Circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker. The circuit breaker comprises a shell, a rotating shaft and a moving contact, the rotating shaft is rotationally arranged in the shell, and the moving contact is rotationally installed on the rotating shaft. The circuit breaker further comprises a quick-acting mechanism and a traction rod, the quick-acting mechanism comprises a supporting frame, a triggering piece and a first reset piece, the supporting frame is installed in the shell, the triggering piece comprises a triggering part and a quick-acting part which are in transmission connection, and the triggering part is movably installed on the supporting frame and has an initial position where the triggering part is disengaged from the traction rod and a tripping position where the traction rod is pushed to be tripped. The first reset piece is installed between the supporting frame and the triggering part. When the circuit breaker is abnormally repelled, the moving contact abuts against the quick-acting part so as to drive the trigger part to move to a tripping position through the quick-acting part. When the circuit breaker works normally, the moving contact is separated from the quick-acting part, and the trigger part returns to the initial position under the action of the first reset piece. And the moving contact is linked with the draw bar, so that the draw bar can be quickly tripped, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more particularly to a circuit breaker. Background Technology

[0002] In existing circuit breakers, the tripping mechanism mostly uses electromagnetic force to strike the traction rod to complete the breaking task. When the circuit breaker is performing normal breaking or encountering a large fault current, the moving contact of the moving contact is repelled by the electromagnetic repulsion force, and the rotating shaft is fixed and cannot move due to the pressure of the operating mechanism in the circuit breaker. The electromagnetic system is slow to act, and the tripping mechanism is delayed in starting, which makes the circuit breaker have the problems of long tripping action time and low breaking capacity. Summary of the Invention

[0003] The purpose of this invention is to provide a circuit breaker that enables rapid tripping and improves the breaking capacity of the circuit breaker.

[0004] To achieve this objective, the technical solution adopted by the present invention is as follows: A circuit breaker includes a housing, a rotating shaft, and a moving contact, wherein the rotating shaft is rotatably disposed within the housing, and the moving contact is rotatably mounted on the rotating shaft; The circuit breaker further includes a quick-acting mechanism and a traction rod. The quick-acting mechanism includes a trigger and a first reset. The trigger includes a trigger part and a quick-acting part that are connected by transmission. The trigger part is movably installed in the housing and has an initial position that disengages from the traction rod and a release position that pushes the traction rod to release. When the circuit breaker is abnormally opened, the moving contact presses against the quick-acting part, so that the quick-acting part drives the trigger part to move to the tripping position; when the circuit breaker is closed, the moving contact disengages from the quick-acting part, and the trigger part returns to the initial position under the action of the first reset member.

[0005] As an optional solution, the quick-action mechanism further includes a support frame, and the quick-action part includes a pressure-bearing member and a first shaft, wherein the pressure-bearing member is pivotally mounted to the support frame via the first shaft; The trigger part is provided with a receiving groove, and part of the pressure-bearing member extends into the receiving groove; when the circuit breaker is abnormally opened, the moving contact presses against the pressure-bearing member and causes the pressure-bearing member to press against the inner wall of the receiving groove, thereby driving the trigger part to move to the tripping position.

[0006] As an optional solution, the pressure-bearing component includes: When the circuit breaker is abnormally opened, the moving contact presses against the pressure plate; Two arm plates are respectively disposed on opposite sides of the pressure plate to make the pressure-bearing component U-shaped; both arm plates are pivotally mounted to the support frame via the first shaft; the trigger part is provided with two receiving grooves, and the ends of the two arm plates away from the pressure plate extend into the corresponding receiving grooves respectively.

[0007] As an optional solution, the end of the arm plate that extends into the receiving groove is provided with a flange.

[0008] As an optional solution, the quick-action mechanism is an electromagnetic release mechanism, which further includes a second shaft, the support frame is an armature bracket, the triggering part is an armature, and the armature is pivotally mounted to the armature bracket via the second shaft.

[0009] As an optional solution, the triggering part and the fast-acting part are connected as one piece, so that the triggering element is a one-piece molded part.

[0010] As an optional feature, the circuit breaker further includes an arc-blocking element, which comprises: A sleeve plate is disposed on the side of the moving contact near the moving contact point; A protective plate, one end of which is connected to the sleeve plate, is arranged circumferentially along the rotating shaft.

