Plug-in circuit breaker

Abstract

The plug-in circuit breaker comprises a shell, one end of the shell is an operation end, the other end of the shell is provided with a wiring socket, a wiring terminal is arranged in the wiring socket, the wiring terminal comprises a conducting bar and at least two terminal assemblies which are arranged side by side at intervals, and two elastic clamping ends are formed at the two ends of each terminal assembly respectively. One end of the conducting bar is provided with at least two clamping parts which are arranged side by side at intervals, and each clamping part is clamped by one clamping end of one terminal assembly. According to the utility model, the clamping parts and the terminal assemblies of the conducting bar are arranged side by side and at intervals, the current-carrying capacity is ensured, the temperature of the connecting part can be reduced, in addition, the two clamping ends are respectively used for being plugged with the conducting bar and the external conductor, the plugging wiring of one clamping end has small influence on the other clamping end, and the reliability of the conducting bar is improved. And the wiring stability of the wiring terminal is improved, so that the use safety of the circuit breaker is ensured.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a plug-in circuit breaker. Background Art

[0002] A switchgear is a device used to close and / or disconnect one or more circuits. A plug-in circuit breaker is an important switchgear that can close, carry and disconnect currents under normal circuit conditions and can close, carry and disconnect currents under abnormal circuit conditions within a specified time. It is connected to the outside through internal terminals.

[0003] Existing plug-in bridge-type terminals are usually busbar clamps, which have a clamping end, and the electrical connection is achieved by plugging and unplugging the clamping end with an external conductive part. The other end of the terminal away from the clamping end is a connecting end, which is connected to the conductive part inside the circuit breaker. However, this type of plug-in bridge-type terminal has the following defects: First, the conductive row connected to the terminal is usually an integrated structure, which makes the temperature of the contact position too high; second, multiple plugging and unplugging can easily cause deformation of the connecting end, affecting the stability of the wiring; third, when plugging and unplugging the wiring, the deformation of the connecting end can easily cause poor contact between the terminal and the inside of the circuit breaker, affecting the normal circuit operation and the reliability and stability of the equipment; fourth, the busbar clamp is directly set on the wiring socket of the circuit breaker, and more conductive parts are exposed to the external environment, which is easily affected by external factors such as dust and moisture, resulting in problems such as poor contact or short circuit; fifth, the temperature of the terminal and the conductive plate connected to the terminal is too high, which can easily affect the performance of other components. Summary of the invention

[0004] The utility model aims to overcome at least one defect of the prior art and provide a plug-in circuit breaker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a plug-in circuit breaker, comprising a shell, one end of the shell is an operating end, the other end of the shell is provided with a wiring socket, a wiring terminal is arranged in the wiring socket, the wiring terminal comprises a conductive row and at least two terminal assemblies arranged side by side and at intervals, two ends of each terminal assembly respectively form two elastic clamping ends, one end of the conductive row is provided with at least two clamping parts arranged side by side and at intervals, and each of the clamping parts is clamped by a clamping end of a terminal assembly respectively.

[0007] Furthermore, the terminal assembly includes a bracket, on which is disposed a pair of spaced-apart spring sheets, a clamping piece is disposed between the pair of spring sheets, and the two ends of the clamping piece are respectively formed as two elastic clamping ends, each clamping end having a clamping gap for inserting the clamping part, and each clamping end is respectively connected to an adjacent spring sheet on one side facing away from the clamping gap.

[0008] Furthermore, the clamping member includes two clamping plates arranged at intervals, the middle parts of the two clamping plates respectively cooperate with the bracket to form a first fulcrum, and the gap between the two clamping plates corresponding to the first fulcrum is the smallest, so that the same end of the two clamping plates and the gap between the same end cooperate to form a clamping end, and one of the clamping ends cooperates with the clamping part to form a second fulcrum.

[0009] Further, a mutually cooperating limiting structure is provided between the clamping portion and the clamping end, and the limiting structure includes mutually cooperating limiting grooves and limiting protrusions, the limiting grooves are provided on the clamping end and / or the clamping portion, and the limiting protrusions are provided on the clamping portion and / or the clamping end.

