EP0059475B1 - A current limiter - Google Patents
A current limiter Download PDFInfo
- Publication number
- EP0059475B1 EP0059475B1 EP19820101606 EP82101606A EP0059475B1 EP 0059475 B1 EP0059475 B1 EP 0059475B1 EP 19820101606 EP19820101606 EP 19820101606 EP 82101606 A EP82101606 A EP 82101606A EP 0059475 B1 EP0059475 B1 EP 0059475B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contactor
- contacts
- arc
- current limiter
- contactors
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/20—Bridging contacts
- H01H1/2041—Rotating bridge
- H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
Definitions
- the present invention relates to a current limiter for protecting electric circuits. More particularly, the invention as claimed is intended to provide a novel current limiter in which make-and-break contacts are surrounded with arc shields so as to rapidly and greatly raise the arc voltage of an electric arc struck across the contacts, thereby to attain an effective current-limiting function.
- the present invention consists in a current limiter in which a pair of contactors having respective contacts fastened thereto are arranged being mutually opposing and in parallel to each other and being disposed so that when an overload current exceeding a determined threshold flows through them said contactors are separated by electrodynamic repulsive forces whereby the contacts are provided with arc shields surrounding them.
- the arc shields are formed of a highly resistive material having a resistivity higher than that of the contactors and which effectively injects the metal particles of the contacts into an electric arc struck across these contacts, thereby to rapidly and greatly raise the arc voltage of the electric arc so as to enhance the current-limiting performance of the current limiter.
- numeral 1 designates a casing which is molded of an electrically insulating material.
- a rotary contactor 2 is disposed inside the casing 1 in a manner to be turnable about a pivot pin 4 which is inserted in an elliptical hole 3 penetrating through the rotary contactor in the position of the center of gravity thereof.
- Movable contacts 5a and 5b are disposed at both the ends of the rotary contactor 2 in the diametrical direction thereof.
- stationary contactors 6a and 6b which pass through the walls of the casing.
- the stationary contactors 6a and 6b are respectively provided at their ends with stationary contacts 7a and 7b which fall within the loci of rotation of the movable contacts 5a and 5b of the rotary contactor 2.
- the movable contacts 5a and 5b are respectively held against the stationary contacts 7a and 7b under a required pressure by means of springs 8a and 8b.
- Parallel current paths close to each other are formed by the mutually opposing longitudinal parts of the two stationary contactors 6a and 6b and the rotary contactor 2, that is, parts 6a1 and 2a and parts 6b1 and 2b.
- the rotary contactor 2 has its longitudinal parts 2a and 2b located in opposition to the longitudinal parts 6a1 and 6b1 of the stationary contactors 6a and 6b, respectively, as shown in Figure 1a. Accordingly, it forms the two sets of parallel current paths in which the senses (polarities) of currents flowing through the opposed longitudinal parts are opposite to each other. Therefore, when a current in excess of a predetermined value flows through this current limiter, the rotary contactor 2 receives counterclockwise turning forces based on electromagnetic repulsive forces induced between it and the two parallel stationary contactors 6a and 6b, and the turning forces separate the two sets of contacts 5a and 7a and 5b and 7b against the respective springs 8a and 8b.
- the electric arcs are struck across the contacts.
- the arcs are cooled and split and then extinguished by arc extinguishing plates which are disposed in the arc extinguishing chambers 9a and 9b.
- the current limiter shown in Figures 1a and 1b has the feature that the operation of the separating the contacts can be promptly effected because the two repulsive forces in the same directions act on the rotary contactor 2 at the same time.
- the arc voltage of the electric arc across each set of contacts is structurally limited to a certain value, and the current limiting effect is not fully satisfactory.
- the circumstances of the operation of both contacts will be described.
- the arc resistance has the following relationship:
- the contact particles p 1 , P2 and p 3 thus emitted have their temperature raised from the boiling point of the metal of the contacts, i.e., approximately 3,000°C, to a temperature at which the particles bear an electric conductivity, i.e., at least 8,000°C, or to a still higher temperature of approximately 20,000°C. Therefore, the particles take energy out of the arc space and lower the temperature of the arc space, with the result that an arc resistance is generated.
- the quantity of energy which the contact particles take out (absorb) of the arc space is greatly affected by the extent of the temperature rise of the particles. In turn, the extent of the temperature rise is determined by the positions and emission paths in the arc space, of the electrode particles emitted from the contacts.
