Terminal cover and circuit breaker

Abstract

The utility model relates to circuit breaker technical field especially terminal cover and circuit breaker, terminal cover includes casing and arc extinguishing spare, casing includes casing and baffle, and at least two chambers are provided side by side along length direction in casing, and baffle is provided in each chamber, and baffle divides corresponding chamber into arc extinguishing chamber and wire cavity arranged up and down along height direction, and the one end of casing towards circuit breaker body is provided with the air inlet that communicates with arc extinguishing chamber, and wire cavity penetrates casing and along width direction both ends. Casing is configured to install in the side with terminal of circuit breaker body, and arc extinguishing chamber is opposite with arc extinguishing chamber of circuit breaker body and sets up, and wire cavity is opposite with terminal and sets up. Arc extinguishing spare sets up in arc extinguishing chamber. Circuit breaker includes above-mentioned terminal cover, and the side with terminal of circuit breaker body is installed with terminal cover, improves arc extinguishing capacity, realizes zero fly arc function, and avoids arc gas to cause damage to wire harness to lead to short circuit, improves the safety of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a terminal cover and a circuit breaker. Background Technology

[0002] During the short-circuit breaking process, a large number of electric arcs are generated by the molded case circuit breaker. During the arc extinguishing process in the arc extinguishing chamber inside the circuit breaker, a large amount of high-temperature ionized gas (i.e., arc gas) is released to the outside of the circuit breaker. The arc gas contains a large number of metal ions, which can easily cause phase-to-phase breakdown under high voltage and small electrical clearance conditions, and at the same time cause varying degrees of damage to the equipment around the circuit breaker.

[0003] To achieve zero arc flash functionality, a terminal cover is installed on the side of the circuit breaker body with terminals. An arc-extinguishing component (or anti-ionization component) is installed in the upper part of the terminal cover. Arc gas passes sequentially through the arc-extinguishing chamber and the arc-extinguishing component for better arc suppression. The existing terminal cover has the following problems: Firstly, because the bottom of the terminal cover has a wire passage cavity, arc gas can easily escape from the cavity, weakening the arc-extinguishing capability and making it difficult to guarantee the zero arc flash functionality of the circuit breaker. Secondly, external wiring harnesses pass through the passage cavity and connect to the terminals of the circuit breaker body. Since the wiring harness is located directly below the arc-extinguishing cavity, arc gas can easily damage the wiring harness, leading to a short circuit and reducing the safety of the circuit breaker. Utility Model Content

[0004] The purpose of this utility model is to provide a terminal cover and a circuit breaker to improve the arc suppression capability of the terminal cover, achieve zero arcing function, and at the same time avoid the arc gas in the terminal cover from damaging the wire harness and causing a short circuit, thereby improving the safety of the circuit breaker.

[0005] To achieve this objective, the technical solution adopted by this utility model is as follows:

[0006] Terminal cover, including:

[0007] The housing includes a housing and a baffle. At least two chambers are arranged side by side along the length of the housing. Each chamber is provided with the baffle. The baffle divides the corresponding chamber into an arc-extinguishing chamber and a wire-passing chamber arranged vertically along the height. An air inlet communicating with the arc-extinguishing chamber is provided at one end of the housing facing the circuit breaker body. The wire-passing chamber passes through both ends of the housing along the width direction.

[0008] The housing is configured to be installed on the side of the circuit breaker body with terminals, the arc extinguishing chamber is directly opposite the arc extinguishing chamber of the circuit breaker body, and the line passage chamber is directly opposite the terminals;

[0009] An arc-extinguishing component is disposed within the arc-extinguishing cavity.

[0010] As an optional embodiment, the housing includes a top plate, side plates, and a partition. The two side plates are spaced apart along the length direction, and the top ends of the two side plates are respectively connected to the two ends of the top plate along the length direction. The partition is located between the two side plates, and the top end of the partition is connected to the top plate, so as to divide the interior of the housing into at least two chambers.

