US3689855A - Circuit protector - Google Patents

Circuit protector Download PDF

Info

Publication number
US3689855A
US3689855A US136416A US3689855DA US3689855A US 3689855 A US3689855 A US 3689855A US 136416 A US136416 A US 136416A US 3689855D A US3689855D A US 3689855DA US 3689855 A US3689855 A US 3689855A
Authority
US
United States
Prior art keywords
plunger
pole member
armature
yoke
coil
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
US136416A
Other languages
English (en)
Inventor
Isami Setone
Akira Yoshino
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3689855A publication Critical patent/US3689855A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/34—Electromagnetic mechanisms having two or more armatures controlled by a common winding
    • H01H71/345—Electromagnetic mechanisms having two or more armatures controlled by a common winding having a delayed movable core and a movable armature

Definitions

  • an oil- Apnl 27, 1970 Japan ..45/36138 dash yp plunger provided within said cylinder movably against a compression force of a spring ar- (g1 3356;251:5352 ranged between a cylinder head and the plunger a y integrally connected to Said cylinder and the [58] Field of Search ..335/63, 62, 61, 236 bobbin, and an armature mounted to an end of said yoke in a manner capable of being attracted to the [56] Refimces Cited plunger head, said bobbin is provided with a magnetic UNITED STATES PATENTS leakage in the vicinity to the cylinder head. r
  • CIRCUIT PROTECTOR This invention relates to a circuit protector.
  • the transformer or solenoid allows such a great overcurrent as 1,500 3,000 percent of rating current to flow temporarily at the starting moment.
  • the electromagnet device is actuated actuated by electromagnetic force produced only in the coil before the plunger moves due to the attraction and, thus, the circuit breaker itself is apt to operate before such overcurrent reaches stable region (or the starting current disappers).
  • the present invention has been proposed to remove the above drawback and is so constructed that the circuit protector is not actuated by the starting current but actuated by the overcurrent continuously flowing during operation by increasing magnetic leakage so as to increase attracting ampare turn of the armature and by minimizing the leakage at the time of completion of attraction of the plunger, so that the above problem will be effectively solved.
  • FIGS. 1A and 1B show the electromagnet device for use in the circuit protector according to the present invention and, in particular, FIG. 1A is a longitudinal cross section of the device and FIG. 1B is a cross sectional view taken along the line I I of FIG. 1A;
  • FIG. 2 is a partially sectioned elevation of the circuit protector according to the present invention, in which the electromagnet device of FIG. 1 is utilized;
  • FIG. 3 is an equivalent circuit
  • FIGS. 4 to 6 are explanatory diagrams for explaining the characteristics of the present device as compared with the conventional one.
  • FIGS. 1A and 1B show respectively only electromagnet devices to be used in the circuit protector according to the present invention
  • FIG. 1A is a sectional elevation
  • FIG. 1B is a sectional side view taken along the line I I of FIG. 1A.
  • a coil 1 is wound around a bobbin 2 made of insulation material within which a cylinder 3 made of nonmagnetic materials such as brass is disposed.
  • a plunger 4 is slidably arranged within the cylinder 3 with an oil filled therein.
  • a plunger head 5 made of magnetic material is provided at the head portion of the cylinder 3.
  • a compression spring 6 is arranged so as to engage between the plunger head 5 and a projection extending from the front face of the plunger 4.
  • the bobbin 2 is fixed to an L-shaped yoke 7 provided with an upper flange 9 and side flanges 8, through the latter of which the cylinder 3 penetrates.
  • 10 is a pair of upstanding bent portions of the yoke 7, with the electromagnet devide is secured to an insulative housing.
  • 11 and 11 are leakage magnetic paths arranged in the vicinity to the plunger head 5 and at opposite sides with respect to the cylinder 3 as inserted in a flange of the bobbin 2.
  • the upper ends of the leakage magnetic paths 11 and 1 1' are connected to the yoke 7.
  • An armature 12 is located in front of the plunger head 5 and is pivoted to the insulation housing 14 (See FIG. 2) at the upper portion thereof by'means of a shaft 15.
  • Another compression spring 13 is disposed between the armature 12 and the bobbin flange 8 at the armature side.
  • FIG. 2 illustrates an example of the circuit protector embodying the electromagnet device as shown in FIGS. 1A and 1B.
  • the armature 12 is rotatably secured through the shaft 15 to the housing 14 made of insulating material.
