Operating mechanism of molded case circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a molded case circuit breaker operating mechanism, which comprises a re-buckling piece, a locking piece and a re-buckling spring, the re-buckling piece is rotationally mounted through a re-buckling piece rotating shaft, and the re-buckling piece comprises a re-buckling part extending from the re-buckling piece rotating shaft to the locking piece; the locking piece is rotationally mounted through a locking piece rotating shaft, and the locking piece comprises a locking plate arranged opposite to the re-buckling part and an extension arm extending from the locking piece rotating shaft to the re-buckling piece; the re-buckling spring is provided with a first acting part acting on the re-buckling part and a second acting part acting on the extension arm; when the re-buckling part abuts against the lock catch plate through rotation of the re-buckling piece, the re-buckling spring is made to store energy through the first acting part. And when the locking plate is separated from the re-buckling part through the rotation of the locking piece, the re-buckling spring is enabled to store energy through the second acting part. In conclusion, the purpose of simplifying the structure is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an operating mechanism for a molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker (MCCB) is a circuit breaker that uses a plastic insulator as its housing. It is used to distribute electrical energy and protect circuits and power equipment from damage caused by overloads, short circuits, and other faults. As the application of MCBs becomes more widespread, there are increasingly higher requirements for their operational performance.

[0003] The operating mechanism of a molded case circuit breaker (MCCB) is a core component, used to achieve closing, opening, and various protection functions. In existing technology, when closing the MCCB, a structure consisting of a trip plate, re-clamping mechanism, locking mechanism, first torsion spring, and second torsion spring is used to achieve re-clamping and tripping. This complex overall structure and cumbersome assembly process during production hinders cost reduction in MCCB manufacturing. Utility Model Content

[0004] In view of this, in order to solve the problems mentioned in the background art, the purpose of this utility model is to provide an operating mechanism for a molded case circuit breaker.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An operating mechanism for a molded case circuit breaker includes a re-fastening element, a locking element, and a re-fastening spring;

[0007] The re-fastener is rotatably installed via a re-fastener pivot, and the re-fastener includes a re-fastening portion extending from the re-fastener pivot to the locking fastener;

[0008] The fastener is rotatably installed via a fastener pivot, and the fastener includes a fastener plate disposed opposite to the re-fastening part and an extension arm extending from the fastener pivot to the re-fastening part;

[0009] The re-locking spring has a first working part that acts on the re-locking part and a second working part that acts on the extension arm;

[0010] When the re-fastening part abuts against the locking plate by the rotation of the re-fastening member, the re-fastening spring is energized by the first actuating part; when the locking plate disengages from the re-fastening part by the rotation of the locking member, the re-fastening spring is energized by the second actuating part.

[0011] Preferably, the main body of the re-clamping spring is sleeved and installed on the locking member pivot, and the extension arm is connected to the locking plate through a connecting arm, the connecting arm including an arc-shaped part that is coaxially engaged with the locking member pivot.

[0012] Preferably, the locking component further includes a mounting arm extending parallel to the connecting arm, and the mounting arm has a shaft hole that mates with the rotating shaft of the locking component.

[0013] Preferably, the re-fastening part includes a re-fastening part base, one side of the re-fastening part base is provided with a re-fastening protrusion extending toward the locking member, and the other side of the re-fastening part base is provided with a receiving groove toward the rotating shaft of the re-fastening member, and the first actuating part is at least partially engaged in the receiving groove.

[0014] Preferably, the operating mechanism of the molded case circuit breaker further includes a rotatably mounted trip latch, the trip latch including a latch arm extending toward the latching member, and the latching plate having a first latching groove capable of engaging the latch arm and a second latching groove capable of engaging the re-latch portion.

[0015] Preferably, the jump buckle further includes a first linkage arm, and the locking member further includes a second linkage arm that cooperates with the first linkage arm. The first linkage arm acts on the second linkage arm through the rotation of the jump buckle, so as to drive the locking plate to change from a configuration of engaging with the re-fastening part to a configuration of engaging with the locking arm through the rotation of the locking member.

[0016] Preferably, the operating mechanism of the molded case circuit breaker further includes a mounting frame, and the trip buckle is rotatably connected to the mounting frame by a rivet structure. A first connecting part and a second connecting part are respectively provided on both sides of the mounting frame so that the opening of the mounting frame forms an annular structure, and an action space is formed between the trip buckle and the first connecting part to cooperate with the locking plate.

