US2575730A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2575730A
US2575730A US734444A US73444447A US2575730A US 2575730 A US2575730 A US 2575730A US 734444 A US734444 A US 734444A US 73444447 A US73444447 A US 73444447A US 2575730 A US2575730 A US 2575730A
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US
United States
Prior art keywords
plates
arc
plate
slots
baille
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US734444A
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English (en)
Inventor
Sandin Jerome
Herbert L Rawlins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL77645D priority Critical patent/NL77645C/xx
Priority to FR964187D priority patent/FR964187A/fr
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US734444A priority patent/US2575730A/en
Priority to GB2692/48A priority patent/GB634490A/en
Application granted granted Critical
Publication of US2575730A publication Critical patent/US2575730A/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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/342—Venting arrangements for arc chutes

Definitions

  • This invention relates to circuit breakers in general, and more particularly to arc extinguishing structures therefor.
  • a general object of our invention is to provide an improved circuit breaker of simplified construction and relatively few parts which may be easily disassembled to inspect the several component parts thereof.
  • Another object is to provide an improved circuit interrupter of the foregoing type which will have an increased interrupting capacity as a result of improved cooling means for the arc gases which we provide with our invention.
  • Still a further object is to provide an improved circuit breaker in which improved interlocking means are provided between the several parts.
  • Another object is to provide an improved circuit breaker of the air-break type in Which an improved am construction is employed in conjunction with the spaced plate extinguishing structure to more effectively deionize the arc gases and prevent restriking across the edges of the plates than has been obtained heretofore.
  • Another object is to provide an improved housing for an arc extinguishing structure of the spaced plate type in which, by the provision of cooperating grooves on the interior walls thereof. improved means are provided for holding and positioning the spaced plates in proper place. In the same connection it is desired to facilitate manufacturing of the devices by the use of such improved housing construction.
  • Another object is to provide an improved plate construction for arc extinguishing structures of the spaced plate type to more effectively absorb the thermal energy of the arc gases to intensify the cooling thereof to thereby facilitate dielectric establishment andconsequent arc extinction.
  • vFig. 2 is a vertical sectional view taken along the line lI-II of Fig. 1, the contact structure being omitted for the purpose of clarity;
  • Fig. 3 is a vertical sectional view through the arc chute housing to show the improved slot construction provided to hold the several plates in spaced relationship;
  • Fig. 4 is a fragmentary, perspective view of a portion of the arc chute to more clearly indicate that the two sets of slots are in two different substantially parallel planes;
  • Fig. 5 is an end view of the antique member which appears looking toward the left in Fig. 1;
  • Fig. 6 is a side elevational view of the other end of the baille member, that is, looking toward the right in Fig. 1;
  • Figs. '7 to 14 inclusive are end and side elevational views of the several conducting platev members used in our improved arc extinguishing structure.
  • Our invention is particularly concerned, although not solely applicable to, arc extinguishing structures of the spaced conducting plate type, the theory and operation of which are set forth in U. S. Patent No. 1,932,690 which issued October 24, 1933, to Joseph Slepian, U. S. Patent No. 1,963,643 which issued June 19, 1934, to Maurice W. Brainard and Benjamin P. Baker and U. S. Patent No, 2,147,419 which issued February 14, 1939, to Benjamin P. Baker, all of the aforesaid patents being assigned to the assignee of the instant application. Since the theory and fundamental operation of the spaced plate type of arc extinguishing device are set forth in these three patents, it is consequently believed that a detailed picture of the theory of the operation is unnecessary for a full understanding of our invention.
  • the reference character I designates an insulating base plate upon which the several parts of the circuit breaker 2 may be mounted.
  • the circuit breaker 2 includes an arc extinguishing deviceV 3 and separable contact structure i operable to establish an arc.
