CN210223923U - Small-sized circuit breaker - Google Patents
Small-sized circuit breaker Download PDFInfo
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- CN210223923U CN210223923U CN201921042590.9U CN201921042590U CN210223923U CN 210223923 U CN210223923 U CN 210223923U CN 201921042590 U CN201921042590 U CN 201921042590U CN 210223923 U CN210223923 U CN 210223923U
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Abstract
The utility model relates to the field of low-voltage apparatus, in particular to a miniature circuit breaker, which comprises a lower arc striking plate, a moving contact, a static contact and an arc extinguishing chamber, wherein the moving contact and the static contact are arranged oppositely, the arc extinguishing chamber is arranged between the static contact and the lower arc striking plate, an arc striking channel A is formed between the static contact and the lower arc striking plate, and an arc inlet of the arc extinguishing chamber is connected with the arc striking channel A; the auxiliary arc striking plate is electrically connected with the fixed contact; the static contact comprises a static contact arc striking angle, the static contact arc striking angle comprises an arc striking angle second part which is horizontally arranged at an arc striking angle first part connected in a bending way, the arc striking angle second part and one end of the lower arc striking plate are respectively arranged at two sides of the arc extinguishing chamber, and the auxiliary arc striking plate is arranged between the arc striking angle second part and the arc extinguishing chamber; the utility model discloses a miniature circuit breaker, its supplementary striking board makes the utilization efficiency of explosion chamber higher, and the arc extinguishing effect is better, has improved miniature circuit breaker's breaking capacity.
Description
Technical Field
The utility model relates to a low-voltage apparatus field, concretely relates to miniature circuit breaker.
Background
The arc striking structure of the miniature circuit breaker generally comprises a static contact arc striking angle of a static contact, a movable contact, a lower arc striking plate and other structures; the static contact is generally formed by stamping a copper plate, and due to the cost relationship, in order to reduce the cost of the miniature circuit breaker, the width of an arc striking angle of the static contact formed by actual stamping is very narrow, which is not beneficial to leading electric arc into the top of the arc extinguish chamber and extinguishing quickly, so that most of electric arc air flow only passes through the lower half part of the arc extinguish chamber, electric arc does not or only slightly enters the upper half part of the arc extinguish chamber, so that the electric arc does not closely and fully contact with a metal grid piece of the upper half part of the arc extinguish chamber, the cooling and cutting effects of the metal grid piece on the electric arc are greatly reduced, the grid piece of the arc extinguish chamber.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a miniature circuit breaker, its supplementary striking board makes the utilization efficiency of explosion chamber higher, and the arc extinguishing effect is better, has improved miniature circuit breaker's breaking capacity.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a miniature circuit breaker comprises a lower arc striking plate 1, a movable contact 2a, a fixed contact 2b and an arc extinguishing chamber 4, wherein the movable contact 2a and the fixed contact 2b are arranged oppositely, the arc extinguishing chamber 4 is arranged between the fixed contact 2b and the lower arc striking plate 1, an arc striking channel A is formed between the fixed contact 2b and the lower arc striking plate 1, and an arc inlet of the arc extinguishing chamber 4 is connected with the arc striking channel A;
the auxiliary arc striking plate 3 is electrically connected with the static contact 2 b; the static contact 2b comprises a static contact arc-striking angle 232b, the static contact arc-striking angle 232b comprises a first arc-striking angle portion 22b and a second arc-striking angle portion 23b, the first arc-striking angle portion 22b is connected with the second arc-striking angle portion 23b in a bending mode, the second arc-striking angle portion 23b and one end of the lower arc-striking plate 1 are arranged on two sides of the arc-extinguishing chamber 4 respectively, and the auxiliary arc-striking plate 3 is arranged between the second arc-striking angle portion 23b and the arc-extinguishing chamber 4.
Preferably, the auxiliary arc ignition plate 3 comprises an arc ignition plate main plate 30, and the distance between the arc ignition plate main plate 30 and the arc extinguishing chamber 4 is 1-4 mm.
