High breaking circuit breaker

Abstract

A high breaking circuit breaker comprises a shell, an arc extinguish chamber, a static contact, a moving contact and gas production hoods located on the two sides of the moving contact, and a pair of partition plates are arranged between a contact opening and closing area and an arc extinguish area and located in front of the gas outlet sides of the gas production hoods and the gas inlet ends of arc extinguish grid pieces; a plurality of gaps distributed at intervals are formed in each partition plate, and the gaps are used for forming alternate isolation areas and conduction areas on the partition plates, so that gas generated by the gas generation cover and rushing into the arc extinguish chamber is blocked by the isolation areas and redistributed, and then the gas is discharged into the arc extinguish chamber. And the corresponding gaps between the arc extinguishing grid sheets are directionally guided through the conduction regions. By arranging the partition plate with the notch, 'blocking and dredging 'of high-pressure gas is creatively achieved. The partition plates block disordered impact (blocking) of gas on the front faces of the grid pieces, and the gas is forced to be gathered. The gaps provide an ordered discharge channel ('dredging '), airflow is accurately guided into gaps of the target grid pieces, and inlet blockage is fundamentally eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a high breaking capacity circuit breaker. BACKGROUND

[0002] A high breaking capacity circuit breaker is a key protection device in low-voltage power distribution systems, and one of its core performance indicators is the ability to quickly and reliably break short-circuit fault currents. To achieve this goal, modern circuit breakers generally use a combination of gas blowout arc extinguishing and grid segmentation.

[0003] A typical such circuit breaker has a housing with adjacent contact separation and arc extinguishing zones inside. In the contact separation zone, the moving and stationary contacts generate an arc when the circuit breaker is opened. To accelerate the arc into the arc extinguishing zone and generate gas that helps extinguish the arc, a gas generating cover made of gas generating material is usually provided near the contact separation area, and sometimes a magnetic enhancement sheet is also provided inside the gas generating cover to provide magnetic blowout force. In the arc extinguishing zone, there is an arc extinguishing chamber made up of multiple parallel metal grid plates stacked together. The working principle is as follows: when the circuit breaker is opened, the arc is driven into the arc extinguishing zone under the action of magnetic blowout force, and the gas generating material is rapidly decomposed by the high temperature of the arc to generate a large amount of high pressure gas; the gas and the arc interact with each other and blow the arc towards the arc extinguishing grid plates; the grid plates divide the arc into multiple series short arcs, and use the cooling effect of the metal surface to cause the arc voltage to rise and quickly extinguish when the current crosses zero.

[0004] However, in the prior art, the gas outlet of the gas generating cover is usually directly and unobstructed towards the inlet end of the arc extinguishing grid plates. This layout causes the high pressure and high temperature gas flow generated at the moment of opening to almost unorganized and in the form of turbulent flow directly impact on the front end face of the densely arranged arc extinguishing grid plates. A large amount of gas collides and blocks each other at the narrow entrance of the grid plate array, forming a local "gas block" phenomenon, rather than smoothly and uniformly flowing into the narrow gap channel between each grid plate. This disordered gas flow state brings the following significant disadvantages: first, the longitudinal blowing and cooling effect of the gas on the arc is weakened, the arc is lengthened and the speed of entering the deep part of the grid plate is reduced; second, the gas energy cannot be effectively converted into kinetic energy to push the arc movement, part of the energy is dissipated in the form of heat and pressure, which may cause the internal gas pressure to abnormally rise; finally, the overall arc extinguishing efficiency is limited, the arc burning time may be prolonged, which limits the further improvement of the breaking capacity of the circuit breaker, and there is a risk of arc reignition or arc spray when breaking the limit current. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a high breaking capacity circuit breaker.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A high breaking circuit breaker comprises a housing, an arc extinguishing area and a contact opening and closing area are arranged in the housing, an arc extinguishing chamber composed of arc extinguishing vanes is arranged in the arc extinguishing area, a static contact, a movable contact and gas generating covers arranged on both sides of the movable contact are arranged in the contact opening and closing area, a contact opening and closing slit for the movable contact is formed between the two gas generating covers, A pair of baffles are arranged between the contact opening and closing area and the arc extinguishing area and before the gas outlet side of the gas generating cover and the gas inlet end of the arc extinguishing vane, and a gap corresponding to the contact opening and closing slit is formed between the two baffles; A plurality of gaps are arranged on each baffle in a spaced manner, each gap is used to form alternating isolation areas and conduction areas on the baffle, so that the gas generated by the gas generating cover and rushing to the arc extinguishing chamber is blocked and redistributed by the isolation areas, and then is directed into the corresponding gap between the arc extinguishing vanes through the conduction areas.

