Contact assembly and circuit breaker

Abstract

Embodiments of the present disclosure provide a contact assembly and a circuit breaker. The contact assembly includes an arc chute, a first arc blade, a second arc blade, a stationary contact and a movable contact. The first arc blade and the second arc blade are respectively arranged at opposite ends of the arc chute. The stationary contact is arranged adjacent to one end of the arc chute. The stationary contact is electrically connected to the first arc blade. The movable contact is adapted to switch relative to the stationary contact between a closed position and an open position. The movable contact includes a body portion and a protruding portion. The protruding portion is arranged at one end of the body portion adjacent to the arc chute. The distance between the protruding portion and the second arc blade is less than the distance between the one end of the body portion adjacent to the arc chute and the second arc blade. In the case that the movable contact is in the closed position, the body portion abuts against the stationary contact. While in the case that the movable contact is in the open position, the protruding portion abuts against the second arc blade. With this arrangement, under different current conditions, the arc can fill the arc chute, thereby achieving better arc extinguishing effect.

Description

Technical Field

[0001] The embodiments disclosed herein relate generally to the field of electrical equipment, and more particularly to a contact assembly and a circuit breaker. Background Technology

[0002] Circuit breakers and other switching equipment typically include moving and stationary contacts, which connect or disconnect the circuit through contact or separation. When the contacts break the circuit, the sudden interruption of current can cause a high-temperature electric arc between the contacts, potentially damaging the equipment or even causing a safety accident. To address this, an arc-extinguishing chamber can be placed near the moving and stationary contacts. The function of the arc-extinguishing chamber is to rapidly cool, elongate, and ultimately extinguish the arc after it is generated, thereby ensuring that the circuit breaker can safely and reliably interrupt the current. Utility Model Content

[0003] In a first aspect of this disclosure, a contact assembly is provided. The contact assembly includes: an arc-extinguishing chamber; a first arc-starting piece and a second arc-starting piece, respectively disposed at opposite ends of the arc-extinguishing chamber; a stationary contact disposed adjacent to one end of the arc-extinguishing chamber and electrically connected to the first arc-starting piece; and a moving contact adapted to switch between a closed position and an open position relative to the stationary contact. The moving contact includes a body portion and a protrusion portion, the protrusion portion being disposed at the end of the body portion near the arc-extinguishing chamber, and the distance between the protrusion portion and the second arc-starting piece is less than the distance between the end of the body portion near the arc-extinguishing chamber and the second arc-starting piece. When the moving contact is in the closed position, the body portion abuts against the stationary contact, and when the moving contact is in the open position, the protrusion portion abuts against the second arc-starting piece.

[0004] In some embodiments, the protrusion includes an arcuate surface disposed on the side near the arc-extinguishing chamber and a flat surface disposed on the side near the second arc-inducing plate, wherein the arcuate surface and the flat surface form a sharp corner at their intersection.

[0005] In some embodiments, the second arc-starting piece includes: a first portion disposed at a corresponding end of the arc-extinguishing chamber; and a second portion disposed on the side of the arc-extinguishing chamber near the moving contact, connected to the first portion, and adapted to abut against the moving contact in the open position.

[0006] In some embodiments, the second part includes a first connecting segment, a second connecting segment, and a third connecting segment arranged sequentially; the first connecting segment is connected to the first part, the extension direction of the second connecting segment and the extension direction of the first connecting segment have a first angle, the extension direction of the third connecting segment and the extension direction of the first connecting segment have a second angle, and the second angle is smaller than the first angle, so that the third connecting segment abuts against the moving contact located in the disconnected position.

[0007] In some embodiments, the third connecting segment includes a tip that tapers gradually from the second connecting segment toward the moving contact.

[0008] In some embodiments, the contact assembly further includes a rotatable element rotatably coupled to the location to be installed and coupled to a moving contact to allow the moving contact to switch between a closed position and an open position during rotation.

[0009] In some embodiments, the arc-extinguishing chamber includes: a plurality of metal grids spaced apart from each other; and an insulating support coupled to the plurality of metal grids.

