US2632075A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2632075A
US2632075A US720166A US72016647A US2632075A US 2632075 A US2632075 A US 2632075A US 720166 A US720166 A US 720166A US 72016647 A US72016647 A US 72016647A US 2632075 A US2632075 A US 2632075A
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United States
Prior art keywords
arc
core
plates
interrupting
pole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US720166A
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English (en)
Inventor
Herbert L Rawlins
Robert C Dickinson
Russell E Frink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE479338D priority Critical patent/BE479338A/xx
Priority to FR959368D priority patent/FR959368A/fr
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US720166A priority patent/US2632075A/en
Priority to GB34568/47A priority patent/GB630838A/en
Priority to CH273218D priority patent/CH273218A/fr
Application granted granted Critical
Publication of US2632075A publication Critical patent/US2632075A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • This invention relates to circuit interrupters in general, and more particularly to arc extinguishing structures therefor.
  • a general object of our invention is to provide an improved circuit interrupter particularly of. the air-break type, in which the structural positioning of the several parts and the arrangement thereof is such as to render greatly improved operating performance.
  • a more particular object of our invention is to provide improved means for causing a phase lag between the magnetic field and the are current to obtain an increase in interrupting ability at current zero.
  • Another object is to provide an improved transfer device to facilitate the transfer of one end of the are drawn by the contact structure to the arcing horn, to thereby bring about the insertion of the blowout coil into series circuit.
  • Another object is to provide improved plate construction for the circuit interrupter of the. type which establishes an arc and. moves thesame toward the closed ends of slots formed in. a plurality of spaced insulating plates.
  • Another object is to provide an improved magnetic structure to result in uniform magnetic blowout field throughout the entire length ofv the arc chute structure.
  • Another object is to provide improved means for disseminating the arc gases exhausting between the plate portions constituting the arc chute, to thereby prevent the possibility of flashover across the exhaust end of the arc chute.
  • Figure 1 is a side elevational view, partly in vertical section of an air-break type of circuit interrupter embodying our invention and shown in the closed circuit position;
  • Fig. 2 is a fragmentary vertical sectional view taken along the line 1III of Fig. 1, looking inthe direction of the arrows;
  • Fig. 3 is an enlarged fragmentary sectional view of the coil structure taken along the line.
  • Fig. 4 is an enlarged sectional view taken through the transfer interrupter device along the line IVIV of Fig. 1,, looking in the direction of the arrows;
  • Fig. 5 is an enlarged detail plan view of the transfer are horn taken on the line VV of Fig. 1.;
  • Figs. 6 through 8 are diagrammatic views illustrating the principles involved in our invention by causing a phase lag to exist between the mag.- netic field and the arc current, and
  • Fig. 9 is a detail side elevational view of one of the two shading coils employed in our invention.
  • the reference character I generally designates contact structure operable to draw an are which moves upwardly into an interrupting chamber generally designated. by the reference numeral 2.
  • the are is interrupted within the interrupting chamber 2 to thereby interrupt the circuit controlled by the breaker.
  • the contact structure I includes a terminal stud 3 surrounded by a flanged insulating. bushing 4, the latter extending through a support plate 5 and secured thereto.
  • a stationary main contact 6 At the right-hand end of the terminal stud 3 is secured a stationary main contact 6 having a pair of outwardly extending metallic support plates 1 secured thereto.
  • a rotatable contact arm 8 is piv-otally mounted at 9 between the support plates I, and is caused to move thereabout by the actuation of an insulating operating rod 12.
  • the operating rod I2 is actuated by suitable mechanism, not shown, but which is responsive either to. manual operation or to the existence of overload conditions existing in the circuit controlled by the interrupter.
  • the operating rod I2 is pivotally connected at l3 between a pair of support plates [4 rigidly secured to and rotatable with the contact arm 8.
  • a main contact bridge l5 formed of conducting material and electrically interconnecting the stationary main contact 6 with a second stationary main contact IT.
  • the contact I! is secured to the right-hand end of a second terminal stud I8, which insulating bushing 19.
  • the bushing I9 is secured to and supported by the framework or supporting plate structure 5.