[0011] As an optional embodiment, the sleeve includes a base plate and two clamping plates, the two clamping plates being respectively disposed on opposite sides of the base plate; the moving contact is clamped between the two clamping plates and attached to the base plate; At least one of the clamping plates is provided with a through hole, and the moving contact is provided with a corresponding positioning post, the positioning post passing through the corresponding through hole; and / or, the moving contact is provided with a slot, the clamping plate is provided with a protrusion, the protrusion engaging with the corresponding slot.

[0012] As an optional feature, the circuit breaker further includes a self-sustaining component, which includes: The self-holding component includes a main body plate and an inclined plate. One end of the main body plate is rotatably disposed within the rotating shaft, and the other end of the main body plate is provided with the inclined plate, which is inclined toward the moving contact of the moving contact. The moving contact is provided with a protruding post. When the circuit breaker is working normally, the protruding post abuts against the side of the main body plate away from the moving contact of the moving contact. When the moving contact is abnormally repelled, the protruding post presses against the inclined plate. The second reset component is installed between the main body plate and the moving contact.

[0013] As an optional solution, the angle between the main plate and the inclined plate is 30°-50°.

[0014] The beneficial effects of this invention are as follows: The circuit breaker proposed in this invention, when abnormally opened, has its moving contact pressing against the quick-acting part, which drives the triggering part to move to the tripping position. When the circuit breaker closes, the moving contact disengages from the quick-acting part, and the triggering part returns to its initial position under the action of the first reset member. The moving contact is linked to the traction rod through the quick-acting mechanism, so as to quickly transmit the movement of the moving contact to the traction rod, shortening the tripping action time of the circuit breaker, realizing the rapid tripping of the traction rod, and improving the breaking capacity of the circuit breaker. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit breaker provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the stationary contact support, moving contact, rotating shaft, quick-acting mechanism and traction rod of the circuit breaker during tripping, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the stationary contact support, moving contact, rotating shaft, quick-acting mechanism and traction rod of the circuit breaker during closing, provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the first quick-action mechanism provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the moving contact and the arc-blocking plate provided in an embodiment of the present invention; Figure 6 This is an exploded structural diagram of the moving contact and the arc-blocking plate provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the rotating shaft, moving contact and self-holding mechanism of the circuit breaker during normal disconnection provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the rotating shaft, moving contact, and self-holding mechanism after the moving contact is pushed back, provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of the structure of the second type of quick-action mechanism support frame and quick-action part provided in the embodiment of the present invention.

[0016] The component names and labels in the diagram are as follows: 1. Housing; 2. Rotating shaft; 3. Moving contact; 30. Moving contact point; 31. Positioning post; 32. Tail end; 33. Slot; 34. Protrusion; 35. Third shaft; 4. Quick-acting mechanism; 41. Support frame; 42. Trigger; 421. Receiving groove; 43. Quick-acting part; 431. Pressure bearing component; 4311. Pressure bearing plate; 4312. Arm plate; 43120. Flanged edge; 432. First shaft; 44. First reset component; 45. Second shaft; 46. Magnetic yoke; 5. Traction rod; 6. Arc blocking component; 61. Sleeve plate; 611. Base plate; 612. Clamping plate; 6121. Through hole; 6122. Snap protrusion; 62. Protective plate; 7. Self-holding component; 71. Main body plate; 72. Inclined plate; 8. Second reset component; 9. Stationary contact bracket. Detailed Implementation

[0017] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0018] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] In existing circuit breakers, the tripping mechanism mostly uses electromagnetic force to strike the traction rod to complete the breaking task. When the circuit breaker is performing normal breaking or encountering a large fault current, the moving contact of the moving contact is repelled by the electromagnetic repulsion force, and the rotating shaft is fixed and cannot move due to the pressure of the operating mechanism in the circuit breaker. The electromagnetic system is slow to act, and the tripping mechanism is delayed in starting, which makes the circuit breaker have the problems of long tripping action time and low breaking capacity.

