US2047816A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2047816A
US2047816A US18138A US1813835A US2047816A US 2047816 A US2047816 A US 2047816A US 18138 A US18138 A US 18138A US 1813835 A US1813835 A US 1813835A US 2047816 A US2047816 A US 2047816A
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US
United States
Prior art keywords
circuit
conductor
bridging
compartment
circuit breaker
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
US18138A
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English (en)
Inventor
Winfield A Atwood
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US18127A priority Critical patent/US2047824A/en
Priority to US18138A priority patent/US2047816A/en
Priority to DEA79199D priority patent/DE723326C/de
Priority to GB11936/36A priority patent/GB462790A/en
Application granted granted Critical
Publication of US2047816A publication Critical patent/US2047816A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • H01H71/0207Mounting or assembling the different parts of the circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/52Manual reset mechanisms which may be also used for manual release actuated by lever

Definitions

  • My invention relates to circuit breakers, more particularly toycircuit breakers of the trip-free type in which the circuit controlling contacts are manually operable Abetween open and closed circuit positions andare automatically operable to open circuit position upon the occurrence of predeterminedabnormal current conditions, and has l for an object the provision of a circuit breaker of this type which is simple and reliable in its operation and inexpensive to construct.
  • circuit breakers of this general type with suitable explosion-proof, arc extinguishing devices so as to combine the protective features of a fuse and the ladvantages of a manually operable switch, and such circuit breakers have found considerable application in the control of distribution and feeder circuits.
  • circuits of this type especially in industrial applications, the circuit breaker is often required t carry normal currents of considerable magnitude and to interrupt extremely large currents in case a fault or short circuit occurs in the system. .'I'he circuit breaker must therefore be provided with conducting and interrupting elements of ⁇ con siderable size and the circuit breaker operating mechanism must be strong and rugged, which necessitates the use of heavy operating springs.
  • circuit breaker usuallybelng provided with a single operating mechanism for opening and closing all of the circuits.
  • I provide a circuit breaker comprising relatively movable contacts and an operating mechanism therefor which includes a manually operable mechanism of rugged construction for moving the contacts between open and closed circuit positions with a snap action, and current responsive means including a normally' latched tripping arm biasedby suitable trippingA springs for operating the' contacts to-.open circuit position upon the occurrence of abnormal current conditions.
  • I provide a. multipolev circuit When applied to the control of reliable in its 1 mediate the ends of each compartment.
  • Conductor bars secured to the base so as to reinforce the same extend from the opposite ends of each compartment to the crosswall and a movable bridging member is arranged to span the crosswall for controlling the main circuit through each pole of the circuit breaker.
  • Each bridging member carries an arcing contact arranged to provide an intermediate shunt circuit therefor, and each pole circuit of the circuit breaker includesan arc extinguishing device of the compression chamber type, the relatively reciprocal contacts of which are connected in parallel circuit relation with the bridging member and the intermediate shunt circuit When the circuit breaker is in closed circuit position.
  • a manually and automatically operable mechanism is also provided, which is arranged to operate all of the bridging members, the intermediate shunt contacts and the reciprocal contacts between open and closed circuit positions in-predetermined sequence to prevent arcing at the main bridging contacts and to cause the nal circuit-breaking action to take place within4 the explosion-proof compression chamber.
  • FIG. 1 is a plan view of a circuit breaker embodying my invention, the cover of the circuit breaker and certain parts thereof being removed to show the Aoperating mechanism;
  • Fig. 2 is a sectional view taken along line -2-2 of Fig. 1;
  • Fig. 3 is a detailed sectional view taken along line 3-3 of Fig. 2;
  • Fig. 4 is a plan view of theinsulating support shown in Fig. 3 with the compression chamber removed; Figs.
  • 5 and 6 are-frag mentary sectional views of the operating mecha- .nism of the circuit breaker in diierent operating and with aplurality of intermediate walls I2, I3 and I4 arranged to forma plurality of conductor receiving compartments extendingA lengthwise of the base.
