Static contact and isolating switch

Abstract

The utility model discloses a static contact and an isolation switch, and the static contact comprises a first contact part, a first connection part, and a first welding foot part. The size of the first contact part in the height direction is a first thickness, the size of the first connection part in the height direction is a second total thickness, and the second total thickness is greater than the first thickness; the number of the first welding foot parts is at least two, the first welding foot parts are connected to the first side face of the first connection part, and the first contact part is connected to the other side face, except the first side face, of the first connection part. The current-carrying capacitor has the advantage of being good in current-carrying capacity.

Description

Technical Field

[0001] This application relates to a disconnecting switch used in a power supply system. Background Technology

[0002] In recent years, with the rapid development of the photovoltaic and energy storage fields, the demand for inverters has been increasing year by year, and the performance requirements for inverters have also been continuously improving. As an important component in inverters, disconnecting switches are responsible for the function of connecting and disconnecting control circuits.

[0003] Conventional disconnect switches are wired using screws. However, with ongoing research into disconnect switches, a wiring method has emerged that involves creating solder pads on a set of stationary contacts and soldering these pads to the PCB board.

[0004] As disclosed in CN220774145U, its stationary contact can be divided into a first contact part, a first connecting part, and a first solder foot part according to its function. The first contact part is used to contact the moving contact, the first connecting part connects the first contact part and the first solder foot part, and the first solder foot part is used to solder to the PCB board.

[0005] The existing stationary contact with soldered feet has a flat plate structure with uniform thickness throughout, thus limiting its current-carrying capacity. Of course, simply increasing the dimensions of the stationary contact in all directions to increase current-carrying capacity is not advisable, as it would also require a comprehensive enlargement of the switch unit housing, significantly occupying internal space within the inverter.

[0006] Therefore, how to design a more reasonable static contact mechanism that increases its current-carrying capacity compared to existing technologies is clearly a question worth considering. Summary of the Invention

[0007] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a stationary contact, a disconnecting switch.

[0008] This application provides: a stationary contact, comprising a first contact portion, a first connecting portion, and a first solder foot portion; the first contact portion has a first thickness in the height direction, the first connecting portion has a second total thickness in the height direction, and the second total thickness is greater than the first thickness; the number of first solder feet portions is at least two, the first solder feet portions are connected to a first side of the first connecting portion, and the first contact portion is connected to another side of the first connecting portion other than the first side.

[0009] In some embodiments of this application, the first connecting portion includes sub-connecting portions corresponding to the number of first solder feet, each first solder foot being connected to a sub-connecting portion, and the second total thickness being the sum of the thicknesses of all sub-connecting portions; the first contact portion is connected to one of the sub-connecting portions, which is sub-connecting portion I; all other sub-connecting portions are connected to sub-connecting portion I, or the other sub-connecting portions are connected sequentially and then connected to sub-connecting portion I through one of the sub-connecting portions.

[0010] In some embodiments of this application, the first connecting part is a bun connecting part I and a sub-connecting part II; all first welding feet are connected to the first side of the sub-connecting part I or to the first side of all the sub-connecting parts II; the first contact part is connected to the other side of the sub-connecting part I or the sub-connecting part II other than the first side; the second total thickness is the sum of the thicknesses of the sub-connecting part I and the sub-connecting part II; the sub-connecting part I and the sub-connecting part II are integrally formed, or fixed by welding, riveting, or screw fastening.

[0011] In some embodiments of this application, each first weld foot is spaced apart in a first direction and is at the same height in the height direction.

[0012] In some embodiments of this application, the thickness of the first weld leg is d1, and the distance between two adjacent first weld legs is d2, where 8d1≥d2≥3d1.

