Modular dual power transfer switch

Abstract

A modular dual power transfer switch comprises a base, at least one switch module each comprising n driving mechanisms and n breaking unit groups arranged side by side along a length direction, wherein n is an integer greater than or equal to 2, the driving mechanisms are configured to be stacked with the respective breaking unit groups along a height direction and configured to drive the respective breaking unit groups, and the breaking unit groups each comprise at least one breaking unit having a common rotation axis; and a synchronization mechanism each comprising a synchronization component and a transmission component, the synchronization component is arranged between adjacent driving mechanisms to enable the driving mechanisms to move synchronously, and the transmission component is configured to simultaneously transmit driving forces of the adjacent driving mechanisms to the respective breaking unit groups to synchronously drive the rotation axes of the respective breaking unit groups to rotate.

Description

Technical Field

[0001] This disclosure relates to a modular dual-power transfer switch. Background Technology

[0002] Dual power transfer switches (ATS) are widely used in industrial fields, especially in emergency power supply systems, as key electrical components ensuring continuous power supply. Based on the power circuit conditions, dual power transfer switches can switch the load circuit from one power source to another, such as switching between mains power and a backup power source, thereby maintaining the continuous and reliable operation of the load circuit. Currently, dual power transfer switches are classified into two-stage (two-position) and three-stage (three-position) types according to their operating positions (also known as operating sections).

[0003] Typically, a dual-power transfer switch can be divided into two main modules: a disconnecting unit module and a drive mechanism module. The main functional components of the disconnecting unit are the moving and stationary contacts. The switching of power is achieved by the opening and closing of the moving and stationary contacts. The drive mechanism provides power to the disconnecting unit to realize the power switching.

[0004] Like other low-voltage electrical appliances, dual-power transfer switches (ATS) are often marketed as a series with different current ratings. These different frame products use the same technology, differing only in the geometric enlargement or reduction of components, resulting in a very large number of parts in such a series of ATS products. However, compared to protective electrical devices such as circuit breakers, the market demand for dual-power transfer switches is relatively small; therefore, their investment cost relative to component costs is relatively high. As with other commodities, the cost-effectiveness of dual-power transfer switches has always been a focus for consumers. Therefore, how to build more products with lower investment has been a key concern in this field. In other words, how to build high-current rated ATSs using existing low-current rated ATSs is a problem that needs to be solved in this field. Summary of the Invention

[0005] This disclosure provides a modular dual power transfer switch that uses an expandable modular construction, allowing for the construction of a reliable and efficient dual power transfer switch with a larger rated current through simple splicing, thereby reducing investment in a series of products and lowering costs.

[0006] In one aspect, this disclosure provides a modular dual-power transfer switch, the dual-power transfer switch comprising:

[0007] The base has a length direction and a height direction;

[0008] At least one switch module is arranged side-by-side on the base along the length direction, and each includes n drive mechanisms and n breaking unit groups arranged side-by-side along the length direction, where n is an integer greater than or equal to 2. The drive mechanisms are configured to overlap with their respective breaking unit groups along the height direction and to drive their respective breaking unit groups. Each breaking unit group includes at least one breaking unit having a common rotation axis.

[0009] A synchronization mechanism includes a synchronization component and a transmission component. The synchronization component is disposed between adjacent drive mechanisms to enable the drive mechanisms to move synchronously. One end of the transmission component is disposed between adjacent drive mechanisms of a corresponding switch module, and the other end is disposed between corresponding disconnection unit groups. The transmission component is configured to simultaneously transmit the driving force of the adjacent drive mechanisms to the corresponding disconnection unit groups to synchronously drive the rotating shaft of the corresponding disconnection unit groups to rotate, thereby performing opening and closing operations.

[0010] In one embodiment, the dual power transfer switch includes a switch module, and the synchronization component includes a manual operating device disposed between the drive mechanisms of the switch module and configured to synchronously drive the drive mechanisms of the switch module.

[0011] In one embodiment, the dual power transfer switch includes at least two switch modules, and the synchronization component includes a manual operating device and a synchronization rod. The synchronization rod is disposed between adjacent drive mechanisms of the corresponding switch modules, and the manual operating device is disposed between two adjacent switch modules and configured to synchronously drive the drive mechanisms of the two adjacent switch modules.

[0012] In one embodiment, adjacent disconnecting units in adjacent switching modules are fixed together, and their respective rotation axes are connected together or have a common rotation axis.

