US2061301A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2061301A
US2061301A US618455A US61345532A US2061301A US 2061301 A US2061301 A US 2061301A US 618455 A US618455 A US 618455A US 61345532 A US61345532 A US 61345532A US 2061301 A US2061301 A US 2061301A
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United States
Prior art keywords
arc
chamber
liquid
arc extinguishing
circuit
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Expired - Lifetime
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US618455A
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English (en)
Inventor
Duffing Paul
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CBS Corp
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Westinghouse Electric and Manufacturing Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"

Definitions

  • One object of my invention is toy provide an expansion type circuit interrupter in -which the expansion chamber is normally free of the ⁇ arc 1,5 extinguishing liquid, and whichyzhas means associated therewith for injecting fa predetermined quantity of this liquid into the' chamber during each operation of the interrupter.
  • Another object of my invention is, to provide an expansion chamber for -an arc extinguishing device which shall have a piston associated there- D with for moving a predetermined amount of liquid into the'arc extinguishing chamberduring' each" Moperation of the breaker.
  • Another object oimy invention is to provide means whereby the volume of the arc extinguishing chamber of a circuit breaker arc extinguish-- ing device may be decreased during the separation of the breaker contacts.
  • Another object of my invention is to provide an improved type of expansion chamber vfor circuit breaker arc extinguishing devices which shall be economical to manufacture and shall be lmore eiective than previous structures of thistype.
  • 'Another object of my invention is to provide an expansion chamber for an ⁇ arc extinguishing device which shall comprise a plurality of separable plates having centrally disposed openings through which the moving contact of the breaker 40 moves, these openings aligningM to form the expansion chamber.
  • a further object of my invention isV to provide a circuit breaker having separable contacts and an arc extinguishing device with a hollow insu- 45r lator for providing an enclosed passageway within which one of the separable contacts may be moved out of engagement with the arc extinguishing. device, thus making possible the complete enclosing of all the movable parts of the circuit 50 ⁇ breaker.
  • a still further object of my invention4 is to provide a circuit interrupter having separable contacts and an arc extinguishing device with a transparent insulator for providing an enclosedv 55 path through which one of the separable contacts moves, the transparent insulator making it possible to determine the position of the contacts visually.
  • I provide a pair of separable contact members for opening the circuit, an arc extinguishing device associated therewith, an operating means for separatingthe contact members, and a supporting means for mounting the entire structure in an operative position.
  • I provide a transparent insulator, having a passage therethrough, disposed adjacent to the arc extinguishing device, the passage aligningwith the arc extinguishing device in such manner that it provides a closed passageway wherein one of the separable contacts moves.'V
  • Thev operation ⁇ of my invention depends upon the combination of several known scientific facts: First, itv is well known that a current carrying arc is made up of a large number of electrons and ions, that is, the arc path is in an ionized state. Second, it is well known. that the extinguishing of an alternating currentarc may be most eiiectively accomplished at the time of current .z'ero, because it is only at the time of current zero that new electrons are not being forced into. the arc path by the current flow.
  • This combination of an electron with aneutral molecule (or atom) is most effective in preventing the reionization of the'arc path because the acceleration which may be given to the electronmolecule or to the electron-atom combination is very small as compared with the acceleration which may be given to a single electron-it being possible for the mass of the combination to be as much as 30,000 times that of the electron alone.
  • breaker must be vaporizable rather than of a type which breaks down, irreversibly, into less complex components upon the application of heat.
  • Als o it is necessary that the fluid used in this type' of breaker be capable of existing in the vapor state at ordinary atmospheric pressures.
  • One of the most satisfactory fluids found so far is pure water, or water having glycerine, alcohol, or some salt added thereto for the purpose of preventing freezing.
  • the operation of a circuit breaker of this type is as follows:
  • the arc is established within a substantially closed chamber having a means associated therewith for releasing the pressure of the gas formed by the arc at some predetermined point.
  • the release pressure when using watefas the arc extinguishing fluid, is usually less than 30 atmospheres.
  • Thewater, or other liqwhich is vaporized by the arc passes almost gaseous state as a result of the high temperature.
  • the pressure within the chamber builds up very rapidly--usually within an alternation or two-and then the pressure releasing means is operated.
