A moving contact mechanism of a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a moving contact mechanism inside the circuit breaker. The present invention adopts the following technical solution: a moving contact mechanism of a circuit breaker, characterized in that: a slide groove is arranged above the first side of a moving contact mounting seat, the slide groove has a curved portion and a straight portion, the curved portion is curved upward on the side close to the circuit breaker handle, a resisting arm is arranged on the lock buckle, the resisting arm matches the slide groove to lock or release the handle connecting rod of the circuit breaker, and by adopting the above solution, the present invention overcomes the problems existing in the prior art and provides a new type of moving contact mechanism of a circuit breaker with a reasonable structure and stable operation.

Description

Technical Field

[0001] The invention relates to a circuit breaker, in particular to a moving contact mechanism inside the circuit breaker. Background Art

[0002] The structure of the moving contact mechanism of the existing circuit breaker is unreasonable, and it is easy to get stuck. In addition, the installation of the N-pole moving contact and the L-pole moving contact is unreasonable, which is prone to lag when tripping. The lock and the mounting seat are prone to adhesion or increased friction. Finally, the rotation direction of the existing circuit breaker handle is always the same and cannot be reversed, which limits its scope of use. Summary of the invention

[0003] The present invention overcomes the problems existing in the prior art and provides a novel movable contact mechanism of a leakage circuit breaker with reasonable structure and stable operation.

[0004] To achieve the above object, the present invention adopts the following technical solution: a moving contact mechanism of a circuit breaker, comprising a moving contact mounting seat, a lock, an L-pole moving contact and an N-pole moving contact, and mounting columns are arranged on both sides of the moving contact mounting seat and located on the same axis. The L-pole moving contact and the N-pole moving contact are respectively movably arranged on the mounting posts on both sides of the moving contact mounting seat, and the side of the moving contact mounting seat for mounting the L-pole moving contact is the first side, and the side of the moving contact mounting seat for mounting the N-pole moving contact is the second side, characterized in that: a slide groove is arranged above the first side of the moving contact mounting seat, the slide groove has a curved portion and a straight portion, the curved portion is bent upward on the side close to the circuit breaker handle, and a resistance arm is arranged on the lock buckle, which matches the slide groove to lock or release the handle connecting rod of the circuit breaker, a boss is arranged around the straight portion of the slide groove, and a positioning block is arranged below the boss, an arc-shaped convex column is arranged around the bottom of the mounting post on the first side of the moving contact mounting seat, a convex rib is arranged on the plane around the mounting post on the first side of the moving contact mounting seat, a mounting through hole is arranged on the lock buckle, the mounting through hole of the lock buckle is sleeved on the first side mounting post and forms a rotational match with the arc-shaped convex column, and the L-pole moving contact sleeve is arranged The cam is provided with a first latch, and the second latch is provided with a first torsion spring, the first torsion spring being arranged on the side surface of the cam and the first torsion spring being arranged on the bottom surface of the cam.

[0005] By adopting the above solution, the chute is arranged to be connected with the handle link in the circuit breaker. The chute is provided with a bent portion and a straight portion, so that it can cooperate with the contact arm of the latch to position one end of the handle link, enabling it to be placed in the bent portion or slide into the straight portion. When one end of the handle link is placed in the bent portion and the circuit breaker handle is operated, the handle link can drive the moving contact seat to rotate. Specifically, the end of the handle link is always placed in the bent portion under the action of the contact arm, realizing the closing operation of the circuit breaker. When the latch moves under an external force, the contact arm of the latch leaves above the bent portion of the chute, that is, it loses the contact with the handle link. Then the handle link slides into the straight portion under the action of the side wall of the bent portion of the chute and the handle, and the moving contact mounting seat rotates to trip the circuit breaker. And here, the side of the bent portion close to the handle is arranged upward, so that the rotation direction of the handle is completely opposite to that of the traditional circuit breaker, overcoming the problem that the original handle cannot be tripped and closed in the opposite direction; when the latch rotates and cooperates with the arc-shaped convex column, there will be a gap, and dust will enter the gap, and there will be no adhesion and the problem of being stuck due to increased friction affected by dust. The setting of the rib is to reduce the friction; the L-pole moving contact is very convenient to install in the above way. In addition, the two arms of the first torsion spring are firmly fixed on the mounting seat and can well limit the rotation range of the L-pole moving contact. At the same time, the L-pole moving contact is closer to the static contact when closing, and will rotate first under the condition of large current, which is beneficial to quick tripping.

