Circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses a circuit breaker. According to the circuit breaker provided by the utility model, the first accommodating groove and the second accommodating groove are sequentially arranged along the width direction of the middle cover, the first accommodating groove and the second accommodating groove respectively extend along the length direction of the middle cover, and the first accommodating cavity, the second accommodating cavity and the third accommodating cavity are arranged in the first accommodating groove. An indicating device is arranged in the first accommodating cavity, a release is arranged in the second accommodating cavity, a motor is arranged in the third accommodating cavity, and compared with a scheme of distribution in a shape like a Chinese character'ri 'in the length direction of the circuit breaker, the space of the second accommodating groove is larger, so that the installation space of the circuit board is larger, the circuit board is convenient to install, and the circuit board is convenient to operate and maintain; besides, the indicating device, the release and the motor are all arranged in the first accommodating groove, so that the arrangement positions of the indicating device, the release and the motor are optimized in a limited space, and the compactness of the internal structure of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a circuit breaker. Background Art

[0002] The reclosing circuit breaker includes a circuit breaker body and a middle cover. The middle cover is equipped with an indicator device, a release, an indicator device, a motor, a reclosing mechanism, a manual-automatic switching device and a circuit board. The outer side of the middle cover is buckled with a face cover, and the face cover is provided with two plug-in modules. The two plug-in modules are plug-in connected to the circuit board. One plug-in module is a protection module, which provides protection for the circuit breaker, and the other plug-in module is a control module, which provides parameter setting, electric energy measurement, communication and other functions for the circuit breaker.

[0003] In the prior art, a first cavity for installing a release, a second cavity for installing an indicator device, a third cavity for installing a motor, and a fourth cavity for installing a circuit board are provided in the middle cover. The release, the indicator device, and the motor are arranged above the circuit board along the length direction of the circuit breaker, that is, they are distributed in a "sun" shape in the length direction of the circuit breaker. Although this arrangement reduces the size of the circuit breaker in the height direction, due to the limitation of the size of the circuit breaker in the width direction, the installation space for the circuit board is relatively small, which is inconvenient to install the circuit board, and also limits the size of the circuit board, which is inconvenient to operate and maintain the circuit board. Utility Model Content

[0004] The utility model aims to provide a circuit breaker, which increases the installation space of the circuit board while improving the structural compactness of the circuit breaker, facilitates the installation of the circuit board, and facilitates the operation and maintenance of the circuit board.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A circuit breaker comprises a middle cover, wherein the middle cover is provided with a first accommodating groove and a second accommodating groove in sequence along the width direction, and the first accommodating groove and the second accommodating groove respectively extend along the length direction of the middle cover, a circuit board is provided in the second accommodating groove, a first accommodating cavity, a second accommodating cavity and a third accommodating cavity are provided in the first accommodating groove, the first accommodating cavity and the second accommodating cavity are arranged side by side along the width direction of the middle cover, the third accommodating cavity and the first accommodating cavity are arranged side by side along the length direction of the middle cover, an indicating device is provided in the first accommodating cavity, a tripper is provided in the second accommodating cavity, and a motor is provided in the third accommodating cavity.

[0007] As an optional technical solution of the above-mentioned circuit breaker, the circuit breaker also includes a circuit breaker body, the circuit breaker body includes a current transformer and an operating mechanism, along the length direction of the middle cover, the tripper is arranged on one side of the current transformer, the tripper includes a pull rod, and the pull rod is used to act on the traction rod of the operating mechanism to trip the circuit breaker.

[0008] As an optional technical solution of the above-mentioned circuit breaker, the circuit breaker also includes a face cover, which is buckled on the middle cover, and an installation cavity is recessed at a position on the face cover corresponding to the second accommodating groove, and the installation cavity extends along the length direction of the middle cover. The installation cavity is placed in the second accommodating groove, and a protection module and a control module are arranged in the installation cavity, and the plug-in end of the protection module and the plug-in end of the control module are respectively passed through the bottom of the installation cavity and plugged into the circuit board.

[0009] As an optional technical solution for the above-mentioned circuit breaker, an indication window is also provided on the face cover, and the indication device includes a rotatable indicating member, on which an opening trip mark and a closing mark are provided, and the indicating member can be rotated so that the opening trip mark is displayed in the indication window or the closing mark is displayed in the indication window.

