Driving mechanism and excitation fusing device for circuit protection device

Abstract

The invention relates to the field of circuit protection, in particular to a driving mechanism and excitation fusing structure for a circuit protection device, which comprises an excitation part and a moving part, and is characterized in that the moving part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action executing part; the first connecting rod is hinged to the second connecting rod, the third connecting rod is linked with the action executing piece, and at the initial position, the second connecting rod abuts against the third connecting rod, so that the elastic piece connected with the action executing piece is in a compressed state; the excitation part can act according to a received trigger signal to drive the first connecting rod and the second connecting rod to rotate, so that the third connecting rod loses constraint, and the action executing part linearly moves under the driving of elastic force. The driving mechanism is integrated and matched with the fusing structure to form an excitation fusing structure, and the fuse can be disconnected after the action execution piece acts. The driving mechanism is small in impact force, and small current can be broken when the driving mechanism is combined with the fusing structure.

Description

Technical Field

[0001] This invention belongs to the field of circuit protection, specifically relating to a drive mechanism for circuit protection devices, and an excitation fuse device that performs mechanical disconnection through the drive mechanism. Background Technology

[0002] Traditional fuses are devices that disconnect circuits by locally melting the circuit using the heat generated by the current. A major problem is that they can only passively break the circuit, especially when unexpected small currents occur. This requires a significant amount of time to accumulate the heat needed for melting, making it difficult to increase the breaking speed. Furthermore, using a switch to interrupt such small currents presents the challenge of achieving a higher breaking current capacity compared to traditional fuses. It requires distinguishing the overcurrent amplitude range, potentially leading to unsafe breaking situations. Especially for DC overcurrent faults, since DC has no zero-crossing point, ordinary air switches cannot utilize zero-crossing arc extinguishing, resulting in a significant reduction in breaking capacity. Currently, there is also an excitation fuse that uses a gas generator to release high-pressure gas as the driving force, displacing a piston to mechanically disconnect the conductive plate. These types of excitation fuses have a large breaking current. However, the conductive plate method used in excitation fuses is not easy to melt compared to traditional thermal fuses. Moreover, when a gas generator is used to release high-pressure gas as the driving force, the impact force generated is very large, and the casing is filled with a large amount of smoke and dust. This places high demands on the strength and materials of the fuse casing and other components. Otherwise, it can easily cause safety hazards such as casing cracking. Summary of the Invention

[0003] The purpose of this invention is to provide a driving mechanism and an excitation fuse for a circuit protection device. The driving mechanism uses an excitation source that can be converted into mechanical energy, such as electromagnetic energy, and works in conjunction with a linkage mechanism to achieve mechanical drive. It has low impact force, low requirements for housing strength, and can interrupt small currents.

[0004] To achieve the above objectives, the present invention provides a driving mechanism for a circuit protection device, comprising an excitation part and a motion part. The motion part includes a first link, a second link, a third link, and an actuating element. The actuating element is connected to an elastic element. One end of the first link and one end of the second link are hinged together. The third link is linked with the actuating element. In the initial position, the second link is movably abutting against the third link, and the elastic element connected to the actuating element is compressed through the third link.

[0005] The excitation unit can receive a trigger signal to apply a driving force to the first link, which drives the first link to rotate the second link, causing the second link to disengage from the third link, and the actuator moves linearly under the elastic drive.

[0006] Preferably, the excitation part is an electromagnet, and the first connecting rod is located on one side of the electromagnet.

[0007] Preferably, the actuator is inserted into the guide member, and the two ends of the actuator in the displacement direction are located outside the guide member.

[0008] Preferably, limiting walls are provided on the two opposite outer sides of the guide member, and the elastic member is disposed between the guide member and the limiting walls; one end of the actuating member extends outward from the part corresponding to the two limiting walls and passes through the two limiting walls. In the initial position, the third link presses against the extension of the actuating member, so that the elastic member is in a compressed state, and the actuating member is linked with the third link.

[0009] Preferably, a limiting member is fixedly provided on the outer periphery of the actuator, the limiting member passes through the guide member, one end of the limiting member located outside the guide member is connected to the elastic member, and the end of the limiting member connected to the elastic member extends outward and passes through the space between the two limiting walls. In the initial position, the third link crosses the limiting member of the actuator and presses against the extension of the limiting member, so that the elastic member is in a compressed state.

[0010] Preferably, the elastic element is a spring.

