breaker

Abstract

This invention belongs to the field of low-voltage electrical appliance technology and discloses a circuit breaker. The circuit breaker includes a base, a top cover, a stationary contact, a moving contact, a first baffle, and a second baffle. The top cover is disposed on the base, and a first groove is formed on the base. The stationary contact and the moving contact are respectively disposed on the base and located below the first groove. The moving contact can rotate relative to the base. The first baffle is rotatably disposed on the base. The rotation of the moving contact can drive the first baffle to rotate synchronously. When the circuit breaker is in the open state, the first baffle rotates between the moving contact and the stationary contact. When the circuit breaker is in the closed state, the first baffle rotates to the first groove, and the moving contact contacts the stationary contact. The second baffle is disposed in the first groove and located above the stationary contact. The first baffle and the second baffle can form a blocking space to block the upward movement of the electric arc when the circuit breaker is energized and closed. This blocking space can block most of the upward movement of the electric arc, thereby improving the breaking capacity and arc extinguishing capacity of the circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more particularly to a circuit breaker that prevents the upward movement of an electric arc. Background Technology

[0002] Currently, arc-blocking baffles are typically installed between the moving and stationary contacts of circuit breakers. When the circuit breaker closes, the arc-blocking baffle can rotate between the moving and stationary contacts without interfering with the closing. When the circuit breaker opens, the arc-blocking baffle can rotate between the moving and stationary contacts to isolate and cut off the electric arc, thereby quickly cutting off and extinguishing the electric arc generated between the moving and stationary contacts.

[0003] However, although the arc-blocking baffle can block the arc between the moving and stationary contacts, the arc generated when the circuit breaker is energized and closed will move to the upper side of the circuit breaker, causing damage to the components on the upper side of the circuit breaker and reducing the service life of the circuit breaker.

[0004] Therefore, there is an urgent need for a circuit breaker that can not only quickly cut off and extinguish the arc between the moving and stationary contacts, but also prevent the arc from moving upwards, in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a circuit breaker that can quickly cut off and extinguish the electric arc between the moving contact and the stationary contact, and can effectively prevent the electric arc generated when the circuit breaker is closed under energization from moving upward, thereby improving the service life of the circuit breaker.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Circuit breakers, including:

[0008] A base and a top cover, wherein the top cover is disposed on the base, a first groove is formed on the base, and an arc-extinguishing chamber is provided on the base;

[0009] A stationary contact and a moving contact are respectively disposed on the base and located below the first groove, and the moving contact is rotatable relative to the base;

[0010] The first baffle is rotatably mounted on the base, and the rotation of the moving contact can drive the first baffle to rotate synchronously, so that when the circuit breaker is in the open state, the first baffle rotates between the moving contact and the stationary contact, and when the circuit breaker is in the closed state, the first baffle rotates to the first groove, and the moving contact contacts the stationary contact.

[0011] The second baffle is disposed between the base and the top cover. The second baffle is disposed in the first groove and located above the stationary contact of the stationary contact. The first baffle and the second baffle can form a blocking space to prevent the arc from moving upward when the circuit breaker is energized and closed.

[0012] As an optional solution, the second baffle includes:

[0013] The first baffle plate is fixedly mounted on the base and located above the stationary contact point, and the first baffle plate is located in the first groove;

[0014] The second baffle is fixedly mounted on the upper cover and matched with the first baffle. When the upper cover is placed on the base, the second baffle is attached to the first baffle.

[0015] As an optional solution, the first partition plate has an arc structure.

[0016] As an optional solution, the second baffle includes:

[0017] The third baffle is fixedly installed on one of the base or the upper cover. When the upper cover is placed on the base, the third baffle is attached to the other of the upper cover or the base.

[0018] As an optional feature, a second groove is also formed on the base, the second groove being located below the moving contact and the stationary contact, and a gap groove is formed between the second groove and the moving contact; the circuit breaker further includes:

[0019] A boss is provided between the base and the upper cover. When the upper cover is placed on the base, the boss is inserted into the spacer groove.

