CN113130271A

CN113130271A - Circuit breaker

Info

Publication number: CN113130271A
Application number: CN202010030717.6A
Authority: CN
Inventors: 陈在伟; 葛伟骏
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2021-07-16

Abstract

The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker, which comprises a shell, an operating mechanism, a movable contact piece and a static contact, wherein the operating mechanism, the movable contact piece and the static contact are arranged in the shell; the operating mechanism comprises a handle, a connecting rod, a contact spring, a supporting component, a locking piece and a tripping piece, wherein the handle, the connecting rod, the contact spring, the supporting component, the locking piece and the tripping piece are pivotally arranged on the shell; the handle is in driving connection with the supporting component through the connecting rod, and the supporting component and the movable contact piece are respectively arranged on the shell in a pivoting mode through the second shaft and the first shaft; the supporting assembly comprises a contact supporting piece and a connecting rod supporting piece which are fixedly connected, the contact supporting piece is elastically driven and connected with the moving contact piece through a contact spring, the locking piece and the tripping piece are in locking fit and are respectively arranged on the connecting rod supporting piece in a pivoting mode, and the handle is connected with the locking piece through a connecting rod; the circuit breaker is convenient to produce and high in accuracy.

Description

Circuit breaker

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker.

Background

The existing circuit breaker has limited built-in space of a contact support piece, and the internal structure is optimized to improve the insufficient space; the contact spring is installed on one side, the output torque is large, and the force requirement is large during assembly; the output torque is large, the processing and manufacturing errors are easy to increase, and the starting pressure and the static contact pressure are inconsistent; and the existing movable contact arm adopts an injection molding insert process, and a movable gap exists between the movable contact and the movable contact reserved and installed on an injection mold, so that the deviation between the contact support and a working mandrel of the movable contact is caused, and the production loss is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a circuit breaker which is convenient to produce and has higher accuracy.

In order to achieve the purpose, the invention adopts the following technical scheme:

a circuit breaker comprises a shell 3, an operating mechanism, movable contact pieces 1-10 and a static contact 2, wherein the operating mechanism, the movable contact pieces 1-10 and the static contact 2 are arranged in the shell 3, the operating mechanism is connected with the movable contact pieces 1-10 in a driving mode, and the movable contact pieces 1-10 are driven to be closed/opened with the static contact 2;

the operating mechanism comprises a handle 4, a connecting rod 5, a contact spring 16, supporting components 6-7, a locking piece 8 and a tripping piece 9 which are pivotally arranged on the shell 3; the handle 4 is in driving connection with the supporting components 6-7 through the connecting rod 5, and the supporting components 6-7 and the movable contact pieces 1-10 are respectively arranged on the shell 3 in a pivoting way through a second shaft 12 and a first shaft 11; the supporting component 6-7 comprises a contact supporting piece 6 and a connecting rod supporting piece 7 which are fixedly connected, the contact supporting piece 6 is elastically and drivingly connected with the movable contact pieces 1-10 through a contact spring 16, a locking piece 8 and a tripping piece 9 are in locking fit and are respectively and pivotally arranged on the connecting rod supporting piece 7, and the handle 4 is connected with the locking piece 8 through a connecting rod 5.

Preferably, the support assembly 6-7 further includes an avoiding structure for avoiding the first shaft 11, the avoiding structure includes a first waist-shaped hole 601 and a second waist-shaped hole 701 respectively disposed on the contact support member 6 and the link support member 7, and the first waist-shaped hole 601 and the second waist-shaped hole 701 are correspondingly disposed for the first shaft 11 to pass through.

Preferably, the handle 4 rotates to drive the support assembly 6-7 to rotate around the second shaft 12 through the connecting rod 5, meanwhile, the contact support member 6 drives the movable contact piece 1-10 to rotate around the first shaft 11 through the contact spring 16 until the movable contact piece 1-10 is initially contacted with the fixed contact 2, the handle 4 continues to rotate and drives the support assembly 6-7 to continue to rotate around the second shaft 12 through the connecting rod 5, the support assembly 6-7 moves relative to the movable contact piece 1-10, the contact spring 16 is compressed, and the circuit breaker enters a closing state.

Preferably, the contact support member 6 is integrally formed into a U-shaped structure, and includes a connecting plate 63, and a first plate 61 and a second plate 62 which are respectively connected to the connecting plate 63 in a bent manner and are oppositely disposed; the connecting rod supporting part 7 comprises a base plate 70 and a connecting arm 71, the base plate 70 is arranged on the outer side of the first plate 61 and is connected with the first plate 61, one end of the connecting arm 71 is connected with the base plate 70, and the other end of the connecting arm 71 is connected with the second plate 62; one end of the movable contact piece 1-10 is interposed between the first plate 61 and the second plate 62 and the end is elastically and drivingly connected to the contact support 6.

Preferably, the contact support 6 is formed by bending and stamping a metal plate; the connecting rod supporting piece 7 is an injection molding piece.

Preferably, the link support 7 further includes a latch shaft 706 and a trip shaft 707 disposed on the base plate 70, the latch shaft 706 and the trip shaft 707 are disposed on one side of the base plate 70, the connecting arm 71 is disposed on the other side of the base plate 70, and the latch 8 and the trip 9 are respectively pivotally disposed on the base plate 70 through the latch shaft 706 and the trip shaft 707.

Preferably, the link support 7 further includes a first coupling boss 703 and a second coupling boss 704 respectively provided on the free ends of the base plate 70 and the connecting arm 71; the contact support 6 further comprises a first connection hole 603 and a second connection hole 604 provided on the first plate 61 and the second plate 62, respectively; the first connection boss 703 and the second connection boss 704 are respectively inserted into and matched with the first connection hole 603 and the second connection hole 604.

Preferably, the contact spring 16 is a torsion spring, two contact springs 16 are respectively arranged at two sides of the movable contact piece 1-10 and are sleeved on the first shaft 11, and two ends of each contact spring 16 are respectively connected with the contact support piece 6 and the movable contact piece 1-10.

