Moving contact assembly and molded case circuit breaker

Abstract

The moving contact assembly comprises a moving contact and a connecting plate, one end of the moving contact is a contact portion used for being matched with the static contact, a moving contact installation portion at the other end of the moving contact is installed on the connecting plate in a pivoted mode, the moving contact assembly further comprises a conductive gasket, and the pivoting installation portion between the moving contact and the connecting plate is connected through the conductive gasket. And the conductive gasket is in sliding fit with the moving contact. According to the moving contact assembly and the molded case circuit breaker, the pivoting installation part between the moving contact and the connecting plate is connected through the conductive gasket, so that the sliding hard connection between the moving contact and the connecting plate is realized, the contact area is reduced under the condition that the resistance value of the moving contact assembly is not influenced, the rotating friction force between the connecting plate and the moving contact is reduced, and the service life of the moving contact assembly is prolonged. Therefore, the moving contact rotates more smoothly, and the operating force of the product is smaller.

Description

Technical Field

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

[0002] Existing switchgear, such as the moving contact assembly structure in molded case circuit breakers, mostly has direct contact between the connecting plate and the moving contact, which is a hard-connected structure. The moving contact encounters large friction resistance when rotating, which increases the operating force of the molded case circuit breaker. At the same time, when the circuit breaker is opened and closed, the rotation speed of the moving contact will also be affected, thereby affecting the opening and closing performance of the circuit breaker. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide a moving contact assembly and a molded case circuit breaker.

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

[0005] The moving contact assembly includes a moving contact and a connecting plate, wherein one end of the moving contact is a contact portion for cooperating with a stationary contact, and a moving contact mounting portion at the other end of the moving contact is pivotally mounted on the connecting plate. The moving contact assembly also includes a conductive gasket, and the pivotally mounted portion between the moving contact and the connecting plate is connected via the conductive gasket, and the conductive gasket is slidably matched with the moving contact.

[0006] Preferably, one side surface of the conductive gasket is in contact with the connecting plate, and the other side surface of the conductive gasket is a convex surface, and the moving contact is provided with a curved groove that slidably cooperates with the convex surface.

[0007] Preferably, the pivotal mounting portion between the moving contact and the connecting plate includes a moving contact mounting portion and two connecting plate mounting portions, a contact shaft is arranged between the two connecting plate mounting portions, the moving contact mounting portion is pivotally mounted on the contact shaft and is located between the two connecting plate mounting portions, and a conductive gasket is respectively arranged on both sides of the moving contact mounting portion and between the two connecting plate mounting portions.

[0008] Preferably, it also includes a contact support, the operating mechanism drives the moving contact through the contact support, the pivotal mounting portion between the moving contact and the connecting plate is limited to the accommodating groove of the contact support, and the contact support and the moving contact are pivotally mounted on the same contact shaft.

[0009] Preferably, it also includes a compression spring, and the pivotal mounting part between the moving contact and the connecting plate is limited in the accommodating groove of the contact support by the compression spring. The compression spring is sleeved on the contact shaft and pre-tightened between the pivotal mounting part and the wall of the accommodating groove.

[0010] Preferably, it also includes a contact torsion spring, which is sleeved on the contact shaft, has one end connected to the accommodating groove of the contact support, and the other end connected to the contact portion of the moving contact.

[0011] Preferably, both ends of the contact shaft are respectively inserted into two fixed sleeves.

[0012] Preferably, it also includes an insulating tail wing, one end of which is wrapped around the connection between the contact portion of the moving contact and the moving contact mounting portion, and the arc-isolating portion at the other end is spaced apart from the contact support; the arc-isolating portion of the insulating tail wing is used to slide with the second arc groove of the unit housing.

[0013] Preferably, the contact support is provided with a transmission shaft for driving connection with the operating mechanism; and the outer walls on both sides of the contact support are provided with an annular groove surrounding the contact shaft and at least one first arc-shaped rib surrounding the transmission shaft.

[0014] Preferably, an arc isolation sheet is provided on the outer sides of both sides of the contact support.

[0015] Preferably, the contact support comprises a contact support connecting portion and two symmetrically arranged contact support mounting portions, and the contact support connecting portion is connected between the two contact support mounting portions to form the accommodating groove.

