CN112151319B

CN112151319B - Circuit breaker

Info

Publication number: CN112151319B
Application number: CN202010931511.0A
Authority: CN
Inventors: 顾斌斌; 杨安; 卢科军
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2024-08-06
Anticipated expiration: 2040-09-07
Also published as: CN112151319A

Abstract

The invention relates to the field of piezoelectric devices, in particular to a circuit breaker, wherein a shell of the circuit breaker comprises a base, an upper cover, a first partition plate and a second partition plate, and a circuit breaker circuit comprises a circuit breaker wiring board, a button mechanism, an electric operating device, an operating mechanism connected with the button mechanism in a driving way, a contact mechanism, a short-circuit protection mechanism, an overload protection mechanism and an arc extinguishing chamber; the motor of the electric operating device is in driving fit with the operating mechanism through a gear set, and the operating mechanism is in driving connection with the moving contact of the contact mechanism; the button mechanism and the second partition board are arranged at one end of the shell side by side, the circuit breaking pole wiring board is arranged on the second partition board and is positioned between the second partition board and the upper cover, the motor is arranged on the base and is positioned between the base and the second partition board, and the operating mechanism, the contact mechanism, the short circuit protection mechanism, the overload protection mechanism and the arc extinguishing chamber are respectively arranged on the first partition board and are positioned between the first partition board and the upper cover; the circuit breaker disclosed by the invention has reasonable and compact internal layout and good insulativity.

Description

Circuit breaker

Technical Field

The invention relates to the field of piezoelectric devices, in particular to a circuit breaker.

Background

The existing circuit breaker has the following problems:

1. Because the layout of components in the circuit breaker is unreasonable, the specification of the circuit breaker is larger and cannot adapt to the installation requirement of a smaller space;

2. The short-circuit protection mechanism of the existing circuit breaker has large temperature rise and high production cost of the wire assembly;

3. when a large current flows through an overload protection mechanism of the existing circuit breaker, the temperature rise is too large;

4. The installation space of the control circuit board of the existing circuit breaker is insufficient, which is not beneficial to the installation and design of the control circuit board;

5. the existing circuit breaker has no reliable working state detection means.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a circuit breaker which is reasonable and compact in internal layout and good in insulativity.

In order to achieve the above purpose, the invention adopts the following technical scheme:

A circuit breaker includes a housing and a breaker circuit disposed in the housing, respectively; the shell comprises a base 1-1a and an upper cover 1-4a, a circuit breaker circuit comprises a circuit breaker wiring board 2b, a button mechanism 2a, an electric operating device 3a, an operating mechanism 4a, a contact mechanism, a short-circuit protection mechanism 5a, an overload protection mechanism 7a and an arc extinguishing chamber 6a, the electric operating device 3a comprises a motor 3-1a and a gear set 3-2a, and the contact mechanism comprises a movable contact 8-1a and a fixed contact 8-2a which are matched for use; the button mechanism 2a is in driving connection with the operating mechanism 4a, the motor 3-1a is in driving fit with the operating mechanism 4a through the gear set 3-2a, and the operating mechanism 4a is in driving connection with the moving contact 8-1 a; the shell also comprises a first partition board 1-2a and a second partition board 1-3a which are arranged between the base 1-1a and the upper cover 1-4a, the button mechanism 2a and the second partition board 1-3a are arranged at one end of the shell side by side, the circuit breaking pole wiring board 2b is arranged on the second partition board 1-3a and is positioned between the second partition board 1-3a and the upper cover, the motor 3-1a is arranged on the base 1-1a and is positioned between the base 1-1a and the second partition board 1-3a, and the operating mechanism 4a, the contact mechanism, the short circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguishing chamber 6a are respectively arranged on the first partition board 1-2a and are both positioned between the first partition board 1-2a and the upper cover 1-4 a.

Preferably, the circuit breaker further comprises a control circuit board group, the control circuit board group comprises a first control circuit board 5-1b and a second control circuit board 5-2b which are arranged in a stacked mode, the first control circuit board 5-1b is arranged between the first partition board 1-2a and the base 1-1a, the second control circuit board 5-2b is arranged between the motor 3-1a and the upper cover 1-4a, and the gear set 3-2a is arranged between the second control circuit board 5-2b and the upper cover 1-4 a.

Preferably, the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell side by side, the short-circuit protection mechanism 5a and the arc extinguishing chamber 6a are arranged side by side, the button mechanism 2a and the short-circuit protection mechanism 5a are respectively positioned at two sides of the operating mechanism 4a, the second partition board 1-3a and the arc extinguishing chamber 6a are respectively positioned at two sides of the overload protection mechanism 7a, and the gear set 3-2a is positioned between the motor 3-1a and the button mechanism 2 a.

Preferably, the circuit breaker further comprises a through electrode circuit arranged in the shell, the through electrode circuit comprises a through electrode wiring board 1b, one side edge of the through electrode wiring board 1b is in limit fit with the first partition board 1-2a and the second partition board 1-3a respectively, and the other side edge of the through electrode wiring board 1b is in limit fit with the base 1-1 a.

Preferably, the first partition board 1-2a comprises a third limit slot 1-22a, the second partition board 1-3a comprises a second limit slot 1-33a, the base 1-1a comprises a base limit slot 1-12a, one side edge of the through electrode wiring board 1b is in plug-in limit fit with the second limit slot 1-33a and the third limit slot 1-22a respectively, and the other side edge of the through electrode wiring board 1b is in plug-in limit fit with the base limit slot 1-12 a.

Preferably, the circuit of the breaker further comprises a first breaker terminal 3-1b and a second breaker terminal 3-2b, and the through-electrode circuit further comprises a first through-electrode terminal 4-1b and a second through-electrode terminal 4-2b respectively arranged at two ends of the through-electrode wiring board 1 b; the first breaker terminal 3-1b and the second breaker terminal 3-2b are arranged in a stacked manner and are arranged on two sides of the second partition board 1-3a, and the second breaker terminal 3-2b and the second through terminal 4-2b are arranged at the other end of the shell at intervals in parallel; the first breaker terminal 3-1b, the breaker terminal plate 2b, the overload protection mechanism 7a, the contact mechanism, the short circuit protection mechanism 5a and the second breaker terminal 3-2b are sequentially connected in series.

Preferably, the circuit of the breaking electrode further comprises a conducting plate 8b of the breaking electrode, which is connected in series between the short-circuit protection mechanism 5a and the second terminal 3-2b of the breaking electrode, and the conducting plate 8b of the breaking electrode is a manganese-copper shunt and is also connected with the control circuit board group.