- the contact particles p, emitted from near the centers of the opposing surfaces X take large quantities of energy out of the arc space, but the contact particles P2 emitted from the surfaces Y including the aforementioned contact surfaces and the parts of the conductor surfaces deprive the arc space of smaller quantities of energy than those of the contact particles p i .
- the contact particles p 3 emitted from the peripheral parts of the opposing surfaces X can take out only intermediate quantities of energy between the quantities of energy which the contact particles p 1 , and P2 absorb.
- Figure 3 shows an embodiment of a current limiter according to the present invention.
- the contacts 5a and 5b of the rotary contactor 2 are respectively surrounded with arc shields 10 and 10b, while the contacts 7a and 7b of the stationary contactors 6a and 6b are respectively surrounded with arc shields 11 a and 11b.
- Symbols 12a and 12b indicate pieces of an insulating material which cover the conductor surfaces or bare charging parts of the rotary contactor 2 opposing to the stationary contactors 6a and 6b, respectively, while symbols 13a and 13b indicate pieces of the insulating material which similarly cover the bare charging parts of the stationary contactors 6a and 6b, respectively.
- the other parts are the same as in the prior construction shown in Figures 1a and 1b.
- All the arc shields 10a, 10b, 11 a and 11b are formed of a highly resistive material which has a resistivity higher than that of the base conductor, for example, an organic or inorganic insulator, or a highly resistive metallic material such as nickel, iron, copper-nickel, copper-manganese, manganin, iron-carbon, iron-nickel, and iron- chromium.
- the arc shields As methods for forming the arc shields, there are a method in which a plate- shaped member fabricated of the highly resistive material is snugly fitted and fixed to the contact part as typically illustrated by the mounting state of the arc shield 11a on the contact 7a of the stationary contactor 6a in Figure 4, and a method in which the conductor surface is coated with a highly resistive material such as ceramic by, for example, the plasma jet spraying. According to the latter method based on the coating, the arc shields can be formed inexpensively and simply. Especially, the weight of the arc shields on the rotary contactor side becomes light. This brings forth the advantage that the moment of inertia becomes small to increase the contact separating speed and to raise the arc voltage.
- the arc shield is formed with a plate shape. This is because it is effective to confine the arc, as will be described later.
- Figure 5 shows a diagram of electrical connection wherein a resistor 15 is disposed in parallel with an electric circuit for which the current limiter 14 shown in Figure 3 is used.
- the resistor 15 is shortcircuited during the engagement of the contacts of the current limiter, whereas it is inserted in the electric circuit during the separation of the contacts.
- the resistor 15 is effective to extinguish the arc.
- FIG. 7 shows such current limiter to which the present invention is applicable.
- numeral 21 designates a casing which is molded of an electrically insulating material.
- a movable contactor 22 is disposed inside the casing 21 in a manner to be turnable about a pivot pin 24 which is inserted through a hole 23.
- One end of the movable contactor 22 is provided with a contact 25, while the other end thereof is connected to an external conductor 31 through a flexible copper-stranded wire 30.
- a stationary contactor 26 is provided at its end with a contact 27 which falls within the locus of rotation of the contact 25 of the movable contactor 22.
- the contact 25 is held in touch with the contact 27 under a required pressure by means of a spring 28.
- Parallel current paths close to each other are formed by the mutually opposing longitudinal parts of the stationary contactor 26 and the rotary contactor 22.
- An electric arc which is struck across the contacts 25 and 27 when they are separated from each other is stretched and cooled and then extinguished by arc extinguishing plates 32 is an arc extinguishing chamber 29 defined in the casing 21.
- the movable contactor 22 has its longitudinal part located in opposition to the longitudinal part of the stationary contactor 26, so that the senses or polarities of currents flowing through the longitudinal parts of both the contactors are opposite to each other. Accordingly, when a current in excess of a predetermined value flows through this current limiter, the movable contactor 22 receives a counterclockwise turning force based on an electromagnetic repulsive force induced between it and the parallel stationary contactor 26, and the contacts 25 and 27 begin to separate against the spring 28, so that an electric arc is struck across the contacts. The arc is cooled and split and then extinguished by the arc extinghishing plates 32 disposed in the arc extinguishing chamber 29. With the above-stated current limiter of Figure 7, however, the arc voltage across the contacts is limited to a certain value as described with reference to Figure 2, and the current limiting effect is not fully satisfactory.
- FIG. 8 shows a current limiter body 33 in another embodiment of the current limiter according to the present invention.
- arc shields 34a and 34b are disposed in a manner to respectively and individually surround the contact 25 of the movable contactor 22 and the contact 27 of the stationary contactor 26.