Preferably, when the circuit breaker is tripped or opened, the contact spring 16 drives the movable contact pieces 1-10 to rotate, so that one ends of the movable contact pieces 1-10, which are inserted between the first plate 61 and the second plate 62, are in limit fit with the connecting arm 71.

Preferably, the contact support member 6 further comprises 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, the two contact springs 16 are respectively arranged on two 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 with the spring limiting arm 602, and the other end is connected with the movable contact member 1-10; one end of the movable contact pieces 1 to 10 interposed between the first plate 61 and the second plate 62 is located between the spring stopper arm 602 and the connecting arm 71.

Preferably, one end of the substrate 70 is provided with a switching-on/off indication part 705, and the switching-on/off indication part 705 comprises a switching-on indication surface 7500 and a switching-off indication surface 7051 which are arranged in parallel; an indicating hole matched with the opening and closing indicating part 705 is formed in the shell 3; when the circuit breaker is in a closing state, the closing indicating surface 7500 and the indicating hole are observed relatively, and when the circuit breaker is in an opening state, the opening indicating surface 7051 and the indicating hole are observed relatively.

Preferably, the contact support member 6 is integrally formed into a U-shaped structure, and includes a connecting plate 63 and a first plate 61 and a second plate 62 which are oppositely arranged, each of the first plate 61 and the second plate 62 includes a connecting edge, one end of the connecting edge of the first plate 61 and the second plate 62 is respectively connected with 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 oppositely arranged, each of the first plate 61 and the second plate 62 is provided with a first waist-shaped hole 601 for avoiding the first shaft 11 and a contact support member shaft hole 605 for matching 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 member shaft hole 605 is arranged at one side of the first waist-shaped hole 601, the contact support member shaft hole 605 is arranged close to the connecting plate 63, one end of the first plate 61, which is far away from the spring limiting arm 602 and the connecting plate, the second connecting plate 62 is further provided with a second connecting hole 604, and the second connecting hole 604 is disposed near the spring limiting arm 602.

Preferably, the link support 7 includes a base plate 70 and a connecting arm 71, one end of the connecting arm 71 is vertically connected with 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 limit plane 702 in limit fit with the movable contact piece 1-10, the other side of the base plate 70 is provided with a latch shaft 706 and a trip 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 shaft hole 705 in fit with the second shaft 12, the connecting arm 71 and the link support shaft hole 705 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 link support shaft hole 705, the latch shaft 706 and the trip shaft 707 are located at one side of the second waist-shaped hole 701 and the link support shaft 705, an opening and closing indication portion 705 is further located at an edge of the base plate 70 close to the connecting arm 71.

Preferably, the moving contact pieces 1-10 comprise 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 of the moving contact is matched with the static contact 2; the contact support 10 comprises a contact slot 104 and a moving contact shaft hole 101, the contact slot 104 is arranged in the middle of the contact support 10, and the moving contact shaft hole 101 penetrates through the contact support 10 in the thickness direction of the contact support 10; the moving contact 1 comprises a moving contact limiting groove 101a arranged on one side edge of the moving contact 1, one end of the moving contact 1 is inserted into the contact slot 104, and the first shaft 11 penetrates through the moving contact shaft hole 101 and is in limiting fit 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 in spring-driven connection with the contact carrier 10 via a contact spring 16.

Preferably, the contact support 10 further includes a first support limiting portion 105, the first support limiting portion 105 is located at an edge of the contact support 10 opposite to the movable 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 link support 7, and when the circuit breaker trips or is opened, the contact spring 16 drives the movable contact 1-10 to rotate, so that the first support limiting portion 105 is in limiting fit with the connecting arm 71.

Preferably, the contact carrier 10 further includes two second carrier-limiting portions 106 respectively disposed at both sides thereof, and a distance between free ends of the two second carrier-limiting portions 106 matches a distance between the first plate 61 and the second plate 62 of the contact support 6; one side of the first bracket limiting part 105 is provided with a limiting convex rib 1050 which is in limiting fit with the limiting plane 702 of the connecting arm 71.

Preferably, when the circuit breaker is tripped or opened, the supporting assembly 6-7 has a first displacement rotation angle alpha around the second shaft 12 < a second displacement rotation angle beta around the first shaft 11 of the movable contact piece 1-10.

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

Preferably, the operating mechanism further comprises a support assembly return spring, and the circuit breaker further comprises a short-circuit protection mechanism and an overload protection mechanism which are respectively in driving fit with the trip buckle 9; when a short circuit or overload fault occurs, the short circuit protection mechanism or the overload protection mechanism drives the jump buckle 9 to rotate, so that the jump buckle 9 is disengaged from the lock catch 8, the support component reset spring drives the support components 6-7 to rotate, and meanwhile, the contact spring 16 drives the movable contact pieces 1-10 to reset, so that the movable contact pieces 1-10 are disconnected from the static contact 2.

According to the operating mechanism of the circuit breaker, the supporting components 6-7 are divided into the contact supporting piece 6 and the connecting rod supporting piece 7, so that the structural complexity of a single part is reduced, the production difficulty is reduced, the manufacturing precision of the part is easier to control, and the part loss is effectively reduced. In addition, the contact support piece 6 is manufactured through a metal plate process, the connecting rod support piece is manufactured through an injection molding process, the thickness of the contact support piece 6 is obviously reduced, the occupied space is small, and after the contact support piece 6 is assembled with the connecting rod support piece 7, the residual space can be used for optimizing and improving internal parts.

Furthermore, the circuit breaker of the invention is provided with the contact springs 16 on both sides of the movable contact piece 1-10, so that the condition that the contact springs are installed on one side of the movable contact piece 1-10 to cause large output torque of the contact springs and easily generate processing and manufacturing errors is avoided. Furthermore, the contact support 10 is manufactured by injection molding alone, and in that the moving contact 1 is assembled and combined, the manufacturing precision of parts is controlled, the loss of the parts is reduced, when the moving contact 1 is used for a long time and the loss of the contact point needs to be changed, only the moving contact 1 needs to be changed, the contact support 10 can be continuously used, or the contact support 10 is deformed due to long-time use and cannot be used, only the contact support 10 needs to be changed, and the moving contact 1 can be continuously used.

