A shut-off for a photovoltaic module

Abstract

This invention discloses a switch for photovoltaic modules, belonging to the field of photovoltaic module technology. It includes a switch body with a negative external terminal and a positive external terminal connected to it. The negative and positive external terminals are electrically connected to two or more junction boxes, respectively. The two junction boxes are electrically connected to two adjacent photovoltaic modules, and the two sets of junction boxes are electrically connected to two adjacent sets of photovoltaic modules. The switch body is used to cut off the path between two or more adjacent photovoltaic modules. This invention connects the positive and negative terminals of the switch body to the junction boxes of two or more adjacent photovoltaic modules, respectively, cutting off the path between adjacent photovoltaic modules through the switch body. This indirectly blocks the path between the photovoltaic modules and the inverter or combiner box, reducing the complexity of the switch body's wiring, avoiding cumbersome wiring, and also reducing the size of the switch body.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology and relates to photovoltaic module shutdown technology. Specifically, it is a shutdown device for photovoltaic modules, which aims to shut off two or more adjacent photovoltaic modules, thereby indirectly blocking the path between the photovoltaic modules and the inverter or combiner box. Background Technology

[0002] A circuit breaker in a photovoltaic (PV) module is a device that disconnects the PV module (solar panel) from the circuit in some way, thereby stopping the solar panel from continuing to output current to the circuit. Circuit breakers can shut off the path between the PV module and the inverter or combiner box in cases of circuit faults, safety maintenance, and to prevent reverse current, reducing the risk of electric shock and addressing the "rescue risk" in PV systems. This fulfills the fire safety requirements of rooftop PV systems, enabling the PV module to shut down, ensuring its safe operation and extending its lifespan.

[0003] In traditional technology, the switch for photovoltaic modules is designed with a "two-in, two-out" approach. That is, one photovoltaic module corresponds to one switch with two positive and two negative terminals for inflow and two positive and two negative terminals for outflow. See patent document with application number CN202421851325.6, which discloses a switch for the field of photovoltaic technology. Specifically, see the attached figure of the patent document. It has two wiring ports at both ends of the main body, which are used as the positive and negative terminals for inflow and outflow of the switch, respectively. This structure not only has the technical problem of complicated wiring, resulting in a large size of the switch, but also has the technical problem of affecting the switching effect. Utility Model Content

[0004] In view of the technical problems described in the background art above, the existing switch structure not only has the technical problems of complicated wiring, resulting in large switch size and affecting the switching effect, but also proposes a switch for photovoltaic modules to address these technical problems.

[0005] This invention changes the traditional design approach of directly cutting off the path between photovoltaic modules and inverters or combiner boxes. Instead, the positive and negative terminals of the switch body are connected to the junction boxes of two or more adjacent photovoltaic modules. When it is necessary to cut off the path between the photovoltaic modules and the inverter or combiner box, the path between the two or more adjacent photovoltaic modules is cut off through the switch body, thereby indirectly blocking the path between the photovoltaic modules and the inverter or combiner box. This not only reduces the number of wiring ports on the switch body, lowers the complexity of wiring, and avoids cumbersome wiring, but also reduces the number of circuit components in the switch body, thus reducing its size. Furthermore, the method of cutting off two or more photovoltaic modules in this invention also prevents current from flowing between the two or more photovoltaic modules, thereby improving the shutdown effect.

[0006] To solve the above-mentioned technical problems, the present invention proposes the following technical solution:

[0007] This utility model discloses a switch for photovoltaic modules, comprising a switch body with a negative external terminal and a positive external terminal connected to it. The negative external terminal and the positive external terminal are respectively electrically connected to two or two sets of junction boxes. The two junction boxes are respectively electrically connected to two adjacent photovoltaic modules, and the two sets of junction boxes are respectively electrically connected to two adjacent sets of photovoltaic modules. The switch body is used to cut off the path between two or two adjacent sets of photovoltaic modules.

[0008] Further defining the switch body, the switch body includes a lower housing, and the negative external terminal and the positive external terminal are located on opposite sides of the lower housing.

[0009] Furthermore, the switch body also includes a negative electrode connecting piece, a positive electrode connecting piece, a negative electrode lead, a positive electrode lead, and a switch-off module disposed in the internal cavity of the switch body;

[0010] One end of the negative electrode external terminal extends to the outside of the switch body, and the other end is located in the inner cavity of the switch body and is electrically connected to the negative electrode connecting piece. The negative electrode connecting piece, the negative electrode lead and the switch module are electrically connected in sequence from front to back.

