Contact system of molded case circuit breaker

Abstract

The utility model discloses a contact system of a molded case circuit breaker. The contact system comprises a moving contact group and a conductive bracket, the device further comprises a hinge shaft and an elastic clamp. The conductive support comprises a first support arm and a second support arm. The movable contact group is located between the first support arm and the second support arm, and the two sides of the movable contact group are attached to the inner surfaces of the first support arm and the second support arm respectively; the hinge shaft passes through the movable contact group, the first support arm and the second support arm, so that the movable contact group is hinged to the first support arm and the second support arm. The elasticity of the elastic clamp is better than that of the conductive support. The elastic clamp comprises a first elastic arm and a second elastic arm. The first elastic arm abuts against the outer surface of the first support arm, and the second elastic arm abuts against the outer surface of the second support arm, so that the inner surfaces of the first support arm and the second support arm are in stable contact with the moving contact group. The conductive film has the characteristic of relatively good conductive performance.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and in particular to a contact system of a molded case circuit breaker. Background Art

[0002] The connection and disconnection of single-breakpoint molded case circuit breakers are often achieved by the contact and separation of moving and static contacts.

[0003] There are usually two ways to connect the existing moving contact and the terminal. One is to use a soft connection, one end of the soft connection is welded to the moving contact, and the other end of the soft connection is welded to the terminal. The other is to use a hard connection structure, including a conductive bracket and a hard busbar, the moving contact and the conductive bracket form a rotational connection (the conductive bracket serves as both a rotating support and a conductor), and the conductive bracket is connected to the terminal through the hard busbar (using riveting, screws, etc.).

[0004] When using a soft connection, since both ends of the soft connection need to be welded, this connection method will cause the temperature rise of the product to be relatively high.

[0005] However, if the processing precision of the existing hard connection method is not high or the conductive bracket is fatigued, it is easy to cause the conductive bracket and the moving contact to be loose, which will lead to a decrease in the conductive performance. And if the gap between the conductive bracket and the moving contact reaches a certain level, the arc may burn the transition part of the moving contact.

[0006] For example, a circuit breaker with high arc extinguishing performance disclosed in CN214898283U adopts the above-mentioned hard connection structure.

[0007] Therefore, how to improve the hard connection structure is also a direction worthy of further study in this field. Summary of the invention

[0008] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a contact system for a molded case circuit breaker.

[0009] The present application provides: a contact system of a molded case circuit breaker, comprising a moving contact piece group and a conductive bracket; wherein, it also comprises a hinge shaft and an elastic clip; the conductive bracket comprises a first bracket arm and a second bracket arm; the moving contact piece group is located between the first bracket arm and the second bracket arm, and the two sides of the moving contact piece group are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm; the hinge shaft passes through the moving contact piece group, the first bracket arm and the second bracket arm, so that the moving contact piece group is hinged with the first bracket arm and the second bracket arm; the elasticity of the elastic clip is better than that of the conductive bracket, and the elastic clip comprises a first elastic arm and a second elastic arm; the first elastic arm abuts against the outer surface of the first bracket arm, and the second elastic arm abuts against the outer surface of the second bracket arm, so that the inner surfaces of the first bracket arm and the second bracket arm are in stable contact with the moving contact piece group.

[0010] By adopting this structure, the movable contact piece group is rotatably connected with the first bracket arm and the second bracket arm through the hinge shaft, and the two sides of the movable contact piece group are respectively abutted against the inner surfaces of the first bracket arm and the second bracket arm. Then, the first elastic arm and the second elastic arm are used to support and improve the contact stability between the two sides of the movable contact piece group and the inner surfaces of the first bracket arm and the second bracket arm. Such contact stability will be much better than the existing technology, thereby avoiding the situation where the electrical performance is reduced due to loose contact between the several.

[0011] In some embodiments of the present application, the first elastic arm and the second elastic arm are both provided with a through hole for the hinge shaft to pass through; the elastic clip includes a connecting arm, which connects the first elastic arm and the second elastic arm.

