Circuit protection device and electrical apparatus

Abstract

The application provides a circuit protection device and an electrical equipment, and relates to the technical field of circuit protection. The circuit protection device comprises a passive driving module, an excitation module and a cut-off module. The passive driving module is used for cutting off the excitation module when a fault electric signal of a main circuit is detected, so that the excitation module generates high voltage. The excitation module is used for driving the cut-off module to disconnect the main circuit after the high voltage is generated. In the scheme, the passive driving module is used for self-detecting the fault current in the main circuit, and the excitation module can be driven without an external trigger signal. The problem that the fault current cannot be cut off in time when the external trigger signal circuit fails or the excitation source fails in the related art is solved. Meanwhile, the passive driving module cuts off the excitation module when the fault electric signal of the main circuit is detected, so that the excitation module generates high voltage, and the cut-off module is driven to cut off the main circuit through the high voltage generated by the excitation module, thereby protecting the main circuit.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically, to circuit protection devices and electrical equipment. Background Technology

[0002] A momentary circuit breaker (MTB) works by detonating explosives to generate a high-pressure surge, which in turn triggers a mechanical device to disconnect the circuit. Typically, an MTB consists of several modules: an excitation module and a disconnection module. The excitation module, upon receiving an excitation signal, detonates to generate a high-pressure surge. The disconnection module, using the thrust generated by the high-pressure surge, drives a piston or switch to disconnect the main circuit's conductive components, thus breaking the circuit and protecting the main circuit.

[0003] In related technologies, most circuit protection devices trigger an excitation source via an external trigger signal, mechanically disconnecting the circuit. Specifically, after receiving a fault signal detected by the external trigger signal circuit, the excitation module triggers an explosion within its chamber to generate high voltage. The impact force generated by this high voltage drives the disconnection module to cut off the main circuit copper busbar, thus achieving the purpose of protecting the main circuit.

[0004] However, this type of circuit protection device has certain drawbacks. When the external trigger signal circuit malfunctions or the excitation source fails, the current cannot be cut off in time, which may lead to a very serious safety accident. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a circuit protection device and electrical equipment, thereby solving the technical problems existing in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a circuit protection device, which includes: a passive drive module, an excitation module, and a cut-off module, wherein the excitation module and the cut-off module are both disposed within a sealed housing;

[0008] The first end of the passive drive module is connected to the input end of the main circuit in the circuit to be protected, the second end of the passive drive module is connected to the output end of the main circuit, and the third end of the passive drive module is connected to one end of the excitation module.

[0009] The passive drive module is used to cut off the excitation module when a fault electrical signal is detected in the main circuit, so that the excitation module generates high voltage.

[0010] The excitation module is used to drive the disconnection module to disconnect the main circuit after generating high voltage.

[0011] Optionally, the passive drive module includes: a passive magnetic drive unit, an unlocking module, and an energy storage elastic element;

[0012] One end of the passive magnetic drive unit is connected to the input end of the main circuit, and the other end of the passive magnetic drive unit is connected to the output end of the main circuit and one end of the unlocking module, respectively.

[0013] The other end of the unlocking module is connected to one end of the energy storage elastic element, and the other end of the energy storage elastic element is connected to the input end of the excitation module.

[0014] The passive magnetic drive unit is used to convert the fault electrical signal into a magnetic signal when the main circuit generates a fault electrical signal, and drive the unlocking module to unlock through the magnetic signal;

[0015] The unlocking module is used to drive the energy storage elastic element to move and generate elastic potential energy after unlocking.

[0016] The energy storage elastic element is used to drive the excitation module to generate high voltage through the elastic potential energy.