[0010] In some embodiments, each metal grid includes a groove disposed on the side near the moving contact, the moving contact corresponding to the opening of the corresponding groove during position switching.

[0011] In some embodiments, the end of the moving contact near the arc-extinguishing chamber passes through a first stroke segment and a second stroke segment in sequence as it moves from the closed position to the open position; the distance between the moving contact and the inner wall of the corresponding groove in the second stroke segment is greater than the distance between the moving contact and the inner wall of the corresponding groove in the first stroke segment.

[0012] In a second aspect of this disclosure, a circuit breaker is provided. The circuit breaker includes: a housing; and a contact assembly according to a first aspect of this disclosure, disposed within the housing, with a moving contact movably coupled to the housing.

[0013] In embodiments of this disclosure, the contact assembly includes an arc-extinguishing chamber, a first arc-starting plate, a second arc-starting plate, a stationary contact, and a moving contact. The first and second arc-starting plates are respectively disposed at opposite ends of the arc-extinguishing chamber. The stationary contact is disposed at one end adjacent to the arc-extinguishing chamber. The stationary contact is electrically connected to the first arc-starting plate. The moving contact is adapted to switch between a closed position and an open position relative to the stationary contact. The moving contact includes a body portion and a protrusion portion. The protrusion portion is disposed at the end of the body portion near the arc-extinguishing chamber. The distance between the protrusion portion and the second arc-starting plate is less than the distance between the end of the body portion near the arc-extinguishing chamber and the second arc-starting plate. When the moving contact is in the closed position, the body portion abuts against the stationary contact. When the moving contact is in the open position, the protrusion portion abuts against the second arc-starting plate. With this arrangement, the arc can fill the arc-extinguishing chamber under different current conditions, thereby achieving a better arc-extinguishing effect.

[0014] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A perspective view of a contact assembly according to some embodiments of the present disclosure is shown, wherein the protrusion includes an arcuate surface and a flat surface; Figure 2 A perspective view of a contact assembly according to some embodiments of the present disclosure is shown; Figure 3 A perspective view of the second arc-drawing piece according to some embodiments of the present disclosure is shown; Figure 4 A perspective view of a second arc-drawing piece according to some embodiments of the present disclosure is shown, wherein a first included angle and a second included angle are shown; Figure 5 A cross-sectional view of a circuit breaker according to some embodiments of the present disclosure is shown, in which a moving contact abuts against a stationary contact is shown; Figure 6 Cross-sectional views of circuit breakers according to some embodiments of the present disclosure are shown, wherein the moving contact is separated from the stationary contact; and Figure 7 A perspective view of a circuit breaker according to some embodiments of the present disclosure is shown.

[0016] Explanation of reference numerals in the attached figures: A1, the first included angle; A2, the second included angle; 100. Contact assembly; 10. Arc-extinguishing chamber; 101. Metal grid; 1010. Groove; 102. Insulating support; 11. First arc-starting piece; 12. Second arc-starting piece; 121. First part; 122. Second part; 1221. First connecting segment; 1222. Second connecting segment; 1223. Third connecting segment; 20. Stationary contact; 30. Moving contact; 31. Body part; 32. Protrusion; 321. Arc-shaped surface; 322. Plane; 40. Rotating parts; 500. Circuit breaker; 510. Shell. Detailed Implementation

[0017] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0018] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0019] In some conventional circuit breakers, under high current conditions, the magnetic blow-out and air blow-out actions are sufficient, the arc can stably fill the arc-extinguishing chamber, the arc voltage is well maintained, and the arc extinguishing effect is reliable. However, under medium current and lower operating conditions, due to insufficient arc driving force, the arc is difficult to stably fill the arc-extinguishing chamber, and phenomena such as arc retreat and arc voltage drop are prone to occur, resulting in prolonged arc burning time, decreased arc extinguishing performance, and affecting breaking reliability and equipment life.