[0013] In one embodiment, the switch module is detachably mounted on the base.

[0014] In one embodiment, the dual power transfer switch further includes electrical connection components, each of which is configured to connect the disconnecting units in the corresponding disconnecting unit group in parallel and has an output terminal capable of being connected to a load.

[0015] In one embodiment, the dual power transfer switch further includes a back plate disposed on the back side of the base opposite to the at least one switch module, and includes an inlet hole for fixing a first inlet terminal electrically connected to a first power supply and a second inlet terminal connected to a second power supply of the disconnecting unit.

[0016] In one embodiment, the dual power transfer switch further includes an insulating partition disposed between the base and the back plate, which separates the first input terminal and the second input terminal.

[0017] In one embodiment, the insulating partition is provided with an air passage, and the base and the back plate are respectively provided with air holes communicating with the air passage, so that the air passage connects the cavity where the contact mechanism of the breaking unit is located with the surrounding environment.

[0018] In one embodiment, the segmentation units of each segmentation unit group are fixed together by rod-shaped members that pass through mounting holes on the housing of the segmentation unit.

[0019] In one embodiment, the number of the switch modules and the number of disconnecting units in each disconnecting unit group can be set according to the rated current of the dual power transfer switch. Attached Figure Description

[0020] The advantages and objectives of this disclosure will be better understood from the preferred embodiments described below in conjunction with the accompanying drawings. The drawings are not to scale in order to better illustrate the relationships between the components. In the drawings:

[0021] Figure 1 A side view of one embodiment of a dual power transfer switch according to the present disclosure is shown;

[0022] Figure 2 A side perspective view of one embodiment of a dual power transfer switch according to the present disclosure is shown;

[0023] Figure 3 A perspective schematic diagram of one embodiment of a dual power transfer switch according to the present disclosure is shown;

[0024] Figure 4 A front schematic diagram of one embodiment of a dual power transfer switch according to the present disclosure is shown;

[0025] Figure 5 A schematic diagram of the base of one embodiment of the dual power transfer switch according to the present disclosure is shown;

[0026] Figure 6 A schematic diagram of an airway according to one embodiment of the dual power supply changeover switch of the present disclosure is shown;

[0027] Figure 7 A schematic diagram of the drive mechanism of an embodiment of the dual power transfer switch according to the present disclosure is shown; and

[0028] Figure 8 A partial schematic diagram of a disconnection unit group according to an embodiment of a dual power transfer switch of the present disclosure is shown. Detailed Implementation

[0029] Various embodiments according to this disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions of them are omitted. Unless otherwise specified, the terms "first direction," "second direction," "height direction," "length direction," "rotation direction," "left side," "right side," "front," "back side," etc., used herein are all described with respect to the accompanying drawings of this disclosure. The term "comprising A, B, C, etc." only indicates the order in which the included components A, B, C, etc., are arranged, and does not exclude the possibility of including other components between A and B and / or between B and C. The description of "first" and its variations is merely for distinguishing components and does not limit the scope of this disclosure; "first component" may be written as "second component," etc., without departing from the scope of this disclosure.

[0030] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of this disclosure, and schematically show the shapes of the parts and their interrelationships.

[0031] Below, refer to Figures 1 to 8 The preferred embodiments according to this disclosure are described in detail below.

[0032] Figure 1 A side view of a modular dual-power transfer switch according to an embodiment of the present disclosure is shown. Figure 2 A side perspective view of the dual power supply transfer switch is shown. Figure 3 A three-dimensional schematic diagram of a dual power supply transfer switch is shown. Figure 4 A front view of the dual power transfer switch is shown. Figure 5 The base of the dual power supply transfer switch is shown. Figure 6 The internal contact mechanism and air passage of the dual power transfer switch are shown. Figure 7 A schematic diagram of the drive mechanism for a dual power transfer switch is shown. Figure 8 A partial schematic diagram of the disconnecting unit group of the dual power supply transfer switch is shown. The dual power supply transfer switch of this disclosure can switch between a dual-disconnect state, a first power-on state, and a second power-on state, or it can switch only between the first power-on state and the second power-on state. Figure 4 As shown, the dual power transfer switch disclosed herein can be a four-pole product. Of course, the number of poles of the product can be designed according to user needs, and this disclosure does not limit this.

[0033] like Figures 1 to 4As shown, the modular dual-power transfer switch includes a base 100, at least one switch module, and a synchronization mechanism. The base 100 has a length direction and a height direction, the length direction being... Figure 4 The horizontal y-direction to the right, and the height direction is... Figure 1 and 4 The vertically upward x-direction.

