Circuit breaker and communication circuit thereof

Abstract

The utility model discloses a circuit breaker and communication circuit thereof, including first communication connection module and second communication connection module, first communication connection module passes through at least part first pin connection at least two way communication channel, so that circuit breaker can first communication connection module realizes the connection of two external devices, and the expandability of communication circuit of circuit breaker and external device connection is improved. Second communication connection module passes through at least part second pin connection at least one way communication channel, so that circuit breaker can connect more external devices through communication circuit, and the expandability of communication circuit of circuit breaker and external device connection is further improved.

Description

Technical Field

[0001] This utility model relates to the field of power electronic equipment technology, and in particular to a circuit breaker and its communication circuit. Background Technology

[0002] Circuit breakers are widely used in power systems.

[0003] In the existing technology, circuit breakers have more and more functions, such as communication functions and power metering functions. Accordingly, corresponding communication interfaces need to be set on the circuit breakers.

[0004] However, existing technologies still suffer from insufficient scalability in connecting circuit breakers to external devices. Utility Model Content

[0005] This invention provides a circuit breaker and its communication circuit breaker to improve the expandability of the circuit breaker's connection with external devices.

[0006] According to one aspect of the present invention, a communication circuit for a circuit breaker is provided, comprising: a first communication connection module and a second communication connection module, wherein the first communication connection module includes a plurality of first pins, and the first communication connection module connects to at least two communication channels through at least some of the first pins.

[0007] The second communication connection module includes multiple second pins, and the second communication connection module connects to at least one communication channel through at least some of the second pins.

[0008] Optionally, the multiple first pins include a first channel connection pin and a second channel connection pin, wherein the first channel connection pin is connected to a first communication channel, the second channel connection pin is connected to a second communication channel, and the first communication channel and the second communication channel are isolated from each other.

[0009] Optionally, the communication circuit of the circuit breaker also includes a switch module, which is connected to the first channel connection pin and the second channel connection pin respectively. The switch module is used to control the connection state between the first channel connection pin and the second channel connection pin.

[0010] Optionally, the first communication connection module includes an RJ45 interface or a terminal block.

[0011] Optionally, the first communication connection module includes a USB interface, and a signal conversion module is connected between the USB interface and the communication channel. The signal conversion module is used to realize signal conversion between the USB interface and the communication channel.

[0012] Optionally, the second communication connection module includes a terminal block, the terminal block includes a third channel connection pin, and the third channel connection pin is connected to a third communication channel.

[0013] Optionally, the terminal block may also include a metering pulse output pin, which is used to connect to the energy metering module in the circuit breaker.

[0014] Optionally, the communication channel includes a communication chip and a digital isolator. The communication chip includes a first connection end and a second connection end. The first connection end is connected to a first communication connection module or a second communication connection module, and the second connection end of the communication chip is connected to the digital isolator.

[0015] Optionally, the communication channel can be an RS485 channel, a CAN channel, or an Ethernet channel.

[0016] According to another aspect of the present invention, a circuit breaker is provided, optionally including a communication circuit of the circuit breaker in any embodiment of the present invention.

[0017] The circuit breaker and its communication circuit according to this embodiment include a first communication connection module and a second communication connection module. The first communication connection module connects to at least two communication channels through at least a portion of its first pins, enabling the circuit breaker to connect to two types of external devices, thus improving the scalability of the circuit breaker's communication circuit and its connection to external devices. The second communication connection module connects to at least one communication channel through at least a portion of its second pins, enabling the circuit breaker to connect to more external devices through its communication circuit, further improving the scalability of the circuit breaker's communication circuit and its connection to external devices.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the communication circuit of a circuit breaker provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the circuit structure of another circuit breaker provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the RJ45 interface.

