Circuit breaker

Abstract

The utility model relates to a circuit breaker. The circuit breaker includes: a housing; the handle is movably connected to the shell; the contact mechanism comprises a static contact in the shell and a moving contact capable of moving relative to the static contact; the operating mechanism is connected between the handle and the moving contact and can be controlled by the handle to drive the moving contact to be connected with the static contact and drive the moving contact to be separated from the static contact; the contact bias pressing piece is constructed to apply bias pressure towards the static contact to the moving contact; and the quick-closing stop piece is movably arranged in the shell and has a first state for stopping the moving contact from getting close to the static contact and a second state for avoiding to allow the moving contact to be connected with the static contact, and during the first state, the contact bias piece is pressed to store energy.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, in particular to a circuit breaker. Background Art

[0002] Micro Circuit Breaker (MCB), also known as Miniature Circuit Breaker, is an important component of the power system. It can close, carry and disconnect current under normal circuit conditions, and can disconnect current within a specified time under abnormal circuit conditions (such as short circuit or overload), thereby effectively protecting other electrical appliances in the circuit.

[0003] There are certain requirements for the closing speed of the circuit breaker, so a fast closing mechanism is generally designed in the circuit breaker. The existing fast closing mechanism is relatively complex and involves many parts, which not only increases the cost but also reduces the reliability. Utility Model Content

[0004] The utility model aims to provide a circuit breaker, which can at least solve some of the above technical problems.

[0005] According to one aspect of the utility model, a circuit breaker is provided, comprising: a housing; a handle movably connected to the housing; a contact mechanism comprising a static contact in the housing and a moving contact movable relative to the static contact; an operating mechanism connected between the handle and the moving contact and configured to be controllable by the handle to drive the moving contact to engage with the static contact, and to drive the moving contact to separate from the static contact; a contact biasing member configured to apply a biasing force toward the static contact to the moving contact; a quick-closing stopper movably arranged in the housing and having a first state of blocking the moving contact from approaching the static contact, and a second state of avoiding to allow the moving contact to engage with the static contact, wherein during the first state, the contact biasing member is compressed and stores energy.

[0006] According to the circuit breaker provided in this embodiment, the quick-closing stopper moves to the first state in the housing, preventing the moving contact from approaching the static contact and closing the circuit. However, the force driving the moving contact to close the circuit still exists, so the contact biasing member accumulates kinetic energy while being continuously compressed and unable to release. Until the quick-closing stopper moves to the second state to avoid, allowing the moving contact to move and approach the static contact, the contact biasing member releases the accumulated kinetic energy and pushes the moving contact to close quickly. The entire rapid closing process is mainly achieved by the cooperation of the quick-closing stopper and its driving member (such as a handle), which has a simple structure and can effectively improve the reliability of the mechanism and reduce costs.

[0007] In some embodiments, the housing defines a channel, the quick-closing stopper is movably disposed along the channel, and is switched from the first state to the second state under the drive of the handle.

[0008] In some embodiments, the quick-closing stopper is pivotably disposed within the housing, and a portion of the quick-closing stopper is movably embedded in the channel.

[0009] In some embodiments, the quick-closing stopper is formed with a crank arm at a position close to the pivot axis, and the handle can be driven to engage the crank arm.

[0010] In some embodiments, the quick-closing stop member is also formed with an arc-shaped overhanging section extending away from the crank arm at a position near the pivot axis, and a rotating member that can be driven by the operating mechanism is provided in the housing, and the rotating member can drive and engage the arc-shaped overhanging section to switch it from the second state to the first state.

[0011] In some embodiments, the quick-closing stopper moves during the first state to its end away from the crank arm to extend out of the channel of the housing and block the operating mechanism, and moves during the second state to the end to retract into the channel of the housing to clear the operating mechanism.

[0012] In some embodiments, the handle includes: a base, which is pivotally connected to the shell and defines an opening, and the crank arm of the quick-closing stopper extends into the opening, wherein when the crank arm is close to one side of the opening, there is a gap between the crank arm and the other side of the opening; and a handle, which is connected to the base and extends from the shell.

[0013] In some embodiments, the quick-close stopper is an integrally formed elastic member.