[0010] The contact surface between the limiting groove and the limiting protrusion is an arc surface, so that the limiting protrusion rotates in the limiting groove to form a second fulcrum between the clamping end and the clamping part.

[0011] Furthermore, the conductive bar includes a plate-shaped body, the middle part of the plate-shaped body is bent at least once, so that the first end and the second end of the plate-shaped body are respectively located on two parallel planes, and the width of the first end of the plate-shaped body is greater than that of the second end of the plate-shaped body, the first end of the plate-shaped body is divided into at least two clamping parts arranged side by side and at intervals, at least one side of each clamping part protrudes from the middle of the plate surface to form an arc-shaped limiting protrusion, and the second end of the plate-shaped body is provided with at least one fixing hole.

[0012] Furthermore, an inner shell is arranged inside the outer shell, a contact mechanism electrically connected to the wiring terminal is arranged inside the inner shell, a terminal mounting groove is arranged on the outer side wall at one end of the inner shell, and each terminal mounting groove is used to set a wiring terminal corresponding to the wiring socket.

[0013] Furthermore, a wiring cavity is provided between the outer wall of the inner shell and the inner wall of the outer shell, and a terminal installation groove is formed in an area of ​​the wiring cavity close to the wiring socket.

[0014] Furthermore, a contact mechanism is arranged inside the inner shell, and a conductive plate is connected to one end of the conductive row away from the terminal assembly. The conductive plate is arranged along the wiring cavity and passes through the inner shell to be electrically connected to the contact mechanism.

[0015] Furthermore, a mutual inductor is arranged inside the inner shell, the mutual inductor is adjacent to the moving contact or the stationary contact of the contact mechanism, a wiring bank is arranged in the central hole of the mutual inductor, and the wiring bank is connected between the conductive plate and the adjacent moving contact or the stationary contact.

[0016] Furthermore, a plurality of heat dissipation holes are provided on the side wall of the housing opposite to the conductive plate.

[0017] In the plug-in circuit breaker of the utility model, the clamping part of the conductive bar and the terminal assembly are both arranged side by side and at intervals, which not only ensures the current carrying capacity but also reduces the temperature of the connection. In addition, the two clamping ends are respectively used for plugging with the conductive bar and the external conductor. The plugging and unplugging of one clamping end has little effect on the other clamping end, which is beneficial to improving the wiring stability of the terminal block, thereby ensuring the safe use of the circuit breaker.

[0018] In addition, the clamping member is formed by two clamping sheets arranged at intervals. The split structure has low requirements on the elastic force of the clamping sheets and is also conducive to forming two fulcrums.

[0019] In addition, a limiting structure is provided between the conductive bus and the clamping member to prevent the conductive bus and the clamping member from separating during the plugging and unplugging process, thereby further improving the connection stability. In particular, the contact surfaces of the limiting groove and the limiting protrusion are both arc-shaped surfaces, and the limiting protrusion can form a second fulcrum by rotating in the limiting groove.

[0020] In addition, one end of the conductive bar is divided into a plurality of spaced-apart clamping portions, and two adjacent clamping portions are separated from each other, which is beneficial to reducing the overall temperature of one end of the conductive bar.

[0021] In addition, the wiring terminals are arranged between the inner shell and the outer shell, separating the wiring terminals from other components in the circuit breaker pole, thereby preventing the heat generated by the wiring terminals from affecting the performance of other components.

