Fusible cut-out

Abstract

The embodiment of the utility model provides a kind of fuse, it is related to fuse technical field.The embodiment of the utility model provides a kind of fuse, by the excitation source in shell body, piston and pre-break portion are arranged along height direction, and then the size of fuse in length direction is reduced, so that conducting row, excitation source and piston can fully utilize the space inside shell body along height direction, to make the structure of fuse more compact, smaller volume;Meanwhile, the first terminal, shell body and second terminal are sequentially arranged along height direction in the application, so that the temperature can be conducted along height direction when fuse works, optimizes the heat dissipation path, enhances the heat dissipation performance of fuse.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, and more specifically, to a fuse. Background Technology

[0002] Existing fuses include a housing and an excitation source, a piston, and a conductive plate disposed within the housing. The conductive plate is arranged along the height direction, and the excitation source and piston are arranged sequentially along the length direction on one side of the conductive plate. Because fuses are often assembled in multiple layers along the length direction, i.e., the excitation source and piston are stacked sequentially on the conductive plate along the length direction, the internal components of the fuse occupy a large space, resulting in a large overall size for existing fuses.

[0003] Meanwhile, the conductive plate is generally a flat plate structure in the shape of a straight line, and heat dissipation can only be achieved from both ends, which also makes the heat dissipation performance of the fuse structure poor. Utility Model Content

[0004] The purpose of this invention is to provide a fuse that can reduce the size of the fuse in the height direction and enhance the heat dissipation performance of the fuse.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a fuse, comprising: The outer casing contains a conductive busbar, an excitation source, and a piston. The conductive busbar has a pre-break section. The excitation source, the piston, and the pre-break section are arranged sequentially along the height direction. The excitation source is used to release driving force to drive the piston to disconnect the pre-break section when a trigger signal is received. The first terminal and the second terminal are arranged sequentially along the height direction. The first terminal passes through the housing and is connected to one end of the conductive bar, and the second terminal passes through the housing and is connected to the other end of the conductive bar.

[0006] In an optional embodiment, the conductive bus includes a first conductive bus and a second conductive bus. The first conductive bus includes a body, a first end and a second end. The body is provided with a pre-broken portion. The body is arranged along the width direction and the first end and the second end are respectively connected to opposite ends along the width direction. The first end and the second end are arranged along the height direction. The second conductive busbar is located on one side of the first conductive busbar along the height direction, and the first end is connected to one end of the second conductive busbar.

[0007] In an optional embodiment, the first conductive bus and the second conductive bus are disposed within the housing, with the second end connected to the first terminal block; the other end of the second conductive bus is connected to the second terminal block.

[0008] In an optional embodiment, the second conductive bus includes a third end and a fourth end connected to each other, the third end being disposed along the height direction and connected to the first end, and the fourth end being disposed along the width direction and connected to the second terminal block.

[0009] In an optional embodiment, the fuse includes a signal fuse and an arc-extinguishing fuse, with the first end and the third end connected via the signal fuse, and the arc-extinguishing fuse connected to both sides of the pre-break portion.

[0010] In an optional embodiment, the fuse includes an inner housing, the excitation source, the piston, and the pre-break portion are disposed within the inner housing, and the inner housing and the second conductive busbar are located on the same side; A sealed cavity is formed between one end of the excitation source that releases the driving force and the piston. The pre-break part is located in the sealed cavity. The piston is disposed opposite to the pre-break part. The excitation source is used to release the driving force to drive the piston to disconnect the pre-break part when a trigger signal is received.

[0011] In an optional embodiment, the fuse includes a circuit board and a transformer, the transformer being electrically connected to the circuit board; The transformer and the circuit board are both located on the side of the inner housing near the second conductive busbar; or, the transformer and the circuit board are respectively arranged on opposite sides of the inner housing along the height direction.

[0012] In an optional embodiment, the fuse includes a circuit board located on the side of the inner housing near the second conductive bar; The circuit board is arranged along the width direction, and the excitation source is arranged along the height direction. The excitation source is electrically connected to the circuit board via wiring; or, the circuit board is arranged along the height direction, and the excitation source is arranged along the width direction. The excitation source is inserted into and electrically connected to the circuit board via a sleeve.

