Fuse

Abstract

To realize a compact fuse capable of appropriate interruption during high voltage.SOLUTION: A fuse 1 includes a flat-shaped fusible body 10 in which a narrow section 12 of small width and a wide section 14 of large width are alternately provided multiple times in the longitudinal direction, and a case 30 accommodating the fusible body 10 within its internal space. The case 30 has a first enclosing portion 36 surrounding the wide section 14 of the fusible body 10 and a second enclosing portion 38 surrounding the narrow section 12. The first cross-sectional area of the space enclosed by the first enclosing portion 36 around the wide section 14 is smaller than the second cross-sectional area of the space enclosed by the second enclosing portion 38 around the narrow section 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to fuses. [Background technology]

[0002] Fuses are used in electronic devices to prevent circuit breakdown due to the inflow of excessive current. The fuse described in Patent Document 1 below has a fusible element, which is a fuse element, inside a container, and when an abnormal current flows through a circuit in which the fuse is mounted, the fusible element melts, cutting off the current. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-27021 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, fuses have been installed in electric and hybrid vehicles, creating a demand for fuses that can cut off at high voltages. However, in order to properly cut off at high voltages, the fuses need to be larger.

[0005] The present invention has been made in view of these points, and has as its object to realize a small fuse that can properly cut off a high voltage. [Means for solving the problem]

[0006] In one aspect of the present invention, there is provided a fuse comprising: a flat-shaped fusible element having a plurality of narrow narrow portions and wide wide portions alternately arranged in the longitudinal direction; and a case containing the fusible element in an internal space, wherein the case has a first surrounding portion surrounding the wide portions of the fusible element and a second surrounding portion surrounding the narrow portions, and a first cross-sectional area of ​​the space surrounding the wide portions of the first surrounding portion is smaller than a second cross-sectional area of ​​the space surrounding the narrow portions of the second surrounding portion.

[0007] The first surrounding portion may be a convex portion protruding from an inner circumferential surface of the case, and the second surrounding portion may be a concave portion connected to the convex portion in the longitudinal direction.

[0008] The first surrounding portions and the second surrounding portions may be alternately and continuously connected in the longitudinal direction.

[0009] In addition, the first surrounding portion may surround a rectangular space that is a first distance away from the outer periphery of the wide portion, and the second surrounding portion may surround a circular space that is a second distance away from the center of the narrow portion in the radial direction, the second distance being longer than the first distance.

[0010] The second surrounding portion may surround the entirety of one of the narrow portions facing each other and the ends of the wide portions located on both sides of the narrow portion.

[0011] The length of the first surrounding portion in the longitudinal direction may be greater than the length of the second surrounding portion in the longitudinal direction.

[0012] The case may also have a cylindrical body and a surrounding member that is detachably attached to the inside of the cylindrical body and that has the first surrounding portion and the second surrounding portion formed therein.

[0013] The case may also have a block-shaped case body in which the internal space is formed and a lid body that covers the internal space, and the first surrounding portion and the second surrounding portion may be formed in the case body. [Effects of the Invention]

[0014] The present invention has the effect of realizing a small fuse that can properly cut off a high voltage. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing the external configuration of a fuse 1 according to one embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] FIG. 3 is a schematic diagram showing the cross-sectional configuration of FIG. 2. [Figure 4] FIG. 2 is a perspective view showing an example of the shape of a surrounding member 34. [Figure 5] 10 is a schematic diagram showing a modified example of the fusible element 10. FIG. [Figure 6] FIG. 2 is a schematic diagram showing the internal configuration of a fuse 100 according to a comparative example. [Figure 7] FIG. 7 is a schematic diagram showing the cross-sectional configuration of FIG. [Figure 8] FIG. 10 is a perspective view showing a case 60 of a fuse 2 according to a modified example. [Figure 9] 2 is a schematic diagram showing a fusible element 80 housed in a case body 62. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] <Fuse configuration> The configuration of the fuse according to the first embodiment will be described with reference to FIGS. Fig. 1 is a schematic diagram showing the external configuration of a fuse 1 according to one embodiment, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1.

[0017] The fuse 1 is inserted into a circuit of an electrical device or the like, and melts when an abnormal current flows through the circuit. Since the fuse 1 is installed in an electric vehicle or a hybrid vehicle, it is desirable that the fuse 1 be able to cut off power at high voltage. Here, the fuse 1 is cylindrical, but is not limited to this. As shown in FIG. 2 , the fuse 1 has a fusible element 10, terminals 20 and 22, a case 30, and lids 40 and 42.

