Tripping system and circuit breaker

Abstract

The utility model discloses a tripping system and a circuit breaker, and an armature is provided with a first position which is not attracted and a second position which is attracted by a static iron core. The first end of the reset spring is connected to the armature, and the second end of the reset spring is connected to the armature support or the static iron core and used for driving the attracted armature to return to the first position. A first limiting bulge is arranged on the transfer groove, and is used for preventing the transfer bulge from falling off from a notch of the transfer groove when the armature is located; the side plate part is provided with a second limiting protrusion, the armature is provided with a third limiting protrusion, when the armature is located at the first position, the second limiting protrusion is located on one side of the third limiting protrusion, and the distance between the second limiting protrusion and the third limiting protrusion is smaller than the distance between the switching protrusion and a notch of the switching groove so that the switching protrusion can be prevented from falling off from the notch of the switching groove. The third limiting protrusion abuts against the two side plate parts and is used for preventing the armature from being excessively reset under the action of the reset spring. The armature has the characteristic that the armature is more stable.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a circuit breaker, specifically a tripping system of the circuit breaker. Background Art

[0002] In order to achieve instantaneous protection, existing molded case circuit breakers often use electromagnetic releases, and the electromagnetic releases used are basically snap-on electromagnetic releases.

[0003] This snap-on electromagnetic release includes an armature, an armature bracket, a static iron core, and a main circuit conductor. The static iron core, the armature bracket, and the main circuit conductor are often riveted together with rivets. The armature is swingably set on the armature bracket, and the main circuit conductor is inserted between the armature and the static iron core. When a short circuit occurs in the main circuit, the static iron core will generate an attraction to the armature, causing the armature to swing, and then the armature is used to push the traction rod of the operating mechanism to achieve release.

[0004] There are two main ways to design the swing of the armature and the armature bracket in the existing snap-on electromagnetic release. One is to use an additional shaft to be inserted into the armature and the armature bracket, and then use a retaining spring or riveting method to tighten the two ends of the shaft to ensure a stable swing connection. However, this method has more manufacturing processes and requires additional shaft insertion, which is extremely inconvenient. For example, the structure disclosed in CN215955217U adopts this shaft insertion form. Another way is to form two slots on the armature bracket, and the two ends of the armature have protrusions, which can be pressed against the slots to form a swing. This method has fewer parts and is easy to assemble, but the protrusions are easy to fall off from the slots, which is extremely inconvenient. For example, CN213459622U adopts this slot and protrusion form.

[0005] Therefore, how to design a tripping system that can reduce the risk of armature falling off as much as possible is a direction worthy of research. Summary of the invention

[0006] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a tripping system and a circuit breaker that can reduce the risk of armature falling off.

[0007] The present application provides: a tripping system, which includes an armature bracket, an armature, a static iron core, a main circuit conductor and a reset spring; the armature bracket includes a main body and two side plate parts, and the static iron core, the main circuit conductor and the main body are tightly connected; the two side plate parts of the armature bracket are provided with transfer grooves, and the two ends of the armature are provided with transfer protrusions, and the transfer protrusions are arranged in the transfer grooves to enable the armature to form a rotational connection with the armature bracket; the armature has a first position when it is not attracted and a second position after being attracted by the static iron core; the first end of the reset spring is connected to the armature, and the second end is connected to the armature bracket or the static iron core, which is used to drive the armature after being attracted Return to the first position; a first limiting protrusion is provided on the transfer groove, and the first limiting protrusion is used to prevent the transfer protrusion from falling off from the notch of the transfer groove when the armature is in the second position; a second limiting protrusion is provided on the side plate portion, and a third limiting protrusion is provided on the armature, when the armature is in the first position, the second limiting protrusion is located on one side of the third limiting protrusion, and the distance between the two is smaller than the distance from the transfer protrusion to the notch of the transfer groove, so as to prevent the transfer protrusion from falling off from the notch of the transfer groove; when the armature is in the first position, the third limiting protrusion is abutted against the two side plate portions, so as to prevent the armature from being over-reset under the action of the reset spring.

[0008] For the armature, it mainly has two positions, one is the first position where it is not attracted, and the other is the second position after being attracted by the static iron core. The setting of the first limiting protrusion can prevent the transfer protrusion from falling off from the notch of the transfer groove when the armature is in the second position, thereby preventing the armature from falling off. The setting of the second limiting protrusion and the third limiting protrusion can prevent the transfer protrusion from falling off from the notch of the transfer groove when the armature is in the first position, thereby preventing the armature from falling off. By setting limiting structures at both positions, the armature can be effectively guaranteed to be stably set and the risk of falling off can be reduced. At the same time, the design of the third limiting protrusion abutting against the two side plate parts is adopted. When the armature returns to the first position, the third limiting protrusion can be used to abut against the two side plate parts to prevent excessive return, thereby further ensuring the stability of the armature.

