Circuit breaker

Abstract

A circuit breaker comprises an operating mechanism, a rotating shaft, a draw bar and at least one phase pole unit, the phase pole unit comprises a static contact, a moving contact and a tripping protection mechanism, the moving contact of the phase pole unit is rotatably arranged on the rotating shaft, and the operating mechanism is connected with the rotating shaft and used for driving the rotating shaft to rotate. When the phase pole unit breaks down, the tripping protection mechanism can push the traction rod to trigger the operation mechanism to trip, the rotating shaft is provided with a triggering piece and a connecting rod, the two ends of the connecting rod are rotationally connected with the moving contact and the triggering piece respectively, and the tripping protection mechanism can push the traction rod to trigger the operation mechanism to trip when the phase pole unit breaks down. When the moving contact is driven by the electric repulsive force to rotate relative to the rotating shaft, the trigger piece can be driven by the connecting rod to move, so that the trigger piece drives the traction rod to trigger the operation mechanism to release, and the problems that the moving contact is small in repulsion distance under the driving of the electric repulsive force and cannot directly drive the trigger piece to unlock the connecting rod mechanism are solved.

Description

Technical Field

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

[0002] Circuit breakers are commonly used to control the on / off switching of circuits and can disconnect them in the event of a fault, protecting both the circuit and the load. The contact current-limiting structure is a critical component of circuit breakers, capable of disconnecting short-circuit currents before they reach their expected peak, thereby protecting circuits and equipment from damage caused by overloads or short circuits. However, current contact current-limiting structures in the industry generally suffer from a small contact opening distance, which prevents the operating mechanism from tripping, leading to contact drop and repeated opening. Furthermore, this process causes continuous arcing, resulting in burns to the silver point and contacts. Utility Model Content

[0003] The purpose of the present utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A circuit breaker comprises an operating mechanism, a rotating shaft, a traction rod and at least one phase pole unit, wherein the phase pole unit comprises a static contact, a moving contact and a tripping protection mechanism, the moving contact of the phase pole unit being rotatably arranged on the rotating shaft, the operating mechanism being connected to the rotating shaft and being used to drive the rotating shaft to rotate so that the rotating shaft drives the moving contact of the phase pole unit to contact and separate from the static contact, and the tripping protection mechanism can push the traction rod to trigger the operating mechanism to trip when a phase pole unit fails, a triggering member and a connecting rod are provided on the rotating shaft, the two ends of the connecting rod are rotatably connected to the moving contact and the triggering member respectively, and when the moving contact is driven by electric repulsive force to rotate relative to the rotating shaft, the triggering member can be driven to move through the connecting rod, so that the triggering member drives the traction rod to trigger the operating mechanism to trip.

[0006] Preferably, the rotating shaft is provided with a slide groove, the trigger member includes a sliding portion and a trigger portion connected to the sliding portion, the sliding portion is linearly slidably arranged in the slide groove, the sliding portion is connected to the connecting rod, and the trigger portion is used to drive the traction rod.

[0007] Preferably, the trigger member is provided with a retractable elastic member, the elastic member is provided with a limiting portion for extending out of the trigger member, and the rotating shaft is provided with a boss for blocking the limiting portion.

[0008] Preferably, before the trigger member rotates to the first angle, the sliding part drives the elastic member to move in the sliding groove. When the trigger member rotates to the first angle, the elastic member leaves the sliding groove and causes the limiting part to extend out of the sliding part. The boss blocks the limiting part, so that the trigger member cannot move back. When the trigger member rotates to the second angle, the moving contact drives the traction rod through the connecting rod to trigger the operating mechanism to trip. The second angle is greater than the first angle.

[0009] Preferably, the rotating shaft is provided with two bosses, and the sliding groove is provided between the two bosses. The two bosses are respectively a first boss and a second boss. The second boss is provided with a notch on the side away from the static contact, so that the side of the second boss away from the static contact is provided with a space for extending the limit part, and the second boss is used to block the elastic part of the trigger part from extending.

[0010] Preferably, the elastic member includes two elastic parts arranged at an oblique angle, one ends of the two elastic parts are connected, and the connected ends of the two elastic parts constitute the limiting part.

