A plug-in circuit breaker

Abstract

The application discloses an insertion type circuit breaker, which comprises at least two parallel circuit breaker poles, and the two ends of each circuit breaker pole are respectively used as a first wiring end and a second wiring end, an arc extinguishing chamber is arranged between the first wiring end and the second wiring end, a current transformer is arranged between the arc extinguishing chamber and the second wiring end, and a lightning protection module is arranged between the current transformer and the second wiring end. Compared with the installation mode that the lightning protection module is assembled in a cabinet, the lightning protection module is directly assembled in the circuit breaker, and the assembly and replacement of the lightning protection module are simplified.

Description

Technical Field

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

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Based on their installation method, they are generally classified into plug-in type, fixed type, and drawer type circuit breakers. Plug-in type circuit breakers are commonly used in the telecommunications industry. With the rapid development of the telecommunications industry, the requirements for the size and function of circuit breakers are becoming increasingly stringent. However, existing plug-in type circuit breakers do not have built-in surge protection modules; instead, the surge protection module is installed inside the cabinet, making assembly and disassembly difficult and hindering the replacement of the surge protection module. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plug-in circuit breaker with a built-in lightning protection module.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A plug-in circuit breaker includes at least one circuit breaker pole, with its two ends serving as a first terminal and a second terminal, respectively. An operating mechanism, a contact mechanism, and an arc-extinguishing chamber are provided between the first terminal and the second terminal of the at least one circuit breaker pole. An operating element is also provided at the first terminal of the circuit breaker pole, which is linked with the operating mechanism to drive the opening and closing of the circuit breaker. A current transformer is provided between the arc-extinguishing chamber and the second terminal, and a lightning protection module is provided between the current transformer and the second terminal.

[0006] Furthermore, it includes at least two circuit breaker poles arranged in parallel, the at least two circuit breaker poles including an N-phase pole and at least one L-phase pole, the N-phase pole does not have a current transformer, and the lightning protection module is arranged between the arc-extinguishing chamber of the N-phase pole and the outgoing terminal.

[0007] Furthermore, a circuit board is provided on one side of the lightning protection module, and the lightning protection module is connected to the circuit board for connection to the main line of the circuit breaker pole.

[0008] Furthermore, it includes at least two circuit breaker poles arranged in parallel. An operating mechanism and a contact mechanism are provided between the first terminal and the second terminal of each circuit breaker pole. The contact mechanism includes a moving contact and a stationary contact that cooperate with each other. The operating mechanism is connected to the moving contact and drives the moving contact to perform opening and closing actions. The operating mechanisms of adjacent two circuit breaker poles are linked together.

[0009] Furthermore, the operating mechanism includes a linkage component, a support component, a trip latch, a locking latch, a first link, and a second link. The linkage component and the support component are rotatably assembled in the middle of the circuit breaker pole. The trip latch and the locking latch are rotatably assembled on the support component. One end of the trip latch and the locking latch are fastened together. The linkage component is connected to the operating component through the first link and is linked to the support component through the second link. The support component is connected to the moving contact. The linkage components of all circuit breaker poles are linked together through a linkage shaft, and the locking latches of two adjacent circuit breaker poles are linked together.

[0010] Furthermore, each circuit breaker pole is equipped with a tripping device connected to the lightning protection module. When the lightning protection module fails, the tripping device triggers the operating mechanism to trip.

[0011] Furthermore, a tripping device is installed in one of the circuit breaker poles, and the lightning protection modules of at least two circuit breaker poles are connected to the same tripping device. When any lightning protection module fails, the tripping device triggers the operating mechanism of the circuit breaker pole to trip and drives the operating mechanisms of other circuit breaker poles to trip.

[0012] Furthermore, the tripping device and the arc-extinguishing chamber are arranged side by side between the contact mechanism and the second terminal, with one end of the tripping device facing the latch of the operating mechanism.

[0013] Furthermore, the tripping device includes a short-circuit protection element, the coil of which is electrically connected to a second terminal provided at the second terminal via a flexible connection, and a current transformer is connected to the flexible connection.

[0014] Furthermore, the at least two circuit breaker poles include an N-phase pole and at least one L-phase pole, and a tripping device is provided in one of the L-phase poles. The tripping device is connected to the lightning protection module of each circuit breaker pole. An overload protection mechanism is also provided in the L-phase pole. The overload protection mechanism is located on one side of the operating mechanism. The overload protection mechanism and the tripping device are located on both sides of the operating mechanism, respectively.

[0015] Furthermore, a first terminal block is provided at the first terminal block. One end of the first terminal block is provided with a stationary contact and extends along the side of the N-phase pole to one side of the operating mechanism as a stationary contact that cooperates with the moving contact.

