Side plate fixing device and circuit breaker

Abstract

The utility model discloses a side plate fixing device relates to circuit breaker spare structure technical field, including fixed main part, and the electric connection subassembly of fixed main part with circuit breaker can be fixedly connected, and fixed main part is parallel to the bottom plate setting of circuit breaker, and the clamping boss and a plurality of screw holes of fixed main part all set up in fixed base, and the side plate of circuit breaker is provided with the clamping hole and the through hole, and the clamping boss can be clamped into the clamping hole, and the screw can pass through the through hole and the screw hole in proper order to fix the connection of side plate and electric connection subassembly, and the length direction of fixed main part is same with the length direction of side plate. The utility model discloses still a kind of circuit breaker, including side plate, electric connection subassembly, base and the side plate fixing device as described above, electric connection subassembly is fixedly arranged in the top of base, and side plate fixing device is fixedly connected with electric connection subassembly, and side plate is fixedly connected with side plate fixing device. The utility model makes side plate and electric connection subassembly connection stability height, is conducive to long -term use.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit breaker component construction, and in particular to a side plate fixing device and a circuit breaker. Background Technology

[0002] Circuit breakers typically consist of a base, electrical connection components, and side plates. The electrical connection components are fixed to the base, and the side plates are located on the sides of the electrical connection components. Currently, the electrical connection components and side plates are commonly connected by screws. While this method meets basic fixing requirements during initial installation, it presents several potential problems during daily use. When the side plate is fixed to a wall or other location, the circuit breaker is subjected to various forces during operation. Firstly, due to the circuit breaker's own weight and the potential for slight vibrations caused by current flow during operation, shear forces are generated between the electrical connection components and the side plates. These shear forces primarily stem from the relative displacement between the two components. The electrical connection components, fixed to the base, are relatively stable, while the side plates, constrained by walls or other fixed locations, experience a force along the tangential direction of the contact surface under vibration or external forces. This force is entirely borne by the screws connecting the two components.

[0003] On the other hand, under certain special circumstances, such as when the circuit breaker is subjected to external impact, has a slight displacement in its installation position, or experiences a sudden large current in the circuit causing an impact force inside the circuit breaker, a tensile force will also be generated between the electrical connection assembly and the side plate. The tensile force manifests as a tendency for the electrical connection assembly and the side plate to separate from each other. In this case, the screw needs to withstand a tensile force along its own axis to resist this separation tendency.

[0004] Therefore, the screws connecting the electrical components to the side plates must withstand both shear and tensile forces during daily use. However, as a metal connector, the screw material itself has certain mechanical performance limits. Under prolonged dual stress, fatigue damage will gradually occur inside the screw. Each stress application accumulates small stress concentrations inside the screw, and over time, these stress concentration points expand, causing the screw's mechanical strength to gradually decrease. When the force on the screw exceeds its fatigue limit, connection failures such as thread stripping and screw breakage will occur. Once a connection failure occurs, it will seriously affect the normal operation of the circuit breaker.

[0005] Therefore, there is an urgent need for a side plate fixing device and a circuit breaker to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to provide a side plate fixing device and a circuit breaker to solve the problems existing in the prior art, so as to make the connection highly stable and conducive to long-term use.

[0007] To achieve the above objectives, this utility model provides the following solution:

[0008] This utility model provides a side plate fixing device, including a fixing body. The fixing body can be fixedly connected to the electrical connection assembly of a circuit breaker, and the fixing body is arranged parallel to the bottom plate of the circuit breaker. The fixing body includes a fixing seat, multiple snap-fit ​​protrusions, and multiple screw holes. The multiple snap-fit ​​protrusions and multiple screw holes are all provided on the fixing seat. The side plate of the circuit breaker is provided with snap-fit ​​holes and through holes. The snap-fit ​​protrusions can snap into the snap-fit ​​holes, and the screws can pass through the through holes and the screw holes in sequence to fix the side plate to the electrical connection assembly. The length direction of the fixing body is the same as the length direction of the side plate.

