CN217061955U

CN217061955U - Circuit breaker

Info

Publication number: CN217061955U
Application number: CN202122176867.0U
Authority: CN
Inventors: 张兰晶; 熊周督; 繆作华
Original assignee: Shenzhen Mailian Electronics Co ltd
Current assignee: Guangdong Mailian Intelligent Electrical Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-07-26
Anticipated expiration: 2031-09-09

Abstract

The utility model discloses a circuit breaker. The circuit breaker includes a housing; the first wiring assembly comprises a first interface and a first wiring board electrically connected with the first interface; a second wiring assembly disposed within the housing, the second wiring assembly including a second interface, and a second wiring board and a third wiring board electrically connected to the second interface; the first wiring board, the second wiring board, or the third wiring board is electrically connected to the wiring board. The utility model provides a circuit breaker is through setting up the circuit board in the casing to set up electronic component such as electric energy metering unit and MCU on the circuit board, realize the intelligent meticulous control to the circuit breaker, and compact structure is simple.

Description

Circuit breaker

Technical Field

The utility model relates to a distributor technical field especially relates to a circuit breaker.

Background

In the related art, when 5G communication equipment and a data center are used, requirements on size, replaceability and intellectualization are required. The existing branch distribution unit adopts a large circuit board, multiple paths (such as 10 paths or 15 paths) of control metering units are distributed on the large circuit board, if one path of control metering unit has problems, the whole circuit board needs to be replaced, and due to the fact that the size of the branch distribution unit is large, replacement operation on site is difficult. The on-off of the existing pluggable circuit breaker basically realizes the on-off of a short circuit by driving a contact and a handle to move through a mechanism, when a circuit fails, the mechanism drives the contact to open a cut-off circuit under the pushing of a release or a thermal release, and the handle is changed from a switch-on position to a switch-off position.

In addition, the existing circuit breaker product does not have functions of metering, monitoring, controlling, communicating (namely a data uploading platform) and the like on a circuit because the open-close current is realized in a mechanical mode, and also has functions of metering, counting, real-time monitoring, event recording, timing on-off control, standby power management, local or remote communication, power-off according to time length, voltage and electric quantity, on-off in duty-free time period and the like on voltage, current, electric quantity, power and electric leakage.

In some application scenarios, for example, in power distribution of an iron tower base station or a data center, a direct current breaker is generally adopted as overcurrent or short circuit protection, and a contactor is adopted as on-off control.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the problems that exist among the current correlation technique at least to a certain extent, for this reason, the utility model provides a circuit breaker can realize compact structure and simple to the intelligent fine control of circuit breaker.

The above purpose is realized by the following technical scheme:

a circuit breaker, comprising:

a housing;

a circuit board disposed within the housing;

a first wiring assembly disposed within the housing, the first wiring assembly including a first interface and a first wiring board electrically connected to the first interface;

a second wiring assembly disposed within the housing, the second wiring assembly including a second interface, and a second wiring board and a third wiring board electrically connected to the second interface;

the first wiring board, the second wiring board, or the third wiring board is electrically connected to the wiring board.

Optionally, the first interface is disposed at a first end of the housing, a first end of the first wiring board is electrically connected to the first interface, a second end of the first wiring board is electrically connected to a first load interface of the circuit breaker, and the first wiring board is disposed at one side of the circuit board;

the second interface sets up the first end of casing and with first interface is relative and the interval sets up, the first end of second wiring board with the second interface electricity is connected, the second end with the circuit board electricity is connected, third wiring board first end with the circuit board electricity is connected, the second end with the second load interface electricity of circuit breaker is connected, the second wiring board with three wiring boards all set up the opposite side of circuit board.

Optionally, the casing includes casing and lower casing, go up the casing with synthetic cavity is enclosed to the casing down, the circuit board first wiring subassembly and second wiring subassembly all sets up in the cavity, the first end of casing down be provided with first spacing frame and with the relative spacing frame of second that just the interval set up of first spacing frame, the first end of going up the casing is provided with the spacing frame of third and the spacing frame of fourth, first spacing frame with the spacing frame of third corresponds the setting and encloses and close and form first spacing chamber of formation, the spacing frame of second with the spacing frame of fourth corresponds the setting and encloses and close and form the spacing chamber of second, first interface sets up first spacing intracavity, the second interface sets up the spacing intracavity of second.