[0006] A further setting of the present invention is that: above the mounting post on the second side of the moving contact mounting seat, there is a connecting post. Around the connecting post, there is a convex edge provided. On the convex edge, there are a contact surface and a contact boss respectively. A third torsion spring is sleeved on the connecting post. The first torsion arm of the third torsion spring abuts on the contact surface, and the second torsion arm of the third torsion spring can abut on the contact boss. Below the contact boss, there is a second stop block. A positioning notch is formed between the second stop block and the side surface of the second side of the moving contact mounting seat. There is a second bayonet on the N-pole moving contact. On the second side of the moving contact mounting seat and corresponding to the second bayonet, there is a second concave cavity. The N-pole moving contact is sleeved on the mounting post on the second side of the moving contact mounting seat. And between the N-pole moving contact and the moving contact mounting seat, there is a second torsion spring, and the second torsion spring is also sleeved on the mounting post on the second side of the moving contact mounting seat. The first torsion arm of the second torsion spring abuts on the positioning notch, the second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact, and the end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. On the second side of the moving contact mounting seat, there is a positioning convex block. On the N-pole moving contact and between the positioning convex block and the contact boss, there is an N-pole limiting block. The abutment between the N-pole limiting block and the positioning convex block or the contact boss constitutes the limit of the rotation angle of the N-pole moving contact.

[0007] By adopting the above scheme, the function of the N-pole moving contact is the same as that of the L-pole moving contact. In addition, the connecting column is arranged in the above manner, and a convex edge is arranged around it to protect the connecting column well. Even if the connecting column is broken, it does not affect the function of the third torsion spring. The interference boss arrangement on the convex edge can make the second interference arm of the third torsion spring temporarily interfere with the interference boss. When the circuit breaker base is installed, the bevel on the base can be inserted into the convex block on the base, so that mechanized installation can be realized.

[0008] A further arrangement of the present invention is that: the first torsion arm of the first torsion spring is placed near the stop block of the limiting groove, the width of the space of the limiting groove in the first torsion arm of the first torsion spring is greater than the thickness of the L-pole moving contact, and the L-pole moving contact rotates its positioning piece side to be inserted into the space of the limiting groove in the first torsion arm, and the first torsion arm of the second torsion spring is placed near the stop block of the positioning recess, the width of the space of the positioning recess in the first torsion arm of the second torsion spring is greater than the thickness of the N-pole moving contact, and the N-pole moving contact rotates its limiting block side to be inserted into the space of the positioning recess in the first torsion arm of the second torsion spring.

[0009] By adopting the above scheme, in which the limiting groove and the first torsion arm of the first torsion spring are arranged using the above scheme, it can be ensured that the range of movement of the positioning plate is not affected. In addition, the rotation of the positioning plate will not affect the torsion spring, and the two do not interfere with each other. Similarly, the positioning recess, the second torsion spring and the limiting block also have the same function.

[0010] A further configuration of the present invention is that a convex rib or a groove is provided on the circumferential surface of the moving contact mounting seat and between the positioning piece of the L-pole moving contact and the N-limit block, a convex piece is provided below the lock catch, an arc-shaped contact surface is provided on the lock catch at a position corresponding to the top rod of the circuit breaker releaser, and a contact inclined surface is provided on the lock catch and above the mounting column.

[0011] By adopting the above scheme, convex ribs or grooves are arranged on the peripheral surface of the moving contact mounting seat, the purpose of which is to increase the creepage distance. Since the positioning piece and the limit block are relatively close at this position, it is not easy to burn the product; the convex piece is arranged for the double metal pull rod to pull, the arc-shaped contact surface is arranged to facilitate the releaser top rod to push it, and the contact inclined surface is to facilitate the lock top rod to push the lock.

