Installation structure of handle and reset spring and miniature circuit breaker

Abstract

The utility model discloses a mounting structure of a handle and a reset spring and a miniature circuit breaker, the handle comprises a handheld part and a rotating part, the rotating part comprises a body, a peripheral wall and a clamping bulge, the peripheral wall is C-shaped, and the peripheral wall is connected to a part of the periphery of the body so that the body and the peripheral wall form a mounting space; the peripheral wall comprises a first end and a second end, the clamping protrusion is connected with the body and spaced from the first end of the peripheral wall, the face, close to the first end, of the clamping protrusion is a first surface, and a clamping hook is arranged on the first surface; a clamping groove is formed in the peripheral wall and located near the second end of the peripheral wall. The ring part is arranged in the mounting space, the second foot part is clamped into the clamping groove, the first foot part is hooked by the clamping hook, and deformation always exists when the first foot part is hooked; the device has the advantage of being stable in structure.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment, and more particularly to a small circuit breaker, and more particularly to an installation structure of a handle and a reset spring. Background Art

[0002] The operating mechanism of the miniature circuit breaker includes a handle, and the user can close and open the miniature circuit breaker by turning the handle. In order to make the handle have a reset function, a reset torsion spring is often added between the handle and the housing of the miniature circuit breaker. When the user turns the handle (before reaching the closed state), after the external force is removed, the handle can return to the open position under the action of the reset torsion spring.

[0003] In order to realize the pre-installation of the reset torsion spring and the handle, the existing installation structure of the handle and the torsion spring is the same as disclosed in CN215869247U. Fig.11 As shown, it includes a handle body, an installation space is provided on the handle body, a notch is provided on the handle, a torsion spring includes two legs and a ring, the ring is provided in the installation space, and the two legs of the torsion spring extend from the notch (one of the legs is used to cooperate with the housing of the circuit breaker after being extended, so as to realize the reset structure of the handle); in order to ensure the installation stability of the torsion spring, two hooks are provided on the handle body at the notch, and the two legs of the torsion spring are hooked by the hooks. Since the two hooks are arranged opposite to each other, if one of the legs is accidentally touched, the leg will fall off from the hook, so the installation structure is extremely unstable.

[0004] Therefore, how to design a new installation structure of the handle and the return spring is a direction worthy of research. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a handle and reset spring installation structure and a small circuit breaker with better stability performance.

[0006] The present application provides: a mounting structure of a handle and a return spring, the return spring comprising a ring portion, a first foot portion and a second foot portion, the first foot portion and the second foot portion are connected through the ring portion and the first foot portion and the second foot portion extend from the ring portion toward the periphery, and the directions in which the first foot portion and the second foot portion extend are different; wherein the handle comprises a hand-held portion and a rotating portion, the rotating portion comprises a main body, a peripheral wall and a clamping protrusion, the peripheral wall is in a "C" shape, the peripheral wall is connected to a part of the periphery of the main body so that the main body and the peripheral wall form an installation space; the peripheral wall comprises a first end and a second end, the clamping protrusion is connected to the main body and is arranged at an interval with the first end of the peripheral wall, the surface of the clamping protrusion adjacent to the first end is a first surface, and a clamping hook is arranged on the first surface; a clamping groove is opened on the peripheral wall, and the clamping groove is located near the second end of the peripheral wall; the ring portion is arranged in the installation space, the second foot portion is clamped in the clamping groove, the first foot portion is hooked by the clamping hook and there is always a deformation amount when the first foot is hooked.

[0007] In some embodiments of the present application, the engaging protrusion is higher than the peripheral wall, and the hook is also higher than the peripheral wall; the hook includes an outer surface of the hook and an inner surface of the hook, and the first leg is hooked by the inner surface of the hook.

[0008] In some embodiments of the present application, a notch is formed where a peripheral wall is not provided on the periphery of the main body and where the snap-in protrusion is located, and the notch is the initial installation position of the first leg; the snap-in protrusion includes a top surface and a second surface located in the notch, and the outer surface of the hook is connected to the top surface. During installation, the first leg is deformed and passes over the second surface, the top surface, and the outer surface of the hook in sequence to reach the inner surface of the hook and is hooked.

[0009] In some embodiments of the present application, the second surface is connected to the top surface via a first guide surface, and the first guide surface is an inclined surface or an arc surface that gradually rises from the second surface toward the direction where the top surface is located.

[0010] In some embodiments of the present application, the outer surface of the hook is a second guide surface, and the second guide surface is an inclined surface or a curved surface whose top surface gradually descends in a direction away from the second surface.