Optionally, the terminal device further comprises a first elastic terminal and a second elastic terminal, the first elastic terminal is arranged between the first load interface and the second end of the first wiring board, the second end of the first wiring board abuts against the side face of the first elastic terminal, the second elastic terminal is arranged between the second load interface and the second end of the third wiring board, and the second end of the third wiring board abuts against the side face of the second elastic terminal.

Optionally, the housing comprises an upper housing and a lower housing, the upper housing and the lower housing enclose a cavity, the circuit board, the first wiring assembly and the second wiring assembly are all arranged in the cavity, a fifth limiting frame body and a sixth limiting frame body which is opposite to the fifth limiting frame body and is arranged at intervals are arranged at the second end of the lower shell, a seventh limiting frame body and an eighth limiting frame body which is opposite to the seventh limiting frame body and is arranged at intervals are arranged at the second end of the upper shell, the fifth limiting frame body and the seventh limiting frame body are correspondingly arranged and form a third limiting cavity in an enclosing manner, the sixth limiting frame body and the eighth limiting frame body are correspondingly arranged and enclose to form a fourth limiting cavity, the first elastic terminal is arranged in the third limiting cavity, and the second elastic terminal is arranged in the fourth limiting cavity.

Optionally, an electric energy metering unit is arranged on the circuit board and used for calculating electric quantity.

Optionally, a communication unit is further disposed on the circuit board, and the communication unit is configured to upload information of the circuit board to a terminal platform and receive a signal sent by the terminal platform.

Optionally, the communication unit includes a communication interface, the communication interface is disposed at the first end of the housing and located between the first interface and the second interface, and the communication interface is electrically connected to the circuit board.

Optionally, the casing includes casing and lower casing, go up the casing with synthetic cavity is enclosed to the casing down, the circuit board first wiring subassembly and second wiring subassembly all sets up in the cavity, the first end of casing is provided with the spacing framework of ninth down, the first end of going up the casing is provided with the spacing framework of tenth, the spacing framework of ninth with the spacing framework of tenth corresponds the setting and encloses synthetic fifth spacing chamber, communication interface sets up the spacing intracavity of fifth.

Optionally, the communication unit is RS485 or CAN.

Optionally, an overcurrent and short-circuit protection unit is further disposed on the circuit board, and the overcurrent and short-circuit protection unit is configured to close a main switch of the circuit breaker when the circuit breaker is in an overcurrent or short-circuit state.

Optionally, a power module is further disposed on the circuit board.

Optionally, the power module adopts a BUCK-type DC-DC circuit to drive the circuit board to operate.

Optionally, the circuit board includes a main board and a power board, the power module is disposed on the power board, and the main board is provided with a communication unit, an electric energy metering unit, a short-circuit protection unit and an MCU.

Optionally, the main board is disposed at a bottom side of the housing, and the power board is disposed at an upper side of the main board and parallel to the main board.

Optionally, the master switch of circuit breaker is the MOS switch, still includes the position detection structure, the position detection structure sets up and stretches out in the casing for detect whether the circuit breaker is installed and is targetting in place, when before the circuit breaker is installed and targetting in place, the MOS switch is closed, works as after the circuit breaker is installed and targetting in place, the MOS switch is opened.

Optionally, the position detection structure comprises:

a microswitch;

the moving piece is arranged in the shell and can move towards a position close to the middle of the shell relative to the shell under the action of external force so as to be abutted against the microswitch, so that the microswitch is switched off, and the circuit breaker is switched off at the moment;

the elastic piece is arranged between the moving piece and the shell, when the moving piece moves towards the middle position close to the shell, the elastic piece is compressed, when the external force on the moving piece is removed, the moving piece can move towards the direction close to the edge of the shell under the action of the elastic force of the elastic piece so as to be separated from the microswitch to enable the microswitch to be closed, and at the moment, the circuit breaker is electrified.

Optionally, the circuit breaker further comprises a heat dissipation structure, wherein the heat dissipation structure is arranged on the shell and used for dissipating heat of the circuit breaker.