[0013] In some embodiments of this application, there are two sub-connecting portions and two first welding feet. The other sub-connecting portion besides sub-connecting portion I is called sub-connecting portion II. The first welding foot corresponding to sub-connecting portion I is called first welding foot I, and the first welding foot corresponding to sub-connecting portion II is called first welding foot II. Sub-connecting portion II is located above or below sub-connecting portion I. Sub-connecting portion II and sub-connecting portion I are connected by a first bending section, and sub-connecting portion II and first welding foot II are connected by a second bending section. First welding foot I and first welding foot II are at the same height in the height direction and are spaced apart in the first direction. In the first direction, the distance between first welding foot II and the first bending section is greater than the distance between first welding foot I and the first bending section.

[0014] In some embodiments of this application, in the first direction, the second bending segment is located between the first weld leg portion I and the first weld leg portion II; the thickness of the first weld leg portion I and the first weld leg portion II is d1, and there is a gap d3 between the second bending segment and the first weld leg portion I in the first direction, where d3 is not less than d1.

[0015] A disconnecting switch includes an operating unit layer and a switching unit layer, wherein the operating unit layer is used to control the connection and disconnection of the switching unit layer; wherein the switching unit layer includes at least one first switching unit layer, the first switching unit layer includes a first switching unit layer housing, a first stationary contact I and a first stationary contact II, wherein the first stationary contact I is one of the aforementioned stationary contacts.

[0016] In some embodiments of this application, the switching unit layer further includes a second switching unit layer, the number of which is 2-5 times the number of the first switching unit layers, and the current carrying capacity of the first switching unit layer is greater than that of the second switching unit layer; the second switching unit layer includes a second switching unit layer housing, a second stationary contact I, and a second stationary contact II; the dimension of the first switching unit layer housing in the height direction is greater than that of the second switching unit layer housing in the height direction; the second stationary contact I includes a second contact portion, a second connecting portion, and a second solder foot portion; the number of second solder feet in a single second switching unit layer is less than the number of first solder feet in a single first switching unit layer; the dimension of the second connecting portion in the height direction in a single second switching unit layer is less than the second total thickness of the first connecting portion in a single first switching unit layer; the current carrying capacity of the first stationary contact I is greater than that of the second stationary contact I.

[0017] In some embodiments of this application, the first stationary contact II includes a first contact segment, a first wiring segment, and a first fastener. The first contact segment and the first wiring segment are electrically connected, and the first fastener is disposed on the first wiring segment. The second stationary contact II includes a second contact segment, a second wiring segment, and a second fastener. The second contact segment and the second wiring segment are electrically connected, and the second fastener is disposed on the second wiring segment. The specifications of the first fastener are larger than those of the second fastener. The thickness of the first contact segment is greater than that of the second contact segment. The thickness of the first wiring segment is greater than that of the second wiring segment. The current carrying capacity of the first stationary contact II is greater than that of the second stationary contact II.

[0018] The advantages of this application compared to the prior art are:

[0019] By improving the number of solder feet and the total thickness of the first connection (in the prior art, the total thickness of the first connection is the same as that of the first contact), this type of stationary contact has a better current carrying capacity than the prior art. This structure does not enlarge all the dimensions of the stationary contact, but takes into account both the improvement of current carrying capacity and the more compact structure of the stationary contact. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of one embodiment of the stationary contact of this application is shown;

[0022] Figure 2 A schematic diagram of another embodiment of the stationary contact of this application is shown;

[0023] Figure 3 A side view of another embodiment of the stationary contact of this application is shown;

[0024] Figure 4 A schematic diagram of a disconnecting switch using a stationary contact according to an embodiment of this application is shown;

[0025] Figure 5 A schematic diagram of another embodiment of the disconnecting switch using the stationary contact of the present application is shown;

[0026] Figure 6 It shows Figure 5 A schematic diagram of the moving and stationary contacts inside the first and second switch unit layers. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0032] like Figure 1-3 As shown, an embodiment of this application is a stationary contact, which includes a first contact portion 101, a first connecting portion 102, and a first solder foot portion 103. In the height direction H, the thickness of the first contact portion 101 is a first thickness S1, and the thickness of the first connecting portion 102 is a second total thickness S2, where the second total thickness S2 is greater than the first thickness S1. There are at least two first solder feet 103, and both first solder feet 103 are connected to a first side surface of the first connecting portion 102. The first contact portion 101 is connected to another side surface of the first connecting portion 102 other than the first side surface.

