circuit breaker

Abstract

The utility model relates to the field of low voltage apparatus, concretely relates to a circuit breaker, its length direction, width direction and height direction are direction d1, direction d2 and direction d3 respectively, the circuit breaker includes first casing, the second casing of setting in first casing inside and the electric reclosing mechanism, thermomagnetic system, operating mechanism, contact mechanism and arc extinguishing mechanism that all set up in second casing, the second casing includes the upper shell and lower shell that set up as along direction d3 opposite split, the lower shell includes m set up as along direction d3 respectively with the upper shell opposite split sub -casing body, m greater than or equal to 2, the circuit breaker of the utility model, it is more easily assembled and the assembly efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device used to disconnect and connect power supply and load circuits, and to cut off the circuit in the event of a circuit fault to prevent the accident from escalating, thereby ensuring the safe operation of the load circuit. Among them, the plug-in type 1U circuit breaker is a commonly used circuit breaker, characterized by convenient wiring and small space occupation. However, existing plug-in circuit breakers have the following problems:

[0003] A circuit breaker housing is generally composed of two half-shells that are joined together. Each half-shell is an integral component. During assembly, the circuit breaker components are installed into one half-shell as a base. Due to dimensional errors between the components and the circuit breaker housing, it is often difficult to install the other half-shell. Utility Model Content

[0004] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker that is easier to assemble and has high assembly efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit breaker has a length direction of d1, a width direction of d2, and a height direction of d3, respectively. The circuit breaker includes a first housing, a second housing disposed inside the first housing, and an electric reclosing mechanism, a thermomagnetic system, an operating mechanism, a contact mechanism, and an arc extinguishing mechanism, all disposed within the second housing. The second housing includes an upper housing and a lower housing that are configured to be joined relative to each other along the direction of d3. The lower housing includes m sub-housings that are respectively joined relative to the upper housing along the direction of d3, where m ≥ 2.

[0007] Furthermore, the lower shell includes two sub-shells arranged sequentially along direction d1, namely a front sub-shell and a rear sub-shell.

[0008] Furthermore, the operating mechanism includes a first rotating shaft structure, a transmission link, and a second rotating shaft structure that are driven and cooperate with the electric reclosing mechanism. The first rotating shaft structure is connected to the second rotating shaft structure through the transmission link. The contact mechanism includes a moving contact and a stationary contact that are used in conjunction. The moving contact is connected to the second rotating shaft structure.

[0009] The electric reclosing mechanism and the first rotating shaft structure are both arranged in the space between the front sub-shell and the upper shell; the second rotating shaft structure, the contact mechanism and the arc extinguishing mechanism are all arranged in the space between the rear sub-shell and the upper shell; the transmission link is configured to extend from the space between the front sub-shell and the upper shell to the space between the rear sub-shell and the upper shell.

[0010] Furthermore, the thermomagnetic system includes a thermal tripping mechanism and a magnetic tripping mechanism. The thermal tripping mechanism includes a bimetallic strip, which is configured to extend from the space between the front sub-shell and the upper shell to the space between the rear sub-shell and the upper shell. The magnetic tripping mechanism is disposed in the space between the rear sub-shell and the upper shell.

[0011] Furthermore, the electric reclosing mechanism includes a motor and a gear set, with the motor engaging with the operating mechanism via the gear set; the output shaft axis of the motor and the rotation shaft axis of each gear in the gear set are both parallel to direction d3; the rotation shaft axes of the first and second shaft structures are both parallel to direction d3.

[0012] Furthermore, both the upper and lower shells are provided with multiple material reduction openings.

[0013] Furthermore, the circuit breaker also includes at least one set of busbar clamps, which are respectively disposed at one end of the circuit breaker in direction d1; the operating mechanism, contact mechanism, arc extinguishing mechanism and busbar clamps are arranged sequentially along direction d1; each set of busbar clamps is disposed between the side wall of the first housing and the second housing, and the side wall of the first housing is provided with louver structures that correspond to and cooperate with each set of busbar clamps.

[0014] Furthermore, the circuit breaker includes two sets of busbar clamps arranged side by side at intervals along direction d3; the sidewalls of the first housing 100 opposite to each set of busbar clamps along direction d3 are provided with louver structures; the size of the first housing along direction d2 is greater than the size along direction d3.

[0015] Furthermore, the circuit breaker also includes an operating element and a terminal block assembly, both disposed at one end of the circuit breaker in direction d1; the operating element and the terminal block assembly are arranged side by side in direction d3; the operating element is a button that is slidably disposed in the first housing in direction d1 and located between the side wall of the first housing and the terminal block assembly; at least a portion of the terminal block assembly is located in the first housing and is arranged sequentially with the second housing in direction d1, and the terminal block assembly includes a terminal block and a terminal block disposed in the terminal block.

[0016] Furthermore, the terminal block includes a terminal block body and a support frame; the terminal block is disposed within the terminal block body; the terminal block body includes a wiring interface and wiring holes disposed on the wiring interface and respectively cooperating with each of the terminal blocks; in the direction d3, the wiring interface is located on one side of the support frame, and the operating component is located on the other side of the support frame; the support frame and the second housing are respectively located on both sides of the terminal block body in the direction d1; the support frame is provided with a sliding hole, and at least one supporting rib extending along the direction d1 and connected at both ends to the support frame and the terminal block body respectively is provided in the sliding hole; the operating component includes a button body and a guide side edge disposed at one end of the button body; at least a portion of the button body is always located between the side wall of the terminal block body and the first housing; a sliding shoulder is provided on the outer side of each end of the guide side edge, and at least one side edge groove is provided in the middle of the guide side edge; the guide side edge is inserted into the sliding hole, the two sliding shoulders are respectively slidably engaged with a pair of sides of the support frame, and the side edge groove is slidably engaged with the supporting rib one-to-one.

[0017] Furthermore, the terminal block includes a terminal block groove disposed on the side of it facing the operating member, and the operating member is slidably disposed in the terminal block groove along direction d1.

[0018] Furthermore, the terminal block groove is configured to extend along direction d1 from one side of the support frame to one side of the terminal block body.

[0019] Furthermore, the terminal block has a temperature measuring groove at one end facing the second housing; the circuit breaker also includes a first circuit board disposed in the second housing, the first circuit board including a temperature measuring finger and a temperature measuring element disposed on the temperature measuring finger, the free end of the temperature measuring finger being inserted into the temperature measuring groove.

[0020] Furthermore, the circuit breaker also includes a first connecting plate, which is used to cooperate with the corresponding wiring terminal and to be electrically connected to the contact mechanism; the thermal tripping mechanism of the thermomagnetic system includes a bimetallic strip, an adjusting screw and a limiting member, one end of the bimetallic strip is directly fixedly connected to the first connecting plate, and the other end is provided with a bimetallic hole and inserted into the limiting member, the bimetallic strip and the limiting member remain relatively stationary, the limiting member is provided with a limiting member hole opposite to the bimetallic hole, the diameter of the bimetallic hole is larger than that of the limiting member hole, the adjusting screw passes through the limiting member hole and the bimetallic hole and is threadedly engaged with the limiting member hole.

[0021] Furthermore, the first connecting plate includes a first main board, a first terminal block, and a first support plate; one end of the first terminal block is connected to the first main board and the other end is inserted into the terminal block to cooperate with the corresponding terminal block; the first support plate is bent and connected to the first main board; one end of the bimetallic strip is fixedly connected to the first support plate; the first main board is located between the side wall of the first housing and the second housing in the direction d3; and the plane where the first support plate is located is perpendicular to the direction d2.

[0022] Furthermore, the first terminal block has an L-shaped structure, including a terminal block mating part and a terminal block connecting part. The two ends of the terminal block connecting part are bent and connected to the first main board and the terminal block mating part, respectively. The plane of the terminal block mating part is parallel to the plane of the first main board and is used to insert into the terminal block to mate with the corresponding terminal. The first connecting plate also includes a first connecting finger connected to the first main board. The circuit breaker also includes a second circuit board, which is disposed in the direction d2 between the side wall of the first housing and the second housing. The second circuit board includes a first power-taking terminal, which is electrically connected to the first connecting finger.

[0023] Furthermore, the arc-extinguishing mechanism includes a moving contact arc-initiating plate, an arc-extinguishing chamber, and a stationary contact arc-initiating plate; in the direction d2, the moving contact arc-initiating plate and the stationary contact arc-initiating plate are respectively located on both sides of the arc-extinguishing chamber; the contact mechanism includes a moving contact and a stationary contact that cooperate with each other; the stationary contact arc-initiating plate is used to cooperate with the stationary contact, and the moving contact arc-initiating plate is used to cooperate with the moving contact; the moving contact includes a moving contact bridge and a moving contact point, one end of the moving contact bridge is connected to the operating mechanism, the moving contact point is disposed on the other end of the moving contact bridge, and the moving contact bridge has a moving contact hook at that end, the moving contact hook is used to cooperate with the moving contact arc-initiating plate when the moving contact is in the open position.

[0024] Furthermore, the second rotating shaft structure includes a second rotating shaft rotatably mounted on the second housing, and a jump fastener and a locking fastener respectively rotatably mounted on the second rotating shaft and engaged with each other; the transmission link is rotatably connected to the jump fastener via a connecting shaft; the moving contact includes a moving contact bridge and a moving contact, the middle of the moving contact bridge is rotatably mounted on the second rotating shaft, one end is provided with a moving contact and the other end is provided with a limiting hook; the circuit breaker also includes a contact torsion spring, the contact torsion spring is sleeved on the rotating shaft of the moving contact bridge, one spring arm engages with the second rotating shaft and the other spring arm engages with the limiting hook.

[0025] Furthermore, the second rotating shaft structure includes a second rotating shaft rotatably mounted on the second housing, and a jump fastener and a locking fastener respectively rotatably mounted on the second rotating shaft and engaged with a snap fastener; the transmission link is rotatably connected to the jump fastener via a connecting shaft; the second rotating shaft is provided with a rotating shaft clearance groove for avoiding the connecting shaft at one end facing the second rotating shaft.

[0026] Furthermore, the second housing also includes a second housing clearance groove disposed on its outer side wall; the circuit breaker also includes a second circuit board disposed parallel to the second housing along direction d2, the second circuit board being located between the side walls of the second housing and the first housing in direction d2; the second housing clearance groove is opposite to the second circuit board along direction d2, and is used to avoid some components of the second circuit board.

[0027] Furthermore, the arc extinguishing mechanism includes an arc extinguishing chamber; the second housing has an independent arc extinguishing cavity for accommodating the arc extinguishing chamber; in the direction d1, one end of the arc extinguishing cavity is engaged with the contact mechanism and is opposite to the arc inlet end of the arc extinguishing chamber, and the other end of the arc extinguishing cavity is provided with an exhaust port that is engaged with the exhaust end of the arc extinguishing chamber; multiple weight reduction grooves are provided on the outer side surface of the side wall of the arc extinguishing cavity opposite to the exhaust end of the arc extinguishing chamber.

[0028] The circuit breaker of this utility model has a second housing structure that can avoid or reduce the possibility that the lower housing and the upper housing cannot be assembled together due to the processing errors of various components (circuit breaker housing, electric reclosing mechanism, operating mechanism, etc.). Moreover, each sub-housing of the lower housing can be assembled with the upper housing in stages, improving the flexibility of assembly.

[0029] Furthermore, the reduced-material opening reduces the amount of raw materials required for the second housing, which helps lower production costs, and also ensures good air permeability of the second housing, which is beneficial for heat dissipation. The louver structure improves the heat dissipation efficiency at the busbar clamp and also helps dissipate heat from inside the circuit breaker.

[0030] In addition, the supporting ribs improve the support effect of the support frame on the operating components, ensuring that the operating components can work stably and reliably.

