An insulating structure of a circuit breaker

Abstract

The application discloses an insulation structure of a circuit breaker, which comprises an operating mechanism, a first shaft close to one side of a moving contact, a support fixed by the first shaft, an insulation piece connected with the first shaft, and a second contact surface provided on the side of the moving contact close to the first shaft. When the circuit breaker bears a short-circuit current, the moving contact is repelled under the action of an electric repulsive force, and the first contact surface abuts against the second contact surface. When a short circuit occurs, the moving contact moves rapidly under the action of the electric repulsive force, and at this time, the moving contact abuts against the insulation piece, the insulation piece is located between the first shaft and the moving contact, and an electric isolation effect is formed. In addition, the first contact surface abuts against the second contact surface, a surface contact effect is formed, the stress area is increased, the stress is dispersed, and the moving contact does not deform.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically to an insulation structure for a circuit breaker. Background Technology

[0002] A circuit breaker, specifically a molded case circuit breaker, is typically a three-phase circuit breaker, consisting of phases A, B, and C, with phase B located between phases A and C. In existing technology, the operating mechanism of the circuit breaker is mounted above phase B. The operating mechanism drives a rotating shaft (with a moving contact blade fixed to the shaft, and a moving contact at the end of the moving contact blade) to rotate, thereby achieving synchronous operation of the three phases (i.e., synchronous closing or synchronous opening).

[0003] The operating mechanism includes two supports and multiple fixed shafts connecting the two supports, forming a single unit. When the circuit breaker is subjected to a short-circuit current, the moving contact blades are repelled by electric repulsion. At this time, the fixed shafts near the moving contact will come into contact with the moving contact blades (in normal opening and closing states, the moving contact blades will not move to the point of contacting the fixed shafts). This leads to two problems: First, since the fixed shaft is made of conductive metal, when the moving contact blades come into contact with the fixed shafts, a conductive effect is created, causing the entire operating mechanism to become energized. Second, the contact between the moving contact blades of phase B and the fixed shafts can easily cause deformation or even bending of the moving contact blades, severely affecting the subsequent operation of the entire circuit breaker. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this invention is how to handle the generation of electrodynamic repulsion. An insulation structure for a circuit breaker includes: The operating mechanism includes two supports and a first shaft near the moving contact, with both ends of the first shaft connected and fixed to the two supports respectively. An insulating component is connected and fixed to the first shaft, and the insulating component is provided with a first contact surface; A moving contact blade, wherein the moving contact blade has a second contact surface on the side facing the first axis; When the circuit breaker is subjected to a short-circuit current, the moving contact blade is repelled by the electric repulsive force, and the first contact surface abuts against the second contact surface.

[0005] The insulating component also includes an extension portion, which has a third contact surface. When the circuit breaker is subjected to a short-circuit current, the moving contact blade is repelled by an electric repulsive force. The moving contact blade has a fourth contact surface, and the third contact surface abuts against the fourth contact surface.

[0006] The insulating component includes a first fixing part and a second fixing part, the extension part connects the first fixing part and the second fixing part, the first contact surface is disposed on the first fixing part, the operating mechanism further includes a second shaft that cooperates with the jump buckle, and the second fixing part is connected to the second shaft.

[0007] The second axis is located on the side of the first axis away from the moving contact.

[0008] The first fixing part has a first notch, and the first shaft passes through the first notch. The second fixing part has a second notch, and the second shaft passes through the second notch.

[0009] The first notch includes a first opening segment and a first shaft-fitting segment, the size of which matches the size of the first shaft, and the size of which is larger than the size of the first opening segment; or, the second notch includes a second opening segment and a second shaft-fitting segment, the size of which matches the size of the second shaft, and the size of which is larger than the size of the second opening segment.

[0010] The orientation of the first notch is different from that of the second notch.

[0011] The moving contact blade has a protrusion, and the second contact surface is disposed on the protrusion. The protrusion also includes a tip and a first support surface. The two sides of the tip are respectively connected to the second contact surface and the first support surface, and the first support surface is located on the side closer to the moving contact.

[0012] It also includes insulation and soft copper wire. The insulation cover is located on the side of the bracket away from the moving contact. The insulation cover is connected and fixed to the bracket. The soft copper wire is connected to the moving contact blade. The insulation cover is located between the bracket and the soft copper wire.