[0033] This structural design increases the number of solder feet compared to existing technologies, while also increasing the thickness of the first connecting portion 102, thereby improving the current-carrying capacity of the stationary contact.

[0034] Here, the first contact portion 101 and the first weld foot portion 103 may be provided on two opposing sides of the first connecting portion 102, for example, on both sides of the first connecting portion 102 in the second direction (width direction D in this embodiment); the first contact portion 101 and the first weld foot portion 103 may also be provided on two adjacent sides.

[0035] Taking the configuration with two first weld feet 103 as an example (of course, it is also possible to have more first weld feet 103), including the following two methods:

[0036] In one embodiment, the first connecting portion 102 includes sub-connecting portion I 102a and sub-connecting portion II 102b, and the second total thickness S2 is the sum of the thicknesses of sub-connecting portion I 102a (thickness S2a) and sub-connecting portion II 102b (thickness S2b) (S2 = S2a + S2b). Here, the first welding feet 103 are all connected to sub-connecting portion I 102a, and the first contact portion 101 is also connected to sub-connecting portion I 102a. In this embodiment, sub-connecting portion I 102a and sub-connecting portion II 102b are fixed by welding.

[0037] This approach not only gives the stationary contact good current-carrying capacity, but also features simple structural forming and convenient processing and assembly.

[0038] In this manner, all the first weld feet 103 are spaced apart in the first direction L (the length direction in this embodiment, but not limited to the length direction) and are at the same height in the height direction H.

[0039] This height and the L-shaped arrangement in the first direction allow for better assembly with the PCB board.

[0040] Here, the thickness d1 of the first weld leg 103 and the spacing between two adjacent first weld legs 103 are d2, where d2 = 4d1. This spacing ensures a suitable distance between multiple first weld legs 103. Of course, there are many parameters that can be chosen for d2, as long as 8d1 ≥ d2 ≥ 3d1 is acceptable.

[0041] Alternatively, all first weld feet 103 can be connected to sub-connector II 102b. Alternatively, the sub-connectors to which the first contact portion 101 and the first weld feet 103 are connected can be different (for example, the first weld feet 103 connect to sub-connector I 102a, and the first weld feet 103 connect to sub-connector II 102b). Alternatively, sub-connector I 102a and sub-connector II 102b can be integrally formed, or they can be fixed by riveting, or they can be fastened with screws.

[0042] Method 2: The first connecting portion 102 includes sub-connecting portion I 102a and sub-connecting portion II 102b, and the first welding foot portion 103 consists of first welding foot portion I 103a and first welding foot portion II 103b. The first contact portion 101 and the first welding foot portion I 103a are both connected to the sub-connecting portion I 102a, and the first welding foot portion II 103b is connected to the sub-connecting portion II 102b. The sub-connecting portion I 102a and the sub-connecting portion II 102b are connected, and the first contact portion 101 is connected to the sub-connecting portion I 102a. The total thickness of the sub-connecting portion I 102a (thickness S2a) and the sub-connecting portion II 102b (thickness S2b) is the second total thickness S2 (S2 = S2a + S2b).

[0043] With this structure, the stationary contact will also have better current carrying capacity, and its molding is more convenient. Each first welding foot 103 has a corresponding sub-connection part.

[0044] Here, the number of sub-connecting parts and the number of first welding feet 103 are in one-to-one correspondence. When there are more than two, the sub-connecting parts other than sub-connecting part I 102a can be connected together on sub-connecting part I 102a, or they can be connected in sequence and then connected to sub-connecting part I 102a through one of the sub-connecting parts.

[0045] In this structure, each of its first weld feet 103 is spaced apart in the first direction L (in this embodiment, the length direction, but it is not limited to the length direction) and is at the same height in the height direction H.

