A molded case circuit breaker

Abstract

The present application discloses a molded case circuit breaker, which comprises a base, a circuit board support, a transformer and at least two-pole main circuit conductors, wherein the base is provided with a pole space corresponding to the number of main circuit conductors; the pole space is divided into a first terminal area, a contact arc extinguishing area, a transformer installation area and a second terminal area in sequence along the length direction of the base; the first terminal areas of each pole space and the contact arc extinguishing areas of each pole space are separated by a first phase spacing rib, and the second terminal areas of each pole space are separated by a second phase spacing rib; wherein the transformer installation areas of each pole space are interconnected; the transformer is located in the transformer installation area and is arranged next to the second terminal area, so that there is a spare area between the transformer and the contact arc extinguishing area in the transformer installation area; the circuit board support comprises a first part and a second part, the first part is located above the transformer, the second part fills the spare area, and the first part and the second part jointly form a first accommodation space; the second part is provided with a partition groove corresponding to each pole main circuit conductor one by one, and the partition groove is not connected to the first accommodation space; the present application can make full use of the space of the base to arrange the circuit board support.

Description

Technical Field

[0001] The present application relates to the field of low-voltage switchgear, and in particular to a molded case circuit breaker. Background Art

[0002] For example, electronic molded case circuit breakers, measuring switches, fusion switches, reclosing circuit breakers and other types of molded case circuit breakers often require the use of circuit boards to complete some functions.

[0003] These circuit breakers are often equipped with mutual inductors for sampling, and the signals are fed back to the circuit board to complete the corresponding functions. The functions here can be different for each specific type of circuit breaker. For example, for electronic molded case circuit breakers, the sampled signals can be used for short circuit, overload and other protection. For measuring switches, fusion switches and other types of circuit breakers, the sampled signals can be used for short circuit, overload and other protection or metering functions.

[0004] In order to ensure the stable placement of the circuit board, the existing circuit breakers using the circuit board will be provided with a bracket just above the transformer, and the circuit board will be placed in the bracket. If the functions to be implemented are more complex, more circuit boards need to be provided, which will occupy part of the space on the upper part of the middle cover to place the circuit board.

[0005] In fact, for this type of circuit breaker, the space near the transformer in the base is basically wasted. One of the reasons for the waste is that in order to ensure that there is no short circuit between the poles, the base often uses phase partitions to separate the poles, which also leads to a relatively small space, making the design of the circuit board installation bracket inconvenient and impractical.

[0006] For example, an intelligent circuit breaker disclosed in CN216597450U only has a circuit board bracket above the transformer, and the space inside the base is not used, which easily causes a waste of the internal space of the product.

[0007] Therefore, how to design a circuit board placement structure that makes the best use of the internal space of the base is very necessary for this type of circuit breaker containing a circuit board, especially for circuit breakers such as fusion switches and measuring switches that have been promoted in recent years. Full utilization of the internal space of the base will be very beneficial for reducing the height size of the circuit breaker. Summary of the invention

[0008] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a molded case circuit breaker.

[0009] The present application provides: a molded case circuit breaker, which includes a base, a circuit board support, a transformer and at least two-pole main circuit conductors, wherein the base is provided with a pole space corresponding to the number of main circuit conductors; the pole space is divided into a first terminal area, a contact arc extinguishing area, a transformer installation area and a second terminal area in sequence along the length direction of the base; the first terminal areas of each pole space and the contact arc extinguishing areas of each pole space are separated by a first phase spacing rib, and the second terminal areas of each pole space are separated by a second phase spacing rib; wherein the transformer installation areas of each pole space are interconnected; the transformer is located in the transformer installation area and is arranged next to the second terminal area, so that there is a spare area between the transformer and the contact arc extinguishing area in the transformer installation area; the circuit board support includes a first part and a second part, the first part is located above the transformer, the second part fills the spare area, and the first part and the second part together form a first accommodating space; the second part is provided with a partition groove corresponding to each pole main circuit conductor one by one, and the partition groove is not connected to the first accommodating space.

