Circuit breaker plugging device and system

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a circuit breaker plug-in device and system, the circuit breaker plug-in device comprises contact pieces, an elastic piece and a pressing plate, the two contact pieces are suitable for being symmetrically arranged at two sides of the end part of a busbar, a plug-in space is formed between the two contact pieces, the plug-in space is suitable for installing a moving contact, the elastic piece is in a sheet-shaped structure, and the pressing plate is arranged on the elastic piece. The two elastic sheets are arranged on one side, far away from the busbar, of the contact sheets, and the two pressing plates are arranged on one side, far away from the contact sheets, of the elastic sheets, so that when the moving contact is plugged in the plugging space, the elastic sheets can provide downward pressure to the contact sheets to ensure that the contact sheets are tightly connected with the moving contact; and meanwhile, the elastic sheet with the sheet-shaped structure has a relatively large heat dissipation area, so that the temperature of the elastic sheet is not too high, the elastic sheet can provide enough pressing force for the contact piece, and the contact stability of the contact piece and the moving contact is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a plug-in device and a system for a circuit breaker. Background Art

[0002] A molded case circuit breaker (MCCB) is a mechanical switching device that can connect, carry, and break the current under normal circuit conditions, and can also connect, carry for a certain time, and break the current under specified abnormal circuit conditions.

[0003] The moving contact and the static contact are important parts of the MCCB, mainly responsible for controlling and disconnecting the circuit. When the MCCB is in the energized state, a certain contact pressure is formed between the moving contact and the static contact, enabling the current to pass through the MCCB and work properly. If a circuit fault occurs and the circuit needs to be disconnected, the MCCB will automatically disconnect the circuit. At this time, the contact pressure between the moving contact and the static contact will become smaller or disappear, and the circuit is cut off.

[0004] In the prior art, the static contacts of MCCBs mostly use plug-in connectors. In the plug-in connectors, a pressure spring applies pressure to the contact piece to make the contact piece in close contact with the moving contact. After long-term use, the pressure spring is prone to heat deformation and lose pressure, resulting in poor contact of the MCCB. Summary of the Utility Model

[0005] In view of this, the utility model provides a plug-in device and a system for a circuit breaker to solve the problem that the pressure spring of the MCCB in the prior art is prone to heat deformation.

[0006] In a first aspect, the utility model provides a plug-in device for a circuit breaker, including contact pieces, elastic pieces, and pressing plates. Two contact pieces are adapted to be symmetrically arranged on both sides of the end of the busbar. A plug-in space is formed between the two contact pieces, and the plug-in space is adapted to install a moving contact. The elastic pieces are in a sheet structure. Two elastic pieces are arranged on the side of the contact pieces away from the busbar, and two pressing plates are arranged on the side of the elastic pieces away from the contact pieces.

[0007] Beneficial effects: By arranging elastic pieces on the side of the two contact pieces away from the busbar, when the moving contact is plugged into the plug-in space, the elastic pieces can provide a downward pressure on the contact pieces to ensure the close connection between the contact pieces and the moving contact. At the same time, the elastic pieces in a sheet structure have a large heat dissipation area, which can ensure that the temperature of the elastic pieces will not be too high. Thus, the elastic pieces can provide sufficient pressing force for the contact pieces, further ensuring the stability of the contact between the contact pieces and the moving contact.

[0008] In an optional embodiment, the contact piece includes a first fixed portion and a plug-in portion, the first fixed portion is suitable for being fixedly connected to the busbar, a plurality of spaced-apart plug-in portions are connected to the first fixed portion, the spring piece includes a second fixed portion and an elastic portion, the second fixed portion is fixedly connected to the first fixed portion, a plurality of spaced-apart elastic portions are abutted against the plug-in portion, and the pressure plate includes a third fixed portion and a crimping portion, the third fixed portion is fixedly connected to the second fixed portion, and a plurality of spaced-apart crimping portions are abutted against the elastic portion.

