A small circuit breaker

Abstract

A small circuit breaker, which relates to the field of low-voltage electrical appliances, includes a housing; a handle; an operating mechanism, including: a linkage rod, an L-shaped groove composed of a horizontal groove and a vertical groove is provided at its upper end; a lock, which can be rotatably arranged on the linkage rod, one end of which is provided with a hook, and the hook can cooperate with the vertical groove to form a locking position, and the other end of which is provided with at least one linkage part; a U-shaped connecting rod, one end of which is linked with the handle, and the other end is placed in the L-shaped groove, and the L and N pole moving contacts are independently rotatable in the first chamber and the second chamber, and only form a linkage with the operating mechanism through a pull rod; L and N pole static contacts; a current trip assembly, and an overcurrent trip rod is provided between its action end and the linkage part of the lock of the operating mechanism. By rationalizing the structural optimization of the operating mechanism, multi-functions can be realized on the basis of unchanged volume.

Description

Technical Field

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

[0002] Small circuit breakers, especially those with a width of 18mm, have a small internal space and need to integrate multiple functions. The conventional operating mechanism includes parts such as tripping buckles, locking buckles, and contact supports, which results in a large size of the entire operating mechanism, which occupies a large internal space. As a result, the internal space is relatively tight. For some functions, they can only be selectively deleted or the corresponding circuit breaker volume can be increased. Summary of the invention

[0003] In view of the shortcomings of the prior art, an object of the present invention is to provide a miniature circuit breaker.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A miniature circuit breaker comprises a housing composed of a first housing, an intermediate housing and a second housing, wherein the housing is divided into a first chamber and a second chamber by the intermediate housing, and comprises:

[0006] A handle rotatably disposed between the first shell and the second shell;

[0007] An operating mechanism is disposed in the first chamber, and the operating mechanism comprises:

[0008] A linkage rod is rotatably disposed in the first chamber, an upper end of which is provided with an L-shaped groove consisting of a transverse groove and a vertical groove, and the linkage rod part passes through the intermediate housing and is disposed in the second chamber;

[0009] A lock buckle is rotatably mounted on the linkage rod, one end of which is provided with a hook head, and the hook head can cooperate with the vertical groove to form a locking position, and the other end of which is provided with at least one linkage part;

[0010] The U-shaped connecting rod has one end linked to the handle and the other end placed in the L-shaped groove.

[0011] The L-pole moving contact and the N-pole moving contact are independently and rotatably arranged in the first chamber and the second chamber, and are linked with the operating mechanism only through the pull rod, and the L-pole moving contact and the N-pole moving contact are supported and fixed by the housing;

[0012] The L-pole static contact and the N-pole static contact are respectively arranged at the front end of the movement path of the L-pole moving contact and the N-pole moving contact;

[0013] The current tripping assembly is arranged in the first chamber, and an overcurrent tripping rod is arranged between the action end of the current tripping assembly and the linkage part of the lock of the operating mechanism.

[0014] Furthermore, reset elastic members for imparting opening kinetic energy to the L-pole moving contact and the N-pole moving contact are respectively provided between the L-pole moving contact and the N-pole moving contact and the housing.

[0015] Furthermore, the intermediate shell is provided with two reinforcing ribs, and a guide groove is formed between the two reinforcing ribs, and the overcurrent tripping rod can be slidably placed in the guide groove.

[0016] Furthermore, the left-right swinging amplitude of the L-pole moving contact and the N-pole moving contact is limited by the gap between the pull rod and the reinforcing rib.

[0017] Furthermore, the front end of the overcurrent tripping rod is provided with a first action part for driving the lock to rotate relative to each other and a second action part which forms a linkage with the L-pole moving contact.

[0018] Furthermore, a leakage tripping mechanism is also provided in the second chamber.

[0019] Furthermore, the lock is provided with a first linkage part passing through the intermediate shell and entering the second chamber, and the leakage release mechanism includes a leakage release rod and a leakage release device rotatably arranged in the second chamber, the rotation center of the leakage release rod is located above the leakage release device, and the first driving part is extended downward with the rotation center, the first driving part is partially placed in front of the action end of the leakage release device, and the upper end of the first driving part extends upward to form a second driving part for triggering the first linkage part.

[0020] Furthermore, a reset torsion spring is provided on the leakage trip rod, and one end of the reset torsion spring extends to the movement path of the linkage rod, and a protrusion is provided on one end of the linkage rod facing the reset torsion spring.

