CN216015242U

CN216015242U - Moulded case circuit breaker, plug-in assembly, switching device

Info

Publication number: CN216015242U
Application number: CN202121899778.2U
Authority: CN
Inventors: 刘昕栩; 冯伟通; 刘响荣
Original assignee: Zhejiang Shilong Electric Technology Co ltd; Golden Triangle Electric Power Technology Co ltd
Current assignee: Zhejiang Shilong Electric Technology Co ltd; Golden Triangle Electric Power Technology Co ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-03-11
Anticipated expiration: 2031-08-13

Abstract

The utility model provides a molded case circuit breaker, a plug-in assembly and a switch device, wherein the molded case circuit breaker comprises: the circuit breaker body to and locate circuit breaker body wiring end, and along its width direction interval distribution's a plurality of first electrically conductive pieces, first electrically conductive piece be suitable for with grafting subassembly fixed connection, the grafting subassembly be suitable for with female the arranging peg graft, the grafting subassembly has the first slot that supplies female row elasticity male, first slot extends along the direction of keeping away from the circuit breaker body. Because the plug-in component of the inlet wire end of the circuit breaker body can be directly plugged with the busbar in the drawer cabinet, the number of the switching copper bars and the number of the switching plugs is reduced, and the number of the bolt connecting components among the components is also reduced, so that the production cost and the temperature rise are reduced; in addition, first slot extends along the direction of keeping away from the circuit breaker body for female arranging can extend outwards, has increased heat radiating area, and the radiating effect is better like this, has consequently reduced the temperature rise of circuit breaker and drawer cabinet by a wide margin.

Description

Moulded case circuit breaker, plug-in assembly, switching device

Technical Field

The utility model relates to the technical field of molded case circuit breakers, in particular to a molded case circuit breaker, a plug-in assembly and a switch device.

Background

The molded case circuit breaker is one of circuit breakers, can automatically cut off current after the current exceeds a trip setting, has the protection functions of overload long delay, short circuit instantaneous action and the like, and can be matched with module units such as a leakage device, a measuring mechanism, an electric operating mechanism and the like for use.

At present, moulded case circuit breaker all adopts bolted connection's mode to link to each other with the switching copper bar, and current many cubical switchboard are for having the drawer cabinet of quick grafting function, install the circuit breaker in the drawer of drawer cabinet, because the circuit breaker adopts bolt-up's mounting means to link to each other with the switching copper bar, switching copper bar rethread switching plug links to each other with the outer female row of wiring of drawer, the switching point is more like this, the temperature rise, and the assembly is loaded down with trivial details, consequently, urgent need the utility model relates to a moulded case circuit breaker who is applicable to the drawer cabinet, can arrange the realization of pegging graft fast with the wiring.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects that the molded case circuit breaker in the prior art cannot be directly and rapidly plugged with the busbar in the drawer cabinet, and has multiple switching points, complex assembly and poor heat dissipation effect, thereby providing the molded case circuit breaker, the plugging assembly and the switch device which are rapidly and conveniently assembled and are used for rapidly plugging the wiring busbar in the drawer cabinet.

Therefore, the utility model provides a molded case circuit breaker, which comprises a circuit breaker body and a plurality of first conductive pieces arranged on a wiring end of the circuit breaker body and distributed at intervals along the width direction of the circuit breaker body, wherein the first conductive pieces are suitable for being fixedly connected with an inserting assembly, the inserting assembly is suitable for being inserted into a bus bar, each first conductive piece comprises a first connecting plate and a second connecting plate, the second connecting plate is suitable for being connected with a contact plate inside the circuit breaker body, the first connecting plate extends along the height direction of the circuit breaker body and is assembled with the inserting assembly through a fastening assembly, the inserting assembly is provided with a first slot for the bus bar to be elastically inserted into, and the first slot extends along the direction far away from the circuit breaker body.

One end, far away from the second connecting plate, of the first connecting plate is provided with a third connecting plate connected with the second connecting plate in a bent mode, the third connecting plate extends in the height direction of the breaker body and is assembled with the plug-in assembly through a fastening assembly, and the two adjacent third connecting plates of the first conductive pieces are located in two different vertical planes respectively.