[0023] Figure 4This is a schematic diagram showing the connection between the first channel connection pin and the first communication channel;

[0024] Figure 5 This is a schematic diagram showing the connection between the second channel connection pin and the second communication channel;

[0025] Figure 6 This is a schematic diagram showing the connection between the third channel connection pin and the third communication channel;

[0026] Figure 7 This is a schematic diagram of the bottom surface of the circuit breaker provided in this embodiment of the utility model. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Figure 1 This is a schematic diagram of the communication circuit of a circuit breaker according to an embodiment of the present invention. The communication circuit of this circuit breaker is used in circuit breakers, which can be applied in photovoltaic power generation systems, intelligent distribution boxes, energy storage controllers, microgrid management units, intelligent charging piles, etc. (Reference) Figure 1 The communication circuit of the circuit breaker includes a first communication connection module 100 and a second communication connection module 200. The first communication connection module 100 includes a plurality of first pins P1, and the first communication connection module 100 is connected to at least two communication channels 300 through at least some of the first pins P1. The second communication connection module 200 includes a plurality of second pins P2, and the second communication connection module 200 is connected to at least one communication channel 300 through at least some of the second pins P2.

[0030] The first communication connection module 100 and the second communication connection module 200 may include connection interfaces or connection terminals, or other connection structures. In some embodiments, the connection structures included in the first communication connection module 100 and the second communication connection module 200 are pluggable connection structures, allowing external devices to be pluggably connected to the circuit breaker through the first communication connection module 100 or the second communication connection module 200.

[0031] The first communication connection module 100 includes multiple first pins P1, which may be metal pins. The circuit breaker can connect to external devices through the first pins P1 of the first communication connection module 100. In this embodiment, the communication circuit may further include multiple communication channels 300. The first communication connection module 100 connects to at least two communication channels 300 through at least some of the first pins P1. Optionally, the communication channels 300 may be RS485 channels, CAN channels, or Ethernet channels. The communication channels 300 can connect to the control module inside the circuit breaker. When the first communication connection module 100 is connected to external devices, the control module inside the circuit breaker can connect to the external devices through the communication channels 300 and the first pins P1. By setting the first communication connection module 100 to connect to at least two communication channels 300, the circuit breaker can achieve connections to two types of external devices through the first communication connection module 100, improving the scalability of the circuit breaker's communication circuit and its connection to external devices. For example, when the circuit breaker is used in a photovoltaic power generation system, the circuit breaker can be connected to the inverter through two first pins P1 of the first communication connection module 100, and connected to a data acquisition device through the other two first pins P1 of the first communication connection module 100. The data acquisition device may be, for example, a 4G acquisition stick.

[0032] The second communication connection module 200 includes multiple second pins P2, which can be metal pins. The circuit breaker can connect to external devices, such as a local monitoring terminal, via the second pins P2 of the second communication connection module 200. Through the master-slave port switching function, the master mode receives data from extended devices, while the slave mode can connect to maintenance equipment (such as a computer) for parameter configuration. By including the second communication connection module 200 in the communication circuit, the circuit breaker can connect to more external devices, further improving the scalability of the circuit breaker's communication circuit and its connection to external devices.

[0033] The communication circuit of the circuit breaker in this embodiment includes a first communication connection module and a second communication connection module. The first communication connection module connects to at least two communication channels through at least a portion of its first pins, enabling the circuit breaker to connect to two types of external devices, thus improving the scalability of the circuit breaker's communication circuit and its connection to external devices. The second communication connection module connects to at least one communication channel through at least a portion of its second pins, enabling the circuit breaker to connect to more external devices through its communication circuit, further improving the scalability of the circuit breaker's communication circuit and its connection to external devices.

[0034] Figure 2 This is a schematic diagram of the circuit structure of another circuit breaker provided in this embodiment of the present invention, for reference. Figure 2 Optionally, the multiple first pins include a first channel connection pin P11 and a second channel connection pin P12. The first channel connection pin P11 is connected to the first communication channel 301, and the second channel connection pin P12 is connected to the second communication channel 302. The first communication channel 301 and the second communication channel 302 are isolated from each other.

[0035] Optionally, the first communication channel 301 and the second communication channel 302 can be differential channels. In this case, the first channel has two pins, and the second channel also has two connection pins P12 to achieve differential signal transmission. The first communication channel 301 and the second communication channel 302 are isolated from each other to avoid signal interference between them and ensure the stability and reliability of signal transmission.