[0011] A small circuit breaker comprises a housing, an operating mechanism and a contact system, wherein the operating mechanism is connected to the contact system and is used to drive the contact system to be connected and disconnected; wherein the operating mechanism comprises the above-mentioned mounting structure of a handle and a reset spring; the handle is rotatably connected to the housing, an abutment boss is provided on the housing, and a first foot abuts against the abutment boss to realize that a restoring force is generated between the reset spring and the housing after the handle is rotated.

[0012] In some embodiments of the present application, an arc extinguishing hood is provided in the shell, and a guide rib group is provided in the shell at the arc entrance of the arc extinguishing hood, the guide rib group includes at least three parallel guide ribs, a flow channel is formed between two adjacent guide ribs, and a conducting opening is opened on the guide rib, which connects all the flow channels.

[0013] In some embodiments of the present application, the operating mechanism also includes a connecting rod, a jump catch, a lock, a lock mounting piece and a contact support, and the contact support is rotatably connected to the shell through a hinge shaft; one end of the connecting rod is connected to the non-rotating center position of the handle, and the other end of the connecting rod is connected to the jump catch; the jump catch and the lock are both rotatably arranged with respect to the upper surface of the contact support, and the lock mounting piece is installed on the lower surface of the contact support, and the lock catch and the lock mounting piece are locked with each other and the locking position is located on one side of the contact support; an elastic foot is provided on the lock mounting piece, and the elastic foot is abutted against the inner wall of the shell to provide a restoring force to the lock.

[0014] In some embodiments of the present application, a magnetic release is also included, which includes a yoke, a coil, a frame, a moving iron core, a stationary iron core, a push rod and a compression spring. The moving iron core, the stationary iron core, the push rod and the compression spring are located inside the frame, and the coil is wound around the frame; the moving iron core is slidably arranged, the stationary iron core and the moving iron core are spaced apart, the push rod is arranged on the side of the moving iron core facing the stationary iron core, and the compression spring is arranged between the push rod and the stationary iron core; when the line is short-circuited, the moving iron core pushes the push rod to pass through the stationary iron core and acts on the lock to rotate it.

[0015] In some embodiments of the present application, a thermal release is also included, which includes a bimetallic strip and a pull rod, one end of the pull rod is connected to the lock, and the other end is located in the deformation direction of the bimetallic strip; when the line is overloaded, the bimetallic strip is bent by heat and deformed, driving the pull rod to move, thereby causing the lock to rotate.

[0016] With this structure, since the hook is arranged on the first end of the locking protrusion adjacent to the peripheral wall, and the slot is arranged near the second end of the peripheral wall, that is, the hook here is arranged in a direction away from the second end, then when the second leg of the torsion spring is inserted into the slot, the first leg is hooked by the hook, and there is a deformation amount on the first leg, the first leg and the hook will fit very tightly, which is more difficult to detach from the hook than the prior art. At the same time, the second leg is connected by means of the slot and is not easy to fall off. Therefore, the fit between the handle and the reset spring will be more stable than the structure of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 An exploded view of a circuit breaker according to an embodiment of the present application is shown;

[0019] Figure 2 An internal schematic diagram of a circuit breaker according to an embodiment of the present application is shown;

[0020] Figure 3 A schematic diagram of the structure of a magnetic release in a circuit breaker according to an embodiment of the present application is shown;

[0021] Figure 4 A schematic diagram of the structure of the operating mechanism in the circuit breaker of the embodiment of the present application is shown;

[0022] Figure 5 A schematic diagram of the assembly of a handle and a reset spring in a circuit breaker according to an embodiment of the present application is shown;

[0023] Figure 6 A side view of a handle in a circuit breaker according to an embodiment of the present application is shown;

[0024] Figure 7 A schematic diagram showing a first leg in an initial position when a reset spring is installed in a circuit breaker according to an embodiment of the present application;

[0025] Figure 8 A schematic diagram showing a situation in which the first leg of the reset spring in the circuit breaker of the embodiment of the present application is located on the first guide surface when the reset spring is installed;

[0026] Fig. 9 A schematic diagram showing a situation in which the first leg of the reset spring in the circuit breaker of the embodiment of the present application is located on the second guide surface when the reset spring is installed;

[0027] Fig.10 A schematic diagram showing a circuit breaker in an embodiment of the present application when a reset spring is hooked by a hook (installed in place);

[0028] Fig.11 The invention shows the assembly structure of the handle and the return spring in the prior art. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0034] like Figure 1-Figure 10 As shown, the embodiment of the present application is a small circuit breaker, which is also called an air switch, and includes an instantaneous tripping function (also called a short-circuit protection function) and an overload protection function.

