High-protection low-voltage switch cabinet

Abstract

The utility model discloses a high-protection low-voltage switch cabinet, which comprises a cabinet body, a cabinet door, a circuit breaker, an inlet wire busbar and an outlet wire busbar, a mounting space is formed in the cabinet body, and an opening communicated with the mounting space is formed in the surface of the cabinet body; the wire inlet busbar and the wire outlet busbar are arranged in the cabinet body, and the wire inlet busbar and the wire outlet busbar are respectively connected with a wire inlet terminal and a wire outlet terminal of the circuit breaker; the circuit breaker comprises a base, an upper cover, a top cover, a circuit board, a release, a main loop conductor and an operating mechanism. The main loop conductor is arranged in a cavity formed by the base and the upper cover, and the operating mechanism is used for controlling connection and disconnection of the main loop conductor; the upper cover is provided with a release installation bin, the release installation bin extends towards the direction where the base is located, and an installation opening of the release installation bin is located in the upper cover. The circuit board is arranged between the upper cover and the top cover, the release is located in the release mounting bin, and the upper cover and the top cover are fastened through screws; the method has the characteristic of convenience in maintenance of a user.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment, and in particular to a high-protection low-voltage switchgear. Background Art

[0002] Low-voltage switchgear is an electrical equipment. The external power line enters the switchgear through the main switch and then connects to the sub-switch. The existing main switch and sub-switch basically use molded case circuit breakers. With the continuous development of intelligence, the requirements for main switches and sub-switch are getting higher and higher. For example, it is necessary to use some molded case circuit breakers containing electronic circuit boards and releases (such as electronic molded case circuit breakers, leakage molded case circuit breakers, etc.). However, the electronic circuit boards and releases inside this type of molded case circuit breaker are easily damaged in a humid environment. my country is known as the world's factory, and low-voltage switchgear, high-voltage switchgear and other equipment are also exported to Southeast Asia, Africa, the Middle East and other regions. This type of low-voltage switchgear is often transported by sea, so a humid environment is difficult to avoid.

[0003] For example, CN219017551U discloses a molded case leakage circuit breaker housing, which includes a bottom shell, a middle cover, and a top cover. The circuit board is arranged between the middle cover and the top cover. Although the release is not disclosed, the release is actually arranged between the bottom shell and the middle cover. Although such a structure makes it relatively easy to replace the circuit board, it is very difficult to replace the release.

[0004] Therefore, how to make electronic circuit boards and releases easier to replace is a direction worthy of research. Summary of the invention

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a high-protection low-voltage switch cabinet that can facilitate the replacement of electronic circuit boards and releases.

[0006] The present application provides: a high-protection low-voltage switch cabinet, which includes a cabinet body, a cabinet door, a circuit breaker, an incoming busbar and an outgoing busbar; an installation space is arranged in the cabinet body, an opening connected to the installation space is arranged on the surface of the cabinet body, and the cabinet door is hinged to the cabinet body for closing the opening; the incoming busbar and the outgoing busbar are arranged inside the cabinet body, and the incoming busbar and the outgoing busbar are respectively connected to the incoming terminal and the outgoing terminal of the circuit breaker; the circuit breaker includes a base, an upper cover, a top cover, a circuit board, a release, a main circuit conductor and an operating mechanism; the main circuit conductor is arranged in a cavity formed by the base and the upper cover, and the operating mechanism is used to control the connection and disconnection of the main circuit conductor; a release installation compartment is arranged on the upper cover, the release installation compartment extends toward the direction where the base is located, and the installation opening of the release installation compartment is located on the upper cover; the circuit board is arranged between the upper cover and the top cover, the release is in the release installation compartment, and the upper cover and the top cover are screwed.

[0007] With the above structure, since the release installation compartment is set on the upper cover, when the top cover is opened, the circuit board and the release will be exposed, so it is very convenient for users to replace them. Even if the circuit breaker has been installed in the low-voltage switch cabinet, the top cover can be removed to replace the circuit board and the release. Therefore, even if the circuit board and the release are damaged due to sea transportation, such a design makes it very easy for users to replace the corresponding parts, thus achieving the effect of a high-protection low-voltage switch cabinet.