[0046] There are many structures that can achieve this arrangement. In the height direction H, the sub-connector II 102b is located below the sub-connector I 102a, and the two are connected by a first bending section 104. Here, the first bending section 104 is a U-shaped bend, which ensures that the sub-connector II 102b is below the sub-connector I 102a. The first welding foot I 103a, the first contact part 101, and the sub-connector I 102a are at the same height. The sub-connector II 102b and the first welding foot II 103b are connected by a second bending section 105 (here, an S-shaped bend), so that the first welding foot II 103b and the first welding foot I 103a are at the same height. Here, in the dimensions in the first direction L, the distance L2 between the first welding foot II 103b and the first bending section 104 is greater than the distance L1 between the first welding foot I 103a and the first bending section 104.

[0047] This structure, through the design of the first bending section 104 and the second bending section 105, allows the first solder foot I 103a and the first solder foot II 103b to be at the same height, enabling them to be better assembled with the PCB board.

[0048] In this method, the thickness of both the first weld leg I 103a and the first weld leg II 103b is d1, and the distance between them is d2, where d2 = 4d1. This distance ensures a suitable gap between the first weld leg I 103a and the first weld leg II 103b. Of course, there are many parameters that can be chosen for d2, as long as 8d1 ≥ d2 ≥ 3d1 is acceptable.

[0049] In this manner, either the first weld leg portion II 103b can be positioned between the first weld leg portion I 103a and the second bending segment 105 in the first direction L, or the second bending segment 105 can be positioned between the first weld leg portion II 103b and the first weld leg portion I 103a in the first direction L.

[0050] When the first bending segment 104 is located between the first weld leg portion II 103b and the first weld leg portion I 103a in the first direction L, the thickness of the first weld leg portion I 103a and the first weld leg portion II 103b is d1. There is a gap d3 between the second bending segment 105 and the first weld leg portion I 103a in the first direction L. Here, it is only necessary to ensure that d3 is not less than d1.

[0051] This method ensures sufficient electrical clearance between the first weld leg part Ⅰ103a and the first weld leg part Ⅱ103b, thereby improving the performance of the stationary contact.

[0052] The aforementioned stationary contact can be used in disconnecting switches, specifically in disconnecting switches where all switch unit layers 20 have the same current-carrying capacity (e.g., ...). Figure 4 As shown in the figure, it can also be applied to disconnect switches with different current carrying capacities in the switch unit layer 20.

[0053] Take, for example, disconnect switches with different current-carrying capacities applied in the switch unit layer 20.

[0054] like Figure 5-6 As shown, this disconnecting switch includes an operating unit layer 10 and a switching unit layer 20.

[0055] The operating unit layer 10 contains an operating mechanism. The input end of the operating mechanism is connected to a knob, and the output end is connected to a moving contact within the switch unit layer 20. By operating the knob, the user can rotate the moving contact within the switch unit layer 20, thereby enabling the disconnection of the isolating switch. The operating mechanism is common knowledge in this field and will not be described in detail here.

[0056] The switch unit layer 20 is stacked sequentially below the operating unit layer 10 along the height direction H. The moving contacts of each switch unit layer 20 are interlocked with each other, and the moving contact plate of the first layer of switch unit layers 20 is connected to the output terminal of the operating mechanism. This allows multiple switch unit layers 20 to move simultaneously under the control of the operating mechanism.

[0057] The switching unit layer 20 is divided into a first switching unit layer 20a and a second switching unit layer 20b. The current carrying capacity of the first switching unit layer 20a is greater than that of the second switching unit layer 20b.

[0058] The first switch unit layer 20a includes a first switch unit layer housing 20a1, a first stationary contact I, a first stationary contact II, and a first moving contact. The first stationary contact I can be any one of the two methods mentioned above. The specific details will not be elaborated here.

[0059] The first stationary contact II includes a first contact section 106, a first wiring section 107, and a first fastener 108. The first contact section 106 and the first wiring section 107 are electrically connected. Here, "electrical connection" means that the two are integrally formed; of course, they can also be connected by a flexible wire. The first fastener 108 is disposed on the first wiring section 107, and here the first fastener 108 is a wiring screw.