[0011] Preferably, the first link, the second link, and the third link are respectively mounted on corresponding rotating shafts, and the first link, the second link, and the third link are each rotatable relative to the rotating shaft.

[0012] Preferably, the first connecting rod and the second connecting rod are hinged by a connecting shaft, which passes through an arc-shaped waist-shaped hole.

[0013] Preferably, the excitation part and the moving part are located in adjacent housings, the excitation part and the first connecting rod are located in the excitation housing, and the second connecting rod, the third connecting rod, the elastic element and the motion actuator are located in the moving part housing. An oblong hole is provided on the side wall of the excitation housing and the moving part housing adjacent to each other to connect the excitation housing and the moving part housing. The connecting shaft for connecting the first connecting rod and the second connecting rod passes through the oblong hole.

[0014] Preferably, one end of the third link is rotatably mounted on the rotating shaft, and in the initial position, the other end crosses the actuating member and abuts against one end of the second link, pressing against one side of the actuating member.

[0015] The present invention also provides an excitation fuse device for circuit protection, wherein at least one fuse structure is provided on the displacement path of the actuator of the driving mechanism, the fuse structure includes a molten element passing through an arc-extinguishing medium, one end of the actuator passes through the fuse structure, and the molten element passes through one end of the actuator located in the fuse structure; when the excitation unit operates according to the received trigger signal, the third link disengages from the second link, and the actuator is displaced and disconnects the molten element under the elastic force of the elastic member.

[0016] Preferably, the fuse structure includes an upper shell and a lower shell, with an arc-extinguishing chamber filled with an arc-extinguishing medium and a displacement channel formed between the upper shell and the lower shell. A first conductor, the molten material, and a second conductor are sequentially connected and passed through the upper shell and the lower shell. The molten material passes through the displacement channel and the arc-extinguishing medium. One end of the actuating element passes through the displacement channel, and the molten material passes through the end of the actuating element located in the displacement channel. The ends of the first conductor and the second conductor located outside the upper shell and the lower shell are the connection ends of the excitation fuse device.

[0017] Preferably, a seal is provided between the contact surfaces of the upper and lower housings located outside the arc-extinguishing medium, through which the first and second conductors pass.

[0018] Preferably, one end of the actuator passing through the fusible structure is in sealed contact with the fusible structure.

[0019] The driving mechanism of this invention achieves mechanical drive through the magnetic force of an electromagnet and a linkage mechanism, resulting in minimal impact on the housing and lower requirements for housing strength. It overcomes the drawbacks of traditional gas generators, which rely on chemical explosions of propellants to release high-pressure gas as the driving force, leading to enormous impact forces and thus high requirements for the strength and materials of the housing and other components.

[0020] By optimizing the spatial layout of the linkage mechanism, space utilization is improved and product size is reduced.

[0021] By cooperating with the driving mechanism and the fuse structure to form an excitation fuse device, the fuse structure not only has the function of fusing, but can also mechanically disconnect the fusible element of the fuse structure through the driving mechanism, so that the traditional fuse has the unexpected small current breaking capacity, thus improving the small current breaking capacity of the fuse structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an excitation fuse device that combines a drive mechanism with a fuse structure.

[0023] Figure 2This is a schematic diagram of an excitation fuse device that combines a drive mechanism with three fuse structures.

[0024] Figure 3 This is a schematic diagram of the excitation unit and the first connecting rod structure.

[0025] Figure 4 This is a schematic diagram of the second and third links of the motion section and the actuator.

[0026] Figure 5 This is a schematic diagram of the structure combining the moving part and the fusion structure.

[0027] Figure 6 yes Figure 5 A schematic diagram of the structure after the melt breaks apart following the action.

[0028] Figure label:

[0029] Excitation unit 1, excitation source 11, excitation housing 12, motion unit 2, fusion structure 3, motion unit housing 20, first connecting rod 21, second connecting rod 22, third connecting rod 23, action actuator 24, connecting shaft 25, arc-shaped limiting hole 26, limiting component 27, power spring 28, guide cylinder 29, sealing ring 30, upper housing 31, lower housing 32, first conductor 33, melt 34, second conductor 35, arc extinguishing chamber 36, sealing component 37, motion unit bottom housing 38, top cover 39, limiting wall 40. Detailed Implementation

[0030] The drive mechanism for the circuit protection device of the present invention includes an excitation part and a motion part. The motion part includes a first link, a second link, a third link, and an action actuator. The action actuator is connected to an elastic member. One end of the first link and one end of the second link are hinged together. The third link is linked with the action actuator. In the initial position, the second link can movably abut against the third link, and the elastic member connected to the action actuator is compressed through the third link.