  • the pressure releasing means is so constructed that the iiuid is held in the vapor state for a period greater than one alternationthis being necessary to assure the presence of vapor adjacent the arc path during at least one current zero.
  • the portion of ionized gas which ⁇ was, prior to current zero, the arc path is thus As the current passes through the zero point and 20 as the voltage increases further, the number of free electrons has been reduced to such a small value that it is no longer possible to reignite the arc by the ionization resulting from the collision of the electrons and the free molecules in the space between the two terminals.
  • Figure 1 is a side elevational view showing a circuit breaker equipped with the arc extinguishy ing device of my invention
  • Fig. 2 is a front elevational view of the circuit breaker shown in Figure 1
  • Fig. 3 is a fragmentary sectional view, partially in elevation, through the arc extinguisher shown in Fig. l, a
  • Fig. 4 is a sectional view. similar to Fig. 3, showing a modified type of arc extinguisher, and
  • Fig. 5 is a sectional view through the arc extinguishing device shown in Fig. 3 on the line V-V.
  • the arc extinguishing device I is mounted on two upright insulators 3 which, in turn, are ai'iixed to a base 5. Projecting upwardly from the base 5 are two arms 1 which support an enclosure 9 containing the mechanism for operating the separable contacts.
  • a transparent insulator II having a passageway I2 therein extends upwardly from the arc extinguishing device I and engages the breaker operating mechanism enclosure 9. This transparent insulator Il provides an enclosed passageway wherein the movable contact member I3 moves after that member leaves the arc passage. Terminal contacts I4 and I5 are provided for connecting the interrupter in the external circuit.
  • the operating mechanism 9 is not a feature of my inventian, and since these mechanisms are well known in the art, it will be necessary for a full understanding of my invention to merely mention that the moving contact I3 is moved,4 thereby, into and out of engagement with the other contact member which is disposed in the base of the arc extinguisher I.
  • the breaker shown in Figs. 1 and 2 is in the open position and it will 'be noted that a portion of the moving contact I3 aceaeoi i'ixed to the base I5 and comprises, in general, v
  • a guide member 3l having a funnel shaped opening 33 therein is disposed in the upper portion of the cylindrical member 23, being affixed thereto by the spokelike supports 34; this member 3l assists in guiding the end 29 of the contact member i3 when that member is moving to the open or to the closed position.
  • the top of the cylindrical member 23 is closed by the bottle shaped flange 35 having a cylindrical opening 31 therein.
  • plurality of circular plates of insulating material 39 are positioned above the cylindrical base 23.
  • Each of the plates 39 has four other openings 45, therein, through which the guide pins 41, of insulating material, are placed; the upper end of the pins l1 being aixed to the casing I9.
  • the openings 4I and 45 align upon the assembly of the individual plates, and combine to form, respectively, a centrally disposed passage through which the contact member I3 moves to establish the arc, and openings for assembling and guiding the individual -plates I39.
  • each of the plates 39 aligns with the corresponding cut-out portion 43 of the adjoining plate to form an annular recess connecting with the through passage or chamber formed by the openings 4I.
  • 'I'hese annular recesses and the through passage comprise the upper portion of the arc extinguishing chamber proper, and it is within this portion of the chamber that the arc extinguishing uid is rst gasiiied under pressure and then changed to the vapor state by releasing the pressure.
  • 'I'he base member 49 of the assemblyof plates 39 has a sleeve portion 5I which slidably engages the opening 31 inthe top iiange 35.
  • the base plate 49 is biased upwardly by the springs53 and provides a releasable means for holding the insulating plates 39 inv contact with each other.-
  • the passageway i2 While it connects with the arc passage, is not used for aiding in arc extinction and. the arc is never drawn thereinto. Rather, the function f this passage is to make possible the complete enclosing of the moving parts of the breaker and to permit the circuit position of the breaker to be determined by visual inspection.
  • An opening 54 having a gland 55 and packing 51 therein is .disposed in the top portion of the insulating casing I9 and provides a means for engaging the sides of the contact member i3 and thereby effectively sealing the arc extinguishing chamber.
  • the gland and packing also prevent the arc extinguishing fluid from being forced into the passageway I2.
