An arc extinguishing system for a circuit breaker and the circuit breaker

Abstract

The application discloses a circuit breaker arc extinguishing system, which comprises an arc extinguishing chamber (1) and a contact system (2), wherein the contact system (2) comprises a movable contact system (201) and a static contact system (202); the movable contact system (201) and the static contact system (202) are connected or disconnected to control the on-off of a circuit breaker circuit; the movable contact system (201) and the static contact system (202) are combined or disconnected twice in sequence from front to back, and are respectively located outside the arc extinguishing chamber (1) and inside the arc extinguishing chamber (1), so that an arc can not be generated and extinguished outside the arc extinguishing chamber (1), and can only be generated and extinguished inside the arc extinguishing chamber (1). The circuit breaker arc extinguishing system and the circuit breaker can enhance the arc extinguishing capacity of the arc extinguishing chamber by improving the structure of the circuit breaker arc extinguishing system, and ensure that the electrical life and breaking capacity of the frame circuit breaker meet the requirements of relevant standards.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an arc extinguishing system of a circuit breaker and the circuit breaker, which is applicable to DC and AC power supply systems. Background Art

[0002] Circuit breakers are the most important distribution equipment in low-voltage power distribution systems. As power engineering teams' power supply and transmission and distribution equipment requirements continue to rise, so too are the performance requirements for circuit protection switches. Miniaturization, high performance, modularization, and high reliability are currently the primary development directions for air circuit breakers. Contacts and arc extinguishing systems are crucial components of circuit breakers. The shape and size of the contacts in the contact system are crucial, directly impacting the circuit breaker's electrical life and breaking capacity.

[0003] At the same time, with the rapid development of renewable energy, DC power systems have also seen significant growth. However, currently used frame circuit breakers are primarily used in AC power systems, with fewer being used for DC power systems. Because DC systems lack the natural zero-crossing phenomenon of AC systems, arc extinguishing cannot be achieved by extinguishing the arc at the instant the AC current crosses zero, as is the case with AC. Instead, the arc can only be extinguished by rapidly lengthening and cooling the arc until the arc voltage exceeds the power supply voltage. This makes extinguishing the arc in DC arcs quite difficult. Chinese patent ZL201621171400.X discloses an arc extinguishing system for a DC molded case circuit breaker, comprising a static contact, an arc extinguishing chamber and an arc extinguishing hood disposed on the static contact. The arc extinguishing chamber comprises two arc-isolating plates disposed on the static contact, and arc-extinguishing grids evenly spaced between the two arc-isolating plates. The arc extinguishing hood comprises two spaced wall panels closely disposed on the static contact, one end of each wall panel also abutting the arc extinguishing grids. This allows the arc extinguishing hood, arc extinguishing chamber, and static contact to form a relatively enclosed air chamber within which the moving contact of the circuit breaker moves. This DC molded case circuit breaker solves the problem of arc extinguishing difficulties with low currents and improves its short-circuit breaking capability. However, the arc generated by the circuit breaker cannot be completely extinguished and can easily overflow the arc extinguishing chamber, posing a safety hazard to the circuit breaker. Summary of the Invention

[0004] The purpose of the present invention is to address the technical problem that the existing frame circuit breaker is difficult to extinguish the arc in the DC system, and to provide an arc extinguishing system and the circuit breaker. By improving the structure of the circuit breaker arc extinguishing system, the arc extinguishing ability of the arc extinguishing chamber is enhanced, ensuring that the electrical life and breaking capacity of the frame circuit breaker meet the relevant standard requirements.

[0005] Technical Solution

[0006] To achieve the above technical objectives, the present invention provides an arc extinguishing system for a circuit breaker, comprising an arc extinguishing chamber and a contact system. The contact system comprises a movable contact system and a stationary contact system. The engagement or disconnection of the movable contact system and the stationary contact system controls the on / off state of the circuit breaker. The system is characterized in that:

[0007] The moving contact system includes a long moving contact assembly, and short moving contact assemblies are arranged on both sides or one side of the long moving contact assembly. The long moving contact assembly and the short moving contact assembly can rotate around the same rotation center. The long moving contact assembly is provided with a front long moving contact and a rear long moving contact in sequence, and the short moving contact assembly is provided with a short moving contact.

