A DC circuit breaker

Abstract

This invention discloses a DC circuit breaker, belonging to the field of low-voltage electrical appliance technology. The DC circuit breaker includes a two-pole circuit breaker, comprising a first breaking unit and a second breaking unit. The first breaking unit includes a first stationary contact, a first moving contact, and a first coil, with a first end of the first coil electrically connected to the first stationary contact. The second breaking unit includes a second stationary contact, a second moving contact, and a second coil, with a first end of the second coil electrically connected to the second stationary contact and a second end of the second coil electrically connected to the second end of the first coil. The DC circuit breaker provided by this invention effectively reduces costs and shortens the current-carrying circuit length, thereby reducing the temperature rise and power consumption of the DC circuit breaker and ensuring safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a direct current circuit breaker. BACKGROUND

[0002] Low-voltage circuit breaker (formerly known as automatic switch) is a kind of switch electrical apparatus which can not only connect and break normal load current and overload current, but also connect and break short-circuit current. In addition to the control function in the circuit, low-voltage circuit breaker also has certain protection function, such as overload, short-circuit, under-voltage and leakage protection.

[0003] At present, in the direct current power supply system, most of the multi-pole direct current circuit breakers on the market adopt single-pole assembly method, that is, a plurality of single-pole circuit breakers are used in series. For example, two-pole circuit breaker, usually, the wiring terminal of single-pole circuit breaker is electrically connected with busbar to realize the series connection of two single-pole circuit breakers. The electrical connection of wiring terminal and busbar will aggravate the temperature rise and power consumption of the product, and there is a safety hazard. SUMMARY

[0004] The purpose of the present application is to provide a direct current circuit breaker which effectively reduces the temperature rise and power consumption of the product and ensures safety.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The present application provides a direct current circuit breaker, which comprises a two-pole circuit breaker, and the two-pole circuit breaker comprises:

[0007] A first breaking unit comprising a first static contact, a first moving contact and a first coil, wherein the first end of the first coil is electrically connected with the first static contact;

[0008] A second breaking unit comprising a second static contact, a second moving contact and a second coil, wherein the first end of the second coil is electrically connected with the second static contact, and the second end of the second coil is electrically connected with the second end of the first coil.

[0009] Optionally, the two-pole circuit breaker further comprises a partition plate, and the first breaking unit and the second breaking unit are arranged on the two sides of the partition plate.

[0010] Optionally, an open slot is arranged on the partition plate.

[0011] The two-pole circuit breaker further comprises a first short-circuit conductor, wherein the first end of the first short-circuit conductor is electrically connected with the second end of the first coil, and the second end of the first short-circuit conductor passes through the open slot and is electrically connected with the second end of the second coil.

[0012] Optionally, the first coil, the first short-circuit conductor and the second coil constitute a short-circuit tripping module.

[0013] The partition plate is provided with a detachable sealing plate, which is used to close the opening slot after the first short-circuit conductor of the short-circuit tripping module is loaded into the opening slot.

[0014] Optionally, the opening slot is arranged at a first end of the partition plate along a first direction.

[0015] Optionally, the partition plate is provided with a wire passing hole, and the second end of the first coil is provided with an extension part which passes through the wire passing hole and is in contact with the second end of the second coil.

[0016] Optionally, the second end of the first coil is bent towards the partition plate to form the extension part.

[0017] Optionally, the wire passing hole is arranged at a first end of the partition plate along a first direction.

[0018] Optionally, the first moving contact and the second moving contact are respectively electrically connected with one terminal, and the terminal connected with the first moving contact and the terminal connected with the second moving contact are both arranged at a second end of the two-pole circuit breaker along the first direction.

[0019] Optionally, the two-pole circuit breaker is provided with two, the two two-pole circuit breakers are arranged side by side, and the handles of the two two-pole circuit breakers are spliced.

[0020] Optionally, the two-pole circuit breaker is provided with two, the two two-pole circuit breakers are arranged side by side, and the handles of the two two-pole circuit breakers are spliced.

