EP0385201A1 - Cycling bimetal circuit breaker - Google Patents

Cycling bimetal circuit breaker Download PDF

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Publication number
EP0385201A1
EP0385201A1 EP90103064A EP90103064A EP0385201A1 EP 0385201 A1 EP0385201 A1 EP 0385201A1 EP 90103064 A EP90103064 A EP 90103064A EP 90103064 A EP90103064 A EP 90103064A EP 0385201 A1 EP0385201 A1 EP 0385201A1
Authority
EP
European Patent Office
Prior art keywords
armature
compensator
circuit breaker
expansion layer
contact
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.)
Withdrawn
Application number
EP90103064A
Other languages
German (de)
English (en)
French (fr)
Inventor
George A. Ball, Jr.
John L. Schneider
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.)
Control Devices LLC
Original Assignee
GTE Products Corp
Control Devices LLC
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 GTE Products Corp, Control Devices LLC filed Critical GTE Products Corp
Publication of EP0385201A1 publication Critical patent/EP0385201A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
    • H01H81/02—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electrothermally operated
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/162—Electrothermal mechanisms with bimetal element with compensation for ambient temperature

Definitions

  • This invention concerns electrical circuit breakers of the type employing a positive make and break (PMB) bimetal.
  • PMB bimetal comprises a compensator fastened to a U shaped armature.
  • Example of such circuit breakers are disclosed in U.S. patents 2,585,068, 4,521,760, 4,636,766 and 4,663,606.
  • the compensator was always made narrower than the U shaped armature. See, for example, column 4, lines 65-68 of 2,585,068 and column 2, lines 12-16 of 4,521,760. Such an arrangement was satisfactory when the rated ambient temperature for the circuit breaker was not too high, say, 85 o C.
  • the compensator should be about the same width as the U shaped armature.
  • Fig. 1 is a plan view and Fig. 2 and 3 are front and side elevational views of one example of a circuit breaker in accordance with this invention.
  • the circuit breaker comprises a compensator 1 fastened, such as by welding, to a terminal 2 at one end, the other end of compensator 1 being fastened to a U shaped armature 3.
  • U shaped armature 3 has a shorter leg 4 and a longer leg 5.
  • Compensator 1 is fastened to the end of shorter leg 4.
  • Contact 6 is, during normal operation, in physical and electrical contact with a fixed contact 7 mounted on terminal 8.
  • the upper surface of compensator 1 is the low expansion layer of the bimetal and the lower surface is the high expansion metal.
  • the end of compensator 1 which is fastened to U shaped armature 3 tends to move upwards, thereby increasing contact pressure between contact 6 and contact 7.
  • the high expansion layer is the inner surface of the U and the low expansion layer is the outer surface.
  • the contact end of U shaped armature 3 tends to move downward, thereby decreasing contact pressure between contact 6 and contact 7.
  • the opening pressure of U shaped armature 3 overcomes the closing pressure of compensator 1, and contacts 6 and 7 separate, thereby opening the electrical circuit.
  • compensator 1 was 17 mils thick by 550 mils long by 218 mils wide.
  • U shaped armature 3 was 20 mils thick by 218 mils wide and had an overall length of 1121 mils.
  • the length of longer leg 5 was about 680 mils and the length of shorter leg 4 was about 420 mils.
  • Terminals 2 and 8 were embedded in and protruded through, a plastic base 9. The bottom portions of terminals 2 and 8 can be plugged into a suitable electrical receptacle.
  • this type of circuit breaker can be called a cycling circuit breaker.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
EP90103064A 1989-02-27 1990-02-16 Cycling bimetal circuit breaker Withdrawn EP0385201A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31566689A 1989-02-27 1989-02-27
US315666 1989-02-27

Publications (1)

Publication Number Publication Date
EP0385201A1 true EP0385201A1 (en) 1990-09-05

Family

ID=23225516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103064A Withdrawn EP0385201A1 (en) 1989-02-27 1990-02-16 Cycling bimetal circuit breaker

Country Status (2)

Country Link
EP (1) EP0385201A1 (enrdf_load_stackoverflow)
JP (1) JPH02115237U (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585068A (en) * 1947-02-28 1952-02-12 Morris B Wood Electrical circuit breaker
DE3046571A1 (de) * 1980-12-11 1982-07-15 Vdo Adolf Schindling Ag, 6000 Frankfurt Thermo-zeitschalter
US4521760A (en) * 1983-09-19 1985-06-04 Gte Products Corporation Miniaturized circuit breaker
US4636766A (en) * 1983-09-19 1987-01-13 Gte Products Corporation Miniaturized circuit breaker
US4663606A (en) * 1986-03-24 1987-05-05 Gte Products Corporation Bimetal circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0216257A (ja) * 1988-07-04 1990-01-19 Sekisui Chem Co Ltd 床板ユニット
JPH0742672Y2 (ja) * 1993-06-14 1995-10-04 株式会社名庄プレス ゴムの立型真空射出成形機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585068A (en) * 1947-02-28 1952-02-12 Morris B Wood Electrical circuit breaker
DE3046571A1 (de) * 1980-12-11 1982-07-15 Vdo Adolf Schindling Ag, 6000 Frankfurt Thermo-zeitschalter
US4521760A (en) * 1983-09-19 1985-06-04 Gte Products Corporation Miniaturized circuit breaker
US4636766A (en) * 1983-09-19 1987-01-13 Gte Products Corporation Miniaturized circuit breaker
US4663606A (en) * 1986-03-24 1987-05-05 Gte Products Corporation Bimetal circuit breaker

Also Published As

Publication number Publication date
JPH02115237U (enrdf_load_stackoverflow) 1990-09-14

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900216

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR IT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: GTE CONTROL DEVICES INCORPORATED

17Q First examination report despatched

Effective date: 19930719

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CONTROL DEVICES, INC.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19941110