[0008] The static contact system includes a static contact plate, on which a front static contact and a rear static contact are provided, wherein the front static contact corresponds to the front long movable contact, and the rear static contact corresponds to the rear long movable contact and the short movable contact;

[0009] The front static contact and the front long moving contact are located inside the arc extinguishing chamber, and the rear static contact, the rear long moving contact and the short moving contact are located outside the arc extinguishing chamber;

[0010] During the engagement of the movable contact system and the stationary contact system, the front stationary contact contacts the front long movable contact before the rear stationary contact contacts the rear long movable contact and the short movable contact;

[0011] During the disconnection process of the moving contact system and the static contact system, the front static contact and the front long moving contact are disconnected later than the connection between the rear static contact and the rear long moving contact and the short moving contact.

[0012] Furthermore, the rear long movable contact and the short movable contact are located on the same horizontal plane, and the front long movable contact is located above the rear long movable contact and the short movable contact;

[0013] Furthermore, the arc extinguishing chamber includes a left partition and a right partition, and the two ends of the arc extinguishing grid group are respectively inserted on the left partition and the right partition, a top arc extinguishing grid is provided at the upper end of the arc extinguishing grid group, and the two ends of the top arc extinguishing grid are inserted on the left partition and the right partition, an arc-starting grid is provided above the top arc extinguishing grid, and the arc-starting grid is inserted on the left partition and the right partition, feet extend from both sides of the front end of the arc extinguishing grid group, and a gas-generating hood covers the feet and is located below the top arc extinguishing grid, and the front static contact and the front long moving contact are located in the arc extinguishing chamber formed by the left partition, the right partition, the arc extinguishing grid group and the gas-generating hood.

[0014] Preferably, the long moving contact assembly is longer than the short moving contact assembly.

[0015] Preferably, the arc extinguishing grid group includes a plurality of arc extinguishing grids, and the plurality of arc extinguishing grids are arranged at equal intervals. The horizontal distance between the plurality of arc extinguishing grids and the front static contact gradually increases from the bottom of the arc extinguishing grid group upward, then gradually decreases to the middle of the arc extinguishing grid group, then gradually increases from the middle of the arc extinguishing grid group upward, and finally gradually decreases to the arc striking grid at the top of the arc extinguishing grid group in a "3" shape.

[0016] Preferably, the inner cavity of the gas generating hood is in the shape of a "3" corresponding to the arc extinguishing grid group.

[0017] Preferably, the arc-striking end of the arc-striking grid is a downward three-fold structure, and the contact end of the long moving contact assembly is an upward hook-shaped protrusion. When the moving contact system and the static contact system are disconnected, an M-shaped current path can be formed between the arc-striking end of the arc-striking grid and the contact end of the long moving contact assembly.

[0018] Preferably, the outer contour of the hook-shaped protruding contact end of the long moving contact assembly is triangular, and the front end sharp angle is an obtuse angle, and the sharp angle point is located in the lower middle position of the triangle. The contact end of the short moving contact assembly is a hook-shaped protrusion, and the outer contour of the hook-shaped protruding contact end of the short moving contact assembly is an arc shape.

[0019] Furthermore, an arc striking angle is provided at the front end of the static contact plate in front of the front static contact, the rear end of the arc striking angle is flush with the front static contact, the arc striking angle is a trapezoidal dovetail shape, and the width of the arc striking angle gradually increases from the side of the front static contact to the side away from the front static contact.

[0020] Furthermore, the front long moving contact, rear long moving contact, short moving contact, front static contact, rear static contact and the corresponding long moving contact assembly, short moving contact assembly, and static contact plate are made of the same or different materials to form a split or integrated structure.

[0021] The present invention also provides a circuit breaker comprising the arc extinguishing system.

[0022] Beneficial effects

[0023] The present invention provides an arc extinguishing system and circuit breaker. By improving the structure of the arc extinguishing system, the arc extinguishing capability of the arc extinguishing chamber is enhanced, ensuring that the electrical life and breaking capacity of the frame circuit breaker in DC systems meet relevant standards. Furthermore, through practical application, the circuit breaker can also be used in AC systems, similarly meeting the requirements for rapid arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1a It is a product schematic diagram of an embodiment of the present invention.