[0021] Beneficial effects:

[0022] The DC circuit breaker provided by the application connects the first breaking unit and the second breaking unit in series through the electrical connection between the second end of the first coil and the second end of the second coil, and then forms a two-pole circuit breaker. Compared with the traditional series connection mode, the bus bar is saved, and when the DC circuit breaker is closed, the first moving contact is in contact with the first stationary contact, the second moving contact is in contact with the second stationary contact, the current flows through the first moving contact, the first stationary contact, the first coil, the second coil, the second stationary contact and the second moving contact in turn, the length of the current-carrying loop is shortened, the temperature rise and power consumption of the DC circuit breaker are reduced, and safety is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a partial structure schematic view of the two-pole circuit breaker provided by the first embodiment of the application.

[0024] Figure 2 is another partial structural schematic view of the two-pole circuit breaker provided by Embodiment One of the present application;

[0025] Figure 3 is a structural schematic view of the two-pole circuit breaker provided by Embodiment One of the present application;

[0026] Figure 4 is a structural schematic view of one implementation of the first coil provided by Embodiment One of the present application;

[0027] Figure 5 is a structural schematic view of one implementation of the partition provided by Embodiment One of the present application;

[0028] Figure 6 is a structural schematic view of another implementation of the first coil provided by Embodiment One of the present application;

[0029] Figure 7 is a structural schematic view of another implementation of the partition provided by Embodiment One of the present application;

[0030] Figure 8 is a structural schematic view of the extension passing through the wire hole provided by Embodiment One of the present application;

[0031] Figure 9 is a structural schematic view of the four-pole circuit breaker provided by Embodiment One of the present application;

[0032] Figure 10 is a structural schematic view of the three-pole circuit breaker provided by Embodiment Two of the present application.

[0033] In the figure:

[0034] 10, terminal; 11, terminal seat; 12, pressure piece; 20, arc extinguishing device; 30, handle;

[0035] 100, two-pole circuit breaker; 111, first coil; 1111, extension; 120, second breaking unit; 121, second stationary contact; 122, second movable contact; 123, second coil; 130, partition; 131a, open slot; 131b, wire hole; 132, first limiting slot; 140, first short-circuit conductor; 150, sealing plate; 160, first base; 170, first upper cover; 180, first connecting strip;

[0036] 200, second connecting strip;

[0037] 300, single-pole circuit breaker; 310, second base; 320, second upper cover;

[0038] 400, third connecting strip. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the sake of description, only the parts related to the application are shown in the drawings, not all the structures.

[0040] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0043] Embodiment one

[0044] Referring to Figures 1 to 3 As shown in the figure, the present embodiment provides a direct current circuit breaker, which comprises a two-pole circuit breaker 100, and the two-pole circuit breaker 100 comprises a first breaking unit and a second breaking unit 120.

[0045] Specifically, the first breaking unit comprises a first static contact, a first moving contact and a first coil 111, a first end of the first coil 111 being electrically connected with the first static contact; the second breaking unit 120 comprises a second static contact 121, a second moving contact 122 and a second coil 123, a first end of the second coil 123 being electrically connected with the second static contact 121, a second end of the second coil 123 being electrically connected with a second end of the first coil 111.

[0046] In the embodiment, the first breaking unit and the second breaking unit 120 are connected in series by the second end of the first coil 111 being electrically connected with the second end of the second coil 123, and then the two-pole circuit breaker 100 is formed. Compared with the traditional series connection, the busbar and the related connection accessories, such as the terminal block and the terminal board, are saved, and the cost is reduced. When the DC circuit breaker is closed, the first moving contact and the first static contact are in contact and conductive, and the second moving contact 122 and the second static contact 121 are in contact and conductive. The current flows through the first moving contact, the first static contact, the first coil 111, the second coil 123, the second static contact 121 and the second moving contact 122 in turn, the length of the current-carrying loop is shortened, the temperature rise and the power consumption of the DC circuit breaker are reduced, and the safety is ensured. In addition, the customer does not need to separately complete the series connection of the first breaking unit and the second breaking unit 120, and the time is saved.