  • apiston cylinder 20 Movablewith the rotatable contact arm 8 is apiston cylinder 20 within which moves a piston, not shown, secured to a piston rod 2
  • the second stationary main contact structure H Also supported by the second stationary main contact structure H are a pair of relatively stationary secondary and arcing contacts respectively designated by the reference characters 24, 25.
  • the secondary contact 24 cooperates with a movable secondary contact 25 carried by the contact arm 8.
  • the construction is such that the movable secondary contact 25 separates from the relatively stationary secondary contact 24 after disengagement of the contact bridge 15 from the stationary main contacts 5, ll.
  • the secondary contacts 24, 26 separate prior to the separation of the arcing contacts 25, 27:.
  • the are which is finally drawn by operation of the contact structure I is drawn between the arcing contacts 25, 2?.
  • suitable coil structure 33 including a, pair of parallel disposed blowout coils 34 more particularly shown in Figs. 1 and 3.
  • One end of the coils 34 is connected to the socket stationary contact 35.
  • the other ends of the coils 34 are connected to the stationary main contact structure I1 by the strap connection 34a.
  • each pole shoe 35, 31 has depending downwardly therefrom and secured thereto, such as by welding, a sub-pole piece 4! or 42.
  • ence numeral 44 is moved toward the left into the transfer interrupting stack generally designated by the reference numeral 41, the construction of which is more clearly shown in Figs. 1, 4 and 5.
  • the transfer interrupting stack 41 includes a plurality of spaced slotted ceramic plates 48 having slots 49 provided therein.
  • the closed ends of the slots 49 are slightly unsymmetrical about the center line 53 of the plates 48 so that the alternate positioning of the plates 48 will cause a zig-zag arc passage 5! to be formed
  • the off-setting of the closed ends of the slots 48 to about the center line 58 causes an elongation of the arc portion 44, as it is moved toward the left into the transfer interrupting stack 41.
  • the transfer are horn 54 is of metallic material, preferably copper and is secured by two screws of copper passing through countersunk apertures 55 provided in the arc horn 54 to terminate in the upper end of the stationary main contact plate 55 (Fig. 1).
  • a plurality of plates formed of magnetic material such as steel there are four such magnetic plates, two of which are designated by the reference character 59 and two of which are designated by the reference character 65.
  • the presence of the four plates 59, 50 of magnetic material disposed immediately below the transfer arc horn 54 facilitates the leftward movement of the lower end of the arc from the stationary arcing contact 25 to the are horn 54 to facilitate the entering motion of the arc portion 44 of the are 32 into the transfer interrupting device 47.
  • the paralleled dis:- posed blowout coils 34 are inseries circuit; and energize the transverse magnetic field extending across the interrupting chamber. 2 through. the pole shoes 33, 3?.
  • The. right-hand end ofvv the are 32 soon transfers to the right-hand arc horn or are terminal member 92 which is connected by a conducting strap 63 to the lower terminal stud 3 of the interrupter.
  • the reference character 38 indicates the position of the arc extending between the arc horns 39, 62 after the. blowout coils 34 are in series circuit.
  • the arc 33 is moved upwardly within the arc chute 39, which as mentioned previously, includes a plurality of spaced insulating ceramic plates or plate portions 49.
  • Fig. 2 more clearly shows the configuration of the plates 40.
  • each plate or plate portion 40 has a slot 64 provided therein, the upper closed end of which is slightly unsymmetrical about the center line- 65 of the plate 49.
  • the alternate positioning of the plates 48 about the center line 65 of said plates produces a zig-zag arc passage 66 at the upper closed ends of the staggered slots 64.
  • interruption depends on the rate of deionization at current zero, andif a higher rate could be maintained at this instant the interrupting capacity will be increased. If the magnetic flux is made to lag the arc current by a small angle, the flux will have an appreciable magnitude. at current zero, and at the instant just. preceding it. We have discovered that. this lag: should be' approximately 10; and that when. this. lag' is introduced, a.considerable .increase in. the. interrupting ability is effected. Although. we. have found 10 to be the most. effective, a. considerable range in. the angle of. lag will still.
  • the magnet. iron which we employ consists of a U-shaped structure composed of the magnet shoes 36,. 3'! and the magnet yoke 43 or core.