[0031] Furthermore, the bimetallic strip is directly fixed to the first connecting plate, which, compared with the prior art, eliminates the need for a thermal element used to fix the bimetallic strip to the circuit breaker housing, simplifying the structure and saving manufacturing costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the circuit breaker of this utility model;

[0033] Figure 2 This is an exploded view of the circuit breaker of this utility model;

[0034] Figure 3 This is a schematic diagram of the first structure of the circuit breaker of this utility model with the first housing removed;

[0035] Figure 4 This is a utility model Figure 3 An enlarged structural diagram of part a;

[0036] Figure 5 This is an exploded view of the circuit breaker of this utility model with the first housing removed;

[0037] Figure 6 This is a projected view of the circuit breaker of this utility model, with the projection direction being direction d3;

[0038] Figure 7 This is an exploded view of the circuit breaker housing of this utility model;

[0039] Figure 8 This is a projected view of the upper and lower shells of this utility model, with the projection direction being direction d3;

[0040] Figure 9 This is an exploded view of the lower shell of this utility model;

[0041] Figure 10 This is an exploded view of the terminal block assembly and operating components of this utility model;

[0042] Figure 11 This is a schematic diagram of the terminal block assembly of this utility model from two different perspectives;

[0043] Figure 12 This is a schematic diagram of the structure of the operating component of this utility model;

[0044] Figure 13 This is a schematic diagram of the structure of the terminal block assembly and the first circuit board of this utility model;

[0045] Figure 14 This is a utility model Figure 13 An enlarged structural diagram of part b;

[0046] Figure 15 This is a structural schematic diagram of the first connecting plate and the overload protection mechanism of this utility model in the assembled state;

[0047] Figure 16 This is a first structural schematic diagram of the stationary contact, shunt, and magnetic tripping mechanism of this utility model in the assembled state;

[0048] Figure 17 This is a second structural schematic diagram of the stationary contact, shunt, and magnetic tripping mechanism of this utility model in the assembled state;

[0049] Figure 18 This is an exploded view of the operating components and protective structure of this utility model;

[0050] Figure 19 This is a structural schematic diagram of the protective component of this utility model;

[0051] Figure 20 This is a structural schematic diagram of the linkage component of this utility model;

[0052] Figure 21 This is a schematic diagram of the structure of the first spring of this utility model;

[0053] Figure 22This is a partial view of the circuit breaker of this utility model, showing the assembly relationship of the magnetic tripping mechanism, stationary contact, stationary contact arc-starting plate, arc-extinguishing chamber and lower shell. Sub-figure (221) is a three-dimensional view, and sub-figure (222) is an orthogonal projection view with the projection direction as direction d3.

[0054] Figure 23 This is a partial view of the second housing of the present invention, showing the structure of the limiting stage;

[0055] Figure 24 This is a schematic diagram of the structure of the first and second circuit boards of this utility model;

[0056] Figure 25 This is a projected view of the circuit breaker of this utility model, with the projection direction being direction d2;

[0057] Figure 26 This is a cross-sectional view of the circuit breaker of this utility model, showing the assembly relationship of the operating components, the protective structure, and the first housing;

[0058] Figure 27 This is another exploded view of the circuit breaker of this utility model;

[0059] Figure 28 This is the utility model Figure 1 An enlarged view of part b;

[0060] Figure 29 This is a schematic diagram of the second rotating shaft structure of this utility model. Sub-figure (291) shows the assembly relationship of the second rotating shaft, the contact torsion spring and the moving contact. Sub-figure (292) shows the assembly relationship of the second rotating shaft, the jump fastener, the locking fastener, the jump fastener and the transmission link.

[0061] Explanation of reference numerals in the attached figures

[0062] First housing 100, first half-shell 101, second half-shell 102, first louver structure 103, second louver structure 104, first socket 111, connector socket 112, second socket 113, side limiting rib 114, end limiting rib 115, spring seat 116.

[0063] Protective structure 120, protective component 121, protective component body 1210, protective boss 1211, protective component limiting foot 1212, protective component moving arm 1213, protective component moving groove 1214, protective component spring groove 1215, protective component mating shoulder 1216, linkage component 122, linkage component body 1220, linkage component driving groove 1221, linkage component moving part 1222, first spring post 1223, second spring post 1224, linkage component clearance notch 1225, linkage component driving arm 1226, first spring 123, single torsion spring 1230, spring connecting rod 1231, spiral body 1232, first spring arm 1233, second spring arm 1234, second spring 124;

[0064] First connecting plate 130, first main board 131, first terminal board 132, first support plate 133, first conductive plate 134, first connecting finger 135;

[0065] First circuit board 140, temperature measuring finger 141, temperature measuring element 142;

[0066] Second circuit board 145, first power terminal 146, second power terminal 147, connector 148;

[0067] Second connecting board 150, second main board 151, second terminal board 152;

[0068] Shunt 160, first board 161, second board 162, manganin resistor 163, third board 164, front pin 165, rear pin 166, mounting lug 167, precision adjustment notch 168, shunt mounting hole 169, fourth board 170.

[0069] Instruction mechanism 180;

[0070] Second shell 200, upper shell 201, lower shell 202, front sub-shell 203, rear sub-shell 204, arc extinguishing cavity 205, first opening 206, second opening 207, third opening 208, fourth opening 209, fifth opening 210, sixth opening 211, seventh opening 212, eighth opening 213, ninth opening 214, limiting platform 215, front sub-shell mating hole 216, rear sub-shell mating protrusion 217, front sub-shell mating groove 218, rear sub-shell mating boss 219, upper shell support part 220, lower shell support part 221, first notch 222, first limiting surface 223, second limiting surface 224, third limiting surface 225, arc ignition plate baffle surface 226, arc ignition plate limiting structure 227, second shell clearance groove 228, material reduction groove 229;

[0071] Operating component 300, button body 301, guide side rim 302, sliding shoulder 303, side rim groove 304, indicator hole 305, button connecting part 306, unlocking boss 307, stop 308;

[0072] Terminal assembly 400, terminal 401, terminal body 402, first terminal cavity 403, second terminal cavity 404, wiring interface 405, first wiring hole 406, second wiring hole 407, first operating hole 408, second operating hole 409, support frame 410, terminal slide 411, support rib 412, sliding hole 413, clearance notch 414, first connecting plate insertion hole 415, second connecting plate insertion hole 416, support platform 418, temperature measuring groove 419, terminal cover 420, cover connecting screw 421, terminal 422, support frame side 423, support frame crossbeam 424;

[0073] First busbar clamp 451, second busbar clamp 452;

[0074] Busbar clamp bracket 500;

[0075] Electric reclosing mechanism 600, electric motor 601, gear set 602;

[0076] Thermomagnetic system 700;

[0077] The thermal release mechanism 710, bimetallic strip 711, adjusting screw 712, limiting component 713, rivet 714, and cover 715;

[0078] Magnetic tripping mechanism 720, bracket 721, magnetic yoke 722, armature 723, armature shaft 724, armature reset component 725, armature trigger finger 726, limit gap 727;

[0079] Operating mechanism 800, first rotating shaft structure 810, transmission link 820, connecting shaft 821, second rotating shaft structure 830, second rotating shaft 831, jump fastener 832, locking fastener 833, rotating shaft clearance groove 834, contact torsion spring 835, operating link 840;

[0080] Contact mechanism 900, moving contact 901, intermediate plate 902, moving contact bridge 903, limit hook 904, stationary contact 905, stationary contact bridge 906, stationary contact point 907;

[0081] Arc extinguishing mechanism 910, arc extinguishing chamber 911, stationary contact arc ignition plate 912, moving contact arc ignition plate 913, arc ignition plate head plate 914, arc ignition plate mating structure 915, first mating plate 916, second mating plate 917, third mating plate 918, arc ignition plate tail plate 919.

[0082] Heat insulation sheet 920. Detailed Implementation

[0083] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0084] The circuit breaker of this utility model is preferably a plug-in type circuit breaker.

[0085] The circuit breaker of this utility model is preferably a 1U circuit breaker.

[0086] The circuit breaker of this utility model is preferably a circuit breaker for interrupting direct current.

[0087] like Figure 1-28 The diagram shows an embodiment of the circuit breaker of this utility model.

[0088] The circuit breaker of this embodiment is a 1U plug-in circuit breaker for interrupting DC current. It includes a circuit breaker housing and a first-pole circuit and a second-pole circuit disposed within the housing. The first-pole circuit is a negative circuit, including a break point that can be controlled to close and open (e.g., a break point composed of a moving contact and a stationary contact that can be opened and closed). The first-pole circuit is connected and disconnected by closing and opening the break point. The second-pole circuit is a positive circuit, a direct-continuity circuit, meaning there is no break point in the second-pole circuit, and it remains in a continuous state. In actual use, the two ends of the first-pole circuit are used to connect the negative conductor on the power supply side and the negative conductor on the load side, respectively. The two ends of the first-pole circuit are respectively provided with terminals for connecting the corresponding conductors. The two ends of the second-pole circuit are used to connect the positive conductor on the power supply side and the positive conductor on the load side, respectively. The two ends of the second-pole circuit are also provided with terminals for connecting the corresponding conductors. The conductors can be flexible wires, rigid wires, copper busbars, etc.

[0089] like Figure 1-3 As shown in Figures 5, 6, 11, 13, 17, and 27, the circuit breaker in this embodiment has directions d1, d2, and d3 in its length, width, and height directions, respectively. Directions d1, d2, and d3 are perpendicular to each other. The length, width, and height directions of the circuit breaker housing are also directions d1, d2, and d3. The dimension of the circuit breaker housing in the length direction (i.e., the dimension of the circuit breaker housing along direction d2 / the length of the circuit breaker housing) is greater than the dimension of the circuit breaker housing in the height direction (i.e., the dimension of the circuit breaker housing along direction d3 / the height of the circuit breaker housing).

[0090] like Figure 2 , 7As shown in Figure 27, the circuit breaker housing includes a first housing 100, and both the first pole circuit and the second pole circuit are disposed within the first housing 100. Further, the first housing 100 includes a first half-shell 101 and a second half-shell 102 configured to be fitted together, i.e., the first half-shell 101 and the second half-shell 102 are fitted together to form the first housing 100. Further, the first half-shell 101 and the second half-shell 102 are fitted together relative to each other along direction d2 or direction d3.

[0091] Specifically, in the circuit breaker of this embodiment, the first half-shell 101 and the second half-shell 102 are joined together relative to each other along direction d3.

[0092] like Figure 1-3 As shown in Figures 5, 6, and 29, the first pole circuit includes an operating element 300, an operating mechanism 800, and a contact mechanism 900. The contact mechanism 900 includes a moving contact 901 and a stationary contact 905 that work together. The operating element 300 is connected to the operating mechanism 800 in a transmission manner, and the operating mechanism 800 is connected to the moving contact 901. The operating element 300 drives the moving contact 901 to move through the operating mechanism 800, thereby closing and opening with the stationary contact 905, thus connecting and disconnecting the first pole circuit.

[0093] Specifically, the operating element 300 is a button that is slidably disposed in the first housing 100. The operating element 300 switches between the button closed position and the button open position by reciprocating along the direction d1, thereby driving the circuit breaker to close and open.

[0094] Specifically, the operating mechanism 800 can be implemented using existing technology, such as a conventional four-bar linkage operating mechanism, which includes a first rotating shaft structure 810 and a second rotating shaft structure 830 respectively rotatably mounted on the circuit breaker housing, a transmission link 820, and an operating link 840; the second rotating shaft structure 830 includes a locking element 833 and a tripping element 832 respectively rotatably mounted and engaging; the operating member 300 is drivenly connected to the first rotating shaft structure 810 via the operating link 840, and the first rotating shaft structure 810 is drivenly connected to the tripping element 832 via the transmission link 820; the second rotating shaft structure 830 is connected to the moving contact 901. The axial directions of the first rotating shaft structure 810 and the second rotating shaft structure 830 are both parallel to direction d3; the axial directions of the locking element 833 and the tripping element 832 are both parallel to direction d3. The operating component 300 includes a button connection portion 306 disposed at one end, which is connected to the first rotating shaft structure 810 via an operating linkage 840. Further, the second rotating shaft structure 830 includes a second rotating shaft 831 rotatably disposed on the second housing 200, with a locking element 833 and a skipping element 832 rotatably disposed on the second rotating shaft 831. The axial directions of the second rotating shaft 831, the locking element 833, and the skipping element 832 are all parallel to direction d3; the moving contact 901 is disposed on the second rotating shaft 831. Furthermore, the transmission link 820 is rotatably connected to the jump fastener 832 via the connecting shaft 821; the second rotating shaft 831 is provided with a rotating shaft clearance groove 834 for avoiding the end of the connecting shaft 821 facing the second rotating shaft 831. The transmission link 820, the jump fastener 832, and the second rotating shaft 831 are arranged in sequence. In order to ensure a reliable connection between the transmission link 820 and the jump fastener 832, one end of the connecting shaft 821 passes through the transmission link 820 and the jump fastener 832 in sequence and protrudes on one side of the jump fastener 832. The rotating shaft clearance groove 834 avoids interference between the connecting shaft 821 and the second rotating shaft 831 when the jump fastener 832 rotates; the rotating shaft clearance groove 834 is preferably an arc-shaped groove that matches the movement trajectory of the connecting shaft 821; the connecting shaft 821 is preferably a rivet or the transmission link 820 and the connecting shaft 821 are an integral structure. Furthermore, the transmission link 820, the jump fastener 832, and the second rotating shaft 831 are arranged sequentially along direction d3.

[0095] Specifically, the moving contact 901 includes a moving contact bridge 903 and a moving contact. The moving contact bridge 903 is rotatably mounted on the second rotating shaft 831 at its center, with a moving contact at one end and a limiting hook 904 at the other end. The circuit breaker in this embodiment also includes a contact torsion spring 835, which is sleeved on the rotating shaft of the moving contact bridge 903. One spring arm engages with the second rotating shaft 831, and the other spring arm engages with the limiting hook 904. The contact torsion spring 835 provides an overtravel force to the moving contact 901, ensuring reliable closure between the moving contact 901 and the stationary contact 905. The moving contact bridge 903 and the limiting hook 904 are preferably an integral structure. The rotation axes of the moving contact bridge 903 and the second rotating shaft 831 are preferably aligned.