[0009] In some embodiments, the fixing base is a slider, the electrical connection assembly is provided with a sliding groove, the slider is slidably connected to the sliding groove, and the end of the slider is provided with a first threaded hole. The electrical connection assembly is provided with a connecting hole. When the slider slides to the end of the electrical connection assembly, the bolt can pass through the connecting hole and the first threaded hole in sequence to fix the side plate to the electrical connection assembly.

[0010] In some embodiments, grooves are provided on both sides of the slider, the grooves are arranged along the length of the slider, the grooves are T-shaped grooves, and the slider is slidably disposed in the T-shaped grooves.

[0011] In some embodiments, a plurality of fixing bosses are also included, which are fixedly disposed on the fixing base along the length direction of the fixing base. The snap-fit ​​protrusion is fixedly disposed on the fixing boss, and the fixing boss is provided with the screw hole.

[0012] In some embodiments, at least two fixing bosses are provided, and at least one fixing boss is provided at each end of the fixing seat.

[0013] In some embodiments, a first snap-fit ​​protrusion and a first screw hole are provided on the fixing protrusion near the electrical connection component, and a second snap-fit ​​protrusion and two second screw holes are provided on the fixing protrusion away from the electrical connection component, with the second snap-fit ​​protrusion disposed between the two second screw holes.

[0014] In some embodiments, the first snap-fit ​​protrusion is disposed close to the electrical connection assembly, and the first screw hole is disposed away from the electrical connection assembly.

[0015] In some embodiments, the snap-fit ​​protrusion is integrally injection molded with the fixing seat.

[0016] This utility model also provides a circuit breaker, including a side plate, an electrical connection assembly, a base, and a side plate fixing device as described above. The electrical connection assembly is fixedly disposed above the base, the side plate fixing device is fixedly connected to the electrical connection assembly, and the side plate is fixedly connected to the side plate fixing device.

[0017] In some embodiments, a lifting block is provided on the upper part of the side plate, and a receiving groove and a snap-fit ​​groove are formed on the upper part of the side plate. The snap-fit ​​groove is located above the receiving groove, and the lifting block can be disposed in the receiving groove. The lifting block includes a lifting shoulder and a snap-fit ​​part that are fixedly connected. There is a gap between the snap-fit ​​part and the lifting shoulder, and the side plate can extend into the gap. The snap-fit ​​part includes a wedge-shaped block, and the inclined surface of the wedge-shaped block gradually approaches the gap from high to low. The wedge-shaped block can be snapped into the snap-fit ​​groove to realize the connection between the lifting block and the side plate.

[0018] The present invention achieves the following technical advantages over the prior art:

[0019] The fixing seat of the side plate fixing device provided by this utility model is arranged along the length direction of the side plate. The side plate has multiple connection points with the fixing seat along its length, and it employs a dual fixing method using snap-fit ​​protrusions and screws. This dual fixing method creates a multi-dimensional connection constraint between the side plate and the fixing body. After the snap-fit ​​protrusion is engaged in the snap-fit ​​hole, it can mainly bear the shear force, effectively distributing the force on the screw in the shear direction. The screw, connected through the through hole and screw hole, can bear both tensile force and assist in bearing some of the shear force. This collaborative force-bearing mode can significantly reduce the load on a single connection structure (such as using only screws), avoiding problems such as deformation and breakage of the screw due to long-term excessive shear force, and significantly improving the stability and service life of the connection between the side plate and the electrical connection assembly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the side plate installation completed in some embodiments of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the fixed body installed on the electrical connection assembly in some embodiments of this utility model;

[0023] Figure 3This is a schematic diagram of the structure of the fixing body in some embodiments of this utility model;

[0024] Figure 4 This is a schematic diagram of the side plate structure in some embodiments of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure after the side plate is installed (electrical connection components omitted) in some embodiments of this utility model;

[0026] Figure 6 This is a schematic diagram of the first angle of the lifting block in some embodiments of this utility model;

[0027] Figure 7 This is a schematic diagram of the second angle of the lifting block in some embodiments of this utility model;

[0028] Figure 8 This is a detailed view of the connection between the lifting block and the side plate in some embodiments of this utility model.