[0011] A baffle is provided between each of the side plates and the adjacent partition; or, a baffle is provided between each of the side plates and the adjacent partition, and a baffle is provided between two adjacent partitions.

[0012] As an optional solution, the side plate is provided with a plurality of weight-reducing grooves at intervals along the height direction on the side facing the circuit breaker body, and a reinforcing plate is formed between two adjacent weight-reducing grooves.

[0013] As an optional solution, the housing further includes a bottom plate, the top plate, the baffle and the bottom plate are spaced apart along the height direction, the bottom ends of the two side plates are respectively connected to the two ends of the bottom plate along the length direction, and the bottom end of the partition is connected to the bottom plate.

[0014] As an optional solution, the housing also includes a front panel, which is disposed on the side of the arc-extinguishing cavity away from the circuit breaker body, and the front panel is provided with an air outlet communicating with the arc-extinguishing cavity.

[0015] As an optional solution, the inner sidewall of the front panel is provided with a column, and the arc-extinguishing component is supported on the column and locked to the column by fasteners.

[0016] As an optional solution, the front panel is provided with a first mounting groove, which extends through both ends of the top plate along the height direction, and the first mounting groove is configured to be inserted into the arc-damping plate.

[0017] As an optional solution, the top plate extends toward the side of the circuit breaker body and is provided with a mounting part, which is used to overlap and fix to the top of the circuit breaker body.

[0018] As an optional solution, the bottom of the partition plate facing the circuit breaker body has a locking protrusion, and the side of the circuit breaker body with the terminal is provided with a second mounting groove, which extends through both ends of the circuit breaker body along the height direction; the partition plate is inserted into the second mounting groove and the locking protrusion abuts against the inner sidewall of the second mounting groove.

[0019] As an optional solution, the mounting part is provided with a clearance hole, and the circuit breaker body is provided with a wiring hole along the height direction for the installation tool to pass through. When the mounting part overlaps the circuit breaker body, the clearance hole communicates with the corresponding wiring hole.

[0020] As an optional solution, at least a portion of the inner sidewall of the arc-extinguishing cavity is provided with reinforcing ribs, the reinforcing ribs (18) extending along the width direction, and the circumferential side of the arc-extinguishing component abutting against the reinforcing ribs.

[0021] As an optional feature, the reinforcing rib is provided with a guide surface at the end closest to the air inlet.

[0022] A circuit breaker, comprising a circuit breaker body and the aforementioned terminal cover, wherein the terminal cover is mounted on the side of the circuit breaker body having terminals.

[0023] The beneficial effects of this utility model are as follows:

[0024] The terminal cover proposed in this utility model divides the corresponding chambers into an arc-extinguishing chamber and a wire-passing chamber arranged vertically along the height direction using a baffle. The cover is installed on the side of the circuit breaker body with terminals. The arc-extinguishing chamber is directly opposite the arc-extinguishing chamber of the circuit breaker body, and the wire-passing chamber is directly opposite the terminals. This allows the arc gas from the arc-extinguishing chamber of the circuit breaker body to enter the arc-extinguishing chamber, where the arc-extinguishing component extinguishes the arc gas, significantly reducing the arc content. Furthermore, the baffle improves the sealing of the arc-extinguishing chamber, preventing the arc gas from entering the wire-passing chamber and exiting the terminal cover, thus improving the arc-extinguishing capability of the terminal cover and achieving zero-flashover functionality. Simultaneously, it prevents the arc gas in the arc-extinguishing chamber from damaging the wiring harness and causing a short circuit, improving safety.

[0025] The circuit breaker proposed in this utility model improves the arc suppression capability of the circuit breaker by using the aforementioned terminal cover, achieving zero arcing function, and also avoids the arc gas in the arc suppression cavity from damaging the wiring harness and causing a short circuit, thus improving safety. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the circuit breaker body provided in this embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the circuit breaker provided in this embodiment of the utility model;

[0028] Figure 3 This is a first structural schematic diagram of the terminal cover provided in this embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the second structure of the terminal cover provided in this embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the third structure of the terminal cover provided in this embodiment of the utility model.

