Operating mechanism of miniature circuit breaker

Abstract

An operating mechanism of a miniature circuit breaker comprises a handle, a transmission rod, a jump pin, a lever, a lock catch and a contact support used for bearing a moving contact, the lever, the lock catch and the contact support are installed on a rotating shaft in a pivoted mode, the jump pin, the lever and the contact support are hinged to a hinge shaft, the jump pin is matched with the lock catch in a locking mode, and the handle drives the jump pin to rotate through the transmission rod. The jump pin drives the lever and the contact support to rotate around the rotating shaft through the hinge shaft. According to the operating mechanism of the miniature circuit breaker, the lever, the lock catch and the contact support share the same rotating shaft, and the jump pin, the lever and the contact support share the same articulated shaft, so that the structure of the operating mechanism is simplified, all the parts are assembled into a whole through the two shafts, the assembling and connecting mode is simple and reliable, and automatic assembling is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to an operating mechanism of a miniature circuit breaker. Background Art

[0002] The miniature circuit breaker realizes the opening and closing operations of the circuit through an external handle, and uses various protection mechanisms to detect faults to unlock the operating mechanism of the miniature circuit breaker, so as to disconnect the circuit affected by various faults. It usually has an overcurrent protection function. After an overcurrent occurs in the circuit, the operating mechanism is unlocked through instantaneous or overload devices to achieve the function of disconnecting the circuit. In recent years, intelligent manufacturing has been gradually promoted. The traditional operating mechanism has a complex structure, and it is difficult to achieve automated assembly due to structural limitations, and the parts are prone to deformation.

[0003] In addition, in recent years, the degree of electrification in China has become higher and higher. Whether it is industrial electricity or household electricity, the power has increased significantly, which requires the rated current of the circuit breaker to increase accordingly. After the rated current of the circuit breaker increases, the heat generation increases. After the heat generation increases, the plastic material connected to the moving contact will be deformed by heat, thus affecting the reliability of the operation of the circuit breaker. Summary of the Invention

[0004] The purpose of the present invention is to overcome at least one defect of the prior art and provide an operating mechanism of a miniature circuit breaker.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The operating mechanism of the miniature circuit breaker includes a handle, a transmission rod, a tripping latch, a lever, a locking latch, and a contact support for carrying a moving contact. The lever, the locking latch, and the contact support are pivotally installed on a rotating shaft. The tripping latch, the lever, and the contact support are hinged on a hinge shaft. The tripping latch is in locking cooperation with the locking latch. The handle drives the tripping latch to rotate through the transmission rod, and the tripping latch drives the lever and the contact support to rotate around the rotating shaft through the hinge shaft.

[0007] Optionally, the lever is provided with a limiting groove for restricting the axial movement of the contact support along the rotating shaft. One end of the contact support, the connecting end, is connected to the moving contact, and the other end of the contact support, the mounting end, is limited in the limiting groove of the lever.

[0008] Optionally, the lever includes a connecting plate and two spaced limiting plates. The two limiting plates are arranged in sequence along the axial direction of the rotating shaft. The connecting plate is connected between the two limiting plates to enclose and form the limiting groove.

[0009] Optionally, the rotating shaft passes through the mounting end of the contact support and the lever, the hinge shaft passes through the mounting end of the contact support and the lever, the mounting end of the contact support is provided with a first rotating shaft hole close to the moving contact and a first hinge hole away from the moving contact, and the lever is provided with a second hinge hole and a second rotating shaft hole.

[0010] Optionally, it also includes a first reset spring for resetting the lock, wherein the first reset spring is sleeved on the rotating shaft, one end of the first reset spring is connected to the lever, and the other end is connected to the lock.

[0011] Optionally, a limiting portion is provided on the lock buckle, and the limiting portion of the lock buckle cooperates with the lever limiting portion to limit the axial movement of the lock buckle along the rotating shaft.

[0012] Optionally, the lock buckle is stacked on the lever, and the limiting portion of the lock buckle is an inverted buckle structure protruding in a direction parallel to the axial direction of the rotating shaft. The lever is provided with a limiting opening at a position corresponding to the limiting portion, and the end of the inverted buckle structure has a buckle portion extending in a direction perpendicular to the axial direction of the rotating shaft. The root of the inverted buckle structure is limited in the limiting opening, and the buckle portion at the end of the inverted buckle structure is buckled on the lever.

