US2506991A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2506991A
US2506991A US658604A US65860446A US2506991A US 2506991 A US2506991 A US 2506991A US 658604 A US658604 A US 658604A US 65860446 A US65860446 A US 65860446A US 2506991 A US2506991 A US 2506991A
Authority
US
United States
Prior art keywords
arc
contact
portions
contacts
shield
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
US658604A
Other languages
English (en)
Inventor
Brown Robert Lowell
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.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation 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
Application filed by Bendix Aviation Corp filed Critical Bendix Aviation Corp
Priority to US658604A priority Critical patent/US2506991A/en
Priority to GB7215/47A priority patent/GB622382A/en
Priority to FR943335D priority patent/FR943335A/fr
Application granted granted Critical
Publication of US2506991A publication Critical patent/US2506991A/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
    • H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc

Definitions

  • the present application relates to circuit breakers and more particularly to a novel contact and shield arrangement for minimizing and confining the arc resulting upon opening the contacts of a circuit breaker.
  • Another object of the invention is to provide a 'novel shielded arc chamber formed of an insulating arc resistant material to prevent flashover of the arc to portions of the circuit breaker other than the contacts and including novel means for effecting the lengthening of the arc sufficient to extinguish it.
  • Another object of the invention is to provide a shielded arc chamber including wall portions to prevent the arc from transferring to portions of the contact switch arm or back-up plate or to portions of the actuating solenoid or conductors and including a conical shaped vent and suitable magnetic arc blow-out arrangement to allow the arc to be lengthened sufficiently to cause its extinction without danger of its transferring to undesired portions of the circuit breaker.
  • Figure 1 is a sectional view of a circuit breaker embodying the invention.
  • Figure 2 is a side view of a pair of the novel contacts and illustrating the compound construction of the same.
  • Figure 3 is a perspective view of one of the shielded contact chambers shown in Figure 1.
  • Figure 4 is a sectional view taken along the lines 4-4 of Figure 1 and looking in the direction of the arrows.
  • numeral I indicates a circuit breaker including a movable switch arm 2 operated by suitable means such as the rod 3 actuated by a solenoid or other convenient means not shown.
  • the arm 2 carries contacts of compound construction and indicated generally by numeral 4.
  • the compound contacts 4 are mounted at opposite ends of the arm 2 and are arranged to mate with similar contacts 5.
  • Each of the contacts 4 and 5 includes a centrai or main portion 6 of high conductivity material such as silver or other suitable material and aligned with the portion 8 and positioned at opposite ends thereof are end or auxiliary portions 'I formed of carbon or other suitable arc resistant electrical conducting material.
  • the portions E and I of the compound contacts are mounted on suitable electrical conducting bars 8.
  • the compound contacts 4 are electrically con nected to the movable switch arm 2 through the conducting bars l.
  • the compound contacts 5 are mounted in an arc shield indicated generally by the numeral 9 and formed of a suitable arc resistant electrical insulation material such as porcelain or an asbestos concrete mixture. Suitable electrical connections not shown lead to the compound contacts 5 through the bar 8 thereof.
  • the shield 9 forms an arc chamber indicated by the numeral Ill and in which the compound contact 5 is positioned.
  • the walls of the arc chamber are arranged so as to t tightly around the compound contact 5.
  • the arc chamber has a barrier or cut out recessed wall portion II of a lower level than the top of the compound contact 4 so as to permit movement of the switch arm 2 and contact 4 into contacting relation with the compound contact 5, but the barrier IIy extends suillciently above the top of compound contact 5 to prevent the arc resulting upon the opening of contact 5 from transferring to undesired portions.
  • a permanent magnet I2 is mounted in the arc shield 9 and has opposite poles I3 and I4 positioned substantially at a ninety degree angle to the aligned portions 6 and 1 of the contact 5 so that the magnetic field of the magnet is so oriented with respect to the compound contacts 5 that upon the compound contact 4 opening the contact 5 the resultant arc is blown outward by the magnetic field onto one or the other of the carbon or arc resistant portions 1, depending upon the direction of current iiow.
  • the burning or destructive effect of the arc will be conilned by the wall portions of the arc shield 9 and minimized at the arc resistant portions 1.
  • conical shaped vents I5 extend through the wall portion of the shield 9.
  • Each of the The barrier -ll and Wall of the shield 9 surroundin'g the arc chamber I0, together with the conical shaped vents I in the wall of the shield 9 and magnetic blow out arrangement I2 causes the lengthening of the arc sufficiently to eiect its extinction, while confining the arc so that it may not transfer to undesired portions of the circuit breaker.
  • each of said members including a main portion formed of silver having a high electrical ⁇ conductivity land an auxiliary portion posi- .tioned at opposite ends of the main portion and formed of anarc-resistant electrical conductive carbon, the main portion of each of said contact members protruding above the surface of the auxiliary portion so that conduction when the contact members are closed is between the main portions of each of said contact members,
  • a switch arm for moving one of said contact mem- 'bers relative to the other, and a shield formed of an arc-resistant porcelain insulating material, said shield having a wall portion surrounding said contact members so as to form a chamber within which said Contact members are positioned, the wall portion of said shield having a recess for permitting movement of the switch arm and the one contact member relative to the other contact member, and the Wall portion of said shield having conical vents formed therein which open from said chamber, said conical vents extending at an acute angle from immediately adjacent said auxiliary portions oi' said contact members to the exterior, said conical vents having an inner open end of greater diameter than the outer open end and arranged so as to permit lengthening of the arcfrom the auxiliary portions to the exterior for effecting extinction thereof.
  • each of said contacts including at least two portions, a i'lrst portion formed of a material having a relatively high electrical conductivity and a second portion formed of an electrical conducting material having greater arc resistant properties than said iirst portion, said first and second portions extending in alignment at a substantially ninety-degree angle to the magnetic iield of said blow-out magnet so that upon separation of said contacts a resulting arc is blown onto the second portions of said contacts, a shield formed of an arc-resistant electrical insulating material, and said shield having a wall portion surrounding said contacts so as to form a chamber within which said contacts are positioned; said arrangement being particularly characterized by the rst portion of each contact protruding suiciently above the surface of the second more arc-resistant portion of the contact as to assure that all contact closing pressure is applied to the iirst portions of said contacts, and the wall portion