[0025] Attachment Figure 1bIt is a schematic diagram of the product structure of an embodiment of the present invention.

[0026] Attachment Figure 2 It is a schematic diagram of the decomposition structure of an embodiment of the present invention.

[0027] Attachment Figure 3 Schematic diagram of the structure of the contact system located inside the arc extinguishing chamber in an embodiment of the present invention.

[0028] Attachment Figure 4 It is a schematic diagram of the contact system structure in the implementation of the present invention.

[0029] Attachment Figure 5 It is a schematic structural diagram of the long moving contact assembly in the implementation of the present invention.

[0030] Attachment Figure 6 It is a schematic structural diagram of the short moving contact assembly in the implementation of the present invention.

[0031] Attachment Figure 7 It is a schematic diagram of the internal structure of the arc extinguishing chamber in the implementation of the present invention.

[0032] Attachment Figure 8 Schematic diagram of the arc extinguishing grid structure in an embodiment of the present invention.

[0033] Attachment Figure 9 Schematic diagram of the top arc quenching grid structure in an embodiment of the present invention.

[0034] Attachment Figure 10 Schematic diagram of the arc striking grid structure in an embodiment of the present invention.

[0035] Attachment Figure 11 Schematic diagram of the arc striking angle structure in an embodiment of the present invention.

[0036] Attachment Figure 12 It is a structural schematic diagram of the contact system engagement process in an embodiment of the present invention.

[0037] Attachment Figure 13 It is a structural schematic diagram of the disconnection process of the contact system in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example

[0040] As attached Figure 1a 、 1b As shown in FIG2 , an arc extinguishing system for a circuit breaker includes an arc extinguishing chamber 1 and a contact system 2. The contact system 2 includes a movable contact system 201 and a stationary contact system 202. The engagement or disconnection of the movable contact system 201 and the stationary contact system 202 controls the on / off state of the circuit breaker.

[0041] As attached Figure 4 As shown, the moving contact system 201 includes a long moving contact assembly 201a, and short moving contact assemblies 201b are arranged on both sides or one side of the long moving contact assembly 201a. The long moving contact assembly 201a is longer than the short moving contact assembly 201b. The long moving contact assembly 201a and the short moving contact assembly 201b can rotate around the same rotation center. Figure 5 As shown, the long moving contact assembly 201a is provided with a front long moving contact 201a01 and a rear long moving contact 201a02 in sequence. Figure 6 As shown, the short movable contact assembly 201b is provided with a short movable contact 201b01, the rear long movable contact 201a02 and the short movable contact 201b01 are located on the same horizontal plane, and the front long movable contact 201a01 is located above the rear long movable contact 201a02 and the short movable contact 201b01;

[0042] As attached Figure 2 、 3 As shown in FIG4 , the static contact system 202 includes a static contact plate 202a, on which a front static contact 202a01 and a rear static contact 202a02 are provided. The front static contact 202a01 corresponds to the front long movable contact 201a01, and the rear static contact 202a02 corresponds to the rear long movable contact 201a02 and the short movable contact 201b01. Figure 3 As shown, the front static contact 202a01 and the front long moving contact 201a01 are located inside the arc extinguishing system 1, and the rear static contact 202a02, the rear long moving contact 201a02 and the short moving contact 201b01 are located outside the arc extinguishing chamber 1;

[0043] In this embodiment, the front long moving contact 201a01, the rear long moving contact 201a02, the short moving contact 201b01, the front static contact 202a01, and the rear static contact 202a02 are respectively made of the same or different materials as the corresponding long moving contact assembly 201a, the short moving contact assembly 201b, and the static contact plate 202a, and the corresponding structures are made into a split type or an integrated type.