[0096] like Figure 2 , 3 As shown in Figures 5, 6, and 15-17, the first pole circuit also includes a thermomagnetic system 700. The thermomagnetic system 700 is driven to cooperate with the operating mechanism 800, and is used to drive the operating mechanism 800 to trip when a short-circuit fault (i.e., a short-circuit current exists in the circuit where the circuit breaker is located) and an overload fault (i.e., an overload current exists in the circuit where the circuit breaker is located and lasts for a certain period of time), thereby causing the moving contact 901 and the stationary contact 905 to disconnect. Furthermore, the thermomagnetic system 700 is driven to cooperate with the locking member 833, so that when a short-circuit fault and an overload fault occur in the circuit where the circuit breaker is located, the locking member 833 is driven to rotate to disengage from the locking member 833, thereby causing the circuit breaker to trip and open. Furthermore, the thermomagnetic system 700 includes a thermal tripping mechanism 710 and a magnetic tripping mechanism 720, which are respectively driven and engaged with the locking member 833. It should be noted that "driven engagement" can be either a direct drive engagement—that is, the two structures in the drive engagement are driven through direct contact—or an indirect drive engagement—that is, the two structures in the drive engagement are driven and engaged through an intermediate drive component. The thermal tripping mechanism 710 is used to drive the locking member 833 to rotate when an overload fault occurs in the circuit where the circuit breaker is located, thereby releasing the locking member 833 from the tripping member 832. The magnetic tripping mechanism 720 is used to drive the locking member 833 to rotate when a short circuit fault occurs in the circuit where the circuit breaker is located, thereby releasing the locking member 833 from the tripping member 832.

[0097] Specifically, such as Figure 5 , 6As shown in Figure 15, the thermomagnetic system 700 also includes a traction rod, which is preferably rotatably mounted. The thermal trip mechanism 710 drives the locking member 833 to rotate via the traction rod, thereby disengaging the locking member 833 from the tripping member 832. That is, when an overload fault occurs in the circuit where the circuit breaker is located, the thermal trip mechanism 710 drives the traction rod to rotate, which in turn drives the locking member 833 to rotate, thereby disengaging the locking member 833 from the tripping member 832. Further, the thermal trip mechanism 710 includes a bimetallic strip 711, one end of which is fixed and serves as the bimetallic strip mounting end, and the other end is used for transmission engagement with the locking member 833 (specifically, for transmission engagement with the locking member 833 via the traction rod) and serves as the bimetallic strip driving end. Furthermore, the thermal release mechanism 710 also includes an adjusting screw 712 and a limiting member 713. The bimetallic strip drive end is provided with a double metal hole and is inserted into the limiting member 713. The bimetallic strip 711 and the limiting member 713 remain relatively stationary, that is, the bimetallic strip 711 and the limiting member 713 will not move relative to each other or will only have negligible relative movement. The limiting member 713 is provided with a limiting hole opposite to the double metal hole. The diameter of the double metal hole is larger than the diameter of the limiting hole. The adjusting screw 712 passes through the limiting hole and the double metal hole and is threaded into the limiting hole. When the adjusting screw 712 is turned by external force, the limiting member 713 and the bimetallic strip 711 are limited and prevented from rotating with the adjusting screw 712, thereby adjusting the distance between the adjusting screw 712 and the traction rod. The installation method of the adjusting screw 712, the limiting member 713 and the bimetallic strip 711 is simpler in structure and easier to manufacture than the existing method of setting the adjusting screw on the circuit breaker housing; the diameter of the bimetallic hole is larger than the diameter of the limiting member hole, so that the adjusting screw 712 will not be interfered with by the bimetallic strip 711 when it is turned.

[0098] Specifically, such as Figure 5 , 16As shown in Figure 17, the magnetic release mechanism 720 is a snap-action electromagnetic mechanism. Further, the magnetic release mechanism 720 includes a cooperating magnetic yoke 722 and armature 723, an armature reset member 725, and an intermediate plate 902. The magnetic yoke 722 has a U-shaped structure, with a pair of yoke arms spaced apart relative to each other along direction d3. The intermediate plate 902 is embedded in the middle of the U-shaped structure of the magnetic yoke 722 and connected in series in the first pole circuit (the intermediate plate 902 is connected in series between the stationary contact 905 and the shunt 160). The armature 723 is rotatably disposed and used for transmission cooperation with the locking member 833 of the operating mechanism 800. The armature reset member 725 acts on the armature 723, giving it a tendency to separate from the magnetic yoke 722. When a short-circuit fault occurs in the circuit where the circuit breaker is located, the armature 723 is attracted by the magnetic yoke 722, causing the armature 723 to drive the operating mechanism 800 to trip, while the armature reset member 725 stores energy. After the short-circuit current in the circuit breaker of this embodiment disappears, the armature reset member 725 releases energy, driving the armature 723 to rotate and separate from the magnetic yoke 722. Furthermore, the magnetic yoke 722 is fixedly connected to the intermediate plate 902. Furthermore, the magnetic release mechanism 720 also includes a bracket 721 and an armature shaft 724. The magnetic yoke 722 and the armature 723 are both disposed within the bracket 721. The bracket 721 includes a bracket base plate, bracket side plates, and a bracket limiting part. The two ends of the bracket base plate are bent and connected to two sets of bracket side plates respectively. The two sets of bracket side plates are arranged at intervals along the direction d3. The armature 723 is rotatably disposed on the two sets of bracket side plates through the armature shaft 724. The bracket base plate, the U-shaped base plate of the magnetic yoke 722, and the intermediate plate 902 are stacked and fixedly connected in sequence. At least one set of bracket side plates is provided with a bracket limiting part. The bracket limiting part is used to cooperate with the limiting part to limit the stopping position of the armature 723 under the action of the armature reset member 725. That is, when the armature reset member 725 drives the armature 723 to rotate and separate from the magnetic yoke 722, the armature 723 rotates under the action of the armature reset member 725 until it abuts against the bracket limiting part and stops rotating. The bracket 721 enables modular assembly of the magnetic yoke 722, armature 723, and armature shaft 724, improving assembly efficiency. Furthermore, the armature reset component 725 is a torsion spring, sleeved on the armature shaft 724. One set of spring arms engages with the magnetic yoke 722, the intermediate plate 902, or the bracket 721 for limiting, while the other set of spring arms engages with the armature 723. It should be noted that the armature reset component 725 can also be a tension spring, etc. One end of each bracket side plate is bent and connected to the bracket base plate, and the other end is provided with a bracket limiting part. The two bracket limiting parts are bent towards each other and spaced apart from the bracket base plate. Furthermore, the magnetic release mechanism 720 also includes at least one magnetizing plate. The magnetizing plate and the magnetic yoke 722 are respectively disposed on both sides of the bracket side plate. The magnetizing plate can increase the magnetic field strength of the magnetic yoke 722, ensuring the operational performance of the magnetic release mechanism 720.

[0099] like Figure 5 and 6As shown, the circuit breaker in this embodiment also includes an electric reclosing mechanism 600, which is driven by the operating mechanism 800 to realize the automatic closing and opening of the circuit breaker.

[0100] Specifically, the electric reclosing mechanism 600 includes a motor 601 and a gear set 602. The motor 601 is in transmission cooperation with the operating mechanism 800 (specifically, the first rotating shaft structure 810) through the gear set 602. The gear set 602 includes multiple gears, and the axial direction of at least some of the gear shafts is parallel to direction d3. Preferably, the axial direction of the output shaft of the motor 601 and the axial direction of the rotating shafts of each gear are both parallel to direction d3.

[0101] like Figure 6 , 22 As shown in Figure 29, the circuit breaker in this embodiment also includes an arc extinguishing mechanism 910, which works in conjunction with the contact mechanism 900 to extinguish the electric arc generated by the contact mechanism 900.

[0102] Specifically, the arc-extinguishing mechanism 910 includes an arc-extinguishing chamber 911, a stationary contact arc-initiating plate 912, and a moving contact arc-initiating plate 913. The arc-extinguishing chamber 911 includes multiple arc-extinguishing grids, with a maximum of two grids, arranged side-by-side at intervals along direction d2. One end of the stationary contact arc-initiating plate 912 is engaged with and electrically connected to the stationary contact 905, and the other end extends to one side of the arc-extinguishing chamber 911, preferably arranged side-by-side at intervals with the arc-extinguishing grids along direction d2. One end of the moving contact arc-inducing plate 913 is engaged with the moving contact 901, and the other end extends to the other side of the arc-extinguishing chamber 911, preferably arranged side-by-side with the arc-extinguishing grid plate along direction d2; the moving contact arc-inducing plate 913 is disposed on the side of the inlet end of the arc-extinguishing chamber 911 (that is, the end of the arc-extinguishing chamber 911 that is engaged with the contact mechanism 900), and the moving contact arc-inducing plate 913 and the arc-extinguishing chamber 911 are independently arranged or fixedly connected to each other; in this embodiment, the moving contact arc-inducing plate 913 is preferably riveted and fixedly connected to the arc-extinguishing chamber 911 (specifically, the moving contact arc-inducing plate 913 is riveted and fixedly connected to the partition of the arc-extinguishing chamber 911). The moving contact 901 includes a moving contact bridge 903 and a moving contact. One end of the moving contact bridge 903 is connected to the operating mechanism 800, and the moving contact is located on the other end of the moving contact bridge 903. The moving contact bridge 903 is provided with a moving contact hook (not shown in the figure) that cooperates with the moving contact arc-inducing plate 913. When the moving contact 901 is in the open position, the moving contact hook cooperates with the moving contact arc-inducing plate 913 to introduce the electric arc into the arc-extinguishing chamber 911.

[0103] like Figure 6 , 22As shown, an innovation of the circuit breaker in this embodiment is that the arc-extinguishing chamber 911 further includes partitions made of rigid steel cardboard. Two partitions are arranged side-by-side and spaced apart along direction d3, and a pair of sides of each arc-extinguishing grid are fixedly connected to the two partitions respectively. The partitions are made of rigid steel cardboard, which reduces production costs and provides good heat dissipation. Furthermore, the arc-extinguishing chamber 911 also includes a connecting plate disposed between the two partitions. The connecting plate is disposed at one end of the arc-extinguishing chamber 911 and is arranged side-by-side with the arc-extinguishing grid along direction d1. The connecting plate is connected to the two partitions respectively, forming an arc-extinguishing gap between adjacent arc-extinguishing grids. The connecting plate has multiple connecting plate vent holes, which are matched with the arc-extinguishing gaps. The connecting plate is made of rigid steel cardboard. The connecting plate and the partitions are either separate or integrated structures; in this embodiment, the connecting plate and the partitions are preferably integrated structures.

[0104] like Figure 2 , 3 As shown in Figures 5-9, an innovation of the circuit breaker in this embodiment is that the circuit breaker housing further includes a second housing 200, which is disposed within the first housing 100. The electric reclosing mechanism 600, the thermomagnetic system 700, the operating mechanism 800, the contact mechanism 900, and the arc-extinguishing mechanism 910 are all disposed within the second housing 200. The second housing 200 includes an upper housing 201 and a lower housing 202 configured to be assembled opposite each other along direction d3. The lower housing 202 includes m sub-housings configured to be assembled opposite each other to the upper housing 201 along direction d3, where m ≥ 2. When assembling the circuit breaker in this embodiment, the upper housing 201 is used as the mounting base. After the electric reclosing mechanism 600, the thermomagnetic system 700, the operating mechanism 800, the contact mechanism 900, and the arc-extinguishing mechanism 910 are installed in the upper housing 201, the lower housing 202 is then assembled. The structure of the second housing 200 can avoid or reduce the possibility that the lower housing 202 and the upper housing 201 cannot be assembled together due to processing errors of various components (circuit breaker housing, electric reclosing mechanism 600, operating mechanism 800, etc.). Furthermore, the sub-housings of the lower housing 202 can be assembled with the upper housing 201 in stages, improving assembly flexibility. Further, each sub-housing is adjacent to at least one other sub-housing, and each sub-housing is mated with at least one adjacent sub-housing through a sub-housing mating structure; this sub-housing mating structure achieves basic positioning between adjacent sub-housings, improving assembly efficiency.

