Turn-off device

Abstract

The utility model belongs to the field of photovoltaic technology, and discloses a turn-off device, which comprises a top shell, a bottom cover and a circuit board, and is characterized in that the top shell is provided with a mounting groove along a first direction, and the mounting groove comprises two abdicating walls which are oppositely arranged along a second direction; the bottom cover covers the top shell along a first direction; the circuit board is arranged in the mounting groove, and glue leakage gaps are formed between the circuit board and the two receding walls respectively. In the third direction, the groove width of the middle area of the glue leakage gap is larger than that of the areas at the two ends of the glue leakage gap. According to the turn-off device provided by the utility model, the groove width of the middle area of the glue leakage gap is larger than the groove width of the two end areas, the compact structure of the turn-off device can be ensured, and when the pouring sealant is filled, the pouring sealant can smoothly pass through the glue leakage gap, so that one side, facing the groove bottom of the mounting groove, of the circuit board is filled with the pouring sealant, and the reliability of the circuit board is improved. And gaps among the circuit board, the top shell and the pouring sealant are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a circuit breaker. Background Art

[0002] The smart switch is a connection product with a switch-off function used in photovoltaic power stations. When an abnormality occurs in a photovoltaic module, the switch can actively switch off to avoid failure of the entire string.

[0003] At present, in order to ensure that the circuit breaker can be used in a high temperature environment, the circuit breaker is usually filled with potting glue, and the circuit board of the circuit breaker is in contact with the shell through the potting glue to accelerate the heat dissipation. However, when pouring glue into the shell of the circuit breaker, due to the presence of the circuit board, the fluidity problem caused by the tension of the potting glue may cause the potting glue to be unable to flow through the gap between the circuit board and the shell, so that there may be a gap between the circuit board, the shell and the potting glue. The gap will affect the heat dissipation of the circuit board and may cause the circuit board to burn. Utility Model Content

[0004] The utility model aims to provide a switch which can effectively prevent gaps from being generated between a circuit board, a housing and a potting adhesive.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A circuit breaker is provided, comprising:

[0007] The top shell is provided with a mounting groove along the first direction, and the mounting groove includes two yielding walls which are arranged opposite to each other along the second direction;

[0008] A bottom cover, arranged on the top shell along the first direction;

[0009] A circuit board is arranged in the installation slot, and a gap for glue leakage is formed between the circuit board and the two give-way walls respectively; wherein,

[0010] Along the third direction, the groove width of the middle area of ​​the glue leakage gap is greater than the groove width of the two end areas, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0011] Optionally, a cross section of the giving way wall perpendicular to the first direction is arc-shaped.

[0012] Optionally, the circuit board includes two edge surfaces arranged opposite to each other along the second direction, the edge surfaces are arranged perpendicular to the second direction, and the glue leakage gap is formed between the edge surfaces and the yield wall on the corresponding side.

[0013] Optionally, a protrusion is provided on one side of the bottom cover along the first direction toward the top shell.

[0014] Optionally, a plurality of protrusions are arranged at intervals along the third direction, and an exhaust gap is formed between two adjacent protrusions.

[0015] Optionally, a cross section of the protrusion perpendicular to the third direction is arc-shaped.

[0016] Optionally, the top shell is provided with a positioning groove connected to the mounting groove, and a wire buckle is provided in the positioning groove, and the wire buckle is used to seal the gap between the external wire and the top shell and the bottom cover; wherein the external wire is used to be electrically connected to the circuit board.

[0017] Optionally, a bottom cover buckle is provided on the bottom cover, a slot is provided on the wire pressing buckle, and the bottom cover buckle is engaged with the slot.

[0018] Optionally, a side of the top shell along the first direction facing away from the bottom cover has a plurality of heat dissipation slots arranged at intervals.

[0019] Optionally, a base is protruded from a side of the bottom cover along the first direction facing away from the top shell.

