CN221101933U - Circuit breaker and electrical component - Google Patents

Abstract

The present utility model relates to a circuit breaker and an electrical component. The circuit breaker comprises a shell, a fixed contact (8), a moving contact assembly (2), a connecting rod mechanism (4), a handle assembly (6) and a tension spring (5), wherein the connecting rod mechanism (4) and the tension spring (5) are mutually matched to form: when the movable contact assembly (2) is kept at a position close to the fixed contact (8), the connecting rod mechanism (4) applies force to the handle assembly (6) through the tension spring (5), and the handle assembly (6) is finally kept at a position indicating that the circuit is in a connection state. In this way, when fusion welding occurs between the movable contact (21) and the fixed contact (8), even if the handle assembly (6) is pulled from the closed position to the open position, the linkage mechanism (4) and the tension spring (5) can enable the handle assembly (6) to be re-indicated in the closed position. Therefore, personal injury possibly caused by the fact that a circuit maintainer mistakenly opens the movable contact (21) and the fixed contact (8) can be prevented.

Description

Circuit breaker and electrical component

Technical Field

The utility model relates to the technical field of high-voltage or low-voltage electric appliances, in particular to a circuit breaker and an electric assembly comprising the circuit breaker.

Background

A circuit breaker is an element that functions in an electrical circuit to connect or disconnect the circuit. When the circuit breaker has some fault conditions, such as overlarge load current, service life end, contact surface reduction caused by friction and the like, fusion welding of a moving contact and a fixed contact in a closing state in the circuit breaker can occur. At this point, if someone pulls the breaker handle from the closed position to the open position, the breaker handle will not be indicated in the closed position, however, at this point the circuit may still be in communication, with a great risk if operated by the user.

In order to avoid personal injury caused by the fact that circuit maintenance personnel disconnect and maintain the circuit by mistake, the utility model provides a solution to ensure that a breaker handle automatically indicates the correct position when fusion welding occurs to the breaker so as to remind the connection state of the circuit.

Disclosure of utility model

The present utility model is directed to a circuit breaker for automatically maintaining a handle assembly of the circuit breaker in a correct position, particularly in or near a closed position when a moving contact and a stationary contact are welded, to alert a communication state of an electric circuit.

According to one aspect of the present utility model, there is provided a circuit breaker, comprising: a housing; the fixed contact is fixedly arranged in the shell; the movable contact assembly can rotate to be separated from or closed with the fixed contact; a link mechanism having an upper link and a lower link, an upper end of the upper link being connected to a first rotation shaft fixed to the housing, a lower end of the upper link being hinged to an upper end of the lower link through a hinge shaft, a lower end of the lower link being connected to the moving contact assembly; a handle assembly having a grip at a first end thereof, a second end thereof being configured to rotate about a second axis of rotation of the housing; the first end of the tension spring is connected to the first end of the handle assembly, the second end of the tension spring is connected to the hinge shaft of the connecting rod mechanism, and when the handle assembly rotates around the second rotating shaft, the tension spring can drive the connecting rod mechanism to move so as to enable the movable contact assembly to rotate; the connecting rod mechanism and the tension spring are mutually matched and arranged as follows: when the movable contact assembly is kept at a position close to the fixed contact, the connecting rod mechanism applies force to the handle assembly through the tension spring, and the force enables the handle assembly to be finally kept at a position indicating that the circuit is in a connection state.

According to the scheme, through setting up link mechanism and extension spring in the circuit breaker, when moving contact and stationary contact fusion welding, if rotate handle assembly along clockwise D1, the extension spring can keep handle assembly on closed position, and this can indicate circuit maintenance personnel circuit still be in connected state, consequently, can prevent effectively that circuit maintenance personnel from thinking that the circuit has been disconnected by mistake, and then avoid personnel's injury.