[0013] In an optional embodiment, the outer shell is provided with a first cavity, and the first conductive busbar, the second conductive busbar, the inner shell, the excitation source and the piston are disposed in the first cavity, which is filled with an arc-quenching substance.

[0014] In an optional embodiment, the piston is arranged along the height direction, and the piston has at least one cutting end at one end near the pre-cut portion; The pre-break portion includes at least one pre-break, which is disposed opposite to the at least one cut end.

[0015] The beneficial effects of the fuse provided in this embodiment of the utility model include: Compared to existing technologies where the piston and excitation source are positioned along the length of the conductor bar on one side, this application arranges the excitation source, piston, and pre-break section within the housing along the height direction, thereby reducing the fuse's length dimension. This allows the conductor bar, excitation source, and piston to fully utilize the internal space of the housing along the height direction, resulting in a more compact and smaller fuse structure. Furthermore, by arranging the first terminal, housing, and second terminal sequentially along the height direction, this application enables heat to be conducted along the height direction during operation, optimizing the heat dissipation path and enhancing the fuse's heat dissipation performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model 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.

[0017] Figure 1 This is a schematic diagram of the fuse from a first-view perspective provided in this embodiment; Figure 2 This is a schematic diagram of the fuse from a second perspective provided in this embodiment; Figure 3 This is a schematic diagram of the structure of the first and second conductive busbars from a first-view perspective provided in this embodiment; Figure 4 This is a schematic diagram of the structure of the first and second conductive busbars from a second perspective, provided in this embodiment. Figure 5 This is a cross-sectional view of a fuse provided in this embodiment; Figure 6 A cross-sectional view of another fuse provided in this embodiment; Figure 7 This is a cross-sectional view of another type of fuse provided in this embodiment.

[0018] Icon: X - length direction; Y - width direction; Z - height direction; 010-Fuse; 100-First conductive bar; 110-Body; 111-Pre-break section; 1111-Pre-break opening; 120-First end; 130-Second end; 140-Flanged edge; 200-Second conductive bar; 210-Third end; 220-Fourth end; 300-Outer shell; 301-First cavity; 310-First terminal; 320-Second terminal; 400-Signal fuse; 500-Arc extinguishing fuse; 610-Inner shell; 620-Excitation source; 630-Piston; 631-Cut-off end; 640-Sealed cavity; 700-Circuit board; 800-Transformer; 810-Accommodation cavity. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] The following describes in detail the overall structure, working principle, and technical effects of the fuse 010 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0026] Please refer to Figures 1-2 The fuse 010 provided by this utility model can be applied in dual-control triggering systems, high and low voltage power distribution systems, control systems and electrical equipment as a short circuit and overcurrent protector.

[0027] Please refer to Figures 3-4 The present invention proposes a fuse 010, comprising: The outer casing 300 contains a conductive busbar, an excitation source 620, and a piston 630. The conductive busbar has a pre-break section 111. The excitation source 620, the piston 630, and the pre-break section 111 are arranged sequentially along the height direction Z. The excitation source 620 is used to release driving force to drive the piston 630 to disconnect the pre-break section 111 when a trigger signal is received. The first terminal 310 and the second terminal 320 are arranged sequentially along the height direction Z. The first terminal 310 passes through the outer casing 300 and is connected to one end of the conductive busbar, and the second terminal 320 passes through the outer casing 300 and is connected to the other end of the conductive busbar.

[0028] It is understandable that, compared to the prior art where the piston and excitation source are arranged on one side of the conductor bar along the length direction X, this application arranges the excitation source 620, piston 630, and pre-break portion 111 within the housing 300 along the height direction Z, thereby reducing the size of the fuse 010 in the length direction X. This allows the conductor bar, excitation source 620, and piston 630 to fully utilize the space inside the housing 300 along the height direction Z, making the fuse 010 more compact and smaller in size. At the same time, by arranging the first terminal 310, housing 300, and second terminal 320 sequentially along the height direction Z, the temperature of the fuse 010 is conducted along the height direction Z during operation, optimizing the heat dissipation path and enhancing the heat dissipation performance of the fuse 010.