[0020] Beneficial effects:

[0021] The shutoff device provided by the utility model has a groove width in the middle area of ​​the leaking gap along the third direction that is greater than the groove width at the two end areas. When filling the potting glue, the potting glue can smoothly pass through the leaking gap, so that the side of the circuit board facing the bottom of the installation groove is filled with the potting glue, effectively preventing the circuit board, the top shell and the potting glue from forming a gap. In addition, the design that the groove width in the middle area of ​​the leaking gap along the third direction is greater than the groove width at the two end areas can ensure the compact structure of the shutoff device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural cross-sectional view of the circuit breaker provided by the utility model. Figure 1 ;

[0023] Figure 2 It is a schematic diagram of the top shell and the structure inside the top shell provided by the utility model;

[0024] Figure 3 It is a structural schematic diagram of the bottom cover provided by the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the top shell provided by the utility model Figure 1 ;

[0026] Figure 5 It is a partial structural schematic diagram of the circuit breaker provided by the utility model;

[0027] Figure 6 It is a structural schematic diagram of the wire pressing buckle provided by the utility model;

[0028] Figure 7 is a schematic structural diagram of a circuit board provided by the present utility model;

[0029] Figure 8 is a sectional view of the structure of a switch provided by the present utility model Figure 2 ;

[0030] Figure 9 is a sectional view of the structure of a switch provided by the present utility model Figure 3 ;

[0031] Figure 10 is a schematic structural diagram of a top case provided by the present utility model Figure 2 ;

[0032] Figure 11 is an exploded view of the structure of a switch provided by the present utility model;

[0033] Figure 12 is a schematic structural diagram of a switch provided by the present utility model;

[0034] Figure 13 is a schematic structural diagram of a base provided by the present utility model.

[0035] In the figure:

[0036] 100, top case; 110, installation groove; 111, relief wall; 112, glue leakage gap; 120, positioning groove; 130, glue groove; 131, top case enclosing plate; 132, first gap; 133, second gap; 140, support column; 141, positioning boss; 150, heat dissipation groove; 160, card hole; 170, limiting groove; 180, relief groove;

[0037] 200, bottom cover; 210, protrusion; 220, exhaust gap; 230, bottom cover buckle;

[0038] 300, circuit board; 310, edge surface; 320, connection tab; 330, heating element;

[0039] 400, wire pressing buckle; 410, wire pressing groove; 411, rib; 420, card slot;

[0040] 500, external wire;

[0041] 600, base; 610, first base buckle; 620, second base buckle; 630, base enclosing plate; 631, first side plate; 632, end plate; 633, second side plate. Detailed implementation manners

[0042] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model and not for limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0043] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0044] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the" second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0046] Refer to Figure 1 and Figure 2 As shown, this embodiment provides a disconnector, which includes a top shell 100, a bottom cover 200, and a circuit board 300.

[0047] Specifically, the top shell 100 is provided with a mounting groove 110 along the first direction, and the mounting groove 110 includes two paving walls 111 arranged opposite to each other along the second direction; the bottom cover 200 is covered on the top shell 100 along the first direction; the circuit board 300 is arranged in the mounting groove 110, and a glue leakage gap 112 is formed between the circuit board 300 and the two paving walls 111; wherein, along the third direction, the groove width of the middle area of ​​the glue leakage gap 112 is greater than the groove width of the two end areas. wherein, the groove width refers to the size of the glue leakage gap 112 along the second direction.

[0048] Among them, the first direction, the second direction and the third direction are perpendicular to each other. The direction a in the figure is the first direction, which is the height direction of the circuit breaker. The direction b is the second direction, which is the width direction of the circuit breaker. The direction c is the third direction, which is the length direction of the circuit breaker.

[0049] In this embodiment, along the third direction, the groove width of the middle area of ​​the leakage gap 112 is greater than the groove width of the two end areas. When filling the potting glue, the potting glue can smoothly pass through the leakage gap 112, so that the side of the circuit board 300 facing the bottom of the installation groove 110 is filled with the potting glue, effectively preventing the circuit board 300, the top shell 100 and the potting glue from forming gaps. In addition, along the third direction, the design that the groove width of the middle area of ​​the leakage gap 112 is greater than the groove width of the two end areas can ensure the compact structure of the circuit breaker.