In one embodiment, when the movable contact assembly is kept in a position close to the fixed contact, the hinge shaft can be always located on the same side of a connecting line of the first rotating shaft and the second rotating shaft in a rotating range of the handle assembly, so that the tension spring applies force to the handle assembly, and the force enables the handle assembly to be finally kept in a position indicating that the circuit is in a connected state.

According to the scheme, by limiting the position of the hinge shaft of the connecting rod mechanism in the circuit breaker, when the movable contact and the fixed contact are welded and the handle assembly is rotated in the clockwise direction D1, the position of the hinge shaft can be ensured to be always positioned on the same side of the connecting line of the first rotating shaft and the second rotating shaft, and at the moment, the component force of the tension spring acting on the handle assembly can enable the handle assembly to finally return to the closed position or return to the vicinity of the closed position. Therefore, the position of the handle assembly can prompt the circuit maintainer that the circuit is still in a connection state, and further can effectively prevent the circuit maintainer from mistaking the circuit to be disconnected, thereby avoiding personal injury.

In one embodiment, the moving contact assembly includes a moving contact and a moving contact base having a first slot for receiving the moving contact, and when the moving contact assembly is closed with the fixed contact, a gap is provided between a lower surface of the moving contact and a lower inner surface of the first slot, the gap being configured to satisfy: when the movable contact assembly is kept at a position close to the fixed contact, the hinge shaft can be always positioned on the same side of a connecting line of the first rotating shaft and the second rotating shaft in the rotating range of the handle assembly.

In one embodiment, an additional layer is provided on the lower surface of the moving contact or on the lower inner surface of the first slot, the thickness of the additional layer ensuring that the gap satisfies: when the movable contact assembly is kept at a position close to the fixed contact, the hinge shaft can be always positioned on the same side of a connecting line of the first rotating shaft and the second rotating shaft in the rotating range of the handle assembly.

According to the two schemes, by setting the gap between the moving contact and the moving contact base during closing, when the moving contact and the fixed contact are welded and the handle assembly is rotated in the clockwise direction D1, the moving contact base is blocked by the welded moving contact and then stops rotating around the rotating shaft of the moving contact assembly. Therefore, the connecting line motion of the first rotating shaft and the second rotating shaft of the hinge shaft in the connecting rod mechanism can be reduced as far as possible, and the hinge shaft is always positioned on the same side of the connecting line. At this time, the component force of the tension spring acting on the handle assembly can enable the handle assembly to finally return to the closed position or return to the vicinity of the closed position, thereby prompting the circuit maintenance personnel that the circuit is still in the connected state and further preventing or avoiding personnel injury.

In one embodiment, the moving contact assembly includes a moving contact and a moving contact base having a second groove for receiving a lower end of the lower link, a distance between the lower end of the lower link and a rotation axis of the moving contact assembly satisfying: when the movable contact assembly is kept at a position close to the fixed contact, the hinge shaft can be always positioned on the same side of a connecting line of the first rotating shaft and the second rotating shaft in the rotating range of the handle assembly.

In one embodiment, an additional layer is provided on an inner surface of the second groove near the rotation axis of the moving contact assembly such that a distance between a lower end of the lower link and the rotation axis of the moving contact assembly satisfies: when the movable contact assembly is kept at a position close to the fixed contact, the hinge shaft can be always positioned on the same side of a connecting line of the first rotating shaft and the second rotating shaft in the rotating range of the handle assembly.

In one embodiment, the lower end of the lower link is located at a center point of the connection portion in the second groove, and is disposed away from the rotation axis of the moving contact assembly such that a distance between the lower end of the lower link and the rotation axis of the moving contact assembly satisfies: when the movable contact assembly is kept at a position close to the fixed contact, the hinge shaft can be always positioned on the same side of a connecting line of the first rotating shaft and the second rotating shaft in the rotating range of the handle assembly.