[0010] With this structure, all the transformer installation areas are connected together, and the transformer is set next to the second terminal area, so that there is a vacant area in the transformer installation area, and the circuit board bracket has a second part that fills the vacant area. Compared with the circuit board bracket in the prior art, it is equivalent to having an additional second part of the vacant area, which can increase the volume of the first accommodation space and accommodate more circuit boards or electronic components or corresponding wiring harnesses, which can effectively reduce the height of the product (the prior art can only increase the corresponding space on the middle cover, which will inevitably increase the height of the middle cover). At the same time, a partition groove is provided on the second part, which is not connected to the first accommodation space, which can ensure the insulation performance between the main circuit conductor and the first accommodation space, and can also separate the main circuit conductors of each pole through the second part to avoid short circuit between poles.

[0011] In some embodiments of the present application, the circuit board bracket includes a bottom wall and a peripheral side wall, and the peripheral side wall forms the first accommodating space around the periphery of the bottom wall; the bottom wall includes a first bottom wall, a second bottom wall and a side bottom wall, the first bottom wall is higher than the second bottom wall, and the first bottom wall and the second bottom wall are connected through the side bottom wall; the peripheral side wall and the first bottom wall form the first part, and the peripheral side wall and the second bottom wall and the side bottom wall form the second part; the partition groove is arranged on the second bottom wall.

[0012] With this structure, the circuit board bracket is divided into a bottom wall and a peripheral side wall, and the bottom wall is divided into a first bottom wall, a second bottom wall and a side bottom wall, which will fit better with the mutual inductor, the base, etc., and it is easier to form the first part and the second part.

[0013] In some embodiments of the present application, a middle cover is further included, on which a second accommodating space is provided and a connecting hole is opened; the middle cover is located above the base, and the second accommodating space is connected to the first accommodating space through the connecting hole.

[0014] With this structure, a second accommodating space can be set on the middle cover, and the second accommodating space is connected to the first accommodating space, so that there is a very large space to set the circuit board assembly, which can meet more electronic function design requirements.

[0015] In some embodiments of the present application, the upper end of the peripheral side wall extends beyond the base to form a lip structure, the middle cover is located below the connecting hole and has a through groove, the lip structure is inserted into the through groove, the lip structure is adjacent to the groove wall of the through groove and is staggered, and the connecting hole and the through groove are connected to the first accommodating space.

[0016] By adopting this structure, the lip structure of the peripheral side wall extending beyond the base and the groove wall of the through groove are staggered, which will greatly improve the insulation performance and ensure the stability of the circuit board.

[0017] In some embodiments of the present application, a partition wall is arranged between the contact arc extinguishing area and the transformer installation area of ​​each pole space, and a first opening for the main circuit conductor to pass through is opened on the partition wall; the peripheral side wall includes a first peripheral side wall, which separates the first opening from the first accommodating space, and the first peripheral side wall forms a guide protrusion, and the guide protrusion is partially embedded in the first opening to form a guide structure when the circuit board bracket is installed.

[0018] With this structure, the design of the first opening will facilitate the insertion of the main circuit conductor, and the design of the guide protrusion will facilitate the installation of the circuit board bracket.

[0019] In some embodiments of the present application, a partition wall is arranged between the contact arc extinguishing area and the transformer installation area of ​​each pole space, and a first opening for the main circuit conductor to pass through is opened on the partition wall; a first slot is opened on the first opening, and a first baffle is inserted in the first slot; the first baffle is located above the main circuit conductor, and closes the first opening except for the main circuit conductor.

[0020] With this structure, the first baffle can be used to further separate the first accommodating space from the contact arc extinguishing area.

[0021] In some embodiments of the present application, the base is provided with a first wiring channel located in the transformer installation area, and the first wiring channel is connected to the back of the base; a second wiring channel is provided on the second bottom wall, and the second wiring channel corresponds to and is connected to the first wiring channel, so that the back of the base is connected to the first accommodating space.

[0022] With this structure, the back side of the base can be connected to the first accommodation space, so that some sampling lines on the back side of the base can enter the first accommodation space.

[0023] In some embodiments of the present application, a partition wall is arranged between the contact arc extinguishing area and the transformer installation area of ​​each pole space, and a first opening for the main circuit conductor to pass through is opened on the partition wall; the peripheral side wall includes a first peripheral side wall, and the first peripheral side wall separates the first opening from the first accommodating space; the second bottom wall includes alternating raised parts and recessed parts, and the number of raised parts corresponds to the number of main circuit conductors; the partition groove is located in the raised part, and the partition groove has an overlapping part with the first opening for the main circuit conductor to pass through.