Drawings

Figure 1A is an exploded view of the operating mechanism of the circuit breaker of the present invention;

FIG. 1B is an enlarged schematic view of portion A of FIG. 1A according to the present invention;

FIG. 1C is an enlarged schematic view of portion B of FIG. 1A according to the present invention;

fig. 2 is a schematic structural view of the contact support 6 of the present invention;

FIG. 3 is a schematic view of the construction of the link support 7 of the present invention;

fig. 4 is a schematic structural view of the contact mount 10 of the present invention;

fig. 5 is a schematic view of the assembly process of the contact support 10 and the movable contact 1 according to the present invention;

fig. 6 is a schematic view of an assembly structure of the moving contact 1, the contact support 10, the contact support 6 and the link support 7 according to the present invention;

fig. 7A is a schematic structural diagram of an operating mechanism of the circuit breaker according to the present invention, which shows at least a first displacement rotation angle α of the movable contact 1 around the first axis 11 and a second displacement rotation angle β of the contact support 6 around the second axis 12 when the circuit breaker is opened by closing;

fig. 7B is a schematic structural diagram of an operating mechanism of the circuit breaker of the present invention, when the circuit breaker is in an open state;

FIG. 7C is an enlarged schematic view of portion C of FIG. 7B in accordance with the present invention;

fig. 7D is a schematic structural view of the operating mechanism of the circuit breaker of the present invention, showing at least the mating relationship of the contact carrier 10 and the link support 7 when the circuit breaker is in the open state;

fig. 7E is a schematic structural diagram of an operating mechanism of the circuit breaker of the present invention, wherein the circuit breaker is in a closed state;

fig. 8 is a schematic view showing a projection structure of an operating mechanism of the circuit breaker of the present invention.

Detailed Description

The following description of the embodiments of the circuit breaker according to the present invention will be made with reference to the embodiments shown in fig. 1A to 8. The circuit breaker of the present invention is not limited to the description of the following embodiments.

The circuit breaker comprises a shell 3, an operating mechanism, movable contact pieces 1-10 and a static contact 2, wherein the operating mechanism, the movable contact pieces 1-10 and the static contact 2 are arranged in the shell 3;

According to the operating mechanism of the circuit breaker, the supporting components 6-7 are divided into the contact supporting piece 6 and the connecting rod supporting piece 7, so that the structural complexity of a single part is reduced, the production difficulty is reduced, the manufacturing precision of the part is easier to control, and the part loss is effectively reduced.

It should be noted that the phrase "the contact spring 16 is elastically urged to be connected to the movable contact member 1-10 by the contact support member 6" means that the contact support member 6 is elastically urged to be connected to the movable contact member 1-10 by the contact spring 16, and the contact support member 6 urges the movable contact member 1-10 to be operated by the contact spring 16.

Preferably, as shown in fig. 2, 3, 6, 7A and 7B, the support assembly 6-7 further includes an avoiding structure for avoiding the first shaft 11, the avoiding structure includes a first waist-shaped hole 601 and a second waist-shaped hole 701 respectively disposed on the contact support member 6 and the link support member 7, and the first waist-shaped hole 601 and the second waist-shaped hole 701 are correspondingly disposed for the first shaft 11 to pass through.

Preferably, as shown in fig. 7B and 7E, the handle 4 rotates to drive the support assembly 6-7 to rotate around the second shaft 12 through the connecting rod 5, and the contact support member 6 drives the movable contact member 1-10 to rotate around the first shaft 11 through the contact spring 16 until the movable contact member 1-10 is initially contacted with the fixed contact 2, the handle 4 continues to rotate and the support assembly 6-7 continues to rotate around the second shaft 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 closing state. It should be noted that the expression "until the movable contact piece 1-10 comes into initial contact with the stationary contact 2" refers to the moment when the movable contact piece 1-10 and the stationary contact 2 come into contact.

Preferably, as shown in fig. 2, 3 and 6, the contact support 6 is integrally formed into a U-shaped structure, and includes a connecting plate 63, and a first plate 61 and a second plate 62 which are respectively connected to the connecting plate 63 in a bending manner and are disposed opposite to each other, the link support 7 includes a base plate 70 and a connecting arm 71, the base plate 70 is disposed on one side of the first plate 61 and connected thereto, 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 piece 1-10 is interposed between the first plate 61 and the second plate 62 and the end is elastically and drivingly connected to the contact support 6. Further, as shown in fig. 2, 3 and 6, the contact support 6 is formed by bending and stamping a metal plate; the connecting rod support 7 is an injection molded part. The contact support piece 6 and the connecting rod support piece 7 are manufactured separately, the contact support piece 6 is manufactured through a metal plate process, the connecting rod support piece is manufactured through an injection molding process, the thickness of the contact support piece 6 is obviously reduced, the occupied space is small, and after the contact support piece 6 and the connecting rod support piece 7 are assembled, the residual space can be used for optimizing and improving internal parts.

Preferably, as shown in fig. 6 and 8, the contact spring 16 is a torsion spring, two contact springs 16 are respectively disposed on two sides of the movable contact member 1-10 and are both sleeved on the first shaft 11, and both ends of each contact spring 16 are respectively connected with the contact support member 6 and the movable contact member 1-10. The operating mechanism of the invention is provided with the contact springs 16 on both sides of the movable contact piece 1-10 respectively, thereby avoiding the situation that the contact springs are arranged on one side of the movable contact piece 1-10, which causes large output torque of the contact springs and is easy to generate processing and manufacturing errors.