[0016] Furthermore, an electric operating module is provided between two adjacent circuit breaker poles. The electric operating module is driven by the control circuit board of the circuit breaker. The electric operating module cooperates with the operating mechanism of one of the circuit breaker poles to realize the automatic opening and closing of the circuit breaker.

[0017] Furthermore, a first wiring port is provided at the first terminal of each circuit breaker pole, and an operating member hole is provided on one side of the first wiring port. An operating member is installed in the operating member hole. The operating member includes a button that is slidably disposed in the first wiring port, and a separation part is provided between the operating member and the first wiring port.

[0018] Furthermore, the device includes a housing comprising multiple partitioned mounting cavities for accommodating each circuit breaker pole. Each mounting cavity for a surge protection module is pre-installed within its mounting cavity. The openings of these cavities are arranged side-by-side on the same side of the housing, forming a mounting slot spanning the openings. The surge protection module is mounted in the corresponding cavity of each circuit breaker pole via the mounting slot. The surge protection modules for the multiple circuit breaker poles are electrically connected to the same circuit board, which is installed in the mounting slot, which is covered by a cover plate.

[0019] The present invention provides a plug-in circuit breaker, which, compared to the installation method of mounting the surge protection module in the cabinet, directly mounts the surge protection module in the circuit breaker, located between the current transformer and the second terminal, thus simplifying the assembly and replacement of the surge protection module.

[0020] In addition, the cavity openings for assembling surge protection modules in all circuit breaker poles are located on the same side, forming a mounting slot on the outer casing that allows for direct external assembly of all surge protection modules. In particular, all surge protection modules can be pre-connected to the same circuit board before being assembled as a whole, simplifying the assembly process and further improving assembly convenience.

[0021] In addition, an electric control module that is linked to the operating mechanism is installed between two adjacent L-phase poles, enabling the circuit breaker to automatically open and close. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a plug-in circuit breaker according to the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a plug-in circuit breaker according to the present invention;

[0024] Figure 3 This is an exploded view of a plug-in circuit breaker according to the present invention;

[0025] Figure 4 This is a circuit diagram of a plug-in circuit breaker according to the present invention (including multiple tripping devices);

[0026] Figure 5 This is a circuit diagram of a plug-in circuit breaker according to the present invention (including a tripping device);

[0027] Figure 6 This is a schematic diagram of the mounting slot in a plug-in circuit breaker according to the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the L-phase pole in a plug-in circuit breaker according to the present invention;

[0029] Figure 8 yes Figure 7 The main view;

[0030] Figure 9 This is a schematic diagram of the structure of the N-phase pole in a plug-in circuit breaker according to the present invention;

[0031] Figure 10 yes Figure 9 Front view (excluding conductive structures). Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1 to 10 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.

[0033] An embodiment of a circuit breaker, wherein the circuit breaker is a plug-in type circuit breaker, includes a housing 1, and at least one circuit breaker pole is provided in the housing 1. The two ends of the circuit breaker pole serve as a first terminal and a second terminal, respectively. A first terminal has a first connection port and a corresponding first terminal block. A second terminal has a second connection port, which is a plug-in structure. A second terminal block with a busbar clamp 7721 is correspondingly provided within the second terminal block. An operating mechanism 74 and a contact mechanism are provided between the first terminal block and the second terminal block. The operating mechanism 74 is linked to the contact mechanism. The operating mechanism 74 drives the contact mechanism to perform opening and closing actions to control the main line connected between the first and second terminals. An arc-extinguishing chamber 72 is provided between the contact mechanism and the second terminal, and a current transformer 73 is provided between the arc-extinguishing chamber 72 and the second terminal. An operating element 71 is also provided at the first terminal of at least one circuit breaker pole. An operating element hole is provided on one side of the first terminal, and the operating element 71 is installed in the operating element hole. The operating element 71 is linked to the operating mechanism 74 and is used for manually operating the opening and closing of the circuit breaker. In this embodiment, the operating element 71 is a linearly sliding button. One end of the button extends into the circuit breaker pole and is linked to the operating mechanism 74. Pressing the button allows for manual operation of the circuit breaker's opening and closing. Alternatively, in another embodiment, the operating element can be a swing handle mechanism.

[0034] Furthermore, the circuit breaker includes multiple circuit breaker poles arranged in parallel, with the operating mechanisms 74 of adjacent circuit breaker poles linked together. At least one circuit breaker pole is equipped with an operating element 71, or each circuit breaker pole is equipped with an operating element 71, and the operating elements 71 of adjacent circuit breaker poles are linked together to realize the manual opening and closing of the multi-pole circuit breaker. Preferably, a control circuit board and an electric operating module 6 driven by the control circuit board are arranged between two adjacent circuit breaker poles. The electric operating module 6 cooperates with the operating mechanism 74 of one circuit breaker pole, and the operating mechanisms 74 of the other circuit breaker poles are driven to realize the automatic opening and closing of the circuit breaker. Automatic opening and closing can be achieved by setting up only one electric operating module 6.

