Low-voltage fuse with indication and signal output

Abstract

The utility model discloses a low -voltage fuse with fusing indication and signal output, including fuse body and fuse base, and fuse body includes porcelain pipe, first screw and second screw, and the both ends of porcelain pipe are equipped with paper gasket, and the both ends of porcelain pipe are fixedly installed with two aluminum cover plates through a plurality of second screw respectively, and paper gasket is located between aluminum cover plate and porcelain pipe, and one side of two aluminum cover plates is fixedly installed with copper contact knife through two first screw respectively, and silver melt is welded between two copper contact knives, the utility model discloses setting nylon trocar and impactor subassembly in fuse body, and cooperate with micro -switch in fuse base, and when fusing, automatically trigger micro -switch output electric signal, this design will fusing indication and signal output function built -in, avoided the trouble that traditional fuse needs additional sensor or reformation circuit, significantly simplified the installation process, reduced the failure point of external component simultaneously, improved the reliability and maintenance convenience of system in the harsh environment, reduced the possibility of false touch under the vibration environment.

Description

Technical Field

[0001] This utility model relates to the field of electrical protection device technology, specifically to a low-voltage fuse with fuse indication and signal output. Background Technology

[0002] Low-voltage fuses are common electrical protection devices. When a circuit fault occurs, the fuse element melts, and the arc is extinguished by an arc-quenching medium (such as silica sand), thus cutting off the circuit and protecting downstream equipment. Existing low-voltage fuses typically only provide mechanical indication, such as a visual indicator showing the fuse's status. However, in applications requiring remote signal output, such as offshore wind power systems, external sensors or line modifications are often necessary. This not only increases installation complexity but also reduces system reliability.

[0003] A low-voltage fuse, as described in application number CN201720597118.6 and authorized announcement date 20180109, includes a ceramic tube with openings at both ends and a fusible element disposed within the ceramic tube. The low-voltage fuse also includes an inner conductive metal cap and an outer conductive metal cap. The two inner conductive metal caps are respectively interference-fitted to the outer ends of the ceramic tube, and the fusible element and the inner conductive metal caps are electrically connected. The two outer conductive metal caps are respectively fixedly connected to the outer sides of the inner conductive metal caps and block the openings at both ends of the ceramic tube. Each outer conductive metal cap also has a threaded connection hole. According to the low-voltage fuse provided by this utility model, by having the inner conductive metal caps interference-fitted to the outer sides of the ceramic tube and the outer conductive metal caps fixedly connected to the outer sides of the inner conductive metal caps having threaded connection holes, the structure of the low-voltage fuse provided by this utility model is very stable and reliable, capable of resisting relatively severe bumps and vibrations, and meeting the usage requirements of new energy wind, solar, and energy storage, especially offshore wind power.

[0004] Low-voltage fuses break the circuit by melting the fusible element and extinguishing the arc with the help of an arc-quenching medium when a fault occurs. Existing devices mostly provide mechanical indications; if remote signal transmission is required, external sensors or wiring modifications are often necessary, resulting in complex installation and limited reliability. In offshore wind power, due to the difficulty of product replacement, fuses are frequently replaced as consumable parts. Therefore, fuse-based signal indication functions are generally incorporated into the initial design. Furthermore, semiconductor applications place demands on the breaking capacity of fuses… The requirements for characteristics and time-current consistency are high, and higher requirements are also placed on the convenience of installation and maintenance. Therefore, it is urgent to design a low-voltage fuse with fuse indication and signal output to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a low-voltage fuse with a fuse indication and signal output to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A low-voltage fuse with fuse indication and signal output includes a fuse element and a fuse base. The fusible link includes a ceramic tube, a first screw, and a second screw. Paper gaskets are provided at both ends of the ceramic tube. Two aluminum cover plates are fixedly installed at both ends of the ceramic tube by multiple second screws, with the paper gaskets positioned between the aluminum cover plates and the ceramic tube. Copper contact blades are fixedly installed on one side of each of the two aluminum cover plates by two first screws. Silver melt is welded between the two copper contact blades. The interior of the ceramic tube is filled with high-precision quartz sand, which surrounds the silver melt. A nylon pin is provided on one side of the outer wall of one of the aluminum cover plates, with one end of the nylon pin connected to an impactor assembly. One end of the impactor assembly is inserted into the high-precision quartz sand inside the ceramic tube. A plug is provided on one side of the outer wall of one of the aluminum cover plates. The fuse base is provided with a micro switch arranged corresponding to the nylon pin. The micro switch is triggered by the nylon pin to output a fuse-breaking electrical signal. The fuse base also includes an isolation cover, on which a groove is formed to cooperate with the nylon pin.