Preferably, as shown in fig. 5, 6, 7D and 7E, the movable contact pieces 1-10 include 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 fixed contact 2; the contact support 10 comprises a contact slot 104 and a moving contact shaft hole 101, the contact slot 104 is arranged in the middle of the contact support 10, and the moving contact shaft hole 101 penetrates through the contact support 10 in the thickness direction of the contact support 10; the moving contact 1 comprises a moving contact limiting groove 101a arranged on one side edge of the moving contact 1, one end of the moving contact 1 is inserted into the contact slot 104, and the first shaft 11 penetrates through the moving contact shaft hole 101 and is in limiting fit 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 in spring-driven connection with the contact carrier 10 via a contact spring 16. The contact support 10 is manufactured by injection molding alone, and the moving contact 1 is assembled and combined, so that the manufacturing precision of parts is controlled, the loss of the parts is reduced, when the moving contact 1 is used for a long time and the contact loss needs to be replaced, only the moving contact 1 needs to be replaced, the contact support 10 can be continuously used, or the contact support 10 is deformed due to long-time use and cannot be used, only the contact support 10 needs to be replaced, and the moving contact 1 can be continuously used.

As shown in fig. 1A-8, an embodiment of the operating mechanism of the circuit breaker of the present invention is shown.

As shown in fig. 1A and 7A-7E, the operating mechanism of the circuit breaker of the present invention includes a housing 3, and an operating mechanism, a movable contact member 1-10 and a stationary contact 2 disposed in the housing 3, wherein the operating mechanism is drivingly connected to the movable contact member 1-10, and drives the movable contact member 1-10 to close/open with respect to the stationary contact 2. As shown in fig. 1A, 6 and 8, the operating mechanism includes a handle 4 pivotally provided on the housing 3, a link 5, a contact spring 16, a support assembly 6-7, a catch member 8 and a jumper member 9; the handle 4 is in driving connection with the supporting components 6-7 through the connecting rod 5, and the supporting components 6-7 and the movable contact pieces 1-10 are respectively arranged on the shell 3 in a pivoting way through a second shaft 12 and a first shaft 11; the supporting component 6-7 comprises a contact supporting piece 6 and a connecting rod supporting piece 7 which are fixedly connected, the contact supporting piece 6 is elastically and drivingly connected with the movable contact pieces 1-10 through a contact spring 16, a locking piece 8 and a tripping piece 9 are in locking fit and are respectively and pivotally arranged on the connecting rod supporting piece 7, and the handle 4 is connected with the locking piece 8 through a connecting rod 5. Further, as shown in fig. 1A-3, 6, and 7A-7E, the support assembly 6-7 further includes an avoiding structure for avoiding the first shaft 11, the avoiding structure includes a first waist-shaped hole 60 and a second waist-shaped hole 701 respectively disposed on the contact support 6 and the link support 7, and the first waist-shaped hole 601 and the second waist-shaped hole 701 are oppositely disposed for the first shaft 11 to pass through (it should be noted that the avoiding structure is not limited to the form of the waist-shaped hole, and may also be an avoiding groove respectively disposed on the contact support 6 and the link support 7). The handle 4 rotates, the support assembly 6-7 is driven to rotate around the second shaft 12 through the connecting rod 5, meanwhile, the contact support piece 6 drives the movable contact piece 1-10 to rotate around the first shaft 11 through the contact spring 16 until the movable contact piece 1-10 is initially contacted with the static contact 2, the handle 4 continues to rotate, the support assembly 6-7 is driven to continue to rotate around the second shaft 12 through the connecting rod 5, the support assembly 6-7 moves relative to the movable contact piece 1-10, the contact spring 16 is compressed, and the circuit breaker enters a closing state.

Preferably, as shown in fig. 6, an opening/closing indication part 705 is provided at one end of the substrate 70, and the opening/closing indication part 705 includes a closing indication surface 7500 and a opening indication surface 7501 which are provided side by side; an indicating hole matched with the opening and closing indicating part 705 is formed in the shell 3; when the circuit breaker is in a closing state, the closing indicating surface 7500 and the indicating hole are observed relatively, and when the circuit breaker is in an opening state, the opening indicating surface 7051 and the indicating hole are observed relatively.

Preferably, as shown in fig. 2, 3, 6 and 8, the contact support 6 is integrally formed into a U-shaped structure, and includes a connecting plate 63, and a first plate 61 and a second plate 62 respectively connected to the connecting plate 63 in a bent manner; the connecting rod supporting part 7 comprises a base plate 70 and a connecting arm 71, the base plate 70 is arranged on the outer side of the first plate 61 and is connected with the first plate 61 (positioned on the outer side of the first plate 61 and the second plate 62), one end of the connecting arm 71 is connected with the base plate 70, and the other end of the connecting arm 71 penetrates through the first plate 61 from the upper part of the first plate 61 and is connected with the second plate 62; one end of the movable contact piece 1-10 is interposed between the first plate 61 and the second plate 62 and the end is elastically and drivingly connected to the contact support 6. Further, as shown in fig. 7D, when the circuit breaker is tripped or opened, the contact spring 16 drives the movable contact members 1-10 to rotate, so that one ends of the movable contact members 1-10 inserted between the first plate 61 and the second plate 62 are in limit fit with the connecting arm 71.

Preferably, as shown in fig. 1A, 1C, 3, 6, 7A and 7B, the link support 7 further includes a latch shaft 706 and a trip shaft 707 disposed on the base plate 70, the latch shaft 706 and the trip shaft 707 are disposed on one side of the base plate 70, the connecting arm 71 is disposed on the other side of the base plate 70, and the latch 8 and the trip 9 are respectively pivotally disposed on the base plate 70 through the latch shaft 706 and the trip shaft 707.

Preferably, as shown in fig. 7A, when the circuit breaker is opened, the first displacement rotation angle α of the support assembly 6-7 around the second shaft 12 is less than the second displacement rotation angle β of the movable contact piece 1-10 around the first shaft 11, so that the movable contact piece 1-10 of the circuit breaker has a larger electrical gap when disconnected from the stationary contact 2, which is beneficial to improving the insulation. Specifically, as shown in fig. 7D, the spacing between the limiting rib 1050 and the first shaft 11 is R0, the spacing between the limiting rib 1050 and the second shaft 12 is R1, and R0 < R1, so that the first displacement rotation angle α of the supporting assembly 6-7 around the second shaft 12 < the second displacement rotation angle β of the movable contact piece 1-10 around the first shaft 11.