[0016] A molded case circuit breaker comprises an operating mechanism and a moving contact assembly of any one of the above technical solutions, wherein the operating mechanism drives the moving contact of the moving contact assembly to rotate on a connecting plate, so that the moving contact is disconnected or closed with a static contact.

[0017] Preferably, the operating mechanism includes a linkage rod, a bracket, a rocker assembly, a trip latch, a lock latch and a re-latch pivotally arranged on the bracket respectively, a main spring arranged between the rocker assembly and the linkage rod, and a first crank pivotally arranged on the trip latch and limitedly matched with the trip latch and the linkage rod, and the linkage rod is linked with the moving contact; when opening / closing the switch, the rocker assembly is rotated, and the linkage rod is driven by the main spring, and the linkage rod drives the moving contact to rotate, so that the moving contact and the static contact are opened and closed, and the linkage rod simultaneously drives the trip latch through the first crank, and the trip latch and the lock latch remain in a locked state, and the lock latch also remains in a locked state with the re-latch; when tripping, the re-latch rotates to unlock with the lock latch, and the lock latch rotates to unlock with the trip latch, driving the trip latch to rotate, driving the linkage rod to rotate the moving contact in linkage with the moving contact, so that the moving contact and the static contact are disconnected.

[0018] In the movable contact assembly and the molded case circuit breaker of the utility model, the pivotal mounting part between the movable contact and the connecting plate is connected by a conductive gasket to realize a sliding hard connection between the movable contact and the connecting plate. Without affecting the resistance value of the movable contact assembly, the contact area is reduced, the rotational friction between the connecting plate and the movable contact is reduced, the movable contact rotates more smoothly, and the product operating force is smaller.

[0019] In addition, the sliding structure between the conductive gasket and the moving contact adopts a sliding-fitting convex surface and a curved groove, which has a simple structure and arc-shaped contact that effectively reduces rotational friction and makes rotation more flexible. In addition, the smaller the friction, the smaller the wear, which increases the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the movable contact assembly and the unit housing of the utility model;

[0021] Figure 2 It is an assembly drawing of the movable contact assembly of the utility model;

[0022] Figure 3 It is an exploded view of the movable contact assembly of the utility model;

[0023] Figure 4 It is a schematic diagram of the structure of the contact support of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the unit housing of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the movable contact and the insulating tail wing of the utility model;

[0026] Figure 7 It is a three-dimensional diagram of the operating mechanism and two contact units of the utility model;

[0027] Figure 8 It is a schematic diagram of the operating mechanism of the utility model and the contact unit with half of the shell hidden;

[0028] Fig. 9 It is a partial structural schematic diagram of the operating mechanism and contact unit of the utility model;

[0029] Moving contact assembly 10; connecting plate 11; connecting plate mounting portion 11a; connecting plate wiring portion 11b; compression spring 110; conductive gasket 12; convex curved surface 12a; moving contact 13; contact torsion spring 130; contact portion 13a; moving contact mounting portion 13b; curved groove 13c; torsion spring limiting groove 13d; contact shaft 14; sleeve 140; insulating tail 15; arc-isolating portion 15a; rivet 150; contact support 16; transmission shaft 160; contact support connecting portion 16a; contact support mounting portion 16b; accommodating groove 16c; annular groove 16d; first arc-shaped convex rib 16e; first arc-shaped groove 16f; annular protrusion 16g; arc-isolating sheet 17; second arc-isolating The escape hole 17a; the static contact 18; the unit housing 19; the second arc groove 19a; the second arc convex rib 19b; the first avoidance hole 19c; the first push rod 21; the first push rod shaft 22; the first push rod spring 23; the second push rod 24; the third push rod 25; the third push rod spring 26; the linkage rod 30; the main spring 31; the bracket 40; the rocker arm assembly 50; the handle 51; the rocker arm 52; the rocker arm shaft 521; the lock 60; the lock shaft 61; the lock spring 62; the jump lock 70; the first crank 71; the jump lock shaft 72; the re-lock 80; the re-lock shaft 81; the re-lock spring 82; the transmission assembly 90; the first connecting rod 91; the second connecting rod 92; the second crank 93. DETAILED DESCRIPTION

[0030] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the movable contact assembly and the molded case circuit breaker of the present utility model. The movable contact assembly and the molded case circuit breaker of the present utility model are not limited to the description of the following embodiments.

