Intelligent fireproof current-limiting protector

Abstract

The utility model relates to an intelligent fireproof current-limiting protector, which comprises a housing and a circuit part fixed in the housing, and is characterized in that the circuit part comprises a main circuit board, a main switch controller, a branch switch controller, a power supply module, a heat dissipation module, a main circuit board integrated logic controller, a live wire path and a null line path, the main switch controller and the branch switch controller are connected to the logic controller. The main switch controller comprises an electric leakage mutual inductor, a voltage mutual inductor, a current monitor, an MOS switch group, a first magnetic latching relay, a voltage surge buffer, a temperature sensor and a first zero line magnetic latching relay. The branch switch controller comprises a load magnetic latching relay and a current mutual inductor. When the voltage surge buffer deals with the turn-off of a high-power inductive load, voltage reduction and current limiting are realized for the voltage at the two ends of the MOS tube group, so that effective overshoot protection is realized for the MOS switch group, and the loop current after voltage reduction and current limiting is relatively small, so that arc discharge sparks are not easy to generate when the loop is turned off, and the use is relatively safe.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment and is an intelligent fire-proof current-limiting protector. Background Art

[0002] With the development of intelligent modernization, traditional circuit breakers and air switches are gradually being replaced by existing intelligent power distribution equipment, such as current limiting protectors. Current limiting protectors can effectively overcome the shortcomings of traditional circuit breakers, air switches and monitoring equipment, such as large short-circuit current, long short-circuit cut-off time, large arc sparks generated during short-circuit, and short service life. When a short-circuit fault occurs, the short-circuit current is quickly limited at a speed of microseconds to achieve current limiting protection, thereby reducing electrical accidents and ensuring the safety of personnel and property. Such current limiting protectors are published in Chinese patent documents with application publication number CN107947107A, application publication date April 20, 2018, and utility model name "a short-circuit protector circuit with current limiting function", which discloses that the use of MOS tube circuits can replace fuses to limit short-circuit current and cut off current. Another example is the authorization announcement number CN206323120U published in the Chinese patent literature, the authorization announcement date is July 11, 2017, and the utility model name is "A high-power fast electrical fire current limiting protector", which discloses the use of MOS tube switch elements in series in the live line, which are controlled by the drive circuit to close or open, and has the characteristics of fast breaking of short-circuit fault current, no electric sparks, and strong load capacity. The above two schemes both disclose that the use of MOS tubes can quickly cut off short-circuit current, thereby improving the reliability of short-circuit protection. However, when MOS tubes are actually used as switch components, there are often problems such as loss and heat generation. Although the prior art also discloses a solution for adding a cooling fan to the MOS tube, the upper limit of the cooling fan is relatively limited. Secondly, the existing MOS tube has a weak ability to resist voltage shocks, especially when used to shut down high-power inductive loads. Due to the load characteristics, it is easy to form a voltage shock on the MOS tube, causing damage to the MOS tube, losing the ability to break, and affecting the service life. In addition, the existing current limiting protector has poor ability to expand protection, resulting in its current limiting protection ability being relatively limited; when there are many load devices, it is still necessary to equip a conventional air switch for use, and the conventional air switch still has traditional defects, resulting in poor overall protection ability and losing the advantages of the intelligent current limiting protector. Therefore, the existing current limiting protector needs to be improved. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide an intelligent fire-proof current limiting protector to the art, so as to solve the technical problems of the existing similar current limiting protectors, such as the single function, poor protection reliability, and poor expansion protection capability. The purpose is achieved through the following technical solutions.