[0009] Beneficial effect: The utility model arranges a plurality of spaced adjacent plug-in parts on the contact piece, and the plug-in parts are squeezed by the elastic force, so that the plug-in parts and the moving contacts are more firmly plugged in. At the same time, the spaced plug-in parts and the elastic parts have better heat dissipation effect, which can prevent the temperature of the spring piece from being too high.

[0010] In an optional embodiment, a first mounting hole is provided on the first fixing portion, a second mounting hole is provided on the second fixing portion, a third mounting hole is provided on the third fixing portion, and fasteners are installed in the first mounting hole, the second mounting hole and the third mounting hole.

[0011] Beneficial effect: The utility model can firmly connect the pressure plate, the spring sheet and the contact sheet by arranging the fasteners.

[0012] In an optional embodiment, a groove is provided at the connection between the adjacent plug-in portion and the first fixing portion.

[0013] Beneficial effect: The utility model can reduce stress concentration at the connection between the adjacent plug-in parts and the fixing part by providing a groove at the connection between the adjacent plug-in parts and the first fixing part.

[0014] In an optional implementation, a bending portion is provided on the plug-in portion, and the bending portion is connected to the fixing portion.

[0015] Beneficial effect: The utility model provides a bending portion on the plug-in portion, so that the sides of the plug-in portion plugging the moving contact can be bent closer to each other, thereby providing a tighter clamping force for the moving contact.

[0016] In an optional embodiment, ends of the plug-in portions on the two contacts that are located away from the busbar are away from each other.

[0017] Beneficial effects: The utility model can facilitate the insertion of the moving contact into the plug-in space by setting the ends of the plug-in parts on the two contact pieces located away from the busbar to be trumpet-shaped and away from each other.

[0018] In a second aspect, the present utility model also provides a circuit breaker plug-in system, which includes a housing, the above-mentioned circuit breaker plug-in device, a busbar, and a moving contact. At least one circuit breaker plug-in device is fixedly installed in the housing, at least one busbar is fixedly installed in the housing, the busbar is connected to the contact piece, and at least one moving contact is movably arranged in the housing. One end of the moving contact is adapted to be connected to the operating mechanism, and the other end is movably connected to the contact piece.

[0019] In an optional embodiment, the moving contact has an S-shaped structure. One end of the moving contact is adapted to be movably inserted between two contact pieces, and a limiting portion is provided at the other end of the moving contact. The limiting portion is adapted to be in limit engagement with the operating mechanism.

[0020] In an optional embodiment, a plurality of installation cavities are provided on the housing, and the busbar, the circuit breaker plug-in device, and the moving contact are correspondingly arranged in the installation cavities.

[0021] In an optional embodiment, the busbar is L-shaped, and an opening is provided on the housing at the position of the installation cavity. The busbar located at the opening is adapted to be connected to a power source.

[0022] Since the circuit breaker plug-in system adopts the circuit breaker plug-in device in the present utility model, it has the same beneficial effects as the circuit breaker plug-in device, which will not be elaborated here. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A three-dimensional structure diagram of a circuit breaker plug-in device according to an embodiment of the present utility model;

[0025] Figure 2 A side view of a circuit breaker plug-in device according to an embodiment of the present utility model;

[0026] Figure 3 A three-dimensional structure diagram of a contact piece in a circuit breaker plug-in device according to an embodiment of the present utility model;

[0027] Figure 4 A three-dimensional structure diagram of a spring piece in a circuit breaker plug-in device according to an embodiment of the present utility model;

[0028] Figure 5 A three-dimensional structure diagram of a pressure plate in a circuit breaker plug-in device according to an embodiment of the present utility model;

[0029] Figure 6 Stereoscopic structure diagram of a circuit breaker plug-in system according to an embodiment of the present utility model;

[0030] Figure 7 Stereoscopic structure diagram of a circuit breaker plug-in system according to an embodiment of the present utility model with the housing removed;

[0031] Figure 8 Rear view of the housing in a circuit breaker plug-in system according to an embodiment of the present utility model;

[0032] Figure 9 Front view of the housing in a circuit breaker plug-in system according to an embodiment of the present utility model;

[0033] Figure 10 Stereoscopic structure diagram of a moving contact in a circuit breaker plug-in system according to an embodiment of the present utility model;

[0034] Figure 11 Stereoscopic structure diagram of a bus bar in a circuit breaker plug-in system according to an embodiment of the present utility model.