  • the contact structure 4 includes a stationary contact 5 having an arc resisting tip portion 6 and an arcing horn 'l composed of magnetic material.
  • the stationary contact 5 is secured to the base plate I by a stud bolt S which passes through the plate I, and also secures xedly in place a terminal strap 9.
  • a movable arc resisting tip portion Iii secured to the movable contact II, the latter having a diagonally extending movable arc horn I2.
  • movable contact I I is secured by a pair of screwsv i3 to a movable contact arm I4, the latter being pivotally mounted by a pin I5 to a metallic frame I6.
  • the frame I6 is pivotally mounted at engagement in the closed circuit position of the circuit breaker, as shown in Fig. 1, by a compression spring I9, one end of which is seated in a recess formed in the base plate I.
  • the left hand end of the compression spring I9 engages the lower end 2I of the movable contact arm I4 as shown.
  • a conducting strap 22 is secured at one end to the contact arm I4 and the other or lower end 23 thereof preferably extends through an electro-responsive trip device not shown.
  • the circuit there--4 through includes terminal strap 9, stationary contact 5, movable contact Il, conducting movable contact arm I4, and through conducting strap 22 to the electroresponsive device, not shown.
  • the arc extinguishing structure 3l includes a plurality of spaced slotted magnetic plates 30., the configuration of which is Vmore clearly shown in Figs. 9 and 1-0.
  • Each steel plate 36' a slot or notch 3-Iv formed therein, extending upwardly from ⁇ 'the lower edge A32 of the plate, thus forming two downwardly extending legs 33.
  • the notchor Vslot 3I comes to an apex 34 adja- 4 cent ⁇ the upper 'end ef the plate 3i). Near the upper end of the plate are two recesses Y35, the 4functionof which will be more apparent hereinafter. Since the plates 38 are of ferrous material, in this instance steel, the magnetic reac tion between the arc 228 and themagneti'c plates 36'r is such as to attract or draw the a-rc 28 up- Wardly within the notch 3LI towards the ⁇ apex 34 thereof.
  • the spaced magnetic plates 30 constitute one type of conducting platel which. we employ ink our arc extinguishing device '3.
  • the other type is herein designated by the reference character 316 and is shown more clearly in Figs. V'7 vand 8.
  • the several conducting plates 36 are formed of a conducting material which .has a higher thermal conductivity than the .ferrous .plates 36.
  • each of the short copper plates has two 5 apertures 38 formed therein within two leg portions 39, the latter being bridged by a 'bight portion 48'.
  • the cooling and neutralizing of the ionized gas is considerably increased. It has been noted during tests that the several short arcs between the plates 3D impinge and travel a short distance on the copper plates 36, thereby being further subdivided. This means increased arc voltage due to the additional short arcs established between the copper plates 36. As a result of these advantages, there is less outward .disturbance in the form of flame and report than when only the steel plates 30 are used.
  • Figs. 2 to 4 inclusive we have provided two sets of interiorly disposed slots in different substantially parallel planes on the opposed side walls ft2 of the aro chute housing or casing 43.
  • the casing 43 is formed by a hot molding yprocess from a suitable molding material.
  • Fig. 4 more clearly shows that .the upper set of slots 44 extend Vto a depth which is deeper into the interior of the side walls 42 than the depth of the lower set of slots 45.
  • the plates 3U. having a more narrow width than the plates 35, freely slide between the ridges 46 of the slots 44'.
  • the short copper plates 36 are so wide as to be held .in position by the ridges et of the upper set of slots 44 so that the lower edges 49 of the plates 36 ⁇ come to rest at the lower ends 56 of the upper set of slots 44. It will be noted that 50 the Width of the short copper plates 35 is such that they V.never come into engagement with the lower set of slots 45. This results since the width between the opposed planes 5i of the side walls 42 of the arc chute housing 43 is less than the width of the short copper plates 35.
  • a modied steel plate 53 which is more clearly shown in Figs. 13 and 14.
  • the plate 53 has a recess 54 formed therein to accommodate the moving arc horn i2 in providing proper clearance therefor in the full open position of the breaker. This is only partly shown by the dotted lines of Fig. l.
  • the plate 53 also has the notches or recesses 35 provided in the side walls 55 thereof.