Preferably, the width of the auxiliary arc ignition plate 3 is greater than the width of the arc ignition angle second portion 23 b.
Preferably, the auxiliary arc ignition plate 3 comprises a second protrusion 31 arranged at one end of the arc ignition plate main plate 30 of the auxiliary arc ignition plate 3, and the distance D2 between the second protrusion 31 and the connection part of the first arc ignition angle part 22b and the second arc ignition angle part 23b is 1-6 mm; the junction of the first and second run-on angle portions 22b and 23b cooperates with the arc inlet of the arc chute 4.
Preferably, the arc ignition angle second part 23b is arranged in parallel with the arc extinguishing chamber 4, one end of the arc ignition angle second part 23b connected with the arc ignition angle first part 22b is provided with a first protrusion 24b protruding towards the auxiliary arc ignition plate 3, and the first protrusion 24b is connected with the second protrusion 31 in a contact manner.
Preferably, the auxiliary arc ignition plate 3 includes an arc ignition plate main plate 30 and a second protrusion 31, and the second protrusion 31 is disposed at one end of the arc ignition plate main plate 30 and located on an axis of the arc ignition plate main plate 30.
Preferably, the second protrusion 31 is a long strip-shaped structure and extends along the axial direction of the arc ignition plate main plate 30, and the length of the second protrusion 31 is greater than or equal to the length 1/2 of the arc ignition plate main plate 30.
Preferably, the lower arc striking plate 1 is of a herringbone structure and comprises a lower arc striking plate left portion 10 and a lower arc striking plate right portion 11, one end of the lower arc striking plate left portion 10 is connected with one end of the lower arc striking plate right portion 11 to form an arc striking protrusion, the arc striking protrusion protrudes towards the direction of the moving contact 2a, the other end of the lower arc striking plate left portion 10 is arranged on one side of the arc extinguishing chamber 4, an arc striking channel A is formed between the lower arc striking plate left portion 10 and the static contact 2b, and when the moving contact 2a is located at an opening position, the lower end of the moving contact is matched with the arc striking protrusion relatively.
Preferably, the other end of the right portion 11 of the lower arc ignition plate is connected with an overload protection device of the miniature circuit breaker.
Preferably, the fixed contact 2b includes a fixed contact, a connecting plate 20b, a contact mounting plate 21b and a fixed contact arc ignition angle 232b, the fixed contact is disposed on one side of the contact mounting plate 21b, one end of the connecting plate 20b is connected to the short circuit trip device 5 of the miniature circuit breaker, the other end of the connecting plate is connected to one end of the contact mounting plate 21b in a bent manner, the other end of the contact mounting plate 21b is connected to one end of the first arc ignition angle portion 22b, the joint between the contact mounting plate 21b and the first arc ignition angle portion 22b is of an arc-shaped structure, the other end of the first arc ignition angle portion 22b is connected to the second arc ignition angle portion 23b, the connecting plate 20b, the contact mounting plate 21b and the first arc ignition angle portion 22b are integrally formed into a U-shaped structure, a first protrusion 24b is disposed at one end of the second arc ignition angle portion 23b connected to the first arc ignition angle portion 22b, and the.
The utility model discloses a miniature circuit breaker, including the static contact, supplementary striking plate and lower striking plate, the static contact includes the static contact striking angle, the static contact striking angle sets up the both sides at the explosion chamber respectively with the one end of lower striking plate, supplementary striking plate sets up between static contact striking angle and explosion chamber and is connected with the static contact electricity, supplementary striking plate sets up with lower striking plate relatively, make the disconnected electric arc that produces of moving/static contact, at supplementary striking plate, in the effect of lower striking plate is the relatively even entering arc extinguishing chamber down, can not be like current miniature circuit breaker, most of or all electric arcs get into the explosion chamber from the one end of explosion chamber that is close to lower striking plate, be favorable to making electric arc and the interior metal grid piece of arc extinguishing chamber fully contact, show the disconnected effect that improves efficiency of arc extinguishing and miniature circuit breaker.