[0022] In addition, the conductive plate connected between the transformer and the terminal block is arranged along the outside of the inner shell, and heat dissipation holes are opened at the positions corresponding to the conductive plates, which is conducive to cooling and prevents the high temperature of the conductive plates and the terminal blocks from affecting the performance of other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model wiring terminal;

[0024] Figure 2 It is an exploded schematic diagram of the wiring terminal of the utility model;

[0025] Figure 3 It is an exploded schematic diagram of the terminal assembly of the utility model;

[0026] Figure 4 It is a structural schematic diagram of a pair of clamping grid sheets in the utility model;

[0027] Figure 5 It is an exploded schematic diagram of the plug-in circuit breaker of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the inner shell in the utility model;

[0029] Reference numerals:

[0030] 1-conductive bar, 11-clamping part, 12-limiting protrusion, 13-fixing hole, 2-terminal assembly, 211-support frame, 212-support shaft, 220-clamping grid 220, 2201-first clamping section, 2202-second clamping section, 2203-straight section, 221-first clamping end, 222-second clamping end, 223-limiting groove, 224-assembly groove, 23-spring, 311-first end cover, 312-second end cover, 313-first side wall, 314-second side wall, 315-heat dissipation hole, 32-inner shell, 321-terminal mounting groove, 322-wiring cavity. DETAILED DESCRIPTION

[0031] The following is a further description of the specific implementation of the plug-in circuit breaker of the utility model in conjunction with the embodiments given in the accompanying drawings. The plug-in circuit breaker of the utility model is not limited to the description of the following embodiments.

[0032] The plug-in circuit breaker includes a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, each circuit breaker pole includes a pair of wiring terminals and a contact mechanism connected between the wiring terminals, one end of the shell serves as an operating end, the operating end is provided with an operating hole, an operating member connected to the operating mechanism extends out of the shell from the operating hole, the other end of the shell is provided with a wiring socket, the wiring terminal is assembled in the wiring socket, and the wiring terminal is plugged into the external conductor by plugging and unplugging the circuit breaker; the contact mechanism includes a moving contact and a stationary contact that cooperate with each other, the moving contact is connected to the operating mechanism, and the moving contact is driven by the operating mechanism to contact or separate with the stationary contact, thereby connecting or disconnecting the main line of each circuit breaker pole.

[0033] The improvement of the present application is that the terminal block includes a conductive bar 1 and at least two terminal assemblies 2 arranged side by side and at intervals, two ends of each terminal assembly 2 respectively form two elastic clamping ends, one end of the conductive bar 1 is provided with at least two clamping portions 11 arranged side by side and at intervals, each of the clamping portions 11 is clamped by a clamping end of a terminal assembly 2, and the other clamping end away from the conductive bar 1 is used for connecting to an external conductor.

[0034] In this way, the clamping portion 11 of the conductive bus 1 and the terminal assembly 2 are both arranged side by side and at intervals, which not only ensures the current carrying capacity but also reduces the temperature of the connection. In addition, the two clamping ends are respectively used to connect with the conductive bus 1 and the external conductor. The plugging and unplugging of one clamping end has less effect on the other clamping end, which is beneficial to improve the wiring stability of the terminal block, thereby ensuring the safe use of the circuit breaker.

[0035] Specifically, the terminal assembly 2 includes a bracket, on which a pair of spaced-apart spring sheets 23 are arranged, a clamping piece is arranged between the pair of spring sheets 23, and two ends of the clamping piece respectively form two elastic clamping ends, each clamping end has a clamping gap for plugging in the clamping part 11, and each clamping end is connected to an adjacent spring sheet 23 on one side facing away from the clamping gap, thereby forming an elastic clamping end.

[0036] Furthermore, the clamping member can be made of elastic material, and its structure can adopt a split structure. The clamping member includes two clamping plates arranged at intervals. The clamping plates are preferably plate-shaped structures with a certain degree of bending. The middle parts of the two clamping plates respectively cooperate with the bracket to form a first fulcrum, and the gap between the two clamping plates corresponding to the first fulcrum is minimized, so that the same end of the two clamping plates and the gap between the same ends cooperate to form a clamping end, and one of the clamping ends cooperates with the clamping portion 11 to form a second fulcrum. When the clamping portion 11 of the conductive bar 1 is plugged into the clamping end, the two clamping plates rotate around the first fulcrum, and when the external conductor is plugged into the other clamping end, the two clamping plates rotate around the second fulcrum, thereby facilitating the conductive bar 1 or the external conductive member to be clamped by the clamping end. Of course, the clamping member can be an integral structure, that is, the clamping member is formed by connecting two U-shaped clips, the opening of each U-shaped clip can be used as a clamping end, and the ends of the two U-shaped clips facing away from the openings are connected together so that the openings of the two U-shaped clips face away from each other. The integral structure of the clamping member is easier to assemble on the bracket.