[0031] The excitation unit can receive a trigger signal to apply a driving force to the first link, which in turn drives the second link to rotate, causing the second link to disengage from the third link. The actuator then moves linearly under the force of the elasticity.

[0032] The excitation fuse device of the present invention has at least one fuse structure provided on the displacement path of the actuator of the driving mechanism. The fuse structure includes a molten body passing through the arc extinguishing medium. The actuator passes through the fuse structure to hold the molten body. When the excitation unit operates according to the received trigger signal, the actuator displacement can disconnect the molten body.

[0033] Regarding the above technical solutions, preferred embodiments are described in detail below. The directional terms used in this specification are limited by the orientations shown in the accompanying drawings and do not constitute a limitation on the technical solutions of this invention.

[0034] See Figures 1 to 6 The driving mechanism includes an excitation unit 1 and a motion unit 2. The excitation unit 1 includes an excitation source 11 and an excitation housing 12, with the excitation source 11 mounted on the excitation housing 12. The excitation source 11 is a component that can receive and operate upon an excitation signal; in this embodiment, it is an electromagnet, while in other embodiments, it is a device capable of converting other forms of energy into mechanical kinetic energy. Using an electromagnet as the excitation source prevents the generation of gunpowder smoke during the driving process. The signal receiving end of the excitation source 11 can be connected to an external trigger signal circuit, which provides a trigger signal to the excitation source 11. When an electromagnet is used, it operates according to the received electrical signal, generating a magnetic field. This magnetic field acts on the motion unit 2, causing it to complete the designed motion path and function.

[0035] The motion part 2 includes a motion part housing 20, and a first link 21, a second link 22, a third link 23, and an action actuator 24. The motion part housing 20 is disposed adjacent to the excitation housing 12. The first link 21 is located in the excitation housing 12, and the second link 22, the third link 23, and the action actuator 24 are located in the motion part housing 20. One end of the action actuator 24 passes through the motion part housing 20.

[0036] The first link 21 is located on one side of the electromagnet 11. The first link 21, the second link 22, and the third link 23 are rotatably mounted on corresponding rotating shafts, and each of the three links rotates relative to its respective shaft. By placing the excitation source 11 on one side of the first link 21, space is saved while facilitating the transmission of drive signals. The first link 21 is rotatably mounted on a rotating shaft in the excitation housing 12. The end of the first link 21 away from the electromagnet 11 and the end of the second link 22 are hinged together by a connecting shaft 25. An arc-shaped oblong hole 26 is provided on the side where the excitation housing 12 and the motion housing 20 are connected, and the connecting shaft 25 passes through the arc-shaped oblong hole 26. When the first link 21 rotates, it drives the second link 22 to rotate. The connecting shaft 25 then moves within the arc-shaped waist-shaped hole 26, limiting the initial and final positions of the first link 21 and the second link 22. The shared connecting shaft 25 of the first link 21 and the second link 22 simplifies the structure, facilitates movement, and saves product space. The end of the first link 21 closest to the electromagnet 11 serves as the end where the magnetic force of the electromagnet 11 acts. When the electromagnet 11 is energized and generates a magnetic force, the electromagnet 11 attracts the end of the first link 21 closest to it, causing it to move towards the electromagnet 11, thus driving the first link 21 to rotate around the axis. The second link 22 and the third link 23 are spaced apart on opposite sides of the moving part 2. The second link 22 is rotatably mounted on a shaft located on one side of the moving part housing. One end of the second link 22 is hinged to the first railing 21 via the connecting shaft 25, while the other end is free. One end of the third link 23 is rotatably mounted on a pivot located on the other side of the moving part housing, while the other end is a free end. The free end of the third link 23 can abut against the free end of the second link 22, or they can remain independent of each other through the rotation of the link.

