CN109786186B - Small-sized circuit breaker - Google Patents

Abstract

The invention relates to the field of low-voltage electrical appliances, and specifically to a small circuit breaker, which includes a button mechanism, a circuit breaker housing and a locking mechanism; the button mechanism is provided at one end of the circuit breaker housing and is slidably matched with it, and the locking mechanism includes a second The locking piece, the second locking piece is pivotally arranged on the circuit breaker housing, the circuit breaker housing includes a second opening provided on one side thereof, one end of the second locking piece is driven and matched with the button mechanism, and the other end passes through the second opening. The opening cooperates with the housing limit at the circuit breaker assembly position; when the button mechanism is pulled toward the outside of the circuit breaker housing, the button mechanism drives the second locking member to rotate, causing the second locking member to release the limiting cooperation with the circuit breaker assembly position. ; In the small circuit breaker of the present invention, the locking mechanism forms a reliable limit fit with the housing at the assembly position of the circuit breaker, ensuring the stability and reliability of the small circuit breaker assembly.

Description

Miniature Circuit Breaker

Technical field

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

Background technique

The use of circuit breakers can effectively improve the safety and reliable operation of electrical equipment. In order to meet the installation needs of different electrical equipment, small circuit breakers, as an important type of circuit breakers, have various structures and tend to be miniaturized as a whole. Existing small circuit breakers often have the following problems:

1. After the existing small circuit breaker is installed in place, the user often pulls out the circuit breaker due to misoperation. This is not conducive to the reliable and stable operation of the circuit breaker, and secondly, it creates safety hazards.

2. The existing small circuit breakers that perform opening/closing operations through a button mechanism close the circuit by pressing the button mechanism and open the circuit by pulling the button mechanism. When the user pulls the button mechanism to open the circuit, the pulling force is often too large, causing the small circuit breaker to be pulled out of the assembly position, which is not conducive to ensuring the reliability of the assembly and working stability of the small circuit breaker, and also poses a safety hazard.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a small circuit breaker, the locking mechanism of which forms a reliable limiting fit with the housing at the assembly position of the circuit breaker, ensuring the stability and reliability of the assembly of the small circuit breaker.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A small circuit breaker, which includes a button mechanism 1, a circuit breaker housing 2 and a locking mechanism; the button mechanism 1 is provided at one end of the circuit breaker housing 2 and slides with it, and the locking mechanism includes a second locking piece 4. The two locking parts 4 are pivotally arranged on the circuit breaker housing 2. The circuit breaker housing 2 includes a second opening 204 provided on one side of the circuit breaker housing 2. One end of the second locking part 4 is driven and matched with the button mechanism 1, and the other end passes through The second opening 204 cooperates with the housing limit of the circuit breaker assembly position; when the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the button mechanism 1 drives the second locking member 4 to rotate, so that the second locking member 4 is in contact with the circuit breaker. The housing in the assembly position releases the limiting fit.

Preferably, the button mechanism 1 includes a button head 10, a button body 11 and a first link 1050. One end of the first link 1050 is inserted into the button body 11 and drives in cooperation with the second locking member 4. The button head 10 is located at One side of the button body 11 is for the user to operate the button head 10. The first link 1050 is in transmission cooperation with the button body 11. When the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the first link 1050 drives the second locking member. 4 rotate to release the limiting fit between the second locking member 4 and the housing at the circuit breaker assembly position.

Preferably, the locking mechanism further includes a second locking spring, and the second locking member 4 includes a second locking member main body 41 and second locking member protrusions 40 and second locking member respectively provided at both ends of the second locking member body 41 . The driving arm 42 and the second locking member body 41 are pivotally installed on the circuit breaker housing 2. The second locking member driving arm 42 drives and cooperates with the first link 1050. The second locking spring causes the second locking member to The protrusion 40 protrudes through the second opening 204 on the outside of the circuit breaker housing 2. After the small circuit breaker is assembled to the circuit breaker assembly position and is in place, the second locking protrusion 40 passes through the second opening 204 and is The housing limit of the circuit breaker assembly position is matched. When the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the first link 1050 drives the second locking member driving arm 42 to rotate, causing the second locking member protrusion 40 to break the circuit. The circuit breaker housing 2 moves internally, and the second locking member 4 releases the limiting fit with the housing at the assembly position of the circuit breaker.

Preferably, the first connecting rod 1050 is a U-shaped rod, and the button body 11 is provided with a transmission rod mounting platform 12. One end of the first connecting rod 1050 passes through the transmission rod mounting platform 12 and forms a protrusion. The first transmission rod 3041 is on one side of the transmission rod mounting platform 12, and the first transmission rod 3041 drives and cooperates with the second locking member 4. When the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the first transmission rod 3041 drives the second locking member 4. The second locking member 4 rotates to release the limiting fit between the second locking member 4 and the housing in the circuit breaker assembly position.

Preferably, the small circuit breaker also includes an operating mechanism 5, a movable contact 56 and a stationary contact 560. The other end of the first link 1050 is connected to the operating mechanism 5, and the button mechanism 1 is connected to the operating mechanism 5 through the first link 1050. The mechanism 5 is driven and connected. When the button mechanism 1 is pressed toward the inside of the circuit breaker housing 2, the button mechanism 1 drives the operating mechanism 5 through the first link 1050, and the operating mechanism 5 drives the moving contact 56 and the stationary contact 560 to close; When the button mechanism 1 is pulled outside the circuit breaker housing 2, the button mechanism 1 drives the operating mechanism 5 through the first link 1050, and the operating mechanism 5 drives the movable contact 56 to disconnect from the stationary contact 560.

Preferably, the small circuit breaker also includes a short circuit protection mechanism 6 and an overload protection mechanism 9. When the small circuit breaker is in the closed state and a short circuit or overload fault occurs, the short circuit protection mechanism 6 or the overload protection mechanism 9 is driven to operate. The mechanism 5 acts, and the operating mechanism 5 drives the movable contact 56 to disconnect from the static contact 560 .

Preferably, the operating mechanism 5 also includes an opening lever 15. The opening lever 15 includes a connecting end of the opening lever and a driving end of the opening lever. The connecting end of the opening rod is connected to the button mechanism 1, and the driving end of the opening lever is connected to the operating end. The mechanism 5 drives and cooperates; when the small circuit breaker is in the closing state, press the button mechanism 1 into the circuit breaker housing 2, the opening lever 15 drives the operating mechanism 5 to act, and the operating mechanism 5 drives the moving contact 56 and the static contact 560 disconnected.

Preferably, the operating mechanism 5 also includes a button mechanism reset member 10a, and a guide boss 20 and a guide groove group that cooperate with the opening lever 15 and are provided on the circuit breaker housing 2; the guide groove group includes a first Guide groove 21, second guide groove 22, third guide groove 23, fourth guide groove 24 and fifth guide groove 25, first guide groove 21, second guide groove 22, third guide groove 23, fourth guide groove 24 and the fifth guide groove 25 are connected end to end to form an annular guide groove group surrounding the guide boss 20;

When the small circuit breaker is in the opening state, press the button mechanism 1, and the driving end of the opening lever 15 passes from the first guide groove 21, through the second guide groove 22, and into the third guide groove 23. The circuit breaker enters the closing state, release the button mechanism 1, the button mechanism reset member 10a drives the opening rod driving end from the third guide groove 23 into the fourth guide groove 24 through the button mechanism 1, and makes the opening rod driving end and the guide The boss 20 is limited to fit; press the button mechanism 1 again, the button mechanism 1 drives the operating mechanism 5 through the opening lever driving end, the operating mechanism 5 drives the button mechanism 1 to reset, and the button mechanism 1 drives the opening lever driving end from the fourth The guide groove 24 enters the first guide groove 21 through the fifth guide groove 25, and the small circuit breaker enters the opening state.

Preferably, the operating mechanism 5 also includes a transmission member 51, a second link 52, a locking member 53, a support member 54, a jumping member 55 and a first return spring 57. The transmission member 51 and the support member 54 pivot respectively. It is arranged on the circuit breaker housing 2, and the support member 54 is elastically connected to the circuit breaker housing 2 through the first return spring 57. The locking member 53 and the jumping member 55 are respectively pivoted on the support member 54. The button mechanism 1 The transmission member 51 is drivingly connected to the transmission member 51 through the first link 1050, and the transmission member 51 is drivingly connected to the locking member 53 through the second link 52. The locking member 53 and the jumping member 55 are locked and matched, and the jumping member 55 is connected with the supporting member 53. The component 54 is driven and matched, and the support component 54 is connected to the movable contact 56. When the small circuit breaker is in the closing state, after the tripper 55 of the operating mechanism 5 is driven, the support component 54 of the operating mechanism 5 drives the moving contact 56. Contact 56 is disconnected from stationary contact 560 .

Preferably, the miniature circuit breaker further includes an anti-closing mechanism, the anti-closing mechanism includes a first locking member 3 and a first locking spring. The first locking member 3 includes a first locking member body 31 and a first locking member body 31 and a first locking member 31. A first locking piece protrusion 30 and a first locking piece blocking arm 32 are provided at both ends of a locking piece body 31. The first locking piece body 31 is pivotably provided on the circuit breaker housing 2. The circuit breaker housing 2 includes a The first opening 203 on one side of the first locking spring is connected to the first locking member body 31 and the circuit breaker housing 2 respectively, so that the first locking member retaining arm 32 is locked and matched with the button mechanism 1, and Make the first locking piece protrusion 30 protrude outside the circuit breaker housing 2 through the first opening 203. After the small circuit breaker is assembled to the circuit breaker assembly position and is in place, the housing at the circuit breaker assembly position squeezes the second A locking piece protrusion 30 causes the first locking piece blocking arm 32 to tilt and unlock the button mechanism 1 .