Preferably, as shown in fig. 1A, 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) respectively in driving cooperation with the trip 9; when a short-circuit fault or an overload fault occurs, the short-circuit protection mechanism or the overload protection mechanism drives the tripping buckle 9 to rotate, so that the tripping buckle 9 is disengaged from the buckle of the buckle 8, the support component reset spring drives the support components 6-7 to rotate, and meanwhile, the contact spring 16 drives the movable contact pieces 1-10 to reset, so that the movable contact pieces 1-10 are disconnected from the static contact 2.

Specifically, as shown in fig. 1A, 1C, 7A, 7B, and 7C, one end of the jump buckle 8 is pivotally disposed on the connecting rod support 7 through a jump buckle shaft 706 and the middle of the buckle 9 through a buckle shaft 707, the first buckle tooth 81 at the other end of the jump buckle 8 is connected with the first buckle platform 91 at one end of the buckle 9 in a locking manner, and the handle 4 is drivingly connected with the middle of the jump buckle 8 through the connecting rod 5; as shown in fig. 1A, 3, 6, 7A and 7B, the switching-on/off indication part 705 is disposed at the upper end of the substrate 70, and the upper side wall of the housing 3 is provided with an indication hole which is matched with the switching-on/off indication part 70; as shown in fig. 1A, 7B, 7D, and 7E, taking the side facing the reader in each figure as the front side, the contact support 6, the movable contact pieces 1-10, the link support 7, the latch 8, and the jumper 9 are all disposed between a pair of sidewalls of the housing 3, the upper ends of the movable contact pieces 1-10 are inserted between the first plate 61 and the second plate 62 of the contact support 6 and located on the left side of the connecting arm 71, the lower ends are engaged with the fixed contact 2, the base plate 70 of the link support 7 is disposed on the front side of the first plate 61, the front end of the connecting arm 71 is connected to the base plate 70, the rear end is connected to the second plate 62, the latch 8 and the jumper 9 are both located on the front side of the base plate 70, and the two ends of the link 5 are respectively inserted into the handle 4 and the latch 8 from the. As shown in fig. 7A, 7B, 7C, and 7E, the operation of the operating mechanism of the circuit breaker of the present invention is as follows: as shown in fig. 7A, 7B and 7D, when the circuit breaker is in an open state, the handle 4 is pulled to rotate clockwise, the handle 4 drives the support assembly 6-7, the latch 8 and the jumper 9 to rotate clockwise around the second shaft 12 through the connecting rod 5, at the same time, the contact support 6 drives the movable contact piece 1-10 to rotate clockwise around the first shaft 11 through the contact spring 16 until the lower end of the movable contact piece 1-10 initially contacts with the fixed contact 2, the handle 4 is continuously pulled to rotate clockwise, the handle 4 drives the support assembly 6-7 to rotate continuously around the second shaft 12, the movable contact piece 1-10 does not rotate continuously due to the limitation of the fixed contact 2 and the first shaft 11, the support assembly 6-7 moves relative to the movable contact piece 1-10, the contact spring 16 is compressed to provide contact pressure for the movable contact piece 1-10 and the fixed contact 2, the circuit breaker then enters the closed state shown in fig. 7E; as shown in fig. 7E, when the circuit breaker is in a closed state and a short circuit or overload fault occurs, the short circuit protection mechanism or overload protection mechanism drives the trip catch 9 to rotate counterclockwise, so that the trip catch 9 is disengaged from the latch of the latch 8, the contact spring 16 drives the support assembly 6-7 to rotate relative to the movable contact piece 1-10, so that the limit plane 702 of the connecting arm 71 of the connecting rod support 7 is in contact with and in limit fit with the limit convex rib 1050 of the first bracket limit portion 105 of the contact support 10, the support assembly reset spring drives the support assembly 6-7 to rotate counterclockwise around the second shaft 12, the support assembly 6-7 drives the movable contact piece 1-10 to rotate counterclockwise around the first shaft 11, and the lower end of the movable contact piece 1-10 is disconnected from the fixed contact 2; as shown in fig. 7E, the circuit breaker is in a closing state, the handle 4 is toggled to rotate counterclockwise, the supporting components 6-7 lose the force balance state, the supporting components are driven by the supporting component return spring to rotate counterclockwise, meanwhile, the contact spring 16 drives the movable contact pieces 1-10 to return, the movable contact pieces 1-10 are in limit fit with the connecting arm 71 of the connecting rod supporting piece 7, and the circuit breaker enters a tripping state shown in fig. 7A, 7B and 7D; as shown in fig. 7A, when the circuit breaker is tripped or opened, the support assembly 6-7 rotates counterclockwise around the second shaft 12, the angular displacement of the support assembly 6-7 is a first displacement angle α, the movable contact piece 1-10 rotates counterclockwise around the first shaft 11, the angular displacement of the movable contact piece 1-10 is a second displacement angle β, and the first displacement angle α < the second displacement angle β.

Preferably, as shown in fig. 7D, 7E and 8, the contact spring 16 is a torsion spring, two contact springs 16 are respectively disposed on two sides of the movable contact member 1-10 and are both sleeved on the first shaft 11, and two ends of each contact spring 16 are respectively connected to the contact support member 6 and the movable contact member 1-10. Further, as shown in fig. 2, the movable contact support 6 further includes two spring limiting arms 602 disposed on the first plate 61 and the second plate 62 respectively and disposed oppositely, the contact spring 16 is a torsion spring, the two contact springs are disposed on two sides of the movable contact 1-10 respectively 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 1-10; one end of the movable contact pieces 1 to 10 interposed between the first plate 61 and the second plate 62 is located between the spring stopper arm 602 and the connecting arm 71. It should be noted that the contact spring 16 is not limited to a torsion spring, but may be a compression spring, and can be implemented by simply modifying the structure of the movable contact pieces 1-10.