[0004] An intelligent fire-proof current-limiting protector, the protector comprises a cover and a circuit part fixed in the cover, the circuit part comprises a main circuit board, a main switch controller, a sub-switch controller, a power module, and a heat dissipation module, the main circuit board integrates a logic controller, a live line path, and a neutral line path, the main switch controller and the sub-switch controller are both connected to the logic controller, and the power module serves as the power supply for the logic controller, the main switch controller, the sub-switch controller, and the heat dissipation module; the structural key points are that the main switch controller comprises a leakage transformer, a voltage transformer, a current monitor, a MOS switch group, a first magnetic latching relay, a voltage impact buffer, a temperature sensor, and a first neutral line magnetic latching relay, the sub-switch controller comprises a load magnetic latching relay, and a current transformer, the neutral line path is connected to the leakage transformer for leakage monitoring and the first neutral line magnetic latching relay for disconnection control, the live line path is connected to the voltage transformer for voltage monitoring and the current monitor for current monitoring, and the MO The S switch group and the first magnetic latching relay are connected in series to the live wire path as two switches. The voltage impact buffer is connected in parallel to the live wire path relative to the MOS switch group. The voltage impact buffer turns on the live wire path and reduces the voltage and limits the current when the voltage at both ends of the MOS switch group is greater than the set value. The temperature sensor corresponds to monitoring the temperature of the MOS tube of the MOS switch group. The end of the live wire path branches to form a row of branches, each branch is provided with the load magnetic latching relay for controlling the disconnection and the current transformer for monitoring the branch current, and each branch end is provided with a load interface for connecting an external load device; the main switch controller and the branch switch controller are connected to the logic controller. When the values ​​sensed by the leakage transformer, the voltage transformer, the current monitor, the temperature sensor, and the current transformer are greater than the threshold set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first neutral line magnetic latching relay, and the load magnetic latching relay to disconnect.

[0005] Through the above structure, effective protection against leakage, voltage and current overload, and short circuit is achieved, and the microsecond shutdown characteristics of the MOS switch group are utilized, so that the protection is relatively reliable. At the same time, by adding a voltage impact buffer, when dealing with the shutdown of a high-power inductive load, the voltage at both ends of the MOS tube group is reduced and limited by the voltage impact buffer, thereby providing effective overshoot protection for the MOS switch group, which is not easy to be damaged, is relatively safe and reliable to use, has a long service life, and is more applicable to load characteristics. In addition, the loop current after the voltage impact buffer is reduced and limited is small, so it is not easy to generate arc sparks when the first magnetic latching relay is disconnected, which is relatively safe.

[0006] The heat dissipation module is a heat dissipation fan that directly blows heat to the heat sink of the MOS switch group, and the heat dissipation fan forms a control loop with the logic controller and the temperature sensor. Through this structure, effective heat dissipation of the MOS switch group is achieved, ensuring the safe use of the MOS tube and extending its service life.

[0007] The side of the housing is provided with a convection heat dissipation hole, a buffer air cavity is provided between the end surface of the heat dissipation fan and the heat dissipation hole, and the windward area of ​​the buffer air cavity is larger than the ventilation area of ​​the heat dissipation fan. This structure effectively solves the problem of the existing heat dissipation fan having ventilation obstruction and high noise due to the close fit between the air inlet surface and the heat dissipation hole, that is, by providing the buffer air cavity, air convection is facilitated, heat dissipation efficiency is improved, and noise is reduced at the same time.

[0008] The main switch controller comprises a second magnetic latching relay, which is connected in parallel with the live wire path relative to the MOS switch group and the voltage surge buffer as a switch.

[0009] The second magnetic latching relay is disconnected in the initial state, and when the temperature sensed by the temperature sensor approaches the threshold value set by the temperature sensor corresponding to the logic controller, the second magnetic latching relay conducts the live wire path. This structure is conducive to realizing the shunting operation of the MOS switch group, thereby reducing the temperature of the MOS tube group and improving the reliability and life of the MOS tube group.

[0010] The circuit part includes an interactive module and a communication module connected to the logic controller. The interactive module integrates operation buttons, a display screen, an indicator light, and a buzzer, and the communication module integrates a network communication module and a carrier communication module. This structure facilitates the human-computer interaction and remote connection of the protector.

[0011] The protector is divided into a main protector and a sub-protector, and the main circuit board is divided into a main switch circuit board and a sub-switch circuit board, that is, part of the live wire path of the main circuit board is integrated in the main switch circuit board, and the rest of the live wire path is integrated in the sub-switch circuit board. The main switch circuit board, the main switch controller, the power module, and the heat dissipation module are all located in the main protector, and the sub-switch circuit board and the sub-switch controller are all located in the sub-protector; the main switch circuit board is integrated with a conductive communication socket, and the sub-switch circuit board is integrated with a conductive communication plug and a conductive communication socket. The main protector and the sub-protector form a conductive communication connection through the conductive communication socket and the conductive communication plug, and the sub-protectors form an extended conductive communication connection through the conductive communication socket and the conductive communication plug. Through this structure, the protector is split into two combined parts, so that different numbers of sub-protectors can be extended and connected according to load needs, which is convenient for extended use and has a wide range of applications.