[0035] The miniature circuit breaker can be a single-pole circuit breaker or a multi-pole circuit breaker, and the internal structure of the multi-pole circuit breaker is basically the same as that of the single-pole circuit breaker. Taking this embodiment as an example, a single-pole circuit breaker includes a housing, an operating mechanism, an electromagnetic system, a thermal release, an arc extinguishing system, a contact system 30 and two sets of terminal blocks 60.

[0036] The housing includes a base 11 and an upper cover 12. The base 11 and the upper cover 12 are fastened by riveting. Of course, in addition to riveting, snap-fit ​​connection, screw fastening, etc. can also be used. Moreover, it can be fastened by a single fastening method or by a combination of snap-fit ​​connection and riveting. Through the above fastening method, the base 11 and the upper cover 12 can be stably connected, so that the internal space is stable, which is conducive to the installation of the operating mechanism, the electromagnetic system, the thermal release, the arc extinguishing system, the contact system 30 and the two sets of terminal blocks 60.

[0037] The operating mechanism includes a handle 21, a connecting rod 22, a jumper 23, a lock 24, a lock mounting member 25, a main spring 26 and a contact support 27. Here, the contact support 27 is rotatably connected to the housing through a hinge shaft, and the main spring 26 is abutted between one side of the contact support 27 and the inner wall of the housing. The jumper 23 and the lock 24 are rotatably arranged on the upper surface of the contact support 27, and specifically, the jumper 23 and the lock 24 are respectively sleeved on two shafts on the contact support 27, thereby forming a rotatable connection. The handle 21 is rotatably connected to the housing, and the non-rotating center position of the handle 21 is connected to one end of the connecting rod 22, and the other end of the connecting rod 22 is connected to the jumper 23. The lock mounting member 25 is installed on the lower surface of the contact support 27, and the lock 24 and the lock mounting member 25 are locked and the locked position is located on one side of the contact support 27. The lock catch mounting member 25 is provided with an elastic foot 25a, which abuts against the inner wall of the housing to provide a restoring force to the lock catch 24. When the operating mechanism is in the closed state, the lock catch 24 and the trip catch 23 are engaged with each other so that the operating mechanism maintains a steady state. When the lock catch 24 rotates, the engagement between the lock catch 24 and the trip catch 23 is released, the steady state of the operating mechanism is broken, and the contact support 27 moves to the open position under the action of the main spring 26, that is, the operating mechanism performs the open operation.

[0038] The contact system 30 includes a moving contact and a stationary contact. The moving contact is arranged on the contact support 27. Under the action of the operating mechanism, the moving contact moves to achieve connection and disconnection with the stationary contact.

[0039] The thermal release includes a bimetallic strip 41 and a pull rod 42, one end of the pull rod 42 is connected to the lock buckle 24, and the other end of the pull rod 42 is in the deformation direction of the bimetallic strip 41. When the line is overloaded, the bimetallic strip 41 bends and deforms, driving the pull rod 42 to move, causing the lock buckle 24 to rotate (breaking the engagement with the trip buckle 23), thereby achieving tripping.

[0040] The magnetic release includes a yoke 71, a coil 72, a frame 73, a moving iron core 77, a static iron core 75, a push rod 76 and a compression spring 78. The moving iron core 77, the static iron core 75, the push rod 76 and the compression spring 78 are located inside the frame 73. The static iron core 75 partially extends beyond the frame 73. The coil 72 is wound around the frame 73, the moving iron core 77 is slidably arranged, the static iron core 75 and the moving iron core 77 are spaced apart, the compression spring 78 is arranged between the push rod 76 and the static iron core 75, and the push rod 76 is arranged on the side of the moving iron core 77 facing the static iron core 75. When a short circuit occurs in the line, the moving iron core 77 pushes the push rod to move, so that the push rod 76 passes through the static iron core 75. Since the magnetic release is located next to the lock buckle 24, the push rod can act on the lock buckle 24 to rotate it (breaking the engagement with the trip buckle 23), thereby achieving the opening of the gate.

[0041] The arc extinguishing system includes an arc extinguishing hood 51, an arc striking plate and other structures, and its function is to extinguish the arc generated when the contact system 30 is disconnected. There is an installation chamber for the arc extinguishing hood 51 on the shell, and a guide rib group is arranged at the front of the installation chamber (that is, the arc entrance of the arc extinguishing hood 51). Here, whether it is the upper cover 12 or the base 11, a guide rib group is arranged at this position, and the number of guide ribs 121 in the guide rib group here is six, and they are arranged parallel to each other. A flow channel 122 is formed between two adjacent guide ribs 121, and the arc gas can flow to the arc extinguishing hood 51 along the flow channel 122 and the guide rib 121. Here, the guide rib 121 is interrupted, that is, a conducting port 123 is opened on the guide rib 121, so that all the flow channels 122 can be connected to each other. The purpose of this is to make the path through which the arc gas flows longer, which is conducive to extinguishing the arc.