[0020] As an optional solution, the boss includes:

[0021] The first sub-protrusion is fixedly disposed on the upper cover. When the upper cover is placed on the base, the first sub-protrusion is inserted into the spacer groove.

[0022] As an optional solution, the boss includes:

[0023] The second sub-protrusion is fixedly disposed on the base and is located in the spacer groove;

[0024] The third sub-protrusion is fixedly disposed on the upper cover. The third sub-protrusion is matched with the second sub-protrusion. When the upper cover is placed on the base, the second sub-protrusion and the third sub-protrusion are in contact.

[0025] As an optional solution, the first baffle is provided with a rotating part, a limiting part and a shielding part, the rotating part is rotatably connected to the base, and the limiting part is provided with a sliding groove;

[0026] The moving contact is provided with a convex shaft, which is slidably disposed in the groove so that the convex shaft drives the first baffle to rotate around the rotating part relative to the moving contact; when the circuit breaker is in the open state, the shielding part rotates to the position between the moving contact and the stationary contact of the moving contact; when the circuit breaker is in the closed state, the shielding part rotates into the first groove and forms the blocking space with the second baffle.

[0027] As an optional solution, the slide includes a first slide and a second slide, the first slide is disposed near the shielding part, and the second slide is disposed near the rotating part, and an angle is formed at the connection between the first slide and the second slide, with the opening facing the shielding part, and the angle is an obtuse angle.

[0028] As an optional solution, the shielding part has an arc-shaped structure.

[0029] Beneficial effects:

[0030] The circuit breaker proposed in this invention, by setting a first baffle and a second baffle, allows the moving contact to rotate along a first direction, causing the moving contact to drive the first baffle to rotate into a first groove in the base, so that the moving contact contacts the stationary contact, putting the circuit breaker in a closed state. At this time, the first baffle and the second baffle form a relatively closed blocking space between each other in the first groove, which can block most of the arc from moving upward, thereby driving the arc to transfer into the arc-extinguishing chamber of the circuit breaker, reducing the burn damage of the moving contact, stationary contact, base, and upper part of the top cover components caused by the arc. When the moving contact rotates along a first direction opposite to the first direction, the first baffle rotates into a first groove in the base, causing the moving contact to contact the stationary contact, so that the moving contact is in a closed state. When rotating in two directions, the moving contact can drive the first baffle to rotate between the moving contact and the stationary contact, so that the circuit breaker is in the open state. At this time, the first baffle can directly isolate the electric arc between the moving contact and the stationary contact, so as to quickly cut off and extinguish the electric arc generated between the moving contact and the stationary contact. At this time, although the space between the first baffle and the second baffle is larger, the first baffle and the second baffle can still block part of the electric arc from moving upward. This can reduce the burning damage of the moving contact, the stationary contact, and the components on the upper part of the base and the top cover caused by the electric arc, improve the breaking capacity and arc extinguishing capacity of the circuit breaker, and thus improve the service life of the circuit breaker. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the base (circuit breaker in open state) provided by the present invention. Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the base (circuit breaker in closed state) provided by the present invention. Figure 2 ;

[0033] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at point C in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of the top cover provided by the present invention;

[0035] Figure 5 This is a schematic diagram of the structure provided by the present invention, in which the upper cover is mounted on the base (the circuit breaker is in the open state). Figure 1 ;

[0036] Figure 6 yes Figure 5 A magnified schematic diagram of the local structure at point D;

[0037] Figure 7 This is a schematic diagram of the structure provided by the present invention, in which the upper cover is mounted on the base (with the circuit breaker in the closed state). Figure 2 ;

[0038] Figure 8 yes Figure 7 A magnified schematic diagram of the local structure at point E;

[0039] Figure 9 This is a schematic diagram of the structure of the moving contact provided by the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the first baffle provided by the present invention.

