US2551303A - Automatic circuit breaker - Google Patents

Automatic circuit breaker Download PDF

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Publication number
US2551303A
US2551303A US632442A US63244245A US2551303A US 2551303 A US2551303 A US 2551303A US 632442 A US632442 A US 632442A US 63244245 A US63244245 A US 63244245A US 2551303 A US2551303 A US 2551303A
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US
United States
Prior art keywords
armature
movable contact
spring
contact
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
US632442A
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English (en)
Inventor
Theunissen Francois Jean Marie
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2551303A publication Critical patent/US2551303A/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
    • 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
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • 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
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • My invention relates to circuit-breakers.
  • My copcnding patent application No. 632,441 filed December 3, 1945 concerns an automatic circuit breaker provided with an electro-magnet through which the current passes, and the movable armature of which actuates means for liberating (by pawl, toggle, etc.) the movable contact, when an overload current sufficient to attract the said armature passes through the apparatus, said circuit breaker being essentially characterised by the fact that the said movable armature acts directly on the movable contact, independently of the liberating means actuated by said armature.
  • the present improvements relate to modifications and improvements in the said circuit breaker, in particular for the purpose of further accelerating the opening of the circuit in case of a very heavy overload or of a short-circuit.
  • One of said improvements consists in that the electro-magnet is provided with an auxiliary armature which acts positively on the movable contact, independently of the main armature and as soon as the movable contact has been released by the liberating means by the action of th electro-magnet.
  • the auxiliary armature is advantageously formed by a part of the member serving to transmit the impulse of the main armature to the movable contact, which member can act on the support of the movable contact or can itself form the support of the movable contact.
  • the main armature can, in particular, be slidably mounted about the said member which is provided with a stop on which the main armature is adapted to act after having released the liberating means.
  • this auxiliary armature has enabled the speed of opening of the circuit to be further increased, since said auxiliary armature is directly afiected by the magnetic flux which should cause the release, and since it is therefore ready to act immediately on the movable contact, as soon as the latter is released, so that the auxiliary armature imparts without any delay a considerable acceleration to the movable contact. If said movable contact had any tendency to adhere to the fixed contact, it would be sharply pulled away from same by the subsequent direct action of the main armature on the movable contact or its support.
  • Figures 1, 2 and 4 show three variants of construction of a circuit breaker according to the invention, in the position in which the current flows, and
  • Figures 3 and 5 show partial views of the circuit breakers according to Figures 2 and 4, immediately after tripping.
  • the movable contact 2 is carried by a beam 3 pivoting about a fixed point 3a and subjected, at 31) to the action of a spring 4 which is attached to a second beam 5 pivoting about the fixed point 5a.
  • the arrangement is such that, in the engaged position illustrated in the drawing, the line of action of the spring 4 passes between the points 3a and 5a and presses the contact 2 against the fixed contact 6.
  • the beam 5 is held in this position by a pawl I, which can be actuated through the intermediary of an arm [0, against the action of a spring la.
  • the current flows through the beam 3, the contacts 2, 6, the tripping coil 9 and a time relay formed by a bimetallic strip 8.
  • said strip acts on the arm III which releases the pawl I and enables the beam -5 to move in the direction of the arrow X by the action of the spring 6 until it contacts a suitable stop 52) and the line of action of said spring passes over to the other side of the point 3a. From this moment, the spring 4 acts to move the beam 3 and the contact 2 quickly, so as to open the circuit.
  • the coil 9 has a main movable armature formed by a core ll adapted to slide about a push rod which bears on the beam 3 and the part l2 of which is in contact with said beam and is made of non-magnetic material, whereas it part
  • 2b is constructed of magnetic material, for example of mild steel, and forms an auxiliary armature of the magnetic relay.
  • the armature H moves against the action of its weak retracting spring I3 until a rod [4, which is secured to said armature ll, abuts against the arm I0 and releases the pawl l, releasing the contact 2 through the liberating mean hereinbefore described.