[0012] The main switch circuit board of the main circuit board is integrated with a main power live wire interface and a live wire output interface connected to the live wire path, and a main power zero wire interface and a zero wire output interface connected to the zero wire path. The sub-switch circuit board is integrated with a live wire input interface and a row of load interfaces connected to the live wire path, and the sub-switch circuit board is integrated with a zero wire loop, and zero wire interfaces are provided at both ends of the zero wire loop, and the zero wire loop is provided with a second zero wire magnetic latching relay for controlling the disconnection. The above is the interface structure of the main protector and the sub-protector, which is convenient for external use.

[0013] The live wire path of the main circuit board is entirely or partially a conductive busbar, and the conductive busbar is detachably fixed to the main circuit board by screws. This structure can effectively improve the current carrying capacity and is also convenient for maintenance and replacement.

[0014] The load magnetic latching relay is provided with a manual switch. Through this structure, it is convenient to manually control the opening and closing of the load device.

[0015] The utility model has the functions of leakage protection, voltage and current overload, short circuit and overheating protection, and effectively protects the MOS tube group from overshoot and overheating. It is safe to use and has a long service life. It is suitable for use as a fire-proof current-limiting protector for various load equipment, especially large current and multi-load power circuits, or an improvement on the structure of similar protectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the explosion structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0018] Figure 3 It is a front structural schematic diagram of the main circuit board of the utility model.

[0019] Figure 4 yes Figure 3 Schematic diagram of the back structure.

[0020] Figure 5 It is a schematic diagram of the structure of the main protector of the utility model.

[0021] Figure 6 It is a schematic diagram of the structure of the sub-protector of the utility model.

[0022] Figure 7 yes Figure 5 The main protector and Figure 6 Schematic diagram of the structure for docking use of sub-protectors.

[0023] Figure 8 yes Figure 7 Schematic diagram of the structure of the extended connection branch switch protector.

[0024] Fig. 9 yes Figure 2 Schematic diagram of the wiring status structure.

[0025] Fig.10 yes Figure 7 Schematic diagram of the wiring status structure.

[0026] Fig.11 It is a control principle structure block diagram of the utility model.

[0027] The serial numbers and names of the figures are: 1. cover, 101. heat dissipation air holes, 102. buffer air cavity, 2. interactive module, 3. communication module, 4. power module, 5. cooling fan, 6. main circuit board, 601. AC live wire interface, 602. AC neutral wire interface, 603. neutral wire output interface, 7. leakage transformer, 8. first neutral wire magnetic latching relay, 9. MOS switch group, 10. first magnetic latching relay, 11. second magnetic latching relay, 13. load magnetic latching relay, 14. current transformer, 15. load interface, 16. current monitor, 17. voltage surge buffer, 18. conductive busbar, 19. main protector, 20. sub-protector. Implementation

[0028] The utility model is now further described with reference to the accompanying drawings.

[0029] like Figure 1-Figure 4 , Fig. 9 , Fig.11As shown, the intelligent fire-proof current limiting protector includes a cover 1 and a circuit part fixed in the cover, the circuit part includes an interactive module 2, a communication module 3, a main circuit board 6, a main switch controller, a sub-switch controller, a power module 4, and a heat dissipation module. The interactive module integrates operation buttons, a display screen, an indicator light, and a buzzer. The communication module integrates a network communication module and a carrier communication module. The main circuit board integrates a logic controller, a live wire path, and a neutral wire path. The interactive module, the communication module, the main switch controller, and the sub-switch controller are all connected to the logic controller. The power module is connected to the live wire path and the neutral wire path of the main circuit board and is used as power supply for the interactive module, the communication module, the logic controller, the main switch controller, the sub-switch controller, and the heat dissipation module after step-down rectification. The interactive module realizes manual input of the logic controller and information output of the display screen, the indicator light, and the buzzer. The network communication module realizes remote control connection with an external server or terminal device through a WIFI network, a 4G network, and a carrier network. The main switch controller includes a leakage transformer 7, a voltage transformer, a current monitor 16, a MOS switch group 9, a first magnetic latching relay 10, a voltage impact buffer 17, a temperature sensor, and a first neutral line magnetic latching relay 8. The sub-switch controller includes a load magnetic latching relay 13 and a current transformer 14. The neutral line path of the main circuit board is connected to the above-mentioned leakage transformer for detecting leakage current and the above-mentioned neutral line magnetic latching relay for controlling disconnection. The two ends of the neutral line path are respectively the mains neutral line interface 602 and the neutral line output interface 603. One end of the live wire path is a mains live wire interface 601, the live wire path is connected to the voltage transformer for monitoring voltage and the current monitor for monitoring current, the MOS switch group and the first magnetic latching relay are connected in series to the live wire path as two switches, the voltage surge buffer is connected in parallel to the live wire path relative to the MOS switch group, the voltage surge buffer is for conducting the live wire path and reducing voltage and limiting current when the voltage across the MOS switch group is greater than a set value, the temperature sensor corresponds to the temperature of the MOS tube of the MOS switch group, the end of the live wire path branches to form a row of branches, each branch is provided with a load magnetic latching relay with a manual switch for controlling disconnection and a current transformer for monitoring branch current, and each branch end is provided with a load interface 15 for connecting an external load device. The above-mentioned main switch controller and sub-switch controller are connected to the logic controller and are set as follows: when the values ​​sensed by the leakage transformer, voltage transformer, current monitor, temperature sensor, and current transformer are greater than the threshold value set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first neutral line magnetic latching relay, and the load magnetic latching relay to disconnect, cut off the circuit, and achieve current limiting protection.

