Circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a circuit breaker, which comprises a shell, a mutual inductor, a circuit board, a main lead, a tripping assembly and a testing mechanism, the testing mechanism comprises a testing button, a testing spring, a testing wire assembly and a testing cover plate, the testing button is installed on the shell in a pressing mode, and the end, located in the shell, of the testing button is connected with a first supporting arm of the testing spring; a second support arm of the test spring is electrically connected with the main lead, the main lead penetrates through the mutual inductor, and the mutual inductor and the main lead are electrically connected with the circuit board; the first end of the test line assembly is fixed on the inner wall of the shell, and the second end is electrically connected with the circuit board; the test cover plate is arranged between the first support arm of the test spring and part of the test wire assembly and the tripping assembly, and the tripping assembly is electrically connected with the circuit board; when the test button is in a pressed state, the first support arm of the test spring is electrically connected with the first end of the test line assembly. The circuit breaker has stable use performance.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker. Background Art

[0002] Circuit breakers are essential switching devices in power distribution circuits, and they play a protective and control role in power systems. When an overload, short circuit or leakage occurs in the circuit where the circuit breaker is located, the circuit breaker can detect and automatically disconnect.

[0003] In order to regularly check whether the leakage function of the circuit breaker fails, the circuit breaker is usually provided with a test mechanism, through which a current is generated to automatically cut off the circuit. However, the test mechanism of the circuit breaker is usually arranged adjacent to the actuator, which may interfere with the actuator during use and cause the test function to fail. Utility Model Content

[0004] In view of this, the utility model provides a circuit breaker, which can overcome the problems existing in the related technology, avoid the failure of the test function, and ensure the stability of the circuit breaker performance.

[0005] The utility model provides a circuit breaker, which comprises a housing, a mutual inductor, a circuit board, a main conductor, a trip assembly and a testing mechanism;

[0006] The test mechanism comprises a test button, a test spring, a test line assembly and a test cover plate, wherein the test button can be pressed and installed on the housing, and one end of the test button located in the housing is connected to the first arm of the test spring; the second arm of the test spring is electrically connected to the main conductor, the main conductor passes through the mutual inductor, and the mutual inductor and the main conductor are both electrically connected to the circuit board; the first end of the test line assembly is fixed on the inner wall of the housing, and the second end is electrically connected to the circuit board; the test cover plate is arranged between the first arm of the test spring and part of the test line assembly and the trip assembly, and the trip assembly is electrically connected to the circuit board;

[0007] When the test button is in a pressed state, the first arm of the test spring is electrically connected to the first end of the test line assembly, and the trip assembly performs a tripping action; when the test button is in a non-pressed state, the first arm of the test spring is electrically disconnected from the first end of the test line assembly.

[0008] In a possible implementation, the test line assembly includes a test line and a test spring;

[0009] The test spring is fixed on the inner wall of the housing and is electrically connected to the first arm of the test spring when the test button is in a pressed state;

[0010] One end of the test line is connected to the test spring, and the other end is connected to the circuit board.

[0011] In a possible implementation, the test spring includes a bending portion and a connecting portion;

[0012] The bent portion is fixed on the inner wall of the shell;

[0013] The connecting portion is located at a side of the bending portion close to the circuit board and is connected to the test line.

[0014] In a possible implementation, the inner wall of the housing has a first column and a first slot;

[0015] The bending portion is sleeved on the first column and installed in the first slot.

[0016] In a possible implementation, the inner wall of the housing has a second column and a second slot;

[0017] The test spring is sleeved on the second cylinder;

[0018] The second slot is located at a side of the second column close to the circuit board, and part of the test wires are installed in the second slot.

[0019] In a possible implementation manner, an accommodation space is formed between the test cover plate and the inner wall of the housing, and the first column and the second column are located in the accommodation space.

[0020] In a possible implementation, the test cover plate has a positioning hole and a fixing hole;

[0021] One end of the first column extends into the positioning hole, and one end of the second column extends into the fixing hole.

[0022] In a possible implementation manner, there is a gap between the second arm of the test spring and the inner wall of the housing, and the test line passes through the gap.

[0023] In a possible implementation manner, the inner wall of the housing has a third slot, and the test cover plate is installed in the third slot.