[0035] Explanation of reference numerals:

[0036] 100, circuit breaker plug-in device;

[0037] 1, contact piece; 101, first fixing part; 102, plug-in part; 103, first mounting hole; 104, groove; 105, bending part;

[0038] 2, elastic piece; 201, second fixing part; 202, elastic part; 203, second mounting hole;

[0039] 3, pressing plate; 301, third fixing part; 302, crimping part; 303, third mounting hole;

[0040] 4, fastener;

[0041] 5, housing; 501, installation cavity; 502, opening;

[0042] 6, bus bar;

[0043] 7, moving contact; 701, limiting part. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0045] In the related art, the static contact of the plug-in connector MCCB is adopted, and a pressure spring applies pressure to the contact piece in the plug-in connector so that the contact piece is in close contact with the moving contact. After long-term use, the pressure spring is prone to heat deformation and lose pressure, resulting in poor contact of the MCCB. Poor contact will cause an increase in resistance, and excessive heat will be generated when current passes through, resulting in the failure of the circuit breaker switch. When the switch cannot correctly break the circuit, it will cause damage to electrical equipment. At the same time, the phenomenon of poor contact is prone to generate electric arcs. When an electric arc is generated, it will cause high temperature. If there are flammable substances such as combustible liquids and gases nearby, it will cause electrical fires, resulting in property losses and casualties.

[0046] The following Figures 1 to 11 describes the embodiments of the present invention.

[0047] According to the embodiments of the present invention, on the one hand, as Figures 1 to 5 shown, a circuit breaker plugging device 100 is provided, including contact pieces 1, elastic pieces 2 and pressing plates 3. Two contact pieces 1 are adapted to be symmetrically arranged on both sides of the end of the bus bar 6. A plugging space is formed between the two contact pieces 1, and the plugging space is adapted to install a moving contact 7. The elastic pieces 2 are in a sheet structure. Two elastic pieces 2 are arranged on the side of the contact piece 1 away from the bus bar 6, and two pressing plates 3 are arranged on the side of the elastic piece 2 away from the contact piece 1.

[0048] Specifically, in this embodiment, the shapes of the contact piece 1, the elastic piece 2 and the pressing plate 3 are not specifically limited. To conform to the actual situation, the contact piece 1, the elastic piece 2 and the pressing plate 3 adopt a rectangular structure in this embodiment, and the contact piece 1, the elastic piece 2 and the pressing plate 3 have the same width and the lengths increase in sequence. The two contact pieces 1 are arranged oppositely, one end of the two contact pieces 1 is fixedly connected to the bus bar 6, and a plugging space is formed between the ends of the two contact pieces 1 away from the bus bar 6. The plugging space can be used to plug and install the moving contact 7. The bus bar 6 is connected to the power supply, and the moving contact 7 is connected to the electrical equipment. When the moving contact 7 is plugged and installed in the plugging space, the power supply and the electrical equipment can be connected. When the moving contact 7 is separated from the plugging space, the power supply and the electrical equipment are powered off.

[0049] In this embodiment, the width of the elastic piece 2 is equal to that of the contact piece 1. While ensuring sufficient downward pressure on the contact piece 1, the larger-area elastic piece 2 has better heat dissipation effect. The end of the elastic piece 2 away from the fixed part with the contact piece 1 has an elastic force that provides a reduced plugging space for the elastic piece 2.