In the small circuit breaker of the present invention, one end of the second locking piece of the locking mechanism cooperates with the housing limit at the assembly position of the circuit breaker to prevent the small circuit breaker of the present invention from being pulled out by mistake and ensure the stable and reliable operation of the circuit breaker. This prevents users from accidentally pulling out the circuit breaker and causing electric shock when the circuit breaker is closed, which is beneficial to improving electricity safety.

Description of the drawings

Figure 1 is a schematic structural diagram of a small circuit breaker of the present invention;

Figure 2 is a schematic structural diagram of the small circuit breaker of the present invention, showing the assembly relationship between the locking mechanism and the circuit breaker housing;

Figure 3 is a schematic diagram of the assembly structure of the button mechanism and locking mechanism of the present invention;

Figure 4 is a schematic structural diagram of the small circuit breaker of the present invention, showing the assembly relationship between the anti-closing mechanism and the circuit breaker housing;

Figure 5 is a schematic diagram of the assembly structure of the button mechanism and the anti-closing mechanism of the present invention;

Figure 6 is a schematic diagram of the assembly structure of the button mechanism and operating mechanism of the present invention;

Figure 7 is a schematic structural diagram of part A of Figure 6 of the present invention, showing the positional relationship between the opening rod and the guide boss and guide groove group when the circuit breaker is in the open state;

Figure 8 is a schematic structural diagram of the operating mechanism of the present invention;

Figure 9 is a schematic structural diagram of part B of Figure 8 of the present invention, showing the positional relationship between the opening rod and the guide boss and guide groove group when the circuit breaker is in the closed state;

Figure 10 is a schematic diagram of the movement trajectory of the opening lever in the guide groove group according to the present invention;

Figure 11 is a schematic structural diagram of the small circuit breaker of the present invention, showing the positional relationship between the wire insertion hole, the wire outlet hole, the wire outlet end and the second baffle;

Figure 12 is a schematic diagram of the assembly structure of the first baffle, linkage, button mechanism and circuit breaker housing of the present invention;

Figure 13 is a schematic structural diagram of the circuit breaker housing of the present invention, showing the assembly position of the second transmission rod;

Figure 14 is a schematic structural diagram of the indicating device of the present invention;

Figure 15 is a schematic exploded view of the indicating device of the present invention;

Figure 16 is a schematic structural diagram of the indicating device of the present invention, showing the assembly relationship between the reset part of the indicating device and the first baffle;

Figure 17 is a schematic structural diagram of the indicating device of the present invention, showing the assembly relationship between the linkage part and the reset part of the indicating device;

Figure 18 is a schematic structural diagram of the circuit breaker housing of the present invention, showing various openings in the circuit breaker housing;

Figure 19 is a schematic structural diagram of the operating mechanism of the present invention;

Figure 20 is a schematic structural diagram of the circuit breaker housing of the present invention, which shows the structure of the installation guide positioning steps.

Detailed ways

The specific implementation of the small circuit breaker of the present invention will be further described below with reference to the embodiments shown in Figures 1-19. The miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

The small circuit breaker of the present invention includes a circuit breaker housing 2, a button mechanism 1 provided on the circuit breaker housing 2 that slides with it, an operating mechanism 5 and a moving contact 56 provided in the circuit breaker housing 2. Static contact 560, short circuit protection mechanism 6, arc extinguishing mechanism 7 and overload protection mechanism 9; the button mechanism 1 is drivingly connected to the operating mechanism 5 through the first connecting rod 1050, and the operating mechanism 5 is connected to the movable contact 56, short circuit protection The mechanism 6 and the overload protection mechanism 9 are driven and cooperated with the operating mechanism 5 respectively to trigger the circuit breaker to trip when a corresponding fault occurs. The arc extinguishing mechanism 7 is used in conjunction with the moving contact 56 and the static contact 560 .

Preferably, the short-circuit protection mechanism 6 includes an electromagnetic release, and the overload protection mechanism 9 includes a bimetal and an adjusting screw.

Preferably, as shown in Figure 1, the button mechanism 1 is provided at one end of the circuit breaker housing 2, the short circuit protection mechanism 6 and the arc extinguishing mechanism 7 are both provided at the other end of the circuit breaker housing 2, and the operating mechanism 5 is provided at the button Between the mechanism 1 and the short-circuit protection mechanism 6 , the overload protection mechanism 9 is provided on one side of the operating mechanism 5 and between the arc extinguishing mechanism 7 and the button mechanism 1 . Further, as shown in Figure 1, the small circuit breaker of the present invention also includes an outlet terminal 100 and an incoming terminal 8. The outlet terminal 100 is provided on one side of the button mechanism 1, and the outlet terminal 100 and the button mechanism 1 are located on the circuit breaker housing. 2, the incoming line terminal 8 is arranged on one side of the short-circuit protection mechanism 6 and the arc-extinguishing mechanism 7, and the incoming line terminal 8, the short-circuit protection mechanism 6 and the arc-extinguishing mechanism 7 are located at the same end of the circuit breaker housing 2; so The incoming line terminal 8 is a plug-in type terminal block. Specifically, as shown in Figure 1, the button mechanism 1 and the outlet terminal 100 are located at the upper end of the circuit breaker housing 2, the outlet terminal 100 is located on the left side of the button operating mechanism 1, and the operating mechanism 5 and the overload protection mechanism 9 are located at the circuit breaker. In the middle of the circuit breaker housing 2, the overload protection mechanism 9 is located on the left side of the operating mechanism 5, the short-circuit protection mechanism 6, the arc extinguishing mechanism 7 and the incoming terminal 8 are located at the lower end of the circuit breaker housing 2, and the incoming terminal 8 is located at the short-circuit protection mechanism 6 and the lower side of the arc extinguishing mechanism 7. It can be seen that in the small circuit breaker of the present invention, the circuit breaker housing 2 is reasonably planned and distributed, which not only ensures the reasonable layout and organic cooperation of each mechanism or component, but also fully utilizes the space of the circuit breaker housing 2 Utilization is beneficial to reducing the overall volume of the small circuit breaker of the present invention, so as to adapt to the miniaturization development trend of electrical equipment and reduce the installation space requirement of the circuit breaker. Moreover, the outlet terminal 100 and the button mechanism 1 are located at the same end of the circuit breaker housing 2, which facilitates the user to connect and disconnect the circuit breaker. The incoming terminal 8 is a plug-in terminal, which facilitates the circuit breaker to be connected to the main circuit. Whether it is incoming or outgoing wiring, there is no need to dismantle the installation cabinet used to install the circuit breaker, which significantly improves the convenience of wiring and is conducive to improving operational safety.

Preferably, as shown in Figures 4 and 5, the small circuit breaker of the present invention also includes an anti-closing mechanism. The button mechanism 1 is provided at one end of the circuit breaker housing 2 to slide with it. The anti-closing mechanism includes a first locking piece 3, The first locking piece 3 is pivoted on the circuit breaker housing 2. One end of the first locking piece 3 is locked with the button mechanism 1 to block the button mechanism 1 from moving in the closing direction. The small circuit breaker is assembled to the circuit breaker assembly position and After being installed in place, the housing at the assembly position of the circuit breaker acts on the first locking part 3, so that after the first locking part 3 and the button mechanism 1 are released from locking cooperation, the button mechanism 1 can move in the closing direction to perform the closing operation. The anti-closing mechanism ensures that the closing operation can be performed only after the small circuit breaker is installed in place, avoiding the situation that the circuit breaker cannot work properly due to poor contact caused by the small circuit breaker not being installed in place, and also avoiding the small circuit breaker. The circuit breaker is in virtual contact with the circuit breaker assembly position. During the closing operation, an arc is generated, causing ablation of the circuit breaker or the circuit breaker assembly position, affecting the service life. It also avoids the user getting an electric shock when operating the circuit breaker. Conducive to improving the safety of electricity use.

Preferably, as shown in Figures 4 and 5, the anti-closing mechanism also includes a first locking spring, and the first locking member 3 includes a first locking member body 31 and first locking members respectively provided at both ends of the first locking member body 31. The locking piece protrusion 30, the first locking piece blocking arm 32, the first locking piece main body 31 are pivoted on the circuit breaker housing 2, the first locking piece blocking arm 32 is bent and connected to the first locking piece main body 31, so The circuit breaker housing 2 includes a first opening 203 provided on one side thereof; the first locking spring is connected to the first locking member 3 and the circuit breaker housing 2 respectively, so that the first locking member blocking arm 32 is connected to the button. The mechanism 1 is locked and matched, and the first locking member protrusion 30 passes through the first opening 203 to protrude outside the circuit breaker housing 2; the small circuit breaker is assembled to the circuit breaker assembly position and is installed in place, the circuit breaker is assembled The housing in the position presses the first locking member protrusion 30 to move into the circuit breaker housing 2 , so that the first locking member retaining arm 32 and the button mechanism 1 are released from locking cooperation.

It should be pointed out that the locking cooperation between the button mechanism 1 and the first locking member blocking arm 32 means that after the button mechanism 1 is locked, it cannot move in the closing direction (as shown in Figure 1, the closing direction refers to (below), and after the locking fit is released, the button mechanism 1 can move in the closing direction, enabling the small circuit breaker of the present invention to open/close.

Preferably, as shown in Figures 2 and 3, the small circuit breaker of the present invention also includes a locking mechanism. The locking mechanism includes a second locking piece 4. The button mechanism 1 is provided at one end of the circuit breaker housing 2 and slides with it. The circuit breaker housing 2 includes a second opening 204 provided on one side thereof. The second locking member 4 is pivotally provided on the circuit breaker housing 2. One end of the second locking member 4 is drivingly engaged with the button mechanism 1, and the other end passes through the second opening. The hole 204 cooperates with the housing limit of the circuit breaker assembly position; when the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the button mechanism 1 drives the second locking member 4 to rotate, so that the second locking member 4 is in contact with the circuit breaker assembly position. The shell releases the limiting fit. The locking mechanism and one end of the second locking member 4 cooperate with the housing limit at the assembly position of the circuit breaker to prevent the small circuit breaker of the present invention from being accidentally pulled out, ensure the stable and reliable operation of the circuit breaker, and also prevent the user from inserting the circuit breaker into the circuit breaker. In the closed state, electric shock may occur if the circuit breaker is accidentally pulled out, which is helpful to improve the safety of electricity use.