The circuit breaker body is provided with a first limiting structure which is suitable for limiting the inserting assembly when the busbar is inserted into or pulled out of the inserting assembly, and/or a second limiting structure which is suitable for limiting the position of the first conductive piece.

Be equipped with the confession on the first panel of one side of circuit breaker body first electrically conductive stretch out in order with the first opening of grafting subassembly assembly, first limit structure includes: at least one lug is arranged on the edge of the plug-in component and is suitable for abutting against the first panel when the mother board is plugged in.

First limit structure still includes: the first baffle block is arranged on one side, away from the convex block, of the first panel and is suitable for abutting against the convex block when the busbar is pulled out.

The first stop block is provided with a second opening which is arranged adjacent to the first stop block and can be used for the lug to be inserted or penetrated out, the inserting component is provided with an assembling position where the lug abuts against the first stop block, and a disassembling position where the lug is separated from the first stop block and can be penetrated out from the second opening.

At least one lug is arranged on each of two sides of the plug-in component, and the first baffle block which is correspondingly abutted against the lug is arranged on the first panel.

The second limit structure comprises: and the second stop block is arranged on the circuit breaker body or the first panel and can be abutted against the first surface of the first conductive piece, which is far away from the plug-in assembly.

The second limit structure further comprises: and the third stop block is arranged on the circuit breaker body or the first panel and can be abutted against the second surface, adjacent to the plug-in assembly, of the first conductive piece.

The plurality of plug-in components are distributed in an oblique line shape or a triangle shape.

The plug-in assembly is suitable for being assembled with the breaker body of the molded case circuit breaker.

The plug-in component comprises a plug-in connector and an elastic piece, the plug-in connector is provided with a plug-in main body and two fourth connecting plates connected with the plug-in main body, and the two fourth connecting plates are opposite to each other to form a first slot for a busbar to be inserted; and the elastic piece is arranged on the plug connector, and the elastic piece applies elastic acting force which is abutted against the busbar towards the fourth connecting plate.

The elastic part is a split ring with a notch, and two sides of the notch of the split ring are respectively provided with an elastic arm which elastically abuts against the corresponding fourth connecting plate.

The plug connector with be equipped with first limit structure between the first panel of one side of circuit breaker body, first limit structure includes: the at least one lug is arranged on the edge of the plug connector; at least one first stop block is arranged on one side, far away from the convex block, of the first panel, and a second slot for the convex block to insert is formed between the first stop block and the first panel.

The switch device comprises the molded case circuit breaker and the plug-in assembly assembled with the molded case circuit breaker.

The technical scheme of the utility model has the following advantages:

1. the molded case circuit breaker comprises a circuit breaker body and a first conductive piece, wherein the first conductive piece is suitable for being plugged with a corresponding bus bar through a plugging component, the plugging component is provided with a first slot for the elastic insertion of the bus bar, and the plugging component of the wire inlet end of the circuit breaker body can be directly plugged with the bus bar in the drawer cabinet, so that the number of the switching copper bars and the number of the switching plugs is reduced, and the number of bolt connecting components among the components is also reduced, thereby reducing the production cost and the temperature rise; in addition, the first slot extends along the direction far away from the circuit breaker body, so that the bus bar can extend outwards, the heat dissipation area is increased, the heat dissipation effect is better, and the temperature rise of the circuit breaker and the drawer cabinet is greatly reduced; in addition, a plurality of first electrically conductive piece along the width direction interval distribution of circuit breaker body, and first connecting plate all extends along the direction of height of circuit breaker body, and the copper product quantity of first electrically conductive piece is little like this, has the advantage that the temperature rise is low, with low costs.

2. According to the molded case circuit breaker provided by the utility model, the two third connecting plates of the two adjacent first conductive pieces are respectively positioned in two different vertical planes, so that the creepage distance between the two adjacent third connecting plates and the two adjacent plug-in assemblies is increased, and the safety and reliability are improved.

3. According to the molded case circuit breaker provided by the utility model, the circuit breaker body is provided with the first limiting structure suitable for limiting the position of the plug-in assembly when the bus bar is plugged with the plug-in assembly, and/or the second limiting structure suitable for limiting the position of the first conductive piece.

