US3492609A - Circuit interrupter trip contact resetting means - Google Patents

Circuit interrupter trip contact resetting means Download PDF

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Publication number
US3492609A
US3492609A US699458A US3492609DA US3492609A US 3492609 A US3492609 A US 3492609A US 699458 A US699458 A US 699458A US 3492609D A US3492609D A US 3492609DA US 3492609 A US3492609 A US 3492609A
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United States
Prior art keywords
contact
contact rod
pin
rod
rods
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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
US699458A
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English (en)
Inventor
Wasaburo Murai
Yujiro Yasojima
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.)
Terasaki Electric Co Ltd
Original Assignee
Terasaki Electric Co Ltd
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 claimed from JP501467A external-priority patent/JPS468358B1/ja
Priority claimed from JP501267A external-priority patent/JPS468356B1/ja
Application filed by Terasaki Electric Co Ltd filed Critical Terasaki Electric Co Ltd
Application granted granted Critical
Publication of US3492609A publication Critical patent/US3492609A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position

Definitions

  • an overcurrent responsive trip mechanism actuates an operating mechanism for switching one of the contact rods between its closed and normally open positions to put the one contact rod in its normally open position.
  • a pivotable holder for holding the one contact rod strikes against the reset element to return the other contact rod to its closed position ready for the succeeding closing operation.
  • the invention relates to improvements in a circuit interrupter of the type wherein upon the occurrence of a shortcircuit current, an electromagnetic repulsion generated between a pair of movable contact rods is utilized to early separate them from each other thereby to decrease an interruption time as well as giving the current limiting effect.
  • circuit interrupter of the type wherein upon the occurrence of a shortcircuit current an electromagnetic repulsion generated between a pair of movable contact rods to rotate them in the opposite directions, including improved means for effectively bringing the contact rods thus rotated into their normally open or tripped positions.
  • a circuit interrupter comprising a pair of movable contact rods disposed in substantially parallel relationship in the closed position of the interrupter, each of the contact rods being provided at one end with a contact and pivotably mounted at the other end on a pivot pin, spring means individual to each contact rod to normally apply a contact pressure to the association contact, an operating mechanism for switching one of the movable contact rods between its 3,492,609 Patented Jan.
  • the other contact rod having only the contacting function, thermally and electromagnetically responsive trip means operatively coupled to the operating mechanism, and a flow of extraordinarily eX- cessive current through the interrupter generating an electromagnetic repulsion on the pair of movable contact rods to rotate the movable contact rods in the opposite directions independently of the trip means thereby to interrupt the current, said contact rods being hel-d in their open positions through reversal of a force of each spring means, characterized in that slightly after the contact rods have been separated from each other the trip means perform the tripping operation to cause the constrained state of the operating mechanism to collapse thereby to automatically bring the pair of contact rods into their positions identical to the normally open positions in which the rods are put through the operation of the trip means.
  • the one movable contact rod may be pivotably mounted to a pivotable holder and a reset element of electrically insulating material is movably disposed in slightly spaced relationship between the holder and the other contact rod on those sides thereof remote from the respective contacts.
  • a reset element of electrically insulating material is movably disposed in slightly spaced relationship between the holder and the other contact rod on those sides thereof remote from the respective contacts.
  • FIGURE l is an elevational sectional view of a circuit interrupter in its closed position embodying the principles of the invention
  • FIGURE 2 is a fragmental side elevational view illustrating the process of moving a pair of movable contact rods from their closed positions to theiropen positions by the action of an electromagnetic repulsion generated between the contact rods due to the occurrence of a shortcircuit current;
  • FIGURE 3 is a fragmental side elevational view of the movable Contact rods after having been fully opened to interrupt a shortcircuit current
  • FIGURE 4 is a view similar to FIGURE 3 but illustrating a pair of movable contact rods in their tripped positions;
  • FIGURE 5 is a fragmental perspective view of one of the movable contact rods shown in FIGURES 1 to 4 inclusive;
  • FIGURE 6 ⁇ is a plan view of a reset element constructed in accordance with the principles of the invention.
  • FIG. 1 an arrangement illustrated cornprises a housing open at one end or the upper end as viewed in the same FIGURE 1, a cover member 12 detachably secured to the housing 10 at the open end, and a pair of movable contact rods 14 and 16 disposed in opposite relationship within the housing 10.
  • the housing and cover member and 12 respectively are moulding of any suitable, electrically insulating material and both the contact rods 14 and 16 are composed of any suitable, electrically conductive material.
  • the first and second contact rods 14 and 16 respectively are provided at one end with a pair of contacts 18 and 20 respectively. When in their closed positions, as shown in FIGURE 1, the contact rods 14 and 16 are positioned in substantially parallel relationship.