[0013] Optionally, a third rotating shaft hole cooperating with the rotating shaft is provided in the middle of the lock buckle, one end of the lock buckle is used to cooperate with the tripping device, and the other end is provided with a locking tooth, one end of the jump buckle is provided with a transmission rod hole for a hinged transmission rod, and the other end is provided with a third hinge hole cooperating with the hinge shaft, and the rotation of the lock buckle drives the locking teeth on it to engage or disengage with the buckle teeth of the jump buckle.

[0014] Optionally, a spring is also included, one end of which is connected to the housing of the circuit breaker, and the other end of the spring is connected to the contact support, and the contact support can rotate around the same rotating axis together with the lever and can move relative to the lever.

[0015] Optionally, the first rotating shaft hole of the contact support for cooperating with the rotating shaft is a waist-shaped hole, the length of the first rotating shaft hole is greater than the outer diameter of the rotating shaft, and the rotating shaft can slide along the length direction of the first rotating shaft hole.

[0016] Optionally, the rotating shaft is fixedly mounted on the housing of the circuit breaker, and the hinge shaft is linked to a lever.

[0017] Optionally, the contact support is located between the moving contact and the soft connection, the contact support is provided with a clamping hole, the moving contact is provided with a clamping boss, the clamping boss of the moving contact is clamped into the clamping hole of the contact support and protrudes from the bottom surface of the contact support, and the soft connection is welded to the clamping boss of the moving contact.

[0018] Optionally, the snap-in hole and the snap-in boss are waist-shaped.

[0019] Optionally, the contact support is an integrally formed structure made of a metal material; and / or, the lever is an integrally formed structure made of a metal material.

[0020] For the operating mechanism of the miniature circuit breaker of the present invention, the lever, the latch and the contact support share the same rotating shaft, and the toggle, the lever and the contact support share the same hinge shaft, which simplifies the structure of the operating mechanism. The two shafts assemble the components into one body, and the assembly connection method is simple and reliable, which is conducive to realizing automatic assembly.

[0021] In addition, the lever plays a role in bearing and limiting the contact support. The lever adopts a U-shaped structure that wraps the mounting end of the contact support, which has a simple structure, is easy to form and manufacture, is convenient for assembly, can effectively limit the offset of the contact support in the axial direction of the rotating shaft, and can also allow the contact support to rotate without obstruction in the limiting groove.

[0022] In addition, the contact support and the lever are not easily deformed by heat, thereby improving the reliability of the circuit breaker operation. In particular, the structures of the contact support and the lever are particularly simple, without complex structures, mainly realized by bending and opening slots and grooves, and can be realized by stamping and bending with metal materials, having the advantages of not being easily deformed by heat and being easy to manufacture. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the miniature circuit breaker of the present invention;

[0024] Figure 2 is a perspective view of a partial structure of the miniature circuit breaker of the present invention;

[0025] Figure 3 is an exploded view of a partial structure of the miniature circuit breaker of the present invention;

[0026] Figure 4 is a front view of a partial structure of the miniature circuit breaker of the present invention;

[0027] Figure 5 is a rear view of a partial structure of the miniature circuit breaker of the present invention;

[0028] Figure 6 is a schematic structural diagram of the lever of the present invention;

[0029] Handle 100; Transmission rod 110; Jumping buckle 200; Lever 300; Hinge shaft 310; Rotating shaft 320; Limit groove 330; Limit plate 340; Second rotating shaft hole 301; Second hinge hole 302; Fixing hole 303; Limit port 304; Lock 400; First return spring 410; Limiting part 420; Buckling part 421; Third rotating shaft hole 401; Lock teeth 402; Contact support 500; Installation end 510; Connection end 520; First rotating shaft hole 501; First hinge hole 502; Clamping hole 503; Fixed hook 530; Spring 540; Moving contact 600; Clamping boss 601; Flexible connection 610; Housing 700; Tripping device 800; Static contact 900. Detailed implementation mode