[0024] In a possible implementation, the trip assembly includes a tripper and an actuator;

[0025] The release is connected to the circuit board and is located on a side of the actuator close to the circuit board;

[0026] The first arm of the test spring and a part of the test line assembly are arranged between the actuator and the test cover plate.

[0027] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0028] The circuit breaker provided by the embodiment of the utility model, when a leakage test is required, only needs to press the test button arranged at the joint of the shell to complete the test. When the test button is in a pressed state, the first arm of the test spring located at one end of the test button in the shell is electrically connected to the first end of the test line assembly arranged on the inner wall of the shell, so that a power supply circuit is formed between the test spring, the test line assembly and the circuit board, and the mutual inductor feeds back to the circuit board after detecting the leakage signal, and the circuit board controls the trip assembly to perform the tripping action, indicating that the leakage function of the circuit breaker is effective, otherwise, it indicates that the leakage function of the circuit breaker is invalid.

[0029] Since the test mechanism of the circuit breaker is provided with a test cover between the trip assembly and the first arm of the test spring and part of the test line assembly, the test cover can be used to separate the test mechanism from the trip assembly and to limit the test spring and the test line assembly, thereby avoiding failure of the test function and ensuring the stability of the circuit breaker performance.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic structural diagram of an exemplary circuit breaker provided in an embodiment of the utility model;

[0033] Figure 2 A cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a normal working state;

[0034] Figure 3 A cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a state of testing a leakage function;

[0035] Figure 4 A cross-sectional view of a circuit breaker at a testing mechanism in an exemplary circuit breaker provided in an embodiment of the utility model;

[0036] Figure 5A schematic diagram of the structure of a test line assembly in an exemplary circuit breaker provided by an embodiment of the utility model;

[0037] Figure 6 A partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a normal working state;

[0038] Figure 7 A partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model;

[0039] Figure 8 A partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model;

[0040] Fig. 9 A cross-sectional view of an exemplary circuit breaker provided in accordance with an embodiment of the present invention.

[0041] The reference numerals in the figures represent respectively:

[0042] 1. housing; 11. first column; 12. first slot; 13. second column; 14. second slot;

[0043] 2. Transformer;

[0044] 3. Circuit board;

[0045] 4. Main line;

[0046] 5. Trip assembly; 51. Trip device; 52. Actuator;

[0047] 6. Test mechanism; 61. Test button; 62. Test spring; 621. First arm; 622. Second arm; 63. Test line assembly; 6301. First end; 6302. Second end; 631. Test line; 632. Test spring; 6321. Bend portion; 6322. Connecting portion; 64. Test cover; 641. Positioning hole; 642. Fixing hole; 65. Accommodating space; 66. Third slot; 67. Gap;

[0048] 7. Handle;

[0049] X, width direction of the circuit breaker;

[0050] Y, length direction of the circuit breaker;

[0051] Z, height direction of the circuit breaker.

[0052] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] In the description of the present invention, it should be understood that some directional terms are based on the directions or positional relationships shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In the embodiments of the present invention, such as "upper", "lower", "side", etc., generally, the terms "upper", "lower", "side", etc. are used as the reference numerals. Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0055] In order to make the technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0056] In view of the problem that the testing mechanism of the circuit breaker in the related art is usually arranged adjacent to the actuator, which may interfere with the actuator during use and cause the testing function to fail, the embodiment of the utility model provides a circuit breaker to solve the problem existing in the related art.

[0057] Figure 1 A schematic diagram of the structure of an exemplary circuit breaker provided in an embodiment of the utility model, wherein X in the figure represents the width direction of the circuit breaker, Y represents the length direction of the circuit breaker, and Z represents the height direction of the circuit breaker; Figure 2 A cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a normal working state; Figure 3 A cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a state of testing leakage function. Figure 1 , Figure 2 and Figure 3 The utility model provides a circuit breaker, which includes a housing 1, a mutual inductor 2, a circuit board 3, a main conductor 4, a trip assembly 5 and a testing mechanism 6.

[0058] Among them, the testing mechanism 6 includes a testing button 61, a testing spring 62, a testing line assembly 63 and a testing cover 64. The testing button 61 can be pressed and installed on the shell 1, and one end located in the shell 1 is connected to the first arm 621 of the testing spring 62; the second arm 622 of the testing spring 62 is electrically connected to the main conductor 4, the main conductor 4 passes through the mutual inductor 2, and the mutual inductor 2 and the main conductor 4 are both electrically connected to the circuit board 3; the first end 6301 of the testing line assembly 63 is fixed on the inner wall of the shell 1, and the second end 6302 is electrically connected to the circuit board 3; the testing cover 64 is arranged between the first arm 621 of the testing spring 62 and part of the testing line assembly 63 and the tripping assembly 5, and the tripping assembly 5 is electrically connected to the circuit board 3.