[0007] The gaps divide the baffle into isolation segments and conduction segments, and the length of the isolation segments is greater than the length of the conduction segments.

[0008] The projection of the conduction segment in the direction perpendicular to the gas flow direction is matched with the gap inlet between the arc extinguishing vanes.

[0009] A plurality of groups of the conduction areas are arranged on each baffle, and each group is distributed along the height direction of the housing, so that the gas generated by the gas generating cover is guided and uniformly distributed to different segments of the arc extinguishing vanes in the height direction.

[0010] The front surface of the gas generating cover forms a plurality of arc generating grooves, and the back surface of the gas generating cover is provided with a cavity for accommodating a magnetic enhancement sheet.

[0011] The movable contact is installed in the housing through an operating mechanism, the operating mechanism is coaxially arranged with the rotation axis of the movable contact, and the operating mechanism comprises: A contact support rotatably arranged in the housing; A lock catch rotatably arranged on the contact support, and an installation space for accommodating the movable contact is formed between the contact support and the lock catch, An end of the lock catch extends into a support end groove arranged at the upper end of the contact support to form an opening and closing hole.

[0012] A first torsional spring is arranged on the lock catch, and the two ends of the first torsional spring abut against the lock catch and the contact support respectively, the contact support is provided with a second torsional spring, one end of the second torsional spring abuts against the contact support, and the other end of the second torsional spring is bent and connected with the movable contact, and the housing is provided with a third torsional spring, one end of the third torsional spring abuts against the housing, and the other end of the third torsional spring abuts against the contact support.

[0013] The contact support is provided with an L-shaped limiting boss, the movable contact is provided with a protrusion at one end, the protrusion is matched with the limiting boss to form limiting in the direction perpendicular to the rotation axis of the movable contact, and one side of the limiting boss is provided with a boss for limiting the rotation angle of the movable contact.

[0014] The electromagnetic tripping mechanism is further arranged in the shell, the electromagnetic tripping mechanism comprises a coil former and a flat coil wound on the coil former, one end of the flat coil is electrically connected with a terminal plate, and the electrical connection position of the terminal plate and the flat coil is located on one side of the coil former in the thickness direction of the shell.

[0015] The hot double gold sheet is arranged in the shell, two parallel circuits are arranged between the movable contact and the terminal plate, the movable contact is connected with the terminal plate through the hot double gold sheet to form a first circuit, and the movable contact is directly connected with the terminal plate to form a second circuit.

[0016] The beneficial effects of the present application are: by arranging the partition plate with notches, the high-pressure gas is creatively blocked and released. The partition plate itself blocks the disordered impact of the gas on the front surface of the grid piece (blocking), and forces the gas to converge; the notches provide an orderly release channel (release), and accurately guide the gas flow into the target grid piece gap, which fundamentally eliminates the inlet blockage. The guided gas flow has higher speed and more concentrated direction, and can more effectively blow and cool the arc, quickly pushing it into the deep part of the arc-extinguishing grid piece. This greatly shortens the arc burning time, increases the arc voltage, and thus significantly improves the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a vertical cross-sectional view of the present application.

[0018] Figure 2 It is a horizontal cross-sectional view of the present application.

[0019] Figure 3 It is a schematic view of the internal structure of the present application.

[0020] Figure 4 It is a schematic view of the structure of the shell of the present application.

[0021] Figure 5 It is a schematic view of the structure of the gas production cover of the present application.

[0022] Figure 6 It is Figure 5 It is a cross-sectional view at A-A.

[0023] Figure 7 It is a local enlarged schematic view of the operating mechanism.

[0024] Figure 8Fig. 6 is a partial enlarged view of another angle of the operating mechanism.