  • the magnet shoes for the voltage. considered are 9 /2 inches high, 1% inches wide, and of suflicient length to extend from the. magnet yoke or core 43, to approximately flush with the front.
  • the laminations. forming. the-pole shoes 36, 31 areof medium silicon steel 0.018 inch thick. Insulating tubes 72 are placed around the rivets 13 which hold the magnet shoes 36, 31 together, and insulating washers placed under the rivet heads to keep losses to a minimum in the shoes 36, 31.
  • the magnet yoke 43 or core is made of a similar grade of silicon steel and the laminations are placed at right angles to the laminations in the shoes 36, 31.
  • the core 43 has a length in the direction extending away from the arc-establishing means 25, 2! (that is, the vertical direction in Fig. 1) substantially the same as the length of the pole shoes 36, 31 in said direction.
  • the rivets M in the core 43 are not insulated.
  • the width of. the core. 43' or yoke is 1 inches as compared to the 1% inch dimension in the magnet shoes 36, 31.
  • As the core or yoke 43. must carry all the flux which is carried by the shoes 36', 3'!- the dimensional relation between the two forms a bottleneck in the magnetic circuit-and prevents extreme unbalance in the magnetic; field due to high saturation of the shoes- 36, 31 in the region adjacent to the yoke 43.
  • the magnetomotive force which produces the magnetic field in the interrupting space between pole pieces 353i is derived from the blowout coils 34.
  • the magnetomotive force around any closed loop including the magnet core 43 is equal to the magnetomotive force in these coils.
  • the closed loops comprising the core 43, the pole pieces 36-3! and the interrupting space there is a magnetomotive force drop in each part of each of the components which is equal to the fiux density at the point considered times the reluctance at that point times the differential length of path dl.
  • the flux density in any part of the interrupting space is proportional to the magnetomotive force across that space which is equal to the MMF of the coil minus the MMF drop in the core minus the MMF drop in the sections of the pole pieces between the core and the point under consideration.
  • the fiux density in the pole pieces is highest in the regions adjacent to the core and decreases progressively from left to right since any vertical section through the pole pieces on a plane perpendicular to the paper will intersect all the flux to the right of the section.
  • the core will saturate and its increased reluctance will limit the flux and prevent undue saturation of the pole pieces, and the result is a uniform field over the entire interrupting space.
  • the cross section of the core is 1%; x 9 /2 inches and the cross-section of the pole pieces is 1% X 9 inches. It has been found that these proportions make it possible to use enough turns in the coil 34 to provide fields strong enough to accomplish positive and speedy interruption of low and medium current arcs and still keep the field satisfactorily uniform over the interrupting space at the very highest currents.
  • the cross-sectional area of the core 43 less than the cross-sectional area of the pole shoes 36, 31; and our preferred range for the cross-sectional area of the core 43 is between 60% and 85% of the cross-sectional area of the pole shoes 35, 31.
  • the best value for the cross-sectional area of the core 43 is 80% of the cross-sectional area of the pole shoes 36, 37.
  • Fig. 6 diagrammatically indicates the magnetic circuit comprising the pole shoes 36, 31, the core 43 with the two shading coils 1
  • I1 be the current in the arc and blowout coil. Let on be the magnetic flux produced by I1.
  • E2 be the voltage induced in the shading coil H by 931.
  • I2 be the current in the shading coil H assuming resistance only.
  • p2 equal the magnetic flux produced by I2, then referring to Fig. '7 it Will be observed that qua: is the fiux in the interrupting space equal to the vector sum of q l+q 2.
  • y is the field strength at current zero.
  • a is the angle of lag between the phase of the field and are current.
  • a magnet structure including a core and a pair of pole shoes, means for establishing an are, means including the magnet structure to effect extinction of the are by moving the are within the transverse field extending between the pole shoes, and the crosssectional area of the core being less than the cross-sectional area of the pole shoes so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoes to thereby result in a more uniform field over the interruptin space.
  • a magnet structure including a core and at least one pole shoe, means for establishing an are, means including the magnet structure to effect extinction of the arc, and the cross-sectional area of the core being less than the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoe to thereby result in a uniform field over the interrupting space.