[0009] In some embodiments of the present application, a recessed area is provided on the side plate portion, and the adapter groove, the first limiting protrusion and the second limiting protrusion are all part of the recessed area.

[0010] By adopting this structure, these structures are all arranged in a recessed area, making processing and forming more convenient, and these structures can be formed only by stamping.

[0011] In some embodiments of the present application, at least two hook portions are provided on the armature bracket, and there is a distance between the hook portions in both the height direction and the length direction, and the hook portion is used to cooperate with the second end of the return spring.

[0012] With this structure, the design of multiple hook parts can achieve the effect of adjusting the instantaneous tripping parameters by changing the elastic force of the return spring (the resistance to the armature when it is attracted).

[0013] In some embodiments of the present application, a hanging hole is provided on the armature, and the first end of the reset spring is hung on the hanging hole; the wall thickness of the hanging hole in the first direction is smaller than the wall thickness in the other directions, and the wall thickness of the hanging hole in the first direction is adapted to the parameters of the first end of the reset spring to ensure that the first end of the reset spring is stably located on the wall of the hanging hole in the first direction.

[0014] By adopting this wall thickness design, the reset spring can be firmly located on the wall of the hanging hole in the first direction and will not be misplaced to the walls of the hanging hole in other directions.

[0015] In some embodiments of the present application, the armature includes a flat plate portion, a reset spring suspension portion and an actuating portion, the transfer protrusion and the third limit protrusion are both part of the flat plate portion, the reset spring suspension portion is used to cooperate with the first end of the reset spring, and the actuating portion is used to cooperate with the operating mechanism of the circuit breaker.

[0016] With this structure, the flat plate portion, the transfer protrusion and the third limit protrusion are all part of the flat plate portion, so that the flat plate portion, the transfer protrusion and the third limit protrusion can be directly formed by stamping, reducing the bending process as much as possible, and making the processed dimensions of each part relatively accurate.

[0017] In some embodiments of the present application, the main circuit conductor includes a wiring segment, a U-shaped bending segment and a fixed segment. The fixed segment is connected to the wiring segment through the U-shaped bending segment. The fixed segment is used to be fixed to the base of the circuit breaker, and the wiring segment is used to connect an external wire. The wiring segment is a straight plate-shaped structure, and a right angle is formed at the connection between the wiring segment and the U-shaped bending segment.

[0018] A right angle is formed at the connection between the wiring section and the U-shaped bending section, so that the current transformer can be installed close to this connection. This design makes the main circuit conductor more versatile and can be used in both thermal magnetic circuit breakers and electronic circuit breakers.

[0019] In some embodiments of the present application, a bimetallic strip is also included, and the bimetallic strip, the main circuit conductor, the static iron core, and the main body are arranged in sequence and are tightly connected.

[0020] In some embodiments of the present application, a first positioning protrusion is provided on the static iron core, and a first positioning hole cooperating with the first positioning protrusion is provided on the main body; or / and, a second positioning hole is provided on the static iron core, and a second positioning protrusion cooperating with the second positioning hole is provided on the main circuit conductor; and / or, a gasket is also provided between the bimetallic strip and the main circuit conductor to form a gap between the bimetallic strip and the main circuit conductor.

[0021] With this structure, the design of the first positioning protrusion and the first positioning hole can form a positioning between the static iron core and the armature bracket, which is convenient for fastening. The design of the second positioning hole and the second positioning protrusion can form a positioning between the static iron core and the main circuit conductor, which is convenient for fastening. The design of the gasket can form a gap between the bimetallic strip and the main circuit conductor.

[0022] A circuit breaker comprises a base and an operating mechanism. The base is provided with at least two pole spaces. Each pole space is provided with the above-mentioned tripping system.

[0023] In some embodiments of the present application, the operating mechanism includes a traction rod and a frame, the frame is fixed in one of the pole spaces, and the traction rod spans all the pole spaces; the traction rod is rotatably connected to the frame through an articulated shaft; the articulated shaft is located in the pole space where the frame is set, and both ends of the articulated shaft do not exceed the pole space.