[0105] Specifically, the lower shell 202 includes two sub-shells arranged sequentially along direction d1, namely a front sub-shell 203 and a rear sub-shell 204. Further, the ends of the front sub-shell 203 and the rear sub-shell 204 connected to each other are respectively the front sub-shell mating end and the rear sub-shell mating end. The sub-shell mating structure includes a front sub-shell mating hole 216 on the front sub-shell mating end and a rear sub-shell mating protrusion 217 on the rear sub-shell mating end, the rear sub-shell mating protrusion 217 being inserted into the front sub-shell mating hole 216 along direction d3; and / or, the sub-shell mating structure includes a front sub-shell mating groove 218 on the front sub-shell mating end and a rear sub-shell mating boss 219 on the rear sub-shell mating end, the rear sub-shell mating boss 219 being embedded into the front sub-shell mating groove 218 along direction d3. The front sub-shell 203 preferably has both a front sub-shell mating hole 216 and a front sub-shell mating groove 218, which are arranged sequentially along direction d2. The front sub-shell mating hole 216 is preferably a circular hole. The rear sub-shell 204 preferably has both a rear sub-shell mating protrusion 217 and a rear sub-shell mating boss 219, which are arranged sequentially along direction d2. The rear sub-shell mating protrusion 217 is preferably a circular protrusion. During assembly, the rear sub-shell 204 is first assembled with the upper shell 201, and then the front sub-shell 203 is assembled with the rear sub-shell 204 and the upper shell 201.

[0106] Specifically, the first rotating shaft structure 810 of the electric reclosing mechanism 600 and the operating mechanism 800 are both arranged in the space between the front sub-shell 203 and the upper shell 201. The second rotating shaft structure 830, the contact mechanism 900, and the arc-extinguishing mechanism 910 are all arranged in the space between the rear sub-shell 204 and the upper shell 201. The transmission link 820 is configured to extend from the space between the front sub-shell 203 and the upper shell 201 to the space between the rear sub-shell 204 and the upper shell 201. The bimetallic strip 711 of the thermal tripping mechanism 710 is configured to extend from the space between the front sub-shell 203 and the upper shell 201 to the space between the rear sub-shell 204 and the upper shell 201. The magnetic tripping mechanism 720 is arranged in the space between the rear sub-shell 204 and the upper shell 201. In the circuit breaker of this embodiment, the components are distributed in the space between the front sub-shell 203 and the upper shell 201 and the space between the rear sub-shell 204 and the upper shell 201, realizing step-by-step assembly, which is beneficial to improve assembly efficiency and reduce the risk of accidentally touching the earlier assembled components when assembling the later assembled components.

[0107] like Figure 5 , 7As shown in Figure 9, an innovation of the circuit breaker in this embodiment is that both the upper shell 201 and the lower shell 202 are provided with multiple material reduction openings. These material reduction openings reduce the raw materials required for the production of the second shell 200, which helps to reduce production costs, and also ensures good air permeability of the second shell 200, which is beneficial for heat dissipation.

[0108] Specifically, the plurality of material reduction openings include a first opening 206, a second opening 207, and a third opening 208 provided on the upper shell 201, and a fourth opening 209, a fifth opening 210, a sixth opening 211, a seventh opening 212, an eighth opening 213, and a ninth opening 214 provided on the lower shell 202. On the orthogonal projection of the second housing 200 perpendicular to direction d3, the third opening 208 is located close to the electric reclosing mechanism 600. The third opening 208 and the electric reclosing mechanism 600 are side by side and partially overlap along direction d2. The first opening 206 and the second opening 207 are located on both sides of the contact mechanism 900 in direction d2. The fourth opening 209, the fifth opening 210, the eighth opening 213 and the ninth opening 214 are arranged around the electric reclosing mechanism 600. The eighth opening 213 and the ninth opening 214 partially overlap with the electric reclosing mechanism 600. The sixth opening 211 and the seventh opening 212 are located on both sides of the contact mechanism 900 in direction d2.

[0109] like Figure 1-3 As shown in Figures 5, 6, 10, and 11, the first electrode circuit further includes a first connection terminal and a second connection terminal respectively disposed at both ends of the first electrode circuit, the first connection terminal and the second connection terminal being used to connect to corresponding external conductors. The second electrode circuit further includes a third connection terminal and a fourth connection terminal respectively disposed at both ends of the second electrode circuit, the third connection terminal and the fourth connection terminal being used to connect to corresponding external conductors.

[0110] Specifically, the first and third connection terminals are both input connection terminals, used to connect to the corresponding input conductors (e.g., power supply side conductor - power supply side negative conductor and power supply side positive conductor), respectively. The second and fourth connection terminals are both output connection terminals, used to connect to the corresponding output conductors (e.g., load side conductor - load side negative conductor and load side positive conductor), respectively. Further, the first connection terminal is a first negative connection terminal, and the second connection terminal is a second negative connection terminal; the third connection terminal is a first positive connection terminal, and the fourth connection terminal is a second positive connection terminal.

[0111] Specifically, both the first and third connecting terminals are busbar clamps, namely a first busbar clamp 451 and a second busbar clamp 452. The two busbar clamps are arranged side by side with intervals along direction d3. Each busbar clamp has a slit extending along direction d2 for the corresponding busbar to be inserted into. The layout of the busbar clamps allows the busbar clamps and busbars to form a larger contact area, thereby reducing the contact resistance between the busbar clamps and busbars. One end of the first housing 100 in direction d1 is provided with a first socket 111 and a second socket 113. The first socket 111 corresponds to the second busbar clamp 452, and the second socket 113 corresponds to the first busbar clamp 451. The negative busbar passes through the first socket 111 and is plugged into the first busbar clamp 451 for electrical connection, and the positive busbar passes through the second socket 113 and is plugged into the second busbar clamp 452 for electrical connection.

[0112] Specifically, the second and fourth connecting terminals are respectively used to insert corresponding external conductors along direction d1 and fix the external conductors therein. For example, both the second and fourth connecting terminals include a wiring frame, a clamping block, and a wiring screw. The external conductor is inserted into the wiring frame, and turning the wiring screw drives the clamping block to move, pressing the external conductor into the clamping block and the wiring frame, or causing the clamping block to release the external conductor. Alternatively, both the second and fourth connecting terminals include a wiring frame and a clamping plate. The clamping plate itself has an elastic structure or is additionally provided with an elastic element that cooperates with the clamping plate. The external conductor is inserted between the clamping plate and the wiring frame and is clamped by the clamping plate. The user uses a tool to press the clamping plate to release the external conductor. It should be noted that the second and fourth connecting terminals are not limited to the above two structures; any existing wiring terminal that can meet the wiring requirements of this application is acceptable.

[0113] like Figure 1-3 As shown in Figures 5 and 28, an innovation of the circuit breaker in this embodiment is that the side wall of the first housing 100 is provided with a louver structure corresponding to each busbar clamp. Further, the two busbar clamps are respectively disposed on both sides of the second housing 200 in direction d3, with each busbar clamp located between the side wall of the second housing 200 and the corresponding side wall of the first housing 100 in direction d3; the side wall of the first housing 100 is provided with a louver structure corresponding to the busbar clamp, which improves the heat dissipation efficiency at the busbar clamp and also facilitates the dissipation of heat inside the circuit breaker; the louver structure corresponding to the first busbar clamp 451 is a first louver structure 103, disposed on the first half-shell 101; the louver structure corresponding to the second busbar clamp 452 is a second louver structure 104, disposed on the second half-shell 102.

[0114] Specifically, the first louver structure 103 includes sub-louvers arranged side-by-side at intervals along direction d2, each sub-louver being opposite to the first busbar clamp 451 along direction d3. The second louver structure 104 includes sub-louvers arranged side-by-side at intervals along direction d2, each sub-louver being opposite to the second busbar clamp 452 along direction d3.

[0115] like Figure 2 , 3 As shown in Figures 5 and 25, the first pole circuit further includes a first connecting plate 130, a first connecting terminal, the first connecting plate 130, a contact mechanism 900, and a second connecting terminal connected in series; the second pole circuit further includes a second connecting plate 150, a third connecting terminal, the second connecting plate 150, and a fourth connecting terminal connected in series.

[0116] Specifically, the first connecting plate 130 includes a first terminal block 132 for cooperating with the second connecting terminal; the second connecting plate 150 includes a second main plate 151 and a second terminal block 152 disposed at one end of the second main plate 151 for cooperating with the fourth connecting terminal, and the other end of the second main plate 151 is electrically connected to the third connecting terminal. The second connecting plate 150 and the third connecting terminal are preferably electrically connected by soldering.

[0117] like Figure 2 , 3 As shown in Figures 5, 6, 15, and 25, an innovation of the circuit breaker in this embodiment is that one end (the bimetallic strip mounting end) of the bimetallic strip 711 of the thermal tripping mechanism 710 is directly fixed to the first connecting plate 130. Compared with the prior art, the direct fixing of the bimetallic strip 711 to the first connecting plate 130 eliminates the need for a heating element to fix the bimetallic strip 711 to the circuit breaker housing, simplifying the structure and saving manufacturing costs. The bimetallic strip 711 is fixedly connected to the first connecting plate 130 by riveting, simplifying assembly and eliminating the screws used in the prior art to connect the heating element and the first connecting plate 130, thus avoiding temperature rise at the screw location and ensuring the reliability and stability of the circuit breaker's thermal tripping performance. Preferably, the bimetallic strip 711 is fixedly connected to the first connecting plate 130 by at least two rivets 714 arranged side-by-side at intervals, preventing the bimetallic strip 711 from rotating relative to the first connecting plate 130 and ensuring that the bimetallic strip 711 is reliably positioned in the working position.

[0118] Specifically, the first connecting plate 130 includes a first main board 131, a first terminal block 132 and a first support plate 133. One end of the first terminal block 132 is connected to the first main board 131 and the other end is used to cooperate with the corresponding first connection terminal. The first support plate 133 is bent and connected to the first main board 131. One end of the bimetallic strip 711 (the bimetallic strip mounting end) is fixedly connected to the first support plate 133.

[0119] Specifically, the first motherboard 131 is located between the sidewalls of the second housing 200 and the first housing 100 in direction d3. The plane of the first support plate 133 is parallel to directions d1 and d3 and perpendicular to direction d2. The plane of the first support plate 133 is opposite to the sidewall of the first housing 100.

[0120] Specifically, the first terminal block 132 is preferably an L-shaped structure, which includes a terminal block mating part and a terminal block connecting part. The two ends of the terminal block connecting part are bent and connected to the first main board 131 and the terminal block mating part, respectively. The plane where the terminal block mating part is located is parallel to the plane where the first main board 131 is located. The terminal block mating part is used to mate with the second connecting terminal.

[0121] Specifically, the first support plate 133 preferably further includes a first conductive plate 134 connected to the first support plate 133. The first support plate 133 and the first conductive plate 134 are coplanar and form an L-shaped flat plate structure. The first support plate 133 and the second support plate 134 respectively form two sides of the L-shaped flat plate structure. The first conductive plate 134 is used for electrical connection with the contact mechanism 900 (the end of the first conductive plate 134 away from the first support plate 133 is preferably electrically connected to the moving contact 901 of the contact mechanism 900 through a flexible connection). The second housing 200 preferably has a first notch 222 for accommodating the first support plate 133 and the first conductive plate 134. Each of the pair of sidewalls of the first notch 222 is provided with a limiting slot extending in the direction d3. The pair of side edges of the L-shaped flat plate structure in the direction d1 are respectively inserted into the two limiting slots. The first notch 222 is provided on one sidewall of the second housing 200 in the direction d2.

[0122] Specifically, the first connecting plate 130 further includes a first connecting finger 135 connected to the first main board 131; the circuit breaker in this embodiment also includes a second circuit board 145; the first connecting finger 135 is used to connect to the first power supply terminal 146 of the second circuit board 145. The first connecting finger 135 and the first main board 131 are preferably coplanar, and the first connecting finger 135 and the first power supply terminal 146 are connected along direction d2. The first connecting finger 135 and the first support plate 133 are preferably connected to a pair of side edges of the first main board 131 in direction d2, and the first terminal block 132 is preferably connected to one side edge of the first main board 131 in direction d1. The first support plate 133, the first terminal block 132 and the first connecting finger 135 are arranged sequentially in direction d2.

[0123] Specifically, the first housing 100 is provided with an adjustment hole and a cover 715. The adjustment hole is matched with the adjustment screw 712, and the cover 715 is detachably installed in the adjustment hole to cover the adjustment hole.

[0124] like Figure 1-3As shown in Figures 5, 10, 11, and 13, the first electrode circuit further includes a terminal block assembly 400. At least a portion of the terminal block assembly 400 is located within the first housing 100. The terminal block assembly 400 includes a terminal block 401 and terminals 422 disposed within the terminal block 401. A portion of the terminals 422 serves as a second connection terminal, and another portion of the terminals 422 serves as a fourth connection terminal. Further, the terminal block assembly 400 and the second housing 200 are sequentially arranged along direction d1. The operating member 300 is located between the terminal block 401 and the sidewall of the first housing 100 in direction d3.