Preferably, as shown in fig. 5, 7D, 7E and 8, the movable contact pieces 1-10 include a contact support 10 and a movable contact 1, wherein one end of the movable contact 1 is inserted on the contact support 10, and the other end is matched with the fixed contact 2. Further, as shown in fig. 7D and 7E, the contact holder 10 further includes a first holder limiting portion 105, the first holder limiting portion 105 is located at an edge of the contact holder 10 opposite to the movable contact 1, the first holder 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, and when the circuit breaker trips or is opened, the contact spring 16 drives the movable contact 1 to rotate, so that the first holder limiting portion 105 is in limiting fit with the connecting arm 71. Specifically, as shown in fig. 7D and 7E, the upper end of the movable contact 1 is inserted into the contact support 10, the lower end of the movable contact is matched with the fixed contact 2, and the first support limiting portion 105 is disposed at the upper end of the contact support 10. Further, as shown in fig. 3, one side of the connecting arm 71 is provided with a limiting plane 702, as shown in fig. 4, the first bracket limiting portion 105 includes a limiting convex rib 1050, as shown in fig. 7D, when the movable contact pieces 1 to 10 and the static contact 2 are in an open state, the limiting convex rib 1050 is in limiting fit with the limiting plane 702, as shown in fig. 7E, when the movable contact pieces 1 to 10 and the static contact 2 are in a closed state, a gap exists between the limiting convex rib 1050 and the limiting plane 702.

Preferably, as shown in fig. 2, 3 and 6, the connecting rod support 7 further includes a first connecting boss 703 and a second connecting boss 704 respectively disposed on the free ends of the base plate 70 and the connecting arm 71; the contact support 6 further comprises a first connection hole 603 and a second connection hole 604 provided on the first plate 61 and the second plate 62, respectively; the first connection boss 703 and the second connection boss 704 are respectively inserted into and matched with the first connection hole 603 and the second connection hole 604. It should be noted that the connecting rod support 7 and the contact support 6 are not limited to the above-mentioned connection method, and they may be connected by a snap-fit method.

As shown in fig. 2, is an embodiment of the contact support 6.

As shown in fig. 2, the contact support member 6 is a U-shaped structure as a whole, and includes a connecting plate 63 and a first plate 61 and a second plate 62 which are arranged oppositely, each of the first plate 61 and the second plate 62 includes a connecting edge, one end of the connecting edge of the first plate 61 and the second plate 62 is connected to two ends of the connecting plate 63, each of the other ends of the connecting edges of the first plate 61 and the second plate 62 is provided with a spring limiting arm 602, the other spring limiting arms 602 are arranged oppositely, each of the first plate 61 and the second plate 62 is provided with a first waist-shaped hole 601 for avoiding the first shaft 11 and a contact support shaft hole 605 for cooperating with the second shaft 12, each of the first waist-shaped holes 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, one end of the first plate 61, which is far from the spring limiting arm 602 and the connecting, the second connecting plate 62 is further provided with a second connecting hole 604, and the second connecting hole 604 is disposed near the spring limiting arm 602.

Specifically, as shown in fig. 2, the side facing the reader in fig. 2 is a front side, the front ends of the first plate 61 and the second plate 62 are respective connection edges, the right ends of the connection edges of the first plate 61 and the second plate 62 are respectively connected with the upper end and the lower end of the connection plate 63 in a bending manner, the left ends of the connection edges of the first plate 61 and the second plate 62 are respectively provided with a spring limiting arm 602, the two spring limiting arms 602 are arranged oppositely, the middle parts of the first plate 61 and the second plate 62 are respectively provided with a first waist-shaped hole 601 and a contact support shaft hole 605, the contact support 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.

As shown in fig. 3, is an embodiment of the link support 7.

As shown in fig. 3, the link support 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 in limiting fit with the limiting convex rib 1050 of the movable contact member 1-10, the other side of the base plate 70 is provided with a latch shaft 706 and a trip shaft 707, the base plate 70 is further provided with a second kidney-shaped hole 701 for avoiding the first shaft 11 and a link support shaft hole 705 in matching with the second shaft 12, the connecting arm 71 and the link support shaft hole 705 are respectively located at two ends of the base plate 70, the second kidney-shaped hole 701 is located between the connecting arm 71 and the link support shaft hole 705, the latch shaft 706 and the trip shaft 707 are located at one side of the second kidney-shaped hole 701 and the link support shaft hole 705, an opening and closing indication portion is further located at an edge of the base plate 70 close to.

Specifically, as shown in fig. 3, the right end of the connecting arm 71 is vertically connected with the upper end of the 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 a limiting plane 702, the right side of the base plate 70 is provided with a latch shaft 706 and a trip shaft 707, the base plate 70 is further provided with a second waist-shaped hole 701 and a link support shaft hole 705, the opening and closing support part 705 is arranged at the upper end of the base plate 70, the trip shaft 707 and the link support shaft hole 705 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 shaft hole 705, and.

As shown in fig. 4 and 5, is one embodiment of the movable contact piece 1-10.

As shown in fig. 5, the moving contact pieces 1-10 include 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 matched with the static contact 2; the contact support 10 comprises a contact slot 104 and a moving contact shaft hole 101, the contact slot 104 is arranged in the middle of the contact support 10, and the moving contact shaft hole 101 penetrates through the contact support 10 in the thickness direction of the contact support 10; the moving contact 1 comprises a moving contact limiting groove 101a arranged on one side edge of the moving contact 1, one end of the moving contact 1 is inserted into the contact slot 104, and the first shaft 11 penetrates through the moving contact shaft hole 101 and is in limiting fit with the moving contact shaft hole 101 to prevent the moving contact 1 from being separated from the contact slot 104. Further, as shown in fig. 4, the contact holder 10 further includes a first holder limiting portion 105, the first holder limiting portion 105 is located at an edge of the contact holder 10 opposite to the movable contact 1, the first holder limiting portion 105 is located between the spring limiting arm 602 of the contact support 6 and the connecting arm 71 of the link support 7, and when the circuit breaker trips or is opened, the contact spring 16 drives the movable contact 1-10 to rotate, so that the first holder limiting portion 105 is in limiting fit with the connecting arm 71. Further, as shown in fig. 4, a limiting convex rib 1050 which is in limiting fit with the limiting plane 702 of the connecting rod supporting member 7 is arranged on one side of the first bracket limiting portion 105. Further, as shown in fig. 4, the contact holder 10 further includes two second holder limiting portions 106 respectively disposed at two sides thereof, and a distance between free ends of the two second holder limiting portions 106 matches a distance between the first plate 61 and the second plate 62 of the contact support 6, so that the movable contact element 1-10 can stably and smoothly rotate between the first plate 61 and the second plate 62, but does not move along the axial direction of the first shaft 11, thereby ensuring reliable matching between the movable contact element 1-10 and the stationary contact 2. Further, as shown in fig. 4, the contact holder 10 further includes two spring stoppers 103 respectively disposed at two sides thereof, and two ends of each contact spring 16 are respectively connected to the spring stopper arm 602 and the spring stopper 103 of the contact support 6.

