A plug-in circuit breaker

Abstract

The application discloses a plug-in circuit breaker, which comprises at least two circuit breaker poles arranged in parallel and spliced, two ends of each circuit breaker pole are respectively used as a first wiring end and a second wiring end, a contact mechanism is arranged between the first wiring end and the second wiring end, the contact mechanism comprises a movable contact and a static contact matched with each other, movable contacts of the at least two circuit breaker poles are connected in linkage, one of the circuit breaker poles is used as a main movable pole, and the rest of the circuit breaker poles are used as driven poles, an operating member is arranged at the first wiring end of the main movable pole, an operating mechanism is connected in linkage between the operating member and the contact mechanism of the main movable pole, and the movable contact of the main movable pole is driven by the operating mechanism, and the movable contact of the driven pole is driven by the movable contact of the main movable pole when the circuit breaker is switched on and off.

Description

Technical Field

[0001] This invention relates to low-voltage electrical appliances, and more specifically to a plug-in circuit breaker. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions and close, carry, and interrupt current under abnormal circuit conditions within a specified time. According to its installation method, it is usually divided into plug-in type, fixed type, and drawer type circuit breakers.

[0003] Existing plug-in circuit breakers have the following drawbacks: First, multi-pole circuit breakers are usually composed of multiple single-pole circuit breakers, each with its own operating mechanism. This results in complex and costly manufacturing processes for multiple independent operating mechanisms, and requires significant operating force, reducing the circuit breaker's reliability. Second, the circuit breaker itself does not have a surge protection module; instead, the surge protection module is installed in a cabinet, making assembly and disassembly difficult and hindering the replacement of the surge protection module. Third, circuit breakers are mostly manually operated and lack remote operation capabilities, failing to meet the requirements for intelligent circuit breakers. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plug-in circuit breaker with a simple structure, a lightning protection module, and the ability to automatically open and close.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A plug-in circuit breaker includes at least two circuit breaker poles arranged in parallel. The two ends of each circuit breaker pole serve as a first terminal and a second terminal, respectively. A contact mechanism is provided between the first terminal and the second terminal. The contact mechanism includes a moving contact and a stationary contact that cooperate with each other. The moving contacts of the at least two circuit breaker poles are linked together. One circuit breaker pole serves as the active pole, and the other circuit breaker poles serve as the driven poles. An operating element is provided at the first terminal of the active pole. An operating mechanism is linked between the operating element and the contact mechanism of the active pole. When the circuit breaker is opening or closing, the moving contact of the active pole is driven by the operating mechanism, and the moving contact of the driven pole is driven by the moving contact of the active pole.

[0007] Furthermore, the main control circuit board of the circuit breaker and the electric operating module driven by the main control circuit board are installed in the active pole. The electric operating module is linked with the operating mechanism to enable the circuit breaker to automatically open and close.

[0008] Furthermore, a lightning protection module is also installed inside the circuit breaker pole, and the lightning protection module is connected to the main line of each circuit breaker pole.

[0009] Furthermore, an arc-extinguishing device is provided inside the circuit breaker poles. The arc-extinguishing device includes an arc-extinguishing chamber disposed between the contact mechanism and the second terminal, and a lightning protection module is provided between the arc-extinguishing chamber and the second terminal.

[0010] Furthermore, a second circuit board is provided on one side of the lightning protection module, which runs through the adjacent circuit breaker poles. The lightning protection modules of each circuit breaker pole are electrically connected to the main control circuit board of the circuit breaker through the second circuit board.

[0011] Furthermore, a current transformer is provided inside the circuit breaker pole, and a first circuit board is provided on one side of the current transformer, which penetrates the adjacent circuit breaker pole. The current transformers of each circuit breaker pole are connected to the first circuit board.

[0012] Furthermore, an overcurrent protection mechanism is provided within the active electrode. The overcurrent protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism respectively disposed on both sides of the operating mechanism. One end of the short-circuit protection mechanism is opposite to the operating mechanism, and the movable end of the overload protection mechanism is opposite to the operating mechanism. The current transformer is disposed between the short-circuit protection mechanism and the contact mechanism.

[0013] Furthermore, one of the driven poles is the N-phase circuit breaker pole, and a contact mechanism, an arc extinguishing device, and a lightning protection module are sequentially arranged between the first and second terminals of the N-phase circuit breaker pole, but no current transformer and overcurrent protection mechanism are provided.

[0014] Furthermore, the driven pole includes at least one L-phase circuit breaker pole and one N-phase circuit breaker pole. The moving contacts of both the L-phase circuit breaker pole and the N-phase circuit breaker pole are linked to the moving contacts of the driving pole via a linkage shaft.

[0015] Furthermore, the contact mechanism includes a contact support, a moving contact, a stationary contact, and a contact spring. The moving contact is disposed on the contact support, and a contact spring is provided between the contact support and the moving contact. The contact support is rotatably installed inside the circuit breaker pole. The operating mechanism is connected to the contact support of the active pole, and the moving contacts of two adjacent circuit breaker poles are linked together through the contact support.

[0016] Furthermore, an arc-extinguishing device is provided in each circuit breaker pole, and the contact mechanism also includes an insulating baffle. The stationary contact is fixed in the circuit breaker pole and is opposite to the moving contact. The insulating baffle is set between the contact mechanism and the arc-extinguishing chamber of the arc-extinguishing device, and is located above the stationary contact. The moving contact of the contact mechanism passes through the insulating baffle and extends into the arc-extinguishing chamber.

[0017] Furthermore, the operating mechanism includes a first link, a linkage component, a second link, a support component, an active latch, and a jump latch. The support component is rotatably assembled inside the active pole, and the jump latch and the active latch are rotatably assembled on the support component. One end of the jump latch and the active latch are fastened together. The linkage component is rotatably assembled between the support component and the operating component. The linkage component is linked with the jump latch through the first link, and the support component is connected to the moving contact through the second link.