[0036] In some embodiments, the first communication connection module 100 includes an RJ45 interface. Figure 3 This is a schematic diagram of the RJ45 interface. (Refer to...) Figure 3 The RJ45 interface includes eight first pins, P1. Referring to Table 1, the pin definitions and functions of the RJ45 interface are as follows:

[0037] Table 1

[0038]

[0039] Pins 1 and 2 serve as a pair of differential signal terminals for one RS485 communication channel 300, namely RS485A1 and RS485B1, while pins 3 and 4 serve as a pair of differential signal terminals for another RS485 communication channel 300, namely RS485A2 and RS485B2. Pins 1 and 2 are the first channel connection pins, which can be connected to the inverter via an adapter cable, allowing the circuit breaker to directly read inverter data. Pins 3 and 4 are the second channel connection pins, which can be connected to a 4G data acquisition device via an adapter cable, allowing the circuit breaker to forward the data acquisition commands from the 4G data acquisition device, thus enabling remote uploading of inverter data. Pins 5, 6, 7, and 8 are reserved.

[0040] In other embodiments, the first communication connection module includes a terminal block, which replaces pins 1 and 2 and pins 3 and 4 in the RJ45 with two sets of independent 3-pin terminals or 4-pin terminals, respectively, which is functionally equivalent to the dual-link design of the RJ45.

[0041] In other alternative embodiments, the first communication connection module includes a USB interface, and a signal conversion module is connected between the USB interface and the communication channel. The signal conversion module is used to realize signal conversion between the USB interface and the communication channel.

[0042] Specifically, the communication channel can be an RS485 channel. In the above embodiment, the RJ45 interface can be replaced with a USB 3.0 interface, along with a signal conversion module. This signal conversion module can be a USB to dual RS485 chip, enabling data transmission and power multiplexing, suitable for scenarios requiring integrated power supply functionality.

[0043] Optionally, the circuit breaker's switching circuit also includes a switching module 400, which is connected to the first channel connection pin P11 and the second channel connection pin P12 respectively. The switching module 400 is used to control the connection state between the first channel connection pin P11 and the second channel connection pin P12.

[0044] Optionally, the switch module 400 includes a relay, an analog switch, or other devices with switching functions. One end of the switch module 400 is connected to a first channel connection pin, and the other end is connected to a second channel connection pin. When the switch module 400 is turned on, the first channel connection pin and the second channel connection pin can be connected, thereby enabling communication between external devices connected to the first channel connection pin and external devices connected to the second channel connection pin, thus achieving communication connections between different external devices, such as communication connections between an inverter and a 4G data acquisition stick. For example, when the external devices connected to the first channel connection pin P11 and the second channel connection pin P12 need to communicate, the control module inside the circuit breaker controls the switch module 400 to turn on, making the first channel connection pin P11 and the second channel connection pin P12 connected. When the pins connected to the first channel connection pin P11 and the second channel connection pin P12 do not need to communicate, the control module inside the circuit breaker controls the switch module 400 to turn off, and the circuit breaker communicates with the corresponding external devices through the first communication channel 301 and the second communication channel 302, respectively.

[0045] Continue to refer to Figure 2 Optionally, the second communication connection module 200 includes a terminal block, which includes a third channel connection pin P13, and the third channel connection pin P13 is connected to the third communication channel 303.

[0046] Specifically, the second communication connection module 200 includes a terminal block. When the first communication connection module 100 includes interfaces of other structural forms, such as an RJ45 interface, this allows the communication circuit to have connection interfaces of different structural forms, facilitating connection between the communication circuit and external devices with different interface types. When the first communication connection module 100 includes a terminal block, the communication circuit can connect to more external devices, improving the scalability of the connection between the communication circuit and external devices. In some embodiments, the RJ45 interface and the terminal block can be integrated into a composite interface (such as an industrial-grade M12 interface), with built-in multiple RS485 channels, power pins, and pulse signal pins, allowing for adaptation to the connection requirements of different devices through interface definition.

[0047] In some embodiments, the terminal block also includes a metering pulse output pin for connecting to the power metering module in the circuit breaker.

