Circuit breaker

Abstract

The invention relates to the field of low-voltage electric appliances, in particular to a circuit breaker, an upper area and a lower area are arranged side by side in the height direction of the circuit breaker on a projection perpendicular to the width direction of the circuit breaker, and a contact area and an arc extinction area of the lower area are arranged side by side in the length direction of the circuit breaker; in the operating device, the electromagnetic system is arranged in the upper area, and the transmission frame extends to the lower area from the upper area. In each group of switching devices, a contact unit is arranged in a contact area and comprises a contact mechanism and an arc extinguishing chamber, the contact mechanism comprises a moving contact assembly and a static contact group, and a zero flashover mechanism is arranged in an arc extinguishing area and is communicated with an exhaust port of the arc extinguishing chamber and the outside; the electromagnetic system is in transmission connection with the moving contact assembly through the transmission frame to drive the moving contact assembly to move. The circuit breaker is long in service life, reasonable in internal layout, convenient to assemble and good in arc extinguishing effect.

Description

Technical Field

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

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time.

[0003] The present invention refers to the structure and principle of the existing contactor and designs a new contactor type circuit breaker, which includes a shell and an electromagnetic system, a transmission frame, and a switch device arranged in the shell. The switch device includes a contact mechanism and an arc extinguishing chamber. The electromagnetic system drives the contact mechanism to close and open through the transmission frame, and the arc extinguishing chamber is used to extinguish the arc generated by the contact mechanism.

[0004] However, the existing contactors have the following problems:

[0005] 1. The arc extinguishing effect is not good, and arc escape is likely to occur.

[0006] 2. The overall structural layout is unreasonable, it occupies a large space, and the assembly operation is complicated.

[0007] 3. It does not have short circuit protection function. Summary of the invention

[0008] The purpose of the present invention is to overcome at least one defect of the prior art and provide a circuit breaker which adopts an operating device and a contact mechanism similar to a contactor, thereby greatly improving the service life; and the internal layout of the circuit breaker is reasonable, easy to assemble, and has a good arc extinguishing effect.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A circuit breaker, comprising a housing, an operating device and at least one set of switch devices; in a projection perpendicular to the width direction of the circuit breaker, the housing comprises an upper region and a lower region arranged side by side along the height direction of the circuit breaker, and the lower region comprises a contact region and an arc extinguishing region arranged side by side along the length direction of the circuit breaker;

[0011] The operating device includes an electromagnetic system arranged in the upper area and a transmission frame extending from the upper area to the lower area; each group of the switch devices includes a contact unit and a zero arcing mechanism respectively arranged in the contact area and the arc extinguishing area; the contact unit includes a contact mechanism and an arc extinguishing chamber used in conjunction with each other, and the contact mechanism includes a moving contact assembly and a static contact group used in conjunction with each other; the electromagnetic system is connected to the moving contact assembly through the transmission frame to drive the moving contact assembly to move; the exhaust port of the arc extinguishing chamber is connected to the outside through the zero arcing mechanism.

[0012] Further, the circuit breaker includes two or more sets of switching devices, and the switching devices are arranged side by side in the width direction of the circuit breaker.

[0013] Further, in the housing, the two arc extinguishing regions are respectively located on both sides of the contact region in the length direction of the circuit breaker; in the switching device, each static contact group includes two sets of static contacts arranged side by side in the length direction of the circuit breaker, and both ends of the moving contact of the moving contact assembly are synchronously closed and disconnected from the two sets of static contacts. The two arc extinguishing chambers are respectively located on both sides of the contact mechanism in the length direction of the circuit breaker, and the two zero-fly arc mechanisms are respectively matched with the two arc extinguishing chambers, and are respectively located on both sides of the contact unit and arranged in the two arc extinguishing regions in the length direction of the circuit breaker.

[0014] Further, the static contact group and the moving contact assembly of the electromagnetic system are arranged side by side in sequence in the height direction of the circuit breaker.

[0015] Further, the electromagnetic system includes an electromagnetic coil, a main magnetic yoke and a main armature. The electromagnetic coil is sleeved on the main magnetic yoke to form a coil assembly fixedly arranged in the upper region. The main armature is fixedly connected to the transmission frame and moves synchronously. The main armature cooperates with the main magnetic yoke, and the coil assembly, the main armature and the transmission frame are arranged in sequence in the height direction of the circuit breaker.

[0016] Further, the transmission frame includes a transmission frame linkage part that is in transmission connection with the moving contact assembly, and the transmission frame linkage part is arranged side by side with the switching device in the width direction of the circuit breaker.

[0017] Further, the circuit breaker includes two or more sets of switching devices arranged side by side in the width direction of the circuit breaker. The transmission frame includes at least one transmission frame linkage part, and one transmission frame linkage part is provided between every two adjacent sets of switching devices.

[0018] Further, the circuit breaker further includes at least one set of quick-acting mechanism. The quick-acting mechanism is arranged side by side with the main armature in the length direction of the circuit breaker. Each set of switching devices is used in cooperation with at least one set of quick-acting mechanism; the quick-acting mechanism is used to cut off the power supply of the electromagnetic coil of the electromagnetic system when a short-circuit fault occurs in the circuit where the corresponding switching device is located.

[0019] Further, the electromagnetic system, the static contact group and the moving contact assembly are arranged side by side in sequence in the height direction of the circuit breaker;

[0020] The quick-acting mechanism includes an auxiliary switch, an auxiliary yoke, an auxiliary armature, and an auxiliary reset member. The auxiliary yoke is disposed on the static contact set of the corresponding switching device. The auxiliary switch, the auxiliary armature, and the auxiliary reset member are all disposed on the drive rack. The auxiliary reset member acts on the auxiliary armature to give it a tendency to move away from the auxiliary yoke. The auxiliary armature and the auxiliary yoke are arranged side by side along the height direction of the circuit breaker. When a short-circuit fault occurs in the circuit where the switching device is located, the auxiliary yoke of the corresponding quick-acting mechanism attracts the auxiliary armature to move, and the auxiliary armature triggers the auxiliary switch to change its state, thereby cutting off the power supply to the electromagnetic coil.

[0021] Further, the drive rack further includes a drive-rack bearing portion located between the coil assembly and the switching device in the height direction of the circuit breaker. The main armature is disposed on the drive-rack bearing portion and fixedly connected thereto. The auxiliary armature, the auxiliary reset member, and the auxiliary switch of the quick-acting mechanism are all disposed on the drive-rack bearing portion.

[0022] Further, the drive-rack bearing portion is provided with a bearing-portion installation bin that is arranged in one-to-one correspondence and cooperation with the quick-acting mechanism. The auxiliary armature and the auxiliary reset member are both disposed in the bearing-portion installation bin, and the auxiliary switch is disposed outside the bearing-portion installation bin.

[0023] Further, the circuit breaker includes two or more groups of switching devices. The switching devices are arranged in one-to-one correspondence and cooperation with the quick-acting mechanisms. Each quick-acting mechanism is arranged side by side along the width direction of the circuit breaker. Adjacent two groups of quick-acting mechanisms share an auxiliary switch, and this auxiliary switch is located between two bearing-portion installation bins that respectively cooperate with the adjacent two quick-acting mechanisms.

[0024] Further, in the switching device, the static contact set includes two groups of static contacts arranged side by side along the length direction of the circuit breaker. The static contacts are arranged in one-to-one correspondence and cooperation with the quick-acting mechanisms. The two groups of quick-acting mechanisms that cooperate with the same static contact set are respectively arranged on both sides of the main armature.

[0025] Further, in the length direction of the circuit breaker, among multiple quick-acting mechanisms located on the same side of the main armature, adjacent two groups of quick-acting mechanisms share an auxiliary switch, and this auxiliary switch is located between two bearing-portion installation bins that respectively cooperate with the adjacent two groups of quick-acting mechanisms.

[0026] Further, the electromagnetic system further includes a main reset member. The main reset member is a main reset spring. Four main reset springs are distributed at the four vertices of a rectangle and are arranged around the coil assembly of the electromagnetic system. Both ends of each main reset spring are respectively in cooperation with the housing and the drive rack.

[0027] Further, each group of the contact units each includes a unit housing, and a contact mechanism and an arc extinguishing chamber disposed in the unit housing. In each group of switching devices, the zero-flyover mechanism is disposed outside the contact unit, and the zero-flyover mechanism and the contact unit are arranged side by side along the length direction of the circuit breaker.

[0028] Furthermore, the housing includes an upper housing, a middle housing, and a lower housing that are sequentially joined together along the height direction of the circuit breaker. An upper region is formed between the upper housing and the middle housing, and a lower region is formed between the middle housing and the lower housing. When the circuit breaker includes at least two sets of switching devices arranged side by side along the width direction of the circuit breaker, a partition structure for separating adjacent switching devices is provided in the lower region.

[0029] For the circuit breaker of the present invention, in this embodiment of the circuit breaker, its structural layout is reasonable and compact, improving the utilization efficiency of the internal space of the circuit breaker. Each structure is independent of each other, facilitating assembly. Moreover, the combined use of the arc extinguishing chamber and the zero flashover mechanism significantly improves the arc extinguishing performance of the circuit breaker and prevents the arc from escaping from the circuit breaker.

[0030] In addition, the connection mode between the drive frame and the moving contact assembly is simple, facilitating assembly and simplifying the operation.

[0031] In addition, the quick-acting mechanism realizes the short-circuit protection function, and has a simple structure and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a projection view of the circuit breaker of the present invention perpendicular to its width direction;

[0033] Figure 2 is the first exploded view of the circuit breaker of the present invention;

[0034] Figure 3 is the second exploded view of the circuit breaker of the present invention;

[0035] Figure 4 is the first sectional view of the circuit breaker of the present invention, with its moving contact and static contact disconnected;

[0036] Figure 5 is the second sectional view of the circuit breaker of the present invention, with its moving contact and static contact closed;

[0037] Figure 6 is a schematic structural diagram of the circuit breaker of the present invention with the housing removed, showing the connection relationship between the drive frame, the linkage rod, and the moving contact assembly;

[0038] Figure 7 is a schematic structural diagram of the contact unit of the present invention;

[0039] Figure 8 is a schematic structural diagram of the contact mechanism of the present invention;

[0040] Figure 9 is a schematic structural diagram of the moving contact assembly of the present invention;

[0041] Figure 10is the third cross-sectional view of the circuit breaker of the present invention, showing the assembly relationship between the quick-acting mechanism and the drive frame;

[0042] Figure 11 is the present invention Figure 10 schematic enlarged structure diagram of part P;

[0043] Figure 12 is the fourth cross-sectional view of the circuit breaker of the present invention, in which the trigger member triggers the auxiliary switch to switch it from the closed state to the open state;

[0044] Figure 13 is the schematic structure diagram of the drive frame of the present invention;

[0045] Figure 14 is the schematic structure diagram of the trigger member of the present invention;

[0046] Figure 15 is the exploded view of the zero arc-flash mechanism of the present invention.