[0018] Furthermore, a driven latch and an overcurrent protection mechanism are provided inside the L-phase circuit breaker pole. The driven latch is rotatably assembled and linked with the active latch of the operating mechanism. When an overcurrent fault occurs in the driven pole, the overcurrent protection mechanism drives the driven latch to drive the active latch, triggering the operating mechanism to trip.

[0019] Furthermore, the device includes a housing, an inner cavity divided to form at least two circuit breaker poles, a second mounting groove spanning at least two mounting cavities is provided on one side of the housing, a second circuit board is mounted in the second mounting groove, and a second cover plate covers the second mounting groove.

[0020] Furthermore, the device includes a housing, an inner cavity divided to form at least two circuit breaker poles, a first mounting groove spanning at least two mounting cavities is provided on one side of the housing, a first circuit board is mounted in the first mounting groove, and a first cover plate covers the first mounting groove.

[0021] Furthermore, the operating component is a button mechanism that slides linearly at one end of the active pole.

[0022] The present invention discloses a plug-in circuit breaker, wherein the operating mechanism is provided only in the active pole, and the contact mechanism of the active pole is directly driven by the operating mechanism. The contact mechanisms of the other circuit breaker poles perform opening and closing actions in conjunction with the contact mechanism of the active pole. This simplifies the manufacturing process, reduces costs, and also requires less operating force, thereby improving the stability of the circuit breaker.

[0023] In addition, the installation of a surge protection module inside the circuit breaker, especially since the surge protection module can be installed through the second mounting slot on one side of the casing, simplifies the assembly process and facilitates the disassembly and installation of the surge protection module.

[0024] In addition, an electric control module for automatically opening and closing the circuit breaker is installed in the active pole, enabling the circuit breaker to have remote operation function and meeting the requirements of intelligent circuit breaker.

[0025] In addition, an overcurrent protection mechanism and a current transformer are installed inside the circuit breaker poles to improve the sensitivity and reliability of the circuit breaker. A first mounting slot is provided on one side of the casing to facilitate the assembly of the first circuit board connected to the current transformer. Attached Figure Description

[0026] Figure 1This is an external schematic diagram of a plug-in circuit breaker according to the present invention;

[0027] Figure 2 This is an exploded view of a plug-in circuit breaker according to the present invention;

[0028] Figure 3 This is a schematic diagram of the housing structure of a plug-in circuit breaker according to the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the circuit breaker pole of a plug-in circuit breaker according to the present invention;

[0030] Figure 5 This is a schematic diagram of the active pole in a plug-in circuit breaker according to the present invention;

[0031] Figure 6 This is a schematic diagram of the active pole in a plug-in circuit breaker according to the present invention (excluding the electrical control module);

[0032] Figure 7 This is a schematic diagram of the structure of the N-phase circuit breaker pole in a plug-in circuit breaker of the present invention (excluding the lightning protection module).

[0033] Figure 8 This is a schematic diagram of the operating mechanism and moving contact in a plug-in circuit breaker according to the present invention;

[0034] Figure 9 This is a schematic diagram of the operating mechanism and moving contact in a plug-in circuit breaker according to the present invention;

[0035] Figure 10 This is a schematic diagram of the contact mechanism in a plug-in circuit breaker according to the present invention;

[0036] Figure 11 This is a schematic diagram of the structure of the moving contact in a plug-in circuit breaker according to the present invention. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 1 to 11 The given embodiments further illustrate specific implementations of a plug-in circuit breaker according to the present invention. The plug-in circuit breaker of the present invention is not limited to the description of the following embodiments.

[0038] A plug-in circuit breaker includes a housing 1, within which mounting cavities are partitioned to form at least two circuit breaker poles. At least one partition 15 (see [reference]) is disposed within the housing 1. Figure 2The housing 1 includes a first side plate, a second side plate, and at least one partition 15 disposed between the first side plate and the second side plate. The first side plate, at least one partition 15, and the second side plate are sequentially spliced ​​to divide the housing 1 into mounting cavities for at least two circuit breaker poles. One circuit breaker pole is assembled in each mounting cavity, thus at least two circuit breaker poles are arranged side by side within the housing 1. Of course, each circuit breaker pole includes an independent phase pole housing, and two adjacent circuit breaker poles are assembled together through their respective phase pole housings. The housing 1 is composed of multiple phase pole housings, and the internal space of each phase pole housing can also serve as a mounting cavity. This splicing and assembly structure allows for the assembly of various circuit breakers, such as two-pole, three-pole, or four-pole circuit breakers, according to the user's needs.

[0039] A first wiring port and a second wiring port are respectively provided at both ends of the mounting cavity, such as... Figure 4-7 As shown, one end of the circuit breaker pole is provided with a first terminal 671 as the first wiring terminal, which corresponds to the first wiring port. The other end of the circuit breaker is provided with a second terminal 672 as the second wiring terminal, which corresponds to the second wiring port. The second wiring port is a plug-in structure, and the corresponding second terminal 672 assembled in the second wiring port is a pluggable terminal, so that the circuit breaker can be connected by plugging and unplugging. A contact mechanism is provided between the first terminal 671 and the second terminal 672 of each circuit breaker pole. The contact mechanism is electrically connected to the first terminal 671 and the second terminal 672 to control the opening and closing of the main line of each circuit breaker pole. The moving contacts 611 of two adjacent circuit breaker poles are linked together by a linkage shaft, or one end of the moving contacts 611 of all circuit breaker poles is an integral structure. An arc extinguishing device is provided between the contact mechanism of each circuit breaker pole and the second wiring terminal.