[0010] As an optional technical solution for the above-mentioned circuit breaker, it also includes a cover plate, which is arranged at the opening of the installation cavity, and a sealing groove is provided on the surface cover, and a sealing screw passes through the cover plate and is connected to the sealing groove.

[0011] As an optional technical solution of the above-mentioned circuit breaker, the circuit breaker also includes a circuit breaker body, and the circuit breaker body also includes a handle. A handle avoidance hole is provided on the middle cover on the side of the second accommodating cavity away from the first accommodating cavity, and the handle passes through the handle avoidance hole.

[0012] As an optional technical solution for the above-mentioned circuit breaker, the circuit breaker also includes a reclosing mechanism, the reclosing mechanism includes a cam and a transmission unit, the transmission unit is connected to the handle, the cam is connected to the output shaft of the motor, a sleeve is provided at the eccentric position of the cam, the sleeve is connected to the transmission unit, the motor is used to drive the cam to rotate, the sleeve drives the transmission unit to move, and the handle moves with the transmission unit to achieve closing, opening or re-locking.

[0013] As an alternative technical solution of the above circuit breaker, the transmission unit includes a first transmission member and a second transmission member. The first transmission member is fixedly arranged in the first accommodation groove. The second transmission member is slidably connected to the side of the first transmission member facing the inside of the first accommodation groove. Along the length direction of the middle cover, the handle is connected to one end of the second transmission member, and a lever for resetting the release is provided at one end of the second transmission member. A track groove is provided at the other end of the second transmission member, and the bushing is slidably arranged in the track groove.

[0014] As an alternative technical solution of the above circuit breaker, the track groove includes a first groove and a second groove in a rectangular shape. The first groove and the second groove are arranged along the length direction of the middle cover, and one corner of the first groove communicates with one corner of the second groove. The transverse groove wall where the first groove is connected to the second groove is the closing side wall, and the transverse side wall where the second groove is connected to the first groove is the opening side wall. The bushing can slide along the groove walls of the first groove and the second groove, and when the bushing slides to the closing side wall, closing is achieved; when the bushing slides to the opening side wall, opening or reclosing is achieved.

[0015] As an alternative technical solution of the above circuit breaker, the circuit breaker further includes a manual-automatic device arranged on the transmission unit. The manual-automatic device includes a microswitch and a dial block. The dial block is used to be toggled to trigger the microswitch to cut off the power supply of the motor, or not to trigger the microswitch to supply power to the motor.

[0016] Advantages of the present utility model:

[0017] For the circuit breaker provided by the present utility model, a first accommodation groove and a second accommodation groove are sequentially arranged along the width direction of the middle cover, and the first accommodation groove and the second accommodation groove respectively extend along the length direction of the middle cover. A first accommodation cavity, a second accommodation cavity and a third accommodation cavity are arranged in the first accommodation groove. An indicating device is arranged in the first accommodation cavity, a release is arranged in the second accommodation cavity, and a motor is arranged in the third accommodation cavity. Compared with the scheme of being distributed in a "day" shape along the length direction of the circuit breaker, the space of the second accommodation groove is larger, and thus the installation space for the circuit board is larger, which is convenient for installing the circuit board and facilitating the operation, maintenance and repair of the circuit board. In addition, the indicating device, the release and the motor are all arranged in the first accommodation groove, and the indicating device and the release are arranged side by side in the width direction of the middle cover, and the indicating device and the motor are arranged side by side in the length direction of the middle cover. The arrangement positions of the three are optimized in the limited space, improving the compactness of the internal structure of the circuit breaker. Description of the drawings

[0018] Figure 1 is an exploded structural schematic diagram of the overall circuit breaker provided by the embodiment of the present utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the middle cover provided by an embodiment of the utility model;

[0020] Figure 3 It is a structural schematic diagram of a circuit breaker body provided by an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of a release provided by an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the exploded structure of the motor and the reclosing mechanism provided in the embodiment of the utility model;

[0023] Figure 6 is a structural schematic diagram of a second transmission member provided in an embodiment of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the manual automatic device and the cover provided by the embodiment of the utility model;

[0025] Figure 8 It is a structural schematic diagram of the face cover and the indicating device provided in the embodiment of the utility model;

[0026] Fig. 9 It is a schematic diagram of the exploded structure of the middle cover, the surface cover, the protection module, the control module and the cover plate provided in an embodiment of the utility model.

