K4 disposed within the ltubular :carrier K1 which also houses a biasing springK5 for restoring the moving con- .tact ⁇ K2 to its closed position after opening of the contacts.
  • the hollow carrier K1 has a relief passage K6 communicating with a relief conduit provided with an Voutlet control valve K'I so that, when the fluid pressure is maintained within the enclosure U3 from a supply conduit J4, opening of the outlet control valve K7 will result in the predominating flu-id pressure within the enclosure 'J3 acting .to separate .the .contacts ⁇ J2K2.. As the two contacts separate, ⁇ a .blast .of .deionising .fluid ilows over .the separating ⁇ contacts and thence through the carrier J1 to the atmosphere.
  • the carrier K1 is in open .communication with the enclosure YJ3 through a bleed passage J 6 so that, after opening the circuit-breaker ⁇ and reclosing the outlet 4)control valve K7, pressure fluid will leak through the bleed passage ⁇ J6 until the .pressure in the .hollow carrier K1 is again euual to vthatv within the enclosure J3 -in readiness -for the next opening operation;
  • Vr-lhe invent-ion is particularly, though not ex clusively, applicable -to circuit-breakers of the multiebreak type comprising a plurality of Acontact Aunits arranged in an aligned series or stack.
  • each contact unit is larranged -in a cylindrical sbeded enclosure B1 furnished with an external harige-like metal annulus B2 .having .an exhaust port or ports B4 through which the arc ⁇ @clenching fluid is discharged through an exhaust valve B3 of the flap type.
  • rIhe lannulus B2 which constitutes one terminal of the unit, forms par-t foi a conducting Vspider A3 having a cylindrical lcarrier A2 disposed coaxial'ly within the enclosure B1.
  • rihe upper or open end A4 yof the hollow carrier A2 is formed into a .nozzle-like contact, and an auxiliary arcing electrode D1, which is also hollow, is arranged within the xed contact A2 in alignment with. but spaced below, the contact A4.
  • vA disc-like moving contact D2 is secured 'to the lower end of the hollow carrier A2 by means of a ilexihle locating device D3, such for example as a disc of copper, the moving contact D2 having an axial anchorage stud D4 connected through adjusting nuts AD5 and 'an anchorage chain Ds to the interior of the auxiliary arcing electrode D1.
  • a biasing spring D7 bears at its, lower end against the assembly vof the movn ing contact D2 and at its upper end against an in# ternal flange or shoulder D8 of the auxiliary arcing electrode D1, the travel of the moving contact D2 under the action of the biasing spring Drl being thus Vlimited by the eiective length of the anchorage chain D6 as determined by the adjusting nuts D5.
  • the iixed contact A2, A4, auxiliary electrode D1 therein, the movable contact D2 immediately below the fixed contact, and the terminal annulus B2 with whose exhaust port or ports B4 the-interior of the carrier A2 isl in open communication together constitute one contact unit associated with one enclosure B1, and it is to be understood that this unit, all parts of which are at the same potential, does not' in itself constitute a break.
  • the blast of deionizing uid transfers the ,arcs ,initibetween the separating contacts through the nozzles A4 to the associated auxiliary arcing electrodes D1, the uid blasts iinally extinguishing the arcs whereupon the closing of the inlet control valve F1 and resulting fall in pressure within the several enclosures B1 permits the moving contacts D2 to be restored into abutment with their associated lixed contacts A4 by the'springs DT.
  • the resilient locating device D3 for the moving contact D2 of each unit obviates the necessity for any frictional slidingr or guide surfaces for any of the contacts. It will, however, be understood that though a metal disc or diaphragm has been more specifically described, the iiexible or resilient locating device D3 may be constituted by a diaphragm of insulating material such, for example,
  • the locating device D3 is of insulating material the electrical continuity between the contact A2 and the moving contact D2 of each contact unit may be provided by one or more flexible leads D8 arranged within the hollow auxiliary arcing electrode D1.
  • the shedded insulating enclosure B1 for eac contact unit is so formed that the external surface resistance path of each shed B exceeds that of the cylindrical parts B8 of the enclosure so that the greater part of the said surface resistance is at right angles to the longitudinal axis of the' enclosure, or stack of alignedenclosures.
  • a resistance or capacitance may ⁇ be connected across each break of the multi-break series stack so that the voltage is substantially uniformly distributed over all the breaks, V'I'he resistances are constituted by an external semi-conducting glass on the shedded enclosures B1 so that the resistance between any two corresponding points on any two sheds B7 respectively is the same as or proportional to that between such corresponding points o n any other two sheds B7.
  • Tharesistance' glaze combined with mainly radial insulation, permits the use of metal parts of adequate dimensions without increasing the length of the stack of contact units.
  • the radial formation of the insulator sheds BI providing adequate surface length between the metal iittings (i. e. the terminal annuli B2, B6) for the voltage distribution to be controlled by the resistance glaze.