[0044] As attached Figure 1a 、 1b As shown in FIG. 2 and FIG. 3 , the arc extinguishing chamber 1 includes a left partition 101 and a right partition 102. The two ends of the arc extinguishing grid group 103 are respectively inserted into the left partition 101 and the right partition 102. Figure 7 、 8As shown in Figure 9, a top arc-extinguishing grid 104 is provided at the upper end of the arc-extinguishing grid group 103, and both ends of the top arc-extinguishing grid 104 are inserted on the left partition 101 and the right partition 102. An arc-starting grid 105 is provided above the top arc-extinguishing grid 104, and the arc-starting grid 105 is inserted on the left partition 101 and the right partition 102. Feet 103a01 extend from both sides of the front end of the arc-extinguishing grid group 103, and the gas-generating hood 106 covers the feet 103a01 and is located below the top arc-extinguishing grid 104. The front static contact 202a01 and the front long moving contact 201a01 are located in the arc-extinguishing chamber formed by the left partition 101, the right partition 102, the arc-extinguishing grid group 103 and the gas-generating hood 106. The arc-quenching grid assembly 103 includes a plurality of arc-quenching grids 103a, which are arranged at equal intervals. The horizontal distance between the arc-quenching grids 103a and the front static contact 202a01 gradually increases from the bottom of the arc-quenching grid assembly 103 upward, then gradually decreases toward the middle of the arc-quenching grid assembly 103. Then, the distance increases again from the middle of the arc-quenching grid assembly 103 upward, and finally, the distance gradually increases toward the arc-strike grid 105 at the top of the arc-quenching grid assembly 103, forming a "3" shape. The inner cavity of the gas generating hood 106 is shaped like a "3" to correspond to the arc-quenching grid assembly 103. Specifically, in this embodiment, the arc-extinguishing grid group 103 includes a total of 18 arc-extinguishing grids 103a arranged at equal intervals from bottom to top; the horizontal distances between the 1st to 11th arc-extinguishing grids 103a and the front static contact 202a01 gradually increase from close to each other; the horizontal distances between the 12th and 13th arc-extinguishing grids 103a and the front static contact 202a01 become closer again; the horizontal distances between the 14th to 18th arc-extinguishing grids 103a and the front static contact 202a01 again gradually increase from close to each other; and the horizontal distance between the arc-strike grid 105 and the front static contact 202a01 again becomes closer.

[0045] As attached Figure 10 As shown, the arc striking end 105a of the arc striking grid 105 is a downward three-bend structure. Figure 2 、 3As shown in Figures 4 and 5, the contact end 201a03 of the long movable contact assembly 201a is a hook-shaped protrusion. The outer contour of the hook-shaped protrusion contact end 201a03 of the long movable contact assembly 201a is triangular, with an obtuse angle at the front end, and the angle point is located in the lower middle part of the triangle. The contact end 201b02 of the short movable contact assembly 201b is a hook-shaped protrusion. The outer contour of the hook-shaped protrusion contact end 201b02 of the short movable contact assembly 201b is an arc-shaped protrusion. When the movable contact system 201 and the stationary contact system 202 are disconnected, an M-shaped current path can be formed between the arc-striking end 105a of the arc-striking grid 105 and the contact end 201a03 of the long movable contact assembly 201a. The three-bend structure of the arc striking end 105a will greatly enhance the electric field strength there, which will be more conducive to leading the arc to the top of the arc extinguishing chamber 1, lengthening the arc length to increase the arc voltage, and will greatly improve the breaking capacity.

[0046] At the same time, as attached Figure 4 As shown, the front end of the static contact plate 202a is located in front of the front static contact 202a01 and is provided with an arc striking angle 202a03. The rear end of the arc striking angle 202a03 is flush with the front static contact 202a01. Figure 11 As shown, the arc striking angle 202a03 is trapezoidal and dovetail-shaped, with its width gradually increasing from the side of the front static contact 202a01 toward the side away from the front static contact 202a01. The trapezoidal dovetail-shaped arc striking angle 202a03 increases the electromagnetic field strength at the front static contact 202a01, facilitating arc transfer away from the front static contact 202a01. Simultaneously, the tri-shaped arc extinguishing grid assembly 103 also enhances the magnetic field strength there, accelerating arc transfer and rapidly guiding the arc root to the bottom of the arc extinguishing grid assembly 103 and toward the rear end of the arc extinguishing chamber 1. This helps lengthen the arc, increase the arc voltage, and enhance arc interruption capability.