[0125] Specifically, the terminal block assembly 400 includes four terminals 422. Two terminals 422 serve as second connection terminals, arranged side-by-side along direction d2. The other two terminals 422 serve as fourth connection terminals, also arranged side-by-side along direction d2. Along direction d2, the second and fourth connection terminals are alternately arranged, or the two second connection terminals are located on one side of the two fourth connection terminals. Along direction d3, the two second connection terminals are offset to one side relative to the two fourth connection terminals.

[0126] Specifically, the terminal block 401 is provided with a first terminal cavity 403 for accommodating a second connecting terminal and a second terminal cavity 404 for accommodating a fourth connecting terminal.

[0127] Specifically, the terminal block 401 is provided with a first connecting plate insertion hole 415 communicating with the first terminal cavity 403 and a second connecting plate insertion hole 416 communicating with the second terminal cavity 404. The first connecting plate insertion hole 415 is used for the first terminal block 132 of the first connecting plate 130 (specifically, the terminal block mating part of the first terminal block 132) to pass through and mate with the second connecting terminal. The second connecting plate insertion hole 416 is used for the second terminal block 152 of the second connecting plate 150 to pass through and mate with the fourth connecting terminal. The first connecting plate insertion hole 415 and the second connecting plate insertion hole 416 are both provided on one end of the terminal block 401 in direction d1 (i.e., the end of the terminal block 401 near the second housing 200).

[0128] like Figure 10 , 11As shown, an innovation of the circuit breaker in this embodiment is that the first terminal cavity 403 of the terminal block 401 has a first terminal cavity opening for a second connecting terminal to enter, and the second terminal cavity 404 has a second terminal cavity opening for a fourth connecting terminal to enter. The first terminal cavity opening and the second terminal cavity opening are respectively located on two sides of the terminal block 401 in direction d3, that is, the first terminal cavity opening and the second terminal cavity opening are respectively located on a pair of sides of the terminal block 401 in direction d3. This layout of the first and second terminal cavity openings reduces the difficulty of molding the terminal block 401. The terminal block assembly 400 also includes a terminal block cover plate 420, which is located between the operating member 300 and the terminal block 401, separating the first terminal cavity opening from the operating member 300, improving insulation performance and preventing electric shock when the user operates the operating member 300. The terminal block cover plate 420 is fixedly connected to the terminal block 401, preferably by screws or clips.

[0129] like Figure 10-13 As shown, the terminal block 401 includes a terminal block body 402 and a support frame 410. A terminal block 422 is disposed within the terminal block body 402. The terminal block body 402 includes a wiring interface 405 and wiring holes disposed on the wiring interface 405 and corresponding to the wiring terminals 422. An external conductor is inserted into the wiring hole along direction d1. In direction d3, the wiring interface 405 is located on one side of the support frame 410, and the operating member 300 is located on the other side of the support frame 410. The support frame 410 and the second housing 200 are respectively located on both sides of the terminal block body 402 in direction d1. The support frame 410 protrudes outside the first housing 100. The support frame 410 separates the external conductor from the operating member 300, preventing the external conductor from obstructing the movement of the operating member 300 and preventing the external conductor from affecting user operation.

[0130] Specifically, among the wiring holes, the wiring hole that mates with the second connecting terminal is the first wiring hole 406, and the wiring hole that mates with the fourth connecting terminal is the second wiring hole 407.

[0131] Specifically, the wiring interface 405 is also provided with operation holes, which correspond one-to-one with the wiring holes. The user operates the wiring terminal 422 through the operation holes to release the external conductor. Among the operation holes, the operation hole corresponding to the first wiring hole 406 is the first operation hole 408, and the operation hole corresponding to the second wiring hole 407 is the second operation hole 409.

[0132] like Figure 10-13As shown, an innovation of the circuit breaker in this embodiment is that the support frame 410 is provided with a sliding hole 413, and at least one support rib 412 extending along the direction d1 is provided in the sliding hole 413. The two ends of the support rib 412 are respectively connected to the support frame 410 and the terminal block body 402. The operating member 300 includes a button body 301 and a guide side edge 302 provided at one end of the button body 301. A sliding shoulder 303 is provided on the outer side of each end of the guide side edge 302, and at least one side edge groove 304 is provided in the middle of the guide side edge 302. The guide side edge 302 is inserted into the sliding hole 413. The two sliding shoulders 303 are respectively slidably engaged with a pair of sides of the support frame 410, and the side edge groove 304 is slidably engaged with the support rib 412 one-to-one. The support rib 412 improves the support effect of the support frame 410 on the operating member 300, ensuring that the operating member 300 can work stably and reliably.

[0133] Specifically, the guide side rim 302 is inserted into the sliding hole 413 along direction d3, and the sliding shoulder 303 rests on the corresponding side of the support frame 410 along direction d3.

[0134] Specifically, the support frame 410 includes support frame sides 423 and support frame crossbeams 424. The two ends of the support frame crossbeam 424 are bent and connected to one end of each of the two sets of support frame sides 423. The support frame crossbeam 424 is spaced apart from the wiring interface 405 along direction d1. The two sets of support frame sides 423 are spaced apart side-by-side along direction d2, and their other ends are connected to the wiring base 402. The support frame 410 is provided with sliding holes 413, which are formed by the two sets of support frame sides 423 and the support frame crossbeams 424. At least a portion of the button body 301 is always located between the wiring base 402 and the side wall of the first housing 100. Two sliding shoulders 303 are slidably engaged with the two sets of support frame sides 423, and the sliding shoulders 303 extend onto the button body 301 along direction d1. The two ends of the support rib 412 are connected to the support frame beam 424 and the terminal block body 402, respectively; the guide side eaves 302 are provided with at least one side eaves groove 304, and the side eaves groove 304 slides in a one-to-one fit with the support rib 412. The guide side eaves 302 and the terminal block body 402 are in a limiting fit to limit the maximum stroke of the operating member 300 in the closing direction, so as to avoid the operating member 300 being excessively pressed and damaging the circuit breaker.

[0135] Specifically, the support frame beam 424 is provided with a clearance notch 414, which is arranged opposite to the operating component 300 along the direction d1, reducing the degree of obstruction of the operating component 300 by the support frame beam 424 and making it easier for the user to operate the operating component 300.

[0136] Specifically, the terminal block body 402 is located inside the first housing 100 and is sequentially arranged with the second housing 200 along direction d1. The support frame 410 is located outside one end of the first housing 100 along direction d1. The two ends of the support frame beam 424 of the support frame 410 are bent at right angles to the two sets of support frame sides 423, and the three together form a U-shaped structure. The terminal block 401 preferably has a support rib 412, which is located in the middle of the sliding hole 413 along direction d2; the guide side eaves 302 preferably has a side eaves groove 304, which is located in the middle of the guide side eaves 302 along direction d2. It should be noted that when the number of support ribs 412 is ≥2, the support ribs 412 are arranged side by side with intervals along direction d2. The guide side eaves 302 preferably has a limiting fit with the wiring interface 405. The terminal block body 402 is fixedly connected to the first housing 100, and the two are preferably fixed together by screws.

[0137] like Figure 10 , 11 As shown in Figure 13, one innovation of the circuit breaker in this embodiment is that the terminal block 401 includes a terminal block groove 411 on its side facing the operating member 300, in which the operating member 300 is slidably disposed, ensuring that the operating member 300 moves reliably and stably along a predetermined trajectory, and reducing the precision requirements of the first housing 100.

[0138] Specifically, the terminal block groove 411 extends along direction d1 from one side of the support frame 410 to one side of the terminal block body 402, ensuring that the entire operating component 300 is always within the terminal block groove 411, further guaranteeing the reliable and stable movement of the operating component 300. The terminal block cover plate 420 is disposed within the terminal block groove 411 and is stacked with the terminal block body 402 along direction d3. The terminal block cover plate 420 is preferably fixedly connected to the terminal block body 402 by cover plate connecting screws 421.

[0139] like Figure 2-6 As shown, the circuit breaker in this embodiment also includes an indicator mechanism 180 for indicating the opening and closing status of the circuit breaker, and the indicator mechanism 180 is disposed on the operating member 300.

[0140] Specifically, the indicating mechanism 180 includes an indicating element disposed within the operating member 300, and the operating member 300 is provided with an indicating hole 305 that cooperates with the indicating element. The indicating element is preferably rotatably disposed and moves synchronously with the operating member 300, and the indicating element switches between a closed indicating position and a closed indicating position by rotating.

[0141] like Figure 2 , 3As shown in Figures 5, 6, and 24, the circuit breaker in this embodiment further includes a first circuit board 140 and a second circuit board 145, which are connected together. The first circuit board 140 is preferably disposed within the second housing 200, and is preferably used at least for measuring the temperature inside the circuit breaker. The second circuit board 145 is preferably disposed side-by-side with the second housing 200 along direction d2, and is located between the side walls of the second housing 200 and the first housing 100 in direction d2. The second circuit board 145 is preferably used at least for connecting to the motor 601 of the electric reclosing mechanism 600 to control the operation of the electric reclosing mechanism 600, thereby realizing the automatic closing and opening of the circuit breaker. The second circuit board 145 also includes a connector 148; one end of the first housing 100 in direction d1 is provided with a connector socket 112, and the connector socket 112 corresponds to and engages with the connector 148.

[0142] Specifically, the first circuit board 140 and the second circuit board 145 are connected by pin headers and socket headers. The first circuit board 140 includes a first PCB board and pin headers disposed on the first PCB board; the second circuit board 145 includes a second PCB board and socket headers disposed on the second PCB board; the pin headers and socket headers are plugged into each other. Preferably, the plane of the first PCB board and the plane of the second PCB board are perpendicular to each other, the plane of the first PCB board is preferably perpendicular to direction d3, and the plane of the second PCB board is preferably perpendicular to direction d2. The connector 148 is disposed on the second PCB board; the connector socket 112, the first socket 111, and the second socket 113 of the first housing 100 are disposed on one end of the first housing 100 in direction d1, and the first socket 111, the connector socket 112, and the second socket 113 are arranged side by side with intervals in direction d3.

[0143] Specifically, the second circuit board 145 includes a first power-taking terminal 146 that is plugged into and electrically connected to the first connecting board 130 of the first electrode circuit, and a second power-taking terminal 147 that is plugged into and electrically connected to the second connecting board 150 of the second electrode circuit. Both the first power-taking terminal 146 and the second power-taking terminal 147 are disposed on the second PCB board. Further, the first power-taking terminal 146 is plugged into and electrically connected to the first connecting finger 135 of the first connecting board 130; the second power-taking terminal 147 is plugged into and electrically connected to the second main board 151 of the second connecting board 150.

[0144] like Figure 10-13As shown, an innovation of the circuit breaker in this embodiment is that the first circuit board 140 further includes a temperature sensing finger 141, on which a temperature sensing element 142 is provided for detecting the temperature inside the circuit breaker, especially for detecting the temperature during circuit breaker operation. A temperature sensing groove 419 is provided at the end of the terminal block 401 facing the second housing 200, and the free end of the temperature sensing finger 141 is inserted into the temperature sensing groove 419. The terminal block 401 also includes a support platform 418, which is located on one side of the temperature sensing groove 419 in direction d3. The temperature sensing finger 141 rests on the support platform 418 along direction d2, and the temperature sensing element 142 and the support platform 418 are located on opposite sides of the temperature sensing finger 141 in direction d3. The temperature sensing groove 419 reduces the thickness of the side wall of the terminal block 401 facing the second housing 200, allowing the temperature sensing element 142 to be closer to the heating location, resulting in more accurate temperature measurement results. The support platform 418 supports and limits the temperature measuring finger 141, so that the temperature measuring element 142 is kept in the correct working position.

[0145] Specifically, the temperature measuring indicator 141 is part of the first PCB board of the first circuit board 140. The temperature measuring element 142 is an NTC temperature measuring element.

[0146] like Figure 2 , 3 As shown in Figures 5, 6, 16, and 17, the first pole circuit also includes a shunt 160, which is connected in series between the contact mechanism 900 and the first connection terminal.

[0147] Specifically, the second connecting terminal, the first connecting plate 130, the moving contact 901 of the contact mechanism 900, the stationary contact 905 of the contact mechanism 900, the shunt 160 and the first connecting terminal are connected in series.

[0148] like Figure 5 As shown, an innovation of the circuit breaker in this embodiment is that the second housing 200 further includes a second housing clearance groove 228 disposed on its outer side wall; the second housing clearance groove 228 is opposite to the second circuit board 145 along direction d2, and is used to avoid some components of the second circuit board 145—especially components disposed on the side of the second PCB board of the second circuit board 145 facing the second housing 200 and protruding from the side where the second housing 200 is located. The second housing clearance groove 228 helps to improve the compactness of the circuit breaker layout.