  • the edges of the sheds B'I are at a potential approximately midway between those of the associated metal ttings and the overall length necessary is no more than the sum of the overall lengths of the units since the said overall length of the stack is determined by the lll) distance between the ends of the sheds BFI and not by the distance between the metal ttings B2, B6.
  • each contact unit comprises a hollow fixed contact M1 electrically connected to the moving contact L below it as described with reference to Figure 4 above.
  • An associated hollow or tubular auxiliary arcing electrode M2 is arranged within the. nozzle-like fixed contact M1, the exhaust passage M2 for each nxed contact M1 being formed in the associated supporting spider M4 and terminal annulus.
  • each tubular auxiliary arcing electrode M2 being in open communication with the interior of the enclosure through a bleed passage such as the passage J6 shown in Figure 3.
  • the pressure within the relief conduit F4 is equal-to that within the stacked enclosures M.
  • the outlet control valve F3 is opened and the iluid pressure within the tubular auxiliary electrodes M2 thus relieved.
  • the predominating uid pressure within the enclosures M is now eiective to separate the contacts L, M1. so that the blasts of deionising uid ilow between the separating contacts and out through the exhaust conduits M3.
  • circuit-breakers of Figures 2 to 5 will be provided with series-break isolating switches such as theswitch Z described with reference to Figure l,the isolating switch and uid control valve being actuated se uen.- v tially, for example as shown diagrammatically in Figure 5 in which the valve F3 is actuated by a rod P6 which acts through a lost-motion coupling Plon the isolator Z.r
  • each diaphragm vL1- coecperates Aas a resilient 'huidaigiht seating' with a Ysea-ting flange' Mion the asso fixed' contact-.M1--
  • the interiors of vall the ⁇ enclos res M are at the same pressure as that wit' in the reservoir O which 'pressure also obv'fithin' the passage F4 by reason of thel bleed passages M8..
  • blast pipe P1 is provided 'with an inlet control :1'
  • valve P2 operated by "a control piston P3, itself controlled by a trip valve P5, in the base F6.
  • An air break isolating switch Q whose actuating spindle Q1 lies within a controllchanrber N1 in terposed between the stack of enclosures N and the top of the post insulator P, is operated through a spiral Ygear P6 by a piston P7 controlled, for opening the switch Q, by the piston P3 and, -or closing of the said switch, by a closing valve P3.
  • each moving contact R1 is carried by a resilient rubber diaphragm R which forms a fluid-tight seating in .co-'operation with a flange S1 on a fixed hollow contacts.
  • the inlet control valve P2 in the blast pipe VP1 When the circuit-breaker is in the closed condition, the inlet control valve P2 in the blast pipe VP1 is closed and the series break isolating switch Q is also in the closed position. Ii now, the circuit-breaker is to be opened, the trip valve PET is opened so that the piston P3 is lowered and the valve P2 thus opened so that the pressure fluid within the stack of enclosures N lifts the diaphragm R and 'moving contacts R1 thereby causing a blast of deionising iluid to now first over the separated seatings R, S1 and thence through the nozzle-like fixed contacts S to the exhaust conduits s2.
  • the piston P3 permits pressure gas to flow into the cylinder above the piston P'I which movesY down and acts through a rotary vertical operating shaft l?4 and a worm and rack ⁇ P9 within the chamber N1 on the spindle Q1 s0 that the switch Q is opened.
  • the inlet control valve P2 is now closed so that the circuitbreaker contacts R1, S automatically reclose under the action of the biasing springs.
  • the circuit-breaker is now ready for reclosingV of vthe circuit by means of the valve P8 controlling the isolating switch Q.
  • the invention not only obviates the necessity for providing frictional sliding' or .guide surfaces for thev contacts, which surfaces are vulnerable to; thev eiects of' arcing, but ensures that the moving contact of the circuit-breaker cannot be operated to initiate the arc unless and until the iiliidgp-ressureY necessary to provide the requisite uid" blast at the break is available a-t the.
  • a circuit-breaker unit for a multi-break fluid-'blast circuit-breaker having a plurality of circuit-breaker units arranged in an aligned assembly or stack, comprising a contact enclosure means whereby fluid under ⁇ pressure is supplied 'to the enclosure, two cooperating contacts arranged within said enclosure, at least one of said contacts being movable, 'a resilient device supporting said movable contact and constituting the sole guiding means therefor, and means forl electrically connecting each of said contacts tothe adjacent contact of the next circuit' breaker unit oi' the aligned assembly or stack.
  • a ycontact unit for a multi-break fluidbla'st circuit-breaker having a plurality of contact'un'its' arranged in a series assembly or stack comprising a contactenclosuremeans whereby fluid under pressure is 4supplied vto the enclosure, a movable contact Aoperated by the fluid pres sure within the enclosure and'ar'ranged' within and towards 'one end'ofy the enclosure, a ilexible mounting device within Vthe enclosure and iconstituting the 'sole guiding means for said mov able Contact within the enclosure, a xed contactv arranged within and towards the other end of the enclosure, and means electrically 'inter-L- connecting the said fixed and' movable contacts whichk respectively cooperate with the corresponding movable and xed contacts of the adjacent units in the stack.