[0037] The actuator 24 is located on one side between the pivots of the second link 22 and the third link 23. The actuator 24 is a rod-shaped structure capable of linear displacement. A limiting member 27 is fixedly installed on the outer periphery of one end of the actuator 24. A power spring 28 is located between the limiting member 27 and the moving part housing 20. In the initial position, the third link 23 presses against the limiting member 27, causing the power spring 28 to be in a compressed state. The extension and retraction of the power spring 28 can be guided by the internal structure of the moving part housing to ensure linear extension and retraction. For example, the power spring can be sleeved on a guide post, the limiting member 27 can pass through the outer periphery of the guide post and abut against the power spring 28, or the power spring 28 can be located in the guide space. The power spring supports the actuator 24 and causes it to move linearly under the action of the spring force. In the initial position, the free end of the third link 23 crosses over the outside of the actuator 24, and the free end of the second link 22 presses against the free end of the third link 23, causing the third link 23 to press against one side of the limiting member 27. This compression of the limiting member 27 compresses the power spring 28. The free end of the third link 23 then crosses over the limiting member 27 of the actuator 24 and abuts against the free end of the second link 22. Simultaneously, the third link 23 presses against the limiting member 27, compressing the power spring 28. This structure, where the third link crosses the limiting member, fully utilizes the space within the motion part housing, improving the space utilization rate and reducing the overall space required for the motion part housing.

[0038] To ensure smooth displacement of the actuator 24, a guide 29 is provided on the housing of the moving part 2. In this example, the guide 29 is a guide cylinder. The outer peripheral surface of the actuator 24, which passes through the guide 29, matches the inner wall of the guide 29, ensuring that the actuator 24 can smoothly move linearly along the guide 29. In this embodiment, a limiting member 27, fixed to the outer periphery of the actuator 24, passes through the guide 29. The structural part of the limiting member 27, which passes through the guide 29, matches the structure of the inner wall of the guide 29. The limiting member 27 moves linearly along the guide 29, causing the actuator 24, which is fixedly connected to it, to move together. The power spring 28 is located on one side of the outer periphery of the guide 29. To ensure that the actuator is evenly stressed and moves smoothly, the power spring 28 is evenly distributed on the outer periphery of the guide 29. One end of the limiting member 27 extends outward and abuts against one end of the power spring 28.

[0039] The actuator 24 is inserted into the guide 29, which facilitates the assembly, installation and replacement of the actuator and the fuse structure; and improves the transmission efficiency of the mechanism, making it easier to break the fuse.

[0040] When the electromagnet 11 receives a trigger signal (electrical signal) and is energized, the magnetic force generated attracts the first link 21, driving it to rotate around the pivot. When the second link 22, which is hinged to the first link 21, rotates synchronously to the termination position, the second link 22 disengages from the third link 23. The third link 23, freed from the restraint of the second link 22, rotates under the drive of the power spring 28. At the same time, the actuator 24 is displaced under the action of the elastic force, performing the corresponding action.

[0041] The aforementioned driving mechanism can be combined with the fuse structure 3 to form an excitation fuse device.

[0042] The fusible link structure 3 is a fuse structure installed on the displacement path of the actuator 24. The fusible link structure 3 includes a housing formed by an upper housing 31 and a lower housing 32. A first conductor 33, a fusible element 34, and a second conductor 35 are sequentially inserted through the upper housing 31 and the lower housing 32. The first conductor 33, the fusible element 34, and the second conductor 35 are connected in series. One end of the first conductor 33 and the second conductor 35 is located outside the housing as the connection end of the fusible link structure. Displacement channels are provided in the upper housing 31 and the lower housing 32 at positions corresponding to the actuator 24. A sealed arc-extinguishing chamber 36 is provided between the upper housing 31 and the lower housing 32 on both sides of the displacement channel, and the arc-extinguishing chamber is filled with an arc-extinguishing medium. The fusible element 33 passes through the arc-extinguishing medium and through the displacement channel. The fusible element 34 has a fusible neck and a weak point for mechanical breaking. Both the fusible neck and the weak point of the fusible element 34 are located in the arc-extinguishing medium. The end of the actuator 24 without a limiting member passes through the moving part housing 20 and extends into the displacement channel in the fusion structure 3, with the molten material 34 passing through the narrow hole at the end of the actuator 24. Of course, in some other embodiments, the molten material 34 can also be clamped at the end of the actuator 24. In this case, a clamping member needs to be provided at the end of the actuator 24.