[0014] In some embodiments, the operating mechanism includes: a contact support pivotally connected to the housing, wherein the moving contact is connected to the contact support, and the contact biasing member abuts against the contact support; a lock pivotally connected to the contact support and connected to the handle; a release member pivotally connected to the housing, the release member being configured to be able to lock with the lock to maintain the moving contact in a position engaged with the stationary contact, and to be able to separate from the lock to allow the moving contact to separate from the stationary contact; wherein, while the quick-closing stop member is in the first state, the quick-closing stop member blocks the contact support.

[0015] In some embodiments, the circuit breaker further comprises a handle biasing member, the handle biasing member being pressed between the handle and the tripping member and applying a biasing force toward the lock to the tripping member.

[0016] Some of the other features and advantages of the utility model will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 is the internal layout of a circuit breaker according to an embodiment of the utility model;

[0019] Figure 2 is a partial schematic diagram of a circuit breaker according to an embodiment of the utility model, wherein a handle, an operating mechanism and a quick-closing stopper are shown from one angle;

[0020] Figure 3 is a partial schematic diagram of a circuit breaker according to an embodiment of the utility model, wherein a handle, an operating mechanism and a quick-closing stopper are shown from another angle;

[0021] Figure 4 is a schematic diagram of a quick-closing stopper according to an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram showing that a quick-closing stopper is arranged in a housing according to an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1-circuit breaker; 2-housing; 21-first protrusion; 211-first section; 212-second section; 213-support; 22-second protrusion; 23-third protrusion; 24-fourth protrusion; 25-axis; 31-first terminal; 32-second terminal; 4-handle; 41-connecting rod; 42-handle biasing member; 421-first leg; 422-second leg; 43-base; 431-annular protrusion; 432-opening; 44-handle; 5-operating mechanism; 51- Lock; 52-tripping member; 53-contact support; 531-protrusion; 532-protruding portion; 533-shaft; 54-contact biasing member; 55-indicator; 551-hole; 552-slideway; 6-contact mechanism; 61-static contact; 62-moving contact; 7-quick closing stopper; 71-main body; 711-first end; 712-second end; 72-hole; 73-turn arm; 74-overhanging section; 75-stopper; 81-short-circuit tripping mechanism; 82-overload tripping mechanism; 9-arc extinguishing mechanism DETAILED DESCRIPTION

[0025] Now, with reference to the accompanying drawings, a schematic scheme of the circuit breaker disclosed in the utility model is described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0026] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0027] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0028] Figure 1 A circuit breaker 1 according to an embodiment of the utility model is shown, and the circuit breaker 1 can be any miniature circuit breaker (MCB) requiring short-circuit protection, a residual current operated circuit breaker (RCBO) with overcurrent protection, and an MCB product used in combination with a residual current operated circuit breaker (RCD).

[0029] like Figure 1 As shown, the circuit breaker 1 includes a housing 2 defining an internal space for accommodating an operating mechanism 5, a contact mechanism 6, an arc extinguishing mechanism 9, a tripping mechanism, a circuit, and the like. Figure 1 The structure and layout inside the housing 2 are generally shown. As shown in the figure, the housing 2 is respectively installed with a first terminal 31 and a second terminal 32 at opposite ends. The operating mechanism 5, the contact mechanism 6, the arc extinguishing mechanism 8 and the opening mechanism are arranged between the first terminal 31 and the second terminal 32. The first terminal 31 is connected to the static contact 61 of the contact mechanism 6, and the second connection terminal 32 is connected to the moving contact 62 of the contact mechanism 6, and the moving contact 62 is pivotally installed in the internal space of the housing 2 so as to engage with the static contact 61 to achieve closing, or separate from the static contact 622 to achieve opening. In this way, the circuit breaker 1 is connected to the circuit.

[0030] The handle 4 is pivotally connected to the housing 2 and is driven to the operating mechanism 5. By pivoting the handle 4, the operating mechanism 5 is driven to act, thereby pushing the moving contact 62 close to the stationary contact 61 and closing the switch, or pulling the moving contact 62 away from the stationary contact 61 and opening the switch.

[0031] like Figure 2 and Figure 3 In more detail, in the operating mechanism 5, the contact support 53 is pivotally mounted to the housing 2. In one embodiment, a pivot shaft is fixed to the inner wall of the housing 2, and a through hole is formed in the contact support 53. By inserting the pivot shaft of the housing into the through hole of the contact support, the contact support 53 can rotate relative to the housing 2, but cannot move relative to the housing 2 along the radial or axial direction of the pivot shaft. The moving contact 61 is mounted on the contact support 53 and can move with the contact support 53.