  • the first or upper Contact rod 14 is pivotably mounted by a pin 22 to a Contact holder 24 which is, in turn, pivotably mounted on a pivot pin 26 supported to a fixture block generally designated by the reference numeral 28.
  • the contact holder 24 has fixed at its upper end a connecting rod 30 of any suitable, electrically insulating material to which the contact holders for the outer poles (not shown) are connected.
  • the rst contact rod 14 is adopted to be movable between its closed and normally open positions by an operating mechanism which will be described hereinafter.
  • the first contact rod 1-4 includes a pair of parallel contact springs 32 having one end anchored to a spring shoe 34 loosely engaging a pin 36 secured to the contact rod 14 at a position located to the left of the pin 22 as viewed in FIGURE 1 and the other ends anchored to a spring shoe 38 loosely engaging a pin 40 secured to the contact holder 24 at a position located to the right of the said pin 22 as viewed in FIGURE 1.
  • the contact springs 32 serve normally to exert on the first or upper contact 18 a contact pressure under which the contact 18 is maintained in contact with the mating contact 20.
  • the contact springs 32 are adapted to move its line of action above the pin 22 to trigger the -first contact rod 14 to its open position independently of an operating mechanism therefor and maintain it in this open position.
  • a stopper 28a is rigidly secured to a fixture block 28 to determine the open position of the first contact rod 1-4. It is to be noted that the stopper 28a is operatively associated only with that the pole of the circuit interrupter including the fixture block, in the illustrated example, with the central pole of the three pole interrupter, while for each of the other poles a protrusion 12a is disposed on the internal wall surface of the cover member 12 at its position where all the first contact rods, such as 14 are substantially aligned with each other in their open positions.
  • the contract holder 24 is provided at one and near to the associated contact with an abutment 22a opposite to the pin 36 and the contact holder 24 is also provided at the other end with an overhang 24b for the purpose as will be apparent hereinafter.
  • the second or lower contact rod 16 is pivotably mounted to a support block 42 by a pivot pin 44 and has a pair of reversing levers 46 disposed in spaced, parallel relationship on both sides thereof.
  • the support block 42 is rigidly secured to the bottom surface of the housing 10.
  • the reversing levers 46 each are pivotably supported at one end near to the contact l on a pivot pin 48 disposed on the support block 42 and are provided on the middle portion with an L-shaped slot 50.
  • the other ends of the reversing levers 46- are connected together by a pin 52 and a pair of spring shoes -54 loosely engage the pin 52 at both ends (see FIGURE 5).
  • a pin 56 extends through the middle portion of the lower contact rod 16 against movement and has secured at both ends a pair of spring shoes 58 to which a pair of contact springs 60' are anchored respectively.
  • the contact springs 60 ⁇ have the other ends anchored to the spring shoes 54.
  • the second contact rod 16 further comprises a driving pin 62 movably inserted into the slots 50 on the reversing levers 46.
  • the second contact rod 16 is operatively associated with a stopper 64 disposed on the support block 42 thereby to prevent an excessive rotation of the second contact rod 16 about the axis of the pin 44 in the clockwise direction as viewed in FIG- URE 1.
  • the second contact rod 16 is electrically connected through a fiexible electrically conductor 66 to an electrical conductor 68 adapted to be electrically connected to a source of electrical power (not shown).
  • the first contact rod 14 is electrically connected through a fiexible conductor 70, and a conductor 72 to an intermediate terminal 74 screw-threaded to the housing 10.
  • the second contact rod 16 tends to be normally rotated about its axis of rotation to have exerted thereon a predetermined contact pressure with respect to the first contact rod 14 by the action of the contact springs 60.
  • the second contact rod is permitted to be rotated about its axis of rotation in the counterclockwise direction as viewed in FIGURE 1 by the action of the said electromagnetic repulsion until it abuts against the stopper l64.
  • An H-shaped reset element 76 of any suitable electrically insulating material is disposed between the overhang 24b of the contact holder 24 and the adjacent end of the second contact rod ⁇ 16 for the purpose as will be apparent hereinafter. More specifically, the support block 42 has an extension 42a obliquely and upwardly directed from the righthand edge (as viewed in FIGURE 1) toward the overhang 24b of the contact holder 24 and forming a narrow guide passageway 78 with a ramp surface 10a disposed in parallel to the extension 42a of the housing 10.
  • the reset element 76 is slidably disposed within the tilted guide passageway 7 8 in such a manner that a pair of leg portions on one side or the upper side (as viewed in FIGURE l) of the H forming a recess 76a are disposed adjacent the overhang 24b on the end of the contact holder 24 while a pair of leg portions on the other side of the H forming recess 76h have interposed therebetween that end of the second contact rod 16. It is noted that the reset element is not physically connected to both the contact holder and the second contact rod.
  • the circuit interrupter includes an .operating mechanism generally designated by the reference numeral 80.
  • the operating mechanism 80 comprises an operating handle 82 movably projecting from the cover member 12, a switching lever 84 secured at one end to the operating handle 82 and pivotably mounted at the other end on a stationary pin 86 secured to the Afixture block 28, and a pair of toggle link members 88 and 90 articulated by a toggle pin 92.
  • the mechanism further comprises a pair of tension springs 94 spanned between a spring shoe 84a disposed at that end of the switching lever 84 integrally connected to the operating handle 82 and a spring shoe 92a loosely engaging the toggle pin 92.