[0017] Optionally, the excitation module includes: a first excitation source and a second excitation source;

[0018] The first excitation source is disposed in the first cavity inside the sealed housing, and the second excitation source is disposed in the second cavity inside the sealed housing;

[0019] A first through hole is provided at the connection surface between the first cavity and the second cavity;

[0020] The first excitation source includes: a disconnection module, wherein, under normal operating conditions, the switching device in the disconnection module is normally closed;

[0021] The first excitation source is used to drive the switching device in the disconnection module to switch from a normally closed state to a cut-off state under the action of the elastic potential energy, and generate an electric arc signal, and transmit the electric arc signal to the second cavity through the first through hole;

[0022] The second excitation source is used to ignite the explosive in the second cavity under the action of the arc signal, generate high pressure, and drive the cut-off module to disconnect the main circuit under the action of high pressure.

[0023] Optionally, the passive magnetic drive unit includes: an iron core and a magnetic drive coil, wherein the iron core is annular and the magnetic drive coil is wound on the iron core;

[0024] The magnetic drive coil is used to convert the fault electrical signal into a magnetic signal when the main circuit generates a fault electrical signal.

[0025] The iron core is used to move under the action of the magnetic signal to drive the unlocking module to unlock.

[0026] Optionally, the magnetic drive coil has n turns and a magnetically adjustable range of 1-2In, where n is an integer greater than or equal to 1.

[0027] Optionally, the circuit protection device further includes: an arc extinguishing module;

[0028] The arc-extinguishing module is located at the bottom end of the second cavity;

[0029] The arc-extinguishing module is used to transfer and absorb the electric arc generated when the main circuit is cut off.

[0030] Optionally, the arc extinguishing module includes: an arc extinguishing grid or an arc extinguishing fuse.

[0031] Optionally, the second cavity is also provided with an external excitation source interface;

[0032] The external excitation source interface is used to receive input external excitation signals;

[0033] The second excitation source is also used to ignite the explosive in the second cavity to generate high pressure under the action of the external excitation signal, and drive the cut-off module to disconnect the main circuit under the action of high pressure.

[0034] Optionally, the cutting module includes at least one break point.

[0035] Secondly, embodiments of this application also provide an electrical device, including the circuit protection device described in the first aspect.

[0036] The beneficial effects of this application are:

[0037] This application provides a circuit protection device and an electrical appliance. The circuit protection device includes a passive drive module, an excitation module, and a disconnection module. The excitation module and the disconnection module are both housed within a sealed housing. The first end of the passive drive module is connected to the input end of the main circuit in the circuit to be protected, the second end of the passive drive module is connected to the output end of the main circuit, and the third end of the passive drive module is connected to one end of the excitation module. The passive drive module is used to disconnect the excitation module when a fault electrical signal is detected in the main circuit, so that the excitation module generates a high voltage. The excitation module is used to drive the disconnection module to disconnect the main circuit after generating the high voltage. In this solution, a passive drive module autonomously detects fault current in the main circuit. It can drive the excitation module without receiving external trigger signals, and the entire process is safe, reliable, and highly stable. This solves the problem in related technologies where failure of the external trigger signal circuit or excitation source leads to the inability to cut off the current in time. Simultaneously, when the passive drive module detects a fault signal in the main circuit, it disconnects the excitation module, causing the excitation module to generate high voltage. This high voltage drives the disconnect module to cut off the main circuit, thus interrupting the fault current and providing overcurrent protection for the main circuit, improving the safety of the electrical equipment. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a circuit protection device provided in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of another circuit protection device provided in an embodiment of this application;

[0041] Figure 3 A schematic diagram of the structure of another circuit protection device provided in the embodiments of this application;

[0042] Figure 4 This is a schematic diagram of another circuit protection device provided in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application.

[0044] Icons: 100-Circuit protection device; 1-Passive drive module; 2-Excitation module; 3-Severing module; 11-Passive magnetic drive unit; 12-Unlocking module; 13-Energy storage elastic element; 21-First excitation source; 22-Second excitation source; 4-Arc extinguishing module; 200-Electrical equipment. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0046] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0048] Figure 1 This is a schematic diagram of the structure of a circuit protection device 100 provided in an embodiment of this application; as shown... Figure 1 As shown, the circuit protection device 100 includes: a passive drive module 1, an excitation module 2, and a cut-off module 3, wherein the excitation module 2 and the cut-off module 3 are both housed in a sealed housing.