Preferably, the housing further comprises a first installation guide rib 1-11a and a second installation guide rib 1-40a which are arranged at one side of the housing at intervals side by side, and the first installation guide rib and the second installation guide rib are respectively arranged on the side wall of the base 1-1a and the side wall of the upper cover 1-4 a.

Preferably, the first partition board 1-2a comprises an arc striking channel 9a, the inlet of the arc extinguishing chamber 6a faces the operating mechanism 4a and is matched with the contact mechanism, and the outlet of the arc extinguishing chamber 6a is oppositely matched with the arc striking channel 9 a;

A plurality of vertical separation ribs 9-1a and a plurality of transverse separation ribs 9-2a are arranged in the arc striking channel 9a, the plurality of vertical separation ribs 91-a are arranged at one end of the arc striking channel 9a, which is close to the arc extinguishing chamber 6a, in parallel at intervals, and the plurality of transverse separation ribs 9-2a are arranged at the other end of the arc striking channel 9a and are staggered along the extending direction of the arc striking channel 9 a; the extending direction of the vertical separation rib 9-1a is consistent with the extending direction of the arc striking channel 9a, and the extending direction of the horizontal separation rib 9-2a is intersected with the extending direction of the arc striking channel 9 a.

Preferably, the first control circuit board 5-1b is arranged between the first partition board 1-2a and the base 1-1a, and comprises a first sampling element 7-1b and a second sampling element 7-2b; the circuit breaker further comprises a through pole circuit arranged in the shell, wherein the through pole circuit comprises a through pole wiring board 1b; the first sampling element 7-1b is connected with the fixed contact 8-2a, and the second sampling element 7-2b is connected with the through electrode wiring board 1b; the overload protection mechanism 7a comprises a bimetallic strip 7-1a in driving fit with the operating mechanism 4a, and the bimetallic strip 7-1a is connected with the fixed contact 8-2 a.

Preferably, the first partition board 1-2a comprises a partition board avoiding hole for avoiding the first sampling element 7-1b and positioned on the peripheral side wall of the arc striking channel 9a of the first partition board 1-2a, and the first sampling element 7-1b is positioned in the partition board avoiding hole; the second sampling element 7-2b is located between the side wall of the first partition 1-2a and the side wall of the base 1-1 a.

According to the circuit breaker disclosed by the invention, the first partition board 1-2a and the base 1-1a are matched to provide a larger assembly space for the first control circuit board 5-1b, so that the first control circuit board 5-1b is conveniently assembled, the first control circuit board 5-1b is conveniently designed, the first partition board 1-2a separates the first control circuit board 5-1b from the contact mechanism and the arc extinguishing chamber 6a, and therefore, the influence of an electric arc on the first control circuit board 5-1b is reduced to the minimum, the stable work of the first control circuit board 5-1b is ensured, and the service life of the first control circuit board 5-1b is prolonged; the first partition board 1-2a is matched with the second partition board 1-3a, so that the first control circuit board 5-1b is isolated from the breaker circuit, and the stability and the service life of the first control circuit board 5-1b are further improved.

Drawings

Fig. 1 is a schematic structural view of a circuit breaker of the present invention;

fig. 2 is a schematic view of an explosion structure of the circuit breaker of the present invention;

FIG. 3 is a schematic view of the structure of the base and control circuit board assembly of the present invention;

FIG. 4 is a schematic diagram of the structure of the first separator and breaker circuit of the present invention;

FIG. 5 is a schematic view of the structure of the second separator, the breaker terminal block, and the overload protection mechanism of the present invention;

FIG. 6 is a schematic view of the structure of a second separator according to the present invention;

FIG. 7 is a schematic view of the structure of the first separator of the present invention;

FIG. 8 is a schematic diagram of the connection structure of the short circuit protection mechanism, the breaker pole conductive plate and the second breaker pole terminal of the present invention;

FIG. 9 is a schematic diagram of the short circuit protection mechanism of the present invention;

FIG. 10 is a schematic view of the structure of the coil of the present invention;

FIG. 11 is a schematic view of the structure of the base of the present invention;

Fig. 12 is a schematic view of the structure of the upper cover of the present invention.

Detailed Description

Embodiments of the circuit breaker of the present invention are further described below with reference to the examples shown in fig. 1-12. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4 and 12, the circuit breaker of the invention is preferably a plug-in circuit breaker, and comprises a shell and a circuit breaker circuit arranged in the shell, wherein the shell comprises a base 1-1a and an upper cover 1-4a, the circuit breaker circuit comprises a button mechanism 2a, an operating mechanism 4a and a contact mechanism, the contact mechanism comprises a movable contact 8-1a and a fixed contact 8-2a which are matched for use, the button mechanism 2a is inserted at one end of the shell and is in driving connection with the operating mechanism 4a, and the operating mechanism 4a is in driving connection with the movable contact 8-1 a; the button mechanism 2a is pressed/pulled, and the moving contact 8-1a and the fixed contact 8-2a are driven to be closed/opened through the operating mechanism 4a, so that the circuit breaker is closed/opened.

Preferably, as shown in fig. 1 to 4, the circuit breaker of the present invention further comprises a through-pole circuit provided in the housing, the through-pole circuit comprising a through-pole wiring board 1b and first through-pole terminals 4-1b and second through-pole terminals 4-2b connected to both ends of the through-pole wiring board 1b, respectively. Namely, the wiring terminals at the two ends of the through electrode circuit finger are directly connected through the wires, and no break point is arranged.

Preferably, as shown in fig. 1-3, the circuit breaker further comprises an electric operation device 3a, the electric operation device 3a comprises a motor 3-1a and a gear set 3-2a, the motor 3-1a is in driving fit with the operation mechanism 4a through the gear set 3-2a, and the electric operation device 3a drives the movable contact 8-1a to be closed with the fixed contact 8-2a through the operation mechanism 4a, so that the circuit breaker is closed. Further, the electric operation device 3a drives the breaker to open via the operation mechanism 4a, or the electric operation device 3a drives the operation mechanism 4a to operate via the button mechanism 2a, so that the breaker is opened.

Preferably, as shown in fig. 1-4, the circuit breaker circuit further comprises a short-circuit protection mechanism 5a, an overload protection mechanism 7a and an arc extinguishing chamber 6a; the short-circuit protection mechanism 5a and the overload protection mechanism 7a are respectively in driving fit with the operating mechanism 4a, and when the circuit breaker is in short circuit or overload fault, the operating mechanism 4a drives the circuit breaker to break or trip; the arc extinguishing chamber 6a is matched with the contact mechanism to extinguish the arc generated when the movable contact 8-1a and the fixed contact 8-2a are closed/disconnected. It is necessary to pay out that one or more of the short-circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguishing chamber 6a can be omitted according to actual needs.