In addition, the width of the auxiliary arc striking plate is larger than that of the second part of the arc striking angle, so that the area for guiding electric arcs into the arc extinguishing chamber can be increased on the premise of not increasing the width of the arc striking angle of the static contact, and the breaking performance of the miniature circuit breaker can be greatly improved.
The auxiliary arc striking plate is characterized in that a second protrusion is arranged at one end of the auxiliary arc striking plate, the distance D2 between the second protrusion and the joint of the first arc striking angle part and the second arc striking angle part is 1-6mm, so that when electric arc meets the second protrusion, the electric arc can jump to the outlet direction of the arc extinguishing chamber, the moving speed of the electric arc is increased remarkably, the moving time of the electric arc is shortened, and the arc extinguishing efficiency is improved.
Drawings
Fig. 1 is a schematic projection diagram of the miniature circuit breaker of the present invention, which at least shows the position relationship among the auxiliary arc-extinguishing plate, the static contact, the arc-extinguishing chamber, the lower arc-striking plate and the moving contact;
fig. 2 is a schematic structural diagram of the miniature circuit breaker of the present invention, at least showing the structure of the stationary contact;
fig. 3 is a schematic structural diagram of the miniature circuit breaker of the present invention, at least showing the structure of the auxiliary arc striking plate.
Detailed Description
The following describes the detailed embodiment of the miniature circuit breaker according to the present invention with reference to the embodiments shown in fig. 1-3. The small-sized circuit breaker of the present invention is not limited to the description of the following embodiments.
The utility model discloses a miniature circuit breaker, it includes lower striking plate 1, moving contact 2a, static contact 2b and explosion chamber 4, moving contact 2a sets up the cooperation relatively with static contact 2b and realizes the separating brake and the combined floodgate of circuit breaker, explosion chamber 4 sets up between static contact 2b and lower striking plate 1, static contact 2b sets up relatively with lower striking plate 1, be formed with striking passageway A between static contact 2b and lower striking plate 1, the electric arc entry of explosion chamber 4 links to each other with striking passageway A, moving contact 2a sets up the entry at striking passageway A and is in static contact 2b cooperation use, moving contact 2a lower extreme sets up relatively and cooperates the use with lower striking plate 1;
the auxiliary arc striking plate 3 is electrically connected with the static contact 2 b; the static contact 2b comprises a static contact arc-striking angle 232b, the static contact arc-striking angle 232b comprises a first arc-striking angle portion 22b and a second arc-striking angle portion 23b, the first arc-striking angle portion 22b is connected with the second arc-striking angle portion 23b in a bending mode, the second arc-striking angle portion 23b and one end of the lower arc-striking plate 1 are arranged on two sides of the arc-extinguishing chamber 4 respectively, and the auxiliary arc-striking plate 3 is arranged between the second arc-striking angle portion 23b and the arc-extinguishing chamber 4.
The existing miniature circuit breaker has the static contact comprising a static contact arc striking angle, and the width of the static contact arc striking angle is small, so that electric arcs generated by breaking of the static/dynamic contact are not facilitated to enter the top of the arc extinguish chamber, most of electric arc airflow only flows through the lower half part of the arc extinguish chamber, only a small amount of electric arcs or no electric arcs enter the upper half part of the arc extinguish chamber, the electric arcs are not fully contacted with metal grid pieces in the arc extinguish chamber, the arc extinguish chamber is not fully utilized, the electric arc extinguishing efficiency is low, and the breaking effect of the miniature circuit breaker is.
The utility model discloses a miniature circuit breaker, including static contact 2b, supplementary striking plate 3 and lower striking plate 1, static contact 2b includes static contact striking angle 232b, static contact striking angle 232b and the one end of lower striking plate 1 set up respectively in the both sides of explosion chamber 4, supplementary striking plate 3 sets up between static contact striking angle 232b and explosion chamber 4 and with static contact 2b electricity connection, supplementary striking plate 3 sets up with lower striking plate 1 relatively, makes the electric arc that moving/static contact branch divides the branch and produces, in the auxiliary arc striking plate 3, lower arc striking plate 1's effect under relatively even entering explosion chamber 4, can not like current miniature circuit breaker, the overwhelming majority or whole electric arc gets into explosion chamber 4 from the one end that is close to lower arc striking plate 1 of explosion chamber 4, is favorable to making electric arc and the interior metal grid piece of explosion chamber 4 fully contact, is showing improvement arc extinguishing efficiency and miniature circuit breaker's disconnected effect.