[0024] With this structure, the articulated shaft is arranged in a polar space and does not extend beyond other spaces, thus avoiding electrical breakdown caused by the articulated shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A schematic diagram of the structure of a circuit breaker according to an embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram showing the internal structure of a circuit breaker according to an embodiment of the present application is shown;

[0028] Figure 3 A partial enlarged diagram of the position relationship between the hinge shaft and the base in the circuit breaker of the embodiment of the present application is shown;

[0029] Figure 4 A schematic diagram showing a state when a tripping system in a circuit breaker according to an embodiment of the present application is in a first position;

[0030] Figure 5 A schematic diagram showing a state when the tripping system in the circuit breaker of the embodiment of the present application is in the second position;

[0031] Figure 6 A schematic diagram of the structure of an armature bracket in a circuit breaker according to an embodiment of the present application is shown;

[0032] Figure 7 A schematic diagram of the structure of the armature in the circuit breaker of the embodiment of the present application is shown;

[0033] Figure 8 A schematic diagram showing the structure of the main circuit conductor in the circuit breaker of the embodiment of the present application is shown;

[0034] Fig. 9 A cross-sectional view showing the fastening connection of the main circuit conductor, the static iron core, the armature bracket, and the double gold sheet in the circuit breaker according to the embodiment of the present application. Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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

[0040] like Figure 1-Figure 9 As shown, an embodiment of the present application is a circuit breaker, which includes a housing, an operating mechanism 2, a contact system, an arc extinguishing system and a tripping system.

[0041] The housing includes a base 1 and an upper cover. The base 1 and the upper cover are fastened by bolts, and three pole spaces 11 arranged in sequence are arranged on the base 1, and each pole space 11 is provided with a contact system, an arc extinguishing system, and a tripping system.

[0042] The operating mechanism 2 includes a frame 22, a traction rod 21, a handle, a lever, a main tension spring, an upper connecting rod, a lower connecting rod, a jump buckle, a lock buckle and a re-buckle. The connection relationship between the various components of the operating mechanism 2 here is common knowledge in the field and will not be repeated here. The frame 22 here is fastened in the middle pole space 11 and is fixed by bolt fastening. The traction rod 21 is hinged to the frame 22 using an articulated shaft 23. The articulated shaft 23 here is located in the middle pole space 11 and does not extend into the two adjacent pole spaces 11. The purpose of doing so is to avoid electrical breakdown of the adjacent two poles due to the articulated shaft 23. The traction rod 21 spans all the pole spaces 11. Such a setting can facilitate the tripping systems of all pole spaces 11 to drive the traction rod 21 to move when abnormalities are detected in their respective main circuits, thereby realizing the opening operation of the operating mechanism 2.

[0043] Here, since the tripping system structure in each pole space 11 is the same, one of them is taken as an example for introduction.

[0044] The tripping system here includes an armature bracket 31 , an armature 32 , a static iron core 34 , a main circuit conductor, a reset spring 35 , and a bimetallic strip 37 .

[0045] The assembly structure formed by the armature bracket 31, the armature 32, the static iron core 34, the main circuit conductor, and the reset spring 35 can realize instantaneous protection, also called short-circuit protection, that is, when a short circuit occurs in the main circuit, the traction rod 21 is driven to operate to realize the opening operation of the operating mechanism 2. The specific structures of these components are as follows:

[0046] The main circuit conductor includes a wiring segment 361, a U-shaped bending segment 362 and a fixed segment 363, and the fixed segment 363 is connected to the wiring segment 361 through the U-shaped bending segment 362. The fixed segment 363 here is used to be fixed to the base 1 of the circuit breaker, and the wiring segment 361 is used to connect the external wire and also to be fixed to the base 1 of the circuit breaker, so that the main circuit conductor can be firmly fixed on the base 1. Here, the connection between the wiring segment 361 and the U-shaped bending segment 362 forms a right angle A. Such a design allows the current transformer to be installed close to this connection. Such a design makes this main circuit conductor more versatile and can be used in both thermal magnetic circuit breakers and electronic circuit breakers.

[0047] The armature support 31 includes a main body 311 and two side plates 312. The two side plates 312 are disposed on both sides of the main body 311. The main body 311 and the side plates 312 are formed by stamping and then bending. Both side plates 312 are provided with transfer grooves 312a, where the transfer grooves 312a are used for the armature 32 to rotate.

[0048] The static iron core 34 is a U-shaped structure, and the hollow part surrounds the main circuit conductor (specifically, a part of the U-shaped bending section 362 of the main circuit conductor). The main body 311, the static iron core 34, and the main circuit conductor are fixed by riveting. Of course, the riveting here can also be replaced by bolt connection, as long as the stable connection of the three can be guaranteed. In order to facilitate the positioning between these parts, a first positioning protrusion 341 is provided on the static iron core 34, and a first positioning hole 3111 is provided at a corresponding position of the main body 311, and the first positioning hole 3111 cooperates with the first positioning protrusion 341. A second positioning hole 342 is provided on the static iron core 34, and a second positioning protrusion 3621 is provided at a corresponding position on the main circuit conductor, and the second positioning protrusion 3621 cooperates with the second positioning hole 342.