[0011] One end of the positive electrode external terminal extends to the outside of the switch body, and the other end is located in the inner cavity of the switch body and is electrically connected to the positive electrode connecting piece. The positive electrode connecting piece, the positive electrode lead, and the switch module are electrically connected in sequence from front to back.

[0012] Furthermore, the switch body also includes a negative transition connector and a positive transition connector. The positive transition connector is used to electrically connect the positive connecting piece and the positive lead, and the negative transition connector is used to electrically connect the negative connecting piece and the negative lead.

[0013] Further specified, a sealant filling cavity is provided in the inner cavity of the switch body. The sealant filling cavity refers to the unoccupied idle space in the inner cavity of the switch body, and the volume of the idle space is not less than 80% of the volume of the inner cavity of the switch body.

[0014] Furthermore, the lower housing is provided with a snap-fit ​​platform for snapping the shutdown module.

[0015] Further specifying, the lower housing is provided with a limiting plate, a limiting post and a locking platform, and the locking platform is formed by the lower housing, the limiting plate, the limiting post and the locking platform together.

[0016] Furthermore, the switch for photovoltaic modules also includes an upper cover, which is located at the top opening of the lower housing and is snapped into the lower housing. The upper cover and the lower housing together enclose the inner cavity of the switch body.

[0017] Further specifying, the two inner sidewalls opposite to each other of the lower housing are provided with upper cover limiting surfaces, and the upper cover limiting surfaces are inclined surfaces that face the lower housing.

[0018] Further, the outer wall of the upper cover and / or lower shell is provided with a cable tie slot, the cable tie slot is used to accommodate a cable tie, and the cable tie is used to fasten the upper cover and lower shell.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model discloses a switch for photovoltaic modules. The switch body has only one negative external terminal and one positive external terminal connected. These terminals are respectively connected to the junction boxes of two or more adjacent photovoltaic modules. When it is necessary to disconnect the path between the photovoltaic modules and the inverter or combiner box, the path between the two or more adjacent photovoltaic modules is interrupted through the switch body, thereby indirectly blocking the path between the photovoltaic modules and the inverter or combiner box. This utility model changes the traditional design concept of directly disconnecting the path between the photovoltaic modules and the inverter or combiner box. It not only reduces the number of wiring ports on the switch body, lowers the complexity of wiring, and avoids cumbersome wiring, but also reduces the number of circuit components in the switch, shrinking the size of the switch body and making it more suitable for practical applications. The method of disconnecting two or more photovoltaic modules also prevents current from flowing between the two or more photovoltaic modules, thereby improving the shutdown effect and ensuring safety.

[0021] 2. The switch body of this utility model has a large gap between the switch module and the lower housing, allowing ribs to be installed within this gap. This fixes the switch module away from the four inner sidewalls of the lower housing, providing better anti-collision and sealing effects. Furthermore, this utility model utilizes all unused space within the switch body's internal cavity as a sealant filling chamber, increasing the amount of sealant filled. The sealant also enhances the heat dissipation of the switch module through its excellent thermal conductivity.

[0022] 3. The present invention also provides a horizontal fixing plate and a vertical fixing plate inside the lower housing. The horizontal fixing plate and the vertical fixing plate enhance the strength of the lower housing itself and protect the shutdown module inside the lower housing, further preventing the shutdown module from being damaged when it is impacted.

[0023] 4. This utility model provides a snap-fit ​​platform inside the lower housing for snapping the shut-off module. The snap-fit ​​platform is used to snap the shut-off module, which improves the stability of the shut-off module connection.

[0024] 5. This utility model not only snaps the upper cover body and the lower shell together, but also secures the upper cover body and the lower shell body with cable ties, which improves the firmness of the connection between the upper cover body and the lower shell body and prevents the upper cover body and the lower shell body from being misaligned or separated.

[0025] 6. The present invention provides upper cover limiting surfaces on two opposite inner side walls of the lower shell. The upper cover limiting surfaces play a clamping role on the upper cover, further improving the firmness of the connection between the upper cover and the lower shell. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the connection between the switch and the photovoltaic module of this utility model;

[0027] Figure 2 This is a schematic diagram of the upper and lower housings of the switch of this utility model;

[0028] Figure 3 This is a schematic diagram of the interior of the upper and lower housings of the switch of this utility model;

[0029] Figure 4 This is a schematic diagram showing the connection between the lower shell and the upper cover.