[0040] One improvement of this application is that the plug-in circuit breaker includes at least two circuit breaker poles arranged in parallel. Among the two or more circuit breaker poles, one circuit breaker pole serves as the active pole 2, and the remaining circuit breaker poles serve as the driven poles 3. Only the active pole 2 is provided with an operating element 21 and an operating mechanism 22. The operating element 21 is located at the first terminal of the active pole 2. In this embodiment, the operating element 21 is a button mechanism that slides linearly at one end of the active pole 2. Specifically, an operating mechanism for assembling the operating element 21 is provided on one side of the first terminal of the mounting cavity. The operating mechanism 22 is located between the operating element 21 and the contact mechanism. The operating element 21, the operating mechanism 22, and the moving contact 611 of the contact mechanism of the active pole 2 are sequentially linked. When the circuit breaker is opening or closing, the moving contact 611 of the active pole 2 is directly driven by the operating mechanism 22, and the moving contact 611 of the driven pole 3 is driven by the moving contact 611 of the active pole 2. In this way, only one operating mechanism 22 is required in the multi-pole circuit breaker. By omitting the operating mechanism 22, the manufacturing process is simplified, thereby reducing costs and improving the operational stability of the circuit breaker. Of course, as another embodiment of the operating element 21, the operating element 21 can also be a rotating handle mechanism.

[0041] Furthermore, the active pole 2 is also equipped with a main control circuit board 51 for the circuit breaker and an electric operating module 23 driven by the main control circuit board 51 (see...). Figure 2 , 5 The electric control module 23 is linked to the operating mechanism 22. A microcontroller is provided on the main control circuit board 51. The microcontroller can receive and output control signals, causing the electric control module 23 to drive the operating mechanism 22 to operate, thereby realizing the automatic opening and closing of the circuit breaker and enabling the circuit breaker to have remote control function. Of course, if the main control circuit board 51 has too many functions, some functions can be split into a sub-control circuit board (not shown), and the sub-control circuit board can be set in the driven pole 3. The main control circuit board 51 and the sub-control circuit board can be connected together through circuit boards or wires. Of course, the main control circuit board can also be set in the driven pole 3, for example, in the pole 4 of the N-phase circuit breaker.

[0042] Furthermore, when the number of circuit breaker poles is three or more, it is preferable to place the active pole 2 in the middle position of all circuit breaker poles to shorten the linkage time of each pole and reduce the operating force, thereby further improving the operational stability of the circuit breaker. The driven pole 3 includes at least one L-phase circuit breaker pole. When the driven pole 3 includes an N-phase circuit breaker pole 4, it is preferable to place the N-phase circuit breaker pole 4 in the outermost position. The moving contacts 611 of the L-phase circuit breaker pole and the moving contacts 611 of the N-phase circuit breaker pole 4 are both linked to the moving contacts 611 of the active pole 2 through a linkage shaft. Except for the absence of the operating mechanism 22, the setting and layout of the other mechanisms of the L-phase circuit breaker pole are basically the same as those of the active pole 2. The actual active pole 2 is also an L-phase circuit breaker.

[0043] As an improvement of this application, a surge protection module 66 is provided inside each circuit breaker pole (see...). Figure 3 , 5 (6) The surge protection module 66 is connected in the main line of each circuit breaker pole. Preferably, a chamber for assembling the surge protection module 66 is reserved in the mounting cavity, and the opening of the chamber faces outward, so that the surge protection module 66 can be assembled into the mounting cavity from one side of the housing 1. Further, the chamber for assembling the surge protection module 66 in each circuit breaker pole is set between the arc extinguishing device and the second terminal, and the openings of all chambers face the same side of the housing 1, thereby forming a second mounting groove 13 spanning each mounting cavity on one side of the housing 1. After the surge protection module 66 is assembled, the second mounting groove 13 is covered by the second cover plate 14, and the surge protection module 66 is assembled in the circuit breaker. In particular, the surge protection module 66 can be assembled and disassembled from one side of the housing 1, which is convenient for replacing the surge protection module 66. Preferably, the openings of all chambers are set in the same direction. Figure 1 See the upper or lower side of the outer casing 1. Figure 3 In this embodiment, the opening of the chamber is located on the lower side, and the openings of each circuit breaker pole are arranged side by side. The installation direction of the surge protection module 66 is perpendicular to the direction in which the plug-in circuit breaker is inserted into the cabinet. Clearly, the arrangement of the surge protection module in this application is not only applicable to embodiments where the operating mechanism 22 is only provided on the active pole 2, but also to embodiments where each circuit breaker pole has an operating mechanism 22, and to other circuit breaker pole embodiments with different structures.

[0044] Preferably, a current transformer 62 is also provided in each circuit breaker pole (see Figure 5 , 6 The current transformer 62 is connected to the main line between the contact mechanism and the first terminal 671 for collecting current signals. A first circuit board 52 is provided on one side of the current transformer 62, penetrating adjacent circuit breaker poles. The first circuit board 52 is electrically connected to the main control circuit board 51. Multiple current transformers 62 within the circuit breaker poles are respectively connected to the first circuit board 52 and feed back current signals to the main control circuit board 51 of the circuit breaker through the first circuit board 52. Further, such as... Figure 3As shown, the first circuit board 52 can be mounted into the mounting cavity from one side of the housing 1. Specifically, a first mounting groove 11 spanning each mounting cavity is provided on one side of the housing 1. The first mounting groove 11 connects the areas of each mounting cavity near the first terminal. The first circuit board 52 is mounted in the first mounting groove 11 and covered by a first cover plate 12 spanning at least two mounting cavities. It should be noted that the first circuit board 52 can be used not only to connect the current transformer 62, but also to provide other electrical signals to the main control circuit board 51. Obviously, the arrangement of the current transformer 62 in this application is not only applicable to embodiments where the operating mechanism 22 is only provided on the active pole 2, but also applicable to embodiments where the operating mechanism 22 is provided on each circuit breaker pole, and also applicable to circuit breaker pole embodiments with other structures.