Specifically, as shown in fig. 4, the contact slot 104 is disposed in the middle of the contact support 10 and has a downward opening, the moving contact shaft hole 101 is disposed in the middle of the contact support 10 and penetrates through the contact support 10 from the width direction of the contact support 10, the first support limiting portion 105 is disposed at the top end of the contact support 10, the second support limiting portion 106 is disposed between the first support limiting portion 105 and the moving contact shaft hole 101, the two spring limiting blocks 103 are disposed on two sides of the right end of the contact support 10, and the limiting convex rib 1050 is disposed on the right side of the first support limiting portion 1050.

Preferably, the second support limiting part 106 is an arc-shaped convex rib with the moving contact shaft hole 101 as a circle center; two ends of the moving contact shaft hole 101 are respectively provided with an annular boss 1010, and the contact spring 16 is sleeved on the annular boss 1010.

Preferably, as shown in fig. 1, a pair of side walls of the housing 3 are respectively provided with a mounting boss 30, each mounting boss 30 is provided with a first shaft mounting hole 301 and a second shaft mounting hole 302, two ends of the first shaft 11 are respectively disposed in the two first shaft mounting holes 301, and two ends of the second shaft 12 are respectively disposed in the two second shaft mounting holes 302.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A circuit breaker comprises a shell (3), an operating mechanism, a movable contact piece (1-10) and a static contact (2), wherein the operating mechanism, the movable contact piece (1-10) and the static contact (2) are arranged in the shell (3), the operating mechanism is connected with the movable contact piece (1-10) in a driving mode, and the movable contact piece (1-10) and the static contact (2) are driven to be closed/opened;

the method is characterized in that: the operating mechanism comprises a handle (4) which is pivotally arranged on the shell (3), a connecting rod (5), a contact spring (16), a supporting component (6-7), a locking piece (8) and a tripping piece (9); the handle (4) is in driving connection with the supporting component (6-7) through the connecting rod (5), and the supporting component (6-7) and the movable contact piece (1-10) are respectively arranged on the shell (3) in a pivoting mode through the second shaft (12) and the first shaft (11); the supporting assembly (6-7) comprises a contact supporting piece (6) and a connecting rod supporting piece (7) which are fixedly connected, the contact supporting piece (6) is connected with the movable contact piece (1-10) in an elastic driving mode through a contact spring (16), the locking piece (8) and the tripping piece (9) are matched in a locking mode and are arranged on the connecting rod supporting piece (7) in a pivoting mode respectively, and the handle (4) is connected with the locking piece (8) through a connecting rod (5).

2. The circuit breaker of claim 1, wherein: the support assembly (6-7) further comprises an avoiding structure for avoiding the first shaft (11), the avoiding structure comprises a first waist-shaped hole (601) and a second waist-shaped hole (701) which are respectively arranged on the contact support piece (6) and the connecting rod support piece (7), and the first waist-shaped hole (601) and the second waist-shaped hole (701) are correspondingly arranged to allow the first shaft (11) to pass through.

3. The circuit breaker according to claim 1 or 2, characterized in that: the handle (4) rotates, the supporting component (6-7) is driven to rotate around the second shaft (12) through the connecting rod (5), meanwhile, the contact supporting piece (6) drives the movable contact piece (1-10) to rotate around the first shaft (11) through the contact spring (16) until the movable contact piece (1-10) is initially contacted with the static contact (2), the handle (4) continues to rotate, the supporting component (6-7) is driven to continue to rotate around the second shaft (12) through the connecting rod (5), the supporting component (6-7) moves relative to the movable contact piece (1-10), the contact spring (16) is compressed, and the circuit breaker enters a closing state.

4. The circuit breaker according to claim 1 or 2, characterized in that: the contact support piece (6) is integrally of a U-shaped structure and comprises a connecting plate (63) and a first plate (61) and a second plate (62) which are respectively connected with the connecting plate (63) in a bending mode and are arranged oppositely; the connecting rod supporting piece (7) comprises a base plate (70) and a connecting arm (71), the base plate (70) is arranged on the outer side of the first plate (61) and connected with the first plate (61), one end of the connecting arm (71) is connected with the base plate (70), and the other end of the connecting arm is connected with the second plate (62); one end of the movable contact piece (1-10) is inserted between the first plate (61) and the second plate (62) and the end is elastically connected with the contact support piece (6) in a driving way.

5. The circuit breaker according to claim 1 or 4, characterized in that: the contact support piece (6) is formed by bending and stamping a metal plate; the connecting rod supporting piece (7) is an injection molding piece.

6. The circuit breaker of claim 4, wherein: the connecting rod supporting piece (7) further comprises a locking shaft (706) and a jumping shaft (707) which are arranged on the substrate (70), the locking shaft (706) and the jumping shaft (707) are arranged on one side of the substrate (70), the connecting arm (71) is arranged on the other side of the substrate (70), and the lock catch (8) and the jumping catch (9) are respectively arranged on the substrate (70) in a pivoting mode through the locking shaft (706) and the jumping shaft (707).