  • ,Other openings 59 are provided in the casing member I9 for preventing the building up of dangerous press'ures within the casing itself'during the operation of the interrupter. 1
  • the insulating means II is preferably constructed of glass andas previously mentioned,
  • the base member 53 of the insulating means Ill may be of metal, as shown, and is aiiixed to the top of the casing i9 by means of the screws 55 which engage suitable threaded openings there-
  • the stationary contact assemblage 2i is designed for a triple purpose; it provides a means for contacting the movable contact member i3 and, at the same time, it provides a means for moving a predetermined quantity of the arc extinguishing fluid into the arc extinguishing chamber proper during each operation of the interrupter;A in addition, it reduces the volume of xthe chamber.
  • the bottom of the cylindrical member 23 is provided with an opening 61 to permit the passage of thefarc extinguishing liquid il therethrough.
  • a flap valve 69 which opens inwardly into the cylindrical member 23 is provided for closing the opening 51.
  • the piston 25 is biased upwardly by the springs 1i and has two openings 13 therein, each of which isI closed by a ap valve 15. The electrical circuit is maintained through the springs 1I which connect the piston 25 with the base i5.
  • the interruptor is shown in Fig. 3 in the closed position.
  • the operating mechanism 9 moves the contact member i3 upwardly.
  • the piston 25 follows this movement until the portion 21 abuts against the bottom of the guide member 3i.
  • the insulating discs 39 are normally out of ⁇ contact with the arc extinguishing liquid l1 which lls only the base I5 of the arc extinguishing chamber, and the piston 25 isolates that portion of the arc extinguishing liquid above the piston from the main body of liquid.
  • the flap valve 69 lifts and permits the in-iiow of the arc extinguishing liquid
  • the end 29 of the contact member I3 moves downwardly through the arc extinguishing chamber, the opening 33 in the guide member 3
  • the valve 69 closes, if not already closed, and the valves 15 open, thereby permitting the passage of a predetermined quantity of liquid into the space above the piston. The entire structure is then returned to the position shown in Fig. 3.
  • Both of the flap valves 15 and the valve B9 are biased to the closed position by suitable means (not shownf).
  • suitable means not shownf.
  • FIG. 4 A modified form of the arc extinguishing device of my invention is shown in Fig. 4.
  • the metallic base 11 of the cylindrical casing is aiiixed to the upper portion 19, which is of insulating material, by means of the bolts 8
  • a plate member 91 is disposed between th'e faced surfaces 83 and 85 and provides a supporting means for the arc extinguishing structure proper.
  • This structure includes a flat plate of insulating material 89 which is rigidly aliixed to the base plate 81 and has openings 9
  • a cylindrical member of insulating material 93 is affixed to the insulating plate 89 and has openings 95 therein to permit the passage of the arc extinguishing fluid 91, which partially fills the casing.
  • a piston 99 which is biased upwardly by a spring and has a contact member
  • Disposed above the cylindrical member 93 are a plurality of separable plates and 01. These plates are substantially circular in outline and have central openings '
  • An opening E23 is provided in the cylindrical member 93 which is of substantially the same size as the end
  • 25 are provided in the top portion 19 of the casing to prevent the building up of dangerous gas pressures.
  • 21 enters the arc extinguisher through an opening
  • this modified form of arc extinguisher is substantially the same as the operation of the extinguisher shown in Fig. 3.
  • the contacts are shown in the closed position in Fig. 4.
  • 03 and piston 99 which is aflixed thereto also moves upwardly.
  • the upward movement of the piston 99 decreases the volume of the arc extinguishing chamber and at the same time keeps that chamber filled with the arc extinguishing liquid.
  • 03 stops when the portion
  • the engaging contacts then separate and the arc is established therebetween.
  • This modification of my invention is particularly adapted for interrupting medium'current arcs; it being possible to reduce the amount of arc extinguishing liquid, within the chamber to a minimum.
  • the volume of the chamber is reduced but the effect is a reduction of the quantity of liquid which must be gasiiied by the arc.
  • This reduction in volume of the arc extinguishing iiuid is particularly desirable when interrupting the lower current arcs, because it assures the complete gasification of all of the liquid, and also assures a rapid production of sufcient gas pressure to operate the vapor producing means.