[0013] One of the insulating cover and the bracket is provided with a buckle, and the other of the insulating cover and the bracket is provided with a slot that cooperates with the buckle.

[0014] It also includes a base, the base having a limiting groove, and the insulating cover having a limiting part that extends into the limiting groove.

[0015] The technical solution of this invention has the following advantages: 1. The present invention provides an insulation structure for a circuit breaker. By setting the insulating component, when a short circuit occurs, the moving contact blade moves rapidly under the action of electric repulsion. At this time, the moving contact blade abuts against the insulating component, and the insulating component is located between the first shaft and the moving contact blade, forming an electrical isolation effect. Secondly, the first contact surface and the second contact surface are in contact, forming a surface contact effect, which can increase the force-bearing area, change the force direction, and disperse the impact force, so that the moving contact blade will not deform.

[0016] 2. The insulation structure of the circuit breaker provided by the present invention adopts the setting of an extension portion to further increase the contact area, distribute the force, and prevent the moving contact blade from deforming.

[0017] 3. The insulation structure of the circuit breaker provided by the present invention further improves the stability of the insulation component by fixing it with two shafts, and secondly, improves the strength of the insulation component fixing. By dispersing the force through the two shafts, it further prevents the moving contact blade from deforming and also prevents the insulation component from being directly broken.

[0018] 4. The insulation structure of the circuit breaker provided by this invention achieves rapid installation through a notch structure. Here, the second fixing part can be connected to the second shaft first, and then the first fixing part can be connected and fixed to the first shaft by rotating the insulating member. Alternatively, the first fixing part can be connected to the first shaft, and then the connection between the second shaft and the second fixing part can be formed by rotating the insulating member. Furthermore, the first and second fixing parts can also be hole structures, allowing the insulating member to be installed and fixed simultaneously during the installation of the operating mechanism.

[0019] 5. The present invention provides an insulation structure for a circuit breaker, wherein the protrusion increases strength and the contact area between the first contact surface and the second contact surface, changes the direction of force, disperses the impact force, and prevents the moving contact blade from deforming.

[0020] 6. The insulation structure of the circuit breaker provided by the present invention forms an insulation isolation effect between the soft copper wire and the support by setting the insulation cover. Moreover, the use of the insulation cover can eliminate the need for the installation of the insulation sleeve, improve the insulation performance and improve the assembly efficiency.

[0021] 7. The present invention provides an insulation structure for a circuit breaker, wherein the cooperation of the snap and the slot achieves the connection and fixation effect between the insulation cover and the bracket. In addition, other fixing methods can also be used, such as gluing, injection molding or other fixing methods.

[0022] 8. The insulation structure of the circuit breaker provided by the present invention, with the setting of the limiting groove, forms a multi-directional fixing effect, prevents the insulation cover from shifting, and improves the overall fixing effect. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A cross-sectional view of the insulation structure of a circuit breaker provided by the present invention; Figure 2 A cross-sectional view of the insulation structure of a circuit breaker under short-circuit conditions provided by the present invention; Figure 3 A partial structural diagram of the insulation structure of a circuit breaker provided by the present invention; Figure 4 for Figure 3 A sectional view; Figure 5 A schematic diagram illustrating the structure of the bracket, first shaft, second shaft, and insulating component provided by the present invention. Figure 6 This is a schematic diagram of the structure of the moving contact blade provided by the present invention; Figure 7 This is a schematic diagram of the structure of the insulating component provided by the present invention; Figure 8 A side view of the insulating component provided by the present invention; Figure 9 This is a schematic diagram of the structure of the insulating cover provided by the present invention.