[0021] Furthermore, a double gold sheet mechanism is provided in the first chamber, the lock buckle is further provided with a second linkage part for forming a linkage cooperation with the double gold sheet, and a third linkage part forming a linkage cooperation with the overcurrent release rod is coaxially arranged with the second linkage part.

[0022] Furthermore, the current tripping component comprises:

[0023] The yoke is U-shaped and has a front end wall, a rear end wall and a connecting wall connecting the two;

[0024] The core assembly, whose front and rear ends are respectively connected to the front wall and the rear wall, comprises:

[0025] An iron core casing with one end open;

[0026] A moving iron core disposed in an iron core casing;

[0027] A static iron core is arranged at the opening, and a movable cavity is formed between the static iron core and the moving iron core;

[0028] A push rod is slidably disposed in the movable cavity, and one end of the push rod passes through the static iron core;

[0029] A reset member, disposed in the movable cavity;

[0030] A coil is wound around the outer periphery of the core assembly,

[0031] The outer wall of the core sleeve is provided with a limiting piece for forming a limiting cooperation with the rear end wall.

[0032] The beneficial effects of the present invention are as follows: by rationalizing the structural optimization of the operating mechanism, reducing the size of the entire operating mechanism, and designing the moving contact and the operating mechanism separately, the space inside the circuit breaker is increased, the functional areas can be better divided, and multi-functions can be realized on the basis of unchanged volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the handle, operating mechanism and moving contact of the present invention when they are matched (locked).

[0034] Figure 2 It is a schematic diagram of the structure of the handle, operating mechanism and moving contact of the present invention when they are matched (unlocked).

[0035] Figure 3 It is a schematic diagram of the cooperation between the linkage rod and the lock buckle of the present invention, a is when locked, and b is when unlocked.

[0036] Figure 4 It is a front view of the linkage rod of the present invention.

[0037] Figure 5 It is a structural schematic diagram of the linkage rod of the present invention.

[0038] Figure 6 It is a schematic structural diagram of the lock buckle of the present invention.

[0039] Figure 7 This is a schematic diagram of an explosion of Example 1 of the present invention.

[0040] Figure 8 This is a schematic structural diagram of the first chamber of Example 1 of the present invention.

[0041] Fig. 9 This is a schematic structural diagram of the second chamber of Example 1 of the present invention.

[0042] Fig.10 This is a schematic structural diagram of the first chamber of Example 2 of the present invention.

[0043] Fig.11 This is a schematic structural diagram of the second chamber of Example 2 of the present invention.

[0044] Fig.12 It is a structural schematic diagram of the current tripping component of the present invention.

[0045] Fig.13 It is a partial schematic diagram of the current tripping assembly of the present invention.

[0046] Fig.14 It is a structural schematic diagram of the leakage tripping mechanism of the present invention.

[0047] Fig.15 It is a schematic structural diagram of the double gold sheet of the present invention.

[0048] Fig.16 It is a schematic structural diagram of the current release of the present invention.

[0049] Fig.17 It is a cross-sectional schematic diagram of the current release of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] Conventional circuit breakers generally have operating mechanisms composed of contact supports, trip buckles and lock buckles, wherein the moving contact is fixedly arranged on the contact support, and the moving contact is driven by the contact support to achieve closing and opening with the static contact. The existence of the contact support will cause the entire operating mechanism to be relatively large, occupying a large amount of space inside the circuit breaker, especially the 18mm small circuit breaker, which has a small internal space, and the operating mechanism occupies a large amount of space, thereby making the internal space more limited and unable to achieve multi-functional expansion. In response to this, the present invention simplifies the operating mechanism, omits the design of the contact support and trip buckle, and by independently designing the operating mechanism and the moving contact, a space can be formed between the two, which is convenient for the installation of some functional parts, thereby making the internal space utilization rate higher and being able to meet the multi-functional design requirements.

[0053] like Figure 7 As shown, the present invention discloses a miniature circuit breaker, which includes a shell consisting of a first shell 10, an intermediate shell 20 and a second shell 30, and the shell is divided into a first chamber and a second chamber by the intermediate shell 20, and the shell is divided into areas by the intermediate shell to form two independent chambers, which can be used to install an L-pole operating mechanism and an N-pole operating mechanism respectively, and the intermediate shell is therebetween to achieve electrical isolation between the two, and the reliability is high.