[0037] Preferably, a mutually cooperating limiting structure is provided between the clamping end and the conductive bar 1, and the limiting structure includes a mutually limiting limiting groove 223 and a limiting protrusion 12, wherein the limiting groove 223 can be provided on the clamping member and / or the conductive bar 1, and the limiting protrusion 12 is provided on the conductive bar 1 and / or the clamping member, and the contact surface of the limiting groove 223 and the limiting protrusion 12 is an arc surface, so that the limiting protrusion 12 can rotate in the limiting groove 223, thereby, the limiting protrusion 12 and the limiting groove 223 can cooperate to form a second fulcrum of the clamping end and the clamping part 11. Of course, the use of an arc surface can also prevent mutual wear during the plug-in process.

[0038] Combination Figure 1-4 A specific structure of a connection terminal is provided.

[0039] like Figure 1-3As shown, the terminal block includes a conductive bar 1 and three terminal assemblies 2 of the same structure and arranged side by side at intervals. One end of the conductive bar 1 is simultaneously plugged into the three terminal assemblies 2, that is, one end of the conductive bar 1 is provided with three clamping portions 11 arranged side by side and at intervals, each clamping portion 11 is connected to the clamping end of a terminal assembly 2, and the intervals between the clamping portions 11 and the intervals between the terminal assemblies 2 are conducive to reducing the temperature of the connection, and one end of the three terminal assemblies 2 away from the conductive bar 1 corresponds to a wiring socket opened on the housing.

[0040] Combination Figure 2 A specific structure of a conductive bar 1 is provided. The conductive bar 1 includes a plate-shaped body. The middle part of the plate-shaped body is bent at least once so that the first end and the second end of the plate-shaped body are respectively located on two mutually parallel planes. In the figure, the width of the first end of the plate-shaped body is greater than that of the second end of the plate-shaped body, that is, the width of the first end of the plate-shaped body is equal to the total width of the three terminal assemblies 2. The first end of the plate-shaped body is divided into three clamping parts 11 arranged side by side. The three clamping parts 11 are separated from each other, which is beneficial to reducing the overall temperature of one end of the conductive bar 1. At least one side of each clamping part 11 protrudes from the middle of the plate surface to form an arc-shaped limiting protrusion 12. The second end of the plate-shaped body is provided with at least one fixing hole 13, and a fastener is assembled in the fixing hole 13 for fixed connection with the conductive member inside the circuit breaker.

[0041] Combination Figure 2-4 A specific structure of a terminal assembly 2 is provided, each terminal assembly 2 includes a bracket, a clamping member and a pair of spring plates 23, the pair of spring plates 23 are arranged on the bracket and are spaced apart from each other, the clamping member is arranged between the pair of spring plates 23 and the middle part of the clamping member is rotatably connected to the bracket, two clamping ends are formed at both ends of the clamping member, each clamping end has a clamping gap, one of the clamping gaps is used to be plugged into a clamping portion 11 of a conductive bar 1, and the other clamping gap is used to be connected to a conductive member outside the circuit breaker.

[0042] like Figure 3 As shown, the bracket includes two pairs of support walls arranged at intervals, and the two pairs of support walls are connected end to end in sequence to form a support frame 211 with a quadrilateral hollow area in the middle, wherein the edges of a pair of support walls extend outward to form an extension wall, and a support shaft 212 is connected between the two extension arms. A pair of spring pieces 23 pass through the hollow area. When the spring pieces 23 are deformed, the side of each spring piece 23 facing away from the support shaft 212 abuts against a support wall, and the support shaft 212 is located between the pair of spring pieces 23, and the support shaft 212 is parallel to the plane where the spring pieces 23 are located. The clamping piece passes through the hollow area and cooperates with the support shaft 212. The two clamping ends of the clamping piece extend to the outside of the two sides of the support frame 211 respectively, and the ends of each clamping end are respectively connected to a pair of spring pieces 23, so that the spring piece 23 provides elastic force for the clamping end.