[0023] To solve the above problems, such as Figures 1-3 As shown, this embodiment proposes a circuit breaker, which includes a housing 1, a rotating shaft 2, and a moving contact 3. The rotating shaft 2 is rotatably disposed within the housing 1, and the moving contact 3 is rotatably mounted on the rotating shaft 2. The circuit breaker also includes a quick-acting mechanism 4 and a traction rod 5. The quick-acting mechanism 4 includes a trigger element and a first reset element 44. The trigger element includes a trigger part 42 and a quick-acting part 43 that are connected by transmission. The trigger part 42 is movably mounted within the housing 1 and has an initial position where it is disengaged from the traction rod 5 and a tripping position where it pushes the traction rod 5 to trip. When the circuit breaker is abnormally opened, the moving contact 3 presses against the quick-acting part 43 to drive the trigger part 42 to move to the tripping position. When the circuit breaker is operating normally, the moving contact 3 is disengaged from the quick-acting part 43, and the trigger part 42 returns to its initial position under the action of the first reset element 44.

[0024] When the circuit breaker abnormally opens, the moving contact 3 presses against the quick-acting part 43, which drives the trigger part 42 to move to the tripping position. During normal operation, the moving contact 3 disengages from the quick-acting part 43, and the trigger part 42 returns to its initial position under the action of the first reset member 44. The moving contact 3 is linked to the traction rod 5 via the quick-acting mechanism 4, rapidly transmitting the movement of the moving contact 3 to the traction rod 5, shortening the circuit breaker's tripping time, enabling rapid tripping of the traction rod 5, and improving the circuit breaker's breaking capacity.

[0025] It should be noted that the aforementioned abnormal circuit breaker opening refers to the situation where, under the influence of a large current fault, the moving contact 30 of the moving contact 3 is repelled by the electric repulsive force, the rotating shaft 2 is fixed and cannot move due to the pressure of the circuit breaker's operating mechanism, and the magnetic system in the circuit breaker has not yet driven the traction rod 5 to move. The moving contact 3 then presses down, causing the trigger element to move, effectively shortening the tripping time and achieving rapid tripping. The aforementioned normal operation of the circuit breaker refers to its opening, closing, and free-tripping states.

[0026] like Figures 2-4 As shown, the quick-acting mechanism 4 also includes a support frame 41, and the quick-acting part 43 includes a pressure-bearing member 431 and a first shaft 432. The pressure-bearing member 431 is pivotally mounted to the support frame 41 via the first shaft 432. The trigger part 42 is provided with a receiving groove 421, and part of the pressure-bearing member 431 extends into the receiving groove 421. When the circuit breaker is abnormally opened, the moving contact 3 presses against the pressure-bearing member 431 and causes the pressure-bearing member 431 to press against the inner wall of the receiving groove 421, thereby driving the trigger part 42 to move to the tripping position.

[0027] Specifically, the pressure-bearing component 431 is rotatably mounted on the support frame 41 via the first shaft 432. For example... Figure 2 As shown, when the circuit breaker disconnects or encounters a large fault current, the contact system is subjected to a large current surge. The moving contact 30 in the moving contact 3 is repelled by the electric repulsive force, and the moving contact 3 rotates clockwise. Figure 2 (In the direction indicated by the middle arrow), the tail end 32 of the moving contact 3 presses against the pressure bearing 431, causing the pressure bearing 431 to rotate counterclockwise (towards...). Figure 2 (In the opposite direction of the middle arrow), the pressure member 431 presses against the inner wall of the receiving groove 421 of the trigger part 42 to push the trigger part 42 to rotate clockwise, so that the trigger part 42 strikes the traction rod 5 to achieve the disengagement action. Figure 3 As shown, when the circuit breaker is closed, the moving contact 30 of the moving contact 3 is electrically connected to the stationary contact bracket 9, the tail end 32 of the moving contact 3 is disengaged from the quick-acting part 43, and the trigger part 42 returns to the initial position under the action of the first reset member 44.

[0028] like Figure 4As shown, the pressure-bearing component 431 includes a pressure-bearing plate 4311 and two arm plates 4312. When the circuit breaker is abnormally opened, the moving contact 3 presses against the pressure-bearing plate 4311. The two arm plates 4312 are respectively disposed on opposite sides of the pressure-bearing plate 4311, so that the pressure-bearing component 431 is U-shaped. Both arm plates 4312 are pivotally mounted to the support frame 41 via the first shaft 432. The trigger part 42 is provided with two receiving grooves 421, and the ends of the two arm plates 4312 away from the pressure-bearing plate 4311 respectively extend into the corresponding receiving grooves 421. By setting the pressure-bearing component 431 into a U-shaped structure, on the one hand, the structural strength and pressure-bearing capacity of the pressure-bearing component 431 are improved, and deformation is avoided when the tail end 32 of the moving contact 3 presses against the pressure plate 4311. On the other hand, the trigger part 42 is pushed to rotate by the two arm plates 4312 to ensure that the trigger part 42 is evenly stressed, so that the trigger part 42 can rotate stably to the trip position. Moreover, the impact force of the trigger part 42 on the traction rod 5 is increased, so that the traction rod 5 can be tripped quickly, which helps to shorten the tripping time and further increase the breaking capacity of the circuit breaker.