4. According to the molded case circuit breaker provided by the utility model, the edge of the plug-in assembly is provided with the convex block, and the convex block is suitable for abutting against the first panel when the bus bar is inserted, so that the situation that the bus bar cannot be inserted into the first slot of the plug-in assembly due to the fact that the plug-in assembly moves along the bus bar in the same direction is avoided; the first baffle block is arranged on one side of the first panel, which is far away from the convex block, and the first baffle block is suitable for abutting against the convex block when the bus bar is pulled out, so that the bus bar is prevented from being difficult to pull out from the first slot because the plug-in assembly moves along the bus bar in the same direction; the mutually matched convex block and the first stop block have the advantage of simple structure.

5. The first stop block is provided with a second opening which is arranged adjacent to the first stop block and through which the lug can be inserted or penetrated, and the plug-in assembly is provided with an assembling position at which the lug abuts against the first stop block and a disassembling position at which the lug is separated from the first stop block and can penetrate out of the second opening. Through setting up the second opening to be favorable to grafting subassembly and circuit breaker body to realize quick assembly disassembly.

6. According to the molded case circuit breaker provided by the utility model, the second stop block and the third stop block are arranged on the two sides of the first conductive piece, so that the position of the first conductive piece is limited, and the first conductive piece and the plug-in assembly are fixed, namely the position of the plug-in assembly is limited, so that the plugging reliability is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a perspective view of a first embodiment of a molded case circuit breaker of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a perspective view of the cover plate of FIG. 1;

FIG. 4 is a perspective view of a first embodiment of a plurality of first electrically conductive members;

FIG. 5 is a schematic structural diagram of a first conductive member;

FIG. 6 is a perspective view of a second embodiment of a plurality of first electrically conductive members;

fig. 7 is a sectional view of a second embodiment of the molded case circuit breaker of the present invention;

fig. 8 is an assembled cross-sectional view of the molded case circuit breaker and the plug assembly of fig. 7;

fig. 9 is a perspective view of a cover plate in a third embodiment of the molded case circuit breaker according to the present invention;

FIG. 10 is a perspective view of the plug assembly;

FIG. 11 is a front view of the plug assembly;

FIG. 12 is a side view of the plug assembly;

FIG. 13 is a perspective view of the switching device of the present invention;

FIG. 14 is an exploded view of the switchgear;

FIG. 15 is a side view of FIG. 13;

FIG. 16 is an enlarged view of a portion of FIG. 15;

fig. 17 is a schematic structural view of a 4P molded case circuit breaker.

Description of reference numerals:

1. a circuit breaker body; 2. a first conductive member; 3. a first connecting plate; 4. a second connecting plate; 5. a third connecting plate; 6. a contact plate; 7. a first slot; 8. a first panel; 9. a first opening; 10. a bump; 11. A first stopper; 12. a second opening; 13. a second stopper; 14. a third stopper; 15. a plug-in unit; 16. A plug-in main body; 17. a fourth connecting plate; 19. an elastic member; 20. a resilient arm; 21. a second slot; 22. And (7) a cover plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the switch device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a molded case circuit breaker, as shown in fig. 1 to 3, including a circuit breaker body 1, a first conductive member 2, and a cover plate 22.

Three first conductive members 2 are provided, as shown in fig. 1, 4 and 5, and are disposed at a wiring end of the circuit breaker body 1 and distributed at intervals along a width direction (X-axis direction) of the circuit breaker body, the first conductive members 2 are adapted to be fixedly connected with an insertion assembly adapted to be inserted into a bus bar, the first conductive members 2 include a first connecting plate 3, and a second connecting plate 4 and a third connecting plate 5 respectively disposed at two ends of the first connecting plate 3, the first connecting plate 3 extends along a height direction (Z-axis direction) of the circuit breaker body 1, the second connecting plate 4 is adapted to be inserted into the circuit breaker body 1 and is integrally bent and connected with a contact plate 6 inside the circuit breaker body 1, a stationary contact is disposed on the contact plate 6, and the third connecting plate 5 is integrally bent and connected with the first connecting plate 3, and extend along the direction of height of circuit breaker body 1, adjacent two third connecting plates 5 of first electrically conductive piece 2 are located two different vertical planes respectively to the creepage distance between two adjacent third connecting plates 5 and two adjacent grafting subassemblies has been increased. In this embodiment, the fastening member may be a bolt or a rivet. The first connecting plates 3 of the three first conductive pieces 2 are all located in the same first vertical plane, and the third connecting plates 5 are all located in the same second vertical plane. As shown in fig. 1, the breaker body 1 has a width direction extending along the X axis, a length direction extending along the Y axis, and a height direction extending along the Z axis.