[0032] The contact support 53 can also be used to drive the status indicator 55 to align with the window on the housing 2 with different marks, thereby transmitting to the outside world the status information of whether the circuit breaker 1 is currently in the open or closed state. Figure 3 As shown, in one embodiment, the indicator 55 is formed with a hole 551 for passing through a pivot axis formed in the housing 2. The indicator 55 can thus rotate relative to the housing 2, but cannot move relative to the housing 2 along the radial or axial direction of the pivot axis. The indicator 55 is also formed with a slide groove 552 at a distance from the hole 551, and the contact support 53 is formed with a shaft 533, which can pass through the slide groove 552 and move along the slide groove 552. The rotation of the contact support 53 can drive the indicator 55 to rotate to indicate the state switching of the circuit breaker. Although the indicator is shown as a separate component in the figure, those skilled in the art will understand that the indicator can be a section integrated in the contact support or the lock, so that the movement of the lock or the contact support directly drives the indicator to rotate to switch different indication states.

[0033] The lock catch 51 is pivotally connected to the contact support 4. In one embodiment, the contact support 53 is provided with a pivot shaft, and the lock catch 51 has a through hole. By inserting the pivot shaft of the contact support 53 into the through hole of the lock catch 51, the lock catch 51 can rotate relative to the contact support 53, but cannot move relative to the contact support 53 along the radial or axial direction of the pivot shaft.

[0034] The lock catch 51 is provided with another through hole at a distance from the through hole through which the pivot axis is penetrated, for installing the connecting rod 41, and the connecting rod 41 is also connected to the handle 4. In this way, the movement of the lock catch 51 can be controlled by the handle 4. The pivoting of the handle 4 can drive the lock catch 51 to move together through the connecting rod 41, thereby driving the contact support 53 to rotate around the pivot axis.

[0035] The operating mechanism 5 also includes a release member 52. The release member 52 can be locked with the lock 51 to keep the moving contact 62 in a state of engagement with the stationary contact 61 to prevent the two contacts from separating, and can also be unlocked with the lock 61 to allow the moving contact 62 to separate from the stationary contact 61. In one embodiment, the release member 52 can be pivotally connected to the contact support 53, and can be driven by an external force to abut against the lock 51 to form a lock, or separated from the lock 51 to form an unlock. A pivot axis can be set by the contact support 53, and a through hole can be set in the release member 52, and the pivot axis of the contact support can be passed through the through hole of the release member to achieve the pivot connection between the two. Furthermore, the pivot axis of the contact support 53 for mounting the release member 52 can be coaxial with the pivot axis of the housing 2 for mounting the contact support 52. In one embodiment, the release member 52 can share the same pivot axis with the contact support 53.

[0036] Under normal circumstances, the tripping member 52 always abuts against the lock buckle 51 under the action of external force to limit the movement of the lock buckle 51 and the contact support 53 in the opening direction, thereby ensuring that the moving contact 62 installed on the contact support 53 can be stably engaged with the static contact 61 to achieve circuit conduction. Figure 1 When the lock 51 and the contact support 53 are rotated (eg, in the clockwise direction shown in FIG. Figure 1 The handle 14 rotates in the closing direction (for example, in the counterclockwise direction shown in FIG. 1 ) to overcome the pressure of the tripping member 52 and rotate, thereby driving the moving contact 62 away from the stationary contact 61 and opening the circuit breaker. Figure 1 When the lock 51 is rotated in the counterclockwise direction shown in FIG. Figure 1 The movable contact 62 rotates in the clockwise direction as shown, driving the movable contact 62 to approach the stationary contact 61 and close the circuit breaker.

[0037] A handle biasing member 42 is provided between the release member 52 and the handle 4. Figure 1 and Figure 2 As shown, the handle biasing member 42 may be constructed as a torsion spring abutting between the handle 4 and the release member 52 in one embodiment. Further, the handle 4 has a base 43 and a handle 44 extending from the base 43, wherein the base 43 is sleeved on a pivot shaft extending from the housing 2. The handle biasing member 42 in the form of a torsion spring is also sleeved on the pivot shaft, wherein the first leg 421 of the torsion spring abuts against the handle 4, and the second leg 422 of the torsion spring abuts against the release member 52 from the side of the release member 52 facing away from the lock 51. Thereby, the handle biasing member 42 applies a biasing force to the handle 4 to rotate it in the opening direction, and at the same time, the handle biasing member 42 applies a biasing force to the release member 52 to abut against the lock 51.

