Circuit breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and particularly relates to a circuit breaker. The circuit breaker includes a housing, and an operating mechanism, a moving contact member and a static contact disposed within the housing. The operating mechanism is drivingly connected to the moving contact member to drive the moving contact member to close / open with the static contact. The operating mechanism includes a handle pivotally disposed on the housing, a connecting rod, a contact spring, a support assembly, a locking member and a tripping member. The handle is drivingly connected to the support assembly through the connecting rod. The support assembly and the moving contact member are respectively pivotally disposed on the housing through a second shaft and a first shaft. The support assembly includes a contact support member and a connecting rod support member fixedly connected. The contact support member is elastically drivingly connected to the moving contact member through the contact spring. The locking member and the tripping member are in locking cooperation and are respectively pivotally disposed on the connecting rod support member. The handle is connected to the locking member through the connecting rod. The circuit breaker of the present invention is convenient for production and has higher accuracy.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to a circuit breaker. Background Art

[0002] For existing circuit breakers, the internal space of the contact support is limited, and there is insufficient room for optimizing the internal structure; the contact spring is installed on one side, resulting in a large output torque and requiring a large force during assembly; the large output torque is likely to increase the machining error, causing inconsistent dynamic and static contact pressures; moreover, the existing moving contact arm adopts an injection molding insert process, and there is an active gap reserved for installing the moving contact on the injection mold, causing deviation between the contact support and the working spindle of the moving contact, increasing production losses. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a circuit breaker that is convenient for production and has higher accuracy.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A circuit breaker, the circuit breaker includes a housing 3 and an operating mechanism, a moving contact member 1-10 and a static contact 2 arranged inside the housing 3, the operating mechanism is drivingly connected to the moving contact member 1-10 to drive the moving contact member 1-10 to close / open with the static contact 2;

[0006] The operating mechanism includes a handle 4 pivotally arranged on the housing 3, a connecting rod 5, a contact spring 16, a support assembly 6-7, a locking member 8 and a tripping member 9; the handle 4 is drivingly connected to the support assembly 6-7 through the connecting rod 5, and the support assembly 6-7 and the moving contact member 1-10 are respectively pivotally arranged on the housing 3 through a second shaft 12 and a first shaft 11; the support assembly 6-7 includes a contact support 6 and a connecting rod support 7 fixedly connected, the contact support 6 is elastically drivingly connected to the moving contact member 1-10 through the contact spring 16, the locking member 8 and the tripping member 9 are in locking cooperation and are respectively pivotally arranged on the connecting rod support 7, and the handle 4 is connected to the locking member 8 through the connecting rod 5.

[0007] Preferably, the support assembly 6-7 further includes an avoidance structure for avoiding the first shaft 11, the avoidance structure includes a first kidney-shaped hole 601 and a second kidney-shaped hole 701 respectively arranged on the contact support 6 and the connecting rod support 7, and the first kidney-shaped hole 601 and the second kidney-shaped hole 701 are correspondingly arranged for the first shaft 11 to pass through.

[0008] Preferably, when the handle 4 rotates, it drives the support assembly 6-7 to rotate around the second shaft 12 through the connecting rod 5. At the same time, the contact support 6 drives the moving contact member 1-10 to rotate around the first shaft 11 through the contact spring 16 until the moving contact member 1-10 is initially in contact with the static contact 2. When the handle 4 continues to rotate and drives the support assembly 6-7 to continue to rotate around the second shaft 12, the support assembly 6-7 moves relative to the moving contact member 1-10, and the contact spring 16 is compressed, and the circuit breaker enters the closing state.

[0009] Preferably, the contact support 6 is integrally formed in a U-shaped structure, including a connecting plate 63 and a first plate 61 and a second plate 62 that are respectively bent and connected to the connecting plate 63 and are arranged oppositely; the connecting rod support 7 includes a base plate 70 and a connecting arm 71. The base plate 70 is arranged outside the first plate 61 and is connected to the first plate 61. One end of the connecting arm 71 is connected to the base plate 70, and the other end is connected to the second plate 62; one end of the moving contact member 1-10 is inserted between the first plate 61 and the second plate 62 and is elastically driven and connected to the contact support 6 at this end.

[0010] Preferably, the contact support 6 is formed by bending and stamping a metal plate; the connecting rod support 7 is an injection molded part.

[0011] Preferably, the connecting rod support 7 further includes a locking shaft 706 and a tripping shaft 707 provided on the base plate 70. The locking shaft 706 and the tripping shaft 707 are arranged on one side of the base plate 70, and the connecting arm 71 is arranged on the other side of the base plate 70. The locking member 8 and the tripping member 9 are respectively pivotally arranged on the base plate 70 through the locking shaft 706 and the tripping shaft 707.

[0012] Preferably, the connecting rod support 7 further includes a first connecting boss 703 and a second connecting boss 704 respectively provided at the free ends of the base plate 70 and the connecting arm 71; the contact support 6 further includes a first connecting hole 603 and a second connecting hole 604 respectively provided on the first plate 61 and the second plate 62; the first connecting boss 703 and the second connecting boss 704 are respectively inserted and matched with the first connecting hole 603 and the second connecting hole 604.

[0013] Preferably, the contact spring 16 is a torsion spring. Two contact springs 16 are respectively arranged on both sides of the moving contact member 1-10 and are both sleeved on the first shaft 11. Both ends of each contact spring 16 are respectively connected to the contact support 6 and the moving contact member 1-10.

[0014] Preferably, when the circuit breaker trips or opens, the contact spring 16 drives the moving contact member 1-10 to rotate, so that one end of the moving contact member 1-10 inserted between the first plate 61 and the second plate 62 is in limit fit with the connecting arm 71.

[0015] Preferably, the contact support 6 further includes two spring limiting arms 602 respectively disposed on the first plate 61 and the second plate 62 and oppositely arranged. The contact spring 16 is a torsion spring. The two contact springs 16 are respectively disposed on both sides of the moving contact member 1-10 and are both sleeved on the first shaft 11. One end of each contact spring 16 is connected to the spring limiting arm 602, and the other end is connected to the moving contact member 1-10; the end of the moving contact member 1-10 inserted between the first plate 61 and the second plate 62 is located between the spring limiting arm 602 and the connecting arm 71.

[0016] Preferably, one end of the substrate 70 is provided with a closing and opening indication portion 705. The closing and opening indication portion 705 includes a closing indication surface 7500 and a opening indication surface 7051 arranged side by side; an indication hole cooperating with the closing and opening indication portion 705 is provided on the housing 3; when the circuit breaker is in the closing state, the closing indication surface 7500 is opposite to the indication hole and is observed, and when the circuit breaker is in the opening state, the opening indication surface 7051 is opposite to the indication hole and is observed.