[0018] The fusible element 10 has a long, thin plate shape as shown in Fig. 2. Both longitudinal ends of the fusible element 10 are connected to terminals 20, 22. The fusible element 10 is disposed in the internal space 31 of the case 30. Specifically, the fusible element 10 is disposed in a state in which it is aerial-supported in the internal space 31 by the terminals 20, 22. As shown in Fig. 2, the fusible element 10 has a narrow portion 12 and a wide portion 14.

[0019] The narrow portion 12 is a portion of the fusible element 10 that has a small width, and the wide portion 14 is a portion that has a large width. The narrow portion 12 is formed by cutting out both sides of the fusible element 10 in the width direction. The narrow portion 12 is the portion that melts first when the fusible element 10 generates heat. The fuse 1 melts when the narrow portion 12 melts. The wide portion 14 is the portion of the fusible element 10 other than the narrow portion 12. Multiple narrow portions 12 and wide portions 14 are provided alternately in the longitudinal direction of the fusible element 10.

[0020] The widthwise length of the narrow portion 12 is smaller than half the widthwise length of the wide portion 14. Here, as an example, the widthwise length of the narrow portion 12 is 1 / 3 the widthwise length of the wide portion 14, but is not limited to this. The longitudinal length of the narrow portion 12 is smaller than the longitudinal length of the wide portion 14. Here, as an example, the longitudinal length of the narrow portion 12 is 1 / 4 the longitudinal length of the wide portion 14, but is not limited to this.

[0021] The terminals 20 and 22 are external terminals connected to, for example, a circuit board. The terminal 20 is connected to one longitudinal end of the fusible element 10, and the terminal 22 is connected to the other longitudinal end of the fusible element 10. Specifically, the terminals 20 and 22 are connected to the fusible element 10 inside the case 30. The sides of the terminals 20 and 22 opposite to the connection with the fusible element 10 are exposed to the outside.

[0022] As shown in Figure 2, the case 30 has an internal space 31 that houses the fusible element 10. The case 30 surrounds a plurality of narrow portions 12 and wide portions 14 that are located in the internal space 31. In this example, the case 30 has a cylindrical shape, with the internal space 31 formed in the center. Both ends of the case 30 in the longitudinal direction (axial direction) are open. The longitudinal length of the case 30 is the same as the longitudinal length of the fusible element 10.

[0023] The case 30 includes, as an example, a cylindrical body 32 and an enclosing member 34. Here, the cylindrical body 32 is a cylindrical body having a cylindrical shape, but is not limited thereto. The enclosing member 34 is detachably attached to the inside of the cylindrical body 32. The enclosing member 34 defines an internal space 31 that encloses the narrow portion 12 and the wide portion 14. In this embodiment, by disposing the enclosing member 34 inside the cylindrical body 32, the cross-sectional area of ​​the internal space 31 changes in the longitudinal direction. Specifically, the enclosing member 34 defines the internal space 31 such that the space around the wide portion 14 is narrower than the space around the narrow portion 12. By changing the cross-sectional area of ​​the internal space 31 in this manner, it is possible to appropriately cut off even high voltages. The detailed configuration of the enclosing member 34 will be described later.

[0024] The lids 40 and 42 are located at both longitudinal ends of the fuse 1. The lid 40 covers an opening at one longitudinal end of the case 30, and the lid 42 covers an opening at the other longitudinal end of the case 30. The lids 40 and 42 cover the openings of the case 30, thereby sealing the internal space 31 inside the case 30. A through hole through which the terminal 20 passes is formed in the lid 40, and a through hole through which the terminal 22 passes is formed in the lid 42.

[0025] Although not shown in Fig. 2, an arc-extinguishing agent may be provided around the fusible element 10 in the internal space 31. The arc-extinguishing agent is, for example, sand. By providing an arc-extinguishing agent around the fusible element 10, the arc current can be suppressed.

[0026] <Detailed structure of the enclosure> The detailed configuration of the surrounding member 34 surrounding the fusible element 10 will be described with reference to FIGS.

[0027] 3 is a schematic diagram showing the cross-sectional configuration of FIG. 2. FIG. 3(a) shows a cross-sectional view taken along line BB of FIG. 2, and FIG. 3(b) shows a cross-sectional view taken along line CC of FIG. 2. The surrounding member 34 is made of, for example, resin. In this example, the surrounding member 34 is fitted into the cylindrical body 32. From a manufacturing standpoint, the surrounding member 34 can be separated into two parts, an upper part and a lower part. In this case, when assembling the fuse 1, a worker can surround the fusible element 10 with the surrounding member 34, and then install the fusible element 10 and the surrounding member 34 into the cylindrical body 32.