[0030] Figure 5 This is a schematic diagram of the limiting surface of the upper cover.

[0031] Figure 6 This is a schematic diagram of the cable tie slot structure;

[0032] Explanation of reference numerals in the attached drawings: 1-Switch body, 101-Negative external terminal, 102-Positive external terminal, 103-Lower housing, 1031-First vertical fixing plate, 1032-Limiting plate, 1033-Second vertical fixing plate, 1034-Limiting post, 1035-First horizontal fixing plate, 1036-Second horizontal fixing plate, 1037-Third vertical fixing plate, 1038-First locking platform, 1039-Second locking platform, 103 10-Fourth vertical fixing plate, 103-11-Third horizontal fixing plate, 104-Negative electrode connecting piece, 105-Positive electrode connecting piece, 106-Negative electrode transition connector, 107-Positive electrode transition connector, 108-Negative electrode lead, 109-Positive electrode lead, 110-Shut-off module, 111-Sealant filling cavity, 112-Card slot, 113-Upper cover, 114-Snap fastener, 115-Upper cover limiting surface, 116-Cable tie slot;

[0033] 2- Junction box;

[0034] 3- Photovoltaic modules. Detailed Implementation

[0035] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0036] See Figure 1 This utility model proposes a switch for photovoltaic modules, including a switch body 1. The switch body 1 has a negative external terminal 101 and a positive external terminal 102 connected to it. The negative external terminal 101 and the positive external terminal 102 are respectively electrically connected to two or two sets of junction boxes 2, forming a "one-in-one-out" wiring structure. The two junction boxes 2 are respectively electrically connected to two adjacent photovoltaic modules 3, that is, the negative external terminal 101 is connected to the negative terminal of the junction box 2 of one photovoltaic module 3, and the positive external terminal 102 is connected to the positive terminal of the junction box 2 of one photovoltaic module 3. The two sets of junction boxes 2 are respectively electrically connected to two adjacent sets of photovoltaic modules, that is, the negative external terminal 101 can be used to connect to the negative terminals of multiple junction boxes 2 of photovoltaic modules 3 at the same time, and the positive external terminal 102 can be used to connect to the positive terminals of multiple junction boxes 2 of photovoltaic modules 3 at the same time. When a fault or emergency occurs, the switch body 1 is used to cut off the path between two or two sets of adjacent photovoltaic modules 3. This invention can also prevent current from flowing between two or two groups of photovoltaic modules 3 by cutting off two or two sets of photovoltaic modules 3, thereby improving the shutdown effect.

[0037] See Figure 2In this utility model, the switch body 1 includes a lower housing 103, with the negative external terminal 101 and the positive external terminal 102 located on opposite sides of the lower housing 103, which facilitates the connection of the negative external terminal 101 and the positive external terminal 102 with the junction boxes 2 on two or more adjacent photovoltaic modules 3.

[0038] In this invention, the switch body 1 further includes a negative electrode connecting piece 104, a positive electrode connecting piece 105, a negative electrode transition connector 106, a positive electrode transition connector 107, a negative electrode lead 108, a positive electrode lead 109, and a switch-off module 110 disposed in the inner cavity of the switch body 1; one end of the negative electrode external terminal 101 extends to the outside of the switch body 1 and is connected to the negative electrode of the junction box of one or a group of photovoltaic modules, and the other end is located in the inner cavity of the switch body 1 and is electrically connected to the negative electrode connecting piece 104. The negative electrode connecting piece 104, the negative electrode transition connector 106, the negative electrode lead 108, and the shutdown module 110 are electrically connected in sequence from front to back. One end of the positive electrode external terminal 102 extends to the outside of the shutdown body 1 and is connected to the positive electrode of the junction box of one or a group of photovoltaic modules. The other end is located in the inner cavity of the shutdown body 1 and is electrically connected to the positive electrode connecting piece 105. The positive electrode connecting piece 105, the positive electrode transition connector 107, the positive electrode lead 109, and the shutdown module 110 are electrically connected in sequence from front to back. Preferably, the negative electrode connecting piece 104, the negative electrode transition connector 106, the negative electrode lead 108, and the shut-off module 110 are connected by welding. In addition, they can be connected by other methods known to those skilled in the art, such as screws or adhesive bonding. The positive electrode connecting piece 105, the positive electrode transition connector 107, the positive electrode lead 109, and the shut-off module 110 are connected by welding. In addition, they can be connected by other methods known to those skilled in the art, such as screws or adhesive bonding.