[0047] Description of reference numerals

[0048] 110 housing, 110c housing cover; 110b housing base; s1 upper region, s2 lower region, s20 contact region, s21 arc extinguishing region;

[0049] g drive frame guiding structure;

[0050] o operating device;

[0051] s200 electromagnetic system; 210 electromagnetic coil, 220 main yoke, 230 main armature;

[0052] 310 drive frame, 3100 drive frame bearing part, 3100c bearing part installation bin, 31000 installation bin cavity, 31001 yoke guiding part, 31002 installation bin opening, 3100g armature installation groove, 3100p drive frame jack, 3101 drive frame linkage part, 31010 linkage part hole, 3102 reset spring seat; 320 main reset part; 330 linkage rod; 340 connecting plate, 3401 connecting section, 3402 cooperating section;

[0053] d switching device;

[0054] c contact unit;

[0055] 400 unit housing, 400e exhaust port of unit housing, 400h half housing, 400g guiding hole of unit housing, 400p jack of unit housing, 400s supporting guiding groove; 410 arc extinguishing chamber, 410e arc extinguishing grid; 420 contact mechanism; 421 moving contact assembly; 4210 contact support, 42100 support body, 42100c body connection hole, 42100u top wall of body, 42100l bottom wall of body, 42100s side wall of body, 42100o body opening, 42100p body jack, 42101 support guiding part, 4211 moving contact, 42111 arcing horn, 4212 contact spring; 422 static contact group; 4220 static contact, 42201 contact short arm, 42202 contact long arm, 42203 yoke clamping groove; 4221 magnetic flux increasing block; 430 zero arcing mechanism, 4300 mechanism housing, 43000 arc extinguishing channel, 43001 arc extinguishing plate jack, 4301 arc extinguishing plate; 440u upper arcing plate, 440l lower arcing plate;

[0056] 500 quick-acting mechanism, 510 - 520 electromagnetic structure, 510 auxiliary yoke, 520 auxiliary armature, 530 auxiliary reset part, 540 trigger part, 540b trigger part body, 5400 trigger part top plate, 5401 trigger part base plate, 5402 trigger part side plate, 5403 trigger boss, 5404 driven part of trigger part, 550 trigger part reset part, 560 auxiliary switch; Detailed implementation manners

[0057] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation manners of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0058] As Figures 1 - 15 shown, it is an embodiment of the circuit breaker of the present invention. The circuit breaker in this embodiment is preferably a contactor-type circuit breaker.

[0059] As Figures 2 - 6As shown, the circuit breaker of this embodiment includes a housing 110, an operating device o disposed in the housing 110, and at least one group of switch devices d. The operating device o includes an electromagnetic system 200, a transmission frame 310, and a main reset member 320. The electromagnetic system 200 includes a coil assembly and a main armature 230 used in conjunction with each other. The coil assembly includes a main magnetic yoke 220 and an electromagnetic coil 210 sleeved on the main magnetic yoke 220. The main armature 230 is fixedly connected to the transmission frame 310 and moves synchronously. The main reset member 320 acts on the main armature 230 (directly or indirectly) to make it have a movement tendency to separate from the main magnetic yoke 220. Each group of switch devices d includes a contact unit c, and the contact unit c includes a contact mechanism 420. The contact mechanism 420 includes a movable contact assembly 421 and a static contact group 422 used in conjunction with each other. The transmission frame 310 is transmission-connected to the movable contact assembly 421. The electromagnetic system 200 is powered, that is, the electromagnetic system 200 is connected to the working power supply, and the coil assembly generates a magnetic field to make the main yoke 220 attract the main armature 230, and the main armature 230 drives the moving contact assembly 421 to move through the transmission frame 310, so that the moving contact assembly 421 and the static contact group 422 are closed, that is, the circuit breaker is closed; the electromagnetic system 200 is de-energized, that is, the working power supply of the electromagnetic system 200 is cut off, the magnetic field of the coil assembly disappears, the main reset member 320 drives the armature 230 to separate from the main yoke 220 and reset, and at the same time, the transmission frame 310 drives the moving contact assembly 421 and the static contact group 422 to disconnect, that is, the circuit breaker is opened.

[0060] Furthermore, the contact unit c also includes an arc extinguishing chamber 410 used in conjunction with the contact mechanism 420. Furthermore, the switch device d also includes a zero arcing mechanism 430, and the exhaust port of the arc extinguishing chamber 410 is connected to the outside through the zero arcing mechanism 430, that is, the gas exhausted from the arc extinguishing chamber 410 is discharged from the inside of the circuit breaker through the zero arcing mechanism 430 and enters the external environment where the circuit breaker is located; the zero arcing mechanism 430 cooperates with the arc extinguishing chamber 410 to ensure that the arc generated by the contact mechanism 420 is completely extinguished to prevent the arc from moving out of the circuit breaker.

[0061] like Figures 1 - 2 , 4-6, 10, and 12 are a layout of the circuit breaker of this embodiment:

[0062] like Figure 1As shown, in the projection perpendicular to the width direction of the circuit breaker, the housing 110 includes an upper area s1 and a lower area s2 arranged side by side along the height direction of the circuit breaker, and the lower area s2 includes a contact area s20 and an arc extinguishing area s21 arranged side by side along the length direction of the circuit breaker; the length direction, width direction and height direction of the circuit breaker are preferably the directions of the three coordinate axes of the three-dimensional coordinate system, that is, in space, the length direction, width direction and height direction of the circuit breaker are perpendicular to each other. The electromagnetic system 200 is arranged in the upper area s1, and the transmission frame 310 extends from the upper area s1 to the lower area s2 to be connected to the moving contact assembly 421 of each switch device d and drive the moving contact assembly 421 to move. In the switch device d, the contact unit c is arranged in the contact area s20, and the zero arcing mechanism 430 is arranged in the arc extinguishing area s21.

[0063] The circuit breaker of this embodiment adopts an operating device and a contact mechanism similar to those of a contactor, which greatly improves the service life; and its structural layout is reasonable and compact (especially the coil assembly, the main armature and the transmission frame are reasonably arranged and easy to assemble), which improves the utilization efficiency of the internal space of the circuit breaker. The various structures are independent of each other and easy to assemble. In addition, the combined use of the arc extinguishing chamber 410 and the zero arcing mechanism 430 significantly improves the arc extinguishing performance of the circuit breaker and prevents the arc from escaping the circuit breaker.

[0064] Further, such as Figure 2 As shown, the circuit breaker of this embodiment includes at least two groups of switch devices d, that is, the circuit breaker of this embodiment includes two or more groups of switch devices d, each switch device d is arranged side by side along the width direction of the circuit breaker and is arranged in the lower area s2. Specifically, the circuit breaker of this embodiment is a three-phase circuit breaker, which includes three groups of switch devices d arranged side by side along the width direction of the circuit breaker, and the three groups of switch devices d are arranged in the lower area s2. Those skilled in the art can adjust the number of switch devices d according to actual needs.

[0065] Further, such as Figure 2 , 4 As shown in , 5, the coil assembly, the main armature 230, and the transmission frame 310 are sequentially arranged along the height direction of the circuit breaker. Further, the main reset member 320 is a main reset spring, and four main reset springs are distributed at four vertices of a rectangle and arranged around the coil assembly, and the two ends of each main reset spring are respectively matched with the housing 110 and the transmission frame 310.

[0066] Further, such as Figure 4 and 5As shown, in the housing 110, two arc extinguishing regions s21 are respectively located on both sides of the contact region s20 in the length direction of the circuit breaker. That is, the housing 110 includes two arc extinguishing regions s21 and one contact region s20, and the two arc extinguishing regions s21 are located on both sides of the contact region s20 in the length direction of the circuit breaker. In the switching device d, the static contact group 422 includes two sets of static contacts 4220 arranged side by side in the length direction of the circuit breaker. The two ends of the moving contact 4211 of the moving contact assembly 421 are synchronously closed and disconnected from the two sets of static contacts 4220 respectively. The two sets of arc extinguishing chambers 410 are respectively located on both sides of the contact mechanism 420 in the length direction of the circuit breaker. The two sets of zero flashover mechanisms 430 are respectively matched with the two sets of arc extinguishing chambers 410 (that is, the exhaust ports of the two sets of arc extinguishing chambers 410 are respectively communicated with the outside of the circuit breaker through the two sets of zero flashover mechanisms 430), and are respectively located on both sides of the contact unit c in the length direction of the circuit breaker and are respectively arranged in the two arc extinguishing regions s21. Specifically, the moving contact assembly 421 moves towards the static contact group 422 to make the moving contact 4211 close with the two sets of static contacts 4220, and the moving contact assembly 421 moves away from the static contact group 422 to make the moving contact 4211 disconnect from the two sets of static contacts 4220. Each set of the switching device d includes two sets of arc extinguishing chambers 410 and two sets of zero flashover mechanisms 430. The two sets of arc extinguishing chambers 410 are located on both sides of the corresponding contact mechanism 420 in the length direction of the circuit breaker, and the two sets of zero flashover mechanisms 430 are located on both sides of the corresponding two sets of arc extinguishing chambers 410 in the length direction of the circuit breaker. That is, the two sets of zero flashover mechanisms 430 are located on both sides of the corresponding contact unit c in the length direction of the circuit breaker. Further, the electromagnetic system 200, the static contact group 422 and the moving contact assembly 421 are arranged side by side in sequence along the height direction of the circuit breaker. That is, in each set of the contact mechanisms 420, the static contact group 422 and the moving contact assembly 421 are arranged side by side along the height direction of the circuit breaker, and the static contact group 422 is located between the electromagnetic system 200 and the moving contact assembly 421. Further, the arc extinguishing chamber 410 and the zero flashover mechanism 430 located on the same side of the contact mechanism 420 are side by side with the end of the contact long arm 42202 of the corresponding static contact 4220 protruding from the contact short arm 42201 in the height direction of the circuit breaker, and the arc extinguishing chamber 410 and the zero flashover mechanism 430 are side by side with the contact short arm 42201 of the corresponding static contact 4220 in the length direction of the circuit breaker. That is, in each static contact 4220, taking the extending direction of the contact short arm 42201 and the contact long arm 42202 as the third direction and the side-by-side direction of the contact short arm 42201 and the contact long arm 42202 as the fourth direction, an arc extinguishing system avoidance space is located on one side of the contact short arm 42201 and is side by side with it in the third direction and is located on one side of the contact long arm 42202 and is side by side with it in the fourth direction. The above structural design is beneficial to further improving the structural compactness of the internal layout of the circuit breaker and reducing the occupied space.