[0049] The armature 32 includes a flat plate portion 321, a return spring suspension portion 322 and an actuating portion 323. The flat plate portion 321 here is a straight plate, which includes two laterally protruding transfer protrusions 321a (the transfer protrusions 321a are actually a part of the flat plate portion 321) and two third limiting protrusions 321b. The third limiting protrusions 321b correspond to the transfer protrusions 321a one by one, and are arranged at intervals. Here, the return spring suspension portion 322 is used to hook the first end of the return spring 35, so that the return spring can pull the armature 32 back to its original position. The actuating portion 323 corresponds to the traction rod 21, and drives the traction rod 21 to move when the armature 32 rotates (when the main circuit is short-circuited).

[0050] The transfer protrusion 321a corresponds to the transfer groove 312a one by one, and the armature 32 can be rotatably connected to the armature bracket 31 by setting the transfer protrusion 321a in the transfer groove 312a. Here, it can be divided into a first position and a second position according to the position of its movement. The first position here refers to the position where the armature 32 is not attracted (when the main circuit is normal), and the second position here refers to the position where the armature 32 is attracted by the static iron core 34 and is attracted to the static iron core 34 (when the main circuit is short-circuited). In order to prevent the armature 32 from detaching from the armature bracket 31 when it is in the second position, a first limiting protrusion 312b is provided on the transfer groove 312a, and the first limiting protrusion 312b is located on one side of the transfer protrusion 321a. Specifically, when the armature 32 is in the second position, the first limiting protrusion 312b is located on one side of the transfer protrusion 321a, which can prevent the transfer protrusion 321a from falling off from the notch of the transfer groove 312a, thereby preventing the armature 32 from falling off. In order to prevent the armature 32 from detaching from the armature bracket 31 when the armature 32 is in the first position, a second limiting protrusion 312c is provided on the side plate portion 312, wherein the number of the second limiting protrusions 312c is the same as the number of the third limiting protrusions 321b and corresponds one to one. When the armature 32 is in the first position, the second limiting protrusion 312c is located on one side of the third limiting protrusion 321b, and the distance between the second limiting protrusion 312c and the third limiting protrusion 321b is less than the distance from the transfer protrusion 321a to the notch of the transfer groove 312a, thereby preventing the transfer protrusion 321a from falling off from the notch of the transfer groove 312a, thereby preventing the armature 32 from falling off. The third limiting protrusion 321b and the two side plates 312 here offset each other when the armature 32 is in the first position. Specifically, when the armature 32 returns under the action of the return spring 35, the third limiting protrusion 321b and the side plates 312 can be used to prevent excessive resetting.

[0051] In order to facilitate the processing and manufacturing of these structures, a recessed area 3120 is formed on the side panel portion 312, and the adapter groove 312a, the first limiting protrusion 312b and the second limiting protrusion 312c are all part of the recessed area 3120. Such a recessed area 3120 allows these structures to be formed by stamping, and then the side panel portion 312 and the main body portion 311 can be bent.

[0052] The second end of the reset spring 35 can be connected to the static iron core 34 or to the armature bracket 31. In the embodiment, the second end of the reset spring 35 is connected to the armature bracket 31. In order to achieve adjustable instantaneous protection parameters, also called magnetic tripping parameter adjustment, two hook parts 313 are provided on the armature bracket 31. The two hook parts 313 are spaced apart in both the height direction and the length direction, so that the magnetic adjustable effect can be achieved by changing the length (elastic force) of the reset spring 35. Of course, the hooks here can also be set to multiple to achieve more gears to choose from.

[0053] The reset spring hanging part 322 is provided with a hanging hole 322a, which is used to hook the first end of the reset spring 35. Here, the wall thickness of the hanging hole 322a in the first direction S1 is less than the wall thickness in other directions. The wall thickness here can be understood as the distance from the hole wall of the hanging hole 322a to each end face of the reset spring hanging part 322. Since the wall thickness of the hanging hole 322a in the first direction S1 is exactly matched with the parameters of the first end of the reset spring 35, the wall thickness in other directions will be greater than the parameters of the first end, and the first end of the reset spring can be stably located on the wall of the hanging hole 322a in the first direction S1 to prevent dislocation. The parameters of the first end of the reset spring here can be understood as the size of the first end when the reset spring is normally hung.