[0017] Preferably, the re-fastener further includes a limiting part extending parallel to the re-fastening part, and a first limiting platform and a second limiting platform are provided opposite to each other on one side of the mounting bracket, forming an action space that cooperates with the limiting part between the first limiting platform and the second limiting platform.

[0018] Preferably, the operating mechanism of the molded case circuit breaker further includes a swing arm mechanism connected to the moving contact and the trip latch drive to perform closing or opening actions; the mounting bracket has a tongue portion that cooperates with the rotating shaft of the moving contact. When closing, the re-fastening member unlocks the locking member, and the locking member locks the trip latch after it has been charged by the swing arm mechanism; when opening, the locking member remains locked to the trip latch or unlocks the trip latch; when the locking member unlocks the trip latch, the re-fastening member locks the locking member.

[0019] Preferably, the swing arm mechanism includes a swing arm, the mounting frame is provided with a convex cylinder and a positioning groove defined by an outwardly turned positioning flange structure, the swing arm is slidably engaged with the positioning groove, and the swing arm is also provided with an arc-shaped hinge groove that is rotatably engaged with the convex cylinder.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] (1) This utility model provides an operating mechanism for a molded case circuit breaker. By integrally forming the re-fastening part on the re-fastening part and by optimizing the structure of the re-fastening spring and the locking part, the number of parts is reduced. A single re-fastening spring is used to realize the dual-structure power storage of the re-fastening part and the locking part, thereby simplifying the overall structure of the operating mechanism of the molded case circuit breaker and making the production and assembly of the operating mechanism of the molded case circuit breaker more convenient.

[0022] (2) In this utility model, the re-fastening part of the re-fastening member is provided with a receiving groove that cooperates with the first working part of the re-fastening spring, and the locking member is provided with an extension arm that cooperates with the second working part of the re-fastening spring, thereby effectively improving the rationality and stability of the assembly of the re-fastening member, the locking member and the re-fastening spring.

[0023] (3) The mounting bracket increases the overall structural strength through the cooperation of the first connecting part and the second connecting part. At the same time, the first connecting part is used to position the locking fastener, and the first limiting platform and the second limiting platform are set to position the fastener, so that the overall structure is more reasonable.

[0024] (4) In this utility model, the mounting bracket is provided with a convex cylinder and a positioning groove that cooperate with the swing arm, thereby further improving the stability of the swing arm installation and operation; in addition, the handle on the swing arm is installed in a side-mounted manner, that is, the extension direction of the handle is perpendicular to the movement direction of the swing arm, to ensure that the swing arm mechanism is not easy to fall off when it moves.

[0025] (5) In this utility model, a tongue part that cooperates with the moving contact is added. The tongue part supports the moving contact at the pivot of the moving contact, which can effectively improve the structural stability of the moving contact and avoid the safety hazard of the existing moving contact protective cover falling off. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present utility model;

[0027] Figure 2 This is one of the structural schematic diagrams of the re-fastener, locking fastener, re-fastener spring and jump buckle in this utility model;

[0028] Figure 3 This is the second structural diagram of the cooperation between the re-fastener, locking fastener, re-fastening spring and jump buckle in this utility model;

[0029] Figure 4 This is one of the structural schematic diagrams of the fastener in this utility model;

[0030] Figure 5 This is the second structural schematic diagram of the fastener in this utility model;

[0031] Figure 6 This is a schematic diagram of the mounting bracket in this utility model;

[0032] Figure 7 This is one of the structural schematic diagrams of the assembly of the locking fastener and the re-locking spring in this utility model;

[0033] Figure 8 This is the second structural schematic diagram of the assembly of the locking fastener and the re-locking spring in this utility model;

[0034] In the diagram: Re-fastener-1; Re-fastener pivot-11; Re-fastener part-12; Re-fastener base-121; Receiving groove-122; Re-fastener protrusion-123; Limiting part-13; Locking fastener-2; Locking fastener pivot-21; Locking plate-22; First locking groove-221; Second locking groove-222; Extension arm-23; Connecting arm-24; Arc-shaped part-241; Mounting arm-25; Second linkage arm-26; Re-fastener spring-3; First action part-31; Second action part-32; Jumper buckle-4; Locking arm-41; First linkage arm-42; Mounting bracket-5; First connecting part-51; Second connecting part-52; First limiting platform-53; Second limiting platform-54; Convex cylinder-55; Positioning groove-56; Tongue-57; Swing arm mechanism-6; Swing arm-61; Arc-shaped hinge groove-62. Detailed Implementation

[0035] To further understand the content of this utility model, a detailed description of it is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art; they are not intended to limit the implementation of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to the embodiments of this application described herein.

