CN215496566U - Plug-in base of molded case circuit breaker - Google Patents

Abstract

The invention provides a plug-in base of a molded case circuit breaker. The molded case circuit breaker can be connected with and disconnected from an electric circuit in a plugging mode through the molded case circuit breaker. In order to realize the purpose, the plug-in base of the molded case circuit breaker is designed and comprises a plug, a fixed column, a cover, a base shell, an outer busbar, a fixed angle plate, a flexible connection, a pressing plate, a limiting rod and an elastic piece. The flexible connection and the outer bus bar are fixed to form a connector, penetrate through the shell of the mounting base and are installed in the shell of the mounting base, and the flexible connection and the outer bus bar are fastened and fixed through the cover. The flexible connection is arranged in the connector, and the flexible connection can be aligned to the connecting hole on the cover when moving up and down in the base shell through the pressure plate guide groove and the limiting feature in the pressure plate and the base shell, so that when the plug is connected with the flexible connection, the plug can be automatically adjusted to align the flexible connection, the elastic piece is pushed and compressed, clamping force is generated, and the flexible connection and the plug are tightly attached and clamped. The invention has the characteristics of reliable contact, large clamping force, large contact surface, low energy consumption, low copper consumption and the like.

Description

Plug-in base of molded case circuit breaker

Technical Field

The invention relates to a plug-in base of a molded case circuit breaker, and belongs to the technical field of switch equipment.

Background

A plug-in base in a molded case circuit breaker is a key accessory product in plug-in or draw-out switch equipment, a main circuit connector on the market at present is mainly of a linear spring coil structure, and the contact pressure between plug chucks is unstable; and the contact surface of the breaker plug and the conducting strip chuck is very small, and the contact surface is mainly in line contact, because the breaker is usually required to bear large current, and the electric repulsion generated by large current ensures that good contact pressure between the plug and the chuck must be ensured, and particularly when the breaker is applied to a motor starting scheme, the breaker needs to bear 5 times of instantaneous current of the starting current of a motor. The motor is started for 6-7 times for 20-30 seconds, the resistance value of a main circuit in plugging does not need to be greatly changed, the plugging pressure does not need to be greatly changed, and otherwise, the temperature rise can be multiplied; however, in the application of the current main circuit connector in the starting of the motor, the contact pressure between the plug chucks is unstable, so that the plug is often burnt, and the safety and the reliability of the operation of equipment are influenced.

Disclosure of Invention

The invention aims to solve the technical problem that the contact pressure between a plug and a chuck is unstable when the existing plug-in or pull-out type switch equipment is plugged.

In order to solve the above problems, the technical scheme of the invention is to provide a plug-in base of a molded case circuit breaker, which comprises a plug, a cover, a base, an outer bus, a connecting piece, an elastic connecting structure, an electric connecting assembly formed by the plug, the outer bus, a fastening device, the connecting piece and an elastic piece; the cover and base form a housing for mounting the electrical connection assembly.

Preferably, the housing has a cavity for partially accommodating the electrical connection assembly, the cavity includes a limiting structure for limiting the movement of the electrical connection assembly in the second direction, and a guiding structure for guiding the movement of the electrical connection assembly in the first direction.

Preferably, the connector is formed from a stack of layers of copper foil, the cover having a first through hole for receiving the socket therethrough, the first through hole allowing the plug to move in a first direction.

Preferably, the connecting piece also comprises a connecting piece peripheral supporting structure; the plug-in base is provided with a connecting piece peripheral supporting structure, a connecting piece is arranged in the connecting piece peripheral supporting structure, and the plug is connected with the outer bus bar through the connecting piece; the connecting piece is designed into an elastic connecting piece, and a limiting structure used for limiting the position of the elastic connecting piece is arranged on a peripheral supporting structure of the connecting piece on the periphery of the elastic connecting piece.

Preferably, a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece are arranged on the connecting piece peripheral supporting structure on the periphery of the elastic connecting piece.