[0039] In this invention, a sealant-filled cavity 111 is provided in the inner cavity of the switch body 1. The sealant-filled cavity 111 refers to the unoccupied idle space in the inner cavity of the switch body 1, that is, the space not occupied by the negative electrode connecting piece 104, positive electrode connecting piece 105, negative electrode transition connector 106, positive electrode transition connector 107, negative electrode lead 108, positive electrode lead 109, switch module 110, and other structures. The volume of the idle space is not less than 80% of the volume of the inner cavity of the switch body 1.

[0040] In order to reduce size, traditional circuit breakers usually have a tight gap between the shutdown module and the housing. When the housing is impacted, the shutdown module is easily damaged. In addition, the limited internal space means that more sealant cannot be filled, which makes the sealant prone to cracking, reducing the sealing effect and making it easy for water to enter and cause damage.

[0041] The switch body 1 of this utility model has a large gap between the switch module 110 and the lower housing 103. (See attached image) Figure 2 Ribs can be installed within this gap to fix the shut-off module away from the four inner sidewalls of the lower housing 103, thereby achieving better anti-collision and sealing effects. In addition, this invention uses all the unused space in the inner cavity of the shut-off body 1 as a sealant filling cavity 111, increasing the amount of sealant filling. The sealant can also improve the heat dissipation effect of the shut-off module through thermal conductivity.

[0042] Preferably, this invention includes a snap-fit ​​platform within the lower housing 103 for snapping onto the shut-off module 110. See details... Figure 3This invention further includes a horizontal fixing plate and a vertical fixing plate inside the lower housing 103. These plates enhance the strength of the lower housing 103 and protect the shut-off module 110 inside, further preventing damage to the shut-off module 110 upon impact. The horizontal fixing plate includes a first horizontal fixing plate 1035, a second horizontal fixing plate 1036, and a third horizontal fixing plate 10311. The vertical fixing plate includes a first vertical fixing plate 1031, a second vertical fixing plate 1033, a third vertical fixing plate 1037, and a fourth vertical fixing plate 10310. The first horizontal fixing plate 1035, the second horizontal fixing plate 1036, and the third horizontal fixing plate 10311 are all arranged along the length of the lower housing 103 within the inner cavity of the lower housing 103. One end of the first horizontal fixing plate 1035 is connected to the inner wall of the lower housing 103, and the other end is connected to the inner wall of the opposite side of the lower housing 103. The height of the middle position on the fixing plate 1035 is less than the height of the two sides, and the middle position is used to accommodate the shutdown module 110; the second horizontal fixing plate 1036 and the third horizontal fixing plate 10311 are located on the same straight line. One end of the second horizontal fixing plate 1036 is connected to the inner cavity wall of the lower housing 103, and the other end extends to the middle position of the lower housing 103; the third horizontal fixing plate 10311 is connected to the inner cavity wall of the lower housing 103 (opposite to the setting position of the second horizontal fixing plate 1036), and the second horizontal fixing plate 1036 and the third horizontal fixing plate 10311 are disconnected to allow the negative lead 108 and the positive lead 109 to pass through. The first vertical fixing plate 1031, the second vertical fixing plate 1033, the third vertical fixing plate 1037, and the fourth vertical fixing plate 10310 are all arranged along the width direction of the lower housing 103. The second vertical fixing plate 1033 and the third vertical fixing plate 1037 are located on one side of the shut-off module 110 and are staggered. The first vertical fixing plate 1031 and the fourth vertical fixing plate 10310 are located on the other side of the shut-off module 110 and are staggered. One end of the second vertical fixing plate 1033 is connected to the inner wall of the lower housing 103, and the other end passes through the first transverse fixing plate 1035 and the second transverse fixing plate 1031. The fixing plate 1036 is connected; one end of the third vertical fixing plate 1037 is connected to the inner wall of the lower housing 103 (opposite to the setting position of the second vertical fixing plate 1033), and the other end is connected to the second horizontal fixing plate 1036; one end of the first vertical fixing plate 1031 is connected to the inner wall of the lower housing 103, and the other end passes through the first horizontal fixing plate 1035 and is connected to the third horizontal fixing plate 10311; one end of the fourth vertical fixing plate 10310 is connected to the inner wall of the lower housing 103 (opposite to the setting position of the first vertical fixing plate 1031), and the other end is connected to the third horizontal fixing plate 10311.