[0149] like Figure 2 , 3As shown in Figures 5, 6, 16, and 17, an innovation of the circuit breaker in this embodiment is that the shunt 160 includes a first plate 161, a shunt detection unit, and a fourth plate 170 connected in sequence to the first connection terminal. The shunt detection unit includes a second plate 162, a manganese copper resistor 163, and a third plate 164 arranged and connected in sequence along direction d2, and the shunt detection unit is arranged side-by-side with the second housing 200 along direction d3. The first plate 161 is electrically connected to the stationary contact 905, and the first plate 161 and the second housing 200 are arranged side-by-side and fixedly connected along direction d2. In direction d2, one end of the second plate 162 is bent and connected to the first plate 161, and the other end is connected to the manganese copper resistor 163. The second plate 162 and the third plate 164 are respectively provided with a front pin 165 and a rear pin 166 at one end in direction d1. The other end of the third plate 164 in direction d1 is connected to the fourth plate 170. The front pin 165 and the rear pin 166 are located on the same end of the shunt detection section in direction d1. That is, in direction d1, the second plate 162 is provided with a front pin 165 at one end, the third plate 164 is provided with a rear pin 166 at one end and the other end is connected to the fourth plate 170. The front pin 165 and the rear pin 166 are located on the same end of the shunt detection section. The front pin 165 and the rear pin 166 are used to output detection signals. The manganin resistor 163 has a long strip structure. The end near the fourth plate 170 is the resistor head of the manganin resistor 163, and the end near the front pin 165 and the rear pin 166 is the resistor tail of the manganin resistor 163. The resistor head is set closer to the first plate 161 in direction d2 relative to the resistor tail. The shunt 160 is located outside the second housing 200, providing more installation space, which facilitates the design of the shunt 160 and ensures its accuracy. Furthermore, the inclined arrangement of the manganese copper resistor 163 allows it to have a larger size, which is beneficial for improving sampling accuracy. It also keeps the manganese copper resistor 163 away from the structure of the first plate 161 used for fixed connection with the second housing 200, thus reducing temperature rise. Furthermore, the closing points of the moving contact 901 and the stationary contact 905 (i.e., the positions of the moving contact of the moving contact 901 and the stationary contact of the stationary contact 905 in the closed state) are arranged opposite to the second plate 162 along direction d3, and the closing points of the moving contact 901 and the stationary contact 905 are offset from the manganin resistor 163; that is, on the orthogonal projection of the circuit breaker in direction d3, the closing points of the moving contact 901 and the stationary contact 905 overlap with the second plate 162, but do not overlap with the manganin resistor 163, and the manganin resistor 163 is located on one side of the closing points of the moving contact 901 and the stationary contact 905.When the circuit breaker is closed, the closing points of the moving contact 901 and the stationary contact 905, as well as the manganese copper resistor 163, will experience a high temperature rise. The arrangement of the manganese copper resistor 163 in the shunt 160 structure, staggering its position from the moving contact 910 and the stationary contact 905, ensures the sampling accuracy of the manganese copper resistor 163 and reduces the temperature rise. Furthermore, the third plate 164 is provided with a precision adjustment notch 168, located near the beginning of the resistor. This notch is situated between the manganese copper resistor 163 and one end of the third plate 164 (specifically, the end of the third plate 164 connected to the fourth plate 170). The precision adjustment notch 168 allows the current to bypass the portion of the manganese copper resistor 163 near its beginning, thereby improving detection accuracy.

[0150] Specifically, the manganese bronze resistor 163 has a parallelogram-shaped plate structure, with its two long sides connected to the second plate 162 and the third plate 164 respectively, and its two short sides located at both ends of the shunt detection section. The shunt detection section is generally rectangular, with the resistor head and tail of the manganese bronze resistor 163 positioned near the apex corners of this rectangular plate structure. The precision adjustment notch 168 is a U-shaped groove, spaced parallel to the resistor head of the manganese bronze resistor 163. The precision adjustment notch 168 is not limited to a U-shaped groove structure; it can be adjusted to other shapes, such as a square groove, as needed. The first plate 161 has a shunt mounting hole 169 in the middle, through which a shunt mounting screw passes to connect to the second housing 200, thus fixing the first plate 161 to the second housing 200. In the shunt detection section, the second plate 162, the manganese bronze resistor 163, and the third plate 164 are coplanar. The precision adjustment notch 168 is a U-shaped notch and is arranged parallel to the manganin resistor 163. The shunt 160 also includes a mounting ear 167, which and the front pin 165 are located on the same end of the second plate 162 in direction d1. The mounting ear 167 is fixedly connected to the second housing 200. Preferably, the mounting ear 167 has a mounting hole, through which a screw passes to connect to the second housing 200, thus fixing the mounting ear 167 to the second housing 200. The shunt detection section and the fourth plate 170 are preferably coplanar.

[0151] like Figure 15 , 16As shown, an innovation of the circuit breaker in this embodiment is that the stationary contact 905, the first plate 161, the second plate 162, the manganese copper resistor 163, the third plate 164, and the fourth plate 170 are all integrated structures. The stationary contact 905 and the shunt 160 are integrated, facilitating integrated manufacturing, resulting in high production efficiency and low production costs. Furthermore, it avoids the use of existing screw connections between the shunt 160 and the stationary contact 905, thereby reducing temperature rise. One end of the first plate 161 in direction d1 is connected to the stationary contact 905, and this end is the first plate connection end. The first plate connection end, the front pin 165, and the rear pin 166 are located on the same end of the shunt 160 in direction d1.

[0152] Specifically, the stationary contact 905 includes a stationary contact bridge 906 and a stationary contact point 907 disposed on the stationary contact bridge 906; the stationary contact bridge 906 is connected to the first plate 161 through an intermediate plate 902. The two ends of the intermediate plate 902 are respectively bent and connected to the first plate connection end and one end of the stationary contact bridge 906, and the stationary contact point 907 is disposed on the other end of the stationary contact bridge 906. The stationary contact 905, intermediate plate 902, and first plate 161 are located on the same side of the shunt detector section in direction d3; the stationary contact bridge 906 is arranged opposite to the plane of the first plate 161 along direction d2; that is, the intermediate plate 902 and the second plate 162 are bent toward the same side of the first plate 161, and the stationary contact bridge 906 and the first plate 161 are bent toward the same side of the intermediate plate 902; the plane of the first plate 161 is perpendicular to direction d2, the plane of the intermediate plate 902 is perpendicular to direction d1, the plane of the shunt detector section is perpendicular to direction d3, and the plane of the stationary contact bridge 906 is perpendicular to direction d2. The intermediate plate 902 is preferably connected to the first plate 161 and the stationary contact bridge 906 by right-angle bends. The first plate 161 and the second plate 162 are preferably connected by right-angle bends.

[0153] Specifically, the magnetic tripping mechanism 720, together with the stationary contact 905 and the shunt 160, forms a modular component through the intermediate plate 902, enabling modular assembly and improving assembly efficiency. In the magnetic yoke 722 of the magnetic tripping mechanism 720, a pair of U-shaped yoke arms are spaced apart relative to each other along direction d3. The armature trigger finger 726 of the armature 723 of the magnetic tripping mechanism 720 extends towards the operating mechanism 800 in direction d2.

[0154] like Figure 2 , 3As shown, an innovation of the circuit breaker in this embodiment is that the circuit breaker further includes a heat insulation sheet 920. The heat insulation sheet 920 is stacked with the shunt detector section along direction d3. The heat insulation sheet 920 is located between the shunt detector section and the side wall of the first housing 100 in direction d3. That is, the shunt detector section is located on one side of the heat insulation sheet 920 in direction d3, and the corresponding side wall of the first housing 100 is located on the other side of the heat insulation sheet 920. The heat insulation sheet 920 reduces the damage to the first housing 100 caused by the heat generated by the shunt 160.

[0155] Specifically, the heat insulation sheet 920 is a mica sheet. The heat insulation sheet 920 is stacked with the shunt detector and the fourth plate 170 along direction d3.

[0156] like Figure 22 , 23 As shown, an innovation of the circuit breaker in this embodiment is that a limiting gap 727 is formed between the stationary contact bridge 906 and the magnetic yoke 722 of the stationary contact 905; one end of the stationary contact arc-starting plate 912 is inserted into the limiting gap 727 and the end of the stationary contact arc-starting plate 912 is in contact with the stationary contact 906; the other end extends to one side of the arc-extinguishing chamber 911; the stationary contact bridge 906, the magnetic yoke 722, and the second housing 200 are all in limiting cooperation with the stationary contact arc-starting plate 912, limiting the stationary contact arc-starting plate 912 to its working position and preventing the stationary contact 912 from moving along directions d1, d2, and d3. Furthermore, the second housing 200 includes an arc-starting plate limiting structure 227 disposed on its inner sidewall; the stationary contact arc-starting plate 912 includes an arc-starting plate mating structure 915 disposed in its middle, the arc-starting plate mating structure 915 including a first mating plate 916; in the direction d1, the first mating plate 916 is engaged between the stationary contact bridge 906 and the arc-starting plate limiting structure 227, preventing the stationary contact arc-starting plate 912 from moving along the direction d1; in the direction d2, one side of the stationary contact arc-starting plate 912 is limited and mated with the magnetic yoke 722 and the second housing 200, and the other side of the stationary contact arc-starting plate 912 is limited and mated with the stationary contact bridge 906, preventing the stationary contact arc-starting plate 912 from moving along the direction d2; in the direction d3, a pair of side edges of the stationary contact arc-starting plate 912 are respectively limited and mated with the arc-starting plate limiting structure 227, preventing the stationary contact arc-starting plate 912 from moving along the direction d3. The limiting method of the stationary contact arc-starting plate 912 is simpler and faster to install compared with the existing technology of riveting or welding the stationary contact arc-starting plate 912 to the stationary contact.

[0157] Specifically, the arc-starting plate limiting structure 227 includes a limiting platform 215 and an arc-starting plate stop 226. Two sets of arc-starting plate stop 226 are located on either side of the limiting platform 215 in direction d3. The first mating plate 916 is engaged between the stationary contact bridge 906 and the limiting platform 215, preventing the stationary contact arc-starting plate 912 from moving along direction d1. In direction d3, a pair of side edges of the stationary contact arc-starting plate 912 are respectively limited and engaged with the two sets of arc-starting plate stop 226, preventing the stationary contact arc-starting plate 912 from moving along direction d3. Further, the stationary contact arc-starting plate 912 includes an arc-starting plate head plate 914, an arc-starting plate mating structure 915, and an arc-starting plate tail plate 919 connected sequentially along direction d1. One end of the arc-starting plate 914 is inserted into the limiting gap 727, and the other end is connected to the arc-starting plate mating structure; one end of the arc-starting plate 919 is connected to the arc-starting plate mating structure 915, and the other end extends to one side of the arc-extinguishing chamber 911; the arc-starting plate mating structure 915 includes a first mating plate 916, a second mating plate 917, and a third mating plate 918 connected in sequence. The two ends of the first mating plate 916 are perpendicularly connected to the arc-starting plate 914 and the second mating plate 917, respectively. The planes containing the arc-starting plate 914, the first mating plate 916, and the arc-starting plate 919 are all perpendicular to direction d1, the plane containing the second mating plate 917 is perpendicular to direction d2, and the third mating plate 918 is inclined; the limiting platform 215 includes a first limiting surface 223, a second limiting surface 224, and a third limiting surface 225 arranged in sequence. The first limiting surface 223 is perpendicular to direction d1. The first mating plate 916 is positioned between the stationary contact bridge 906 and the first limiting surface 223 along direction d1, preventing the stationary contact arc-initiating plate 912 from moving along direction d1 and disengaging from the limiting gap 727. The second limiting surface 224 abuts against the second mating plate 917 along direction d2, and the third limiting surface 225 abuts against the third plate 918. The moving contact 901, stationary contact 905, and arc-extinguishing chamber 911 are all located on the same side of the stationary contact arc-initiating plate 912 in direction d2. The first mating plate 916 is bent relative to the first arc-initiating plate 914 towards the side where the moving contact 901 is located. The second mating plate 917 is offset relative to the first arc-initiating plate 914 towards the side where the moving contact 901 is located. The third mating plate 918 is bent relative to the second mating plate 917 towards the side where the first mating plate 916 is located. The first arc-initiating plate 914, the tail arc-initiating plate 919, and the second mating plate 917 are arranged sequentially in direction d2.

[0158] Specifically, the second housing 200 contains an independent arc-extinguishing cavity 205 for accommodating the arc-extinguishing chamber 911. The arc-extinguishing cavity 205 is formed by assembling half-cavities respectively disposed on the upper housing 201 and the lower housing 202. In direction d1, one end of the arc-extinguishing cavity 205 engages with the contact mechanism 900 and is opposite to the arc inlet end of the arc-extinguishing chamber 911, while the other end has an exhaust port that engages with the exhaust end of the arc-extinguishing chamber 911. The arc inlet end of the arc-extinguishing chamber 911 refers to the end of the arc-extinguishing chamber 911 that engages with the contact mechanism 900. The exhaust end of the arc-extinguishing chamber 911 is opposite to the arc inlet end and is disposed at both ends of the arc-extinguishing chamber 911. Multiple material-reducing grooves 229 are provided on the outer surface of the sidewall of the arc-extinguishing cavity 205 opposite to the exhaust end of the arc-extinguishing chamber 911, which ensures the structural strength of the sidewall while reducing raw materials and saving costs. Each of the material reduction grooves 229 preferably extends along direction d3, and the material reduction grooves 229 are preferably arranged side by side at intervals along direction d2.