In an alternative embodiment, the three third connecting plates 5 have the same height.

As an alternative embodiment, as shown in fig. 6, the first conducting member 2 comprises only a first connecting plate 3 and a second connecting plate 4, the first connecting plate 3 being adapted to be assembled with a plug assembly.

Breaker body 1 is equipped with on it and is suitable for female arranging with during the plug-in components plug, injectd the first limit structure of plug-in components position, one side of breaker body 1 is equipped with apron 22 rather than the lock is connected, and apron 22 encloses with breaker body 1 and closes the holding chamber that forms to be suitable for the first electrically conductive piece 2 of installation, and apron 22 is kept away from and is equipped with the confession on the first panel 8 of breaker body 1 the third connecting plate 5 stretch out with the first opening 9 of plug-in components assembly. As shown in fig. 2, 3 and 16, the first stopper structure includes: the four bumps 10 are respectively arranged on the edges of the two sides of the plug-in component; two first stoppers 11 respectively disposed at two sides of the first opening 9, wherein the first stoppers 11 and the first panel 8 are opposite to each other to form a second slot 21 into which the bump 10 is inserted. The first block 11 has a second opening 12 disposed adjacent thereto for the protrusion 10 to be inserted into or pass through, and the plug assembly has an assembly position where the protrusion 10 abuts against the first block 11, and a disassembly position where the protrusion 10 is separated from the first block 11 and can pass through the second opening 12. The circuit breaker body 1 is provided with three plug-in components which are distributed in an oblique line shape or a triangle shape. It should be noted that the molded case circuit breaker may be a 3P circuit breaker as shown in fig. 13, or may be a 4P circuit breaker as shown in fig. 17.

Example 2

The present embodiment provides a molded case circuit breaker, as shown in fig. 7 and 8, including a circuit breaker body 1, a first conductive member 2, and a cover plate 22.

The circuit breaker body 1 is provided with a second limiting structure suitable for the position of the first conductive piece 2 when the plug-in assembly is plugged, a cover plate 22 connected with the lock is arranged on one side of the circuit breaker body 1, the cover plate 22 and the circuit breaker body 1 are enclosed to form an accommodating cavity suitable for installing the first conductive piece 2, and a first panel 8 of the circuit breaker body 1 far away from the cover plate 22 is provided with a third connecting plate 5 extending out and a first opening 9 assembled with the plug-in assembly. As shown in fig. 7 and 8, the second limiting structure includes two second stoppers 13 and two third stoppers 14, the second stoppers 13 and the third stoppers 14 are respectively disposed on two sides of the third connecting plate, the second stoppers 13 can abut against the first surface of the first conductive member 2 away from the plug-in assembly, and the third stoppers 14 abut against the second surface of the first conductive member 2 adjacent to the plug-in assembly. The circuit breaker body 1 is provided with three plug-in components which are distributed in an oblique line shape or a triangle shape.

Example 3

The present embodiment provides a molded case circuit breaker, as shown in fig. 1 and 9, including a circuit breaker body 1, a first conductive member 2, and a cover plate 22.

Breaker body 1, be equipped with on the breaker body 1 be suitable for female arranging with during the plug-in components plug, inject plug-in components's first limit structure, and inject first electrically conductive second limit structure of 2 positions, one side of breaker body 1 is equipped with apron 22 rather than the lock connection, and apron 22 encloses with breaker body 1 and closes the holding chamber that forms to be suitable for the first electrically conductive 2 of installation, and apron 22 is kept away from and is equipped with the confession on the first panel 8 of breaker body 1 third connecting plate 5 stretches out with the first opening 9 of plug-in components assembly. The circuit breaker body 1 is provided with three plug-in components which are distributed in an oblique line shape or a triangle shape.