[0029] In the diagram: 1-Base; 2-Electrical connection assembly; 3-Side plate; 31-Snap-fit ​​groove; 32-Receiving groove; 33-Through hole; 34-Snap-fit ​​hole; 4-Fixing body; 41-Snap-fit ​​protrusion; 411-First snap-fit ​​protrusion; 412-Second snap-fit ​​protrusion; 42-Fixing boss; 43-Screw hole; 431-First screw hole; 432-Second screw hole; 44-Groove; 45-First threaded hole; 5-Screw; 6-Lifting block; 61-Lifting shoulder; 62-Snap-fit ​​part; 621-Wedge block; 7-Connecting hole. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The purpose of this utility model is to provide a side plate fixing device and a circuit breaker to solve the problems existing in the prior art, so as to make the connection highly stable and conducive to long-term use.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-8As shown, this utility model provides a side plate fixing device, including a fixing body 4. The fixing body 4 can be fixedly connected to the electrical connection assembly 2 of the circuit breaker, and the fixing body 4 is arranged parallel to the bottom plate of the circuit breaker. The fixing body 4 includes a fixing seat, multiple snap-fit ​​protrusions 41 and multiple screw holes 43. The multiple snap-fit ​​protrusions 41 and multiple screw holes 43 are all arranged on the fixing seat. The side plate 3 of the circuit breaker is provided with snap-fit ​​holes 34 and through holes 33. The snap-fit ​​protrusions 41 can snap into the snap-fit ​​holes 34, and the screws 5 can pass through the through holes 33 and screw holes 43 in sequence to fix the side plate 3 to the electrical connection assembly 2. The length direction of the fixing body 4 is the same as the length direction of the side plate 3, that is, the fixing seat is arranged along the length direction of the side plate 3. There are multiple connection points between the side plate 3 and the fixing seat in the length direction, and the double fixing is achieved by snap-fit ​​protrusions 41 and screws 5. The double fixing of snap-fit ​​protrusions 41 and screws 5 forms a multi-dimensional connection constraint between the side plate 3 and the fixing body 4. After the snap-fit ​​protrusion 41 snaps into the snap-fit ​​hole 34, it can mainly bear the shear force and effectively share the force of the screw 5 in the shear direction. The screw 5 is connected through the through hole 33 and the screw hole 43, which can bear the tensile force and also help bear part of the shear force. This division of labor and cooperation in the force-bearing mode can significantly reduce the load of a single connection structure (such as using only screws), avoid problems such as deformation and breakage of the screw 5 due to long-term excessive shear force, and significantly improve the stability and service life of the connection between the side plate 3 and the electrical connection assembly 2.

[0034] Furthermore, the mounting base is arranged along the length of the side plate 3 and is equipped with multiple snap-fit ​​protrusions 41 and screw holes 43, which correspond one-to-one with the snap-fit ​​holes 34 and through holes 33 on the side plate 3. During installation, the side plate 3 and the mounting body 4 can be quickly positioned by engaging the snap-fit ​​protrusions 41 and the snap-fit ​​holes 34, eliminating the need for prolonged manual alignment and reducing adjustment steps during installation. After positioning, screws 5 are then used to secure the mounting base through the corresponding holes. The entire process is simple and efficient, making it particularly suitable for batch assembly scenarios and effectively improving production efficiency.