  • the auxiliary armature 12b being directly affected by the magnetic flux which should cause the tripping, transmits its impulse through the rod [2 to the beam 3 and imparts a considerable acceleration to the movable contact 2, as
  • the main armature ll continues its travel and acts on the rod l2 through the intermediary of the shoulder lZa, so as to add its impulse to that of the auxiliary armature l2b, thereby ensuring in particular the opening of the circuit if the movable contact 2 had a tendency to adhere to the movable contact 6.
  • the pawl 28 is pivoted at 29 to a connecting link 35 which is pivoted at its other end on a bell-crank lever 36 which can swing about the fixed point 31 and the other end of which is provided with an elongated slot 38 in which is engaged a setting knob 39.
  • This knob is depressed in order to bring the circuit breaker back to the positions shown in Figures 2 and 4 after disappearance of the current defects which had brought it to the positions shown in Figures 3 and 5.
  • the movable contact is advantageously constructed in the form 'of a bridge 22 which is pivoted with limited play on the head 26a of the rod 26, and with a stiff fit on its pivot 50. Owing to thi articulation, the pressure is balanced on the two fixed contacts, when the circuit is closed, and owing to the stiff fit on the pivot 50, the movable contact retains, when the circuit i opened, the position in which the separation of the contacts takes place simultaneously at the contacts 20 and 2
  • An automatic circuit breaker comprising a fixed contact, a movable contact, means normally resiliently urging the movable contact against the fixed contact, releasable spring-actuated means tending to open the movable contact, look-- ing means for restraining the spring actuated means, an electromagnet through which the circuit current flows, an unlocking member operatively connected to said locking means, actuating means responsive to said electro-magnet for actuating said unlocking member and freeing the spring actuated means in response to a heavy overload current flowing through said electromagnet, a principal movable armature for cooperating with said electro-magnet under the action of said overload current, a member directly operatively connected to the movable contact and provided with means arranged in the path of movement described by the principal armature whereby the member is operated by said armature after the unlocking of the movable contact, and an auxiliary movable armature cooperating with the electro-magnet and operatively connected to the said member for separately and directly acting upon
  • An automatic circuit breaker comprising a fixed contact, a movable contact, means for normally holding closed the movable contact on the fixed contact, releasable means for displacing the movable contact in response to an overload in the circuit, an electromagnet through which a circuit current flows, said displacing means including an operating member connected to the movable contact, a main movable armature actua'table by the electromagnet in response to a heavy overload and provided with means for acting upon said member during the movement of the member, and an auxiliary armature, actuatable by the electromagnet in response to a heavy overload, separately and directly acting upon said member as soon as the displacing means has been released.
  • An automatic circuit breaker according to claim 2 including connections whereby the releasable means for displacing the movable contact is operated by said main movable armature.
  • An automatic circuit breaker as claimed in claim 2 including a second fixed contact, said movable contact being arranged to bridge said fixed contacts, one of said fixed contacts being electrically connected to said electromagnet and the other to the circuit line, said movable contact including a bridging member lightly, frictionally held against rotation on said operating member.
  • An automatic circuit breaker comprising a fixed contact, a movable contact, means for normally holding closed the movable contact on the fixed contact, releasable means for displacing the movable contact in response to an overload in the circuit, an electromagnet through which the current flows, said displacing means including an operating member itself comprising a rod connected to and adapted to actuate said movable contact, an abutment on said rod, a main movable armature actuatable by the electromagnet in response to a heavy overload being slidably mounted on said rod and arranged to act on said abutment when attracted by said electromagnet after the release operation of said displacing means, and an auxiliary armature constituting a part of said rod and actuatable by the electromagnet in response to a heavy overload, separately and directly acting upon said member as soon as the displacing means has been released.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
US632442A 1940-04-23 1945-12-03 Automatic circuit breaker Expired - Lifetime US2551303A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR256667X 1940-04-23
BE2551303X 1944-10-17