[0031] like Figure 1 As shown, the molded case circuit breaker of this embodiment includes an operating mechanism and a contact unit. The contact unit includes a unit housing 19, a stationary contact 18 installed in the unit housing 19, and a moving contact assembly 10. In this embodiment, the unit housing 19 is formed by buckling two half shells.

[0032] like Figure 2-3 As shown, the movable contact assembly 10 of this embodiment includes a movable contact 13 and a connecting plate 11, one end of the movable contact 13 is a contact portion 13a for cooperating with the stationary contact 18, and the movable contact mounting portion 13b at the other end of the movable contact 13 is pivotally mounted on the connecting plate 11, and the operating mechanism drives the movable contact 13 to rotate on the connecting plate 11, so that the movable contact 13 is disconnected or closed with the stationary contact 18. In particular, the movable contact assembly 10 also includes a conductive gasket 12, and the pivotal mounting portion between the movable contact 13 and the connecting plate 11 is connected through the conductive gasket 12, and the conductive gasket 12 is slidably matched with the movable contact 13.

[0033] The contact unit of this embodiment serves as a phase pole of the molded case circuit breaker, and it can be set to several. The moving contacts 13 of several contact units can be driven simultaneously by a single operating mechanism. Preferably, three contact units are set, and the three contact units are arranged side by side, which can be connected to three-phase electricity; of course, it can also be one, two, four or more. The moving contact 13 of this embodiment is electrically connected to the connecting plate 11, and the static contact 18 can be set on the wiring board. The contact unit is connected to the wiring board through the connecting plate 11. An arc extinguishing chamber is also provided in the unit housing 19 of this embodiment, which is used to extinguish the arc generated during the opening and closing of the moving contact 13 and the static contact 18.

[0034] In the movable contact assembly and molded case circuit breaker of this embodiment, the pivotal mounting portion between the movable contact 13 and the connecting plate 11 is connected by a conductive gasket 12 to realize a sliding hard connection between the movable contact 13 and the connecting plate 11, which reduces the contact area without affecting the resistance value of the movable contact assembly 10, reduces the rotational friction between the connecting plate 11 and the movable contact 13, makes the movable contact 13 rotate more smoothly, and reduces the product operation force. The movable contact assembly of this embodiment is suitable for molded case circuit breakers, and of course, it is also suitable for other switch devices in which a hard connection structure is adopted between the movable contact and the wiring component.

[0035] like Figure 3 As shown, the sliding structure between the conductive gasket 12 and the moving contact 13 of this embodiment, one side of the conductive gasket 12 is in contact with the connecting plate 11, the other side of the conductive gasket 12 is a convex surface 12a, and the moving contact 13 is provided with a curved groove 13c that slides with the convex surface 12a. The sliding structure between the conductive gasket 12 and the moving contact 13 of this embodiment adopts the convex surface 12a and the curved groove 13c that slide with each other, the structure is simple, and the arc contact effectively reduces the rotational friction force, making the rotation more flexible; in addition, the smaller the friction force, the smaller the wear, and the service life is improved. Of course, the sliding structure between the conductive gasket 12 and the moving contact 13 can also adopt a sliding matching structure such as a convex point and a groove.

[0036] like Figure 2-3As shown, the pivotal mounting portion between the moving contact 13 and the connecting plate 11 includes a moving contact mounting portion 13b and two connecting plate mounting portions 11a, a contact shaft 14 is arranged between the two connecting plate mounting portions 11a, the moving contact mounting portion 13b is pivotally mounted on the contact shaft 14 and is located between the two connecting plate mounting portions 11a, and a conductive gasket 12 is respectively arranged between the two sides of the moving contact mounting portion 13b and the two connecting plate mounting portions 11a. The connecting plate 11 is fixed and limitedly mounted in the unit housing 19; the moving contact 13 can rotate around the contact shaft 14. Specifically, the connecting plate 11 is an integrally formed structure, specifically a convex-shaped plate with an open top, the top of the convex-shaped plate extends to one side to form the two connecting plate mounting portions 11a, and the bottom end plate of the convex-shaped plate extends to the other side to form a connecting plate wiring portion 11b for wiring. The two connecting plate mounting portions 11 a and the moving contact mounting portion 13 b are provided with contact shaft holes matched with the contact shaft 14 , and the contact shaft 14 passes through the contact shaft holes of the two connecting plate mounting portions 11 a .