[0059] When the test button 61 is in a pressed state, that is, the circuit breaker is in a state of testing the leakage function, the first arm 621 of the test spring 62 is electrically connected to the first end 6301 of the test line assembly 63, so that a power supply circuit is formed between the test spring 62, the test line assembly 63 and the circuit board 3. After detecting the leakage signal, the mutual inductor 2 feeds back to the circuit board 3, and the circuit board 3 controls the trip assembly 5 to perform the tripping action. If the trip assembly 5 performs the tripping action, it means that the leakage function of the circuit breaker is effective; if the trip assembly 5 does not perform the tripping action, it means that the leakage function of the circuit breaker is invalid.

[0060] When the test button 61 is in a non-pressed state, that is, the circuit breaker is in a normal working state, the first arm 621 of the test spring 62 is electrically disconnected from the first end 6301 of the test line assembly 63 .

[0061] It should be noted that in the embodiment of the utility model, the second arm 622 of the test spring 62 is directly electrically connected to the yoke, the yoke is electrically connected to the coil, and the coil is electrically connected to the main conductor 4, that is, the second arm 622 of the test spring 62 is electrically connected to the main conductor 4 through the yoke and the coil.

[0062] Therefore, in the circuit breaker provided by the embodiment of the utility model, since the test mechanism 6 is provided with a test cover 64 between the trip assembly 5 and the first arm 621 of the test spring 62 and part of the test line assembly 63, the test cover 64 can be used to separate the test mechanism 6 from the trip assembly 5, and to limit the test spring 62 and the test line assembly 63, so as to avoid failure of the test function and ensure the stability of the circuit breaker performance. Figure 2 As shown, the test mechanism 6 of the circuit breaker occupies a relatively small space, which is about the size of half a fingernail. On the premise of being able to meet the leakage test function, it can also assist in achieving the narrow body design requirement of the circuit breaker.

[0063] In some embodiments, see Figure 1 , the test button 61 is arranged on one side of the handle 7 of the circuit breaker and is adjacent to the handle 7. In addition, see Figure 1 The test button 61 can be set at the joint of the shell 1.

[0064] In some embodiments, see Figure 4 ,in Figure 4 A cross-sectional view of a circuit breaker at a test mechanism in an exemplary circuit breaker provided in an embodiment of the utility model, wherein the inner wall of the housing 1 has a third slot 66 , and the test cover 64 is installed in the third slot 66 to limit the test cover 64 by using the third slot 66 .

[0065] In some embodiments, see Figure 5 ,in Figure 5 The present invention is a schematic structural diagram of an exemplary test line assembly in a circuit breaker provided in an embodiment of the present invention. The test line assembly 63 includes a test line 631 and a test spring 632 .

[0066] The test spring 632 is fixed on the inner wall of the housing 1 and is Figure 3 As shown, when the test button 61 is in a pressed state, it is electrically connected to the first arm 621 of the test spring 62 ; one end of the test line 631 is connected to the test spring 632 , and the other end is connected to the circuit board 3 .

[0067] Such an arrangement facilitates the first arm 621 of the test spring 62 to be electrically connected to the circuit board 3 through the test line assembly 63 .

[0068] It can be understood that the first end 6301 of the test line assembly 63 in the foregoing text refers to the test spring 632 , and the second end 6302 refers to the end of the test line 631 connected to the circuit board 3 .

[0069] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The testing spring piece 632 includes a bending portion 6321 and a connecting portion 6322 .

[0070] Among them, the bending portion 6321 is fixed on the inner wall of the shell 1 to fix the test spring 631 on the inner wall of the shell 1; the connecting portion 6322 is located on the side of the bending portion 6321 close to the circuit board 3, and is connected to the test line 631 to connect the test spring 631 with the test line 631.

[0071] like Figure 4 As shown, the bent portion 6321 has a contact surface at the bent portion, and the contact surface can be used to abut against the first arm 621 of the test spring 62, and also realize the electrical connection between the test spring 632 and the first arm 621 of the test spring 62. It can be understood that compared with the linear or point-shaped connection structure, the planar connection structure is larger in size and more convenient for connection.