[0050] In this embodiment, the elastic piece 2 is made of 65 manganese steel. This material has high elastic limit and yield limit, and has a certain toughness, and also has good thermal conductivity. When a large current passes through the contact piece 1, the temperature of the contact piece 1 will rise, and the heat will be conducted to the elastic piece 2. The heat can be dissipated through the thermal conductivity of the elastic piece 2 and the larger heat dissipation area, thus avoiding the overheating of the contact piece 1.

[0051] In this embodiment, the contact piece 1 can be made of materials such as copper, silver, gold, copper alloy, silver alloy, silver tungsten alloy, etc. The above materials have low resistance, good electrical conductivity and good thermal conductivity.

[0052] In this embodiment, the material of the pressing plate 3 is not specifically limited. To conform to the actual situation, the pressing plate 3 in this embodiment is made of stainless steel.

[0053] In the present utility model, a spring piece 2 is arranged on one side of the two contact pieces 1 away from the bus bar 6. When the moving contact 7 is inserted into the insertion space, the spring piece 2 can provide a downward pressure on the contact piece 1 to ensure the close connection between the contact piece 1 and the moving contact 7. At the same time, the spring piece 2 with a sheet structure has a large heat dissipation area, which can ensure that the temperature of the spring piece 2 will not be too high. Therefore, the spring piece 2 can provide sufficient pressing force for the contact piece 1, thereby ensuring the stability of the contact between the contact piece 1 and the moving contact 7.

[0054] In one embodiment, as Figure 3 shown, the contact piece 1 includes a first fixing part 101 and an insertion part 102. The first fixing part is adapted to be fixedly connected to the bus bar 6, and a plurality of spaced insertion parts 102 are connected to the first fixing part 101. As Figure 4 shown, the spring piece 2 includes a second fixing part 201 and an elastic part 202. The second fixing part is fixedly connected to the first fixing part 101, and a plurality of spaced elastic parts 202 are in contact with the insertion parts 102. As Figure 5 shown, the pressing plate 3 includes a third fixing part 301 and a crimping part 302. The third fixing part 301 is fixedly connected to the second fixing part 201, and a plurality of spaced crimping parts 302 are in contact with the elastic parts 202.

[0055] Specifically, in this embodiment, the first fixing part 101 of the contact piece 1 is fixedly connected to the bus bar 6, the insertion part 102 is connected to the first fixing part 101 and extends away from the bus bar 6. An insertion space is formed between the insertion parts 102 on two opposite contact pieces 1. The second fixing part 201 is fixedly connected to the side of the first fixing part 101 away from the bus bar 6. A plurality of spaced elastic parts 202 are connected to the second fixing part 201. The elastic parts 202 are arranged in one-to-one correspondence with the insertion parts 102. Each elastic part 202 can provide a downward pressure on each insertion part 102 in the direction of the bus bar 6. The third fixing part 301 is fixedly connected to the side of the second fixing part 201 away from the first fixing part 101. A plurality of spaced crimping parts 302 are connected to the third fixing part 301. Each crimping part 302 is arranged corresponding to each elastic part 202. The crimping part 302 can press the elastic part 202 against the insertion part 102, so that the elastic part 202 provides a downward pressure on the insertion part 102.

[0056] In this embodiment, the number of the insertion parts 102 is not specifically limited. To conform to the actual situation, three mutually parallel insertion parts 102 are provided in this embodiment. In some other embodiments, the number of the insertion parts 102 can also be four, five, six or other numbers.

[0057] In this embodiment, the number of the elastic parts 202 is not specifically limited. To conform to the actual situation, the number of the elastic parts 202 is equal to the number of the insertion parts 102 in this embodiment, and the elastic parts 202 are in corresponding abutment with the insertion parts 102.

[0058] In this embodiment, the number of the crimping parts 302 is not specifically limited. To conform to the actual situation, the number of the crimping parts 302 is equal to the number of the elastic parts 202 in this embodiment, and the crimping parts 302 are in corresponding abutment with the elastic parts 202.