[0024] Adopting this structure and using a second bottom wall with convex parts and concave parts alternately arranged will be beneficial to the design of the partition groove and will help to increase the creepage distance between poles.

[0025] In some embodiments of the present application, the main loop conductor includes a second terminal board located in the second terminal area; the peripheral side wall includes a second peripheral side wall, and the second peripheral side wall separates the first accommodating space from the second terminal area; a wiring groove is opened on the second peripheral side wall, and a sampling point is provided on the second terminal board, and the wiring groove is located above the sampling point.

[0026] With this structural design, the second peripheral side wall separates the first accommodation space from the second terminal area. The word "separation" here does not mean complete separation, because there is also a wiring trough design. While satisfying the wiring trough design (the purpose of the wiring trough design is to facilitate the sampling line on the second terminal board to enter the first accommodation space), the insulation performance is improved as much as possible.

[0027] In some embodiments of the present application, one of the pole spaces is a first pole space, and the length dimension of the contact arc extinguishing area of ​​the first pole space is greater than the length dimension of the contact arc extinguishing area of ​​the remaining pole spaces, so that the length dimension of the transformer installation area located at the first pole space is less than the length dimension of the transformer installation area located at the remaining pole spaces;

[0028] With this structure, the reason why the length dimension of the contact arc extinguishing area of ​​the first pole space is designed to be larger than that of other pole spaces is because a releaser will be set in the contact arc extinguishing area of ​​the first pole space. Such a space design will make the overall internal structure more compact, which is conducive to the setting of the releaser.

[0029] In some embodiments of the present application, the circuit board bracket and the base are fixed by a fastening structure, and the fastening structure is one or more of fastening with fasteners, clamping fixation, and interference fit.

[0030] This structure is helpful for fixing the circuit board bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A stereoscopic diagram of a molded case circuit breaker according to Embodiment 1 of the present application is shown;

[0033] Figure 2 A schematic diagram of the molded case circuit breaker after removing the upper cover in Embodiment 1 of the present application is shown;

[0034] Figure 3 A schematic diagram of the molded case circuit breaker of Embodiment 1 of the present application after removing the upper cover and the circuit board is shown;

[0035] Figure 4 A schematic diagram of an upper cover in a molded case circuit breaker in Example 1 of the present application is shown;

[0036] Figure 5 A schematic diagram of a base in a molded case circuit breaker in Example 1 of the present application is shown;

[0037] Figure 6 A schematic diagram showing the cooperation between the base and the mutual inductor in the molded case circuit breaker in Embodiment 1 of the present application is shown;

[0038] Figure 7 A cross-sectional view and a partial enlarged view of the lip structure and the through groove in the molded case circuit breaker of Example 1 of the present application are shown;

[0039] Figure 8 A schematic diagram showing the lip structure and the base in the molded case circuit breaker of Example 1 of the present application is shown;

[0040] Fig. 9 A schematic diagram of a main circuit conductor in a molded case circuit breaker in Example 1 of the present application is shown;

[0041] Fig.10 A schematic diagram and a partial enlarged diagram of the cooperation between the circuit board bracket and the base in the molded case circuit breaker of Example 1 of the present application are shown.

[0042] Fig.11 A schematic diagram showing a perspective of a circuit board bracket in a molded case circuit breaker in Example 1 of the present application is shown;

[0043] Fig.12 A schematic diagram showing another perspective of a circuit board bracket in a molded case circuit breaker in Embodiment 1 of the present application is shown;

[0044] Fig.13A schematic diagram showing a perspective of a circuit board bracket and a connecting conductor in a molded case circuit breaker in Embodiment 1 of the present application after being matched;

[0045] Fig.14 A schematic diagram showing another perspective of the circuit board bracket and the connecting conductor in the molded case circuit breaker of Example 1 of the present application after being matched. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] In addition, the terms "primary" and "secondary" 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, features defined as "primary" and "secondary" 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.

[0049] 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.