7. The circuit breaker of claim 4, wherein: the connecting rod support (7) further comprises a first connecting boss (703) and a second connecting boss (704) which are respectively arranged at the free ends of the base plate (70) and the connecting arm (71); the contact support (6) further comprises a first connection hole (603) and a second connection hole (604) provided on the first plate (61) and the second plate (62), respectively; 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).

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

9. The circuit breaker of claim 4, wherein: when the circuit breaker is tripped or opened, the contact spring (16) drives the movable contact piece (1-10) to rotate, so that one end of the movable contact piece (1-10) inserted between the first plate (61) and the second plate (62) is in limit fit with the connecting arm (71).

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

one end of the substrate (70) is provided with a switching-on and switching-off indicating part (705), and the switching-on and switching-off indicating part (705) comprises a switching-on indicating surface (7500) and a switching-off indicating surface (7051) which are arranged in parallel; the shell (3) is provided with an indicating hole matched with the opening and closing indicating part (705); when the circuit breaker is in a closing state, the closing indicating surface (7500) and the indicating hole are relatively observed, and when the circuit breaker is in an opening state, the opening indicating surface (7051) and the indicating hole are relatively observed;

the contact support piece (6) is integrally of a U-shaped structure and comprises a connecting plate (63) and a first plate (61) and a second plate (62) which are arranged oppositely, the first plate (61) and the second plate (62) both comprise a connecting edge, one end of the connecting edge of the first plate (61) and one end of the connecting edge of the second plate (62) are respectively connected with two ends of the connecting plate (63), the other end of the connecting edge of the first plate (61) and the other end of the connecting edge of the second plate (62) are respectively provided with a spring limiting arm (602), the two spring limiting arms (602) are arranged oppositely, the first plate (61) and the second plate (62) are respectively provided with a first waist-shaped hole (601) used for avoiding the first shaft (11) and a contact support piece shaft hole (605) matched with the second shaft (12), each first waist-shaped hole (601) is positioned between the spring limiting arm (602) and the connecting plate (63), and the contact support piece shaft hole (605) is arranged on one side of the first waist-shaped, the contact support shaft hole (605) is arranged close to the connecting plate (63), one end of the first plate (61) far away from the spring limiting arm (602) and the connecting plate (63) is further provided with a first connecting hole (603), the second connecting 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);

the connecting rod supporting piece (7) comprises a base plate (70) and a connecting arm (71), one end of the connecting arm (71) is vertically connected with one side of the base plate (70), a second connecting boss (704) is arranged at the other end of the connecting arm (71), a limiting plane (702) in limiting fit with the movable contact pieces (1-10) is arranged at one side of the connecting arm (71), a locking shaft (706) and a jump-buckling shaft (707) are arranged at the other side of the base plate (70), a second waist-shaped hole (701) for avoiding the first shaft (11) and a connecting rod supporting piece shaft hole (705) matched with the second shaft (12) are further arranged on the base plate (70), the connecting arm (71) and the connecting rod supporting piece shaft hole (705) are respectively positioned at two ends of the base plate (70), the second waist-shaped hole (701) is positioned between the connecting arm (71) and the connecting rod supporting piece shaft hole (705), the locking shaft (706) and the jump-buckling shaft (707) are, the edge of the substrate (70) close to the connecting arm (71) is also provided with a switching-on and switching-off indicating part (705), and the switching-on and switching-off indicating part (705) comprises a switching-on indicating surface (7500) and a switching-off indicating surface (7051) which are arranged side by side;

the moving contact piece (1-10) comprises 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 of the moving contact is matched with the static contact (2); the contact support (10) comprises a contact slot (104) and a moving contact shaft hole (101), the contact slot (104) is arranged in the middle of the contact support (10), and the moving contact shaft hole (101) penetrates through the contact support (10) in the thickness direction of the contact support (10); the moving contact (1) comprises a moving contact limiting groove (101a) arranged on one side edge of the moving contact, one end of the moving contact (1) is inserted into the contact slot (104), and the first shaft (11) penetrates through the moving contact shaft hole (101) and is in limiting fit 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 connected with the contact support (10) in a driving way through a contact spring (16);

the contact support (10) further comprises 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 a spring limiting arm (602) of the contact support (6) and a connecting arm (71) of the connecting rod support (7), and when the circuit breaker trips or is opened, the contact spring (16) drives the moving contact pieces (1-10) to rotate, so that the first support limiting part (105) is in limiting fit with the connecting arm (71);

the contact support (10) further comprises two second support limiting parts (106) respectively arranged on two sides of the contact support, and the distance between the free ends of the two second support limiting parts (106) is matched with the distance between the first plate (61) and the second plate (62) of the contact support (6); a limiting convex rib (1050) in limiting fit with the limiting plane (702) of the connecting arm (71) is arranged on one side of the first bracket limiting part (105);

when the circuit breaker is tripped or opened, a first displacement rotating angle alpha of the supporting component (6-7) around the second shaft (12) is less than a second displacement rotating angle beta of the movable contact piece (1-10) around the first shaft (11);

a pair of side walls of the shell (3) are respectively provided with a mounting boss (30), each mounting boss (30) is provided with a first shaft mounting hole (301) and a second shaft mounting hole (302), two ends of a first shaft (11) are respectively arranged in the two first shaft mounting holes (301), and two ends of a second shaft (12) are respectively arranged in the two second shaft mounting holes (302);

the operating mechanism also comprises a support assembly return spring, and the circuit breaker also comprises a short-circuit protection mechanism and an overload protection mechanism which are respectively in driving fit with the jump buckle (9); when a short circuit or overload fault occurs, the short circuit protection mechanism or the overload protection mechanism drives the jump buckle (9) to rotate, so that the jump buckle (9) is disengaged from the lock catch of the lock catch (8), the support component reset spring drives the support components (6-7) to rotate, meanwhile, the contact spring (16) drives the movable contact pieces (1-10) to reset, and the movable contact pieces (1-10) are disconnected from the static contact (2).