[0025] Figure 9 Fig. 7 is a front view of the operating mechanism.

[0026] Figure 10 Fig. 8 is a view of the cooperation between the contact support and the movable contact.

[0027] Figure 11 Fig. 9 is a view of the cooperation between the lock catch and the contact support. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0030] As shown in Figure 1 , three directions of the shell are defined: the left-right direction parallel to the paper surface is the length direction of the shell, the direction perpendicular to the paper surface is the thickness direction of the shell, and the up-down direction is the height direction of the shell.

[0031] As shown in Figure 1 and Figure 2 , the present application discloses a high breaking circuit breaker, which comprises a shell 100, both sides of the length direction of the shell 100 are provided with wiring terminals 700, each of which is provided with a wiring board 710, the wiring board at one end is electrically connected with an electromagnetic tripping assembly, and the wiring board at the other end needs to be connected with a movable contact, the shell 100 is provided with adjacent arc extinguishing zones 110 and contact opening and closing zones 120 inside, the arc extinguishing zone 110 is provided with an arc extinguishing chamber 200 composed of a plurality of arc extinguishing grid pieces, the contact opening and closing zone 120 is provided with a stationary contact, a movable contact 500 and gas generating covers 300 located on both sides of the movable contact 500, and a split and closing slit 310 for the movement of the movable contact 500 is formed between the two gas generating covers 300.

[0032] The arc extinguishing chamber is composed of a plurality of U-shaped metal arc extinguishing grid pieces stacked together. The gas generating cover is made of a gas generating material (such as polyamide), as shown in Figure 5 and Figure 6As shown, the inner side (front side) of the gas production cover is provided with a plurality of longitudinal arc guiding grooves 320, and the back side (rear side) is provided with a cavity 330, which is embedded with a steel magnetic sheet 800 for generating magnetic blowing force to drive the arc. The back side of the gas production cover forms a surrounding wall in the circumferential direction, the circumferential direction of the magnetic sheet is surrounded, and a plurality of positioning columns are arranged in the cavity, which are used for positioning the magnetic sheet and form positioning cooperation with the inner wall of the shell, facilitating the fixation and installation of the gas production cover.

[0033] Between the contact switching area 120 and the arc extinguishing area 110, and before the gas outlet side of the gas production cover 300 and the gas inlet end of the arc extinguishing grid, a pair of baffles 130 is arranged, and a gap 140 corresponding to the switching slit 310 is formed between the two baffles 130. The baffle 130 is arranged at the physical junction of the contact switching area 120 and the arc extinguishing area 110, and the baffle is adjacent to the gas outlet of the gas production cover and the front end of the inlet of the arc extinguishing grid, and the height of the baffle is matched with the thickness of the gas production cover. The gap 140 formed by the two baffles corresponds to the switching slit 310 and is used for the arc to pass through.

[0034] As shown in Figure 3 and Figure 4 Each of the baffles 130 is provided with a plurality of spaced-apart notches 150, and each notch 150 is used to form alternating isolation areas and conductive areas on the baffle 130, so that the gas generated by the gas production cover 300 and directed to the arc extinguishing chamber 200 is blocked and redistributed by the isolation areas, and then directed into the corresponding gap between the arc extinguishing grids through the conductive areas.

[0035] That is, three notches are arranged on each baffle in the height direction of the shell. These notches divide the main body of the baffle into two longer isolation sections 142 and three shorter conductive sections 141. As shown in Figure 4 In the gas flow direction, the length of the isolation section 142 is significantly greater than the length of the conductive section 141. Each of the baffles 130 is provided with a plurality of groups of conductive areas, and each group is distributed in the height direction of the shell 100, so that the gas generated by the gas production cover 300 is guided and uniformly distributed to different sections of the arc extinguishing grids in the height direction. In this embodiment, only three conductive sections 141 are formed at the upper, middle and lower positions to form a communication, and the isolation section plays a major blocking role; while the conductive section is accurately aligned with the gap entrance between the arc extinguishing grids. That is, the projection of the conductive section 141 in the direction perpendicular to the gas flow direction is matched with the gap entrance between the arc extinguishing grids.