[0030] The following embodiments given in conjunction with the drawings further illustrate the specific implementation mode of the operating mechanism of the miniature circuit breaker of the present invention. The operating mechanism of the miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

[0031] As Figures 1-5 shown, the operating mechanism of the miniature circuit breaker of this embodiment includes a handle 100, a transmission rod 110, a jumping buckle 200, a lever 300, a lock 400 and a contact support 500 for carrying a moving contact 600 installed in a housing 700. The housing 700 includes a detachable base and an upper cover. A rotating shaft 320 is fixedly installed on the base of the housing 700. The lever 300, the lock 400 and the contact support 500 are pivotally installed on the rotating shaft 320. The jumping buckle 200, the lever 300 and the contact support 500 are hinged to a hinge shaft 310. The jumping buckle 200 is locked and cooperated with the lock 400. The handle 100 drives the jumping buckle 200 to rotate through the transmission rod 110. The jumping buckle 200 drives the lever 300 and the contact support 500 to rotate around the rotating shaft 320 through the hinge shaft 310. The contact support 500 drives the moving contact 600 to open and close with the static contact 900 to realize the opening and closing of the circuit breaker. When the circuit breaker is opened and closed, the jumping buckle 200 and the lock 400 always remain in the locked state. At this time, the operating mechanism can drive the contact 600 to contact and separate from the static contact 900. When a fault such as overload or short circuit occurs, the overload protection mechanism or the instantaneous protection mechanism in the miniature circuit breaker will trigger and drive the lock 400 to rotate, release the lock between the jumping buckle 200 and the lock 400, cause the circuit breaker to trip, and separate the moving contact 600 from the static contact 900. When the circuit breaker trips, the lock 400 rotates to release the lock with the jumping buckle 200, thereby driving the jumping buckle 200 to rotate.

[0032] The operating mechanism of the miniature circuit breaker in this embodiment simplifies the structure of the operating mechanism by sharing the same rotating shaft 320 among the lever 300, the latch 400, and the contact support 500, and sharing the same hinge shaft 310 among the trip latch 200, the lever 300, and the contact support 500. The two shared shafts assemble each component into one body, and the assembly connection method is simple and reliable, which is conducive to realizing automatic assembly. Inside the housing 700 of the miniature circuit breaker in this embodiment, there is a tripping device 800 (such as an electromagnetic release and a bimetal) corresponding to the latch 400 for tripping protection during circuit breaker failures, and there are also two wiring terminals for external wiring located on both sides. One wiring terminal is connected to the static contact 900, and the wiring board of the other wiring terminal is connected to the moving contact 600 through a flexible connection 610. An arc extinguishing chamber can also be provided for extinguishing the arc generated during the opening and closing of the moving contact 600 and the static contact 900.

[0033] The rotating shaft 320 in this embodiment is fixed and does not move with the lever 300 and the contact support 500. The hinge shaft 310 in this embodiment is movable and is linked with the lever 300. The linkage mode between the hinge shaft 310 and the lever 300 can be that the hinge shaft 310 is fixedly connected to the lever 300. For example, the hinge shaft 310 is a round shaft integrally connected to the lever 300, or the hinge shaft 310 is rotationally matched with the lever 300.

[0034] As Figures 2-3 shown, for the cooperation structure between the lever 300 and the contact support 500 in this embodiment, the lever 300 is provided with a limit groove 330 ( Figure 6 ) for restricting the axial movement of the contact support 500 along the rotating shaft 320. One end connection end 520 of the contact support 500 is connected to the moving contact 600, and the other end mounting end 510 of the contact support 500 is limited in the limit groove 330 of the lever 300. The lever 300 plays a role in bearing and limiting the contact support 500. Specifically, as Figure 6 shown, the lever 300 in this embodiment includes a connecting plate and two spaced limit plates 340. The two limit plates 340 are arranged in sequence along the axial direction of the rotating shaft 320. The connecting plate of the lever 300 is connected between the two limit plates 340 to enclose and form the limit groove 330, and the lever 300 is integrally U-shaped. The lever 300 is a wrapped structure for the mounting end 510 of the contact support 500, with a simple structure, easy to form and manufacture, convenient for assembly, and can effectively limit the offset of the contact support 500 in the axial direction of the rotating shaft 320, and can also allow the contact support 500 to rotate without obstruction in the limit groove 330.