[0017] Preferably, the contact support 6 is integrally formed in a U-shaped structure, which includes a connecting plate 63 and oppositely arranged first plate 61 and second plate 62. Both the first plate 61 and the second plate 62 include connecting edges. One ends of the connecting edges of the first plate 61 and the second plate 62 are respectively connected to both ends of the connecting plate 63. The other ends of the connecting edges of the first plate 61 and the second plate 62 each are provided with a spring limiting arm 602. The two spring limiting arms 602 are oppositely arranged. The first plate 61 and the second plate 62 are both provided with first kidney-shaped holes 601 for avoiding the first shaft 11 and contact support shaft holes 605 cooperating with the second shaft 12. Each first kidney-shaped hole 601 is located between the spring limiting arm 602 and the connecting plate 63. The contact support shaft hole 605 is disposed on one side of the first kidney-shaped hole 601 and is close to the connecting plate 63. The first plate 61 is further provided with a first connection hole 603 at the end away from the spring limiting arm 602 and the connecting plate 63. The second plate 62 is further provided with a second connection hole 604, and the second connection hole 604 is close to the spring limiting arm 602.

[0018] Preferably, the connecting rod support 7 includes a base plate 70 and a connecting arm 71. One end of the connecting arm 71 is perpendicularly connected to one side of the base plate 70. The other end of the connecting arm 71 is provided with a second connecting boss 704. One side of the connecting arm 71 is provided with a limiting plane 702 that is in limiting cooperation with the moving contact member 1-10. The other side of the base plate 70 is provided with a locking shaft 706 and a tripping shaft 707. The base plate 70 is further provided with a second waist-shaped hole 701 for avoiding the first shaft 11 and a connecting rod support shaft hole 708 for cooperating with the second shaft 12. The connecting arm 71 and the connecting rod support shaft hole 708 are respectively located at both ends of the base plate 70. The second waist-shaped hole 701 is located between the connecting arm 71 and the connecting rod support shaft hole 708. The locking shaft 706 and the tripping shaft 707 are located on one side of the second waist-shaped hole 701 and the connecting rod support shaft hole 708. A closing and opening indication portion 705 is further provided at the edge of the base plate 70 close to the connecting arm 71. The closing and opening indication portion 705 includes a closing indication surface 7500 and a tripping indication surface 7051 arranged side by side.

[0019] Preferably, the moving contact member 1-10 includes a contact support 10 and a moving contact 1. One end of the moving contact 1 is inserted into the contact support 10, and the other end is in cooperation with the static contact 2. The contact support 10 includes a contact slot 104 and a moving contact shaft hole 101. The contact slot 104 is provided in the middle of the contact support 10. The moving contact shaft hole 101 penetrates the contact support 10 in the thickness direction of the contact support 10. The moving contact 1 includes a moving contact limiting groove 101a provided on one of its side edges. One end of the moving contact 1 is inserted into the contact slot 104. The first shaft 11 passes through the moving contact shaft hole 101 and is in limiting cooperation with the moving contact limiting groove 101a to prevent the moving contact 1 from disengaging from the contact slot 104. The contact support 6 is elastically driven and connected to the contact support 10 through a contact spring 16.

[0020] Preferably, the contact support 10 further includes a first support limiting portion 105. The first support limiting portion 105 is located at the edge of the contact support 10 opposite to the moving contact 1. The first support limiting portion 105 is located between the spring limiting arm 602 of the contact support 6 and the connecting arm 71 of the connecting rod support 7. When the circuit breaker trips or opens, the contact spring 16 drives the moving contact member 1-10 to rotate, so that the first support limiting portion 105 is in limiting cooperation with the connecting arm 71.

[0021] Preferably, the contact support 10 further includes two second support limiting portions 106 respectively provided on both sides thereof. The distance between the free ends of the two second support limiting portions 106 matches the distance between the first plate 61 and the second plate 62 of the contact support 6. A limiting rib 1050 for limiting cooperation with the limiting plane 702 of the connecting arm 71 is provided on one side of the first support limiting portion 105.

[0022] Preferably, when the circuit breaker trips or switches off, the first displacement rotation angle α of the support component 6-7 around the second shaft 12 is less than the second displacement rotation angle β of the moving contact member 1-10 around the first shaft 11.

[0023] Preferably, one mounting boss 30 is provided on each of the pair of side walls of the housing 3. A first shaft mounting hole 301 and a second shaft mounting hole 302 are provided on each mounting boss 30. Both ends of the first shaft 11 are respectively arranged in the two first shaft mounting holes 301, and both ends of the second shaft 12 are respectively arranged in the two second shaft mounting holes 302.

[0024] Preferably, the operating mechanism further includes a support component return spring, and the circuit breaker further includes a short-circuit protection mechanism and an overload protection mechanism that are respectively in driving cooperation with the trip fastener 9; when a short-circuit or overload fault occurs, the short-circuit protection mechanism or the overload protection mechanism drives the trip fastener 9 to rotate, so that the trip fastener 9 releases the locking cooperation with the locking fastener 8, the support component return spring drives the support component 6-7 to rotate, and at the same time the contact spring 16 drives the moving contact member 1-10 to reset, so that the moving contact member 1-10 is disconnected from the static contact 2.

[0025] In the operating mechanism of the circuit breaker of the present invention, the support component 6-7 is divided into a contact support member 6 and a connecting rod support member 7, which is beneficial to reducing the structural complexity of a single component, reducing the production difficulty, and it is easier to control the manufacturing precision of the components, effectively reducing the component loss. In addition, the contact support member 6 is manufactured by a metal sheet metal process, and the connecting rod support member is manufactured by an injection molding process. The thickness of the contact support member 6 is significantly reduced, occupying less space. After being assembled with the connecting rod support member 7, there is still remaining space for optimizing and improving the internal components.