[0054] A groove is provided at the upper end of the intermediate shell so that the first shell and the second shell are connected at this location, and is used to place a handle, namely the handle 100 , which can be rotatably disposed between the first shell 10 and the second shell 30 .

[0055] An independent operating mechanism 50 is provided in the first chamber, and the operating mechanism 50 comprises:

[0056] The linkage rod 400 is rotatably disposed in the first chamber. Figure 4 As shown, an L-shaped groove 410 consisting of a transverse groove 411 and a vertical groove 412 is provided at its upper end, and the linkage rod 400 partially passes through the intermediate housing 20 and is placed in the second chamber;

[0057] The lock buckle 300 is rotatably mounted on the linkage rod 400. Figure 6 As shown, a hook head 310 is provided at one end thereof, and the hook head 310 can cooperate with the vertical slot 412 to form a locking position, and at least one linkage portion is provided at the other end thereof;

[0058] One end of the U-shaped connecting rod 200 is linked to the handle 100, and the other end is placed in the L-shaped groove.

[0059] By adopting this operating mechanism, the linkage rod, the lock and the U-shaped connecting rod can all be arranged in the first chamber, and there is no need to arrange a corresponding operating mechanism in the second chamber. Compared with the previous contact support design, it can save a lot of space in the second chamber. At the same time, through the design that the linkage rod and the lock part pass through the intermediate shell, the N-pole moving contact in the second chamber can be linked with it. This structure greatly simplifies the entire operating mechanism and reduces the occupied space inside the circuit breaker.

[0060] The L-pole moving contact 510 and the N-pole moving contact 520 are independently rotatably disposed in the first chamber and the second chamber, and are linked with the operating mechanism 50 only through the pull rod 600, and the L-pole moving contact 510 and the N-pole moving contact 520 are supported and fixed by the shell.

[0061] Furthermore, two reinforcing ribs 21 are provided on the intermediate shell 20, and the two reinforcing ribs 21 cooperate with the first shell or the second shell to achieve left and right side limiting of the moving contact 500, ensuring that it will not shake during the opening and closing process. At the same time, the design of the reinforcing ribs can also reduce the contact area between the moving contact and the shell, making the opening and closing action faster. At the same time, corresponding reinforcing ribs can also be set on the first shell or the second shell.

[0062] Furthermore, the left and right swinging range of the L-pole moving contact 510 and the N-pole moving contact 520 is limited by the gap between the pull rod 600 and the reinforcing rib 21. By directly using the housing as the rotating structure of the moving contact, the position of the moving contact in the housing can be freely adjusted without being affected by the operating mechanism, and the internal space can be better used.

[0063] That is, the moving contact is fixed directly through the housing, one end of which is hinged to the housing, and the other end of which is provided with a contact point. When the pull rod is driven by the operating mechanism, it can push or pull the contact to make it contact or separate with the static contact. At the same time, further, a reset elastic member for giving the L-pole moving contact 510 and the N-pole moving contact 520 opening kinetic energy is respectively provided between the L-pole moving contact 510 and the N-pole moving contact 520 and the housing. The reset elastic member can be a spring or a tension spring, and a spring is used in this embodiment. It gives the moving contact a force for rapid separation, thereby realizing rapid opening.

[0064] The L-pole static contact 710 and the N-pole static contact 720 are respectively arranged at the front end of the movement path of the L-pole moving contact 510 and the N-pole moving contact 520, that is, the moving contact can be closed with the static contact by the linkage rod through the pull rod 600.

[0065] like Figure 1 As shown, the present application utilizes an L-shaped groove 410 provided at the upper end of the linkage rod, one end of the U-shaped connecting rod 200 is embedded in the L-shaped groove, and the other end thereof is provided in linkage with the handle, so that the movement of the handle drives the U-shaped connecting rod to move in the L-shaped groove, and combined with the design of a lock buckle that can rotate relative to the linkage rod, when the lock buckle is in the initial state, a torsion spring is used to give it counterclockwise rotation, and then a hook is used to surround one end of the U-shaped connecting rod in the vertical groove 412 of the L-shaped groove, that is, a locking position 1000 is formed, as shown in FIG. Figure 3 As shown in a in the figure, at this time, the U-shaped connecting rod is restricted by the two, and it presses against the linkage rod. At the same time, the linkage rod pushes the contact through the pull rod, so that the moving contact contacts the static contact to complete the closing. Moreover, because the pull rod is set approximately vertically to the moving contact, the moving contact can be maintained in the closed state at all times.