[0036] like Figure 1As shown, the operating mechanism of a molded case circuit breaker provided by this utility model includes a re-fastening element 1, a locking element 2, a re-fastening spring 3, a trip latch 4, a mounting frame 5, a swing arm mechanism 6, and a moving contact system. Specifically, the re-fastening element 1 is rotatably mounted in the mounting frame 5 via a re-fastening element shaft 11, the locking element 2 is rotatably mounted in the mounting frame 5 via a locking element shaft 21, the re-fastening spring 3 stores rotational energy for the re-fastening element 1 and the locking element 2, the trip latch 4 is rotatably connected to the mounting frame 5 via a riveting structure (to effectively increase the rotational opening torque of the trip latch 4), and the swing arm mechanism 6 is driven and connected to the moving contact system and the trip latch 4 to perform closing or opening actions. The mounting frame 5 limits the opening torque of the moving contact of the moving contact system under the drive of the swing arm mechanism 6 to 29mm for performing closing or opening actions. It should be noted that when closing the circuit, the re-fastener 1 unlocks the locking fastener 2, and the locking fastener 2 locks the trip latch 4 after it has been driven and charged by the swing arm mechanism 6; when opening the circuit, the locking fastener 2 remains locked to the trip latch 4 or unlocks the trip latch 4; when the locking fastener 2 unlocks the trip latch 4, the re-fastener 1 locks the locking fastener 2.

[0037] For example, an improved embodiment of this utility model is: using a re-clamping spring 3 to realize the dual-structure force storage of the re-clamping member 1 and the locking member 2, thereby simplifying the overall structure of the molded case circuit breaker operating mechanism and making the production and assembly of the molded case circuit breaker operating mechanism more convenient.

[0038] In this embodiment, reference Figures 2-5 As shown:

[0039] The re-fastener 1 includes a re-fastening portion 12 extending from the re-fastener pivot 11 toward the locking fastener 2; the re-fastening portion 12 includes a re-fastening portion base 121, one side of the re-fastening portion base 121 is provided with a re-fastening protrusion 123 extending toward the locking fastener 2, and the other side of the re-fastening portion base 121 is provided with a receiving groove 122 facing the re-fastener pivot 11;

[0040] The locking fastener 2 includes a locking plate 22 disposed opposite to the re-fastening part 12, a second linkage arm 26 extending from the locking plate 22 toward the jump buckle 4, and an extension arm 23 and a mounting arm 25 extending in parallel from the locking plate 22 toward the re-fastener 1. The mounting arm 25 is provided with a shaft hole that cooperates with the locking fastener pivot 21, and the locking plate 22 is provided with a first locking groove 221 and a second locking groove 222.

[0041] The re-fastening spring 3 is preferably a torsion spring, comprising a main body and a first action part 31 and a second action part 32 connected to the main body. The torsion spring main body is sleeved and installed on the locking member pivot 21. The first action part 31 extends toward the re-fastening part 12 and is at least partially engaged in the receiving groove 122. The second action part 32 extends toward the extension arm 23 and abuts against the extension arm 23, thereby effectively improving the rationality and stability of the assembly structure of the re-fastening member 1, the locking member 2, and the re-fastening spring 3. Specifically, the torsion spring, based on its own elasticity, drives the first action part 31 and the second action part 32 away from each other. The first action part 31 is engaged in the receiving groove 122 to drive... Figure 2 and Figure 3 The re-fastener 1 in the structure shown has a clockwise rotation tendency, and the second actuating part 32 abuts against the upper end of the extension arm 23 to drive it. Figure 2 and Figure 3 The locking element 2 in the structure shown has a clockwise rotation tendency;

[0042] The jump buckle 4 includes a buckle arm 41 and a first linkage arm 42 extending toward the buckle member 2.