Publications (1)

Publication Number Publication Date
US2551303A true US2551303A (en) 1951-05-01

Family

ID=32231636

Family Applications (2)

Application Number Title Priority Date Filing Date
US632442A Expired - Lifetime US2551303A (en) 1940-04-23 1945-12-03 Automatic circuit breaker
US632441A Expired - Lifetime US2551302A (en) 1940-04-23 1945-12-03 Automatic circuit breaker

Family Applications After (1)

Application Number Title Priority Date Filing Date
US632441A Expired - Lifetime US2551302A (en) 1940-04-23 1945-12-03 Automatic circuit breaker

Country Status (6)

Country Link
US (2) US2551303A (cs)
BE (2) BE457696A (cs)
CH (1) CH256667A (cs)
FR (2) FR866592A (cs)
GB (2) GB599407A (cs)
NL (3) NL119357B (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594668A (en) * 1970-01-02 1971-07-20 Texas Instruments Inc Remote control circuit breaker
US3651436A (en) * 1970-01-02 1972-03-21 Texas Instruments Inc Circuit breaker
US3914720A (en) * 1973-09-27 1975-10-21 Siemens Ag Automatic protective circuit breaker

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE441207A (cs) * 1940-04-23
DE1071821B (cs) * 1955-04-06 1959-12-24
DE1282777B (de) * 1965-08-12 1968-11-14 Siemens Ag Einrichtung zur unmittelbaren Kontakttrennung bei grossen UEberstroemen fuer Selbstschalter
FR2123188B1 (cs) * 1971-01-28 1976-05-28 Teco
JPS60189134A (ja) * 1984-03-09 1985-09-26 寺崎電気産業株式会社 回路遮断器
NL8703170A (nl) * 1987-12-31 1989-07-17 Holec Syst & Componenten Elektromagnetische schakelaar.
FR2711271B1 (fr) * 1993-10-15 1995-12-22 Merlin Gerin Appareillage de protection formé par l'association d'un disjoncteur en série avec un effecteur.
DK1671604T3 (da) * 1996-12-10 2009-11-09 Purdue Research Foundation Ventil af syntetisk væv

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE297184C (cs) *
US585030A (en) * 1897-06-22 harrington
US1330094A (en) * 1916-07-29 1920-02-10 Cutler Hammer Mfg Co Circuit-breaker
DE342143C (de) * 1919-08-08 1921-10-13 Krupp Ag UEberstromschalter mit zwei im magnetischen Kreise hintereinander geschalteten, je fuer sich beweglichen Magnetteilen
US1433952A (en) * 1920-10-28 1922-10-31 Regan Safety Devices Co Inc Locking device for relay armatures
US2072163A (en) * 1934-11-07 1937-03-02 Bulldog Electric Prod Co Circuit controlling means
FR866592A (fr) * 1940-04-23 1941-08-20 Teco Sa Disjoncteur
US2336871A (en) * 1942-02-28 1943-12-14 Gen Electric Electric switch

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726233A (en) * 1924-11-26 1929-08-27 Westinghouse Electric & Mfg Co Motor-starting switch
US1989497A (en) * 1930-03-20 1935-01-29 Ite Circuit Breaker Ltd Circuit breaker
US2027238A (en) * 1930-11-26 1936-01-07 Westinghouse Electric & Mfg Co Circuit breaker
US2329362A (en) * 1934-04-14 1943-09-14 Westinghouse Electric & Mfg Co Circuit breaker
US2345105A (en) * 1941-05-09 1944-03-28 Westinghouse Electric & Mfg Co Circuit breaker
US2360684A (en) * 1941-10-30 1944-10-17 Westinghouse Electric & Mfg Co Circuit breaker
US2370024A (en) * 1942-07-28 1945-02-20 Westinghouse Electric & Mfg Co Circuit breaker

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE297184C (cs) *
US585030A (en) * 1897-06-22 harrington
US1330094A (en) * 1916-07-29 1920-02-10 Cutler Hammer Mfg Co Circuit-breaker
DE342143C (de) * 1919-08-08 1921-10-13 Krupp Ag UEberstromschalter mit zwei im magnetischen Kreise hintereinander geschalteten, je fuer sich beweglichen Magnetteilen
US1433952A (en) * 1920-10-28 1922-10-31 Regan Safety Devices Co Inc Locking device for relay armatures
US2072163A (en) * 1934-11-07 1937-03-02 Bulldog Electric Prod Co Circuit controlling means
FR866592A (fr) * 1940-04-23 1941-08-20 Teco Sa Disjoncteur
US2336871A (en) * 1942-02-28 1943-12-14 Gen Electric Electric switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594668A (en) * 1970-01-02 1971-07-20 Texas Instruments Inc Remote control circuit breaker
US3651436A (en) * 1970-01-02 1972-03-21 Texas Instruments Inc Circuit breaker
US3914720A (en) * 1973-09-27 1975-10-21 Siemens Ag Automatic protective circuit breaker

Also Published As

Publication number Publication date
NL73337C (cs)
GB599407A (en) 1948-03-11
US2551302A (en) 1951-05-01
NL119357B (cs)
FR54180E (fr) 1948-04-21
FR866592A (fr) 1941-08-20
BE457696A (cs)
CH256667A (fr) 1948-08-31
NL76843C (cs)
GB600421A (en) 1948-04-08
BE441207A (cs)

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