[0035] One improvement of this application is that a surge protection module 5 is connected in the main line of the circuit breaker pole. The surge protection module 5 is located between the current transformer 73 and the second terminal. By embedding the surge protection module 5 in the circuit breaker, the assembly of the surge protection module 5 is simplified, which is conducive to assembly and replacement.

[0036] Preferably, when at least two circuit breaker poles are arranged in parallel, the surge protection modules 5 of the two adjacent circuit breaker poles are connected in parallel. The at least two circuit breaker poles include an N-phase pole 3 and at least one L-phase pole 2. No current transformer 73 is provided in the N-phase pole 3, and the surge protection module 5 is arranged between the arc-extinguishing chamber 72 of the N-phase pole 3 and the outgoing terminal 772. Specifically, in this application, the first terminal of each circuit breaker pole is the incoming terminal, and the first terminal and the first terminal provided on the first terminal are the incoming terminal and the incoming terminal 771, respectively. The second terminal is the outgoing terminal, and the second terminal and the second terminal provided on the second terminal are the outgoing terminal and the outgoing terminal 772, respectively. The multiple circuit breaker poles of the circuit breaker include at least one N-phase pole 3 and at least one L-phase pole 2. In the L-phase pole 2, the first pin of the surge protection module 5 is connected to the outgoing terminal 772 of the L-phase pole 2, and the second pin is connected to the outgoing terminal 772 of the N-phase pole 3. In the N-phase pole 3, the first pin and the second pin of the surge protection module 5 are respectively connected to the outgoing terminal 772 of the N-phase pole 3. Of course, when the first terminal is the outgoing terminal 772 and the second terminal is the incoming terminal 771, the first pin of the surge protection module 5 in the L-phase pole 2 is connected to the incoming terminal 771 of the L-phase pole 2, and the second pin is connected to the incoming terminal 771 of the N-phase pole 3. In the N-phase pole 3, the first pin and the second pin of the surge protection module 5 are respectively connected to the incoming terminal 771 of the N-phase pole.

[0037] Another improvement of this application is that the surge protection module 5 cooperates with the tripping device 4 in the circuit breaker to monitor whether the surge protection module 5 is in normal working condition. At least one circuit breaker pole is also provided with a control device 53 for triggering the tripping device 4. The control device 53 is connected to an external power supply to form a control circuit for triggering the tripping device 4. A switching device is connected between the tripping device 4 and the control device 53. When the surge protection module 5 operates due to its surge protection function or malfunctions, the switching device is triggered, causing the control device 53 to trigger the tripping device 4 to drive the operating mechanism 74 to trip. Based on this, it can be determined that the surge protection module 5 is in a faulty state, rendering the circuit breaker unusable and thus improving the safety of the circuit breaker.

[0038] Specifically, the control device 53 is used to connect with an external power supply to form a control circuit for triggering the tripping device 4. The tripping device 4 can be an electromagnetic trip unit. The control device 53 includes a control chip and components such as diodes, and is used to trigger the tripping device 4 to drive the operating mechanism 74 to trip. The switching device is a micro switch 52, which can be a micro switch 52 integrated in the surge protection module 5, or an external micro switch 52 that cooperates with the surge protection module 5. When the surge protection module 5 fails, it triggers the micro switch 52 to close. This is prior art in the field and will not be described in detail here. One improvement of this application is that the switching device that works with the surge protection module 5 is connected between the tripping device 4 and the control device 53. When the surge protection module 5 generates a surge protection action, the surge protection module 5 has already achieved the function of providing surge protection for the circuit breaker. When the switching device is triggered, the control device triggers the tripping device 4, and the circuit breaker trips and disconnects the power, further providing protection for the circuit breaker and giving the circuit breaker dual protection. Or when the surge protection module 5 fails and triggers the switching device, the tripping device 4 is still triggered to trip and disconnect the power of the circuit breaker, providing the circuit breaker with safe operation.