[0159] like Figure 2 , 3 As shown in Figure 5, an innovation of the circuit breaker in this embodiment is that the circuit breaker further includes a busbar clamp support structure. The busbar clamp support structure is arranged in the direction d3 between the first busbar clamp 451 and the second busbar clamp 452, so that the first busbar clamp 451 and the second busbar clamp 452 are aligned with the first socket 111 and the second socket 113 respectively. That is, the gap of the first busbar clamp 451 is aligned with the first socket 111 and the gap of the second busbar clamp 452 is aligned with the second socket 113, thereby ensuring that the corresponding busbars (e.g., the negative busbar and the positive busbar) can be plugged into the first busbar clamp 451 and the second busbar clamp 452 respectively through the first socket 111 and the second socket 113.

[0160] Specifically, the busbar clamp support structure includes a busbar clamp bracket 500, an upper shell support portion 220 disposed at one end of the upper shell 201, and a lower shell support portion 221 disposed at one end of the lower shell 202. The upper shell support portion 220, the busbar clamp bracket 500, and the lower shell support portion 221 are arranged sequentially along direction d3. The first busbar clamp 451 and the second busbar clamp 452 are respectively disposed on both sides of the lower shell support portion 221 and the upper shell support portion 220 along direction d3. Furthermore, both the first busbar clamp 451 and the second busbar clamp 452 include two clamping plates arranged opposite each other along direction d3, each clamping plate having an arched structure, and the arched structures of the two clamping plates protruding towards each other; the lower shell support portion 221 is provided with a support protrusion band extending along direction d3, which is adapted to the clamping plate of the corresponding first busbar clamp 451; the upper shell support portion 220 is provided with a support protrusion band extending along direction d3, which is adapted to the clamping plate of the corresponding second busbar clamp 452. The lower shell support portion 221 and the lower shell support portion 220 are preferably fixedly connected to the busbar clamp bracket 500 respectively. The cross-section of the support protrusion band perpendicular to direction d2 is an arched structure, and the arched structure protrudes towards the clamping plate of the corresponding busbar clamp.

[0161] In other embodiments, the upper shell 201 does not have an upper shell support 220, the lower shell 202 does not have a lower shell support 221, and the busbar clamp support structure only has a busbar clamp bracket 500. The first busbar clamp 451 and the second busbar clamp 452 are respectively arranged on both sides of the busbar clamp bracket 500 in the direction d3.

[0162] Specifically, the connector 148 of the second circuit board 145 is disposed between the upper shell support portion 220 and the lower shell support portion 221. Further, the connector 148 is disposed on one side of the busbar clamp bracket 500 in direction d2. As another embodiment, the connector 148 may also be disposed within the busbar clamp bracket 500, located within one end of the busbar clamp bracket 500 in direction d2.

[0163] like Figure 1-6As shown in Figures 18-21 and 26, the circuit breaker in this embodiment further includes a protection structure 120. The protection structure 120 is used to prevent the circuit breaker from being pulled out of its mounting position when closed, to prevent the circuit breaker from being installed in its mounting position when closed, and to prevent the circuit breaker from closing between being installed in its mounting position and being in the correct position. The circuit breaker mounting position refers to the location for installing the circuit breaker and the structure that cooperates with the circuit breaker at that location, such as a mounting position provided by a cabinet or distribution box. The protection structure 120 is located on the side of the operating member 300 in direction d3. The protective structure 120 includes a protective element 121, which includes a protective boss 1211. The protective boss 1211 is configured to protrude at one end outside the first housing 100, and is used to engage with the structure of the circuit breaker mounting position after the circuit breaker is installed in place. When the circuit breaker is in the closed state, the operating element 300 limits the protective element 1211, preventing it from moving into the first housing 100. When the protective boss 1211 is retracted into the first housing 100, the protective element 121 limits the operating element 300, preventing it from moving to the closed position. The protective element 121 and the operating element 300 are in a transmission engagement. When the circuit breaker is in the open state, pulling the operating element 300 can drive the protective element 121 to move the protective boss 1211 into the first housing 100, thereby releasing the structural engagement between the protective boss 1211 and the circuit breaker mounting position, and allowing the circuit breaker to be pulled out of the mounting position.

[0164] like Figure 2-6 As shown in Figures 18 and 26, the protective member 121 is located on one side of the operating member 300 in direction d3. A portion of the operating member 121 is located between the operating member 300 and the side wall of the first housing 100. The protective member 121 is linearly movable. Preferably, the protective member 121 is linearly movable along direction d3, perpendicular to the moving direction of the operating member 300.

[0165] In another embodiment, the protective element 121 can also be rotatably configured.

[0166] like Figure 4 , 18 As shown in Figures 19 and 26, the protective component 121 further includes a protective component limiting foot 1212; the operating component 300 further includes a stop 308; when the protective boss 1211 is squeezed by external force and retracts into the first housing 100, the protective component limiting foot 1212 moves into the moving path of the stop 308 and engages with the stop 308 to limit and prevent the operating component 300 from moving to the closing position.

[0167] Specifically, the stop 308 is implemented by the end face of one end of the operating member 300, which is the end face of the button body 301 near the operating mechanism 800.

[0168] like Figure 2-6 As shown in Figures 18 and 26, the protective structure 120 further includes a first elastic element, which acts on the protective member 121, causing the protective boss 1211 to tend to move outward from the first housing 100. The first elastic element is preferably a first spring 123.

[0169] like Figure 2-6 As shown in Figures 18 and 26, the protection structure 120 further includes a linkage 122, which is in transmission cooperation with the operating member 300 and the protection member 121 respectively. When the circuit breaker is in the open state, the operating member 300 is pulled, and the pulling member 300 drives the protection member 121 to move through the linkage 122, causing the protection boss 1211 to move into the first housing 100. The protection structure 120 also includes a second elastic member, which acts on the linkage 122 to reset it. The second elastic member is preferably a second spring 124. The linkage 122, the first housing 100, and the protection member 121 are in a limiting cooperation, so that the protection member 121 can only move along the direction d3.

[0170] It should be noted that the protective structure 120 may also omit the linkage 122, allowing the protective member 121 to move directly driven by the operating member 300. For example, the operating member 300 may have two drive walls spaced apart side-by-side along direction d2, each drive wall having an inclined side surface; the protective member 121 may have two driven columns, each driven column slidingly engaging with one of the two drive walls, each driven column located on the corresponding inclined side surface in direction d3; when the operating member 300 is pulled, the sliding engagement between the inclined side surface and the driven column drives the protective member 121 to move, thereby causing the protective boss 1211 to retract into the first housing 100. Various modifications can be made by those skilled in the art using conventional techniques, which will not be listed here.

[0171] Specifically, the linkage 122 includes a linkage body 1220, a linkage driven part 1222, and a linkage driving arm 1226. The linkage driven part 1222 is disposed on one end of the linkage body 1220 facing the operating member 300. Two linkage driving arms 1226 are connected to the other end of the linkage body 1220. The two linkage driving arms 1226 are arranged side by side and spaced apart along direction d2, forming a linkage clearance notch 1225 between them. The protective member 121 includes a protective member body 1210, a protective member driven arm 1213, a protective boss 1211, and a protective member limiting foot 1212. The protective boss 1211 and the protective member limiting foot 1212 are respectively disposed at both ends of the protective member body 1210 (i.e., both ends of the protective member body 1210 in direction d3). The two protective member driven arms 1213 are respectively connected to both sides of the protective member body 1210 in direction d2. The protective component body 1210 is inserted into the linkage clearance notch 1225 between the two linkage drive arms 1226. The two linkage drive arms 1226 are respectively mounted on the two protective component driven arms 1213. The protective component driven arms 1213 are located between the linkage drive arms 1226 and the operating member 300 in the direction d3. When the circuit breaker is in the open state, pulling the operating member 300 moves it outward from the first housing 100. The operating member 300 presses against the linkage driven part 1222, driving the linkage 122 to move. The linkage 122, through the linkage drive arm 1226, presses against the protective component driven arm 1213, causing the protective component 121 to move, thereby driving the protective boss 1211 to retract into the first housing 100. The operating member 300 has an unlocking boss 307 on the side facing the linkage member 120. When the circuit breaker is in the open state, the operating member 300 is pulled and presses against the free end of the driven part 1222 of the linkage member through the unlocking boss 307, thereby driving the linkage member 122 to move.

[0172] Specifically, the second spring 124 is a compression spring. The linkage 122 also includes a second spring post 1224, which extends along direction d1. The second spring post 1224, the linkage body 1220, and the linkage drive arm 1226 are sequentially connected along direction d1, that is, the second spring post 1224 and the linkage drive arm 1226 are respectively connected to both ends of the linkage body 1220. The first housing 100 also includes an end limiting rib 115. One end of the second spring 124 cooperates with the second housing 100, and the other end is sleeved on the second spring post 1224; the second spring 124 acts on the linkage body 1220 to press against the protective body 1210, and the protective body 1210 abuts against the end limiting rib 115 along direction d1 and slides with it. The first housing 100 also includes a spring seat 116, which is disposed opposite to the linkage 122 along direction d1, and the end of the second spring 124 that cooperates with the first housing 100 is limited on the spring seat 116.

[0173] It should be noted that the linkage 122 and the second elastic element are not limited to the above-described implementation. For example, the linkage 122 can be rotatably mounted on the first housing 100 by two first spring posts 1223, without the need for a second elastic element, and the first springs 123 can reset the linkage 122 through the protective element 121.

[0174] Specifically, the linkage 122 further includes a first spring post 1223. The two first spring posts 1223 are respectively connected to both sides of the linkage body 1220 in the direction d2, and the first spring posts 1223 extend along the direction d2. The first spring 123 is a double torsion spring, which includes two single torsion springs 1230 and a spring connecting rod 1231. Each single torsion spring 1230 includes a helix 1232 and a first spring arm 1233 and a second spring arm 1234 respectively connected to the helix 1232. The second spring arms 1234 of the two single torsion springs 1230 are connected by the spring connecting rod 1231. The protective component 121 also includes a protective component mating shoulder 1216. Each protective component's driven arm 1213 has its two ends connected to the protective component body 1210 and a protective component mating shoulder 1216, respectively. The two protective component mating shoulders 1216 are located on either side of the two linkage drive arms 1226 in direction d2. A protective component spring groove 1215 is provided on one side of the surface-shaped operating component 300 of the protective component mating shoulder 1216. The spring connecting rod 1231 mates with the first housing 100. The helical bodies 1232 of the two single torsion springs 1230 are respectively sleeved on the two first spring pillars 1223. The first spring arm 1233 of each single torsion spring 1230 is located within the protective component spring groove 1215 of the corresponding protective component mating shoulder 1216.

[0175] In other embodiments, the first elastic element may also be a compression spring, a tension spring, or a single torsion spring, and the way the first elastic element and the protective element 121 are matched may be adjusted according to the specific type of the first elastic element.

[0176] Specifically, each of the protective components has a protective component moving groove 1214 formed between the mating shoulder 1216 and the protective component body 1210, and each linkage drive arm 1226 is located within the corresponding protective component moving groove 1214. A linkage drive groove 1221 is provided at the connection between the linkage drive arm 1226 and the linkage body 1220, and each protective component moving arm 1213 is located within the corresponding linkage drive groove 1221.

[0177] Specifically, the first housing 100 further includes two side limiting ribs 114, which are located on both sides of the protective body 1210 in the direction d2 and are slidably engaged with it. The side limiting ribs 114 and the end limiting ribs 115 are both provided on the inner side of the first housing 100 opposite to the operating member 300 in the direction d3.