[0050] Exemplarily, the cross section of the clearance wall 111 perpendicular to the first direction is arc-shaped to ensure that the groove width in the middle area of ​​the leakage gap 112 is greater than the groove width at both end areas. Of course, the cross section of the clearance wall 111 perpendicular to the first direction can also be a broken line or other shapes, which is not limited in this application.

[0051] Exemplarily, the circuit board 300 includes two edge surfaces 310 arranged opposite to each other along the second direction, the edge surfaces 310 are arranged perpendicular to the second direction, and a glue leakage gap 112 is formed between the edge surfaces 310 and the corresponding side's give-way walls 111, and the give-way walls 111 with arc-shaped cross-sections are matched to make the groove width in the middle area of ​​the glue leakage gap 112 greater than the groove width at both end areas, and facilitate the molding of the circuit board 300.

[0052] In this embodiment, refer to Figure 1 and Figure 3 As shown, the bottom cover 200 is provided with a protrusion 210 on one side facing the top case 100 along the first direction. When the circuit breaker is assembled, the potting glue in the mounting groove 110 does not fill the entire mounting groove 110. For example, the potting glue is filled to a height of Figure 1At the position of the middle dotted line, when the bottom cover 200 is placed on the top shell 100, the protrusion 210 will squeeze the potting glue, and the liquid level of the potting glue in the installation groove 110 will rise, so that the potting glue fills the space enclosed by the bottom cover 200 and the top shell 100, effectively preventing the formation of gaps between the potting glue and the bottom cover 200 and the top shell 100, and effectively ensuring the heat dissipation effect of the circuit breaker. In addition, squeezing the potting glue by the protrusion 210 helps the potting to tightly wrap the entire circuit board 300; the protrusion 210 can also increase the contact area between the bottom cover 200 and the potting glue, improving the heat dissipation effect of the circuit breaker.

[0053] Exemplarily, a plurality of protrusions 210 are arranged at intervals along the third direction, and an exhaust gap 220 is formed between two adjacent protrusions 210. When the bottom cover 200 is covered on the top shell 100, the exhaust gap 220 is provided to facilitate the discharge of gas in the space enclosed by the bottom cover 200 and the top shell 100, thereby preventing the formation of a gap between the potting glue and the bottom cover 200. In addition, the exhaust gap 220 can increase the contact area between the potting glue and the bottom cover 200, improve the heat dissipation effect of the circuit breaker, and make the bonding between the potting glue and the bottom cover 200 firm and reliable.

[0054] Exemplarily, the cross section of the protrusion 210 perpendicular to the third direction is arc-shaped, which effectively prevents the formation of a gap between the potting glue and the bottom cover 200. Of course, the cross section of the protrusion 210 perpendicular to the third direction can also be polygonal or other shapes, which is not limited in this application.

[0055] Illustratively, along the third direction, the cross-sectional areas of the protrusions 210 in the middle and at the two ends decrease in sequence, thereby effectively preventing the potting glue from overflowing between the top shell 100 and the bottom cover 200 .

[0056] Illustratively, along the third direction, the cross-sectional area of ​​the protrusion 210 close to the middle of the bottom cover 200 is larger than the cross-sectional area of ​​the protrusion 210 away from the middle of the bottom cover 200, which effectively prevents the potting glue from overflowing between the top shell 100 and the bottom cover 200.

[0057] In a possible implementation, Figure 1 As shown, in order to ensure the sealing and firmness of the connection between the top shell 100 and the bottom cover 200 , a clearance groove 180 is provided at one end of the top shell 100 facing the bottom cover 200 , and the bottom cover 200 is disposed in the clearance groove 180 .

[0058] In a feasible implementation, the bottom cover 200 is provided with a glue injection port and an exhaust hole that are connected to the mounting groove 110. In this embodiment, the bottom cover 200 can be first placed on the top shell 100, and then the mounting groove 110 is filled with potting glue through the glue injection port, and the exhaust hole is used to exhaust the gas, so that the potting glue fills the space enclosed by the bottom cover 200 and the top shell 100.