Preferably, as shown in Figures 2 and 3, the locking mechanism further includes a second locking spring, and the second locking member 4 includes a second locking member body 41 and second locking members respectively provided at both ends of the second locking member body 41. The protrusion 40, the second locking member driving arm 42, and the second locking member main body 41 are pivoted on the circuit breaker housing 2 and are bent and connected with the second locking member driving arm 42; the circuit breaker housing 2 includes A second opening 204 is provided on one side thereof; the second locking spring is connected to the second locking member body 41 and the circuit breaker housing 2 respectively, so that the second locking member protrusion 40 protrudes through the second opening 204 On the outside of the circuit breaker housing 2; after the small circuit breaker is assembled to the circuit breaker assembly position, the second locking member protrusion 40 passes through the second opening 204 and cooperates with the housing limit of the circuit breaker assembly position. The locking mechanism, after the small circuit breaker of the present invention is installed in the circuit breaker assembly position, the second locking member protrusion 40 cooperates with the housing limit of the circuit breaker assembly position to prevent the small circuit breaker of the present invention from being accidentally pulled out, ensuring that The stable and reliable operation of the circuit breaker also prevents users from accidentally pulling out the circuit breaker and causing electric shock when the circuit breaker is closed, which is conducive to improving the safety of electricity use.

Preferably, the circuit breaker assembly location may be an installation cabinet for installing the circuit breaker.

Preferably, as shown in Figures 3 and 5, the button mechanism 1 includes a button head 10, a button body 11 and a first connecting rod 1050. The button head 10 is provided at one end of the button body 11 and protrudes outside the circuit breaker housing 2. In order to facilitate the user to operate the button mechanism 1, one end of the first link 1050 is inserted into the other end of the button body 11, one end of the first locking member 3 is locked and matched with one end of the first link 1050 inserted into the button body 11, and the second The locking piece 4 is drivingly engaged with one end of the first link 1050 that is inserted into the button body 11 . The first link 1050 not only serves as a transmission element between the button mechanism 1 and the operating mechanism 5, but also cooperates with the first locking piece 3 and the second locking piece 4 respectively, which is conducive to simplifying the structure of the button mechanism 1 and saving costs. Production costs of inventing the miniature circuit breaker.

Preferably, the first locking part main body 31 of the first locking part 3 and the second locking part main body 41 of the second locking part 4 are both pivotally arranged on the circuit breaker housing 2 through the first pivot 3040, which is beneficial to The assembly structure of the anti-closing mechanism and the locking mechanism is simplified, thereby saving the assembly space inside the circuit breaker housing 2, which is beneficial to the miniaturization of the small circuit breaker of the present invention.

Preferably, the first locking spring and the second locking spring are double torsion springs 3042 with an integrated structure, which include a first end of a double torsion spring, a second end of a double torsion spring and a third end of a double torsion spring. The double torsion spring The first end is connected to the first locking piece body 31 , the second end of the double torsion spring is connected to the second locking piece body 41 , and the third end of the double torsion spring is connected to the circuit breaker housing 2 . The double torsion spring 3042 can be connected to the first locking part 3, the second locking part 4 and the circuit breaker housing 2 at the same time, which is conducive to further simplifying the assembly structure of the anti-closing mechanism and the locking mechanism, simplifying the assembly operation, and improving assembly efficiency. .

Preferably, as shown in Figures 1 and 8, the operating mechanism 5 includes a locking member 53, a supporting member 54 and a jumping member 55. The supporting members 54 are respectively pivoted on the circuit breaker housing 2, and the locking member 53 and the jumper fastener 55 are respectively pivoted on the support member 54, the button mechanism 1 is drivingly connected to the operating mechanism 5, the locking member 53 and the jumper fastener 55 are locked and matched, and the jumper fastener 55 is driven and matched with the support member 54, The support piece 54 is connected to the movable contact 56, and the support piece 54 is connected to the movable contact 56;

The small circuit breaker of the present invention also includes an opening rod 15. The opening rod 15 includes a connecting end of the opening rod and a driving end of the opening rod. The connecting end of the opening rod is connected to the button mechanism 1. The driving end of the opening rod is connected to the trip fastener. 55 drives and cooperates; when the small circuit breaker is in the open state, the locking part 53 and the tripping part 55 lock and cooperate, pressing the button mechanism 1 drives the operating mechanism 5 to act, and the operating mechanism 5 drives the moving contact 56 and the static contact 560 is closed, the small circuit breaker enters the closing state, and at the same time, the opening lever 15 is slid to a position that matches the tripping fastener 55; press the button mechanism 1 again, and the driving end of the opening rod drives the tripping fastener 55 to rotate, causing the tripping fastener 55 to rotate. 55 and the locking member 53 release the locking cooperation, the operating mechanism 5 is tripped, the supporting member 54 drives the moving contact 56 and the static contact 560 to disconnect, the small circuit breaker enters the opening state, and the opening lever 15 is reset to the initial position. .

It should be pointed out that the locking cooperation between the locking part 53 and the jumping fastener 55 means that one end of the locking part 53 overlaps the jumping fastener 55 and limits the action of the jumping fastener 55. Once When the overlapping relationship between the locking member 53 and the jumper member 55 is destroyed, the movement of the jumper member 55 is no longer restricted by the locking member 53 .

Existing small circuit breakers use a pull button to open the circuit breaker. However, this pull method often pulls the circuit breaker out of the cabinet due to excessive user force. The assembly stability of the circuit breaker is poor, which affects the user's safety. Use experience.

The small circuit breaker of the present invention can realize the opening/closing of the circuit breaker by pressing the button mechanism 1. Compared with the prior art method of using a pulling button mechanism to realize the opening operation of the circuit breaker, it can avoid pulling the button. When the circuit breaker is installed, the circuit breaker may be pulled out of the cabinet due to excessive user force. This will help improve the assembly stability of the circuit breaker and improve the user experience.

It should be pointed out that the small circuit breaker of the present invention can also realize the opening operation by pulling the button mechanism 1 when the small circuit breaker is in the closing state. The opening rod 15 can be pulled without affecting the button mechanism 1 being pulled out. Furthermore, the small circuit breaker of the present invention may not be provided with the opening lever 15, but may be opened by pulling the button mechanism 1 and driving the operating mechanism 5 through the first link 1050 to rotate past the dead center, thereby causing the movable contact to open. 56 is disconnected from the static contact 560.

Preferably, the small circuit breaker of the present invention also includes an indicating device. The circuit breaker housing 2 includes an indicating hole provided on one side thereof. The button mechanism 1 is in sliding cooperation with the circuit breaker housing 2. The indicating device is driven in cooperation with the button mechanism 1. When the button mechanism 1 is pressed to close the small circuit breaker, the button mechanism 1 drives the indicating device to block the indicating hole. The indicator device of the small circuit breaker of the present invention can block the indicator hole when the circuit breaker is closed to indicate the closing state of the circuit breaker, thereby serving as a warning to the user and reminding the user not to remove or connect the small circuit breaker. operation, significantly improving the safety of electricity use.

Preferably, as shown in Figures 12 and 14, the circuit breaker housing 2 includes at least one wire insertion hole 208 and at least one wire removal hole 201 provided on one side thereof. The wire insertion hole 208 and the wire removal hole 201 are used in conjunction. , the button mechanism 1, the wire removal hole 201, and the wire insertion hole 208 are located at the same end of the circuit breaker housing 2; the small circuit breaker of the present invention also includes an indicating device, and the indicating device includes at least one baffle and a linkage piece 7a, and the linkage piece 7a is in the middle Pivotally installed on the circuit breaker housing 2, one end of the linkage 7a is drivingly connected to the button mechanism 1, and the other end is driven and matched with the baffle; pressing the button mechanism 1 closes the small circuit breaker, and the button mechanism 1 drives the block through the linkage 7a The plate moves to the stitch removal hole 201 and blocks the stitch removal hole 201 . Further, the baffle is in sliding fit with the circuit breaker housing 2 .

Preferably, the middle part of the linkage part 7a is pivoted on the circuit breaker housing 2. The linkage part 7a includes a linkage driven arm 71a and a linkage driving arm 70a. The linkage driven arm 71a is provided with a linkage driven arm in the middle part. Slot 73a, the linkage driving arm 70a is provided with a linkage driving column 72a; the end of the baffle that drives and cooperates with the linkage 7a is provided with a baffle passive end slot; the button mechanism 1 includes a button driving column, The button driving column is drivingly connected to the slot 73a of the linkage driven arm, and the linkage driving column 72a is drivingly connected to the slotting 73a of the driven end of the baffle.

Preferably, the baffle is in sliding fit with the circuit breaker housing 2 .

Preferably, the stitch removal hole 201 is an indicator hole.

In existing small circuit breakers, when the circuit breaker is closed and powered on, the wire removal hole is exposed, and the circuit inside the circuit breaker housing can still be contacted through the wire removal hole. Misoperation of the wire removal hole by the user is very likely to cause electric shock to the user. , there are great safety risks.

The baffle of the miniature circuit breaker of the present invention can move to the wire removal hole and cover the wire removal hole when the circuit breaker is closed, which can serve as a warning to the user and remind the user not to operate the wire removal hole. Secondly, the baffle covers the wire removal hole and prevents the user from operating the wire removal hole, thereby significantly improving the safety of electricity use.