[0037] like Figure 1-4 As shown, the movable contact assembly 10 of this embodiment further includes a contact support 16, and the operating mechanism drives the movable contact 13 through the contact support 16. The contact support 16 is provided with a transmission shaft 160 for driving and connecting with the operating mechanism. The pivoting installation part between the movable contact 13 and the connecting plate 11 is limited in the receiving groove 16c of the contact support 16. The contact support 16 and the movable contact 13 are pivotally installed on the same contact shaft 14. The operating mechanism drives the contact support 16 through the transmission shaft 160, so that the contact support 16 and the movable contact 13 rotate around the contact shaft 14. Figure 6 As shown, the transmission shaft 160 passes through the contact support 16 and the unit housing 19, so that multiple contact units can share the same transmission shaft 160, and the two sides of the unit housing 19 are provided with first avoidance holes 19c for avoiding the transmission shaft 160. Specifically, as Figure 4 As shown, the contact support 16 includes a contact support connecting portion 16a and two symmetrically arranged contact support mounting portions 16b, the contact support connecting portion 16a is connected between the two contact support mounting portions 16b to form the accommodating groove 16c, the contact support mounting portion 16b is similar to a bow-shaped plate structure, and its top surface is a curved surface, and the moving contact mounting portion 13b is similar to a circular plate structure.

[0038] Further, such as Figure 2-3As shown, the movable contact assembly 10 of this embodiment further includes a compression spring 110, and the pivotal mounting portion between the movable contact 13 and the coupling plate 11 is limited in the receiving groove 16c of the contact support 16 by the compression spring 110, and the compression spring 110 is sleeved on the contact shaft 14 and pre-tightened between the pivotal mounting portion and the wall of the receiving groove 16c. Specifically, two compression springs 110 are provided, and one compression spring 110 is provided between a single coupling plate mounting portion 11a and a corresponding contact support mounting portion 16b. The moving contact 13, the conductive gasket 12, the connecting plate 11, the compression spring 110 and the contact support 16 are connected together through the contact shaft 14. The compression spring 110 is compressed to provide a clamping force, so that the connecting plate 11, the conductive gasket 12 and the moving contact 13 are clamped, thereby increasing the contact pressure among the moving contact 13, the conductive gasket 12 and the connecting plate 11, improving the electrical contact reliability, and adopting an elastic limiting structure so as not to affect the rotation of the moving contact 13. Of course, other elastic members may be used instead of the compression spring.

[0039] like Figure 2-3 As shown, the movable contact assembly 10 of this embodiment also includes a contact torsion spring 130, which is sleeved on the contact shaft 14, one end of which is connected to the receiving groove 16c of the contact support 16, and the other end is connected to the contact portion 13a of the movable contact 13. Specifically, the contact torsion spring 130 has two spring bodies, which are respectively sleeved on the two compression springs 110 on the contact shaft 14, and the straight sections at one end of the two spring bodies are respectively abutted on both sides of the contact support connection portion 16a, and the other ends of the two spring bodies are connected by a U-shaped section, and the U-shaped section is inserted into the torsion spring limiting groove 13d on the contact portion 13a. The contact torsion spring 130 provides torque for the movable contact 13, so that the movable contact 13 generates pressure, thereby improving the contact reliability between the movable contact 13 and the static contact 18.

[0040] like Figure 1 and Figure 6 As shown, the two contact support mounting parts 16b of the contact support 16 are also provided with contact shaft holes that match the contact shaft 14. The contact shaft 14 passes through the contact support 16 and the pivot mounting part between the moving contact 13 and the connecting plate 11. The two ends of the contact shaft 14 are respectively inserted into two fixed shaft sleeves 140 and can rotate flexibly. The two sides of the unit housing 19 are provided with fixing grooves that are interference-fitted with the shaft sleeves 140. The shaft sleeves 140 are inserted into the fixing grooves of the unit housing 19 to achieve fixation. In this way, the metal contact shaft 14 and the fixing grooves on the plastic unit housing 19 are directly matched and rotated, which is converted into the contact shaft 14 rotating in the copper shaft sleeve 140, reducing the wear of the fixing groove and reducing the influence on the rotation concentricity of the moving contact assembly 10.