[0029] In this embodiment, the conductive bus includes a first conductive bus 100 and a second conductive bus 200. The first conductive bus 100 includes a body 110, a first end 120 and a second end 130. A pre-break portion 111 is provided on the body 110. The body 110 is arranged along the width direction Y and the first end 120 and the second end 130 are respectively connected to opposite ends along the width direction Y. The first end 120 and the second end 130 are arranged along the height direction Z. The second conductive bus 200 is located on one side of the first conductive bus 100 along the height direction Z, and the first end 120 is connected to one end of the second conductive bus 200. It is understandable that, compared to existing technologies where the two conductive plates are generally arranged along the height direction Z, i.e., the two conductive plates form a straight flat structure, this application forms a bent conductive bar structure for the first conductive bar 100 and the second conductive bar 200. This allows the first conductive bar 100 and the second conductive bar 200 to fully utilize the internal space of the housing 300 along the height direction Z, and reduces the size of the fuse 010 in the length direction X, making the fuse 010 more compact and smaller in size. At the same time, the bent conductive bar structure of the first conductive bar 100 and the second conductive bar 200 increases the contact area between the first conductive bar 100 and the second conductive bar 200 and the arc-extinguishing material, thereby increasing the heat dissipation area of ​​the first conductive bar 100 and the second conductive bar 200 during operation and enhancing the heat dissipation performance of the fuse 010.

[0030] In this embodiment, please refer to Figures 1-2 The fuse 010 includes a housing 300, a first conductive bar 100 and a second conductive bar 200 disposed inside the housing 300. The housing 300 has a first terminal 310 and a second terminal 320 respectively at opposite ends along the height direction Z. The second end 130 is connected to the first terminal 310. The other end of the second conductive bar 200 is connected to the second terminal 320. In this embodiment, the outer casing 300 adopts a ceramic structure, and the ceramic material outer casing 300 has good heat dissipation performance. Of course, in optional embodiments, the outer casing 300 includes one or more of ceramic and plastic structures.

[0031] In this embodiment, please refer to Figures 5-7 The outer shell 300 is provided with a first cavity 301, and the first conductive bus 100, the second conductive bus 200, the inner shell 610, the excitation source 620 and the piston 630 are disposed in the first cavity 301. That is, the first cavity 301 is formed between the inner wall of the outer shell 300 and the outer wall of the inner shell 610, and the first cavity 301 is filled with an arc-quenching substance.

[0032] Optionally, the arc-extinguishing material includes at least silica sand. It is understood that silica sand has high thermal conductivity; at the same time, in the prior art, when the arc-extinguishing fuse 500 is installed in the stacked fuse 010, a housing is required. The arc-extinguishing material in this application uses silica sand, which replaces the housing used in the prior art for installing the arc-extinguishing fuse 500, further reducing the volume and making the fuse 010 structure more compact and smaller in size.

[0033] It should be noted that, due to the bent conductive busbar structure formed by the first conductive busbar 100 and the second conductive busbar 200, the contact area between the first conductive busbar 100 and the second conductive busbar 200 and the arc-extinguishing material is increased, thereby increasing the heat dissipation area of ​​the first conductive busbar 100 and the second conductive busbar 200 during the operation of the fuse 010; at the same time, the arc-extinguishing material is in contact with the outer casing 300, allowing the first conductive busbar 100 and the second conductive busbar 200 to dissipate heat through the quartz sand and the outer casing 300, thus enhancing the overall heat dissipation performance of the fuse 010.

[0034] In this embodiment, please refer to Figures 3-4 The fuse 010 includes a first conductive bar 100; the first conductive bar 100 includes a body 110, a first end 120 and a second end 130. The body 110 is provided with a pre-break portion 111. The body 110 is arranged along the width direction Y and the first end 120 and the second end 130 are respectively connected to opposite ends along the width direction Y. The first end 120 and the second end 130 are arranged along the height direction Z.