[0043] In summary, combining Figure 2 and Figure 3 The structure shown is as follows: The current structure is the locking buckle 2 locking the jump buckle 4. In this state, the locking arm 41 is engaged in the first locking groove 221, and the re-fastening protrusion 123 abuts against the right side surface of the locking plate 22.

[0044] When the jump buckle 4 needs to be unlocked, press the re-fastening member 1 to the left, causing the re-fastening member 1 to rotate counterclockwise. At the same time, the re-fastening part 12 presses down on the first action part 31 to allow the re-fastening spring 3 to store energy. During this process, the re-fastening part 12 pushes the locking plate 22, causing the locking plate 22 to rotate slightly counterclockwise until the re-fastening part 12 swings to the position corresponding to the second locking groove 222. Then, the entire locking member 2 rotates clockwise to reset under the pushing and rebounding action of the second action part 32, thereby causing the locking arm 41 to disengage from the first locking groove 221 and the re-fastening part 12 to engage in the second locking groove 222. This completes the unlocking of the jump buckle 4 and the limiting of the locking plate 22. That is, the locking plate 22 changes from a configuration that engages with the locking arm 41 to a configuration that engages with the re-fastening part 12 through the rotation of the locking member 2.

[0045] When the trip latch 4 needs to be locked, it rotates clockwise to the right under the drive of the swing arm mechanism 6. At this time, the locking arm 41 is inserted into the first locking groove 221, and the first linkage arm 42 acts on the top of the second linkage arm 26, thereby pressing down the second linkage arm 26 to drive the locking member 2 to rotate counterclockwise. The extension arm 23 pushes up the second action part 32 to store energy in the re-locking spring 3. During this process, the locking plate 22 presses down on the re-locking part 12 through the second locking groove 222, causing the re-locking member 1 to generate energy. A slight counterclockwise rotation occurs until the re-fastening part 12 disengages from the second locking groove 222. Then, under the pushing and rebounding action of the first actuating part 31, the re-fastening member 1 rotates clockwise to reset. Afterward, the swing arm mechanism 6 is released, and the locking member 2 partially rotates clockwise to reset under the pushing and rebounding action of the second actuating part 32, until the right side surface of the locking plate 22 abuts against the re-fastening protrusion 123. This limits the positioning position of the locking member 2 and ensures that the locking arm 41 remains engaged within the first locking groove 221, thus forming... Figure 2 and Figure 3 The shown locking fastener 2 locks the jump buckle 4 in a structural state, so that the locking plate 22 changes from a configuration that engages with the re-fastening part 12 to a configuration that engages with the locking arm 41 through the rotation of the locking fastener 2.

[0046] It should be noted that the jump buckle 4 also includes a limiting arm extending toward the locking member 2. The limiting arm limits the position of the locking member 2 to prevent the locking member 2 from swinging when it is not touched, thereby effectively avoiding the occurrence of accidental re-fastening.

[0047] To further improve the rationality of the assembly between the extension arm 23 and the re-clamping spring 3, this utility model provides the following... Figure 7 and Figure 8 The two assembly methods shown are:

[0048] Assembly method one, such as Figure 7 As shown, the extension arm 23 is a straight arm integrally formed with the locking plate 22, and the extension arm 23 is fitted above the locking member pivot 21;

[0049] Assembly method two, such as Figure 8 As shown, the extension arm 23 is connected to the locking plate 22 via the connecting arm 24. The connecting arm 24 is provided with an arc-shaped part 241 that is coaxially engaged with the locking member pivot 21. The arc-shaped part 241 passes under the locking member pivot 21.

[0050] To further improve the structural stability of the re-fastener 1 under different snap-fit ​​configurations, such as Figure 4 The re-fastener 1 shown also includes a limiting portion 13 extending parallel to the re-fastening portion 12, such as... Figure 6As shown, a first limiting platform 53 and a second limiting platform 54 are provided opposite to each other on one side of the mounting bracket 5. An action space is formed between the first limiting platform 53 and the second limiting platform 54 to cooperate with the limiting part 13. This action space is preferably 15mm to improve the reliability of the instantaneous extension action of the overall operating mechanism. Specifically, in combination with Figure 1 As shown in the assembly structure, when the re-fastener 1 is rotatably mounted on the mounting bracket 5 via the re-fastener pivot 11, the limiting part 13 is just inserted into the movement space between the first limiting platform 53 and the second limiting platform 54. The first limiting platform 53 is positioned above the limiting part 13, and the second limiting platform 54 is positioned below the limiting part 13, thereby effectively limiting the swing amplitude of the re-fastener 1. It should be noted that the limiting part 13 is configured according to... Figure 1 When the structure shown abuts against the first limiting platform 53, that is, when the re-fastener 1 is pushed and springbacked by the first actuating part 31, it rotates clockwise to reset to its original position. Figure 2 and Figure 3 The structural state shown ensures that the re-fastening protrusion 123 can stably abut against the locking plate 22.