According to the three schemes, the distance between the lower end of the lower connecting rod and the rotating shaft of the moving contact assembly is set, so that the hinge shaft can be far away from the connecting line of the first rotating shaft and the second rotating shaft. When the moving contact and the fixed contact are welded and the handle assembly is rotated in the clockwise direction D1, the hinge shaft is always located at the same side of the connection line even though it may move toward the connection line along with the rotation of the handle assembly. Therefore, the component force of the tension spring acting on the handle assembly can enable the handle assembly to finally return to the closed position or return to the vicinity of the closed position, thereby prompting the circuit maintenance personnel that the circuit is still in the connected state and further preventing or avoiding personnel injury.

According to another aspect of the present utility model, there is also provided an electrical assembly in which the circuit breaker described above is provided.

Drawings

The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein,

Fig. 1 is a schematic diagram of a circuit breaker omitting a housing according to an embodiment of the present utility model;

fig. 2 is a schematic view of a link assembly of a circuit breaker omitting a housing according to an embodiment of the present utility model;

fig. 3 is a schematic view of a handle assembly of the circuit breaker omitting a housing according to an embodiment of the present utility model;

Fig. 4 is a schematic view of a link mechanism of a circuit breaker omitting a case according to an embodiment of the present utility model;

Fig. 5 is a schematic view of a link mechanism and a moving contact assembly of a circuit breaker omitting a housing according to an embodiment of the present utility model;

Fig. 6 is a schematic view of a moving contact base of a circuit breaker omitting a housing according to an embodiment of the present utility model;

Fig. 7 is a motion schematic of a link mechanism of a circuit breaker according to an embodiment of the present utility model.

Reference numerals illustrate:

100-breaker 1-connecting rod assembly 2-moving contact assembly

21-Moving contact 22-moving contact base 221-front side

222-Open 3-frame 4-linkage

41-Upper connecting rod 411-first upper connecting rod 412-second upper connecting rod

42-Lower link 421-first lower link 422-second lower link

43-Button link 431-first end of button link 432-second end of button link

433-Middle end 434-hole 5-tension spring of buckle link

51-First tension spring 52-second tension spring 6-handle Assembly

61-Upper cover 62-side wall 63-first fixing portion

64-Second fixing portion 65-handle 7-fastening support

8-Fixed contact O1-first fixed rotation shaft O2-second fixed rotation shaft

A-second rotation axis B-first rotation axis C-hinge axis

D1-clockwise D2-counterclockwise D3-widthwise

E-connection F-second groove G-first groove

K-gap

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

It should be understood that the directions of "up", "down", "left" and "right" used in the present utility model refer to the relative directions in the drawings for more clearly describing the specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model.

According to the embodiment of the utility model, the circuit breaker controls the closing or opening of a circuit through the closing or opening between the moving contact and the fixed contact of the circuit breaker.

As shown in fig. 1, the circuit breaker 100 may include a housing (not shown), and a link assembly 1 and a moving contact assembly 2 located within the housing, the moving contact assembly 2 being located below the link assembly 1. When the circuit is not welded, the motion of the connecting rod assembly 1 can drive the motion of the moving contact assembly 2 so as to achieve the purpose of closing or opening the circuit.

The linkage assembly 1 may include a frame 3 fixed to or integrally formed with a housing, a linkage mechanism 4, a tension spring 5, and a handle assembly 6. The frame 3 has an opening in the upper side through which the handle assembly 6 extends. The handle assembly 6 at least partially encloses the linkage 4 and the tension spring 5.