[0050] In the present application, unless otherwise clearly specified and limited, when a main feature is “above” or “below” a second feature, it can mean that the main feature and the second feature are in direct contact, or the main feature and the second feature are in indirect contact through an intermediate medium. Moreover, when a main feature is “above”, “above” or “above” a second feature, it can mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. When a main feature is “below”, “below” or “below” a second feature, it can mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0051] like Figure 1-Figure 14 As shown, an embodiment of the present application provides a molded case circuit breaker, which also contains a molded case circuit breaker with electronic functions, and this electronic function is realized through a circuit board. Of course, the electronic functions here are different depending on the type of specific circuit breaker. For example, in a leakage molded case circuit breaker, the electronic function is leakage protection; for another example, in molded case circuit breakers such as fusion switches and measuring switches, the electronic function is metering or overload protection or short circuit protection, etc.; for another example, in an electronic molded case circuit breaker, the electronic function is overload protection or short circuit protection, etc.; for another example, in a reclosing circuit breaker, the electronic function is electric operation control or overload protection or short circuit protection, etc.

[0052] The present application is introduced with a molded case circuit breaker belonging to a measuring switch. In addition, the relevant structure of the circuit board bracket 4000 of the present application can also be applied to other types of molded case circuit breakers.

[0053] The molded case circuit breaker includes a base 1000 , a middle cover 2000 , an upper cover 3000 , a circuit board bracket 4000 , a mutual inductor 5000 and a main circuit conductor 6000 .

[0054] The base 1000 , in the present application, includes three-pole spaces S1 , and the three-pole spaces S1 are arranged in sequence in the width direction of the base 1000 .

[0055] From the length direction of the base 1000, the pole space S1 is divided into the first terminal area S100, the contact arc extinguishing area S200, the transformer installation area S300, and the second terminal area S400. Here, the transformer installation areas S300 of each pole are interconnected. The first terminal areas S100 of each pole space S1 and the contact arc extinguishing areas S200 of each pole space S1 are separated by the first phase spacing rib 1001, and the second terminal areas S400 of each pole space S1 are separated by the second phase spacing rib S410.

[0056] The main circuit conductor 6000 is arranged in the pole space S1. The main circuit here is not a complete conductor. According to the different areas, the main circuit conductor 6000 includes a first terminal board 6001 and a static contact 6002 (the first terminal board 6001 and the static contact 6002 are integrated) arranged in the first terminal area S100 and the contact arc extinguishing area S200, a moving contact 6003 and a thermal element 6004 (one end of the thermal element 6004 and the moving contact 6003 are softly connected) arranged in the contact arc extinguishing area S200, a second terminal board 6005 arranged in the second terminal area S400, and a connecting conductor 6006 connecting the second terminal board 6005 and the other end of the thermal element 6004 (in this embodiment, a hard busbar structure in which the second terminal board 6005 and the connecting conductor 6006 are integrally formed is adopted. In addition, the connecting conductor 6006 can also be set to a soft connection). Here, the connecting conductor 6006 passes through the transformer installation area S300.

[0057] The number of transformers 5000 is adapted to the number of pole spaces S1, because the transformers 5000 have to correspond one to one with the connecting conductors 6006. The transformers 5000 here can be metering transformers 5000 or protection transformers 5000, or a combination of metering transformers 5000 and protection transformers 5000. Similarly, the transformer 5000 corresponding to each pole connecting conductor 6006 can be a separate transformer module, or a complete transformer module (containing multiple transformers 5000), or separate transformer modules spliced ​​together. Obviously, in this embodiment, separate transformer modules are spliced ​​together.

[0058] Here, the transformer 5000 is arranged in the transformer installation area S300, and is arranged next to the corresponding second terminal area S400. Therefore, there will be some spare areas S3001 in the transformer installation area S300, and this spare area S3001 is located between the transformer 5000 and the contact arc extinguishing area S200. In this embodiment, the length dimension of the contact arc extinguishing area S200 of the first pole space S11 is greater than the length dimension of the contact arc extinguishing area S200 of the second and third pole spaces S1, so the length dimensions of the various parts of the spare area S3001 in this embodiment are not all consistent, but the length of the spare area S3001 corresponding to the first pole space S11 will be shorter than the length of the spare area S3001 corresponding to the second and third pole spaces S1. Of course, it can also be said that the lengths of the various parts of the transformer installation area S300 are different, and the part corresponding to the first pole space S11 will be smaller than the part corresponding to the second and third pole spaces S1.