[0043] like Figure 2-4 As shown, the clamping member includes two clamping plates arranged at intervals, and the middle parts of the two clamping plates respectively cooperate with the bracket to form a first fulcrum, and the gap between the two clamping plates corresponding to the first fulcrum is the smallest, so that the same end of the two clamping plates and the gap between the same end cooperate to form a clamping end, and one of the clamping ends cooperates with the clamping part 11 to form a second fulcrum.

[0044] In this embodiment, each clamping sheet is formed by a plurality of clamping grid sheets 220 arranged side by side. Figure 4 In the embodiment, the plates of two adjacent clamping grids 220 are attached to each other. Each clamping grid 220 includes two clamping sections and a straight section 2203 connected between the two clamping sections. For the convenience of description, the two clamping sections are respectively a first clamping section 2201 and a second clamping section 2202. A first groove is provided at the edge of the straight section 2203. Figure 4 In the embodiment, the first groove is closer to the second clamping section 2202, and a second groove is provided at the edge of the connection between the straight section 2203 and at least one clamping section. Figure 4 In the embodiment, the second groove is located at the junction of the straight section 2203 and the first clamping section 2201.

[0045] When the two clamping grids 220 are spaced apart and facing each other, the gap between the two straight sections 2203 is the smallest, so that the smallest gap between the middle parts of the two clamping plates is formed accordingly. The two first grooves are spaced apart to form a mounting groove 224, and the support shaft 212 is arranged in the mounting groove 224, so that the middle part of each clamping grid 220 (clamping plate) can rotate around the support shaft 212, that is, the middle part of each clamping plate cooperates with the bracket to form a first fulcrum, and the two spaced apart clamping sections and the gap between the two clamping sections form a clamping end, that is, the two first clamping sections 2201 and the gap between the two first clamping sections 2201 form the first clamping end 22 1, the first clamping end 221 has a first clamping gap, and the first clamping gap is used to plug with the clamping part 11 of the conductive bar 1, and the two second grooves are relatively formed to form a limiting groove 223, and the limiting groove 223 cooperates with the limiting protrusion 12 of the clamping part 11 to improve the connection stability. At the same time, the contact surface of the limiting groove 223 and the limiting protrusion 12 is an arc surface, and the two cooperate to form a second fulcrum between the clamping part 11 and the clamping end, and the two second clamping sections 2202 and the gap between the two second clamping sections 2202 form a second clamping end 222, and the second clamping end 222 has a second clamping gap, and the second clamping gap is used to plug with an external conductive member.

[0046] In this embodiment, the ends of the first clamping section 2201 and the second clamping section 2202 are respectively bent toward the direction close to the spring piece 23, so that the opening degree of the first clamping end 221 and the second clamping end 222 can be increased, which is convenient for plugging the conductive bar 1 and the external conductive member, and at the same time, it is also convenient for connecting with the end of the spring piece 23, so that there is a deformation space between the spring piece 23 and the clamping member. It should be noted that the clamping piece can also be a plate structure.

[0047] Another structure of a clamping member is provided (not shown), wherein the clamping member comprises two U-shaped clips, one end of the U-shaped clip is provided with an opening, and the other end of the U-shaped clip is a connecting end, the connecting ends of the two U-shaped clips are connected together to form an integral structure, and an assembly groove 224 for assembling the support shaft 212 is provided at the connection between the two connecting ends, and the opening of each U-shaped clip serves as a clamping end, and a mutually cooperating limiting structure may also be provided between one of the clamping ends and the conductive bar 1.

[0048] like Figure 1-3 As shown, each spring piece 23 is in a plate-shaped structure as a whole, and a plurality of spaced slits are provided on the edges of both ends of each spring piece 23, so that the two ends of each spring piece 23 form a comb-tooth shape, and the comb-tooth-shaped ends are connected to the clamping ends. A certain space is reserved between each spring piece 23 and the clamping piece, so that the middle part of the spring piece 23 can move toward the direction close to the clamping member to produce deformation.