  • a multi-break fluid-blast electric circuitbrealrer having a plurality of contact units arranged in an aligned assembly or stack to give a plurality of breaks in series, comprising a plurality or" contact units arranged end to end and in open mutual communication, each unit including a Contact enclosure means whereby uid under pressure is supplied to the enclosure, a movable contact operated by the fluid pressure within the enclosure and arranged within and towards one end of the enclosure, a flexible mounting device within the enclosure and which constitutes the sole guiding means for said movable contact within the enclosure, a iixed contactl arranged within and towards the other end of the enclosure, and means electrically interconnecting the said i'lxed and movable contacts which respectively cooperate with the corresponding movable and xed contacts of the adjacent units in the stack.
  • a multi-break fluid-blast electric circuitbreaker having a plurality of contact units arranged in an aligned assembly or stack to give a plurality of breaks in series, comprising a plurality of contact units arranged end to end in open mutual communication, each unit including a Contact enclosure, a movable contact arranged within and towards one end of the enclosure, a flexible mounting device within the enclosure and which constitutes the sole guiding means for said movable contact within the enclosure, a xed ContactI arranged within and towards the other end of the enclosure, two seating surfaces carried respectively by the two contacts, which seating surfaces respectively cooperate as fluid-tight valve seatings with the corresponding seating surfaces on the contacts of the adjacent units of the stack, and means electrically interconnecting the said xed and movable contacts which respectively cooperate with the corresponding movable and fixed contacts of the adjacent units in the stack.
  • a duid-blast electric circuit-breaker comprising a contact enclosure, means whereby fluid under pressure is supplied to the said enclosure, a rigidly fixed contact within the enclosure, a movable contact within the enclosure and cooperating therein with the fixed contact, at least one of said contacts having a gas-discharge vent therein, whilst the movable contact is operated solely by the fluid pressure within the enclosure, and a resilient device within the enclosure and supporting the movable contact therein, the movement of the movable contact being guided solely by said resilient device, so that frictional sliding or guide surfaces for the moving contact, as well as operating mechanism therefor, are obviated.
  • fluid-blast electric circuit-breaker comprising a contact enclosure, means whereby fluid under pressure is supplied to the enclosure, a rigidly fixed contact within the enclosure, a movable contact within the enclosure and cooperating therein with the iixed contact, at least one of said contacts having a gas-discharge vent therein whilst the moving contact is operated solely by the fluid pressure within the enclosure, and a exble metal diaphragm within the enclosure and supporting the movable contact therein, the movement of the movable contact being guided solely by said diaphragm, so that frictional sliding or guide surfaces for the moving contact, as well as operating mechanism therefor, are obviated.
  • a fluid-blast electric circuit-breaker comprising a contact enclosure, means whereby fluid under pressure is supplied to the enclosure, a rigidly xed contact within the enclosure, a movable contact within the enclosure and cooperating therein with the xed contact, at least one of said ⁇ contacts having a gas-discharge vent therein whilst the moving contact is operated solely by the fluid pressure within the enclosure, and a flexible rubber diaphragm within the enclosure and supporting the movable contact therein, the movement of the movable contact being guided solely by said diaphragm, so that frictional sliding or guide surfaces for the moving contact, as well as operating mechanism therefor, are obviated.
  • a fluid-blast electric circuit-breaker comprising a contact enclosure, means whereby iluid under pressure is supplied to the enclosure, and a rigidly fixed contact within the enclosure, a movable Contact within the enclosure and cooperating therein with the fixed contact, at least one of said contacts having a gas-discharge vent therein, means whereby the movable Contact is operated solely by the fluid pressure Within the enclosure, a resilient device within the enclosure and supporting the movable contact therein, the movement of the movable contact being guided solely by said resilient device so that frictional sliding or guide surfaces for the moving contact, as well as operating mechanism therefor, are obviated, and seatings carried by the two contacts respectively, the said seatings constituting relatively movable parts of a fluid-tight valve which controls the flow of arc quenching duid from the enclosure to the said discharge vent.