[0059] The circuit board support 4000 includes a bottom wall 4001 and a peripheral side wall 4002. The peripheral side wall 4002 surrounds the periphery of the bottom wall 4001 (it can be said that it surrounds the four sides) to form a first accommodating space 4003. The first accommodating space 4003 has an upper opening 4003a. Here, the bottom wall 4001 is relatively close to the mutual inductor 5000 and the base 1000, so the bottom wall 4001 includes a first bottom wall 4001a, a second bottom wall 4001b and a side bottom wall 4001c. Here, the first bottom wall 4001a is higher than the second bottom wall 4001b, and the first bottom wall 4001a is connected to the second bottom wall 4001b through the side bottom wall 4001c. Here, the first bottom wall 4001a is adjacent to the upper surface of the transformer 5000, the side bottom wall 4001c is adjacent to the surface of the transformer 5000 facing the contact arc extinguishing area S200, and the second bottom wall 4001b is adjacent to the bottom surface of the base 1000. Through such a design of the bottom wall 4001, the first accommodating space 4003 includes a first part 4003a and a second part 4003b. The first part 4003a is formed by the peripheral side wall 4002 and the first bottom wall 4001a, and is located above the transformer 5000. The second part 4003b is formed by the peripheral side wall 4002, the second bottom wall 4001b and the side bottom wall 4001c, and the second part 4003b can fill the empty area S3001.

[0060] Here, the connection conductors 6006 of the main circuit conductors 6000 of each pole are separated by the second portion 4003b, specifically, by the second bottom wall 4001b, because the second bottom wall 4001b is provided with partition grooves 4001b3 corresponding to each connection conductor 6006, and the creepage distance between poles can be ensured by the partition grooves 4001b3. As a more specific structure, the second bottom wall 4001b is not a flat bottom wall 4001, but is uneven, that is, it includes a raised portion 4001b1 (referred to here as the raised portion 4001b1 because, viewed from the direction of the upper opening 4003a of the first accommodating space 4003, the raised portion 4001b1 protrudes toward the upper opening 4003a) and a recessed portion 4001b2, the raised portion 4001b1 and the recessed portion 4001b2 are alternately arranged, and the partition groove 4001b3 is located in the raised portion 4001b1.

[0061] The peripheral side wall 4002 can be divided into a first peripheral side wall 4002a, a second peripheral side wall 4002b, a third peripheral side wall 4002c and a fourth peripheral side wall 4002d according to the different positions at which it is set. The first peripheral side wall 4002a, the second peripheral side wall 4002b, the third peripheral side wall 4002c and the fourth peripheral side wall 4002d here are surrounded to form a ring-shaped structure (of course, the ring-shaped structure here does not specifically refer to a circle). Here, the first peripheral side wall 4002a is adjacent to the contact arc extinguishing area S200, and the first peripheral side wall 4002a can completely separate the contact arc extinguishing area S200 from the first accommodating space 4003. Here, the first peripheral side wall 4002a is adjacent to the contact arc extinguishing area S200, and the first peripheral side wall 4002a can completely separate the contact arc extinguishing area S200 from the first accommodating space 4003. Here, the second peripheral side wall 4002b is disposed adjacent to the second terminal area S400, and the second peripheral side wall 4002b separates the first accommodation space 4003 from the second terminal area S400. The separation mentioned here does not mean complete separation, because the second peripheral side wall 4002b is also provided with a wiring groove 4002b1 (the wiring groove 4002b1 will be described in detail below). The third peripheral side wall 4002c and the fourth peripheral side wall 4002d are respectively attached to the two side walls of the base 1000.

[0062] Here, the upper end of the peripheral side wall 4002 is arranged beyond the upper surface of the base 1000, and the exceeding part forms a lip structure 4004. The lip structure 4004 here is to achieve a staggered arrangement with the middle cover 2000 to improve the insulation performance. Specifically, the middle cover 2000 is located above the base 1000, and the middle cover 2000 here can be directly fixed to the base 1000 by bolts, or the upper cover 3000, the middle cover 2000, and the base 1000 can be fixed by bolts. A second storage space 2001 is also provided in the middle cover 2000. A connecting hole 2002 and a through slot 2003 are also provided on the middle cover 2000, which are connected to the second storage space 2001. The connecting hole 2002 is located above the through slot 2003. The lip structure 4004 is inserted into the through slot 2003. The lip structure 4004 and the groove wall of the through slot 2003 are adjacent and staggered. After the second storage space 2001, the connecting hole 2002, the through slot 2003 and the first storage space 4003 are connected, the insulation performance can be greatly improved. Of course, in addition to this, the lip structure 4004 and the through slot 2003 can also be omitted. It is only necessary to make the connecting hole 2002 correspond to the upper opening 4003a, so that the first storage space 4003 can be connected to the second storage space 2001, but the insulation performance will be relatively weaker.