  • Each of the walls I2 extends from the uppermost end of the circuit breaker as viewed in Figs,l 1 and 2, to a point adjacent one of a pair ofbearing blocks I5, the purpose of which will be' fully set forth later; each of the walls I 3v extends from one of the bearing blocks I5 to a vpoint adjacent a unitary trip device indicated generally by the reference numeral I6, and each of the walls I4 extends from the lowermost end of the circuit breaker to a point adjacent the other eide of the trip device ls.
  • the trip device I6 includes a subbase I1 provided with a pair of walls I8 arranged substantially in alignment with the walls I3 and I4.
  • each conductor receiving compartment I provide a crosswall I9 formed integrally with the base I6.
  • Each conductor 'receiving compartment is provided at its opposite ends with the terminal members 20 and 2I respectively and the arrangement of the conductor members and the circuit controlling contacts for completing an electric circuit therebetween being the same in each compartment, only one such arrangement Willbe described.
  • a conductor bar 22 which is rigidly fastenedto the base IU in any suitable manner, as by the screws 23 adjacent the opposite ends thereof, and connected to the terminal member 20 by a bolt 24.
  • a second conductor bar 25 Disposed on the opposite side of the crosswall I9 and extending therefrom along the base I0 to the trip device I6, is a second conductor bar 25 also rigidly fastened to the base, as by the screws 26 and 26a adjacent the opposite ends thereof.
  • the' trip device I6 includes a pair of conductors 21 and 28 which are respectively connected to one end of the conductor bar 25 by the screw 26al and to the terminal 2I by a bolt 29.
  • the respective ends of the conductor bars 22 and 25 which are disposed adjacent the cross-wall I9 are provided with contact portions 30, and a movable bridging member 3
  • the main current circuit for each pole of the circuit breaker extends from one of the terminals 2U through one of the conductor bars 22, the associatedv bridging member 3
  • Each of the bridging members nests within the legs of a U-shaped carrier 33 formed on one arm of a bifurcated lever 34, and is supported by a bolt 35 extending therethrough, a plurality of springs v36 being arranged in aligned recesses in the bridging member and the carrier to provide uniform contact pressure.
  • each bridging member is provided with an arcing tip or contact 31 secured to one end of a conducting spring 38 mounted in a slot 39 in the carrier 33 and secured thereto by a rivet 40.
  • the end of the spring 38, remote' from the tip 31 is electrically connected to the conductor bar 25, and the tip 31is arranged to engage the conductor bar 22 to provide a shunt circuit around the bridging member 3 I, the conductingspring 38 beingfarranged -so that when the bifurcated lever 34 is operated to move the vbridging member to its open circuit position, the tip 31 will not be disengaged from the conductor bar 22 until after the contacts 30 and 32 have each pole of the circuit breaker is provided with an arc extinguishing device connected in parallel circuit relation with the bridging member 3
  • this arc extinguishing device may be described as comprising a cylinder 4I which forms the body portion of a compression chamber and which is secured in any ,suitable mannen'as by the screws 42 (Figs. 3 and 4), to an insulating support 43 which is fastened to the y conductor bar 22 by a plurality of screws 44.
  • a cylindricalA liner 45 of kerosene-free fiber surrounding a xed contact 46 and a reciprocal contact 41.
  • the fixed contact 46' is electrically connected to the conductor bar 22 by means of an L-shaped conductor 48, one leg of which is rigidly fastened to thel conductor 22, and the xed contact 46 is insulated from the cylinder 4I by a plurality of insulating bushings 49 and 56 and an insulating washer 5I.
  • the movable contact -end of the cylinder 4I is provided with a cylindrical cap 56 Which threadedly engages the cylinder 4I and is provided with a sealing gasket 51.