Preferably, as shown in Figures 18 and 20, the circuit breaker housing 2 has a rectangular parallelepiped structure. The circuit breaker housing 2 includes a front end face and a rear end face that are opposite to each other, a left side and a right side that are opposite to each other, and an opposite side. The upper and lower surfaces are provided; the rear end surface is provided with a cable entry hole 21a, the front end surface is provided with an operating component mounting hole 1020 and a plug-in hole 208, and a plug-type plug-in hole 21a is provided in the cable entry hole 21a. Terminals. In the small circuit breaker of the present invention, the front end face and the rear end face of the circuit breaker housing 2 are respectively provided with wire insertion holes and wire inlet holes. External conductors can be directly plugged and matched with or pulled out of the plug-in type terminals in the wire inlet holes. When installing and replacing the circuit breaker, it does not require much space for disassembly and assembly, and is easy to disassemble and assemble.

As shown in Figure 1, it is a best embodiment of the small circuit breaker of the present invention.

As shown in Figure 1, the small circuit breaker of the present invention includes a circuit breaker housing 2, a button mechanism 1, an anti-closing mechanism, a locking mechanism, an operating mechanism 5, a short-circuit protection mechanism 6, an arc extinguishing mechanism 7, and incoming wires. Terminal 8, overload protection mechanism 9, movable contact 56, static contact 560 and outlet terminal 100; the button mechanism 1 is inserted into the upper end of the circuit breaker housing 2 and slides with the circuit breaker housing 2, and the outlet terminal 100 is set At the upper end of the circuit breaker housing 2 and on the left side of the button mechanism 1, the short-circuit protection mechanism 6, the arc extinguishing mechanism 7 and the incoming line terminal 8 are arranged at the lower end of the circuit breaker housing 2. The short-circuit protection mechanism 6 and the arc extinguishing mechanism 7 are arranged at the inlet terminal. On the upper side of the line end 8, the arc extinguishing mechanism 7 and the short-circuit protection mechanism 6 are arranged side by side. The operating mechanism 5 and the overload protection mechanism 9 are arranged in the middle of the circuit breaker housing 2. The operating mechanism 5 is located between the short-circuit protection mechanism 6 and the button mechanism 1. , the overload protection mechanism 9 is located between the arc extinguishing mechanism 7 and the outlet end 100; the button mechanism 1 is drivingly connected to the operating mechanism 5 through the first link 1050, and the operating mechanism 5 is connected to the movable contact 56. The overload protection mechanism 9 Connected to the static contact 560 , the arc extinguishing mechanism 7 is used in conjunction with the movable contact 56 and the static contact 560 . The short-circuit protection mechanism 6 and the overload protection mechanism 9 are driven and coordinated with the operating mechanism 5 respectively.

Preferably, as shown in Figure 1, the overload protection mechanism 9 includes a bimetallic piece and an adjusting screw. The upper end of the bimetallic piece is driven and matched with the jumper 55 of the operating mechanism 5, and the lower end is fixedly mounted on the circuit breaker housing 2. The adjusting screw is arranged on the left side of the lower end of the bimetal piece. The position of the bimetal piece of the overload protection mechanism can be adjusted by turning the adjusting screw, thereby adjusting the overload current protection range of the small circuit breaker of the present invention.

As shown in Figures 4 and 5, the anti-closing mechanism includes a first locking member 3. The first locking member 3 includes a first locking member body 31 and first locking member protrusions respectively provided at both ends of the first locking member body 31. 30 and the first locking member retaining arm 32. As shown in Figure 4, the first locking part 3 is pivoted through the first pivot 3040 at the upper right corner of the circuit breaker housing 2 and is located on the right side of the button mechanism 1. There is a The double torsion spring 3042, the first end of the double torsion spring and the third end of the double torsion spring of the double torsion spring 3042 are respectively connected to the first locking member body 31 of the first locking member 3 and the circuit breaker housing 2, so that the first locking member The protrusion 30 passes through the first opening 203 of the circuit breaker housing 2 and protrudes outside the circuit breaker housing 2 . As shown in Figure 5, the button mechanism 1 includes a button head 10, a button body 11 and a first link 1050. The button head 10 is provided at one end of the button body 11 and protrudes outside the circuit breaker housing 2 to facilitate user operation. One end of the button head 10 and the first connecting rod 1050 is inserted into the other end of the button body 11 and forms a first transmission rod 3041. The first locking member retaining arm 32 is locked and matched with the first transmission rod 3041. Specifically, as shown in FIG. 5 , the button head 10 is connected to the left end of the button body 11 , the first transmission rod 3041 is provided at the right end of the button body 11 , and the first locking member blocking arm 32 is provided at the first transmission rod 3041 On the right side, when the button mechanism 1 is pressed, the first locking member blocking arm 32 prevents the button mechanism 1 from moving to the right, that is, it prevents the button mechanism 1 from moving in the closing direction. When the small circuit breaker of the present invention is assembled to the circuit breaker After the assembly position is in place, the housing in the assembly position of the circuit breaker squeezes the first locking member protrusion 30, causing the first locking member protrusion 30 to move toward the inside of the circuit breaker housing 2, and the first locking member retaining arm 32 is tilted. , the first transmission rod 3041 is no longer blocked. At this time, pressing the button mechanism 1 can close the circuit breaker.

Preferably, as shown in Figure 5, the first locking member 3 includes a first locking spring limiting protrusion 33 provided on one side of the first locking member body 31. The first locking spring limiting protrusion 33 and the double twist The first end of the double torsion spring of spring 3042 is limited to fit. Specifically, as shown in Figure 5, the first locking spring limiting protrusion 33 is disposed on the rear side of the left end of the first locking member body 31, and the first end of the double torsion spring is located on the first locking spring limiting protrusion 33. The front side cooperates with its limit.

Preferably, as shown in Figure 5, the button mechanism 1 includes a transmission rod mounting platform 12. The first connecting rod 1050 is a U-shaped rod. One end of the first connecting rod 1050 is inserted into the transmission rod mounting platform 12 and forms a figure. On the first transmission rod 3041 on one side of the mounting platform 12, the first locking member blocking arm 32 of the first locking member 3 is located on one side of the transmission rod mounting platform 12 and locks with the first transmission rod 3041. The first locking member blocking arm 32 blocks the first transmission rod 3041 from moving in the closing direction. Specifically, as shown in FIG. 5 , the transmission rod mounting platform 12 is disposed on the upper right end of the button body 11 , and the left end of the first connecting rod 1050 is inserted into the transmission rod mounting platform 12 and forms a protrusion on the transmission rod mounting platform. The first transmission rod 3041 on the front side of the platform 12, the first locking member retaining arm 32 is located on the right side of the first transmission rod 3041 and locks with it. Further, as shown in Figure 5, the button mechanism 1 also includes a first limiting boss 13. The first limiting boss 13 is spaced apart from the transmission rod mounting platform 12 and is located on the front side thereof. The boss 13 is in contact with the circuit breaker housing 2 so that the button mechanism 1 remains stable when sliding in the circuit breaker housing 2 to avoid shaking. Preferably, as shown in Figure 5, the button mechanism 1 also includes a button protrusion 14. The button protrusion 14 is disposed on the upper side of the button body 11 and is located on the front side of the transmission rod mounting platform 12. The rear end of the button protrusion 14 is Connected to the front end of the transmission rod mounting platform 12.

As shown in Figures 2 and 3, the locking mechanism includes a second locking piece 4. The second locking piece 4 includes a second locking piece body 41 and second locking piece protrusions 40 respectively provided at both ends of the second locking piece body 41. , the second locking member driving arm 42. As shown in FIG. 2 , the locking mechanism is arranged at the upper right corner of the circuit breaker housing 2 and is located on the right side of the button mechanism 1 . The second locking member body 41 of the second locking member 4 pivots through the first pivot 3040 . Rotate and install on the circuit breaker housing 2. As shown in FIG. 3 , the second locking member driving arm 42 of the second locking member 4 is drivingly engaged with the first transmission rod 3041 of the first connecting rod 1050 . Specifically, in the direction shown in Figure 3, the second locking member driving arm 42 is arranged on the left side of the first transmission rod 3041. The small circuit breaker of the present invention is assembled to the circuit breaker assembly position and is installed in place. After the circuit breaker is assembled, The position of the housing and the second locking member body 41 are limited and matched, so that the circuit breaker and the circuit breaker assembly position are reliably limited and assembled. When the button mechanism 1 is pulled toward the outside of the circuit breaker housing 2, the button mechanism is pulled to the left. 1. The first transmission rod 3041 drives the second locking member driving arm 42 to tilt the second locking member driving arm 42, and the second locking member protrusion 40 sinks and moves toward the inside of the circuit breaker housing 2, thereby causing the second locking member 42 to tilt. The limited cooperation between the component protrusion 20 and the circuit breaker assembly position is released, and the user can disassemble the circuit breaker from the circuit breaker assembly position.

Preferably, as shown in Figure 3, the second locking member 4 includes a second locking spring limiting protrusion 43 provided on one side of the second locking member body 41, and the second end of the double torsion spring 3042 is connected to the second end of the double torsion spring 3042. The second locking spring limiting protrusion 43 is limited to fit. Specifically, as shown in Figure 3, the second locking spring limiting protrusion 43 is provided on the rear side of the left end of the second locking member body 41, and the second end of the double torsion spring is provided on the second locking spring limiting protrusion 43. The front side cooperates with its limit.

Preferably, in the direction shown in Figure 5, the double torsion spring 3042 is installed on the circuit breaker housing 2 through the third installation shaft 3043. The double torsion spring 3042 includes a first end of a double torsion spring, a second end of a double torsion spring and The third end of the double torsion spring, the first end of the double torsion spring and the second end of the double torsion spring are arranged above the button body 11 and are basically parallel to the button body 11. The third end of the double torsion spring is arranged above the button body 11 and is basically perpendicular to it. The third end of the torsion spring also cooperates with the button protrusion 14 of the button mechanism 1. The third end of the double torsion spring blocks the button protrusion 14 in the opening direction of the button mechanism 1, thereby limiting the position of the button mechanism 1 in the opening direction. Specifically, as shown in FIG. 2 , the first installation shaft 3043 is installed at the upper right corner of the circuit breaker housing 2 .