  • the upper edge 56 of the plate 53 has small notches or recesses 5l provided therein to permit the passage of arc gases across the top of the plate 53 to take advantage of the venting means provided at the left hand end 58 of the baille member 53, more fully described hereinafter.
  • the plate 53 has latch or hook portions 5G integrally formed therewith to hook or latch onto the left hand end of the baille member 59.
  • the extreme right end plate 6I of the arc extinguishing device 3, as viewed in Fig. 1, has a configuration more clearly shown in Figs. 11 and 12.
  • This plate i5 i as was the case with the plates 30, 53, is formed of steel. It has an enlarged cutout portion S2 to accommodate the magnetic stationary arc horn l. It also has the recesses 35 and hook or latch portions 59. Further, it has the recesses or notches 5l' as was the case with the plate 53.
  • the hook portions 5i! hook onto the right hand end 63 of the baille member 59 as viewed in Fig. 1.
  • two end plates 53, 6I of the spaced plate arc extinguishing device 3 hook or latch onto the opposed ends 58, 63 of the baille member 59.
  • our improved baille member 59 has a construction more clearly apparent from an examination of Figs. 1, 2, 5 and 6.
  • Fig. 5 which shows the right hand end 53 of the baille member 59
  • the hook portions 60 of the plate 6i may extend into the recessed or latched portions 54 formed in the end 53 of the baille member 59.
  • the baffle member 59 has its right hand end 63 rigidly held in place by the end iron plate 5l of the arc extinguishing device 3.
  • the left hand end 58 of the baille member 59 has recessed portions 65 formed in the end 53 thereof to permit engagement therewith of the hook portions 5B of the left hand steel plate 53 of the arc extinguishing structure 3. Consequently the plate 53 firmly latches and holds the end 5S of the baille member 59 in position as shown in Fig. l.
  • the baille member 59 is hence solely held in position by the hook portions 60 of the two plates 53, 5l. No other means is necessary for maintaining the baille member 59 in position. n
  • vent passages 55 are provided inthe end 58 of the baille member 59 oommunicating with the recessed portions E5. These vent passages 55 permit exit of the are gases out of the casing 43 through the left hand end 59 of the baille member 59.
  • small vent passages 61 are provided in the end 63 of the baille member 59 to facilitate venting of the arc gases adjacent the right hand end 63 of the baille member 59.
  • a plurality of rectangularly-shaped vent slots 98 Disposed along the length of the baille member 59 are formed a plurality of rectangularly-shaped vent slots 98, the configuration of which is more readily apparent from a study of Figs. l and 2. ⁇
  • transverse baille barriers 69 which preferably are in substantially the same vertical plane as the plates 39, 53 and 6l.
  • the short copper plates 36 are disposed in vertical planes which are intermediate the planes of the baille barriers 69. This construction lends itself readily tov facilitating the venting of the arc gases between the short copper plates 39 and the adjacently op- -posed steel plates 33 as indicated by the arrows 19 of Fig. l.
  • the tubes il lock the plates in place, and the end plates 53, 5i latch or lock the Following insertion of the insulating tubes il within the device 3, two stud bolts l2 are inserted through the tubes 'il from the left hand end of the arc extinguishing device 3 as viewed in Fig. l.
  • the right hand ends 73 of the stud bolts l2 are threaded and are threadedly secured into the threaded sleeves 'i4 molded within the base plate l.
  • the stud bolt 'l2 threadedly attaches the arc extinguishing device 3 rigidly in place on the oase plate i of the circuit breaker.
  • the entire arc extinguishing device 5 may be removed toward the left away from the base plate I.
  • the stud bolts l2 may easily be removed from the insulating tubes li. tinue to hold the device in its assembled state.
  • the tubes il may be removed from the right of the extinguisher 3, whereupon all of the plates 35, 35, 53 and 5l, together with the baille member 5.9 will loosely fall out of the housing 43 upon turning the same upside down.
  • our invention shows that it incorporates an arc chute of the V-shaped steel plate type together with copper plates for additional cooling and deionizing of the arc gases, a new type of bale member 59 and a simple interlocking means to hold the various component parts together.
  • the slotted insulating baille member 59 is located. so that its transverse barriers 39 come against the top ends of the steel and copper plates 39, 35 and thus interpose relatively long insulating slots 58 between the top of the plates and the atmosphere above the arc chute.