  • Threaded holes 35 are provided in casing 19 in order to mount an insulating means similar to the insulator 4
  • I have disclosed an arc extinguishing device which has means associated therewith for introducing a predetermined quantity of arc extinguishing fluid into the arc extinguisliing chamber during' each operation of the interrupter, and for reducing the volume of aocgneoi the chamber, to the point of maximum effectiveness, during each operation of the breaker.
  • a pair of relatively movable conducting members for opening the circuit
  • an arc extinguishing device comprising a chamber having an opening therein, one of said moving contact members moving through said opening out of said arc extinguishing device during the circuit opening operation, a hollow insulating means, at least partially of transparent material, for providing an enclosed passage, external to said chamber and within which said contact member moves during the final stages of the circuit opening operation, one end of said moving contact remaining within said hollow insulating means when said interrupter is inthe fully open position in order to permit visual determination of ⁇ the position of said interrupter and means for sealing said arc extinguishing chamber from saidenclosed passage at least during each arc extinguishing operation.
  • a circuit interrupter separable contact means one of which comprises a piston, for opening and closing the circula-land an arc extinguishing device cooperating ⁇ tl1erewith, said arc extinguishing' device including a body of liquid, a chamber open to said body of liquid when said contact members are in one position, andmeans coacting vithaid piston during the operation of said .interrupter to entrap a predetermined quantity of said liquid within said arc chamber and to closev said chamber to said bodyof liquid.
  • a circuit interrupter two relatively movable contact members for opening and closing' the circuit, and an arc extinguishing devicecooperating therewith, said arc extinguishing device including a body of liquid, an arc extinguishing chamber at least a portion of which is not iilled with said liquid when said interruptor is in the closed position, one of said contact mem- Vbers being movable from said liquid into said apprislled portion of said arc extinguishing chamber, and piston means, operable during the opening of said interrupterffor moving some of said liquid into said unlled portion oi said arc extinguishing mber.
  • separable contact means one of which comprises a piston, foropening andclosing the circuit, and an arc ex- Y ftjinguishing device including a casing, formed at lea'st-jparti'ally of insulating material andhaving 'a passage-extending therethrough, a body of l liquid 'contained-within said casing, said pas sage being normally only partially iilled with said liquid, and a means which coacts with said piston during the operation of said'interrupter to cause a predetermined quantity of said liquid to be moved into the normally unfilled portions of said passage and to close said passage to said body of liquid.
  • a circuit interrupter two relatively movable contactmembers for opening and closing the circuit, and an arc extinguishing device cooperating therewith, said arc extinguishing device including a casing, at least partly of insulating material, having an arc passage therein, a body of liquid contained in said casing, one portion of said passage being above the level of said liquid, said passage being open to said body of liquid when said interruptor is in the .closed position, and piston means for moving some of said liquid into said passage during the opening of said interrupter, one of said contact members moving through said passage during the opening of the interrupter to establish an arc therein, said casing having means, operable at a predetermined pressure, for releasing a portion of the gas formed within said passage during the extinguishing oi an arc.
  • openings aligning to form a substantiallyclosed chamber wherein the arc incident to the interruption of the circuit is established, and means for moving some of said liquid into said passageway.
  • a circuit interrupter relatively movable contact members for opening and closing the circuit, land an arc extinguishing device including a casing, a body of liquid contained therein, a plurality of separable platesipositioned above said body of liquid .and having openings therein, said openings aligning to form a substantially closed chamber wherein the arc incident to the interruption of the circuit is established, and a piston, movable in response to the movement of at least one of said separable contact members for moving some of said liquid into said chamber. during each operation of said interrupter.
  • a ⁇ circuit interrupter relatively movable contact members for opening and closing the circuit,J and an arc extinguishing device
  • a casing a body of liquid contained therein, a plurality of separable plates ofy insulating material positioned above said bodyl of liquid and having openings therein, means biasing said plates toward each other, said openings aligning to form a substantiallyzclosed chamber wherein thearc incident to the interruption ofthe circuit is established, and means 'for injecting some of said liquid into said chamber proximate said arc duringthe opening operation of said interrupter,
  • a circuit interrupter relatively movable contact members for opening and closing the circuit, and an arc extinguishing device including a casing, a body of liquid contained therein, a plurality of separable plates having centrally disposed openings therein, said openings aligning to form a substantially closed chamber wherein the arc incident to the interruption of the .circuit is established, one end of said chamber being open to said body of liquid when said interrupter is in the closed position, and means for closing saidchamber to said body of liquid during the opening of said interrupter.