[0028] 2, the outer diameter of the surrounding member 34 is constant in the longitudinal direction, whereas the inner diameter of the surrounding member 34 is not constant in the longitudinal direction. Here, uneven steps are formed on the inner circumferential surface of the surrounding member 34.

[0029] A first surrounding portion 36 and a second surrounding portion 38 are formed on the inner peripheral surface side of the surrounding member 34. The first surrounding portion 36 is a portion that surrounds the wide portion 14, and the second surrounding portion 38 is a portion that surrounds the narrow portion 12. A plurality of first surrounding portions 36 and second surrounding portions 38 are formed so that the number of the first surrounding portions 36 and second surrounding portions 38 is equal to the number of the wide portions 14 and narrow portions 12. The first surrounding portions 36 and second surrounding portions 38 are alternately connected in succession in the longitudinal direction.

[0030] The size of the space where the first surrounding portion 36 surrounds the wide portion 14 is different from the size of the space where the second surrounding portion 38 surrounds the narrow portion 12. As can be seen by comparing FIGS. 3(a) and 3(b), the first cross-sectional area of ​​the space surrounded by the first surrounding portion 36 is smaller than the second cross-sectional area of ​​the space surrounded by the second surrounding portion 38. For example, the first cross-sectional area is smaller than 1 / 3 of the second cross-sectional area. Desirably, the first cross-sectional area is smaller than 1 / 5 of the second cross-sectional area. Note that the sizes of the first and second cross-sectional areas are desirably changed depending on the melting characteristics of the fuse 1 and the size of the fusible element 10.

[0031] As shown in Fig. 2, the first surrounding portion 36 is a convex portion that protrudes toward the fusible element 10. The first surrounding portion 36 is formed so as to go around the inner periphery of the surrounding member 34, and surrounds the outer periphery of the wide portion 14. As shown in Fig. 3(a), the first surrounding portion 36 surrounds a rectangular space that is a predetermined first distance away from the outer periphery of the wide portion 14, which has a rectangular cross section. This ensures that the distance between the first surrounding portion 36 and the wide portion 14 is constant.

[0032] As shown in FIG. 2, the second surrounding portion 38 is a recess that is connected to the protrusion (first surrounding portion 36) in the longitudinal direction of the case 30. Like the first surrounding portion 36, the second surrounding portion 38 is formed so as to go around the inner periphery of the surrounding member 34, and surrounds the outer periphery of the narrow portion 12. As shown in FIG. 3(b), the second surrounding portion 38 surrounds a circular space that is a predetermined second distance away from the center of the narrow portion 12 in the radial direction. The second distance is longer than the first distance. As a result, the distance between the second surrounding portion 38 and the narrow portion 12 is also approximately constant.

[0033] In the above description, the first surrounding portion 36 surrounds the rectangular space shown in Fig. 3(a), but this is not limiting. For example, the first surrounding portion 36 may surround a circular space, similar to the second surrounding portion 38. In this case, the circular space surrounded by the first surrounding portion 36 is narrower than the circular space surrounded by the second surrounding portion 38. In the above description, the first surrounding portion 36 surrounds a rectangular space that is a first distance away from the outer periphery (i.e., the long and short sides) of the rectangular wide portion 14, but this is not limiting. For example, the distance between the long sides of the wide portion 14 and the first surrounding portion 36 may be different from the distance between the short sides of the wide portion 14 and the first surrounding portion 36.

[0034] The longitudinal length of the first surrounding portion 36 is smaller than the longitudinal length of the wide portion 14. On the other hand, the longitudinal length of the second surrounding portion 38 is larger than the longitudinal length of the narrow portion 12. Therefore, the first surrounding portion 36 surrounds the longitudinal center portion of the opposing wide portion 14, while the second surrounding portion 38 surrounds the entire opposing one narrow portion 12 and the ends of the wide portion 14 located on both sides of the narrow portion 12. This allows the second surrounding portion 38 to reliably surround the narrow portion 12.