[0063] In order to facilitate the installation of the circuit board support 4000, a partition wall S250 is provided between the contact arc extinguishing area S200 of the pole space S1 and the transformer installation area S300. The partition wall S250 is provided with a first opening S251 for the main circuit conductor 6000 (connecting conductor 6006) to pass through (the first opening S251 here has an overlapping portion with the partition groove 4001b3 in the height direction of the base 1000, so as to facilitate the connection conductor 6006 to pass through). A guide protrusion 4002a1 is provided on the corresponding first peripheral side wall 4002a, and the guide protrusion 4002a1 is attached to the first opening S251, so that when the circuit board support 4000 is installed, this attachment can be used to form a guide structure, which will be beneficial to the installation and stability after installation. Here, the guide protrusion 4002a1 basically blocks all the parts of the first opening S251 except for the connection conductor 6006 to pass through, which can also improve the insulation performance. In addition, a first slot S252 is provided on the first opening S251, and a first baffle S253 is provided in the first slot S252. The first baffle S253 is located above the connecting conductor 6006, and completely blocks the first opening S251 except for the connecting conductor 6006. The setting of the first baffle S253 can improve the insulation performance, and also prevent the high-temperature gas from the contact arc extinguishing area S200 from damaging the circuit board bracket 4000.

[0064] The circuit board support 4000 and the base 1000 are fixed by a fastening structure. In this embodiment, a screw hole 1000a is provided between the circuit board support 4000 and the base 1000, and the circuit board support 4000 and the base 1000 are fixed by a fastener such as a screw. Of course, there are many options for the fastening structure, for example, fastening can also be performed by a snap connection, an interference fit, or a combination of several fastening methods.

[0065] This is to facilitate the sampling line on the circuit breaker to enter the first accommodating space 4003.

[0066] A second wiring channel 4001b4 is provided on the second bottom wall 4001b, that is, a second wiring channel 4001b4 is provided on the recessed portion 4001b2 of the second bottom wall 4001b, and a first wiring channel 1000b is provided at the position of the base 1000 corresponding to the second wiring channel 4001b4, and the first wiring channel 1000b is connected with the second wiring channel 4001b4, so that the back of the base 1000 is connected with the first accommodation space 4003, so that the sampling line from the back of the base 1000 can enter the first accommodation space 4003 through the first wiring channel 1000b and the second wiring channel 4001b4. Of course, the sampling line here can be used for sampling current signals, sampling voltage signals, or sampling temperature signals.

[0067] A sampling point 6005a is provided on the second terminal board 6005, and a corresponding wiring groove 4002b1 is provided on the second peripheral side wall 4002b, wherein the wiring groove 4002b1 is located above the sampling point 6005a, and the sampling line here can enter the first accommodation space 4003 through the wiring groove 4002b1. Similarly, the sampling line here can be used for sampling current signals, sampling voltage signals, or sampling temperature signals.

[0068] A second slot S411 is further provided on the second phase interval S410 , and a second baffle S412 is provided in the second slot S411 . The second baffle S412 separates the second terminal region S400 from the second peripheral side wall 4002 b , and can also improve insulation performance.

[0069] The above example is a three-pole circuit breaker. In addition to being used in three-pole circuit breakers, this structure is also applicable to four-pole and two-pole circuit breakers, and only adaptive changes need to be made.

[0070] 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.