  • a plug 58 Supported by the cap 56, is a plug 58 in which the movable contact 41 is slidably journaled and which is provided with a 'skirt portion 59 for directingsuch gases, if any,
  • the bridging member circuit, the intermediate shunt circuit and the compression chamber circuit arelidentical in ⁇ each conductor receiving compartment of the circuit breaker and in order that all of the poles of the circuit breaker mayV be simultaneously opy. erated ⁇ by a single operating mechanism, I pro-l vide an insulated crossbar 88 which extends across the three poles of the circuit breaker and is journaled in the before-mentioned bearing blocks I5.
  • Each of the .bifurcated members 34 is provided with a clamping portion 69 which' encircles t-he crossbar 68 and is tightly clampedthereto by means of screws 10.
  • this operating mechanism comprises a U-shaped frame 1
  • an operating element 13 Pivotally mounted on a pin 12 carried by the frame 1
  • a, pair of overcenter spring devices each of which comprises a U- shaped member 19 pivotally connected to the ⁇ pin 18, and a yoke member 80 pivotally engaging one of the extending portions 11.
  • which are supported by the yoke 88, slidably extend through apertures in the' end of the U-shaped member 19 and carry a bearing plate 82 nested "between'the legs of the' member 19.
  • is surrounded by a compression spring 83 the opposite ends'of which respectively bear againstI the end of the U-shaped mem- Iber 19 and the plate 82. It will be observed that the plate 82 is guided by the legs of the member 19 and that the compression springs 83, which are arrangedvto resist relativel move- In heavy duty circuit breakers of this type, the operating mechanism should be arranged to proy vide a contact pressure of considerable magnitude'at the end of the closing stroke and accordi ingly, I prefer to employ an operating mecha- 5 nism of the general ytype described and claimed in a copending application of Charles H. Hill, Serial No. 18,127, illed April 25, 1935,' which application is assigned to the same assignee as the present invention. ⁇ l0
  • 'I'his operating mechanism in the embodiment here shown includes in addition to the operating element 13 and the overcenter spring devices, a
  • pair of spaced parallel arms 84 pivoted on the -ing the above-mentioned operating pin 18, the44 yrespective endsi of which extend through slots t 86 in the frame 1
  • a .toggle Connectedbetween the operating pin 18 and one of the bifurcated opverating levers 34 is a .toggle comprising a linkL 81, one end *of which engages the bifurcated' lever 34 and the other .end of which .is pivotedy 25 to a second link 88 which is pivotally supported onta pin 89 and provided witha slot 90 through which the operating pin 18 extends.
  • the link 88 as shown is a.
  • substantially triangular or three-point link and acts as a crank to make 30 and break the. toggle when the operating pin ⁇ 18 is moved bythe overcenter spring devices.I
  • the circuit breaker is shown in the closed circuit position, and it will be apparent that when the Aoperating handle 14 is moved downwardly to its lowermost positiorr in a di-'40 crank lever 88 about .its pivot 89 to break theM toggle and movethe crossbar 68. and the circuit ⁇ breaker contacts connected thereto to open circuit position.
  • the circuit breaker may 50 be vclosed by moving the operating handle 14Min a direction away from ⁇ the trip 7device I8 toits uppermost, position, the overcenter spring devices being eiective 'whenv carried overcenter thereby to operate the crank lever 88 to the closed 55 circuit position shown in Fig. 2.
  • the circuit breaker is also adapted for automatic operation to open the circuit upon the occurrence of ⁇ predetermined abnormal ⁇ current conditionsand accordingly, the operating mech- 60 anism is provided with a pivoted tripping member 9
  • the Itrip device I 6 includes alatchI 93 arranged 65 normally toengage a latch linger 94 carried by one end of the tripping member 9
  • is provided with a pin .95, each extending end of which carrlesa bearing plate 96 arranged to engage one end of oneplungers and springs maybe employed to bta'inx'of the tripping springs 9.2. the opposite ends ,of
  • Each bearing plate 96 carries aguide rod 98 which extends through the associated tripping spring 92 into a hole 99 which extends through the conductor bar 25 and intov ⁇ A circuit breaker, sho-wn in Fig. 2, it will Ybe seen 'A that the cross member 85 which extends between the parallel arms 84 is engaged by an extending portion
  • the latch 93 of the trip device I6 Upon the occurrence of abnormal current conditions, the latch 93 of the trip device I6 will be moved in a manner to be fully described, to release the latch finger 94 whereupon the tripping springs 92 will quickly move the tripping member 9
  • Any suitable trip device may be provided for rcleasably latching the tripping member 9i in itsnormal position against the bias vexerted by the tripping springs 92 and for releasing the tripping member upon the occurrence of abnormal current conditions.y
  • the force exerted by the tripping springs '92 is of considerable magnitude and accordinglyl prefer to use a rugged trip device of the type described and claimed in a copending application of John L. Lappin Serial No. 4,659, filed February 2, 1935, entitled Circuit breakers which application is assigned to the same assignee as the present invention.