[0007] Furthermore, the impactor assembly includes a guide sleeve, which is fixed inside the ceramic tube, and an impact element is slidably mounted on one end of the guide sleeve.

[0008] Furthermore, a plug is inserted into one end of the impactor, and a capillary copper tube is inserted into the center of one end of the plug.

[0009] Furthermore, a copper fitting is welded to one end of the capillary copper tube, and a constantan wire tension spring is welded to one end of the copper fitting, with one end of the constantan wire tension spring bolted onto one of the aluminum cover plates.

[0010] Furthermore, a mounting spring is bolted to one end of the plug, and one end of the mounting spring is in contact with one end of the guide sleeve. A resistance wire is fixedly installed at the center of one side of the inner wall of the guide sleeve, and one end of the resistance wire passes through the mounting spring and is installed together with the capillary copper tube.

[0011] Furthermore, the fuse base is directly electrically connected to the wire, and the fuse element is installed on the fuse base by inserting and removing a fuse carrier. The micro switch is connected to an external control or alarm system via an auxiliary circuit, and is used to lock, cut off power, or provide a signal when the fuse blows.

[0012] Furthermore, the rated voltage of the fuse is AC 1500V and below, and the rated current is 80A to 250A; The time-current characteristic of the fuse has an error in the current direction not exceeding [a certain value]. ; The rated breaking capacity of the fuse element is not less than 50kA; The nylon ejector pin is 30mm long, and after impact, it ejects 48-52mm in length, with an impact force of 90. ; The internal metal components of the fuse are treated with anti-corrosion measures, and the structural components are reinforced to adapt to the offshore wind power environment.

[0013] In the above technical solution, the low-voltage fuse with fuse indication and signal output provided by this utility model has the following advantages: This invention incorporates a nylon pin and an impactor assembly within the fuse element, which works in conjunction with a microswitch in the fuse base. When the fuse is broken, the microswitch is automatically triggered to output an electrical signal. This design integrates the fuse indication and signal output functions, avoiding the inconvenience of adding external sensors or modifying the wiring required by traditional fuses. It significantly simplifies the installation process, reduces potential failure points caused by external components, and improves the reliability and ease of maintenance of the system in harsh environments.

[0014] This utility model impactor assembly includes components such as a guide sleeve, an impactor, a plug, a capillary copper tube, copper tubing, and a constantan wire tension spring. Precise action is achieved through a resistance wire and spring structure. When a fuse blows, the constantan wire tension spring melts, releasing energy to push the impactor and nylon pin, reliably triggering the microswitch. This design ensures the timeliness and accuracy of signal output while improving the fuse's breaking capacity and the consistency of its time-current characteristics, meeting the high-precision protection requirements of semiconductor applications.

[0015] This invention achieves a significant improvement in system safety and automation through the integrated design of a fuse base and a micro switch, combined with a high-performance fuse element. The fuse base is equipped with a micro switch and an isolation cover. The micro switch is connected to an external control or alarm system via an auxiliary circuit, enabling interlocking, power cut-off, or signal indication upon fuse failure. This provides electrical isolation and safety protection, supports remote monitoring and automated control, and reduces manual intervention, making it particularly suitable for applications requiring rapid fault response and system maintenance. Simultaneously, the fuse element features a high rated voltage and a large current range, a breaking capacity of no less than 50kA, and small time-current characteristic error. Furthermore, the internal metal components undergo anti-corrosion treatment and structural reinforcement, enabling it to withstand corrosion and vibration in harsh environments such as offshore wind power, ensuring high reliability and long service life, and meeting the requirements of modern power systems for breaking capacity, The stringent requirements for characteristics and consistency reduce replacement frequency and maintenance costs. Overall, this co-design not only optimizes electrical performance but also enhances environmental adaptability, providing a comprehensive solution for high-standard applications. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of a low-voltage fuse with fuse indication and signal output according to an embodiment of the present invention.

[0018] Figure 2 This is a side view of the copper contact blade and aluminum cover plate provided in an embodiment of a low-voltage fuse with fuse indication and signal output according to this utility model.