Preferably, as shown in fig. 1, the auxiliary arc ignition plate 3 includes an arc ignition plate main plate 30, and a distance between the arc ignition plate main plate 30 and the arc extinguishing chamber 4 is 1-4 mm. Further, as shown in fig. 1 and 3, a second protrusion 31 is provided at one end of the auxiliary arc ignition plate 3, and a distance D2 between the second protrusion 31 and a connection portion of the first arc ignition angle portion 22b and the second arc ignition angle portion 23b is 1-6 mm. The utility model discloses a miniature circuit breaker, its move/static contact divide the disconnected back that produces the electric arc, and electric arc meets when the second is protruding 31, can jump, to the export direction jump of explosion chamber 4, is showing the moving speed that increases electric arc, has shortened the moving time of electric arc, is favorable to improving arc extinguishing efficiency.
Preferably, as shown in fig. 3, the auxiliary arc ignition plate 3 has a width greater than that of the arc ignition angle second portion 23 b. The auxiliary arc striking plate 3 can increase the area for guiding electric arc into the arc extinguishing chamber 4 on the premise of not increasing the width and the cost of the striking angle of the static contact, and can greatly improve the breaking performance of the miniature circuit breaker.
As shown in fig. 1-3, it is an embodiment of the miniature circuit breaker of the present invention.
As shown in fig. 1, the miniature circuit breaker of the present invention includes a lower arc striking plate 1, a movable contact 2a, a static contact 2b and an arc extinguishing chamber 4, the static contact 2b is disposed opposite to the lower arc striking plate 1, an arc striking channel a is formed between the static contact 2b and the lower arc striking plate, the arc extinguishing chamber 4 is disposed between the static contact 2b and the lower arc striking plate 1, an arc inlet of the arc extinguishing chamber 4 is connected to the arc striking channel a, the movable contact 2a is disposed at the inlet of the arc striking channel a and is used in cooperation with the static contact 2b, and the lower end of the movable contact 2a is disposed opposite to and used in cooperation with the lower arc striking plate 1; the miniature circuit breaker also comprises an auxiliary arc striking plate 3; the static contact 2b comprises a static contact arc striking angle 232b, the static contact arc striking angle 232b comprises a first arc striking angle portion 22b and a second arc striking angle portion 23b which are connected in a bending mode, the second arc striking angle portion 23b and one end of the lower arc striking plate 1 are arranged on two sides of the arc extinguishing chamber 4 respectively, the auxiliary arc striking plate 3 is arranged between the second arc striking angle portion 23b and the arc extinguishing chamber 4, and the auxiliary arc striking plate 3 is electrically connected with the static contact 2 b.
Specifically, the miniature circuit breaker of the utility model also comprises a base and a cover which are oppositely arranged and matched with each other, and the lower arc striking plate 1, the moving contact 2a, the static contact 2b, the arc extinguishing chamber 4 and the auxiliary arc striking plate 3 are all arranged between the base and the cover; as shown in fig. 1, the lower arc ignition plate 1 is disposed at the lower portion of the base, the movable contact 2a and the fixed contact 2b are disposed above the lower arc ignition plate 1, the movable contact 2a is disposed at the right side of the fixed contact 2b, the second portion 23b of the arc ignition angle of the fixed contact 2b and the left end of the lower arc ignition plate 1 are disposed at the upper side and the lower side of the arc extinguish chamber 4, the auxiliary arc ignition plate 3 is disposed between the second portion 23b of the arc ignition angle and the upper side of the arc extinguish chamber 4, the auxiliary arc ignition plate 3 is electrically connected with the fixed contact 2b, and the lower end of the movable contact 2a swings left and right to be closed/disconnected with the fixed.