[0059] In this embodiment, refer toFigure 2 , Figures 4 to 6 As shown in Figures 4 to 6 , the top shell 100 is provided with a positioning groove 120 communicating with the installation groove 110. A wire pressing buckle 400 is arranged in the positioning groove 120. The wire pressing buckle 400 is used to seal the gap between the external wire 500, the top shell 100 and the bottom cover 200 to prevent the potting glue from flowing out of the installation groove 110. Among them, the external wire 500 is used for electrically connecting with the circuit board 300.

[0060] Exemplarily, the wire pressing buckle 400 is provided with wire pressing grooves 410 corresponding one-to-one to the external wires 500. At least one rib 411, for example, two ribs, is arranged in the wire pressing grooves 410. The external wire 500 is located in the corresponding wire pressing groove 410, and the external wire 500 is squeezed by the rib 411 to ensure the sealing performance between the external wire 500, the wire pressing buckle 400 and the top shell 100.

[0061] Exemplarily, the circuit board 300 is connected with the external wire 500 through a connection tab 320. Optionally, at least one connection tab 320 for electrically connecting with the external wire 500, for example, two connection tabs, is arranged at both ends of the circuit board 300 along the third direction.

[0062] Exemplarily, a bottom cover buckle 230 is arranged on the bottom cover 200, and a card slot 420 is arranged on the wire pressing buckle 400. The bottom cover buckle 230 is clamped with the card slot 420 to realize the connection between the bottom cover 200 and the wire pressing buckle 400, and realize the positioning and assembly between the bottom cover 200 and the top shell 100.

[0063] In this embodiment, referring to Figure 4 , Figures 7 to 9 As shown, a heating element 330 is arranged on the circuit board 300, and a glue groove 130 is arranged in the installation groove 110. The heating element 330 is located in the glue groove 130. When assembling the disconnector, potting glue can be filled in the glue groove 130 first, and the circuit board 300 is installed in the installation groove 110 of the top shell 100. The heating element 330 squeezes the potting glue in the glue groove 130, so that the potting glue in the glue groove 130 can tightly wrap the heating element 330, effectively preventing voids from being generated between the heating element 330 and the potting glue; then potting glue is filled in the installation groove 110 of the top shell 100, so that the potting glue wraps other areas of the circuit board 300 except the heating element 330; finally, the bottom cover 200 is covered on the top shell 100. The potting glue is filled in a divided way, effectively preventing voids from being generated between the circuit board 300 and the potting glue, and further preventing the situation that the circuit board 300 is burned out due to poor local heat dissipation of the circuit board 300.

[0064] In a feasible implementation, since the heat dissipated by the heating element 330 is greater than that dissipated by other areas of the circuit board 300, a highly thermally conductive potting compound can be filled in the glue groove 130 to accelerate the heat dissipation of the heating element 330, and a common thermally conductive potting compound can be filled in the installation groove 110 to assist in the heat dissipation of other areas of the circuit board 300 except the heating element 330.

[0065] Exemplarily, the heating element 330 includes, but is not limited to, diodes, chips, capacitors, and inductors.

[0066] Exemplarily, there is at least one glue groove 130, and each glue groove 130 can accommodate at least one heating element 330. As Figure 4 and Figure 7 shown, there are two glue grooves 130 in the installation groove 110, and there are three heating elements 330 on the circuit board 300. Two heating elements 330 are accommodated in one glue groove 130, and one heating element 330 is accommodated in the other glue groove 130.

[0067] Exemplarily, the opening of the glue groove 130 faces the first direction. Specifically, a top shell enclosure plate 131 is provided at the bottom of the installation groove 110, and the glue groove 130 is formed by enclosing the top shell enclosure plate 131. A first gap 132 is formed between the end of the top shell enclosure plate 131 and the circuit board 300. Among them, the potting compound can be filled to the Figure 9 dotted line position in. During the assembly of the disconnector, when the circuit board 300 is installed in the installation groove 110 of the top shell 100, the heating element 330 squeezes the potting compound in the glue groove 130, and the potting compound overflows into the first gap 132. Relying on the tension of the potting compound, the potting compound can be kept in the first gap 132, thereby ensuring that the potting compound can tightly wrap the heating element 330 and effectively preventing voids from being generated between the circuit board 300 at the first gap 132 and the potting compound. Optionally, the dimension h1 of the first gap 132 in the first direction is 0.2 mm - 2 mm, such as 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, or 1.5 mm.