Preferably, the elastic connection comprises a flexible connection plate; the flexible connecting plate comprises a flexible part, an outer busbar connecting part and a plug connecting part; a flexible part is arranged between the outer bus connecting part and the plug connecting part; an outer busbar is fixedly connected between the same ends of the two corresponding parallel flexible connecting plates far away from the plug.

Preferably, an elastic connecting structure is arranged between the flexible connecting plate and the peripheral supporting structure of the connecting piece.

Preferably, the end face of one end of the flexible connecting plate, which is close to the plug, is provided with a guide inclined plane for guiding the movement of the plug when the plug is inserted.

Preferably, the connector peripheral support structure comprises a cover and a base housing; the base shell is connected with the cover in a matching way, an elastic connecting piece is arranged in a cavity between the base shell and the cover, and a plug arranged on the outer side of the cover is connected with an outer bus bar arranged on the outer side of the base shell through the elastic connecting piece; the inner side surfaces of the base shell and the cover at the periphery of the elastic connecting piece, which correspond to each other, are provided with a limiting structure for limiting the position of the elastic connecting piece, a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece; the elastic connecting structure comprises a pressing plate, a limiting rod, a nut and an elastic piece; a limiting rod penetrates between the two parallel flexible connecting plates, pressing plates respectively penetrate through two ends, arranged on the outer sides of the two flexible connecting plates, of the limiting rod, and elastic pieces penetrate through two ends, arranged on the outer sides of the pressing plates, of the limiting rod; the end parts of the two ends of the limiting rod are provided with threads, the threads are sleeved with nuts, and the nuts are connected with the pressing plate through the elastic pieces; and the flexible connecting plate is provided with a fixed angle plate and is connected with the base shell through the fixed angle plate.

Preferably, bosses are arranged at two ends of the pressure plate, which are perpendicular to the plug insertion direction; the bosses are arranged on the outer sides of the two sides of the flexible connecting plate in the width direction; the inner side surface of the cavity between the base shell and the cover is provided with a guide groove for limiting the position of the pressure plate boss, and the width of the guide groove is larger than the thickness of the pressure plate boss.

Preferably, the elastic connecting structure comprises a limiting rod, an elastic piece and a nut; a limiting rod penetrates between the two parallel flexible connecting plates, and elastic pieces penetrate through two ends of the limiting rod, which are arranged on the outer sides of the two flexible connecting plates; a fixing piece is arranged at one end part of the limiting rod and is connected with the flexible connecting plate through the elastic piece; the other end of the limiting rod is provided with a thread, a nut is sleeved on the thread, and the nut passes through the elastic piece and is connected with the soft connecting plate.

Preferably, the elastic connection structure comprises an elastic member; a boss for installing an elastic part is arranged on the peripheral supporting structure of the connecting part; and an elastic piece is arranged between the back surfaces of the corresponding surfaces of the two corresponding parallel soft connecting plates and the peripheral supporting structure of the connecting piece.

Compared with the prior art, the invention has the following beneficial effects:

the invention solves the problems of unreliable contact, high energy consumption and high temperature rise caused by inaccurate plug alignment, small clamping force and small contact area in the conventional switch equipment structure. The invention not only reduces the contact internal resistance, but also can bear the electric repulsion force of large current, and has the advantages of high reliability, low energy consumption, long service life, excellent temperature rise performance, low copper consumption and the like.

Drawings

Fig. 1 is a schematic view of a molded case circuit breaker plug-in base according to the present invention;

fig. 2 is a schematic view of an elastic connection member of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 3 is a schematic structural view of a flexible connection board of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 4 is a schematic structural diagram of a limiting rod of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 5 is a schematic structural view of a pressing plate of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 6 is a schematic structural diagram of an external bus bar of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 7 is a schematic structural view of a fixing angle plate of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 8 is a schematic structural view of a cover of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 9 is a schematic view of a base housing of a molded case circuit breaker plug-in base according to the present invention;

fig. 10 is a schematic view of a plug-in base of a molded case circuit breaker according to the present invention;

fig. 11 is a schematic view of an elastic member of a plug-in type base of a molded case circuit breaker according to the present invention;

fig. 12 is a schematic view of an elastic connection member and a connection member peripheral support structure of a molded case circuit breaker plug-in base according to a second embodiment of the present invention;

fig. 13 is a schematic view of an elastic connection member and a connection member peripheral support structure of a molded case circuit breaker plug-in base according to a third embodiment of the present invention;