[0048] Specifically, the circuit breaker is equipped with an internal energy metering module, which measures energy based on the collected electrical parameters. The metering pulse output pin directly outputs a pulse signal to meet the expansion needs of energy metering products. The terminal block of the second communication connection module can include multiple terminals, each serving as a second pin. The metering pulse output pin and the third channel connection pin P13 can be separated or integrated with a power interface (e.g., 24V power supply), improving interface expandability while maintaining equivalent communication functionality.

[0049] Taking a terminal block with 5 terminals as an example, Table 2 shows the terminal definitions and functions. Referring to Table 2, terminals 1 and 2 are used as metering pulse output terminals. Terminal 1 is the active pulse + terminal, and terminal 2 is the active pulse - terminal, facilitating the adjustment of metering accuracy during equipment production. They can also output standard pulses for external power monitoring equipment. Terminal 3 is a reserved terminal (NC), maintaining a safe distance from other terminals to avoid interference between signals transmitted from different terminals. Terminals 4 and 5 are the third channel connection pins, serving as a pair of differential signal terminals for the third communication channel, namely RS485A and RS485B. Terminals 4 and 5 are the default maintenance ports, supporting master-slave port switching. The master port is used for reading extended devices, and the slave port can be used for equipment maintenance interfaces.

[0050] Table 2

[0051]

[0052] It should be noted that the number of terminals included in the terminal block is not specifically limited in this embodiment. For example, the terminal block may also include 6, 8, etc.

[0053] Figure 4 This is a schematic diagram showing the connection between the first channel connection pin and the first communication channel. Figure 5 This is a schematic diagram showing the connection between the second channel connection pins and the second communication channel. Figure 6 This is a schematic diagram showing the connection between the third channel connection pins and the third communication channel. (Reference) Figures 4-6 Based on the above embodiments, optionally, the communication channel includes a communication chip 310 and a digital isolator 320. The communication chip 310 includes a first connection end and a second connection end. The first connection end is connected to a first communication connection module or a second communication connection module, and the second connection end of the communication chip 310 is connected to the digital isolator 320.

[0054] In this configuration, there are at least one first connection terminal and at least one second connection terminal. When the communication channel is an RS485 communication channel, the communication chip 310 can be an RS485 chip. The communication chip 310 connects to the digital isolator 320, enabling signal isolation between different communication channels and ensuring the stability and reliability of signal transmission. When communication channel 3 is a CAN channel or an Ethernet channel, the RS485 chip needs to be replaced with the corresponding communication chip 310. Taking an RS485 communication channel as an example... Figure 4 The diagram shows that the two first channel connection pins P11 are used as a pair of differential signal terminals, namely RS485A1 and RS485B1. Figure 5 The diagram shows two second channel connection pins P12, which serve as a pair of differential signal terminals, namely RS485A2 and RS485B2. Figure 6 The diagram shows two third-channel connection pins, P21, serving as a pair of differential signal terminals, namely RS485A and RS485B. Combined with... Figures 4-6 The communication chip 310 is also connected to the power input terminal VCC and the ground terminal GND; the digital isolator 320 is also connected to a 3.3V power supply voltage and includes three connection ports, namely the enable terminal EN, the transmit short TX and the receive terminal RX. These three connection ports can be used to connect to the control module inside the circuit breaker.

[0055] The following provides several specific examples of the first and second communication connection modules in the communication circuit of a circuit breaker used in a photovoltaic power generation system.

[0056] Example 1: The first communication connection module includes an RJ45 interface, and the second communication connection module includes a 5P (5 pins) terminal block.

[0057] The RJ45 interface has two built-in independent RS485 channels (first communication channel and second communication channel). The first communication channel is connected to the inverter via a cable, and the second communication channel is connected to the 4G data acquisition stick via a cable to realize the data communication link access.

[0058] 5P terminal: integrates active pulse ±(+ / -), RS485 A / B and reserved function pins, which can be expanded to connect to photovoltaic 4G acquisition rods or other slave devices.