[0011] Preferably, the trigger member is provided with a limiting groove for accommodating the elastic member, and two limiting surfaces are provided at intervals on the groove wall of the limiting groove, and a limiting through hole for passing the limiting portion is provided between the two limiting surfaces, and the other ends of the two elastic portions are respectively provided with bent portions bent away from each other, and the two limiting surfaces are respectively used to limit the bent portions of the elastic member, and the limiting portion extends from the limiting through hole to the outside of the limiting groove when the elastic member is not compressed. When the elastic member is compressed, the two elastic portions are driven away from each other, so that the limiting portion retracts into the limiting groove.

[0012] Preferably, the sliding portion and the triggering portion of the triggering member are both rod-shaped, and the end of the triggering portion away from the sliding portion is inclined toward the side close to the traction rod, so that the sliding portion and the triggering portion are arranged at an obtuse angle.

[0013] Preferably, the trigger portion has an end away from the sliding portion and is provided with a chamfer for pushing the traction rod.

[0014] Preferably, the connecting rod is U-shaped, and includes a first connecting portion and a second connecting portion that are relatively arranged, and a third connecting portion connected between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are rotationally connected to the moving contact and the trigger member respectively.

[0015] Preferably, when the moving contact rotates away from the static contact under the drive of electric repulsion, the third connecting part rotates in a direction in which the angle with the length direction of the slide groove decreases, and the second connecting part moves along the slide groove and drives the trigger member to slide linearly along the length direction of the slide groove.

[0016] Preferably, when the circuit breaker is opened, the operating mechanism drives the rotating shaft to rotate, and the moving contact, connecting rod and trigger member rotate with the rotating shaft, and the trigger member is away from the traction rod. When the circuit breaker is closed, the operating mechanism drives the rotating shaft to rotate, and the moving contact, connecting rod and trigger member rotate with the rotating shaft, and the trigger member is close to the traction rod.

[0017] The circuit breaker of the present invention can utilize the electric repulsion force generated by large current on the moving contact and the static contact for rapid tripping. It can trigger the operating mechanism to trip faster than a short-circuit electromagnetic release or other tripping protection mechanisms, thereby accelerating the tripping action and avoiding damage to the contact system caused by excessive tripping time. The moving contact and the trigger member are connected by a connecting rod. When the moving contact is subjected to the electric repulsion force, the moving contact does not need to directly drive the trigger member to trigger the connecting rod mechanism to unlock. Instead, the connecting rod drives the trigger member to trigger the connecting rod mechanism to unlock. In the process of the moving contact driving the connecting rod to push the trigger member, the connecting rod can rotate relative to the moving contact. Even if the moving contact has a small repulsion distance and an insufficient rotation angle, the connecting rod can rotate between the moving contact and the trigger member to maintain a sufficient distance for pushing the trigger member to move, thereby avoiding the problem that the moving contact has a small repulsion distance under the drive of the electric repulsion force and cannot directly drive the trigger member to unlock the connecting rod mechanism.

[0018] In addition, the trigger member is arranged on the rotating shaft in a linear sliding manner, and the trigger member does not need to be arranged on the rotating shaft in a rotating manner. The trigger member that moves linearly is not only more reliable during the movement process, but also has the characteristic of occupying less space.

[0019] In addition, by blocking the retractable elastic part through the boss, when the moving contact is repelled and the trigger part rotates to an angle greater than the first angle, it will not fall back, which can avoid the problem of repeated repelling of the moving contact and continuous arcing, and thus avoid burning of the moving contact and the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the first position of the moving contact of the utility model;

[0021] Figure 2 This utility model Figure 1 A partial enlarged view of

[0022] Figure 3 This is the position of the elastic member of the utility model before it extends;

[0023] Figure 4 This utility model Figure 3 A partial enlarged view of

[0024] Figure 5 This is the position after the elastic member of the utility model is extended;

[0025] Figure 6 This utility model Figure 5 A partial enlarged view of

[0026] Figure 7 This is a schematic structural diagram of the triggering member of the utility model;

[0027] In the picture:

[0028] 1 Operating mechanism

[0029] 2 shafts

[0030] 3 Tow bar

[0031] 4-phase pole unit

[0032] 5 trigger

[0033] 6 connecting rod

[0034] 7 Elastic parts

[0035] 20 chutes

[0036] 21 First boss

[0037] 22 Second boss

[0038] 23 Gap

[0039] 41 static contact

[0040] 42 moving contacts

[0041] 51 Sliding part

[0042] 52 Trigger

[0043] 53 limiting groove

[0044] 54 Limiting surface

[0045] 55 limit through hole

[0046] 61 First connection

[0047] 62 Second connection

[0048] 63 Third connection

[0049] 71 Limiting part

[0050] 72 elastic part

[0051] 73 bend DETAILED DESCRIPTION

[0052] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0053] like Figure 1As shown, the circuit breaker of this embodiment includes an operating mechanism 1, a rotating shaft 2, a drawbar 3, and at least one phase pole unit 4. The phase pole unit 4 includes a static contact 41, a moving contact 42, and a tripping protection mechanism (not shown). The moving contact 42 of the phase pole unit 4 is rotatably mounted on the rotating shaft 2. A contact spring is provided between the moving contact 42 and the rotating shaft 2. The contact spring presses the moving contact 42 against the rotating shaft 2. The contact spring also provides overtravel, providing contact pressure when the moving contact 42 contacts the static contact 41. The operating mechanism 1 is connected to the rotating shaft 2 to drive the rotating shaft 2 to rotate, so that the rotating shaft 2 drives the moving contact 42 of the phase pole unit 4 to contact and separate from the static contact 41. The tripping protection mechanism can push the drawbar 3 to trigger the operating mechanism to trip when a phase pole unit 4 fails. The circuit breaker of this embodiment includes three phase pole units 4. One operating mechanism 1 drives the rotating shaft 2 to rotate, driving the moving contacts 42 of the three phase pole units 4 to rotate synchronously.

[0054] The operating mechanism 1 includes a connecting rod mechanism and an energy storage mechanism. The connecting rod mechanism is connected to the rotating shaft 2 to drive the rotating shaft 2 to rotate, and when the moving contact 42 contacts the static contact 41, the energy storage mechanism is locked in the energy storage state. The connecting rod mechanism usually includes a lock and a jumper that are snap-fitted. The energy storage mechanism is a spring. When the lock and the jumper are snap-fitted, the operating mechanism can drive the rotating shaft 2 to rotate. The traction rod 3 is matched with the tripping protection mechanism. When an overload and / or short-circuit fault occurs in the current passing through the phase pole unit 4, the tripping protection mechanism can push the traction rod 3 to unlock the connecting rod mechanism of the operating mechanism 1, that is, drive the lock to release the snap fit with the jumper to trip the operating mechanism, release the energy storage mechanism to drive the rotating shaft 2 to rotate, separate the moving contact 42 from the static contact 41, and realize the overload and / or short-circuit fault protection function. This is the existing technology in this field and will not be repeated here.

[0055] An improvement of this embodiment is that a trigger member 5 and a connecting rod 6 are provided on the rotating shaft 2, and the two ends of the connecting rod 6 are respectively rotatably connected to the moving contact 42 and the trigger member 5. When the moving contact 42 is driven by the electric repulsive force to rotate relative to the rotating shaft 2, the trigger member 5 can be driven to move through the connecting rod 6, so that the trigger member 5 drives the traction rod 3 to trigger the operating mechanism to trip, that is, the trigger member 5 drives the traction rod 3 to drive the lock to release the hasp fit with the jump buckle, release the energy storage mechanism to drive the rotating shaft 2 to rotate, so that the rotating shaft 2 drives the moving contact 42 to separate from the static contact 41.

[0056] The circuit breaker of this embodiment can quickly trip by utilizing the electric repulsive force generated by large current between the moving contact and the static contact. It can trigger the operating mechanism to trip faster than a short-circuit electromagnetic release or other tripping protection mechanisms, thereby accelerating the tripping action and avoiding damage to the contact system caused by excessive tripping time. In addition, the moving contact 42 is connected to the trigger member 5 by a connecting rod 6. When the moving contact 42 is subjected to the electric repulsive force, the moving contact 42 does not need to directly drive the trigger member 5 to trigger the unlocking of the connecting rod mechanism. Instead, the connecting rod 6 drives the trigger member 5 to trigger the unlocking of the connecting rod mechanism. In the process of the moving contact 42 driving the connecting rod 6 to push the trigger member 5, the connecting rod 6 can rotate relative to the moving contact 42. Even if the moving contact 42 is repelled by a small distance and the rotation angle is insufficient, the connecting rod 6 can rotate between the moving contact 42 and the trigger member 5 to maintain a sufficient distance for pushing the trigger member 5, thereby avoiding the problem that the moving contact 42 is repelled by the electric repulsive force and cannot directly drive the trigger member 5 to unlock the connecting rod mechanism.