[0025] Explanation of reference numerals in the attached figures: 11. Bracket; 12. Moving contact blade; 13. First shaft; 14. Insulating component; 15. Second shaft; 16. Insulating cover; 17. Buckle; 18. Slot; 19. Base; 121. Moving contact; 122. Second contact surface; 123. Fourth contact surface; 124. Protrusion; 125. Tip; 126. First support surface; 141. First contact surface; 142. Extension; 143. Third contact surface; 144. First fixing part; 145. Second fixing part; 161. Limiting part; 191. Limiting groove; 1441. First notch; 1442. First opening section; 1443. First shaft mating section; 1451. Second notch; 1452. Second opening section; 1453. Second shaft mating section. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1 This embodiment provides an insulation structure for a circuit breaker, as shown in the attached figure. Figures 1-9 As shown, including, The operating mechanism includes two supports 11 and a first shaft 13 near the moving contact 121. The two supports 11 are arranged in parallel, and both ends of the first shaft 13 are connected to the two supports 11 respectively, forming a connection and fixing effect of the supports 11, thus forming a whole. In addition, the supports 11 are also connected by shafts at other positions to form a fixed effect of the supports 11 as a whole. This is prior art, so it will not be described in detail in this embodiment. The first shaft 13 is prior art, and its position is constant. If the position of the first shaft 13 is modified, the entire operating mechanism needs to be adjusted, which will affect the structure of the entire circuit breaker and cause waste of inventory parts. In order to reduce production costs, this embodiment is an improvement based on the prior art. It should also be noted that the operating mechanism also includes a trip latch, a locking latch, a lever, a re-latch, etc. The operating mechanism drives the rotating shaft (the rotating shaft is fixed with the moving contact 121) through a linkage structure. This is also prior art.

[0031] An insulating component 14 is connected and fixed to the first shaft 13. The insulating component 14 can either adhere to or cover the first shaft 13. The insulating component 14 has a first contact surface 141.

[0032] The moving contact 12 has a second contact surface 122 on the side facing the first shaft 13. In addition, it should be noted that one end of the moving contact 12 is engaged with the rotating shaft. When the rotating shaft rotates, the rotating shaft drives the moving contact 12 to rotate. The other end of the moving contact 12 is provided with a moving contact 121, which is engaged with the stationary contact.

[0033] Under normal conditions, the first contact surface 141 and the second contact surface 122 will not come into contact, meaning the moving contact 12 and the insulating component 14 will not abut against each other. When the circuit breaker is subjected to a short-circuit current (i.e., when a short-circuit fault occurs in the circuit), the moving contact 12 is repelled by the electric repulsive force. At this time, the electric repulsive force is much greater than the normal opening and closing force, and the first contact surface 141 and the second contact surface 122 abut against each other. This abutment is a surface abutment, which can be the contact between curved surfaces, the contact between flat surfaces, or the contact between surfaces of other structures. With the insulator 14, when a short circuit occurs, the moving contact 12 moves rapidly under the action of electric repulsion. At this time, the moving contact 12 abuts against the insulator 14, and the insulator 14 is located between the first shaft 13 and the moving contact 12, forming an electrical isolation effect. Secondly, the first contact surface 141 and the second contact surface 122 are in contact, forming a surface contact effect, which can increase the force-bearing area, change the force direction, and disperse the force, so that the moving contact 12 will not deform.

[0034] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8As shown, the insulating member 14 also includes an extension 142. This extension 142 can extend towards the moving contact 121 or away from it, depending on the specific requirements of those skilled in the art. The extension 142 has a third contact surface 143. When the circuit breaker is subjected to a short-circuit current, the moving contact 12 is repelled by an electric repulsive force. The moving contact 12 has a fourth contact surface 123, and the third contact surface 143 abuts against the fourth contact surface 123. When the first contact surface 141 abuts against the second contact surface 122, the third contact surface 143 abuts against the fourth contact surface 123 simultaneously; or, after the first contact surface 141 abuts against the second contact surface 122, the insulating member 14 undergoes slight deformation (i.e., the moving contact 12 applies pressure to the insulating member 14, causing it to deform under pressure). At this time, the third contact surface 143 abuts against the fourth contact surface 123, forming a stepped pressure distribution, thereby increasing the subsequent contact area and dispersing the force. The extension 142 is provided to further increase the contact area, distribute the force, and prevent the moving contact blade 12 from deforming.