[0012] With this structure, the first elastic arm and the second elastic arm are both provided with perforations for the hinge shaft to pass through. This structure enables the conductive bracket, the hinge shaft, the moving contact piece group and the elastic clip to be connected very tightly, forming a small component which will greatly facilitate assembly.

[0013] In some embodiments of the present application, the movable contact piece group includes a movable contact piece, and two side surfaces of the movable contact piece are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm.

[0014] This structure is applicable to the case of a single-piece movable contact piece. In the case of a single piece, the two side surfaces of the movable contact piece are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm.

[0015] In some embodiments of the present application, it also includes a contact support, a contact pressure plate, a first pin shaft and two contact springs. A contact installation space is provided on the contact support, and a hinge between the moving contact piece and the conductive bracket is located in the contact installation space; the moving contact piece is provided with a first convex portion located in the contact installation space, a first through hole is provided on the first convex portion, a first pin shaft is arranged through the first through hole, and the contact pressure plate is rotatably connected to the first pin shaft; two first installation portions are provided in the contact installation space, and two second installation portions are provided on the contact pressure plate; the first installation portion and the second installation portion correspond to each other one by one, and a contact spring is abutted between the two, and the two springs are respectively provided on both sides of the moving contact piece.

[0016] By adopting this structure, the contact spring, the contact pressure plate and the first pin shaft can be used to provide medium pressure for the single-piece moving contact piece.

[0017] In some embodiments of the present application, the moving contact piece group includes a first moving contact piece and a second moving contact piece arranged side by side, the surface of the first moving contact piece away from the second moving contact piece is in contact with the inner surface of the first bracket arm, and the surface of the second moving contact piece away from the first moving contact piece is in contact with the inner surface of the second bracket arm.

[0018] This structure is applicable to the case of two movable contact pieces. In the case of two movable contact pieces, the two movable contact pieces are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm.

[0019] In some embodiments of the present application, a gasket is further included. The gasket is arranged between the first moving contact piece and the second moving contact piece. The gasket is in contact with the first moving contact piece and the second moving contact piece, and the hinge shaft passes through the gasket.

[0020] This gasket structure is suitable for the case of two moving contact pieces, and the gasket can ensure that there is a gap between the two moving contact pieces.

[0021] In some embodiments of the present application, it also includes a contact support, a contact installation space is opened on the contact support, and the hinge between the moving contact piece group and the conductive bracket is located in the contact installation space; it also includes a first contact pressure plate, a second contact pressure plate, a first sub-pin shaft, a second sub-pin shaft, a first contact spring and a second contact spring arranged in the contact installation space; the first moving contact piece is provided with a first convex portion I located in the contact installation space, the second moving contact piece is provided with a first convex portion II located in the contact installation space, the first convex portion I is provided with a first through hole I, and the first convex portion II is provided with a first through hole A first through hole II is provided; a first sub-pin shaft passes through the first contact pressure plate and the first through hole I, so that the first contact pressure plate is rotatably arranged; a second sub-pin shaft passes through the second contact pressure plate and the first through hole II, so that the second contact pressure plate is rotatably arranged; two first mounting parts are provided in the contact mounting space, a second mounting part I is provided on the first contact pressure plate, and a second mounting part II is provided on the second contact pressure plate; a first contact spring abuts between the second mounting part I and one of the first mounting parts; a second contact spring abuts between the second mounting part II and the other first mounting part.

[0022] With this structure, the first contact pressure plate, the second contact pressure plate, the first sub-pin shaft, the second sub-pin shaft, the first contact spring and the second contact spring can be used to provide a medium pressure for the structure of the two movable contact pieces.

[0023] In some embodiments of the present application, the first sub-pin shaft includes a first rod portion and a first limiting portion, and the size of the first limiting portion is larger than the size of the first rod portion and the first through hole I; the second sub-pin shaft includes a second rod portion and a second limiting portion, and the size of the second limiting portion is larger than the size of the second rod portion and the first through hole II; the first limiting portion and the second limiting portion are arranged adjacent to or in contact with each other.