[0047] In the embodiment, the first moving contact and the second moving contact are respectively electrically connected with one terminal 10. For example, the terminal 10 connected with the first moving contact is electrically connected with the input power supply, and the terminal 10 connected with the second moving contact 122 is electrically connected with the load. When the DC circuit breaker is closed, the current flows through the first moving contact, the first static contact, the first coil 111, the second coil 123, the second static contact 121 and the second moving contact 122 in turn, and then the length of the current-carrying loop is shortened, and the terminal 10 connected with the first static contact and the terminal 10 connected with the second static contact 121 are saved, i.e. two terminals 10 are saved. Of course, the first static contact and the second static contact can also be respectively electrically connected with one terminal 10 to improve the applicability. In the embodiment, when the terminal 10 connected with the first moving contact is electrically connected with the input power supply, and the terminal 10 connected with the second moving contact 122 is electrically connected with the load, the current does not flow through the terminal 10 connected with the first static contact and the terminal 10 connected with the second static contact 121.

[0048] Specifically, the terminal 10 comprises a terminal seat 11, a terminal plate (not shown) and a pressing member 12. The terminal seat 11 is provided with a terminal hole, and the terminal plate is located in the terminal hole and connected with the pressing member 12. In the embodiment, the external wire is inserted into the terminal hole, and the pressing member 12 extrudes the external wire through the terminal plate to fix the external wire. The pressing member 12 comprises but is not limited to a screw member. Specifically, the threaded end of the pressing member 12 is inserted into the terminal hole through the terminal seat 11 and connected with the pressing member, and the threaded end of the pressing member 12 is screwed with the terminal seat 11. The terminal plate is pressed against the external wire by screwing the pressing member 12.

[0049] Specifically, the partition plate has a first end and a second end oppositely arranged along the first direction. Figure 2 The a direction in the above formula is the first direction.

[0050] In a feasible implementation, the terminal 10 connected with the first movable contact and the terminal 10 connected with the second movable contact are arranged at the second end of the two-pole circuit breaker 100 along the first direction, which facilitates wiring, makes the wiring neat, and effectively avoids the situation of incorrect wiring. Specifically, the first movable contact and the second movable contact 122 are located at the second end of the two-pole circuit breaker 100 along the first direction, so that the terminal 10 connected with the first movable contact and the terminal 10 connected with the second movable contact are arranged close to the first movable contact and the second movable contact 122, effectively shortening the length of the current-carrying loop.

[0051] In a feasible implementation, the first breaking unit and the second breaking unit 120 can have the same structure.

[0052] In the embodiment, as shown in Figures 1 to 8 , the two-pole circuit breaker 100 further comprises a partition plate 130, and the first breaking unit and the second breaking unit 120 are arranged on two sides of the partition plate 130, respectively. The first breaking unit and the second breaking unit 120 are separated by the partition plate 130 to prevent the situation of damage to the two-pole circuit breaker 100 caused by arc interphase short circuit.

[0053] In a feasible implementation, as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the two-pole circuit breaker 100 further comprises a first short-circuit conductor 140, the second end of the first coil 111 is electrically connected with the second end of the second coil 123 through the first short-circuit conductor 140, facilitating connection. Specifically, the partition plate 130 is provided with an open slot 131a, the first end of the first short-circuit conductor 140 is electrically connected with the second end of the first coil 111, and the second end of the first short-circuit conductor 140 penetrates the open slot 131a and is electrically connected with the second end of the second coil 123. In this embodiment, due to the design of the open slot 131a, the first coil 111 and the second coil 123 can be connected together to form a short-circuit tripping module through the first short-circuit conductor 140, and then the first short-circuit conductor 140 can be penetrated into the open slot 131a from the opening of the open slot 131a to complete the assembly of the first coil 111 and the second coil 123 relative to the partition plate 130, which is simple and convenient. Exemplarily, the first coil 111 and the second coil 123 can be connected with the first short-circuit conductor 140 by welding.

[0054] Specifically, the opening of the open slot 131a is arranged towards the front side of the two-pole circuit breaker 100, so as to facilitate the installation of the first short-circuit conductor 140 into the open slot 131a and prevent interference during installation.

[0055] Specifically, the partition plate 130 is provided with a detachable sealing plate 150. In this embodiment, after the first short-circuit conductor 140 of the short-circuit tripping module is installed into the open slot 131a, the sealing plate 150 seals the open slot 131a, thereby forming protection and effectively improving safety performance.