[0039] Preferably, the circuit breaker includes multiple circuit breaker poles equipped with lightning protection modules 5. The operating mechanisms 74 of adjacent circuit breaker poles are linked together. A tripping device 4 is provided in one of the circuit breaker poles. The lightning protection modules 5 of at least two circuit breaker poles are connected to the same tripping device 4 through their respective switching devices. Multiple lightning protection modules 5 share one tripping device 4, which not only saves space but also reduces costs. Preferably, only one circuit breaker pole is equipped with a tripping device 4, and the other circuit breaker poles are not equipped with tripping devices 4. The control circuits of the lightning protection modules 5 of each circuit breaker pole are all connected to the same tripping device 4. When one of the lightning protection modules 5 performs a lightning protection action or malfunctions, the tripping mechanism 4 triggers the corresponding operating mechanism 74 to trip, and the operating mechanism 74 drives the other operating mechanisms 74 to trip. Preferably, the tripping device 4 is set in one L-phase pole 2. Obviously, as another embodiment, a tripping device 4 that cooperates with the operating mechanism 74 can also be set in each circuit breaker pole, and the tripping devices 4 in each circuit breaker pole are connected in parallel.

[0040] Preferably, the circuit breaker further includes a circuit board 51, and a control device 53 for each circuit breaker pole is mounted on the circuit board 51. In addition to acquiring signals from the surge protection module 5, the control device 53 can also acquire signals from other internal devices (such as the current transformer 73) and transmit them externally. Furthermore, the control device 53 has functions such as remotely controlling the circuit breaker's on / off state, controlling the electrical control module 6, and acquiring external control signals. The switching device is electrically connected to the circuit board 51, which connects the tripping device 4 and the control device 53. The surge protection module 5 is connected to the circuit board 51 and connected to the main circuit of the corresponding circuit breaker pole. The control device 53 is connected to an external power source through the circuit board 51, simplifying wiring. Preferably, the surge protection modules 5 and switching devices for multiple circuit breaker poles are electrically connected to the same circuit board 51, which not only facilitates wiring but also allows for sharing a single tripping device 4 and the overall mounting of the surge protection module 5 on the circuit board 51, achieving integrated assembly. Preferably, the surge protection modules 5 of at least two circuit breaker poles are connected to the same control device 53 on the circuit board 51, and the switching devices of at least two circuit breaker poles are connected in parallel between the same tripping device 4 and the same control device 53, sharing the same control device 53 on the circuit board 51.

[0041] Combination Figure 4 , 5 Detailed explanation of the connection relationship between surge protection module 5 and tripping device 4, such as... Figure 4 , 5 As shown, in phase L 2, the first pin of the surge protection module 5 is electrically connected to the output terminal 772 of phase L 2, and the second pin of the surge protection module 5 is electrically connected to the output terminal 772 of phase N 3. In phase N 3, the first pin and the second pin of the surge protection module 5 are electrically connected to the output terminal 772 of phase N 3, respectively.

[0042] like Figure 4 As shown, each circuit breaker pole is equipped with a tripping device 4 that cooperates with the operating mechanism 74. Each circuit breaker pole is equipped with a lightning protection module 5, a control device 53, and a switching device. The switching device is a micro switch 52. The control device 53 includes a control chip and components such as diodes. The control device 53 is connected to an external power supply to form a control circuit for controlling the tripping device 4. The micro switch 52 is connected between the control device 53 and the tripping device 4. The on / off state of the control circuit is controlled by the micro switch 52. Preferably, both the micro switch 52 and the control device 53 are located in... On a circuit board 51, the first pin of the micro switch 52 is connected to the first pin of the tripping device 4, and the second pin of the micro switch 52 is connected to the first pin of the control device 53. The second pin of the control device 53 is connected to an external power supply through the circuit board 51, and the second pin of the tripping device 4 is directly connected to the circuit board 51. At this time, the first pin and the second pin of the tripping device 4 are not at the same potential. When the lightning protection module 5 generates a lightning protection action or a fault occurs, causing the micro switch 52 to close, the control circuit is turned on, causing the control device 53 to drive the tripping device 4 to trigger the operating mechanism 74 to trip.

[0043] Furthermore, such as Figure 5 As shown, when only one L-phase pole 2 is equipped with a tripping device 4, the first pins of the microswitches 52 of all surge protection modules 5 are first connected in parallel through the circuit board 51, and then connected to the first pin of the tripping device 4. The second pins of the switching devices of each circuit breaker pole are connected to the first pins of the corresponding control devices 53 through the circuit board 51 or to the same control device 53. The second pins of the control devices 53 are connected to the external power supply through the circuit board 51. The second pins of the tripping device 4 are connected to the circuit board 51. The circuit board 51 is electrically connected to the outgoing terminals 772 of each circuit breaker pole. When one of the surge protection modules 5 generates a surge protection action or a fault occurs, the microswitch 52 of the surge protection module 5 closes, causing the control circuit controlled by the microswitch 52 to conduct. After obtaining external power, the tripping device 4 triggers the operating mechanism 74 to trip. The operating mechanisms 74 of other circuit breaker poles also trip under the linkage action.