[0045] Preferably, a locking element is also provided in all circuit breaker poles, and the locking elements of two adjacent circuit breaker poles are linked together. The locking element is located between the first terminal 671 and the moving contact 611 in the contact mechanism. In this case, the current transformer 62 of each pole is preferably located between the moving contact 611 and the locking element to avoid occupying too much space and to make the internal layout more compact. Compared with the existing structure that places the current transformer 62 between the second terminal and the arc extinguishing device, the layout of this application is conducive to reducing the length of the circuit breaker. Of course, the length of the existing circuit breaker can also be maintained. The layout of this application can leave space for assembling other functional modules between the arc extinguishing device and the second terminal. In this application, a lightning protection module 66 is set at this position, which is conducive to the miniaturization design of the circuit breaker.

[0046] Furthermore, an overcurrent protection mechanism is also provided inside the circuit breaker pole. The overcurrent protection mechanism is located on one or both sides of the locking element. The overcurrent protection mechanism is located in the same position in the active pole 2 and the driven pole 3, but the operating principle is slightly different. An operating mechanism 22 is provided in the active pole 2. The operating mechanism 22 includes an active latch 222 as a locking element. When a short circuit and / or overload fault occurs in the main line of the active pole 2, the overcurrent protection mechanism triggers the active latch 222 to disengage the operating mechanism 22. A driven latch 31 is provided in the driven pole 3 and is linked to the active latch 222. When a short circuit and / or overload fault occurs in the main line of the driven pole 3, the overcurrent protection mechanism triggers the driven latch 31. The driven latch 31 drives the active latch 222 to disengage the operating mechanism 22.

[0047] The overcurrent protection mechanism includes a short-circuit protection mechanism 64 and an overload protection mechanism 65. In the active pole 2, the short-circuit protection mechanism 64 and the overload protection mechanism 65 are located on both sides of the active latch 222. Preferably, the short-circuit protection mechanism 64 is inclined to avoid the need for more operating space for the horizontally arranged short-circuit protection mechanism 64. The overload protection mechanism 65 is arranged side by side with the moving contact 611 along the side of the circuit breaker pole. The width of the moving contact 611 is significantly smaller than the width of the arc-extinguishing chamber 631. The arrangement of the overload protection mechanism 65 in parallel with the moving contact 611 allows the width of the circuit breaker pole to be approximately the same as that of the arc-extinguishing chamber 631, which helps to reduce the overall width of the circuit breaker.

[0048] like Figure 5-6 One end of the short-circuit protection mechanism 64 and the movable end of the overload protection mechanism 65 are both opposite to the active latch 222. When a short circuit or overload fault exists in the main line of the active pole 2, the operating mechanism 22 is triggered to trip. (See also...) Figure 4 In the driven pole 3, the driven latch 31 is rotatably mounted in the middle of the driven pole 3. The driven latch 31 is linked with the active latch 222. The short-circuit protection mechanism 64 and the overload protection mechanism 65 are located on both sides of the driven latch 31. One end of the short-circuit protection mechanism 64 and the movable end of the overload protection mechanism 65 are opposite to the driven latch 31. When a short circuit or overload fault exists in the main circuit of the driven pole 3, the driven latch 31 is triggered. The driven latch 31 drives the active latch 222, thereby disengaging the operating mechanism 22. Preferably, the driven latch 31 can be connected to the active latch 222 via a shaft (not shown).

[0049] Combination Figure 1-11 An embodiment of a plug-in circuit breaker is provided. In this embodiment, the circuit breaker is a four-pole circuit breaker. The housing 1 is divided into four mounting chambers by three partitions 15. The four circuit breaker poles are arranged sequentially from left to right as A-phase circuit breaker pole, B-phase circuit breaker pole, C-phase circuit breaker pole, and N-phase circuit breaker pole 4. The B-phase circuit breaker pole serves as the active pole 2, and the other three circuit breaker poles serve as the driven poles 3. The A-phase, B-phase, and C-phase circuit breaker poles serve as the L-phase circuit breaker poles. For ease of explanation, in this embodiment, ... Figure 5-7 In the direction of the circuit breaker, the direction between the first and second terminals of the circuit breaker pole is the length direction of the circuit breaker, the direction from the top to the bottom of the circuit breaker pole is the height direction of the circuit breaker, and the direction perpendicular to the plane of the paper is the thickness direction of the circuit breaker.

[0050] like Figure 2 , 5As shown in Figure 6, the active electrode 2 is assembled in a mounting cavity in the middle of the housing 1. A first terminal 671 and an operating member 21 are provided at the first terminal of the active electrode 2, respectively located on opposite sides of the first terminal. A pluggable second terminal 672 is provided at the second terminal of the active electrode 2, wherein the second terminal 672 and the operating member 21 are arranged along the same side of the mounting cavity. In this embodiment, the first terminal is the inlet terminal, the first terminal 671 is the inlet terminal, the second terminal is the outlet terminal, and the second terminal 672 is the outlet terminal. Alternatively, the first terminal can also be the outlet terminal, and the second terminal can be the inlet terminal; correspondingly, the first terminal 671 is the outlet terminal, and the second terminal 672 is the inlet terminal.