[0024] By adopting this structure, the first limiting part and the second limiting part can be arranged adjacently or close to each other so that they can form a limit between each other, thereby ensuring the installation stability of the first sub-pin shaft and the second sub-pin shaft.

[0025] In some embodiments of the present application, the first contact pressure plate further includes a first transition portion, the first transition portion is for the first rod portion to pass through, and the first transition portion is between the first limiting portion and the first protrusion I; the second contact pressure plate further includes a second transition portion, the second transition portion is for the second rod portion to pass through, and the second transition portion is between the second limiting portion and the first protrusion II.

[0026] With this structure, the design of the first adapter portion and the second adapter portion will make the rotational connection between the first contact pressure plate and the second contact pressure plate more stable.

[0027] In some embodiments of the present application, a first reinforcing rib is provided on the first bracket arm, and the first reinforcing rib is a convex structure formed by stamping a portion of the first bracket arm toward its inner surface; and / or a second reinforcing rib is provided on the second bracket arm, and the second reinforcing rib is a convex structure formed by stamping a portion of the second bracket arm toward its inner surface.

[0028] With this structure, the reinforcing ribs are easier to form, and the weight of the first bracket arm and the second bracket arm will not be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A three-dimensional diagram of a first mode of the contact system of Example 1 of the present application is shown;

[0031] Figure 2 A schematic diagram showing the first contact support mode of the contact system in Example 1 of the present application is shown;

[0032] Figure 3 A schematic diagram showing the first method of contact support removal of the contact system in Example 1 of the present application is shown;

[0033] Figure 4 An exploded view of the first method of contact support of the contact system of Example 1 of the present application is shown;

[0034] Figure 5 An axial view and a partial enlarged view of the contact support of the contact system in the first embodiment of the present application are shown;

[0035] Figure 6 A perspective view of a second embodiment of the contact system of the first embodiment of the present application is shown;

[0036] Figure 7 A schematic diagram showing the second contact support mode of the contact system in Example 1 of the present application is shown;

[0037] Figure 8 A schematic diagram showing the second method of contact support for the contact system of embodiment 1 of the present application is shown;

[0038] Fig. 9 An exploded view of the second method of contact support of the contact system in Example 1 of the present application is shown;

[0039] Fig.10A schematic structural diagram of the first contact pressure plate, the second contact pressure plate, the first sub-pin shaft, and the second sub-pin shaft in the second mode of the contact system in Embodiment 1 of the present application is shown;

[0040] Fig.11 An axial view and a partial enlarged view of the second method of contact support of the contact system of Example 1 of the present application are shown. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "primary" and "secondary" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, the main feature being "above" or "below" the second feature may mean that the main feature and the second feature are in direct contact, or that the main feature and the second feature are in indirect contact through an intermediate medium. Moreover, the main feature being "above", "above" and "above" the second feature may mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. The main feature being "below", "below" and "below" the second feature may mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0046] like Figure 1-Figure 11 As shown, an embodiment of the present application provides a contact system for a molded case circuit breaker.

[0047] The contact system includes a movable contact piece group, a conductive bracket 100 , a hinge shaft 200 and an elastic clip 300 .

[0048] Here, the conductive support 100 includes a first support arm 101, a second support arm 102 and a bottom support arm 103, wherein the bottom support arm 103 is fixed to the housing of the circuit breaker. The first support arm 101 and the second support arm 102 are both connected to the bottom support arm 103, and the hinge shaft 200 passes through the first support arm 101, the second support arm 102 and the moving contact piece group, so that the moving contact piece group and the conductive support 100 are rotatably connected.

[0049] Here, two sides of the movable contact piece group are respectively in contact with the inner surfaces of the first bracket arm 101 and the second bracket arm 102 .