[0049] For example, the passive drive module 1 can be a passive magnetic drive module, which achieves drive through the magnetic field generated by the magnetic material in the passive magnetic drive module. That is, it can drive the excitation module 2 without external power supply or drive circuit.

[0050] Continue to refer to Figure 1As shown, the first terminal of the passive drive module 1 is connected to the input terminal of the main circuit in the circuit to be protected, the second terminal of the passive drive module 1 is connected to the output terminal of the main circuit, and the third terminal of the passive drive module 1 is connected to one end of the excitation module 2. For example, the main circuit can be a main branch in the electrical equipment, on which multiple power devices are installed. The passive drive module 1 can be connected in series to the input terminal of this main branch, and the third terminal of the passive drive module 1 is also connected to one end of the excitation module 2, meaning that the excitation module 2 can receive the excitation signal input from the passive drive module 1.

[0051] The passive drive module 1 is used to cut off the excitation module 2 when a fault electrical signal is detected in the main circuit, so that the excitation module 2 can generate high voltage.

[0052] Excitation module 2 is used to drive the cut-off module to disconnect the main circuit after high voltage is generated.

[0053] In this embodiment, when the passive drive module detects a fault electrical signal in the main circuit, i.e., the operating current is too high, the passive drive module drives the switching device in the excitation module to perform a disconnection action, so that the excitation module generates high voltage. Through the high voltage generated by the excitation module, the disconnection module is driven to disconnect the main circuit, i.e., cut off the fault current, avoiding the possibility of the power devices in the main circuit being burned out. This achieves fault protection of the main circuit and improves the safety of the electrical equipment.

[0054] In summary, this application provides a circuit protection device comprising: a passive drive module, an excitation module, and a cut-off module, wherein the excitation module and the cut-off module are both housed within a sealed housing; the first end of the passive drive module is connected to the input end of the main circuit in the circuit to be protected, the second end of the passive drive module is connected to the output end of the main circuit, and the third end of the passive drive module is connected to one end of the excitation module; the passive drive module is used to cut off the excitation module when a fault electrical signal is detected in the main circuit, so that the excitation module generates high voltage; the excitation module is used to drive the cut-off module to disconnect the main circuit after generating high voltage. In this solution, a passive drive module autonomously detects fault current in the main circuit. It can drive the excitation module without receiving external trigger signals, and the entire process is safe, reliable, and highly stable. This solves the problem in related technologies where failure of the external trigger signal circuit or excitation source leads to the inability to cut off the current in time. Simultaneously, when the passive drive module detects a fault signal in the main circuit, it disconnects the excitation module, causing the excitation module to generate high voltage. This high voltage drives the disconnect module to cut off the main circuit, thus interrupting the fault current and providing overcurrent protection for the main circuit, improving the safety of the electrical equipment.

[0055] Optionally, refer to Figure 2As shown, the passive drive module 1 includes: a passive magnetic drive unit 11, an unlocking module 12, and an energy storage elastic element 13. Exemplarily, the unlocking module 12 can be a snap-fit ​​element, and the energy storage elastic element 13 can be a spring or other forms, which are not specifically limited here.

[0056] One end of the passive magnetic drive unit 11 is connected to the input end of the main circuit, and the other end of the passive magnetic drive unit 11 is connected to the output end of the main circuit and one end of the unlocking module 12, respectively.

[0057] The other end of the unlocking module 12 is connected to one end of the energy storage elastic element 13, and the other end of the energy storage elastic element 13 is connected to the input end of the excitation module 2.

[0058] The passive magnetic drive unit 11 is used to convert the fault electrical signal into a magnetic signal when a fault electrical signal is detected in the main circuit, and to drive the unlocking module 12 to unlock it through the magnetic signal.