[0036] Meanwhile, a plurality of support blocks are arranged near the baffles of the shell, the gas production cover is arranged on the support blocks, and a gap is formed between the gas production cover and the shell. The direction of each support block towards the gas production cover is designed as a circular arc, and the support block enhances the strength of the baffle to avoid breakage caused by gas flow impact.

[0037] When the circuit breaker is opened, an arc is generated between the moving and static contacts, and under the action of the magnetic field generated by the magnetic shims, the arc is elongated and moves towards the arc extinguishing chamber. At the same time, the high temperature of the arc causes a large amount of high-pressure gas to be generated in the gas generation cover. These gases first rush to the baffle, and due to the blocking of the isolation section of the baffle, the gases cannot directly impact the front end face of the arc extinguishing grid, but are blocked and gathered between the baffle and the gas generation cover. As the pressure rises, the gases enter the arc extinguishing chamber from the gap in the baffle. Due to the fact that the total flow area of the through section is smaller than the outlet area of the gas generation cover, the gases are accelerated to form a high-speed jet, and after passing through the through section, the gases are precisely guided into the gap of the corresponding arc extinguishing grid. By using the blocking and sparse mode, the guided gas flow is highly coordinated with the arc movement path under the action of magnetic blowing, and the arc is quickly "blown" into the deep part of the arc extinguishing grid, and is efficiently divided and cooled by the grid, so as to be quickly extinguished when the current is zero. The circuit breaker adopting the structure can shorten the arc time by about 20% during breaking, and the limit breaking capacity is significantly improved, which can meet the breaking requirements of high breaking circuit breakers.

[0038] The baffle is integrally formed on the shell and has excellent synergistic effect with the existing components such as the gas generation cover, the magnetic shims and the arc guiding groove, and together forms a high-efficiency composite arc extinguishing system, which greatly improves the product performance without significantly increasing the cost.

[0039] As shown in Figure 7 , Figure 8 and Figure 9 , the moving contact 500 is driven and supported by the operating mechanism 600. The core of the operating mechanism is its coaxial integrated design. Specifically, the operating mechanism includes a contact support 610 rotatably mounted on the shell through a main shaft 690, and a lock catch 620 rotatably sleeved on the contact support 610 through the same main shaft, and a mounting space 650 accommodating the moving contact 500 is formed between the contact support 610 and the lock catch 620. The moving contact is mounted in the mounting space and rotatably sleeved on the outside of the same main shaft.

[0040] As shown in Figure 11 , the upper end of the contact support 610 is provided with a support end slot 614, and one end of the lock catch 620 extends into the support end slot to form an opening and closing hole 615. A handle 630 is also rotatably arranged in the shell, and the handle is linked with a U-shaped pull rod 640. The other end of the U-shaped pull rod is placed in the opening and closing hole 615, and the upper end of the lock catch forms an abutting portion 621 that cooperates with the support end slot to form the opening and closing hole. When the handle is opened, the locking force of the opening and closing hole pushes the contact support to rotate, thereby achieving closing. When the operating mechanism is opened, the handle pushes the pull rod to slide out of the opening and closing hole and into the support end slot, thereby releasing the limit.

[0041] The lock catch 620 is provided with a first torsion spring 660, and the two ends of the first torsion spring 660 abut against the lock catch 620 and the contact support 610 respectively, so that the lock catch has a tendency to rotate in a certain direction relative to the contact support.

[0042] The contact support 610 is provided with a second torsion spring 670, one end of the second torsion spring 670 abuts against the contact support 610, and the other end is bent and inserted or clamped in a pre-designed clamping groove on the side of the movable contact. Therefore, the second torsion spring exerts a force on the movable contact, affecting the closing pressure of the movable contact.

[0043] The shell 100 is provided with a third torsion spring 680, one end of the third torsion spring 680 abuts against the shell 100, and the other end abuts against the contact support 610, providing a main restoring torque of the contact support relative to the shell.

[0044] Meanwhile, the third torsion spring is independently installed, so that the lock catch, the contact support and the movable contact form an independent module, facilitating subsequent automatic production.

[0045] The top of the contact support is designed as an indicating end 611, which has two indicating segments of different colors, and a window is correspondingly provided on the shell, so that the current state can be directly known through the different colors in the window during the opening and closing actions of the contact support.