- a piece of an insulating material 35a is disposed on the conductor surface or bare charging part of the movable contactor 22 opposing to the stationary contactor 26, while a piece of the insulating material 35b is similarly disposed on the bare charging part of the stationary contactor 26.
- the method of forming the arc shields 34a and 34b is the same as stated in the embodiment of Figure 3.
- the arc voltage can be rapidly raised by the arc shields 34a and 34b so as to achieve an effective current-limiting function.
- Figure 9 shows still another embodiment of the current limiter according to the present invention.
- this embodiment includes a pair of movable contactors 22a and 22b which are made of a conductor and which form parallel current paths. Both these contactors have contacts 25a and 25b on one end thereof, and have flexible copper-stranded wires 30a and 30b connected to the other ends thereof. These contactors are rotatable about pivot pins 24a and 24b, respectively.
- Symbols 34c and 34d indicate arc shields surrounding the respective contacts 25a and 25b, while symbols 35c and 35d indicate pieces of an insulating material covering the bare charging parts of the respective movable contactors 22a and 22b.
- the method of forming the arc shields 34c and 34d is the same as stated in conjunction with the embodiment of Figure 3.
- the arc voltage can be rapidly raised by the arc shields 34c and 34d so as to achieve an effective current-limiting function.
- the resistor may be connected in parallel as illustrated in Figure 5, whereby the arc voltage can be promptly turned over to the resistor after the occurrence of the arc across the contacts, and wear of the contacts can be prevented.
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Description
- The present invention relates to a current limiter for protecting electric circuits. More particularly, the invention as claimed is intended to provide a novel current limiter in which make-and-break contacts are surrounded with arc shields so as to rapidly and greatly raise the arc voltage of an electric arc struck across the contacts, thereby to attain an effective current-limiting function.
- In prior current liters (DE-B-1,638,157, JP-A-54-75055), an electric arc struck across contacts expands its feed (base) to the parts of conductors around and near the contacts. This leads to the disadvantage that it is difficult to generate a high arc voltage, and that a satisfactory current-limiting function cannot be achieved.
- The present invention consists in a current limiter in which a pair of contactors having respective contacts fastened thereto are arranged being mutually opposing and in parallel to each other and being disposed so that when an overload current exceeding a determined threshold flows through them said contactors are separated by electrodynamic repulsive forces whereby the contacts are provided with arc shields surrounding them. The arc shields are formed of a highly resistive material having a resistivity higher than that of the contactors and which effectively injects the metal particles of the contacts into an electric arc struck across these contacts, thereby to rapidly and greatly raise the arc voltage of the electric arc so as to enhance the current-limiting performance of the current limiter. Preferred ways of carrying out the invention are described below with reference to drawings, in which:-
- Figure 1a is a sectional plan view of a conventional current limiter to which the present invention is applicable;
- Figure 1b is a sectional plan view showing the state in which the contacts of the current limiter in Figure 1a are separated;
- Figure 2 is a model diagram showing the behavior of an electric arc which is struck across the contacts of the current limiter in Figure 1a;
- Figure 3 is a sectional plan view showing an embodiment of a current limter according to the present invention;
- Figure 4 is a perspective view showing the relationship between a contact and an arc shield for use in the current limiter according to the present invention;
- Figure 5 is an electrical connection diagram showing an example in which the current limiter according to the present invention is used for an electric circuit;
- Figure 6 is a model diagram showing the action of the arc shields for use in the current limiter according to the present invention;
- Figure 7 is a sectional plan view of another conventional current limiter of a type different from that of the current limiter in Figure 1a, to which the present invention is also applicable;
- Figure 8 is a sectional plan view showing another embodiment of the current limiter according to the present invention; and
- Figure 9 is a sectional plan view showing still another embodiment of the current limiter according to the present invention.
- In the drawings, the same symbols indicate identical or corresponding parts.