[0034] like Figure 3 and 4 As shown, at least one switch module may include a first switch module 1 and a second switch module 2, such as Figure 4 As shown by the dashed box in the figure, they are arranged side by side along the length direction y on the base 100, for example, on the front or front side of the base 10. The number of switch modules in this disclosure is not limited to the number shown in the figure, and can be three, four, five, etc., depending on the rated current of the required dual power transfer switch and the driving force of the mechanical structure.

[0035] At least one switch module, namely, each of the first switch module 1 and the second switch module 2, includes n drive mechanisms and n breaking unit groups arranged side by side along the length direction y, where n is an integer greater than or equal to 2, such as 2, 3, 4, or 5. Figure 3 and 4 In the example shown, n is 2. That is, each switch module contains 2 drive mechanisms and 2 disconnection unit groups. Figure 4 The first switch module 1 includes drive mechanisms 3 and 4 and disconnection unit groups 5 and 6, and the second switch module 2 includes drive mechanisms 7 and 8 and disconnection unit groups 9 and 10.

[0036] Furthermore, each of the segmentation unit groups includes at least one segmentation unit having a common rotation axis 16, for example... Figure 4 Each of the breaking unit groups 5, 6, 9, and 10 contains two breaking units. Of course, in other embodiments, the breaking unit group may contain more breaking units, such as three, four, etc. It is also possible for each breaking unit group to include one breaking unit. The breaking units of this disclosure can be commercially available breaking units of Beat Contact or Jaw Contact structure, thus allowing the dual power transfer switch of this disclosure to select the number of breaking units as needed, thereby reducing costs.

[0037] See you again Figure 4The drive mechanisms are configured to be stacked along the height direction with their respective segmentation unit groups and to drive their respective segmentation unit groups. Specifically, drive mechanism 3 is positioned above segmentation unit group 5 and can drive segmentation unit group 5; drive mechanism 4 is positioned above segmentation unit group 6 and can drive segmentation unit group 6; drive mechanism 7 is positioned above segmentation unit group 9 and can drive segmentation unit group 9; and drive mechanism 8 is positioned above segmentation unit group 10 and can drive segmentation unit group 10. Of course, the arrangement of the drive mechanisms and segmentation unit groups can be the same as... Figure 4 In contrast, the drive mechanism is located below the segmentation unit group.

[0038] The number of switch modules and the number of breaking units in each breaking unit group can be preset or selected in advance. For example, if one drive mechanism can drive two breaking units, and one breaking unit has a smaller rated current of 125A, the user needs one switch module in a 500A high-rated current dual power transfer switch. This switch module contains two drive mechanisms and four breaking units. The user needs two such switch modules in a 1000A high-rated current dual power transfer switch, resulting in a total of four drive mechanisms and eight breaking units. Similarly, if one drive mechanism can drive one breaking unit, and one breaking unit has a smaller rated current of 125A, the user needs one switch module in a 250A rated current dual power transfer switch. This switch module contains two drive mechanisms and two breaking units. The user needs two such switch modules in a 500A high-rated current dual power transfer switch. The breaking unit described here can be understood as a small-current breaking unit that can be obtained without redesign, and can be considered a basic module of modular design. That is, the number of switch modules and the number of breaking units in each breaking unit group can be set according to user needs, for example, based on the rated current of the dual-power transfer switch required by the user. In this way, by splicing and combining, a dual-power transfer switch with a large rated current can be obtained using breaking units with small rated current and drive mechanisms. It should be noted that the rated current of a single breaking unit mentioned above is for illustrative purposes only; other values ​​may exist in other examples, depending on the specific design of the smallest unit.

[0039] like Figure 4 and 8 As shown, adjacent breaking unit groups in adjacent switch modules are fixed together, and their respective rotation axes 16 are connected together or have a common rotation axis 16. Specifically, the breaking unit group 6 of the first switch module 1 and the breaking unit group 9 of the second switch module 2 are fixed together and have a common rotation axis 16. The rotation axis 16 can rotate about its rotation axis, thereby driving the moving contacts 17 of each breaking unit disposed thereon (e.g., ...). Figure 6 (As shown) It can move between the first power-on position, the second power-on position, and the dual-position. Furthermore, the breaking units of each breaking unit group can be fixed together by rod-shaped members 23, which pass through mounting holes on the housing of the breaking unit, such as... Figure 8 As shown. During assembly, the segmentation units of the segmentation unit group can be assembled together first, and then the segmentation unit group can be installed on the base 100.