[0046] As shown in Figure 10 The contact support 610 is provided with an L-shaped limiting boss 612, and the movable contact 500 is provided with a protrusion 510 at one end, and the protrusion 510 cooperates with the limiting boss 612 to form a limiting position in a direction perpendicular to the rotation axis of the movable contact, and one side of the limiting boss 612 is provided with a boss 613 for limiting the rotation angle of the movable contact.

[0047] In the assembled state, the protrusion of the movable contact is embedded in the right-angle area of the L-shaped limiting boss of the contact support. When the movable contact is subjected to a force perpendicular to the rotation axis direction (i.e. radial direction), the side surface of the protrusion will be in contact with the corresponding inner side surface of the L-shaped limiting boss, thereby preventing the movement or shaking of the movable contact in the direction, realizing radial limiting and greatly enhancing the mechanical stability of the movable contact system under the short-circuit large-current electric repulsive force. During the entire opening and closing process, the L-shaped limiting boss always provides radial constraint to the movable contact through the protrusion, ensuring the stability of the movement track and preventing the deflection.

[0048] On one side of the horizontal edge of the L-shaped limiting boss, a boss for angle limiting is further provided. When the movable contact rotates around the shaft (opening or closing action), the protrusion or the movable contact body will finally abut against the boss, so as to be limited within the pre-designed maximum rotation angle, preventing over-rotation.

[0049] The shell 100 is also provided with an electromagnetic tripping mechanism 400, which comprises a coil former on which an electromagnetic coil for generating a tripping magnetic field is wound. In order to meet the high breaking requirement, the electromagnetic coil adopts a flat coil, and in the embodiment, the position of the electrical connection point of the flat coil and the terminal plate is improved, which is not located below the coil former (i.e. the lower side of the height direction 8) or on one side of the length direction, but is explicitly arranged on one side of the thickness direction of the coil former.

[0050] The terminal plate can be designed to have a bending or extending part, so that the main body part thereof can be located on the width side or below the coil former to match the main circuit, but the welding tab connected with the coil extends to the side of the thickness direction of the coil former, so as to complete welding. The inside of the shell can be provided with a guide groove or a supporting column at the corresponding position for fixing and positioning the terminal plate.

[0051] Since the thickness direction is usually the thinner direction of the shell, the space on this side is often regarded as a "corner" space in the traditional design. The present application creatively uses this "corner" space to arrange the important current connection point, so that the space directly below the coil former (in the height direction) is released, which can be used to arrange a more spacious arc-extinguishing chamber entrance or to strengthen the core structure. At the same time, the side welding provides an unobstructed operation path for the automatic welding equipment, improving the production efficiency and the quality of the welding points.

[0052] The shell is provided with a thermal bimetallic strip 900, and two parallel circuits are arranged between the moving contact 500 and the terminal plate. The moving contact is connected with the terminal plate through the thermal bimetallic strip 900 to form a first circuit 920, and the moving contact 500 is directly connected with the terminal plate to form a second circuit 910.

[0053] The first circuit: one end of the moving contact is electrically connected with one end of the thermal bimetallic strip, and the other end of the thermal bimetallic strip is connected with the terminal plate. The deformed part of the thermal bimetallic strip is associated with the tripping mechanism.

[0054] The second circuit: a separate low-impedance conductor (such as a copper connecting piece or a flexible wire bundle) is directly connected between one end of the moving contact (or a common connection point with the first circuit on the moving contact side) and the terminal plate.

[0055] In the embodiment, both circuits are realized by wires to connect the parts.

[0056] Through the design of the double circuits, the temperature rise of the moving contact is greatly reduced, so that it can realize the breaking of a larger current.

[0057] The embodiments should not be regarded as a limitation of the present application, but any improvement based on the spirit of the present application should be within the protection scope of the present application.