- A conventional current limiter to which the present invention is applicable will be described with reference to Figures 1 a and 1b. In the drawings, numeral 1 designates a casing which is molded of an electrically insulating material. A
rotary contactor 2 is disposed inside the casing 1 in a manner to be turnable about a pivot pin 4 which is inserted in anelliptical hole 3 penetrating through the rotary contactor in the position of the center of gravity thereof.Movable contacts rotary contactor 2 in the diametrical direction thereof. Inside the casing 1, there are arrangedstationary contactors stationary contactors stationary contacts movable contacts rotary contactor 2. In the normal condition, themovable contacts stationary contacts springs stationary contactors rotary contactor 2, that is, parts 6a1 and 2a and parts 6b1 and 2b. Electric arcs which are struck acrosscontacts contacts arc extinguishing chambers - In the normal condition the current limiter constructed as explained above, the
rotary contactor 2 has itslongitudinal parts 2a and 2b located in opposition to the longitudinal parts 6a1 and 6b1 of thestationary contactors rotary contactor 2 receives counterclockwise turning forces based on electromagnetic repulsive forces induced between it and the two parallelstationary contactors contacts respective springs arc extinguishing chambers rotary contactor 2 at the same time. With the prior current limiter described above, however, the arc voltage of the electric arc across each set of contacts is structurally limited to a certain value, and the current limiting effect is not fully satisfactory. Hereunder, the circumstances of the operation of both contacts will be described. -
- where
- R: arc resistance (0)
- p: arc resistivity (O.cm)
- 1: arc length (cm)
- S: arc sectional area (cm2)
respective contacts contacts contactors - The contact particles p1, P2 and p3 thus emitted have their temperature raised from the boiling point of the metal of the contacts, i.e., approximately 3,000°C, to a temperature at which the particles bear an electric conductivity, i.e., at least 8,000°C, or to a still higher temperature of approximately 20,000°C. Therefore, the particles take energy out of the arc space and lower the temperature of the arc space, with the result that an arc resistance is generated. The quantity of energy which the contact particles take out (absorb) of the arc space is greatly affected by the extent of the temperature rise of the particles. In turn, the extent of the temperature rise is determined by the positions and emission paths in the arc space, of the electrode particles emitted from the contacts. In consequence, in the prior current limiter shown in Figure 2, the contact particles p, emitted from near the centers of the opposing surfaces X take large quantities of energy out of the arc space, but the contact particles P2 emitted from the surfaces Y including the aforementioned contact surfaces and the parts of the conductor surfaces deprive the arc space of smaller quantities of energy than those of the contact particles pi. In addition, the contact particles p3 emitted from the peripheral parts of the opposing surfaces X can take out only intermediate quantities of energy between the quantities of energy which the contact particles p1, and P2 absorb. That is, in the range in which the contact particles p1, flow, the large quantities of energy are taken out to lower the temperature of the arc space, so that the arc resistivity p is increased. However, in the range in which the contact particles P2 and p3 move, the temperature of the arc space is lowered little because large quantities of energy are not taken out. Accordingly, the increase of the arc resistivity p cannot be achieved. Moreover, since the arc is generated from the opposing surfaces X and the contact surfaces Y, the arc sectional area increases, resulting in a lowered arc resistance.
- Such outflow of energy from the arc space as caused by the contact particles balanced with the electrical injection energy. It is therefore understood that, when the contact particles generated across the contacts are farther injected into the arc space, naturally the temperature of the arc space is more lowered, with the result that the arc resistivity can be increased to raise the arc voltage.
- Figure 3 shows an embodiment of a current limiter according to the present invention. Referring to Figure 3, the
contacts rotary contactor 2 are respectively surrounded with arc shields 10 and 10b, while thecontacts stationary contactors Symbols rotary contactor 2 opposing to thestationary contactors stationary contactors - All the arc shields 10a, 10b, 11 a and 11b are formed of a highly resistive material which has a resistivity higher than that of the base conductor, for example, an organic or inorganic insulator, or a highly resistive metallic material such as nickel, iron, copper-nickel, copper-manganese, manganin, iron-carbon, iron-nickel, and iron- chromium. As methods for forming the arc shields, there are a method in which a plate- shaped member fabricated of the highly resistive material is snugly fitted and fixed to the contact part as typically illustrated by the mounting state of the arc shield 11a on the
contact 7a of thestationary contactor 6a in Figure 4, and a method in which the conductor surface is coated with a highly resistive material such as ceramic by, for example, the plasma jet spraying. According to the latter method based on the coating, the arc shields can be formed inexpensively and simply. Especially, the weight of the arc shields on the rotary contactor side becomes light. This brings forth the advantage that the moment of inertia becomes small to increase the contact separating speed and to raise the arc voltage. In the present embodiment, the arc shield is formed with a plate shape. This is because it is effective to confine the arc, as will be described later. - Figure 5 shows a diagram of electrical connection wherein a
resistor 15 is disposed in parallel with an electric circuit for which thecurrent limiter 14 shown in Figure 3 is used. In this circuit arrangement, theresistor 15 is shortcircuited during the engagement of the contacts of the current limiter, whereas it is inserted in the electric circuit during the separation of the contacts. In addition, when the arc resistance of the electric arc struck across the contacts exceeds the resistance of theresistor 15, the current of the circuit turns over to theresistor 15. Therefore, theresistor 15 is effective to extinguish the arc. - Now, the behaviour of the contact particles will be described with reference to Figure 6 in order to explain the effect of the arc shield employed in the embodiment of Figure 3. In Figure 3, symbols X, pi, p3 and m correspond to those indicated in Figure 2, respectively. Symbol Z2 indicates the envelope of the arc space shrunk by the device of the present invention, and symbol O2 the flow line of the contact particle p3 flowing or moving along a path different from that in the prior device. Parts Q indicated by crosshatching are spaced in which the pressure generated by the electric arc is reflected by the arc shields 10 and 11a, thereby to raise the pressure which has been lowered in the prior device without arc shield.