[0040] like Figure 3 As shown, the switch module is detachably mounted on the base 100, for example, via threaded fasteners. Of course, other engagement methods are also possible. Figure 5 As shown, the base 100 is provided with a positioning member 33 for positioning the segmentation unit assembly and a fastening hole 34 for mounting the segmentation unit assembly, as well as a further positioning member 35 for positioning the drive mechanism and a further fastening hole 36 for mounting the drive mechanism. The positioning member 33 and the further positioning member 35 may have the form of a protrusion or a recess.

[0041] The base fixes the drive mechanism of the switch module, realizing the dimensional relationship between the drive mechanisms of different switch modules, for example, the shortest dimensional chain, and the synchronization of multiple drive mechanisms can be ensured by the synchronization mechanism described below. Furthermore, the base fixes the breaking unit of the switch module, realizing the dimensional relationship between the breaking units of different switch modules, for example, the shortest dimensional chain, and the synchronization of multiple breaking units can be ensured by the synchronization mechanism described below and a common rotation axis. Therefore, the base can realize the dimensional relationship between the drive mechanism and the breaking units of the breaking unit group, for example, the shortest dimensional chain, thereby ensuring the effectiveness of the drive.

[0042] When a breaking unit group contains more than one breaking unit, it is necessary to electrically connect the breaking units of the breaking unit group to achieve the breaking of large currents. For this purpose, as follows... Figures 1 to 4 As shown, the dual power transfer switch also includes electrical connection components 18, each of which is configured to connect the disconnecting units in the corresponding disconnecting unit group in parallel and has an output terminal 19 that can be connected to the load.

[0043] Considering the fixed input and output terminals of the dual power transfer switch, the dual power transfer switch may also include a backplate 200. For example... Figures 1 to 2As shown, the backplate 200 is disposed on the back of the base 100 away from at least one switch module, and includes inlet holes for fixing a first inlet terminal 20 electrically connected to a first power supply and a second inlet terminal 21 connected to a second power supply for fixing the disconnecting unit. Furthermore, the backplate 200 also includes an output hole for fixing an output terminal 19 of the electrical connection component 18. Of course, in other examples, the output terminal 19 may be located in other positions. By providing a backplate to reinforce the various terminals, the dual power transfer switch achieves strong overall integrity, robustness, and reliability.

[0044] In an optional embodiment, the base 100 accordingly includes additional inlet holes for the first inlet 20 and the second inlet 21, and additional outlet holes for the outlet 19 of the electrical connection member 18.

[0045] Furthermore, when the distance between the first input terminal 20, which is electrically connected to the first power supply, and the second input terminal 21, which is connected to the second power supply, of the disconnecting unit is too close, the dual power supply transfer switch may also include an insulating partition 300. For example... Figure 6 As shown, the insulating partition 300 is disposed between the base 100 and the back plate 200, and is used to separate the first input terminal 20 and the second input terminal 21. The insulating partition 300 can be used to increase the electrical clearance and avoid short circuits between the first input terminal and the second input terminal.

[0046] like Figure 6 As shown, an air passage 22 can be provided on the insulating partition 300 (the thicker black solid line in the figure shows the extension path of the air passage), and air holes communicating with the air passage 22 are respectively provided on the base 100 and the back plate 200 (e.g., Figure 5 The vent 32 on the base 100 shown in the diagram allows the air passage to connect the cavity where the contact mechanism of the disconnecting unit is located to the surrounding environment, such as the atmosphere. In this way, the gas generated by the contact mechanism of the disconnecting unit during opening and closing operations can be discharged to the outside of the dual power transfer switch, reducing the risk of the gas damaging the contact mechanism.