[0019] Figure 3 This is a schematic diagram of the impactor assembly structure provided for an embodiment of a low-voltage fuse with fuse indication and signal output according to the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Copper contact blade; 2. Ceramic tube; 3. Paper gasket; 4. Impactor assembly; 5. Aluminum cover plate; 6. Nylon ejector pin; 7. First screw; 8. High-precision quartz sand; 9. Silver melt; 10. Second screw; 11. Plug; 12. Guide sleeve; 13. Impact component; 14. Resistance wire; 15. Spring; 16. Plug; 17. Capillary copper tube; 18. Copper fittings; 19. Constantan wire tension spring. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-3 As shown in the figure, this utility model provides a low-voltage fuse with fuse indication and signal output, including a fuse element and a fuse base. The fuse includes a ceramic tube 2, a first screw 7 and a second screw 10. Paper gaskets 3 are provided at both ends of the ceramic tube 2. Two aluminum cover plates 5 are fixedly installed at both ends of the ceramic tube 2 by multiple second screws 10, and the paper gaskets 3 are located between the aluminum cover plates 5 and the ceramic tube 2. Copper contact blades 1 are fixedly installed on one side of the two aluminum cover plates 5 by two first screws 7. Silver melt 9 is welded between the two copper contact blades 1. The interior of the ceramic tube 2 is filled with high-precision quartz sand 8, and the high-precision quartz sand 8 surrounds the silver melt 9. A nylon pin 6 is provided on one side of the outer wall of one of the aluminum cover plates 5, and one end of the nylon pin 6 is connected to an impactor assembly 4. One end of the impactor assembly 4 is inserted into the high-precision quartz sand 8 inside the ceramic tube 2. A plug 11 is provided on one side of the outer wall of one of the aluminum cover plates 5. The fuse base is equipped with a micro switch arranged corresponding to the nylon pin 6. The micro switch is triggered by the nylon pin 6 to output a fuse-breaking electrical signal. The fuse base also includes an isolation cover with a slot formed on the isolation cover to cooperate with the nylon pin 6.

[0023] Specifically, in this embodiment, it includes a fuse element and a fuse base.

[0024] The fuse includes a ceramic tube 2, a first screw 7, and a second screw 10. The ceramic tube 2 is an insulating shell that contains quartz sand and the fused material. Paper gaskets 3 are provided at both ends of the ceramic tube 2 to seal the ends and prevent leakage of high-precision quartz sand 8. Two aluminum cover plates 5 are fixedly installed at both ends of the ceramic tube 2 by multiple second screws 10. The aluminum cover plates 5 are used to fix the copper contact blades 1 and the impactor assembly 4, and to conduct and transfer current. The paper gaskets 3 are located between the aluminum cover plates 5 and the ceramic tube 2. Two copper contact blades 1 are fixedly installed on one side of each of the two aluminum cover plates 5 by two first screws 7. The copper contact blades 1 are conductive media that connect the base and the circuit. A silver fused material 9 is welded between the two copper contact blades 1. 2. The interior is filled with high-precision quartz sand 8, which surrounds the silver melt 9. One of the aluminum cover plates 5 has a nylon pin 6 on one side of its outer wall. The nylon pin 6 transmits the impact force to the micro switch and has a 30mm stroke to prevent accidental contact. One end of the nylon pin 6 is connected to an impactor assembly 4, which is the core mechanism for triggering the signal when the melt is broken. In the normal power-on state, the current passes through the two copper contacts 1 to form a closed loop with the silver melt 9, balancing heat generation and heat dissipation, and ensuring stable circuit operation. One end of the impactor assembly 4 is inserted into the high-precision quartz sand 8 inside the ceramic tube 2. One of the aluminum cover plates 5 has a plug 11 on one side of its outer wall, which has a fastening and sealing function. The fuse base is equipped with a micro switch arranged corresponding to the nylon pin 6. When the micro switch is closed or opened, it sends a fuse alarm or lockout command to the external system through the auxiliary circuit. The micro switch is triggered by the nylon pin 6 to output a fuse-breaking electrical signal. The fuse base also includes an isolation cover with a slot formed on it that mates with the nylon pin 6.