  • a circuit interrupter relatively movable contact members for opening and closing the circuit; a body of arc extinguishing fluid; and an arc extinguishing device including a substantially closed pressure chamber wherein an arc is established by said relatively movable contact members, piston means movable within said chamber to cause a predetermined quantity of said arc extinguishing liquid to be entrapped therein during each operation of said interrupter, the walls of vat least a portion of said chamber being dened by a plurality of separable plates of insulating material movable in response to pressure within said chamber to establish vent openings therebetween, and means biasing said plates toward each other.
  • movable means having a portion for drawing an arc within one of said chambers, a body of arc extinguishing liquid within said one of said chambers for extinguishing the arc established therein by said arc drawing means, said movable means having a portion movable into said other chamber following the drawing and the extinguishing of the arc in said one of said chambers, said other of said chambers having walls at least partially of transparent insulating material, said movable means being visible through the transparent walls of said other chamber to permit visual determination of the condition of said interrupter, and means for sealing said chamber wherein the arc is extinguished from said other chamber at least during each arc extinguishing operation.
  • a circuit interrupter means, at least partially of insulating material, for defining a, tubular arc passage; means of conducting material for closing one end of said arc passage and for providing a terminal for said interrupter; a body of arc extinguishing liquid contained within said arc passage; arc drawing means for said interrupter, ⁇ including a contact movable through said arc passage; piston means movable to bring a quantity of arc extinguishing iiuid into more intimate contact with said arc, said piston means being actuated in response to movement of said movable contact; and means at least partially of transparent insulating material for defining a passageway which connects with said arc passage through a single opening, which opening is closed by said movable contact when said interrupter is in the closed circuit position and during each arc extinguishing operation; said arc drawing contact being moved into said passageway subsequent to the extinguishment of said arc in said arc passage and being visible through the transparent portion of said insulating means to
  • a circuit interrupter two relatively movable contact members, one of which comprises a mpvable piston member and the other of which is movable away from the piston member, a guide means for said piston member, a. body of liquid, and means for defining the walls of an arc passage, at least. a portion of which is positioned above the normal level of said body of liquid, said piston member being movable during the circuit opening operation to cause a quantity of said liquid to be moved into said portion of said arc passage which is positioned above the normal level of said body of liquid.
  • two movable contact members one of which comprises a movable piston means away from which the other contact is movable, a, body of arc extinguishing liquid, and an arc extinguishing device, including means for dening the walls of a substantially closed pressure chamber, wherein an arc is established by contact members during the circuit opening operation, and guide means for said piston means, said piston means being movable during each circuit opening operation, to cause a'predetermined quantity of said arc extinguishing liquid to be entrapped within said chamber.
  • two relatively movable contact members one oi' which comprises a movable piston means, a body ofrarc extinguishing liquid, and an arc extinguishing device, in-
  • cluding means for defining the walls of a substantially closed pressure chamber wherein an arc is established by said contact members during the circuit opening operation, at least a portion of said wall dening means comprising a pluralityof separable plates movable in response to pressure within said chamber to establish vent openings therebetween, means biasing said plates toward each other, and guide means for said piston means, said piston means being movable during each circuit opening operation to cause a predetermined quantity of said arc extinguishing liquid to be entrapped within said chamber.
  • a circuit interrupter two relatively movable contact members, and an arc extinguishing device cooperating therewith, said arc extinguishing device including a body of liquid, a. plurality of separable members for defining the walls of an arc passage which is open to said body of liquid ywhen said contact members are in one position and means operable during the circuit interrupting operation to close said arc passage to said body of liquid.
  • a circuit interrupter two relatively movable contact members, and an arc extinguishing device cooperating therewith, said arc extinguishing device comprising a body of liquid, a plurality of contiguous laminations for denning the walls of an arc passage which is open to said body of liquid when said contact members are in one position, and piston means operable during the circuit interrupting operation to close said arc passage to said ⁇ body of liquid.