Compared with the prior art, the utility model discloses at least, including following beneficial effect:

the utility model provides a circuit breaker is through setting up the circuit board in the casing to set up electronic component such as electric energy metering unit and MCU on the circuit board, realize the intelligent meticulous control to the circuit breaker, and compact structure is simple.

Drawings

Fig. 1 is a schematic perspective view of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a front view of a three-dimensional structure of the circuit breaker provided by the embodiment of the present invention after the upper case is removed;

fig. 3 is a schematic perspective view of the circuit breaker according to the embodiment of the present invention after the upper case is removed;

FIG. 4 is an enlarged view at A in FIG. 3;

fig. 5 is a schematic perspective view of an upper case of a circuit breaker according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a control principle of the circuit breaker according to an embodiment of the present invention.

In the figure:

1. a housing; 11. a lower housing; 12. an upper housing; 1201. a third limit frame; 1202. a fourth limit frame; 1203. a tenth limiting frame body; 121. a guide bar; 122. a seventh limiting frame body; 123. an eighth limiting frame body; 13. a heat sink; 131. a window; 14. raised grains;

20. a first limit frame; 21. a first interface; 22. a first patch panel;

30. a second limit frame; 31. a second interface; 32. a second wiring board; 33. a third wiring board;

4. a circuit board; 41. a power panel; 42. a main board;

51. a first elastic terminal; 511. a fifth limiting frame body; 52. a second elastic terminal; 522. a sixth limiting frame body;

61. a communication interface; 62. a ninth limit frame body;

71. a moving member; 711. a guide groove; 72. an action block; 721. a bevel; 73. an elastic member;

8. a microswitch;

9. pressing a key;

10. an indicator; 100. a light guide pillar; 200. a first load interface; 201. a second load interface.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, the technical features can be modified or replaced by other parts without departing from the spirit of the present invention, which is covered by the scope of the technical solution of the present invention.

Referring to fig. 1-6, the present invention provides a power distribution structure, which includes a circuit breaker and a plurality of power distribution circuits, wherein each power distribution circuit is provided with a circuit breaker. The circuit breaker includes a housing 1, a circuit board 4, a first wiring assembly and a second wiring assembly. The wiring board 4 is provided in the housing 1. The first wiring block 2 is disposed in the housing 1, and the first wiring block 2 includes a first interface 21 and a first wiring board 22 electrically connected to the first interface 21. The second wiring member 3 is provided in the housing 1, the second wiring member 3 includes a second interface 31, and a second wiring board 32 and a third wiring board 33 electrically connected to the second interface 31, and the first wiring board 22, the second wiring board 32, or the third wiring board 33 is electrically connected to the wiring board 4.

Alternatively, the first interface 21 is electrically connected to the positive pole of the distribution bar of the power distributor and the second interface 31 is electrically connected to the negative pole of the distribution bar of the power distributor.

The first port 21 is provided at a first end of the housing 1, a first end of a first terminal plate 22 is electrically connected to the first port 21, a second end is electrically connected to a first load port 200 of the circuit breaker, and the first terminal plate 22 is provided on a side of the wiring board 4. The second interface 31 is arranged at the first end of the shell 1, opposite to the first interface 21 and spaced from the first interface, the first end of the second wiring board 32 is electrically connected with the second interface 31, the second end is electrically connected with the circuit board 4, the first end of the third wiring board 33 is electrically connected with the wiring board, the second end is electrically connected with the second load interface 201 of the circuit breaker, and the second wiring board 32 is electrically connected with the circuit board 4 and arranged at the other side of the circuit board 4.

Specifically, in the present embodiment, the first interface 21 is soldered to the first wiring board 22 to achieve electrical connection between the first interface 21 and the first wiring board 22. The second interface 31 is soldered to the second wiring board 32 to achieve electrical connection between the second interface 31 and the second wiring board 32. The second wiring board 32 is soldered to the wiring board 4 to achieve electrical connection between the second wiring board 32 and the wiring board 4. The third wiring board 33 is soldered to the wiring board 4 to achieve electrical connection between the third wiring board 33 and the wiring board 4. Therefore, the assembling process of the circuit breaker is simplified, the preparation cost is reduced, and the structure is further simplified.