[0043] The lower housing 103 of this utility model is provided with a limiting plate 1032, a limiting post 1034, and a locking platform. The locking platform is formed by the lower housing 103, the limiting plate 1032, the limiting post 1034, and the locking platform. The limiting plate 1032 is located between the first vertical fixing plate 1031 and the second vertical fixing plate 1033. One end of the limiting plate 1032 is connected to the inner cavity wall of the lower housing 103, and the other end extends to the middle of the lower housing 103 and is inclined, which facilitates the locking of the shut-off module 110 and can accommodate shut-off modules 110 of different heights, forming a firm locking effect.

[0044] Limiting posts 1034 are provided at the intersection of the first horizontal fixing plate 1035 and the second vertical fixing plate 1033 and at the intersection of the first horizontal fixing plate 1035 and the first vertical fixing plate 1031. One limiting post 1034 is used to connect the negative electrode transition connector 106, and the other limiting post 1034 is used to connect the positive electrode transition connector 107.

[0045] In this utility model, the carding platform is set on the side of the second horizontal fixing plate 1036 and the third horizontal fixing plate 10311 near the shut-off module 110. The carding platform includes a first carding platform 1038 and a second carding platform 1039. The first carding platform 1038 is set higher than the second carding platform 1039. The shut-off module 110 can be selected to be engaged by the first carding platform 1038 or the second carding platform 1039 according to the height of the shut-off module 110.

[0046] See Figure 4 The present invention, for a switchgear used in photovoltaic modules, also includes an upper cover 113. The upper cover 113 is located at the top opening of the lower housing 103 and is snapped into the lower housing 103. The upper cover 113 and the lower housing 103 together enclose the inner cavity of the switchgear body 1. Specifically, two slots 112 are provided on opposite sides of the lower housing 103, and corresponding buckles 114 are provided on the upper cover 113. The upper cover 113 is snapped into the lower housing 103 by the cooperation of the buckles 114 and the slots 112.

[0047] See Figure 5 The present invention provides upper cover limiting surfaces 115 on two opposite inner sidewalls of the lower housing 103. The upper cover limiting surfaces 115 are inclined surfaces that are inclined toward the lower housing 103. The upper cover limiting surfaces 115 can clamp the upper cover 113, further improving the firmness of the connection between the upper cover 113 and the lower housing 103.

[0048] Preferably, the lower shell 103 in this utility model has a cuboid structure and the upper cover 113 has a rectangular plate structure. In addition, the lower shell 103 can also be designed in a conventional form known to those skilled in the art, such as a cylindrical structure or a cubic structure, and the shape of the upper cover 113 can match the shape of the top opening of the lower shell 103.

[0049] See Figure 6 This invention provides cable tie slots 116 on the outer walls of the upper cover 113 and / or the lower housing 103. The cable tie slots 116 are used to accommodate cable ties, which are used to secure the upper cover 113 and the lower housing 103. Preferably, the cable tie slots 116 are provided solely on the upper cover 113 and are located near the four corners of the upper cover 113. Alternatively, the cable tie slots 116 can be provided solely on the lower housing 103, or they can be provided on both the upper cover 113 and the lower housing 103, as long as their positions on the upper cover 113 and the lower housing 103 correspond and do not affect the installation of the cable ties.

[0050] It should be noted that reducing the size of the circuit breaker is one of the key technological challenges currently facing circuit breakers. Therefore, reducing the size of the circuit breaker is also one of the core technological concepts of this invention. Because photovoltaic modules need to be connected to their junction boxes and then to the building structure, and because a large number of circuit breakers are required—almost every photovoltaic module needs a corresponding circuit breaker—the size of the circuit breaker directly affects the size of the photovoltaic module and the aesthetics of the installation. Therefore, the size of the circuit breaker is extremely important in use.

[0051] The photovoltaic module 3 in this utility model can be a photovoltaic panel structure or a photovoltaic module structure formed by multiple photovoltaic panels.

[0052] Both the negative external terminal 101 and the positive external terminal 102 in this utility model are equipped with MC4 terminals, which facilitates the wiring operation of the negative external terminal 101 and the positive external terminal 102.