[0038] In addition to the external force provided by the handle 4, the force of the contact support 53 bringing the moving contact 62 toward the stationary contact 61 is also provided by the contact biasing member 54. The contact biasing member 54 here particularly provides a biasing force for quickly closing the moving contact 62. Figure 1 As shown, the contact biasing member 54 is configured as a compression spring abutting between the contact support 53 and the housing 2 in one embodiment. The contact support 53 may be provided with a protrusion 531 for sleeve-engaging the compression spring. Thereby, the contact biasing member 54 applies a biasing force toward the stationary contact 61 to the contact support 53. Those skilled in the art will appreciate that the contact biasing member 54 may be replaced with any suitable spring configuration, for example, in another embodiment, the contact biasing member may be configured as a torsion spring abutting between the contact support and the housing.

[0039] In order to achieve fast closing of the circuit breaker 1, a fast closing stopper 7 is installed in the housing 2. During closing, the fast closing stopper 7 blocks the moving contact that has not yet engaged with the static contact, so that the contact biasing member 54 accumulates energy. Once the fast closing stopper 7 releases the moving contact, the contact biasing member 54 applies all the kinetic energy to the moving contact, achieving fast closing.

[0040] In one embodiment, the quick-closing stopper 7 is an integrally formed elastic member or damping member, wherein the handle 4 is driven to engage with the quick-closing stopper 7, so that the quick-closing stopper 7 can move along a predetermined trajectory in the housing 2 to switch between a first state (or initial state or reset state) that can block the moving contact from closing and a second state that can avoid the moving contact to allow it to close. The predetermined trajectory can be constructed, for example, by a channel formed by the housing 2. Figure 5 As shown, the housing 2 is formed with a first protrusion 21 extending substantially in a direction perpendicular to the line connecting the first connecting terminal 31 and the second connecting terminal 32, and a second protrusion 22 and a third protrusion 23 spaced apart from each other, wherein the second protrusion 22 and the third protrusion 23 are arranged opposite to the first protrusion 21 on the same side of the first protrusion 21, thereby forming a channel for the quick-closing stopper 7 to move between the first protrusion 21, the second protrusion 22 and the third protrusion 23.

[0041] When the handle 4 rotates in the closing direction, the lock catch 51 is first pushed to rotate together with the contact support 53, driving the moving contact 62 to approach the stationary contact 61. At this time, the quick-closing stopper 7 extends from the channel and is in the first state, and the handle 4 has not yet engaged with the quick-closing stopper 7.

[0042] In the next stage of closing, the handle 4 continues to rotate in the closing direction, and the contact support 53 contacts the quick-closing stopper 7. Since the contact support 53 cannot pass the quick-closing stopper 7, the closing action of the moving contact 62 is blocked. In this stage, as the handle 4 rotates in the closing direction, the lock and the contact support are pushed by the connecting rod 41, and at the same time, the handle biasing member 42 continues to apply pressure to the release member 52, forcing it to press against the lock 51, so that the lock 51, together with the contact support 53 and the moving contact 62, tends to lean against the static contact 61, and during this period, the contact biasing member 54 is always under pressure. Due to the obstruction of the quick-closing stopper 7, the moving contact 62 cannot be closed temporarily, and this tendency is converted into kinetic energy accumulated in the contact biasing member 54.

[0043] Afterwards, the handle 4 continues to rotate in the closing direction and can engage with the quick closing stopper 7, driving the quick closing stopper 7 to move and clear the travel path of the contact support 53. The contact support 53 together with the moving contact 62 can be close to the stationary contact 61. At this time, the contact biasing member 54 releases the accumulated kinetic energy, pushing the contact support 53 together with the moving contact 62 to rotate quickly, thereby achieving quick closing.

[0044] When the circuit breaker is in the open state or is switching from the closed state to the open state, the indicator 55 can abut against the quick-closing stopper 7 to keep the quick-closing stopper 7 in the first state or reset it to the first state.