[0047] As attached Figure 12 As shown, when the movable contact system 201 and the stationary contact system 202 are engaged, the front stationary contact 202a01 contacts the front long movable contact 201a01 before the rear stationary contact 202a02 contacts the rear long movable contact 201a02 and the short movable contact 201b01;

[0048] As attached Figure 13 As shown, when the moving contact system 201 and the static contact system 202 are disconnected, the connection between the front static contact 202a01 and the front long moving contact 201a01 is disconnected later than the connection between the rear static contact 202a02 and the rear long moving contact 201a02 and the short moving contact 201b01.

[0049] Since the front static contact 202a01 and the front long movable contact 201a01 are disconnected later than the rear static contact 202a02 and the rear long movable contact 201a02 and the short movable contact 201b01, the arc will only appear between the front static contact 202a01 and the front long movable contact 201a01. In the air medium, at the moment the front static contact 202a01 and the front long movable contact 201a01 disconnect, the resistance and temperature at their contact point continuously increase. When the temperature reaches the melting point of the contact material, a metal bridge of molten metal forms at the contact point. Continued disconnection of the front long movable contact 201a01 breaks the metal bridge, generating an arc. The arc is initially ignited by the metal vapor between the front static contact 202a01 and the front long movable contact 201a01. As the arc is elongated, the surrounding air gradually enters the arc gap, transforming the metal-phase arc into a free-supported gas-phase arc. The gas-phase arc is continuously elongated by the front static contact 202a01 and the front long movable contact 201a01, and is ultimately extinguished by the combined action of the arc-extinguishing grid assembly 103 and the gas-generating hood 106 in the arc-extinguishing chamber 1. The present invention realizes that the arc is only generated between the front static contact 202a01 and the front long moving contact 201a01, that is, the arc is directly generated inside the arc extinguishing chamber 1, eliminating the process of the arc being transferred from the outside to the inside of the arc extinguishing chamber 1; at the same time, the arc generated inside the arc extinguishing chamber 1 will be more effectively compressed and cooled in the narrow space formed by the arc extinguishing grid group 103 and the gas generating hood 106, thereby increasing the arc resistance and improving the arc voltage, and ultimately achieving faster arc extinguishing.

[0050] This embodiment provides an arc extinguishing system and circuit breaker. By improving the structure of the arc extinguishing system, the arc extinguishing capability of the arc extinguishing chamber is enhanced, ensuring that the electrical life and breaking capacity of the frame circuit breaker in DC systems meet relevant standards. Furthermore, through practical application, the circuit breaker can also be used in AC systems, similarly meeting the requirements for rapid arc extinguishing.

[0051] The structures, proportions, sizes, etc. illustrated in the drawings of the embodiments of the present invention are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. An arc extinguishing system for a circuit breaker, comprising an arc extinguishing chamber (1) and a contact system (2), wherein the contact system (2) comprises a movable contact system (201) and a stationary contact system (202), wherein the engagement or disconnection of the movable contact system (201) and the stationary contact system (202) controls the on / off state of the circuit breaker, and is characterized in that: The moving contact system (201) comprises a long moving contact assembly (201a), short moving contact assemblies (201b) are arranged on both sides or one side of the long moving contact assembly (201a), the long moving contact assembly (201a) and the short moving contact assembly (201b) are capable of rotating around the same rotation center, a front long moving contact (201a01) and a rear long moving contact (201a02) are sequentially arranged on the long moving contact assembly (201a), and a short moving contact (201b01) is provided on the short moving contact assembly (201b); The static contact system (202) comprises a static contact plate (202a), the static contact plate (202a) being provided with a front static contact (202a01) and a rear static contact (202a02), the front static contact (202a01) corresponding to the front long movable contact (201a01), and the rear static contact (202a02) corresponding to the rear long movable contact (201a02) and the short movable contact (201b01); The front static contact (202a01) and the front long moving contact (201a01) are located inside the arc extinguishing chamber (1), and the rear static contact (202a02), the rear long moving contact (201a02) and the short moving contact (201b01) are located outside the arc extinguishing chamber (1); During the engagement process of the movable contact system (201) and the stationary contact system (202), the front stationary contact (202a01) contacts the front long movable contact (201a01) before the rear stationary contact (202a02) contacts the rear long movable contact (201a02) and the short movable contact (201b01); During the disconnection process of the moving contact system (201) and the static contact system (202), the front static contact (202a01) and the front long moving contact (201a01) disconnect later than the disconnection between the rear static contact (202a02) and the rear long moving contact (201a02) and the short moving contact (201b01); The arc extinguishing chamber (1) comprises a left partition (101) and a right partition (102); the two ends of an arc extinguishing grid group (103) are respectively inserted into the left partition (101) and the right partition (102); a top arc extinguishing grid (104) is provided at the upper end of the arc extinguishing grid group (103); the two ends of the top arc extinguishing grid (104) are inserted into the left partition (101) and the right partition (102); an arc striking grid (105) is provided above the top arc extinguishing grid (104); the arc striking grid (105) is inserted into the arc extinguishing grid (105); Installed on the left partition (101) and the right partition (102), the arc extinguishing grid group (103) extends from both sides of the front end thereof with feet (103a01), the gas generating hood (106) covers the feet (103a01) and is located below the top arc extinguishing grid (104), and the front static contact (202a01) and the front long moving contact (201a01) are located in the arc extinguishing chamber formed by the left partition (101), the right partition (102), the arc extinguishing grid group (103) and the gas generating hood (106); The arc extinguishing grid group (103) comprises a plurality of arc extinguishing grids (103a), the plurality of arc extinguishing grids (103a) are arranged at equal intervals, and the horizontal distance between the plurality of arc extinguishing grids (103a) and the front static contact (202a01) gradually becomes farther from the bottom of the arc extinguishing grid group (103) upwards, then gradually becomes closer to the middle of the arc extinguishing grid group (103), then gradually becomes farther from the middle of the arc extinguishing grid group (103) upwards, and finally gradually becomes closer to the arc striking grid (105) at the top of the arc extinguishing grid group (103) in the shape of a "3"; The long moving contact assembly (201a) is longer than the short moving contact assembly (201b).