Optionally, the housing 1 includes an upper housing 12 and a lower housing 11, the upper housing 12 and the lower housing 11 enclose a synthetic cavity, the circuit board 4, the first wiring assembly 2 and the second wiring assembly 3 are all disposed in the cavity, the first end of the lower housing 11 is provided with a first limiting frame 20 and a second limiting frame 30 opposite to the first limiting frame 20 and disposed at an interval, the first end of the upper housing 12 is provided with a third limiting frame 1201 and a fourth limiting frame 1202, the first limiting frame 20 and the third limiting frame 1201 are correspondingly disposed and enclose to form a first limiting cavity, the second limiting frame 30 and the fourth limiting frame 1202 are correspondingly disposed and enclose to form a second limiting cavity, the first interface 21 is disposed in the first limiting cavity, and the second interface 31 is disposed in the second limiting cavity, so as to implement the installation of the first interface 21 and the second interface 31 in the housing 1.

Optionally, a first elastic terminal 51 and a second elastic terminal 52 are further included, the first elastic terminal 51 is disposed between the first load interface 200 and the second end of the first wiring board 22, and the second end of the first wiring board 22 abuts against the side of the first elastic terminal 51, so as to mount the first wiring board 22 and the first interface 21 in the housing 1. The second elastic terminal 52 is disposed between the second load port 201 and the second end of the third wiring board 33, and one end of the third wiring board 33 abuts on the side face of the second elastic terminal 52, so that the third wiring board 33 and the second port 31 are mounted in the housing 1.

Optionally, a fifth limiting frame 511 and a sixth limiting frame 522 opposite to the fifth limiting frame 511 and disposed at an interval are disposed at the second end of the lower housing 11, a seventh limiting frame 122 and an eighth limiting frame 123 opposite to the seventh limiting frame 122 and disposed at an interval are disposed at the second end of the upper housing 12, the fifth limiting frame 511 and the seventh limiting frame 122 are disposed correspondingly and enclose a third limiting cavity, the sixth limiting frame 522 and the eighth limiting frame 123 are disposed correspondingly and enclose a fourth limiting cavity, the first elastic terminal 51 is disposed in the third limiting cavity, and the second elastic terminal 52 is disposed in the fourth limiting cavity.

Optionally, an electric energy metering unit is arranged on the circuit board 4, and the electric energy metering unit is used for calculating electric quantity.

The utility model provides a circuit breaker is through setting up electric energy metering unit on circuit board 4 for this circuit breaker has the function of the arbitrary distribution circuit's among the independent calculation distribution structure electric quantity, thereby the user of being convenient for accurately acquires the electric quantity that each independent distribution circuit used. And when the circuit breaker among one of them distribution circuit or many distribution circuit in the distribution structure goes wrong, only need change or maintain the circuit breaker that goes wrong can, and then solved prior art, when the distribution circuit of one of them way goes wrong, only can change the problem of whole distribution structure, effectively the cost is reduced.

Optionally, the electric energy metering unit adopts a chip special for electric energy metering, and high-precision electric energy metering and temperature protection are realized by detecting voltage, current and temperature through a resistor divider, a current divider and a thermistor.

Optionally, the first interface 21 and the second interface 31 are both Y-shaped elastic interfaces.

Optionally, a communication unit is further arranged on the circuit board 4, and the communication unit is used for uploading information of the circuit board 4, such as electric quantity calculated by the metering unit and information for controlling the on-off of the circuit board 4, to a terminal platform, so that a user can look up the information and can also receive signals sent by the platform. For example, the circuit board 4 can control the on/off of a circuit breaker according to a signal sent by the platform. Thereby, the remote control of the circuit breaker is realized.

Optionally, the communication unit comprises a communication interface 61. The communication interface 61 is arranged at the first end of the housing and is located between the first interface 21 and the second interface 31. The communication interface 61 is electrically connected to the wiring board 4.

Optionally, communication interface 61 supports the standard MODBUS protocol.

Optionally, a ninth limiting frame 62 is disposed at the first end of the lower housing 11, a tenth limiting frame 1203 is disposed at the first end of the upper housing 12, the ninth limiting frame 62 and the tenth limiting frame 1203 are disposed correspondingly and enclose a fifth limiting cavity, and the communication interface 61 is disposed in the fifth limiting cavity to implement installation of the communication interface 61 in the housing 1.