[0031] The component names and labels in the diagram are as follows:

[0032] 10. Circuit breaker body; 101. Terminal; 102. Second mounting slot; 103. Wiring hole; 104. Threaded hole;

[0033] 1. Shell; 11. Arc suppression cavity; 12. Cable passage cavity; 13. Top plate; 131. Mounting part; 1311. Clearance hole; 1312. Through hole; 14. Side plate; 141. Weight reduction groove; 142. Reinforcing plate; 15. Partition plate; 151. Clip protrusion; 16. Bottom plate; 17. Front panel; 171. Vent hole; 172. Column; 173. First mounting groove; 18. Reinforcing rib; 181. Guide surface; 2. Baffle; 3. Arc suppression component. Detailed Implementation

[0034] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 and Figure 2 As shown in the figure, this embodiment proposes a circuit breaker, which includes a circuit breaker body 10 and a terminal cover. The front end of the circuit breaker body 10 is provided with an arc-extinguishing chamber and a terminal 101, which can be connected to an external wiring harness. The circuit breaker body 10 has a wiring hole 103 along the height direction (up and down direction in the figure) for installation tools to pass through. Below the wiring hole 103 is the wiring stud of the terminal 101. After the wiring lug of the external wiring harness is placed in the position of the wiring stud, the installation tool (such as a screwdriver) passes through the wiring hole 103 from top to bottom and screws the wiring stud to tighten the wiring lug, thereby realizing the electrical connection between the terminal 101 and the wiring harness. In order to achieve zero arcing, a terminal cover is installed on the side of the circuit breaker body 10 with the terminal 101 to block and separate the arc gas ejected from the arc-extinguishing chamber, so as to significantly reduce the amount of arc in the arc gas, avoid short circuit caused by arcing, and improve the safety of the circuit breaker.

[0040] The existing terminal cover has the following problems: because the bottom of the terminal cover has a wire passage cavity, on the one hand, arc gas can easily be ejected from the wire passage cavity and the terminal cover is weakened, making it difficult to guarantee the zero arc function of the circuit breaker; on the other hand, after the external wire harness passes through the wire passage cavity and is connected to the terminal of the circuit breaker body, the wire harness is located directly below the arc suppression cavity, and the arc gas can easily damage the wire harness, causing a short circuit and reducing the safety of the circuit breaker.

[0041] To solve the above problems, such as Figure 3 and Figure 4As shown, this embodiment proposes a terminal cover, which includes a housing and an arc-extinguishing component 3. The housing includes a shell 1 and a baffle 2. At least two chambers are arranged side-by-side along the length direction (left-right direction in the figure) inside the shell 1. Each chamber is equipped with a baffle 2, which divides the corresponding chamber into an arc-extinguishing chamber 11 and a wire-passing chamber 12 arranged vertically along the height direction. An air inlet communicating with the arc-extinguishing chamber 11 is provided at the end of the shell 1 facing the circuit breaker body 10. The wire-passing chamber 12 penetrates both ends of the shell 1 along the width direction (front-back direction in the figure). The housing is configured to be installed on the side of the circuit breaker body 10 with the terminal 101. The arc-extinguishing chamber 11 is directly opposite the arc-extinguishing chamber of the circuit breaker body 10, and the wire-passing chamber 12 is directly opposite the terminal 101. The arc-extinguishing component 3 is disposed within the arc-extinguishing chamber 11.