[0035] As Figures 3-6As shown, the rotating shaft 320 penetrates through the mounting end 510 of the contact support 500 and the lever 300, and the hinge shaft 310 penetrates through the mounting end 510 of the contact support 500 and the lever 300. Correspondingly, a first rotating shaft hole 501 close to the moving contact 600 and a first hinge hole 502 far from the moving contact 600 are provided on the mounting end 510 of the contact support 500. Second hinge holes 302 and second rotating shaft holes 301 are provided on the two limiting plates 340 of the lever 300. The lever 300 is used to support the limiting plates 340 of the toggle 200 and the locking buckle 400 (i.e., Figure 6 the upper limiting plate 340 in Figure 6 ) is provided with a fixing hole 303 located between the second hinge hole 302 and the second rotating shaft hole 301, and a limiting port 304 is also provided on the side far from the connecting plate. In this embodiment, the linkage mode between the hinge shaft 310 and the lever 300 adopts a rotational fit. Hinge holes for rotational fit with the hinge shaft 310 are provided on the two limiting plates 340 of the lever 300 and the mounting end 510 of the contact support 500, so as to simplify the structure of the lever 300 and facilitate assembly.

[0036] As Figure 3 shown, the contact support 500 is a flat plate structure integrally formed of a metal material, which can resist high heat and will not deform. Optionally, the lever 300 in this embodiment for carrying the contact support 500 is also an integrally formed structure made of a metal material with high resistance to thermal deformation. The contact support 500 and the lever 300 in this embodiment are not easily deformed by heat, thereby improving the reliability of the circuit breaker operation. In particular, the structures of the contact support 500 and the lever 300 are very simple without complex structures, mainly realized by bending and opening slots, and can be realized by stamping and bending with metal materials, having the advantages of not being easily deformed by heat and being easy to manufacture. The hinge shaft 310 is also made of a metal material, which is not only not easily deformed by heat, but also the connection mode using the hinge shaft 310 is very convenient for automatic assembly. The toggle 200 is small and has a relatively simple structure and is not easily deformed. It can be made of a metal material or a heat-resistant plastic material.

[0037] As Figures 2-3As shown, the operating mechanism of the miniature circuit breaker of this embodiment also includes a first reset spring 410 for resetting the lock 400. The first reset spring 410 is sleeved on the rotating shaft 320, one end of which is connected to the fixing hole 303 of the lever 300, and the other end is connected to the fixing boss of the lock 400. When the circuit breaker is tripped, the trip buckle 200 is unlocked from the lock buckle 400. When the lock buckle 400 rotates around the rotating shaft 320, one end of the first reset spring 410 is limited by the fixing hole 303 on the lever 300, and the other end rotates with the fixing boss on the lock buckle 400, so that the first reset spring 410 forms a torsional reset force. After the circuit breaker is tripped, the first reset spring 410 completes energy storage; when the first reset spring 410 releases energy, it drives the lock buckle 400 to rotate, so that the lock buckle 400 is reset and re-locked with the trip buckle 200. Of course, as other embodiments, the first reset spring 410 can also be limited by the protrusion on the lever 300. The first reset spring can be a torsion spring, a compression spring, an elastic sheet, etc.