  • ing device comprising a body of liquid, a pressure chamber, the walls of which are defined by a stack of separable, superposed plate members, at least a portion of said chamber being positioned above the normal level of said body of liquid and said contact members being adapted to establish the arc incident to the opening of said interrupter within said pressure chamber, and means operable during the circuit opening operation to cause some of said liquid to be moved into that portion of said chamber which is positioned above the normal level of said body of liquid.
  • a circuit interrupter two relatively movable contact membersand an arc extinguishing device cooperating therewith, said arc extinguishing device comprising a body of liquid, a pressure chamber, the walls of which are defined by a stack of s'uperposed plate members, said contact members being adapted to establish the arc incident to the openingA of said interrupter within said pressure chamber, and piston means operable during the circuit opening operation to cause a predetermined quantity of said liquid to be entrapped within said chamber.
  • a pressure chamber wherein ⁇ said contacts are adapted to separate, means disposed within said pressure chamber for generating an arc extinguishing gas when said arc is drawn therein, and means for permitting the escape ofA said gas from said pressure chamber when the pressure thereof reaches a predetermined value; said means for permitting a visual determination of the position ofsaid contacts including a second chamber which connects with said""pressure chamber to form a unitary closure, at least a portion of the walls of said second chamber being formed of transparent material, and means which seals said second chamber from said first chamber, at least during each arc extinguishing operation, in order to prevent said arc extinguishing gas or other arc products from entering said second chamber during the operation of said interrupter.
  • a completely enclosed circuit interrupter a stationary contact; a movable contact which comprises a rod member of conducting material for cooperating therewith; actuating means for moving said movable Contact into and out of engagement with said stationary contact; means for extinguishing the arc formed incident to the opening operation of said interrupter; and means for permitting a visual determination of the position of said movable contact at least when said interrupter is in the open circuit position;
  • said arc extinguishing means including a pressure chamber wherein said stationary contact is disposed and within which the arc incident to the separation of said contacts is drawn, means disposed within said pressure chamber for generating an arc extinguishing gas when said arc is drawn therein, and means -for permitting the escape oiv lsaid gas from said chamber when the pressure thereof reaches a predetermined value; said means for permitting a Visual determination of the position ofsaid contacts including a second chamber which connects with said rst chamber to form a unitary closure, at least a portion of the walls of said

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US618455A 1931-05-27 1932-05-25 Circuit interrupter Expired - Lifetime US2061301A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2061301X 1931-05-27
DE601266T 1931-06-20

Publications (1)

Publication Number Publication Date
US2061301A true US2061301A (en) 1936-11-17

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ID=34621131

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Application Number Title Priority Date Filing Date
US618455A Expired - Lifetime US2061301A (en) 1931-05-27 1932-05-25 Circuit interrupter

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US (1) US2061301A (fr)
BE (1) BE389180A (fr)
DE (1) DE601266C (fr)
FR (1) FR738560A (fr)
GB (1) GB386225A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420888A (en) * 1943-04-02 1947-05-20 Westinghouse Electric Corp Oil circuit interrupter
US2424343A (en) * 1943-05-27 1947-07-22 Westinghouse Electric Corp Circuit interrupter
US2612576A (en) * 1946-06-12 1952-09-30 Lange Emil Electric circuit breaker
US2622165A (en) * 1941-06-24 1952-12-16 Westinghouse Electric Corp Circuit interrupter
US2739207A (en) * 1951-09-28 1956-03-20 Westinghouse Electric Corp Circuit interrupters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622165A (en) * 1941-06-24 1952-12-16 Westinghouse Electric Corp Circuit interrupter
US2420888A (en) * 1943-04-02 1947-05-20 Westinghouse Electric Corp Oil circuit interrupter
US2424343A (en) * 1943-05-27 1947-07-22 Westinghouse Electric Corp Circuit interrupter
US2612576A (en) * 1946-06-12 1952-09-30 Lange Emil Electric circuit breaker
US2739207A (en) * 1951-09-28 1956-03-20 Westinghouse Electric Corp Circuit interrupters

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Publication number Publication date
GB386225A (en) 1933-01-12
BE389180A (fr)
DE601266C (de) 1934-08-11
FR738560A (fr) 1932-12-27

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