Optionally, a ninth limiting frame 62 is disposed in the housing 1, and the communication interface 61 is disposed in the ninth limiting frame 62.

Optionally, the communication unit is RS485 or CAN, and the interface of RS485 and CAN is electrically isolated from the main loop of the circuit board 4, so as to protect electrical safety.

Optionally, an over-current and short-circuit protection unit is further disposed on the circuit board 4, and the short-circuit protection unit is configured to close a main switch of the circuit breaker to protect the circuit breaker when the circuit breaker is subjected to over-current or short-circuit.

Specifically, the overcurrent and short-circuit protection unit comprises a comparator and a shunt, when short-circuit fault occurs, the shunt generates a large-current signal, the comparator quickly acts to turn off a main switch and lock output, and when the overcurrent or short-circuit fault is relieved, short-circuit protection can be automatically relieved through software matched with the circuit breaker.

Optionally, the circuit breaker may further set, through software, actual application requirements such as a user type, a capacity size, a standby power length, an overcurrent (overload) amount, and the like.

Optionally, the main switch of the circuit breaker is a MOS switch.

Specifically, the MOS switch adopts an N-channel MOS switch with high current and low internal resistance, and a plurality of MOS switches are connected in parallel, so that the loss of the switch is reduced to the maximum extent, and the temperature rise is reduced.

Optionally, the circuit breaker further comprises a position detection structure, the position detection structure is arranged in the shell 1 and extends out of the shell 1, the position detection structure is used for detecting whether the circuit breaker is installed in place, the MOS switch is closed before the circuit breaker is installed in place, and the MOS switch is opened after the circuit breaker is installed in place, so that the non-electric operation during the installation of the circuit breaker is achieved, and the safety of operators is guaranteed.

Alternatively, the position detection structure includes the micro switch 8, the moving member 71, and the elastic member 73. The moving piece 71 is arranged in the housing 1 and can move towards the position close to the middle part of the housing 1 relative to the housing 1 under the action of external force so as to abut against the microswitch 8, so that the microswitch 8 is disconnected, and the breaker is powered off at the moment. The elastic member 73 is disposed between the moving member 71 and the housing 1, when the moving member 71 moves toward the middle position near the housing 1, the elastic member 73 is compressed, and when the external force on the moving member 71 is removed, the moving member 71 can move toward the direction near the edge of the housing 1 under the elastic force of the elastic member 73 to disengage from the micro switch 8, so that the micro switch 8 is closed, and the circuit breaker is powered on.

Specifically, the position detection structure further comprises an action block 72, the action block 72 is mounted on the moving part 1, a through hole is further formed in the shell 1, and the action block 72 penetrates through the through hole and extends out of the shell 1. One side of action block 72 is provided with inclined plane 721, and when the circuit breaker was installed to the power distribution structure in, power distribution structure extrusion inclined plane 721 for action block 72 removes towards the direction that is close to casing 1 inside, thereby promotes motion 71 and removes and with micro-gap switch 8 butt towards casing 1 inside, makes micro-gap switch 8 disconnection, the circuit breaker outage.

Optionally, the position detecting structure further includes a guide structure for guiding the mover 71. Specifically, the guide structure includes a guide groove 711 and a guide rod 121, one of the guide groove 711 and the guide rod 121 is provided on the housing 1, and the other of the guide groove 711 and the guide rod 121 is provided on the moving member 71. The guide groove 711 is engaged with the guide bar 121 and moves relatively, thereby achieving a guide effect for the moving member 71 during the movement.

Optionally, the housing 1 includes an upper housing 12 and a lower housing 11, and the circuit board 4, the first wiring assembly, the second wiring assembly, the first spring terminal, the second spring terminal, and the ninth limiting frame 62 are disposed in the lower housing 11. The guide rod 121 of the guide structure is disposed in the upper case 12, and the guide groove 711 is disposed on the moving member 71.

Optionally, a power module is further disposed on the circuit board 4.

Optionally, the power module drives the circuit board 4 to operate by using a BUCK-type DC-DC circuit.

Optionally, the display device further comprises an indicator 10 and a light guide column, wherein the indicator 10 is arranged on the shell 1 and is electrically connected with the circuit board 4 through the light guide column.