[0035] In some embodiments, the fixing base is a slider, the electrical connection assembly 2 is provided with a groove, the slider is slidably connected to the groove, and the end of the slider is provided with a first threaded hole 45. The electrical connection assembly 2 is provided with a connecting hole 7. When the slider slides to the end of the electrical connection assembly 2, the bolt can pass through the connecting hole 7 and the first threaded hole 45 in sequence to fix the side plate 3 to the electrical connection assembly 2. The sliding connection between the slider and the groove allows the side plate 3 to be freely adjusted along the length of the electrical connection assembly 2 before fixing, which can flexibly adapt to different installation scenarios (such as when the relative position of the side plate 3 and other components needs to be finely adjusted), or be compatible with the fixing requirements of side plates 3 of different lengths. Compared with the fixed position connection structure, this design greatly reduces the stringent requirements on the machining accuracy of the parts and reduces the assembly difficulties caused by dimensional errors. During installation, the initial position adjustment of the side plate 3 is achieved by sliding the slider in the groove. After sliding to the target position (such as the end of the electrical connection assembly 2), the bolt is then used to fix it through the connecting hole 7 and the first threaded hole 45. During the sliding process, the groove provides a guiding constraint to the slider, preventing the side plate 3 from shifting or wobbling. Combined with the end positioning design, it can quickly find the fixing point and ensure the accuracy of the final fixing position, further simplifying the assembly process and improving installation efficiency.

[0036] In some embodiments, grooves 44 are provided on both sides of the slider, arranged along the length of the slider. The slide is a T-shaped groove, and the slider is slidably disposed within the T-shaped groove. The protruding portions on both sides of the T-shaped groove can be embedded into the grooves 44 on the sides of the slider, forming a fitting guide structure of grooves 44 and protrusions. This provides strict constraint on the lateral displacement of the slider (perpendicular to the sliding direction), preventing the slider from swaying or deviating when sliding within the slide, and ensuring that the sliding process always proceeds smoothly along a preset trajectory. Compared to the combination of a regular rectangular groove and a slider, the combination of a T-shaped groove and a slider with grooves 44 significantly improves guiding accuracy, making it particularly suitable for scenarios requiring high precision in the installation position of the side plate 3. The cross-sectional shape of the T-shaped groove has anti-detachment characteristics, and the protrusions on both sides can form a wrapping constraint from the outside of the slider groove 44. Even when the circuit breaker experiences vibration or impact during operation, or when the slider slides to its limit position, this structure can effectively prevent the slider from accidentally falling out of the slide, avoiding safety hazards such as displacement of the side plate 3 and equipment failure caused by the slider falling out, and providing additional protection for the stable operation of the device. The groove 44 on the side of the slider forms a line contact or a small-area surface contact with the protrusion of the T-slot. Compared with a sliding structure with a large-area contact, this reduces the frictional resistance between the two, making the slider slide more easily and smoothly in the groove, and reducing the operating force during installation or adjustment. At the same time, the groove 44 is arranged along the length of the slider to ensure that the frictional state is consistent throughout the sliding process, avoiding jamming and improving the convenience of position adjustment.

[0037] In some embodiments, the side plate 3 fixing device further includes multiple fixing bosses 42, which are fixedly disposed on the fixing seat along the length direction of the fixing seat. A snap-fit ​​protrusion 41 is fixedly disposed on the fixing bosses 42, and screw holes 43 are provided on the fixing bosses 42. The fixing bosses 42 themselves have a certain height and thickness, providing a more stable bearing base for the snap-fit ​​protrusions. The snap-fit ​​protrusions 41 are fixed on the fixing bosses 42, and compared to being directly disposed on the plane of the fixing seat, their root connection strength is higher, making them less prone to breakage or deformation under shear force, and enabling them to more reliably distribute shear force. The screw holes 43 are provided on the fixing bosses 42, concentrating the force point of the screws 5 when tightened in the boss area. The fixing bosses 42 can disperse the local pressure of the screws 5 on the fixing seat, preventing the fixing seat from denting or cracking due to the tightening of the screws 5, which is especially suitable for scenarios where the fixing seat is thin, ensuring the long-term stability of the screw connection. The fixing bosses 42 are evenly distributed along the length direction, and their top plane can serve as a reference surface for the installation of the side plate 3. When the side plate 3 engages with the fixed boss 42 via the snap-fit ​​protrusion 41, the height of the fixed boss 42 ensures that a stable gap (or tight fit) is formed between the side plate 3 and the fixed seat, avoiding the problem of the side plate 3 being partially suspended or not fitting tightly due to unevenness of the fixed seat surface (such as processing errors or minor deformations), thus making the force transmission of the side plate 3 more uniform.