[0044] Preferably, the circuit board 51 is disposed on one side of the surge protection module 5 and is disposed throughout each circuit breaker pole, that is, all surge protection modules 5 share one circuit board 51, which simplifies the wiring process.

[0045] Furthermore, such as Figure 6As shown, the housing 1 includes multiple partitioned mounting cavities for accommodating each circuit breaker pole. Each mounting cavity for the circuit breaker pole has a pre-reserved chamber a for assembling a surge protection module 5. The openings of the multiple chambers a are arranged side-by-side on the same side of the housing 1, forming a mounting groove 11 spanning the multiple chamber openings. The surge protection module 5 is assembled into the corresponding chamber a of each circuit breaker pole via the mounting groove 11. The circuit board 51 is installed in the mounting groove 11, which is covered by a cover plate 12. Preferably, the direction of the chamber openings is perpendicular to the direction in which the circuit breaker is inserted into the cabinet. This structure facilitates the assembly of the surge protection module 5. Furthermore, when multiple surge protection modules 5 share a single circuit board 51, the mounting groove 11 on one side of the housing 1 also facilitates the assembly of the circuit board 51.

[0046] Combination Figure 1-3 6-10 provides an embodiment of the layout structure of a circuit breaker. In this embodiment, the circuit breaker includes four circuit breaker poles arranged in parallel, one of which is an N-phase pole 3 and the other three are L-phase poles 2.

[0047] like Figure 2 , 3 As shown in Figures 7 and 8, the L-phase electrode 2 includes an L-phase housing 21, which includes a top cover and a base. The two ends of the L-phase housing 21 serve as an inlet and an outlet, respectively. An inlet port and an outlet port are provided at the inlet and outlet ports, respectively. An inlet terminal 771 and an outlet terminal 772 are provided at the inlet and outlet ports, respectively. An operating hole is provided on one side of the inlet port. An operating component 71 that slides with the L-phase housing 21 is installed in the operating hole. The operating component 71 and the outlet terminal 772 are arranged on the same side of the L-phase electrode 2, and the operating components 71 of two adjacent L-phase electrodes 2 are linked together.

[0048] An operating mechanism 74, a contact mechanism, an arc-extinguishing chamber 72, a current transformer 73, and a surge protection module 5 are provided between the incoming terminal 771 and the outgoing terminal 772. The operating mechanism 74 and the contact mechanism are located in the middle of the L-phase pole 2. The contact mechanism includes a moving contact 751 and a stationary contact 752 that cooperate with each other. The moving contact 751 is connected to the operating mechanism 74, and the stationary contact 752 is fixedly installed on one side of the L-phase housing 21. The arc-extinguishing chamber 72, the current transformer 73, and the surge protection module 5 are sequentially arranged between the contact mechanism and the outgoing terminal 772. Furthermore, an overload protection mechanism 76 is also provided on one side of the operating mechanism 74. The overload protection mechanism 76 cooperates with the operating mechanism 74 and triggers the operating mechanism 74 to trip in the event of an overload fault. Figure 3As shown, an electric operating module 6 is provided between two adjacent L-phase poles 2. The electric operating module 6 is driven and controlled by a control circuit board (not shown). In this embodiment, the control circuit board can be composed of a circuit board 51 and a control device 53 disposed on the circuit board 51. All lightning protection modules 5 share one control device 53. A connecting hole is provided on the side wall of one of the L-phase housings 21. The electric operating module 6 passes through the connecting hole and is linked to the operating mechanism 74 of the L-phase pole 2. The electric operating module 6 includes a motor 61 and a gear set 62. The motor 61 is driven and connected to the control circuit board. The output end of the motor 61 is meshed with the gear set 62. The gear set 62 includes at least an output gear and several transmission gears that are transmitted between the motor 61 and the output gear. The output gear passes through the connecting hole and extends into the L-phase pole 2 to mesh with the linkage 741 of the operating mechanism 74. When the motor 61 is driven to rotate in the forward or reverse direction, the circuit breaker is driven to automatically open and close.

[0049] Specifically, the operating component 71 includes a button and a connector. One end of the button is slidably fitted into the hole of the operating component, and the other end of the button is connected to the connector disposed inside the L-phase housing 21 via a connecting rod. The connector is linked to the operating mechanism 74. Alternatively, the operating component 71 is an integral mechanism, with one end extending into the L-phase housing 21 linked to the operating mechanism 74. Figure 3 , 6 As shown in Figure 8, a limiting part is provided between the operating member hole and the inlet of the L-phase housing 21. This limiting part is used to isolate the operating member 71 from the inlet terminal 771, preventing wire entanglement and operational inconvenience. Preferably, the limiting part includes a connecting arm 131 protruding from the L-phase housing 21 and a limiting shaft 132 disposed on the connecting arm 131. The limiting shaft 132 separates the operating member 71 from the inlet. Figure 6 , 8 As shown, the connecting arm 131 is provided only on the two circuit breaker poles located on the side (i.e., located on an L-phase pole 2 and an N-phase pole 3 respectively), and a limiting shaft 132 is provided between the two connecting arms 131, so that the operating parts 71 of all circuit breaker poles are shared and separated by the same limiting shaft 132.