[0035] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8 As shown, the insulating component 14 includes a first fixing part 144 and a second fixing part 145. An extension part 142 connects the first fixing part 144 and the second fixing part 145. A first contact surface 141 is disposed on the first fixing part 144, and the first fixing part 144 is connected and fixed to the first shaft 13. The operating mechanism also includes a second shaft 15 that cooperates with the jump buckle. Specifically, the jump buckle is sleeved on the second shaft 15 and rotates relative to the second shaft 15. The second fixing part 145 is connected to the second shaft 15. Here, the first shaft 13 and the second shaft 15 can be arranged in parallel or spatially staggered. In this embodiment, the parallel arrangement of the first shaft 13 and the second shaft 15 is used as an example for description. By fixing the two shafts, the stability of the insulating component 14 is further improved, and secondly, the strength of the insulating component 14 is improved. By dispersing the force through the two shafts, the first shaft 13 and the second shaft 15 are both stress points, thus dispersing the force and further preventing deformation of the moving contact blade 12 and preventing the insulating component 14 from being directly broken.

[0036] Specifically, as shown in the attached document Figures 1-3 As shown, the second axis 15 is located on the side of the first axis 13 away from the moving contact 121. Alternatively, the second axis 15 can also be located above the first axis 13. It should be noted that when the moving contact 12 is under the action of electro-repulsive force, the moving contact 12 is in contact with the insulating member 14 at the position of the first axis 13; the moving contact 12 will not move to the position of the second axis 15, nor will it contact the second axis 15.

[0037] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8As shown, the first fixing part 144 has a first notch 1441 and a cavity that extends axially through the shaft. The first notch 1441 is located in the radial direction of the cavity. When the first shaft 13 is fitted with the first fixing part 144, it can be installed by lateral sleeve, thereby achieving the connection and fixation between the first shaft 13 and the first fixing part 144. The second fixing part 145 has a second notch 1451. The structure of the second fixing part 145 is the same as that of the first fixing part 144. It also has a cavity that extends axially through the shaft. The second notch 1451 is located in the radial direction of the cavity. The second shaft 15 passes through the second notch 1451, achieving the fixation effect between the second shaft 15 and the second fixing part 145. The notch structure allows for rapid installation. Here, the second fixing part 145 can be connected to the second shaft 15 first, and then the first fixing part 144 can be connected and fixed to the first shaft 13 by rotating the insulating member 14. Alternatively, the first fixing part 144 can be connected to the first shaft 13, and then the connection between the second shaft 15 and the second fixing part 145 can be formed by rotating the insulating member 14. In this embodiment, when both ends of the second shaft 15 are connected and fixed to the bracket 11, they simultaneously pass through the second fixing part 145. That is, the second shaft 15 passes through one bracket 11, then through the second fixing part 145, and finally through the other bracket 11 to achieve the connection and fixation effect. At this time, the insulating member 14 rotates relative to the second shaft 15. The operator only needs to rotate the insulating member 14 to allow the first shaft 13 to pass through the first notch 1441 and enter the cavity of the first fixing part 144, thereby achieving the connection and fixation effect of the insulating member 14. Alternatively, the first fixing part 144 and the second fixing part 145 can also be a hole structure, completing the installation and fixation of the insulating member 14 during the installation of the operating mechanism. Alternatively, one part can be a hole structure, and the other can be a lateral sleeve installation. For example, when the second shaft 15 is installed in the operating mechanism, the second fixing part 145 passes through one of the brackets 11, the second fixing part 145, and the other bracket 11, thereby achieving a fixing effect. In this case, the insulating member 14 is fixed at one end, and then by rotating the insulating member 14, the first fixing part 144 is connected to the first shaft 13, forming a fixed effect for the entire insulating member 14.

[0038] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8As shown, the first notch 1441 includes a first opening section 1442 and a first shaft-fitting section 1443. The size of the first shaft-fitting section 1443 matches the size of the first shaft 13, and the size of the first shaft-fitting section 1443 is larger than the size of the first opening section 1442, forming a small opening and a large interior, preventing the first shaft 13 from dislodging from the cavity of the first fixing part 144. Alternatively, the second notch 1451 includes a second opening section 1452 and a second shaft-fitting section 1453. The size of the second shaft-fitting section 1453 matches the size of the second shaft 15, and the size of the second shaft-fitting section 1453 is larger than the size of the second opening section 1452, forming a small opening and a large interior, preventing the second shaft 15 from dislodging from the cavity of the second fixing part 145.