Preferably, as shown in fig. 1, the distance between the auxiliary arc ignition plate 3 and the arc extinguishing chamber 4 is 1-4 mm. Further, the distance between the auxiliary arc striking plate 3 and the arc extinguishing chamber 4 is 1mm, 2mm, 3mm or 4 mm.
Preferably, as shown in fig. 2 and 3, the width of the auxiliary arc ignition plate 3 is greater than the width of the static contact arc ignition angle 232b of the static contact 2 b. Further, as shown in fig. 1 and 3, a second protrusion 31 is provided at one end of the auxiliary arc ignition plate 3, and a distance D2 between the second protrusion 31 and a connection portion of the first arc ignition angle portion 22b and the second arc ignition angle portion 23b is 1-6 mm. Further, the distance D2 is 1mm, 2mm, 3mm, 4mm, 5mm or 6 mm. Further, as shown in fig. 1, the junction of the first arc ignition angle portion 22b and the second arc ignition angle portion 23b is engaged with the arc inlet of the arc extinguishing chamber 4. Specifically, as shown in fig. 1, the junction of the first arc ignition angle portion 22b and the second arc ignition angle portion 23b is located above the arc inlet of the arc extinguishing chamber 4, and the two portions are parallel and level.
Preferably, as shown in fig. 2, one end of the arc ignition angle second portion 23b connected to the arc ignition angle first portion 22b is provided with a first protrusion 24b protruding toward the auxiliary arc ignition plate 3, and the first protrusion 24b is connected to the second protrusion 31 in a contacting manner. Specifically, as shown in fig. 2, a first protrusion 24b is disposed at the right end of the arc-striking angle second portion 23b, and the first protrusion 24b is a circular protrusion.
Preferably, as shown in fig. 1, the lower arc ignition plate 1 is of a herringbone structure and includes a lower arc ignition plate left portion 10 and a lower arc ignition plate right portion 11, one end of the lower arc ignition plate left portion 10 is connected with one end of the lower arc ignition plate right portion 11 to form an arc ignition protrusion, the arc ignition protrusion protrudes toward the direction of the movable contact 2a, the other end of the lower arc ignition plate left portion 10 is disposed on one side of the arc extinguish chamber 4, an arc ignition channel a is formed between the lower arc ignition plate left portion 10 and the fixed contact 2b, and when the movable contact 2a is located at the open position, the lower end of the movable contact is matched with the arc ignition protrusion relatively. Specifically, as shown in fig. 1, the lower arc striking plate left portion 10 and the lower arc striking plate right portion 11 are respectively located at the left portion and the right portion of the lower arc striking plate 1, the left end of the lower arc striking plate left portion 10 is disposed at the lower side of the arc extinguishing chamber 4, the right end of the lower arc striking plate left portion 10 is connected with the left end of the lower arc striking plate right portion 11 to form an arc striking protrusion, the arc striking protrusion protrudes upward (in the direction of the movable contact 2a), the right end of the lower arc striking plate right portion 11 is connected with the overload protection device of the miniature circuit breaker, and when the movable contact 2a is located at an opening position, the lower end of the movable contact 2a is located above the arc striking protrusion and is relatively matched with the arc striking protrusion. The utility model discloses a miniature circuit breaker, when its moving/static contact divides the branch to divide and produces electric arc, supplementary striking plate 3 and lower striking plate 1 form the U-shaped return circuit, make electric arc receive the magnetic blow effect to remove rapidly, and electric arc gets into explosion chamber 4 with higher speed, is favorable to improving arc extinguishing efficiency. Further, the overload protection device is a bimetallic strip.
Preferably, the lower arc striking plate 1 is of an integrated structure and is formed by stamping and bending a metal plate.
As shown in fig. 3, it is an embodiment of the auxiliary arc ignition plate 3 of the present invention.