[0059] The unlocking module is used to drive the energy storage elastic element 13 to move and generate elastic potential energy after unlocking.

[0060] The energy storage elastic element 13 is used to drive the excitation module 2 to generate high voltage through elastic potential energy.

[0061] In this embodiment, during the operation of the electrical equipment, the passive magnetic drive unit 11 continuously monitors whether the operating current I of the main circuit in the electrical equipment is abnormal. For example, if the operating current I1 is greater than the current threshold I at a certain moment... th If the fault current I1 is determined to be the working current, the passive magnetic drive unit 11 converts the fault current into a magnetic signal and drives the unlocking module 12 to unlock, such as by disengaging the latch in the unlocking module 12 from the latching component. After the unlocking module 12 is unlocked, it drives the energy storage elastic element 13 to move and generate elastic potential energy, that is, releases the stored energy. The elastic potential energy generated by the energy storage elastic element 13 drives the excitation module 2 to generate high voltage. That is, the excitation module 2 receives the internal trigger signal generated by the passive magnetic drive unit 11, the unlocking module 12 and the energy storage elastic element 13 together. The excitation module 2 can be triggered without the need for an external trigger signal, and the entire mechanical transmission structure is stable and reliable.

[0062] Optionally, continue to refer to Figure 2 As shown, the excitation module 2 includes: a first excitation source 21 and a second excitation source 22;

[0063] The first excitation source 21 is disposed in the first cavity within the sealed housing, and the second excitation source 22 is disposed in the second cavity within the sealed housing; the structure of the sealed housing is not specifically limited. The first cavity contains a disconnection module, and the second cavity is filled with flammable pyrotechnics.

[0064] A first through hole is provided at the connection surface between the first cavity and the second cavity. The size and shape of the first through hole are not specifically limited.

[0065] The first excitation source 21 includes a disconnect module, wherein, under normal operating conditions, the switching device in the disconnect module is normally closed.

[0066] The first excitation source 21 is used to drive the switching device in the disconnect module to switch from the normally closed state to the disconnected state under the action of elastic potential energy, and generate an electric arc signal, and transmit the electric arc signal to the second cavity through the first through hole.

[0067] The second excitation source 22 is used to ignite the explosive in the second cavity (i.e., the explosion cavity) under the action of the electric arc signal, and generate high pressure, and drive the cut-off module 3 to disconnect the main circuit under the action of high pressure.

[0068] The first excitation source 21 is an excitation module 2 equipped with a mechanical structure, and the second excitation source is an excitation module 2 equipped with pyrotechnic components.

[0069] In this embodiment, the first excitation source 21, under the action of the elastic potential energy generated by the energy storage elastic element 13, drives the switching device in the disconnect module to switch to the disconnect state. At the moment the switching device is disconnected, an electric arc signal is generated and transmitted to the second cavity through the first through hole. Under the action of the electric arc signal, the second excitation source ignites the explosive in the second cavity, and after the explosive is ignited, high-pressure gas is generated. Under the action of the high-pressure gas, the disconnect module 3 is driven to move downward to disconnect the main circuit copper busbar, thereby realizing the disconnection operation of the disconnect module 3 and protecting the safety of the entire system.

[0070] Optionally, the passive magnetic drive unit 11 includes: an iron core and a magnetic drive coil, wherein the iron core is in the shape of a ring and the magnetic drive coil is wound on the iron core;

[0071] The magnetic drive coil is used to convert a fault electrical signal into a magnetic signal when a fault electrical signal is detected in the main circuit.

[0072] The iron core is used to move under the action of magnetic signals to drive the unlocking module 12 to unlock.

[0073] In one feasible approach, when the magnetic drive coil detects a fault current in the main circuit, it converts the fault current into a magnetic signal. Under the action of the magnetic signal, the iron core drives the connecting rod to perform a counterclockwise movement, thereby driving the latch in the unlocking module 12 to separate from the latching component. In other words, the unlocking module 12 is driven to perform the unlocking operation through the mechanical action of the iron core.