[0059] Implementation of the communication process in Example 1:

[0060] (1) Miniature circuit breaker directly reads inverter data: When the circuit breaker needs to actively obtain inverter data, it triggers the internal hardware control logic to shield the second communication channel (RS485 link corresponding to the photovoltaic 4G acquisition stick) in the RJ45 interface to avoid multiple master devices (circuit breaker, acquisition stick) occupying the bus at the same time and causing conflicts; it sends Modbus-RTU and other protocol commands to the inverter through the first communication channel to complete the data reading (such as power generation, status parameters, etc.); after the reading is completed, the communication permission of the second communication channel is automatically restored, and the photovoltaic 4G acquisition stick can initiate communication normally.

[0061] (2) Forwarding photovoltaic 4G acquisition stick instructions: After the second communication channel is restored: The inverter reading instructions sent by the photovoltaic 4G acquisition stick through RJ45 and the second communication channel are forwarded through the first communication channel link of the circuit breaker and sent to the inverter through the first communication channel; the inverter response data is transmitted back to the acquisition stick along the original path to realize the communication closed loop of "acquisition stick → circuit breaker → inverter → circuit breaker → acquisition stick".

[0062] (3) Pulse signal function: With the active pulse ± interface of the 5P terminal, the standard metering pulse signal is output, which can be connected to the external energy meter calibration equipment or data acquisition module. In conjunction with the communication link, it can realize dual metering and monitoring of "electricity data reading + pulse calibration" to improve the data reliability of photovoltaic system.

[0063] Example 2: Implementation of an Alternative Solution Based on CAN Bus Replacement

[0064] Hardware adaptation adjustments: For photovoltaic power generation systems that require compatibility with CAN bus communication, the interface and protocol of Example 1 are replaced:

[0065] Interface modification: Replace one RS485 channel (such as the second communication channel) and the RS485 A / B pins in the 5P terminal of the RJ45 interface with a CAN bus transceiver module (such as an integrated TJA1051 chip) through hardware circuitry.

[0066] Physical connection: CAN bus slave devices (such as new inverters and intelligent acquisition terminals) are connected to the circuit breaker through customized CAN cables, while another RS485 channel (the first communication channel) is reserved for local reading of circuit breaker data.

[0067] Communication control logic:

[0068] (1) Multi-master communication arbitration

[0069] Utilizing the CAN bus multi-master arbitration mechanism (based on ID priority), both the circuit breaker and the photovoltaic 4G data acquisition stick are configured as CAN master devices. When the circuit breaker reads data locally, it preempts the bus through the high-priority ID. When the data acquisition stick initiates communication, the circuit breaker automatically releases the bus control right, and the CAN protocol resolves the conflict itself without the need for additional hardware shielding.

[0070] (2) Command forwarding and data interaction

[0071] Local circuit breaker reading: Data is obtained directly from the inverter via high-priority CAN commands;

[0072] Data acquisition by the acquisition stick: The acquisition stick sends low-priority CAN commands, which are transmitted through the circuit breaker (or converted according to the protocol, if RS485 slave device needs to be adapted) to the inverter, and the response data is transmitted back along the original path.

[0073] Example 3: An Alternative Implementation Based on Relay Hardware Switching

[0074] ① Hardware adaptation and adjustment

[0075] Hardware-based link switching is achieved by replacing the software-controlled channel shielding logic in Example 1 with a relay module.

[0076] Hardware integration:

[0077] A switching module is added inside the circuit breaker, such as adding an electromagnetic relay (e.g., a double-pole double-throw relay); the two ends of the normally closed contact of the relay are connected to the first communication connection module and the second communication connection module respectively, and the normally open contact is reserved. The first communication connection module is connected to the first communication channel and the inverter respectively, and the second communication module is connected to the second communication channel and the 4G acquisition stick respectively; the RS485 bus of the inverter, the 4G acquisition stick, and the circuit breaker is switched on and off through the relay contacts.

[0078] Communication control logic:

[0079] (1) Circuit breaker local reading process

[0080] When the circuit breaker needs to directly read the inverter, the internal control module triggers the relay to open the normally closed contact and temporarily close the normally open contact, physically cutting off the first communication connection module and the second communication connection module (4G acquisition stick and inverter RS485 link).

[0081] The first communication channel (circuit breaker and inverter link) remains connected, and the circuit breaker completes data reading through the Modbus-RTU protocol;

[0082] After the data transfer is completed, the relay resets, the normally closed contact is restored, and the RS485 link between the 4G data acquisition stick and the inverter is reactivated.