  • This trip device which has been previously referred to as including the subbase il and the spaced walls i8, may be described for the purposes of the present application as comprising a frame supported centrally of the subbase ll having a pair of spaced walls
  • 04' carries the previously referred to latch 93, and the yoke portion of the U-shaped impact member M16 is overturned to provide a striking surface i06a for engaging a ⁇ portion of the latch plate to impart a hammerlike lblow thereto.
  • 06 carries a pin H0 extending through a slot in one of the supporting walls
  • 06 ' is normally held in the position shownin Fig. 2 by a pivoted trip bar
  • circuit breaker and is normally biased by the spring 3 into engagement with a finger
  • each thermal device Associated with the conductors in each conductor receiving compartment of the circuit break- 5 er are a thermal and a magnetic device for moving the trip bar
  • Each thermal device comprises a bimetallic element
  • 5 isarranged adjacent an adjustable insulatingbutton and adapted to engage the button to move the trip bar I2 about its pivot upon the occurrence of an overload current of suflicient magnitude and duration to ex the bimetallic element.
  • Each of the magnetic devices comprises a U- shaped magnetic member
  • lv Arranged adjacent the U-shaped magnetic members
  • 2 will be move-d either by the thermal or by the magnetic means, depending upon the character of ⁇ the abnormal condition, to release the impact member
  • is moved to tripping position by the tripping springs 92, the U- shaped reset member
  • a circuit breaker comprising a base formed 60 of molded insulation material having wall portions extending substantially the lengththereof to form a conductor receiving compartment, a crosswall intermediate the ends of said compartment, terminal members adjacent the respective ends of said compartment, rigid conductor bars arranged in said compartment extending along said base from each of said terminal members to said crosswall, means for securing said conductor bars to said base to reinforce the same, a movable bridging member for spanning 4said crosswall,
  • said bridging member cooperating with the ends of said. conductor bars -adjacent said crosswall tion, and means for moving said bridging mem-y ber between open and closed circuit positions.
  • a circuit breaker comprising a base formed o f molded insulation material having wall portions extending substantially the length thereof to form a conductor receiving compartment, a crosswall intermediate the ends of said compartment, ⁇ terminal members adjacent the respective ends ofsaid compartment, rigid conductor bars arranged in said compartment fastened to said base and extending therealong from each of said terminal members to said crosswall, the strength and rigidity of said conductor bars serving to reinforce said base throughout substantially the entire length of the base, fixed contact members carried by said conductor bars adjacent said crosswall, a bridging member spanning said cross- Wall movable between open and closed circuit positions, contact portions carried b y said bridging member arranged to engage said fixed contacts when said bridging member is in closed ⁇ circuit position, and means for moving said bridging -member between said open and closed circuit positions.
  • a multipole circuit breaker comprising a base having a plurality of wall portions extending lengthwise thereof to form individual pole compartmentsand a cross wall intermediate the ends yof each compartment, terminal members adjacent the respective'ends of each compartment,
  • a multipole circuit breaker comprising a base having ay plurality of wall portions extend- V' ing lengthwise thereof to form individual conductor receiving compartments and a crosswall intermediate theends of each compartment, ter ⁇ minal members supported adjacent the respective ends of each compartment, rigid conductor barsl arrange in each compartment extending along said b e from each of said terminal members to said crosswall, means for securing said conductor bars to said base to reinforce the same throughout substantially the entire length thereof, xed contact members carried by' said conductor bars adjacent said crosswall, a movable bridging member disposed in each of said compartments spanning said crosswalls, each of said bridging members carrying contacts arranged to cooperate with a pair of said fixed contacts to complete a circuit between said terminals in each compartment, and operating means for moving all of said bridging members between open and closed circuit posi-l tions.