[0060] After the first moving contact rotates in one direction, it simultaneously contacts the first contact segment 106 and the first contact portion 101 to achieve connection; after the first moving contact rotates in the opposite direction, it simultaneously separates from the first contact segment 106 and the first contact portion 101 to achieve disconnection.

[0061] The second switch unit layer 20b includes a second switch unit layer housing 20b1, a second stationary contact I, a second stationary contact II, and a second moving contact.

[0062] The second stationary contact I includes a second contact portion 201, a second connecting portion 202, and a second solder foot portion 203. The second contact portion 201 and the second solder foot portion 203 are connected to both sides of the second connecting portion 202.

[0063] Here, the number of second solder feet 203 is one. The number of second solder feet 203 in one layer of second switching unit layer 20b is less than the number of first solder feet 103 in one layer of first switching unit layer 20a. Similarly, the dimension of the second connecting portion 202 in the height direction H of one layer of second switching unit layer 20b is less than the second total thickness S2 of the first connecting portion 102 in one layer of first switching unit layer 20a. This allows the current carrying capacity of the first stationary contact I to be greater than that of the second stationary contact I.

[0064] The second stationary contact II includes a second contact section 204, a second wiring section 205, and a second fastener 206. The second contact section 204 and the second wiring section 205 are electrically connected, meaning they are connected via a second bend; alternatively, they can be connected using a flexible wire. The second fastener 206 is mounted on the second wiring section 205 and is a wiring screw. Here, the first fastener 108 is larger than the second fastener 206, the first contact section 106 is thicker than the second contact section 204, and the first wiring section 107 is thicker than the second wiring section 205. This design allows the first stationary contact II to have a higher current-carrying capacity than the second stationary contact II.

[0065] After the second moving contact rotates in one direction, it simultaneously contacts the second contact section 204 and the second contact portion 201 to achieve connection; after the second moving contact rotates in the opposite direction, it simultaneously separates from the second contact section 204 and the second contact portion 201 to achieve disconnection.

[0066] For moving contacts, the current carrying capacity of the first moving contact is greater than that of the second moving contact. This can be reflected in the fact that the first moving contact uses a material with better conductivity than the second moving contact, or in the fact that the first moving contact uses a larger conductor cross-sectional area (or larger size) than the second moving contact.

[0067] Regarding the housing, the dimension of the first switch unit layer housing 20a1 in the height direction H is larger than the dimension of the second switch unit layer housing 20b1 in the height direction H.

[0068] Here, the total number of first switch unit layers 20a is 3, and the total number of second switch unit layers 20b is 9. The 3 first switch unit layers 20a are stacked sequentially, and the 9 second switch unit layers 20b are stacked sequentially below the first switch unit layers 20a. Alternatively, the first switch unit layers 20a and second switch unit layers 20b can be arranged alternately, for example, with 3 second switch unit layers 20b sandwiched between two first switch unit layers 20a. Since the current-carrying capacity (current-carrying capacity refers to the ability to withstand flowing current) of the first switch unit layer 20a is greater than that of the second switch unit layer 20b, the first switch unit layer 20a can connect to a greater number of photovoltaic modules (or photovoltaic modules with a larger output current) than the second switch unit layer 20b, thus meeting user needs. Here, the number of first switch unit layers 20a and second switch unit layers 20b only needs to be 2-5 times the number of first switch unit layers 20a.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A stationary contact, characterized in that: It includes a first contact portion, a first connecting portion, and a first welding foot portion; the first contact portion has a first thickness in the height direction, the first connecting portion has a second total thickness in the height direction, and the second total thickness is greater than the first thickness; the number of first welding feet portions is at least two, the first welding feet portions are connected to a first side of the first connecting portion, and the first contact portion is connected to another side of the first connecting portion other than the first side.