[0035] The second end 130 is also provided with a flange 140, which is set along the width direction Y. The flange and the body 110 face the same side, and the flange 140 is connected to the first terminal 310.

[0036] In this embodiment, please refer to Figures 3-4 The fuse 010 includes a second conductive bus 200; the second conductive bus 200 includes a third end 210 and a fourth end 220 connected to each other, the third end 210 is arranged along the height direction Z and connected to the first end 120, and the fourth end 220 is arranged along the width direction Y and connected to the second terminal 320.

[0037] It should be noted that the first conductive busbar 100 and the second conductive busbar 200 form an "S"-shaped bent conductive busbar structure, which can make full use of the space inside the outer casing 300, and at the same time, further increase the contact area between the first conductive busbar 100 and the second conductive busbar 200 and the arc-quenching substance.

[0038] In this embodiment, please refer to Figures 3-4 The fuse 010 includes a signal fuse 400, which is used to trigger a fault signal. The first end 120 and the third end 210 are connected through the signal fuse 400.

[0039] In this embodiment, please refer to Figures 5-7 The fuse 010 includes an arc-extinguishing fuse 500, which is used to conduct the current between the first conductive bus 100 and the second conductive bus 200. The arc-extinguishing fuse 500 is located on both sides of the pre-break section 111.

[0040] Optionally, the arc-extinguishing fuse 500 is connected to the second terminal 130 and the signal fuse 400.

[0041] In this embodiment, please refer to Figures 5-7 The fuse 010 includes an inner housing 610, an excitation source 620, a piston 630, and a pre-break section 111 disposed within the inner housing 610. The inner housing 610 and the second conductive bus 200 are located on the same side. A sealed cavity 640 is formed between the end of the excitation source 620 that releases the driving force and the piston 630. The pre-break section 111 is located within the sealed cavity 640. The piston 630 is disposed opposite the pre-break section 111. The excitation source 620 is used to release the driving force to drive the piston 630 to disconnect the pre-break section 111 when a trigger signal is received.

[0042] Specifically, the second cavity is filled with an arc-quenching material. Optionally, the arc-quenching material includes at least silica sand with high thermal conductivity.

[0043] In some embodiments, please refer to Figure 6 The piston 630 is positioned along the height direction Z, and the excitation source 620 is positioned along the height direction Z. In other embodiments, please refer to... Figure 5 and Figure 7 Both piston 630 and excitation source 620 are positioned along the height direction Z. The orientation of piston 630 and excitation source 620 can be selected according to actual needs.

[0044] In this embodiment, please refer to Figures 5-7 The piston 630 is arranged along the height direction Z, and the piston 630 has at least one cutting end 631 at one end near the pre-cutting part 111; the pre-cutting part 111 includes at least one pre-cutting opening 1111, and the at least one pre-cutting opening 1111 is arranged opposite to the at least one cutting end 631.

[0045] Optionally, the number of cutting ends 631 can be set to one, two, three, etc., then the number of pre-cut ends 1111 is consistent with the number of cutting ends 631, and multiple pre-cut ends 1111 are set one-to-one with multiple cutting ends 631.

[0046] In this embodiment, the piston 630 has two spaced-apart cutting ends 631 near the pre-cutting part 111; please refer to... Figure 3 The first conductive busbar 100 has two pre-breaks 1111 spaced apart on its body 110. The pre-breaks 1111 are groove structures arranged along the length direction X. The body 110 has pre-breaks 1111 on both sides along the height direction Z to improve the breaking capacity.

[0047] Please refer to Figures 5-7 The inner housing 610 has a receiving groove at the bottom of the main body 110 for receiving the cut part of the main body 110. The inner housing 610 has a column located in the receiving groove, and the column is connected to the main body 110.

[0048] In this embodiment, please refer to Figures 5-7 The fuse 010 includes a circuit board 700 and a transformer 800. The transformer 800 is electrically connected to the circuit board 700, and the circuit board 700 is electrically connected to the excitation source 620.