[0035] 2, the longitudinal length of the first enclosing portion 36 is greater than the longitudinal length of the second enclosing portion 38. However, this is not limited thereto, and for example, when the longitudinal length of the wide portion 14 is smaller than the longitudinal length of the narrow portion 12, the longitudinal length of the first enclosing portion 36 is smaller than the longitudinal length of the second enclosing portion 38.

[0036] As the shape of the surrounding member 34, from the viewpoint of manufacturing the resin surrounding member 34, for example, the shape shown in FIG. 4 can be adopted. Fig. 4 is a perspective view showing an example of the shape of the surrounding member 34. The surrounding member 34 shown in Fig. 4 can be divided into two parts, an upper part and an lower part. In this example, the surrounding member 34 has a cylindrical shape with a central part penetrating along the axial direction. In Fig. 4, a portion of the second surrounding part 38 in the circumferential direction is cut away, but this does not have to be cut away.

[0037] In the above, the shape of the fusible element 10 is the shape shown in Fig. 2, but is not limited to this. For example, the shape of the narrow portion 12 of the fusible element 10 may be the shape shown in Fig. 5. The second enclosing portion 38 described above can be applied even to the narrow portion 12 shown in Fig. 5.

[0038] FIG. 5 is a schematic diagram showing modified examples of the fusible element 10. FIG. 5(a) shows a first modified example of the fusible element 10, and FIG. 5(b) shows a second modified example of the fusible element 10. The narrow portion 12 of the fusible element 10 of the first modified example has a hole 13a in the center. The narrow portion 12 of the fusible element 10 of the second modified example is formed by providing two holes 13b. On the other hand, the wide portion 14 of the fusible element 10 of the first and second modified examples has the same configuration as the wide portion 14 of the fusible element 10 shown in FIG. 2, so a detailed description will be omitted. Even when the fusible elements 10 of the first and second modified examples are placed inside the case 30, the first surrounding portion 36 of the surrounding member 34 surrounds the wide portion 14, and the second surrounding portion 38 surrounds the narrow portion 12.

[0039] <Comparison with comparative examples> The advantages of providing the first enclosing portion 36 and the second enclosing portion 38 inside the case 30 as in this embodiment will be described below in comparison with comparative examples shown in FIGS.

[0040] First, the schematic configuration of the fuse according to the comparative example will be described. Fig. 6 is a schematic diagram showing the internal configuration of a fuse 100 according to a comparative example. Fig. 7 is a schematic diagram showing the cross-sectional configuration of Fig. 6. Fig. 7(a) shows a DD cross-sectional view of Fig. 6, and Fig. 7(b) shows an EE cross-sectional view of Fig. 6.

[0041] 2 and 6, the longitudinal length of the fuse 100 is greater than the longitudinal length of the aforementioned fuse 1. In other words, the longitudinal lengths of the fusible element 110 and case 130 of the fuse 100 are greater than those of the fuse 1. This is because the longitudinal length of the fuse 100 needs to be increased in order to enable the fuse 100 to be interrupted at a high voltage.

[0042] Furthermore, the comparative example does not have the aforementioned surrounding member 34 provided inside the cylindrical body 132 of the case 130 of the fuse 100. The inner circumferential surface 132a of the cylindrical body 132 surrounds the narrow portion 112 and the wide portion 114 of the fusible element 110. Therefore, the inner circumferential surface 132a functions as a first surrounding portion (first surrounding portion 136 shown in FIG. 7(a)) surrounding the wide portion 114 and a second surrounding portion (second surrounding portion 138 shown in FIG. 7(b)) surrounding the narrow portion 112.

[0043] In the comparative example, the cross-sectional shape of the space surrounded by the first surrounding portion 136 is circular as shown in Fig. 7(a). The cross-sectional shape of the space surrounded by the second surrounding portion 138 is also circular as shown in Fig. 7(b). The cross-sectional area of ​​the space surrounded by the first surrounding portion 136 is the same as the cross-sectional area of ​​the space surrounded by the second surrounding portion 138. In other words, the cross-sectional area of ​​the internal space within the cylindrical body 132 is constant in the longitudinal direction.

[0044] In contrast, in the fuse 1 of this embodiment, the first enclosing portion 36 and the second enclosing portion 38 are provided so that the cross-sectional area of ​​the internal space 31 in the case 30 changes in the longitudinal direction. Specifically, the first enclosing portion 36 and the second enclosing portion 38 are provided so that the first cross-sectional area of ​​the space enclosed by the first enclosing portion 36 is smaller than the second cross-sectional area enclosed by the second enclosing portion 38. This allows the fuse 1 to properly break at high voltages even if the length of the case 30 is short.