Preferably, as shown in fig. 1-4, the circuit further comprises a first circuit breaker terminal 3-1b and a second circuit breaker terminal 3-2b, and the contact mechanism, the overload protection mechanism 7a and the short circuit protection mechanism 5a are connected in series between the first circuit breaker terminal 3-1b and the second circuit breaker terminal 3-2 b. Further, as shown in fig. 1, the first breaker terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short circuit protection mechanism 5a and the second breaker terminal 3-2b are sequentially connected in series.

Preferably, as shown in fig. 1, the first breaker terminal 3-1b and the button mechanism 2a are arranged side by side at one end of the housing, and the second breaker terminal 3-2b is arranged at the other end of the housing; the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell; the short-circuit protection mechanism 5a and the arc extinguishing chamber 6a are arranged side by side; the button mechanism 2a and the short-circuit protection mechanism 5a are respectively positioned at two sides of the operating mechanism 4a, and the first breaker terminal 3-1b and the arc extinguishing chamber 6a are positioned at two sides of the overload protection mechanism 7 a; the short-circuit protection mechanism 5a is located between the second breaker terminal 3-2b and the operating mechanism 4 a. It should be noted that the positions of the overload protection mechanism 7a and the short-circuit protection mechanism 5a may be interchanged. Further, as shown in fig. 2-4, the first through-electrode terminal 4-1b and the first circuit breaker terminal 3-1b are disposed at one end of the housing; the second through electrode terminal 4-2b and the second circuit breaker terminal 3-2b are arranged at the other end of the shell at intervals side by side.

The main improvement points of the circuit breaker of the invention are as follows:

Preferably, as shown in fig. 1, 2 and 4, the housing further comprises a second partition board 1-3a arranged between the base 1-1a and the upper cover 1-4a, and the second partition board 1-3a is arranged side by side with the button mechanism 2 a; the circuit further comprises a circuit-breaking pole wiring board 2b connected in series in the circuit-breaking pole circuit, the motor 3-1a is arranged on the base 1-1a and is positioned between the base 1-1a and the second partition board 1-3a, and the circuit-breaking pole wiring board 2b is arranged on the second partition board 1-3a and is positioned between the second partition board 1-3a and the upper cover 1-4 a. The circuit breaker pole wiring board 2b, the second partition board 1-3a and the motor 3-1a are arranged in position, and the second partition board 1-3a and the button mechanism 2a are arranged in position, so that the full utilization of the internal space of the shell is realized, the internal structure of the circuit breaker is more compact, and the miniaturization development trend of the circuit breaker is facilitated. Further, as shown in fig. 2, 4 and 5, the second separator 1-3a includes a second separator outer section 1-30a and a second separator inner section 1-31a which are sequentially connected, two sides of the second separator outer section 1-30a are respectively provided with a terminal assembly groove, the first breaker terminal 3-1b and the first straight-through terminal 4-1b are respectively arranged in the terminal assembly groove, and the motor 3-1a and the breaker terminal plate 2b are respectively positioned at two sides of the second separator inner section 1-31 a. The second separator 1-3a not only realizes the lamination arrangement of the first breaker terminal 3-1b and the first straight-through terminal 4-1b, but also ensures the insulativity between the two, so that the internal layout of the circuit breaker is more compact, and the insulativity of the circuit breaker is ensured.

Preferably, as shown in fig. 1-4, the breaker terminal block 2b is connected in series between the first breaker terminal 3-1b and the overload protection mechanism 7 a.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a control circuit board group disposed in the housing, the control circuit board group including a first control circuit board 5-1b; as shown in fig. 2-4, the housing further includes a first partition 1-2a provided between the base 1-1a and the upper cover 1-4 a; the operating mechanism 4a, the contact mechanism, the short-circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguishing chamber 6a are respectively arranged on the first partition board 1-2a and are respectively positioned between the first partition board 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged on the base 1-1a and is positioned between the base 1-1a and the first partition board 1-2 a. The first partition board 1-2a and the base 1-1a cooperate to provide a larger assembly space for the first control circuit board 5-1b, so that firstly, the assembly of the first control circuit board 5-1b is facilitated, secondly, the design of the first control circuit board 5-1b is facilitated, thirdly, the first partition board 1-2a separates the first control circuit board 5-1b from the contact mechanism and the arc extinguishing chamber 6a, and therefore the influence of an electric arc on the first control circuit board 5-1b is reduced to the minimum, the stable operation of the first control circuit board 5-1b is ensured, and the service life of the first control circuit board 5-1b is prolonged. Furthermore, the first partition board 1-2a is matched with the second partition board 1-3a, so that the first control circuit board 5-1b is isolated from the breaker circuit, and the stability and the service life of the first control circuit board 5-1b are further improved.

Preferably, as shown in fig. 1,2 and 4, the first partition board 1-2a further comprises an arc striking channel 9a matched with the arc extinguishing chamber 6a, wherein the inlet of the arc extinguishing chamber 6a is matched with the contact mechanism towards the operating mechanism 4a, and the outlet of the arc extinguishing chamber 6a is oppositely matched with the arc striking channel 9 a. The arc striking channel 9a is matched with the arc extinguishing chamber 6a, so that the damage to other components in the circuit breaker caused by ionized gas or residual arc discharged from the arc extinguishing chamber 6a is avoided, the stable operation of the circuit breaker is ensured, and the service life of the circuit breaker is prolonged. Further, as shown in fig. 1, a plurality of vertical ribs 9-1a and a plurality of horizontal ribs 9-2a are arranged in the arc striking channel 9a, the plurality of vertical ribs 91-a are arranged at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a in parallel at intervals, and the plurality of horizontal ribs 9-2a are arranged at the other end of the arc striking channel 9a in a staggered manner along the extending direction of the arc striking channel 9 a; the extending direction of the vertical separation rib 9-1a is consistent with the extending direction of the arc striking channel 9a, and the extending direction of the horizontal separation rib 9-2a is intersected with the extending direction of the arc striking channel 9 a. The vertical separation ribs 9-1a and the horizontal separation ribs 9-2a realize effective cutting of the electric arc, are beneficial to improving the arc extinguishing efficiency and the arc extinguishing effect, and improve the arc extinguishing performance of the circuit breaker.