  • the operating mechanism 80 is operatively coupled to a trip mechanism of the conventional design generally designated by the reference numeral 95. More specifically the link member 90 engages at 96 to a trip lever 98 pivotably mounted at one end on a stationary pin 100 secured to the xture block 28 and engaging at the .other end a primary hook 102. 'I'hen the primary hook 102 engages a secondary hook 104 extending in a casing 106 of any suitable electrically insulating material.
  • an overcurrent responsive trip mechanism Disposed within the casing 106 is an overcurrent responsive trip mechanism generally designated by the reference numeral 105.
  • the mechanism element cornprises a bimetallic element 108 adapted to be heated with an excessive current flowing through a main conductor 110 electrically connected to the intermediate terminal 74 and an instantaneously tripping electromagnet assembly 112 inductively coupled to the conductor 110.
  • the conductor 110 is adapted to be electrically connected to a load (not shown). The remaining components within the casing 106 will be described in conjunction with the description ⁇ of the operation of the circuit interrupter.
  • the operating handle 82 can be thrown to the OFF side or in the righthand direction as viewed in FIGURE l to cause the constrained state of the two toggle link members 88 and 90 to collapse thereby to permit the pivot pin 22 connecting the first contact rod 14 to the holder 24 to be raised.
  • This causes the first contact 18 to be rotated about the axis of the pin 26 in the clockwise direction as viewed in FIGURE 1 to be separated from the second contact 20 until the interrupter reaches its OFF position.
  • clockwise or counter clockwise direction used hereinafter means one as viewed in the associated figure.
  • the circuit interrupter thus open can be again closed by throwing the operating handle 82 to the ON side or reversely from the turning-OFF operation.
  • the contact springs 60 permit the second contact rod 16 only to follow the rst contact rod 14 by a very short angular distance suicient to engage the other end of the contact rod 16 with the associated stopper 64. Therefore the second contact rod 16 will remain in its position substantially identical to that illustrated in FIG- URE 1.
  • the holder 24 for holding the first contact rod 14 is maintained in its closed position by means of the operating mechanism whereas the first contact rod 14 is rotated about the axis of the pin 22 in the clockwise direction by the action of the electromagnetic repulsion until the line of action of the contact springs 32 passes upwardly through the pin 22 whereupon its force is reversed in direction.
  • the second contact rod 16 Simultaneously with the initiation of rotation of the rst contact rod 14 as above described, the second contact rod 16 also begins to be rotated about the axis of the pin 44 in the opposite or counterclockwise direction by the action of the electromagnetic repulsion as shown in FIGURE 2.
  • the axis of the spring pin S6 has been moved from a position A to B as shown in FIGURE 2 whereupon the contact spring 60 has the line of action coinciding with a line passing through the position B and A of the axis of the spring pins 56 and 48.
  • the spring pin 56 is moved from a position H to a position G as shown in FIGURE 3 while its line of action is moved below the pin 48 whereby the reversing levers 46 are rotated in the clockwise direction about the axis of the pin 48 until it stops at its position as illustrated in the same ligure at which the pin 44 engages the upper edge of the L-shaped slot 50 on each lever 46.
  • the overcurrent responsive trip mechanism 105 is adapted to be operated with a very small time delay.
  • the operation of the overcurrent responsive trip mechanism 105 is accompanied by collapse of the constrained state of the operating mechanism 80 to cause the toggle link members 88 and 90 to raise the pin 22.
  • the tirst contact rod 14 is rotated in the counterclockwise direction about that point thereon contacting with the stopper 28 or the protrusion 12a as the case may be.
  • the spring pin 56 reaches the position H (see FIGURE 4) to pass the line of action of the springs 60 through the axis of the pin 48.
  • the driving pin 62 abuts against the upper edge of the 'L-shaped slots y50 to raise the reversing levers 46.
  • This causes the reversing levers 46 to rotate in the counterclockwise direction thereby to return the spring pin 52 to a position A to bring the line of action of the springs 60 on the line A-A' until the second contact rod 116 is stopped in its tripped position as illustrated in FIGURE 4.
  • the succeeding closing operation can be performed in the conventional manner. Namely the operating handle 82 can be manually thrown to the OFF side to reset the interrupter. Then the handle 82 will be manually brought into the ON position to perform the closing operation.
  • the present interrupter is of the one point interruption type the first and second contact rods can be separated from each other by a distance larger than the normal separating distance therebetween upon the occurrence of an extraordinarily excessive current such as a shortcircuit current.
  • This establishes a sufficient interruption distance to improve the current limiting effect as in the two point interruption type of circuit interrupters.
  • the rst and second contact rods are automatically and substantially simultaneously brought into their normally open or tripped positions, whereby the circuit interrupter is ready for the succeeding closing operation. This contributes to great improvements in performances of the circuit interrupters utilizing an electromagnetic repulsion.
  • the reset element 76 is held separated from the contact rods 14 and 16 and/or holder 24 so as to eifectively utilize an impulse due to the trip operation to return the second Contact rod to its closed position and still be protected from damaging due to such an impulse.