As shown in fig. 1, 2 and 4, the link mechanism 4 may include a pair of upper links 41, a pair of lower links 42 and a buckle link 43. The pair of upper links 41 includes a first upper link 411 and a second upper link 412, and the pair of lower links 42 includes a first lower link 421 and a second lower link 422. The buckle link 43 is generally bent having a left-hand first end 431, a right-hand second end 432, and an intermediate end 433 between the first and second ends. The line connecting the first end 431 and the intermediate end 433 is at an angle to the line connecting the second end 432 and the intermediate end 433. Wherein the buckle link 43 is located between the first upper link 411 and the second upper link 412, and a first end 431 thereof is rotatably connected to a first fixed rotation shaft O1 located on the frame 3 through a hole 434. The first rotation shaft B sequentially passes through the upper end of the first upper link 411, the middle end 433 of the buckle link 43, and the upper end of the second upper link 412, and articulates them together. And, the lower end of the first upper link 411 and the upper end of the first lower link 421 and the lower end of the second upper link 412 and the upper end of the second lower link 422 are hinged together by a hinge shaft C.

When the second end 432 of the buckling link 43 is buckled with the buckling support 7 on the frame 3, the link assembly 1 is in a rebuckled state, and at this time, the first rotation axis B sequentially passing through the first upper link 411, the buckling link 43 and the second upper link 412 becomes a fixed first rotation axis B.

Referring to fig. 1 to 3, the frame 3 also has a second rotation axis a about which the handle assembly 6 can rotate. The handle assembly 6 has an upper cover 61 and two side walls 62, the upper cover 61 being located between the two side walls 62, together forming a substantially U-shape. The upper cover 61 has a first fixing portion 63 and a second fixing portion 64 at positions near the two side walls 62, respectively. The linkage 4 and the tension spring 5 are centrally located in the width direction D3 within the U-shaped space formed by the handle assembly 6. The tension spring 5 may include a first tension spring 51 and a second tension spring 52, the first tension spring 51 being located at a side of the first upper link 411 remote from the buckle link 53, and the second tension spring 52 being located at a side of the second upper link 412 remote from the buckle link 53. Wherein one end of the first tension spring 51 is connected to the hinge shaft C, the other end thereof is connected to the first fixing portion 63 of the upper cover 61, and one end of the second tension spring 52 is also connected to the hinge shaft C, the other end thereof is connected to the second fixing portion 64 of the upper cover 61. The upper cover 61 may also have a handle 65 thereon.

As shown in fig. 2, 5 and 6, the lower end of the lower link 42 has a connection portion E for achieving connection between the link assembly 1 and the moving contact assembly 2. The moving contact assembly 2 may include at least one moving contact 21 and at least one moving contact base 22, wherein each moving contact 21 is mounted in a corresponding moving contact base 22.

The moving contact base 22 has a first groove G and two second grooves F. The second groove F is for cooperating with the connecting portion E of the link assembly 1. For example, the connection portion E may be a boss structure that is inserted into the second groove F to achieve connection therebetween. The moving contact 21 is fitted with the first groove G to be mounted in the moving contact base 22. The second grooves F are located on both sides of the width direction D3 of the moving contact base 22, and are communicated with the front side 221 of the moving contact base 22 to form openings 222. The connection E may be mounted to the moving contact base 22 or removed from the moving contact base 22 from the opening 222. The moving contact base 22 further has a second fixed rotation axis O2, i.e., a rotation axis of the moving contact assembly, and the moving contact base 22 is rotatable about the second fixed rotation axis O2. As shown in fig. 2 and 5, an accommodating space may be formed between the first lower link 421 and the second lower link 422 of the link mechanism 4 for accommodating the moving contact base 22.

As an example, the moving contact assembly 2 may further include three moving contact bases 22 and three moving contacts 21 corresponding to the three moving contact bases 22. Wherein the three moving contact bases 22 and the three moving contacts 21 may be arranged side by side in order along the width direction D3. The link assembly 1 may be mounted to the moving contact base 22 at the intermediate position through the connection portions E at both sides thereof.