[0059] In the present utility model, a plurality of insertion parts 102 adjacent to each other at intervals are arranged on the contact piece 1. Through the extrusion force of the elastic parts 202 on the insertion parts 102, the insertion parts 102 can be inserted into the moving contact 7 more firmly. At the same time, the heat dissipation effect of the insertion parts 102 and the elastic parts 202 arranged at intervals is better, and the temperature of the elastic sheet 2 can be prevented from being too high.

[0060] In one embodiment, as Figure 3 shown, a first mounting hole 103 is provided on the first fixing part 101. As Figure 4 shown, a second mounting hole 203 is provided on the second fixing part 201. As Figure 5 shown, a third mounting hole 303 is provided on the third fixing part 301, and a fastener 4 is installed in the first mounting hole 103, the second mounting hole 203 and the third mounting hole 303.

[0061] Specifically, in this embodiment, the number of the first mounting hole 103, the second mounting hole 203 and the third mounting hole 303 is not specifically limited. To conform to the actual situation, two first mounting holes 103 are provided on the first fixing part 101, two second mounting holes 203 are provided on the second fixing part 201, two third mounting holes 303 are provided on the third fixing part 301, two fourth mounting holes are correspondingly provided on the bus bar 6, and two fasteners 4 are respectively correspondingly inserted into the first mounting hole 103, the second mounting hole 203 and the third mounting hole 303. In some other embodiments, the number of the first mounting hole 103, the second mounting hole 203 and the third mounting hole 303 can also be three, four or the like.

[0062] In this embodiment, the fastener 4 is not specifically limited. To conform to the actual situation, the fastener 4 adopts a rivet in this embodiment. In some other embodiments, the fastener 4 can also adopt a bolt or the like.

[0063] The present utility model can make the connection between the pressing plate 3, the elastic sheet 2 and the contact piece 1 firm by arranging the fastener 4.

[0064] In one embodiment, as Figure 3 shown, a groove 104 is provided at the connection between the adjacent insertion portions 102 and the first fixing portion 101.

[0065] Specifically, in this embodiment, two arc-shaped grooves 104 are provided at the connections between three adjacent insertion portions 102 and the first fixing portion 101.

[0066] By providing the groove 104 at the connection between the adjacent insertion portions 102 and the fixing portion, the present utility model can reduce the stress concentration at the connection between the adjacent insertion portions 102 and the fixing portion.

[0067] In one embodiment, as Figure 3 shown, a bending portion 105 is provided on the insertion portion 102, and the bending portion 105 is connected to the fixing portion.

[0068] Specifically, in this embodiment, the bending portion 105 bends in the direction in which the insertion portions 102 approach each other, and correspondingly, the bending portions 105 are also provided on the elastic portion 202 and the crimping portion 302.

[0069] By providing the bending portion 105 on the insertion portion 102, the present utility model can make the sides of the insertion portion 102 on the side where the moving contact 7 is inserted bend and approach each other, thereby providing a tighter clamping force for the moving contact 7.

[0070] In one embodiment, as Figure 1 and Figure 2 shown, the ends of the insertion portions 102 on the two contact pieces 1 located on the side away from the bus bar 6 are away from each other.

[0071] Specifically, in this embodiment, the end of the insertion portion 102 away from the first fixing portion 101 is upturned, so that the insertion portions 102 on the two contact pieces 1 are separated from each other in a flared shape at the entrance of the insertion space. When the moving contact 7 is inserted into the insertion space, a larger docking entrance can be provided to facilitate guiding it into the insertion space.

[0072] By setting the ends of the insertion portions 102 on the two contact pieces 1 located on the side away from the bus bar 6 to be in a flared shape away from each other, the present utility model can facilitate the insertion of the moving contact 7 into the insertion space.