  • the conventional type of circuit interrupter having a reset element physically connected between a rst contact rod or its holder and a second contact rod was disadvantageous in that any impulse due to a trip operation could damage the connection of the reset element and either of the contact rod or its holder as well as complicating the assembling operation.
  • the striker 24b and the struck surface of the second moved contact rod 16 are required to be disposed substantially normally to the plane of the reset element 76.
  • the guide passageway for the reset element must be formed in a complicated manner because the direction of the passageway does not coincide with the standard direction in which the resulting part is removed.
  • the reset element 76 is slidably held within the guide passageway 78 conned by the tilted wall surface 10a of the housing 10 and the extension 42a bent from the support block 42 thereby to be separated from the contact rods and the holder. Therefore the assembling operation is easily performed and the molding process is simplified. Also one Wall of the passageway is composed of the extension of the support block 42 resulting in a small sized circuit interrupter.
  • the second contact rod 16 is given a moment of force equal to the product of a force f provided by the contact springs 60, multiplied by a length of a perpendicular l drawn from the axis of the rotation 44 to the line of action of the contact springs 60.
  • the contact rod has applied thereto the requested contact pressure.
  • an electromagnetic repulsion causes rotational movement of the second contact rod 16 to transfer the line of action of the springs 60 from line A-A' to B-B. This prevents the reversing levers 46 from being given the moment of force provided by the contact springs 60.
  • the contact spring 60 has one point inimuy ined at the point D' shown in FIGURE 3, the same has the line of action coinciding with the line A-D, this causes a decrease in the length of the perpendicular e drawn from the axis of rotation 44 to the said line of action with the result that a sufficient moment of force supplying a contact pressure on the second contact rod 16 can not lbe produced.
  • the line of action of the contact .spring 60 is desired to be reversed in direction at the position D' while a sufficient contact pressure is exerted on the second contact rod 16, the anchor point where the spring 60 is anchored should extend to a position F while at the same time the spring and contact rods 60 and 16 respectively increase in length. This not only makes contact assembly large-sized but also the moment of force or the contact pressure can not rapidly decrease after the passage through the position C.
  • a circuit interrupter comprising a pair of movable contact rods disposed in substantially parallel relationship in the closed position of the interrupter, each of said contact rods being provided at one end with a ,contact and pivotally mounted at the other end on a pivot pin, an operating mechanism for switching one of said movable contact rods between its closed and open positions, thermally and electromagnetically responsive trip means operatively coupled to said operating mechanism, and said contact rods providing a ow of extraordinary excessive current through the interrupter for generating an electromagnetic repulsion Ibetween said pairs of movable Contact rods to rotate the other contact rod independently of said trip means thereby to interrupt the current, the other contact rod when rotated being held in its open position, a pivotable holder on which said one of movable contact rods is pivotably mounted, said holder being provided on that end thereof remote from the associated contact with an overhand, and a reset element of electrically insulating material being movably disposed in spaced relationship ⁇ between said overhand on said holder and the adjacent end of the other movable contact
  • a circuit interrupter as claimed in claim 1 in which a housing is provided for'said interrupter having a tilted wall surface therein, and a support block in said housing for movably supporting the other contact rod, said support block being spaced from said tilted wall surface of the housing to define a guide passageway, and said reset element being slidably disposed in said guide passageway.
  • a circuit interrupter comprising a pair of movable contact rods disposed in substantially parallel relationship in the closed position of the interrupter, each of said contact rods being provided at one end with a contact and pivotably mounted at the other end on a pivot pin, an operating mechanism for switching one of said movable contact rods between its closed and open positions, thermally and electromagnetically trip means operatively coupled to said operating mechanism, and said contact rods providing a flow of extraordinarily excessive current through the interrupter for generating an electromagnetic repulsion between said pair of movable contact rods to rotate said movable contact rods in the opposite directions independently of said trip means to interrupt the current, said pair of contact rods when rotated being held in their open positions, a pivotable holder on which said one of movable contact rods is pivotably mounted, said holder being provided on that end thereof remote from the associated contact with an overhand, and a reset element of electrically insulating material beinglmovahbly disposed in spaced relationship between said overhang on said holder and the adjacent end of the other
  • a circuit interrupter as claimed in claim 4 in which a housing is provided for said interrupter having a tilted wall surface therein, and a support block in said housing for movably supporting the other contact rod, said support block being spaced from said tilted wall surface of 1 1 l 1 2 the housing to dene a guide passageway, and said reset References Cited www element being slidably disposed in said guide passageway.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US699458A 1967-01-27 1968-01-22 Circuit interrupter trip contact resetting means Expired - Lifetime US3492609A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP501467A JPS468358B1 (de) 1967-01-27 1967-01-27
JP501267A JPS468356B1 (de) 1967-01-27 1967-01-27
JP501367 1967-01-27