[0027] In the figure:

[0028] 1. Middle cover; 2. Circuit board; 3. Indicator; 4. Trip device; 5. Motor; 6. Circuit breaker body; 7. Surface cover; 8. Cover plate; 9. Reclosing mechanism; 10. Manual automatic device;

[0029] 11. First accommodating groove; 12. Second accommodating groove; 13. First accommodating cavity; 14. Second accommodating cavity; 15. Third accommodating cavity; 16. Handle avoidance hole;

[0030] 31. Indicator;

[0031] 41. Pull rod;

[0032] 61. Current transformer; 62. Operating mechanism; 63. Handle; 64. Static contact system; 65. Arc extinguishing system; 66. Dynamic conductive system; 67. Zero sequence transformer; 68. Base;

[0033] 71. Installation cavity; 72. Protection module; 73. Control module; 74. Indication window; 75. Seal groove; 76. Seal screw; 77. Manual automatic window;

[0034] 91. Cam; 92. Transmission unit; 921. First transmission member; 922. Second transmission member; 923. Push rod; 924. Track groove; 9241. First groove; 9242. Second groove; 9243. Closing side wall; 9244. Opening side wall; 93. Bushing;

[0035] 101. micro switch; 102. dial block;

[0036] a. Length direction; b. Width direction; c. Height direction. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 the present invention can be understood according to specific circumstances.

[0039] 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.

[0040] like Figure 1 and Figure 2As shown in the figure, this embodiment provides a circuit breaker, which includes a middle cover 1. Along the width direction b of the middle cover 1, a first accommodation groove 11 and a second accommodation groove 12 are sequentially provided, and the first accommodation groove 11 and the second accommodation groove 12 respectively extend along the length direction a of the middle cover 1. A circuit board 2 is provided in the second accommodation groove 12. A first accommodation cavity 13, a second accommodation cavity 14 and a third accommodation cavity 15 are provided in the first accommodation groove 11. The first accommodation cavity 13 and the second accommodation cavity 14 are arranged side by side along the width direction b of the middle cover 1, and the third accommodation cavity 15 and the first accommodation cavity 13 are arranged side by side along the length direction a of the middle cover 1. An indicating device 3 is provided in the first accommodation cavity 13, a trip device 4 is provided in the second accommodation cavity 14, and a motor 5 is provided in the third accommodation cavity 15. In this embodiment, the trip device 4 in the second accommodation cavity 14 is a magnetic flux trip device; in other embodiments, the trip device 4 in the second accommodation cavity 14 can also be an under-voltage trip device or a shunt trip device.

[0041] Along the width direction b of the middle cover 1, a first accommodation groove 11 and a second accommodation groove 12 are sequentially provided, and the first accommodation groove 11 and the second accommodation groove 12 respectively extend along the length direction a of the middle cover 1. A first accommodation cavity 13, a second accommodation cavity 14 and a third accommodation cavity 15 are provided in the first accommodation groove 11. An indicating device 3 is provided in the first accommodation cavity 13, a trip device 4 is provided in the second accommodation cavity 14, and a motor 5 is provided in the third accommodation cavity 15. Compared with the scheme of arranging in a "day" shape along the length direction a of the circuit breaker, the space of the second accommodation groove 12 is larger, and thus the installation space for the circuit board 2 is larger, which is convenient for installing the circuit board 2 and facilitating the operation, maintenance and repair of the circuit board 2; in addition, the indicating device 3, the trip device 4 and the motor 5 are all arranged in the first accommodation groove 11, and the indicating device 3 and the trip device 4 are arranged side by side along the width direction b of the middle cover 1, and the indicating device 3 and the motor 5 are arranged side by side along the length direction a of the middle cover 1. The arrangement positions of the three are optimized in the limited space, improving the compactness of the internal structure of the circuit breaker.

[0042] As Figure 3 shown in the figure, the circuit breaker further includes a circuit breaker body 6, which includes a static contact system 64, an arc extinguishing system 65, a moving conductive system 66, an operating mechanism 62, a handle 63, a current transformer 61, a zero-sequence current transformer 67 and a base 68. The static contact system 64, the arc extinguishing system 65, the moving conductive system 66, the operating mechanism 62, the handle 63, the current transformer 61 and the zero-sequence current transformer 67 are all arranged in the base 68, and the middle cover 1 is covered on the base 68. The operating handle 63 can make the moving conductive system 66 and the static contact system 64 attract through the operating mechanism 62, thereby realizing the closing of the circuit breaker, or make the moving conductive system 66 and the static contact system 64 separate, thereby realizing the opening of the circuit breaker. The current transformer 61 and the zero-sequence current transformer 67 play a role in protecting the circuit breaker. The current transformer 61 and the zero-sequence current transformer 67 are respectively electrically connected to the circuit board 2.