[0083] (2) Data Acquisition Rod Command Forwarding Process

[0084] After the RS485 link between the 4G acquisition stick and the inverter is activated, the RS485 command sent by the 4G acquisition stick is transmitted through the normally closed contact of the relay and the internal bus of the circuit breaker to the first communication connection module and then to the inverter.

[0085] The inverter response data is transmitted back along the original path. The relay only acts as a physical link switch and does not participate in protocol conversion, ensuring real-time communication.

[0086] The above examples provide three examples of multi-device communication links for microcircuit breakers connected to the photovoltaic grid. Example 1 uses RJ45+5P terminals to achieve intelligent switching and functional coordination, adapting to conventional scenarios; Example 2 replaces the CAN bus and adapts to the new ecosystem through protocol arbitration; Example 3 uses relays for mandatory control, simplifying logic adaptation costs.

[0087] This utility model embodiment also provides a circuit breaker. Figure 7 This is a bottom view diagram of the circuit breaker provided in this embodiment of the utility model. Figure 7 The first communication connection module 100 and the second communication connection module 200 are shown in the figure, with reference to Figure 7 The circuit breaker 10 includes the communication circuit of the circuit breaker in any of the above embodiments of the present invention, and has the beneficial effects of the communication circuit of the circuit breaker in any of the above embodiments of the present invention. The circuit breaker also includes a front-end electrical interface: including an incoming electrical interface and an outgoing electrical interface, which meets the basic power distribution function of the circuit breaker.

[0088] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A communication circuit for a circuit breaker, characterized in that, include: A first communication connection module (100) and a second communication connection module (200). The first communication connection module (100) includes a plurality of first pins (P1). The first communication connection module (100) connects to at least two communication channels (300) through at least some of the first pins (P1). The second communication connection module (200) includes a plurality of second pins (P2), and the second communication connection module (200) connects to at least one communication channel (300) through at least some of the second pins (P2).

2. The communication circuit of the circuit breaker according to claim 1, characterized in that, The plurality of first pins (P1) include a first channel connection pin (P11) and a second channel connection pin (P12). The first channel connection pin (P11) is connected to a first communication channel (301), and the second channel connection pin (P12) is connected to a second communication channel (302). The first communication channel (301) and the second communication channel (302) are isolated from each other.

3. The communication circuit of the circuit breaker according to claim 2, characterized in that, It also includes a switch module (400), which is connected to the first channel connection pin (P11) and the second channel connection pin (P12) respectively. The switch module (400) is used to control the connection state between the first channel connection pin (P11) and the second channel connection pin (P12).

4. The communication circuit of the circuit breaker according to any one of claims 1-3, characterized in that, The first communication connection module (100) includes an RJ45 interface or a terminal block.

5. The communication circuit of the circuit breaker according to any one of claims 1-3, characterized in that, The first communication connection module (100) includes a USB interface, and a signal conversion module is connected between the USB interface and the communication channel (300). The signal conversion module is used to realize signal conversion between the USB interface and the communication channel (300).

6. The communication circuit of the circuit breaker according to claim 1, characterized in that, The second communication connection module (200) includes a terminal block, the terminal block including a third channel connection pin (P21), the third channel connection pin (P21) being connected to a third communication channel (303).

7. The communication circuit of the circuit breaker according to claim 6, characterized in that, The terminal block also includes a metering pulse output pin, which is used to connect to the power metering module in the circuit breaker.

8. The communication circuit of the circuit breaker according to claim 1, characterized in that, The communication channel (300) includes a communication chip (310) and a digital isolator (320). The communication chip (310) includes a first connection end and a second connection end. The first connection end is connected to the first communication connection module (100) or the second communication connection module (200). The second connection end of the communication chip (310) is connected to the digital isolator (320).

9. The communication circuit of the circuit breaker according to claim 1, characterized in that, The communication channel (300) is an RS485 channel, a CAN channel, or an Ethernet channel.

10. A circuit breaker, characterized in that, The communication circuit of the circuit breaker as described in any one of claims 1-9.

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