[0042] The baffle 2 divides the corresponding chambers into an arc-extinguishing chamber 11 and a wire-passing chamber 12, which are arranged vertically along the height direction. The cover is installed on the side of the circuit breaker body 10 with the terminal 101. The arc-extinguishing chamber 11 is directly opposite the arc-extinguishing chamber of the circuit breaker body 10, and the wire-passing chamber 12 is directly opposite the terminal 101. This allows the arc gas from the arc-extinguishing chamber of the circuit breaker body 10 to enter the arc-extinguishing chamber 11. The arc-extinguishing component 3 performs arc-extinguishing treatment on the arc gas to significantly reduce the arc content. Moreover, the baffle 2 improves the sealing of the arc-extinguishing chamber 11, preventing the arc gas in the arc-extinguishing chamber 11 from entering the wire-passing chamber 12 and being ejected from the terminal cover from the wire-passing chamber 12. This improves the arc-extinguishing capability of the terminal cover and achieves zero arc flash functionality. At the same time, it can prevent the arc gas in the arc-extinguishing chamber 11 from damaging the wiring harness and causing a short circuit, thus improving safety.

[0043] like Figure 3 and Figure 4 As shown, the housing 1 includes a top plate 13, side plates 14, and a partition 15. Two side plates 14 are spaced apart along their length, and the top ends of the two side plates 14 are respectively connected to the two ends of the top plate 13 along its length. The partition 15 is located between the two side plates 14, and its top end is connected to the top plate 13, thus dividing the interior of the housing 1 into at least two chambers. In this embodiment, there is one partition 15 to divide the interior of the housing 1 into two chambers, and two baffles 2 are respectively installed in the corresponding chambers, such that a baffle 2 is provided between each side plate 14 and the adjacent partition 15. In other embodiments, there may be two or more partitions 15 to divide the interior of the housing 1 into at least three chambers. In the leftmost and rightmost chambers, baffles 2 are provided between adjacent side plates 14 and partitions 15. In the middle chamber, a baffle 2 is provided between two adjacent partitions 15.

[0044] Furthermore, the shell 1 also includes a bottom plate 16, a top plate 13, a baffle 2, and the bottom plate 16 are spaced apart along the height direction. The bottom ends of the two side plates 14 are respectively connected to the two ends of the bottom plate 16 along the length direction. The bottom end of the partition 15 is connected to the bottom plate 16. By setting the bottom plate 16, the overall structural strength and stability of the shell 1 are enhanced, and deformation of the shell 1 is prevented after arcing in the arc extinguishing chamber.

[0045] like Figure 3 As shown, the housing 1 also includes a front panel 17, which is disposed on the side of the arc-extinguishing chamber 11 away from the circuit breaker body 10. The front panel 17 is provided with a vent 171 communicating with the arc-extinguishing chamber 11. By providing the front panel 17, the sealing performance of the arc-extinguishing chamber 11 is further improved, which is beneficial to improving the structural strength and stability of the housing 1. At the same time, the vent 171 on the front panel 17 allows the vent 171 to further extinguish the arc gas. The arc gas is blocked and divided by the arc-extinguishing component 3 and the vent 171, which effectively reduces the amount of arc ejected from the vent 171, so as to ensure the zero-arc function of the terminal cover.

[0046] It should be noted that the front panel 17 has multiple vent holes 171, which are either strip-shaped holes or Z-shaped holes. In other embodiments, the shape, number, and distribution of the vent holes 171 can be flexibly adjusted to ensure smooth discharge of arc gas while improving the aesthetics of the front panel 17.

[0047] In addition, such as Figure 3 and Figure 4 As shown, the front panel 17 is provided with a first mounting groove 173, which extends through both ends of the top plate 13 along its height direction. The first mounting groove 173 is configured to interlock with the arc-isolating plate. By providing the first mounting groove 173 on the front panel 17, it is convenient to interlock and install the arc-isolating plate on the front panel 17, thereby achieving stable installation of the arc-isolating plate. The aforementioned arc-isolating plate is mainly used to effectively isolate the arc gas between different terminals 101, improving the safety of the circuit breaker.