[0012] The final setting of the utility model is: a groove is arranged around the bottom of the slide slot, the lower side surface of the curved portion of the slide slot and the side surface of the corresponding position on the boss are integrally arranged to form a pressure surface, after the circuit breaker is closed, the connecting end of the circuit breaker handle connecting rod abuts against the pressure surface, and the angle between the thrust direction of the circuit breaker handle on the connecting end of the handle connecting rod and the thrust direction of the pressure surface on the connecting end of the handle connecting rod is less than 180 degrees, and the moving contact mounting seat is provided with an opening and closing indicator plate above the slide slot.

[0013] By adopting the above scheme, the safety of the product is increased, wherein the setting of the groove can prevent dust and the like from entering without affecting the movement of the handle connecting rod; the limitation of the upper pressing surface is to satisfy the requirement that the pressing surface presses the handle connecting rod firmly when closing the circuit breaker, and to ensure that when the handle connecting rod rotates and disengages from the handle connecting rod when the lock is rotated, the end of the connecting rod can slide into the straight part of the slide groove to disconnect the circuit breaker; it should be noted here that the angle between the thrust direction of the handle on the connecting end of the handle connecting rod and the thrust direction of the pressing surface on the connecting end of the handle connecting rod is less than 180 degrees, so that the resultant force generated by the two forces is upward; if the upper part of the handle connecting rod end is blocked by the lock contact arm, the handle connecting rod end is placed in the curved part of the slide groove and does not move; if the lock contact arm above the handle connecting rod end leaves, the handle connecting rod end slides into the straight part of the slide groove under the action of the upward force to realize opening the circuit breaker.

[0014] The present invention will be further described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the present invention;

[0016] Figure 2 It is a three-dimensional diagram reflecting the third torsion spring of the embodiment of the present invention;

[0017] Figure 3 A three-dimensional diagram of a moving contact mounting seat according to an embodiment of the present invention;

[0018] Figure 4 This is a three-dimensional diagram of a connecting column of a moving contact mounting seat according to an embodiment of the present invention;

[0019] Figure 5 A three-dimensional diagram of the lock and the moving contact mounting seat in cooperation with each other according to an embodiment of the present invention;

[0020] Figure 6 This is a structural diagram of the embodiment of the present invention reflecting the force generated between the handle connecting rod and the contact surface of the sliding groove when the circuit breaker is closed;

[0021] Figure 7 for Figure 6 Schematic diagram of the force direction;