[0029] Furthermore, a flange 43120 is provided at one end of the arm plate 4312 that extends into the receiving groove 421. The flange 43120 extends away from the pressure plate 4311. By providing the flange 43120, the structural strength of the end of the arm plate 4312 away from the pressure plate 4311 is improved, which can effectively prevent the arm plate 4312 from deforming when pushing the trigger part 42, and improve the reliability and stability of the pressure member 431.

[0030] It should be noted that the quick-acting mechanism 4 is an electromagnetic tripping mechanism, which also includes a second shaft 45, a support frame 41 as an armature bracket, and a triggering part 42 as an armature. The armature is pivotally mounted to the armature bracket via the second shaft 45. By integrating the quick-acting part 43 into the electromagnetic tripping mechanism, the structure of the circuit breaker is simplified, and a compact installation of the quick-acting part 43 is achieved.

[0031] Specifically, such as Figure 4 As shown, the armature is rotatably mounted on the armature bracket via the second shaft 45. The electromagnetic trip device also includes a magnetic yoke 46. The support frame 41, trigger part 42, quick-acting part 43, and magnetic yoke 46 are all roughly U-shaped structures. The U-shaped opening of the trigger part 42 faces downward, while the U-shaped openings of the support frame 41, quick-acting part 43, and magnetic yoke 46 all face upward. The trigger part 42 is fastened to the support frame 41 and passes through the second shaft 45. The quick-acting part 43 and magnetic yoke 46 are both sleeved on the bottom of the armature bracket and located below the armature. The first reset member 44 can be a spring, tension spring, or torsion spring, etc. In this embodiment, the first reset member 44 is a torsion spring and is sleeved on the second shaft 45, and the two protruding arms of the torsion spring respectively abut against the armature and the armature bracket. Since the electromagnetic trip mechanism is prior art, the working principle of the electromagnetic trip mechanism will not be described in detail.

[0032] like Figure 9As shown, the trigger part 42 can also be connected to the quick-acting part 43 as a single unit, making the trigger a one-piece molded part. This configuration allows for one-piece molding of the trigger, reducing manufacturing difficulty and cost, and improving production efficiency. Specifically, since the trigger part 42 and the quick-acting part 43 are integrated, the quick-acting part 43 is no longer mounted on the support frame 41 via the first shaft 432, and the first reset part 44 is a tension spring. By structurally improving the armature of the electromagnetic tripping mechanism in the circuit breaker, a pressure-bearing structure can be provided for the armature facing the moving contact 3, thus fully utilizing the existing electromagnetic tripping mechanism in the circuit breaker without adding additional components, simplifying the circuit breaker's structure.

[0033] like Figure 5 and Figure 6 As shown, the circuit breaker also includes an arc-blocking component 6, which comprises a sleeve plate 61 and a protective plate 62. The sleeve plate 61 is disposed on the side of the moving contact 3 near the moving contact 30. One end of the protective plate 62 is connected to the sleeve plate 61, and the protective plate 62 is disposed circumferentially along the rotating shaft 2. The sleeve plate 61 is installed on the moving contact 3 so that the arc-blocking component 6 rotates synchronously with the moving contact 3. The protective plate 62 is an arc plate adapted to the rotating shaft 2 so that it is shielded on the outer periphery of the rotating shaft 2 when the circuit breaker trips. When the circuit breaker trips or encounters a large fault current, the moving contact 3 is pushed open and an arc is drawn, burning surrounding combustibles and producing carbon powder and metal particles. The protective plate 62 can effectively block the arc and particles that follow, ensuring the reliable operation of the moving contact 3 and improving the arc-blocking effect and safety of the circuit breaker.