[0041] like Figure 1-3As shown, an arc isolation plate 17 is provided on the outer side of each side of the contact support 16. The arc isolation plate 17 can prevent arc particles from being ejected from between the unit housing 19 and the contact support 16. The arc isolation plate 17 is provided with a second avoidance hole 17a for avoiding the transmission shaft 160.

[0042] like Figure 3-4 The outer walls on both sides of the contact support 16 are provided with an annular groove 16d surrounding the contact shaft 14 and at least one first arc-shaped rib 16e surrounding the transmission shaft 160. The contact support 16 is provided with a plurality of first arc-shaped grooves 16f, which are arranged at intervals, and the first arc-shaped rib 16e is formed between two adjacent first arc-shaped grooves 16f, so that the side of the contact support 16 is flat to cover the arc isolation sheet 17. The annular groove 16d and the first arc-shaped rib 16e are provided to increase the creepage distance and electrical clearance between the contact shaft 14 and the transmission shaft 160. The outer walls on both sides of the contact support 16 are provided with an annular protrusion 16g surrounding the first push rod shaft 22 to ensure the insulation performance of the product.

[0043] like Figure 5-6 As shown, the moving contact assembly 10 of this embodiment also includes an insulating tail wing 15, one end of the insulating tail wing 15 is wrapped around the connection between the contact portion 13a and the moving contact mounting portion 13b of the moving contact 13, and the arc-isolating portion 15a at the other end is spaced apart from the contact support 16; a second arc-shaped groove 19a is provided on each side of the unit housing 19, and the arc-isolating portion 15a of the insulating tail wing 15 can slide in the second arc-shaped groove 19a, and the second arc-shaped groove 19a is formed by two second arc-shaped ribs 19b. The insulating tail 15 is an integrally formed structure made of insulating materials such as plastic. One end of the insulating tail 15 is a block structure, and the arc-isolating portion 15a at the other end is an arc-shaped sheet. The block structure is provided with a wrapping groove for wrapping the contact portion 13a of the moving contact 13, and a part of the block structure is placed in the receiving groove 16c of the contact support 16 and a convex structure is provided between the block structure and the contact support 16 to prevent the insulating tail 15 from escaping from the receiving groove 16c. The other part of the block structure is connected to the arc-isolating portion 15a outside the receiving groove 16c and is fixedly connected to the contact portion 13a of the moving contact 13 by a rivet 150. The insulating tail 15 cooperates with the second arc-shaped convex rib 19b of the unit housing 19 to block between the contact portion 13a of the moving contact 13 and the contact support 16. When the moving contact 13 is opened during disconnection, the insulating tail 15 blocks a large amount of arc particles from spraying back into the contact support 16.

[0044] like Figure 7-9As shown, the operating mechanism of this embodiment includes a linkage rod 30, a bracket 40, a rocker assembly 50, a trip button 70, a lock button 60 and a re-lock button 80 pivotally arranged on the bracket 40, respectively, a main spring 31 arranged between the rocker assembly 50 and the linkage rod 30, and a first crank 71 pivotally arranged on the trip button 70 and limitedly matched with the trip button 70 and the linkage rod 30. The linkage rod 30 is linked with the moving contact 13 through the transmission assembly 90; when opening / closing, the rocker assembly 50 is rotated, and the linkage rod 30 is driven by the main spring 31. The linkage rod 30 drives the moving contact 13 to rotate through the transmission assembly 90, so that the moving contact 13 and the static contact 18 are opened and closed, and the linkage rod 30 is simultaneously moved through the first The crank 71 drives the tripping latch 70, and the tripping latch 70 and the lock latch 60 remain in a locked state, and the lock latch 60 also remains in a locked state with the re-latch 80; when tripping, the re-latch 80 rotates around the re-latch rotating shaft 81 to be unlocked with the lock latch 60, and the lock latch 60 rotates around the lock rotating shaft 61 to be unlocked with the tripping latch 70, driving the tripping latch 70 to rotate around the tripping latch rotating shaft 72, driving the linkage rod 30 to rotate the linkage moving contact 13, so that the moving contact 13 is disconnected from the static contact 18; when buckling again, the rocker arm assembly 50 is rotated to drive the tripping latch 70 to reset, and the lock latch 60 rotates and resets to be locked with the tripping latch 70 under the action of the lock latch spring 62, and the re-latch 80 rotates and resets to be locked with the lock latch 60 under the action of the re-latch spring 82.