[0053] The shutdown module 110 in this utility model can be a commonly used circuit element for controlling the switching on and off of control circuits, such as a relay, thyristor, or power transistor.

[0054] This utility model proposes a circuit breaker for photovoltaic modules. Its working principle is as follows: the negative external terminal 101 on the circuit breaker body 1 is connected to the negative terminal of the junction box 2 corresponding to one or a group of photovoltaic modules 3, and the positive external terminal 102 on the circuit breaker body 1 is connected to the positive terminal of the junction box 2 corresponding to one or a group of photovoltaic modules 3. When a circuit fault occurs in the photovoltaic module or an emergency occurs, the circuit breaker body 1 cuts off the path between two or two groups of photovoltaic modules 3, preventing current from flowing between the two or two groups of photovoltaic modules, thereby improving the shutdown effect and ensuring safety.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A switch for photovoltaic modules, characterized in that, The device includes a switch body (1), which has a negative external terminal (101) and a positive external terminal (102) connected to it. The negative external terminal (101) and the positive external terminal (102) are electrically connected to two or two sets of junction boxes (2), respectively. The two junction boxes (2) are electrically connected to two adjacent photovoltaic modules, and the two sets of junction boxes (2) are electrically connected to two adjacent sets of photovoltaic modules. The switch body (1) is used to cut off the path between two or two adjacent sets of photovoltaic modules.

2. The switch for photovoltaic modules according to claim 1, characterized in that, The switch body (1) includes a lower housing (103), and the negative external terminal (101) and the positive external terminal (102) are located on opposite sides of the lower housing (103).

3. The switch for photovoltaic modules according to claim 2, characterized in that, The switch body (1) also includes a negative electrode connecting piece (104), a positive electrode connecting piece (105), a negative electrode lead (108), a positive electrode lead (109), and a switch module (110) disposed in the inner cavity of the switch body (1); One end of the negative electrode external terminal (101) extends to the outside of the switch body (1), and the other end is located in the inner cavity of the switch body (1) and is electrically connected to the negative electrode connecting piece (104). The negative electrode connecting piece (104), the negative electrode lead (108) and the switch module (110) are electrically connected sequentially from front to back. One end of the positive electrode external terminal (102) extends to the outside of the switch body (1), and the other end is located in the inner cavity of the switch body (1) and is electrically connected to the positive electrode connecting piece (105). The positive electrode connecting piece (105), the positive electrode lead (109) and the switch module (110) are electrically connected sequentially from front to back.

4. The switch for photovoltaic modules according to claim 3, characterized in that, The switch body (1) further includes a negative transition connector (106) and a positive transition connector (107). The positive transition connector (107) is used to electrically connect the positive connecting piece (105) and the positive lead (109). The negative transition connector (106) is used to electrically connect the negative connecting piece (104) and the negative lead (108).

5. The switch for photovoltaic modules according to claim 3, characterized in that, A sealant filling cavity (111) is provided in the inner cavity of the switch body (1). The sealant filling cavity (111) refers to the unoccupied idle space in the inner cavity of the switch body (1). The volume of the idle space is not less than 80% of the volume of the inner cavity of the switch body (1).

6. The switch for photovoltaic modules according to claim 3, characterized in that, The lower housing (103) is provided with a snap-fit ​​platform for snapping the shut-off module (110).

7. The switch for photovoltaic modules according to claim 6, characterized in that, The lower housing (103) is provided with a limiting plate (1032), a limiting post (1034) and a locking platform. The locking platform is formed by the lower housing (103), the limiting plate (1032), the limiting post (1034) and the locking platform.

8. The switch for photovoltaic modules according to claim 6 or 7, characterized in that, The switch for photovoltaic modules also includes an upper cover (113), which is located at the top opening of the lower housing (103) and is engaged with the lower housing (103). The upper cover (113) and the lower housing (103) together enclose the inner cavity of the switch body (1).

9. The switch for photovoltaic modules according to claim 8, characterized in that, The lower housing (103) has two opposing inner sidewalls provided with upper cover limiting surfaces (115), which are inclined surfaces that face the lower housing (103).

10. The switch for a photovoltaic module according to claim 8, characterized in that, The outer wall of the upper cover (113) and / or the lower shell (103) is provided with a cable tie slot (116), the cable tie slot (116) is used to accommodate a cable tie, and the cable tie is used to fasten the upper cover (113) and the lower shell (103).

Images