[0034] Specifically, such as Figure 6As shown, the sleeve 61 includes a base plate 611 and two clamping plates 612, which are respectively disposed on opposite sides of the base plate 611. The moving contact 3 is clamped between the two clamping plates 612 and fits against the base plate 611. At least one clamping plate 612 is provided with a through hole 6121, and the moving contact 3 is provided with a corresponding positioning post 31, which passes through the corresponding through hole 6121. The moving contact 3 is provided with a slot 33, and the clamping plate 612 is provided with a protrusion 6122, which engages with the corresponding slot 33. The sleeve 61 has a U-shaped structure and clamps the moving contact 3 with the two clamping plates 612, so that the sleeve 61 is securely installed on the moving contact 3. At the same time, one clamping plate 612 is sleeved on the positioning post 31 of the moving contact 3 through the through hole 6121 to prevent the sleeve 61 from slipping off the moving contact 3, further realizing the secure assembly of the sleeve 61 and the moving contact 3. Furthermore, the top of both sides of the moving contact 3 along the thickness direction are provided with slots 33, and the protrusions 6122 engage with the corresponding slots 33. This achieves dual positioning based on the positioning engagement of the positioning post 31 and the through hole 6121, improving the connection strength between the sleeve plate 61 and the moving contact 3. Of course, in other embodiments, the sleeve plate 61 and the moving contact 3 can be positioned solely by the positioning post 31 and the through hole 6121; or, the sleeve plate 61 and the moving contact 3 can be engaged solely by the protrusions 6122 and the slots 33, as long as the stable assembly of the sleeve plate 61 with the moving contact 3 is ensured.

[0035] like Figure 7 and Figure 8 As shown, the circuit breaker also includes a self-holding assembly, which includes a self-holding component 7 and a second reset component 8. The self-holding component 7 includes a main body plate 71 and an inclined plate 72. One end of the main body plate 71 is rotatably mounted inside the rotating shaft 2, and the other end of the main body plate 71 is provided with the inclined plate 72, which is inclined towards the moving contact 30 of the moving contact 3. The moving contact 3 is provided with a protruding post 34. When the circuit breaker is working normally, the protruding post 34 abuts against the side of the main body plate 71 away from the moving contact 30 of the moving contact 3. When the moving contact 3 is abnormally repelled, the protruding post 34 presses against the inclined plate 72. The second reset component 8 is installed between the main body plate 71 and the moving contact 3. By setting the self-holding assembly, the moving contact 3 is kept at its highest point after being repelled, realizing the self-holding function and avoiding repeated bouncing and arcing of the moving contact 3 after abnormal repelling, so that the circuit breaker can quickly extinguish the arc during short-circuit breaking.

[0036] Specifically, the second reset element 8 can be a spring, tension spring, or torsion spring, etc. In this embodiment, the second reset element 8 is a spring, which has a simple structure and is easy to assemble. The moving contact 3 is rotatably mounted on the rotating shaft 2 via the third shaft 35. When the circuit breaker normally disconnects, the moving contact 3 rotates synchronously with the rotating shaft 2, and the protrusion 34 abuts against the main body plate 71. The second reset element 8 drives the moving contact 3 in a counterclockwise direction (with the main body plate 71) via the main body plate 71. Figure 8The moving contact 30 rotates in the opposite direction (as indicated by the middle arrow), causing the moving contact 30 to press down. When the moving contact 30 of the moving contact 3 is pushed open by the electric repulsive force, the rotating shaft 2 is fixed and cannot move due to the pressure of the operating mechanism. At this time, the moving contact 3 rotates clockwise (in the opposite direction). Figure 8 Rotate (in the direction indicated by the middle arrow) to raise the moving contact 30 and slide the protrusion 34 from the main plate 71 to the inclined plate 72, so as to change the force direction of the protrusion 34 and keep the moving contact 3 at the highest position, avoiding repeated bouncing and arcing of the moving contact 3.

[0037] It should be noted that the angle between the main plate 71 and the inclined plate 72 is 30°-50°. Specifically, the angle α can be 30°, 35°, 40°, 45° or 50°, etc., so that the inclined plate 72 has a suitable tilt angle, which improves the self-holding effect of the moving contact 3 while ensuring that the protruding post 34 slides smoothly into or out of the inclined plate 72.