[0054] The assembly structure formed by the main circuit conductor and the bimetallic strip 37 can realize overload protection, that is, when the main circuit is overloaded, the traction rod 21 is driven to operate, thereby realizing the opening operation of the operating mechanism 2.

[0055] The bimetallic strip 37 is fixed to the main circuit conductor, specifically, the main body 311, the static iron core 34, the main circuit conductor, and the bimetallic strip 37 are arranged in sequence and then fixed by riveting. Here, a gasket 38 is also arranged between the bimetallic strip 37 and the main circuit, and the gasket 38 is also passed through by the rivet used for riveting.

[0056] Although the above structure takes a three-pole circuit breaker as an example, it is not limited to a three-pole circuit breaker and can also be applied to a two-pole or a four-pole circuit breaker.

[0057] 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.

[0058] 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 tripping system, characterized in that: The invention comprises an armature bracket, an armature, a static iron core, a main circuit conductor and a reset spring; the armature bracket comprises a main body and two side plates, and the static iron core, the main circuit conductor and the main body are tightly connected; a transfer groove is arranged on the two side plates of the armature bracket, and transfer protrusions are arranged at both ends of the armature, and the transfer protrusions are arranged in the transfer groove to form a rotational connection between the armature and the armature bracket; the armature has a first position where it is not attracted and a second position where it is attracted by the static iron core; the first end of the reset spring is connected to the armature, and the second end is connected to the armature bracket or The first limiting protrusion is arranged on the side plate part, and the third limiting protrusion is arranged on the armature. When the armature is in the first position, the second limiting protrusion is located on one side of the third limiting protrusion, and the distance between the second limiting protrusion and the third limiting protrusion is less than the distance from the connecting protrusion to the notch of the connecting groove, so as to prevent the connecting protrusion from falling off from the notch of the connecting groove. When the armature is in the first position, the third limiting protrusion abuts against the two side plate portions to prevent the armature from being over-reset under the action of the reset spring.

2. A tripping system according to claim 1, characterized in that: The side plate portion is provided with a recessed area, and the adapter groove, the first limiting protrusion and the second limiting protrusion are all part of the recessed area.

3. A tripping system according to claim 1, characterized in that: At least two hook parts are arranged on the armature bracket, and there is a distance between the hook parts in the height direction and the length direction. The hook part is used to cooperate with the second end of the return spring.

4. A tripping system according to claim 1, characterized in that: A hanging hole is provided on the armature, and the first end of the reset spring is hung on the hanging hole; the wall thickness of the hanging hole in the first direction is smaller than the wall thickness in other directions, and the wall thickness of the hanging hole in the first direction is adapted to the parameters of the first end of the reset spring to ensure that the first end of the reset spring is stably located on the wall of the hanging hole in the first direction.

5. A tripping system according to claim 1, characterized in that: The armature includes a flat plate portion, a reset spring suspension portion and an actuating portion. The transfer protrusion and the third limiting protrusion are both part of the flat plate portion. The reset spring suspension portion is used to cooperate with the first end of the reset spring, and the actuating portion is used to cooperate with the operating mechanism of the circuit breaker.

6. A tripping system according to claim 1, characterized in that: The main circuit conductor includes a wiring section, a U-shaped bending section and a fixed section. The fixed section is connected to the wiring section through the U-shaped bending section. The fixed section is used to be fixed to the base of the circuit breaker, and the wiring section is used to connect to the external wire. The wiring section is a straight plate-shaped structure, and the connection between the wiring section and the U-shaped bending section forms a right angle.

7. A tripping system according to claim 1, characterized in that: It also includes a bimetallic sheet, wherein the bimetallic sheet, a main circuit conductor, a static iron core and a main body are arranged in sequence and are tightly connected.

8. A tripping system according to claim 7, characterized in that: A first positioning protrusion is provided on the static iron core, and a first positioning hole matching with the first positioning protrusion is provided on the main body; or / and, a second positioning hole is provided on the static iron core, and a second positioning protrusion matching with the second positioning hole is provided on the main circuit conductor; and / or, a gasket is also provided between the bimetallic strip and the main circuit conductor to form a gap between the bimetallic strip and the main circuit conductor.

9. A circuit breaker, comprising a base and an operating mechanism, wherein at least two pole spaces are arranged on the base; characterized in that: A tripping system as described in any one of claims 1 to 8 is arranged in each pole space.

10. A circuit breaker according to claim 9, characterized in that: The operating mechanism includes a traction rod and a frame, the frame is fixed in one of the pole spaces, and the traction rod spans all the pole spaces; the traction rod is rotatably connected to the frame through an articulated shaft; the articulated shaft is located in the pole space where the frame is set, and both ends of the articulated shaft do not exceed the pole space.

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