[0067] Further, as shown in Figure 3 and 6 shown, the drive frame 310 includes at least one set of drive frame linkage parts 3101 that are drivingly connected to the moving contact assembly 421. Arrangement spaces for arranging the contact mechanism 420 are provided on both sides of the drive frame linkage part 3101, that is, the drive frame linkage part 3101 and the contact mechanism 420 are arranged side by side. The drive frame linkage part 3101 and the switch device d are arranged side by side in the width direction of the circuit breaker. The drive frame linkage part 3101 is preferably drivingly connected to the moving contact assembly 421 of the switch device d through a linkage rod 330. The relative positional relationship between the drive frame linkage part and the contact mechanism facilitates the connection between the drive frame and the contact mechanism, and the assembly is simple; moreover, the drive frame linkage part and the moving contact assembly are drivingly connected through a linkage rod, and the assembly is simple and the transmission is reliable. Further, the circuit breaker of this embodiment includes at least two sets of switch devices d, and the switch devices d are arranged side by side in the width direction of the circuit breaker. The drive frame 310 includes at least one drive frame linkage part 3101, and one drive frame linkage part 3101 is provided between every two adjacent sets of switch devices d; in other words, the circuit breaker of this embodiment includes n switch devices d, n≥2, the drive frame 310 includes m drive frame linkage parts 3101, m≥1, and in the circuit breaker of this embodiment, m=n - 1 is preferably used to ensure the balance of the force on the drive frame 310 and the synchronization of the closing and opening of each switch device d; of course, when n≥3, the value range of m can be [1, (n - 1)], that is, the value of m is not limited to n - 1. Alternatively, the circuit breaker of this embodiment includes at least two sets of switch devices d, and the switch devices d are arranged side by side in the width direction of the circuit breaker. The drive frame 310 includes two drive frame linkage parts 3101, and each switch device d is arranged between the two drive frame linkage parts 3101, and the two drive frame linkage parts 3101 are both drivingly connected to the moving contact assembly 421 of each switch device d. Alternatively, when the circuit breaker of this embodiment includes only one set of switch devices d, that is, when the circuit breaker is a single-phase circuit breaker (1P), the drive frame 310 includes two drive frame linkage parts 3101, and an arrangement space is provided between the two drive frame linkage parts 3101, that is, the two drive frame linkage parts 3101 are located on both sides of a switch device d and are respectively drivingly connected to the moving contact assembly 421 of the switch device d.

[0068] Specifically, the circuit breaker of this embodiment includes three sets of switch devices d arranged side by side in the width direction of the circuit breaker. The drive frame 310 includes two drive frame linkage parts 3101 arranged side by side in the width direction of the circuit breaker, and one drive frame linkage part 3101 is provided between every two adjacent sets of switch devices d. Each switch device d and each drive frame linkage part 3101 are preferably drivingly connected to each other through a linkage rod 330.

[0069] As shown in Figure 2 and 4As shown in FIG. -6, the circuit breaker of this embodiment further includes at least one set of quick-acting mechanism 500, which is used to cut off the power supply of the electromagnetic system 200 when a short-circuit fault occurs in the circuit where the corresponding switching device d is located (i.e., the main circuit where the corresponding moving contact assembly 421 is located). Further, the quick-acting mechanism 500 is arranged side by side with the main armature 230 in the length direction of the circuit breaker, and each set of switching devices d is used in cooperation with at least one set of quick-acting mechanism 500.

[0070] The following is the first cooperation mode between the quick-acting mechanism 500 and the electromagnetic system 200:

[0071] The electromagnetic system 200 further includes a control circuit board, which is connected to the electromagnetic coil 210 of the electromagnetic system 200 for cutting off and restoring the power supply of the electromagnetic coil 210; each set of the quick-acting mechanism 500 includes an auxiliary switch 560, and the auxiliary switch 560 is connected to the control circuit board; when a short-circuit fault occurs in the circuit where the switching device d is located (i.e., the main circuit where the corresponding moving contact assembly 421 is located), the auxiliary switch 560 switches its state (for example, the auxiliary switch 560 switches from the conducting state to the non-conducting state; or the auxiliary switch 560 switches from the non-conducting state to the conducting state; or the auxiliary switch 560 includes two-way contact structures, namely the first-way contact structure and the second-way contact structure, the first-way contact structure is a normally closed contact, and the second-way contact structure is a normally open contact, and the switching of the auxiliary switch 560 means that the normally closed contact is disconnected while the normally open contact is closed) and outputs a control signal to the control circuit board, and the control circuit board cuts off the power supply of the electromagnetic coil 210; after the short-circuit fault is eliminated, the auxiliary switch 560 resets, and then the control circuit board restores the power supply of the electromagnetic coil 210. The quick-acting mechanism 500 realizes the short-circuit protection function of the circuit breaker, and can quickly cut off the circuit when a short-circuit current appears in the circuit where the circuit breaker is located, so as to realize the short-circuit protection of other electrical equipment connected in the circuit; moreover, the auxiliary switch 560 is arranged on the drive frame 310 on one side of the main armature 230, which can effectively shorten the connection line between the auxiliary switch 560 and the electromagnetic coil 210 of the electromagnetic system 200 and simplify the internal circuit layout of the circuit breaker; moreover, the quick-acting mechanism 500 has a simple structure and is convenient for assembly. Further, the auxiliary switch 560 of the quick-acting mechanism 500 is arranged on the drive frame 310.

[0072] Further, in the circuit breaker of this embodiment, the control circuit board is also used to connect a remote communication control device (such as a host computer), and the remote communication control device can remotely conduct and cut off the power supply of the electromagnetic coil 210 through the control circuit board and monitor the power supply state of the electromagnetic coil 210, etc. Further, the control circuit board is arranged in the upper region s1 and is arranged side by side with the electromagnetic system 200; the control circuit board and the electromagnetic system 200 can be arranged side by side along the length direction of the circuit breaker or along the width direction of the circuit breaker.

[0073] In this embodiment, the circuit breaker preferably adopts the first cooperation mode of the quick-acting mechanism 500 and the electromagnetic system 200.

[0074] The following is the second cooperation mode of the quick-acting mechanism 500 and the electromagnetic system 200:

[0075] Each group of the quick-acting mechanisms 500 includes an auxiliary switch 560 connected in series in the power supply circuit of the electromagnetic system 200, that is, the closing and opening of the auxiliary switch 560 will cause the conduction and disconnection of the power supply circuit of the electromagnetic coil 210 of the electromagnetic system 200. The auxiliary switch 560 is a normally closed switch, that is, without considering factors other than the auxiliary switch 560, the power supply circuit of the electromagnetic system 200 remains in a conducting state; when a short-circuit fault occurs in the circuit where the switch device d is located (that is, the main circuit where the corresponding moving contact assembly 421 is located), the corresponding quick-acting mechanism 500 acts to trigger the auxiliary switch 560 to open, cut off the power supply circuit of the electromagnetic system 200 to de-energize the electromagnetic system 200, then the electromagnetic coil 210 stops generating a magnetic field, and the main armature 230 moves away from the main magnetic yoke 220 under the drive of the main resetting member 320. At the same time, the transmission frame 310 moves synchronously with the main armature 230 to drive the moving contact assemblies 421 of the respective switch devices d to disconnect from the static contact groups 422, and finally the circuit breaker trips.

[0076] Further, the quick-acting mechanism 500 further includes an electromagnetic structure 510-520. The electromagnetic structure 510-520 includes an auxiliary yoke 510, an auxiliary armature 520, and an auxiliary reset member 530. The auxiliary yoke 510 is disposed on the static contact set 422 of the corresponding switching device d. The auxiliary armature 520 is disposed on the transmission frame 310. The auxiliary reset member 530 acts on the auxiliary armature 520 to give it a movement tendency to separate from the auxiliary yoke 510, that is, the auxiliary reset member 530 applies a force to the auxiliary armature 520 to enable it to separate from the auxiliary yoke 510. The auxiliary armature 520 and the auxiliary yoke 510 are arranged side by side along the height direction of the circuit breaker. When a short-circuit fault occurs in the circuit where the switching device d is located, the auxiliary yoke 510 of the corresponding quick-acting mechanism 500 attracts the auxiliary armature 520 to move it. The auxiliary armature 520 triggers the auxiliary switch 560 to switch states, and the auxiliary switch 560 outputs a control signal to the control circuit board, and the control circuit board cuts off the power supply of the electromagnetic system 200. Further, in the quick-acting mechanism 500, the auxiliary armature 520 is slidably disposed on the transmission frame 310, and it can move towards the auxiliary yoke 510 to be attracted to the auxiliary yoke 510 and can move in a direction away from the auxiliary yoke 510 to separate from the auxiliary yoke 510. Further, the quick-acting mechanism 500 further includes a trigger member 540 disposed on the transmission frame 310. The auxiliary armature 520 is in transmission cooperation with the trigger member 540 to drive the trigger member 540 to move. The trigger member 540 is used to trigger the auxiliary switch 560 to disconnect. The trigger member 540 is preferably made of an insulating material, and the insulating material can be an existing insulating material in the art. The auxiliary armature 520 triggers the auxiliary switch 560 through the trigger member 540, and the transmission is stable and reliable, which is convenient for the design of the transmission link and the internal layout. Moreover, the trigger member 540 is beneficial to increasing the insulation gap and creepage distance between the auxiliary switch 560 and the main circuit where the moving contact assembly is located (that is, the corresponding switching device d), avoiding short circuits between the power supply circuit of the electromagnetic coil and the main circuit where the moving contact assembly is located, ensuring the reliable operation of the quick-acting mechanism 500, and ensuring the reliability of the quick-acting device.