Preferably, as shown in fig. 2 and 3, the control circuit board set further includes a second control circuit board 5-2b stacked with the first control circuit board 5-1b, and the gear set 3-2a is disposed on the second control circuit board 5-2b between the second control circuit board 5-2b and the upper cover 1-4 a. Further, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a first detecting member 6-1b and a second detecting member 6-2b respectively provided on the second control circuit board 5-2b, respectively, to be engaged with the button mechanism 2a and the gear set 3-2a, respectively. Further, as shown in fig. 2 and 3, the first detecting member 6-1b and the second detecting member 6-2b are micro switches. The first detecting piece 6-1b detects the position of the button mechanism 2a, and the second detecting piece 6-2b detects the position of a gear in the gear set, so that the working state (including a closing state, a separating state and a tripping state) of the circuit breaker can be judged from the output signals of the first detecting piece 6-1b and the second detecting piece 6-2 b.

Preferably, as shown in fig. 8 and 9, the short-circuit protection mechanism 5a includes a frame 5-4a, an iron core assembly, a push rod 5-1a, a coil 5-2a and a magnetic yoke 5-3a, wherein the iron core assembly and the push rod 5-1a are arranged in the middle of the frame 5-4a, the coil 5-2a is sleeved on the frame 5-4a, and the magnetic yoke 5-3a is wrapped outside the coil 5-2 a; the coil 5-2a is of a U-shaped structure and is connected with the contact mechanism in series. The short-circuit protection mechanism 5a is simple in structure, convenient to assemble and beneficial to improving the assembly efficiency of the circuit breaker. Further, the coil 5-2a includes a coil main body 5-20a, and a first welding pin 5-21a and a second welding pin 5-22a connected to two ends of the coil main body 5-20a, wherein the first welding pin 5-21a and the second welding pin 5-22a are arranged in a staggered manner, so that the connection of the coil 5-2a is facilitated.

The circuit breaker of the present invention will be further described with reference to the drawings and the specific embodiments of the present invention.

As shown in fig. 1-4 and 12, is one embodiment of the circuit breaker of the present invention.

As shown in fig. 1-4 and 12, the circuit breaker of the present invention is preferably a plug-in circuit breaker, which includes a housing, and a breaker pole circuit and a through pole circuit respectively disposed in the housing.

As shown in fig. 1 to 4, the circuit breaker circuit includes a button mechanism 2a, an electrically operated device 3a, an operating mechanism 4a, a contact mechanism, a short-circuit protection mechanism 5a, an overload protection mechanism 7a, an arc extinguishing chamber 6a, a first breaker terminal 3b-1 and a second breaker terminal 3b-2; the electric operation device 3a comprises a motor 3-1a and a gear set 3-2a, and the contact mechanism comprises a movable contact 8-1a and a fixed contact 8-2a which are matched for use; the first breaker terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short circuit protection mechanism 5a and the second breaker terminal 3-2b are sequentially connected in series; the short-circuit protection mechanism 5a and the overload protection mechanism 7a are respectively in driving fit with the operating mechanism 4a, and when a short circuit or overload fault occurs to the circuit breaker, the short-circuit protection mechanism 5a or the overload protection mechanism 7a enables the circuit breaker to be opened (or tripped) through the operating mechanism 4a; the arc extinguishing chamber 6a is matched with the contact mechanism and is used for extinguishing an arc generated when the movable contact 8-1a and the fixed contact 8-2a are closed/opened; the button mechanism 2a is inserted at one end of the shell and is in driving connection with the operating mechanism 4a, the motor 3-1a is in driving fit with the operating mechanism 4a through the gear set 3-2a, and the operating mechanism 4a is in driving connection with the moving contact 8-1 a. Further, as shown in fig. 1, the button mechanism 2a can be pressed/pulled to drive the moving contact 8-1a and the fixed contact 8-2a to be closed/opened through the operating mechanism 4a, so that the breaker is closed/opened; the electric operation device 3a drives the movable contact 8-1a to be closed/opened with the fixed contact 8-2a through the operation mechanism 4a, and the electric operation device 3a drives the movable contact 8-1a to be closed/opened with the fixed contact 8-2a through the button mechanism 2a and the operation mechanism 4 a.

Specifically, as shown in fig. 1, the gear set 3-2a of the electric operating device 3a is directly in driving fit with the operating mechanism 4a (the transmission member 4-1a of the operating mechanism 4 a) to drive the breaker to close; a driving boss is arranged on one gear in the gear set 3-2a of the electric operating device 3a, and when the circuit breaker is in a closing state, the driving boss is in driving fit with the button mechanism 2a, so that the button mechanism 2a moves (the moving direction is the same as the direction when the button mechanism 2a is pulled) and the circuit breaker is opened through the operating mechanism 4 a; the electric operating device 3a drives the breaker to open/close, and the motor 3-1a always rotates in the same direction. Of course, it should be noted that the electric operating device 3a may be directly in driving engagement with the operating mechanism 4a to switch on/off the circuit breaker, and the motor 3-1a may rotate in a first direction to drive the circuit breaker to switch on and rotate in a second direction to drive the circuit breaker to switch off, where the first direction and the second direction are opposite directions to each other, and the principle of switching on/off the circuit breaker driven by the electric operating device in the prior art is the same, and will not be repeated herein.

Preferably, as shown in fig. 1,2 and 4, the circuit breaker further comprises a circuit breaker terminal block 2b connected in series between the first circuit breaker terminal 3-1b and the overload protection mechanism 7 a.

Preferably, as shown in fig. 1,2, 4 and 8, the circuit breaker circuit further comprises a circuit breaker conducting plate 8b connected in series between the short-circuit protection mechanism 5a and the second circuit breaker terminal 3-2 b. Further, the open-circuit pole conductive plate 8b is a manganese-copper shunt.

As shown in fig. 4, the through-electrode circuit includes a through-electrode wiring board 1b, a first through-electrode terminal 4-1b and a second through-electrode terminal 4-2b provided at both ends of the through-electrode wiring board 1b, respectively.

Preferably, as shown in fig. 1-4, the first breaker terminal 3-1b, the first through terminal 4-1b and the button mechanism 2a are located at the same end of the casing, and the second breaker terminal 3-2b and the second through terminal 4-2b are arranged at the other end of the casing in a side-by-side and spaced manner; the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell side by side, the arc extinguishing chamber 6a and the short-circuit protection mechanism 5a are arranged side by side, the electric operating device 3a and the button mechanism 2a are arranged side by side and are positioned between the first circuit breaker terminal 3-1b and the overload protection mechanism 4-2b, the gear set 3-2a is positioned between the motor 3-1a and the button mechanism 2a, the arc extinguishing chamber 6a is positioned between the overload protection mechanism 7a and the second through terminal 4-2b, the short-circuit protection mechanism 5a is positioned between the operating mechanism 4a and the second circuit breaker terminal 3-2b, and the button mechanism 2a and the short-circuit protection mechanism 5a are respectively positioned on two sides of the operating mechanism 4 a.