- According to such construction, pressure values in the spaces Q cannot exceed the pressure value of the space of the arc itself, but much higher values are exhibited at least in comparison with values in the case where the arc shields are not provided. Accordingly, the considerably high pressures in the spaces Q caused by the arc shields 10a and 11 a afford forces suppressing the spread of the space of the arc and confine the arc within a small space. This results in constricting and confining into the arc space the flow lines of the contact particles p, and p3 emitted from the opposing surfaces X. Therefore, the contact particles emitted from the opposing surfaces X are effectively injected into the arc space. As a result, large quantities of contact particles deprive the arc space of large quantities of energy as compared to the prior device. Therefore, the arc space is remarkably cooled, to considerably increase the arc resistivity or arc resistance R and to greatly raise the arc voltage.
- Further, when at least one of the opposing conductor surfaces of the rotary contactor and the stationary contactor is covered with the insulating material as in the embodiment shown in Figure 3, dielectric breakdown in any other place than the contacts is prevented and a satisfactory current-limiting performance is demonstrated even if the arc voltage across the contacts is raised by the action of the arc shields.
- While the current limiter thus far described is of the type in which the centrally mounted conductor turns thereby to close or open the contacts, the present invention is also applicable to a current limiter of another type. Figure 7 shows such current limiter to which the present invention is applicable. In Figure 7, numeral 21 designates a casing which is molded of an electrically insulating material. A
movable contactor 22 is disposed inside thecasing 21 in a manner to be turnable about apivot pin 24 which is inserted through ahole 23. One end of themovable contactor 22 is provided with acontact 25, while the other end thereof is connected to anexternal conductor 31 through a flexible copper-strandedwire 30. Astationary contactor 26 is provided at its end with acontact 27 which falls within the locus of rotation of thecontact 25 of themovable contactor 22. In the normal condition, thecontact 25 is held in touch with thecontact 27 under a required pressure by means of aspring 28. Parallel current paths close to each other are formed by the mutually opposing longitudinal parts of thestationary contactor 26 and therotary contactor 22. An electric arc which is struck across thecontacts arc extinguishing plates 32 is anarc extinguishing chamber 29 defined in thecasing 21. - In the current limiter constructed as stated above, the
movable contactor 22 has its longitudinal part located in opposition to the longitudinal part of thestationary contactor 26, so that the senses or polarities of currents flowing through the longitudinal parts of both the contactors are opposite to each other. Accordingly, when a current in excess of a predetermined value flows through this current limiter, themovable contactor 22 receives a counterclockwise turning force based on an electromagnetic repulsive force induced between it and the parallelstationary contactor 26, and thecontacts spring 28, so that an electric arc is struck across the contacts. The arc is cooled and split and then extinguished by thearc extinghishing plates 32 disposed in thearc extinguishing chamber 29. With the above-stated current limiter of Figure 7, however, the arc voltage across the contacts is limited to a certain value as described with reference to Figure 2, and the current limiting effect is not fully satisfactory. - Figure 8 shows a
current limiter body 33 in another embodiment of the current limiter according to the present invention. Referring to Figure 8, arc shields 34a and 34b are disposed in a manner to respectively and individually surround thecontact 25 of themovable contactor 22 and thecontact 27 of thestationary contactor 26. A piece of an insulatingmaterial 35a is disposed on the conductor surface or bare charging part of themovable contactor 22 opposing to thestationary contactor 26, while a piece of the insulatingmaterial 35b is similarly disposed on the bare charging part of thestationary contactor 26. The method of forming the arc shields 34a and 34b is the same as stated in the embodiment of Figure 3. - In the present embodiment, same as in the embodiment of Figure 3, the arc voltage can be rapidly raised by the arc shields 34a and 34b so as to achieve an effective current-limiting function.