[0077] Further, the drive frame 310 further includes a drive frame bearing portion 3100 located between the coil assembly and the switching device d in the height direction of the circuit breaker. The main armature 230 of the electromagnetic system 200 is disposed on and fixedly connected to the drive frame bearing portion 3100, so that the main armature 230 moves synchronously with the drive frame 310. The auxiliary armature 520, the auxiliary reset member 530, and the auxiliary switch 560 of the quick-acting mechanism 500 are all disposed on the drive frame bearing portion 3100. Further, the drive frame 310 further includes a bearing portion installation bin 3100c corresponding to and cooperating with the quick-acting mechanism 500 one by one. The bearing portion installation bin 3100c is preferably disposed on the drive frame bearing portion 3100. The auxiliary armature 520 and the auxiliary reset member 530 are both disposed in the bearing portion installation bin 3100c, and the auxiliary switch 560 is disposed outside the bearing portion installation bin 3100c. Further, the trigger member 540 is also disposed outside the bearing portion installation bin 3100c.

[0078] As an embodiment, the circuit breaker of this embodiment includes two or more groups of switching devices d arranged side by side in the width direction of the circuit breaker. The switching devices d correspond to and cooperate with the quick-acting mechanisms 500 one by one. Each quick-acting mechanism 500 is arranged side by side in the width direction of the circuit breaker. The adjacent two groups of quick-acting mechanisms 500 share the auxiliary switch 560, and the auxiliary switch 560 is arranged between the two bearing portion installation bins 3100c corresponding to and cooperating with the adjacent two groups of quick-acting mechanisms 500, which is beneficial to reducing the number of components of the circuit breaker and saving costs. Further, the adjacent two groups of quick-acting mechanisms 500 also share the trigger member 540 and the trigger member reset member 550 for driving the trigger member 540 to reset. The trigger member reset member 550 acts on the trigger member 540 to release the trigger state of the auxiliary switch 560, so that the auxiliary switch 560 is switched from the off state to the on state. Of course, each quick-acting mechanism 500 can also be provided with an independent auxiliary switch 560 and trigger member 540 that are not shared with other quick-acting mechanisms 500, which will lead to an increase in the occupied space of the structure and an increase in production costs.

[0079] As an embodiment, the static contact 4220 is arranged and matched with the quick-acting mechanism 500 one by one. The two groups of quick-acting mechanisms 500 matched with the static contact group 422 of the same set of switch devices d are respectively arranged on both sides of the main armature 230, which also means that the bearing part installation bins 3100c matched with the two groups of quick-acting mechanisms 500 are also respectively arranged on both sides of the main armature 230. Further, in the length direction of the circuit breaker of this embodiment, among the multiple quick-acting mechanisms 500 located on the same side of the main armature 230, two adjacent groups of quick-acting mechanisms 500 share an auxiliary switch 560, and this auxiliary switch 560 is located between the two bearing part installation bins 3100c respectively matched with the two adjacent groups of quick-acting mechanisms 500. Specifically, in the circuit breaker of this embodiment, each set of switch devices d is correspondingly arranged and matched with two groups of quick-acting mechanisms 500. That is to say, the circuit breaker includes three sets of switch devices d and six groups of quick-acting mechanisms 500. Among them, three groups of quick-acting mechanisms 500 are arranged side by side in the width direction of the circuit breaker and are located on one side of the main armature 230 in the length direction of the circuit breaker, and the other three groups of quick-acting mechanisms 500 are arranged side by side in the width direction of the circuit breaker and are located on the other side of the main armature 230 in the length direction of the circuit breaker. That is to say, the two sides of the main armature 230 in the length direction of the circuit breaker are respectively the first side and the second side. Three groups of quick-acting mechanisms 500 are located on the first side and are arranged side by side in the width direction of the circuit breaker, and the other three groups of quick-acting mechanisms 500 are located on the second side and are arranged side by side in the width direction of the circuit breaker.

[0080] The following will be combined with Figures 2 - 6 , Figures 10 - 13, to further describe the operating device o.

[0081] As Figures 2 - 3 shown, the main yoke 220 of the operating device o is an E-shaped yoke, which includes three main yoke arms arranged side by side at intervals. The electromagnetic coil 210 is sleeved on the main yoke arm located in the middle; the main armature 230 of the operating device o includes three main armature mating bosses arranged side by side at intervals, and the three main armature mating bosses are respectively matched with the three main yoke arms; the main yoke 220 and the main armature 230 with the above structure enable the main armature 230 to act faster under the attraction of the coil assembly, and ensure the reliability of the attracted state of the main yoke 220 and the main armature 230.

[0082] As Figure 3 , 6As shown in 12-13, in the transmission frame 310, the transmission frame linkage part 3101 is arranged on one side of the transmission frame bearing part 3100, and the two sides of the transmission frame linkage part 3101 are respectively provided with arrangement spaces for arranging the contact mechanism 420, that is, the contact mechanism 420 can be arranged on both sides of the transmission frame linkage part 3101, and preferably one group of contact mechanisms 420 is arranged in each arrangement space, and of course two or more contact mechanisms 420 can also be arranged, that is, two or more groups of contact mechanisms 420 can be arranged on each side of the transmission frame linkage part 310. Further, the transmission frame 310 includes at least two groups of transmission frame linkage parts 3101, that is, the transmission frame 310 includes two or more groups of transmission frame linkage parts 3101, each transmission frame linkage part 3101 is preferably arranged side by side along the width direction of the circuit breaker and is respectively connected to the transmission frame bearing part 3100, and an arrangement space is arranged between two adjacent transmission frame linkage parts 3101, and one arrangement space is arranged on both sides of the two transmission frame linkage parts 3101 located at both ends. Further, the transmission frame linkage part 3101 is a straight plate structure. Specifically, in the circuit breaker of this embodiment, the transmission frame 310 includes two groups of transmission frame linkage parts 3101, the two groups of transmission frame linkage parts 3101 are arranged side by side along the width direction of the circuit breaker, a group of contact mechanisms 420 are arranged between the two groups of transmission frame linkage parts 3101, and a group of contact mechanisms 420 are arranged on both sides of the two groups of transmission frame linkage parts 3101, that is, the contact mechanisms 420 and the transmission frame linkage parts 3101 are arranged alternately in sequence, and each transmission frame linkage part 3101 and the moving contact assembly 421 of each contact mechanism 420 are connected to each other through the linkage rod 330. Further, each group of the transmission frame linkage parts 3101 is provided with a linkage part hole 31010 for the linkage rod 330 to pass through, and preferably, the two linkage part holes 31010 are arranged side by side and spaced along the length direction of the circuit breaker. The connection method of the transmission frame 310 and the moving contact assembly 421 is simple, easy to assemble, and simplified in operation.

[0083] Further, such as Figures 3 - 5As shown, the carrier portion 3100 of the drive frame includes an armature mounting groove 3100g provided on the side thereof facing the electromagnetic system 200; the operating mechanism o further includes at least one connecting plate 340. The main armature 230 is arranged in the armature mounting groove 3100g. The connecting plate 340 is inserted in the middle of the main armature 230 and its two ends are respectively inserted into a pair of side walls of the armature mounting groove 3100. Specifically, each of the pair of side walls of the armature mounting groove 3100g is provided with a drive frame insertion hole 3100p, and the two ends of the connecting plate 340 are respectively inserted into the two drive frame insertion holes 3100p. Further, the connecting plate 340 includes a connecting section 3401 and a mating section 3402. The two connecting sections 3401 are respectively connected to both ends of the mating section 3402. The two connecting sections 3401 are coplanar and offset to the same side of the mating section 3402. The connecting section 3401 is arranged parallel to the mating section 3402; a main armature mounting hole is provided in the middle of the main armature 230. The connecting plate 340 is inserted into the main armature mounting hole. A part of the mating section 3402 and each connecting section 3401 is located in the main armature mounting hole. Among the pair of side surfaces of the main armature mounting hole, one is in interference fit with the mating section 3402, and the other is in interference fit with the connecting section 3401, so as to ensure that the connecting plate 340 is reliably limited in the main armature mounting hole, and to prevent the separation of the main armature 230 and the drive frame 310 during the operation of the main armature 230 and the drive frame 310 due to the connecting plate 340 being disengaged from the main armature mounting hole.

[0084] As Figure 3 and 10 As shown, the operating device o further includes a drive frame guiding structure g corresponding to the drive frame linkage portion 3101 one by one. The drive frame guiding structure g is arranged on the housing structure for accommodating the contact mechanism 420. The drive frame linkage portion 3101 is in sliding and limiting fit with the drive frame guiding structure g, that is, the drive frame linkage portion 3101 can slide relative to the drive frame guiding structure g, and the limiting of the drive frame linkage portion 3101 and the drive frame guiding structure g enables the drive frame linkage portion 3101 to slide only along the extending direction of the drive frame guiding structure g. Further, the drive frame guiding structure g is a drive frame guiding hole, and the drive frame linkage portion 3101 is slidably inserted into the drive frame guiding hole. Further, the drive frame guiding hole is arranged at the adjacent joint of two adjacent contact units c and is formed by the relative splicing of the linkage portion guiding grooves provided on the unit housings 400 of the two adjacent contact units c respectively. As another embodiment, when the contact unit c does not have the unit housing 400, the adjacent contact units c are separated by a partition provided in the outer housing 110, then the drive frame guiding structure g can be arranged on the partition of the outer housing 110 for separating the adjacent contact units c.