As shown in fig. 1,2, 4, 5, is an embodiment of the circuit-breaking-pole terminal block 2 b: the circuit-breaking pole wiring board 2b comprises an external wiring board 2-5b, an external transition board 2-2b, a main body board 2-1b, an internal transition board 2-3b and an internal wiring board 2-4b which are sequentially connected, the external transition board 2-2b, the main body board 2-1b and the internal transition board 2-3b are integrally in a U-shaped structure, the external wiring board 2-5b and the internal wiring board 2-4b respectively extend towards the two ends of the circuit-breaking pole wiring board, the external wiring board 2-5a is connected with the first circuit-breaking pole wiring board 3-1b, and the internal wiring board 2-4b is connected with the overload protection mechanism 7 a. Further, as shown in fig. 5, the circuit-breaking pole connection board 2b includes two first limiting legs protruding from one side thereof, respectively, and disposed at intervals. Further, as shown in fig. 5, the circuit breaker terminal plate 2b has an integral structure and is formed by punching and bending a metal plate.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a control circuit board group including a first control circuit board 5-1b and a second control circuit board 5-2b respectively disposed in the housing. Further, as shown in fig. 2 and 3, the second control circuit board 5-2b and the first control circuit board 5-1b are stacked, the first control circuit board 5-1b is respectively disposed on the base 1-1a, and the second control circuit board 5-2b is located between the first control circuit board 5-1b and the upper cover 1-4 a.

Preferably, as shown in fig. 2 and 3, the first control circuit board 5-1b includes a first sampling element 7-1b and a second sampling element 7-2b, the first sampling element 7-1b is connected to the stationary contact 8-2a, and the second sampling element 7-2b is connected to the through electrode wiring board 1 b. Further, as shown in fig. 1 and 7, the first partition board 1-2a includes a partition board avoiding hole for avoiding the first sampling element 7-1b and located on the outer peripheral side wall of the arc striking channel 9a of the first partition board 1-2a, and the first sampling element 7-1b is located in the partition board avoiding hole; the second sampling element 7-2b is located between the side wall of the base 1-1a and the side wall of the first partition 1-2 a.

Preferably, as shown in fig. 2 and 3, the first control circuit board 5-1b further includes a conductive plate connection plug 7-3b, and the break pole conductive plate 8b is connected to the conductive plate connection plug 7-3b through a connection wire.

Preferably, as shown in fig. 3, the first control circuit board 5-1b further includes a motor connection plug 7-5b, and the motor 3-1a is connected to the motor connection plug 7-5b through a connection wire.

Preferably, as shown in fig. 2 and 3, the first control circuit board 5-1b further includes an output signal terminal 7-4b, and the output signal terminal 7-4b is disposed at an end of the first control circuit board 5-1b remote from the operating mechanism 4 a. Further, the output signal terminal 7-4b has a square column structure, and a pair of side walls thereof are respectively provided with a positioning boss.

Preferably, the first control circuit board 5-1b includes a protection circuit and a control circuit of the circuit breaker, which can be used for automatic switching control, sampling monitoring of current and voltage, external communication, and the like.

Specifically, as shown in the direction of fig. 2, the first sampling element 7-1b, the second sampling element 7-2b, and the conductive plate connection plug 7-3b are disposed at the lower end of the first control circuit board 5-1b, the first sampling element 7-1b and the second sampling element 7-2b are located at the left side of the lower end of the first control circuit board 5-1b, and the conductive plate connection plug 7-3b is located at the right side of the lower end of the first control circuit board 5-1 b; the motor connecting plug 7-5b is arranged at the upper end of the first control circuit board 5-1 b; the output signal terminal 7-4a is arranged in the middle of the lower end of one side of the first control circuit board 5-1 b.

Preferably, as shown in fig. 3, the gear set 3-2a is disposed between the second control circuit board 5-2b and the upper cover 1-4 a. Further, as shown in fig. 3, in the gear set 3-2a, the rotation shafts of the gears respectively pass through the second control circuit board 5-2b and are fixed on the base 1-1 a.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a first detecting member 6-1b and a second detecting member 6-2b respectively provided on the second control circuit board 5-2b, respectively, to be engaged with the button mechanism 2a and the gear set 3-2a, respectively. Further, as shown in fig. 2 and 3, the first detecting element 6-1b and the second detecting element 6-2b are micro switches, and the arrangement direction of the first detecting element 6-1b and the second detecting element is vertical. It should be noted that the arrangement direction of the first detecting element 6-1b and the second detecting element 6-2b is vertical, so that the swinging plane of the driving rod of the first detecting element 6-1b is vertical to the swinging plane of the driving rod of the second detecting element 6-2b parallel to the second control circuit board 5-2b, thereby enabling the two to be better matched with the button mechanism 2a and the gear set 3-2a respectively.

Preferably, as shown in fig. 3, the gear set 3-a includes a final drive gear 3-20a in driving engagement with the operating mechanism 4a, and a gear drive boss is provided on one side of the final drive gear 3-20a in driving engagement with the second detecting element 6-2 a.

Specifically, as shown in fig. 2 and 3, when the button mechanism 2a is pressed to close the circuit breaker by the operation mechanism 4a, the button mechanism 2a presses the driving rod of the first detection element 6-1b, so that the first detection element 6-1b is triggered, and when the button mechanism 2a is pulled to open the circuit breaker by the operation mechanism 4a, the button mechanism 2a is separated from the driving rod of the first detection element 6-1 a; when the electric operating device 3a drives the breaker to switch on through the operating mechanism 4a, the gear driving boss presses the driving rod of the second detecting element 6-2b, the second detecting element 6-2b is triggered, and when the electric operating device 3a drives the breaker to switch off through the button mechanism 2a and the operating mechanism 4a, the gear driving boss releases the driving rod of the second detecting element 6-1 b.

Preferably, as shown in fig. 1-4, 6-7, 11-12, is one embodiment of the housing: the shell comprises a base 1-1a, an upper cover 1-4a, a first partition board 1-2a and a second partition board 1-3a which are respectively arranged between the base 1-1a and the upper cover 1-4 a.