[0050] The operating mechanism 74 includes a linkage 741, a support, a trip latch, a locking latch 742, a first link, and a second link. The linkage 741 and the support are rotatably mounted in the middle of the circuit breaker pole. The moving contact 751 is connected to the support. The trip latch and the locking latch 742 are rotatably mounted on the support. One end of the trip latch and the locking latch 742 are fastened together. The locking latch 742 includes a first cantilever and a second cantilever. A release hook is provided on the second cantilever. The first link and the second link are respectively provided on the linkage 741. The linkage 741 is connected to the operating component 71 through the first link. The linkage 741 is linked to the support through the second link. A gear tooth is provided on the side of the linkage 741 facing the inlet. The gear tooth is used to mesh with the output gear of the electric operating module 6. The support is connected to the moving contact 751. The linkages 741 of all circuit breaker poles are linked together through a linkage shaft 743. The locking latches 742 of two adjacent circuit breaker poles are linked together.

[0051] like Figure 7 , 8 As shown, the overload protection mechanism 76 is located on one side of the operating mechanism 74. Preferably, the overload protection mechanism 76 and the stationary contact 752 are located on the same side of the L-phase housing 21. The overload protection mechanism 76 includes a bimetallic strip. The movable end of the bimetallic strip is opposite to the trip hook of the latch 742. When an overload fault occurs, the bimetallic strip is heated and bent to cooperate with the trip hook to trip the operating mechanism 74.

[0052] A tripping device 4 is provided in at least one L-phase pole 2, such as Figure 8 As shown, the tripping device 4 and the arc-extinguishing chamber 72 in the L-phase pole 2 are arranged side by side between the contact mechanism and the current transformer 73. Preferably, the tripping device 4 and the overload protection mechanism 76 are located on both sides of the operating mechanism 74. The tripping device 4 includes a short-circuit protection element, which includes a coil 41 and a moving iron core driven by the coil 41. One end of the moving iron core is opposite to the first cantilever of the latch 742. The coil 41 is connected to the output terminal 772 through a flexible connection. The current transformer 73 is connected to the flexible connection and transmits the collected current signal to the control circuit board. Of course, when the tripping device 4 is not provided in the L-phase pole 2, the output terminal 772 and the moving contact 751 are electrically connected through a flexible connection, and the current transformer 73 is also connected to the flexible connection to collect the current signal.

[0053] like Figure 6 , 7 As shown, a cavity a for assembling the surge protection module 5 is reserved in the middle of the L-phase housing 21. The cavity a is located between the current transformer 73 and the outgoing terminal 772. The opening of the cavity a faces outward from the L-phase housing 21. The cavity openings of adjacent L-phase poles 2 are arranged side by side. All the openings of the cavity a can be covered by a cover plate 12.

[0054] The first pin of the surge protection module 5 is connected to the output terminal 772 of the L-phase pole 2, and the second pin is connected to the output terminal 772 of the N-phase pole 3. Preferably, a circuit board 51 is provided on one side of the surge protection module 5. The circuit board 51 is arranged through the inner side of the cover plate 12 on one side of all surge protection modules 5. The first pin and the second pin of the surge protection module 5 are respectively connected to the circuit board 51. The surge protection modules 5 of two adjacent L-phase poles 2 are connected in parallel through the circuit board 51. When a tripping device 4 is provided in all L-phase poles 2, each tripping device 4 is connected to the circuit board 51, thereby connecting to the surge protection module 5 of each L-phase pole 2. When only one tripping device 4 is provided in one L-phase pole 2, the first pin of the micro switch 52 in all surge protection modules 5 is connected to the first pin of the tripping device 4 after being connected in parallel through the circuit board 51, and the second pin of the tripping device 4 is directly connected to the circuit board 51.