Preferably, as shown in FIG. 2 , the circuit breaker housing 2 further includes a third locking spring limiting protrusion 210 , and the third locking spring limiting protrusion 210 is connected to the third end of the double torsion spring. Specifically, as shown in FIG. 2 , the third locking spring limiting protrusion 210 is provided above the locking mechanism and the anti-closing mechanism, and is located on the left side of the first installation shaft 3043 .

Preferably, as shown in Figure 1, the button mechanism 1 is provided at one end of the circuit breaker housing 2 and is slidably matched with it. The two locking parts 4 and the double torsion spring 3042 are both provided on one side of the button mechanism 1. The first installation shaft 3043 is provided at an inner corner of the circuit breaker housing 2, and the third locking spring limit protrusion 210 is located on the first installation shaft 3043. Between the button mechanism 1 and the first locking member 3 and the second locking member 4, the first locking member 3 and the second locking member 4 are arranged side by side and located on one side of the third locking spring limiting protrusion 210. The first opening 203 is smaller than the second opening 204. Close to the first mounting shaft 3043, the first pivot 3040 is located between the first opening 203 and the first mounting shaft 3043. Specifically, as shown in Figure 1, the button mechanism 1 is arranged on the upper end of the circuit breaker housing 2 to slide with it. The anti-closing mechanism, the locking mechanism and the double torsion spring are all arranged on the right side of the button mechanism 1. The first installation The shaft 3043 is set at the upper right corner of the circuit breaker housing 2, the double torsion spring 3042 is set on the first installation shaft 3043, and the anti-closing mechanism and the locking mechanism are both pivoted on the circuit breaker housing through the first pivot 3040. 2 and located below the first installation shaft 3043, the first locking part 3 of the anti-closing mechanism and the second locking part 4 of the locking mechanism are arranged side by side, the second locking part 4 is located on the inside, and the first locking part 3 is located on the outside. The first opening 203 is located above the second opening 204 , and the third locking spring limiting protrusion 210 is provided on the left side of the first mounting shaft 3043 .

As shown in Figures 1, 6 and 8, the operating mechanism 5 includes a transmission member 51, a second link 52, a locking member 53, a support member 54, a jumping member 55 and a first return spring 57. The transmission member 51 passes through The second pivot 510 is pivoted on the circuit breaker housing 2 , the supporting member 54 is pivoted on the circuit breaker housing 2 through the third pivot 540 , and the locking member 53 is pivoted on the circuit breaker housing 2 through the fourth pivot 530 . On the supporting member 54 , the jumping fastener 55 is pivotally arranged on the supporting member 54 through the third pivot 540 . The button mechanism 1 is drivingly connected to the transmission member 51 through the first connecting rod 1050, and the driving member 51 is drivingly connected to the locking member 53 through the second connecting rod 52. The locking member 53 and the jumping member 55 are locked and matched, and the jumping member 53 is connected to the locking member 53 through the second connecting rod 52. The fastener 55 is driven and matched with the support member 54, and the support member 54 is connected to the movable contact 56.

It should be pointed out that in addition to using the first locking member 3 to lock and cooperate with the button mechanism 1 to prevent closing when the circuit breaker is not assembled in place, the anti-closing mechanism can also cooperate with the operating mechanism. 5 locking fit (not shown in the figure) to prevent the operating mechanism 5 from being operated and closing. Specifically, when the circuit breaker is not assembled in place, one end of the first locking member 3 of the anti-closing mechanism can resist and lock with the support member 54 of the operating mechanism 5. After the circuit breaker is assembled in place, the housing in the assembly position of the circuit breaker The first locking member 3 is triggered to rotate so that the first locking member 3 contacts and locks with the support member 54 of the operating mechanism 5. In this way, the button mechanism 1 can move in the closing direction and drive the operating mechanism 5 to perform the closing operation.

The operating mechanism 5 also includes an opening lever 15, a button mechanism reset member 10a, a guide boss 20 and a guide groove group. The opening rod 15 includes a connecting end of the opening rod and a driving end of the opening rod. The connecting end of the opening rod is connected to the button mechanism 1 , and the driving end of the opening rod is drivingly matched with the tripper 55 . The wire boss 20 is provided on the circuit breaker housing 2. As shown in Figures 7 and 9, the guide groove group includes a first guide groove 21, a second guide groove 22, a third guide groove 23, a fourth guide groove 23 and a fourth guide groove 22. The groove 24, the fifth guide groove 25, the first guide groove 21, the second guide groove 22, the third guide groove 23, the fourth guide groove 24 and the fifth guide groove 25 are connected end to end to form an annular guide surrounding the guide boss 20. slot group. When the small circuit breaker is in the opening state, press the button mechanism 1, and the opening rod driving end of the opening rod 15 passes through the first guide groove 21, through the second guide groove 22, and enters the third guide groove 23. The small circuit breaker Entering the closing state, release the button mechanism 1. Under the reaction force of the button mechanism reset member 10a, the button mechanism 1 drives the driving end of the opening lever to enter the fourth guide groove 24 from the third guide groove 23. At this time, the opening lever The front end of the driving end is aligned with the tripper 55, and the guide boss 20 blocks the opening lever 15 in the reset direction of the opening lever 15, preventing the opening lever 15 and the button mechanism 1 from being reset under the reaction force of the button mechanism reset part 10a; Press the button mechanism 1 again, causing the driving end of the opening lever to drive the tripper 55 to rotate. The tripper 55 and the locking part 53 release the locking fit, and the operating mechanism 5 jumps the button. The operating mechanism 5 drives the button mechanism 1 to reset, and the button mechanism 1 drives the driving end of the opening lever from the fourth guide groove 24, through the fifth guide groove 25, and into the first guide groove 21. The button mechanism 1 and the operating mechanism 5 both return to the initial state, making the small circuit breaker enter the opening state.

As shown in Figure 10, the movement trajectory of the opening rod driving end of the opening rod 15 is shown: the small circuit breaker of the present invention, from the opening state to the closing state, the broken line a-b-c-d basically describes the movement of the opening rod driving end. Movement trajectory: When the small circuit breaker of the present invention changes from the closing state to the opening state, the broken line d-e-a basically describes the movement trajectory of the driving end of the opening lever.

Preferably, as shown in Figure 7, the first guide groove 21 includes a first guide groove bottom surface, the second guide groove 22 includes a second guide groove bottom surface, the third guide groove 23 includes a third guide groove bottom surface, and the fourth guide groove 23 includes a third guide groove bottom surface. The groove 24 includes a fourth guide groove bottom surface, and the fifth guide groove 25 includes a fifth guide groove bottom surface; the second guide groove bottom surface is a slope, and one end of the second guide groove bottom surface connected to the first guide groove bottom surface is connected to the first guide groove bottom surface. The bottom surface of the groove is flush, the end of the bottom surface of the second guide groove connected to the third guide groove 23 is higher than the bottom surface of the first guide groove and higher than the bottom surface of the third guide groove, and the bottom surface of the fourth guide groove is lower than the bottom surface of the third guide groove. The bottom surface of the fifth guide groove is an inclined surface. The end of the bottom surface of the fifth guide groove connected to the bottom surface of the fourth guide groove is flush with the bottom surface of the fourth guide groove. The end of the bottom surface of the fifth guide groove connected to the first guide groove 21 is higher than the bottom surface of the fourth guide groove 21 . The bottom surface of the guide groove is higher than the bottom surface of the first guide groove.

Preferably, the connection between the bottom surface of the second guide groove and the bottom surface of the third guide groove is provided with a step structure, the connection between the bottom surface of the third guide groove and the bottom surface of the fourth guide groove is provided with a step structure, and the bottom surface of the fifth guide groove and the bottom surface of the fourth guide groove are provided with a step structure. A step structure is provided at the connection point of the bottom surface of the guide groove.

Preferably, the guide boss 20 is a boss with a triangular cross-section. Further, the cross section of the guide boss 20 is a right-angled triangle or an obtuse triangle, with the right angle or obtuse angle located at the connection between the fourth guide groove 24 and the fifth guide groove 25, and one acute angle thereof located at the connection between the second guide groove 22 and the fifth guide groove 22. The other acute angle of the connection of the three guide grooves 23 corresponds to the connection of the first guide groove 21 and the second guide groove 22, and one of its right-angled edges or an obtuse-angled edge is arranged on one side of the fourth guide groove 24 and is parallel to it. Another right-angled side or another obtuse-angled side is provided on one side of the fifth guide groove 25 and is parallel to it, and its hypotenuse or longest side is provided on one side of the second guide groove 22. The first guide groove 21 and the second guide groove 22 Located in a straight line, the third guide groove 23 is located on the lower side of the guide boss 20 .

It should be pointed out that in addition to the specific structure of the guide boss and the guide groove set of this embodiment, the opening lever can also adopt other matching structures. It only needs to cooperate with the button mechanism 1, and the button mechanism is pressed for the first time. The scoring gate lever can be moved to the second stable position that cooperates with the jumper fastener, and the button mechanism can be reset to the initial stable position by pressing the button for the second time, and can drive the jumper fastener, all of which belong to the protection scope of the present invention. For example, the button mechanism may be provided with a guide structure, and the circuit breaker housing 2 may be provided with a guide rod that cooperates with the guide structure.