[0085] As Figures 2 - 6, as shown in FIGS. 10-11 and 13, the carrier frame bearing part 3100 further includes a bearing part installation bin 3100c corresponding to and cooperating with the quick-acting mechanism 500 one by one. The bearing part installation bin 3100c includes an installation bin cavity 31000 provided therein. The auxiliary armature 520 and the auxiliary reset member 530 of the quick-acting mechanism 500 are arranged in the installation bin cavity 31000. Specifically, in the carrier frame 310 of this embodiment, three bearing part installation bins 3100c are arranged side by side along the width direction of the circuit breaker and are located on one side of the armature installation groove 3100g in the length direction of the circuit breaker, and the other three bearing part installation bins 3100c are arranged side by side along the width direction of the circuit breaker and are located on the other side of the armature installation groove 3100g in the length direction of the circuit breaker; that is, on both sides of the armature installation groove 3100g in the length direction of the circuit breaker in this embodiment, three bearing part installation bins 3100c are provided on each side.

[0086] Furthermore, two installation bin openings 31002 are provided on the bin wall of the bearing part installation bin 3100c for the two auxiliary armature arms of the auxiliary armature 520 to pass through and cooperate with the auxiliary yoke 510. Further, the bearing part installation bin 3100c includes a pair of installation bin side walls arranged oppositely and an installation bin bottom wall bent and connected to the two installation bin side walls at both ends respectively. An installation bin opening 31002 is provided at the bent connection of each installation bin side wall and the installation bin bottom wall. As other embodiments, the two installation bin openings 31002 can also be provided at the ends where the installation bin bottom wall is connected to the two installation bin side walls respectively.

[0087] Furthermore, the bearing part installation bin 3100c further includes a yoke guiding part 31001 arranged in the bearing part installation bin 3100c. The two yoke guiding parts 31001 are arranged side by side at intervals and cooperate with a pair of installation bin inner sides of the bearing part installation bin 3100c (that is, the inner sides of the two installation bin side walls) to form two groups of yoke guiding and limiting structures. Each auxiliary armature arm is located between the yoke guiding part 31001 of the corresponding yoke guiding and limiting structure and the installation bin inner side, so as to limit the movement of the auxiliary yoke 520 along the direction in which its two auxiliary yoke arms are arranged side by side, ensure the stable relative position between the auxiliary yoke 520 and the auxiliary armature 510, and thus realize reliable cooperation.

[0088] Further, a spring fitting groove is provided on the outer side of the wall of the bearing part installation bin 3100c. One end of the spring fitting groove is provided with a spring limiting platform. The trigger part return spring is arranged in the spring fitting groove, with one end cooperating with the trigger part top plate 5400 of the trigger part 540 and the other end cooperating with the spring limiting platform. Further, the cross-section of the spring fitting groove is arc-shaped. Among adjacent bearing part installation bins 3100c, spring fitting grooves are provided on the outer sides of adjacent two bin walls. The two spring fitting grooves are relatively fitted to form a spring accommodation cavity for accommodating the trigger part return spring, and the radial ends of the trigger part return spring are respectively located in the two spring fitting grooves.

[0089] The following will be combined with Figures 3 - 9 to further illustrate the switch device d.

[0090] As Figures 4 - 5 shown, the switch device d includes a contact unit c and two groups of zero arc-flash mechanisms 430 that cooperate with the contact unit c. In the length direction of the circuit breaker, the two groups of zero arc-flash mechanisms 430 are respectively arranged on both sides of the contact unit c. The contact unit c includes a contact mechanism 420 and an arc extinguishing chamber 410. In the length direction of the circuit breaker, the two groups of arc extinguishing chambers 410 are respectively arranged on both sides of the contact mechanism 420. The contact mechanism 420 includes a moving contact assembly 421 and a static contact group 422. The static contact group 422 includes two groups of static contacts 4220 arranged side by side in the length direction of the circuit breaker. The moving contact assembly 421 includes a moving contact 4211 arranged opposite to the static contact group 422. Two moving contacts are respectively arranged at both ends of the moving contact 4211 and cooperate with the static contacts of the two groups of static contacts 4220. The exhaust ports of each group of arc extinguishing chambers 410 are respectively communicated with the outside through the corresponding zero arc-flash mechanisms 430.

[0091] As Figures 4 - 5, as shown in FIGS. 7-8, the static contact 4220 is of a U-shaped structure and includes a contact short arm 42201 and a contact long arm 42202 that is opposite to and longer than the contact short arm 42201. That is, the contact long arm 42202 is disposed opposite to the contact short arm 42201 and the length of the contact long arm 42202 is greater than the length of the contact short arm 42201. The contact short arm 42201 is provided with a static contact that cooperates with the moving contact of the moving contact 4211. The static contact is preferably disposed at the free end of the corresponding contact short arm 42201. Further, in the static contact group 422, the contact long arm 42202 of at least one group of static contacts 4220 is used to pass through the middle of the auxiliary yoke 510 of the quick-acting mechanism 500 and cooperate with it in a limiting manner to prevent the auxiliary yoke 510 from moving away from the moving contact 4211. That is, the contact long arm 42202 passes through the middle of the auxiliary yoke 510 as an auxiliary conductor of the quick-acting mechanism 500. The contact long arm 42202 is in relative limiting cooperation with the auxiliary yoke bottom of the auxiliary yoke 510 to prevent the auxiliary yoke 510 (preferably in the height direction of the circuit breaker) from moving away from the moving contact 4211. The contact long arm 42202 is further provided with a yoke card slot 42203 for cooperating with the auxiliary yoke 510 in a clamping manner to prevent the auxiliary yoke 510 from moving along the extending direction of the contact long arm 42202. That is, the auxiliary yoke arm of the auxiliary yoke 510 is clamped in the yoke card slot 42203 provided on the contact long arm 42202, thereby preventing the auxiliary yoke 510 from moving along the extending direction of the contact long arm 42202. The static contact adopts a U-shaped structure. When the moving contact and the static contact are separated, the arc generated is affected by the Lorentz force and can be moved out between the moving contact and the static contact more quickly, reducing the burning of the moving contact and the static contact. The structural design of the contact long arm and the contact short arm of the static contact and the yoke card slot of the contact long arm are more convenient for cooperation with the quick-acting mechanism and convenient for assembly. In particular, the cooperation between the contact long arm 42202 and the auxiliary yoke 510 not only ensures the reliable installation of the auxiliary yoke 510 but also realizes the precise positioning of the position of the auxiliary yoke 510. Further, the yoke card slot 42203 is provided on the side edge of the contact long arm 42202. Specifically, one yoke card slot 42203 is provided on each of the pair of side edges of the contact long arm 42202, and the two auxiliary yoke arms of the auxiliary yoke 510 are located on both sides of the contact long arm 42202 and are respectively clamped in the two yoke card slots 42203. Further, the yoke card slot 42203 is provided on a section where the yoke long arm 42202 extends beyond the yoke short arm 42201.

[0092] As another embodiment, the yoke card slot 42203 can also be provided on the side of the contact long arm 42202 facing the auxiliary yoke bottom of the auxiliary yoke 510. That is, the auxiliary yoke bottom is clamped in the yoke card slot 42202, thereby preventing the auxiliary yoke 510 from moving along the extending direction of the contact long arm 42202.

[0093] like Figures 3 - 5 As shown in Figures 7-8, the contact mechanism 420 also includes two groups of magnetizing blocks 4221 respectively matched with the two groups of static contacts 4220, and each group of magnetizing blocks 4221 is arranged on the contact short arm 42201 of the corresponding static contact 4220, and is located between the contact short arm 42201 and the contact long arm 42202. Further, the magnetizing block 4221 is a U-shaped structure, wrapped on the corresponding contact short arm 42201, and the bottom of the U-shaped structure of the magnetizing block 4221 and the static contact point on the corresponding contact short arm 42201 are respectively located on both sides of the contact short arm 42201. Further, in the extension direction of the contact short arm 42201 (that is, the length direction of the circuit breaker), the length of the magnetizing block 4221 is ≥ the length of the contact point of the corresponding contact short arm 42201. The magnetizing block 4221 is helpful to guide the arc between the moving contact 4211 and the stationary contact 4220 into the arc extinguishing chamber 410, improve the arc extinguishing efficiency, and enhance the arc extinguishing effect. As another embodiment, the magnetizing block 4221 can also be a rectangular block structure, and the magnetizing block 4221 is opposite to the stationary contact point of the corresponding stationary contact 4220, and is respectively located on both sides of the contact short arm 42201 of the stationary contact 4220.

[0094] like Figures 3 - 5 As shown in 7-8, the static contact 4220 also includes an arc segment for connecting the long contact arm 42202 and the short contact arm 42201. The long contact arm 42202, the arc segment, and the short contact arm 42201 are sequentially connected and form a U-shaped structure as a whole. The short contact arm 42201 and the arc segment have the same width and are smaller than the width of the long contact arm 42202. Furthermore, the bottom wall spacing of the two yoke slots 42203 of the long contact arm 42202 is the same as the width of the short contact arm 42201. The size design of the short contact arm 42201, the arc segment, and the long contact arm 42202 facilitates the assembly of the static contact 4220 and the cooperation with the auxiliary magnet 520 of the corresponding quick-action mechanism 500.

[0095] like Figures 4 - 5 As shown in Figures 8-9, the moving contact assembly 421 also includes a contact support 4210, which is used to carry the moving contact 4211 and is used to be connected to the transmission frame 310 of the operating device o and driven to move. The contact support 4210 includes a support body 42100, and the moving contact 4211 is inserted into the support body 42100 and both ends protrude from the outside of the support body 42100.

[0096] Further, the contact support 4210 further includes a support guiding portion 42101 provided on one side of its support body 42100. The support guiding portion 42101 extends between two corresponding sets of static contacts 4220. When the moving contact 4211 is closed with the two corresponding sets of static contacts 4220, the two sets of static contacts 4220 are completely separated. The support guiding portion 42101 is also used to be inserted into a support guiding groove 400s provided on the housing structure accommodating the contact mechanism 420, so as to ensure that the moving contact assembly 421 moves along a preset path. Further, the support guiding portion 42101 is a straight plate-shaped structure. Further, the housing structure for accommodating the contact mechanism 420 further includes a static contact partition wall. The static contact partition wall is provided between two corresponding sets of static contacts 4220 to completely separate the two sets of static contacts 4220, and the support guiding groove 400s is provided in the static contact partition wall.