[0066] like Figure 2 As shown, when the lock buckle is impacted, it drives the lock buckle to rotate clockwise, and when it rotates to a certain angle, the hook head and the L-shaped groove open to expose the opening 2000, as shown in FIG. Figure 3As shown in b, the U-shaped connecting rod will slide out of the opening and enter the transverse groove. At this time, since the restriction of the U-shaped connecting rod on the linkage rod is released, the linkage rod rotates relatively, thereby driving the pull rod to move, releasing the restriction of the pull rod on the moving contact, and the moving contact quickly opens.

[0067] The current trip assembly 60 is disposed in the first chamber, and an overcurrent trip rod 61 is disposed between its action end and the linkage part of the lock 300 of the operating mechanism 50, see Fig.12 The action end of the current trip assembly cooperates with one end of the overcurrent trip rod, and its action drives the overcurrent trip rod to slide relatively, so that the other end of the overcurrent trip rod touches the linkage part of the lock, so that the U-shaped connecting rod is released from the locked position, completing the tripping and opening. Thus, it has the overcurrent protection function.

[0068] At the same time, a guide groove is formed between the two reinforcing ribs 21, and the overcurrent trip rod 61 can be slidably placed in the guide groove. The two guide grooves are used to guide the sliding of the current trip rod. At the same time, the space between the intermediate housing and the moving contact can be used to accommodate the overcurrent trip rod, which has a higher space utilization rate. Further, the space between the moving contact and the first housing can be freed up to facilitate the installation of other functional parts.

[0069] Furthermore, the front end of the overcurrent tripping rod 61 is provided with a first action part 611 for driving the lock catch 300 to rotate relative to each other and a second action part 612 which forms a linkage with the L-pole moving contact 510. That is, the L-pole moving contact is placed in the gap between the first action part and the second action part, and will not be interfered by the current tripping rod during normal opening and closing. When the current tripping assembly is actuated, the first action part will touch the lock catch, thereby causing the lock catch to release the lock on the U-shaped connecting rod. At this time, the moving contact is opened because the top pressure of the pull rod is released. When the fault is cleared and the switch needs to be closed, the moving contact is driven to close, and at the same time, it will drive the second action part to operate, so that the overcurrent tripping rod is reset.

[0070] like Fig.13 As shown, preferably, a guide hole 613 is provided on the overcurrent tripping rod, and a guide block 22 is provided in the guide groove. The guide block is placed in the guide hole, and the two form a sliding fit. The guide block serves to limit the moving distance of the overcurrent tripping rod.

[0071] like Fig.16 and Fig.17 As shown, the current tripping assembly 60 includes:

[0072] The yoke 69 is U-shaped and has a front end wall, a rear end wall and a connecting wall connecting the two;

[0073] The core assembly, whose front and rear ends are respectively connected to the front wall and the rear wall, comprises:

[0074] An iron core sleeve 62 with an open end;

[0075] A moving iron core 66 disposed in the iron core casing;

[0076] A static iron core 67 is disposed at the opening, and a movable cavity 68 is formed between the static iron core 67 and the movable iron core 66;

[0077] A push rod 65 is slidably disposed in the movable cavity 68, and one end of the push rod 65 passes through the static iron core;

[0078] A reset member, disposed in the movable cavity 68;

[0079] The coil 63 is wound around the outer periphery of the core assembly.

[0080] The outer wall of the core sleeve 62 is provided with a limiting member 64 for forming a limiting cooperation with the rear end wall.

[0081] The core assembly is fixed by utilizing the cooperation between the outer wall of the core sleeve 62 and the magnetic yoke. This fixing method fixes the core sleeve and the static core, so there is no need to fix the push rod and the moving core, thus avoiding the problem of eccentricity of the push rod when the push rod and the moving core need to be knocked and fixed in previous operations.

[0082] Furthermore, a leakage tripping mechanism 80 is also provided in the second chamber, so that it has a leakage protection function.

[0083] Furthermore, the lock buckle 300 is provided with a first linkage portion 311 that passes through the intermediate housing 20 and enters the second chamber, and the leakage tripping mechanism 80 includes a leakage tripping rod 81 and a leakage tripping device 82 that are rotatably arranged in the second chamber, such as Fig.14 As shown, the rotation center of the leakage release rod is located above the leakage release 82, and the first driving part 811 is extended downward from the rotation center. The first driving part 811 is partially placed in front of the action end of the leakage release, and the upper end of the first driving part 811 extends upward to form a second driving part 812 for triggering the first linkage part 311.