Preferably, as shown in fig. 1,2, 4 and 7, the operating mechanism 4a, the overload protection mechanism 7a, the short-circuit protection mechanism 5a and the arc extinguishing chamber 6a are respectively arranged on the first partition board 1-2a and positioned between the first partition board 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged on the base 1-1a and positioned between the base 1-1a and the first partition board 1-2 a; the second partition board 1-3a is arranged side by side with the button mechanism 2a, the motor 3-1a is arranged on the base 1-1a and is positioned between the second partition boards 1-3a, and the breaking pole wiring board 2b is arranged on the second partition board 1-3a and is positioned between the second partition board 1-3a and the upper cover 1-4 a. Further, as shown in fig. 1,4 and 5, the first breaker terminal 3-1b is disposed on one side of the second separator 1-3a and located between the second separator 1-3a and the base 1-1a, the first through electrode terminal 4-1b is disposed on the other side of the second separator 1-3a and located between the second separator 1-3a and the upper cover 1-4a, and the first through electrode terminal 4-1b and the first breaker terminal 3-1b are stacked in the thickness direction of the housing and located on both sides of the second separator 1-3 a.

Preferably, as shown in FIG. 11, the base 1-1a includes a motor mounting chamber 1-10a provided on a bottom wall thereof, and the motor 3-1a is provided in the motor mounting chamber 1-10 a. The motor 3-1a is reliably limited between the second partition board 1-3a and the base 1-1a, so that the motor 3-1a is prevented from moving, and the size of the circuit breaker is reduced.

Preferably, as shown in fig. 6, 7 and 11, one side edge of the through electrode wiring board 1b is in limit fit with the first separator 1-2a and the second separator 1-3a respectively, and the other side edge of the through electrode wiring board 1b is in limit fit with the base 1-1 a. Further, as shown in fig. 7, the first partition board 1-2a includes a third limit slot 1-22a, as shown in fig. 6, the second partition board 1-3a includes a second limit slot 1-33a, as shown in fig. 11, the base 1-1a includes a base limit slot 1-12a, one side edge of the through electrode wiring board 1b is in plug-in limit fit with the second limit slot 1-33a and the third limit slot 1-22a, and the other side edge of the through electrode wiring board 1b is in plug-in limit fit with the base limit slot 1-12 a. Specifically, as shown in fig. 11, the base limit slot 1-12a is disposed on a side wall of the base 1-1a, as shown in fig. 6, the second limit slot 1-33a is disposed on a side of the second partition board 1-3a facing the base 1-1a, as shown in fig. 7, and the third limit slot 1-22a is disposed on a side of the first partition board 1-2a facing the base 1-1 a.

Preferably, as shown in fig. 5, the circuit-breaking pole connection board 2b includes two first spacing pins protruding from one side of the circuit-breaking pole connection board respectively and arranged at intervals, the second partition board 1-2a includes two first spacing slots 1-32a arranged at intervals, and the two first spacing pins are respectively inserted into the two first spacing slots 1-32 a.

Preferably, as shown in fig. 1,2 and 4, the first partition board 1-2a further comprises an arc striking channel 9a matched with the arc extinguishing chamber 6 a; the inlet of the arc extinguishing chamber 6a faces the operating mechanism 4a to be matched with the contact mechanism, and the contact of the arc extinguishing chamber 6a is oppositely matched with the arc striking channel 9 a. Further, as shown in fig. 1, a plurality of vertical ribs 9-1a and a plurality of horizontal ribs 9-2a are arranged in the arc striking channel 9a, the plurality of vertical ribs 9-1a are arranged at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a at intervals side by side, and the plurality of horizontal ribs 9-2a are arranged at the other end of the arc striking channel 9a and are arranged side by side in a staggered manner along the extending direction of the arc striking channel 9a; the extending direction of the vertical separation rib 9-1a is consistent with the extending direction of the arc striking channel 9a, and the extending direction of the horizontal separation rib 9-2a is crossed (for example, vertical) with the extending direction of the arc striking channel 9 a.

Preferably, as shown in fig. 3, 7 and 11, the base 1-1a includes a signal terminal fitting groove 1-13a, the first partition 1-2a includes a signal terminal stopper 1-23a provided at an end portion thereof facing the base 1-1a, and the output signal terminal 7-4b is provided in the signal terminal fitting groove 1-13a and is stopped between the base 1-1a and the signal terminal stopper 1-23 a.

Preferably, as shown in fig. 1, 3, 11 and 12, the housing further includes first and second installation guide ribs 1-11a and 1-40a disposed at a side thereof side by side with a space therebetween, and disposed on the side wall of the base 1-1a and the side wall of the upper cover 1-4a, respectively. Further, as shown in fig. 11 and 12, the first mounting bead 1-11a and the second mounting bead 1-40a each extend along the length direction of the housing. When the circuit breaker is assembled to the installation cabinet or the power distribution cabinet, the first installation guide ribs 1-11a and the second installation guide ribs 1-40a are respectively in limit fit with the cabinet body, so that the circuit breaker is prevented from deviating from the correct position and/or being inclined in position, and the normal operation of the circuit breaker is prevented from being influenced.

As shown in fig. 4-6, is one embodiment of the second separator 1-3 a: the second separator 1-3a comprises a second separator outer section 1-30a and a second separator inner section 1-31a which are sequentially connected, two sides of the second separator outer section 1-30a are respectively provided with a terminal assembly groove, a first through electrode terminal 4-1b and a first breaking electrode terminal 3-1b are respectively arranged in the two terminal assembly grooves, a breaking electrode wiring board 2b is arranged on the second separator inner section 1-31a and is positioned between the second separator inner section 1-31a and the upper cover 1-4a, and a motor 3-1a is arranged on the base 1-1a and is positioned between the base 1-1a and the second separator inner section 1-31 a.

Preferably, as shown in fig. 4-6, the second partition inner section 1-31a includes a first transverse wall 1-310a and a first vertical wall 1-311a, the first transverse wall 1-310a is disposed in the middle of the first vertical wall 1-311a, the circuit-breaking pole wiring board 2b and the motor 3-1a are respectively disposed at two sides of the first transverse wall 1-310a, and a second limiting slot 1-33a is disposed on a side of the first vertical wall 1-311a facing the base 1-1 a. Further, as shown in fig. 6, a baffle motor limiting groove is formed on one side of the first transverse wall 1-310a facing the base 1-1 a.

Preferably, as shown in fig. 5, the second partition board 2b further includes two first limiting slots 1-32a disposed at intervals. Specifically, as shown in fig. 5, the two first limiting slots 1-32a are respectively located at two ends of the inner section 1-31a of the second partition board.