[0057] like Figure 1-4 The first embodiment is shown, wherein the rotating shaft 2 is provided with a slide groove 20, and the trigger member 5 includes a sliding portion 51 and a trigger portion 52 connected to the sliding portion 51. The sliding portion 51 is linearly slidably arranged in the slide groove 20, and the sliding portion 51 is connected to the connecting rod 6. The trigger portion 52 is used to drive the traction rod 3. The connecting rod 6 is U-shaped and includes a first connecting portion 61 and a second connecting portion 62 arranged opposite to each other, and a third connecting portion 63 connected between the first connecting portion 61 and the second connecting portion 62. The first connecting portion 61 The second connecting portion 62 is rotatably connected to the moving contact 42 and the trigger member 5 respectively. The second connecting portion 62 for connecting the trigger member 5 is inserted into the slide groove 20 and connected to the sliding portion 51. The third connecting portion 63 is set at an oblique angle to the length direction of the slide groove 20. When the moving contact 42 rotates away from the static contact 41 under the drive of the electric repulsive force, the third connecting portion 63 rotates in the direction of reducing the angle with the length direction of the slide groove 20. The second connecting portion 62 moves along the slide groove 20 and drives the trigger member 5 to slide linearly along the length direction of the slide groove 20.

[0058] In the circuit breaker of this embodiment, the trigger member 5 is linearly slidably arranged on the rotating shaft 2. The trigger member 5 does not need to be rotated on the rotating shaft 2. The linearly moving trigger member 5 is not only more reliable during the movement process, but also has the characteristic of occupying less space.

[0059] like Figure 2 As shown, the trigger member 5 is V-shaped, and the sliding portion 51 and the trigger portion 52 of the trigger member 5 are both rod-shaped. The sliding portion 51 is provided with a second connecting hole rotatably connected to the second connecting portion 62 of the connecting rod 6. The end of the trigger portion 52 away from the sliding portion 51 is inclined toward the side close to the traction rod 3, so that the sliding portion 51 and the trigger portion 52 are arranged at an obtuse angle in the length direction. The end of the trigger portion 52 away from the sliding portion 51 is provided with a chamfer for pushing the traction rod 3.

[0060] like Figure 2 As shown, the operating mechanism 1 is arranged on the side of the rotating shaft 2 away from the static contact 41, and the rotating shaft 2 is provided with two bosses on the side of the moving contact 42 away from the static contact 41. The two bosses are arranged at intervals, and the slide groove 20 is provided between the two bosses. A retractable elastic member 7 is provided in the sliding portion 51 of the trigger member 5, and the elastic member 7 is provided with a limiting portion 71 for extending outside the trigger member 5.

[0061] like Figure 1-2 As shown, when the moving contact 42 contacts the stationary contact 41, the trigger member 5 drives the limiting portion 71 to contact the boss. The driving force indirectly applied by the rotating shaft 2 to the limiting portion 71 through the boss is greater than the elasticity of the elastic member 7 itself, so that the boss compresses the elastic member 7 and drives the limiting portion 71 to retract into the trigger member 5.

[0062] When a short circuit occurs in the circuit breaker, a huge electric repulsive force is generated between the moving contact 42 and the static contact 41 due to the huge short circuit current. The electric repulsive force drives the moving contact 42 to separate from the static contact 41, causing the moving contact 42 to rotate relative to the rotating shaft 2. When the moving contact 42 is repelled by the electric repulsive force, before the trigger member 5 rotates to the first angle, the sliding portion 51 drives the elastic member 7 to move in the sliding groove 20. When the trigger member 5 rotates to the first angle ( Figure 3-4 ), the elastic member 7 leaves the slide groove 20 and causes the limiting portion 71 to extend out of the sliding portion 51. If the movable contact 42 moves back, the limiting portion 71 is blocked by the boss, so that the trigger member 5 cannot move back, thereby preventing the movable contact 42 from falling back. At this time, the force acting on the movable contact 42 to fall back is smaller than the elastic force of the elastic member 7, and the limiting portion 71 will not retract the trigger member 5;

[0063] When the trigger member 5 rotates to the second angle ( Figure 5-6 ), the movable contact 42 drives the traction rod 3 through the connecting rod 6 to trigger the operating mechanism to trip. The rotating shaft 2 drives the movable contact 42 to continue rotating, causing the movable contact 42 to rotate to a position farther from the static contact 41. The second angle is greater than the first angle. The boss blocks the elastic member 7. Before the movable contact 42 is repelled to a position sufficient to unlock the connecting rod mechanism, as long as the trigger member 5 rotates at an angle greater than the first angle, it will not fall back. This can prevent the movable contact 42 from repeatedly repelling and continuously arcing, thereby preventing damage to the movable contact 42 and the static contact 41. If the rotating angle of the movable contact 42 is less than the first angle, it means that the electric repulsive force is not strong enough, which can also prevent erroneous operation.