[0042] The two groups of connection terminals 60 respectively include a first connection terminal and a second connection terminal, which are used to be connected in the circuit. For example, the first connection terminal is connected to the load, and the second connection terminal is connected to the power supply.

[0043] The following focuses on the installation structure of the handle 21 and the return spring.

[0044] The return spring includes a ring portion 100a, a first leg 100b and a second leg 100c, wherein the first leg 100b and the second leg 100c are connected via the ring portion 100a, and the first leg 100b and the second leg 100c extend from the ring portion 100a toward the periphery, and the extending directions of the first leg 100b and the second leg 100c are different, that is, the first leg 100b and the second leg 100c are arranged at an angle.

[0045] The handle 21 includes a grip portion 21a and a rotating portion 21b, wherein the rotating portion 21b includes a body 21b1, a peripheral wall 21b2, and a clamping protrusion 21b3. A through hole is provided on the body 21b1, through which a rotation connection is formed with the rotating column of the housing. The peripheral wall 21b2 is in a "C" shape, and the peripheral wall 21b2 is connected to a part of the periphery of the body 21b1 (surrounding the installation space forming the installation ring portion 100a), and the peripheral wall 21b2 includes a first end 21b21 and a second end 21b22, and the clamping protrusion 21b3 is arranged beside the first end 21b21 of the peripheral wall 21b2, and the clamping protrusion 21b3 is arranged at a distance from the first end 21b21. In this way, since there is a portion of the periphery of the body 21b1 without the clamping protrusion 21b3 and the peripheral wall 21b2, this portion is equivalent to a notch 21b4, and the notch 21b4 is the initial installation position of the first leg 100b. The clamping protrusion 21b3 has a first surface 21b31 adjacent to the first end 21b21, and the first surface 21b31 is provided with a clamping hook 21b32, and the clamping hook 21b32 here faces the first end 21b21. Here, the engaging protrusion 21b3 includes a first surface 21b31, a hook inner surface 21b321, a hook outer surface 21b322, a top surface 21b33 and a second surface 21b34 which are connected in sequence. Thus, when the first foot 100b is installed (the second surface 21b34), the first foot 100b moves from the initial installation position through the second surface 21b34, the top surface 21b33, the hook outer surface 21b322 until it is hooked on the hook inner surface 21b321. Here, the first foot 100b will deform during the movement, so the first foot 100b will also have a deformation amount when it is finally hooked. The second foot 100c is always in the slot 21b5, and the slot 21b5 is located near the second end 21b22 of the peripheral wall 21b2.

[0046] Here, the hook 21b32 is higher than the peripheral wall 21b2, that is to say, the engaging protrusion 21b3 is higher than the peripheral wall 21b2. In order to facilitate the installation of the first foot 100b, a second guide surface and a first guide surface 21b35 are also provided. The first guide surface 21b35 here is connected between the second surface 21b34 and the top surface 21b33, and the first guide surface 21b35 is a gradually rising inclined surface, which gradually rises from the second surface 21b34 to the direction where the top surface 21b33 is located. The second guide surface is the outside of the hook 21b32, which is a gradually descending inclined surface, specifically, the top surface 21b33 gradually descends toward the direction away from the second surface 21b34. In this way, when installing the first foot 100b, the first foot 100b is more likely to gradually rise along the first guide surface 21b35, and then cross the top surface 21b33 and the first guide surface 21b35 until it is hooked on the inner surface 21b321 of the hook. Of course, the first guide surface and the second guide surface may also be designed as curved surfaces in addition to inclined surfaces.