[0038] like Figures 2-3 As shown, the lock buckle 400 is provided with a limiting portion 420, and the limiting portion 420 of the lock buckle 400 cooperates with the lever 300 to limit the lock buckle 400 from moving along the axial direction of the rotating shaft 320, so as to prevent the lock buckle 400 from falling off after assembly. The jump buckle 200 and the lock buckle 400 are respectively stacked on the limiting plate 340 of the lever 300 for supporting the jump buckle 200 and the lock buckle 400, and the limiting portion 420 of the lock buckle 400 is an inverted buckle structure protruding in a direction parallel to the axial direction of the rotating shaft 320, and the limiting opening 304 of the lever 300 is correspondingly arranged with the limiting portion 420, and the end of the inverted buckle structure has a buckle portion 421 extending in a direction perpendicular to the axial direction of the rotating shaft 320, and the root of the inverted buckle structure is limited in the limiting opening 304, and the buckle portion 421 at the end of the inverted buckle structure is buckled on the lever 300. This structural design can limit the lock buckle 400 from deflecting in the axial direction of the rotating shaft 320, and does not affect the rotation of the lock buckle 400 on the lever 300. The middle part of the lock buckle 400 is provided with a third rotating shaft hole 401 that matches the rotating shaft 320. One end of the lock buckle 400 is used to match the tripping device 800, and the other end is provided with a locking tooth 402. One end of the jump buckle 200 is provided with a transmission rod hole for hinged transmission rod 110, and the other end is provided with a third hinge hole that matches the hinge shaft 310. The rotation of the lock buckle 400 drives the locking tooth 402 on it to engage or disengage with the buckle teeth of the jump buckle 200. When the circuit breaker is opened or closed, the lock teeth 402 of the lock buckle 400 engage with the buckle teeth of the trip buckle 200 to achieve locking cooperation; when the circuit breaker is tripped, the tripping device 800 pushes one end of the lock buckle 400 to rotate the lock buckle 400 until the lock teeth 402 are separated from the buckle teeth of the trip buckle 200 to achieve unlocking.

[0039] like Figure 1As shown, the operating mechanism of the miniature circuit breaker in this embodiment further includes a spring 540. One end of the spring 540 is connected to the housing 700 of the circuit breaker, and the other end of the spring 540 is connected to the contact support 500. Specifically, one end hook of the spring 540 is hung on the fixed shaft of the base, and the other end hook is hung on the fixed hook 530 of the contact support 500. The contact support 500 can rotate around the same rotating shaft 320 together with the lever 300 and can also move relative to the lever 300. The first rotating shaft hole 501 of the contact support 500 for cooperating with the rotating shaft 320 is an oblong hole, and the length of the first rotating shaft hole 501 is greater than the outer diameter of the rotating shaft 320, and the rotating shaft 320 can slide along the length direction of the first rotating shaft hole 501. The structure design of the first rotating shaft hole 501 of the contact support 500 for cooperating with the rotating shaft 320 in this embodiment can coaxialize the contact support 500 and the lever 300, that is, when the circuit breaker is in the initial state (i.e., the circuit breaker is in the open state), one of the semi-circular parts of the oblong hole on the contact support 500 is coaxial with the rotating shaft 320. The spring 540 in this embodiment provides overtravel and the separating force from the static contact 900 for the moving contact 600. The rotation radian of the contact support 500 is restricted by the cooperation of the rotating shaft 320 and the first rotating shaft hole 501, so that the contact support 500 and the lever 300 are separated as a whole when opening. When the circuit breaker is in the initial state (i.e., the circuit breaker is in the open state), the contact support 500 and the lever 300 are coaxially installed as a whole and can rotate synchronously; after the circuit breaker is closed, the contact support 500 can rotate relative to the lever 300 around the hinge shaft 310.

[0040] Optionally, the contact support 500 is integrally formed with or fixedly connected to the moving contact 600.

[0041] As Figures 2-5 shown, in this embodiment, the connection end 520 of the contact support 500 is located between the moving contact 600 and the flexible connection 610. A clamping hole 503 is provided on the connection end 520 of the contact support 500, a clamping boss 601 is provided on the moving contact 600, and the clamping boss 601 of the moving contact 600 is clamped into the clamping hole 503 of the contact support 500 and protrudes from the bottom surface of the contact support 500. The flexible connection 610 is welded to the clamping boss 601 of the moving contact 600. The flexible connection 610 is connected to the terminal through a wiring board. The pressure during the welding of the flexible connection 610 and the moving contact 600 will cause slight deformation of the clamping boss 601, and the deformed part of the clamping boss 601 can form a resisting fit with the bottom surface of the contact support 500, so that the moving contact 600 and the contact support 500 are reliably connected, improving the operation reliability. Preferably, the clamping hole 503 and the clamping boss 601 are oblong. Of course, as other embodiments, the clamping hole 503 and the clamping boss 601 can also be circular, square and other shapes.