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:

as shown in fig. 1 to 13, the present invention provides a plug-in base of a molded case circuit breaker, including a plug 1, a connector 11, a connector periphery support structure 12, and an outer bus bar 5; a connecting piece peripheral supporting structure 12 is arranged on the plug-in base, a connecting piece 11 is arranged in the connecting piece peripheral supporting structure 12, and the plug 1 is connected with the outer bus bar 5 through the connecting piece 11; the connecting piece 11 is an elastic connecting piece, and a limiting structure for limiting the position of the elastic connecting piece, a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece are arranged on a connecting piece peripheral supporting structure 12 on the periphery of the elastic connecting piece. The elastic connecting piece comprises a soft connecting plate 7; the flexible connecting plate comprises a flexible part 701, an outer busbar connecting part 702 and a plug connecting part 703; a flexible part 701 is arranged between the outer bus bar connecting part 702 and the plug connecting part 703; an outer bus bar 5 is fixedly connected between the same ends of the two corresponding parallel flexible connecting plates 7 far away from the plug 1. An elastic connecting structure is arranged between the soft connecting plate 7 and the peripheral supporting structure of the connecting piece. The end face of the flexible connecting plate 7 near one end of the plug 1 is provided with a guide inclined surface 706 for guiding the movement of the plug 1 when the plug is inserted. The connector peripheral support structure comprises a cover 3 and a base housing 4; the base shell 4 is connected with the cover 3 in a matching way, an elastic connecting piece is arranged in a cavity between the base shell 4 and the cover 3, and the plug 1 arranged on the outer side of the cover 3 is connected with the outer bus bar 5 arranged on the outer side of the base shell 4 through the elastic connecting piece; the inner side faces, corresponding to the base shell 4 and the cover 3, of the periphery of the elastic connecting piece are provided with limiting structures used for limiting the position of the elastic connecting piece, the connecting effect is prevented from being influenced by the movement of the connecting piece in the second direction Y, the guide structures used for guiding the movement of the elastic connecting piece and the space used for the movement of the elastic connecting piece are used, and the movement of the connecting piece in the first direction X is allowed, so that the side of the plug 1 is adaptive to the installation deviation of the wiring device of the molded case circuit breaker. The elastic connection structure comprises a pressing plate 8, a limiting rod 9, a nut and an elastic piece 10, the limiting rod 9 penetrates between the two parallel flexible connection plates 7, the limiting rod 9 is arranged at two ends of the outer sides of the two flexible connection plates 7 and respectively penetrates through the pressing plate 8, and the elastic piece 10 penetrates through two ends of the limiting rod 9 at the outer side of the pressing plate 8; the end parts of the two ends of the limiting rod 9 are provided with threads, the threads are provided with nuts, and the nuts are connected with the pressing plate 8 through elastic pieces 10; the flexible connecting plate 7 is provided with a fixed angle plate 6, and the flexible connecting plate 7 is connected with the base shell 4 through the fixed angle plate 6. Bosses 801 are arranged at two ends of the pressure plate 8 perpendicular to the insertion direction of the plug 1; the bosses 801 are arranged on the outer sides of the two sides of the flexible connecting plate 7 in the width direction; the inner side surface of the cavity between the base shell 4 and the cover 3 is provided with a guide groove 409 for limiting the position of the pressure plate boss, and the width of the guide groove 409 is greater than the thickness of the pressure plate boss 801.