[0008] In some embodiments of the present application, the circuit board is fastened to a side of the top cover facing the upper cover, and the releaser is fixed on the circuit board.

[0009] Such a structure not only makes the installation of the circuit board and the release more stable, but also makes maintenance very convenient. The maintenance personnel only need to remove the top cover and turn the back of the top cover toward them, and the circuit board and the release will be in front of them, making maintenance easier.

[0010] In some embodiments of the present application, the circuit board and the top cover are fastened by bolts or fixed by clamping; and / or, the releaser and the circuit board are fixed by clamping and welding.

[0011] This method will facilitate the assembly of circuit boards and releases.

[0012] In some embodiments of the present application, a power sampling line is provided on the back of the base, a first wiring channel is opened on the base, a second wiring channel is opened on the upper cover, the first wiring channel is connected to the second wiring channel, and the first end of the power sampling line extends from the first wiring channel and the second wiring channel to between the upper cover and the top cover; the first end of the power sampling line is electrically connected to the circuit board, and the second end of the power sampling line is electrically connected to the main circuit conductor.

[0013] This design makes it easier to get power from the circuit board.

[0014] In some embodiments of the present application, the main circuit conductor includes a first terminal row, a transition conductor, a first flexible connection, a moving contact, a static contact and a second terminal row; the first terminal row is electrically connected to one end of the transition conductor, the first flexible connection is welded between the other end of the transition conductor and the moving contact, and the static contact is electrically connected to the second terminal row; the operating mechanism is used to control the movement of the moving contact to achieve the connection and disconnection of the main circuit conductor; the second end of the power sampling line is electrically connected to the transition conductor through a screw.

[0015] With this design, it is more convenient to sample the power supply of the circuit board.

[0016] In some embodiments of the present application, a first plug-in is connected to the first end of the power sampling line, and a second plug-in is provided on the circuit board. The first plug-in and the second plug-in are plugged together to achieve electrical connection between the first end of the power sampling line and the circuit board.

[0017] This structure can facilitate wiring and make it easier to replace the circuit board.

[0018] In some embodiments of the present application, the releaser is a flux releaser, which includes a reset rod; an avoidance hole is opened on one side wall of the releaser mounting compartment, a lever portion of the operating mechanism is exposed in the avoidance hole, a portion of the reset rod extends from the avoidance hole to the vicinity of the lever, and the reset rod is located within the trajectory of the lever moving in the closing direction; during the closing process, the lever drives the reset rod to move to reset the flux release.

[0019] The use of this structure will facilitate the coordination between the flux release and the operating mechanism, and will be beneficial to the assembly of the release.

[0020] In some embodiments of the present application, the main circuit conductor includes a static contact, a moving contact and a contact support; the operating mechanism also includes a frame, a handle, a lever, a connecting rod structure, a jumper, a main tension spring, a lock, a re-lock and a traction rod; the frame is fixed to the base, the lever is rotatably set on the frame, the handle is connected to the lever, the jumper is rotatably set on the frame, one end of the connecting rod structure is rotatably set with the jumper, the other end of the connecting rod structure is connected to the contact support, and the main tension spring is connected between the middle part of the connecting rod structure and the lever; the lock Both the buckle and the re-buckle are rotatably connected to the frame, the re-buckle is located next to the lock buckle, and the trip buckle has an overlapping portion with the lock buckle; in the process of the operating mechanism rotating from opening to closing, the trip buckle overlaps the lock buckle, and the re-buckle and the lock buckle are offset, so that the trip buckle, the lock buckle and the re-buckle form a stable state to keep the structure in the closed state; the re-buckle and the traction rod move synchronously, and part of the traction rod is located within the actuating trajectory of the release, which drives the traction rod to move when the release is working, so that the stable states of the trip buckle, the lock buckle and the re-buckle are released.

[0021] By adopting this structure, a relatively stable operating effect can be achieved.