[0038] In some embodiments, at least two fixing bosses 42 are provided, and at least one fixing boss 42 is provided at each of the two ends of the fixing seat. Preferably, two fixing bosses 42 are provided, located at the two ends of the fixing seat respectively. The two ends of the side plate 3 are usually areas where the force is concentrated (such as the torque generated by its own weight, the transmission of external impact, etc.). By providing fixing bosses 42 at both ends of the fixing seat, the ends of the side plate 3 can be directly and effectively fixed. The snap-fit ​​protrusions and screws are connected to the side plate 3 through the end fixing bosses 42, which can restrain the longitudinal displacement and warping deformation of the side plate 3. It is especially suitable for fixing long side plates 3. Compared with providing multiple fixing bosses 42 along the length direction, providing only two fixing bosses 42 at both ends can reduce the amount of material used. It should be noted that more fixing bosses 42 can be provided depending on the length of the side plate 3 or the requirements of the conditions.

[0039] In some embodiments, a first snap-fit ​​protrusion 411 and a first screw hole 431 are provided on the fixing boss 42 near the electrical connection component 2, and a second snap-fit ​​protrusion 412 and two second screw holes 432 are provided on the fixing boss 42 away from the electrical connection component 2, with the second snap-fit ​​protrusion 412 positioned between the two second screw holes 432. The fixing boss 42 (proximal end) near the electrical connection component 2 is close to the electrical connection component 2 and, influenced by the rigid support of the electrical connection component 2, mainly bears part of the shear force and a small amount of tensile force transmitted by the side plate 3. Therefore, a single snap-fit ​​protrusion (first snap-fit ​​protrusion 411) combined with a single screw hole (first screw hole 431) is sufficient to meet the requirements, simplifying the structure and avoiding resource waste. The fixing boss 42 (farthest end) away from the electrical connection component 2 is the weak point of the side plate 3 under stress. Because it is far from the electrical connection component 2, it is prone to generating a large torque due to the weight of the side plate 3 or vibration, requiring stronger constraints. The double second screw holes 432, together with the middle second snap-fit ​​protrusion 412, form a three-point fixation. This not only disperses the pulling force through the double screws (preventing the single screw from stripping due to excessive force), but also allows the middle snap-fit ​​protrusion to accurately withstand the shear force, making the force on the far end more balanced and effectively resisting warping or deformation.

[0040] In some embodiments, the first snap-fit ​​protrusion 411 is disposed close to the electrical connection assembly 2, and the first screw hole 431 is disposed away from the electrical connection assembly 2. The first snap-fit ​​protrusion 411 close to the electrical connection assembly 2 can directly utilize the rigidity of the electrical connection assembly 2 (the electrical connection assembly 2 itself is connected to the slide / base 1, and has strong stability) to preferentially bear the lateral shear force transmitted by the side plate 3 (such as the horizontal force when the side plate 3 is pushed by an external force). The surface contact characteristics of the snap-fit ​​structure, combined with the support of the electrical connection assembly 2, can quickly transmit the shear force to the electrical connection assembly 2, reducing the risk of deformation of the fixing protrusion 42 itself. The first screw hole 431 away from the electrical connection assembly 2 mainly bears the longitudinal tensile force (such as the outward tensile force generated by the side plate 3 due to its own weight or vibration). At this time, the transmission path of the tensile force is from the side plate 3 to the screw to the fixing protrusion 42 to the slider and finally to the electrical connection assembly 2. The tensile force is dispersed by the thread engagement of the screw, and because the screw hole is away from the electrical connection assembly 2, interference with the slide, bolt and other structures near the electrical connection assembly 2 can be avoided, ensuring that the transmission of tensile force is not hindered. The two work together to form a division of labor between proximal shear resistance and distal tensile resistance, making the force distribution more in line with the laws of mechanical transmission and improving the overall fixation strength.