[0041] In the picture:

[0042] 1. Base; 11. First groove; 12. Second groove; 13. Spacer groove;

[0043] 2. Top cover;

[0044] 3. Stationary contact; 31. Stationary contact point; 4. Moving contact; 41. Moving contact point; 42. Protruding shaft;

[0045] 5. First baffle; 51. Rotating part; 52. Limiting part; 521. Slide groove; 5211. First slide groove; 5212. Second slide groove; 53. Shielding part;

[0046] 6. Second baffle; 61. First sub-baffle; 62. Second sub-baffle;

[0047] 71. First protrusion. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] When the circuit breaker is in the open state, the arc-blocking baffle can rotate between the moving contact and the stationary contact to isolate and cut off the arc, thereby quickly cutting off and extinguishing the arc generated between the moving contact and the stationary contact. However, although the arc-blocking baffle can block the arc between the moving contact and the stationary contact, most of the arc generated when the circuit breaker is closed under energization will move to the upper side of the circuit breaker, causing damage to the components on the upper side of the circuit breaker and reducing the service life of the circuit breaker.

[0053] To address the above problems, this embodiment provides a circuit breaker capable of preventing the arc generated during energized closing or opening of the circuit breaker from moving upwards, thereby driving the arc to move towards the lower left arc-extinguishing chamber; such as Figures 1 to 10 As shown, the circuit breaker includes a base 1, a top cover 2, a stationary contact 3, a moving contact 4, a first baffle 5, and a second baffle 6. The top cover 2 covers the base 1 to form a housing, which is used to house and encapsulate various components of the circuit breaker. A first groove 11 is formed on the base 1, and the arc-extinguishing chamber of the circuit breaker is located on the lower left side of the base 1. The stationary contact 3 and the moving contact 4 are respectively disposed on the base 1 and located below the first groove 11. The moving contact 4 can rotate relative to the base 1. The stationary contact 3 has a stationary contact point 31, and the moving contact 4 has a moving contact point 41. The first baffle 5 is rotatably disposed on the base 1, and the rotation of the moving contact 4 can drive the first baffle 5 to rotate synchronously. The second baffle 6 is disposed between the base 1 and the top cover 2. The second baffle 6 is disposed in the first groove 11 and located above the stationary contact point 31. The second baffle 6 is used to prevent the arc from moving upward.

[0054] Specifically, when the moving contact 4 rotates in the first direction, it drives the first baffle 5 to rotate into the first groove 11, causing the moving contact 41 to contact the stationary contact 31, thus putting the circuit breaker in the closed state and ensuring that the first baffle 5 does not interfere with the closing of the circuit breaker. Figure 3 As shown; at this time, the first baffle 5 and the second baffle 6 can form a relatively closed blocking space in the first groove 11, which can block the upward movement of the arc generated when the circuit breaker is energized and closed; when the moving contact 4 rotates in the second direction, the moving contact 4 can drive the first baffle 5 to rotate between the moving contact 41 and the stationary contact 31, so that the circuit breaker is in the open state, as shown. Figure 1 As shown. The first direction is opposite to the second direction, and the first direction is specifically as follows: Figure 1 The second direction, indicated by the middle arrow A, is clockwise. Figure 1 The direction indicated by the middle arrow B is counterclockwise.

[0055] Compared to existing technologies, the circuit breaker in this embodiment adds a second baffle 6 between the base 1 and the upper cover 2. When the circuit breaker is in the closed state, the first baffle 5 and the second baffle 6 form a relatively enclosed space within the first groove 11. This space effectively blocks most of the upward movement of the electric arc, allowing the arc to quickly transfer to the arc-extinguishing chamber on the lower left side. This reduces the damage caused by the arc to the moving contact 4, the stationary contact 3, and the upper parts of the base 1 and the upper cover 2. In other words, the formed blocking space effectively blocks most of the electric arc. The arc moves upward; when the circuit breaker is in the open state, the first baffle 5 can directly isolate the arc generated between the moving contact 4 and the stationary contact 3, so as to quickly cut off and extinguish the arc generated between the moving contact 4 and the stationary contact 3; at this time, although the space between the first baffle 5 and the second baffle 6 becomes larger, the first baffle 5 and the second baffle 6 can still block part of the arc from moving upward; thereby reducing the burn damage of the arc to the moving contact 4, the stationary contact 3, and the components on the upper part of the base 1 and the upper cover 2, so as to improve the breaking capacity and arc extinguishing capacity of the circuit breaker, and thus improve the service life of the circuit breaker.