[0084] The leakage release is arranged above the mutual inductance coil, and the leakage release rod is arranged above the leakage release. The top rod of the leakage release is used to drive the leakage release rod to swing relatively, thereby triggering the lock.

[0085] The leakage release rod is hinged at one end, so that it can be distributed along the outer contour of the leakage release, greatly reducing the occupied space. At the same time, the slightly longer first drive part 811 is designed so that it can be rotated with a smaller force, thereby triggering the lock.

[0086] Furthermore, a reset torsion spring 83 is provided on the leakage tripping rod, and one end of the reset torsion spring 83 extends to the movement path of the linkage rod 400, and a protrusion 430 is provided on one end of the linkage rod 400 facing the reset torsion spring 83. At the same time, the linkage rod is used to press the reset torsion spring to drive the reset of the leakage tripping rod, which further reduces the design of parts and reduces the space occupied by the leakage tripping mechanism.

[0087] Furthermore, a double gold sheet mechanism 70 is also provided in the first chamber. Fig.15 As shown, the lock buckle 300 is further provided with a second linkage portion 313 for forming a linkage cooperation with the double gold sheet 71 , and a third linkage portion 312 for forming a linkage cooperation with the overcurrent tripping rod 61 is coaxially arranged with the second linkage portion 313 .

[0088] The present application utilizes the space between the L-pole moving contact and the operating mechanism to horizontally move the double gold sheet mechanism between the two, and utilizes the space between the L-pole moving contact and the first shell so that the double gold sheet does not interfere with the L-pole moving contact. At the same time, a coaxially arranged second linkage part and a third linkage part are adopted to realize a dual-function design of double gold sheet tripping and overcurrent tripping. In addition, space for the mutual inductance coil and the leakage releaser in the second chamber can be reserved between the horizontally moving double gold sheet mechanism and the wiring terminal, and the space utilization rate is higher.

[0089] At the same time, the adjusting screw 72 of the double metal sheet 71 is moved from the side of the circuit breaker to the bottom of the circuit breaker, and its adjustment will not be affected by the lateral movement of the double metal sheet mechanism.

[0090] like Figure 8 and Fig. 9 As shown, the present invention provides an embodiment, in which two ends of the first chamber are provided with connecting terminals 40, such as Figure 8 As shown, a relief position is formed between the left terminal and the double gold sheet mechanism 70, which is convenient for installing the mutual inductance coil located at the lower side and the leakage tripping mechanism 80 located at the upper side. The left side of the right terminal is respectively provided with a current tripping assembly 60 and an arc extinguishing chamber. The arc extinguishing chamber is arranged below the current tripping assembly, and the operating mechanism is arranged at the upper left thereof. The handle is arranged on the right side of the operating mechanism. At the same time, the L-pole moving contact is arranged between the operating mechanism and the current tripping assembly, and the double gold sheet mechanism is located on the left side of the moving contact. Its structure is reasonable and compact. Fig. 9 As shown, a leakage tripping mechanism is provided in the second chamber, and a leakage test assembly 90 is provided above the leakage tripping mechanism, which realizes the design of the leakage test circuit through a torsion spring, and the leakage test circuit is turned on by pressing the torsion spring through the leakage button.

[0091] And as Fig.10 and Fig.11As shown, the present invention also discloses Example 2, which differs from Example 1 in that it adds a status indication function. In order to add this function, in Example 2, the leakage test component 90 is moved from the second chamber to the first chamber and is located on the left side of the operating mechanism. The test resistor is placed in the avoidance space to maximize the use of the internal space. At the same time, the position where the leakage test component is placed in the original Example 1 is designed as the status indication component 91, as shown in FIG. Fig.11 As shown, the switching indication of the status is realized by utilizing the action of the leakage tripping rod or the linkage rod.