[0038] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit breaker, characterized in that, It includes a housing (1), a rotating shaft (2) and a moving contact (3), wherein the rotating shaft (2) is rotatably disposed inside the housing (1) and the moving contact (3) is rotatably mounted on the rotating shaft (2). The circuit breaker also includes a quick-acting mechanism (4) and a traction rod (5). The quick-acting mechanism (4) includes a trigger and a first reset member (44). The trigger includes a trigger part (42) and a quick-acting part (43) that are connected in a transmission. The trigger part (42) is movably installed in the housing (1) and has an initial position that is disengaged from the traction rod (5) and a release position that pushes the traction rod (5) to release. When the circuit breaker is abnormally opened, the moving contact (3) presses against the quick-acting part (43) to drive the trigger part (42) to move to the tripping position through the quick-acting part (43); when the circuit breaker is working normally, the moving contact (3) disengages from the quick-acting part (43), and the trigger part (42) returns to the initial position under the action of the first reset member (44).

2. The circuit breaker according to claim 1, characterized in that, The quick-action mechanism (4) further includes a support frame (41), and the quick-action part (43) includes a pressure-bearing member (431) and a first shaft (432). The pressure-bearing member (431) is pivotally mounted to the support frame (41) via the first shaft (432). The trigger part (42) is provided with a receiving groove (421), and part of the pressure bearing member (431) extends into the receiving groove (421); when the circuit breaker is abnormally opened, the moving contact (3) presses against the pressure bearing member (431) and causes the pressure bearing member (431) to press against the inner wall of the receiving groove (421) to drive the trigger part (42) to move to the tripping position.

3. The circuit breaker according to claim 2, characterized in that, The pressure-bearing component (431) includes: When the circuit breaker is abnormally opened, the moving contact (3) presses against the pressure plate (4311). Two arm plates (4312) are respectively disposed on opposite sides of the pressure plate (4311) so that the pressure member (431) is U-shaped; both arm plates (4312) are pivotally mounted on the support frame (41) through the first shaft (432); the trigger part (42) is provided with two receiving grooves (421), and the ends of the two arm plates (4312) away from the pressure plate (4311) respectively extend into the corresponding receiving grooves (421).

4. The circuit breaker according to claim 3, characterized in that, The end of the arm plate (4312) that extends into the receiving groove (421) is provided with a flange (43120).

5. The circuit breaker according to claim 3, characterized in that, The quick-action mechanism (4) is an electromagnetic release mechanism, which also includes a second shaft (45). The support frame (41) is an armature support, and the trigger part (42) is an armature. The armature is pivotally mounted on the armature support via the second shaft (45).

6. The circuit breaker according to any one of claims 1-5, characterized in that, The trigger part (42) is connected to the fast-moving part (43) as a whole, so that the trigger is a one-piece molded part.

7. The circuit breaker according to any one of claims 1-5, characterized in that, The circuit breaker further includes an arc-blocking element (6), which includes: A sleeve (61) is disposed on the side of the moving contact (3) near the moving contact (30); A protective plate (62) is provided, one end of which is connected to the sleeve plate (61), and the protective plate (62) is arranged circumferentially along the rotating shaft (2).

8. The circuit breaker according to claim 7, characterized in that, The sleeve (61) includes a base plate (611) and two clamping plates (612), with the two clamping plates (612) respectively disposed on opposite sides of the base plate (611); the moving contact (3) is clamped between the two clamping plates (612) and attached to the base plate (611). At least one of the clamping plates (612) is provided with a through hole (6121), and the moving contact (3) is provided with a corresponding positioning post (31), the positioning post (31) passing through the corresponding through hole (6121); and / or, the moving contact (3) is provided with a slot (33), and the clamping plate (612) is provided with a protrusion (6122), the protrusion (6122) engaging with the corresponding slot (33).

9. The circuit breaker according to any one of claims 1-5, characterized in that, The circuit breaker also includes a self-sustaining component, which includes: The self-holding component (7) includes a main plate (71) and an inclined plate (72). One end of the main plate (71) is rotatably disposed within the rotating shaft (2), and the other end of the main plate (71) is provided with the inclined plate (72). The inclined plate (72) is inclined toward the moving contact (30) of the moving contact (3). The moving contact (3) is provided with a protruding post (34). When the circuit breaker is working normally, the protruding post (34) abuts against the side of the main plate (71) away from the moving contact (30) of the moving contact (3). When the moving contact (3) is abnormally repelled, the protruding post (34) presses against the inclined plate (72). The second reset member (8) is installed between the main body plate (71) and the moving contact (3).

10. The circuit breaker according to claim 9, characterized in that, The angle between the main plate (71) and the inclined plate (72) is 30°-50°.

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