[0039] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8 As shown, the orientation of the first notch 1441 is different from that of the second notch 1451. The different orientations create a mutually restraining effect, increasing the strength of the insulating member 14 and preventing the passive contact 12 from breaking.

[0040] Specifically, as shown in the attached document Figures 1-2 , Figures 7-8 As shown, the second notch 1451 is used to avoid the lower link of the operating mechanism, thus achieving the effect of giving way.

[0041] Specifically, as shown in the attached document Figures 1-2 , Figure 6 As shown, the moving contact 12 has a protrusion 124, and a second contact surface 122 is disposed on the protrusion 124. The protrusion 124 also includes a tip 125 and a first support surface 126. The two sides of the tip 125 are respectively connected to the second contact surface 122 and the first support surface 126. The first support surface 126 is located on the side closer to the moving contact 121. The protrusion 124 increases the strength and the contact area between the first contact surface 141 and the second contact surface 122, changes the direction of force, and disperses the impact force, so that the moving contact will not deform. Furthermore, the tip 125 is arc-shaped.

[0042] Specifically, as shown in the attached document Figures 1-2 , Figure 6 As shown, the first contact surface 141 is an arc surface, and the second contact surface 122 is also an arc surface. By fitting the arc surfaces together, the contact area is increased, thereby dispersing the force.

[0043] Specifically, as shown in the attached document Figures 1-4 , Figure 9As shown, the assembly also includes an insulating cover 16 and a flexible copper wire. The insulating cover 16 is located on the side of the bracket 11 away from the moving contact 121. One side of the bracket 11 is close to the moving contact 121, and the other side is away from the moving contact 121. Here, the insulating cover 16 is located on the side away from the moving contact 121. The insulating cover 16 is connected and fixed to the bracket 11. This connection and fixation can be a snap-fit ​​connection, an adhesive connection, or other connection methods. One end of the flexible copper wire is electrically connected to the moving contact blade 12, and the other end of the flexible copper wire is electrically connected to the bimetallic component and the terminal. Here, the flexible copper wire is existing technology. The insulating cover 16 is located between the flexible copper wire and the bracket 11, forming an insulating isolation effect between the flexible copper wire and the bracket. Moreover, by using the insulating cover 16, the use of an insulating sleeve can be eliminated (in existing technology, the insulating sleeve is placed on the flexible copper wire), improving insulation performance and assembly efficiency. Here, the insulating cover 16 is made of plastic or other insulating materials, which can be adjusted by those skilled in the art according to actual needs.

[0044] Specifically, as shown in the attached document Figures 1-4 , Figure 9 As shown, one of the insulating cover 16 and the bracket 11 is provided with a buckle 17, and the other of the insulating cover 16 and the bracket 11 is provided with a groove 18 that mates with the buckle 17. The engagement of the buckle 17 and the groove 18 achieves the connection and fixation effect between the insulating cover 16 and the bracket 11. When the insulating cover 16 is provided with the buckle 17, the bracket 11 is provided with the groove 18; conversely, when the insulating cover 16 is provided with the groove 18, the bracket 11 is provided with the buckle 17. In this embodiment, the example of the insulating cover 16 being provided with the buckle 17 and the bracket 11 being provided with the groove 18 is described. Here, the buckle 17 is located on the side of the insulating cover 16 facing the moving contact 121, thus fixing the insulating cover 16 in the length and height directions of the bracket 11. In addition, other fixing methods can also be used, such as gluing, injection molding, or other fixing methods.

[0045] Specifically, as shown in the attached document Figures 1-4 , Figure 9 As shown, the insulating cover 16 has a U-shaped structure, including two sides and a bottom surface. The two sides are connected to the bracket 11 by snap-fit, and the bottom surface is attached to the base 19 to further increase the insulation area, improve the insulation effect, and prevent electrical connection between the soft copper wire and the bracket 11.

[0046] Specifically, as shown in the attached document Figures 1-4 , Figure 9As shown, the system also includes a base 19, which has a limiting groove 191, and an insulating cover 16 has a limiting part 161 that extends into the limiting groove 191. In this embodiment, the limiting part 161 is inserted into the limiting groove 191 along the height direction of the bracket 11, achieving a multi-directional limiting and fixing effect. The setting of the limiting groove 191 forms a multi-directional fixing effect, preventing the insulating cover 16 from shifting and improving the overall fixing effect.