[0050] The elastic clip 300 includes a first elastic arm 301, a second elastic arm 302 and a connecting arm 303. The first elastic arm 301 and the second elastic arm 302 are connected via the connecting arm 303. The first elastic arm 301 abuts against the outer surface of the first bracket arm 101, and the second elastic arm 302 abuts against the outer surface of the second bracket arm 102. Here, the elasticity of the elastic clip 300 is greater than the elasticity of the conductive bracket 100, so that the conductive bracket 100 can be in close contact with the movable contact piece group to ensure electrical performance.

[0051] Of course, the hinge shaft 200 here can penetrate the first elastic arm 301 and the second elastic arm 302, that is, the first elastic arm 301 and the second elastic arm 302 are both provided with a through hole 3012, and the through hole 3012 is used for the hinge shaft 200 to pass through. Of course, in addition to this, a non-penetrating method can also be adopted, that is, the hinge shaft 200 has no direct connection with the first elastic arm 301 and the second elastic arm 302.

[0052] The following will introduce this contact system in detail through the different structures of the moving contact piece 400 in the moving contact piece group.

[0053] Option 1: Figure 1-5 As shown, in this manner, the contact system includes a contact support 800, and three contact installation spaces S1 are opened on the contact support 800. Here, since the structure in each contact installation space S1 is the same, the structure in one contact installation space S1 is taken as an example.

[0054] The movable contact piece 400 of the movable contact piece group is one piece, one end of the movable contact piece 400 is located in the contact installation space S1 , and the other end thereof passes through the outside of the contact support 800 .

[0055] A portion of the first bracket arm 101 and the second bracket arm 102 of the conductive bracket 100 is located in the contact installation space S1 , and specifically, the hinged portion between the first bracket arm 101 , the second bracket arm 102 and the movable contact piece 400 is located in the contact installation space S1 .

[0056] Here, two side surfaces of the movable contact piece 400 are respectively in contact with the inner surfaces of the first support arm 101 and the second support arm 102 .

[0057] The movable contact piece 400 includes a first protrusion 401, which is close to the hinge position, that is, the first protrusion 401 is also located in the contact installation space S1. A first through hole 4012 is provided on the first protrusion 401, and the first pin shaft 500 passes through the first through hole 4012, so that the two ends of the first pin shaft 500 are located on both sides of the first protrusion 401. The contact pressure plate 600 is rotatably connected with the first pin shaft 500, and a second mounting portion 601 is provided on the contact pressure plate 600, and the two second mounting portions 601 are respectively provided on both sides of the movable contact piece 400. Two first mounting portions S11 are provided in the contact installation space S1, and the first mounting portion S11 corresponds to the second mounting portion 601 one by one, and a contact spring 700 is abutted between each first mounting portion S11 and the second mounting portion 601. Here, the first mounting portion S11 and the second mounting portion 601 both adopt a groove structure. Of course, in addition to this, a convex structure can also be adopted.

[0058] Option 2: Figure 6-11 As shown, in this manner, the contact system includes a contact support 800, and three contact installation spaces S1 are opened on the contact support 800. Here, since the structure in each contact installation space S1 is the same, the structure in one contact installation space S1 is taken as an example.

[0059] The movable contact piece 400 of the movable contact piece group consists of two pieces, namely a first movable contact piece 400a and a second movable contact piece 400b. One end of the first movable contact piece 400a and the second movable contact piece 400b are both located in the contact installation space S1, and the other end is extended to the outside of the contact support 800.

[0060] One surface of the first moving contact piece 400a is in contact with the inner surface of the first bracket arm 101, and one surface of the first moving contact piece here refers to the surface away from the second moving contact piece 400b. Similarly, one surface of the second moving contact piece 400b is in contact with the inner surface of the second bracket arm 102, and one surface of the second moving contact piece 400b here refers to the surface away from the first moving contact piece 400a.