[0074] Optionally, the magnetic drive coil has n turns and a magnetically adjustable range of 1-2In.

[0075] In one feasible implementation, the number of turns of the magnetic drive coil in the passive magnetic drive unit 11 can be n, where n is an integer greater than or equal to 1, such as n = 3. Therefore, the number of turns of the magnetic drive coil can be set according to the actual situation, and no specific limitation is made here.

[0076] Meanwhile, in order to ensure that the generated magnetic signal is sufficient to drive the unlocking module 12 to unlock, the adjustable range of the magnetic drive coil can be set to 1-2In to ensure the stability and reliability of the entire mechanical transmission process.

[0077] Optionally, refer to Figure 3 As shown, the circuit protection device 100 also includes: an arc extinguishing module 4;

[0078] Arc extinguishing module 4 is located at the bottom of the second cavity;

[0079] Arc extinguishing module 4 is used to transfer and absorb the electric arc generated when the main circuit is cut off.

[0080] In this embodiment, considering that the disconnection module will generate a huge arc signal instantaneously when it disconnects the fault current, it is proposed that the energy of the arc signal can be transferred and absorbed by the arc extinguishing module 4 to achieve protection of the main circuit.

[0081] Optionally, the arc extinguishing module 4 includes: an arc extinguishing grid or an arc extinguishing fuse.

[0082] In this embodiment, refer to Figure 3 As shown, in order to ensure the processing of arc signals, the arc extinguishing module 4 of this application uses an arc extinguishing grid plate. That is, after the main circuit copper busbar is disconnected, the arc is cut off by the arc extinguishing grid plate, thereby achieving efficient arc extinguishing and improving the system protection capability.

[0083] Optionally, refer to Figure 4 As shown, an external excitation source interface is provided on the outer wall of the second cavity; wherein, the external excitation source interface includes: a positive input interface IN+ and a negative input interface IN-.

[0084] External excitation source interface, used to connect to external excitation signals;

[0085] The second excitation source is also used to ignite the explosive in the second cavity to generate high pressure under the action of an external excitation signal, and drive the cut-off module to disconnect the main circuit under the action of high pressure.

[0086] In this embodiment, to improve the applicability of the circuit protection device, it is proposed that an external excitation source interface can also be provided on the outer wall of the second cavity. That is, the second excitation source can also receive external excitation signals input from the outside, and under the action of the external excitation signal, ignite the explosive in the second cavity. After the explosive is ignited, high-pressure gas is generated, and under the action of the high-pressure gas, the cut-off module is driven to disconnect the main circuit, thereby achieving protection of the main circuit and achieving the effect of dual protection of the main circuit.

[0087] Optionally, the above-mentioned cutting module includes at least one break point.

[0088] In this embodiment, multiple weak points are provided on the main circuit copper busbar, and each weak point corresponds to a break on the cutting module. This ensures that the cutting module can quickly cut off the main circuit copper busbar when performing the cutting action, thereby protecting the main circuit.

[0089] Optionally, refer to Figure 5 As shown, this application also provides an electrical appliance 200, which includes the circuit protection device 100 provided in the above embodiments.

[0090] For example, electrical equipment can be power equipment in different fields, such as transformers and generators in power systems, industrial motors, frequency converters and PLCs in the industrial field, and air conditioners, refrigerators and smart home appliances in the home appliance field.

[0091] In some embodiments, the circuit protection device can be integrated into a main branch of the electrical equipment. During the operation of the electrical equipment, the circuit protection device can detect the working current flowing through the main branch in real time, and when the working current at a certain moment exceeds a preset current threshold, the circuit is cut off, that is, the fault current is automatically cut off, so as to protect the electrical equipment from faults and ensure the safety of the electrical equipment and the stability of the power system.

[0092] Optionally, the present invention also provides a program product, such as a computer-readable storage medium, including a program that, when executed by a processor, is used to perform the above-described method embodiments.