In a normal state, if the handle assembly 6 is pulled to move the connecting rod assembly 1, the connecting part E drives the moving contact assembly 2 to rotate around the second fixed rotation axis O2, so that the switching-on and switching-off between the moving contact 21 and the fixed contact 8 are realized. For example, when the handle assembly 6 is pulled in the counterclockwise direction D2, the connecting portion E of the connecting rod assembly 1 drives the moving contact base 22 to rotate in the counterclockwise direction D2, so that the moving contact 21 contacts with the fixed contact 8 and is closed; when the handle assembly 6 is pulled in the clockwise direction D1, the connecting portion E of the connecting rod assembly 1 drives the moving contact base 22 to rotate in the clockwise direction D1, so that the moving contact 21 is separated from the fixed contact 8 and is opened.

Referring to fig. 1 and 5, when the circuit breaker 100 is in a closed state, the link assembly 1 downwardly presses the moving contact base 22 of the moving contact assembly 2 through the connection portion E, and the moving contact 21 is closed with the stationary contact 8. Since the moving contact 21 has an overrun, a gap K is generated between the lower end surface of the moving contact 21 and the groove G of the moving contact base 22 in the vertical direction in the closed state, as shown in fig. 5.

The present utility model provides a circuit breaker 100, in which a tension spring 5 in the circuit breaker 100 in a re-fastened state can finally indicate a handle assembly 6 in a correct position by its own elastic force when welding occurs. When fusion welding occurs between the moving contact 21 and the fixed contact 8, if the handle assembly 6 is pulled from the closed position to the open position, the connecting portion E drives the moving contact base 22 to rotate around the second fixed rotation axis O2 by a certain angle in the clockwise direction D1 until the upper surface of the first groove G and the lower end surface of the moving contact 21 contact each other. In this process, the first and second fixing portions 63 and 64 of the handle assembly 6 move from the left side of the line BC of the first rotation axis B and the hinge axis C to the right side of the line BC, passing through the dead point of the link mechanism 4. Further, the link mechanism 4 is moved by the rotation of the movable contact base 22 via the connection portion E. Wherein the tension spring 5 may apply a leftward force component to the handle assembly 6, which force component may rotate the handle assembly 6 about the stationary rotation a in a counterclockwise direction D2. The handle assembly 6 may eventually return to the previously closed position without additional external forces. As such, the design achieves technical results that are unexpected to those skilled in the art.

As shown in fig. 7, the position of the hinge shaft C in the circuit breaker 100 may be further set to be always located at the left side of the line AB connecting the second rotation axis a and the first rotation axis B. Specifically, when fusion welding occurs between the movable contact 21 and the stationary contact 8, if the handle assembly 6 is pulled from the closed position to the open position, even if the positions of the connecting portion E and the hinge shaft C are moved upward to the right, and thus the positions of the new connecting portion E ' and the hinge shaft C ' are reached, since the position of the new hinge shaft C ' is always located on the left side of the connection line AB, the tension spring 5 always applies a leftward component force to the handle assembly 6, which causes the handle assembly 6 to rotate in the counterclockwise direction D2 about the second rotation axis a, and finally returns to the closed position. As such, the design achieves technical results that are unexpected to those skilled in the art.

According to the circuit breaker 100 provided by the utility model, when fusion welding occurs between the movable contact 21 and the fixed contact 8, the linkage 4 and the tension spring 5 in the circuit breaker 100 can enable the handle assembly 6 to be re-indicated in the closed position even if the handle assembly 6 is pulled from the closed position to the open position. In this way, the hinge axis C in the linkage 4 is prevented from moving to the right of the line AB during rotation of the handle assembly 6, resulting in the handle assembly 6 being held in the disconnected position by a rightward component force exerted on it by the tension spring 5. Therefore, the circuit breaker 100 provided by the utility model can prevent the personal injury possibly caused by the fact that the circuit maintainer misuses the movable contact 21 and the fixed contact 8 to be disconnected.