[0061] There is a gap between the first moving contact piece 400 a and the second moving contact piece 400 b , and the gap is realized by the gasket 900 , that is, there is a gasket 900 between the first moving contact piece 400 a and the second moving contact piece 400 b , and the gasket 900 here is also penetrated by the hinge shaft 200 .

[0062] The first movable contact piece 400a is provided with a first convex part I401a, and similarly, the second movable contact piece 400b is provided with a first convex part II401b. The first convex part I401a is provided with a first through hole I4012a, and the first convex part II401b is provided with a first through hole II4012b.

[0063] The first contact pressing plate 600a includes a second mounting portion I601a and a first transition portion 601c, which are disposed on both sides of the first convex portion I401a. The first sub-pin 500a passes through the first transition portion 601c and the first convex portion I401a.

[0064] The second contact pressing plate 600b includes a second mounting portion II 601b and a second transition portion 601d, which are disposed on both sides of the first convex portion II 401b. The second sub-pin 500b passes through the second transition portion 601d and the first convex portion II 401b.

[0065] Two first mounting portions S11 are provided in the contact mounting space S1. The first contact spring 700a abuts between the second mounting portion I 601a and one first mounting portion S11, and the second contact spring 700b abuts between the second mounting portion II 601b and the other first mounting portion S11.

[0066] The first sub-pin shaft 500a here includes a first rod portion 500a1 and a first limiting portion 500a2. The size of the first limiting portion 500a2 is larger than the first rod portion 500a1 and the first through hole I4012a. The first rod portion 500a1 is used to pass through the first adapter portion 601c and the first convex portion I401a. Similarly, the second sub-pin shaft 500b here includes a second rod portion 500b1 and a second limiting portion 500b2. The size of the second limiting portion 500b2 is larger than the size of the second rod portion 500b1 and the first through hole II4012b. The second rod portion 500b1 is used to pass through the second adapter portion 601d and the first convex portion II401b. The first limiting portion 500a2 and the second limiting portion 500b2 here are arranged in close contact. Of course, they can also be arranged adjacently.

[0067] Regardless of the above scheme, reinforcing ribs can be provided on the first bracket arm 101 and the second bracket arm 102, which are divided into first reinforcing ribs 1010 and second reinforcing ribs 1020. The first reinforcing rib 1010 is a convex structure formed by punching a part of the first bracket arm 101 toward its inner surface, and similarly, the second reinforcing rib 1020 is a convex structure formed by punching a part of the second bracket arm 102 toward its inner surface.

[0068] For the above contact systems, which are single-breakpoint contact systems, the static contacts they are adapted to can be either fixed static contacts or rotating static contacts.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0070] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A contact system for a molded case circuit breaker, comprising a movable contact piece group and a conductive bracket; characterized in that: It also includes a hinge shaft and an elastic clip; the conductive bracket includes a first bracket arm and a second bracket arm; the movable contact piece group is located between the first bracket arm and the second bracket arm, and the two sides of the movable contact piece group are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm; the hinge shaft passes through the movable contact piece group, the first bracket arm and the second bracket arm, so that the movable contact piece group is hinged with the first bracket arm and the second bracket arm; the elasticity of the elastic clip is better than that of the conductive bracket, and the elastic clip includes a first elastic arm and a second elastic arm; the first elastic arm abuts against the outer surface of the first bracket arm, and the second elastic arm abuts against the outer surface of the second bracket arm, so that the inner surfaces of the first bracket arm and the second bracket arm are in stable contact with the movable contact piece group.

2. A contact system for a molded case circuit breaker according to claim 1, characterized in that: The first elastic arm and the second elastic arm are both provided with through holes, and the through holes are used for the hinge shaft to pass through; the elastic clip includes a connecting arm, and the connecting arm connects the first elastic arm and the second elastic arm.

3. The contact system of a molded case circuit breaker according to claim 1, characterized in that: The movable contact piece group comprises a movable contact piece, and two side surfaces of the movable contact piece are respectively in contact with the inner surfaces of the first bracket arm and the second bracket arm.

