US2551302A - Automatic circuit breaker - Google Patents
Automatic circuit breaker Download PDFInfo
- Publication number
- US2551302A US2551302A US632441A US63244145A US2551302A US 2551302 A US2551302 A US 2551302A US 632441 A US632441 A US 632441A US 63244145 A US63244145 A US 63244145A US 2551302 A US2551302 A US 2551302A
- Authority
- US
- United States
- Prior art keywords
- armature
- action
- spring
- movable contact
- movable
- 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
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
- H01H71/2409—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
- This invention relates to circuit-breakers having a magnetic relay or an instantaneously act-- ing release coil through which the current flowing through the circuit-breaker passes.
- the attraction of the movable armature of this coil efiects the liberation of a mechanical release system (by pawl, knuckle joint, etc.) rapidly driving the movable contact in the direction causing opening of the circuit.
- the time of disconnection of a circuit-breaker comprises the time of mechanical opening, that is to say, the time necessary to manipulate pawls and for the successive placing in motion of the different parts of the mechanism, up to the moment when the fixed and movable contacts commence to separate, and the time or" the electric breaking of the circuit, that is to say, the time necessary for the extinction of the are which strikes between the contacts on the commencement of their separation.
- the present invention has for its object to reduce the time of the mechanical opening of the circuit and this object is achieved by reducing or even eliminating all the successive movements, by causing the movable armature to act directly on the movable contact. It is well known that such arrangement considerably reduces the time taken by the mechanical breaking of the circuit, but they present the drawback of causing, at certain densities of the current, rapid vibrations of the movable contact which are of such a nature as to weld together the fixed and movable contacts. This is the case when the circuit-breaker is traversed by an alternating current the intensity of which approaches that necessary to cause the complete attraction of the movable armature.
- the movable armature acts following the principles of the invention, not only to free the releasable system of release comprising generally a spring tending to cause the opening of the contacts as soon as the release system is unlocked or “freed, but also it transmits its impulse directly to the movable contact (or its equivalent holder), independently of the system of release, in such manner that the efiort of attraction of the armature is added to the action of the release spring.
- action on the movable contact it must be understood that this includes an action on an associated part or" this contact or on its holder.
- the movable armature system comprises two distinct armatures one of which is termed the principal and is intended to act on the movable contact by a direct kinematic connection, whilst the other, termed auxiliary controls the freeing of the release system.
- This auxiliary armature moves against a feeble resetting spring, so that it is attracted by an intensity of current below that corresponding to the attraction of the principal armature.
- the principal armature acts from the commencement of its displacement, to shift the movable contact, this movable contact being carried by the principal armature itself or by a part actuated directly by this armature.
- the movable armature causes, during its initial movement of attraction, the intervention of the release system, the direct action of the armature on the movable contact taking place only after the termination of the movement necessary to cause the said intervention.
- the movable armature therefore exerts, independently of this system, a striking action directly on the movable contact of which it thus accelerates the displacement.
- the system of release may with advantage be that serving for the delayed release when the circuit-breaker is provided with such a release.
- the contact pressure between the fixed and movable contacts may be obtained, following the principles of the invention, by a rocking lever intended to be operated by the movable armature and subjected to the action of a resetting spring the line of action of which passes, on its manipulation, to the other side of its pivotal axis. Furthermore, the end of the spring associated with the said rocking lever is attached to another rocking lever the pivotal point of which is fixed in such manner that, in the position of engagement of the circuit breaker, the line of action of this spring passes between the pivotal points of the two said rocking levers. This second rocking lever is retained against the action of the spring by a pawl constituting with this rocking lever, the release mechanism specified above.
- FIGS 1 to 3 are diagrammatic views showiizng three different embodiments of the inven- In these difierent figures, the movable contact 2 is carried by a rocking lever 3 pivoting about a fixed point 3a.
- This rocking lever is subjected to the action of a spring l, one extremity of which is pivotally attached to the rocking lever 3 at 3b, whilst the other is pivotally attached to a second rocking lever 5 that is itself pivotally secured as at 511.