[0073] According to an embodiment of the present utility model, on the other hand, as Figures 6 to 11 shown, a circuit breaker plugging system is further provided, including a housing 5, the above-mentioned circuit breaker plugging device 100, a bus bar 6, and a moving contact 7. At least the circuit breaker plugging device 100 is fixedly installed in the housing 5, at least one bus bar 6 is fixedly installed in the housing 5, the bus bar 6 is connected to the contact piece 1, at least one moving contact 7 is movably arranged in the housing 5, one end of the moving contact 7 is adapted to be connected to an operating mechanism, and the other end is movably connected to the contact piece 1.

[0074] Specifically, in this embodiment, three circuit breaker plugging devices 100 are provided in the housing 5. The three circuit breaker plugging devices 100 are arranged in parallel. Three busbars 6 are fixedly installed on the housing 5 and are fixedly connected to the contact pieces 1 in the circuit breaker plugging devices 100. The other ends of the busbars 6 are adapted to be connected to a power source. Three moving contacts 7 are movably arranged in the housing 5. An operating mechanism can be installed on the housing 5. The moving contacts 7 are connected to the operating mechanism. Through the control of the operating mechanism, the moving contacts 7 can be plugged into the plugging space in the circuit breaker plugging devices 100 or disengaged from the plugging space.

[0075] In the utility model, a shrapnel 2 is arranged on one side of the two contact pieces 1 away from the busbar 6. When the moving contact 7 is plugged into the plugging space, the shrapnel 2 can provide a downward pressure on the contact piece 1 to ensure the tight connection between the contact piece 1 and the moving contact 7. At the same time, the shrapnel 2 with a sheet structure has a large heat dissipation area, which can ensure that the temperature of the shrapnel 2 will not be too high. Thus, the shrapnel 2 can provide sufficient pressing force for the contact piece 1, further ensuring the stability of the contact between the contact piece 1 and the moving contact 7, avoiding the increase of contact resistance caused by insufficient pressure between the contact piece 1 and the moving contact 7, and preventing the contact piece 1 and the moving contact 7 from overheating and burning out the housing 5, improving the service life of the circuit breaker plugging system.

[0076] In the utility model, the moving contact 7 and the contact piece 1 of the circuit breaker plugging device 100 are tightly engaged and have a large contact area, which can effectively save the material of the contact piece 1.

[0077] The rated current of the circuit breaker plugging device 100 with an insertion type connection can meet 16A to 63A. The circuit breaker plugging device 100 is of a single-pole design and can be modularly assembled to meet the needs of different circuit breakers in the market.

[0078] In one embodiment, as Figure 10 shown, the moving contact 7 has an S-shaped structure. One end of the moving contact 7 is adapted to be movably plugged between the two contact pieces 1, and the other end of the moving contact 7 is provided with a limiting portion 701, and the limiting portion 701 is adapted to be in limit clamping connection with the operating mechanism.

[0079] Specifically, in this embodiment, two mounting holes are provided on the moving contact 7 for fixedly connecting with the operating mechanism. A limiting portion 701 is provided at one end of the moving contact 7 away from the connection with the contact piece 1, and a limiting protrusion is provided on the limiting portion 701 for limit clamping connection with the operating mechanism.

[0080] In one embodiment, as Figure 8 shown, a plurality of mounting cavities 501 are provided on the housing 5, and the busbars 6, the circuit breaker plugging devices 100 and the moving contacts 7 are correspondingly arranged in the mounting cavities 501.

[0081] Specifically, in this embodiment, three mounting cavities 501 are provided on the housing 5, and the three circuit breaker plugging devices 100 are respectively mounted in the mounting cavities 501. The three moving contacts 7 are movably located in the mounting cavities 501 and are correspondingly arranged with the circuit breaker plugging devices 100. The busbar 6 is fixedly mounted in the mounting cavities 501.

[0082] In one embodiment, as Figure 11 shown, the busbar 6 is L-shaped. The housing 5 is provided with an opening 502 at the position of the mounting cavity 501, and the busbar 6 at the opening 502 is adapted to be connected to a power source.