[0097] Further, the support body 42100 includes a pair of relatively arranged main body side walls 42100s, and relatively arranged main body top wall 42100u and main body bottom wall 42100l. The main body side walls 42100s, the main body top wall 42100u and the main body bottom wall 42100l form a square-shaped structure as a whole. The main body side walls 42100s are provided with main body insertion holes 42100p through which the moving contact 4211 passes. The moving contact 4211 and the contact spring 4212 are arranged between the main body top wall 42100u and the main body bottom wall 42100l in sequence, that is, the main body top wall 42100u, the moving contact 4211, the contact spring 4212 and the main body bottom wall 42100l are arranged in sequence along the height direction of the circuit breaker. The two ends of the contact spring 4212 are respectively matched with the moving contact 4211 and the main body bottom wall 42100l, so as to realize the over-travel of the moving contact 4211. The support guiding portion 42101 is provided on the outer side of the main body top wall 42100u. The structure of the contact support facilitates the assembly of the moving contact, the contact support and the contact spring, and has high reliability. Further, the length of the main body top wall 42100u is less than the length of the main body bottom wall 42100l, and chamfer structures are provided at both side edges of the main body top wall 42100u close to the two sets of static contacts 4200 respectively.

[0098] Further, the support body 42100 further includes a relatively arranged main body front wall and main body rear wall. The main body side walls 42100s, the main body top wall 42100u and the main body bottom wall 42100l are located between the main body front wall and the main body rear wall. The main body front wall or the main body rear wall is provided with a main body opening 42100o through which the contact spring 4212 enters the support body 42100. As other embodiments, the support body 42100 may not be separately provided with the main body opening 42100o, but a main body insertion hole 42100p serves as the main body opening 42100o.

[0099] Furthermore, the main body side wall 42100s is provided with a main body connecting hole 42100c for inserting the linkage rod 300, and the two groups of main body side walls 42100s are preferably provided with a main body connecting hole 42100c, that is, the operating device o can be connected to the contact support 421 through two linkage rods 300.

[0100] like Figure 3 , 6 As shown in FIG. 7 , the contact unit c further includes a unit housing 400 , which serves as a housing structure for accommodating a contact mechanism 420 . Furthermore, the unit housing 400 is also used to accommodate an arc extinguishing chamber 410 .

[0101] Furthermore, a grid sheet installation structure for installing a grid sheet group of the arc extinguishing chamber 410 is further provided in the unit housing 400. Preferably, two groups of grid sheet installation structures are arranged on both sides of the moving contact assembly 421. Furthermore, the unit housing 400 is provided with a unit housing exhaust port 400e as an exhaust port of the arc extinguishing chamber 410. Furthermore, a unit housing exhaust port 400e is respectively provided on two side walls of the unit housing 400 facing the two groups of zero arcing mechanisms 430.

[0102] Further, the unit housing 400 includes two half-shells 400h that are relatively assembled together, and the two half-shells 400h are assembled together along the width direction of the circuit breaker. Of course, the unit housing 400 can also be assembled along the length direction of the circuit breaker, which will not be described in detail here. Further, the static contact partition wall includes half partition walls respectively arranged on the two half-shells 400h, and the two half partition walls are assembled into a static contact partition wall.

[0103] Further, the unit housing 400 further includes a unit housing guide hole 400g, which is used for the linkage rod 300 to be inserted into the contact unit c and to be transmission-connected with the corresponding moving contact assembly 421. Further, the unit housing guide hole 400g is arranged on the side wall of the unit housing 400 facing the transmission frame linkage part 3101 of the transmission frame 310, and the unit housing guide hole 400g is preferably a waist-shaped hole, which matches the moving track of the linkage rod 300.

[0104] Furthermore, the unit housing 400 further includes a unit housing jack 400p, through which the auxiliary yoke arm of the auxiliary yoke 510 of the quick-action mechanism 500 passes to cooperate with the corresponding auxiliary armature 520. Furthermore, the unit housing jack 400p is disposed on the side wall of the unit housing 400 facing the electromagnetic system 200, and two unit housing jacks 400p are respectively disposed on the two half-shells 400h.

[0105] Furthermore, the unit housing 400 is further provided with a main body guiding and limiting structure for limiting and guiding the support main body 42100 of the contact support 4210. The main body guiding and limiting structure is a main body accommodating cavity, and the main body accommodating cavity communicates with the support guiding groove 400s.

[0106] Furthermore, the unit housing 400 further includes a linkage part guiding groove, which is arranged on the outer side surface of the unit housing 400 facing the linkage part 310 of the transmission frame 310; the linkage part guiding grooves of two adjacent unit housings 400 are oppositely joined together along the width direction of the circuit breaker to form a transmission frame guiding structure g.

[0107] For the circuit breaker of the present invention, the contact unit c is provided with an independent unit housing 400, which is beneficial to improving the insulation performance between phases of the circuit breaker, improving the internal insulation performance of the circuit breaker, thereby improving the current carrying and breaking capacity of the circuit breaker. Moreover, the contact unit c being assembled as an independent module is beneficial to improving the assembly efficiency of the circuit breaker. Furthermore, the outer shell 110 includes an outer shell cover 110c and an outer shell base 110b that are oppositely joined together along the height direction of the circuit breaker. An upper region s1 and a lower region s2 are formed in the space formed by the outer shell cover 110c and the outer shell base 110b. The upper region s1 is preferably arranged in the outer shell cover 110c, and the lower region s2 is preferably arranged in the outer shell base 110b. Further, the electromagnetic system 200 is arranged in the outer shell cover 110c, the transmission frame 310 extends from the outer shell cover 110c into the outer shell base 110b, and the switching device d is arranged in the outer shell base 110b.

[0108] Certainly, the circuit breaker of the present invention may not be provided with an independent unit housing 400, but instead a partition structure for separating each contact unit c is provided in the outer shell 110. The corresponding support guiding groove 400s, static contact partition wall, and transmission frame guiding structure g are arranged on the partition structure: for example, the outer shell 110 may adopt an upper-middle-lower structure form, that is, it includes an upper shell, a middle shell, and a lower shell that are sequentially joined together along the height direction of the circuit breaker. An upper region s1 is formed between the upper shell and the middle shell, and a lower region s2 is formed between the middle shell and the lower shell. Further, when the circuit breaker includes at least two groups (that is, two groups or more than two groups) of switching devices d, a partition structure for separating adjacent switching devices d is provided in the lower region s2, and the partition structure is arranged on the middle shell and / or the lower shell; of course, those skilled in the art may adopt other deformed structures according to needs, which will not be elaborated here and should all fall within the protection scope of the present invention.

[0109] Such as Figures 3 - 5As shown in FIGS. 6 and 7, the arc extinguishing chamber 410 includes a grid plate group, which includes a plurality of arc extinguishing grid plates 410e arranged side by side in the first direction, and the first direction is also the height direction of the circuit breaker. Further, the arc extinguishing grid plates 410e are fixedly arranged in the unit housing 400. For example, grid plate slots (not shown in the figure) for plugging and matching with both ends of the arc extinguishing grid plates 410e are provided on a pair of inner side surfaces of the unit housing 400.

[0110] As shown in Figures 3 - 5 FIGS. 6 and 7, the contact unit c further includes an arcing piece group, which is arranged in one-to-one correspondence with the arc extinguishing chamber 410. The arcing piece group includes an upper arcing piece 440u and a lower arcing piece 440l. One ends of the upper arcing piece 440u and the lower arcing piece 440l (that is, the free ends of the second section of the upper arcing piece of the upper arcing piece 440u and the second section of the lower arcing piece of the lower arcing piece 440l) are respectively used for cooperating with the corresponding static contact 4220 and the moving contact 4221, and the other ends (that is, the free ends of the first section of the upper arcing piece and the first section of the lower arcing piece) respectively extend to both sides of the grid plate group of the arc extinguishing chamber 410. Specifically, in the arcing piece group, the upper arcing piece 440u and the lower arcing piece 440l are arranged opposite to each other in the height direction of the circuit breaker.

[0111] Further, one end of the upper arcing piece 440u that cooperates with the corresponding static contact 4220, that is, the free end of the second section of the upper arcing piece of the upper arcing piece 440u, is used for contacting the corresponding static contact 4220.

[0112] Further, one end of the lower arcing piece 440l that cooperates with the corresponding moving contact 4211, that is, the free end of the second section of the lower arcing piece of the lower arcing piece 440l, is used for cooperating with the corresponding moving contact 4221 in the open position. That is, when the moving contact 4221 is in the open position, it cooperates with the free end of the corresponding lower arcing piece 440l; the minimum distance between the free end of the second section of the lower arcing piece and the corresponding moving contact 4221 in the open position is less than the minimum distance between the lower arcing piece and the arc extinguishing grid plate 410e and less than the distance between adjacent arc extinguishing grid plates 410e, which is beneficial to the transfer of the arc from the moving contact to the lower arcing piece 440l. As another embodiment, the free end of the second section of the lower arcing piece is used for contacting the corresponding moving contact in the open position.

[0113] Further, the upper arc-drawing piece 440u includes a first section of the upper arc-drawing piece and a second section of the upper arc-drawing piece that are bent and connected. The lower arc-drawing piece 440l includes a first section of the lower arc-drawing piece and a second section of the lower arc-drawing piece that are bent and connected. The first section of the upper arc-drawing piece and the first section of the lower arc-drawing piece are respectively arranged on both sides of the grid piece group of the corresponding arc extinguishing chamber 410 and are parallel to the arc extinguishing grid piece 410e. The second section of the upper arc-drawing piece and the second section of the lower arc-drawing piece are bent towards each other. That is, the free end of the second section of the upper arc-drawing piece is inclined towards the side where the lower arc-drawing piece 440l is located relative to the end of the second section of the upper arc-drawing piece connected to the first section of the upper arc-drawing piece. The free end of the second section of the lower arc-drawing piece is inclined towards the side where the upper arc-drawing piece 440u is located relative to the end of the second section of the upper arc-drawing piece connected to the first section of the upper arc-drawing piece. Further, the first section of the upper arc-drawing piece and the lower arc-drawing piece are arranged in parallel at intervals with the arc extinguishing grid piece 410e of the grid piece group.