[0047] After the handle 21 and the return spring are installed in this way (a relatively stable installation structure is formed between the two), they only need to be installed into the shell so that the first foot 100b abuts against the abutting boss 111 in the shell to complete the assembly of the handle 21 and the shell.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0049] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A mounting structure of a handle and a return spring, wherein the return spring comprises a ring portion, a first leg portion and a second leg portion, wherein the first leg portion and the second leg portion are connected via the ring portion and the first leg portion and the second leg portion extend from the ring portion toward the periphery, and the first leg portion and the second leg portion extend in different directions; characterized in that: The handle includes a gripping portion and a rotating portion, the rotating portion includes a body, a peripheral wall and a clamping protrusion, the peripheral wall is in a "C" shape, and the peripheral wall is connected to a portion of the periphery of the body so that the body and the peripheral wall form an installation space; the peripheral wall includes a first end and a second end, the clamping protrusion is connected to the body and is spaced apart from the first end of the peripheral wall, the surface of the clamping protrusion adjacent to the first end is the first surface, and a clamping hook is arranged on the first surface; a clamping groove is opened on the peripheral wall, and the clamping groove is located near the second end of the peripheral wall; the ring portion is arranged in the installation space, the second foot is clamped in the clamping groove, the first foot is hooked by the clamping hook and there is always a deformation amount when the first foot is hooked.

2. The mounting structure of a handle and a return spring according to claim 1, characterized in that: The clamping protrusion is higher than the peripheral wall, and the clamping hook is also higher than the peripheral wall; the clamping hook includes a clamping hook outer surface and a clamping hook inner surface, and the first foot is hooked by the clamping hook inner surface.

3. The mounting structure of a handle and a return spring according to claim 2, characterized in that: A notch is formed where there is no peripheral wall around the body and the snap-in protrusion, and the notch is the initial installation position of the first leg; the snap-in protrusion includes a top surface and a second surface located in the notch, and the outer surface of the hook is connected to the top surface. During installation, the first leg is deformed and passes over the second surface, the top surface, the outer surface of the hook in sequence to reach the inner surface of the hook and is hooked.

4. The mounting structure of a handle and a return spring according to claim 3, characterized in that: The second surface is connected to the top surface via a first guiding surface, and the first guiding surface is an inclined surface or an arc surface which gradually rises from the second surface toward the direction where the top surface is located.

5. The mounting structure of a handle and a return spring according to claim 3, characterized in that: The outer surface of the hook is a second guide surface, and the second guide surface is an inclined surface or an arc surface whose top surface gradually descends toward a direction away from the second surface.

6. A miniature circuit breaker, comprising a housing, an operating mechanism and a contact system, wherein the operating mechanism is connected to the contact system and is used to drive the contact system to be connected and disconnected; characterized in that: The operating mechanism includes a handle and a return spring installation structure as described in any one of claims 1-5; the handle is rotatably connected to the shell, an abutment boss is provided on the shell, and the first foot abuts against the abutment boss to generate a restoring force between the return spring and the shell after the handle rotates.

7. A miniature circuit breaker according to claim 6, characterized in that: An arc extinguishing hood is arranged in the shell, and a guide rib group is arranged at the arc entrance of the arc extinguishing hood. The guide rib group includes at least three parallel guide ribs, and a flow channel is formed between two adjacent guide ribs. The guide ribs are provided with a conducting opening, and the conducting opening enables all the flow channels to be connected.

8. A miniature circuit breaker according to claim 6, characterized in that: The operating mechanism also includes a connecting rod, a jump catch, a lock catch, a lock catch mounting piece and a contact support, wherein the contact support is rotationally connected to the shell through a hinge shaft; one end of the connecting rod is connected to the non-rotating center position of the handle, and the other end of the connecting rod is connected to the jump catch; the jump catch and the lock catch are both rotatably arranged with the upper surface of the contact support, and the lock catch mounting piece is installed on the lower surface of the contact support, and the lock catch and the lock catch mounting piece are locked with each other and the locking position is located on one side of the contact support; an elastic foot is provided on the lock catch mounting piece, and the elastic foot is abutted against the inner wall of the shell to provide a restoring force to the lock catch.

9. A miniature circuit breaker according to claim 8, characterized in that: It also includes a magnetic release, which includes a yoke, a coil, a frame, a moving iron core, a static iron core, a push rod and a compression spring. The moving iron core, the static iron core, the push rod and the compression spring are located in the frame, and the coil is wound on the frame; the moving iron core is slidably arranged, the static iron core and the moving iron core are spaced apart, the push rod is arranged on the side of the moving iron core facing the static iron core, and the compression spring is arranged between the push rod and the static iron core; when the line is short-circuited, the moving iron core pushes the push rod to pass through the static iron core and act on the lock to rotate it.

10. A miniature circuit breaker according to claim 9, characterized in that: It also includes a thermal release, which includes a bimetallic strip and a pull rod, one end of the pull rod is connected to the lock, and the other end is located in the deformation direction of the bimetallic strip; when the line is overloaded, the bimetallic strip is bent by heat and deformed, driving the pull rod to move, thereby causing the lock to rotate.

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