[0047] To achieve synchronous driving of the various disconnecting units in a dual-power transfer switch, a synchronization mechanism is required. This mechanism may include a synchronization component and a transmission component. The synchronization component is positioned between adjacent drive mechanisms to enable synchronized movement. One end of the transmission component is positioned between adjacent drive mechanisms of the corresponding switch module, and the other end is positioned between corresponding disconnecting unit groups. It is configured to simultaneously transmit the driving force of the adjacent drive mechanisms to the corresponding disconnecting unit groups, synchronously driving the rotation shafts of the corresponding disconnecting unit groups to rotate, thereby performing opening and closing operations. For example, the synchronization component may include a manual operating device, or both a manual operating device and a synchronization lever. Specifically, Figure 4The left-hand switch module 1 is equipped with a synchronizing rod 11 and a transmission assembly 12, while the right-hand switch module 2 is equipped with a synchronizing rod 13 and a transmission assembly 14. For example, the synchronizing rod 11 is positioned between adjacent drive mechanisms 3 and 4 of the first switch module 1, connecting the rotatable drive components of the drive mechanisms 3 and 4 together so that they can move synchronously. One end of the transmission assembly 12 is positioned between adjacent drive mechanisms 3 and 4, and the other end is positioned between corresponding breaking unit groups 5 and 6, configured to simultaneously transmit the driving force of adjacent drive mechanisms 3 and 4 to the corresponding breaking unit groups 5 and 6. The synchronizing rod 13 and transmission assembly 14 have similar arrangements, which will not be described further here. Figure 3 and 4 As shown, when the dual power transfer switch includes at least two switch modules, such as two switch modules, the synchronization component may further include a manual operating device 15, which is disposed between two adjacent switch modules 1 and 2 and configured to synchronously drive the drive mechanisms of the two adjacent switch modules. For example, the manual operating device 15 synchronously drives the drive mechanism 4 of the first switch module 1 and the drive mechanism 7 of the second switch module 2 (e.g., by connecting to rotatable drive members of drive mechanisms 4 and 7), thereby ensuring the synchronicity of the drive mechanisms of the two switch modules together with the synchronization rods 11 and 13. When the dual power transfer switch includes only one switch module, the synchronization component may consist only of a manual operating device disposed between the drive mechanisms of the single switch module and configured to synchronously drive the drive mechanism of the single switch module.

[0048] For example, such as Figure 7 As shown, drive mechanisms 3, 4, 7, and 8 may each include a drive element 24 capable of rotating around a first axis A. The drive element 24, as the output element of the drive mechanism, outputs driving force to transmission assemblies 12 and 14. Transmission assemblies 12 and 14 each include a drive rod 25, a crank arm 26, a support rod 27, and a guide element 28. The drive rod 25 is driven along its longitudinal axis L (e.g., ...). Figure 7 (as shown by the dashed line) extends and includes first ends (as opposed to each other along the longitudinal axis L) Figure 7 The right side of the middle end) and the second end ( Figure 7 One end is connected to the drive member 24 of the drive mechanism, and the other end is connected to the crank arm 26. The crank arm 26 is rotatably and fixedly connected to the rotating shaft 16 of the breaking unit.

[0049] The transmission rod 25 is rotatably connected to the housing of the drive mechanism or the housing of the switch (not shown), so that it can rotate along its axis of rotation. The transmission rod 25 is rotatably connected to the housing of the drive mechanism via a support rod 27 extending along a second axis B parallel to the length direction.

[0050] The drive mechanism is driven by an external driving force, causing each drive component 24 to rotate around the first axis A, thereby driving the transmission rod 25 to rotate around the second axis B, which in turn drives the crank arm 26 to rotate, and finally drives the rotating shaft 16 to rotate around its extension axis C.

[0051] The connection between the transmission rod 25 and the drive member 24 at its first end can be exemplarily achieved by a guide member 28 having a guide groove 281. The guide member 28 is connected to the transmission rod 25 at its first end, and the guide groove 281 of the guide member 28 extends along the longitudinal axis L. The drive member 24 may have a mating portion that is accommodated within the guide groove 281 and is capable of sliding along the guide groove 281. Two guide members 28 are provided on opposite surfaces of the transmission rod 25 to respectively mate with the drive members 24 of the drive mechanisms located on both sides of the transmission assembly. Therefore, the transmission mechanism proposed in this disclosure allows two drive mechanisms in a switching module to be driven simultaneously and synchronously.

[0052] The transmission rod 25 may include a transmission groove 30 at its second end. The transmission groove 30 extends along the longitudinal axis L and is a through groove penetrating the transmission rod 25. The transmission groove 30 is a straight groove with semi-circular ends. Correspondingly, the crank arm 26 may include a joint portion 31 extending parallel to the extension axis C. The joint portion 31 is offset from the extension axis C, so that the crank arm 26 can be rotated by driving the joint portion 31.

[0053] like Figure 4 and Figure 7-8 The synchronization mechanism ensures that the two drive mechanisms in a switch module can be driven synchronously at the same time. Of course, even when a switch module contains three drive mechanisms, synchronous driving can be achieved by properly configuring the synchronization rod, manual operating device, and transmission components. Similarly, this disclosure can also realize switch modules with more drive mechanisms.