[0025] This utility model provides a low-voltage fuse with fuse indication and signal output. By setting a nylon pin 6 and an impactor assembly 4 in the fuse body and cooperating with a micro switch in the fuse base, the micro switch is automatically triggered to output an electrical signal when the fuse is blown. This design integrates fuse indication and signal output functions, avoiding the trouble of adding external sensors or modifying the wiring required by traditional fuses. It significantly simplifies the installation process, reduces the failure points caused by external components, and improves the reliability and maintenance convenience of the system in harsh environments.

[0026] In one embodiment provided by this utility model, such as Figure 3As shown, the impactor assembly 4 includes a guide sleeve 12, which is fixed inside the ceramic tube 2. An impactor 13 is slidably mounted on one end of the guide sleeve 12, and a plug tube 16 is inserted into one end of the impactor 13. The plug tube 16 is used to fix the position of the capillary copper tube 17. The capillary copper tube 17 is inserted into the center of one end of the plug tube 16. A copper fitting 18 is welded to one end of the capillary copper tube 17, and a constantan wire spring 19 is welded to one end of the copper fitting 18. One end of the constantan wire spring 19 is bolted to one of the aluminum cover plates 5. A mounting spring 15 is bolted to one end of the plug tube 16. The transfer current causes the resistance wire 14 to melt, releasing the constraint on the mounting spring 15. The mounting spring 15 pushes the impactor 13 to rush out at high speed along the guide sleeve 12, with an impact force of 90. The impactor 13 pushes the nylon pin 6 to extend 30mm, precisely impacting the micro switch lever on the base. The micro switch closes / opens, sending a fuse alarm or lockout command to the external system through the auxiliary circuit. One end of the mounting spring 15 is in contact with one end of the guide sleeve 12. A resistance wire 14 is fixedly installed at the center of one side of the inner wall of the guide sleeve 12, and one end of the resistance wire 14 passes through the mounting spring 15 and is installed together with the capillary copper tube 17.

[0027] In another embodiment of this utility model, the fuse base is directly electrically connected to the wire, and the fuse element is installed on the fuse base by inserting and unplugging the fuse carrier. The micro switch is connected to an external control or alarm system via an auxiliary circuit to achieve interlocking, power-off, or signal indication when the fuse blows; The rated voltage of the fuse is AC 1500V and below, and the rated current is 80A to 250A; The time-current characteristic of the fuse has an error in the current direction not exceeding [a certain value]. ; The rated breaking capacity of the fuse element shall not be less than 50kA; The nylon ejector pin 6 is 30mm long, and after impact, it ejects 50mm, with an impact force of 90. ; The internal metal parts of the fuse are treated with anti-corrosion measures, and the structural components are reinforced to adapt to the offshore wind power environment.

[0028] Example 1 A low-voltage fuse with fuse indication and signal output includes a fuse element and a fuse base.

[0029] The fuse includes a ceramic tube 2, a first screw 7, and a second screw 10. The ceramic tube 2 is an insulating shell that contains quartz sand and the fused material. Paper gaskets 3 are provided at both ends of the ceramic tube 2 to seal the ends and prevent leakage of high-precision quartz sand 8. Two aluminum cover plates 5 are fixedly installed at both ends of the ceramic tube 2 by multiple second screws 10. The aluminum cover plates 5 are used to fix the copper contact blades 1 and the impactor assembly 4, and to conduct and transfer current. The paper gaskets 3 are located between the aluminum cover plates 5 and the ceramic tube 2. Two copper contact blades 1 are fixedly installed on one side of each of the two aluminum cover plates 5 by two first screws 7. The copper contact blades 1 are conductive media that connect the base and the circuit. A silver fused material 9 is welded between the two copper contact blades 1. 2. The interior is filled with high-precision quartz sand 8, which surrounds the silver melt 9. One of the aluminum cover plates 5 has a nylon pin 6 on one side of its outer wall. The nylon pin 6 transmits the impact force to the micro switch and has a 30mm stroke to prevent accidental contact. One end of the nylon pin 6 is connected to an impactor assembly 4, which is the core mechanism for triggering the signal when the melt is broken. In the normal power-on state, the current passes through the two copper contacts 1 to form a closed loop with the silver melt 9, balancing heat generation and heat dissipation, and ensuring stable circuit operation. One end of the impactor assembly 4 is inserted into the high-precision quartz sand 8 inside the ceramic tube 2. One of the aluminum cover plates 5 has a plug 11 on one side of its outer wall, which has a fastening and sealing function. The fuse base is equipped with a micro switch arranged corresponding to the nylon pin 6. When the micro switch is closed or opened, it sends a fuse alarm or lockout command to the external system through the auxiliary circuit. The micro switch is triggered by the nylon pin 6 to output a fuse-breaking electrical signal. The fuse base also includes an isolation cover with a slot formed on it that mates with the nylon pin 6.