  • a magnet structure including a core and at least one pole shoe, means for establishing an are, means including the magnet structure to eifect extinction of the arc, and the cross-sectional area of the core being within the range between 60% and 85% of the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic fiux and prevent undue saturation of the pole shoe to thereby result in a more uniform field over the interrupting space.
  • a magnet structure including a core and at least one pole shoe, means for establishing an arc, means including the magnet structure to efiect extinction of the arc, and the cross-sectional area of the core being substantially of the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoe to thereby result in a more uniform field over the interrupting space.
  • means for establishing an arc means including a magnet blowout structure for causing interruption of the arc, the blowout structure including only a single core, an energizing winding for the core, and
  • a short circuited winding forming a shading coil disposed only about and completely encircling the core to effect thereby a phase lag between the magnetic field and the arc current.
  • an arc chute including a plurality of spaced slotted plates of insulating material, means for establishing an arc and moving it within the slots of the plates to effect the extinction thereof, a magnet structure including a single core and at least one pole shoe to effect movement of the are within the. arc chute, an energizing winding for the core and a short circuited shading coil completely encircling the single core to effect a phase lag between the magnetic field and the arc current.
  • terminals of opposite polarity means for establishing an are, an arc chute including a plurality of relatively ciosely spaced plates the major portion of which are of insulating material, the exhaust ends of all of the plates bein composed of insulating material, the plates being disposed substantially parallel to each other and positioned substantially transversely of the established arc, arc terminal members adjacent the ends of the arc chute and electrically connected at least durin arc extinction to the terminals of opposite polarity, means for moving the established are against the edges of the plates to effect the extinction thereof with exhaust arc gases passing outwardly between the plates, at least one of the end plates being appreciably shorter at the exhaust end thereof than most of the other plates to divert the exhaust arc gases in a different direction than that taken by the arc gases between most of the other plates to minimize the possibility of fiashover across the exhaust end of the arc chute, and said one end plate terminating at an insulating portion of the immediately adjacent longer plate.
  • terminals of opposite polarity terminals of opposite polarity, means for establishing an arc, an arc chute including a plurality of relatively closely spaced slotted plates the major portion of which are of insulating materail, the exhaust ends of all of the plates being composed of insulating material, the plates being disposed substantially parallel to each other and positioned substantially transversely of the established arc, arc terminal members adjacent the ends of the arc chute and electrically connected at least during arc extinction to the terminals of opposite polarity, means for moving the established arc within the slots of the plates to eiTect the extinction thereof with exhaust arc gases passing outwardly between the plates, at least one of the end plates being appreciably shorter at the exhaust end thereof than most of the other plates to divert the exhaust arc gases in a different direction than that taken by the arc gases between most of the other plates to minimize the possibility of flashover across the exhaust end of the arc chute, and said one end plate terminating at an insulating portion of the immediately adjacent longer plate
  • an arc chute including a plurality of relatively closely spaced slotted plates the major portion of which are of insulating material, the exhaust ends of all of the plates being composed of insulating material, the plates being disposed substantially parallel to each other and positioned substantially transversely of the established arc, means for moving the established are within the slots of the plates to effect the extinction thereof with exhaust arc gases passing outwardly between the plates, at least the end plates of the arc chute being appreciably shorter at the exhaust end thereof than most of the other plates to divert the exhaust arc gases in a different direction than that taken by the arc gases between most of the other plates to minimize the possibility of fiashover across the exhaust end of the arc chute, and said end plates terminating at an insulating portion of the immediately adjacent longer plates.
  • a magnet structure including a core and a pair of cooperating pole shoes, means for establishing an are between the pole shoes to be acted upon by the magnetic field set up therebetween, means including the magnet structure to effect extinction of the arc, the cross-sectional area of the core being less than the cross-sectional area of the pole shoes, and the length of the core in the direction extending away from said arc-establishing means being substantially the same as the length of the pole shoes in said direction.
  • a magnet structure including a core and at least one pole shoe, means for establishing an arc, means including the magnet structure to eifect extinction of the arc, the cross-sectional area of the core being less than the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoe to thereby result in a uniform field over the interrupting space, and the len th of the core extending away from said arc-establishing means being substantially the same as the length of the pole shoe in said direction.