[0026] Furthermore, in the circuit breaker of the present invention, a contact spring 16 is provided on each side of the moving contact member 1-10, avoiding the situation that when the contact spring is installed on one side of the moving contact member 1-10, the output torque of the contact spring is large and it is easy to generate machining errors. Furthermore, the contact support 10 is separately injection molded and assembled with the moving contact 1, which is beneficial to controlling the manufacturing precision of the components and reducing the component loss. When the moving contact 1 needs to be replaced due to contact loss during long-term use, only the moving contact 1 needs to be replaced, and the contact support 10 can continue to be used. Or if the contact support 10 is deformed and cannot be used due to long-term use, only the contact support 10 needs to be replaced, and the moving contact 1 can continue to be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A is an exploded structural schematic diagram of the operating mechanism of the circuit breaker of the present invention;

[0028] Figure 1B is of the present invention Figure 1A amplified structural schematic diagram of part A;

[0029] Figure 1C is the enlarged structural schematic diagram of part B of the present invention Figure 1A ;

[0030] Figure 2 is the structural schematic diagram of the contact support 6 of the present invention

[0031] Figure 3 is the structural schematic diagram of the connecting rod support 7 of the present invention

[0032] Figure 4 is the structural schematic diagram of the contact holder 10 of the present invention

[0033] Figure 5 is the schematic diagram of the assembly process of the contact holder 10 and the moving contact 1 of the present invention

[0034] Figure 6 is the assembled structural schematic diagram of the moving contact 1, the contact holder 10, the contact support 6 and the connecting rod support 7 of the present invention

[0035] Figure 7A is the structural schematic diagram of the operating mechanism of the circuit breaker of the present invention, at least showing the first displacement rotation angle α of the moving contact 1 around the first axis 11 and the second displacement rotation angle β of the contact support 6 around the second axis 12 when the circuit breaker switches from closing to opening

[0036] Figure 7B is the structural schematic diagram of the operating mechanism of the circuit breaker of the present invention, at this time the circuit breaker is in the open state

[0037] Figure 7C is the present invention Figure 7B ;

[0038] Figure 7D is the structural schematic diagram of the operating mechanism of the circuit breaker of the present invention, at least showing the cooperation relationship between the contact holder 10 and the connecting rod support 7 when the circuit breaker is in the open state

[0039] Figure 7E is the structural schematic diagram of the operating mechanism of the circuit breaker of the present invention, at this time the circuit breaker is in the closed state

[0040] Figure 8 is the projected structural schematic diagram of the operating mechanism of the circuit breaker of the present invention Specific Embodiments

[0041] The following further illustrates the specific embodiments of the circuit breaker of the present invention in conjunction with the embodiments given below. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments Figure 1A-8 ;

[0042] The circuit breaker of the present invention includes a housing 3, as well as an operating mechanism, a moving contact member 1-10, and a static contact 2 disposed within the housing 3. The operating mechanism is drivingly connected to the moving contact member 1-10 to drive the moving contact member 1-10 to close / open with the static contact 2;

[0043] The operating mechanism includes a handle 4 pivotally disposed on the housing 3, a connecting rod 5, a contact spring 16, a support assembly 6-7, a locking member 8, and a tripping member 9; the handle 4 is drivingly connected to the support assembly 6-7 through the connecting rod 5, and the support assembly 6-7 and the moving contact member 1-10 are respectively pivotally disposed on the housing 3 through a second shaft 12 and a first shaft 11; the support assembly 6-7 includes a contact support member 6 and a connecting rod support member 7 fixedly connected, the contact support member 6 is elastically drivingly connected to the moving contact member 1-10 through the contact spring 16, the locking member 8 and the tripping member 9 are in locking cooperation and are respectively pivotally disposed on the connecting rod support member 7, and the handle 4 is connected to the locking member 8 through the connecting rod 5.

[0044] For the operating mechanism of the circuit breaker of the present invention, its support assembly 6-7 is divided into a contact support member 6 and a connecting rod support member 7, which is beneficial to reducing the structural complexity of a single component, reducing the production difficulty, and the manufacturing precision of the components is easier to control, effectively reducing component loss.

[0045] It should be noted that the "elastically drivingly connected to the moving contact member 1-10 through the contact support member 6 and the contact spring 16" means that the contact support member 6 is elastically connected to the moving contact member 1-10 through the contact spring 16, and the contact support member 6 drives the moving contact member 1-10 to act through the contact spring 16.

[0046] Preferably, as Figure 2 、 3 、6, 7A and 7B show, the support assembly 6-7 further includes an avoidance structure for avoiding the first shaft 11. The avoidance structure includes first kidney-shaped holes 601 and second kidney-shaped holes 701 respectively disposed on the contact support member 6 and the connecting rod support member 7, and the first kidney-shaped holes 601 and the second kidney-shaped holes 701 are correspondingly disposed for the first shaft 11 to pass through.

[0047] Preferably, as Figure 7B and 7EAs shown, when the handle 4 rotates, it drives the support assembly 6-7 to rotate around the second shaft 12 through the connecting rod 5. At the same time, the contact support 6 drives the moving contact member 1-10 to rotate around the first shaft 11 through the contact spring 16 until the moving contact member 1-10 makes initial contact with the static contact 2. When the handle 4 continues to rotate and drives the support assembly 6-7 to continue rotating around the second shaft 12, the support assembly 6-7 moves relative to the moving contact member 1-10, and the contact spring 16 is compressed, and the circuit breaker enters the closing state. It should be noted that the "until the moving contact member 1-10 makes initial contact with the static contact 2" refers to the moment when the moving contact 1-10 and the static contact 2 start to contact.

[0048] Preferably, as Figure 2 , 3 and 6 show, the contact support 6 is integrally U-shaped, including a connecting plate 63 and a first plate 61 and a second plate 62 that are bent and connected to the connecting plate 63 and arranged oppositely. The connecting rod support 7 includes a base plate 70 and a connecting arm 71. The base plate 70 is arranged on one side of the first plate 61 and connected to it. One end of the connecting arm 71 is connected to the base plate 70, and the other end is connected to the second plate 62. One end of the moving contact member 1-10 is inserted between the first plate 61 and the second plate 62 and is elastically driven and connected to the contact support 6. Further, as Figure 2 , 3 and 6 show, the contact support 6 is formed by bending and stamping a metal plate; the connecting rod support 7 is an injection molding. The contact support 6 and the connecting rod support 7 are manufactured separately. The contact support 6 is manufactured by a metal sheet metal process, and the connecting rod support is manufactured by an injection molding process. The thickness of the contact support 6 is significantly reduced, occupying less space. After being assembled with the connecting rod support 7, there is still remaining space for optimizing and improving internal components.

[0049] Preferably, as Figure 6 and 8 show, the contact spring 16 is a torsion spring. Two contact springs 16 are respectively arranged on both sides of the moving contact member 1-10 and are both sleeved on the first shaft 11. Both ends of each contact spring 16 are respectively connected to the contact support 6 and the moving contact member 1-10. In the operating mechanism of the present invention, a contact spring 16 is arranged on each side of the moving contact member 1-10, avoiding the situation that when a contact spring is installed on one side of the moving contact member 1-10, the output torque of the contact spring is large and it is easy to generate manufacturing errors.