[0045] Figure 4 An example configuration of the quick closing stopper 7 is shown. As shown in the figure, the quick closing stopper 7 includes a long and narrow body 71. A hole 72 is formed at the first end 711 of the body 71, and the shaft 25 is fixed to the housing 2. By inserting the shaft 25 into the hole 72, the quick closing stopper 7 can pivot around the shaft 25. A fourth protrusion 24 is provided on the housing 2 below the shaft 25. The fourth protrusion 24 is configured in an arc shape coaxial with the shaft 25 to support the portion of the quick closing stopper 7 that is sleeved on the shaft 25. A stopper 75 is provided at the second end 712 of the body 71 opposite to the first end 711. During the period when the quick closing stopper 7 is in the first state, the stopper 75 extends from the channel of the housing 2 and blocks the moving contact 62 from closing, and during the period when the quick closing stopper 7 is in the second state, the stopper 75 retracts into the channel of the housing 2 to allow the moving contact 62 to close.

[0046] Adapting to the long and narrow configuration of the main body 71, the first protrusion 21 of the housing 2 has a first section 211 close to the first end of the main body 71, a support portion 213 close to the second end of the main body 71, and a second section 212 connected between the first section 211 and the support portion 213, wherein the first section 211 protrudes further from the housing 2 than the second section 212, and the support portion 213 is used to support the stopper 75 at the second end 712 of the main body 71. The second protrusion 22 is located at, for example, a substantially middle position of the main body 71 to limit the movement path of the main body 71, and the third protrusion 23 corresponds to the stopper 75 of the quick-closing stopper 7. When the stopper 75 exceeds the third protrusion 23, the quick-closing stopper 7 extends out of the channel of the housing 2 and is in the first state, and when the stopper 75 enters the range of the third protrusion 23, the quick-closing stopper 7 retracts into the channel of the housing 2 and is in the second state.

[0047] Corresponding to the stopper 75 , the contact support 53 may be provided with an extended protruding portion 532 for abutting against the stopper 75 .

[0048] The handle 4 can drive the quick-closing stopper 7 through the crank arm 73 disposed at the first end 711 of the main body 71. Figure 4 As shown in FIG. 1 , the crank arm 73 extends from the main body 71 at a position close to the pivot axis of the quick-closing stopper 7. Figure 3 As shown, the base 43 of the handle 4 is provided with an annular protrusion 431 extending discontinuously in the circumferential direction, and an opening 532 is formed at the discontinuity of the annular protrusion 431. The crank arm 73 of the quick closing stopper 7 extends into the opening 532. The size of the opening 532 is configured so that when the crank arm 73 leans against one side of the opening 532, there is a gap between the crank arm 73 and the other side of the opening 532. Thereby, the closing movement of the handle 4 can be driven to engage with the quick closing stopper 7 after a delay period of time, so as to allow the contact biasing member 54 to store energy before then.

[0049] At the first end 711 of the quick closing stopper 7, near the pivot axis of the quick closing stopper 7, an overhanging section 74 is further extended, which extends in an arc shape away from the crank arm 73. When the handle 4 is in the opening position or rotates from the closing position to the opening position, the indicator 55 pushes against the overhanging section 74 of the quick closing stopper 7, so that the quick closing stopper 7 is maintained in the first state or reset to the first state.

[0050] Although in the illustrated embodiment, the contact support drives the indicator member to move to hold or reset the quick-closing stop member to the first state, those skilled in the art will understand that the holding and resetting functions can also be achieved by other rotatable members that can be driven by the operating mechanism 5 (for example, by the contact support or the lock), and the rotatable member is, for example, pivotally mounted to the housing or directly integrated into the operating mechanism (for example, integrated into the contact support or the lock).

[0051] In addition to being triggered by the handle 4, the opening action of the operating mechanism 5 can also be triggered by the opening mechanism. When a specified current condition (such as a short circuit current or an overload current) occurs, the tripping member 52 will pivot and disengage from the lock under the drive of the opening mechanism. At this time, the restrictions originally applied to the lock 51 and the contact support 53 are released, and the circuit breaker 1 is allowed to open. Once the specified current condition is eliminated, the driving force applied to the tripping member by the opening mechanism disappears, and the tripping member 52 will be pressed against the lock 51 again, and the two will be re-locked.

[0052] In the illustrated embodiment, the circuit breaker 1 may be provided with two tripping mechanisms, namely a short-circuit tripping mechanism 81 and an overload tripping mechanism 82 .