As an exemplary embodiment, a gap K between the lower end surface of the moving contact 21 and the first groove G of the moving contact base 22 may be set to: when the movable contact 21 is welded to the stationary contact 8, the gap K may enable the hinge shaft C to be always positioned at the left side of the connection AB of the second rotation axis a and the first rotation axis B if the handle assembly 6 is rotated about the second rotation axis a. Specifically, the size of the gap K may be set to reduce the angle by which the moving contact base 22 rotates about the second fixed rotation axis O2 when the moving contact 21 is welded to the fixed contact 8, that is, the angle by which the line O2-E connecting the second fixed rotation axis O2 and the connecting portion E can rotate. This allows the hinge axis C in the linkage 4 to be always located to the left of the line AB during rotation of the handle assembly 6, as the angle through which the movable contact base 22 rotates about its second fixed rotational axis O2 decreases. Thus, the handle assembly 6 is always subjected to a leftward force component from the tension spring 5. Under this component force, the handle assembly 6 will eventually return and stay at or near the closed position. At this point, the handle assembly 6 is in the correct indicating position to alert the circuit maintainer that the circuit is still in a closed state, thereby preventing or avoiding personal injury.

As one example, the clearance K may be satisfied by adding a material to the upper surface of the first groove G or a material to the lower end surface of the movable contact 21 so that the hinge shaft C can always be located on the left side of the line AB of the second rotation axis a and the first rotation axis B. It will be appreciated that the person skilled in the art may also achieve the above object in any other suitable way.

As an exemplary embodiment, there is a distance between the connection E and the second fixed rotation axis O2, which may be set to: when the movable contact 21 is welded to the stationary contact 8, the handle assembly 6 may be rotated about the second rotation axis a by a distance such that the hinge axis C is always positioned at the left side of the connection AB of the second rotation axis a and the second rotation axis B. Since the hinge axis C in the linkage 4 is always located to the left of the line AB during rotation of the handle assembly 6, the handle assembly 6 is always subjected to a leftward component from the tension spring 5. Under this component force, the handle assembly 6 will eventually return and stay at or near the closed position. At this point, the handle assembly 6 is in the correct indicating position to alert the circuit maintainer that the circuit is still in a closed state, thereby preventing or avoiding personal injury.

As an example, the above-described arrangement of the distances may be achieved by adding a material in the second groove F of the movable contact base 22 or by eccentrically disposing the center point of the connecting portion E in a direction away from the second fixed rotation axis O2. For example, as shown in fig. 5 and 6, the second groove F may have a substantially C-shape, and additional material may be provided on the rounded bottom of the second groove F such that the distance is large enough to ensure that the hinge axis C is always located to the left of the line AB during rotation of the handle assembly 6. It will be appreciated that the person skilled in the art may also achieve the above object in any other suitable way.

The utility model also provides an electrical assembly provided with the circuit breaker described in the above embodiments.

The utility model relates to a circuit breaker and an electrical assembly with the same. The circuit breaker comprises a shell, a fixed contact 8, a moving contact assembly 2, a connecting rod mechanism 4, a handle assembly 6 and a tension spring 5, wherein the connecting rod mechanism 4 and the tension spring 5 are mutually matched and arranged in the following way: when the movable contact assembly 2 is kept in a position closely attached to the fixed contact 8, the link mechanism 4 applies a force to the handle assembly 6 through the tension spring 5, so that the handle assembly 6 is finally kept in a position indicating that the circuit is in a connected state. In this way, when fusion welding occurs between the moving contact 21 and the fixed contact 8, the link mechanism 4 and the tension spring 5 can cause the handle assembly 6 to be re-instructed in the closed position even if the handle assembly 6 is pulled from the closed position to the open position. Therefore, personal injury possibly caused by the fact that a circuit maintainer mistakenly opens the movable contact 21 and the fixed contact 8 can be prevented.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this utility model, and it is intended to be within the scope of the utility model.