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  • Circuit Breakers (AREA)
US3243A 1947-02-03 1948-01-20 Fluid-blast electric circuit breaker Expired - Lifetime US2532529A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB272397X 1947-02-03
GB140148X 1948-01-14

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US2532529A true US2532529A (en) 1950-12-05

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US3243A Expired - Lifetime US2532529A (en) 1947-02-03 1948-01-20 Fluid-blast electric circuit breaker

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US (1) US2532529A (de)
BE (1) BE480095A (de)
CH (1) CH272397A (de)
FR (1) FR960347A (de)
GB (1) GB620941A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10276318B1 (en) 2013-03-15 2019-04-30 Innovative Switchgear IP, LLC Insulated switch

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965551A (en) * 1931-07-06 1934-07-03 Bbc Brown Boveri & Cie Electric circuit breaker
US2069222A (en) * 1934-03-19 1937-02-02 Robert M Cremer Signal
US2111168A (en) * 1935-03-04 1938-03-15 Chansor John Flexible corrugated diaphragm
US2260188A (en) * 1940-03-27 1941-10-21 Milliken Humphreys Gas-blast circuit breaker
US2279536A (en) * 1938-05-27 1942-04-14 Bbc Brown Boveri & Cie Electric circuit breaker
US2293319A (en) * 1940-05-06 1942-08-18 Bbc Brown Boveri & Cie Electrical circuit interrupter
US2336316A (en) * 1940-06-08 1943-12-07 Bbc Brown Boveri & Cie High voltage electric circuit breaker
USRE22420E (en) * 1944-01-18 Method of stimulating plants
US2365131A (en) * 1940-06-17 1944-12-12 Reyrolle A & Co Ltd Alternating current electric circuit breaker of the gas-blast type
US2394046A (en) * 1942-12-10 1946-02-05 Westinghouse Electric Corp Circuit interrupter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE22420E (en) * 1944-01-18 Method of stimulating plants
US1965551A (en) * 1931-07-06 1934-07-03 Bbc Brown Boveri & Cie Electric circuit breaker
US2069222A (en) * 1934-03-19 1937-02-02 Robert M Cremer Signal
US2111168A (en) * 1935-03-04 1938-03-15 Chansor John Flexible corrugated diaphragm
US2279536A (en) * 1938-05-27 1942-04-14 Bbc Brown Boveri & Cie Electric circuit breaker
US2260188A (en) * 1940-03-27 1941-10-21 Milliken Humphreys Gas-blast circuit breaker
US2293319A (en) * 1940-05-06 1942-08-18 Bbc Brown Boveri & Cie Electrical circuit interrupter
US2336316A (en) * 1940-06-08 1943-12-07 Bbc Brown Boveri & Cie High voltage electric circuit breaker
US2365131A (en) * 1940-06-17 1944-12-12 Reyrolle A & Co Ltd Alternating current electric circuit breaker of the gas-blast type
US2394046A (en) * 1942-12-10 1946-02-05 Westinghouse Electric Corp Circuit interrupter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10276318B1 (en) 2013-03-15 2019-04-30 Innovative Switchgear IP, LLC Insulated switch
US10290437B1 (en) 2013-03-15 2019-05-14 Innovative Switchgear IP, LLC Interrupter spring guide assembly
US10290436B1 (en) 2013-03-15 2019-05-14 Innovative Switchgear IP, LLC Insulated interrupter
US10319538B1 (en) 2013-03-15 2019-06-11 Innovative Switchgear IP, LLC Interrupter having unitary external terminal and internal contact
US10978256B1 (en) 2013-03-15 2021-04-13 Innovative Switchgear IP, LLC Electrical switching device

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Publication number Publication date
BE480095A (de)
FR960347A (de) 1950-04-15
GB620941A (en) 1949-04-01
CH272397A (fr) 1950-12-15

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