[0114] Further, the moving contact 4221 further includes an arc-drawing angle 42111 provided on the moving contact 4221. The arc-drawing angle 42111 extends into the upper arc-drawing piece 440u and the lower arc-drawing piece 440l of the corresponding arc-drawing piece group and extends towards the grid piece group of the corresponding arc extinguishing chamber 410. Further, the arc-drawing angle 42111 is of a wedge-shaped structure. Specifically, an arc-drawing angle 42111 is provided at each end of the moving contact 4221.

[0115] As Figures 2 - 6 shown in FIGS. 10 and 15, the zero arc-flight mechanism 430 includes at least one arc extinguishing piece 4301. The arc extinguishing piece 4301 faces the exhaust port of the arc extinguishing chamber 410 and the plane where it is located is parallel to the first direction. Further, the zero arc-flight mechanism 430 includes two or more arc extinguishing pieces 4301. Each arc extinguishing piece 4301 is arranged side by side in the second direction. The second direction is perpendicular to the first direction, and the second direction is also the length direction of the circuit breaker. Further, each arc extinguishing piece 4301 is provided with a plurality of arc extinguishing holes. The arc extinguishing holes of adjacent arc extinguishing pieces 4301 are arranged in a staggered manner, so as to increase the path of the gas passing through the zero arc-flight mechanism 430, block metal particles, and enhance the arc extinguishing effect.

[0116] Further, the zero-arc mechanism 430 includes a mechanism housing 4300. The mechanism housing 4300 is provided with an arc extinguishing channel 43000 and at least one arc extinguishing plate jack 43001. The arc extinguishing plate jacks 43001 are arranged in one-to-one correspondence with the arc extinguishing plates 4301. The extending direction of the arc extinguishing channel 43000 is perpendicular to the extending direction of the arc extinguishing plate jacks 43001. One arc extinguishing plate 4301 is inserted into each arc extinguishing plate jack 43001. In the zero-arc mechanism 430, the mechanism housing 4300 and the arc extinguishing plates are easily assembled and form an independent structural module, which is convenient for assembly and individual production. Further, one end of the mechanism housing 4300 close to the electromagnetic system 200 is also provided with a nut clamping structure, such as a nut clamping hole. One end of the static contact 4220 (i.e., the free end of the contact short arm 42201) is provided with a static contact, and the other end (i.e., the free end of the contact long arm 42202) is provided with a static contact connection hole for connecting with an external wire. The static contact connection hole is correspondingly matched with the corresponding nut clamping structure, and the nut of the bolt for connecting the static contact 4220 and the external wire is arranged in the nut clamping structure.

[0117] As other embodiments, the zero-arc mechanism 430 does not have the mechanism housing 4300, but the arc extinguishing plates 4301 are installed in the unit housing 400.

[0118] As shown in Figures 2 - 6 , 10, and 15, the present invention also discloses an arc extinguishing system. The arc extinguishing system includes an arc initiating plate group, an arc extinguishing chamber 410, and a zero-arc mechanism 430. The arc initiating plate group, the arc extinguishing chamber 410, and the zero-arc mechanism 430 are arranged in one-to-one correspondence. In the switching device d, two sets of arc extinguishing systems are respectively arranged on both sides of the contact mechanism 420 in the length direction of the circuit breaker.

[0119] Further, in the arc extinguishing system, the arc initiating plate group, the arc extinguishing chamber 410, and the zero-arc mechanism 430 are arranged in sequence along the second direction, that is, arranged in sequence along the length direction of the circuit breaker. In the arc extinguishing system, the arc initiating plate group, the arc extinguishing chamber, and the zero-arc mechanism are arranged in sequence along the second direction, with a reasonable layout and space saving. Moreover, the arc extinguishing chamber and the zero-arc mechanism cooperate to improve the arc extinguishing effect and prevent the arc from escaping. Also, the structures of the upper arc initiating plate and the lower arc initiating plate are more conducive to the transfer of the arc to the arc extinguishing chamber, improving the arc extinguishing efficiency.

[0120] The following will further describe Figures 2 - 8 , 10 - 13, the quick-acting mechanism 500.

[0121] The quick-acting mechanism 500 includes an auxiliary conductor, electromagnetic structures 510-520, a trigger 540, a trigger reset member 550, and an auxiliary switch 560. The electromagnetic structures 510-520 include an auxiliary yoke 510, an auxiliary armature 520, and an auxiliary reset member 530. The auxiliary conductor passes through the middle of the auxiliary yoke 520 and is used to be connected in series with the main circuit where the moving contact assembly 421 of the corresponding switch device d is located. The auxiliary yoke 510 cooperates with the auxiliary armature 520, and the auxiliary reset member 530 acts on the auxiliary armature 520 to separate it from the auxiliary yoke 510. That is, the auxiliary reset member 530 applies a force to the auxiliary armature 520, and this force causes the auxiliary armature 520 to have a tendency to move away from the auxiliary yoke 510. The trigger reset member 550 is used to drive the trigger 540 to reset so that the trigger 540 no longer triggers the auxiliary switch 560, thereby switching the auxiliary switch 560 from the off state to the on state; when a short-circuit current flows through the auxiliary conductor, that is, when a short-circuit fault occurs in the circuit where the switch device d corresponding to the quick-acting mechanism 500 is located, the magnetic field generated by the auxiliary conductor attracts the auxiliary armature 520 through the auxiliary yoke 510 to make the auxiliary armature 520 move. The auxiliary armature 520 drives the trigger 540 to move, and the trigger 540 triggers the auxiliary switch 560 to open, that is, triggers the auxiliary switch 560 to switch from the on state to the off state. Further, the auxiliary armature 520 and the auxiliary reset member 530 are arranged in the bearing part installation bin 3100c, the trigger 540 and the auxiliary switch 560 are arranged outside the bearing part installation bin 3100c, and the trigger reset member 550 is also arranged outside the bearing part installation bin 3100c.

[0122] As another embodiment, the quick-acting mechanism 500 does not have the trigger reset member 550. Instead, the auxiliary armature 520 drives the trigger 540 to reciprocate to trigger the auxiliary switch 560 or release the auxiliary switch 560 to cancel the triggering of the auxiliary switch 560.

[0123] Further, the auxiliary conductor is served by the static contact 4220 of the corresponding switch device d.

[0124] Further, the auxiliary switch 560 is preferably a microswitch. However, the auxiliary switch 560 is not limited to a microswitch only. For example, the auxiliary switch 560 can also be an auxiliary moving contact and an auxiliary static contact used in cooperation, and the auxiliary moving contact is in transmission cooperation with the trigger 540.

[0125] Further, the auxiliary armature 520 is disposed opposite to the auxiliary yoke 510, and the auxiliary armature 520 is linearly movable. Specifically, the auxiliary armature 520 is linearly movable along the height direction of the circuit breaker. The cooperation mode of the auxiliary armature and the auxiliary yoke facilitates the layout and assembly of the quick-acting mechanism 500, and simplifies the cooperation of the quick-acting mechanism 500 with the corresponding switch device d and the transmission frame 310. As another embodiment, the auxiliary armature 520 may also be rotatably disposed.

[0126] Specifically, the auxiliary armature 520 has a U-shaped structure, which includes an auxiliary armature bottom and auxiliary armature arms. The two auxiliary armature arms are opposite and are respectively bent and connected to both ends of the auxiliary armature bottom. The free ends of the two auxiliary armature arms are respectively engaged with the auxiliary yoke 510. The free ends of the auxiliary armature arms pass through the wall of the corresponding bearing part installation bin 3100c to cooperate with the auxiliary yoke 520. Preferably, the auxiliary armature arms pass through the installation bin opening 31002 of the corresponding bearing part installation bin 3100c to cooperate with the auxiliary yoke 520. The auxiliary yoke 510 has a U-shaped structure, which includes an auxiliary yoke bottom and auxiliary yoke arms. The two auxiliary yoke arms are opposite and are respectively bent and connected to both ends of the auxiliary yoke bottom. The auxiliary conductor (served by the corresponding static contact 4220) passes through the middle of the auxiliary yoke 510, is opposite to the auxiliary yoke bottom and is located between the two auxiliary yoke arms. The free ends of the two auxiliary armature arms of the auxiliary armature 520 are respectively engaged with the free ends of the two auxiliary yoke arms of the auxiliary yoke 510. The two auxiliary yoke arms of the auxiliary yoke 510 are respectively clamped in the two yoke card slots 42203 of the corresponding static contact 4220.

[0127] Further, the auxiliary reset member 530 is preferably an auxiliary reset spring. The auxiliary reset spring is located between the auxiliary armature bottom of the auxiliary armature 520 and the bottom wall of the bearing part installation bin 3100c, and both ends of the auxiliary reset spring are respectively engaged with the corresponding auxiliary armature bottom and the bearing part installation bin 3100c.

[0128] Further, the trigger member 540 is linearly movable or rotatably disposed. In this embodiment, it is preferably linearly movable, which saves more space. Further, the trigger member 540 is driven by the auxiliary armature arm of the auxiliary armature 520 to move. Specifically, the trigger member 540 is linearly movable along the height direction of the circuit breaker, and is driven by the auxiliary armature arm of the auxiliary armature 520 to move.