[0030] Example 2 This embodiment further defines the features of Embodiment 1. The impactor assembly 4 includes a guide sleeve 12, which is fixed inside the ceramic tube 2. An impactor 13 is slidably mounted on one end of the guide sleeve 12, and a plug tube 16 is inserted into one end of the impactor 13. The plug tube 16 is used to fix the position of the capillary copper tube 17. A capillary copper tube 17 is inserted into the center of one end of the plug tube 16. A copper fitting 18 is welded to one end of the capillary copper tube 17, and a constantan wire spring 19 is welded to one end of the copper fitting 18. One end of the constantan wire spring 19 is bolted to one of the aluminum cover plates 5. A mounting spring 15 is bolted to one end of the plug tube 16. The transfer current causes the resistance wire 14 to melt, releasing the constraint on the mounting spring 15. The mounting spring 15 then pushes the impactor 13 out of the guide sleeve 12 at high speed, with an impact force of 90. The impact element 13 pushes the nylon pin 6 to extend 30mm, precisely impacting the micro switch lever on the base. The micro switch closes / opens, sending a fuse alarm or lockout command to the external system through the auxiliary circuit. One end of the mounting spring 15 is in contact with one end of the guide sleeve 12. A resistance wire 14 is fixedly installed at the center of one side of the inner wall of the guide sleeve 12, and one end of the resistance wire 14 passes through the mounting spring 15 and is installed together with the capillary copper tube 17. The fuse base is directly electrically connected to the wire, and the fuse element is installed on the fuse base by inserting and removing the fuse carrier. The micro switch is connected to an external control or alarm system via an auxiliary circuit to achieve interlocking, power-off, or signal indication when the fuse blows; The rated voltage of the fuse is AC 1500V and below, and the rated current is 80A to 250A. The time-current characteristic of the fuse has an error in the current direction not exceeding [a certain value]. ; The rated breaking capacity of the fuse element shall not be less than 50kA; The nylon ejector pin 6 is 30mm long, and after impact, it ejects 48-52mm in length, with an impact force of 90. ; The internal metal parts of the fuse are treated with anti-corrosion measures, and the structural components are reinforced to adapt to the offshore wind power environment.