[0022] Figure 8 It is a three-dimensional diagram of a moving contact seat according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] like Figure 1-8As shown, a moving contact mechanism of a circuit breaker includes a moving contact mounting seat 1, a lock 2, an L-pole moving contact 3 and an N-pole moving contact 4. Mounting columns 14 are arranged on both sides of the moving contact mounting seat 1 and are located on the same axis. The L-pole moving contact 3 and the N-pole moving contact 4 are movably arranged on the mounting columns 14 on both sides of the moving contact mounting seat 1. The side of the moving contact mounting seat 1 on which the L-pole moving contact 3 is mounted is the first side 11, and the side on which the N-pole moving contact 4 is mounted is the second side 12. A slide groove 111 is arranged above the first side 11 of the moving contact mounting seat 1. The slide groove 111 has a curved portion 1111 and a straight portion 1112. The curved portion 1111 is bent upward on the side close to the circuit breaker handle. A resisting arm 22 is arranged on the lock buckle 2. The resisting arm 22 matches the slide groove 111 to lock or release the handle connecting rod of the circuit breaker. A boss 112 is arranged around the straight portion 1112 of the slide groove 111, and a positioning block 113 is arranged below the boss 112. An arc-shaped boss 114 is arranged around the bottom of the mounting column 14 on the first side 11 of the moving contact mounting seat 1, and a convex rib 115 is arranged on the plane around the mounting column 14 on the first side 11 of the moving contact mounting seat 1. The lock buckle 2 is provided with a mounting through hole 21, and the mounting through hole 21 of the lock buckle 2 is sleeved on the first side mounting column 14 and forms a rotational fit with the arc-shaped protruding column 114. The L-pole moving contact 3 is sleeved on the mounting column 14 of the first side 11 and its side surface contacts or is close to the end of the arc-shaped protruding column 114. The L-pole moving contact 3 is provided with a first bayonet 31, and a concave cavity 15 is provided on the moving contact mounting seat 1 and at a position corresponding to the first bayonet 31. A stopper 1121 is provided below the boss 112, and a limiting groove 1122 is formed between the stopper 1121 and the side surface of the first side 11 of the moving contact mounting seat 1, and a stopper 1122 is provided between the L-pole moving contact 3 and the moving contact mounting seat 1. There is a first torsion spring 5, which is also sleeved on the mounting column 14 of the first side 11. The first torsion arm of the first torsion spring 5 abuts against the limiting groove 1122 below the boss 112, and the second torsion arm of the first torsion spring 5 abuts against the first bayonet 31 of the L-pole moving contact 3. The end wall of the second torsion arm of the first torsion spring 5 has a bending portion, which is inserted into the concave cavity 15 below the first bayonet 31. A positioning piece 32 is provided on the L-pole moving contact 3, and the positioning piece 32 is located between the positioning block 113 and the boss 112 of the moving contact mounting seat 1. The abutment between the positioning piece 32 and the positioning block 113 or the boss 112 constitutes a limit to the rotation angle of the L-pole moving contact 3.The above scheme is adopted, wherein the purpose of setting the slide groove 111 is to connect with the handle connecting rod in the circuit breaker, and the slide groove 111 is provided with a curved portion 1111 and a straight portion 1112, so that one end of the handle connecting rod can be positioned in cooperation with the interference arm 22 of the lock catch 2, so that it is placed in the curved portion 1111 or slides into the straight portion 1112, wherein when one end of the handle connecting rod is placed in the curved portion 1111, the circuit breaker handle is operated, and at this time, the handle connecting rod can drive the movable contact mounting seat 1 to rotate, specifically, the end of the handle connecting rod is always placed in the curved portion 1111 by the action of the interference arm 22, so as to realize the operation of closing the circuit breaker, and when the lock catch 2 moves under the external force, the interference arm 22 of the lock catch 2 When the arm 22 leaves the upper part of the curved portion 1111 of the slide groove, that is, it loses the resistance to the handle connecting rod, the handle connecting rod slides into the straight portion 1112 under the action of the side wall of the curved portion 1111 of the slide groove and the handle, and the moving contact mounting seat 1 rotates to trip the circuit breaker, and the curved portion 1111 here is arranged upward on the side close to the handle, so that the rotation direction of the handle is completely opposite to that of the traditional circuit breaker, overcoming the problem that the original handle cannot achieve opening and closing in the opposite direction; the lock buckle 2 rotates with the arc-shaped convex column 114, and a gap will appear, and dust will enter the gap, and there will be no problem of adhesion and increased friction caused by dust, and the convex rib 115 is set to reduce friction; the L-pole moving contact 3 is very convenient to install in the above manner. In addition, the two arms of the first torsion spring 5 are very firmly fixed on the mounting seat, and can well limit the rotation range of the L-pole moving contact 3. At the same time, the L-pole moving contact 3 is closer to the static contact when closing, and will rotate first under high current conditions, which is conducive to rapid opening.