[0030] The heat dissipation module is a heat dissipation fan 5 that directly blows heat away from the heat sink of the MOS switch group 9, and the heat dissipation fan forms a control loop with the logic controller and the temperature sensor. When the temperature sensor senses that the temperature of the MOS switch group is greater than the set value, the heat dissipation fan is turned on to achieve a cooling operation on the MOS switch group.

[0031] In order to further realize the temperature control protection of the MOS switch group 9, the main switch controller includes a second magnetic latching relay 11, which is connected in parallel to the live wire path as a switch relative to the MOS switch group and the voltage impact buffer 17. The second magnetic latching relay is disconnected in the initial state. When the temperature sensed by the temperature sensor is close to the threshold set by the logic controller corresponding to the temperature sensor, the second magnetic latching relay conducts the live wire path to realize the current shunting of the MOS switch group, thereby effectively reducing the temperature of the MOS tube group and improving the reliability and life of the MOS tube group.

[0032] like Figure 5-Figure 8 , Fig.10As shown, the intelligent fire-proof current-limiting protector can also be divided into a combined main protector 19 and a sub-protector 20. The main circuit board 6 is divided into a main switch circuit board and a sub-switch circuit board, that is, part of the live wire path of the main circuit board is integrated in the main switch circuit board, and the remaining live wire path is integrated in the sub-switch circuit board. The interactive module 2, the communication module 3, the main switch circuit board, the main switch controller, the power module 4, and the heat dissipation module are all located in the main protector, and the sub-switch circuit board and the sub-switch controller are all located in the sub-protector. The main switch circuit board is integrated with a conductive communication socket, and the sub-switch circuit board is integrated with a conductive communication plug and a conductive communication socket. The main protector and the sub-protector form a conductive communication connection through the conductive communication socket and the conductive communication plug, that is, a control connection is formed between the sub-protector sub-switch controller and the logic controller. The sub-protectors form an extended conductive communication connection through the conductive communication socket and the conductive communication plug, that is, the number of load interfaces is expanded. The main switch circuit board of the above main circuit board is integrated with a mains live interface 601 for accessing the live path, a live output interface, a mains zero line interface 602 for accessing the zero line path, and a zero line output interface 603, the sub-switch circuit board is integrated with a live input interface for accessing the live path and a row of load interfaces 15 for connecting external load devices, and the sub-switch circuit board is integrated with a zero line loop, zero line interfaces are provided at both ends of the zero line loop, and the zero line loop is provided with a second zero line magnetic latching relay for controlling the disconnection. When in use, the conductive communication plug is connected to the conductive communication socket, and then the mains live interface and the mains zero line interface of the main protector are connected to the main power, the live input interface of the sub-protector is connected to the live output interface of the main protector through a wire, one of the zero line interfaces of the sub-protector is connected to the zero line output interface of the main protector, the load interface is externally connected to the load device, and the zero line loop of the load device is connected to another zero line interface of the sub-protector, and the above forms a complete control loop.

[0033] like Figure 2 As shown, in order to reduce the fan noise when the protector is working and improve the heat dissipation effect, a convection heat dissipation hole 101 is provided on the side of the cover 1 of the protector, and a buffer air cavity 102 is provided between the end face of the heat dissipation fan 5 and the heat dissipation hole, and the windward area of ​​the buffer air cavity is larger than the ventilation area of ​​the heat dissipation fan, thereby improving air convection, improving heat dissipation efficiency, and reducing noise.