[0020] This disclosure provides a contact assembly and a circuit breaker. The contact assembly includes an arc-extinguishing chamber, a first arc-starting plate, a second arc-starting plate, a stationary contact, and a moving contact. The first and second arc-starting plates are respectively disposed at opposite ends of the arc-extinguishing chamber. The stationary contact is disposed at one end adjacent to the arc-extinguishing chamber. The stationary contact is electrically connected to the first arc-starting plate. The moving contact is adapted to switch between a closed position and an open position relative to the stationary contact. The moving contact includes a body portion and a protrusion. The protrusion is disposed at the end of the body portion near the arc-extinguishing chamber. The distance between the protrusion and the second arc-starting plate is less than the distance between the end of the body portion near the arc-extinguishing chamber and the second arc-starting plate. When the moving contact is in the closed position, the body portion abuts against the stationary contact. When the moving contact is in the open position, the protrusion abuts against the second arc-starting plate. With this arrangement, under different current conditions, the arc can fill the arc-extinguishing chamber, thereby achieving a better arc-extinguishing effect. The following will describe... Figures 1 to 7 The principles of this disclosure will be described in detail below.

[0021] like Figure 1 and Figure 2 As shown, the contact assembly 100 can be installed in various types of circuit breakers 500, such as low-voltage molded case circuit breakers, universal circuit breakers, medium-voltage vacuum circuit breakers, and DC circuit breakers. The contact assembly 100 can realize the connection and disconnection of the circuit, thereby ensuring the safe operation of the equipment.

[0022] like Figure 1 and Figure 2As shown, the contact assembly 100 may include an arc-extinguishing chamber 10, a first arc-inducing plate 11, a second arc-inducing plate 12, a stationary contact 20, and a moving contact 30. The arc-extinguishing chamber 10 can extinguish the arc during circuit breaking, thereby preventing the circuit breaker 500 from being damaged by the continuous burning of the arc. In some embodiments, the arc-extinguishing chamber 10 can increase the arc voltage by dividing it with metal grid plates 101, thereby achieving rapid arc extinguishing. In other embodiments, the arc-extinguishing chamber 10 can extinguish the arc by magnetic blowing, air blowing, slit cooling, or other methods.

[0023] like Figure 1 and Figure 2 As shown, the first arc-starting plate 11 and the second arc-starting plate 12 are respectively disposed at opposite ends of the arc-extinguishing chamber 10. For example, when the arc-extinguishing chamber 10 is vertically disposed, the first arc-starting plate 11 can be disposed at the bottom of the arc-extinguishing chamber 10, and the second arc-starting plate 12 can be disposed at the top of the arc-extinguishing chamber 10. It should be understood that the vertical arrangement here is merely exemplary, and those skilled in the art can arrange the arc-extinguishing chamber 10 at any tilt angle within the circuit breaker 500 according to the spatial layout requirements within the circuit breaker 500; this disclosure does not impose any limitations in this regard.

[0024] like Figure 1 and Figure 2 As shown, the stationary contact 20 is disposed adjacent to one end of the arc-extinguishing chamber 10. The stationary contact 20 is electrically connected to the first arc-starting plate 11. The moving contact 30 can be switched between a closed position and an open position relative to the stationary contact 20. In some embodiments, the moving contact 30 is rotatably connected to the housing 510 of the circuit breaker 500. In this way, the moving contact 30 can switch between a closed position and an open position during rotation.

[0025] In some embodiments, such as Figure 1 and Figure 2 As shown, the contact assembly 100 may further include a rotating member 40. The rotating member 40 is rotatably coupled to the position to be installed. The rotating member 40 is coupled to the moving contact 30. With this arrangement, the moving contact 30 can be fixed to the rotating member 40, thereby rotating with the rotating member 40. The moving contact 30 can switch between a closed position and an open position during rotation.

[0026] In other embodiments, the moving contact 30 is slidably connected to the housing 510 of the circuit breaker 500. For example, a groove or guide rail may be provided within the housing 510 of the circuit breaker 500. The moving contact 30 is slidably connected to the groove or guide rail. In this way, the moving contact 30 can switch between a closed position and an open position during sliding.