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
US658604A 1946-04-01 1946-04-01 Circuit breaker Expired - Lifetime US2506991A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US658604A US2506991A (en) 1946-04-01 1946-04-01 Circuit breaker
GB7215/47A GB622382A (en) 1946-04-01 1947-03-14 Improvements in or relating to electric circuit-breakers having arc-extinguishing means
FR943335D FR943335A (fr) 1946-04-01 1947-03-15 Perfectionnements aux dispositifs interrupteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US658604A US2506991A (en) 1946-04-01 1946-04-01 Circuit breaker

Publications (1)

Publication Number Publication Date
US2506991A true US2506991A (en) 1950-05-09

Family

ID=24641929

Family Applications (1)

Application Number Title Priority Date Filing Date
US658604A Expired - Lifetime US2506991A (en) 1946-04-01 1946-04-01 Circuit breaker

Country Status (3)

Country Link
US (1) US2506991A (fr)
FR (1) FR943335A (fr)
GB (1) GB622382A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629035A (en) * 1948-02-12 1953-02-17 Post Glover Electric Company Magnetic blowout construction and shield
US2725446A (en) * 1950-11-18 1955-11-29 Westinghouse Electric Corp Circuit interrupter
DE1052499B (de) * 1956-07-09 1959-03-12 Ckd Modrany Narodni Podnik Metallene Loeschkammer fuer elektrische Schaltgeraete
US2890309A (en) * 1957-06-26 1959-06-09 Allis Chalmers Mfg Co Multiple break electric switch
DE1102857B (de) * 1959-04-21 1961-03-23 Albrecht Jung G M B H Sicherungstrennschalter
US3376401A (en) * 1964-08-29 1968-04-02 Telemecanique Electrique Arc blow-out devices in current-breaking apparatus
US3626124A (en) * 1969-11-17 1971-12-07 Peter A Denes Arc and spark extinguishing contacts utilizing single domain magnetic particles
US4404443A (en) * 1980-10-03 1983-09-13 Thomson-Csf Electromagnetic relay
US5004874A (en) * 1989-11-13 1991-04-02 Eaton Corporation Direct current switching apparatus
US5130504A (en) * 1990-08-29 1992-07-14 Eaton Corporation Bi-directional direct current switching apparatus having bifurcated arc runners extending into separate arc extinguishing chambers
US5138122A (en) * 1990-08-29 1992-08-11 Eaton Corporation Bi-directional direct current switching apparatus having arc extinguishing chambers alternatively used according to polarity applied to said apparatus
US20050285704A1 (en) * 2003-02-21 2005-12-29 Hiroyuki Imanishi DC relay
US20130154775A1 (en) * 2011-12-20 2013-06-20 Lsis Co., Ltd. Auxiliary contact mechanism for magnetic contactor
DE102018204973A1 (de) 2018-04-03 2019-10-10 Volkswagen Aktiengesellschaft Schützbaugruppe, Batterie, Photovoltaikeinheit, Fortbewegungsmittel und Produktionsstraße