[0051] An operating mechanism 22, a contact mechanism, and an arc-extinguishing device are provided between the operating component 21 and the second terminal 672. The contact mechanism is located in the middle of the active electrode 2. The operating mechanism 22 is linked to the operating component 21. The moving contact 611 of the contact mechanism is connected to the operating mechanism 22. The stationary contact 612 of the contact mechanism is fixed on one side of the active electrode 2 and is opposite to the moving contact 611. The stationary contact 612 and the operating component 21 are located on both sides of the mounting cavity. The arc-extinguishing device includes an arc-extinguishing chamber 631, an arc-inducing plate 632, and an arc-inducing piece 633. The arc-extinguishing chamber 631 is disposed between the contact mechanism and the second terminal 672. The arc-inducing plate 632 is disposed on one side of the arc-extinguishing chamber 631 and is connected to the stationary contact 612. The arc-inducing piece 633 is disposed on the other side of the arc-extinguishing chamber 631 and is electrically connected to the moving contact 611.

[0052] like Figure 5 , 6 As shown, the operating component 21 includes a button and a third link 211 connected to one end of the button. The operating mechanism 22 includes a first link 224, a linkage 221, a second link 225, a support 223, an active latch 222, and a jump catch 226. The support 223 is rotatably mounted inside the active pole 2. The jump catch 226 and the active latch 222 are rotatably mounted on the support 223. The jump catch 226 and the active latch 222 are fastened together at one end. The device is provided with a first cantilever 2221 and a second cantilever 2222, which protrude to both sides respectively. The linkage 221 is rotatably assembled between the support 223 and the operating member 21. The linkage 221 is linked with the jump buckle 226 through the first link 224. The support 223 is linked with the moving contact 611 through the second link 225. The operating member 21 is linked with the linkage 221 through the third link 211, which is used to drive the operating mechanism 22 to move.

[0053] like Figure 6 , 8As shown in Figure -11, the contact mechanism includes a contact support 613, a moving contact 611, a stationary contact 612, and a contact spring 614. The contact support 613 is rotatably mounted in the mounting cavity. The moving contact 611 is disposed on the contact support 613. The contact spring 614 is provided between the contact support 613 and the moving contact 611. The contact support 613 is rotatably mounted in the circuit breaker pole. The operating mechanism is linked to the contact support 613 of the active pole 2 through the second connecting rod 225. The operating mechanism drives the moving contact 611 of the active pole 2 through the contact support 613 of the active pole 2. The stationary contact 612 is fixed on one side of the circuit breaker pole and is opposite to the moving contact 611. The moving contacts 611 of two adjacent circuit breaker poles are linked together through the contact support 613. Preferably, the contact mechanism further includes an insulating baffle 615, which is disposed between the contact mechanism and the arc-extinguishing chamber 631 of the arc-extinguishing device, and above the stationary contact 612. The moving contact 611 of the contact mechanism passes through the insulating baffle 615 and extends into the arc-extinguishing chamber 631 to cooperate with the stationary contact 612, preventing the electric arc in the arc-extinguishing chamber 631 from being sprayed back towards the contact mechanism. An arc-shaped concave surface corresponding to the rotation trajectory of the contact support 613 is formed on the side of the insulating baffle 615 facing the contact support 613. Correspondingly, an arc-shaped retaining edge 616 with the same movement trajectory as the moving contact 611 is provided on the surface of the insulating baffle 615 facing the arc-extinguishing chamber 631.

[0054] like Figure 2 and 5As shown, the electric control module 23 and the main control circuit board 51 of the circuit breaker are stacked in the active pole 2, specifically located between the first terminal of the active pole 2 and the active latch 222. The electric control module 23 includes a motor 231 and a gear set 232 that are meshed together. The motor 231 is connected to the main control circuit board 51, and the gear set 232 is linked to the operating mechanism 22. A microcontroller for driving the motor 231 to rotate is provided on the main control circuit board 51. When the motor 231 receives an action signal, it rotates or stops, thereby driving the gear set 232 to drive the operating mechanism 22 to perform opening and closing actions. The number of gear sets 232 can be increased or decreased according to the actual situation. In this embodiment, the main control circuit board 51 is disposed on one side of the partition 15, that is, the main control circuit board 51 is disposed on one side of the mounting cavity of the active pole 2 in the thickness direction and extends in the length direction between the first mounting groove 11 and the second mounting groove 13. The electric operating module 23 is located between the main control circuit board 51 and the active pole 2. The motor 231 is disposed vertically, that is, perpendicular to the partition 15 and the main control circuit board 51. Preferably, the motor 231 is located between the first terminal 671 and the operating mechanism 22. The gear set 232 is stacked on one side of the operating member 21 and cooperates with the operating mechanism 22. The first stage gear of the gear set 232 meshes with the motor 231, and the last stage gear of the gear set 232 is linked to the linkage member 221 of the operating mechanism 22. By driving the linkage member 221, the operating mechanism 22 is actuated, thereby realizing the automatic opening and closing of the circuit breaker.

[0055] like Figure 3 , 5 As shown in Figure 6, a current transformer 62 is provided on one side of the operating mechanism 22. The current transformer 62 is connected to the wire between the contact mechanism and the first terminal to collect current signals. A first circuit board 52 is provided on one side of the current transformer 62. A first mounting groove 11 for assembling the first circuit board 52 is provided on one side of the housing 1. Preferably, the first mounting groove 11 spans all mounting cavities. The first circuit board 52 is disposed through one side of all mounting cavities and connected to the main control circuit board 51 for signal transmission. After assembly, it is covered by a first cover plate 12. In this embodiment, the first mounting groove 11 and the cavity opening (the opening direction of the second mounting groove 13) are located on the same side of the housing 1, opposite to the operating member 21, preferably located on the opposite side. Figure 1 The upper or lower side of the inner casing 1, that is, the side wall parallel to the thickness direction of the circuit breaker.