[0024] In the embodiment of the present invention, a connecting column 121 is provided above the mounting column 14 of the second side 12 of the moving contact mounting seat 1, and a convex edge 1211 is provided around the periphery of the connecting column 121, and a contact surface 12111 and a contact boss 12112 are respectively provided on the convex edge 1211, and a third torsion spring 6 is sleeved on the connecting column 121, and the first torsion arm of the third torsion spring 6 contacts the contact surface 12111, and the second torsion arm of the third torsion spring 6 can contact the contact boss 12112. Of course, a groove can also be provided on the contact boss 12112, and the third torsion spring 6 can also contact in the groove, and the contact boss A second stopper 121121 is provided below the platform 12112, and a positioning notch 121122 is formed between the second stopper 121121 and the side surface of the second side 12 of the moving contact mounting seat 1, a second bayonet 42 is provided on the N-pole moving contact 4, and a second concave cavity 16 is provided on the second side 12 of the moving contact mounting seat 1 and corresponding to the second bayonet 42, the N-pole moving contact 4 is sleeved on the mounting post 14 on the second side 12 of the moving contact mounting seat 1, and a second torsion spring 7 is provided between the N-pole moving contact 4 and the moving contact mounting seat 1, and the second torsion spring 7 is also sleeved on the mounting post 14 on the second side 12 of the moving contact mounting seat 1 4, the first torsion arm of the second torsion spring 7 abuts on the positioning notch 121122, the second torsion arm of the second torsion spring 7 abuts on the second bayonet 42 of the N-pole moving contact 4, and the second torsion arm end of the second torsion spring 7 is bent and inserted into the second concave cavity 16, a positioning protrusion 122 is provided on the second side 12 of the moving contact mounting seat 1, and an N limit block 41 is provided on the N-pole moving contact 4 and between the positioning protrusion 122 and the abutting boss 12112, and the abutment between the N limit block 41 and the positioning protrusion 122 or the abutting boss 12112 constitutes the rotation angle limit of the N-pole moving contact 4; in the above scheme, the N-pole The function of the moving contact 4 is basically the same as that of the L-pole moving contact, and the purpose is to better close or open the circuit breaker. In addition, the connecting column 121 is arranged in the above-mentioned manner, and a convex edge 1211 is arranged around it to protect the connecting column 121 very well. Even if the connecting column 121 is broken, it will not affect the function of the third torsion spring 6. The interference boss 12112 on the convex edge 1211 can make the second interference arm of the third torsion spring 6 temporarily interfere with the interference boss 12112. The purpose is to enable the second interference arm of the third torsion spring 6 to be clamped into the protrusion on the base through the bevel on the base when the circuit breaker base is installed, so as to realize mechanized installation.

[0025] In the embodiment of the present invention, the first torsion arm of the first torsion spring 5 is placed near the stopper 1121 of the limiting groove 1122, and the width of the space in which the limiting groove 1122 is located in the first torsion arm of the first torsion spring 5 is greater than the thickness of the L-pole moving contact 3. The L-pole moving contact 3 rotates its side of the positioning sheet 32 ​​to insert into the space in the first torsion arm of the limiting groove 1122, and the first torsion arm of the second torsion spring 7 is placed near the stopper 121121 of the positioning recess 121122, and the width of the space in which the positioning recess 121122 is located in the first torsion arm of the second torsion spring 7 The degree is greater than the thickness of the N-pole moving contact 4. When the N-pole moving contact 4 rotates, the side of its N-limit block 41 can be inserted into the positioning recess 121122 located in the space within the first torsion arm of the second torsion spring 7. In the above scheme, the limiting groove 1122 and the first torsion arm of the first torsion spring 5 are arranged using the above scheme, which can ensure that the range of movement of the positioning piece 32 is not affected. In addition, the rotation of the positioning piece 32 will not affect the torsion spring, and the two do not interfere with each other. Similarly, the positioning recess 121122, the second torsion spring 7 and the N-limit block 41 also have the same function.

[0026] In the embodiment of the present invention, a convex rib or groove 17 is provided on the circumferential surface of the moving contact mounting seat 1 and between the positioning piece 32 of the L-pole moving contact 3 and the limiting block 41 of the N-pole moving contact 4, the purpose of which is to increase the creepage distance. Since the positioning piece 32 and the limiting block 41 are relatively close at this position, it is not easy to burn the product; an arc isolation plate 23 and a convex piece 24 are provided below the lock buckle 2. The function of the arc isolation plate 23 is to isolate the arc, and the function of the convex piece 24 is to be pulled by the double metal pull rod. An arc-shaped contact surface 25 is provided on the lock buckle 2 at a position corresponding to the top rod of the circuit breaker releaser. The arc-shaped contact surface 25 is convenient for the lock buckle top rod to push the lock buckle 2, and a contact inclined surface 26 is provided on the lock buckle 2 and located above the mounting column 14.