Preferably, as shown in Figures 1, 2, 4, 6 and 8, the transmission member 51 includes a first transmission member connection hole and a second transmission member connection hole provided thereon, and the first transmission member connection hole is connected to the second transmission member connection hole. A connecting rod 1050 is connected, and the inner diameter of the first transmission member connecting hole is larger than the outer diameter of the first connecting rod 1050, so that when the small circuit breaker of the present invention is in the closing state, the button mechanism 1 has a certain position relative to the transmission member 51 The degree of freedom of movement is that the second transmission member connecting hole is connected to the second connecting rod 52 .

Preferably, as shown in Figure 8, the jump fastener 55 includes a first jump fastener arm 550 and a jump fastener second arm 551. The free end of the jump fastener first arm 550 is locked with the locking member 53. , the second arm 551 of the trip fastener is driven and matched with the driving end of the opening lever 15 , and the second arm 551 of the trip fastener is also driven and matched with the overload protection mechanism 9 . Further, the tripper 55 also includes a tripper extension 553. One end of the tripper extension 553 is connected to the second arm 551 of the tripper, and the other end is connected to the opening lever driving end of the trip lever 15. In driving cooperation, the jumping fastener extending arm 553 also drives in cooperation with the overload protection mechanism 9 .

Preferably, as shown in Figure 8, the jump fastener 55 is roughly a "Z"-shaped structure, which includes a first jump fastener arm 550, a second jump fastener arm 551, a third jump fastener arm 552, and a jump fastener third arm 552. The fastener extension part 553 and the third arm 552 of the fastener are driven and matched with the short circuit protection mechanism 6 . Specifically, as shown in FIG. 8 , the jump fastener 55 is roughly a "Z"-shaped structure, the middle of which is pivotally installed on the support member 54 through the third pivot 540 , and the second arm 551 and the jump fastener are The third arm 552 of the fastener is basically in a straight line, and the first arm 550 of the jump fastener is located between the second arm 551 of the jump fastener and the third arm 552 of the jump fastener, roughly perpendicular to the straight line between the two. The width of the end of the extending portion 553 that matches the driving end of the opening rod is greater than or equal to the width of the fourth guide groove 24 of the guide groove group to ensure reliable cooperation between the driving end of the opening rod and the extending portion 553 of the tripper.

Preferably, as shown in Figure 8, the button mechanism reset member 10a is an elastic metal piece, with one end fixedly connected to the circuit breaker housing 2 and located on one side of the transmission member 51, and the other end extending toward the button mechanism 1, and Driven and matched with the button mechanism 1; when the small circuit breaker is in the open state, the button mechanism 1 is separated from the button mechanism reset member 10a; when the small circuit breaker is in the closed state, the button mechanism 1 is in contact with the button mechanism reset member 10a, and the button The mechanism reset member 10a provides the button mechanism 1 with a reaction force in the reset direction. It should be pointed out that when the small circuit breaker is in the open state, the button mechanism 1 may also be in contact with the button mechanism reset member 10a.

Preferably, the button mechanism reset member 10a is specifically a torsion spring or a bent metal rod/piece, one end of which is fixed on the circuit breaker housing 2, and the other end cooperates with the button mechanism 1. It can be understood that in other embodiments, the button mechanism reset member 10a can also be a compression spring disposed between the circuit breaker housing 2 and the button mechanism 1 to provide a reaction force for the button mechanism 1.

As shown in Figures 11-13, the circuit breaker housing 2 includes two wire insertion holes 208 and two wire removal holes 201 provided on one side of the circuit breaker housing 2. The two wire removal holes 201 are respectively connected with the two wire insertion holes 208. Correspondingly, a wire removal hole 201 and a wire insertion hole 208 form a group. The wire insertion hole 208 and the wire removal hole 201 of each group are set corresponding to a wire outlet 100. External wires can pass through the wire insertion hole 208 and the wire insertion hole 208. The outlet terminal 100 is connected, and the user can operate the outlet terminal 100 through the wire removal hole 201 to pull out the external wire from the wire insertion hole 208 .

As shown in Figures 13-15, the miniature circuit breaker of the present invention also includes an indicating device. The indicating device includes a first baffle 5a, a second baffle 6a, a linkage 7a and a second transmission rod 8a. The first baffle 5a and The second baffle 6a corresponds to the two wire removal holes 201 respectively. One end of the first baffle 5a is drivingly connected to the linkage member 7a, and the other end is drivingly connected to one end of the second transmission rod 8a. The other end of the second transmission rod 8a is connected to the third transmission rod 8a. The two baffles 6a are driven and connected, and the middle part of the second transmission rod 8a is pivoted on the circuit breaker housing 2; pressing the button mechanism 1 closes the small circuit breaker, and the button mechanism 1 drives the first baffle 5a to move through the linkage 7a The first baffle 5a drives the second baffle 6a to move to another wire removal hole 201 and blocks the wire removal hole 201 through the second transmission rod 8a. Specifically, as shown in Figures 11 and 12, the wire insertion hole 208 close to the button mechanism 1 is the first wire insertion hole, and the wire insertion hole 208 far away from the button mechanism 1 is the second wire insertion hole, which is different from the first wire insertion hole. The matched wire removal hole 201 is the first wire removal hole, and the wire removal hole 201 that cooperates with the second wire insertion hole is the second wire removal hole; the first baffle 5a cooperates with the second wire removal hole, and the second blocker 5a cooperates with the second wire removal hole. The plate 6a cooperates with the first wire removal hole, the middle part of the second transmission rod 8a is pivoted on the circuit breaker housing 2, press the button mechanism 1, the button mechanism 1 drives the linkage 7a to rotate, and the linkage 7a drives the first baffle 5a The first baffle 5a drives the second transmission rod 8a to rotate, and the second transmission rod 8a drives the second baffle 6a to move toward the first wire removal hole and block the first suture removal hole. Wire removal holes.

Preferably, the first baffle 5a is disposed between the second wire removal hole and one wire outlet end 100, and the second baffle 6a is disposed between the second wire removal hole and the other wire outlet hole 100. Further, the two outlet terminals 100 are respectively arranged corresponding to the two poles of the small circuit breaker of the present invention.

As shown in Figures 11-13, the circuit breaker housing 2 also includes a first sliding cavity 27 and a second sliding cavity 26. The first sliding cavity 27 is provided on one side of a wiring hole 208 and close to the button mechanism 1. A baffle 5a is slidably disposed in the first sliding cavity 27, a second sliding cavity 26 is disposed on one side of the other plug hole 208 and away from the button mechanism 1, and a second baffle 6a is slidably disposed in the second sliding cavity 26. The first sliding chamber 27 communicates with the second sliding chamber 26. The second transmission rod 8 is rotatably disposed at the connection between the first sliding chamber 27 and the second sliding chamber 26, and both ends of the second transmission rod 8a are respectively located on the first sliding chamber 27. In the cavity 27 and the second sliding cavity 26, the two ends of the second transmission rod 8a are drivingly connected to the first baffle 5a and the second baffle 6a respectively. Specifically, as shown in Figures 11-13, the first sliding cavity 27 is arranged on the side of the second stitch removal hole and close to the button mechanism 1, and the second sliding cavity 26 is arranged on the side of the first stitch removal hole and away from the button. Mechanism 1, the first sliding chamber 27 and the second sliding chamber 26 are connected, the second transmission rod 8a is rotatably arranged at the communication between the first sliding chamber 27 and the second sliding chamber 26, and the second transmission rod 8a is located in the first wire insertion hole. and the second wire insertion hole, the first baffle 5a is slidably disposed in the first sliding cavity 27, one end of the first baffle 5a is drivingly connected to the linkage member 7a, and the other end is drivingly connected to one end of the second transmission rod 8a. The other end of the second transmission rod 8a is drivingly connected to the second baffle 6a. The second baffle 6a is slidably disposed in the second sliding cavity 26. There is a thread matching the first wire insertion hole and the first wire removal hole below. A wire outlet terminal 100 is provided below the second wire insertion hole and the second wire removal hole to cooperate with the two wire outlet terminals 100. The first baffle 5a is provided at the first wire removal hole and the first wire removal hole corresponding to the first wire removal hole. Between the wire outlets 100, the second baffle 6a is provided between the second wire removal hole and the wire outlet end 100 corresponding to the second wire removal hole.

As shown in Figures 14 and 15, the first baffle 5a includes a first baffle driven end 52a, a first baffle connecting arm 51a and a first baffle main body 50a. The two ends of the first baffle connecting arm 51a are respectively Connected to the first baffle driven end 52a and the first baffle main body 50a, a first baffle driven end slot 53a is provided on one side of the first baffle driven end 52a, and the first baffle driven end slot 53a Drivenly connected to the linkage 7a, a first baffle body slot 54a is provided on the lower side of the first baffle body 50a; the second baffle 6a includes a second baffle body 60a and a second baffle body disposed on the lower side of the second baffle body 60a. The second baffle body is slotted 61a; the second transmission rod 8a includes a second transmission rod trunk 80a, a second transmission rod driven end 82a and a second transmission rod driving end 81a, and the second transmission rod trunk 80a pivots Disposed on the circuit breaker housing 2, the driven end 82a of the second transmission rod is drivingly connected to the slot 54a of the first baffle body, and the driving end 80a of the second transmission rod is drivingly connected to the slot 61a of the second baffle body.

Preferably, the second transmission rod driven end 82a and the second transmission rod driving end 81a are both cylindrical structures, and both are vertically connected to the second transmission rod trunk 80a.

Preferably, the first baffle driven end 52a and the first baffle main body 50a are vertically connected to the first baffle connecting arm 51a respectively. Furthermore, the extending direction of the slot 53a at the driven end of the first baffle is perpendicular to the extending direction of the first baffle connecting arm 51a, and the extending direction of the slot 54a of the first baffle body is perpendicular to the extending direction of the first baffle connecting arm 51a. The extending direction of the first baffle driven end slot 53a is perpendicular to the extending direction of the first baffle main body slot 54a. Specifically, as shown in Figure 15, the first baffle driven end slot 53a extends in the vertical direction, the first baffle main body slot 54a extends in the horizontal direction, and the first baffle driven end slot 53a extends in the vertical direction. The extending direction of 53a is perpendicular to the extending direction of the groove 54a of the first baffle body.