[0043] Combination Figure 2 , Figure 3 and Figure 4 As shown, along the length direction a of the middle cover 1, the tripper 4 is arranged on one side of the current transformer 61, and the tripper 4 includes a pull rod 41, and the pull rod 41 acts on the traction rod of the operating mechanism 62 to trip the circuit breaker. The position where the tripper 4 is arranged facilitates the pull rod 41 to act on the traction rod of the operating mechanism 62, thereby improving the compactness of the current transformer 61 and the operating mechanism 62 of the circuit breaker body 6, and also improving the compactness of the structure arranged between the tripper 4 and the operating mechanism 62.

[0044] A handle avoidance hole 16 is provided on the middle cover 1 at the side of the second accommodating chamber 14 away from the first accommodating chamber 13, and the handle 63 passes through the handle avoidance hole 16. The handle 63 is placed on one side of the second accommodating chamber 14, and the handle 63 is connected to the operating mechanism 62. The pull rod 41 of the release 4 placed in the second accommodating chamber 14 can act on the traction rod of the operating mechanism 62, so the above-mentioned setting position improves the compactness of the setting of the handle 63, the operating mechanism 62 and the release 4.

[0045] like Figure 5 As shown, the circuit breaker also includes a reclosing mechanism 9, which includes a cam 91 and a transmission unit 92, the transmission unit 92 is connected to the handle 63, the cam 91 is connected to the output shaft of the motor 5, a sleeve 93 is provided at the eccentric position of the cam 91, the sleeve 93 is connected to the transmission unit 92, the motor 5 is used to drive the cam 91 to rotate, the sleeve 93 drives the transmission unit 92 to move, and the handle 63 moves with the transmission unit 92 to achieve closing, opening or re-locking. The reclosing mechanism 9 can realize automatic closing, opening and re-locking of the circuit breaker.

[0046] Optionally, the transmission unit 92 includes a first transmission member 921 and a second transmission member 922, wherein the first transmission member 921 is fixedly disposed in the first receiving groove 11, and the second transmission member 922 is slidably connected to the first transmission member 921 on one side facing the first receiving groove 11, and along the length direction a of the middle cover 1, the handle 63 is connected to one end of the second transmission member 922, and one end of the second transmission member 922 is provided with a lever 923 for resetting the releaser 4, and the other end of the second transmission member 922 is provided with a track groove 924, and the shaft sleeve 93 is slidably disposed in the track groove 924. The motor 5 drives the cam 91 to rotate, and the shaft sleeve 93 rotates with the cam 91, and the shaft sleeve 93 is limited in the track groove 924. The rotation of the shaft sleeve 93 can drive the second transmission member 922 to slide relative to the first transmission member 921, thereby driving the handle 63 to move, so that the circuit breaker is in a closed, open or re-released state. In addition, the handle 63 is connected to one end of the second transmission member 922, and the other end of the second transmission member 922 is provided with a track groove 924. The second transmission member 922 extends along the length direction a of the middle cover 1, and the second transmission member 922 is slidingly connected with the first transmission member 921 along the length direction a of the middle cover 1 to fully utilize the space in the first accommodating groove 11, and the second transmission member 922 has a large movable space, which improves the stability of the circuit breaker opening and closing.

[0047] The track groove 924 limits the sliding track of the shaft sleeve 93, thereby enabling the sliding of the second transmission member 922. Figure 6 As shown, the track groove 924 includes a first groove 9241 and a second groove 9242 in a rectangular shape. The first groove 9241 and the second groove 9242 are arranged along the length direction a of the middle cover 1, and one corner of the first groove 9241 is connected to one corner of the second groove 9242. The sleeve 93 can slide along the groove wall of the first groove 9241 and the second groove 9242. The transverse groove wall connecting the first groove 9241 and the second groove 9242 is the closing side wall 9243. When the sleeve 93 slides and fits the closing side wall 9243, the circuit breaker is closed. The transverse side wall connecting the second groove 9242 and the first groove 9241 is the opening side wall 9244. When the sleeve 93 slides and fits the opening side wall 9244, the circuit breaker is opened or re-locked. The groove wall of the first groove 9241 and the groove wall of the second groove 9242 between the opening side wall 9244 and the closing side wall 9243 is a transition section when the opening and closing are switched.