[0072] In some embodiments, one end of the test line 631 may be connected to the connection portion 6322 by riveting. Of course, the test line 631 may also be connected to the connection portion 6322 by other connection methods, such as welding, which is not specifically limited in the embodiments of the present utility model.

[0073] It should be noted that, due to the small size of the circuit breaker, in order to facilitate the assembly of the test spring piece 632, the thickness of the test spring piece 632 is very small. In the embodiment of the present utility model, the thickness of the test spring piece 632 may be 0.3 mm.

[0074] In some embodiments, in order to fix the bent portion 6321 on the inner wall of the housing 1, see Figure 4 The inner wall of the housing 1 has a first column 11 and a first slot 12 .

[0075] Among them, the bending portion 6321 is sleeved on the first column 11 and installed in the first slot 12. In this way, not only the first column 11 is used to realize the sleeve connection of the bending portion 6321, but also the first slot 12 is used to realize the clamping connection of the bending portion 6321, so as to ensure that the bending portion 6321 is firmly fixed on the inner wall of the shell 1 to avoid its movement during the use of the circuit breaker and affect the use of the leakage test function.

[0076] In some embodiments, see Figure 6 and Figure 7 ,in Figure 6 A partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model, wherein the circuit breaker structure corresponds to the circuit breaker being in a normal working state; Figure 7 This is a partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the utility model. The inner wall of the housing 1 has a second column 13 and a second slot 14 .

[0077] Among them, see Figure 4 , the test spring 62 is sleeved on the second cylinder 13, so that the test spring 62 is fixed to the inner wall of the housing 1 by the second cylinder 13; see Figure 6 and Figure 7 The second card slot 14 is located on the side of the second column 13 close to the circuit board 3, and part of the test line 631 is installed in the second card slot 14, so that part of the test line 631 can be fixed by the second card slot 14, thereby limiting the test line 631 and preventing the test line 631 from affecting other components in the circuit breaker.

[0078] In some embodiments, see Figure 6 and Figure 7A receiving space 65 is formed between the test cover 64 and the inner wall of the shell 1, and the first column 11 and the second column 13 are located in the receiving space 65, so that the test spring 62 and the test spring 632 are limited by the test cover 64, preventing the test spring 62 and the test spring 632 from moving and interfering with other components in the circuit breaker, avoiding failure of the test function, and ensuring the stability of the circuit breaker performance.

[0079] In some embodiments, see Figure 8 ,in Figure 8 This is a partial cross-sectional view of an exemplary circuit breaker provided by an embodiment of the present utility model. The test cover plate 64 has a positioning hole 641 and a fixing hole 642 .

[0080] One end of the first column 11 extends into the positioning hole 641 , and one end of the second column 13 extends into the fixing hole 642 , so that the positioning hole 641 and the fixing hole 642 are used to position and fix the first column 11 and the second column 13 respectively.

[0081] In some embodiments, see Figure 8 There is a gap 67 between the second arm 622 of the test spring 62 and the inner wall of the housing 1. The test line 631 passes through the gap 67, so that the test line 631 can be limited by the second arm 622 of the test spring 62, preventing the test line from running around and interfering with other components in the circuit breaker, avoiding failure of the test function, and ensuring the stability of the circuit breaker performance.

[0082] In some embodiments, see Fig. 9 The trip assembly 5 includes a trip device 51 and an actuator 52 .

[0083] Among them, the releaser 51 is connected to the circuit board 3 and is located on the side of the actuator 52 close to the circuit board 3; the first arm 621 of the test spring 62 and a part of the test line assembly 63 are arranged between the actuator 52 and the test cover 64, that is, the test spring 62 and the test spring 632 can be separated from the actuator 52 by the test cover 64.

[0084] When the circuit board 3 obtains the leakage signal, the release 51 is controlled to move to drive the actuator 52 to trip, so as to cut off the circuit and protect people and equipment.

[0085] In a possible example, the test mechanism 6 in the circuit breaker provided by the embodiment of the utility model can be installed and assembled in the following manner: install the test spring 632 in the first slot 12, and install the test line 631 in the second slot 14; install the test spring 62, and use the second arm 622 of the test spring 62 to press the test line 631; support the yoke with one end of the second arm 622 of the test spring 62 away from the first arm 621; press the test button 61 on the first arm 621 of the test spring 62; and cover the test cover 64.