  • a cir'cuit breaker comprising a base. having wall portions extending substantially the length thereof to form a conductor receiving compartment, a crosswall intermediate the ends of said tion, a compression-chamber, arc-extinguishing device provided with a pair of relatively reciprocal contacts, circuit connections for connecting said reciprocal contacts in parallel circuit relation with said bridging member, and means for operating said reciprocal contacts and said bridging member between .open and closed circuit positions in predetermined sequence whereby 'the iinal circuit-breaking action occurs in said arc-extinguishing device.
  • a circuit breaker comprising a base having Wall portions extending substantially the length thereof to form a conductor receiving compartment, a crosswall intermediate the ends of said compartment, terminal members adjacent the respective ends of said compartment, conductor bars arranged in said compartment extending along saidv base from each of said terminal members to said c rosswall,v a bridging member spanning said crosswall and -movable between open and closed circuit positions, said bridging member cooperating withthe ends of ⁇ said conductor bars adjacent said crosswall to complete an electric circuit between said 'terminals when saidbridg'- ing member is vin said closed circuit position, means including a contact resiliently supported from said bridging member and engageable with one o f said conductor bars when said bridging member is in said closed circuit position for establishing ashunt circuit about said bridging member, said resiliently supported contact being y arranged to maintain said shunt circuit until after said bridging member is moved out of cooperating relation with said conductor bars, a compression-chamber, arc-extinguishing device
  • a circuit breaker comprising a base having wall portions extending substantially the length ⁇ thereof to form-a conductor receiving compart- ⁇ l"ment, a crosswall intermediate the ends of said compartment, terminal members adjacent the respective ends of said compartment, ⁇ conductor bars arranged in said compartment extending along ".said base from each of said terminal.
  • a bridging member spanning said crosswall and movable between Y open and'closed circuit positions, said bridging member cooperating with the ends of said conductor' bars adjacent said crosswall to complete an electric circuit between said terminals when said bridging member is in -said closed circuit position, an arc-extinguishing chamber insulatedly supported on one of said conductor bars,
  • a crosswall intermediate the ends of said bars, an arc-extinguishing chamber insulatedly compartment, terminal members adjacent the respective ends of 'said compartment, conductor bars arranged in said compartment extending along said base from each of said terminal mem bers to said crosswall, a bridging member spanning said crosswall and movable betweenopen and ⁇ closed circuit positions, said bridging member cooperating ⁇ with the ends of said conductor barsadjacent saidl crosswall -to complete an electric circuit Ybetweensaid terminals when said bridging" member is in said closed circuit position, means including a contact4 resiliently supported from said bridging member and engageable with oneY of said conductor bars when said bridging member is in said closed circuit position for ⁇ establishing a shunt -circuit about said bridging member, said resiliently supported contact being arranged to maintain said shunt circuit until aiter said bridging member is moved out of cooperating relation with said conductor supported on one of said conductor bars, a
  • a multipole circuit breaker comprising a base having a plurality of wall portions extending lengthwise thereof to form individual pole compartments and a crosswall intermediate the ends of each compartment,y terminal members adjacent the respective ends of each compartment, conductor bars arranged in each compartment extending along said base from each of said terminal members to said crosswall, movable bridging members disposed in said compartments for spanning said crosswall, each of said bridging Vmembers being arranged to cooperate withra pair of said conductor bars adjacent saidcrosswall to complete a circuit' between said terminalsjin each compartment when said bridging members are'in one position, arcextinguishing chambersdisposed in each compartment, a pair of relatively reciprocal contacts associated with each of said chambers;