[0064] Specifically, the two bosses are respectively a first boss 21 and a second boss 22, the first boss 21 is arranged above the second boss 22, and the second boss 22 is provided with a notch 23 on the side away from the static contact 41, so that the side of the second boss 22 away from the static contact 41 is provided with a space for extending the limit portion 71, and the second boss 22 is used to block the elastic member 7 from extending the trigger member 5. The elastic member 7 has a V-shaped structure, and the elastic member 7 includes two elastic portions 72 arranged at an oblique angle, one end of the two elastic portions 72 is connected, and the end at which the two elastic portions 72 are connected constitutes the limit portion 71, and the two elastic portions 7 2 are respectively provided with curved portions 73 that are bent away from each other. The sliding portion 51 is provided with a limiting groove 53 for accommodating the elastic member 7. The limiting groove 53 is provided with two limiting surfaces 54 spaced apart on the groove wall near the second boss 22. A limiting through hole 55 for passing the limiting portion 71 is provided between the two limiting surfaces 54. The two limiting surfaces 54 are respectively used to limit the curved portions 73 of the elastic member 7. When the elastic member 7 is not compressed, the limiting portion 71 extends from the limiting through hole 55 to the outside of the limiting groove 53. When the elastic member 7 is compressed, the two elastic portions 72 are driven away from each other, so that the limiting portion 71 retracts into the limiting groove 53.

[0065] Of course, the elastic member 7 may also adopt other shapes, such as an L-shape, where one end of the elastic member 7 is located in the limiting groove 53 and the other end extends out of the limiting groove 53, or the elastic member 7 is in the form of a spring, and a limiting portion 71 is provided on the spring so that the spring drives the limiting portion 71 to extend out of the limiting groove 53, all of which fall within the protection scope of the present invention.

[0066] refer to Figure 1 When the circuit breaker performs normal opening and closing operations, the operating mechanism drives the rotating shaft 2 to rotate, and the rotating shaft 2 drives the moving contact 42 to rotate synchronously to contact and separate with the static contact 41. There is no relative movement between the moving contact 42 and the rotating shaft 2, and the moving contact 42 will not drive the trigger member 5 through the connecting rod 6. When opening, the operating mechanism drives the rotating shaft 2 to rotate, and the moving contact 42, the connecting rod 6 and the trigger member 5 rotate with the rotating shaft 2, and the trigger member 5 moves away from the traction rod 3. When closing, the operating mechanism drives the rotating shaft 2 to rotate, and the moving contact 42, the connecting rod 6 and the trigger member 5 rotate with the rotating shaft 2, and the trigger member 5 moves close to the traction rod 3.

[0067] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0068] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism (1), a rotating shaft (2), a traction rod (3) and at least one phase pole unit (4), wherein the phase pole unit (4) comprises a static contact (41), a moving contact (42) and a tripping protection mechanism, wherein the moving contact (42) of the phase pole unit (4) is rotatably arranged on the rotating shaft (2), the operating mechanism (1) is connected to the rotating shaft (2) and is used to drive the rotating shaft (2) to rotate, so that the rotating shaft (2) drives the moving contact (42) of the phase pole unit (4) to contact and separate with the static contact (41), and the tripping protection mechanism can push the traction rod (3) to trigger the operating mechanism to trip when a fault occurs in the phase pole unit (4), characterized in that: A trigger member (5) and a connecting rod (6) are provided on the rotating shaft (2). The two ends of the connecting rod (6) are rotatably connected to the moving contact (42) and the trigger member (5) respectively. When the moving contact (42) is driven by an electric repulsive force to rotate relative to the rotating shaft (2), the trigger member (5) can be driven to move via the connecting rod (6), so that the trigger member (5) drives the traction rod (3) to trigger the operating mechanism to trip.