[0092] The embodiments should not be regarded as limiting the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A miniature circuit breaker, comprising a housing composed of a first housing (10), an intermediate housing (20) and a second housing (30), wherein the housing is divided into a first chamber and a second chamber by the intermediate housing (20), characterized in that: It includes: A handle (100) rotatably disposed between the first shell (10) and the second shell (30); The operating mechanism (50) is disposed in the first chamber, and the operating mechanism (50) comprises: A linkage rod (400) is rotatably disposed in the first chamber, and an L-shaped groove (410) composed of a transverse groove (411) and a vertical groove (412) is disposed at an upper end thereof, and a portion of the linkage rod (400) passes through the intermediate housing (20) and is disposed in the second chamber; A lock buckle (300) is rotatably disposed on the linkage rod (400), one end of which is provided with a hook head, and the hook head can cooperate with the vertical groove (412) to form a locking position, and the other end of which is provided with at least one linkage portion; The U-shaped connecting rod (200) has one end linked to the handle (100) and the other end placed in the L-shaped groove. The L-pole moving contact (510) and the N-pole moving contact (520) are independently rotatably disposed in the first chamber and the second chamber, and are linked with the operating mechanism (50) only through the pull rod (600), and the L-pole moving contact (510) and the N-pole moving contact (520) are supported and fixed by the housing; The L-pole static contact (710) and the N-pole static contact (720) are respectively arranged at the front end of the movement path of the L-pole moving contact (510) and the N-pole moving contact (520); The current tripping assembly (60) is arranged in the first chamber, and an overcurrent tripping rod (61) is arranged between the action end of the current tripping assembly and the linkage part of the lock (300) of the operating mechanism (50).

2. A miniature circuit breaker according to claim 1, characterized in that: Reset elastic members for imparting opening kinetic energy to the L-pole moving contact (510) and the N-pole moving contact (520) are respectively provided between the L-pole moving contact (510) and the N-pole moving contact (520) and the housing.

3. A miniature circuit breaker according to claim 1, characterized in that: Two reinforcing ribs (21) are provided on the intermediate housing (20), and a guide groove is formed between the two reinforcing ribs, and the overcurrent tripping rod (61) can be slidably placed in the guide groove.

4. A miniature circuit breaker according to claim 3, characterized in that: The left-right swing amplitude of the L-pole moving contact (510) and the N-pole moving contact (520) is limited by the gap between the pull rod (600) and the reinforcing rib (21).

5. A miniature circuit breaker according to claim 3, characterized in that: The front end of the overcurrent tripping rod (61) is provided with a first action part (611) for driving the lock catch (300) to rotate relatively, and a second action part (612) that forms a linkage with the L-pole moving contact (510).

6. A miniature circuit breaker according to claim 1, characterized in that: The second chamber is also provided with a leakage tripping mechanism (80).

7. A miniature circuit breaker according to claim 6, characterized in that: The lock buckle (300) is provided with a first linkage part (311) passing through the intermediate housing (20) and entering the second chamber. The leakage tripping mechanism (80) comprises a leakage tripping rod (81) and a leakage tripping device (82) rotatably arranged in the second chamber. The rotation center of the leakage tripping rod is located above the leakage tripping device (82), and the first driving part (811) is extended downward from the rotation center. The first driving part (811) is partially arranged in front of the action end of the leakage tripping device, and the upper end of the first driving part (811) extends upward to form a second driving part (812) for triggering the first linkage part (311).

8. A miniature circuit breaker according to claim 7, characterized in that: A reset torsion spring (83) is provided on the leakage tripping rod, and one end of the reset torsion spring (83) extends to the movement path of the linkage rod (400), and a protrusion (430) is provided on one end of the linkage rod (400) facing the reset torsion spring (83).

9. A miniature circuit breaker according to claim 1, characterized in that: A double gold sheet mechanism (70) is also provided in the first chamber, the lock buckle (300) is also provided with a second linkage portion (313) for forming a linkage with the double gold sheet (71), and a third linkage portion (312) for forming a linkage with the overcurrent tripping rod (61) is coaxially arranged with the second linkage portion (313).

10. A miniature circuit breaker according to claim 1, characterized in that: The current tripping component (60) comprises: The magnetic yoke (69) is arranged in a U shape and has a front end wall, a rear end wall and a connecting wall connecting the two; The core assembly, whose front and rear ends are connected to the front wall and the rear wall respectively, comprises: An iron core sleeve (62) with an open end; A moving iron core (66) disposed in the iron core sleeve; A static iron core (67) is arranged at the opening, and a movable cavity (68) is formed between the static iron core (67) and the movable iron core (66); A push rod (65) is slidably disposed in the movable cavity (68), and one end of the push rod passes through the static iron core; A reset member, disposed in the movable cavity (68); The coil (63) is wound around the outer periphery of the core assembly. The outer wall of the core sleeve (62) is provided with a limiting member (64) for forming a limiting fit with the rear end wall.

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