As shown in fig. 2, 3 and 16, the first stopper structure includes: the four bumps 10 are respectively arranged on the edges of the two sides of the plug-in component; two first stoppers 11 respectively disposed at two sides of the first opening 9, wherein the first stoppers 11 and the first panel 8 are opposite to each other to form a second slot 21 into which the bump 10 is inserted. The first block 11 has a second opening 12 disposed adjacent thereto for the protrusion 10 to be inserted into or pass through, and the plug assembly has an assembly position where the protrusion 10 abuts against the first block 11, and a disassembly position where the protrusion 10 is separated from the first block 11 and can pass through the second opening 12.

As shown in fig. 7 and 8, the second limiting structure includes two second stoppers 13 and two third stoppers 14, the second stoppers 13 and the third stoppers 14 are respectively disposed on two sides of the third connecting plate, the second stoppers 13 can abut against the first surface of the first conductive member 2 away from the plug-in assembly, and the third stoppers 14 abut against the second surface of the first conductive member 2 adjacent to the plug-in assembly.

Example 4

The present embodiment provides a plug assembly adapted to be assembled with a circuit breaker body 1 of a molded case circuit breaker, as shown in fig. 9 to 11, the plug assembly including a plug 15 and an elastic member 19.

The plug connector 15 is provided with a plug main body 16 and two fourth connecting plates 17 connected with the plug main body 16, a through hole for a bolt to penetrate through is formed in the middle of the plug main body 16, two sides of the plug main body 16 are respectively provided with a convex block 10 extending outwards, a first stop block 11 is arranged on a first panel 8 of a cover plate 22, and a second slot 21 for the convex block 10 to insert is formed between the first stop block 11 and the first panel 8; two the fourth connecting plate 17 relatively forms the first slot 7 that supplies female arranging to insert, and the junction shaping of fourth connecting plate 17 and grafting main part 16 has the perforation that supplies elastic component 19 to wear to establish.

And the elastic piece 19 is arranged on the plug connector 15, and the elastic piece 19 applies elastic acting force which is abutted against the busbar to the fourth connecting plate 17. In this embodiment, the elastic member 19 is an open ring having a notch, and two sides of the notch of the open ring are respectively provided with an elastic arm 20 elastically abutting against the corresponding fourth connecting plate 17. The outer side surface of the fourth connecting plate 17 is formed with a groove into which the end of the elastic arm 20 is inserted and whose moving position is restricted.

Example 5

The present embodiment provides a switching apparatus, as shown in fig. 13 to 16, including a molded case circuit breaker, and a plug assembly assembled with the molded case circuit breaker.

A molded case circuit breaker includes a breaker body 1, a first conductive member 2, and a cover plate 22.

Breaker body 1 is equipped with on it and is suitable for female arranging with when the plug component plug, injectd plug component's first limit structure, and injectd the second limit structure of first electrically conductive 2 positions, one side of breaker body 1 is equipped with apron 22 rather than the lock connection, and apron 22 encloses with breaker body 1 and closes the holding chamber that forms to be suitable for the first electrically conductive 2 of installation, and apron 22 is kept away from and is equipped with the confession on the first panel 8 of breaker body 1 the third connecting plate 5 stretch out with the first opening 9 of plug component assembly. The circuit breaker body 1 is provided with three plug-in components which are distributed in an oblique line shape or a triangle shape.

A plug assembly adapted to be assembled with a circuit breaker body 1 of a molded case circuit breaker, as shown in fig. 10 to 12, the plug assembly including a plug 15 and an elastic member 19.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A molded case circuit breaker, comprising:

circuit breaker body (1), and locate circuit breaker body (1) wiring end, and along its width direction interval distribution's a plurality of first electrically conductive (2), first electrically conductive (2) be suitable for with grafting subassembly fixed connection, the grafting subassembly is suitable for with female the arranging grafting, first electrically conductive (2) include first connecting plate (3) and second connecting plate (4), second connecting plate (4) be suitable for with circuit breaker body (1) inside contact board (6) link to each other, first connecting plate (3) are followed the direction of height of circuit breaker body (1) extends, and through fastening components with the grafting subassembly assembly, the grafting subassembly has the confession female first slot (7) of arranging elastic insertion, first slot (7) are along keeping away from the direction of circuit breaker body (1) extends.