[0056] Specifically, the open slot 131a is arranged at the first end of the partition plate 130 along the first direction, i.e., the open slot 131a is arranged away from the terminal 10 connected with the first movable contact and the terminal 10 connected with the second movable contact, facilitating the installation of the first short-circuit conductor 140 into the open slot 131a and effectively ensuring the compactness of the two-pole circuit breaker 100. Further specifically, the opening of the open slot is located at the first end of the partition plate 130 along the first direction, i.e., the sealing plate 150 is located at the first end of the partition plate 130 along the first direction.

[0057] In another possible implementation manner, as shown in FIG. 6, Figures 6 to 8 Specifically, the second end of one of the first coil 111 and the second coil 123 extends to the second end of the other one and contacts and conducts. Exemplarily, the partition plate 130 is provided with a wire hole 131b, the second end of the first coil 111 is provided with an extension 1111, the extension 1111 penetrates the wire hole 131b and contacts and conducts with the second end of the second coil 123. In this embodiment, the extension 1111 can be penetrated through the wire hole 131b first, and then the extension 1111 contacts and conducts with the second end of the second coil 123. Exemplarily, the extension 1111 and the second end of the second coil 123 can be connected by welding.

[0058] Specifically, the second end of the first coil 111 is bent to form an extension 1111 towards the partition plate 130, which facilitates the extension 1111 to pass through the wire hole 131b and contact and conduct with the second end of the second coil 123.

[0059] Specifically, the wire hole 131b is arranged at the first end of the partition plate 130 along the first direction, i.e., the wire hole 131b is arranged away from the terminal 10 connected with the first movable contact and the terminal 10 connected with the second movable contact, which effectively ensures the compactness of the two-pole circuit breaker 100 and facilitates the extension 1111 to pass through the wire hole 131b and contact and conduct with the second end of the second coil 123.

[0060] In the embodiment, continuing to refer to Figures 1 to 8 As shown in the figure, the two-pole circuit breaker 100 further comprises a first base 160 and a first cover 170. The first base 160 is arranged at the first side of the partition plate 130, and a first installation cavity is formed between the first base 160 and the partition plate 130, in which the first breaking unit is arranged. The first cover 170 is arranged at the second side of the partition plate 130, and a second installation cavity is formed between the first cover 170 and the partition plate 130, in which the second breaking unit 120 is arranged. In the embodiment, the first base 160 and the first cover 170 are designed to isolate the first breaking unit and the second breaking unit 120 from the outside, which effectively improves the safety performance.

[0061] Specifically, taking the partition plate 130 provided with the open slot 131a as an example, the sealing plate 150 can extend into the first base 160 and the first cover 170 to achieve better sealing performance. In the embodiment, the slot of the open slot 131a is provided with a first clamping groove, the first base 160 is provided with a second clamping groove, and the first cover 170 is provided with a third clamping groove. The first clamping groove, the second clamping groove and the third clamping groove are spliced into an annular clamping groove, and the edge of the sealing plate 150 is clamped in the annular clamping groove to achieve better sealing performance.

[0062] Specifically, as shown in Figure 5 and Figure 7 The second side of the partition plate 130 is provided with a first limiting slot 132, and the second coil 123 is arranged in the first limiting slot 132 to position and fix the second coil 123 between the partition plate 130 and the first cover 170. Exemplarily, the second coil 123 can be clamped with the first limiting slot 132.

[0063] Specifically, the first base 160 is provided with a second limiting slot (not shown), and the first coil 111 is arranged in the second limiting slot to position and fix the first coil 111 between the first base 160 and the partition plate 130. Exemplarily, the first coil 111 can be clamped with the second limiting slot.

[0064] Exemplarily, as shown in Figure 2 For example, the second end of the first coil 111 is electrically connected with the second end of the second coil 123 through the first short-circuit conductor 140. In assembly, the first coil 111 and the second coil 123 are welded with the first short-circuit conductor 140, the first coil 111 is clamped in the second limiting groove of the first base 160, then the first short-circuit conductor 140 is inserted into the opening groove 131a from the opening of the opening groove 131a, the partition plate 130 is installed relative to the first base 160, the second coil 123 is clamped in the first limiting groove 132 of the partition plate 130, and finally the sealing plate 150 and the first upper cover 170 are sequentially installed on the partition plate 130, which is convenient for assembly.