[0178] like Figure 2 , 3 Figures 5 and 6 show one layout of the circuit breaker in this embodiment:

[0179] The second housing 200 and the second connecting plate 150 are arranged side by side along direction d3, with the second connecting plate 150 located between the side walls of the second housing 200 and the first housing 100 in direction d3. The second connecting plate 150 is located between the upper shell 201 of the second housing 200 and the side wall of the first housing 100. The terminal block assembly 400 and the second housing 200 are arranged sequentially along direction d1. The terminal block assembly 400 and the protective structure 120 are located on opposite sides of the operating member 300 in direction d3. The first main board 131 and the second connecting plate 150 of the first connecting plate 130 are located on opposite sides of the second housing 200 in direction d3, with the first main board 131 located between the side walls of the second housing 200 and the first housing 100 in direction d3. The first support plate 133 and the second circuit board 145 of the second connecting plate 130 are located on opposite sides of the second housing 200 in direction d2. The operating element 300, electric reclosing mechanism 600, operating mechanism 800, contact mechanism 900, and arc extinguishing mechanism 910 are arranged sequentially along direction d1. Along direction d1, the terminal block assembly 400 and operating element 300 are located at one end of the circuit breaker, and the first busbar clamp 451 and second busbar clamp 452 are located at the other end. The overload protection mechanism 710 and magnetic tripping mechanism 720 are arranged sequentially along direction d1. Along direction d2, the overload protection mechanism 710, magnetic tripping mechanism 720, first support plate 133, and the first plate 161 of the shunt 160 are located on one side of the circuit breaker, and the second circuit board 145 is located on the other side. Along direction d3, the second connecting plate 150 is located on one side of the second housing 200, and the shunt detection section and fourth plate 170 of the shunt 160 are located on the other side of the second housing 200. This circuit breaker layout enables the circuit breaker to carry a current of 250A.

[0180] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0181] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker, wherein its length direction, width direction, and height direction are respectively direction d1, direction d2, and direction d3; characterized in that: The circuit breaker includes a first housing (100), a second housing (200) disposed inside the first housing (100), and an electric reclosing mechanism (600), a thermomagnetic system (700), an operating mechanism (800), a contact mechanism (900), and an arc extinguishing mechanism (910) all disposed in the second housing (200); the second housing (200) includes an upper housing (201) and a lower housing (202) configured to be assembled opposite to each other along direction d3; the lower housing (202) includes m sub-housings configured to be assembled opposite to the upper housing (201) along direction d3, where m≥2.

2. The circuit breaker according to claim 1, characterized in that: The lower shell (202) includes two sub-shells arranged sequentially along direction d1, namely the front sub-shell (203) and the rear sub-shell (204).

3. The circuit breaker according to claim 2, characterized in that: The operating mechanism (800) includes a first rotating shaft structure (810), a transmission link (820), and a second rotating shaft structure (830) that are in transmission cooperation with the electric reclosing mechanism (600). The first rotating shaft structure (810) is connected to the second rotating shaft structure (830) through the transmission link (820). The contact mechanism (900) includes a moving contact (901) and a stationary contact (905) that are used in cooperation. The moving contact (901) is connected to the second rotating shaft structure (830). The electric reclosing mechanism (600) and the first rotating shaft structure (810) are both arranged in the space between the front sub-shell (203) and the upper shell (201); the second rotating shaft structure (830), the contact mechanism (900) and the arc extinguishing mechanism (910) are all arranged in the space between the rear sub-shell (204) and the upper shell (201); the transmission link (820) is configured to extend from the space between the front sub-shell (203) and the upper shell (201) to the space between the rear sub-shell (204) and the upper shell (201).

4. The circuit breaker according to claim 2 or 3, characterized in that: The thermomagnetic system (700) includes a thermal tripping mechanism (710) and a magnetic tripping mechanism (720). The thermal tripping mechanism (710) includes a bimetallic strip (711) which extends from the space between the front sub-shell (203) and the upper shell (201) to the space between the rear sub-shell (204) and the upper shell (201). The magnetic tripping mechanism (720) is located in the space between the rear sub-shell (204) and the upper shell (201).

5. The circuit breaker according to claim 3, characterized in that: The electric reclosing mechanism (600) includes a motor (601) and a gear set (602). The motor (601) is driven by the operating mechanism (800) through the gear set (602). The output shaft axis of the motor (601) and the rotation shaft axis of each gear in the gear set are both parallel to the direction d3. The rotation shaft axes of the first rotating shaft structure (810) and the second rotating shaft structure (830) are both parallel to the direction d3.

6. The circuit breaker according to claim 1, characterized in that: Both the upper shell (201) and the lower shell (202) are provided with multiple material reduction openings.

7. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes at least one set of bus clamps, which are respectively disposed at one end of the circuit breaker in the direction d1; the operating mechanism (800), contact mechanism (900), arc extinguishing mechanism (910) and bus clamps are arranged sequentially along the direction d1; each set of bus clamps is disposed between the side wall of the first housing (100) and the second housing (200), and the side wall of the first housing (100) is provided with louver structures that correspond to and cooperate with each set of bus clamps.

8. The circuit breaker according to claim 7, characterized in that: The circuit breaker includes two sets of busbar clamps arranged side by side at intervals along direction d3; the first housing 100 has louver structures on the side walls opposite to each set of busbar clamps along direction d3; the size of the first housing (100) along direction d2 is greater than the size along direction d3.

9. The circuit breaker according to claim 1, characterized in that: The circuit breaker further includes an operating element (300) and a terminal block assembly (400) both disposed at one end of the circuit breaker in the direction d1; the operating element (300) and the terminal block assembly (400) are arranged side by side in the direction d3; the operating element (300) is a button that is slidably disposed in the first housing (100) in the direction d1 and located between the side wall of the first housing (100) and the terminal block assembly (400); at least a portion of the terminal block assembly (400) is located in the first housing (100) and is arranged sequentially with the second housing (200) in the direction d1, and the terminal block assembly (400) includes a terminal block (401) and a terminal block (422) disposed in the terminal block (401).

10. The circuit breaker according to claim 9, characterized in that: The terminal block (401) includes a terminal block body (402) and a support frame (410); the terminal blocks (422) are disposed within the terminal block body (402); the terminal block body (402) includes a wiring interface (405) and wiring holes disposed on the wiring interface (405) and corresponding to each of the terminal blocks (422); in the direction d3, the wiring interface (405) is located on one side of the support frame (410), and the operating member (300) is located on the other side of the support frame (410); the support frame (410) and the second housing (200) are respectively located on both sides of the terminal block body (402) in the direction d1; the support frame (410) is provided with a sliding hole (413), and the sliding hole (413) is provided with at least one cable extending along the direction d1 and split at both ends. The supporting rib (412) is not connected to the support frame (410) and the terminal block body (402); the operating element (300) includes a button body (301) and a guide side edge (302) provided at one end of the button body (301); at least a portion of the button body (301) is always located between the terminal block body (402) and the side wall of the first housing (100); a sliding shoulder (303) is provided on each of the outer sides of the two ends of the guide side edge (302), and at least one side edge groove (304) is provided in the middle of the guide side edge (302); the guide side edge (302) is inserted into the sliding hole (413), the two sliding shoulders (303) are respectively slidably engaged with a pair of sides of the support frame (410), and the side edge groove (304) is slidably engaged with the supporting rib (412) one-to-one.

11. The circuit breaker according to claim 9 or 10, characterized in that: The terminal block (401) includes a terminal block groove (411) disposed on the side of it facing the operating member (300), and the operating member (300) is slidably disposed in the terminal block groove (411) along direction d1.

12. The circuit breaker according to claim 11, characterized in that: The terminal block groove (411) is configured to extend along direction d1 from one side of the support frame (410) to one side of the terminal block body (402).

13. The circuit breaker according to claim 9, characterized in that: The terminal block (401) has a temperature measuring groove (419) at one end facing the second housing (200); the circuit breaker also includes a first circuit board (140) disposed in the second housing (200), the first circuit board (140) includes a temperature measuring finger (141) and a temperature measuring element (142) disposed on the temperature measuring finger (141), and the free end of the temperature measuring finger (141) is inserted into the temperature measuring groove (419).

14. The circuit breaker according to claim 9, characterized in that: The circuit breaker also includes a first connecting plate (130), which is used to cooperate with the corresponding terminal (422) and to be electrically connected to the contact mechanism (900); the thermal tripping mechanism (710) of the thermomagnetic system (700) includes a bimetallic strip (711), an adjusting screw (712) and a limiting member (713). One end of the bimetallic strip (711) is directly fixed to the first connecting plate (130), and the other end is provided with a double metal hole and inserted into the limiting member (713). The bimetallic strip (711) and the limiting member (713) remain relatively stationary. The limiting member (713) is provided with a limiting member hole opposite to the double metal hole. The diameter of the double metal hole is larger than that of the limiting member hole. The adjusting screw (712) passes through the limiting member hole and the double metal hole and is threadedly engaged with the limiting member hole.

15. The circuit breaker according to claim 14, characterized in that: The first connecting plate (130) includes a first main board (131), a first terminal block (132), and a first support plate (133); one end of the first terminal block (132) is connected to the first main board (131), and the other end is inserted into the terminal block (401) to cooperate with the corresponding terminal block (422); the first support plate (133) is bent and connected to the first main board (131); one end of the bimetallic strip (711) is fixedly connected to the first support plate (133); the first main board (131) is located between the side wall of the first housing (100) and the second housing (200) in the direction d3; and the plane where the first support plate (133) is located is perpendicular to the direction d2.

16. The circuit breaker according to claim 15, characterized in that: The first terminal block (132) has an L-shaped structure, including a terminal block mating part and a terminal block connecting part. The two ends of the terminal block connecting part are bent and connected to the first main board (131) and the terminal block mating part, respectively. The plane of the terminal block mating part is parallel to the plane of the first main board (131) and is used to be inserted into the terminal block (401) to mate with the corresponding terminal block (422). The first connecting plate (130) also includes a first connecting finger (135) connected to the first main board (131). The circuit breaker also includes a second circuit board (145), which is disposed in the direction d2 between the side wall of the first housing (100) and the second housing (200). The second circuit board (145) includes a first power-taking terminal (146), which is plugged into and electrically connected to the first connecting finger (135).

17. The circuit breaker according to claim 1, characterized in that: The arc-extinguishing mechanism (910) includes a moving contact arc-starting plate (913), an arc-extinguishing chamber (911), and a stationary contact arc-starting plate (912); in the direction d2, the moving contact arc-starting plate (913) and the stationary contact arc-starting plate (912) are respectively located on both sides of the arc-extinguishing chamber (911); the contact mechanism (900) includes a moving contact (901) and a stationary contact (905) used in conjunction; the stationary contact arc-starting plate (912) is used to interact with the stationary contact (905). The moving contact arc-inducing plate (913) is used to cooperate with the moving contact (901); the moving contact (901) includes a moving contact bridge (903) and a moving contact. One end of the moving contact bridge (903) is connected to the operating mechanism (800), and the moving contact is set on the other end of the moving contact bridge (903). The moving contact bridge (903) is provided with a moving contact hook at this end. The moving contact hook is used to cooperate with the moving contact arc-inducing plate (913) when the moving contact (901) is in the open position.

18. The circuit breaker according to claim 3, characterized in that: The second rotating shaft structure (830) includes a second rotating shaft (831) rotatably mounted on the second housing (200) and a snap fastener (832) and a locking fastener (833) rotatably mounted on the second rotating shaft (831) and engaged with it; the transmission link (820) is rotatably connected to the snap fastener (832) through the connecting shaft (821); the moving contact (901) includes a moving contact bridge (903) and a moving contact, the middle part of the moving contact bridge (903) is rotatably mounted on the second rotating shaft (831), one end is provided with a moving contact and the other end is provided with a limiting hook (904); the circuit breaker also includes a contact torsion spring (835), the contact torsion spring (835) is sleeved on the rotating shaft of the moving contact bridge (903), one spring arm is engaged with the second rotating shaft (831) and the other spring arm is engaged with the limiting hook (904).

19. The circuit breaker according to claim 3, characterized in that: The second rotating shaft structure (830) includes a second rotating shaft (831) rotatably mounted on the second housing (200) and a snap fastener (832) and a locking fastener (833) rotatably mounted on the second rotating shaft (831) and engaged with it; the transmission link (820) is rotatably connected to the snap fastener (832) via the connecting shaft (821); the second rotating shaft (831) is provided with a rotating shaft clearance groove (834) for avoiding the connecting shaft (821) at one end facing the second rotating shaft (831).

20. The circuit breaker according to claim 1, characterized in that: The second housing (200) further includes a second housing clearance groove (228) disposed on its outer side wall; the circuit breaker further includes a second circuit board (145) disposed side by side with the second housing (200) along direction d2, the second circuit board (145) being located between the side walls of the second housing (200) and the first housing (100) in direction d2; the second housing clearance groove (228) is opposite to the second circuit board (145) along direction d2, and is used to avoid some components of the second circuit board (145).

21. The circuit breaker according to claim 1, characterized in that: The arc extinguishing mechanism (910) includes an arc extinguishing chamber (911); the second housing (200) has an independent arc extinguishing cavity (205) for accommodating the arc extinguishing chamber (911); in the direction d1, one end of the arc extinguishing cavity (205) is engaged with the contact mechanism (900) and is opposite to the arc inlet end of the arc extinguishing chamber (911), and the other end of the arc extinguishing cavity (205) is provided with an exhaust port that is engaged with the exhaust end of the arc extinguishing chamber (11), and a plurality of weight reduction grooves (229) are provided on the outer side surface of the side wall of the arc extinguishing cavity (205) opposite to the exhaust end of the arc extinguishing chamber (911).

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