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US777631A (en) * 1903-03-20 1904-12-13 Westinghouse Electric & Mfg Co Switch for arc-lamp circuits.
US1132786A (en) * 1912-02-16 1915-03-23 Westinghouse Electric & Mfg Co Circuit-interrupter.
US1475144A (en) * 1919-07-04 1923-11-20 Krupp Ag Electric switch device
US2101783A (en) * 1935-05-03 1937-12-07 Leyhausen Wilhelm Spark chamber for automatic cut-outs
US2155276A (en) * 1936-05-28 1939-04-18 Gen Electric Quenching chamber for electric gas switches
US2166828A (en) * 1938-06-28 1939-07-18 Gen Electric Alternating current circuit interrupter
US2314292A (en) * 1939-10-11 1943-03-16 Gen Electric Electric arc-extinguishing apparatus
US2351426A (en) * 1942-08-22 1944-06-13 Gen Electric Electric switch

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US777631A (en) * 1903-03-20 1904-12-13 Westinghouse Electric & Mfg Co Switch for arc-lamp circuits.
US1132786A (en) * 1912-02-16 1915-03-23 Westinghouse Electric & Mfg Co Circuit-interrupter.
US1475144A (en) * 1919-07-04 1923-11-20 Krupp Ag Electric switch device
US2101783A (en) * 1935-05-03 1937-12-07 Leyhausen Wilhelm Spark chamber for automatic cut-outs
US2155276A (en) * 1936-05-28 1939-04-18 Gen Electric Quenching chamber for electric gas switches
US2166828A (en) * 1938-06-28 1939-07-18 Gen Electric Alternating current circuit interrupter
US2314292A (en) * 1939-10-11 1943-03-16 Gen Electric Electric arc-extinguishing apparatus
US2351426A (en) * 1942-08-22 1944-06-13 Gen Electric Electric switch

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629035A (en) * 1948-02-12 1953-02-17 Post Glover Electric Company Magnetic blowout construction and shield
US2725446A (en) * 1950-11-18 1955-11-29 Westinghouse Electric Corp Circuit interrupter
DE1052499B (de) * 1956-07-09 1959-03-12 Ckd Modrany Narodni Podnik Metallene Loeschkammer fuer elektrische Schaltgeraete
US2890309A (en) * 1957-06-26 1959-06-09 Allis Chalmers Mfg Co Multiple break electric switch
DE1102857B (de) * 1959-04-21 1961-03-23 Albrecht Jung G M B H Sicherungstrennschalter
US3376401A (en) * 1964-08-29 1968-04-02 Telemecanique Electrique Arc blow-out devices in current-breaking apparatus
US3626124A (en) * 1969-11-17 1971-12-07 Peter A Denes Arc and spark extinguishing contacts utilizing single domain magnetic particles
US4404443A (en) * 1980-10-03 1983-09-13 Thomson-Csf Electromagnetic relay
US5004874A (en) * 1989-11-13 1991-04-02 Eaton Corporation Direct current switching apparatus
US5130504A (en) * 1990-08-29 1992-07-14 Eaton Corporation Bi-directional direct current switching apparatus having bifurcated arc runners extending into separate arc extinguishing chambers
US5138122A (en) * 1990-08-29 1992-08-11 Eaton Corporation Bi-directional direct current switching apparatus having arc extinguishing chambers alternatively used according to polarity applied to said apparatus
US20050285704A1 (en) * 2003-02-21 2005-12-29 Hiroyuki Imanishi DC relay
US7145422B2 (en) * 2003-02-21 2006-12-05 Sumitomo Electric Industries, Ltd. DC relay
US20130154775A1 (en) * 2011-12-20 2013-06-20 Lsis Co., Ltd. Auxiliary contact mechanism for magnetic contactor
US8890639B2 (en) * 2011-12-20 2014-11-18 Lsis Co., Ltd. Auxiliary contact mechanism for magnetic contactor
DE102018204973A1 (de) 2018-04-03 2019-10-10 Volkswagen Aktiengesellschaft Schützbaugruppe, Batterie, Photovoltaikeinheit, Fortbewegungsmittel und Produktionsstraße

Also Published As

Publication number Publication date
FR943335A (fr) 1949-03-04
GB622382A (en) 1949-05-02

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