Other types of elastic connection structures include a stop rod 9, an elastic piece 10 and a nut; a limiting rod 9 penetrates between the two parallel flexible connecting plates 7, and elastic pieces 10 penetrate through two ends of the limiting rod 9, which are arranged on the outer sides of the two flexible connecting plates 7; a fixing piece is arranged at one end part of the limiting rod 9 and is connected with the flexible connecting plate 7 through an elastic piece 10; the other end of the limiting rod 9 is provided with a nut, and the nut is connected with the flexible connecting plate 7 through an elastic piece 10. The other end of the limiting rod 9 is provided with a thread, the thread is sleeved with a nut, and the nut is connected with the flexible connecting plate 7 through an elastic piece 10.

Other types of elastic attachment structures may also include elastic members 10; a boss for installing the elastic part 10 is arranged on the connecting part peripheral supporting structure 12; an elastic part 10 is arranged between the back surface of the corresponding surface of the two corresponding parallel soft connecting plates 7 and the peripheral supporting structure 12 of the connecting piece.

Example one

As shown in fig. 1 to 11, the plug-in base of the molded case circuit breaker includes a plug 1, a fixing post 2, a cover 3, a base housing 4, an outer bus bar 5, a fixing angle plate 6, a flexible connecting plate 7, a pressing plate 8, a limiting rod 9 and an elastic member 10; the flexible connecting plate 7 is fixed with the outer bus bar 5 and is arranged on the base shell 4 through a fixed angle plate 6; the limiting rod 9 penetrates through the elastic piece 10, the pressing plate 8 and the soft connecting plate 7 and is arranged in the base shell 4; a limiting rod 9 is arranged in the cover 3 and buckled with the base shell 4; the flexible connecting plates 7 can move in the base shell 4, when the plug 1 is connected with the flexible connecting plates 7 in an inserting mode, the plug 1 can be automatically adjusted and aligned to be aligned with a gap between the two flexible connecting plates 7, the plug 1 pushes and compresses the elastic pieces 10 to generate clamping force, and the flexible connecting plates 7 and the plug 1 are tightly attached and clamped. The flexible connecting plate 7 is provided with a flexible part 701 which is respectively connected with an external busbar connecting part 702 of the external busbar and a plug connecting part 703 of the plug; an outer busbar mounting hole 704 is formed in the outer busbar connecting portion 702; a plug connecting hole 705 is formed in the plug connecting part 703, and the aperture size of the plug connecting hole 705 is matched with a first cylinder 901 which is arranged on the limiting rod 9 and used for limiting the distance between the two soft connecting plates 7; the flexible connecting plate 7 is further provided with a guide inclined plane 706 for guiding the movement of the plug 1 when the plug is inserted, and a guide structure for guiding the movement of the flexible connecting plate 7 in the first direction X allows the flexible connecting plate 7 to move in the first direction X, so that the side of the plug 1 is adapted to the installation deviation of the wiring device of the molded case circuit breaker. A press plate mounting hole 802 is formed in the press plate 8, and the aperture size of the mounting hole 802 is matched with that of a second cylinder 902 arranged on the limiting rod 9; the pressing plate 8 is also provided with a boss 801 and a first side surface 8011 arranged on the boss 801, and the first side surface 8011 is matched with a pressing plate limiting rib 305 arranged on the cover 3; the second side surface 8012 arranged on the boss 801 is matched with the front and back limiting surfaces 404 of the pressing plate arranged on the base shell 4; boss plane 8013 that boss 801 was equipped with matches with the clamp plate that is equipped with on base housing 4 to spacing face 405 to the right or left, and the limit structure of restriction soft connecting plate 7 motion in second direction Y prevents that the connecting piece from influencing the connection effect in the drunkenness of second direction Y. The limiting rod 9 is provided with a first cylinder 901, and when the plug 1 is pulled out, the first cylinder 901 is tightly attached to the flexible connecting plate 7 under the driving of the elastic restoring force of the elastic piece 10; the diameter of the first cylinder 901 is larger than that of the plug connecting hole 705 on the soft connecting plate 7, and the height of the first cylinder 901 is smaller than the thickness of the plug 1 inserted into the connecting plate 101; a second cylinder 902 arranged on the limiting rod 9 penetrates through the plug connecting hole 705, the elastic piece mounting hole 1001 and the pressing plate mounting hole 802 of the soft connecting plate 7; the stop rod 9 is provided with threads 903, and the threads 903 are coupled with the nut to limit the position and compression amount of the elastic member 10. The base shell 4 is provided with an outer bus bar hole 401, the outer bus bar 5 penetrates through the outer bus bar hole 401 and is installed on the base shell 4 through an outer bus bar installing hole 402, a pin penetrates through a positioning hole 503 of the outer bus bar 5 and an outer bus bar limiting hole 403 on the base shell 4 to be fixedly connected with the base shell 4, and the outer bus bar 5 is positioned; the base shell 4 is also provided with a pressure plate guide groove 409 which is matched with the pressure plate boss 801, and the pressure plate 8 can move up and down along the notch of the pressure plate guide groove 409; the base shell 4 is also provided with a buckling groove 410 which is matched and buckled with a buckling plate 303 arranged on the cover 3 to realize the separation of all cavities; the base shell 4 is also provided with a buckle groove 411 which is matched and buckled with the buckle 304 arranged on the cover 3 to realize the buckling of the cover 3 and the base shell 4, and the cover 3 is jointed and fixed with the base shell 4 through a base limiting hole 413 and a base mounting hole 414; the base housing 4 also has heat dissipation holes 412. The cover 3 is provided with an insertion connection hole 301, and the plug 1 can pass through the insertion connection hole 301; the cover 3 is further provided with a cover limiting hole 302, the limiting rod 9 passes through the cover limiting hole 302 and the base limiting hole 413, the relative position of the cover 3 and the base shell 4 is limited, the cover 3 and the base shell 4 are buckled and clamped through a buckling plate 303 and a buckling buckle 304, and the cover 3 is fixedly connected with the base shell 4 through a cover 3 mounting hole 306. The distance between the pressing plate upward and downward first stopper surface 406 and the pressing plate upward and downward second stopper surface 407 adjacent to the pressing plate guide groove 409 of the base housing 4 is smaller than the sum of the thicknesses of the flexible connecting plate 7 and the plug-in connecting plate 101 of the plug 1.