  • the barriers 59 are parallel with the grid plates 35, each of which has a barrier against it.
  • the arc gas when passing through the vent slots 58 of the baille member 59 which is madel of melamine, burns some of the melamine and the resultant gas is of such nature that it neutralizes some of the ionized gas. rIhis helps to prevent flash-over to ground from the topV of the arc chute.
  • a housing having a vent opening therefrom, means for establishing an arc, means for extinguishing the are within the housing including a plurality of spaced plates,I means for marring the. arc against the plates, baule means disposed in the vent opening for cooling and deionizing the arc gases passing out of the housing through the vent opening, and at least one of the plates having a latch portion at the end thereof remote. from the arc establishing means cooperating with a cooperating latch portion on the baffle means to hold the latter in position.
  • a plurality of spaced plates means for establishing an arc and moving the established arc into engagement with the spaced plates, a housing having a removable baille member associated therewith, and two of the spaced plates having hook portions formed thereon to hook and hold the bauleV member in position.
  • a housing having a vent opening therefrom, a removable baule member positioned within the vent opening during operation of the interrupter, removable eX- tinguishing means disposed within the housing, and latching means associated with the removable extinguishing means for latching and holding the baille member in position within the vent opening.
  • a housing having a vent opening therefrom, a removable baille.
  • means for establishing an are, a casing, removable arc extinguishing means disposed within the casing including a plurality of spacedv removable plates, the are moving into engagement with the plates during the opening operation of the interruptor, a vent opening leading out of the casing, a baille mem 'oer oi substantial thickness disposed within thevent opening and making abutting engagement with the edges of the plates nearest the vent opening to prevent establishment of an arcv across the plates, latching means associated with one or more of the plates to latch the baille mem--l ber in position, and holding means independently of the latching means for maintaining the plates in position.
  • a circuit interruptor including means for establishing an arc, extinguishing means for the are including a plurality of spaced plates of at 5 least two diierent types of different widths,
  • arc extinguishing means including a plurality of spaced plates of at least two olifferent types of different widths positioned within the housing for extinguishing the arc, two sets of grooves provided on the inner surface on each of the two side walls in different planes for maintaining the two diuerent types of plates in spaced relationship, the two sets of grooves being cut diierent depths into the interior of the inner surfaces of the two side walls, the narrower width of plate clearing the ridges of the deeper set of grooves, and the ridges of the shallower set of grooves being formed on the plane of the ridges of the deeper set of grooves.
  • An arc extinguishing means including 'lrlspaced plategextingushng Structure, the spaced.
  • housing means for positioning the plates in f plate extinguishing structure including at least two diierent types of plates of different widths, casing means for maintaining some of the plates in xed spaced relationship, the two opposed walls of the casing means each having two sets of interiorly disposed grooves in different planes, one type of plate of one width disposed in one set of grooves and the other type of plate of the other width being disposed in the other set of grooves, the two sets of grooves extending different depths into the interior of the inner walls of the two opposed walls, the narrower width of plate clearing the ridges of the deeper set of grooves, and the ridges of the shallower set of grooves being formed on the plane of the ridges of the deeper set of grooves.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US734444A 1947-03-13 1947-03-13 Circuit breaker Expired - Lifetime US2575730A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL77645D NL77645C (enrdf_load_stackoverflow) 1947-03-13
FR964187D FR964187A (enrdf_load_stackoverflow) 1947-03-13
US734444A US2575730A (en) 1947-03-13 1947-03-13 Circuit breaker
GB2692/48A GB634490A (en) 1947-03-13 1948-01-29 Improvements in or relating to arc extinguishing structures for electric circuit breakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US734444A US2575730A (en) 1947-03-13 1947-03-13 Circuit breaker