[0068] Exemplarily, a second gap 133 is formed between the bottom of the glue groove 130 and the heating element 330. There may be deviations in the dimensions of the heating element 330. Through the setting of the second gap 133, installation interference between the heating element 330 and the bottom of the glue groove 130 can be prevented. Optionally, the dimension h2 of the second gap 133 in the first direction is 0.2 mm - 2 mm, such as 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, or 1.5 mm. A smaller second gap 133 can reduce the distance for the heat of the heating element 330 to be exported to the top shell 100 and increase the heat dissipation efficiency of the heating element 330.

[0069] Exemplarily, a plurality of support columns 140 are provided in the installation groove 110. A positioning boss 141 is provided at the end of the support column 140. The circuit board 300 abuts against the end of the support column 140. The positioning boss 141 can penetrate through the circuit board 300 or abut against the edge of the circuit board 300 to achieve the positioning and assembly of the circuit board 300.

[0070] In a feasible implementation manner, as Figure 10 and Figure 11 shown, a plurality of heat dissipation grooves 150 are provided at intervals on the side of the top shell 100 facing away from the bottom cover 200 in the first direction, so as to increase the surface area of the top shell 100 for heat exchange with air and improve the heat dissipation effect of the disconnector.

[0071] Exemplarily, the heat dissipation grooves 150 can be provided at intervals in the third direction, and the heat dissipation grooves 150 are strip-shaped and arranged at an angle with the second direction, so as to further increase the surface area of the top shell 100 for heat exchange with air. Optionally, the angle between the heat dissipation grooves 150 and the second direction can be 5°-60°.

[0072] Exemplarily, both ends of the heat dissipation groove 150 can penetrate through the top shell 100, so that the air flow in the heat dissipation groove 150 is smooth, and the heat dissipation effect of the disconnector can be further improved.

[0073] In this embodiment, referring to Figures 11 to 13 shown, a base 600 protrudes from the side of the bottom cover 200 facing away from the top shell 100 in the first direction. Among them, the base 600 can be fixed to the component to be installed by bonding, threaded connection or other connection methods. The component to be installed can be a photovoltaic module. When the base 600 is installed on the component to be installed, a ventilation channel is formed between the base 600, the component to be installed and the bottom cover 200, so as to improve the heat dissipation effect of the disconnector and effectively reduce the shielding area of the disconnector on the photovoltaic module, which is beneficial to improving the power generation efficiency of the photovoltaic module.

[0074] Exemplarily, bases 600 are provided at both ends of the bottom cover 200 in the third direction to provide good support.

[0075] Exemplarily, one of the top shell 100 and the bottom cover 200 is detachably connected to the base 600. In some special application scenarios, when the base 600 is separated, the bottom cover 200 can be fixed to the component to be installed by bonding, threaded connection or other connection methods.

[0076] In a feasible implementation, on both sides of the base 600 along the second direction, there are first base buckles 610. On the top shell 100, there are corresponding card holes 160 that correspond one-to-one with the first base buckles 610. The first base buckles 610 are snap-connected to the card holes 160, which facilitates disassembly and assembly. In this embodiment, the card holes 160 can not only cooperate with the first base buckles 610. In some special application scenarios, the base 600 is separated, and a cable tie is passed through the card holes 160 to tie the disconnector to the component to be installed, such as tying it to the bracket of a photovoltaic module, improving applicability.

[0077] Further, on one side where the base 600 protrudes from the top shell 100 along the third direction, there is a second base buckle 620. The second base buckle 620 is snap-connected to the side of the top shell 100 facing away from the bottom cover 200 to ensure the stable connection between the base 600 and the top shell 100.