[0049] like Figure 5 , 6 As shown, the plug-in circuit breaker includes a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, one end of the shell is used as an operating end, preferably, the other end of the shell opposite to the operating end is a wiring terminal, the wiring terminal is provided with at least one pair of wiring sockets, each circuit breaker pole includes a pair of wiring terminals as described above, each wiring terminal is arranged inside the shell, a clamping end of each wiring terminal away from the conductive bar 1 is abutted against the inner wall of the shell provided with the wiring socket, so that the wiring terminal is completely arranged in the shell, which can avoid excessive exposure to the external environment, avoid being affected by factors such as dust and moisture, and cause problems such as poor contact or short circuit.

[0050] In this embodiment, an inner shell 32 is arranged inside the outer shell, and the circuit breaker pole is arranged inside the inner shell 32. The outer wall at one end of the inner shell 32 is provided with a terminal mounting groove 321. Each terminal mounting groove 321 is used to set a wiring terminal corresponding to a wiring socket, wherein the end of the conductive bar 1 away from the terminal assembly 2 passes through the inner shell 32 and is electrically connected to the contact mechanism, that is, a hole for electrically connecting the conductive bar 1 to the contact mechanism is opened on the side wall of the inner shell 32.

[0051] Specifically, the housing includes a first end cover 311 and a second end cover 312 which are spaced apart. The first end cover 311 and the second end cover 312 serve as an operation end and a connection end of the housing, respectively. Two pairs of side walls are disposed between the first end cover 311 and the second end cover 312, wherein one pair of spaced apart side walls is a first side wall 313, and the other pair of spaced apart side walls is a second side wall 314. Figure 6 As shown, a wiring cavity 322 is provided between the outer side wall of the inner shell 32 and the inner side wall of the outer shell. The wiring cavity 322 can be distributed on all the outer side walls of the inner shell 32, and one outer side wall of the inner shell 32 can be provided with one, two or more wiring cavities 322. Figure 6 In the figure, the outer wall of the inner shell 32 is provided with a plurality of spaced partitions to form a chamber between two adjacent partitions, and each chamber cooperates with the first side wall 313 or the second side wall 314 of the outer shell to form a wiring chamber 322, and the terminal mounting groove 321 is formed by the area of ​​the wiring chamber 322 close to the wiring socket.

[0052] In this embodiment, the second end of the conductive bar 1 can be fixedly connected to the conductive plate inside the housing. For example, a contact mechanism is electrically connected between a pair of wiring terminals. The contact mechanism includes a movable contact and a static contact that cooperate with each other. The conductive plate connected between the contact mechanism and the conductive bar 1 is arranged along the wiring cavity 322.

[0053] Each circuit breaker pole is also provided with a mutual inductor, which is adjacent to the moving contact or the stationary contact in the contact mechanism. A terminal block is provided in the central hole of the mutual inductor, and the terminal block connects the adjacent moving contact or the stationary contact with the conductive plate. Thus, the conductive plate and the terminal block with higher heat generation are arranged outside the inner shell 32 to avoid high temperature affecting the product performance. Of course, one end of the conductive plate away from the conductive block 1 can also pass through the inner shell 32 to be connected to the contact mechanism. Furthermore, a plurality of heat dissipation holes 315 are provided on the side wall of the outer shell opposite to the conductive plate, so as to reduce the temperature of the terminal block and the conductive plate.

[0054] Other structures may also be arranged inside each circuit breaker pole, such as an arc extinguishing system, a short circuit protection mechanism, and an overload protection mechanism, that is, except for the wiring terminals, the rest of the circuit breaker pole may adopt the existing technology.