[0055] In this embodiment, the outgoing terminal 772 includes a bus clamp 7721 and a connecting plate 7722. The bus clamp 7721 is welded to one end of the connecting plate 7722. The bus clamp 7721 is disposed inside the outgoing port and can be connected to an external conductor by plugging and unplugging. The connecting plate 7722 is disposed along the inner side of the L-phase housing 21 and is connected to the moving contact 751 via a flexible connection. Preferably, the other end of the connecting plate 7722 is disposed along one side of the surge protection module 5 and bent towards the end parallel to the surge protection module 5. Figure 7 In the middle, the connecting plate 7722 is first set along the right side of the lightning protection module 5, and then bent and extended into the arc-extinguishing chamber 72 and parallel to the end of the lightning protection module 5 facing the arc-extinguishing chamber 72. Of course, the other end of the connecting plate 7722 can also be located at the end of the lightning protection module 5 away from the arc-extinguishing chamber 72 and remain parallel to that end.

[0056] Combination Figure 2 , 3Sections 9 and 10 detail the N-phase pole 3, which is the outermost circuit breaker pole. The N-phase pole 3 includes an N-phase housing 31 formed by a top cover and a base. The N-phase pole 3 is attached to one side of the outermost L-phase pole 2 via the N-phase housing 31. An inlet and an outlet are respectively provided at both ends of the N-phase housing 31. An operating hole is provided on one side of the inlet, and an operating component 71 identical to that of the L-phase pole 2 is installed in the operating hole. The operating component 71 of the N-phase pole 3 is linked to the operating component 71 of the adjacent L-phase pole 2. Similar to the L-phase pole 2, at the inlet... An operating mechanism 74, a contact mechanism, an arc-extinguishing chamber 72, and a surge protection module 5 are provided between the N-phase terminal and the outlet. The operating mechanism 74 is linked to the moving contact 751 of the contact mechanism and is located in the middle of the N-phase housing 31. The arc-extinguishing chamber 72 is located between the outlet terminal 772 and the contact mechanism. Unlike the L-phase pole 2, the N-phase pole 3 does not have a current transformer 73 and an overload protection mechanism 76. The surge protection module 5 is located between the arc-extinguishing chamber 72 and the outlet terminal 772. The first and second pins of the surge protection module 5 are electrically connected to the inlet terminal 771 and the outlet terminal 772, respectively. In addition, the moving contact 751 can be formed by stacking two or more moving contacts 751 to increase the current carrying capacity.

[0057] Furthermore, one end of the incoming terminal 771 of the N-phase pole 3 is provided with a stationary contact that extends along the inner side of the N-phase housing 31 to one side of the operating mechanism 74 as a stationary contact 752 that cooperates with the moving contact 751. The outgoing terminal 772 of the N-phase pole 3 also includes a bus clamp 7721 and a connecting plate 7722. The bus clamp 7721 is located inside the outgoing port and is connected to the external PE line. The connecting plate 7722 is welded to one end of the bus clamp 7721 and is arranged along one side that is attached to the surge protection module 5. Figure 9 In this configuration, the connecting plate 7722 is fitted to the upper surface of the surge protection module 5, and the other end of the connecting plate 7722 is parallel to one end of the surge protection module 5 and connected to the moving contact 751 via a flexible connection. Furthermore, a socket structure can be provided on one side of the outlet, and a conductive structure connected in parallel with the bus clamp 7721 can be provided in the socket structure to increase the current carrying capacity.

[0058] In addition, a tripping device 4 identical to that of the L-phase pole 2 can also be provided in the N-phase pole 3. The tripping device 4 is arranged in parallel with the arc-extinguishing chamber 72. One end of the tripping device 4 is opposite to the latch 742 of the operating mechanism 74. The lightning protection module 5 of the N-phase pole 3 is connected to the tripping device 4 of the N-phase pole 3.

[0059] like Figure 2As shown, a chamber a for assembling the surge protection module 5 is also reserved inside the N-phase housing 31. The opening of the chamber a is arranged in parallel with the opening of the chamber in the L-phase housing 21. The chamber a of the N-phase pole 3 and the chamber a of all the L-phase poles 2 together form the mounting groove 11. In this way, all surge protection modules 5 can be arranged in parallel on the circuit board 51 first, and then assembled into each circuit breaker pole together, simplifying the assembly and wiring process.