2. A molded case circuit breaker according to claim 1, wherein one end of the first connecting plate (3) away from the second connecting plate (4) is provided with a third connecting plate (5) connected with the second connecting plate in a bending manner, the third connecting plate (5) extends along the height direction of the circuit breaker body (1) and is assembled with the plug assembly through a fastening assembly, and two third connecting plates (5) of two adjacent first conductive members (2) are respectively located in two different vertical planes.

3. A molded case circuit breaker according to claim 1 or 2, wherein the circuit breaker body (1) is provided with a first limiting structure adapted to limit the position of the plug assembly when the busbar is plugged into or pulled out of the plug assembly, and/or a second limiting structure adapted to limit the position of the first conductive member (2).

4. A molded case circuit breaker according to claim 3, wherein a first opening (9) for the first conductive member (2) to extend out for assembling with the plug assembly is provided on a first panel (8) on one side of the circuit breaker body (1), and the first limiting structure comprises:

at least one lug (10) is arranged at the edge of the plug-in assembly, and the lug (10) is suitable for abutting against the first panel (8) when the female row is plugged in.

5. A molded case circuit breaker according to claim 4, wherein said first limit structure further comprises:

the first stop block (11) is arranged on one side, far away from the convex block (10), of the first panel (8), and the first stop block (11) is suitable for abutting against the convex block when the busbar is pulled out.

6. A molded case circuit breaker according to claim 5, wherein the first stopper (11) has a second opening (12) provided adjacent thereto for the insertion or the penetration of the projection (10), the plug-in assembly has an assembled position in which the projection (10) abuts against the first stopper (11), and a disassembled position in which the projection (10) is separated from the first stopper (11) and is penetrated through the second opening (12).

7. A molded case circuit breaker according to claim 5, wherein the plug-in assembly is provided with at least one protrusion (10) on each side, and the first panel (8) is provided with the first stopper (11) corresponding to and abutting against the protrusion (10).

8. A molded case circuit breaker according to claim 3, wherein the second limit structure comprises:

and the second stop block (13) is arranged on the circuit breaker body (1) or the first panel (8) and can be abutted against the first surface, far away from the plug-in assembly, of the first conductive piece (2).

9. A molded case circuit breaker according to claim 3, wherein the second limit structure further comprises:

and the third stop block (14) is arranged on the circuit breaker body (1) or the first panel (8) and can be abutted against the second surface, adjacent to the plug-in assembly, of the first conductive piece (2).

10. A plug assembly adapted to be assembled with a circuit breaker body (1) of a molded case circuit breaker according to any one of claims 1 to 8.

11. The plug assembly of claim 10, wherein the plug assembly comprises:

the plug connector (15) is provided with a plug main body (16) and two fourth connecting plates (17) connected with the plug main body (16), and the two fourth connecting plates (17) are opposite to form a first slot (7) for a busbar to be inserted;

and the elastic piece (19) is arranged on the plug connector (15), and the elastic piece (19) exerts an elastic acting force which is abutted against the busbar towards the fourth connecting plate (17).

12. Plug assembly according to claim 11, characterized in that the elastic element (19) is a split ring with a notch, on each side of which there is an elastic arm (20) elastically abutting against the corresponding fourth connecting plate (17).

13. The connector assembly of claim 11 or 12, wherein a first limit structure is provided between the connector (15) and the first panel (8) on one side of the circuit breaker body (1), and the first limit structure comprises:

at least one lug (10) arranged on the edge of the plug connector (15);

at least one first stop block (11) is arranged on one side, far away from the bump (10), of the first panel (8), and a second slot (21) for inserting the bump (10) is formed between the first stop block (11) and the first panel (8).

14. A switchgear comprising the molded case circuit breaker according to any one of claims 1 to 9, and the plug-in assembly assembled with the molded case circuit breaker according to any one of claims 10 to 13.