[0050] Preferably, as Figure 5 , 6As shown in FIGS. 7D and 7E, the moving contact member 1-10 includes a contact support 10 and a moving contact 1. One end of the moving contact 1 is inserted into the contact support 10, and the other end cooperates with the static contact 2. The contact support 10 includes a contact slot 104 and a moving contact shaft hole 101. The contact slot 104 is provided in the middle of the contact support 10, and the moving contact shaft hole 101 penetrates the contact support 10 in the thickness direction of the contact support 10. The moving contact 1 includes a moving contact limit groove 101a provided on one side edge thereof. One end of the moving contact 1 is inserted into the contact slot 104, and the first shaft 11 passes through the moving contact shaft hole 101 and is in limit cooperation with the moving contact limit groove 101a to prevent the moving contact 1 from disengaging from the contact slot 104. The contact support member 6 is elastically driven and connected to the contact support 10 through the contact spring 16. The contact support 10 is separately injection-molded and assembled with the moving contact 1, which is beneficial to controlling the manufacturing precision of parts and reducing part loss. When the moving contact 1 needs to be replaced due to contact loss during long-term use, only the moving contact 1 needs to be replaced, and the contact support 10 can continue to be used. Or if the contact support 10 is deformed and cannot be used due to long-term use, only the contact support 10 needs to be replaced, and the moving contact 1 can continue to be used.

[0051] As Figure 1A-8 shown, it is an embodiment of the operating mechanism of the circuit breaker of the present invention.

[0052] As Figure 1A 、 7A As shown in FIGS. -7E, for the operating mechanism of the circuit breaker of the present invention, the circuit breaker includes a housing 3 and an operating mechanism, a moving contact member 1-10 and a static contact 2 provided in the housing 3. The operating mechanism is drivingly connected to the moving contact member 1-10 to drive the moving contact member 1-10 to close / open with the static contact 2. As Figure 1A 、 6 and FIG. 8 shown, the operating mechanism includes a handle 4 pivotally provided on the housing 3, a connecting rod 5, a contact spring 16, a support assembly 6-7, a locking member 8 and a tripping member 9. The handle 4 is drivingly connected to the support assembly 6-7 through the connecting rod 5. The support assembly 6-7 and the moving contact member 1-10 are respectively pivotally provided on the housing 3 through a second shaft 12 and a first shaft 11. The support assembly 6-7 includes a contact support member 6 and a connecting rod support member 7 fixedly connected. The contact support member 6 is elastically driven and connected to the moving contact member 1-10 through the contact spring 16. The locking member 8 and the tripping member 9 are in locking cooperation and are respectively pivotally provided on the connecting rod support member 7. The handle 4 is connected to the locking member 8 through the connecting rod 5. Further, as Figure 1A-3As shown in FIGS. 6, 7A-7E, the support assembly 6-7 further includes an avoidance structure for avoiding the first shaft 11. The avoidance structure includes a first waist-shaped hole 60 and a second waist-shaped hole 701 respectively provided on the contact support 6 and the link support 7. The first waist-shaped hole 601 and the second waist-shaped hole 701 are arranged opposite to each other for the first shaft 11 to pass through (it should be noted that the avoidance structure is not limited to the form of waist-shaped holes, and can also be avoidance grooves respectively provided on the contact support 6 and the link support 7). When the handle 4 rotates, the support assembly 6-7 is driven by the link 5 to rotate around the second shaft 12. At the same time, the contact support 6 drives the moving contact member 1-10 to rotate around the first shaft 11 through the contact spring 16 until the moving contact member 1-10 is initially in contact with the static contact 2. When the handle 4 continues to rotate and drives the support assembly 6-7 to continue to rotate around the second shaft 12, the support assembly 6-7 moves relative to the moving contact member 1-10, and the contact spring 16 is compressed, and the circuit breaker enters the closing state.

[0053] Preferably, as Figure 6 shown, one end of the substrate 70 is provided with a closing and opening indication portion 705. The closing and opening indication portion 705 includes a closing indication surface 7500 and a tripping indication surface 7501 arranged side by side; an indication hole is provided on the housing 3 and is matched with the closing and opening indication portion 705; when the circuit breaker is in the closing state, the closing indication surface 7500 is opposite to the indication hole and can be observed; when the circuit breaker is in the tripping state, the tripping indication surface 7051 is opposite to the indication hole and can be observed.

[0054] Preferably, as Figure 2 、 3 、6, 8 shown, the contact support 6 is integrally in a U-shaped structure, including a connecting plate 63 and a first plate 61 and a second plate 62 respectively bent and connected to the connecting plate 63; the link support 7 includes a substrate 70 and a connecting arm 71. The substrate 70 is arranged outside the first plate 61 and is connected to it (located outside the first plate 61 and the second plate 62). One end of the connecting arm 71 is connected to the substrate 70, and the other end passes through the first plate 61 from above the first plate 61 and is connected to the second plate 62; one end of the moving contact member 1-10 is inserted between the first plate 61 and the second plate 62 and is elastically driven and connected to the contact support 6. Further, as Figure 7D shown, when the circuit breaker trips or opens, the contact spring 16 drives the moving contact member 1-10 to rotate, so that one end of the moving contact member 1-10 inserted between the first plate 61 and the second plate 62 is in limit fit with the connecting arm 71.

[0055] Preferably, as Figure 1A 、 1CAs shown in FIGS. 3, 6, 7A and 7B, the connecting rod support 7 further includes a locking shaft 706 and a jumping buckle shaft 707 provided on the substrate 70. The locking shaft 706 and the jumping buckle shaft 707 are provided on one side of the substrate 70, and the connecting arm 71 is provided on the other side of the substrate 70. The locking member 8 and the jumping buckle member 9 are respectively pivotally provided on the substrate 70 through the locking shaft 706 and the jumping buckle shaft 707.

[0056] Preferably, as Figure 7A shown, when the circuit breaker is tripped, the first displacement rotation angle α of the support assembly 6-7 around the second shaft 12 < the second displacement rotation angle β of the moving contact member 1-10 around the first shaft 11, so that when the moving contact member 1-10 of the circuit breaker of the present invention is disconnected from the static contact 2, a larger electrical clearance is obtained, which is beneficial to improving the insulation performance. Specifically, as Figure 7D shown, the distance between the limiting rib 1050 and the first shaft 11 is R0, and the distance between the limiting rib 1050 and the second shaft 12 is R1, and R0 < R1. Therefore, the first displacement rotation angle α of the support assembly 6-7 around the second shaft 12 < the second displacement rotation angle β of the moving contact member 1-10 around the first shaft 11.