  • a hook 16 is rotatably coupled to the armature 12 at the shaft 15 and the right end of a seesaw type turning plate 17 is engageably provided above the hook 16.
  • the left end of the turning plate 17 is kept in contact with a sliding member 18 which slides up and down.
  • Slidably secured to a downward leg 19 of the sliding member 18 is a movable contactor 20.
  • 21 is a fixed contactor secured to the insulation housing 14 below the movable contactor 20. 22 indicates a spring engaged between the movable contactor 20 and the fixed contactor 21.
  • a push button is a push button.
  • 24 is a link, the upper end of which is rotatably secured to the push button 23 through a pin 27 and the lower end of which is also rotatably secured to the turning plate 17 through a pin 26.
  • 25 indicates a testing rod.
  • the pin 27 engaged to the lower portion of the push button 23 is likewise descended along an L- shaped slot 27' in the housing 14 and locked in its sideward bottom port and, thus, the contacts are maintained in their ON state.
  • the top portion of the armature 12 rotates clockwise and in turn the top portion of the hook 16 also rotates clockwise and is released from engagement with the right end of the turning plate 17.
  • the movable contactor 20 is urged upward by the force of the spring 22 and thus the contacts reach OFF state.
  • Depression of the testing rod 25 rotates the top portion of the armature l2 clockwise and the contacts are opened in the similar manner to the foregoing.
  • FIG. 3 shows an electric equivalent circuit in which the following references are used:
  • Rp Magnetic reluctance of the plunger and the plunger head.
  • Re Magnetic reluctance of the leakage circuit.
  • Ra Magnetic reluctance of the attraction gap of the armature.
  • FIG. 4 is a characteristic diagram showing the variation of the armature magnetic flux rim with respect to the change in plunger position, i.e., in the distance between the plunger and the plunger head, wherein curve A represents the case having no leakage circuit and curve B represents the case having the leakage circuit.
  • FIG. is a characteristic diagram showing the variation in the attractive force to which the armature is subjected with magnetomotive force fa, with respect to the armature gap, i.e., the change in distance between the armature and the plunger head, in which curves C and D represent the variations when plunger stroke from the head is zero in the cases without and with the leakage circuit, and curves E and F represent the variations when the stroke is mm. in the cases without and with the leakage circuit.
  • FIG. 6 is a characteristic diagram, in which the ab scissa indicates the variation of distance between the plunger and the head and the ordinate indicates magnification of current value at which the circuit protector operates with respect to the value of rating current,
  • curve G represents the case without the leakage circuit and curve H represents the case with the leakage circuit.
  • the contacts do not open at the starting current which is temporary overcurrent not enough to move the plunger 4, while the contacts close with the overcurrent occurring at the steady state lasting for a predetermined time period.
  • An electromagnetic circuit protector comprising the combination of an armature mounted for pivotal movement between first and second positions for opening a pair of electrical contacts to protect an electrical circuit, a magnetizable pole member located at said second position, a magnetizable plunger mounted for reciprocating movement in a non-magnetizable cylinder leading to said pole member, biasing means urging said plunger away from said pole member, a magnetizable yoke having one end located closely adjacent said plunger and a second end extending toward said armature and said pole member, a coil disposed around said cylinder for advancing said plunger toward said pole member against the urging of said biasing means when the coil is energized for a predetermined time interval, thereby attracting said armature to said pole member due to a first magnetic circuit formed by said yoke, plunger, pole member and armature, and magnetizable short circuiting means contacting said yoke and extending to a position proximate to said pole member and lying in substantially the same plane as said pole member
  • circuit protector according to claim 1 wherein said coil is wound on a flanged bobbin and said short circuiting means is disposed at both sides of the pole member in a flange of the coil bobbin.
  • circuit protector according to claim 1 wherein said yoke and armature are formed in an integral body member.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Breakers (AREA)
US136416A 1970-04-27 1971-04-22 Circuit protector Expired - Lifetime US3689855A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3613870 1970-04-27