[0065] Exemplarily, as shown in Figure 8 For example, the second end of the first coil 111 is electrically connected with the second end of the second coil 123 through the first short-circuit conductor 140. In assembly, the first coil 111 and the second coil 123 are welded with the first short-circuit conductor 140, the first coil 111 is clamped in the second limiting groove of the first base 160, then the first short-circuit conductor 140 is inserted into the opening groove 131a from the opening of the opening groove 131a, the partition plate 130 is installed relative to the first base 160, the second coil 123 is clamped in the first limiting groove 132 of the partition plate 130, and finally the sealing plate 150 and the first upper cover 170 are sequentially installed on the partition plate 130, which is convenient for assembly.

[0066] In a feasible implementation, the first upper cover 170 can be spliced with the first base 160 to form a third installation cavity, and the first breaking unit or the second breaking unit 120 can be arranged in the third installation cavity, thereby increasing the versatility. In the embodiment, the first upper cover 170 is directly covered on the first base 160 after the partition plate 130 is removed.

[0067] In the embodiment, continuing to refer to Figure 3 As shown in the figure, the first breaking unit and the second breaking unit 120 each further include a handle 30, the handle 30 of the first breaking unit can realize the contact and separation between the first moving contact and the first stationary contact, and the handle 30 of the second breaking unit 120 can realize the contact and separation between the second moving contact 122 and the second stationary contact 121.

[0068] Specifically, the handle 30 of the first breaking unit and the handle 30 of the second breaking unit 120 are spliced together to realize the synchronous action of the handle 30. Further specifically, the handle 30 of the first breaking unit and the handle 30 of the second breaking unit 120 are spliced through the first connecting strip 180, which is convenient for assembly and reliable in connection. Exemplarily, the connection mode of the handle 30 and the first connecting strip 180 includes but is not limited to clamping and bonding.

[0069] Further, the first and second breaking units 120 each further comprise an arc extinguishing assembly (not shown), which is known in the art and not the focus of the present application and thus will not be described in detail.

[0070] In the present embodiment, the DC circuit breaker comprises at least one two-pole circuit breaker 100.

[0071] Specifically, as shown in Figure 9 when two two-pole circuit breakers 100 are provided, the two two-pole circuit breakers 100 are arranged side by side to form a four-pole circuit breaker, improving applicability and saving four connection terminals 10.

[0072] Specifically, as shown in Figure 9 the handles 30 of the two two-pole circuit breakers 100 are spliced to achieve synchronous operation of the handles 30. In one possible implementation, the first connecting strips 180 of the two adjacent two-pole circuit breakers 100 can be connected into one body, or the DC circuit breaker further comprises a second connecting strip 200, which comprises multiple specifications and lengths to be suitable for connection with all the handles 30, thereby achieving consistency in operation of all the handles 30. Exemplarily, the connection manner of the handle 30 and the second connecting strip 200 includes but is not limited to clamping and bonding.

[0073] Embodiment Two

[0074] Referring to Figure 10 the present embodiment provides a DC circuit breaker comprising a single-pole circuit breaker 300 and at least one two-pole circuit breaker 100 provided in Embodiment One, the single-pole circuit breaker 300 being arranged side by side with the two-pole circuit breaker 100.

[0075] Specifically, the single-pole circuit breaker 300 comprises a third static contact (not shown), a third dynamic contact (not shown) and a third coil (not shown), a first end of the third coil being electrically connected with the third static contact.

[0076] In the present embodiment, still referring to Figure 10 the DC circuit breaker comprises one two-pole circuit breaker 100, i.e., the DC circuit breaker is a three-pole circuit breaker. Specifically, the single-pole circuit breaker 300 further comprises a second base 310 and a second upper cover 320, the second upper cover 320 being covered on the second base 310 to form a fourth mounting cavity, the third static contact, the third dynamic contact and the third coil being all mounted in the fourth mounting cavity. The structure of the second base 310 can be the same as that of the first base 160, and the structure of the second upper cover 320 can be the same as that of the first upper cover 170.