[0071] 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 molded case circuit breaker, comprising a base, a circuit board bracket, a transformer and at least two-pole main circuit conductors, wherein the base is provided with pole spaces corresponding to the number of main circuit conductors; the pole spaces are sequentially divided into a first terminal area, a contact arc extinguishing area, a transformer installation area and a second terminal area along the length direction of the base; the first terminal areas of each pole space and the contact arc extinguishing areas of each pole space are separated by a first phase spacing rib, and the second terminal areas of each pole space are separated by a second phase spacing rib; characterized in that: The transformer installation areas of each pole space are interconnected; the transformer is located in the transformer installation area and is arranged next to the second terminal area, so that there is a spare area between the transformer and the contact arc extinguishing area in the transformer installation area; the circuit board bracket includes a first part and a second part, the first part is located above the transformer, the second part fills the spare area, and the first part and the second part together form a first accommodating space; the second part is provided with a partition groove corresponding to each pole main circuit conductor one by one, and the partition groove is not connected to the first accommodating space; the circuit board bracket includes a bottom wall and a peripheral side wall, and the peripheral side wall surrounds the periphery of the bottom wall to form the first accommodating space; The bottom wall comprises a first bottom wall, a second bottom wall and a side bottom wall, the first bottom wall is higher than the second bottom wall, and the first bottom wall and the second bottom wall are connected via the side bottom wall; The peripheral side wall and the first bottom wall form the first part, and the peripheral side wall, the second bottom wall and the side bottom wall form the second part; the partition groove is arranged on the second bottom wall.

2. A molded case circuit breaker according to claim 1, characterized in that: It also includes a middle cover, which is provided with a second accommodating space and a connecting hole; the middle cover is located above the base, and the second accommodating space is connected with the first accommodating space through the connecting hole.

3. A molded case circuit breaker according to claim 2, characterized in that: The upper end of the peripheral side wall exceeds the base to form a lip structure. The middle cover is located below the connecting hole and has a through groove. The lip structure is inserted into the through groove. The lip structure is adjacent to the groove wall of the through groove and is staggered. The connecting hole and the through groove are connected to the first accommodating space.

4. A molded case circuit breaker according to claim 1, characterized in that: A partition wall is provided between the contact arc extinguishing area of ​​each pole space and the transformer installation area, and a first opening for the main circuit conductor to pass through is provided on the partition wall; The peripheral side wall includes a first peripheral side wall, which separates the first opening from the first accommodating space. The first peripheral side wall forms a guide protrusion, and the guide protrusion is partially embedded in the first opening to form a guide structure when the circuit board bracket is installed.

5. The molded case circuit breaker according to claim 1, characterized in that: A partition wall is arranged between the contact arc extinguishing area and the transformer installation area of ​​each pole space, and a first opening for the main circuit conductor to pass through is opened on the partition wall; a first slot is opened on the first opening, and a first baffle is inserted in the first slot; the first baffle is located above the main circuit conductor, and closes the first opening except for the main circuit conductor.

6. A molded case circuit breaker according to claim 1, characterized in that: The base is provided with a first wiring channel in the transformer installation area, and the first wiring channel is connected to the back of the base; a second wiring channel is provided on the second bottom wall, and the second wiring channel corresponds to and is connected to the first wiring channel, so that the back of the base is connected to the first accommodating space.

7. A molded case circuit breaker according to claim 1, characterized in that: A partition wall is provided between the contact arc extinguishing area of ​​each pole space and the transformer installation area, and a first opening for the main circuit conductor to pass through is provided on the partition wall; The circumferential side wall includes a first circumferential side wall, which separates the first opening from the first accommodating space; the second bottom wall includes alternately arranged protruding parts and recessed parts, and the number of the protruding parts corresponds to the number of the main circuit conductors; the partition groove is located in the protruding part, and the partition groove has an overlapping part with the first opening for the main circuit conductor to pass through.

8. The molded case circuit breaker according to claim 1, characterized in that: The main circuit conductor includes a second terminal board located in the second terminal area; the peripheral side wall includes a second peripheral side wall, which separates the first accommodating space from the second terminal area; a wiring groove is opened on the second peripheral side wall, and a sampling point is provided on the second terminal board, and the wiring groove is located above the sampling point.

9. The molded case circuit breaker according to claim 1, characterized in that: One of the pole spaces is a first pole space, and the length dimension of the contact arc extinguishing area of ​​the first pole space is greater than the length dimensions of the contact arc extinguishing areas of the remaining pole spaces, so that the length dimension of the transformer installation area located at the first pole space is smaller than the length dimension of the transformer installation area located at the remaining pole spaces; And / or, the circuit board bracket and the base are fixed by a fastening structure, and the fastening structure is one or more of fastening with fasteners, clamping fixation, and interference fit.

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