Optionally, the device further comprises a key 9, the key 9 is arranged on the housing 1 and used for controlling the opening and closing and the disconnection of the circuit breaker, and address configuration can be performed by pressing the key 9 for a long time.

Optionally, a heat dissipation structure is further disposed on the housing 1, and is used for dissipating heat of the circuit breaker.

Alternatively, the heat dissipation structure includes a heat dissipation groove 13, and the heat dissipation groove 13 is concavely provided on the side surface of the housing 1. A window 131 is opened in the heat sink 13 to facilitate heat dissipation of the circuit breaker.

Optionally, the shell 1 is further provided with a raised grain 14, which plays a role in increasing friction force for fingers of an operator when a product is plugged and pulled out.

Alternatively, the wiring board 4 includes a main board 42 and a power supply board 41. Wherein, the power module is arranged on the power panel 41, and the main board 42 is provided with a communication unit, an electric energy metering unit, an over-current and short-circuit protection unit and an MCU.

Alternatively, the main board 42 is disposed on the bottom side of the housing 1, and the power supply board 41 is disposed on the upper side of the main board 42 and is disposed in parallel with the main board 42.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which all fall within the scope of the invention.

Claims

1. A circuit breaker, comprising:

a housing (1);

a circuit board (4) disposed within the housing (1);

a first wiring assembly (2) disposed within the housing (1), the first wiring assembly (2) including a first interface (21) and a first wiring board (22) electrically connected to the first interface (21);

a second wiring assembly (3) disposed within the housing (1), the second wiring assembly (3) including a second interface (31) and second and third wiring boards (32, 33) electrically connected to the second interface (31);

the first wiring board (22), the second wiring board (32), or a third wiring board (33) is electrically connected to the wiring board (4).

2. The circuit breaker according to claim 1, wherein the first interface (21) is disposed at a first end of the housing (1), a first end of the first terminal block (22) is electrically connected to the first interface (21), a second end is electrically connected to a first load interface (200) of the circuit breaker, and the first terminal block (22) is disposed at a side of the circuit board (4);

second interface (31) set up the first end of casing (1) and with first interface (21) is relative and the interval sets up, the first end of second wiring board (32) with second interface (31) electricity is connected, the second end with circuit board (4) electricity is connected, third wiring board (33) first end with circuit board (4) electricity is connected, the second end with the second load interface (201) electricity of circuit breaker is connected, second wiring board (32) and third wiring board (33) all set up the opposite side of circuit board (4).

3. The circuit breaker according to claim 2, wherein the housing (1) comprises an upper housing (12) and a lower housing (11), the upper housing (12) and the lower housing (11) enclose a cavity, the circuit board (4), the first wiring assembly (2) and the second wiring assembly (3) are disposed in the cavity, a first limiting frame (20) and a second limiting frame (30) opposite to and spaced from the first limiting frame (20) are disposed at a first end of the lower housing (11), a third limiting frame (1201) and a fourth limiting frame (1202) are disposed at a first end of the upper housing (12), the first limiting frame (20) and the third limiting frame (1201) are disposed correspondingly and enclose to form a first limiting cavity, the second limiting frame (30) and the fourth limiting frame (1202) are disposed correspondingly and enclose to form a second limiting cavity, the first port (21) is disposed within the first limiting cavity and the second port (31) is disposed within the second limiting cavity.

4. The circuit breaker according to claim 2, further comprising a first elastic terminal (51) and a second elastic terminal (52), wherein the first elastic terminal (51) is disposed between the first load port (200) and a second end of the first wiring board (22), the second end of the first wiring board (22) abuts against a side surface of the first elastic terminal (51), the second elastic terminal (52) is disposed between a second load port (201) and a second end of the third wiring board (33), and the second end of the third wiring board (33) abuts against a side surface of the second elastic terminal (52).