As shown in fig. 1, one embodiment of the button mechanism 2a is: the button mechanism 2a comprises a button piece 2-1a, a first connecting rod 2-2a, a connecting piece 2-3a and a second connecting rod 2-4a which are sequentially connected, wherein the button piece 2-1a is arranged on the shell in a sliding manner, and the second connecting rod 2-4a is also in driving connection with a rotating plate 4-4a of the operating mechanism 4 a. It should be noted that the button member 2-1a, the first link 2-2a and the connecting member 2-3a may be provided as an integral member, but the circuit breaker of the present invention preferably employs the above-described split button mechanism 2a for better cooperation with the electrically operated device 3a (e.g., the electrically operated device 3a is drivingly engaged with the connecting member 2-3, the circuit breaker is opened by the operating mechanism 4 a) and for facilitating provision of a locking mechanism (e.g., a locking mechanism that prevents the circuit breaker from being loaded into the installation cabinet or the power distribution cabinet in the closed state or a locking mechanism that prevents the circuit breaker from being pulled out of the installation cabinet or the power distribution cabinet in the closed state).

As shown in fig. 1, one embodiment of the operating mechanism 4a is as follows: the operating mechanism 4a comprises a transmission part 4-1a, a third connecting rod 4-2a, a locking part 4-3a, a rotating plate 4-4a and a jump fastener 4-5a, wherein the transmission part 4-1a and the rotating plate 4-4a are respectively pivoted on the first partition plate 1-2a, the locking part 4-3a and the jump fastener 4-5a are respectively pivoted on the rotating plate 4-4a, the transmission part 4-1a is connected with the locking part 4-3a through the third connecting rod 4-2a, the rotating plate 4-4a is in driving connection with the moving contact 8-1a, and the overload protection mechanism 7a and the short circuit protection mechanism 5a are respectively in driving fit with the jump fastener 4-1 a.

As shown in fig. 1, 2, 4, 5, is an embodiment of the overload protection mechanism 7 a: the overload protection mechanism 7a comprises a bimetallic strip 7-1a and a driving connecting rod 7-2a, one end of the bimetallic strip 7-1a is connected with the fixed contact 8-2a, and the other end of the bimetallic strip is in driving connection with the jump fastener 4-5a of the operating mechanism 4a through the driving connecting rod 7-2 a. Further, as shown in fig. 1, the first partition board 1-2a includes a guide rail structure 1-21a, one end of the driving link 7-1a is in driving connection with the trip fastener 4-5a, and the other end is matched with the guide rail structure 1-21a, so that the action path of the driving link 7-1a is limited and guided, and the time delay trip characteristic of the circuit breaker is ensured. Further, as shown in fig. 1, the guide rail structure 1-21a is a guide groove provided on the first partition board 1-21 a.

Preferably, as shown in fig. 5, one end of the circuit-breaking pole wiring board 2b is connected with the first circuit-breaking pole wiring board 3-1b, and the other end is connected with the middle part of the bimetallic strip 7-1a and the static contact bridge 8-21a of the static contact 8-2a through the first flexible connection 9-1b and the second flexible connection 9-2b respectively, so that the whole temperature rise of the circuit breaker can be reduced in the shunt mode.

As shown in fig. 8-10, one embodiment of the short-circuit protection mechanism 5a is shown: the short-circuit protection mechanism 5a comprises a framework 5-4a, an iron core assembly, a push rod 5-1a, a coil 5-2a and a magnetic yoke 5-3a, wherein the iron core assembly 5-0a, a spring and the push rod 5-1a are respectively arranged in the middle of the framework 5-4a, the coil 5-2a is sleeved on the framework 5-4a, the magnetic yoke 5-3a is wrapped outside the coil 5-2a, and the coil 5-2a is of a U-shaped structure. The coil 5-2a has a simple structure, and can remarkably reduce heat generation and good heat dissipation while meeting the instantaneous tripping characteristic of the short-circuit protection mechanism 5a, thereby ensuring the reliability of the short-circuit protection mechanism 5 a. Further, the iron core assembly 5-0a comprises a static iron core and a movable iron core, a spring is arranged between the static iron core and the movable iron core, and the ejector rod 5-1a is in linkage with the movable iron core.

Preferably, as shown in fig. 10, the coil 5-2a includes a coil main body 5-20a, and a first welding pin 5-21a and a second welding pin 5-22a connected to two ends of the coil main body 5-20a, where the first welding pin 5-21a and the second welding pin 5-22a are arranged in a staggered manner; the first welding pin 5-21a is welded with the magnetic yoke 5-3a and is connected to the moving contact 8-1a through a welding flexible wire, and the second welding pin 5-22a is welded with one end of the circuit breaking pole conducting plate 8 b. The first welding pin 5-21a and the second welding pin 5-22a are respectively welded and connected with the magnetic yoke 5-3a and the open-circuit pole conducting plate 8b, so that the coil 5-2a is reliably positioned, and the integral installation of the short-circuit protection mechanism 5a is facilitated.

Preferably, as shown in fig. 1,2 and 9, the yoke 5-3a has a U-shaped structure, the opening of which faces the side wall of the base 1-1a, the opening of the U-shaped structure of the coil 5-2a faces the first partition 1-2a, and the opening direction of the U-shaped structure of the yoke 5-3a is perpendicular to the opening direction of the U-shaped structure of the coil 5-2, which is beneficial to reducing the assembly space occupied by the short-circuit protection mechanism 5 a.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. A circuit breaker includes a housing and a breaker circuit disposed in the housing, respectively; the shell comprises a base (1-1 a) and an upper cover (1-4 a), a circuit breaker circuit comprises a circuit breaker wiring board (2 b), a button mechanism (2 a), an electric operating device (3 a), an operating mechanism (4 a), a contact mechanism, a short-circuit protection mechanism (5 a), an overload protection mechanism (7 a) and an arc extinguishing chamber (6 a), the electric operating device (3 a) comprises a motor (3-a) and a gear set (3-2 a), and the contact mechanism comprises a movable contact (8-1 a) and a fixed contact (8-2 a) which are matched for use; the button mechanism (2 a) is in driving connection with the operating mechanism (4 a), the motor (3-1 a) is in driving fit with the operating mechanism (4 a) through the gear set (3-2 a), and the operating mechanism (4 a) is in driving connection with the moving contact (8-1 a); the method is characterized in that: the shell further comprises a first partition board (1-2 a) and a second partition board (1-3 a) which are arranged between the base (1-1 a) and the upper cover (1-4 a), the button mechanism (2 a) and the second partition board (1-3 a) are arranged at one end of the shell side by side, the circuit breaking pole wiring board (2 b) is arranged on the second partition board (1-3 a) and is positioned between the second partition board (1-3 a) and the upper cover, the motor (3-1 a) is arranged on the base (1-1 a) and is positioned between the base (1-1 a) and the second partition board (1-3 a), and the operating mechanism (4 a), the contact mechanism, the short-circuit protection mechanism (5 a), the overload protection mechanism (7 a) and the arc extinguishing chamber (6 a) are respectively arranged on the first partition board (1-2 a) and are all positioned between the first partition board (1-2 a) and the upper cover (1-4 a).