Publications (1)

Publication Number Publication Date
US2575730A true US2575730A (en) 1951-11-20

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Application Number Title Priority Date Filing Date
US734444A Expired - Lifetime US2575730A (en) 1947-03-13 1947-03-13 Circuit breaker

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US (1) US2575730A (enrdf_load_stackoverflow)
FR (1) FR964187A (enrdf_load_stackoverflow)
GB (1) GB634490A (enrdf_load_stackoverflow)
NL (1) NL77645C (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656442A (en) * 1950-11-13 1953-10-20 Allen Bradley Co Arc extinguishing electrical switch apparatus
US2708698A (en) * 1951-12-04 1955-05-17 Allis Chalmers Mfg Co Arc chute with barrier plates having arc constricting means
US2727111A (en) * 1951-11-01 1955-12-13 I T E Circuit Breaker Corp Arc chute design for circuit breakers
US2769066A (en) * 1953-02-02 1956-10-30 Westinghouse Electric Corp Circuit interrupters
DE1025483B (de) * 1957-10-03 1958-03-06 Asbestechieferfabrik Braunschw Verfahren zur Herstellung von Funkenschutzkammern aus Asbestzement mit eingesetzten Loeschblechen
US2866043A (en) * 1955-08-23 1958-12-23 Westinghouse Electric Corp Circuit breaker
US2868927A (en) * 1956-05-03 1959-01-13 Ite Circuit Breaker Ltd Solenoid interrupter
US2875301A (en) * 1954-02-08 1959-02-24 Westinghouse Electric Corp Circuit interrupter
DE1124125B (de) * 1956-12-24 1962-02-22 Westinghouse Electric Corp Elektrischer Schalter mit Lichtbogenloeschanordnung
US3031552A (en) * 1959-05-28 1962-04-24 Gen Electric Electric circuit interrupter
DE1132629B (de) * 1957-11-23 1962-07-05 Wissenschaftlich Tech Buero Fu Anordnung von Loeschblechen in den Loeschkammern einer Abdeckhaube fuer Schuetze
US3043938A (en) * 1960-05-24 1962-07-10 Arrow Hart & Hegeman Electric Arc suppressing plates and hood for electric switches
US3071666A (en) * 1959-04-09 1963-01-01 Westinghouse Electric Corp Circuit interrupters
US3182156A (en) * 1961-09-19 1965-05-04 Gen Electric Vacuum-type circuit interrupter
US3236980A (en) * 1963-12-13 1966-02-22 Allis Chalmers Mfg Co Unitized arc plate stack with reinforcing means
US3467799A (en) * 1965-12-08 1969-09-16 Murray Mfg Corp Elimination of arcing effects in circuit breakers
US3515829A (en) * 1965-05-21 1970-06-02 Gen Electric Current-limiting circuit breaker with novel arc initiating and extinguishing means
US4217472A (en) * 1977-11-02 1980-08-12 Gould Inc. Compact circuit breaker having high interrupting capacity
US20090233537A1 (en) * 2008-03-14 2009-09-17 Inventec Corporation Air baffle and calculation method of deformational stress thereof
CN102280329A (zh) * 2010-06-12 2011-12-14 西门子公司 熔断器隔离板及其熔断器

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB344988A (en) * 1929-01-18 1931-03-19 Ass Elect Ind Improvements relating to arc extinguishing devices for electric circuit interrupters
US1963643A (en) * 1933-02-23 1934-06-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2133158A (en) * 1936-12-17 1938-10-11 Gen Electric Circuit breaker
US2293513A (en) * 1939-10-11 1942-08-18 Gen Electric Electric air circuit breaker
US2337949A (en) * 1942-05-29 1943-12-28 Gen Electric Circuit breaker
US2353729A (en) * 1941-08-14 1944-07-18 Ite Circuit Breaker Ltd Air blast arc chute
US2416164A (en) * 1943-11-06 1947-02-18 Westinghouse Electric Corp Arc extinguishing structure
US2445190A (en) * 1944-12-20 1948-07-13 Gen Electric Electric circuit breaker