[0022] In some embodiments of the present application, a test device is also included, which includes a test button, a spring, and a test protrusion arranged on the traction rod. The upper part of the test button is exposed on the upper surface of the top cover, and the lower part of the test button is located on the test protrusion. The test button is slidingly arranged, and as the test button slides and contacts the test protrusion, the traction rod rotates, and the spring is used to reset the test button after sliding.

[0023] The setting of the test device will enable the user to force the circuit breaker to open through the test device.

[0024] In some embodiments of the present application, the number of main loop conductors is four, namely, A-phase main loop conductor, B-phase main loop conductor, C-phase main loop conductor, and N-phase main loop conductor; a zero-sequence transformer is also included, and the A-phase main loop conductor, the B-phase main loop conductor, the C-phase main loop conductor, and the N-phase main loop conductor pass through the zero-sequence transformer together; the output end of the zero-sequence transformer is electrically connected to the circuit board.

[0025] With this structural design, leakage current can be detected through a zero-sequence transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a low-voltage switchgear according to an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram showing the structure of a circuit breaker in a low-voltage switch cabinet according to an embodiment of the present application is shown;

[0029] Figure 3 A schematic diagram of the structure of a circuit breaker without a top cover in a low-voltage switch cabinet according to an embodiment of the present application is shown;

[0030] Figure 4 It shows a schematic diagram of the structure of the circuit breaker in the low-voltage switch cabinet of the embodiment of the present application without the top cover and the circuit board;

[0031] Figure 5 A schematic diagram showing the cooperation between the top cover, the circuit board and the release in the circuit breaker in the embodiment of the present application is shown;

[0032] Figure 6 A schematic diagram showing the cooperation between the circuit board and the release in the circuit breaker in the embodiment of the present application is shown;

[0033] Figure 7 A rear view of a circuit breaker base in a low-voltage switch cabinet according to an embodiment of the present application is shown;

[0034] Figure 8 A schematic diagram showing the structure of the main circuit conductor of the circuit breaker in the low-voltage switch cabinet according to the embodiment of the present application is shown;

[0035] Fig. 9 A schematic diagram showing the structure of a circuit breaker operating mechanism and a test device in a low-voltage switch cabinet according to an embodiment of the present application is shown;

[0036] Fig.10A cross-sectional view of a circuit breaker operating mechanism in a low-voltage switch cabinet according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0042] like Figure 1-Figure 10 As shown, an embodiment of the present application is a high-protection low-voltage switch cabinet, which includes a cabinet body 100 and a cabinet door 101.

[0043] The cabinet body 100 is roughly a hexahedron, and a plurality of installation spaces are arranged in the cabinet body 100 . Each installation space has an opening on the front surface, and the cabinet door 101 is hinged to the cabinet body 100 to realize opening and closing of the opening.

[0044] Many components such as circuit breakers 1, contactors, and power meters are arranged in the installation space.

[0045] Taking the circuit breaker 1 as an example, the cabinet 100 is provided with an incoming busbar 102 and an outgoing busbar 103. Here, because the circuit breaker is a 4-pole circuit breaker, the number of the incoming busbar 102 and the number of the outgoing busbar 103 are both four, which are respectively connected to the incoming terminal and the outgoing terminal of the circuit breaker, so that the circuit breaker is connected to the circuit to play a protective effect. Of course, although a 4-pole circuit breaker is used as an example here, a 3-pole circuit breaker or a 2-pole circuit breaker can also be used, as long as the number of the corresponding incoming busbar 102 and the outgoing busbar 103 remains the same.

[0046] The above-mentioned circuit breaker includes a housing, an operating mechanism, a main circuit conductor, a circuit board 500, a trip unit and a test device.

[0047] The housing is divided into a base 201, an upper cover 202, and a top cover 203 from bottom to top. The base 201 and the upper cover 202 are fastened by screws, and the upper cover 202 and the top cover 203 are fastened by screws.