[0027] like Figure 1 and Figure 2As shown, the moving contact 30 includes a body portion 31 and a protrusion 32. The protrusion 32 is disposed at the end of the body portion 31 near the arc-extinguishing chamber 10. In some embodiments, the protrusion 32 and the body portion 31 are integrally formed, for example, manufactured by stamping, cutting, or machining. In other embodiments, the protrusion 32 and the body portion 31 are separate structures, for example, the protrusion 32 is fixed to the end of the body portion 31 near the arc-extinguishing chamber 10 by welding, riveting, or snap-fitting. The distance between the protrusion 32 and the second arc-starting plate 12 is less than the distance between the end of the body portion 31 near the arc-extinguishing chamber 10 and the second arc-starting plate 12. When the moving contact 30 is in the closed position, the body portion 31 abuts against the stationary contact 20. When the moving contact 30 is in the open position, the protrusion 32 abuts against the second arc-starting plate 12.

[0028] With this arrangement, during the switching process of the moving contact 30 from the closed position to the open position, the electric arc can stably enter and fill the arc-extinguishing chamber 10 under different current conditions, thereby achieving a better arc-extinguishing effect.

[0029] In some embodiments, such as Figure 1 and Figure 2 As shown, the protrusion 32 includes an arcuate surface 321 on the side near the arc-extinguishing chamber 10 and a flat surface 322 on the side near the second arc-starting piece 12. The arcuate surface 321 and the flat surface 322 form a sharp angle at their intersection. As an example, the arcuate surface 321 can be a circular arc surface. The radius of the circular arc surface can be R1. The end of the body portion 31 near the arc-extinguishing chamber 10 can also be circular arc with a radius of R2. When R1 is greater than R2, the protrusion 32 will partially protrude to the side near the second arc-starting piece 12. A flat surface 322 is provided on the side of the protrusion 32 near the second arc-starting piece 12. When the moving contact 30 moves to the open position, the end of the second arc-starting piece 12 will abut against the flat surface 322.

[0030] In other embodiments, the arcuate surface 321 can be an elliptical arcuate surface or other arcuate structures with curvature (such as parabolic shapes). Furthermore, the end of the body portion 31 near the arc-extinguishing chamber 10 can also adopt a prism structure, a cylindrical structure, or other irregularly shaped structure. The overall size of this end is smaller than the size of the protrusion 32, thereby making the distance between the protrusion 32 and the second arc-inducing plate 12 smaller than the distance between the end of the body portion 31 near the arc-extinguishing chamber 10 and the second arc-inducing plate 12. Those skilled in the art can choose the shape and size of the arcuate surface 321 and the body portion 31 as needed; this disclosure does not impose any limitations on this.

[0031] In some embodiments, such as Figures 1 to 3As shown, the second arc-starting piece 12 includes a first portion 121 and a second portion 122. The first portion 121 is disposed at a corresponding end of the arc-extinguishing chamber 10. The second portion 122 is disposed on the side of the arc-extinguishing chamber 10 near the moving contact 30. The second portion 122 is connected to the first portion 121. In some embodiments, the first portion 121 and the second portion 122 can be integrally formed. For example, the second portion 122 is formed by bending the edge of the first portion 121. In other embodiments, the first portion 121 and the second portion 122 can be separate structures, for example, the second portion 122 can be fixed to the first portion 121 by welding, riveting or snap-fitting. With this arrangement, when the moving contact 30 moves to the open position, the second portion 122 can abut against the moving contact 30, thereby keeping the moving contact 30 in a stable position. In addition, the first portion 121 and the second portion 122 can guide the arc from the moving contact 30 to the interior of the arc-extinguishing chamber 10, thereby preventing the arc from burning the moving contact 30 and the stationary contact 20.

[0032] In some embodiments, such as Figure 3 and Figure 4 As shown, the second part 122 may include a first connecting segment 1221, a second connecting segment 1222, and a third connecting segment 1223 arranged sequentially. The first connecting segment 1221 is connected to the first part 121. The second connecting segment 1222 and the first connecting segment 1221 have a bend at the connection point. This bend allows the extension direction of the second connecting segment 1222 to be adjusted, thereby bringing the second connecting segment 1222 closer to the moving contact 30. The extension direction of the second connecting segment 1222 and the extension direction of the first connecting segment 1221 have a first angle A1. The extension direction of the third connecting segment 1223 and the extension direction of the first connecting segment 1221 have a second angle A2. The second angle A2 is smaller than the first angle A1. The third connecting segment 1223 and the second connecting segment 1222 also have a bend at the connection point. This allows the extension direction of the third connecting segment 1223 to be further adjusted, thereby allowing the third connecting segment 1223 to stably abut against the moving contact 30 located in the disconnected position.