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB344988A (en) * 1929-01-18 1931-03-19 Ass Elect Ind Improvements relating to arc extinguishing devices for electric circuit interrupters
US1963643A (en) * 1933-02-23 1934-06-19 Westinghouse Electric & Mfg Co Circuit interrupter
US2133158A (en) * 1936-12-17 1938-10-11 Gen Electric Circuit breaker
US2293513A (en) * 1939-10-11 1942-08-18 Gen Electric Electric air circuit breaker
US2353729A (en) * 1941-08-14 1944-07-18 Ite Circuit Breaker Ltd Air blast arc chute
US2337949A (en) * 1942-05-29 1943-12-28 Gen Electric Circuit breaker
US2416164A (en) * 1943-11-06 1947-02-18 Westinghouse Electric Corp Arc extinguishing structure
US2445190A (en) * 1944-12-20 1948-07-13 Gen Electric Electric circuit breaker

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656442A (en) * 1950-11-13 1953-10-20 Allen Bradley Co Arc extinguishing electrical switch apparatus
US2727111A (en) * 1951-11-01 1955-12-13 I T E Circuit Breaker Corp Arc chute design for circuit breakers
US2708698A (en) * 1951-12-04 1955-05-17 Allis Chalmers Mfg Co Arc chute with barrier plates having arc constricting means
US2769066A (en) * 1953-02-02 1956-10-30 Westinghouse Electric Corp Circuit interrupters
US2875301A (en) * 1954-02-08 1959-02-24 Westinghouse Electric Corp Circuit interrupter
US2866043A (en) * 1955-08-23 1958-12-23 Westinghouse Electric Corp Circuit breaker
US2868927A (en) * 1956-05-03 1959-01-13 Ite Circuit Breaker Ltd Solenoid interrupter
DE1124125B (de) * 1956-12-24 1962-02-22 Westinghouse Electric Corp Elektrischer Schalter mit Lichtbogenloeschanordnung
DE1025483B (de) * 1957-10-03 1958-03-06 Asbestechieferfabrik Braunschw Verfahren zur Herstellung von Funkenschutzkammern aus Asbestzement mit eingesetzten Loeschblechen
DE1132629B (de) * 1957-11-23 1962-07-05 Wissenschaftlich Tech Buero Fu Anordnung von Loeschblechen in den Loeschkammern einer Abdeckhaube fuer Schuetze
US3071666A (en) * 1959-04-09 1963-01-01 Westinghouse Electric Corp Circuit interrupters
US3031552A (en) * 1959-05-28 1962-04-24 Gen Electric Electric circuit interrupter
US3043938A (en) * 1960-05-24 1962-07-10 Arrow Hart & Hegeman Electric Arc suppressing plates and hood for electric switches
US3182156A (en) * 1961-09-19 1965-05-04 Gen Electric Vacuum-type circuit interrupter
US3236980A (en) * 1963-12-13 1966-02-22 Allis Chalmers Mfg Co Unitized arc plate stack with reinforcing means
US3515829A (en) * 1965-05-21 1970-06-02 Gen Electric Current-limiting circuit breaker with novel arc initiating and extinguishing means
US3467799A (en) * 1965-12-08 1969-09-16 Murray Mfg Corp Elimination of arcing effects in circuit breakers
US4217472A (en) * 1977-11-02 1980-08-12 Gould Inc. Compact circuit breaker having high interrupting capacity
US20090233537A1 (en) * 2008-03-14 2009-09-17 Inventec Corporation Air baffle and calculation method of deformational stress thereof
CN102280329A (zh) * 2010-06-12 2011-12-14 西门子公司 熔断器隔离板及其熔断器
CN102280329B (zh) * 2010-06-12 2015-01-14 西门子公司 熔断器隔离板及其熔断器

Also Published As

Publication number Publication date
NL77645C (enrdf_load_stackoverflow)
FR964187A (enrdf_load_stackoverflow) 1950-08-08
GB634490A (en) 1950-03-22

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