[0027] In the embodiment of the present invention, a groove 1113 is provided around the bottom of the slide groove 111. The setting of the groove 1113 allows dust, impurities, etc. to enter without affecting the movement of the handle connecting rod. The lower side surface of the slide groove bending portion 1111 and the side surface of the corresponding position on the boss 112 are integrally arranged to form a pressing surface 1123. After the circuit breaker is closed, the connecting end of the circuit breaker handle connecting rod abuts against the pressing surface 1123, and the angle A between the thrust direction F1 of the circuit breaker handle on the connecting end of the handle connecting rod and the thrust direction F2 of the pressing surface 1123 on the connecting end of the handle connecting rod is less than 180 degrees. The moving contact mounting seat 1 is located above the slide groove 111 and is provided with an opening and closing indicator plate 13. By adopting the above scheme, the safety of the product is increased, wherein the upper limitation on the pressing surface 1123 is to satisfy the requirement that the pressing surface 1123 presses the handle link firmly when closing the circuit breaker, and to ensure that when the lock rotates to disengage the handle link, the end of the handle link can slide into the straight portion 1112 of the slide groove 111 to disconnect the circuit breaker. It should be noted here that the angle between the thrust direction of the handle on the connecting end of the handle link and the thrust direction of the pressing surface 1123 on the connecting end of the handle link is less than 180 degrees, so that the resultant force F3 generated by the two forces is upward. If the upper end of the handle link is blocked by the locking arm 22 of the locking arm 2, the end of the handle link is placed in the curved portion 1111 of the slide groove and does not move. If the locking arm 22 of the locking arm 2 above the end of the handle link leaves, the end of the handle link slides into the straight portion 1112 of the slide groove under the action of the upward force to disconnect the circuit breaker.

[0028] Finally, it should be noted that the terms of upper, lower, etc. described in this application document are based on the Figure 1 For view description.

Claims

1. A moving contact mechanism of a circuit breaker, comprising a moving contact mounting seat, a lock, an L-pole moving contact and an N-pole moving contact, wherein mounting posts are arranged on both sides of the moving contact mounting seat and are located on the same axis, the L-pole moving contact and the N-pole moving contact are movably arranged on the mounting posts on both sides of the moving contact mounting seat, the side of the moving contact mounting seat where the L-pole moving contact is mounted is a first side, and the side where the N-pole moving contact is mounted is a second side, Features: A slide groove is arranged above the first side of the moving contact mounting seat, and the slide groove has a curved portion and a straight portion, and the curved portion is curved upward on the side close to the circuit breaker handle, and a resisting arm is arranged on the lock buckle, and the resisting arm matches the slide groove to lock or release the handle connecting rod of the circuit breaker, and a boss is arranged around the straight portion of the slide groove, and a positioning block is arranged below the boss, and an arc-shaped boss is arranged around the bottom of the mounting column on the first side of the moving contact mounting seat, and a convex rib is arranged on the plane around the mounting column on the first side of the moving contact mounting seat, The lock buckle is provided with a mounting through hole, the mounting through hole of the lock buckle is sleeved on the mounting column on the first side and forms a rotational fit with the arc-shaped convex column, the L-pole moving contact is sleeved on the mounting column on the first side and its side surface contacts or is close to the end of the arc-shaped convex column, the L-pole moving contact is provided with a first bayonet, a concave cavity is provided on the moving contact mounting seat and corresponding to the first bayonet, a stopper is provided below the boss, a limiting groove is formed between the stopper and the side surface of the first side of the moving contact mounting seat, and a first stopper is provided between the L-pole moving contact and the moving contact mounting seat. A torsion spring, the first torsion spring is also sleeved on the mounting column on the first side, the first torsion arm of the first torsion spring is in contact with the limiting groove below the boss, the second torsion arm of the first torsion spring is in contact with the first bayonet of the L-pole moving contact, the end wall of the second torsion arm of the first torsion spring has a bending portion, and the bending portion is inserted into the concave cavity below the first bayonet, and a positioning piece is arranged on the L-pole moving contact, and the positioning piece is located between the positioning block and the boss of the moving contact mounting seat, and the contact between the positioning piece and the positioning block or the boss constitutes a limit to the rotation angle of the L-pole moving contact.