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US3492609A true US3492609A (en) 1970-01-27

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Application Number Title Priority Date Filing Date
US699458A Expired - Lifetime US3492609A (en) 1967-01-27 1968-01-22 Circuit interrupter trip contact resetting means

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US (1) US3492609A (de)
DE (1) DE1638154C3 (de)
FR (1) FR1551832A (de)
GB (1) GB1210102A (de)
NL (1) NL142271B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582587A (en) * 1969-02-03 1971-06-01 Gen Electric Vacuum-type circuit interrupter having a stroke length dependent upon current magnitude
US4470027A (en) * 1982-07-16 1984-09-04 Eaton Corporation Molded case circuit breaker with improved high fault current interruption capability
US4482877A (en) * 1983-03-28 1984-11-13 General Electric Company Electric circuit breakers having fast short circuit response
US4527027A (en) * 1982-07-16 1985-07-02 Eaton Corporation Molded case circuit breaker with improved high fault current interruption capability
US4650946A (en) * 1985-11-27 1987-03-17 Westinghouse Electric Corp. Circuit breaker with stop plate for contact arm
US4745384A (en) * 1986-07-24 1988-05-17 Mitsubishi Denki Kabushiki Kaisha Circuit interrupter
US4748428A (en) * 1986-08-04 1988-05-31 Mitsubishi Denki Kabushiki Kaisha Multi-pole circuit interrupter
US4794357A (en) * 1986-08-04 1988-12-27 Mitsubishi Denki Kabushiki Kaisha Multi-pole circuit interrupter
US4855549A (en) * 1986-07-24 1989-08-08 Mitsubishi Denki Kabushiki Kaisha Circuit breaker