[0051] To further improve the structural stability of the locking element 2 under different snap-fit ​​configurations, such as Figure 6 A first connecting portion 51 is provided on one side of the mounting bracket 5, thereby forming an action space between the jump buckle 4 and the first connecting portion 51 to cooperate with the locking plate 22. This action space is preferably 15mm, so that the disengagement force between the jump buckle 4 and the locking plate 22 is reduced by 1.5N. Specifically, combined with... Figure 1 As shown in the assembly structure, when the locking member 2 is rotatably mounted on the mounting bracket 5 via the locking member pivot 21, the upper part of the locking plate 22 is just inserted into the action space between the jump buckle 4 and the first connecting part 51. The first connecting part 51 is limited to the right side of the locking plate 22, and the jump buckle 4 is limited to the left side of the locking plate 22, thereby effectively limiting the swing amplitude of the locking member 2. It should be noted that when unlocking the jump buckle 4, the entire locking member 2 rotates clockwise to reset under the downward push and rebound action of the second action part 32. That is, the locking plate 22 swings clockwise to the right and abuts against the first connecting part 51. Combined with the limitation of the limiting part 13 by the first limiting platform 53, this effectively ensures the engagement of the re-locking protrusion 123 with the second locking groove 222, thereby stably realizing the re-locking of the locking member 2.

[0052] Furthermore, it is worth noting that the mounting frame 5 is also provided with a second connecting part 52 on the other side, which is arranged opposite to the first connecting part 51. This makes the entire mounting frame 5 form a closed frame structure, that is, the openings on each side of the mounting frame 5 form a ring structure. Compared with the traditional U-shaped frame, while meeting the above-mentioned requirements of the locking member 2, it also effectively improves the structural strength of the entire mounting frame 5, making the structural design of the operating mechanism of the molded case circuit breaker of this utility model more reasonable.

[0053] For example, another improved embodiment of this utility model is as follows: the swing arm mechanism 6 includes a swing arm 61 and a handle connected to the swing arm 61. Specifically, the handle is mounted on the swing arm 61 in a side-mounted manner, that is, the extension direction of the handle is perpendicular to the movement direction of the swing arm 61, ensuring that the swing arm mechanism 6 is not prone to disengagement during operation; the mounting bracket 5 is provided with a convex cylinder 55 and a positioning groove 56 defined by an outwardly turned positioning flange structure, the swing arm 61 is slidably engaged with the positioning groove 56, and the swing arm 61 is also provided with an arc-shaped hinge groove 62 that rotatably engages with the convex cylinder 55, thereby making the rotation operation of the swing arm 61 smoother and more stable; wherein, the diameter of the convex cylinder 55 is preferably 12mm.

[0054] Furthermore, the operating mechanism of this molded case circuit breaker also includes a tongue 57 inside the mounting frame 5 that cooperates with the moving contact system, such as... Figure 1 As shown, the tongue portion 57 provides support to the moving contact at the pivot point of the moving contact, which can effectively improve the structural stability of the moving contact.

[0055] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An operating mechanism for a molded case circuit breaker, characterized in that: Includes a re-fastener (1), a locking fastener (2), and a re-fastening spring (3); The re-fastener (1) is rotatably installed via a re-fastener pivot (11), and the re-fastener (1) includes a re-fastening portion (12) extending from the re-fastener pivot (11) toward the locking member (2). The locking member (2) is rotatably installed via the locking member pivot (21). The locking member (2) includes a locking plate (22) disposed opposite to the re-fastening part (12) and an extension arm (23) extending from the locking member pivot (21) toward the re-fastening member (1). The re-locking spring (3) has a first action portion (31) acting on the re-locking part (12) and a second action portion (32) acting on the extension arm (23). When the re-fastening part (12) abuts against the locking plate (22) by the rotation of the re-fastening member (1), the re-fastening spring (3) stores energy through the first action part (31); when the locking plate (22) disengages from the re-fastening part (12) by the rotation of the locking member (2), the re-fastening spring (3) stores energy through the second action part (32).