Claims (9)

1. A circuit breaker (100), characterized in that the circuit breaker (100) comprises:

a housing;

the fixed contact (8), the fixed contact (8) is fixedly arranged in the shell;

the movable contact assembly (2) can rotate to be separated from or closed with the fixed contact (8);

A link mechanism (4), the link mechanism (4) having an upper link (41) and a lower link (42), an upper end of the upper link (41) being connected to a first rotation shaft (B) fixed to the housing, a lower end of the upper link (41) being hinged with an upper end of the lower link (42) through a hinge shaft (C), a lower end of the lower link (42) being connected to the moving contact assembly (2);

a handle assembly (6), a first end of the handle assembly (6) having a grip (65), a second end of the handle assembly (6) being arranged to rotate about a second axis of rotation (a) of the housing;

A tension spring (5), wherein a first end of the tension spring (5) is connected to a first end of the handle assembly (6), a second end of the tension spring (5) is connected to a hinge shaft (C) of the linkage mechanism (4), and when the handle assembly (6) rotates around the second rotation shaft (A), the tension spring (5) can drive the linkage mechanism (4) to move so as to enable the movable contact assembly (2) to rotate;

The connecting rod mechanism (4) and the tension spring (5) are mutually matched and arranged in a way that: when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the connecting rod mechanism (4) applies force to the handle assembly (6) through the tension spring (5), and the force enables the handle assembly (6) to be finally kept at a position indicating that the circuit is in a connection state.

2. The circuit breaker (100) of claim 1 wherein,

When the movable contact assembly (2) is kept at a position close to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6), so that the tension spring (5) applies a force to the handle assembly (6), and the handle assembly (6) is finally kept at a position indicating that a circuit is in a connection state by the force.

3. The circuit breaker (100) of claim 2, wherein the moving contact assembly (2) comprises a moving contact (21) and a moving contact base (22), the moving contact base (22) having a first slot (G) receiving the moving contact (21), the moving contact (21) having a gap (K) between a lower surface of the moving contact (21) and an underside inner surface of the first slot (G) when the moving contact assembly (2) is closed with the stationary contact (8), the gap (K) being arranged to satisfy:

when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6).

4. A circuit breaker (100) according to claim 3, characterized in that an additional layer is provided on the lower surface of the moving contact (21) or on the lower inner surface of the first slot (G), the thickness of said additional layer ensuring that the gap (K) satisfies: when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6).

5. The circuit breaker (100) of claim 2 wherein the moving contact assembly (2) includes a moving contact (21) and a moving contact base (22), the moving contact base (22) having a second slot (F) for receiving a lower end of the lower link (42), a distance between the lower end of the lower link (42) and a rotational axis of the moving contact assembly (2) satisfying: when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6).

6. The circuit breaker (100) of claim 5 wherein the second slot (F) is provided with an additional layer on the inner surface of the second slot (F) close to the rotation axis of the moving contact assembly (2) such that the distance between the lower end of the lower link (42) and the rotation axis of the moving contact assembly (2) satisfies: when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6).

7. The circuit breaker (100) of claim 5 wherein the lower end of the lower link (42) is located at a center point of the connection portion (E) in the second slot (F) at a position remote from the rotation axis of the moving contact assembly (2) such that a distance between the lower end of the lower link (42) and the rotation axis of the moving contact assembly (2) satisfies: when the movable contact assembly (2) is kept at a position closely attached to the fixed contact (8), the hinge shaft (C) can be always positioned on the same side of a connecting line of the first rotating shaft (B) and the second rotating shaft (A) in the rotating range of the handle assembly (6).

8. The circuit breaker (100) of claim 1 wherein the linkage mechanism (4) further comprises a snap link (43), a first end (431) of the snap link (43) rotatably connected to the housing, an intermediate end (433) of the snap link (43) hinged to the first rotational axis (B) such that the first rotational axis (B) is secured to the housing when a second end (432) of the snap link (43) is snapped to the housing.

9. An electrical assembly, characterized in that it is provided with a circuit breaker (100) according to any one of claims 1 to 8.