[0034] like Figure 4 As shown, the live wire path of the protector main circuit board 6 is entirely or partially made of a copper conductive busbar 18, and the conductive busbar is detachably fixed to the main circuit board by screws, thereby improving the current carrying capacity, preventing overheating and burning, and facilitating maintenance and replacement.

[0035] Furthermore, combined with Fig. 9The working method of the protector is described as follows: when the protector is used, the mains live line interface 601 and the mains neutral line interface 602 of the protector are connected to the external mains, the load interface 15 is connected to the external load device, and the neutral line of the load device is connected to the neutral line output interface 603 of the protector. In the initial state, the MOS switch group 9, the first magnetic latching relay 10, the second magnetic latching relay 11, the first neutral line magnetic latching relay 8, and the load magnetic latching relay 13 are all in the disconnected state. The manual operation interaction module 2 or the communication module 3 receives the instruction of the external remote device, and the logic controller controls the above-mentioned first magnetic latching relay, the neutral line magnetic latching relay, and the load magnetic latching relay to be turned on first, and then controls the MOS switch group to be turned on. Due to the arc-free characteristics of the MOS tube group, there is no arc spark when the live line path of the main circuit board 6 is turned on. When the logic controller receives a shutdown signal, or the values ​​sensed by the leakage transformer 7, voltage transformer, current monitor 16, current transformer 14, and temperature sensor are greater than the threshold value set in the logic controller, the logic controller controls the MOS switch group to disconnect first, and then controls the first magnetic latching relay, the first neutral line magnetic latching relay, and the load magnetic latching relay to disconnect. During the shutdown process, if the load device is a high-power inductive load, when the MOS tube group is turned off, the total power of the load device remains unchanged, and the current suddenly decreases, which will cause the live wire path to form a sudden increase in impact voltage. If the impact voltage is greater than the excitation value of the voltage impact buffer 17, the voltage impact buffer limits the voltage and reduces the voltage at both ends of the MOS tube group. At the same time, the voltage impact buffer circuit conducts the live wire path to form a small current, which is not enough to cause the first magnetic latching relay, the first neutral line magnetic latching relay, and the load magnetic latching relay to form an arc phenomenon when they are disconnected, thereby achieving arc-free disconnection of the circuit and protecting the MOS switch group at the same time. When the temperature of the MOS switch group rises during operation, the temperature sensor senses the temperature of the MOS switch group, and the logic controller controls the cooling fan 5 to start working, thereby realizing the cooling protection of the MOS switch group. If the temperature of the MOS switch group is still close to the threshold value set by the logic controller corresponding to the temperature sensor under the heat dissipation effect of the cooling fan, the logic controller controls the second magnetic latching relay 11 to conduct the live wire path, thereby realizing the current shunting operation of the MOS switch group, thereby realizing the cooling protection of the MOS switch group. In addition to the above, according to the actual current limiting protection requirements, the condition setting of the logic controller can be realized through the interactive module or the communication module, so as to realize various combined protection functions and meet the protection requirements of various types of electrical equipment.

[0036] The above contents are intended to illustrate the technical means of the present invention, but not to limit the technical scope of the present invention. Those skilled in the art can make obvious improvements or substitutions to the present invention in combination with existing common knowledge, which also fall within the protection scope of the claims of the present invention.