[0056] Overcurrent protection mechanisms are also provided on both sides of the operating mechanism 22. These overcurrent protection mechanisms include a short-circuit protection mechanism 64 and an overload protection mechanism 65. The short-circuit protection mechanism 64, the current transformer 62, and the stationary contact 612 are arranged on the same side of the mounting cavity. The current transformer 62 is inclined between the active latch 222 and the moving contact 611. The short-circuit protection mechanism 64 is located between the first terminal and the active latch 222. Figure 5 , 6 One end of the short-circuit protection mechanism 64 is inclined toward the overload protection mechanism 65 to avoid the horizontally installed short-circuit protection mechanism 64 requiring more operating space and increasing the width of the circuit breaker. The short-circuit protection mechanism 64 includes an electromagnetic coil and a moving iron core driven by the electromagnetic coil. One end of the moving iron core is opposite to the first cantilever 2221 of the active latch 222. When a short-circuit fault occurs in the active pole 2, the moving iron core triggers the first cantilever 2221 to disengage the latching engagement between the active latch 222 and the trip latch 226, thereby disengaging the operating mechanism 22. The overload protection mechanism 65 is located in the other part of the mounting cavity. On the same side of the mounting cavity, the overload protection mechanism 65, the operating element 21, and the arc-starting plate 633 are located. The overload protection mechanism 65 includes a bimetallic strip. The fixed end of the bimetallic strip and the moving contact 611 are arranged side by side in the mounting cavity. The movable end of the bimetallic strip extends along the side of the mounting cavity towards the first terminal, so that the movable end of the bimetallic strip is opposite to the second cantilever 2222 of the active latch 222. When an overload fault occurs in the active electrode 2, the bimetallic strip is heated and bent to trigger the second cantilever 2222, causing the active latch 222 to engage with the trip latch 226, thereby disengaging the operating mechanism 22. Of course, the positions of the short-circuit protection mechanism 64 and the overload protection mechanism 65 can be interchanged. That is, the overload protection mechanism 65 and the current transformer 62 are located on the same side of the mounting cavity, and the short-circuit protection mechanism 64 is located on the other side of the mounting cavity. In addition, the overcurrent protection mechanism can also only include the short-circuit protection mechanism 64 or the overload protection mechanism 65, or other current protection mechanisms, such as leakage protection mechanisms.

[0057] A cavity for assembling the surge protection module 66 is reserved in the active pole 2. The cavity is located between the arc-extinguishing chamber 631 and the second terminal 672. A cavity opening is provided on one side of the mounting cavity. Preferably, the cavity of the active pole 2 is in communication with the cavity of the adjacent driven pole 3. A second circuit board 53 is provided on one side of the surge protection module 66. The second circuit board 53 is installed inside the housing 1 along the inner side of the cavity opening. That is, both ends of the second circuit board 53 extend into the cavity of the adjacent circuit breaker pole (driven pole 3). The second circuit board 53 is installed through the cavity. Circuit board 53 is electrically connected to main control circuit board 51 for signal transmission. The stationary contact 612 of active electrode 2 is electrically connected to surge protection module 66 through arc ignition plate 632. The L-phase pin 661 and N-phase pin 662 of surge protection module 66 are respectively connected to second circuit board 53, so that surge protection module 66 is connected to the main line of active electrode 2 through second circuit board 53. The surge protection module 66 is also provided with auxiliary signal terminal 663. The auxiliary signal terminal 663 is connected to main control circuit board 51 through second circuit board 53 to realize signal transmission. In this embodiment, the chambers of all circuit breaker poles are connected only near the chamber openings, and the middle of adjacent chambers are still separated by partitions 15. This allows the surge protection modules 66 in all circuit breaker poles to be spaced apart. The second circuit board 53 is arranged on the same side of all surge protection modules 66 along the inner side of the second cover plate 14. Thus, all surge protection modules 66 can be connected to the second circuit board 53 at intervals first, and then the second circuit board 53 connected with the surge protection modules 66 is assembled together in the second mounting slot 13. At this time, the surge protection modules 66 are respectively placed into the chambers of the active pole 2 and the driven pole 3. After the assembly is completed, the second cover plate 14 is closed to keep the outer shell 1 flat, simplifying the disassembly and assembly process.

[0058] like Figure 1-2As shown in Figures 4 and 7, the driven pole 3 is assembled in another mounting cavity. The driven pole 3 includes a first terminal 671, a second terminal 672, a contact mechanism, an arc-extinguishing device, a lightning protection module 66, and a current transformer 62, which are arranged in the same manner as the active pole 2. The first terminal 671 and the second terminal 672 correspond to the first and second terminals of the mounting cavity, respectively. The contact mechanism is assembled in the middle of the driven pole 3. The contact mechanism includes a contact support 613, a moving contact 611, a stationary contact 612, a contact spring 614, and an insulating baffle 615. The moving contact 611 is mounted on the contact support 613, and the contact support 613 is rotatably mounted. The driven pole 3 is connected in conjunction with the active pole 2 and the contact support 613 in the adjacent driven pole 3. The stationary contact 612 is located on one side of the mounting cavity. The current transformer 62 is located between the contact mechanism and the first terminal 671. No operating element 21 or operating mechanism is provided in the driven pole 3, but the position of the current transformer 62 is the same as that of the current transformer 62 in the active pole 2, so that the current transformer 62 can be connected to the through-connected first circuit board 52. Of course, in other schemes where it is not necessary to connect all current transformers 62 through a first circuit board 52, the current transformer 62 may not be located in the same position as the current transformer 62 in the active pole 2. The arc extinguishing device is located between the contact mechanism and the second terminal 672. A cavity for assembling the surge protection module 66 is reserved between the arc extinguishing device and the second terminal 672. The surge protection module 66 is connected to the through-connected second circuit board 53.