[0045] The rocker arm assembly 50 of the present embodiment includes a handle 51 and a rocker arm 52 which are fixedly connected. The handle 51 is rotated to rotate the rocker arm 52 around a rocker arm shaft 521. A rocker arm spring for resetting the rocker arm 52 is provided between the rocker arm 52 and the bracket 40.

[0046] The first crank 71 of this embodiment is a triangular plate structure with three corners. The first corner of the first crank 71 is pivotally arranged on the trip buckle 70 through the first crank shaft, the second corner of the first crank 71 is provided with a first crank limit shaft that is limited to the trip buckle 70, and the third corner of the first crank 71 is provided with a limit notch that is limited to the linkage rod 30. The bottom edge of the trip buckle 70 is provided with a recessed opening that is limited to the first crank limit shaft. When the switch is normally opened / closed, the first crank limit shaft is placed in the recessed opening of the trip buckle 70, and the first crank 71 is linked with the trip buckle 70; when the switch is tripped, the first crank limit shaft is separated from the recessed opening of the trip buckle 70, and the first crank 71 and the trip buckle 70 can rotate relative to each other.

[0047] The transmission assembly 90 of this embodiment is linked with the contact support 16 through the transmission shaft 160, driving the contact support 16 and the moving contact 13 to rotate around the contact shaft 14. The transmission assembly 90 includes a first connecting rod 91, a second connecting rod 92, and a second crank 93. The second crank 93 is similar to a triangular plate structure and has three corners. One end of the first connecting rod 91 is hinged to the linkage rod 30, and the two ends of the second connecting rod 92 are respectively hinged to the other end of the first connecting rod 91 and the first corner of the second crank 93. The second corner of the second crank 93 is pivotally arranged on the contact shaft 14, and the third corner of the second crank 93 is hinged to the transmission shaft 160.

[0048] The movable contact 13 of this embodiment can rotate the re-lock 80 to unlock the lock 60 through the first push rod 21, the second push rod 24 and the third push rod 25. When the movable contact 13 is electrically repelled by the short-circuit current, the movable contact 13 rotates, causing the first push rod 21 to rotate around the first push rod shaft 22, driving the coupled second push rod 24 and the third push rod 25 to rotate, and the third push rod 25 acts on the re-lock 80 to rotate and unlock the lock 60, so that the circuit breaker is tripped; when the re-lock is made, the first push rod 21 is reset under the action of the first push rod spring 23, and the second push rod 24 and the third push rod 25 are reset under the action of the third push rod spring 26. It should be noted that the structure and principle of the operating mechanism of this embodiment and the technology of the movable contact 13 unlocking the re-lock 80 and the lock 60 are all achievable in the prior art and will not be repeated here.

[0049] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0050] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A moving contact assembly, comprising a moving contact (13) and a connecting plate (11), wherein one end of the moving contact (13) is a contact portion (13a) for cooperating with a stationary contact (18), and a moving contact mounting portion (13b) at the other end of the moving contact (13) is pivotally mounted on the connecting plate (11), characterized in that: The movable contact assembly (10) further comprises a conductive gasket (12), the pivotal mounting portion between the movable contact (13) and the connecting plate (11) is connected via the conductive gasket (12), and the conductive gasket (12) and the movable contact (13) are slidably matched.

2. The moving contact assembly according to claim 1, characterized in that: One side of the conductive gasket (12) is in contact with the connecting plate (11), the other side of the conductive gasket (12) is a convex curved surface (12a), and the movable contact (13) is provided with a curved surface groove (13c) that slidably cooperates with the convex curved surface (12a).

3. The moving contact assembly according to claim 1, characterized in that: The pivotal mounting portion between the moving contact (13) and the connecting plate (11) comprises a moving contact mounting portion (13b) and two connecting plate mounting portions (11a), a contact rotating shaft (14) is arranged between the two connecting plate mounting portions (11a), the moving contact mounting portion (13b) is pivotally mounted on the contact rotating shaft (14) and is located between the two connecting plate mounting portions (11a), and a conductive gasket (12) is respectively arranged between the two sides of the moving contact mounting portion (13b) and the two connecting plate mounting portions (11a).