2. The operating mechanism for a molded case circuit breaker according to claim 1, characterized in that: The main body of the re-clamping spring (3) is sleeved and installed on the locking member pivot (21). The extension arm (23) is connected to the locking plate (22) through the connecting arm (24). The connecting arm (24) includes an arc-shaped part (241) that is coaxially engaged with the locking member pivot (21).

3. The operating mechanism for a molded case circuit breaker according to claim 2, characterized in that: The locking member (2) also includes a mounting arm (25) extending parallel to the connecting arm (24), and the mounting arm (25) is provided with a shaft hole that cooperates with the locking member pivot (21).

4. The operating mechanism for a molded case circuit breaker according to claim 1, characterized in that: The re-fastening part (12) includes a re-fastening part base (121), one side of which is provided with a re-fastening protrusion (123) extending toward the locking member (2), and the other side of which is provided with a receiving groove (122) facing the re-fastening member pivot (11), and the first actuating part (31) is at least partially engaged in the receiving groove (122).

5. The operating mechanism for a molded case circuit breaker according to claim 1, characterized in that: It also includes a rotatably mounted jump buckle (4), which includes a buckle arm (41) extending toward the locking member (2), and the locking plate (22) is provided with a first locking groove (221) that can engage the locking arm (41) and a second locking groove (222) that can engage the re-locking part (12).

6. The operating mechanism for a molded case circuit breaker according to claim 5, characterized in that: The jump buckle (4) also includes a first linkage arm (42), and the locking member (2) also includes a second linkage arm (26) that cooperates with the first linkage arm (42). The first linkage arm (42) is used by the rotation of the jump buckle (4) to the second linkage arm (26) to drive the locking plate (22) to change from a snap-fit ​​configuration with the re-fastening part (12) to a snap-fit ​​configuration with the locking arm (41) through the rotation of the locking member (2).

7. The operating mechanism for a molded case circuit breaker according to claim 5, characterized in that: It also includes a mounting bracket (5), the jump buckle (4) is rotatably connected to the mounting bracket (5) by a rivet structure, and a first connecting part (51) and a second connecting part (52) are respectively provided on both sides of the mounting bracket (5) so that the opening of the mounting bracket (5) forms a ring structure, and an action space that cooperates with the locking plate (22) is formed between the jump buckle (4) and the first connecting part (51).

8. The operating mechanism for a molded case circuit breaker according to claim 7, characterized in that: The re-fastener (1) also includes a limiting part (13) extending parallel to the re-fastener (12). The mounting bracket (5) has a first limiting platform (53) and a second limiting platform (54) on one side, and an action space that cooperates with the limiting part (13) is formed between the first limiting platform (53) and the second limiting platform (54).

9. The operating mechanism for a molded case circuit breaker according to claim 7, characterized in that: It also includes a swing arm mechanism (6), which is driven and connected to the moving contact and the trip button (4) to perform closing or opening actions; the mounting bracket (5) is provided with a tongue part (57) that cooperates with the rotating shaft of the moving contact. When the circuit is closed, the re-fastener (1) unlocks the locking fastener (2), and the locking fastener (2) locks the trip fastener (4) after it has been driven and charged by the swing arm mechanism (6). When the circuit breaker is tripped, the locking member (2) remains locked to the trip latch (4) or the trip latch (4) is unlocked; when the locking member (2) unlocks the trip latch (4), the re-fastener (1) locks the locking member (2).

10. The operating mechanism of a molded case circuit breaker according to claim 9, characterized in that: The swing arm mechanism (6) includes a swing arm (61), the mounting frame (5) is provided with a convex cylinder (55) and a positioning groove (56) defined by an outwardly turned positioning flange structure, the swing arm (61) slides in cooperation with the positioning groove (56), and the swing arm (61) is also provided with an arc-shaped hinge groove (62) that rotates in cooperation with the convex cylinder (55).

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