2. A stationary contact according to claim 1, characterized in that: The first connecting part includes sub-connecting parts corresponding to the number of first weld feet. Each first weld foot is connected to a sub-connecting part, and the second total thickness is the sum of the thicknesses of all sub-connecting parts. The first contact part is connected to one of the sub-connecting parts, which is sub-connecting part I. All other sub-connecting parts are connected to sub-connecting part I, or the other sub-connecting parts are connected in sequence and then connected to sub-connecting part I through one of the sub-connecting parts.

3. A stationary contact according to claim 1, characterized in that: The first connecting part is the connecting part I and the sub-connecting part II; all the first welding feet are connected to the first side of the sub-connecting part I or to the first side of the sub-connecting part II; the first contact part is connected to the other side of the sub-connecting part I or the sub-connecting part II other than the first side; the second total thickness is the sum of the thicknesses of the sub-connecting part I and the sub-connecting part II; the sub-connecting part I and the sub-connecting part II are integrally formed, or fixed by welding, riveting, or screw fastening.

4. A stationary contact according to claim 1, characterized in that: Each of the first weld feet is spaced apart in the first direction and is at the same height in the height direction.

5. A stationary contact according to claim 4, characterized in that: The thickness of the first weld leg is d1, and the distance between two adjacent first weld legs is d2, where 8d1≥d2≥3d1.

6. A stationary contact according to claim 2, characterized in that: The number of sub-connecting parts and first weld feet are both two. The other sub-connecting part besides sub-connecting part I is sub-connecting part II. The first weld foot corresponding to sub-connecting part I is first weld foot I, and the first weld foot corresponding to sub-connecting part II is first weld foot II. Sub-connecting part II is located above or below sub-connecting part I. Sub-connecting part II and sub-connecting part I are connected by a first bending section, and sub-connecting part II and first weld foot II are connected by a second bending section. First weld foot I and first weld foot II are at the same height in the height direction and are spaced apart in the first direction. In the first direction, the distance between first weld foot II and the first bending section is greater than the distance between first weld foot I and the first bending section.

7. A stationary contact according to claim 6, characterized in that: In the first direction, the second bending segment is located between the first weld leg I and the first weld leg II; the thickness of the first weld leg I and the first weld leg II is d1, and there is a gap d3 between the second bending segment and the first weld leg I in the first direction, where d3 is not less than d1.

8. A disconnecting switch, comprising an operating unit layer and a switching unit layer, wherein the operating unit layer is used to control the connection and disconnection of the switching unit layer; characterized in that: The switching unit layer includes at least one first switching unit layer, the first switching unit layer includes a first switching unit layer housing, a first stationary contact I and a first stationary contact II, the first stationary contact I being a stationary contact as described in any one of claims 1-7.

9. A disconnecting switch according to claim 8, characterized in that: The switching unit layer also includes a second switching unit layer, the number of which is 2-5 times the number of the first switching unit layers. The current carrying capacity of the first switching unit layer is greater than that of the second switching unit layer. The second switching unit layer includes a second switching unit layer housing, a second stationary contact I, and a second stationary contact II. The height dimension of the first switching unit layer housing is greater than that of the second switching unit layer housing. The second stationary contact I includes a second contact portion, a second connecting portion, and a second solder foot portion. The number of second solder feet in a single second switching unit layer is less than the number of first solder feet in a single first switching unit layer. The height dimension of the second connecting portion in a single second switching unit layer is less than the second total thickness of the first connecting portion in a single first switching unit layer. The current carrying capacity of the first stationary contact I is greater than that of the second stationary contact I.

10. A disconnecting switch according to claim 9, characterized in that: The first stationary contact II includes a first contact segment, a first wiring segment, and a first fastener. The first contact segment and the first wiring segment are electrically connected, and the first fastener is disposed on the first wiring segment. The second stationary contact II includes a second contact segment, a second wiring segment, and a second fastener. The second contact segment and the second wiring segment are electrically connected, and the second fastener is disposed on the second wiring segment. The first fastener is larger than the second fastener, the first contact segment is thicker than the second contact segment, and the first wiring segment is thicker than the second wiring segment. The current carrying capacity of the first stationary contact II is greater than that of the second stationary contact II.

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