[0057] Preferably, as Figure 1A shown, the operating mechanism further includes a support assembly return spring, and the circuit breaker further includes a short-circuit protection mechanism and an overload protection mechanism (not shown in the figure) that are respectively drivingly engaged with the jumping buckle member 9; when a short-circuit fault or an overload fault occurs, the short-circuit protection mechanism or the overload protection mechanism drives the jumping buckle member 9 to rotate, so that the jumping buckle member 9 releases the locking cooperation with the locking member 8, and the support assembly return spring drives the support assembly 6-7 to rotate. At the same time, the contact spring 16 drives the moving contact member 1-10 to reset, so that the moving contact member 1-10 is disconnected from the static contact 2.

[0058] Specifically, as Figure 1A 、 1C 、7A, 7B, 7C shown, one end of the jumping buckle 8 is pivotally provided on the connecting rod support 7 through the jumping buckle shaft 706, and the middle part of the locking buckle 9 is pivotally provided on the connecting rod support 7 through the locking buckle shaft 707. The other end of the jumping buckle 8, the first buckle tooth 81, is locked and connected to the first buckle platform 91 at one end of the locking buckle 9. The handle 4 is drivingly connected to the middle part of the jumping buckle 8 through the connecting rod 5; as Figure 1A 、 3 、6, 7A and 7B shown, the opening / closing indication portion 705 is provided at the upper end of the substrate 70, and an indication hole cooperating with the opening / closing indication portion 70 is provided on the upper side wall of the housing 3; as Figure 1A 、 7A, as shown in Figures 7B, 7D, and 7E, with the side facing the reader of each figure being the front side, the contact support 6, moving contact parts 1-10, link support 7, locking part 8, and tripping part 9 are all arranged between a pair of side walls of the housing 3. The upper ends of the moving contact parts 1-10 are inserted between the first plate 61 and the second plate 62 of the contact support 6 and are located on the left side of the connecting arm 71, and the lower ends are engaged with the static contact 2. The base plate 70 of the link support 7 is arranged on the front side of the first plate 61. The front end of the connecting arm 71 is connected to the base plate 70, and the rear end is connected to the second plate 62. Both the locking part 8 and the tripping part 9 are located on the front side of the base plate 70. Both ends of the link 5 are inserted into the handle 4 and the lock 8 respectively from the front side of the operating mechanism. As Figure 7A , 7B , as shown in Figures 7C and 7E, the working process of the operating mechanism of the circuit breaker of the present invention is as follows: As Figure 7A , 7B and as shown in Figure 7D, the circuit breaker is in the open state. The handle 4 is toggled to rotate clockwise. The handle 4 drives the support components 6-7, the locking part 8, and the tripping part 9 to rotate clockwise around the second axis 12 through the link 5. At the same time, the contact support 6 drives the moving contact parts 1-10 to rotate clockwise around the first axis 11 through the contact spring 16 until the lower ends of the moving contact parts 1-10 are initially in contact with the static contact 2. The handle 4 is continuously toggled to rotate clockwise, and the handle 4 then drives the support components 6-7 to continue to rotate around the second axis 12. Due to the limitation of the static contact 2 and the first axis 11, the moving contact parts 1-10 no longer continue to rotate, so the support components 6-7 move relative to the moving contact parts 1-10, and the contact spring 16 is compressed to provide contact pressure for the moving contact parts 1-10 and the static contact 2. The circuit breaker then enters Figure 7E the closed state shown; as Figure 7E shown, the circuit breaker is in the closed state. When a short circuit or overload fault occurs, the short-circuit protection mechanism or the overload protection mechanism drives the tripping part 9 to rotate counterclockwise, so that the tripping part 9 releases the locking cooperation with the locking part 8. The contact spring 16 causes the support components 6-7 to rotate relative to the moving contact parts 1-10, so that the limiting plane 702 of the connecting arm 71 of the link support 7 contacts and is limit-fitted with the limiting rib 1050 of the first bracket limiting part 105 of the contact support 10. The support component return spring then drives the support components 6-7 to rotate counterclockwise around the second axis 12. The support components 6-7 drive the moving contact parts 1-10 to rotate counterclockwise around the first axis 11, and the lower ends of the moving contact parts 1-10 are disconnected from the static contact 2; as Figure 7E shown, the circuit breaker is in the closed state. The handle 4 is toggled to rotate counterclockwise. The support components 6-7 lose the force balance state and are driven by the support component return spring to rotate counterclockwise. At the same time, the contact spring 16 drives the moving contact parts 1-10 to reset, so that the moving contact parts 1-10 are limit-fitted with the connecting arm 71 of the link support 7. The circuit breaker enters Figure 7A , 7B and the open state shown in Figure 7D; asFigure 7A As shown, when the circuit breaker trips or switches off, the support component 6-7 rotates counterclockwise around the second shaft 12. The angular displacement of the support component 6-7 is the first displacement rotation angle α, and the moving contact member 1-10 rotates counterclockwise around the first shaft 11. The angular displacement of the moving contact member 1-10 is the second displacement rotation angle β, and the first displacement rotation angle α < the second displacement rotation angle β.

[0059] Preferably, as Figure 7D 、 7E and 8 show, the contact spring 16 is a torsion spring. Two contact springs 16 are respectively arranged on both sides of the moving contact member 1-10 and are both sleeved on the first shaft 11. Both ends of each contact spring 16 are respectively connected to the contact support member 6 and the moving contact member 1-10. Further, as Figure 2 shown, the moving contact support member 6 further includes two spring limiting arms 602 which are respectively arranged on the first plate 61 and the second plate 62 and are oppositely arranged. The contact spring 16 is a torsion spring. Two contact springs are respectively arranged on both sides of the moving contact member 1-10 and are both sleeved on the first shaft 11. One end of each contact spring 16 is connected to the spring limiting arm 602, and the other end is connected to the moving contact member 1-10; the end of the moving contact member 1-10 inserted between the first plate 61 and the second plate 62 is located between the spring limiting arm 602 and the connecting arm 71. It should be noted that the contact spring 16 is not limited to a torsion spring and can also be a compression spring, and only the structure of the moving contact member 1-10 needs to be simply modified to achieve.

[0060] Preferably, as Figure 5 、 7D 、7E and 8 show, the moving contact member 1-10 includes a contact support 10 and a moving contact 1. One end of the moving contact 1 is inserted on the contact support 10, and the other end cooperates with the static contact 2. Further, as Figure 7D and 7E shown, the contact support 10 further includes a first support limiting part 105. The first support limiting part 105 is located at the edge of the contact support 10 opposite to the moving contact 1. The first support limiting part 105 is located between the spring limiting arm 602 of the contact support member 6 and the connecting arm 71 of the link support member 7. When the circuit breaker trips or switches off, the contact spring 16 drives the moving contact member 1 to rotate, so that the first support limiting part 105 is in limiting cooperation with the connecting arm 71. Specifically, as Figure 7D and 7E shown, the upper end of the moving contact 1 is inserted into the contact support 10, and the lower end cooperates with the static contact 2. The first support limiting part 105 is arranged at the upper end of the contact support 10. Further, as Figure 3 shown, one side of the connecting arm 71 is provided with a limiting plane 702. As Figure 4 shown, the first support limiting part 105 includes a limiting rib 1050. As Figure 7DAs shown, when the moving contact member 1-10 and the static contact 2 are in the open state, the limiting rib 1050 is in limiting cooperation with the limiting plane 702, as Figure 7E shown, when the moving contact member 1-10 and the static contact 2 are in the closed state, there is a gap between the limiting rib 1050 and the limiting plane 702.