[0048] In this embodiment, the housing is an injection molded part. The top plate 13, side plate 14, partition 15, baffle 2, bottom plate 16 and front panel 17 are integrally formed by injection molding, which reduces the processing difficulty and processing cost of the housing and improves the structural strength of the housing.

[0049] like Figure 4 and Figure 5As shown, the side plate 14 facing the circuit breaker body 10 has multiple weight-reducing grooves 141 spaced apart along its height, and a reinforcing plate 142 is formed between two adjacent weight-reducing grooves 141. By providing weight-reducing grooves 141 on the two side plates 14, the weight of the housing 1 and the injection molding cost are reduced, which is beneficial to achieving a lightweight design of the housing 1. At the same time, the formation of multiple reinforcing plates 142 on the side plate 14 further improves the structural strength and stability of the housing 1.

[0050] like Figures 2-4 As shown, a mounting portion 131 extends from the top plate 13 toward the circuit breaker body 10, and is used to overlap and fix it to the top of the circuit breaker body 10. The mounting portion 131 extends outward toward the rear side of the top plate 13, and is plate-shaped and connected to the top plate 13 in a stepped structure. Along the height direction, the top surface of the mounting portion 131 is higher than the top surface of the top plate 13. The mounting portion 131 overlaps and is fixed to the top of the circuit breaker body 10. The left and right side plates 14 of the housing 1 are fitted into the grooves on the left and right sides of the circuit breaker body 10, so that the outer surfaces of the two side plates 14 correspond to and are coplanar with the left and right sides of the circuit breaker body 10, respectively. The bottom plate 16 abuts against the front side of the circuit breaker body 10 to achieve stable assembly of the terminal cover, which is beneficial to improving the sealing performance of the arc suppression cavity 11.

[0051] Specifically, the mounting part 131 is provided with through holes 1312 spaced along its length, and the top of the circuit breaker body 10 is provided with two threaded holes 104. When the mounting part 131 overlaps the top of the circuit breaker body 10, the two through holes 1312 and the two threaded holes 104 are connected one-to-one. After the screw or bolt passes through the through hole 1312, it is tightened into the corresponding threaded hole 104, thereby locking the mounting part 131 and the circuit breaker body 10. This makes the assembly operation of the terminal cover simple, improves the assembly efficiency of the terminal cover, and improves the connection strength between the circuit breaker body 10 and the terminal cover.

[0052] Furthermore, the mounting part 131 is provided with a clearance hole 1311. When the mounting part 131 overlaps with the circuit breaker body 10, the clearance hole 1311 communicates with the corresponding wiring hole 103. By providing the clearance hole 1311, when tightening the wiring stud of the terminal 101, the installation tool passes through the clearance hole 1311 and the wiring hole 103 from top to bottom and extends into the position of the wiring stud, avoiding interference between the terminal cover and the wiring tool. This ensures that the terminal cover, after being installed on the circuit breaker body 10, will not affect the wiring function of the circuit breaker body 10.

[0053] In this embodiment, a locking protrusion 151 protrudes from the bottom of the partition 15 facing the circuit breaker body 10. A second mounting groove 102 is provided on the side of the circuit breaker body 10 with terminals 101, extending through both ends of the circuit breaker body 10 along its height. The partition 15 is inserted into the second mounting groove 102, and the locking protrusion 151 abuts against the inner wall of the second mounting groove 102. The partition 15 extends to the outside of the base plate 16 from the side facing the circuit breaker body 10 (i.e., the rear side of the partition 15), and the locking protrusion 151 is provided at the bottom of the rear side of the partition 15. When the terminal cover is installed from top to bottom, the locking protrusion 151 extends into the second mounting groove 102 along with the partition 15, guiding the terminal cover to be quickly assembled into the circuit breaker body 10. This provides a good guiding and limiting effect on the assembly of the terminal cover, improving the assembly accuracy and efficiency of the terminal cover. After the partition 15 and the latch 151 are assembled in place, the latch 151 abuts against the inner wall of the second mounting groove 102 to improve the stability of the terminal cover installation. At the same time, the mounting part 131 overlaps the top of the circuit breaker body 10, and the through hole 1312 of the mounting part 131 is directly connected to the threaded hole 104 of the circuit breaker body 10, so that the mounting part 131 can be tightened to the top of the circuit breaker body 10 by bolts or screws.