[0049] In some embodiments, please refer to Figures 6-7 The transformer 800 and circuit board 700 are both located on the side of the inner housing 610 near the second conductive busbar 200. It can be understood that by shortening the length of the second end 130 of the first conductive busbar 100, moving the body 110 and the positions of the excitation source 620 and piston 630 located in the inner housing 610 downward as a whole, and extending the length of the third end 210 of the second conductive busbar 200, space can be made for arranging the transformer 800 and circuit board 700.

[0050] In other embodiments, please refer to Figure 5 A transformer 800 and a circuit board 700 are respectively arranged on opposite sides of the inner housing 610 along the height direction Z. The inner housing 610 may have a receiving cavity 810 for accommodating the transformer 800 at the bottom of the main body 110. Of course, the transformer 800 may also be fixed to the side of the inner housing 610 near the first terminal 310 in other ways.

[0051] It is worth noting that the electrical connection method between the circuit board 700 and the excitation source 620 is related to the orientation of the circuit board 700 and the excitation source 620. Therefore, please refer to... Figures 5-7 The following are some examples for illustration.

[0052] In some embodiments, please refer to Figure 5 The circuit board 700 is located on the side of the inner housing 610 near the second conductive bus 200. The circuit board 700 is arranged along the width direction Y, and the excitation source 620 is arranged along the height direction Z. The excitation source 620 is electrically connected to the circuit board 700 through wiring. Furthermore, a transformer 800 and the circuit board 700 are respectively arranged on opposite sides of the inner housing 610 along the height direction Z.

[0053] In some embodiments, please refer to Figure 7 The circuit board 700 is located on the side of the inner housing 610 near the second conductive bus 200. The circuit board 700 is arranged along the width direction Y, and the excitation source 620 is arranged along the height direction Z. The excitation source 620 is electrically connected to the circuit board 700 through wiring. Furthermore, both the transformer 800 and the circuit board 700 are located on the side of the inner housing 610 near the second conductive bus 200.

[0054] In some embodiments, please refer to Figure 6The circuit board 700 is located on the side of the inner housing 610 near the second conductive bus 200. The circuit board 700 is positioned along the height direction Z, and the excitation source 620 is positioned along the width direction Y. The excitation source 620 is inserted into and electrically connected to the circuit board 700 through a sleeve. Furthermore, the transformer 800 is located on the side of the inner housing 610 near the second conductive bus 200, and the transformer 800 is located between the circuit board 700 and the third end 210.

[0055] The working principle of the fuse 010 provided in this utility model embodiment is as follows: Under normal circumstances, the first terminal 310 and the second terminal 320 are connected to the normal circuit, and the current flows sequentially through the second terminal 320, the second conductive bus 200, the arc-extinguishing fuse 500, the first conductive bus 100 and the first terminal 310; during this process, the heat generated by the arc-extinguishing fuse 500 and the signal fuse 400 can be dissipated through the first conductive bus 100, the second conductive bus 200 and the quartz sand through the outer casing 300.

[0056] When an overload, short-circuit current, or abnormal condition occurs, the signal fuse 400 blows, the excitation source 620 receives the trigger electrical signal and releases the driving force, driving the piston 630 to move toward the pre-break section 111. The piston 630 disconnects the pre-break port 1111 and disconnects the circuit.

[0057] In summary, the fuse 010 provided in this embodiment of the present invention, compared with the prior art in which the piston and excitation source are arranged on one side of the conductive busbar along the length direction X, arranges the excitation source 620, piston 630 and pre-break part 111 in the housing 300 along the height direction Z, thereby reducing the size of the fuse 010 in the length direction X. This allows the conductive busbar, excitation source 620 and piston 630 to make full use of the space inside the housing 300 along the height direction Z, making the structure of the fuse 010 more compact and smaller in size. At the same time, by arranging the first terminal 310, housing 300 and second terminal 320 in sequence along the height direction Z, the temperature of the fuse 010 is conducted along the height direction Z during operation, optimizing the heat dissipation path and enhancing the heat dissipation performance of the fuse 010.