[0048] The operating mechanism includes a frame 301, a handle 302, a lever 303, a connecting rod structure, a jumper 304, a main tension spring, a lock 306, a re-lock 307 and a traction rod 308. Here, the connecting rod structure includes a first connecting rod 309 and a second connecting rod, and the first connecting rod 309 and the second connecting rod are in an articulated relationship, and the middle part of the connecting rod structure is the hinge position of the two. The frame 301 is fixed to the base 201, the lever 303 is rotatably arranged on the frame 301, the handle 302 is connected to the lever 303, the jumper 304 is rotatably arranged on the frame 301, one end of the first connecting rod 309 is connected to the jumper 304, the main tension spring is connected to the hinge of the first connecting rod 309 and the second connecting rod, and one end of the second connecting rod is connected to the contact support. The lock catch 306 and the re-catch 307 are both rotatably connected to the frame 301, the re-catch 307 is located next to the lock catch 306, and the trip catch 304 has an overlapping portion with the lock catch 306; in the process of the operating mechanism rotating from opening to closing, the trip catch 304 overlaps with the lock catch 306, and the re-catch 307 resists against the lock catch 306, so that the trip catch 304, the lock catch 306, and the re-catch 307 form a stable state to keep the structure in the closed state. Here, the re-lock 307 and the traction rod 308 move synchronously (the same rotation center, and the re-lock 307 is clamped on the traction rod 308), and a release part is provided on the traction rod 308, which corresponds to the release, that is, the release part is located within the actuation trajectory of the release, so that when the release is working (when leakage occurs), the traction rod 308 can be driven to move, so that the stable state of the tripping buckle 304, the lock buckle 306 and the re-lock 307 is released.

[0049] The test device includes a test button 601, a spring 602 and a test protrusion 308b. The upper part of the test button 601 passes through the upper cover 202 and the top cover 203 in sequence and is exposed on the upper surface of the top cover 203. The test protrusion 308b is arranged on the traction rod 308 and corresponds to the lower part of the test button 601. Through the sliding setting of the test button 601, when the test button 601 is pressed and slides, the lower part of the test button 601 contacts the test protrusion 308b to rotate the traction rod 308, so that the stable state of the trip buckle 304, the lock buckle 306 and the re-buckle 307 is released. The spring 602 is sleeved on the test button 601 and is used for resetting after the test button 601 is pressed.

[0050] There are four main circuit conductors, namely, A-phase main circuit conductor, B-phase main circuit conductor, C-phase main circuit conductor, and N-phase main circuit conductor. Since the structures of the four-phase main circuit conductors are similar, one group of main circuit conductors is used as an example. The structures of other main circuit conductors can refer to this group of main circuit conductors. The main circuit conductor includes a contact support, a first terminal row 402 (a part of the incoming terminal), a transition conductor 403, a first flexible connection 404, a moving contact 405, a static contact 406, and a second terminal row 407 (a part of the outgoing terminal). Here, the first terminal row 402 is electrically connected (welded) to one end of the transition conductor 403, and the first flexible connection 404 is welded between the other end of the transition conductor 403 and the moving contact 405. The moving contact 405 is arranged on the contact support. The static contact 406 is electrically connected to the second terminal row 407, and is an integral part here. When the operating mechanism moves, the second connecting rod pulls the contact support to move, so that the moving contact 405 and the static contact 406 are connected and disconnected.

[0051] A release installation chamber 2021 is provided on the upper cover 202, and the release installation chamber 2021 as a whole extends toward the direction of the base 201 (it can also be said to sink toward the direction of the base 201), and the installation opening of the release installation chamber 2021 is opened on the upper cover 202, that is, toward the direction of the top cover 203. Here, the release is arranged in the release installation chamber 2021, and the circuit board 500 is arranged between the upper cover 202 and the top cover 203, and the upper cover 202 and the top cover 203 are fastened by screws, so the installation and removal of the circuit board 500 and the release are very convenient.