[0054] like Figure 4 and Figure 5 As shown, a column 172 is provided on the inner sidewall of the front panel 17. The arc-extinguishing component 3 is supported on the column 172 and locked to the column 172 by fasteners. The fasteners are bolts or screws, etc. The column 172 is located on the inner bottom wall of the arc-extinguishing cavity 11 (i.e., the inner sidewall of the front panel 17), so that the arc-extinguishing component 3 and the front panel 17 are spaced apart along the width direction (front and back direction in the figure), so that the arc-extinguishing component 3 and the vent 171 sequentially block and divide the arc gas in segments, effectively reducing the amount of arc in the arc gas, so as to ensure the zero-arc function of the terminal cover.

[0055] Specifically, the arc-extinguishing component 3 can be a conventional arc-extinguishing part such as an arc-extinguishing mesh plate or an arc-extinguishing assembly, and is not specifically limited here. In this embodiment, the arc-extinguishing component 3 is a single piece of arc-extinguishing mesh plate. Of course, the number of arc-extinguishing components 3 can be flexibly adjusted according to the arc-extinguishing requirements. For example, two, three, or more arc-extinguishing components 3 can be installed. In other embodiments, the number of arc-extinguishing components 3 can also be multiple, and multiple arc-extinguishing components 3 are installed at intervals along the width direction in the arc-extinguishing cavity 11 to improve the arc-extinguishing effect.

[0056] In this embodiment, at least a portion of the inner sidewall of the arc-extinguishing cavity 11 is provided with reinforcing ribs 18 extending along the width direction, and the circumferential side of the arc-extinguishing component 3 abuts against the reinforcing ribs 18. By providing reinforcing ribs 18, on the one hand, the structural strength of the arc-extinguishing cavity 11 is improved, preventing structural deformation of the arc-extinguishing cavity 11 when arc gas is injected, thus improving the overall structural strength and stability of the terminal cover. On the other hand, the circumferential side of the arc-extinguishing component 3 abuts against the reinforcing ribs 18 to circumferentially limit the arc-extinguishing component 3, enabling the arc-extinguishing component 3 to be installed within the arc-extinguishing cavity 11 in a limited manner.

[0057] like Figure 5 As shown, some of the reinforcing ribs 18 have stepped surfaces, and the stepped surfaces are flush with the top of the column 172. The arc-extinguishing component 3 is supported and installed on the stepped surfaces of the column 172 and the reinforcing ribs 18 to achieve reliable support for the arc-extinguishing component 3 and prevent the arc-extinguishing component 3 from tilting.

[0058] Furthermore, the reinforcing rib 18 is provided with a guide surface 181 at the end near the air inlet. By providing the guide surface 181, the arc-extinguishing component 3 is guided to quickly align and enter the arc-extinguishing cavity 11, thereby improving the assembly efficiency of the arc-extinguishing component 3.

[0059] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A terminal cover, characterized in that, include: The housing includes a housing (1) and a baffle (2). The housing (1) has at least two chambers arranged side by side along the length direction. Each chamber is provided with a baffle (2). The baffle (2) divides the corresponding chamber into an arc-extinguishing chamber (11) and a line-passing chamber (12) arranged vertically along the height direction. The housing (1) has an air inlet communicating with the arc-extinguishing chamber (11) at one end facing the circuit breaker body (10). The line-passing chamber (12) passes through both ends of the housing (1) along the width direction. The housing is configured to be installed on the side of the circuit breaker body (10) having terminals (101), the arc extinguishing chamber (11) is directly opposite the arc extinguishing chamber of the circuit breaker body (10), and the line passage chamber (12) is directly opposite the terminals (101). Arc-extinguishing component (3) is disposed in the arc-extinguishing cavity (11).