[0060] 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 at least two parallel circuit breaker poles, the two ends of which serve as a first terminal and a second terminal, respectively. An operating mechanism, a contact mechanism, and an arc-extinguishing chamber (72) are provided between the first terminal and the second terminal of each circuit breaker pole. An operating element (71) is also provided at the first terminal of the circuit breaker pole. The operating element (71) is linked with the operating mechanism (74) to drive the circuit breaker's opening and closing. The contact mechanism includes a moving contact (751) and a stationary contact (752) that cooperate with each other. The operating mechanism (74) is connected to the moving contact (751) and drives the moving contact (751) to perform opening and closing actions. The operating mechanisms (74) of adjacent circuit breaker poles are linked and connected. The circuit breaker is characterized in that: The at least two circuit breaker poles include an N-phase pole (3) and at least one L-phase pole (2). In the L-phase pole (2), a current transformer (73) is provided between the arc-extinguishing chamber (72) and the second terminal, and a lightning protection module (5) is provided between the current transformer (73) and the second terminal. The N-phase pole (3) is provided with an operating mechanism (74), a contact mechanism, and an arc-extinguishing chamber (72), but no current transformer (73) is provided. A lightning protection module (5) is provided between the arc-extinguishing chamber (72) of the N-phase pole (3) and the outgoing terminal (772). An overload protection mechanism (76) is also provided in the L-phase pole (2). The overload protection mechanism (76) is located on one side of the operating mechanism (74). At least one L-phase pole (2) is provided with a tripping device (4). When the lightning protection module (5) fails, the tripping device (4) triggers the operating mechanism (74) to trip. The tripping device (4) and the arc-extinguishing chamber (72) are arranged side by side between the contact mechanism and the current transformer (73). One end of the tripping device (4) is opposite to the latch (742) of the operating mechanism (74). The overload protection mechanism (76) and the tripping device (4) are located on both sides of the operating mechanism (74). The tripping device (4) includes a short-circuit protection element. The coil (41) of the short-circuit protection element is electrically connected to the second terminal provided at the second terminal through a flexible connection. The current transformer (73) is connected to the flexible connection.

2. The plug-in circuit breaker according to claim 1, characterized in that: A circuit board (51) is provided on one side of the lightning protection module (5), and the lightning protection module (5) is connected to the circuit board (51) for connection to the main line of the circuit breaker pole.

3. A plug-in circuit breaker according to claim 2, characterized in that: The operating mechanism (74) includes a linkage (741), a support, a trip latch, a latch (742), a first link, and a second link. The linkage (741) and the support are rotatably assembled in the middle of the circuit breaker pole. The trip latch and the latch (742) are rotatably assembled on the support. One end of the trip latch and the latch (742) are fastened together. The linkage (741) is connected to the operating component (71) through the first link. The linkage (741) is linked to the support through the second link. The support is connected to the moving contact (751). The linkages (741) of all circuit breaker poles are linked together through a linkage shaft (743). The latches (742) of two adjacent circuit breaker poles are linked together.

4. A plug-in circuit breaker according to claim 1, characterized in that: Each circuit breaker pole is provided with a tripping device (4) connected to the lightning protection module (5).

5. A plug-in circuit breaker according to claim 1, characterized in that: A tripping device (4) is installed in one of the circuit breaker poles. At least two lightning protection modules (5) of the circuit breaker poles are connected to the same tripping device (4). When any lightning protection module (5) fails, the tripping device (4) triggers the operating mechanism (74) of the circuit breaker pole to trip and drives the operating mechanisms (74) of other circuit breaker poles to trip.

6. A plug-in circuit breaker according to claim 1, characterized in that: A first terminal block is provided at the first terminal block. One end of the first terminal block is provided with a stationary contact and extends along the side of the N-phase pole (3) to one side of the operating mechanism (74) as a stationary contact (752) to cooperate with the moving contact (751).

7. A plug-in circuit breaker according to claim 1, characterized in that: An electric control module (6) is provided between two adjacent circuit breaker poles. The electric control module (6) is driven by the control circuit board of the circuit breaker. The electric control module (6) cooperates with the operating mechanism (74) of one of the circuit breaker poles to realize the automatic opening and closing of the circuit breaker.

8. A plug-in circuit breaker according to claim 1, characterized in that: A first terminal is provided at the first terminal of each circuit breaker pole, and an operating hole is provided on one side of the first terminal. An operating component (71) is installed in the operating hole. The operating component (71) includes a button that is slidably disposed in the first terminal. A partition is provided between the operating component (71) and the first terminal.

9. A plug-in circuit breaker according to claim 1, characterized in that: The device includes an outer casing (1), which includes multiple partitioned mounting cavities for accommodating each circuit breaker pole. Each mounting cavity of the circuit breaker pole has a reserved chamber (a) for assembling a lightning protection module (5). The openings of the multiple chambers (a) are arranged side by side on the same side of the outer casing (1) to form a mounting groove (11) spanning the openings of the multiple chambers. The lightning protection module (5) is assembled in the chamber (a) of each circuit breaker pole through the mounting groove (11). The lightning protection modules (5) of the multiple circuit breaker poles are electrically connected to the same circuit board (51). The circuit board (51) is installed in the mounting groove (11), which is covered by a cover plate (12).

10. A plug-in circuit breaker according to claim 9, characterized in that: The direction of the chamber opening is perpendicular to the direction in which the circuit breaker is inserted into the cabinet.

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