[0031] Working principle: Under normal power-on, the current enters through the wires of the fuse base, flows through the two copper contacts 1 of the fuse element, and is transferred to the silver fusible element 9. The silver fusible element 9 is the core fusing element. Under rated current, the heat generated by the silver fusible element 9 and the heat dissipation reach a balance, and the circuit operates stably. The fuse element is filled with high-precision quartz sand 8, which surrounds the silver fusible element 9. It does not function normally, but prepares for arc extinguishing. At the same time, the impactor assembly 4 is in standby mode. The constantan wire tension spring 19 is pressed by the screws on the aluminum cover plate 5, keeping the mounting spring 15 in a compressed state. The impactor 13 is fixed by the guide sleeve 12, and the nylon ejector pin 6 does not move. When an overload or short circuit fault occurs... The fault current passes through the silver molten element 9, causing its temperature to rise rapidly until it reaches its melting point and melts. At the moment the silver molten element 9 melts, an electric arc is generated. High-precision quartz sand 8 acts as an arc-extinguishing medium, rapidly cooling and extinguishing the arc to ensure a breaking capacity of no less than 50kA and prevent arc propagation. Simultaneously, the fault current is transferred through the aluminum cover plate 5 to the impactor assembly 4. The current flows through the aluminum cover plate 5 into the constantan wire spring 19 and the resistance wire 14. The resistance wire 14 is sensitive to the transferred current, rapidly heating up and burning out. The constantan wire spring 19, as a fusible conductor, also melts due to current overload. After the constantan wire spring 19 and the resistance wire 14 burn out, the mounting spring 15 is released, generating a spring force, and the impact force reaches 90. The impactor 13 slides along the guide sleeve 12, and the impactor 13 strikes the nylon pin 6, which is pushed out. The nylon pin 6 is 30mm long, ensuring sufficient impact distance and force. The nylon pin 6 strikes the micro switch on the fuse base, triggering the micro switch and outputting an electrical signal. The micro switch is connected to an external control or alarm system through an auxiliary circuit to realize functions such as interlocking, power failure, or audible and visual alarms. The fuse base is equipped with an isolation cover, on which a groove is formed to cooperate with the nylon pin 6 to prevent accidental contact or arc leakage, improving operational safety. The ceramic tube 2 and paper gasket 3 provide insulation and sealing to prevent quartz sand leakage and withstand the marine environment. The entire fuse body is installed on the fuse base by plugging and unplugging the fuse carrier, which is convenient for maintenance and replacement. The internal metal parts are treated with anti-corrosion and the structural parts are reinforced to adapt to the vibration and corrosive environment of offshore wind power.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-voltage fuse with fuse indication and signal output, comprising a fuse element and a fuse base, characterized in that: The fuse includes a ceramic tube (2), a first screw (7) and a second screw (10). Paper gaskets (3) are provided at both ends of the ceramic tube (2). Two aluminum cover plates (5) are fixedly installed at both ends of the ceramic tube (2) by multiple second screws (10), and the paper gaskets (3) are located between the aluminum cover plates (5) and the ceramic tube (2). Copper contact blades (1) are fixedly installed on one side of the two aluminum cover plates (5) by two first screws (7). Silver melt (9) is welded between the two copper contact blades (1). The interior of the ceramic tube (2) is filled with high-precision quartz sand (8), and the high-precision quartz sand (8) surrounds the silver melt (9). A nylon pin (6) is provided on one side of the outer wall of one of the aluminum cover plates (5), and one end of the nylon pin (6) is connected to an impactor assembly (4). One end of the impactor assembly (4) is inserted into the interior of the high-precision quartz sand (8) inside the ceramic tube (2). A plug (11) is provided on one side of the outer wall of one of the aluminum cover plates (5). The fuse base is provided with a micro switch arranged corresponding to the nylon pin (6). The micro switch is triggered by the nylon pin (6) to output a fuse-breaking electrical signal. The fuse base also includes an isolation cover, on which a slot is formed to cooperate with the nylon pin (6).

2. A low-voltage fuse with fuse indication and signal output according to claim 1, characterized in that, The impactor assembly (4) includes a guide sleeve (12), which is fixed inside the ceramic tube (2), and an impactor (13) is slidably mounted on one end of the guide sleeve (12).

3. A low-voltage fuse with fuse indication and signal output according to claim 2, characterized in that, One end of the impactor (13) is connected to a plug (16), and a capillary copper tube (17) is connected to the center of one end of the plug (16).

4. A low-voltage fuse with fuse indication and signal output according to claim 3, characterized in that, One end of the capillary copper tube (17) is welded with a copper fitting (18), and one end of the copper fitting (18) is welded with a constantan wire spring (19), and one end of the constantan wire spring (19) is bolted to one of the aluminum cover plates (5).

5. A low-voltage fuse with fuse indication and signal output according to claim 4, characterized in that, A mounting spring (15) is bolted to one end of the plug (16), and one end of the mounting spring (15) is in contact with one end of the guide sleeve (12). A resistance wire (14) is fixedly installed at the center of one side of the inner wall of the guide sleeve (12), and one end of the resistance wire (14) passes through the mounting spring (15) and is installed together with the capillary copper tube (17).

6. A low-voltage fuse with fuse indication and signal output according to claim 1, characterized in that, The fuse base is directly electrically connected to the wire, and the fuse element is installed on the fuse base by inserting and unplugging a fuse carrier. The micro switch is connected to an external control or alarm system via an auxiliary circuit, and is used to lock, cut off power, or provide a signal when the fuse blows.

7. A low-voltage fuse with fuse indication and signal output according to claim 1, characterized in that, The rated voltage of the fuse is AC 1500V and below, and the rated current is 80A to 250A. The time-current characteristic of the fuse has an error of no more than ±10% in the current direction; The rated breaking capacity of the fuse element is not less than 50kA; The nylon pin (6) is 30mm long, and after impact, it pops out with a length of 48-52mm, and the impact force is 90N·m. The internal metal components of the fuse are treated with anti-corrosion measures, and the structural components are reinforced to adapt to the offshore wind power environment.

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