[0042] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0043] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. The operating mechanism of a miniature circuit breaker, comprising a handle (100), a transmission rod (110), a tripping latch (200), a lever (300), a locking latch (400), and a contact support (500) for carrying a moving contact (600), characterized in that: The lever (300), the latch (400) and the contact support (500) are pivotally mounted on the rotating shaft (320). The toggle (200), the lever (300) and the contact support (500) are hinged to the hinge shaft (310). The toggle (200) is in locking cooperation with the latch (400). The handle (100) drives the toggle (200) to rotate through the transmission rod (110). The toggle (200) drives the lever (300) and the contact support (500) to rotate around the rotating shaft (320) through the hinge shaft (310).

2. The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: The lever (300) is provided with a limiting groove (330) for restricting the axial movement of the contact support (500) along the rotating shaft (320). One end of the contact support (500), i.e., the connecting end (520), is connected to the moving contact (600). The other end of the contact support (500), i.e., the mounting end (510), is limited within the limiting groove (330) of the lever (300).

3. The operating mechanism of the miniature circuit breaker according to claim 2, characterized in that: The lever (300) includes a connecting plate and two spaced limiting plates (340). The two limiting plates (340) are arranged in sequence along the axial direction of the rotating shaft (320). The connecting plate is connected between the two limiting plates (340) to enclose and form the limiting groove (330).

4. The operating mechanism of the miniature circuit breaker according to claim 2, characterized in that: The rotating shaft (320) penetrates through the mounting end (510) of the contact support (500) and the lever (300). The hinge shaft (310) penetrates through the mounting end (510) of the contact support (500) and the lever (300). The mounting end (510) of the contact support (500) is provided with a first rotating shaft hole (501) close to the moving contact (600) and a first hinge hole (502) far from the moving contact (600). The lever (300) is provided with a second hinge hole (302) and a second rotating shaft hole (301).

5. The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: It further includes a first return spring (410) for resetting the latch (400). The first return spring (410) is sleeved on the rotating shaft (320), with one end connected to the lever (300) and the other end connected to the latch (400).

6. The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: The latch (400) is provided with a limiting portion (420). The limiting portion (420) of the latch (400) is in limiting cooperation with the lever (300) to restrict the axial movement of the latch (400) along the rotating shaft (320).

7. The operating mechanism of the miniature circuit breaker according to claim 6, characterized in that: The latch (400) is laminated on the lever (300). The limiting portion (420) of the latch (400) is an inverted buckle structure protruding along the direction parallel to the axial direction of the rotating shaft (320). The lever (300) is provided with a limiting opening (304) corresponding to the limiting portion (420). The end of the inverted buckle structure has a buckle portion (421) extending along the direction perpendicular to the axial direction of the rotating shaft (320). The root of the inverted buckle structure is limited within the limiting opening (304), and the buckle portion (421) at the end of the inverted buckle structure buckles on the lever (300).

8. The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: The middle part of the latch (400) is provided with a third rotating shaft hole (401) for cooperating with the rotating shaft (320). One end of the latch (400) is used for cooperating with the tripping device (800), and the other end is provided with a locking tooth (402). One end of the toggle (200) is provided with a transmission rod hole for hinging the transmission rod (110), and the other end is provided with a third hinge hole for cooperating with the hinge shaft (310). The rotation of the latch (400) drives the locking tooth (402) thereon to engage or disengage with the buckling tooth of the toggle (200).

9. The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: It further includes a spring (540). One end of the spring (540) is connected to the housing (700) of the circuit breaker, and the other end is connected to the contact support (500). The contact support (500) can rotate around the same rotating shaft (320) together with the lever (300), and can also move relative to the lever (300).

10. The operating mechanism of the miniature circuit breaker according to claim 9, characterized in that: The first rotating shaft hole (501) for the contact support (500) to cooperate with the rotating shaft (320) is an oblong hole. The length of the first rotating shaft hole (501) is greater than the outer diameter of the rotating shaft (320), and the rotating shaft (320) can slide along the length direction of the first rotating shaft hole (501).

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