As shown in fig. 3, the auxiliary arc ignition plate 3 includes an arc ignition plate main plate 30 and a second protrusion 31, and the second protrusion 31 is disposed at one end of the arc ignition plate main plate 30 and is located on an axis of the arc ignition plate main plate 30. Further, as shown in fig. 3, the second protrusion 31 is a long strip structure and extends along the axial direction of the main plate 30 of the arc ignition plate. Further, the length of the second protrusion 31 is greater than or equal to the length 1/2 of the arc ignition plate main plate 30.
As shown in fig. 2, an embodiment of a stationary contact 2b of the present invention is shown.
As shown in fig. 2, the static contact 2b includes a connecting plate 20b, a contact mounting plate 21b, and a static contact arc-striking angle 232b, one side of the contact mounting plate 21b is provided with a static contact, the static contact arc-striking angle 232b includes a first arc-striking angle portion 22b and a second arc-striking angle portion 23b which are connected with each other in a bending manner, one end of the connecting plate 20b is connected with the short circuit trip device 5 of the miniature circuit breaker, the other end of the connecting plate is connected with one end of the contact mounting plate 21b in a bending manner, the other end of the contact mounting plate 21b is connected with the first arc-striking angle portion 22b, the connection between the contact mounting plate 21b and the first arc-striking angle portion 22b is an arc-shaped structure, the other end of the first arc-striking angle portion 22b is connected with the second arc-striking angle portion 23b, the connecting plate 20b and the first arc-striking angle portion 22b are integrally formed into a U-shaped structure, the first projection 24b, the arc ignition angle second portion 23b is disposed in parallel with the connection plate 20 b. Further, the connecting plate 20b, the static contact mounting plate 21b and the static contact arc-striking angle 232b are integrally formed into a fishhook-shaped structure. Further, one end of the contact mounting plate 21b is electrically connected to a trip coil of the short circuit trip device 5.
As shown in fig. 1-3, the utility model discloses a miniature circuit breaker still includes operating device, short circuit trip gear 5 and overload trip gear, operating device includes the handle, the connecting rod, the rotor plate, the contact supports, the hasp, jump and detain, the contact supports and links to each other with moving contact 2a upper end, short circuit trip gear 5 includes trip coil, a coil support and the ejector pin of setting at the coil support middle part for supporting trip coil, trip coil links to each other with static contact 2 b's connecting plate 20b, overload trip gear is the bimetallic strip, bimetallic strip one end links to each other with lower run-on plate right part 11 one end of lower run-on plate 1. Specifically, as shown in fig. 1, the short circuit trip device 5 is disposed above the fixed contact 2b, the operating mechanism is disposed on the right side of the short circuit trip device 5 and located above the lower arc starting plate 1, the overload trip device is disposed on the right side of the lower arc starting plate 1, and the lower end of the overload trip device is connected to the lower end of the right portion 11 of the lower arc starting plate.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (10)
1. A miniature circuit breaker comprises a lower arc striking plate (1), a movable contact (2a), a fixed contact (2b) and an arc extinguishing chamber (4), wherein the movable contact (2a) and the fixed contact (2b) are arranged oppositely, the arc extinguishing chamber (4) is arranged between the fixed contact (2b) and the lower arc striking plate (1), an arc striking channel (A) is formed between the fixed contact (2b) and the lower arc striking plate (1), and an arc inlet of the arc extinguishing chamber (4) is connected with the arc striking channel (A);
the method is characterized in that: the auxiliary arc striking plate (3) is electrically connected with the static contact (2 b); the static contact (2b) comprises a static contact arc striking angle (232b), the static contact arc striking angle (232b) comprises a first bending arc striking angle part (22b) and a second bending arc striking angle part (23b), the first bending arc striking angle part (22b) is connected with the second bending arc striking angle part (23b), one end of the second bending arc striking angle part (23b) and one end of the lower arc striking plate (1) are respectively arranged on two sides of the arc extinguishing chamber (4), and the auxiliary arc striking plate (3) is arranged between the second bending arc striking angle part (23b) and the arc extinguishing chamber (4).
2. A miniature circuit breaker according to claim 1, wherein: the auxiliary arc ignition plate (3) comprises an arc ignition plate main plate (30), and the distance between the arc ignition plate main plate (30) and the arc extinguish chamber (4) is 1-4 mm.