[0052] Here, the circuit board 500 is fixed on the top cover 203, and it is the side of the top cover 203 facing the upper cover 202. Specifically, the fastening method here is bolt fastening, that is, when the top cover 203 is removed, the circuit board 500 will also be removed. Of course, the bolt fastening here can also be replaced by clamping fixation. Here, the releaser is fixed on the circuit board 500, that is, when the top cover 203 is removed, the releaser and the circuit board 500 will be taken down together. The releaser and the circuit board 500 here adopt a combination of clamping fixation and welding fixation. The clamping fixation refers to the provision of a barb 701 on the releaser, which is hooked on the circuit board 500. Welding fixation means that the conductive part of the releaser is welded to the circuit board 500, so that the circuit board 500 and the releaser are electrically connected, so that the circuit board 500 can drive the releaser to work.

[0053] In order to facilitate the power supply of the circuit board 500, a power sampling line 800 is provided on the back of the base 201, a first wiring channel 2011 is provided on the base 201, and a second wiring channel is provided on the upper cover 202. The second end of the power sampling line 800 can draw power from the main circuit, and the first end of the power sampling line 800 passes through the first wiring channel 2011 and the second wiring channel in sequence and extends between the upper cover 202 and the top cover 203 to connect with the circuit board 500. Here, the first end of the power sampling line 800 is electrically connected to the circuit board 500 in the form of a connector. Specifically, a first plug-in 801 is connected to the first end of the power sampling line 800, and a second plug-in is provided on the circuit board 500, and the two are plug-in matched. Here, the second end of the power sampling line 800 is connected to the transition conductor 403 by a screw to achieve power collection.

[0054] The above-mentioned release is a magnetic flux release, which includes a reset rod 702 and a release body 703. After the release body 703 is actuated, it can be reset by the reset rod 702. The reset rod 702 here cooperates with the lever 303 of the operating mechanism. Specifically, a avoidance through hole 2023 is opened on one side wall of the release installation compartment 2021, and the lever 303 of the operating mechanism is partially exposed in the avoidance through hole 2023. A part of the reset rod 702 extends from the avoidance through hole 2023 to the vicinity of the lever 303, and the reset rod 702 is located in the trajectory of the lever 303 moving in the closing direction. In this way, whenever the release works, the lever 303 will drive the reset rod 702 to move during the closing process to reset the magnetic flux release.

[0055] The zero-sequence transformer is passed through by the four-phase main circuit conductors, and the output end of the zero-sequence transformer is electrically connected to the circuit board 500 (for example, an electrical connection realized by a flexible wire). In this way, the sampled current information can be fed back to the circuit board 500. When the sampled current parameter meets the threshold value set in the circuit board 500, it can be determined that leakage has occurred, and the circuit board 500 will drive the release to work, so that the operating mechanism is opened.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A high protection low voltage switch cabinet, Features: The utility model comprises a cabinet, a cabinet door, a circuit breaker, an incoming busbar and an outgoing busbar; an installation space is arranged in the cabinet, an opening communicating with the installation space is arranged on the surface of the cabinet, and the cabinet door is hinged with the cabinet to close the opening; the incoming busbar and the outgoing busbar are arranged inside the cabinet, and the incoming busbar and the outgoing busbar are respectively connected with the incoming terminal and the outgoing terminal of the circuit breaker; the circuit breaker comprises a base, an upper cover, a top cover, a circuit board, a release, a main circuit conductor and an operating mechanism; the main circuit conductor is arranged in a cavity formed by the base and the upper cover, and the operating mechanism is used to control the connection and disconnection of the main circuit conductor; a release installation compartment is arranged on the upper cover, the release installation compartment extends toward the direction where the base is located, and the installation opening of the release installation compartment is located on the upper cover; the circuit board is arranged between the upper cover and the top cover, the release is in the release installation compartment, and the upper cover and the top cover are fastened with screws.

2. A high protection low voltage switch cabinet according to claim 1, Features: The circuit board is fastened to a side of the top cover facing the upper cover, and the releaser is fixed on the circuit board.

3. A high protection low voltage switch cabinet according to claim 2, Features: The circuit board and the top cover are fastened by bolts or fixed by clamping; and / or the releaser and the circuit board are fixed by clamping and welding.