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220935A (en) * 1978-10-16 1980-09-02 Westinghouse Electric Corp. Current limiting circuit breaker with high speed magnetic trip device
US4259651A (en) * 1978-10-16 1981-03-31 Westinghouse Electric Corp. Current limiting circuit interrupter with improved operating mechanism
US4255732A (en) * 1978-10-16 1981-03-10 Westinghouse Electric Corp. Current limiting circuit breaker
IT1184864B (it) * 1985-01-29 1987-10-28 Cge Comp Gen Elettromecc Disposizione atta ad evitare e/o ritardare la richiusura di contatti in interruttori limitatori di corrente dopo un'apertura dei medesimi per repulsione
IT206253Z2 (it) * 1985-10-18 1987-07-13 Sace Spa Interruttore elettrico limitatore di corrente ad apertura dei contatti per repulsione elettrodinamica.
FR2590404B1 (fr) * 1985-11-15 1990-08-10 Telemecanique Electrique Disjoncteur comportant un electro-aimant de telecommande d'un contact escamotable d'interrupteur et un organe de transmission du mouvement de l'armature de l'electro-aimant en un point de ce contact centre sur l'axe de deplacement de l'armature
DE3614866A1 (de) * 1986-05-02 1987-11-05 Licentia Gmbh Kontaktanordnung fuer strombegrenzende niederspannungs-leistungsschalter
US4810841A (en) * 1986-07-31 1989-03-07 Siemens Aktiengesellschaft Current-limiting switching element
US4951022A (en) * 1988-12-15 1990-08-21 A. B. Chance Company Sensitive latch and trip mechanism
GB2246909B (en) * 1990-07-16 1995-02-22 Terasaki Denki Sangyo Kk Circuit breaker including forced contact parting mechanism capable of self-retaining under short circuit condition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1343823A (fr) * 1961-10-27 1963-11-22 Licentia Gmbh Interrupteur limitateur du courant
US3127488A (en) * 1960-07-18 1964-03-31 Ite Circuit Breaker Ltd Current limiting circuit breaker having both contacts movable
US3317866A (en) * 1963-02-07 1967-05-02 Terasaki Denki Sangyo Kk Automatic circuit interrupter having magnetic blowoff means
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127488A (en) * 1960-07-18 1964-03-31 Ite Circuit Breaker Ltd Current limiting circuit breaker having both contacts movable
FR1343823A (fr) * 1961-10-27 1963-11-22 Licentia Gmbh Interrupteur limitateur du courant
US3317866A (en) * 1963-02-07 1967-05-02 Terasaki Denki Sangyo Kk Automatic circuit interrupter having magnetic blowoff means
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582587A (en) * 1969-02-03 1971-06-01 Gen Electric Vacuum-type circuit interrupter having a stroke length dependent upon current magnitude
US4470027A (en) * 1982-07-16 1984-09-04 Eaton Corporation Molded case circuit breaker with improved high fault current interruption capability
US4527027A (en) * 1982-07-16 1985-07-02 Eaton Corporation Molded case circuit breaker with improved high fault current interruption capability
US4482877A (en) * 1983-03-28 1984-11-13 General Electric Company Electric circuit breakers having fast short circuit response
US4650946A (en) * 1985-11-27 1987-03-17 Westinghouse Electric Corp. Circuit breaker with stop plate for contact arm
US4745384A (en) * 1986-07-24 1988-05-17 Mitsubishi Denki Kabushiki Kaisha Circuit interrupter
US4855549A (en) * 1986-07-24 1989-08-08 Mitsubishi Denki Kabushiki Kaisha Circuit breaker
US4748428A (en) * 1986-08-04 1988-05-31 Mitsubishi Denki Kabushiki Kaisha Multi-pole circuit interrupter
US4794357A (en) * 1986-08-04 1988-12-27 Mitsubishi Denki Kabushiki Kaisha Multi-pole circuit interrupter

Also Published As

Publication number Publication date
NL6800890A (de) 1968-07-29
DE1638154B2 (de) 1972-09-07
FR1551832A (de) 1968-12-27
GB1210102A (en) 1970-10-28
DE1638154A1 (de) 1971-03-25
NL142271B (nl) 1974-05-15
DE1638154C3 (de) 1975-01-16

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