[0053] The short-circuit trip mechanism 81 is, for example, an electromagnetic trip mechanism. In one embodiment, the electromagnetic trip mechanism includes a sleeve fixed in the housing 2, a coil around the outer circumference of the sleeve, a trip rod movably mounted in the sleeve along the axial direction, an armature sleeved on one end of the trip rod in the sleeve, and a yoke sleeved on the other end of the trip rod. The armature forms a driving fit with the trip rod. A reset spring is abutted between the trip rod and the armature. One end of the coil is connected to the first terminal 31, and the other end of the coil is connected to the static contact 61.

[0054] The overload tripping mechanism 82 is, for example, a bimetallic strip, wherein the bimetallic strip is connected between the moving contact 62 and the second terminal 32. When the current is overloaded, the bimetallic strip is deformed by heat and drives the tripping member 52 to rotate through the transmission member to disconnect from the lock 51.

[0055] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0056] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, characterized in that: include: Housing (2); A handle (4) movably connected to the housing (2); A contact mechanism (6) comprising a stationary contact (61) in the housing (2) and a moving contact (62) movable relative to the stationary contact (61); an operating mechanism (5) connected between the handle (4) and the moving contact (62) and configured to be controllable by the handle (4) to drive the moving contact (62) to engage with the stationary contact (61), and to drive the moving contact (62) to separate from the stationary contact (61); A contact biasing member (54) configured to apply a biasing force toward the stationary contact (61) to the movable contact (62); A quick-closing stopper (7) is movably arranged in the housing (2) and has a first state of blocking the moving contact (62) from approaching the stationary contact (61), and a second state of avoiding to allow the moving contact (62) to engage with the stationary contact (61), wherein during the first state, the contact biasing member (54) is compressed to store energy.

2. The circuit breaker according to claim 1, characterized in that: The housing (2) defines a channel, and the quick-closing stopper (7) is movably arranged along the channel and switches from the first state to the second state under the drive of the handle (4).

3. The circuit breaker according to claim 2, characterized in that: The quick-closing stopper (7) is pivotably arranged in the housing (2), and a part of the quick-closing stopper (7) is movably embedded in the channel.

4. The circuit breaker according to claim 3, characterized in that: The quick-closing stopper (7) is formed with a crank arm (73) at a position close to the pivot axis, and the handle (4) can be driven to engage the crank arm (73).

5. The circuit breaker according to claim 4, characterized in that: The quick-closing stopper (7) is also provided with an arc-shaped overhanging section (74) at a position close to the pivot axis and extending in a direction away from the crank arm (73). A rotating member that can be driven by the operating mechanism (5) is provided in the housing (2). The rotating member can drive and engage the arc-shaped overhanging section (74) to switch the state from the second state to the first state.

6. The circuit breaker according to claim 4, characterized in that: The quick-closing stopper (7) moves during the first state to the end thereof away from the crank arm (73) to extend out of the passage of the housing and block the operating mechanism (5), and moves during the second state to the end thereof to retract into the passage of the housing to clear the operating mechanism (5).

7. The circuit breaker according to claim 4, characterized in that: The handle (4) comprises: A base (43) is pivotally connected to the housing (2) and defines an opening (432), wherein the crank arm (73) of the quick-closing stopper (7) extends into the opening (432), wherein when the crank arm (73) is close to one side of the opening (432), a gap exists between the crank arm (73) and the other side of the opening (432); A handle (44) is connected to the base (43) and extends from the housing (2).

8. The circuit breaker according to claim 1, characterized in that: The quick-closing stopper (7) is an integrally formed elastic member.

9. The circuit breaker according to any one of claims 1 to 8, characterized in that: The operating mechanism (5) comprises: A contact support (53) pivotally connected to the housing (2), wherein the movable contact (62) is connected to the contact support (53), and the contact biasing member (54) abuts against the contact support (53); A lock (51) pivotably connected to the contact support (53) and connected to the handle (4); a release member (52) pivotally connected to the housing (2), the release member (52) being configured to be lockable with the lock catch (51) to hold the movable contact (62) in a position engaged with the stationary contact (61), and to be disengaged from the lock catch (51) to allow the movable contact (62) to be separated from the stationary contact (61); Wherein, while the quick-closing stopper (7) is in the first state, the quick-closing stopper (7) blocks the contact support (53).

10. The circuit breaker according to claim 9, characterized in that The circuit breaker further comprises a handle biasing member (42), wherein the handle biasing member (42) is pressed between the handle (4) and the release member (52) and applies a biasing force toward the lock (51) to the release member (52).

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