[0083] Specifically, as Figure 9 shown, in this embodiment, the housing 5 is provided with an opening 502 at the position of the mounting cavity 501 on the back. When the busbar 6 is mounted in the mounting cavity 501, the end away from the contact piece 1 is located at the opening 502.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A circuit breaker plug-in device, characterized in that: include: Contact pieces (1), wherein two of the contact pieces (1) are symmetrically arranged on both sides of an end of a busbar (6), and a plug-in space is formed between the two contact pieces (1), wherein the plug-in space is suitable for installing a moving contact (7); A spring sheet (2), the spring sheet (2) being in a sheet-like structure, and two spring sheets (2) being arranged on a side of the contact sheet (1) away from the busbar (6); A pressure plate (3), wherein the two pressure plates (3) are arranged on a side of the spring sheet (2) away from the contact sheet (1).

2. The circuit breaker plug-in device according to claim 1, characterized in that: The contact piece (1) comprises a first fixing portion (101) and a plug-in portion (102), wherein the first fixing portion is adapted to be fixedly connected to the busbar (6), and a plurality of plug-in portions (102) arranged at intervals are connected to the first fixing portion (101); The spring sheet (2) comprises a second fixing portion (201) and an elastic portion (202), the second fixing portion is fixedly connected to the first fixing portion (101), and a plurality of elastic portions (202) arranged at intervals are in abutment with the plug-in portion (102); The pressing plate (3) comprises a third fixing portion (301) and a crimping portion (302); the third fixing portion (301) is fixedly connected to the second fixing portion (201); and a plurality of crimping portions (302) arranged at intervals are in abutment with the elastic portion (202).

3. The circuit breaker plug-in device according to claim 2, characterized in that: The first fixing portion (101) is provided with a first mounting hole (103), the second fixing portion (201) is provided with a second mounting hole (203), the third fixing portion (301) is provided with a third mounting hole (303), and fasteners (4) are installed in the first mounting hole (103), the second mounting hole (203) and the third mounting hole (303).

4. The circuit breaker plug-in device according to claim 2, characterized in that: A groove (104) is provided at a connection point between the adjacent plug-in portion (102) and the first fixing portion (101).

5. The circuit breaker plug-in device according to claim 2, characterized in that: The plug-in portion (102) is provided with a bending portion (105), and the bending portion (105) is connected to the fixing portion.

6. The circuit breaker plug-in device according to any one of claims 2 to 5, characterized in that: The plug-in portions (102) on the two contact pieces (1) are located at ends away from the busbar (6) and are spaced apart from each other.

7. A circuit breaker plug-in system, characterized in that: include: Housing (5); The circuit breaker plug-in device (100) according to any one of claims 1 to 6, wherein at least one of the circuit breaker plug-in devices (100) is fixedly installed in the housing (5); A busbar (6), at least one of the busbars (6) being fixedly mounted in the housing (5), and the busbar (6) being connected to the contact piece (1); A moving contact (7), at least one of the moving contacts (7) is movably arranged in the housing (5), one end of the moving contact (7) is suitable for being connected to an operating mechanism, and the other end is movably connected to the contact piece (1).

8. The circuit breaker plug-in system according to claim 7, characterized in that: The movable contact (7) has an S-shaped structure, one end of the movable contact (7) is suitable for being movably inserted between the two contact pieces (1), and the other end of the movable contact (7) is provided with a limiting portion (701), and the limiting portion (701) is suitable for being limitedly engaged with an operating mechanism.

9. The circuit breaker plug-in system according to claim 7 or 8, characterized in that: The housing (5) is provided with a plurality of installation cavities (501), and the busbar (6), the circuit breaker plug-in device (100) and the moving contact (7) are correspondingly arranged in the installation cavities (501).

10. The circuit breaker plug-in system according to claim 9, characterized in that: The busbar (6) is L-shaped, and the housing (5) is provided with an opening (502) located at the installation cavity (501), and the busbar (6) located at the opening (502) is suitable for being connected to a power source.

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