[0048] Furthermore, the corners where the first groove 9241 and the second groove 9242 face each other are rounded, and the corners where the second groove 9242 and the first groove 9241 face each other are rounded, so as to ensure smooth sliding of the sleeve 93 in the first groove 9241 and the second groove 9242 .

[0049] like Figure 7As shown, the circuit breaker also includes a manual automatic device 10 disposed on the transmission unit 92, and the manual automatic device 10 includes a micro switch 101 and a dial block 102. The dial block 102 is used to be dialed to trigger the micro switch 101 to cut off the power supply of the motor 5, or not to trigger the micro switch 101 to supply power to the motor 5. When the dial block 102 triggers the micro switch 101, the power supply of the motor 5 is cut off, the motor 5 cannot drive the cam 91 to rotate, and then cannot drive the transmission unit 92 to operate, the circuit breaker cannot automatically close or open, and the circuit breaker can only be manually operated. When the dial block 102 does not trigger the micro switch 101, the motor 5 is powered, the motor 5 can drive the cam 91 to rotate, and then can drive the transmission unit 92 to operate, and the circuit breaker can automatically close or open.

[0050] A surface cover 7 is buckled on the middle cover 1, and a manual window 77 is provided on the surface cover 7. The shifting block 102 of the manual automatic device 10 is placed in the manual window 77 for user operation.

[0051] like Figure 8 As shown, the cover 7 is also provided with an indication window 74, and the indication device 3 includes a rotatable indicating member 31, on which an opening tripping mark and a closing mark are provided, and the indicating member 31 can be rotated to display the opening tripping mark in the indicating window 74 or to display the closing mark in the indicating window 74, so that the user can understand the working state of the circuit breaker. Optionally, the opening tripping mark and the closing mark can be blocks of different colors, for example, the opening tripping mark is a red block, and the closing mark is a green block.

[0052] like Fig. 9 As shown, the cover 7 is buckled on the middle cover 1, and a mounting cavity 71 is recessed at a position on the cover 7 corresponding to the second receiving groove 12. The mounting cavity 71 extends along the length direction a of the middle cover 1, and the mounting cavity 71 is placed in the second receiving groove 12. A protection module 72 and a control module 73 are arranged in the mounting cavity 71, so that the internal structure of the circuit breaker is more compact and the layout is reasonable, which reduces the size of the circuit breaker in the height direction c, and facilitates the installation of the circuit breaker in a narrow space. The size of the mounting cavity 71 matches the size of the second receiving groove 12, and the space for installing the protection module 72 and the control module 73 is large enough to facilitate the installation and removal of the protection module 72 and the control module 73. The plug-in end of the protection module 72 and the plug-in end of the control module 73 are respectively inserted through the bottom of the mounting cavity 71 and plugged into the circuit board 2, which is convenient for the operation and maintenance of the protection module 72 and the control module 73, and there is no need to add wires to connect the protection module 72 and the control module 73 to the circuit board 2.

[0053] The circuit breaker further includes a cover plate 8, which is arranged at the opening of the installation cavity 71. The surface cover 7 is provided with a sealing groove 75, and a sealing screw 76 passes through the cover plate 8 and is connected to the sealing groove 75. The cover plate 8 is arranged to seal the protection module 72 and the control module 73 in the installation cavity 71 to prevent the protection module 72 and the control module 73 from being damaged or disassembled.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker, characterized in that The invention comprises a middle cover (1), wherein the middle cover (1) is provided with a first accommodating groove (11) and a second accommodating groove (12) in sequence along a width direction (b), and the first accommodating groove (11) and the second accommodating groove (12) respectively extend along a length direction (a) of the middle cover (1), a circuit board (2) is provided in the second accommodating groove (12), a first accommodating cavity (13), a second accommodating cavity (14) and a third accommodating cavity (15) are provided in the first accommodating groove (11), the first accommodating cavity (13) and the second accommodating cavity (14) are arranged in parallel along the width direction (b) of the middle cover (1), the third accommodating cavity (15) and the first accommodating cavity (13) are arranged in parallel along the length direction (a) of the middle cover (1), an indicating device (3) is provided in the first accommodating cavity (13), a releaser (4) is provided in the second accommodating cavity (14), and a motor (5) is provided in the third accommodating cavity (15).

2. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes a circuit breaker body (6), the circuit breaker body (6) includes a current transformer (61) and an operating mechanism (62), along the length direction (a) of the middle cover (1), the tripper (4) is arranged on one side of the current transformer (61), the tripper (4) includes a pull rod (41), and the pull rod (41) is used to act on the pull rod of the operating mechanism (62) to trip the circuit breaker.

3. The circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises a face cover (7), the face cover (7) being buckled onto the middle cover (1), a mounting cavity (71) being recessed at a position on the face cover (7) corresponding to the second receiving groove (12), the mounting cavity (71) extending along a length direction (a) of the middle cover (1), the mounting cavity (71) being disposed in the second receiving groove (12), a protection module (72) and a control module (73) being disposed in the mounting cavity (71), and a plug-in end of the protection module (72) and a plug-in end of the control module (73) respectively passing through the cavity bottom of the mounting cavity (71) to be plugged into the circuit board (2).

4. The circuit breaker according to claim 3, characterized in that: The cover (7) is also provided with an indication window (74), and the indication device (3) comprises a rotatably arranged indication member (31), the indication member (31) being provided with an opening tripping mark and a closing mark, and the indication member (31) can be rotated so that the opening tripping mark is displayed in the indication window (74) or the closing mark is displayed in the indication window (74).

5. The circuit breaker according to claim 3, characterized in that: It also includes a cover plate (8), the cover plate (8) is arranged to cover the opening of the installation cavity (71), a sealing groove (75) is provided on the surface cover (7), and a sealing screw (76) passes through the cover plate (8) and is connected to the sealing groove (75).

6. The circuit breaker according to any one of claims 1 to 5, characterized in that: The circuit breaker further comprises a circuit breaker body (6), the circuit breaker body (6) further comprising a handle (63), a handle avoidance hole (16) being provided on the middle cover (1) on the side of the second accommodating cavity (14) facing away from the first accommodating cavity (13), and the handle (63) passing through the handle avoidance hole (16).

7. The circuit breaker according to claim 6, characterized in that: The circuit breaker further comprises a reclosing mechanism (9), the reclosing mechanism (9) comprising a cam (91) and a transmission unit (92), the transmission unit (92) being connected to the handle (63), the cam (91) being connected to the output shaft of the motor (5), a shaft sleeve (93) being provided at an eccentric position of the cam (91), the shaft sleeve (93) being connected to the transmission unit (92), the motor (5) being used for driving the cam (91) to rotate, the shaft sleeve (93) driving the transmission unit (92) to move, and the handle (63) moving with the transmission unit (92) to achieve closing, opening or re-locking.

8. The circuit breaker according to claim 7, characterized in that: The transmission unit (92) comprises a first transmission member (921) and a second transmission member (922), wherein the first transmission member (921) is fixedly arranged in the first receiving groove (11), and the second transmission member (922) is slidably connected to the first transmission member (921) toward one side in the first receiving groove (11), and along the length direction (a) of the middle cover (1), the handle (63) is connected to one end of the second transmission member (922), and one end of the second transmission member (922) is provided with a lever (923) for resetting the releaser (4), and the other end of the second transmission member (922) is provided with a track groove (924), and the shaft sleeve (93) is slidably arranged in the track groove (924).

9. The circuit breaker according to claim 8, characterized in that The track groove (924) comprises a first groove (9241) and a second groove (9242) in a rectangular shape, wherein the first groove (9241) and the second groove (9242) are arranged along the length direction (a) of the middle cover (1), and one corner of the first groove (9241) is connected to one corner of the second groove (9242), the transverse groove wall connecting the first groove (9241) and the second groove (9242) is a closing side wall (9243), and the transverse side wall connecting the second groove (9242) and the first groove (9241) is a closing side wall (9244), and the shaft sleeve (93) can slide along the groove walls of the first groove (9241) and the second groove (9242), and the shaft sleeve (93) slides to the closing side wall (9243) to achieve closing, and the shaft sleeve (93) slides to the closing side wall (9244) to achieve opening or re-locking.

10. The circuit breaker according to claim 7, characterized in that: The circuit breaker further comprises a manual automatic device (10) arranged on the transmission unit (92), the manual automatic device (10) comprising a micro switch (101) and a dial block (102), the dial block (102) being used to be dialed to trigger the micro switch (101) to cut off the power supply of the motor (5), or not to trigger the micro switch (101) to supply power to the motor (5).

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