2. The terminal cover according to claim 1, characterized in that, The housing (1) includes a top plate (13), side plates (14) and a partition (15). The two side plates (14) are spaced apart along the length direction, and the top ends of the two side plates (14) are respectively connected to the two ends of the top plate (13) along the length direction. The partition (15) is located between the two side plates (14), and the top end of the partition (15) is connected to the top plate (13) to divide the interior of the housing (1) into at least two chambers. A baffle (2) is provided between each of the side plates (14) and the adjacent partition (15); or, a baffle (2) is provided between each of the side plates (14) and the adjacent partition (15), and a baffle (2) is provided between two adjacent partitions (15).

3. The terminal cover according to claim 2, characterized in that, The side plate (14) facing the circuit breaker body (10) has a plurality of weight-reducing grooves (141) spaced apart along the height direction, and a reinforcing plate (142) is formed between two adjacent weight-reducing grooves (141).

4. The terminal cover according to claim 2, characterized in that, The housing (1) also includes a bottom plate (16), the top plate (13), the baffle (2) and the bottom plate (16) are spaced apart along the height direction, the bottom ends of the two side plates (14) are respectively connected to the two ends of the bottom plate (16) in the length direction, and the bottom end of the partition (15) is connected to the bottom plate (16).

5. The terminal cover according to claim 2, characterized in that, The housing (1) also includes a front panel (17), which is disposed on the side of the arc-extinguishing cavity (11) away from the circuit breaker body (10). The front panel (17) is provided with an air outlet (171) communicating with the arc-extinguishing cavity (11).

6. The terminal cover according to claim 5, characterized in that, The inner wall of the front panel (17) is provided with a column (172), and the arc-extinguishing component (3) is supported on the column (172) and is locked to the column (172) by fasteners.

7. The terminal cover according to claim 5, characterized in that, The front panel (17) is provided with a first mounting groove (173), which extends through both ends of the top plate (13) along the height direction. The first mounting groove (173) is configured to be inserted into the arc-blocking plate.

8. The terminal cover according to claim 2, characterized in that, The top plate (13) extends toward the side of the circuit breaker body (10) and is provided with a mounting part (131), which is used to overlap and fix to the top of the circuit breaker body (10).

9. The terminal cover according to claim 8, characterized in that, The bottom of the partition (15) facing the circuit breaker body (10) is provided with a locking protrusion (151). The side of the circuit breaker body (10) with the terminal (101) is provided with a second mounting groove (102). The second mounting groove (102) passes through both ends of the circuit breaker body (10) along the height direction. The partition (15) is inserted into the second mounting groove (102) and the locking protrusion (151) abuts against the inner sidewall of the second mounting groove (102).

10. The terminal cover according to claim 8, characterized in that, The mounting part (131) is provided with a clearance hole (1311), and the circuit breaker body (10) is provided with a wiring hole (103) for the installation tool to pass through along the height direction. When the mounting part (131) overlaps the circuit breaker body (10), the clearance hole (1311) communicates with the corresponding wiring hole (103).

11. The terminal cover according to any one of claims 1-9, characterized in that, At least a portion of the inner wall of the arc-extinguishing cavity (11) is provided with reinforcing ribs (18) in the circumferential direction. The reinforcing ribs (18) extend in the width direction, and the circumferential side of the arc-extinguishing component (3) abuts against the reinforcing ribs (18).

12. The terminal cover according to claim 11, characterized in that, The reinforcing rib (18) has a guide surface (181) at the end closest to the air inlet.

13. A circuit breaker, characterized in that, The circuit breaker includes a circuit breaker body (10) and a terminal cover according to any one of claims 1-12, wherein the terminal cover is mounted on the side of the circuit breaker body (10) having a terminal (101).

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