5. The circuit breaker according to claim 4, wherein the housing (1) comprises an upper housing (12) and a lower housing (11), the upper housing (12) and the lower housing (11) enclose a cavity, the circuit board (4), the first wiring assembly (2) and the second wiring assembly (3) are disposed in the cavity, a fifth limiting frame (511) and a sixth limiting frame (522) opposite to and spaced from the fifth limiting frame (511) are disposed at a second end of the lower housing (11), a seventh limiting frame (122) and an eighth limiting frame (123) opposite to and spaced from the seventh limiting frame (122) are disposed at a second end of the upper housing (12), the fifth limiting frame (511) and the seventh limiting frame (122) are disposed correspondingly and enclose a third limiting cavity, the sixth limiting frame body (522) and the eighth limiting frame body (123) are correspondingly arranged and enclosed to form a fourth limiting cavity, the first elastic terminal (51) is arranged in the third limiting cavity, and the second elastic terminal (52) is arranged in the fourth limiting cavity.

6. The circuit breaker according to claim 2, characterized in that an electric energy metering unit is arranged on the circuit board (4), and the electric energy metering unit is used for calculating electric quantity.

7. The circuit breaker according to claim 6, characterized in that the circuit board (4) is provided with a communication unit for uploading information of the circuit board (4) to a terminal platform and receiving signals sent by the terminal platform.

8. The circuit breaker according to claim 7, characterized in that said communication unit comprises a communication interface (61), said communication interface (61) being arranged at a first end of said housing (1) and being located between said first interface (21) and said second interface (31), said communication interface (61) being electrically connected to said circuit board (4).

9. The circuit breaker according to claim 8, wherein the housing (1) comprises an upper housing (12) and a lower housing (11), the upper housing (12) and the lower housing (11) enclose a cavity, the circuit board (4), the first wiring assembly (2) and the second wiring assembly (3) are disposed in the cavity, a ninth limiting frame (62) is disposed at the first end of the lower housing (11), a tenth limiting frame (1203) is disposed at the first end of the upper housing (12), the ninth limiting frame (62) and the tenth limiting frame (1203) are disposed correspondingly and enclose a fifth limiting cavity, and the communication interface (61) is disposed in the fifth limiting cavity.

10. The circuit breaker of claim 7, wherein the communication unit is RS485 or CAN.

11. The circuit breaker according to claim 1, characterized in that, the circuit board (4) is provided with a short-circuit protection unit, the short-circuit protection unit is used for closing a main switch of the circuit breaker when the circuit breaker generates over-current or short-circuit.

12. The circuit breaker according to claim 1, characterized in that a power module is provided on the circuit board (4).

13. The circuit breaker according to claim 12, wherein the power module adopts a BUCK-type BUCK DC-DC circuit to drive the circuit board (4) to operate.

14. The circuit breaker according to claim 12, characterized in that the circuit board (4) comprises a main board (42) and a power board (41), the power module is arranged on the power board (41), and the main board (42) is provided with a communication unit, an electric energy metering unit, an over-current and short-circuit protection unit and an MCU.

15. The circuit breaker according to claim 14, wherein the main board (42) is disposed on a bottom side of the housing (1), and the power supply board (41) is disposed on an upper side of the main board (42) and is disposed in parallel with the main board (42).

16. The circuit breaker according to claim 1, wherein the main switch of the circuit breaker is an MOS switch, and further comprising a position detecting structure, the position detecting structure is disposed in the housing (1) and extends out of the housing (1) for detecting whether the circuit breaker is installed in place, the MOS switch is turned off before the circuit breaker is installed in place, and the MOS switch is turned on after the circuit breaker is installed in place.

17. The circuit breaker of claim 16, wherein the position sensing structure comprises:

a microswitch (8);

the moving piece (71) is arranged in the shell (1) and can move towards the position close to the middle of the shell (1) relative to the shell (1) under the action of external force so as to be abutted against the microswitch (8) to disconnect the microswitch (8), and at the moment, the circuit breaker is powered off;

elastic component (73), set up motion piece (71) with between casing (1), when motion piece (71) is towards being close to the middle part position of casing (1) moves, elastic component (73) compression, when external force on motion piece (71) is removed, motion piece (71) can be in under the effect of the elastic force of elastic component (73) towards being close to the direction removal of the border of casing (1), in order with micro-gap switch (8) break away from so that micro-gap switch (8) are closed, this moment the circuit breaker circular telegram.

18. The circuit breaker of any one of claims 1-17, further comprising a heat dissipating structure disposed on the housing for dissipating heat from the circuit breaker.