- the arrangement of the rocking levers 3 and 5, as also of the spring Q is such that in the position of engagement, that is to say, that shown in the figures, the line or action of the spring passes between the pivot points 3a and 5a of the two rocking levers.
- the rocking lever 5 is retained in the position shown by a pawl 7 adapted to be actuated by the extremity of a bimetallic blade inserted in the circuit of the fixed and movable contacts through the winding of a release coil 9.
- the extremity of the bimetallic blade acts as shown, on a supplementary arm l rigidly connected to the pawl 1; in the case of an over-load, the bimetallic blade 8 causes the displacement of the pawl I.
- the second rocking lever moves in the direction of the arrow X under the action of the spring 4 until the line of action of this spring has passed on the other side of the pivotal point 3a.
- a stop 5b will be provided for the lever 5. From this moment, the spring 4% acts to displace rapidly the contact-carrying rocking lever 3 and to effect the opening of the circuit. For proper operation, a suitable stop for lever 5 is provided, such as is shown at 5b.
- the movable armature of the release coil 9 is constituted by a core ll sliding about a thrust rod 12 of non-magnetic material and bearing directly on the rocking lever 3. If a considerable overload should occur the core I l moves against the action of its feeble resetting spring 13 until a rod is integral with the core abuts against the lever arm H3, and displaces the pawl I thus causing the release.
- the core ll acts not only in the manner described above, but it also carries along with it the thrust rod I2, by contacting with a collar Ma.
- the thrust rod I2 acts to cause the immediate displacement of the contact-carrying rocking lever 3 and thus causes the opening of the circuit in a very short space of time, independently of the movement accomplished by the release system 5'i.
- the core ii is keyed directly on the thrust rod I2.
- An auxiliary armature i5 is slidably disposed on this thrust rod, in. association with a feeble spring 16.
- the core I I does not have an actuating force suflicient to cause the direct displacement of the rocking lever 3.
- the auxiliary armature i5 moves and compresses the spring It and operates the pawl 1 through the intermediary of a lever i1 and an arm [8.
- the core II causes oscillation of the rocking lever 3 independently of the movement which might have been communicated to this rocking lever by the liberation of the release system 5, i by the auxiliary armature 15.
- the invention presents not only the advantage of causing an extremely rapid separation of the contacts, but also of proportioning the opening effort to the intensity of the current causing it, since the armature is attracted all the more forcefully the stronger the current. Further more, the release spring which, alone, can cause the opening of the circuit as soon as the movable contact is dis-engaged, may be made comparatively weak. This has as a result the reduction of the stresses on the pawls, thus increasing the precision of their operation and reducing their wear.
- This circuit-breaker is particularly useful as a small circuit-breaker with great circuitbreaking capacity, mounted on a base or in the form of a plug with pins or for screwing.
- An automatic circuit breaker comprising a fixed contact, a movable contact, means normally resiliently urging said movable contact against said fixed contact, spring actuated means movable from one position to another position tending to open the movable contact, locking means for restraining the last mentioned means to one position, a release coil through which a circuit current .ilows, a liberating member operatively connected to said locking means and connected to be responsive to an overload current through the coil for unlocking said spring actuated member, a member directly mechanically connected to the movable contact, and a movable armature for cooperating with said release coil under the action of said overload current to act first on said liberating member and subsequently directly on the member directly connected to the movable contact.
- an automatic circuit-breaker comprising a delayed action element through which the circuit current flows and means by which it unlocks said releasable device independently of said movable armature, under the action of an overload current which is not sufficient to cause the attraction of the said armature by said coil.
- the means for urging the movable contact against the fixed contact comprise a rocking lever connected to the movable contact and acted upon by said armature, a pivotal axis for said lever, and a resetting spring for said lever disposed on one side of said axis and arranged in such a manner that, at the moment of opening of the contacts, the line of action of said resetting spring passes to the other side of said axis.