[0061] Preferably, as Figure 2 、 3 、6 shown, the link support member 7 further includes a first connecting boss 703 and a second connecting boss 704 respectively arranged on the free ends of the substrate 70 and the connecting arm 71; the contact support member 6 further includes a first connecting hole 603 and a second connecting hole 604 respectively arranged on the first plate 61 and the second plate 62; the first connecting boss 703 and the second connecting boss 704 are respectively in plug-in fit with the first connecting hole 603 and the second connecting hole 604. It should be noted that the connection between the link support member 7 and the contact support member 6 is not limited to the above connection method, and the two can also be connected by a snap connection.

[0062] As Figure 2 shown, it is an embodiment of the contact support member 6.

[0063] As Figure 2 shown, the contact support member 6 is integrally in a U-shaped structure, which includes a connecting plate 63 and relatively arranged first plate 61 and second plate 62. Both the first plate 61 and the second plate 62 include connecting edges. One ends of the connecting edges of the first plate 61 and the second plate 62 are respectively connected to both ends of the connecting plate 63. The other ends of the connecting edges of the first plate 61 and the second plate 62 each have a spring limiting arm 602, and the two spring limiting arms 602 are relatively arranged. Both the first plate 61 and the second plate 62 are provided with a first kidney-shaped hole 601 for avoiding the first shaft 11 and a contact support member shaft hole 605 for cooperating with the second shaft 12. Each first kidney-shaped hole 601 is located between the spring limiting arm 602 and the connecting plate 63. The contact support member shaft hole 605 is arranged on one side of the first kidney-shaped hole 601, and the contact support member shaft hole 605 is close to the connecting plate 63. One end of the first plate 61 away from the spring limiting arm 602 and the connecting plate 63 is provided with a first connecting hole 603, and the second plate 62 is further provided with a second connecting hole 604, and the second connecting hole 604 is close to the spring limiting arm 602.

[0064] Specifically, as Figure 2 shown in the direction, with Figure 2The side facing the reader is the front side. The front ends of the first plate 61 and the second plate 62 are their respective connecting edges. The right ends of the connecting edges of the first plate 61 and the second plate 62 are bent and connected to the upper and lower ends of the connecting plate 63 respectively. Each of the left ends of the connecting edges of the first plate 61 and the second plate 62 is provided with a spring limiting arm 602, and the two spring limiting arms 602 are arranged oppositely. Each of the middle parts of the first plate 61 and the second plate 62 is provided with a first waist-shaped hole 601 and a contact support member shaft hole 605. The contact support member shaft hole 605 is located on the right side of the first waist-shaped hole 601. The rear end of the first plate 61 is provided with a first connection hole 603, and the right end of the second plate 62 is provided with a second connection hole 604.

[0065] As Figure 3 shown, it is an embodiment of the link support member 7.

[0066] As Figure 3 shown, the link support member 7 includes a base plate 70 and a connecting arm 71. One end of the connecting arm 71 is vertically connected to one side of the base plate 70. The other end of the connecting arm 71 is provided with a second connecting boss 704. One side of the connecting arm 71 is provided with a limiting plane 702 that is in limiting cooperation with the limiting rib 1050 of the moving contact member 1-10. The other side of the base plate 70 is provided with a locking shaft 706 and a jumping shaft 707. The base plate 70 is further provided with a second waist-shaped hole 701 for avoiding the first shaft 11 and a link support member shaft hole 708 for cooperating with the second shaft 12. The connecting arm 71 and the link support member shaft hole 708 are respectively located at both ends of the base plate 70. The second waist-shaped hole 701 is located between the connecting arm 71 and the link support member shaft hole 708. The locking shaft 706 and the jumping shaft 707 are located on one side of the second waist-shaped hole 701 and the link support member shaft hole 708. At the edge of the base plate 70 close to the connecting arm 71, a closing and opening indication part 705 is further provided. The closing and opening indication part 705 includes a closing indication surface 7500 and an opening indication surface 7051 arranged side by side.

[0067] [[ID=I3]]Specifically, as Figure 3 shown, the right end of the connecting arm 71 is vertically connected to the upper left side of the base plate 70. The left end of the connecting arm 71 is provided with a second connecting boss 704. The front side of the connecting arm 71 is the limiting plane 702. The right side of the base plate 70 is provided with a locking shaft 706 and a jumping shaft 707. The base plate 70 is further provided with a second waist-shaped hole 701 and a link support member shaft hole 708. The closing and opening support part 705 is arranged on the upper end of the base plate 70. The jumping shaft 707 and the link support member shaft hole 708 are arranged at two end corners of the lower end of the base plate 70. The first waist-shaped hole 701 is arranged above the link support member shaft hole 708. The locking shaft 706 is arranged above the jumping shaft 707.

[0068] As Figure 4 and 5 shown, it is an embodiment of the moving contact member 1-10.

[0069] AsFigure 5 As shown, the moving contact member 1-10 includes a contact support 10 and a moving contact 1. One end of the moving contact 1 is inserted into the contact support 10, and the other end cooperates with the static contact 2. The contact support 10 includes a contact slot 104 and a moving contact shaft hole 101. The contact slot 104 is provided in the middle of the contact support 10, and the moving contact shaft hole 101 penetrates the contact support 10 in the thickness direction of the contact support 10. The moving contact 1 includes a moving contact limit groove 101a provided on one of its side edges. One end of the moving contact 1 is inserted into the contact slot 104, and the first shaft 11 passes through the moving contact shaft hole 101 and is in limit cooperation with the moving contact shaft hole 101 to prevent the moving contact 1 from being disengaged from the contact slot 104. Further, as Figure 4 shown, the contact support 10 further includes a first support limit portion 105. The first support limit portion 105 is located at the edge of the contact support 10 opposite to the moving contact 1. The first support limit portion 105 is located between the spring limit arm 602 of the contact support member 6 and the connecting arm 71 of the link support member 7. When the circuit breaker trips or opens, the contact spring 16 drives the moving contact member 1-10 to rotate, so that the first support limit portion 105 is in limit cooperation with the connecting arm 71. Further, as Figure 4 shown, a limit rib 1050 is provided on one side of the first support limit portion 105 for limit cooperation with the limit plane 702 of the link support member 7. Further, as Figure 4 shown, the contact support 10 further includes two second support limit portions 106 provided on both sides thereof respectively. The distance between the free ends of the two second support limit portions 106 matches the distance between the first plate 61 and the second plate 62 of the contact support member 6, so that the moving contact member 1-10 can rotate stably and smoothly between the first plate 61 and the second plate 62, but will not move axially along the first shaft 11, ensuring the reliable cooperation between the moving contact member 1-10 and the static contact 2. Further, as Figure 4 shown, the contact support 10 further includes two spring limit blocks 103 provided on both sides thereof respectively. The two ends of each contact spring 16 are respectively connected to the spring limit arm 602 of the contact support member 6 and the spring limit block 103.