4. The contact system of a molded case circuit breaker according to claim 3, characterized in that: It also includes a contact support, a contact pressure plate, a first pin shaft and two contact springs. A contact installation space is provided on the contact support, and a hinge between the moving contact piece and the conductive bracket is located in the contact installation space; the moving contact piece is provided with a first convex portion located in the contact installation space, a first through hole is provided on the first convex portion, a first pin shaft is arranged through the first through hole, and the contact pressure plate is rotatably connected to the first pin shaft; two first installation portions are provided in the contact installation space, and two second installation portions are provided on the contact pressure plate; the first installation portion and the second installation portion correspond to each other one by one, and a contact spring is abutted between the two, and the two springs are respectively provided on both sides of the moving contact piece.

5. The contact system of a molded case circuit breaker according to claim 1, characterized in that: The moving contact piece group includes a first moving contact piece and a second moving contact piece arranged side by side, the surface of the first moving contact piece away from the second moving contact piece is in contact with the inner surface of the first bracket arm, and the surface of the second moving contact piece away from the first moving contact piece is in contact with the inner surface of the second bracket arm.

6. A contact system for a molded case circuit breaker according to claim 5, characterized in that: It also includes a gasket, which is arranged between the first moving contact piece and the second moving contact piece, the gasket is in contact with the first moving contact piece and the second moving contact piece, and the hinge shaft passes through the gasket.

7. The contact system of a molded case circuit breaker according to claim 5, characterized in that: The invention also includes a contact support, a contact installation space is provided on the contact support, and the hinge between the movable contact piece group and the conductive bracket is located in the contact installation space; the first contact pressure plate, the second contact pressure plate, the first sub-pin shaft, the second sub-pin shaft, the first contact spring and the second contact spring are arranged in the contact installation space; the first movable contact piece is provided with a first convex part I located in the contact installation space, the second movable contact piece is provided with a first convex part II located in the contact installation space, the first convex part I is provided with a first through hole I, the first convex part II is provided with a first through hole Ⅱ; the first sub-pin shaft passes through the first contact pressure plate and the first through hole Ⅰ, so that the first contact pressure plate is rotatable; the second sub-pin shaft passes through the second contact pressure plate and the first through hole Ⅱ, so that the second contact pressure plate is rotatable; two first mounting parts are arranged in the contact mounting space, the first contact pressure plate is provided with a second mounting part Ⅰ, and the second contact pressure plate is provided with a second mounting part Ⅱ; the first contact spring abuts between the second mounting part Ⅰ and one of the first mounting parts; the second contact spring abuts between the second mounting part Ⅱ and the other first mounting part.

8. The contact system of a molded case circuit breaker according to claim 7, characterized in that: The first sub-pin shaft includes a first rod portion and a first limiting portion, and the size of the first limiting portion is larger than the size of the first rod portion and the first through hole I; the second sub-pin shaft includes a second rod portion and a second limiting portion, and the size of the second limiting portion is larger than the size of the second rod portion and the first through hole II; the first limiting portion and the second limiting portion are arranged adjacent to or in contact with each other.

9. A contact system for a molded case circuit breaker according to claim 8, characterized in that: The first contact pressure plate also includes a first transition portion, through which the first rod portion passes, and the first transition portion is located between the first limiting portion and the first protrusion I; the second contact pressure plate also includes a second transition portion, through which the second rod portion passes, and the second transition portion is located between the second limiting portion and the first protrusion II.

10. A contact system for a molded case circuit breaker according to any one of claims 1 to 9, characterized in that: A first reinforcing rib is provided on the first bracket arm, and the first reinforcing rib is a convex structure formed by punching a part of the first bracket arm toward its inner surface; and / or a second reinforcing rib is provided on the second bracket arm, and the second reinforcing rib is a convex structure formed by punching a part of the second bracket arm toward its inner surface.

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