Publications (1)

Publication Number Publication Date
US3689855A true US3689855A (en) 1972-09-05

Family

ID=12461411

Family Applications (1)

Application Number Title Priority Date Filing Date
US136416A Expired - Lifetime US3689855A (en) 1970-04-27 1971-04-22 Circuit protector

Country Status (5)

Country Link
US (1) US3689855A (enExample)
CA (1) CA944795A (enExample)
DE (1) DE2119901C3 (enExample)
FR (1) FR2086398B1 (enExample)
GB (1) GB1345783A (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959755A (en) * 1974-12-13 1976-05-25 Airpax Electronics Incorporated Circuit breaker with improved delay
US4173004A (en) * 1978-07-25 1979-10-30 Square D Company Magnetic latch device for a clapper type contactor
US4238749A (en) * 1978-12-29 1980-12-09 Texas Instruments Incorporated High inrush current circuit breaker
US4378541A (en) * 1979-11-30 1983-03-29 Matsushita Electric Works, Ltd. Time delay switch
US20100026430A1 (en) * 2008-07-31 2010-02-04 Moeller Gebaudeautomation Gmbh Switching device
CN118197872A (zh) * 2024-04-09 2024-06-14 上海格兆电器有限公司 一种线圈以及具有其的脱扣器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4504807A (en) * 1984-06-01 1985-03-12 Carlingswitch, Inc. High inrush current circuit breaker
ZA961068B (en) * 1995-02-20 1996-08-20 Circuit Breaker Ind A circuit breaker
GB2473013B (en) * 2009-08-27 2014-04-16 Sean Christopher Ganley Actuator health check

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1730688A (en) * 1927-07-14 1929-10-08 Clark Controller Co Magnetic switch
US1868256A (en) * 1929-05-11 1932-07-19 Clark Controller Co Tme limit overload switch
US3017475A (en) * 1959-08-04 1962-01-16 Heinemann Electric Co Relay structure
US3517357A (en) * 1968-04-04 1970-06-23 Heinemann Electric Co Electromagnetic device having a short circuited turn

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1469261A (fr) * 1965-01-13 1967-02-10 Heinemann Electric Co Disjoncteurs et relais à détection électro-magnétique des surcharges

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1730688A (en) * 1927-07-14 1929-10-08 Clark Controller Co Magnetic switch
US1868256A (en) * 1929-05-11 1932-07-19 Clark Controller Co Tme limit overload switch
US3017475A (en) * 1959-08-04 1962-01-16 Heinemann Electric Co Relay structure
US3517357A (en) * 1968-04-04 1970-06-23 Heinemann Electric Co Electromagnetic device having a short circuited turn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959755A (en) * 1974-12-13 1976-05-25 Airpax Electronics Incorporated Circuit breaker with improved delay
US4062052A (en) * 1974-12-13 1977-12-06 Airpax Electronics, Inc. Circuit breaker with improved delay
US4173004A (en) * 1978-07-25 1979-10-30 Square D Company Magnetic latch device for a clapper type contactor
WO1980000391A1 (en) * 1978-07-25 1980-03-06 Square D Co A magnetic latch device for a clapper type contactor
US4238749A (en) * 1978-12-29 1980-12-09 Texas Instruments Incorporated High inrush current circuit breaker
US4378541A (en) * 1979-11-30 1983-03-29 Matsushita Electric Works, Ltd. Time delay switch
US20100026430A1 (en) * 2008-07-31 2010-02-04 Moeller Gebaudeautomation Gmbh Switching device
CN118197872A (zh) * 2024-04-09 2024-06-14 上海格兆电器有限公司 一种线圈以及具有其的脱扣器

Also Published As

Publication number Publication date
DE2119901A1 (de) 1971-12-16
FR2086398B1 (enExample) 1976-04-16
DE2119901C3 (de) 1975-12-04
FR2086398A1 (enExample) 1971-12-31
GB1345783A (en) 1974-02-06
DE2119901B2 (de) 1973-03-22
CA944795A (en) 1974-04-02

Similar Documents

Publication Publication Date Title
US4329669A (en) Circuit breaker with auxiliary tripping unit
US3824508A (en) Electromagnetic repulsion device actuating the movable contact member of a circuit interrupter
US4604596A (en) Remotely controllable circuit breaker
JPS6258095B2 (enExample)
US2170694A (en) Electromagnetic switch and system therefor
US4947145A (en) Remote-controlled circuit breaker
US2569281A (en) Contact mechanism for automatic circuit breakers and similar electrical switchgear
US4042895A (en) Combination motor-starter and circuit breaker
US3373383A (en) Automatic current limiting circuit breaker
US2733312A (en) christensen
US2208387A (en) Switching device
US3238326A (en) Contactor with a load current hold-in feature
US2370024A (en) Circuit breaker
US3284743A (en) Magnetic switching device
GB712482A (en) Improvements in and relating to automatic electric circuit breakers
GB426999A (en) Improvements in electromagnetically-tripped automatic overload circuit-breakers
US3588765A (en) Electromagnetic relays
US2607868A (en) Circuit breaker
US3081387A (en) Circuit breaker
US3158711A (en) Current limiting circuit breaker
US3017475A (en) Relay structure
US1475166A (en) Overload-circuit breaker
US3244835A (en) Magnetic tripped circuit breaker
US3226507A (en) Circuit breaker having a permanent magnet made of curie point material
US2946875A (en) Electromagnetic relay