Example two

As shown in fig. 12, the plug-in base of the molded case circuit breaker includes a plug 1, a connector 11, a connector periphery support structure 12, and an outer bus bar 5; a connecting piece peripheral supporting structure 12 is arranged on the plug-in base, a connecting piece 11 is arranged in the connecting piece peripheral supporting structure 12, and the plug 1 is connected with the outer bus bar 5 through the connecting piece 11; the connecting piece 11 is an elastic connecting piece, a limiting structure for limiting the position of the elastic connecting piece is arranged on a connecting piece peripheral supporting structure 12 on the periphery of the elastic connecting piece, the movement of the elastic connecting piece in the second direction Y is limited, the connecting effect is prevented from being influenced by the movement of the connecting piece in the second direction Y, and the elastic connecting piece is prevented from moving in the second direction Y. The elastic connecting piece comprises a soft connecting plate 7; the flexible connecting plate 7 comprises a flexible part 701, an outer bus connecting part 702 and a plug connecting part 703; a flexible part 701 is arranged between the outer bus bar connecting part 702 and the plug connecting part 703; an outer bus bar 5 is fixedly connected between the same ends of the two corresponding parallel flexible connecting plates 7 far away from the plug 1. An elastic connecting structure is arranged between the soft connecting plate 7 and the connecting piece peripheral supporting structure 12. The end face of one end, close to the plug, of the soft connecting plate 7 is provided with a guide inclined plane 706 for guiding the movement of the plug when the plug is inserted, and a guide structure for guiding the movement of the soft connecting plate 7 in the first direction X allows the movement of the connecting piece in the first direction X, so that the side of the plug 1 is adapted to the installation deviation of the wiring device of the molded case circuit breaker. The elastic connecting structure comprises a limiting rod 9, an elastic piece 10 and a nut; a limiting rod 9 penetrates between the two parallel flexible connecting plates 7, and elastic pieces 10 penetrate through two ends of the limiting rod 9, which are arranged on the outer sides of the two flexible connecting plates 7; a fixing piece 905 is arranged at one end of the limiting rod 9, and the fixing piece 905 is connected with the flexible connecting plate 7 through an elastic piece 10; the other end portion of the limiting rod 9 is provided with a thread 903, the thread 903 is sleeved with a nut 904, and the nut 904 is connected with the flexible connecting plate 7 through an elastic part 10.