[0056] It is worth noting that this embodiment primarily focuses on preventing the upward movement of the electric arc; other components of the circuit breaker and its specific working principle will not be described in detail here. Specifically, the circuit breaker in this embodiment can be an AC / DC miniature circuit breaker or a DC miniature circuit breaker.

[0057] It is worth noting that, since the first baffle 5 needs to rotate, when the first baffle 5 is rotated into the first groove 11, there is a small gap between the first baffle 5 and the second baffle 6, so as to ensure that the second baffle 6 will not interfere with the rotation of the first baffle 5, thereby ensuring the smooth rotation of the first baffle 5.

[0058] Furthermore, such as Figures 4 to 6 As shown, the second baffle 6 includes a first sub-baffle 61 and a second sub-baffle 62; wherein, the first sub-baffle 61 is fixedly mounted on the base 1 and located above the stationary contact 31, and the first sub-baffle 61 is located in the first groove 11; the second sub-baffle 62 is fixedly mounted on the upper cover 2, and the second sub-baffle 62 is matched with the first sub-baffle 61; when the upper cover 2 is placed on the base 1, the second sub-baffle 62 adheres to the first sub-baffle 61, thereby forming a complete second baffle 6.

[0059] Specifically, such as Figures 1 to 3 As shown, the first baffle 61 has an arc structure, with the center of the arc facing the contact point between the moving contact 41 and the stationary contact 31. The arc structure can increase the blocking area of ​​the second baffle 6 for the upward-moving electric arc, thereby blocking more of the electric arc from moving upward.

[0060] In other embodiments, the second baffle 6 may include a third sub-baffle, which is fixedly disposed on the base 1 or on one of the upper cover 2; when the upper cover 2 is placed on the base 1, the third sub-baffle is attached to the upper cover 2 or to the other of the base 1, thereby blocking the upward-moving electric arc from the second baffle 6.

[0061] Furthermore, such as Figure 3 As shown, a second groove 12 is also formed on the base 1. The second groove 12 is located below the moving contact 4 and the stationary contact 3. There is a gap groove 13 between the second groove 12 and the lower part of the moving contact 41. The gap groove 13 is located on the lower right side of the stationary contact 31. That is, the generated arc can also move to the right from the gap groove 13, causing damage to the components on the right side of the circuit breaker.

[0062] To address the above issues, the circuit breaker also includes a boss positioned between the base 1 and the top cover 2. When the top cover 2 is placed on the base 1, the boss is inserted into the partition groove 13. This allows the boss to block the partition groove 13, preventing most of the arc from moving from the partition groove 13 to the right side of the circuit breaker and driving the arc to quickly transfer to the arc-extinguishing chamber on the lower left side. This protects the components on the right side of the circuit breaker, further improving its breaking capacity and arc-extinguishing capability, and ultimately extending its service life.

[0063] It is worth noting that when the boss is inserted into the spacer slot 13, there is a small gap between the boss and the moving contact 4, so as to ensure that the boss will not interfere with the rotation of the moving contact 4 and ensure that the moving contact 4 can rotate smoothly.

[0064] Furthermore, such as Figures 4 to 8 As shown, the boss includes a first sub-boss 71, which is fixedly mounted on the upper cover 2. When the upper cover 2 is placed on the base 1, the first sub-boss 71 is inserted into the spacer groove 13, thereby blocking the spacer groove 13.

[0065] In other embodiments, the boss may include a second sub-boss and a third sub-boss; wherein the second sub-boss is fixedly mounted on the base 1 and is located in the spacer groove 13; the third sub-boss is fixedly mounted on the top cover 2 and is matched with the second sub-boss; when the top cover 2 is placed on the base 1, the second sub-boss and the third sub-boss fit together to form a complete boss.