- the means for urging the movable contact against the fixed contact comprise a first rocking lever connected to the movable contact and acted upon by said armature, a pivotal axis for said lever, a second rocking lever, a pivotal axis for said second rocking lever, a resetting spring for said first lever disposed to have its line of action on one side of said first axis and having its ends attached to said first and second rocking levers, and the restraining means includes an element retaining said second lever against the action of said resetting spring, the pivotal axis of said second lever being arranged and located in such a manner that, on release of said second lever from said element, the line of action of said spring passes to the other side of said first axis.
- An automatic circuit breaker comprising a fixed contact, a movable contact, means normally resiliently urging said movable contact against said fixed contact, means for displacing said movable contact from closed position, a release coil through which a circuit current flows, means for actuating said displacing means in response to an overload current through the circuit breaker, a rod positioned to act on the movable contact, a main armature mounted on said rod, an auxiliary armature carried loosely on said rod and connected for actuating the displacing means in response to an overload.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
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 |
---|---|
US2551302A true US2551302A (en) | 1951-05-01 |
Family
ID=32231636
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US632441A Expired - Lifetime US2551302A (en) | 1940-04-23 | 1945-12-03 | Automatic circuit breaker |
US632442A Expired - Lifetime US2551303A (en) | 1940-04-23 | 1945-12-03 | Automatic circuit breaker |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US632442A Expired - Lifetime US2551303A (en) | 1940-04-23 | 1945-12-03 | Automatic circuit breaker |
Country Status (6)
Country | Link |
---|---|
US (2) | US2551302A (no) |
BE (2) | BE457696A (no) |
CH (1) | CH256667A (no) |
FR (2) | FR866592A (no) |
GB (2) | GB599407A (no) |
NL (3) | NL119357B (no) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493264A (en) * | 1993-10-15 | 1996-02-20 | Schneider Electric Sa | Protection apparatus formed by association of a circuit breaker in series with an effector |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL76843C (no) * | 1940-04-23 | |||
DE1071821B (no) * | 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 |
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 |
FR2123188B1 (no) * | 1971-01-28 | 1976-05-28 | Teco | |
DE2348613C2 (de) * | 1973-09-27 | 1975-11-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Selbstschalter, insbesondere Schutzschalter |
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. |
DK1671604T3 (da) * | 1996-12-10 | 2009-11-09 | Purdue Research Foundation | Ventil af syntetisk væv |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE297184C (no) * | ||||
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 |
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 |
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 |
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 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2336871A (en) * | 1942-02-28 | 1943-12-14 | Gen Electric | Electric switch |
-
0
- NL NL76843D patent/NL76843C/xx active
- NL NL73337D patent/NL73337C/xx active
- BE BE441207D patent/BE441207A/xx unknown
- BE BE457696D patent/BE457696A/xx unknown
- NL NL119357D patent/NL119357B/xx unknown
-
1940
- 1940-04-23 FR FR866592D patent/FR866592A/fr not_active Expired
-
1945
- 1945-08-21 FR FR54180D patent/FR54180E/fr not_active Expired
- 1945-09-19 GB GB24286/45A patent/GB599407A/en not_active Expired
- 1945-09-27 GB GB25112/45A patent/GB600421A/en not_active Expired
- 1945-09-28 CH CH256667D patent/CH256667A/fr unknown
- 1945-12-03 US US632441A patent/US2551302A/en not_active Expired - Lifetime
- 1945-12-03 US US632442A patent/US2551303A/en not_active Expired - Lifetime
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE297184C (no) * | ||||
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 |
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 |
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 |
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 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493264A (en) * | 1993-10-15 | 1996-02-20 | Schneider Electric Sa | Protection apparatus formed by association of a circuit breaker in series with an effector |
Also Published As
Publication number | Publication date |
---|---|
BE457696A (no) | |
NL73337C (no) | |
CH256667A (fr) | 1948-08-31 |
NL76843C (no) | |
NL119357B (no) | |
BE441207A (no) | |
US2551303A (en) | 1951-05-01 |
GB599407A (en) | 1948-03-11 |
GB600421A (en) | 1948-04-08 |
FR866592A (fr) | 1941-08-20 |
FR54180E (fr) | 1948-04-21 |
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