EXAMPLE III

As shown in fig. 13, the plug-in base of the molded case circuit breaker includes a plug 1, a connector 11, a connector periphery support structure 12, and an outer bus bar 5; a connecting piece peripheral supporting structure 12 is arranged on the plug-in base, a connecting piece 11 is arranged in the connecting piece peripheral supporting structure 12, and the plug 1 is connected with the outer bus bar 5 through the connecting piece 11; the connecting piece 11 is an elastic connecting piece, and a limiting structure for limiting the position of the elastic connecting piece, a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece are arranged on a connecting piece peripheral supporting structure 12 on the periphery of the elastic connecting piece. The elastic connecting piece comprises a soft connecting plate 7; the flexible connecting plate 7 comprises a flexible part 701, an outer busbar connecting part 702 and a plug connecting part 703; a flexible part 701 is arranged between the outer bus bar connecting part 702 and the plug connecting part 703; an outer bus bar 5 is fixedly connected between the same ends of the two corresponding parallel flexible connecting plates 7 far away from the plug 1. An elastic connecting structure is arranged between the soft connecting plate 7 and the connecting piece peripheral supporting structure 12. The end face of the flexible connecting plate 7 near one end of the plug is provided with a guide inclined surface 706 for guiding the movement of the plug when the plug is inserted. The elastic connection structure includes an elastic member 10; a boss 1002 for installing an elastic part is arranged on the connecting part peripheral supporting structure 12; the elastic piece 10 is sleeved on the boss 1002 through the elastic piece mounting hole 1001, so that the elastic piece 10 is mounted between the back surfaces of the corresponding surfaces of the two corresponding parallel soft connecting plates 7 and the connecting piece peripheral supporting structure 12, and the elastic connection effect is achieved.

According to the above embodiment, the plug 1, the outer bus bar 5, the elastic connection structure, and the connecting piece 11 form an electrical connection assembly; the cover 3 and the base 4 form a shell for mounting the electrical connection assembly, a cavity for partially accommodating the electrical connection assembly is formed in the shell, a limiting structure for limiting the movement of the electrical connection assembly in the second direction Y and a guide structure for guiding the movement of the electrical connection assembly in the first direction X are included in the cavity.

The connector 11 is formed by a plurality of copper foil layers, and the cover 3 has a first through hole 307 for receiving a socket therethrough, the first through hole 307 allowing the header 1 to move in the first direction X.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims (12)

1. The utility model provides a moulded case circuit breaker bayonet base, includes plug, lid, base, outer female arranging, connecting piece, fastener, elastic component, its characterized in that:

the plug, the busbar, the fastening device, the connecting piece and the elastic piece form an electric connection assembly;

the cover and base form a housing for mounting the electrical connection assembly.

2. The molded case circuit breaker plug-in base of claim 1, wherein the housing has a cavity therein for partially receiving the electrical connection assembly, the cavity comprising a limiting structure for limiting the movement of the electrical connection assembly in the second direction, and a guiding structure for guiding the movement of the electrical connection assembly in the first direction.

3. A molded case circuit breaker plug-in base as claimed in claim 1 or 2, wherein the connector is formed by laminating a plurality of copper foils, and the cover has a first through hole for receiving the socket therethrough, the first through hole allowing the plug to move in a first direction.