[0054] The design of the transmission component of the above-mentioned synchronization mechanism is only an example. This disclosure may also include transmission components with other structures, such as equivalent variations of the above structure.

[0055] The dual power transfer switch disclosed herein employs a scalable modular construction, enabling the creation of reliable and efficient dual power transfer switches with higher rated current through simple assembly. The dual power transfer switch of this disclosure requires fewer specialized parts for its housing (significantly fewer compared to known solutions), thus reducing investment in product series, shortening product development cycles, and lowering product costs. Furthermore, the automation of the design of the dual power transfer switch of this disclosure allows for greater efficiency, and the consistency of each module in the product results in higher product quality.

[0056] The technical features disclosed above are not limited to the combinations of the disclosed features with other features. Those skilled in the art may also make other combinations of the technical features according to the purpose of the disclosure in order to achieve the purpose of this disclosure.

Claims

1. A modular dual-power transfer switch, characterized in that, The dual power supply transfer switch includes: The base has a length direction and a height direction; At least one switch module is arranged side-by-side on the base along the length direction, and each includes n drive mechanisms and n breaking unit groups arranged side-by-side along the length direction, where n is an integer greater than or equal to 2. The drive mechanisms are configured to overlap with their respective breaking unit groups along the height direction and to drive their respective breaking unit groups. Each breaking unit group includes at least one breaking unit having a common rotation axis. A synchronization mechanism includes a synchronization component and a transmission component. The synchronization component is disposed between adjacent drive mechanisms to enable the drive mechanisms to move synchronously. One end of the transmission component is disposed between adjacent drive mechanisms of a corresponding switch module, and the other end is disposed between corresponding disconnection unit groups. The transmission component is configured to simultaneously transmit the driving force of the adjacent drive mechanisms to the corresponding disconnection unit groups to synchronously drive the rotating shaft of the corresponding disconnection unit groups to rotate, thereby performing opening and closing operations.

2. The dual power supply transfer switch according to claim 1, characterized in that, The dual power transfer switch includes a switch module, and the synchronization component includes a manual operating device, which is disposed between the drive mechanisms of the switch module and configured to synchronously drive the drive mechanisms of the switch module.

3. The dual power supply transfer switch according to claim 1, characterized in that, The dual power transfer switch includes at least two switch modules. The synchronization component includes a manual operating device and a synchronization rod. The synchronization rod is disposed between adjacent drive mechanisms of the corresponding switch modules. The manual operating device is disposed between two adjacent switch modules and configured to synchronously drive the drive mechanisms of the two adjacent switch modules.

4. The dual power supply transfer switch according to claim 3, characterized in that, Adjacent switching modules have adjacent disconnecting units fixed together, and their respective rotating shafts are connected together or have a common rotating shaft.

5. The dual power supply transfer switch according to claim 1, characterized in that, The switch module is detachably mounted on the base.

6. The dual power supply transfer switch according to claim 1, characterized in that, The dual power transfer switch also includes electrical connection components, each of which is configured to connect the disconnecting units in the corresponding disconnecting unit group in parallel and has an output terminal that can be connected to the load.

7. The dual power supply transfer switch according to claim 1, characterized in that, The dual power transfer switch also includes a back plate, which is disposed on the back side of the base opposite to the at least one switch module, and includes an inlet hole for fixing the first inlet terminal of the disconnecting unit that is electrically connected to the first power supply and the second inlet terminal that is connected to the second power supply.

8. The dual power supply transfer switch according to claim 7, characterized in that, The dual power transfer switch also includes an insulating partition, which is disposed between the base and the back plate and separates the first input terminal and the second input terminal.

9. The dual power supply transfer switch according to claim 8, characterized in that, The insulating partition is provided with an air passage, and the base and the back plate are respectively provided with air holes communicating with the air passage, so that the air passage connects the cavity where the contact mechanism of the breaking unit is located with the surrounding environment.

10. The dual power supply transfer switch according to claim 7, characterized in that, The individual segmentation units of each segmentation unit group are fixed together by rod-shaped members that pass through mounting holes on the housing of the segmentation unit.

11. The dual power supply transfer switch according to claim 1, characterized in that, The number of switch modules and the number of disconnecting units in each disconnecting unit group can be set according to the rated current of the dual power transfer switch.

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