[0066] Furthermore, such as Figure 1 , Figure 9 and Figure 10As shown, the first baffle 5 is provided with a rotating part 51, a limiting part 52, and a shielding part 53; wherein, the rotating part 51 is rotatably connected to the base 1, and the limiting part 52 is provided with a sliding groove 521 for adjusting the relative position between the first baffle 5 and the moving contact 4; and a convex shaft 42 is provided on the moving contact 4, the convex shaft 42 being slidably disposed in the sliding groove 521 so that the convex shaft 42 can drive the first baffle 5 to rotate relative to the moving contact 4 around the rotating part 51. In this embodiment, the first baffle 5 is formed into a triangular-like structure.

[0067] Specifically, when the circuit breaker is in the open state, the shielding part 53 rotates between the moving contact 41 and the stationary contact 31, such as... Figure 1 and Figure 6 As shown; when the circuit breaker is in the closed state, the shielding part 53 rotates into the first groove 11 and forms the aforementioned blocking space with the second baffle 6, as shown. Figure 3 and Figure 8 As shown.

[0068] Specifically, such as Figure 10 As shown, the slide 521 includes a first slide 5211 and a second slide 5212. The first slide 5211 is located near the shielding part 53, and the second slide 5212 is located near the rotating part 51. At the connection between the first slide 5211 and the second slide 5212, an angle is formed with the opening facing the shielding part 53, and the angle is obtuse. When the circuit breaker is open, the convex shaft 42 can slide from the first slide 5211 into the second slide 5212, so that the shielding part 53 rotates counterclockwise in the second direction to between the moving contact 41 and the stationary contact 31. When the circuit breaker is closed, the convex shaft 42 can slide from the second slide 5212 into the first slide 5211, so that the shielding part 53 rotates clockwise in the first direction to between the moving contact 41 and the stationary contact 31 and into the first groove 11.

[0069] Specifically, to achieve a better arc extinguishing effect, the area of ​​the shielding part 53 is larger than the area of ​​the contact surface between the moving contact 41 and the stationary contact 31, so that the shielding part 53 can completely cover the contact surface of the two, so that the electric arc between the moving contact 4 and the stationary contact 3 can burn and cool on the shielding part 53, thereby effectively shortening the arc burning time; and the shielding part 53 has an arc-shaped structure, with the arc center of the arc structure set close to the moving contact 41. The arc-shaped structure can increase the blocking area of ​​the shielding part 53 to block the electric arc, thereby blocking more electric arcs.