[0043] The actuator 24, extending into the displacement channel, has a sealing groove protruding from its outer circumference. A sealing ring 30 is placed in the sealing groove, and the actuator 24 makes sealing contact with the displacement channel through the sealing ring 30. The sealing ring 30 is located on the side of the melt 34 facing the moving part. The sealing groove protruding from the outer circumference of the actuator 24 can limit the actuator 24, preventing it from breaking off one end of the melt 34 under elastic force and entering the moving part housing 20, thus losing the sealing contact between the actuator and the displacement channel.

[0044] A sealing element 37 is provided between the contact surfaces of the upper shell 31 and the lower shell 32 on the outside of the arc extinguishing chamber 36 to seal the gap between the contact surfaces of the upper shell 31 and the lower shell 32.

[0045] When the actuator 24 is displaced under the action of the elastic force, the actuator 24 can break the fusible element 34, disconnecting the main circuit where the fusible element 34 is located, and performing circuit protection. The fusible element 34 is broken at the weak point of disconnection, and the resulting mechanical fracture is located in the arc-extinguishing medium. The arc generated by the disconnection of the fusible element 34 is extinguished by the arc-extinguishing medium.

[0046] In some embodiments, the moving part 2 and the fusible structure 3 are spaced apart vertically and fixedly connected by bolts. The excitation part 1 is located on one side of the moving part 2 and the fusible structure 3 and is fixedly connected to the moving part 2 and the fusible structure 3 by bolts. The housing of the moving part 2 includes a bottom housing 38 and a top cover 39. The guide cylinder 29 is integrally formed with the bottom housing 38. The actuating member 24 passes through the guide member 29. Limiting walls 40 are respectively provided on the two opposite outer sides of the guide member 29. The limiting walls 40 have a U-shaped structure, and the two opposite limiting walls 40 form an elliptical limiting space. The power spring 28 is disposed in the guiding space formed between the guide cylinder 29 and the limiting walls 40. The limiting member 27 of the actuating member 24 moves along the limiting wall 40, and a part of the limiting member 27 passes through the gap between the two limiting walls 40 and is linked with the third link 23. By setting the power spring 28 in a certain guiding space through the above structure, the effective power of the energy stored in the power spring 28 can be improved. The second link 22 and the third link 23 are located in the housing of the moving part 2 outside the guide member 29 and the limiting wall, and are linked with the limiting member 27 of the actuating member 24. The first link 21 is located in the housing of the excitation part 1. The connecting shaft 25 connecting the first link 21 and the second link 22 passes through the housing of the excitation part 1 and the moving part 2.

[0047] The signal receiving end of the excitation source 11 in the excitation unit 1 is set on the housing of the excitation unit and can be connected to an external trigger signal circuit.

[0048] In some embodiments, multiple fusible structures 3 may be sequentially arranged, see [reference] Figure 2 There are three fusible structures. However, the end of the actuator 24 used for breaking the fuse needs to span multiple fusible structures 3 and hold the melt 34 in multiple fusible structures 2.

[0049] Working principle:

[0050] In the initial position, a displacement gap is maintained between the first link and the electromagnet, the second link abuts against the third link, the third link is linked with the actuator, and the actuator compresses the power spring to put it in a compressed state. The actuator connected to the power spring is in the initial position and clamps the molten material of the fuse structure.

[0051] During normal current flow, the first and second conductors of the fuse structure are connected in series with the protection circuit, and the current flows through the first conductor, the fusible element, and the second conductor.

[0052] When the circuit experiences overload, short circuit, or other abnormal conditions, the excitation source activates upon receiving the trigger signal, generating a magnetic field (or mechanical force) that drives the first connecting rod to rotate around the shaft. This, in turn, causes the second connecting rod to rotate. After rotating a certain angle, the second connecting rod disengages from the third connecting rod, releasing its restraint. The spring force of the power spring then drives the actuating component, now free of restraint, and the third connecting rod to displace together. During this displacement, the actuating component breaks the molten metal, thus disconnecting the circuit. Since the mechanical break of the molten metal is located within the arc-extinguishing medium, arc extinguishing occurs through this medium.

[0053] When there is an overload or short-circuit current of a large current, the fusible element may melt first and then be mechanically disconnected by the actuator.

[0054] Regardless of whether the melt breaks by melting or mechanically, the fracture surface is located in the arc-extinguishing medium, and the arc can be extinguished by the arc-extinguishing medium.