[0070] Specifically, as Figure 4 shown in the direction, the contact slot 104 is provided in the middle of the contact support 10 and opens downward. The moving contact shaft hole 101 is provided in the middle of the contact support 10 and penetrates the contact support 10 in the width direction of the contact support 10. The first support limit portion 105 is provided at the top of the contact support 10. The second support limit portions 106 are provided between the first support limit portion 105 and the moving contact shaft hole 101. The two spring limit blocks 103 are provided on both sides of the right end of the contact support 10. The limit rib 1050 is provided on the right side of the first support limit portion 1050.

[0071] Preferably, the second bracket limiting portion 106 is an arc-shaped rib centered on the moving contact shaft hole 101; a ring-shaped boss 1010 is provided at each end of the moving contact shaft hole 101, and the contact spring 16 is sleeved on the ring-shaped boss 1010.

[0072] Preferably, as shown in FIG. 1, a mounting boss 30 is provided on each of a pair of side walls of the housing 3, and a first shaft mounting hole 301 and a second shaft mounting hole 302 are provided on each mounting boss 30. Both ends of the first shaft 11 are respectively arranged in the two first shaft mounting holes 301, and both ends of the second shaft 12 are respectively arranged in the two second shaft mounting holes 302.

[0073] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (3) and an operating mechanism, a moving contact piece (1-10) and a stationary contact (2) arranged in the housing (3), wherein the operating mechanism is connected to the moving contact piece (1-10) by driving to close / open the moving contact piece (1-10) and the stationary contact (2); Its characteristics are: The operating mechanism comprises a handle (4), a connecting rod (5), a contact spring (16), a support assembly (6-7), a locking member (8) and a jumper (9) pivotally arranged on the housing (3); the handle (4) is connected to the support assembly (6-7) by driving via the connecting rod (5); the support assembly (6-7) and the movable contact member (1-10) are pivotally arranged on the housing (3) via the second shaft (12) and the first shaft (11) respectively; the support assembly (6-7) comprises a fixedly connected contact support member (6) and a connecting rod support member (7); the contact support member (6) is elastically connected to the movable contact member (1-10) by driving via the contact spring (16); the locking member (8) and the jumper (9) are locked and matched and pivotally arranged on the connecting rod support member (7) respectively; the handle (4) is connected to the locking member (8) via the connecting rod (5).

2. The circuit breaker according to claim 1, wherein: The support assembly (6-7) further includes an avoidance structure for avoiding the first shaft (11), the avoidance structure including a first waist-shaped hole (601) and a second waist-shaped hole (701) respectively arranged on the contact support member (6) and the connecting rod support member (7), the first waist-shaped hole (601) and the second waist-shaped hole (701) being correspondingly arranged for the first shaft (11) to pass through.

3. The circuit breaker according to claim 1 or 2, characterized in that: The handle (4) rotates, driving the support assembly (6-7) to rotate around the second axis (12) through the connecting rod (5), and at the same time, the contact support member (6) drives the movable contact member (1-10) to rotate around the first axis (11) through the contact spring (16) until the movable contact member (1-10) and the static contact (2) are initially contacted. The handle (4) continues to rotate and drives the support assembly (6-7) to continue to rotate around the second axis (12) through the connecting rod (5), the support assembly (6-7) moves relative to the movable contact member (1-10), the contact spring (16) is compressed, and the circuit breaker enters a closed state.

4. The circuit breaker according to claim 1 or 2, characterized in that: The contact support member (6) is a U-shaped structure as a whole, including a connecting plate (63) and a first plate (61) and a second plate (62) respectively connected to the connecting plate (63) and arranged opposite to each other; the connecting rod support member (7) includes a base plate (70) and a connecting arm (71), the base plate (70) is arranged on the outside of the first plate (61) and connected to the first plate (61), one end of the connecting arm (71) is connected to the base plate (70), and the other end is connected to the second plate (62); one end of the movable contact member (1-10) is inserted between the first plate (61) and the second plate (62) and the end is elastically driven and connected to the contact support member (6).

5. The circuit breaker according to claim 1, wherein: The contact support member (6) is formed by bending and stamping a metal plate; the connecting rod support member (7) is an injection molded part.

6. The circuit breaker according to claim 4, wherein: The connecting rod support member (7) further comprises a locking shaft (706) and a jumper shaft (707) arranged on the base plate (70); the locking shaft (706) and the jumper shaft (707) are arranged on one side of the base plate (70); the connecting arm (71) is arranged on the other side of the base plate (70); the locking member (8) and the jumper member (9) are respectively pivotally arranged on the base plate (70) via the locking shaft (706) and the jumper shaft (707).

7. The circuit breaker according to claim 4, wherein: The connecting rod support member (7) further comprises a first connecting boss (703) and a second connecting boss (704) respectively arranged on the base plate (70) and the free end of the connecting arm (71); the contact support member (6) further comprises a first connecting hole (603) and a second connecting hole (604) respectively arranged on the first plate (61) and the second plate (62); the first connecting boss (703) and the second connecting boss (704) are respectively plugged into and fitted with the first connecting hole (603) and the second connecting hole (604).

8. The circuit breaker according to claim 4, wherein: The contact spring (16) is a torsion spring. The two contact springs (16) are respectively arranged on both sides of the movable contact member (1-10) and are both sleeved on the first shaft (11). Both ends of each contact spring (16) are respectively connected to the contact support member (6) and the movable contact member (1-10).

9. The circuit breaker according to claim 4, characterized in that: When the circuit breaker trips or opens, the contact spring (16) drives the movable contact member (1-10) to rotate, so that one end of the movable contact member (1-10) inserted between the first plate (61) and the second plate (62) is limitedly matched with the connecting arm (71).