[0047] Specifically, the insulating component 14 and the insulating cover 16 are both fixed in the chamber where phase B of the circuit breaker is located.

[0048] Specifically, the insulating element 14 is made of plastic, but it can also be made of other insulating materials, such as rubber. In addition, the insulating element 14 has a certain degree of elastic deformation (both plastic and rubber have the property of elastic deformation), forming a cushioning effect.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An insulation structure for a circuit breaker, characterized in that, include: The operating mechanism includes two supports (11) and a first shaft (13) near the moving contact (121), with the two ends of the first shaft (13) respectively connected and fixed to the two supports (11); An insulating component (14) is connected and fixed to the first shaft (13), and the insulating component (14) is provided with a first contact surface (141); A movable contact blade (12) is provided with a second contact surface (122) on the side facing the first shaft (13); When the circuit breaker is subjected to a short-circuit current, the moving contact (12) is repelled by the electric repulsion force, and the first contact surface (141) abuts against the second contact surface (122).

2. The insulation structure of the circuit breaker according to claim 1, characterized in that, The insulating component (14) further includes an extension (142), which has a third contact surface (143). When the circuit breaker is subjected to a short-circuit current, the moving contact (12) is repelled by the electric repulsion force. The moving contact (12) has a fourth contact surface (123), and the third contact surface (143) abuts against the fourth contact surface (123).

3. The insulation structure of the circuit breaker according to claim 2, characterized in that, The insulating component (14) includes a first fixing part (144) and a second fixing part (145). The extension part (142) connects the first fixing part (144) and the second fixing part (145). The first contact surface (141) is disposed on the first fixing part (144). The operating mechanism also includes a second shaft (15) that cooperates with the jump buckle. The second fixing part (145) is connected to the second shaft (15).

4. The insulation structure of the circuit breaker according to claim 3, characterized in that, The first fixing part (144) has a first notch (1441) through which the first shaft (13) passes. The second fixing part (145) has a second notch (1451) through which the second shaft (15) passes.

5. The insulation structure of the circuit breaker according to claim 4, characterized in that, The first notch (1441) includes a first opening segment (1442) and a first shaft-fitting segment (1443), the size of the first shaft-fitting segment (1443) matches the size of the first shaft (13), and the size of the first shaft-fitting segment (1443) is larger than the size of the first opening segment (1442); or, the second notch (1451) includes a second opening segment (1452) and a second shaft-fitting segment (1453), the size of the second shaft-fitting segment (1453) matches the size of the second shaft (15), and the size of the second shaft-fitting segment (1453) is larger than the size of the second opening segment (1452).

6. The insulation structure of the circuit breaker according to claim 4 or 5, characterized in that, The orientation of the first notch (1441) is different from that of the second notch (1451).

7. The insulation structure of the circuit breaker according to claim 1, characterized in that, The moving contact blade (12) is provided with a protrusion (124), and the second contact surface (122) is disposed on the protrusion (124). The protrusion (124) also includes a tip (125) and a first support surface (126). The two sides of the tip (125) are respectively connected to the second contact surface (122) and the first support surface (126). The first support surface (126) is located on the side close to the moving contact (121).

8. The insulation structure of the circuit breaker according to claim 1, characterized in that, It also includes an insulating cover (16) and a soft copper wire. The insulating cover (16) is located on the side of the bracket (11) away from the moving contact (121). The insulating cover (16) is connected and fixed to the bracket (11). The soft copper wire is connected to the moving contact (12). The insulating cover (16) is located between the bracket (11) and the soft copper wire.

9. The insulation structure of the circuit breaker according to claim 8, characterized in that, One of the insulating cover (16) and the bracket (11) is provided with a buckle (17), and the other of the insulating cover (16) and the bracket (11) is provided with a slot (18) that cooperates with the buckle (17).

10. The insulation structure of the circuit breaker according to claim 8, characterized in that, It also includes a base (19), which is provided with a limiting groove (191), and the insulating cover (16) is provided with a limiting part (161), which extends into the limiting groove (191).

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