2. The arc extinguishing system of a circuit breaker according to claim 1, characterized in that: The rear long movable contact (201a02) and the short movable contact (201b01) are located on the same horizontal plane, and the front long movable contact (201a01) is located above the rear long movable contact (201a02) and the short movable contact (201b01).

3. The arc extinguishing system of a circuit breaker according to claim 1, characterized in that: The inner cavity of the gas generating hood (106) is in the shape of a "3" corresponding to the arc extinguishing grid plate group (103).

4. The arc extinguishing system of a circuit breaker according to claim 1, characterized in that: The arc-striking end (105a) of the arc-striking grid (105) is a downward three-fold structure, and the contact end (201a03) of the long moving contact assembly (201a) is an upward hook-shaped protrusion. When the moving contact system (201) and the static contact system (202) are disconnected, an M-shaped current path can be formed between the arc-striking end (105a) of the arc-striking grid (105) and the contact end (201a03) of the long moving contact assembly (201a).

5. The arc extinguishing system of a circuit breaker according to claim 4, characterized in that: The outer contour of the hook-shaped protruding contact end (201a03) of the long moving contact assembly (201a) is triangular, and the front end sharp angle is an obtuse angle, and the sharp angle point is located in the middle and lower part of the triangle; the contact end (201b02) of the short moving contact assembly (201b) is a hook-shaped protrusion, and the outer contour of the hook-shaped protruding contact end (201b02) of the short moving contact assembly (201b) is arc-shaped.

6. The arc extinguishing system of a circuit breaker according to claim 1, characterized in that: The front end of the static contact plate (202a) is located in front of the front static contact (202a01) and is provided with an arc striking angle (202a03). The rear end of the arc striking angle (202a03) is flush with the front static contact (202a01). The arc striking angle (202a03) is in a trapezoidal swallowtail shape. The width of the arc striking angle (202a03) gradually increases from the side located at the front static contact (202a01) to the side away from the front static contact (202a01).

7. The arc extinguishing system of a circuit breaker according to claim 1, characterized in that: The front long moving contact (201a01), the rear long moving contact (201a02), the short moving contact (201b01), the front static contact (202a01), the rear static contact (202a02), and the corresponding long moving contact assembly (201a), the short moving contact assembly (201b), and the static contact plate (202a) are made of the same or different materials to form a split or integrated structure.

8. A circuit breaker, characterized in that: It comprises the arc extinguishing system according to any one of claims 1 to 7.

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