Claims

1. An intelligent fire-proof current-limiting protector, the protector comprising a housing (1) and a circuit part fixed in the housing, the circuit part comprising a main circuit board (6), a main switch controller, a sub-switch controller, a power module (4), and a heat dissipation module, the main circuit board integrating a logic controller, a live line path, and a neutral line path, the main switch controller and the sub-switch controller are both connected to the logic controller, and the power module serves as a power supply for the logic controller, the main switch controller, the sub-switch controller, and the heat dissipation module; characterized in that The main switch controller comprises a leakage transformer (7), a voltage transformer, a current monitor (16), a MOS switch group (9), a first magnetic latching relay (10), a voltage impact buffer (17), a temperature sensor, and a first neutral line magnetic latching relay (8); the branch switch controller comprises a load magnetic latching relay (13) and a current transformer (14); the neutral line path is connected to the leakage transformer for leakage monitoring and the first neutral line magnetic latching relay for disconnection control; the live line path is connected to the voltage transformer for voltage monitoring and the current monitor for current monitoring; the MOS switch group and the first magnetic latching relay are connected in series to the live line path as two switches; the voltage impact buffer is connected in parallel to the MOS switch group to the live line path; the voltage The impact buffer is used to conduct the live wire path and reduce the voltage and limit the current when the voltage at both ends of the MOS switch group is greater than the set value. The temperature sensor corresponds to monitoring the temperature of the MOS tube of the MOS switch group. The end of the live wire path branches to form a row of branches. Each branch is provided with the load magnetic latching relay for controlling the disconnection and the current transformer for monitoring the branch current. The end of each branch is provided with a load interface (15) for connecting an external load device; the main switch controller and the branch switch controller are connected to the logic controller. When the values ​​sensed by the leakage transformer, the voltage transformer, the current monitor, the temperature sensor, and the current transformer are greater than the threshold set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first neutral line magnetic latching relay, and the load magnetic latching relay to disconnect.

2. The intelligent fire protection and current limiting protector according to claim 1 is characterized in that The heat dissipation module is a heat dissipation fan (5) that directly blows heat away from the heat sink of the MOS switch group (9), and the heat dissipation fan forms a control loop with the logic controller and the temperature sensor.

3. The intelligent fire protection and current limiting protector according to claim 2 is characterized in that The side of the housing (1) is provided with a convection heat dissipation air hole (101), a buffer air cavity (102) is provided between the end surface of the heat dissipation fan (5) and the heat dissipation air hole, and the windward area of ​​the buffer air cavity is larger than the ventilation area of ​​the heat dissipation fan.

4. The intelligent fire-proof current limiting protector according to claim 2 is characterized in that The main switch controller comprises a second magnetic latching relay (11), which is connected in parallel with the MOS switch group (9) and the voltage impact buffer (17) and is connected to the live wire path as a switch.

5. The intelligent fire-proof current limiting protector according to claim 4 is characterized in that The second magnetic latching relay (11) is disconnected in an initial state. When the temperature sensed by the temperature sensor approaches a threshold value set by the logic controller corresponding to the temperature sensor, the second magnetic latching relay switches on the live wire path.

6. The intelligent fire-proof current-limiting protector according to claim 1 is characterized in that The circuit part comprises an interaction module (2) and a communication module (3) connected to the logic controller, the interaction module integrating operation buttons, a display screen, an indicator light, and a buzzer, and the communication module integrating a network communication module and a carrier communication module.

7. The intelligent fire-proof current-limiting protector according to claim 1 is characterized in that The protector is divided into a main protector (19) and a sub-protector (20), and the main circuit board (6) is divided into a main switch circuit board and a sub-switch circuit board, that is, part of the live wire path of the main circuit board is integrated in the main switch circuit board, and the rest of the live wire path is integrated in the sub-switch circuit board. The main switch circuit board, the main switch controller, the power module (4), and the heat dissipation module are all located in the main protector, and the sub-switch circuit board and the sub-switch controller are all located in the sub-protector; the main switch circuit board is integrated with a conductive communication socket, and the sub-switch circuit board is integrated with a conductive communication plug and a conductive communication socket. The main protector and the sub-protector form a conductive communication connection by docking the conductive communication socket and the conductive communication plug, and the sub-protectors form an extended conductive communication connection by docking the conductive communication socket and the conductive communication plug.

8. The intelligent fire-proof current-limiting protector according to claim 7 is characterized in that The main switch circuit board of the main circuit board (6) is integrated with a mains live wire interface (601) connected to the live wire path, a live wire output interface, and a mains neutral wire interface (602) connected to the neutral wire path, and a neutral wire output interface (603); the sub-switch circuit board is integrated with a live wire input interface connected to the live wire path and a row of load interfaces (15); the sub-switch circuit board is integrated with a neutral wire loop, both ends of the neutral wire loop are provided with neutral wire interfaces, and the neutral wire loop is provided with a second neutral wire magnetic latching relay for controlling disconnection.

9. The intelligent fire-proof current-limiting protector according to claim 1 is characterized in that The live wire path of the main circuit board (6) is entirely or partially a conductive busbar (18), and the conductive busbar is detachably fixed to the main circuit board by screws.

10. The intelligent fire protection and current limiting protector according to claim 1 is characterized in that The load magnetic latching relay (13) is provided with a manual switch.

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