[0058] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A fuse, characterized in that, include: The outer casing (300) contains a conductive busbar, an excitation source (620), and a piston (630). The conductive busbar has a pre-break section (111). The excitation source (620), the piston (630), and the pre-break section (111) are arranged sequentially along the height direction (Z). The excitation source (620) is used to release driving force to drive the piston (630) to disconnect the pre-break section (111) when a trigger signal is received. The first terminal (310) and the second terminal (320) are arranged sequentially along the height direction (Z). The first terminal (310) passes through the outer shell (300) and is connected to one end of the conductive bar. The second terminal (320) passes through the outer shell (300) and is connected to the other end of the conductive bar.

2. The fuse according to claim 1, characterized in that, The conductive bus includes a first conductive bus (100) and a second conductive bus (200). The first conductive bus (100) includes a body (110), a first end (120), and a second end (130). The pre-cut portion (111) is provided on the body (110). The body (110) is arranged along the width direction (Y) and the first end (120) and the second end (130) are respectively connected at opposite ends along the width direction (Y). The first end (120) and the second end (130) are arranged along the height direction (Z). The second conductive bus (200) is located on one side of the first conductive bus (100) along the height direction (Z), and the first end (120) is connected to one end of the second conductive bus (200).

3. The fuse according to claim 2, characterized in that, The second end (130) is connected to the first terminal (310); the other end of the second conductive bus (200) is connected to the second terminal (320).

4. The fuse according to claim 2, characterized in that, The second conductive bus (200) includes a third end (210) and a fourth end (220) connected to each other. The third end (210) is arranged along the height direction (Z) and connected to the first end (120). The fourth end (220) is arranged along the width direction (Y) and connected to the second terminal (320).

5. The fuse according to claim 4, characterized in that, The fuse (010) includes a signal fuse (400) and an arc-extinguishing fuse (500). The first end (120) and the third end (210) are connected through the signal fuse (400), and the arc-extinguishing fuse (500) is connected to both sides of the pre-break section (111).

6. The fuse according to claim 2, characterized in that, The fuse (010) further includes an inner housing (610), the excitation source (620), the piston (630) and the pre-break part (111) are disposed inside the inner housing (610), and the inner housing (610) and the second conductive bus (200) are located on the same side; The excitation source (620) releases a driving force at one end, forming a sealed cavity (640) with the piston (630). The pre-break part (111) is located in the sealed cavity (640), and the piston (630) is disposed opposite to the pre-break part (111). The excitation source (620) is used to release a driving force to drive the piston (630) to disconnect the pre-break part (111) when a trigger signal is received.

7. The fuse according to claim 6, characterized in that, The fuse (010) includes a circuit board (700) and a transformer (800), the transformer (800) being electrically connected to the circuit board (700); The transformer (800) and the circuit board (700) are both located on the side of the inner housing (610) near the second conductive bus (200); or, the transformer (800) and the circuit board (700) are respectively arranged on opposite sides of the inner housing (610) along the height direction (Z).

8. The fuse according to claim 6, characterized in that, The fuse (010) includes a circuit board (700) located on the side of the inner housing (610) near the second conductive bar (200); The circuit board (700) is arranged along the width direction (Y), and the excitation source (620) is arranged along the height direction (Z). The excitation source (620) is electrically connected to the circuit board (700) through wiring; or, the circuit board (700) is arranged along the height direction (Z), and the excitation source (620) is arranged along the width direction (Y). The excitation source (620) is inserted into and electrically connected to the circuit board (700) through a sleeve.

9. The fuse according to claim 6, characterized in that, The outer shell (300) is provided with a first cavity (301), the first conductive bus (100), the second conductive bus (200), the inner shell (610), the excitation source (620) and the piston (630) are disposed in the first cavity (301), and the first cavity (301) is filled with an arc-quenching substance.

10. The fuse according to claim 1, characterized in that, The piston (630) is arranged along the height direction (Z), and the piston (630) has at least one cut-off end (631) at one end near the pre-cutting part (111). The pre-break portion (111) includes at least one pre-break (1111), which is disposed opposite to the at least one cut end (631).

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