  • a magnet structure including a core and at least one pole shoe, means for establishing an arc, means including the magnet structure to effect extinction of the arc, the cross-sectional area of the core being within the range between 60% and 85% of the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoe to thereby resuit in a more uniform field over the interrupting space, and the length of the core in the direction extending away from said arc-establishing means being substantially the same as the length of the pole shoe in said direction.
  • a magnet structure includin "a core and at least one pole shoe, means for establishing an are, means including the magnet structure to effect extinction of the arc, the cross-sectional area of the core being substantially of the cross-sectional area of the pole shoe so that the increased reluctance of the core will limit the magnetic flux and prevent undue saturation of the pole shoe to thereby result in a more uniform field over the interrupting space, and the length of the core in the direction extending away from said arc-establishing means being substantially the same as the length of the pole shoe in said direction.
  • a circuit interrupter of the air-break type including means for establishing an arc, an arc chute including a plurality of relatively closelyspaced plate portions the major portion of which are of insulating material, the exhaust ends of all of the plate portions being composed of insulating material, the plate portions being disposed substantially parallel to each other and .effect the extinction thereof with exhaust arc gases passing outwardly between the plate portions, at least one of the end plate portions being appreciably shorter at the exhaust end thereof than most of the other plate portions by an amount at least several times the spacing between the. plate portions to divert the exhaust arc gases in a different direction than that taken by the arc gases between most of the other plate portions to minimize the possibility of flashover across the exhaust end of the nating at an insulating portion of the immediately adjacent longer plate portion.
  • a circuit interrupter of the air-break type including means for establishing an arc, an arc chute including a plurality of relatively closelyspaced plate portions the major portion of which are of insulating material, the exhaust ends of all of the plate portions being composed of insulating material, the plate portions being disposed substantially parallel to each other and positioned substantially transversely of the established arc, means for moving the established are against the edges of the plate portions to arc chute, and said one end plate portion termi- 12 the other plate portions to minimize the possibility of flashover across the exhaust end of the arc chute, and said end plate portions terminating at an insulating portion of the immediately adjacent longer plate portions.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US720166A 1947-01-04 1947-01-04 Circuit interrupter Expired - Lifetime US2632075A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE479338D BE479338A (fr) 1947-01-04
FR959368D FR959368A (fr) 1947-01-04
US720166A US2632075A (en) 1947-01-04 1947-01-04 Circuit interrupter
GB34568/47A GB630838A (en) 1947-01-04 1947-12-30 Improvements in or relating to electric circuit interrupters having arc extinguishing means
CH273218D CH273218A (fr) 1947-01-04 1947-12-30 Interrupteur électrique.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US720166A US2632075A (en) 1947-01-04 1947-01-04 Circuit interrupter

Publications (1)

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US2632075A true US2632075A (en) 1953-03-17

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US720166A Expired - Lifetime US2632075A (en) 1947-01-04 1947-01-04 Circuit interrupter

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US (1) US2632075A (fr)
BE (1) BE479338A (fr)
CH (1) CH273218A (fr)
FR (1) FR959368A (fr)
GB (1) GB630838A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024331A (en) * 1957-11-06 1962-03-06 Westinghouse Electric Corp Circuit interrupter
US3050602A (en) * 1960-03-07 1962-08-21 Gen Electric Circuit interrupter
US3070681A (en) * 1958-10-29 1962-12-25 Ite Circuit Breaker Ltd Face wound blowout coil
US3081389A (en) * 1960-12-19 1963-03-12 Ite Circuit Breaker Ltd Uninterrupted arc chute venteng path for jump gap and runner
US3183409A (en) * 1960-11-17 1965-05-11 Cutler Hammer Inc Electromagnetic contactor

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US428650A (en) * 1890-05-27 Alternating-current magnetic device
US463762A (en) * 1891-11-24 Electric-arc interrupter
US938740A (en) * 1908-05-23 1909-11-02 American Electric Telephone Co Electromagnetic device.
US1164257A (en) * 1912-12-26 1915-12-14 Gen Electric Circuit-interrupting device.