[0086] It should be noted that the "several" and "at least one" mentioned in the present invention refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0087] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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; it can be a direct connection, or it can be indirectly connected 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 the present invention can be understood according to specific circumstances.

[0088] 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 features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0089] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0090] In the description of this specification, the description with reference to the terms "some embodiments", "one embodiment", "some implementations", "illustrative implementations", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are included in at least one embodiment or example of the present invention.

[0091] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circuit breaker, characterized in that: The circuit breaker comprises a housing (1), a mutual inductor (2), a circuit board (3), a main conductor (4), a trip assembly (5) and a testing mechanism (6); The test mechanism (6) comprises a test button (61), a test spring (62), a test line assembly (63) and a test cover (64); the test button (61) is pressably mounted on the housing (1), and one end of the test button (61) located inside the housing (1) is connected to a first arm (621) of the test spring (62); a second arm (622) of the test spring (62) is electrically connected to the main conductor (4), the main conductor (4) passes through the mutual inductor (2), and the mutual inductor (2) is electrically connected to the main conductor (4). The sensor (2) and the main conductor (4) are both electrically connected to the circuit board (3); the first end (6301) of the test line assembly (63) is fixed to the inner wall of the housing (1), and the second end (6302) is electrically connected to the circuit board (3); the test cover plate (64) is arranged between the first arm (621) of the test spring (62) and a part of the test line assembly (63) and the trip assembly (5), and the trip assembly (5) is electrically connected to the circuit board (3); When the test button (61) is in a pressed state, the first arm (621) of the test spring (62) is electrically connected to the first end (6301) of the test line assembly (63), and the trip assembly (5) performs a tripping action; when the test button (61) is in a non-pressed state, the first arm (621) of the test spring (62) is electrically disconnected from the first end (6301) of the test line assembly (63).

2. The circuit breaker according to claim 1, characterized in that: The test line assembly (63) comprises a test line (631) and a test spring (632); The test spring (632) is fixed on the inner wall of the housing (1), and is electrically connected to the first arm (621) of the test spring (62) when the test button (61) is in a pressed state; One end of the test line (631) is connected to the test spring (632), and the other end is connected to the circuit board (3).

3. The circuit breaker according to claim 2, characterized in that: The test spring piece (632) comprises a bending portion (6321) and a connecting portion (6322); The bent portion (6321) is fixed on the inner wall of the shell (1); The connecting portion (6322) is located on a side of the bending portion (6321) close to the circuit board (3), and is connected to the test line (631).

4. The circuit breaker according to claim 3, characterized in that: The inner wall of the housing (1) has a first column (11) and a first slot (12); The bent portion (6321) is sleeved on the first column (11) and installed in the first slot (12).

5. The circuit breaker according to claim 4, characterized in that: The inner wall of the housing (1) has a second column (13) and a second slot (14); The test spring (62) is sleeved on the second cylinder (13); The second card slot (14) is located on a side of the second column (13) close to the circuit board (3), and part of the test line (631) is installed in the second card slot (14).

6. The circuit breaker according to claim 5, characterized in that: An accommodating space (65) is formed between the test cover plate (64) and the inner wall of the housing (1), and the first column (11) and the second column (13) are located in the accommodating space (65).

7. The circuit breaker according to claim 5, characterized in that: The test cover plate (64) has a positioning hole (641) and a fixing hole (642); One end of the first column (11) extends into the positioning hole (641), and one end of the second column (13) extends into the fixing hole (642).

8. The circuit breaker according to claim 2, characterized in that: There is a gap (67) between the second arm (622) of the test spring (62) and the inner wall of the housing (1), and the test line (631) passes through the gap (67).

9. The circuit breaker according to claim 1, characterized in that: The inner wall of the housing (1) has a third slot (66), and the test cover plate (64) is installed in the third slot (66).

10. The circuit breaker according to claim 1, characterized in that The trip assembly (5) comprises a trip device (51) and an actuator (52); The release (51) is connected to the circuit board (3) and is located on a side of the actuator (52) close to the circuit board (3); The first arm (621) of the test spring (62) and part of the test line assembly (63) are arranged between the actuator (52) and the test cover plate (64).

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