[0033] In some embodiments, such as Figure 3 and Figure 4 As shown, the third connecting section 1223 includes a tip that gradually tapers from the second connecting section 1222 toward the moving contact 30. With this arrangement, the tip of the third connecting section 1223 can better guide the arc from the moving contact 30 to the arc-extinguishing chamber 10, thereby preventing the arc from burning the moving contact 30 and the stationary contact 20.

[0034] In some embodiments, such as Figure 1 and Figure 2As shown, the arc-extinguishing chamber 10 includes a plurality of spaced-apart metal grids 101 and an insulating support 102. The insulating support 102 is coupled to the plurality of metal grids 101. With this arrangement, the plurality of metal grids 101 can divide a long electric arc into a plurality of short electric arcs connected in series, thereby improving the arc-extinguishing efficiency. The insulating support 102 can fix and isolate the plurality of metal grids 101, thereby preventing short circuits between adjacent metal grids 101.

[0035] In some embodiments, such as Figure 1 As shown, each metal grid 101 includes a groove 1010 disposed on the side near the moving contact 30. During position switching, the moving contact 30 corresponds to the opening of the corresponding groove 1010. Due to the presence of the groove 1010, the distance between the moving contact 30 and the corresponding metal grid 101 increases during position switching.

[0036] In some embodiments, such as Figure 2 As shown, the end of the moving contact 30 closest to the arc-extinguishing chamber 10 passes through a first stroke segment and a second stroke segment sequentially during its movement from the closed position to the open position. As an example, when the moving contact 30 is rotatably connected to the housing 510, if the moving contact 30 needs to rotate 30° to move from the closed position to the open position, the closed position can be defined as the starting angle of 0°. The first stroke segment corresponds to a rotation angle of 0° to 15°, and the second stroke segment corresponds to a rotation angle of 15° to 30°. As another example, when the moving contact 30 is slidably connected to the housing 510 of the circuit breaker 500, if the total stroke of the moving contact 30 from the closed position to the open position is L0, the first stroke segment refers to the distance L1 moved from the closed position, and the second stroke segment refers to the distance L2 moved from the end of L1 (where L1 + L2 = L0) until the open position is reached.

[0037] It should be noted that the figures, values, etc., mentioned above and elsewhere in this disclosure are exemplary and are not intended to limit the scope of this disclosure in any way. Any other suitable figures or values ​​are possible.

[0038] like Figure 2 As shown, the distance between the moving contact 30 in the second stroke segment and the inner wall of the corresponding groove 1010 is greater than the distance between the moving contact 30 in the first stroke segment and the inner wall of the corresponding groove 1010. With this arrangement, during the switching process of the moving contact 30 from the closed position to the open position, the arc can stably enter and fill the arc-extinguishing chamber 10 under different current conditions, thereby achieving a better arc-extinguishing effect.

[0039] In a second aspect of this disclosure, a circuit breaker 500 is provided. For example... Figures 5 to 7As shown, the circuit breaker 500 includes a housing 510 and a contact assembly 100 of any of the above-described types. The contact assembly 100 is disposed within the housing 510. The moving contact 30 is movably coupled to the housing 510.

[0040] As an example, such as Figure 5 and Figure 6 As shown, the circuit breaker 500 can be a double-break circuit breaker. In this case, a pair of contact assemblies 100 are provided inside the housing 510 of the circuit breaker 500. For example, a rotating member 40 is provided inside the circuit breaker 500. The rotating member 40 is connected to a pair of moving contacts 30. When the rotating member 40 rotates, the pair of moving contacts 30 can respectively make contact with or separate from their corresponding stationary contacts 20, thereby completing the closure or opening of the two breaks.