3. A miniature circuit breaker according to claim 1, wherein: the width of the auxiliary arc ignition plate (3) is larger than that of the second part (23b) of the arc ignition angle.
4. A miniature circuit breaker according to claim 2 or 3, wherein: the auxiliary arc ignition plate (3) comprises a second protrusion (31) arranged at one end of an arc ignition plate main plate (30) of the auxiliary arc ignition plate (3), and the distance D2 between the second protrusion (31) and the connection part of the first arc ignition angle part (22b) and the second arc ignition angle part (23b) is 1-6 mm; the joint of the first arc ignition angle part (22b) and the second arc ignition angle part (23b) is matched with an arc inlet of the arc extinguishing chamber (4).
5. A miniature circuit breaker according to claim 4, wherein: run-on angle second portion (23b) and explosion chamber (4) parallel arrangement, run-on angle second portion (23b) serve with the one that run-on angle first portion (22b) link to each other and be equipped with to supplementary run-on plate (3) prominent first arch (24b), first arch (24b) link to each other with the protruding (31) contact of second.
6. A miniature circuit breaker according to claim 1, wherein: the auxiliary arc ignition plate (3) comprises an arc ignition plate main plate (30) and a second protrusion (31), wherein the second protrusion (31) is arranged at one end of the arc ignition plate main plate (30) and is positioned on the axis of the arc ignition plate main plate (30).
7. A miniature circuit breaker according to claim 6, wherein: the second protrusion (31) is of a long strip-shaped structure and extends along the axial direction of the arc ignition plate main plate (30), and the length of the second protrusion (31) is greater than or equal to the length of 1/2 of the arc ignition plate main plate (30).
8. A miniature circuit breaker according to claim 1, wherein: lower striking board (1) is herringbone structure, including lower striking board left part (10) and lower striking board right part (11), lower striking board left part (10) one end links to each other with lower striking board right part (11) one end and forms the striking arch, the striking arch is protruding to moving contact (2a) place direction, lower striking board left part (10) other end sets up in explosion chamber (4) one side, be formed with between lower striking board left part (10) and static contact (2b) striking passageway (A), when moving contact (2a) are in the open position, its lower extreme and the protruding relative cooperation of striking.
9. A miniature circuit breaker according to claim 8, wherein: the other end of the right part (11) of the lower arc striking plate is connected with an overload protection device of the miniature circuit breaker.
10. A miniature circuit breaker according to claim 1, wherein: the static contact (2b) comprises a static contact, a connecting plate (20b), a contact mounting plate (21b) and a static contact arc striking angle (232b), the static contact is arranged on one side of the contact mounting plate (21b), one end of the connecting plate (20b) is connected with a short circuit tripping device (5) of the miniature circuit breaker, the other end of the connecting plate is connected with one end of the contact mounting plate (21b) in a bending mode, the other end of the contact mounting plate (21b) is connected with one end of a first arc striking angle part (22b), the joint of the contact mounting plate (21b) and the first arc striking angle part (22b) is of an arc-shaped structure, the other end of the first arc striking angle part (22b) is connected with a second arc striking angle part (23b), the connecting plate (20b), the contact mounting plate (21b) and the first arc striking angle part (22b) are integrally of a U-shaped structure, and a first bulge (24b) is arranged at one end, connected with the second arc striking angle part (23, the arc ignition angle second part (23b) is arranged in parallel with the connecting plate (20 b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042590.9U CN210223923U (en) | 2019-07-05 | 2019-07-05 | Small-sized circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042590.9U CN210223923U (en) | 2019-07-05 | 2019-07-05 | Small-sized circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210223923U true CN210223923U (en) | 2020-03-31 |
Family
ID=69936122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921042590.9U Active CN210223923U (en) | 2019-07-05 | 2019-07-05 | Small-sized circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210223923U (en) |
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2019
- 2019-07-05 CN CN201921042590.9U patent/CN210223923U/en active Active
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