Claims

1. A high breaking capacity circuit breaker, comprising a housing (100), wherein adjacent arc-extinguishing zones (110) and contact opening / closing zones (120) are provided within the housing (100), an arc-extinguishing chamber (200) composed of a plurality of arc-extinguishing grid plates is provided within the arc-extinguishing zone (110), and a stationary contact, a moving contact (500) and gas-generating hoods (300) located on both sides of the moving contact (500) are provided within the contact opening / closing zone (120), wherein a slit (310) for the moving contact (500) to move is formed between the two gas-generating hoods (300), characterized in that: Between the contact separation area (120) and the arc extinguishing area (110), and in front of the air outlet side of the gas generating hood (300) and the air inlet end of the arc extinguishing grid, a pair of partitions (130) are provided, and a gap (140) corresponding to the separation slit (310) is formed between the two partitions (130). Each of the partitions (130) is provided with a plurality of spaced notches (150), each notch (150) is used to form alternating isolation areas and conduction areas on the partition (130), such that the gas generated by the gas generating hood (300) and rushing toward the arc extinguishing chamber (200) is blocked and redistributed by the isolation areas, and then directed into the corresponding gaps between the arc extinguishing grids via the conduction areas.

2. A high breaking capacity circuit breaker according to claim 1, characterized in that: The notch (150) divides the partition (130) into an isolation section (142) and a conduction section (141), wherein the length of the isolation section (142) is greater than the length of the conduction section (141).

3. A high breaking capacity circuit breaker according to claim 2, characterized in that: The projection of the conducting section (141) perpendicular to the gas flow direction is adapted to the gap inlet between the arc-extinguishing grid plates.

4. A high breaking capacity circuit breaker according to any one of claims 1 to 3, characterized in that: Each of the partitions (130) is provided with multiple sets of the conductive areas, each set being distributed along the height direction of the housing (100), so that the gas generated by the gas generating hood (300) is guided and evenly distributed to different sections of the arc extinguishing grid in the height direction.

5. A high breaking capacity circuit breaker according to claim 1, characterized in that: The front side of the gas generating hood (300) has a plurality of arc-inducing grooves (320), and the back side of the gas generating hood (300) is provided with a cavity (330) for accommodating the magnetizing sheet (800).

6. A high breaking capacity circuit breaker according to claim 1, characterized in that: The moving contact (500) is mounted inside the housing (100) via an operating mechanism (600). The operating mechanism (600) is coaxially arranged with the rotation axis of the moving contact (500). The operating mechanism (600) includes: A contact bracket (610) is rotatably disposed within the housing (100). A latch (620) rotatably mounted on the contact bracket (610) forms an installation space between the two to accommodate the moving contact (500). The upper end of the contact bracket (610) is provided with a bracket end groove (614), and one end of the latch (620) extends into the bracket end groove (614) to form an opening and closing hole (615).

7. A high breaking capacity circuit breaker according to claim 6, characterized in that: The latch (620) is provided with a first torsion spring (660), the two ends of the first torsion spring (660) abut against the latch (620) and the contact bracket (610) respectively. The contact bracket (610) is provided with a second torsion spring (670), one end of the second torsion spring (670) abuts against the contact bracket (610), and the other end is bent and engaged with the moving contact (500). The housing (100) is provided with a third torsion spring (680), one end of the third torsion spring (680) abuts against the housing (100), and the other end abuts against the contact bracket (610).

8. A high breaking capacity circuit breaker according to claim 6, characterized in that: The contact support (610) is provided with an L-shaped limiting boss (612), and the moving contact (500) is provided with a protrusion (510) at one end. The protrusion (510) cooperates with the limiting boss (612) to form a limit in a direction perpendicular to the rotation axis of the moving contact. The limiting boss (612) is provided with a boss (613) on one side for limiting the rotation angle of the moving contact.

9. A high breaking capacity circuit breaker according to claim 1, characterized in that: The housing (100) is also provided with an electromagnetic tripping mechanism (400). The electromagnetic tripping mechanism (400) includes a coil frame and a flat coil wound on the coil frame. One end of the flat coil is electrically connected to a terminal block, and the electrical connection between the terminal block and the flat coil is located on one side of the coil frame in the thickness direction of the housing.

10. A high breaking capacity circuit breaker according to claim 1, characterized in that: The housing is provided with a thermal double metal sheet (900), and there are two parallel circuits between the moving contact (500) and the terminal block. The moving contact is connected to the terminal block via the thermal double metal sheet (900) to form a first circuit (920), and the moving contact (500) is directly connected to the terminal block to form a second circuit (910).

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