US1681473A (en) * 1920-09-07 1928-08-21 Automatic Electric Inc Electromagnetic relay
US1851238A (en) * 1928-05-10 1932-03-29 Branchu Paul Joseph Electric arc disrupter
DE556524C (de) * 1932-08-10 Siemens Schuckertwerke Akt Ges Verfahren zum raschen Abschalten von Wechselstrom
US1872387A (en) * 1929-09-11 1932-08-16 Westinghouse Electric & Mfg Co Circuit breaker
US1879958A (en) * 1929-06-29 1932-09-27 Condit Electrical Mfg Corp Circuit interrupter
US1904463A (en) * 1929-11-27 1933-04-18 Gen Electric Circuit interrupting apparatus
US1922060A (en) * 1931-01-15 1933-08-15 Sachs Joseph Arc extinguishing device for electric switches
US1963643A (en) * 1933-02-23 1934-06-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2242905A (en) * 1939-01-04 1941-05-20 Westinghouse Electric & Mfg Co Circuit interrupter
US2276859A (en) * 1940-10-29 1942-03-17 Westinghouse Electric & Mfg Co Circuit interrupter
US2290708A (en) * 1940-07-16 1942-07-21 Gen Electric Gas blast circuit breaker
US2372045A (en) * 1942-08-26 1945-03-20 Westinghouse Electric & Mfg Co Switch
US2417683A (en) * 1944-04-13 1947-03-18 Gen Electric Electric air circuit breaker
US2468422A (en) * 1945-06-20 1949-04-26 Ite Circuit Breaker Ltd Arc chute

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US428650A (en) * 1890-05-27 Alternating-current magnetic device
US463762A (en) * 1891-11-24 Electric-arc interrupter
DE556524C (de) * 1932-08-10 Siemens Schuckertwerke Akt Ges Verfahren zum raschen Abschalten von Wechselstrom
US938740A (en) * 1908-05-23 1909-11-02 American Electric Telephone Co Electromagnetic device.
US1164257A (en) * 1912-12-26 1915-12-14 Gen Electric Circuit-interrupting device.
US1681473A (en) * 1920-09-07 1928-08-21 Automatic Electric Inc Electromagnetic relay
US1851238A (en) * 1928-05-10 1932-03-29 Branchu Paul Joseph Electric arc disrupter
US1879958A (en) * 1929-06-29 1932-09-27 Condit Electrical Mfg Corp Circuit interrupter
US1872387A (en) * 1929-09-11 1932-08-16 Westinghouse Electric & Mfg Co Circuit breaker
US1904463A (en) * 1929-11-27 1933-04-18 Gen Electric Circuit interrupting apparatus
US1922060A (en) * 1931-01-15 1933-08-15 Sachs Joseph Arc extinguishing device for electric switches
US1963643A (en) * 1933-02-23 1934-06-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2242905A (en) * 1939-01-04 1941-05-20 Westinghouse Electric & Mfg Co Circuit interrupter
US2290708A (en) * 1940-07-16 1942-07-21 Gen Electric Gas blast circuit breaker
US2276859A (en) * 1940-10-29 1942-03-17 Westinghouse Electric & Mfg Co Circuit interrupter
US2372045A (en) * 1942-08-26 1945-03-20 Westinghouse Electric & Mfg Co Switch
US2417683A (en) * 1944-04-13 1947-03-18 Gen Electric Electric air circuit breaker
US2468422A (en) * 1945-06-20 1949-04-26 Ite Circuit Breaker Ltd Arc chute

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024331A (en) * 1957-11-06 1962-03-06 Westinghouse Electric Corp Circuit interrupter
US3070681A (en) * 1958-10-29 1962-12-25 Ite Circuit Breaker Ltd Face wound blowout coil
US3050602A (en) * 1960-03-07 1962-08-21 Gen Electric Circuit interrupter
US3183409A (en) * 1960-11-17 1965-05-11 Cutler Hammer Inc Electromagnetic contactor
US3081389A (en) * 1960-12-19 1963-03-12 Ite Circuit Breaker Ltd Uninterrupted arc chute venteng path for jump gap and runner

Also Published As

Publication number Publication date
BE479338A (fr)
FR959368A (fr) 1950-03-29
CH273218A (fr) 1951-01-31
GB630838A (en) 1949-10-21

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