10. The circuit breaker according to claim 9, wherein: The contact support member (6) further comprises two spring limiting arms (602) respectively arranged on the first plate (61) and the second plate (62) and arranged opposite to each other; the contact spring (16) is a torsion spring; the two contact springs (16) are respectively arranged on both sides of the movable contact member (1-10) and are both sleeved on the first shaft (11); one end of each contact spring (16) is connected to the spring limiting arm (602), and the other end is connected to the movable contact member (1-10); one end of the movable contact member (1-10) inserted between the first plate (61) and the second plate (62) is located between the spring limiting arm (602) and the connecting arm (71).

11. The circuit breaker according to claim 4, wherein: One end of the substrate (70) is provided with an opening / closing indicator portion (705), and the opening / closing indicator portion (705) comprises a closing indicator surface (7500) and an opening indicator surface (7051) arranged side by side; the housing (3) is provided with an indicator hole that cooperates with the opening / closing indicator portion (705); when the circuit breaker is in a closed state, the closing indicator surface (7500) and the indicator hole are observed relative to each other, and when the circuit breaker is in an open state, the opening indicator surface (7051) and the indicator hole are observed relative to each other.

12. The circuit breaker according to claim 1, wherein: The contact support member (6) is a U-shaped structure as a whole, comprising a connecting plate (63) and a first plate (61) and a second plate (62) arranged opposite to each other. The first plate (61) and the second plate (62) both comprise connecting edges. One end of the connecting edge of the first plate (61) and the second plate (62) is respectively connected to the two ends of the connecting plate (63). The other end of the connecting edge of the first plate (61) and the second plate (62) is respectively provided with a spring limiting arm (602). The two spring limiting arms (602) are arranged opposite to each other. The first plate (61) and the second plate (62) are both provided with a first waist-shaped hole (602) for avoiding the first shaft (11). 01) and a contact support shaft hole (605) matched with the second shaft (12), each first waist-shaped hole (601) is located between the spring limiting arm (602) and the connecting plate (63), the contact support shaft hole (605) is arranged on one side of the first waist-shaped hole (601), the contact support shaft hole (605) is arranged close to the connecting plate (63), the first plate (61) is further provided with a first connecting hole (603) at one end away from the spring limiting arm (602) and the connecting plate (63), and the second plate (62) is further provided with a second connecting hole (604), and the second connecting hole (604) is arranged close to the spring limiting arm (602).

13. The circuit breaker according to claim 1, wherein: The connecting rod support member (7) comprises a base plate (70) and a connecting arm (71), one end of the connecting arm (71) is vertically connected to one side of the base plate (70), the other end of the connecting arm (71) is provided with a second connecting boss (704), one side of the connecting arm (71) is provided with a limiting plane (702) that matches the movable contact member (1-10), the other side of the base plate (70) is provided with a locking shaft (706) and a jump buckle shaft (707), and the base plate (70) is also provided with a second waist-shaped hole (701) for avoiding the first shaft (11) and a connecting rod support member shaft hole (707) that matches the second shaft (12). 8), the connecting arm (71) and the connecting rod support shaft hole (708) are respectively located at two ends of the base plate (70), the second waist-shaped hole (701) is located between the connecting arm (71) and the connecting rod support shaft hole (708), the locking shaft (706) and the tripping shaft (707) are located on one side of the second waist-shaped hole (701) and the connecting rod support shaft hole (708), and the edge of the base plate (70) near the connecting arm (71) is also provided with a switch opening and closing indicator (705), and the switch opening and closing indicator (705) includes a switch closing indicator surface (7500) and a switch opening indicator surface (7051) arranged side by side.

14. The circuit breaker according to claim 1 or 2, characterized in that: The movable contact member (1-10) comprises a contact support (10) and a movable contact (1), one end of the movable contact (1) is inserted into the contact support (10), and the other end is matched with the static contact (2); the contact support (10) comprises a contact slot (104) and a movable contact shaft hole (101), the contact slot (104) is arranged in the middle of the contact support (10), and the movable contact shaft hole (101) penetrates the contact support (10) in the thickness direction. 10); the moving contact (1) includes a moving contact limiting groove (101a) provided on one side edge thereof, one end of the moving contact (1) is inserted into the contact slot (104), the first shaft (11) passes through the moving contact shaft hole (101) and is limitedly engaged with the moving contact limiting groove (101a) to prevent the moving contact (1) from falling out of the contact slot (104); the contact support (6) is elastically driven and connected to the contact bracket (10) through a contact spring (16).

15. The circuit breaker according to claim 14, wherein: The contact support (10) further comprises a first support limiting portion (105), the first support limiting portion (105) being located at an edge of the contact support (10) opposite to the moving contact (1), the first support limiting portion (105) being located between a spring limiting arm (602) of the contact support member (6) and a connecting arm (71) of the connecting rod support member (7), and when the circuit breaker trips or opens, the contact spring (16) drives the moving contact member (1-10) to rotate, so that the first support limiting portion (105) and the connecting arm (71) are limited and matched.

16. The circuit breaker according to claim 15, wherein: The contact bracket (10) further includes two second bracket limiting portions (106) respectively arranged on both sides thereof, and the spacing between the free ends of the two second bracket limiting portions (106) matches the spacing between the first plate (61) and the second plate (62) of the contact support (6); and a limiting rib (1050) is provided on one side of the first bracket limiting portion (105) for limiting the positioning of the limiting plane (702) of the connecting arm (71).

17. The circuit breaker according to claim 1 or 16, characterized in that: When the circuit breaker trips or opens, a first displacement angle α of the support assembly (6-7) around the second axis (12) is less than a second displacement angle β of the moving contact piece (1-10) around the first axis (11).

18. The circuit breaker according to claim 1, wherein: A mounting boss (30) is provided on each of a pair of side walls of the housing (3), and each mounting boss (30) is provided with a first shaft mounting hole (301) and a second shaft mounting hole (302). The two ends of the first shaft (11) are respectively arranged in the two first shaft mounting holes (301), and the two ends of the second shaft (12) are respectively arranged in the two second shaft mounting holes (302).

19. The circuit breaker according to claim 1, wherein: The operating mechanism further includes a support assembly reset spring, and the circuit breaker further includes a short circuit protection mechanism and an overload protection mechanism respectively driven and matched with the tripping member (9); when a short circuit or overload fault occurs, the short circuit protection mechanism or the overload protection mechanism drives the tripping member (9) to rotate, so that the tripping member (9) releases the locking match with the locking member (8), and the support assembly reset spring drives the support assembly (6-7) to rotate, and at the same time the contact spring (16) drives the movable contact member (1-10) to reset, so that the movable contact member (1-10) is disconnected from the static contact (2).

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