[0059] An overcurrent protection mechanism can also be provided in the driven pole 3, and a driven latch 31 that cooperates with the overcurrent protection mechanism is assembled in the driven pole 3 (see Figure 4 The driven latch 31 is linked to the active latch 222 and located in the same position in different mounting cavities. Preferably, the layout of the overcurrent protection mechanism and the driven latch 31 is the same as that of the overcurrent protection mechanism and the active latch 222 of the active pole 2. The driven latch 31 is linked to the active latch 222. When an overcurrent fault occurs in the driven pole 3, such as a short circuit or overload fault, the overcurrent protection mechanism triggers the driven latch 31, which drives the active latch 222 to operate, causing the operating mechanism 22 of the active pole 2 to trip, thereby realizing the tripping of the circuit breaker and power disconnection. By omitting the operating mechanism in the driven pole 3 and only setting one driven latch 31, the structure is simplified and the cost is reduced.

[0060] Similar to the active pole 2, the current transformer 62 in the driven pole 3 is located between the driven latch 31 and the moving contact 611, that is, in the same position as the current transformer 62 in the active pole 2; the overcurrent protection mechanism includes a short-circuit protection mechanism 64 and / or an overload protection mechanism 65. The driven latch 31 also includes a first cantilever and a second cantilever. The short-circuit protection mechanism 64 is located on one side of the driven latch 31, and the moving iron core of the short-circuit protection mechanism 64 is opposite to the first cantilever. The overload protection mechanism 65 is located on the other side of the driven latch 31, and the movable end of the bimetallic strip of the overload protection mechanism 65 is opposite to the second cantilever. The driven latch 31 and the active latch 222 can adopt the same structure. Of course, since the driven pole 3 does not have a jumper 226, the other end of the driven latch 31 can omit the structure forming a snap connection.

[0061] Of course, as a simplified driven pole 3 structure, the driven pole 3 can also only be equipped with the same contact mechanism, arc-extinguishing chamber 631 and lightning protection module 66 as the active pole 2, without the overcurrent protection device, driven latch 31 and current transformer 62. When all driven poles 3 adopt a simplified structure and are assembled with the active pole 2, the first mounting slot 11 can be set only on one side of the active pole 2, or the first mounting slot 11 can be omitted directly, and the first circuit board 52 can also be set inside the active pole 2. At this time, the circuit breaker can still realize the function of connecting and disconnecting the circuit, but the effect in terms of current detection accuracy and overcurrent protection is relatively poor.

[0062] The simplified driven pole 3 is preferred as the pole 4 of the N-phase circuit breaker, such as... Figure 7As shown, the N-phase circuit breaker pole 4 is a driven pole 3 located on the side. The current transformer 62, overcurrent protection mechanism, and driven latch 31 are no longer installed in the N-phase circuit breaker pole 4. The first terminal 671, contact mechanism, arc-extinguishing chamber 631, and lightning protection module 66 adopt the same assembly method as other driven poles 3. Unlike other driven poles 3, preferably, the moving contact 611 in the contact mechanism is formed by two or more moving contacts 611 stacked together; that is, the thickness of the moving contact 611 of the N-phase circuit breaker pole 4 is greater than the thickness of the moving contact 611 of the L-phase circuit breaker pole. At least two parallel second terminals 6 are provided at the first terminal of the N-phase circuit breaker pole 4. 72. To increase the current carrying capacity, preferably, two second terminals 672 are provided on one side of the N-phase circuit breaker pole 4. At this time, two parallel second terminals are provided on one side of the second terminal in the mounting cavity, and a third terminal is provided on the other side of the second terminal. The third terminal adopts a plug-in structure, and a pluggable terminal is provided in the third terminal as a PE port 41. The lightning protection module 66 in the N-phase circuit breaker pole 4 is connected to the two parallel second terminals 672 and the PE port 41. The PE port 41 and the second terminals 672 are located on both sides (upper and lower sides) of the second terminal, respectively.

[0063] Preferably, the N-phase circuit breaker pole 4 is located in one of the outermost mounting cavities of the housing 1. Space is reserved inside the N-phase circuit breaker pole 4 for assembling a sub-control circuit board. By assembling the sub-control circuit board in the N-phase circuit breaker pole 4, the sub-control circuit board has functional modules separated from the main control circuit board 51. The sub-control circuit board and the main control circuit board 51 are preferably connected by a first circuit board 52. It should be noted that the terms "main control circuit board" and "sub-control circuit board" are merely distinguishing names and do not represent specific circuit boards. The circuit board located in the N-phase circuit breaker pole 4 can also be the main control circuit board, and the circuit board located in the active pole 2 can also be a sub-control circuit board.