4. The molded case circuit breaker plug-in base of claim 3, further comprising a connector peripheral support structure; the plug-in base is provided with a connecting piece peripheral supporting structure, a connecting piece is arranged in the connecting piece peripheral supporting structure, and the plug is connected with the busbar through the connecting piece; the connecting piece is designed into an elastic connecting piece, and a limiting structure used for limiting the position of the elastic connecting piece is arranged on a peripheral supporting structure of the connecting piece on the periphery of the elastic connecting piece.

5. The plug-in base of the molded case circuit breaker as recited in claim 4, wherein: and a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece are arranged on the connecting piece peripheral supporting structure on the periphery of the elastic connecting piece.

6. The plug-in base of a molded case circuit breaker of claim 5, wherein: the elastic connecting piece comprises a soft connecting plate; the flexible connecting plate comprises a flexible part, an outer busbar connecting part and a plug connecting part; a flexible part is arranged between the outer bus connecting part and the plug connecting part; an outer busbar is fixedly connected between the same ends of the two corresponding parallel flexible connecting plates far away from the plug.

7. The plug-in base of a molded case circuit breaker of claim 6, wherein: and an elastic connecting structure is arranged between the soft connecting plate and the peripheral supporting structure of the connecting piece.

8. The plug-in base of a molded case circuit breaker of claim 7, wherein: the end face of one end, close to the plug, of the soft connecting plate is provided with a guide inclined plane used for guiding the plug to move when the plug is inserted.

9. The molded case circuit breaker plug-in base of claim 8, wherein: the connector peripheral support structure includes a cover and a base housing; the base shell is connected with the cover in a matching way, an elastic connecting piece is arranged in a cavity between the base shell and the cover, and a plug arranged on the outer side of the cover is connected with an outer bus bar arranged on the outer side of the base shell through the elastic connecting piece; the inner side surfaces of the base shell and the cover at the periphery of the elastic connecting piece, which correspond to each other, are provided with a limiting structure for limiting the position of the elastic connecting piece, a guide structure for guiding the movement of the elastic connecting piece and a space for the movement of the elastic connecting piece; the elastic connecting structure comprises a pressing plate, a limiting rod, a nut and an elastic piece; a limiting rod penetrates between the two parallel flexible connecting plates, pressing plates respectively penetrate through two ends, arranged on the outer sides of the two flexible connecting plates, of the limiting rod, and elastic pieces penetrate through two ends, arranged on the outer sides of the pressing plates, of the limiting rod; the end parts of the two ends of the limiting rod are provided with threads, the threads are sleeved with nuts, and the nuts are connected with the pressing plate through the elastic pieces; and the flexible connecting plate is provided with a fixed angle plate and is connected with the base shell through the fixed angle plate.

10. The molded case circuit breaker plug-in base of claim 9, wherein: bosses are arranged at two ends of the pressing plate, which are vertical to the plug insertion direction; the bosses are arranged on the outer sides of the two sides of the flexible connecting plate in the width direction; the inner side surface of the cavity between the base shell and the cover is provided with a guide groove for limiting the position of the pressure plate boss, and the width of the guide groove is larger than the thickness of the pressure plate boss.

11. The molded case circuit breaker plug-in base of claim 10, wherein: the elastic connecting structure comprises a limiting rod, an elastic piece and a nut; a limiting rod penetrates between the two parallel flexible connecting plates, and elastic pieces penetrate through two ends of the limiting rod, which are arranged on the outer sides of the two flexible connecting plates; a fixing piece is arranged at one end part of the limiting rod and is connected with the flexible connecting plate through the elastic piece; the other end of the limiting rod is provided with a thread, a nut is sleeved on the thread, and the nut passes through the elastic piece and is connected with the soft connecting plate.

12. The molded case circuit breaker plug-in base of claim 8, wherein: the elastic connecting structure comprises an elastic piece; a boss for installing an elastic part is arranged on the peripheral supporting structure of the connecting part; and an elastic piece is arranged between the back surfaces of the corresponding surfaces of the two corresponding parallel soft connecting plates and the peripheral supporting structure of the connecting piece.

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