2. The circuit breaker according to claim 1, wherein: The rotating shaft (2) is provided with a sliding groove (20), and the triggering member (5) comprises a sliding portion (51) and a triggering portion (52) connected to the sliding portion (51). The sliding portion (51) is linearly slidably arranged in the sliding groove (20), the sliding portion (51) is connected to the connecting rod (6), and the triggering portion (52) is used to drive the traction rod (3).

3. The circuit breaker according to claim 2, wherein: The trigger member (5) is provided with a retractable elastic member (7), the elastic member (7) is provided with a limiting portion (71) for extending outside the trigger member (5), and the rotating shaft (2) is provided with a boss for blocking the limiting portion (71).

4. The circuit breaker according to claim 3, wherein: Before the trigger member (5) rotates to the first angle, the sliding portion (51) drives the elastic member (7) to move in the sliding groove (20); when the trigger member (5) rotates to the first angle, the elastic member (7) leaves the sliding groove (20) and causes the limiting portion (71) to extend out of the sliding portion (51); the boss blocks the limiting portion (71), so that the trigger member (5) cannot move back; when the trigger member (5) rotates to the second angle, the moving contact (42) drives the traction rod (3) through the connecting rod (6) to trigger the operating mechanism to trip; the second angle is greater than the first angle.

5. The circuit breaker according to claim 3, wherein: The rotating shaft (2) is provided with two bosses, and the sliding groove (20) is provided between the two bosses. The two bosses are respectively a first boss (21) and a second boss (22). The second boss (22) is provided with a notch (23) on the side away from the static contact (41), so that the side of the second boss (22) away from the static contact (41) is provided with a space for extending the limiting portion (71). The second boss (22) is used to block the elastic member (7) from extending the trigger member (5).

6. The circuit breaker according to claim 3, wherein: The elastic member (7) comprises two elastic parts (72) arranged at an oblique angle, one end of the two elastic parts (72) is connected, and the connected end of the two elastic parts (72) constitutes the limiting part (71).

7. The circuit breaker according to claim 6, characterized in that: The trigger member (5) is provided with a limiting groove (53) for accommodating the elastic member (7); two limiting surfaces (54) are provided on the groove wall of the limiting groove (53); a limiting through hole (55) for passing the limiting portion (71) is provided between the two limiting surfaces (54); the other ends of the two elastic portions (72) are respectively provided with curved portions (73) that are bent away from each other; the two limiting surfaces (54) are respectively used to limit the curved portions (73) of the elastic member (7); the limiting portion (71) extends from the limiting through hole (55) to the outside of the limiting groove (53) when the elastic member (7) is not compressed; when the elastic member (7) is compressed, the two elastic portions (72) are driven away from each other, so that the limiting portion (71) retracts into the limiting groove (53).

8. The circuit breaker according to claim 2, wherein: The sliding portion (51) and the trigger portion (52) of the trigger member (5) are both rod-shaped, and the end of the trigger portion (52) away from the sliding portion (51) is inclined toward the side close to the traction rod (3), so that the sliding portion (51) and the trigger portion (52) are arranged at an obtuse angle.

9. The circuit breaker according to any one of claims 2 to 8, characterized in that: An end of the trigger portion (52) away from the sliding portion (51) is provided with a chamfer for pushing the traction rod (3).

10. The circuit breaker according to claim 2, wherein: The connecting rod (6) is U-shaped and comprises a first connecting portion (61) and a second connecting portion (62) arranged opposite to each other, and a third connecting portion (63) connected between the first connecting portion (61) and the second connecting portion (62). The first connecting portion (61) and the second connecting portion (62) are rotatably connected to the moving contact (42) and the trigger member (5), respectively.

11. The circuit breaker according to claim 10, wherein: When the movable contact (42) is driven by the electric repulsive force to rotate away from the static contact (41), the third connecting portion (63) rotates in a direction in which the angle with the length direction of the slide groove (20) decreases, and the second connecting portion (62) moves along the slide groove (20) and drives the trigger member (5) to slide linearly along the length direction of the slide groove (20).

12. The circuit breaker according to claim 1, wherein: When the circuit breaker is opened, the operating mechanism drives the rotating shaft (2) to rotate, and the moving contact (42), the connecting rod (6) and the triggering member (5) rotate along with the rotating shaft (2), and the triggering member (5) is away from the traction rod (3); when the circuit breaker is closed, the operating mechanism drives the rotating shaft (2) to rotate, and the moving contact (42), the connecting rod (6) and the triggering member (5) rotate along with the rotating shaft (2), and the triggering member (5) is close to the traction rod (3).

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