  • a multipole circuit breaker comprising a base having a plurality of wall portions extending lengthwise thereof to form individual pole compartments and a crosswall intermediate the ends of each compartment, terminal members adjacent. the respective ends of each compartment, conductor bars arranged in each compartment extending along said basey from each of said terminal members to said crosswall, movable bridging members disposed in said compartments for spanning said crosswall, each of said bridging members being arranged to cooperate with a pair of said conductor bars adjacent said crosswallr to complete a circuit between said terminals in each said bridging members are in 20- compartment when one position, arc-extinguishing chambers disposed in said compartments and insulatedly supported adjacent said conductor bars, each of said chambers ,containing a fixed contact electrically connected to a conductor bar and a reciprocal 25 contact extending through a wall thereof, each of said reciprocal contacts being electrically con- ⁇ rnected to another conductor bar to form a shunt circuit in each compartment in parallel circuit relation with said bridging members
  • an operating mechanism therefor comprising a movable voperating member, overcenter spring means for operating said contact between two positions with a snap action when said operating member is moved relative thereto comprising a pair of relatively movable members respectively operatively connected to said operating member and to said' movable contact, one of said members comprising a frame and the other of said members comprising a yoke, a plurality of said plate.
  • an operating mechanism therefor comprising a pivoted operating member, overcenter spring means for ⁇ operating said contact between two positions with a snap action when said operating .member is moved about its pivot comprising a pair of relatively movable members respectively operatively connected to said operating member and to said contact, one of said members comprising a U-shaped frame and the other of said members comprising a yokeJ a plurality of spaced parallel plungers ⁇ carried by said yoke slidably journaled in the end of said U-shaped frame, a plate carried by the portions of said plungers within said U-shaped U-shaped frame serving as Iguides for said plate, and compression spring means disposed'about said plungers between said plate and said end of said U-shaped frame.

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  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US18138A 1935-04-25 1935-04-25 Circuit breaker Expired - Lifetime US2047816A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US18127A US2047824A (en) 1935-04-25 1935-04-25 Circuit breaker
US18138A US2047816A (en) 1935-04-25 1935-04-25 Circuit breaker
DEA79199D DE723326C (de) 1935-04-25 1936-04-25 Elektrischer Schalter fuer hohe Stromstaerken mit UEberstromausloesung
GB11936/36A GB462790A (en) 1935-04-25 1936-04-27 Improvements in and relating to electric circuit breakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18138A US2047816A (en) 1935-04-25 1935-04-25 Circuit breaker

Publications (1)

Publication Number Publication Date
US2047816A true US2047816A (en) 1936-07-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US18138A Expired - Lifetime US2047816A (en) 1935-04-25 1935-04-25 Circuit breaker

Country Status (3)

Country Link
US (1) US2047816A (de)
DE (1) DE723326C (de)
GB (1) GB462790A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179768A (en) * 1962-05-03 1965-04-20 Gen Electric Circuit breaker with mechanically isolated trip mechanism
FR2654550A1 (fr) * 1987-04-23 1991-05-17 Gen Electric Procede de montage d'un disjoncteur en boitier moule.
CN109285735A (zh) * 2018-10-25 2019-01-29 嘉兴弘博电气有限公司 具有互联通信口桥接结构的智能空气开关

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179768A (en) * 1962-05-03 1965-04-20 Gen Electric Circuit breaker with mechanically isolated trip mechanism
FR2654550A1 (fr) * 1987-04-23 1991-05-17 Gen Electric Procede de montage d'un disjoncteur en boitier moule.
CN109285735A (zh) * 2018-10-25 2019-01-29 嘉兴弘博电气有限公司 具有互联通信口桥接结构的智能空气开关
CN109285735B (zh) * 2018-10-25 2023-11-21 嘉兴弘博电气有限公司 具有互联通信口桥接结构的智能空气开关

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Publication number Publication date
DE723326C (de) 1942-08-03
GB462790A (en) 1937-03-16

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