4. A high protection low voltage switch cabinet according to claim 1, Features: A power sampling line is arranged on the back of the base, a first wiring channel is opened on the base, a second wiring channel is opened on the upper cover, the first wiring channel is connected with the second wiring channel, and the first end of the power sampling line extends from the first wiring channel and the second wiring channel to between the upper cover and the top cover; the first end of the power sampling line is electrically connected to the circuit board, and the second end of the power sampling line is electrically connected to the main circuit conductor.

5. A high protection low voltage switch cabinet according to claim 4, Features: The main circuit conductor includes a first terminal row, a transition conductor, a first flexible connection, a moving contact, a static contact and a second terminal row; the first terminal row is electrically connected to one end of the transition conductor, the first flexible connection is welded between the other end of the transition conductor and the moving contact, and the static contact is electrically connected to the second terminal row; the operating mechanism is used to control the movement of the moving contact to achieve the connection and disconnection of the main circuit conductor; the second end of the power sampling line is electrically connected to the transition conductor through a screw.

6. A high protection low voltage switch cabinet according to claim 4, Features: A first plug-in is connected to the first end of the power sampling line, and a second plug-in is arranged on the circuit board. The first plug-in and the second plug-in are plugged together to realize the electrical connection between the first end of the power sampling line and the circuit board.

7. A high protection low voltage switch cabinet according to claim 1, Features: The releaser is a magnetic flux releaser, which includes a reset rod; an avoidance through hole is opened on one side wall of the releaser installation compartment, a part of the lever of the operating mechanism is exposed in the avoidance through hole, a part of the reset rod extends from the avoidance through hole to the vicinity of the lever, and the reset rod is located in the trajectory of the lever moving toward the closing direction; during the closing process, the lever drives the reset rod to move so that the magnetic flux releaser is reset.

8. A high protection low voltage switch cabinet according to claim 1, Features: The main circuit conductor includes a static contact, a moving contact and a contact support; the operating mechanism also includes a frame, a handle, a lever, a connecting rod structure, a tripping buckle, a main tension spring, a lock buckle, a re-locking buckle and a traction rod; the frame is fixed to the base, the lever is rotatably arranged on the frame, the handle is connected to the lever, the tripping buckle is rotatably arranged on the frame, one end of the connecting rod structure is rotatably arranged with the tripping buckle, the other end of the connecting rod structure is connected to the contact support, and the main tension spring is connected between the middle part of the connecting rod structure and the lever; the lock buckle and the re-locking buckle are both rotatably connected to the frame, the re-locking buckle is located next to the lock buckle, and the tripping buckle has an overlapping portion with the lock buckle; in the process of the operating mechanism rotating from opening to closing, the tripping buckle overlaps with the lock buckle, and the re-locking buckle is offset against the lock buckle, so that the tripping buckle, the lock buckle and the re-locking buckle form a stable state so that the structure remains in the closed state; the re-locking buckle and the traction rod move synchronously, and part of the traction rod is located within the actuation trajectory of the release, and the traction rod is driven to move when the release is working, so that the stable states of the tripping buckle, the lock buckle and the re-locking buckle are released.

9. A high protection low voltage switch cabinet according to claim 8, Features: It also includes a test device, which includes a test button, a spring, and a test protrusion arranged on the traction rod. The upper part of the test button is exposed on the upper surface of the top cover, and the lower part of the test button is located on the test protrusion. The test button is slidingly arranged, and as the test button slides and contacts the test protrusion, the traction rod rotates. The spring is used to reset the test button after sliding.

10. A high protection low voltage switch cabinet according to claim 1, Features: There are four main circuit conductors, namely, A-phase main circuit conductor, B-phase main circuit conductor, C-phase main circuit conductor, and N-phase main circuit conductor; it also includes a zero-sequence transformer, through which the A-phase main circuit conductor, the B-phase main circuit conductor, the C-phase main circuit conductor, and the N-phase main circuit conductor pass together; the output end of the zero-sequence transformer is electrically connected to the circuit board.

Images