[0077] Further, the handle 30 of the single-pole circuit breaker 300 is spliced with the handle 30 of the two-pole circuit breaker 100 to realize the consistency of the handle 30 action. Specifically, the handle 30 of the single-pole circuit breaker 300 and the handle 30 of the two-pole circuit breaker 100 are spliced by the third connecting strip 400, facilitating assembly and reliable connection. Among them, the third connecting strip 400 includes multiple specifications and lengths to be suitable for connection with all handles 30, thereby realizing the consistency of the action of all handles 30. Exemplarily, the connection mode of the handle 30 and the third connecting strip 400 includes but is not limited to clamping and bonding.

[0078] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A direct current circuit breaker, characterized by, The two-pole circuit breaker (100) comprises: A first breaking unit comprising a first static contact, a first dynamic contact and a first coil (111), a first end of the first coil (111) being electrically connected with the first static contact; A second breaking unit (120) comprising a second static contact (121), a second dynamic contact (122) and a second coil (123), a first end of the second coil (123) being electrically connected with the second static contact (121), a second end of the second coil (123) being electrically connected with a second end of the first coil (111), so that the first breaking unit and the second breaking unit (120) are connected in series; When the DC circuit breaker is closed, the current flows through the first dynamic contact, the first static contact, the first coil (111), the second coil (123), the second static contact (121) and the second dynamic contact (122) in turn.

2. The DC circuit breaker according to claim 1, characterized in that The two-pole circuit breaker (100) further comprises a partition plate (130), and the first breaking unit and the second breaking unit (120) are arranged on two sides of the partition plate (130) respectively.

3. The DC circuit breaker according to claim 2, characterized in that An open slot (131a) is arranged on the partition plate (130); The two-pole circuit breaker (100) further comprises a first short-circuit conductor (140), a first end of the first short-circuit conductor (140) being electrically connected with the second end of the first coil (111), and a second end of the first short-circuit conductor (140) penetrating the open slot (131a) and being electrically connected with the second end of the second coil (123).

4. The DC circuit breaker according to claim 3, characterized in that The first coil (111), the first short-circuit conductor (140) and the second coil (123) constitute a short-circuit tripping module; A detachable sealing plate (150) is arranged on the partition plate (130), and the sealing plate (150) is used for closing the open slot (131a) after the first short-circuit conductor (140) of the short-circuit tripping module is arranged in the open slot (131a).

5. The DC circuit breaker according to claim 3, characterized in that, The open slot (131a) is arranged at a first end of the partition plate (130) along a first direction (a). 6.The DC circuit breaker according to claim 2, characterized in that An overline hole (131b) is arranged on the partition plate (130), a second end of the first coil (111) is provided with an extension (1111), the extension (1111) penetrates the overline hole (131b) and is in contact with the second end of the second coil (123).

7. The DC circuit breaker according to claim 6, characterized in that The second end of the first coil (111) is bent towards the partition plate (130) to form the extension (1111). 8.The DC circuit breaker according to claim 6, characterized in that The overline hole (131b) is arranged at a first end of the partition plate (130) along a first direction (a).

9. The DC circuit breaker according to any of claims 1 to 8, characterized in that The first dynamic contact and the second dynamic contact are respectively electrically connected with one terminal (10), and the terminal (10) connected with the first dynamic contact and the terminal (10) connected with the second dynamic contact are both arranged at a second end of the two-pole circuit breaker (100) along the first direction.

10. The DC circuit breaker according to any of claims 1-8, characterized in that, The two-pole circuit breaker (100) is provided with two, the two-pole circuit breaker (100) is arranged side by side, and the handles (30) of the two-pole circuit breaker (100) are spliced.

11. The DC circuit breaker according to any of claims 1 to 8, characterized in that Also included is a single-pole circuit breaker (300) comprising a third static contact, a third dynamic contact and a third coil, the first end of the third coil being electrically connected with the third static contact; the single-pole circuit breaker (300) is arranged side by side with the two-pole circuit breaker (100), and the handle (30) of the single-pole circuit breaker (300) is spliced with the handle (30) of the two-pole circuit breaker (100).

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