[0129] Specifically, the trigger member 540 includes a trigger member substrate 5401, a trigger member body 540b, and a trigger boss 5403. One end of the trigger member body 540b is connected to one side of the trigger member substrate 5401. The trigger boss 5403 is disposed on the side of the trigger member body 540b facing the auxiliary switch 560. At least one end of the trigger member substrate 5401 serves as a trigger member actuating portion 5404 and extends between an auxiliary armature arm of the auxiliary armature 520 and the auxiliary yoke 510, and is in transmission cooperation with the auxiliary armature arm. Further, when two or more sets of the quick-acting mechanisms 500 are arranged side by side along the direction of the two auxiliary yoke arms of the auxiliary yoke 510 (i.e., the width direction of the circuit breaker), the adjacent two sets of quick-acting mechanisms 500 share the trigger member 540 and the auxiliary switch 560, and the trigger member 540 and the auxiliary switch 560 are located between the adjacent two electromagnetic structures 510-520. Both ends of the trigger member substrate 5401 are trigger member actuating portions 5404 and cooperate with the auxiliary yokes 520 of the two quick-acting mechanisms 500 arranged side by side. Further, the trigger member body 540b includes a trigger member top plate 5400 and trigger member side plates 5402. The trigger member top plate 5402 is opposite to the trigger member substrate 5401. The two trigger member side plates 5402 are opposite to each other. One end is bent and connected to the trigger member top plate 5400 and the other end is respectively bent and connected to the trigger member substrate 5401. The trigger member top plate 5400, the trigger member substrate 5401, and the trigger member side plates 5402 form an overall square structure. Preferably, both ends of the trigger member side plates 5402 protrude on both sides of the two trigger member side plates 5402 as two trigger member actuating portions 5404. The trigger boss 5403 is disposed on the outer side of one trigger member side plate 5402 (i.e., the side of the trigger member side plate 5402 away from the other trigger member side plate 5402). Further, the auxiliary member reset member 550 is a trigger member reset spring. The trigger member reset spring is placed in the middle of the trigger member body 540b, one end is in cooperation with the trigger member top plate 5400, and the other end is in cooperation with the spring limiting platform of the corresponding bearing portion installation bin 3100c. Further, the auxiliary armature arm of the auxiliary armature 520 is provided with an avoidance notch for avoiding the trigger member actuating portion 5404. The trigger member actuating arm 5404 is located in the avoidance notch, so that the auxiliary armature arm of the auxiliary armature 50 can contact the auxiliary yoke 510, enabling the two to be reliably closed.

[0130] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0131] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A circuit breaker comprising a housing (110), an operating device (o) and at least one set of switch devices (d); Features: In a projection perpendicular to the width direction of the circuit breaker, the housing (110) comprises an upper region (s1) and a lower region (s2) arranged side by side along the height direction of the circuit breaker, and the lower region (s2) comprises a contact region (s20) and an arc extinguishing region (s21) arranged side by side along the length direction of the circuit breaker; The operating device (o) comprises an electromagnetic system (200) arranged in an upper area (s1) and a transmission frame (310) extending from the upper area (s1) to the lower area (s2); each group of the switch devices (d) comprises a contact unit (c) and a zero arcing mechanism (430) respectively arranged in a contact area (s20) and an arc extinguishing area (s21); the contact unit (c) comprises a contact mechanism (420) and an arc extinguishing chamber (410) for use in combination, and the contact mechanism (420) comprises a moving contact assembly (421) and a stationary contact group (422) for use in combination; the electromagnetic system (200) is transmission-connected to the moving contact assembly (421) through the transmission frame (310), thereby driving the moving contact assembly (421) to move; and the exhaust port of the arc extinguishing chamber (410) is connected to the outside through the zero arcing mechanism (430).

2. The circuit breaker according to claim 1, Features: The circuit breaker comprises two or more groups of switch devices (d), and each switch device (d) is arranged side by side along the width direction of the circuit breaker.

3. The circuit breaker according to claim 1 or 2, Features: In the housing (110), the two arc extinguishing areas (s21) are respectively located on both sides of the contact area (s20) in the length direction of the circuit breaker; in the switch device (d), the static contact group (422) includes two groups of static contacts (4220) arranged side by side along the length direction of the circuit breaker, the two ends of the moving contact (4211) of the moving contact assembly (421) are respectively closed and opened synchronously with the two groups of static contacts (4220), the two groups of arc extinguishing chambers (410) are respectively located on both sides of the contact mechanism (420) in the length direction of the circuit breaker, and the two groups of zero arcing mechanisms (430) are respectively matched with the two groups of arc extinguishing chambers (410), and are respectively located on both sides of the contact unit (c) in the length direction of the circuit breaker and are respectively arranged in the two arc extinguishing areas (s21).

4. The circuit breaker according to claim 1, Features: The static contact group (422) and the moving contact assembly (421) of the electromagnetic system (200) are sequentially arranged side by side along the height direction of the circuit breaker.

5. The circuit breaker according to claim 1, Features: The electromagnetic system (200) comprises an electromagnetic coil (210), a main magnetic yoke (220) and a main armature (230); the electromagnetic coil (210) is sleeved on the main magnetic yoke (220) to form a coil assembly fixedly arranged in an upper area (s1); the main armature (230) is fixedly connected to a transmission frame (310) and moves synchronously; the main armature (230) cooperates with the main magnetic yoke (220); and the coil assembly, the main armature (230) and the transmission frame (310) are arranged in sequence along the height direction of the circuit breaker.

6. The circuit breaker according to claim 1, Features: The transmission frame (310) comprises a transmission frame linkage part (3101) transmission-connected to the moving contact assembly (421); the transmission frame linkage part (3101) and the switch device (d) are arranged side by side along the width direction of the circuit breaker.

7. The circuit breaker according to claim 6, Features: The circuit breaker comprises two or more groups of switch devices (d) arranged side by side along the width direction of the circuit breaker, the transmission frame (310) comprises at least one transmission frame linkage part (3101), and a transmission frame linkage part (3101) is provided between each two adjacent groups of switch devices (d).

8. The circuit breaker according to claim 5, Features: The circuit breaker further comprises at least one group of quick-acting mechanisms (500), the quick-acting mechanisms (500) being arranged side by side with the main armature (230) in the length direction of the circuit breaker, and each group of switch devices (d) being used in conjunction with at least one group of quick-acting mechanisms (500); the quick-acting mechanisms (500) are used to cut off the power supply to the electromagnetic coil (210) of the electromagnetic system (200) when a short-circuit fault occurs in the circuit where the corresponding switch device (d) is located.

9. The circuit breaker according to claim 8, Features: The electromagnetic system (200), the static contact group (422) and the moving contact assembly (421) are sequentially arranged side by side along the height direction of the circuit breaker; The snap-action mechanism (500) comprises an auxiliary switch (560), an auxiliary magnetic yoke (510), an auxiliary armature (520) and an auxiliary reset member (530); the auxiliary magnetic yoke (510) is arranged on a static contact group (422) of a corresponding switch device (d); the auxiliary switch (560), the auxiliary armature (520) and the auxiliary reset member (530) are all arranged on a transmission frame (310); the auxiliary reset member (530) acts on the auxiliary armature (520) to make it have a movement tendency to separate from the auxiliary magnetic yoke (510); the auxiliary armature (520) and the auxiliary magnetic yoke (510) are arranged side by side along the height direction of the circuit breaker; when a short circuit fault occurs in the circuit where the switch device (d) is located, the auxiliary magnetic yoke (510) of the corresponding snap-action mechanism (500) attracts the auxiliary armature (520) to make it move, and the auxiliary armature (520) triggers the auxiliary switch (560) to switch the state, so that the power supply of the electromagnetic coil (210) is cut off.

10. The circuit breaker according to claim 9, Features: The drive frame (310) further includes a drive frame bearing portion (3100) that is located between the coil assembly and the switching device (d) in the height direction of the circuit breaker. The main armature (230) is disposed on the drive frame bearing portion (3100) and fixedly connected thereto. The auxiliary armature (520), the auxiliary reset member (530), and the auxiliary switch (560) of the quick-acting mechanism (500) are all disposed on the drive frame bearing portion (3100). The drive frame bearing portion (3100) is provided with a bearing portion installation bin (3100c) that is arranged in one-to-one correspondence and cooperation with the quick-acting mechanism (500). The auxiliary armature (520) and the auxiliary reset member (530) are both disposed in the bearing portion installation bin (3100c), and the auxiliary switch (560) is disposed outside the bearing portion installation bin (3100c). The circuit breaker includes two or more groups of switching devices (d). The switching devices (d) are arranged in one-to-one correspondence and cooperation with the quick-acting mechanisms (500). Each quick-acting mechanism (500) is arranged side by side in the width direction of the circuit breaker. Two adjacent quick-acting mechanisms (500) share an auxiliary switch (560), and the auxiliary switch (560) is located between two bearing portion installation bins (3100c) that are respectively in cooperation with the two adjacent quick-acting mechanisms (500). In the switching device (d), the static contact group (422) includes two groups of static contacts (4220) arranged side by side in the length direction of the circuit breaker. The static contacts (4220) are arranged in one-to-one correspondence and cooperation with the quick-acting mechanisms (500). The two quick-acting mechanisms (500) that are in cooperation with the same static contact group (422) are respectively arranged on both sides of the main armature (230). In the length direction of the circuit breaker, among the multiple quick-acting mechanisms (500) located on the same side of the main armature (230), two adjacent quick-acting mechanisms (500) share an auxiliary switch (560), and the auxiliary switch (560) is located between two bearing portion installation bins (3100c) that are respectively in cooperation with the two adjacent quick-acting mechanisms (500). The electromagnetic system (200) further includes a main reset member (320). The main reset member (320) is a main reset spring. Four main reset springs are distributed at the four vertices of a rectangle and surround the coil assembly of the electromagnetic system (200). Both ends of each main reset spring are respectively in cooperation with the housing (110) and the drive frame (310). Each group of the contact units (c) includes a unit housing (400) and a contact mechanism (420) and an arc extinguishing chamber (410) disposed in the unit housing (400). In each group of switching devices (d), the zero-flyover arc mechanism (430) is disposed outside the contact unit (c), and the zero-flyover arc mechanism (430) and the contact unit (c) are arranged side by side in the length direction of the circuit breaker. The housing (110) includes an upper housing, a middle housing, and a lower housing that are sequentially joined together along the height direction of the circuit breaker. An upper region (s1) is formed between the upper housing and the middle housing, and a lower region (s2) is formed between the middle housing and the lower housing. When the circuit breaker includes at least two sets of switching devices (d) arranged side by side along the width direction of the circuit breaker, a partition structure for separating adjacent switching devices (d) is provided in the lower region (s2).

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