Claims

1. A drive mechanism for a circuit protection device, characterized in that, It includes an excitation part and a motion part. The motion part includes a first link, a second link, a third link, and an action actuator. The action actuator is connected to an elastic element. One end of the first link and one end of the second link are hinged together. The third link is linked with the action actuator. In the initial position, the second link can movably abut against the third link, and the elastic element connected to the action actuator is compressed through the third link. The excitation unit can receive a trigger signal to apply a driving force to the first link, which drives the first link to rotate the second link, causing the second link to disengage from the third link, and the actuator moves linearly under the elastic drive.

2. The driving mechanism for the circuit protection device according to claim 1, characterized in that, The excitation unit is an electromagnet, and the first connecting rod is located on one side of the electromagnet.

3. The drive mechanism for the circuit protection device according to claim 1, characterized in that, The actuator is inserted into the guide member, and the two ends of the actuator in the displacement direction are located outside the guide member.

4. The driving mechanism for the circuit protection device according to claim 3, characterized in that, Limiting walls are provided on the two opposite outer sides of the guide member, and the elastic member is disposed between the guide member and the limiting walls. One end of the actuating member extends outward from the part corresponding to the two limiting walls and passes through the two limiting walls. In the initial position, the third link presses against the extension of the actuating member, so that the elastic member is in a compressed state, and the actuating member is linked with the third link.

5. The drive mechanism for the circuit protection device according to claim 4, characterized in that, A limiting member is fixedly provided on the outer periphery of the actuator. The limiting member passes through the guide member. One end of the limiting member located outside the guide member is connected to the elastic member. The end of the limiting member connected to the elastic member extends outward and passes through the space between the two limiting walls. In the initial position, the third link crosses the limiting member of the actuator and presses against the extension of the limiting member, so that the elastic member is in a compressed state.

6. The driving mechanism for the circuit protection device according to claim 1, characterized in that, The elastic element is a spring.

7. The drive mechanism for the circuit protection device according to any one of claims 1 to 6, characterized in that, The first link, the second link, and the third link are respectively mounted on their respective rotating shafts, and each of the first link, the second link, and the third link can rotate relative to the rotating shaft.

8. The drive mechanism for the circuit protection device according to claim 7, characterized in that, The first connecting rod and the second connecting rod are hinged by a connecting shaft, which passes through an arc-shaped waist-shaped hole.

9. The drive mechanism for the circuit protection device according to claim 8, characterized in that, The excitation part and the moving part are respectively located in adjacent housings. The excitation part and the first connecting rod are located in the excitation housing. The second connecting rod, the third connecting rod, the elastic element and the motion actuator of the moving part are located in the moving part housing. An oblong hole is provided on the side wall of the excitation housing and the moving part housing adjacent to each other to connect the excitation housing and the moving part housing. The connecting shaft for connecting the first connecting rod and the second connecting rod passes through the oblong hole.

10. The drive mechanism for the circuit protection device according to claim 7, characterized in that, One end of the third link is rotatably mounted on the rotating shaft. In the initial position, the other end crosses the actuating member and abuts against one end of the second link, pressing against one side of the actuating member.

11. An excitation fuse device, characterized in that, At least one fusible structure is provided on the displacement path of the actuator of the drive mechanism according to any one of claims 1 to 10. The fusible structure includes a molten material passing through the arc-extinguishing medium. One end of the actuator passes through the fusible structure, and the molten material passes through one end of the actuator located in the fusible structure. When the excitation unit operates according to the received trigger signal, it causes the third link to disengage from the second link, and the actuator is displaced and disconnects the molten material under the elastic force of the elastic member.

12. The excitation fuse device according to claim 11, characterized in that, The fuse structure includes an upper shell and a lower shell. An arc-extinguishing chamber filled with an arc-extinguishing medium and a displacement channel are formed between the upper shell and the lower shell. A first conductor, the molten material, and a second conductor are sequentially connected and passed through the upper shell and the lower shell. The molten material passes through the displacement channel and the arc-extinguishing medium. One end of the actuating element passes through the displacement channel, and the molten material passes through the end of the actuating element located in the displacement channel. The ends of the first conductor and the second conductor located outside the upper shell and the lower shell are the connection ends of the excitation fuse device.

13. The excitation fuse device according to claim 12, characterized in that, A seal is provided between the contact surfaces of the upper and lower shells located outside the arc-extinguishing medium, through which the first and second conductors pass.

14. The excitation fuse device according to any one of claims 11 to 13, characterized in that, The actuator is inserted through one end of the fusible structure and is in sealed contact with the fusible structure.

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