[0064] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A plug-in circuit breaker, comprising a housing (1), at least three circuit breaker poles arranged in parallel, each circuit breaker pole having two ends serving as a first terminal and a second terminal respectively, and a contact mechanism provided between the first terminal and the second terminal, the contact mechanism comprising a moving contact (611) and a stationary contact (612) cooperating with each other, characterized in that: One circuit breaker pole serves as the active pole (2), and the remaining circuit breaker poles serve as the driven poles (3). The housing (1) is divided into mounting cavities for at least three circuit breaker poles. One circuit breaker pole is installed in each mounting cavity. Only the active pole (2) is provided with an operating element (21) and an operating mechanism (22). The operating element (21) is provided at the first terminal of the active pole (2), and the operating mechanism (22) is provided in the mounting cavity where the active pole (2) is installed. The operating mechanism (22) is linked to the operating element (21) and the active pole (3). Between the contact mechanisms of the moving pole (2), the driven pole (3) includes at least one L-phase circuit breaker pole and one N-phase circuit breaker pole (4). The moving contact (611) of the L-phase circuit breaker pole and the moving contact (611) of the N-phase circuit breaker pole (4) are both linked to the moving contact (611) of the active pole (2) through the linkage shaft. When the circuit breaker is opening and closing, the moving contact (611) of the active pole (2) is driven by the operating mechanism (22), and the moving contact (611) of the driven pole (3) is driven by the moving contact (611) of the active pole (2). The operating mechanism (22) includes a first link (224), a linkage (221), a second link (225), a support (223), an active latch (222), and a trip latch (226). The support (223) is rotatably mounted in the active pole (2). The trip latch (226) and the active latch (222) are rotatably mounted on the support (223). One end of the trip latch (226) and the active latch (222) are fastened together. The linkage (221) is rotatably mounted between the support (223) and the operating member (21). The linkage (221) is linked to the trip latch (226) through the first link (224). The support (223) is connected to the moving contact (611) through the second link (225). An overcurrent protection mechanism is also provided in the active pole (2). A driven latch (31) and an overcurrent protection mechanism are provided in the L-phase circuit breaker pole of the driven pole (3). The driven latch (31) is rotated and connected to the active latch (222) of the operating mechanism (22). When an overcurrent fault occurs in the driven pole (3), the overcurrent protection mechanism drives the driven latch (31) to drive the active latch (222) and triggers the operating mechanism (22) to trip.

2. The plug-in circuit breaker according to claim 1, characterized in that: The main control circuit board (51) of the circuit breaker and the electric operating module (23) driven by the main control circuit board (51) are installed in the active pole (2). The electric operating module (23) is linked with the operating mechanism (22) to enable the circuit breaker to automatically open and close.

3. A plug-in circuit breaker according to claim 1, characterized in that: A lightning protection module (66) is also provided inside the circuit breaker pole, and the lightning protection module (66) is connected to the main line of each circuit breaker pole.

4. A plug-in circuit breaker according to claim 3, characterized in that: An arc-extinguishing device is also provided inside the circuit breaker pole. The arc-extinguishing device includes an arc-extinguishing chamber (631) disposed between the contact mechanism and the second terminal, and a lightning protection module (66) is provided between the arc-extinguishing chamber (631) and the second terminal.

5. A plug-in circuit breaker according to claim 3, characterized in that: A second circuit board (53) is provided on one side of the lightning protection module (66) and passes through the adjacent circuit breaker poles. The lightning protection module (66) of each circuit breaker pole is electrically connected to the main control circuit board (51) of the circuit breaker through the second circuit board (53).

6. A plug-in circuit breaker according to claim 1, characterized in that: A current transformer (62) is also provided inside the circuit breaker pole. A first circuit board (52) is provided on one side of the current transformer (62) that penetrates the adjacent circuit breaker pole. The current transformer (62) of each circuit breaker pole is connected to the first circuit board (52).

7. A plug-in circuit breaker according to claim 6, characterized in that: The overcurrent protection mechanism includes a short-circuit protection mechanism (64) and an overload protection mechanism (65) respectively disposed on both sides of the operating mechanism (22). One end of the short-circuit protection mechanism (64) is opposite to the operating mechanism (22), and the movable end of the overload protection mechanism (65) is opposite to the operating mechanism (22). The current transformer (62) is disposed between the short-circuit protection mechanism (64) and the contact mechanism.

8. A plug-in circuit breaker according to any one of claims 1-7, characterized in that: A contact mechanism, an arc extinguishing device, and a lightning protection module (66) are sequentially arranged between the first and second terminals of the N-phase circuit breaker pole (4), but no current transformer (62) and overcurrent protection mechanism are provided.

9. A plug-in circuit breaker according to claim 1, characterized in that: The contact mechanism includes a contact support (613), a moving contact (611), a stationary contact (612), and a contact spring (614). The moving contact (611) is disposed on the contact support (613), and the contact spring (614) is provided between the contact support (613) and the moving contact (611). The contact support (613) is rotatably installed inside the circuit breaker pole. The operating mechanism (22) is connected to the contact support (613) of the active pole (2). The moving contacts (611) of two adjacent circuit breaker poles are linked together through the contact support (613).

10. A plug-in circuit breaker according to claim 9, characterized in that: An arc-extinguishing device is also provided in each circuit breaker pole. The contact mechanism also includes an insulating baffle (615). The stationary contact (612) is fixed in the circuit breaker pole and is opposite to the moving contact (611). The insulating baffle (615) is located between the contact mechanism and the arc-extinguishing chamber (631) of the arc-extinguishing device, and is located above the stationary contact (612). The moving contact (611) of the contact mechanism passes through the insulating baffle (615) and extends into the arc-extinguishing chamber (631).

11. A plug-in circuit breaker according to claim 5, characterized in that: A cavity for assembling a surge protection module (66) is reserved in the mounting cavity. The opening of the cavity faces outward, so that the surge protection module (66) can be assembled into the mounting cavity from one side of the housing (1). The openings of the cavities of each circuit breaker pole face the same side of the housing (1), thereby forming a second mounting groove (13) spanning each mounting cavity on one side of the housing (1). The second circuit board (53) is installed in the second mounting groove (13), and the second cover plate (14) covers the second mounting groove (13).

12. A plug-in circuit breaker according to claim 6, characterized in that: A first mounting groove (11) spanning at least two mounting cavities is provided on one side of the housing (1). A first circuit board (52) is installed in the first mounting groove (11), and a first cover plate (12) covers the first mounting groove (11).

13. A plug-in circuit breaker according to claim 1, characterized in that: The operating component (21) is a button mechanism that is linearly slidably set at one end of the active pole (2).

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