[0041] As another example, circuit breaker 500 can be a single-break circuit breaker. Only one contact assembly 100 is located within the housing 510. In this case, the rotating member 40 is connected to a single moving contact 30. During rotation of the rotating member 40, the single moving contact 30 contacts or separates from the single stationary contact 20, thereby achieving single-break switching.

[0042] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A contact assembly (100), characterized in that, include: Arc extinguishing chamber (10); The first arc-starting plate (11) and the second arc-starting plate (12) are respectively disposed at opposite ends of the arc-extinguishing chamber (10); A stationary contact (20) is disposed at one end adjacent to the arc-extinguishing chamber (10) and electrically connected to the first arc-starting plate (11); and A moving contact (30) is adapted to switch between a closed position and an open position relative to the stationary contact (20). The moving contact (30) includes a body portion (31) and a protrusion (32). The protrusion (32) is disposed at one end of the body portion (31) near the arc-extinguishing chamber (10), and the distance between the protrusion (32) and the second arc-starting plate (12) is less than the distance between the end of the body portion (31) near the arc-extinguishing chamber (10) and the second arc-starting plate (12). When the moving contact (30) is in the closed position, the body part (31) abuts against the stationary contact (20), and when the moving contact (30) is in the open position, the protrusion (32) abuts against the second arc-drawing piece (12).

2. The contact assembly (100) according to claim 1, characterized in that, The protrusion (32) includes an arc-shaped surface (321) on the side near the arc-extinguishing chamber (10) and a flat surface (322) on the side near the second arc-inducing plate (12), wherein the arc-shaped surface (321) and the flat surface (322) form a sharp corner at their intersection.

3. The contact assembly (100) according to claim 1, characterized in that, The second arc-starting plate (12) includes: The first part (121) is disposed at the corresponding end of the arc-extinguishing chamber (10); and The second part (122) is disposed on the side of the arc-extinguishing chamber (10) near the moving contact (30) and connected to the first part (121), and is adapted to abut against the moving contact (30) in the disconnected position.

4. The contact assembly (100) according to claim 3, characterized in that, The second part (122) includes a first connecting segment (1221), a second connecting segment (1222) and a third connecting segment (1223) arranged sequentially. The first connecting segment (1221) is connected to the first part (121), the extension direction of the second connecting segment (1222) has a first included angle (A1) between the extension direction of the second connecting segment (1222) and the extension direction of the first connecting segment (1221), and the extension direction of the third connecting segment (1223) has a second included angle (A2) between the extension direction of the third connecting segment (1223) and the extension direction of the first connecting segment (1221), and the second included angle (A2) is smaller than the first included angle (A1), so that the third connecting segment (1223) abuts against the moving contact (30) located at the disconnected position.

5. The contact assembly (100) according to claim 4, characterized in that, The third connecting segment (1223) includes a tip that gradually tapers from the second connecting segment (1222) toward the moving contact (30).

6. The contact assembly (100) according to any one of claims 1 to 5, characterized in that, Also includes: The rotating member (40) is rotatably coupled to the position to be installed and to the moving contact (30) so that the moving contact (30) switches between the closed position and the open position during rotation.

7. The contact assembly (100) according to any one of claims 1 to 5, characterized in that, The arc-extinguishing chamber (10) includes: Multiple metal grids (101) spaced apart from each other; and An insulating support (102) is coupled to the plurality of metal grids (101).

8. The contact assembly (100) according to claim 7, characterized in that, Each metal grid (101) includes a groove (1010) disposed on one side near the moving contact (30), the moving contact (30) corresponding to the opening of the corresponding groove (1010) during position switching.

9. The contact assembly (100) according to claim 8, characterized in that, The end of the moving contact (30) near the arc-extinguishing chamber (10) passes through the first stroke segment and the second stroke segment in sequence as it moves from the closed position to the open position; The distance between the moving contact (30) and the inner wall of the corresponding groove (1010) in the second stroke segment is greater than the distance between the moving contact (30) and the inner wall of the corresponding groove (1010) in the first stroke segment.

10. A circuit breaker (500), characterized in that, include: Casing (510); as well as The contact assembly (100) according to any one of claims 1 to 9 is disposed within the housing (510), and the moving contact (30) is movably coupled to the housing (510).

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