[0093] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0094] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0095] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0096] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A circuit protection device, characterized in that, The circuit protection device includes: a passive drive module, an excitation module, and a cut-off module, wherein the excitation module and the cut-off module are both housed within a sealed housing; The first terminal of the passive drive module is connected to the input terminal of the main circuit in the circuit to be protected, the second terminal of the passive drive module is connected to the output terminal of the main circuit, and the third terminal of the passive drive module is connected to one end of the excitation module. The passive drive module is used to cut off the excitation module when a fault electrical signal is detected in the main circuit, so that the excitation module generates high voltage. The excitation module is used to drive the disconnection module to disconnect the main circuit after generating high voltage.

2. The circuit protection device according to claim 1, characterized in that, The passive drive module includes: a passive magnetic drive unit, an unlocking module, and an energy storage elastic component; One end of the passive magnetic drive unit is connected to the input end of the main circuit, and the other end of the passive magnetic drive unit is connected to the output end of the main circuit and one end of the unlocking module, respectively. The other end of the unlocking module is connected to one end of the energy storage elastic element, and the other end of the energy storage elastic element is connected to the input end of the excitation module. The passive magnetic drive unit is used to convert the fault electrical signal into a magnetic signal when the main circuit generates a fault electrical signal, and drive the unlocking module to unlock through the magnetic signal; The unlocking module is used to drive the energy storage elastic element to move and generate elastic potential energy after unlocking. The energy storage elastic element is used to drive the excitation module to generate high voltage through the elastic potential energy.

3. The circuit protection device according to claim 2, characterized in that, The incentive module includes: a first incentive source and a second incentive source; The first excitation source is disposed in the first cavity inside the sealed housing, and the second excitation source is disposed in the second cavity inside the sealed housing; A first through hole is provided at the connection surface between the first cavity and the second cavity; The first excitation source includes: a disconnection module, wherein, under normal operating conditions, the switching device in the disconnection module is normally closed; The first excitation source is used to drive the switching device in the disconnection module to switch from a normally closed state to a cut-off state under the action of the elastic potential energy, and generate an electric arc signal, and transmit the electric arc signal to the second cavity through the first through hole; The second excitation source is used to ignite the explosive in the second cavity under the action of the arc signal, generate high pressure, and drive the cut-off module to disconnect the main circuit under the action of high pressure.

4. The circuit protection device according to claim 2, characterized in that, The passive magnetic drive unit includes an iron core and a magnetic drive coil, wherein the iron core is annular, and the magnetic drive coil is wound around the iron core. The magnetic drive coil is used to convert the fault electrical signal into a magnetic signal when the main circuit generates a fault electrical signal. The iron core is used to move under the action of the magnetic signal to drive the unlocking module to unlock.

5. The circuit protection device according to claim 4, characterized in that, The magnetic drive coil has n turns and a magnetically adjustable range of 1-2In, where n is an integer greater than or equal to 1.

6. The circuit protection device according to claim 3, characterized in that, The circuit protection device further includes: an arc extinguishing module; The arc-extinguishing module is located at the bottom end of the second cavity; The arc-extinguishing module is used to transfer and absorb the electric arc generated when the main circuit is cut off.

7. The circuit protection device according to claim 6, characterized in that, The arc extinguishing module includes: an arc extinguishing grid or an arc extinguishing fuse.

8. The circuit protection device according to claim 3, characterized in that, The second cavity is also provided with an external excitation source interface; The external excitation source interface is used to receive input external excitation signals; The second excitation source is also used to ignite the explosive in the second cavity to generate high pressure under the action of the external excitation signal, and drive the cut-off module to disconnect the main circuit under the action of high pressure.

9. The circuit protection device according to claim 1, characterized in that, The cutting module includes at least one break point.

10. An electrical appliance, characterized in that, Includes the circuit protection device described in any one of claims 1-9.

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