[0070] The circuit breaker in this embodiment not only blocks the arc between the moving contact 41 and the stationary contact 31 by setting the first baffle 5, but also blocks most of the arc from moving to the upper side of the circuit breaker when the circuit is closed or opened under energized conditions by the first baffle 5 and the second baffle 6. Furthermore, it can also block part of the arc from moving to the right side of the circuit breaker by the boss, thereby preventing the arc from moving to the upper right side of the circuit breaker. This better protects the moving contact 4, the stationary contact 3, and the components on the upper right side of the circuit breaker, resulting in higher breaking capacity and arc extinguishing capacity of the circuit breaker, and thus improving the service life of the circuit breaker.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A circuit breaker characterized by, The application relates to a circuit breaker, which comprises a base (1) and an upper cover (2), the upper cover (2) is arranged on the base (1), a first recess (11) is formed on the base (1), and an arc extinguishing chamber is arranged on the base (1); a static contact (3) and a dynamic contact (4) are arranged on the base (1) and located below the first recess (11), the dynamic contact (4) can rotate relative to the base (1); a first baffle (5) is rotatably arranged on the base (1), and the dynamic contact (4) can drive the first baffle (5) to rotate synchronously, so that the first baffle (5) is rotated to the position between the dynamic contact (4) and the static contact (3) when the circuit breaker is in an open state, the first baffle (5) can directly isolate the electric arc generated between the dynamic contact (4) and the static contact (3), and the first baffle (5) is rotated to the first recess (11) when the circuit breaker is in a closed state, and the dynamic contact (4) is in contact with the static contact (3); a second baffle (6) is arranged between the base (1) and the upper cover (2), the second baffle (6) is arranged in the first recess (11) and located above a static contact point (31) of the static contact (3); and the first baffle (5) and the second baffle (6) can form a blocking space for blocking the upward movement of the electric arc when the circuit breaker is closed under the condition of electrification, and the space between the first baffle (5) and the second baffle (6) is enlarged when the circuit breaker is opened. The second baffle (6) comprises: a first sub-baffle (61) which is fixedly arranged on the base (1) and located above the static contact point (31) and located in the first recess (11); and a second sub-baffle (62) which is fixedly arranged on the upper cover (2) and matched with the first sub-baffle (61), and the second sub-baffle (62) is attached to the first sub-baffle (61) when the upper cover (2) is arranged on the base (1). The first sub-baffle (61) is in a circular arc structure. The second baffle (6) comprises: a third sub-baffle which is fixedly arranged on one of the base (1) and the upper cover (2), and the third sub-baffle is attached to the other one of the upper cover (2) and the base (1) when the upper cover (2) is arranged on the base (1). A second recess (12) is further formed on the base (1), the second recess (12) is located below the dynamic contact (4) and the static contact (3), and a spacing groove (13) is arranged between the second recess (12) and the dynamic contact (4); and the circuit breaker further comprises: a boss which is arranged between the base (1) and the upper cover (2), and the boss is inserted into the spacing groove (13) when the upper cover (2) is arranged on the base (1).

2. The circuit breaker of claim 1, wherein, The boss comprises: ​ ​ 3. The circuit breaker of claim 2, wherein, ​ 4. The circuit breaker of claim 1, wherein, ​ ​ 5. The circuit breaker of any one of claims 1-4, wherein, ​ ​ 6. The circuit breaker of claim 5, wherein, ​ A first sub-convex platform (71) is fixedly arranged on the upper cover (2), and when the upper cover (2) is arranged on the base (1), the first sub-convex platform (71) is inserted into the spacing groove (13).

7. The circuit breaker of claim 5, wherein, The convex platform comprises: A second sub-convex platform is fixedly arranged on the base (1), and the second sub-convex platform is located in the spacing groove (13); A third sub-convex platform is fixedly arranged on the upper cover (2), and the third sub-convex platform is arranged in matching with the second sub-convex platform, and when the upper cover (2) is arranged on the base (1), the second sub-convex platform is in abutment with the third sub-convex platform.

8. The circuit breaker of any one of claims 1-4, wherein, The first baffle (5) is provided with a rotating part (51), a limiting part (52) and a shielding part (53), the rotating part (51) is rotationally connected with the base (1), and a sliding groove (521) is arranged on the limiting part (52); A convex shaft (42) is arranged on the moving contact (4), and the convex shaft (42) is slidingly arranged in the sliding groove (521), so that the convex shaft (42) drives the first baffle (5) to rotate around the rotating part (51) relative to the moving contact (4); when the circuit breaker is in an open state, the shielding part (53) is rotated to between the moving contact (41) of the moving contact (4) and the static contact (31); when the circuit breaker is in a closed state, the shielding part (53) is rotated into the first recess (11), and forms the blocking space with the second baffle (6).

9. The circuit breaker of claim 8, wherein, The sliding groove (521) comprises a first sliding groove (5211) and a second sliding groove (5212), the first sliding groove (5211) is arranged close to the shielding part (53), the second sliding groove (5212) is arranged close to the rotating part (51), an opening of an included angle facing the shielding part (53) is formed at the connection between the first sliding groove (5211) and the second sliding groove (5212), and the included angle is an obtuse angle.

10. The circuit breaker of claim 8, wherein, The shielding part (53) is an arc-shaped structure.

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