Preferably, a second transmission rod pivot 83a is provided in the middle of the second transmission rod trunk 80a, and a second transmission rod pivot hole is provided at the connection between the first sliding chamber 27 and the second sliding chamber 26 of the circuit breaker housing 2. 28. The second transmission rod pivot 83a is rotatably arranged in the second transmission rod pivot hole 28.

As shown in Figures 14 and 15, it is an embodiment of the linkage 7a of the present invention.

The linkage member 7a has a V-shaped structure, the middle part of which is pivoted on the circuit breaker housing 2a. The linkage member 7a includes a linkage member driven arm 71a and a linkage member driving arm 70a. The linkage member driven arm 71a is provided with a linkage member in the middle. The driven arm has a slot 73a, and the linkage driving arm 70a is provided with a linkage driving column 72a; the button assembly 1 includes a button driving column, and the button driving column is drivingly connected to the linkage driven arm slot 73a, and the linkage driving column 72a is drivingly connected to the first baffle driven end slot 53a.

It should be pointed out that, as shown in Figures 14 and 15, the button mechanism 1 may not be provided with a separate button driving column, but the first link 1050 passes through the transmission rod mounting platform 12 of the button mechanism 1 and is driven by the linkage 7a connected. The above connection method is conducive to simplifying the structure of the button mechanism 1, thereby reducing production costs.

As shown in Figure 12, when the button mechanism 1 is pressed, the button mechanism 1 causes the linkage 7a to rotate clockwise through the button driving column or the first link 1050. When the button mechanism 1 is reset, the button mechanism 1 rotates through the button driving column or the first link 1050. The rod 1050 drives the linkage 7a to rotate counterclockwise to return to the initial state of 7a.

As shown in Figures 16 and 17, it is another embodiment of the linkage 7a of the present invention.

The linkage 7a is a V-shaped mechanism, the middle part of which is pivoted on the circuit breaker housing 2a. The linkage 7a includes a linkage driven arm 71a and a linkage driving arm 70a. The linkage driven arm 71a and the button mechanism 1 The button driving column is in contact with or connected with one end of the first link 1050. The linkage driving arm 70a is provided with a linkage driving column 72a. The linkage driving column 72a is drivingly connected with the first baffle driven end slot 53a. . Specifically, one end of the button driving column or the first link 1050 is disposed on the upper side of the linkage driven arm 71a and is drivingly connected with the driven arm 71a.

The indicating device further includes an indicating device reset part 9a, and the indicating device is reset under the action of the indicating device reset part 9a, thereby avoiding the thread removal hole 201. Preferably, the indicating device return member 9a is a return spring, one end of which is connected to the circuit breaker housing 2, and the other end is connected to the linkage passive arm 71a of the linkage member 7a or the first baffle 5a.

As shown in Figures 16 and 17, when the button mechanism 1 is pressed, the button mechanism 1 causes the linkage 7a to rotate clockwise through the button driving column or the first link 1050. When the button mechanism 1 is reset, the return spring rotates the linkage 7a counterclockwise. Rotate to return to the initial state of linkage 7a.

It should be pointed out that an indication hole (not shown in the figure) can also be provided separately on one side of the circuit breaker housing 2, so that the indication device cooperates with the indication hole to indicate the closing or opening state of the circuit breaker. The indication device In conjunction with the button mechanism, when the button mechanism is pressed to close the small circuit breaker, the indicating device moves to the indicating hole and blocks the indicating hole. After the button mechanism is reset, the indicating device leaves the indicating hole. In this embodiment, the wire removal hole 201 is used as an indicator hole, so that the wire removal hole can be effectively utilized, and the indicator device can be used to block the wire removal hole to prevent the wire removal hole from being operated when the circuit breaker is closed.

As shown in Figure 2, the outlet end 100 includes a conductive plate 102 and an elastic member 101. The conductive plate 102 is fixedly provided on the circuit breaker housing 2. The elastic member 101 includes an elastic member fixed end 1011 and an elastic member pressing end 1010. The fixed end 1011 of the elastic member is fixedly arranged on the circuit breaker housing 2, the wire pressing end 1010 of the elastic member is in elastic contact with the conductive plate 102, and the wire pressing end 1010 of the elastic member is correspondingly provided with a set of wire insertion holes 208 and wire removal holes 201. The external wire passes through the wire insertion hole 208 and is inserted between the wire-pressing end 1010 of the elastic member and the conductive plate 2. The reset force of the wire-pressing end 1010 of the elastic member compresses the external wire between the wire-pressing end 1010 of the elastic member and the conductive plate 102. By applying pressure to the wire-pressing end 1010 of the elastic member through the wire-removal end 201, the wire-pressing end of the elastic member is separated from the external wire, and the external wire can be pulled out from the wire insertion hole 208. Preferably, as shown in Figure 2, the circuit breaker housing 2 also includes an elastic member fixing post 105 disposed thereon, and an arc-shaped elastic member installation groove is formed between the elastic member fixing post 105 and the circuit breaker housing 2. , the elastic member fixed end 1011 is connected to the elastic member pressing end 1010 through an arc-shaped bending structure 1012, and the arc-shaped bending structure 1012 is arranged in the elastic member installation groove. Further, as shown in Figures 12 and 13, the upper end of the conductive plate 102 is provided with an elastic member limiting protrusion, and the elastic member limiting protrusion cooperates with the elastic member pressing end 1010 for limiting. Specifically, as shown in Figures 1 and 2, an outlet terminal wiring cavity is provided on the left side of the button mechanism 1. A wire insertion hole 208 and a wire removal hole 201 are provided at the upper end of the outlet terminal wiring cavity. The conductive plate 102 is fixedly provided on At the lower right corner of the outlet terminal wiring cavity, the elastic member fixing post 105 is set at the upper left corner of the outlet terminal wiring cavity. An arc-shaped elastic member installation groove is formed between the elastic member fixation post 105 and the circuit breaker housing 2. The elastic member 101 The arc-shaped bending structure 1012 is arranged in the elastic member installation groove. The lower end of the elastic member fixed end 1011 is in elastic contact with the circuit breaker housing 2. The right end of the elastic member pressing end 1010 is in elastic contact with the conductive plate 102 and is in elastic contact with the elastic member limiting protrusion. Match the starting limit.

As shown in Figures 18 and 20, it is an embodiment of the circuit breaker housing 2 of the present invention.

As shown in Figure 18, the circuit breaker housing 2 of the present invention has a roughly rectangular parallelepiped structure. The circuit breaker housing 2 includes a front end face and a rear end face that are oppositely arranged, a left side and a right side that are oppositely arranged, and an opposite side. On the upper and lower surfaces provided, the circuit breaker housing 2 includes a wire insertion hole 208, a wire removal hole 201, an operating component mounting hole 1020, a first opening 203, a second opening 204, a wire entry hole 21a and a signal wire. The connection hole 22a and the operating part mounting hole 1020 are provided at the upper end of the front end surface of the circuit breaker housing 2 for installing the operating part. Two wire insertion holes 208 and two wire removal holes 201 are provided at the front end surface of the circuit breaker housing 2. Located below the operating part installation hole 1020, the left wire insertion hole 208 and the left wire removal hole 201 form a group and are used in conjunction with a wire outlet 100. The right wire insertion hole 208 and the right wire removal hole 201 As a group, it is used in conjunction with another outlet terminal 100. The first opening 203 is used in conjunction with the first locking member 3 of the anti-closing mechanism to allow the first locking member protrusion 30 of the first locking member 3 to pass through. The first opening 203 protrudes from the upper side of the circuit breaker housing 2, and the second opening 204 is used in conjunction with the second locking member 4 of the locking mechanism to allow the second locking member protrusion 40 of the second locking member 4 to pass through. The second opening 204 protrudes on the upper side of the circuit breaker housing 2 and cooperates with the housing limit at the circuit breaker assembly position. Two cable inlet holes 21a are respectively provided on the rear end surface of the circuit breaker housing 2. The wire holes 21a are spaced up and down, respectively located at the upper and lower ends of the rear end surface, and the signal wire connection holes 22a are arranged between the two wire inlet holes 21a; the wire inlet holes 21a are provided with plug-in terminals, specifically: Inlet terminal 8 is used to facilitate plugging and mating with external wires when the circuit breaker is assembled to the circuit breaker assembly position. It should be pointed out that the wire inlet terminal 8 can also be located on the front end surface side, and the wire outlet terminal 100 is provided on the rear end surface side.

It should be pointed out that a one-pole circuit breaker corresponds to one incoming terminal and one outgoing terminal. In this embodiment, there is a two-pole circuit breaker, including an L-pole circuit breaker and an N-pole circuit breaker. The N-pole circuit breaker has no moving contacts and static contacts. The head uses a conductor to directly connect the incoming terminal and the outgoing terminal of the corresponding N-pole circuit breaker.

As shown in Figure 6, the lower surface of the circuit breaker housing 2 is provided with an adjusting screw mounting hole 212. The adjusting screw is assembled on the circuit breaker housing 2 through the adjusting screw mounting hole 212 and is connected with both sides of the overload protection mechanism 9. Metal piece contact, used to adjust the position of the bimetal piece.