[0055] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0056] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A plug-in circuit breaker, comprising a housing, one end of which is an operating end, and the other end of which is provided with a wiring socket, wherein a wiring terminal is provided in the wiring socket, characterized in that: The wiring terminal comprises a conductive bar (1) and at least two terminal assemblies (2) arranged side by side and at intervals, two ends of each terminal assembly (2) respectively forming two elastic clamping ends, one end of the conductive bar (1) is provided with at least two clamping portions (11) arranged side by side and at intervals, and each clamping portion (11) is clamped by a clamping end of a terminal assembly (2).

2. The plug-in circuit breaker according to claim 1, characterized in that: The terminal assembly (2) comprises a bracket, on which a pair of spaced-apart spring sheets (23) are arranged, a clamping piece is arranged between the pair of spring sheets (23), two ends of the clamping piece are respectively formed into two elastic clamping ends, each clamping end has a clamping gap for inserting the clamping part (11), and a side of each clamping end facing away from the clamping gap is respectively connected to an adjacent spring sheet (23).

3. The plug-in circuit breaker according to claim 2, characterized in that: The clamping member comprises two clamping pieces arranged at intervals, wherein the middle parts of the two clamping pieces respectively cooperate with the bracket to form a first fulcrum, and the gap between the two clamping pieces corresponding to the first fulcrum is the smallest, so that the same end of the two clamping pieces and the gap between the same ends cooperate to form a clamping end, and one of the clamping ends cooperates with the clamping portion (11) to form a second fulcrum.

4. The plug-in circuit breaker according to claim 2 or 3, characterized in that: A mutually cooperating limiting structure is provided between the clamping portion (11) and the clamping end, the limiting structure comprising a mutually cooperating limiting groove (223) and a limiting protrusion (12), the limiting groove (223) being provided on the clamping end and / or the clamping portion (11), and the limiting protrusion (12) being provided on the clamping portion (11) and / or the clamping end. The contact surface between the limiting groove (223) and the limiting protrusion (12) is an arc-shaped surface, so that the limiting protrusion (12) rotates in the limiting groove (223) to form a second fulcrum between the clamping end and the clamping portion (11).

5. The plug-in circuit breaker according to claim 1, characterized in that: The conductive bar (1) comprises a plate-shaped body, the middle part of which is bent at least once so that the first end and the second end of the plate-shaped body are respectively located on two mutually parallel planes, and the width of the first end of the plate-shaped body is greater than that of the second end of the plate-shaped body, the first end of the plate-shaped body is divided into at least two clamping parts (11) arranged side by side and at intervals, at least one side of each clamping part (11) protrudes from the middle of the plate surface to form an arc-shaped limiting protrusion (12), and the second end of the plate-shaped body is provided with at least one fixing hole (13).

6. The plug-in circuit breaker according to claim 1, characterized in that: An inner shell (32) is arranged inside the outer shell, a contact mechanism electrically connected to a wiring terminal is arranged inside the inner shell (32), a terminal installation groove (321) is arranged on an outer side wall at one end of the inner shell (32), and each terminal installation groove (321) is used to arrange a wiring terminal corresponding to a wiring socket.

7. The plug-in circuit breaker according to claim 6, characterized in that: A wiring cavity (322) is provided between the outer side wall of the inner shell (32) and the inner side wall of the outer shell, and a terminal installation groove (321) is formed in an area of ​​the wiring cavity (322) close to the wiring socket.

8. The plug-in circuit breaker according to claim 7, characterized in that: A contact mechanism is arranged inside the inner shell (32); one end of the conductive row (1) away from the terminal assembly (2) is connected to a conductive plate; the conductive plate is arranged along the wiring cavity (322) and passes through the inner shell (32) to be electrically connected to the contact mechanism.

9. The plug-in circuit breaker according to any one of claims 6 to 8, characterized in that: A mutual inductor is also arranged inside the inner shell (32), the mutual inductor is adjacent to the moving contact or the stationary contact of the contact mechanism, a wiring row is arranged in the central hole of the mutual inductor, and the wiring row is connected between the conductive plate and the adjacent moving contact or the stationary contact.

10. The plug-in circuit breaker according to claim 9, characterized in that: A plurality of heat dissipation holes (315) are provided on the side wall of the housing opposite to the conductive plate.

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