[0078] Specifically, a base fence 630 can be provided on the base 600. Both the first base buckle 610 and the second base buckle 620 are provided on the base fence 630, effectively ensuring the structural strength of the first base buckle 610 and the second base buckle 620, and making the connection between the base 600 and the top shell 100 stable and reliable.

[0079] Exemplarily, the base fence 630 includes first side plates 631 that are oppositely arranged along the second direction. On both the top shell 100 and the bottom cover 200, there are corresponding limit grooves 170 that correspond one-to-one with the first side plates 631. The first side plates 631 are located within the limit grooves 170 to achieve the positioning of the base 600 along the third direction.

[0080] Exemplarily, the first base buckle 610 can be provided on the corresponding first side plate 631, that is, the card hole 160 is located at the limit groove 170, effectively ensuring the structural compactness of the shell body.

[0081] Exemplarily, the base fence 630 includes end plates 632 that protrude from the top shell 100 along the third direction. Two second base buckles 620 are arranged at intervals along the third direction on the end plates 632 to make way for the external wire 500 and ensure the stable connection between the base 600 and the top shell 100.

[0082] Exemplarily, the base fence 630 includes second side plates 633 that are oppositely arranged along the second direction. The second side plates 633 are located between the first side plates 631 and the end plates 632. The first side plates 631 and the end plates 632 are connected into one body through the second side plates 633 to ensure the structural strength of the base 600.

[0083] It can be understood that for the connection methods not clearly described in the text, common connection methods such as threaded connection, welding, or bonding can be selected according to needs.

[0084] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A circuit breaker, characterized in that: include: The top shell (100) is provided with a mounting groove (110) along a first direction, and the mounting groove (110) comprises two yielding walls (111) arranged opposite to each other along a second direction; A bottom cover (200) is arranged on the top shell (100) along the first direction; The circuit board (300) is arranged in the installation groove (110), and a glue leakage gap (112) is formed between the circuit board (300) and the two clearance walls (111); wherein: Along the third direction, the groove width of the middle region of the glue leakage gap (112) is greater than the groove width of the two end regions, wherein the first direction, the second direction and the third direction are perpendicular to each other.

2. The circuit breaker according to claim 1, characterized in that: The cross section of the clearance wall (111) perpendicular to the first direction is arc-shaped.

3. The circuit breaker according to claim 1, characterized in that: The circuit board (300) comprises two edge surfaces (310) arranged opposite to each other along the second direction, the edge surfaces (310) being arranged perpendicular to the second direction, and the glue leakage gap (112) being formed between the edge surfaces (310) and the clearance walls (111) on the corresponding sides.

4. The circuit breaker according to claim 1, characterized in that: A protrusion (210) is provided on one side of the bottom cover (200) along the first direction facing the top shell (100).

5. The circuit breaker according to claim 4, characterized in that: A plurality of protrusions (210) are arranged at intervals along the third direction, and an exhaust gap (220) is formed between two adjacent protrusions (210).

6. The circuit breaker according to claim 4, characterized in that: The protrusion (210) has an arc-shaped cross section perpendicular to the third direction.

7. The circuit breaker according to claim 1, characterized in that: The top shell (100) is provided with a positioning groove (120) connected to the installation groove (110), and a wire pressing buckle (400) is provided in the positioning groove (120), and the wire pressing buckle (400) is used to seal the gap between the external wire (500) and the top shell (100) and the bottom cover (200); wherein the external wire (500) is used to be electrically connected to the circuit board (300).

8. The circuit breaker according to claim 7, characterized in that: The bottom cover (200) is provided with a bottom cover buckle (230), the line pressing buckle (400) is provided with a clamping slot (420), and the bottom cover buckle (230) is clamped with the clamping slot (420).

9. The circuit breaker according to claim 1, characterized in that: A plurality of heat dissipation slots (150) are arranged at intervals on a side of the top shell (100) facing away from the bottom cover (200) along the first direction.

10. The circuit breaker according to claim 1, characterized in that: A base (600) is protrudingly provided on a side of the bottom cover (200) facing away from the top shell (100) along the first direction.

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