2. The circuit breaker according to claim 1, characterized in that: the circuit breaker further comprises a control circuit board group, the control circuit board group comprises a first control circuit board (5-1 b) and a second control circuit board (5-2 b) which are arranged in a stacked mode, the first control circuit board (5-1 b) is arranged between the first partition board (1-2 a) and the base (1-1 a), the second control circuit board (5-2 b) is located between the motor (3 a) and the upper cover (1-4 a), and the gear set (3-2 a) is located between the second control circuit board (5-2 b) and the upper cover (1-4 b).

3. The circuit breaker according to claim 1, characterized in that: the operating mechanism (4 a) and the overload protection mechanism (7 a) are arranged in the middle of the shell side by side, the short-circuit protection mechanism (5 a) and the arc extinguishing chamber (6 a) are arranged side by side, the button mechanism (2 a) and the short-circuit protection mechanism (5 a) are respectively positioned at two sides of the operating mechanism (4 a), the second partition board (1-3 a) and the arc extinguishing chamber (6 a) are respectively positioned at two sides of the overload protection mechanism (7 a), and the gear set (3-2 a) is positioned between the motor (3-1 a) and the button mechanism (2 a).

4. A circuit breaker according to any one of claims 1-3, characterized in that: the circuit breaker further comprises a through electrode circuit arranged in the shell, the through electrode circuit comprises a through electrode wiring board (1 b), one side edge of the through electrode wiring board (1 b) is in limit fit with the first partition board (1-2 a) and the second partition board (1-3 a) respectively, and the other side edge of the through electrode wiring board (1 b) is in limit fit with the base (1-1 a).

5. The circuit breaker of claim 4, wherein: the first partition board (1-2 a) comprises a third limit slot (1-22 a), the second partition board (1-3 a) comprises a second limit slot (1-33 a), the base (1-1 a) comprises a base limit slot (1-12 a), one side edge of the through electrode wiring board (1 b) is in plug-in limit fit with the second limit slot (1-33 a) and the third limit slot (1-22 a) respectively, and the other side edge of the through electrode wiring board (1 b) is in plug-in limit fit with the base limit slot (1-12 a).

6. The circuit breaker of claim 4, wherein: the circuit of the circuit breaker also comprises a first circuit breaker terminal (3-1 b) and a second circuit breaker terminal (3-2 b), and the through electrode circuit also comprises a first through electrode terminal (4-1 b) and a second through electrode terminal (4-2 b) which are respectively arranged at two ends of the through electrode wiring board (1 b); the first circuit breaker terminal (3-1 b) and the second circuit breaker terminal (3-2 b) are arranged in a stacked mode and are arranged on two sides of the second partition board (1-3 a), and the second circuit breaker terminal (3-2 b) and the second through electrode terminal (4-2 b) are arranged at the other end of the shell at intervals in parallel; the first circuit breaking pole wiring terminal (3-1 b), the circuit breaking pole wiring board (2 b), the overload protection mechanism (7 a), the contact mechanism, the short circuit protection mechanism (5 a) and the second circuit breaking pole wiring terminal (3-2 b) are sequentially connected in series.

7. The circuit breaker of claim 6, wherein: the circuit breaking pole circuit further comprises a circuit breaking pole conducting plate (8 b) connected in series between the short circuit protection mechanism (5 a) and the second circuit breaking pole wiring end (3-2 b), wherein the circuit breaking pole conducting plate (8 b) is a manganese copper shunt and is further connected with the control circuit board group.

8. The circuit breaker according to claim 1, characterized in that: the shell also comprises a first installation guide rib (1-11 a) and a second installation guide rib (1-40 a) which are arranged on one side of the shell at intervals side by side, and the first installation guide rib and the second installation guide rib are respectively arranged on the side wall of the base (1-1 a) and the side wall of the upper cover (1-4 a).

9. The circuit breaker according to claim 1, characterized in that: the first partition board (1-2 a) comprises an arc striking channel (9 a), an inlet of the arc extinguishing chamber (6 a) faces the operating mechanism (4 a) and is matched with the contact mechanism, and an outlet of the arc extinguishing chamber (6 a) is oppositely matched with the arc striking channel (9 a);

A plurality of vertical separation ribs (9-1 a) and a plurality of transverse separation ribs (9-2 a) are arranged in the arc striking channel (9 a), the plurality of vertical separation ribs (91-a) are arranged at one end of the arc striking channel (9 a) close to the arc extinguishing chamber (6 a) at intervals side by side, and the plurality of transverse separation ribs (9-2 a) are arranged at the other end of the arc striking channel (9 a) along the extension direction of the arc striking channel (9 a) in a staggered manner; the extending direction of the vertical separating rib (9-1 a) is consistent with the extending direction of the arc striking channel (9 a), and the extending direction of the horizontal separating rib (9-2 a) is intersected with the extending direction of the arc striking channel (9 a).

10. The circuit breaker of claim 4, wherein: the first control circuit board (5-1 b) is arranged between the first partition board (1-2 a) and the base (1-1 a) and comprises a first sampling element (7-1 b) and a second sampling element (7-2 b); the circuit breaker further comprises a through pole circuit arranged in the shell, wherein the through pole circuit comprises a through pole wiring board (1 b); the first sampling element (7-1 b) is connected with the fixed contact (8-2 b), and the second sampling element (7-2 a) is connected with the through electrode wiring board (1 b); the overload protection mechanism (7 a) comprises a bimetallic strip (7-1 a) in driving fit with the operating mechanism (4 a), and the bimetallic strip (7-1 a) is connected with the fixed contact (8-2 a).

11. The circuit breaker according to claim 10, characterized in that: the first partition board (1-2 a) comprises a partition board avoiding hole which is used for avoiding the first sampling element (7-1 b) and is positioned on the peripheral side wall of the arc striking channel (9 a) of the first partition board (1-2 a), and the first sampling element (7-1 b) is positioned in the partition board avoiding hole; the second sampling element (7-2 b) is located between the side wall of the first partition (1-2 a) and the side wall of the base (1-1 a).