Preferably, as shown in Figure 18, the left side and/or the right side are provided with installation guide positioning steps 214, and the installation guide positioning steps 214 protrude from the left side and/or the right side. During the process of assembling the circuit breaker to the circuit breaker assembly position and installing it in place, the installation guide positioning step 214 cooperates with the housing of the circuit breaker assembly position for guidance to prevent the small circuit breaker from not being assembled in place. Specifically, the installation guide positioning step 214 It includes a first step 2141 and a second step 2142. The distance between the first step 2141 and the front end surface is greater than the distance between the second step 2142 and the front end face. The upper end of the first step 2141 is connected to the upper surface of the circuit breaker housing 2, and the second step 2141 is connected to the upper surface of the circuit breaker housing 2. The lower end of the step 2142 is connected to the lower surface of the circuit breaker housing 2 . Further, the first step 2141 and the second step 2142 are arranged in parallel, and both are parallel to the front end surface and the rear end surface.

Preferably, as shown in Figures 12 to 18, the small circuit breaker also includes an indicating device, which is driven and matched with the operating part. In this embodiment, the indicating device is driven and matched with the operating part. When the small circuit breaker is closed, the operating The piece-driven indicating device blocks the stitch removal hole 201. Further, the indicating device may be the above-mentioned indicating device. Further, the operating member may be a button mechanism 1 or an operating handle.

Preferably, as shown in FIG. 18 , a protective boss 20a is provided on each left and right side of the operating part mounting hole 1020 to reduce the operating part from being hit by external objects, thereby extending the service life of the operating part. Preferably, one protective boss 20a is provided on the left front end of the circuit breaker housing 2, and the other protective boss 20a is provided on the right front end of the circuit breaker housing 2.

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

Claims (9)

1. The miniature circuit breaker is characterized by comprising a button mechanism (1), a circuit breaker shell (2) and a locking mechanism; the button mechanism (1) is arranged at one end of the circuit breaker shell (2) and is in sliding fit with the circuit breaker shell, the locking mechanism comprises a second locking piece (4), the second locking piece (4) is pivotally arranged on the circuit breaker shell (2), the circuit breaker shell (2) comprises a second opening (204) arranged at one side of the second locking piece, one end of the second locking piece (4) is in driving fit with the button mechanism (1), and the other end of the second locking piece passes through the second opening (204) to be in limiting fit with the shell of the circuit breaker assembly position; the button mechanism (1) comprises a button head (10), a button main body (11) and a first connecting rod (1050), one end of the first connecting rod (1050) is inserted on the button main body (11) and is in driving fit with the second locking piece (4), the button head (10) is located on one side of the button main body (11) so that a user can operate the button head (10), the first connecting rod (1050) is in transmission fit with the button main body (11), and when the button mechanism (1) is pulled outwards towards the circuit breaker shell (2), the first connecting rod (1050) drives the second locking piece (4) to rotate, so that the second locking piece (4) is in limiting fit with the shell of the circuit breaker assembly position.

2. The miniature circuit breaker of claim 1, wherein: the locking mechanism further comprises a second locking spring, the second locking piece (4) comprises a second locking piece main body (41) and second locking piece protrusions (40) and second locking piece driving arms (42) which are respectively arranged at two ends of the second locking piece main body (41), the second locking piece main body (41) is pivotally arranged on the circuit breaker shell (2), the second locking piece driving arms (42) are in driving fit with the first connecting rods (1050), the second locking piece protrusions (40) penetrate through the second holes (204) to protrude out of the circuit breaker shell (2), after the miniature circuit breaker is assembled to the circuit breaker assembling position and is installed in place, the second locking piece protrusions (40) penetrate through the second holes (204) to be in limiting fit with the shell of the circuit breaker assembling position, when the push button mechanism (1) is pulled outwards of the circuit breaker shell (2), the first connecting rods (1050) drive the second locking piece driving arms (42) to rotate, so that the second locking piece protrusions (40) move inwards the circuit breaker shell (2), and the limit fit between the second locking piece protrusions (40) and the circuit breaker shell (4) are released from limiting fit with the shell position.

3. The miniature circuit breaker of claim 1, wherein: the first connecting rod (1050) is a U-shaped rod, a transmission rod mounting table (12) is arranged on the button main body (11), one end of the first connecting rod (1050) penetrates through the transmission rod mounting table (12) and forms a first transmission rod (3041) protruding on one side of the transmission rod mounting table (12), the first transmission rod (3041) is in driving fit with the second locking piece (4), and when the button mechanism (1) is pulled outwards towards the circuit breaker shell (2), the first transmission rod (3041) drives the second locking piece (4) to rotate, so that the second locking piece (4) is in limiting fit with the shell of the circuit breaker assembly position.

4. The miniature circuit breaker of claim 1, wherein: the miniature circuit breaker further comprises an operating mechanism (5), a moving contact (56) and a fixed contact (560), the other end of the first connecting rod (1050) is connected with the operating mechanism (5), the button mechanism (1) is in driving connection with the operating mechanism (5) through the first connecting rod (1050), and when the button mechanism (1) is pressed towards the inner side of the circuit breaker shell (2), the button mechanism (1) drives the operating mechanism (5) to act through the first connecting rod (1050), and the operating mechanism (5) drives the moving contact (56) to be closed with the fixed contact (560); when the button mechanism (1) is pulled towards the outer side of the circuit breaker shell (2), the button mechanism (1) drives the operating mechanism (5) to act through the first connecting rod (1050), and the operating mechanism (5) drives the moving contact (56) to be disconnected with the fixed contact (560).

5. The miniature circuit breaker of claim 4, wherein: the miniature circuit breaker further comprises a short-circuit protection mechanism (6) and an overload protection mechanism (9), when the miniature circuit breaker is in a closing state and a short-circuit or overload fault occurs, the short-circuit protection mechanism (6) or the overload protection mechanism (9) drives an operating mechanism (5) to act, and the operating mechanism (5) drives a moving contact (56) to be disconnected with a fixed contact (560).

6. The miniature circuit breaker of claim 4, wherein: the operating mechanism (5) further comprises a brake separating rod (15), the brake separating rod (15) comprises a brake separating rod connecting end and a brake separating rod driving end, the brake separating rod connecting end is connected with the button mechanism (1), and the brake separating rod driving end is in driving fit with the operating mechanism (5); when the miniature circuit breaker is in a closing state, the button mechanism (1) is pressed in the circuit breaker shell (2), the brake separating rod (15) drives the operating mechanism (5) to act, and the operating mechanism (5) drives the moving contact (56) to be disconnected with the fixed contact (560).

7. The miniature circuit breaker of claim 6, wherein: the operating mechanism (5) further comprises a button mechanism reset piece (10 a), a guide boss (20) and a guide groove group, wherein the guide boss and the guide groove group are matched with the brake separating rod (15) and are arranged on the breaker shell (2); the guide groove group comprises a first guide groove (21), a second guide groove (22), a third guide groove (23), a fourth guide groove (24) and a fifth guide groove (25), wherein the first guide groove (21), the second guide groove (22), the third guide groove (23), the fourth guide groove (24) and the fifth guide groove (25) are connected end to form an annular guide groove group surrounding the guide boss (20);

When the miniature circuit breaker is in a switching-off state, the button mechanism (1) is pressed, the switching-off rod driving end of the switching-off rod (15) enters a third guide groove (23) from a first guide groove (21) through a second guide groove (22), the miniature circuit breaker enters a switching-on state, the button mechanism (1) is released, the button mechanism reset piece (10 a) drives the switching-off rod driving end to enter a fourth guide groove (24) from the third guide groove (23) through the button mechanism (1), and the switching-off rod driving end is in limit fit with the guide boss (20); the button mechanism (1) is pressed again, the button mechanism (1) drives the operating mechanism (5) to act through the driving end of the brake separating rod, the operating mechanism (5) drives the button mechanism (1) to reset, the driving end of the brake separating rod is driven by the button mechanism (1) to enter the first guide groove (21) through the fifth guide groove (25) by the fourth guide groove (24), and the miniature circuit breaker enters a brake separating state.

8. The miniature circuit breaker of claim 5 or 6 or 7, characterized in that: the operating mechanism (5) further comprises a transmission part (51), a second connecting rod (52), a locking part (53), a supporting part (54), a trip piece (55) and a first reset spring (57), wherein the transmission part (51) and the supporting part (54) are respectively and pivotally arranged on the circuit breaker shell (2), the supporting part (54) is elastically connected with the circuit breaker shell (2) through the first reset spring (57), the locking part (53) and the trip piece (55) are respectively and pivotally arranged on the supporting part (54), the button mechanism (1) is connected with the transmission part (51) in a driving mode through a first connecting rod (1050), the transmission part (51) is connected with the locking part (53) in a driving mode through the second connecting rod (52), the locking part (53) is matched with the trip piece (55) in a locking mode, the trip piece (55) is matched with the supporting part (54) in a driving mode, the supporting part (54) is connected with the moving contact (56), and when the small circuit breaker is in a closing state, the trip piece (55) of the operating mechanism (5) is driven, and the supporting part (54) drives the moving contact (560) to be disconnected with the moving contact (56).

9. The miniature circuit breaker of claim 1, wherein: the miniature circuit breaker further comprises a closing prevention mechanism, the closing prevention mechanism comprises a first locking piece (3) and a first locking spring, the first locking piece (3) comprises a first locking piece main body (31) and first locking piece protrusions (30) and first locking piece blocking arms (32) which are respectively arranged at two ends of the first locking piece main body (31), the first locking piece main body (31) is pivotally arranged on the circuit breaker shell (2), the circuit breaker shell (2) comprises a first opening (203) arranged at one side of the circuit breaker shell, the first locking spring is respectively connected with the first locking piece main body (31) and the circuit breaker shell (2), the first locking piece blocking arms (32) are in locking fit with the button mechanism (1), the first locking piece protrusions (30) penetrate through the first opening (203) to protrude out of the circuit breaker shell (2), and after the miniature circuit breaker is assembled to the circuit breaker assembly position and in place, the shell of the circuit breaker assembly position presses the first locking piece protrusions (30), and the first locking piece blocking arms (32) are in locking fit with the button mechanism (1) in a locking mode.