2. The moving contact mechanism of the circuit breaker according to claim 1, Features: A connecting column is arranged above the mounting column on the second side of the moving contact mounting seat, and a convex edge is arranged around the periphery of the connecting column, and a contact surface and a contact boss are respectively arranged on the convex edge, and a third torsion spring is sleeved on the connecting column, and the first torsion arm of the third torsion spring is in contact with the contact surface, and the second torsion arm of the third torsion spring can be in contact with the contact boss, and a second stopper is arranged below the contact boss, and a positioning recess is formed between the second stopper and the side surface of the second side of the moving contact mounting seat, a second bayonet is arranged on the N-pole moving contact, and a second concave cavity is arranged on the second side of the moving contact mounting seat and corresponding to the second bayonet, and the N-pole moving contact sleeve is arranged on the moving contact mounting seat. The second torsion spring is also sleeved on the mounting column on the second side of the moving contact mounting seat, the first torsion arm of the second torsion spring abuts on the positioning recess, the second torsion arm of the second torsion spring abuts on the second snap-on recess of the N-pole moving contact, and the end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity, a positioning protrusion is provided on the second side of the moving contact mounting seat, an N limit block is provided on the N-pole moving contact and between the positioning protrusion and the abutment protrusion, and the abutment of the N limit block with the positioning protrusion or the abutment protrusion constitutes a limit on the rotation angle of the N-pole moving contact.

3. The moving contact mechanism of the circuit breaker according to claim 2, Features: The first torsion arm of the first torsion spring is placed near the stop block of the limiting groove, and the width of the space of the limiting groove in the first torsion arm of the first torsion spring is greater than the thickness of the L-pole moving contact. The L-pole moving contact rotates its positioning piece side to be inserted into the space of the limiting groove in the first torsion arm. The first torsion arm of the second torsion spring is placed near the stop block of the positioning recess, and the width of the space of the positioning recess in the first torsion arm of the second torsion spring is greater than the thickness of the N-pole moving contact. The N-pole moving contact rotates its limiting block side to be inserted into the space of the positioning recess in the first torsion arm of the second torsion spring.

4. The moving contact mechanism of the circuit breaker according to claim 1 or 2, Features: A convex rib or a groove is arranged on the circumferential surface of the moving contact mounting seat and between the positioning piece of the L-pole moving contact and the N-limit block, a convex piece is arranged below the lock buckle, an arc-shaped contact surface is arranged on the lock buckle at a position corresponding to the top rod of the circuit breaker releaser, and a contact inclined surface is arranged on the lock buckle and above the mounting column.

5. The moving contact mechanism of the circuit breaker according to claim 1 or 2, Features: A groove is arranged around the bottom of the slide groove, and the lower side surface of the curved portion of the slide groove and the side surface at the corresponding position on the boss are integrally arranged to form a pressing surface. After the circuit breaker is closed, the connecting end of the circuit breaker handle connecting rod abuts against the pressing surface, and the angle between the thrust direction of the circuit breaker handle on the connecting end of the handle connecting rod and the thrust direction of the pressing surface on the connecting end of the handle connecting rod is less than 180 degrees. The moving contact mounting seat is provided with an opening and closing indicator plate above the slide groove.

6. The moving contact mechanism of the circuit breaker according to claim 4, Features: A groove is provided around the bottom of the chute. The lower side of the bending part of the chute is integrally provided with the side surface at the corresponding position on the convex platform to form a pressing surface. After the circuit breaker is closed, the connecting end of the circuit breaker handle link contacts the pressing surface, and the included angle between the thrust direction of the circuit breaker handle on the connecting end of the handle link and the thrust direction of the pressing surface on the connecting end of the handle link is less than 180 degrees. A closing and opening indicating board is arranged above the moving contact mounting seat in the chute.

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