4. The moving contact assembly according to claim 1, characterized in that: It also includes a contact support (16), and the operating mechanism drives the moving contact (13) through the contact support (16). The pivotal installation part between the moving contact (13) and the connecting plate (11) is limited in the receiving groove (16c) of the contact support (16). The contact support (16) and the moving contact (13) are pivotally installed on the same contact shaft (14).

5. The moving contact assembly according to claim 4, characterized in that: It also includes a compression spring (110), wherein the pivotal mounting portion between the moving contact (13) and the connecting plate (11) is limited in a receiving groove (16c) of the contact support (16) by the compression spring (110), and the compression spring (110) is sleeved on the contact shaft (14) and pre-tightened between the pivotal mounting portion and the wall of the receiving groove (16c).

6. The moving contact assembly according to claim 4, characterized in that: It also includes a contact torsion spring (130), which is sleeved on the contact shaft (14), one end of which is connected to the receiving groove (16c) of the contact support (16), and the other end of which is connected to the contact portion (13a) of the moving contact (13).

7. The moving contact assembly according to claim 4, characterized in that: Both ends of the contact rotating shaft (14) are respectively inserted into two fixed shaft sleeves (140).

8. The moving contact assembly according to claim 4, characterized in that: It also includes an insulating tail wing (15), one end of which is wrapped around the connection between the contact portion (13a) and the moving contact mounting portion (13b) of the moving contact (13), and the arc-isolating portion (15a) at the other end is spaced apart from the contact support (16); the arc-isolating portion (15a) of the insulating tail wing (15) is used to slideably cooperate with the second arc-shaped groove (19a) of the unit housing (19).

9. The moving contact assembly according to claim 4, characterized in that: The contact support (16) is provided with a transmission shaft (160) for driving connection with an operating mechanism; and the outer walls on both sides of the contact support (16) are provided with an annular groove (16d) surrounding the contact rotating shaft (14) and at least one first arc-shaped convex rib (16e) surrounding the transmission shaft (160).

10. The moving contact assembly according to claim 4, characterized in that: An arc isolation sheet (17) is respectively provided on the outer sides of both sides of the contact support (16).

11. The moving contact assembly according to claim 4, characterized in that: The contact support (16) comprises a contact support connecting portion (16a) and two symmetrically arranged contact support mounting portions (16b), wherein the contact support connecting portion (16a) is connected between the two contact support mounting portions (16b) to form the accommodating groove (16c).

12. Molded case circuit breaker, characterized in that: It comprises an operating mechanism and a moving contact assembly according to any one of claims 1 to 11, wherein the operating mechanism drives a moving contact (13) of the moving contact assembly to rotate on a connecting plate (11), so that the moving contact (13) is disconnected or closed with a stationary contact (18).

13. The molded case circuit breaker according to claim 12, characterized in that: The operating mechanism comprises a linkage rod (30), a bracket (40), a rocker assembly (50) pivotally arranged on the bracket (40), a trip button (70), a lock button (60) and a re-lock button (80), a main spring (31) arranged between the rocker assembly (50) and the linkage rod (30), a first crank (71) pivotally arranged on the trip button (70) and limitedly matched with the trip button (70) and the linkage rod (30), and the linkage rod (30) is linked with the moving contact (13); when opening / closing the switch, the rocker assembly (50) is rotated to drive the linkage rod (30) through the main spring (31), and the linkage rod (30) is locked. (30) drives the moving contact (13) to rotate, so that the moving contact (13) and the stationary contact (18) open and close, and the linkage rod (30) drives the trip buckle (70) through the first crank (71) at the same time, the trip buckle (70) and the lock buckle (60) are kept in a locked state, and the lock buckle (60) is also kept in a locked state with the re-lock (80); when tripping, the re-lock (80) rotates to unlock with the lock buckle (60), and the lock buckle (60) rotates to unlock with the trip buckle (70), driving the trip buckle (70) to rotate, driving the linkage rod (30) to rotate the moving contact (13), so that the moving contact (13) and the stationary contact (18) are disconnected.

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