[0041] In some embodiments, the snap-fit ​​protrusion 41 and the fixing seat are integrally injection molded. Integral injection molding avoids the connection gaps or weak points that may occur in traditional assembly processes (such as welding, bonding, and screw fixing), so that the snap-fit ​​protrusion 41 and the fixing seat form a complete integral structure. The seamless connection greatly enhances the load-bearing capacity of the root of the snap-fit ​​protrusion 41. When subjected to shear force and impact force, the stress can be evenly distributed to the entire fixing seat, rather than concentrated at the connection part, effectively preventing the snap-fit ​​protrusion 41 from breaking or falling off due to excessive force, and extending its service life.

[0042] Example 2

[0043] This utility model also provides a circuit breaker, including a side plate 3, an electrical connection component 2, a base 1, and a side plate 3 fixing device as described in Embodiment 1. The electrical connection component 2 is fixedly disposed above the base 1, and the side plate 3 fixing device is fixedly connected to the electrical connection component 2. The side plate 3 is fixedly connected to the side plate 3 fixing device, resulting in high connection stability and facilitating long-term use.

[0044] It should be noted that when the device is working, the electrical connection component 2 will be subjected to the following... Figure 1 A large electromagnetic force F is applied in the direction shown (perpendicular to the plane of the electrical connection assembly). Support protrusions 21 are provided on the left and right sides of the electrical connection assembly 2, which engage with the snap-fit ​​windows 35 on the side plate 3. The side plate 3 bears the electromagnetic force F received by the electrical connection assembly 2 through the snap-fit ​​windows 35. The fixing body 4 is first fixed to the side plate 3, and the electrical connection assembly 2 is indirectly fixed to the side plate 3 through the connecting hole 7 and the first threaded hole 45. The fixing body 4 bears the electromagnetic force F received by the electrical connection assembly 2 through the connecting hole 7.

[0045] In some embodiments, a support block 6 is provided on the upper part of the side plate 3. The upper part of the side plate 3 has a receiving groove 32 and a snap-fit ​​groove 31. The snap-fit ​​groove 31 is located above the receiving groove 32, and the support block can be disposed in the receiving groove 32. The support block 6 includes a support shoulder 61 and a snap-fit ​​part 62 (preferably integrally formed) that are fixedly connected. The shape of the support shoulder 61 can simulate the shape of finger operation, which conforms to ergonomic design. When manual operation of the support block 6 is required (such as installation, adjustment or handling of the side plate 3), it can provide a comfortable experience for the operator. The grip or force application point facilitates force application and control, reducing operator fatigue. A gap exists between the locking part 62 and the supporting shoulder 61, allowing the side plate 3 to extend into the gap. The locking part 62 includes a wedge-shaped block 621, with its inclined surface gradually approaching the gap from high to low. The wedge-shaped block 621 can engage with the locking groove 31 to connect the supporting block 6 and the side plate 3. The supporting block 6 and the side plate 3 employ a detachable locking structure with flexible installation direction, eliminating the need to differentiate between left and right specifications during production. The side plates 3 can be manufactured uniformly according to the same standard. After production is complete, the supporting blocks 6 can be assembled according to actual needs (e.g., left or right side installation), completely eliminating the troubles of production classification and inventory management caused by differences in left and right side plates 3. This significantly simplifies the production process and reduces the risk of production errors caused by specification confusion. The locking part 62 of the lifting block 6 is fixed by engaging the locking groove 31 of the side plate 3 with the wedge block 621. The inclined design of the wedge block 621 allows it to easily slide into the locking groove 31 with the help of external force during installation, and the locking is quickly completed by the guiding effect of the inclined surface. During disassembly, only a reverse force needs to be applied to make the wedge block 621 disengage from the locking groove 31, and the lifting block 6 can be removed from the receiving groove 32. No complicated tools are needed throughout the process, making the operation simple and labor-saving. The inclined surface of the wedge block 621 gradually approaches the gap from high to low. After it is locked into the locking groove 31, the right-angled edge of the inclined surface forms a tight locking structure with the inner wall of the locking groove 31, which can effectively resist the tendency of the lifting block 6 to fall off due to force (such as the pulling force when lifting external parts), ensuring a stable connection.