- Figure 9 shows still another embodiment of the current limiter according to the present invention. As shown in the figure, this embodiment includes a pair of
movable contactors wires Symbols 34c and 34d indicate arc shields surrounding the respective contacts 25a and 25b, whilesymbols 35c and 35d indicate pieces of an insulating material covering the bare charging parts of the respectivemovable contactors - The method of forming the arc shields 34c and 34d is the same as stated in conjunction with the embodiment of Figure 3. In the present embodiment, same as in the embodiment of figure 3, the arc voltage can be rapidly raised by the arc shields 34c and 34d so as to achieve an effective current-limiting function.
- In case the embodiment shown in Figure 8 or 9 is applied to an electric circuit similar to the embodiment of Figure 3, the resistor may be connected in parallel as illustrated in Figure 5, whereby the arc voltage can be promptly turned over to the resistor after the occurrence of the arc across the contacts, and wear of the contacts can be prevented.
Claims (7)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3005581U JPS57143547U (en) | 1981-03-02 | 1981-03-02 | |
JP3005781U JPS57143549U (en) | 1981-03-02 | 1981-03-02 | |
JP30057/81U | 1981-03-02 | ||
JP30055/81U | 1981-03-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0059475A2 EP0059475A2 (en) | 1982-09-08 |
EP0059475A3 EP0059475A3 (en) | 1983-06-29 |
EP0059475B1 true EP0059475B1 (en) | 1986-06-25 |
Family
ID=26368319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19820101606 Expired EP0059475B1 (en) | 1981-03-02 | 1982-03-02 | A current limiter |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0059475B1 (en) |
DE (1) | DE3271813D1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0309923B1 (en) * | 1987-10-01 | 1994-12-14 | CGE- COMPAGNIA GENERALE ELETTROMECCANICA S.p.A. | Improved contact arrangement for a current limiting circuit breaker adapted to be actuated both manually and by an actuating electromagnet |
SE461557B (en) * | 1989-04-28 | 1990-02-26 | Asea Brown Boveri | CONTACT DEVICE FOR ELECTRICAL CONNECTORS |
JP2709251B2 (en) * | 1992-02-27 | 1998-02-04 | 寺崎電気産業株式会社 | Draw-out type circuit breaker |
DE10222668A1 (en) * | 2001-05-28 | 2002-12-05 | Fuji Electric Co Ltd | Molded case circuit breaker has rotary contact shoe positioned diagonally between two parallel linear fixed contact shoes to form Z-shaped conducting path |
DE102008037967A1 (en) * | 2008-08-13 | 2010-02-18 | Siemens Aktiengesellschaft | Rotary contact system for power switching device, has spring gripping molded inner contour of recess in spring loaded condition such that arms are provided with slack point characteristic during rotational motion relative to shaft segments |
US10037858B2 (en) | 2013-04-15 | 2018-07-31 | Abb Oy | Electric switch assembly |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1198899B (en) * | 1963-01-30 | 1965-08-19 | Siemens Ag | Circuit arrangement for spark extinction on mechanical contacts |
US3317866A (en) * | 1963-02-07 | 1967-05-02 | Terasaki Denki Sangyo Kk | Automatic circuit interrupter having magnetic blowoff means |
US3464038A (en) * | 1967-02-16 | 1969-08-26 | Terasaki Denki Sangyo Kk | Circuit interrupter |
DE1765050B2 (en) * | 1968-03-26 | 1976-08-05 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | ELECTRICAL CONTACT OR ELECTRODE ARRANGEMENT FOR THE FIXED STABILIZATION OF THE ARC FLOOR POINTS AND TO REDUCE THE BURN-ON LOSS |
US3997746A (en) * | 1974-04-23 | 1976-12-14 | Airpax Electronics, Incorporated | Circuit breaker with arc chamber screen |
JPS5475055A (en) * | 1977-11-28 | 1979-06-15 | Hitachi Ltd | Current limiting breaker |
-
1982
- 1982-03-02 EP EP19820101606 patent/EP0059475B1/en not_active Expired
- 1982-03-02 DE DE8282101606T patent/DE3271813D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0059475A3 (en) | 1983-06-29 |
EP0059475A2 (en) | 1982-09-08 |
DE3271813D1 (en) | 1986-07-31 |
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