[0046] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A side plate fixing device, characterized in that: The device includes a fixing body that can be fixedly connected to the electrical connection assembly of the circuit breaker. The fixing body is arranged parallel to the base plate of the circuit breaker. The fixing body includes a fixing seat, multiple snap-fit ​​protrusions, and multiple screw holes. The multiple snap-fit ​​protrusions and multiple screw holes are all provided on the fixing seat. The side plate of the circuit breaker is provided with snap-fit ​​holes and through holes. The snap-fit ​​protrusions can snap into the snap-fit ​​holes, and the screws can pass through the through holes and the screw holes in sequence to fix the side plate to the electrical connection assembly. The length direction of the fixing body is the same as the length direction of the side plate.

2. The side plate fixing device according to claim 1, characterized in that: The fixed base is a slider, the electrical connection assembly is provided with a sliding groove, the slider is slidably connected to the sliding groove, and the end of the slider is provided with a first threaded hole. The electrical connection assembly is provided with a connecting hole. When the slider slides to the end of the electrical connection assembly, the bolt can pass through the connecting hole and the first threaded hole in sequence to fix the side plate to the electrical connection assembly.

3. The side plate fixing device according to claim 2, characterized in that: The slider has grooves on both sides, which are arranged along the length of the slider. The grooves are T-shaped, and the slider is slidably disposed in the T-shaped grooves.

4. The side plate fixing device according to claim 1, characterized in that: It also includes multiple fixing bosses, which are fixedly disposed on the fixing base along the length direction of the fixing base. The snap-fit ​​protrusion is fixedly disposed on the fixing boss, and the fixing boss is provided with the screw hole.

5. The side plate fixing device according to claim 4, characterized in that: At least two fixing bosses are provided, and at least one fixing boss is provided at each end of the fixing seat.

6. The side plate fixing device according to claim 5, characterized in that: A first snap-fit ​​protrusion and a first screw hole are provided on the fixing protrusion near the electrical connection component, and a second snap-fit ​​protrusion and two second screw holes are provided on the fixing protrusion away from the electrical connection component, with the second snap-fit ​​protrusion disposed between the two second screw holes.

7. The side plate fixing device according to claim 6, characterized in that: The first snap-fit ​​protrusion is located close to the electrical connection assembly, and the first screw hole is located away from the electrical connection assembly.

8. The side plate fixing device according to claim 1, characterized in that: The snap-fit ​​protrusion and the fixing seat are integrally injection molded.

9. A circuit breaker, characterized in that: The device includes a side plate, an electrical connection assembly, a base, and a side plate fixing device as described in any one of claims 1-8. The electrical connection assembly is fixedly disposed above the base, the side plate fixing device is fixedly connected to the electrical connection assembly, and the side plate is fixedly connected to the side plate fixing device.

10. The circuit breaker according to claim 9, characterized in that: A lifting block is provided on the upper part of the side plate. A receiving groove and a snap-fit ​​groove are provided on the upper part of the side plate. The snap-fit ​​groove is located above the receiving groove. The lifting block can be placed in the receiving groove. The lifting block includes a lifting shoulder and a snap-fit ​​part that are fixedly connected. There is a gap between the snap-fit ​​part and the lifting shoulder. The side plate can extend into the gap. The snap-fit ​​part includes a wedge-shaped block. The inclined surface of the wedge-shaped block gradually approaches the gap from high to low. The wedge-shaped block can be snapped into the snap-fit ​​groove to realize the connection between the lifting block and the side plate.

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