[0045] The length of the fusible element 110 of the fuse 100 of the comparative example is approximately 50 mm, while the length of the fusible element 10 of the fuse 1 of this embodiment is approximately 35 mm. As described above, the fuse 1 of this embodiment is miniaturized by shortening the length of the fusible element 10, but can properly cut off even at high voltages. Experiments have confirmed that the fuse 1 of this embodiment can properly cut off even under conditions where the circuit voltage is DC 600 V, the specific current is 6 kA, and the time constant τ is 0.5 ms.

[0046] <Modification> The case 30 in the above-described embodiment has the surrounding member 34 detachably attached to the inside of the cylindrical body 32, and the first surrounding portion 36 and the second surrounding portion 38 are formed in the surrounding member 34. However, the shape of the case may be, for example, the shapes shown in Figures 8 and 9.

[0047] Fig. 8 is a perspective view showing the case 60 of the fuse 2 according to the modified example. Fig. 9 is a schematic diagram showing the fusible element 80 housed in the case main body 62. In Fig. 8, for the sake of convenience in showing the internal configuration of the case main body 62, the case main body 62 and the lid body 70 are separated, and the fusible element 80 is omitted.

[0048] The case 60 has a box-like structure and houses therein a fusible element 80. The case 60 has a case body 62 and a lid 70, as shown in FIG.

[0049] The case body 62 is made of resin here and has a block shape. The case body 62 is provided with a storage section 63, which is an internal space for storing the fusible elements 80. The storage section 63 is formed by providing a recess in the upper surface 62a of the case body 62. The storage section 63 stores a plurality of fusible elements 80 (specifically, two fusible elements 80).

[0050] The lid 70 covers the accommodation portion 63 that accommodates the fusible element 80. The lid 70 is fitted into the case body 62 to cover the accommodation portion 63. This seals the accommodation portion 63 that accommodates the fusible element 80.

[0051] As shown in FIG. 9 , two fusible elements 80 are provided in the accommodation portion 63. The two fusible elements 80 are arranged parallel to each other within the accommodation portion 63. The two fusible elements 80 have the same shape. The fusible elements 80 are flat and have narrow portions 82 and wide portions 84. The narrow portions 82 and wide portions 84 are arranged alternately in the longitudinal direction, similar to the fusible elements 10 of the fuse 1. The shapes of the narrow portions 82 and wide portions 84 are the same as the shapes of the narrow portions 12 and wide portions 14 of the fusible element 10. The two fusible elements 80 are connected to terminals 86 at both longitudinal ends.

[0052] In this modification, a first surrounding portion 66 and a second surrounding portion 68 are formed in the case body 62. The first surrounding portion 66 and the second surrounding portion 68 are formed integrally with the case body 62. Therefore, in this modification, the surrounding member 34 is not necessary. As a result, the assembly of the fuse 2 is improved.

[0053] The first surrounding portions 66 and the second surrounding portions 68 are formed alternately in the longitudinal direction. Since two fusible elements 80 are accommodated in the accommodation portion 63, the first surrounding portions 66 and the second surrounding portions 68 are formed in two rows. The number of first surrounding portions 66 and second surrounding portions 68 is the same as the number of narrow portions 82 and wide portions 84 of the two fusible elements 80.

[0054] 9, the first surrounding portion 66 surrounds the wide portion 84 of the fusible element 80, and the second surrounding portion 68 surrounds the narrow portion 82 of the fusible element 80. Also in the modified example, the first cross-sectional area where the first surrounding portion 66 surrounds the wide portion 84 is smaller than the second cross-sectional area where the second surrounding portion 68 surrounds the narrow portion 82. For example, the first cross-sectional area is smaller than one-third of the second cross-sectional area. Desirably, the first cross-sectional area is smaller than one-fifth of the second cross-sectional area. In the modified example, by making the first cross-sectional area of ​​the space surrounded by the first surrounding portion 66 smaller than the second cross-sectional area of ​​the space surrounded by the second surrounding portion 68, fuse 2 can be made smaller, as with fuse 1, while still being able to properly cut off even at high voltages.

[0055] In the above description, two fusible elements 80 are accommodated in the accommodation portion 63, but the present invention is not limited to this. For example, the accommodation portion 63 may accommodate one fusible element 80.

[0056] <Effects of this embodiment> In the fuse 1 of the above-described embodiment, the case 30 has a first surrounding portion 36 surrounding the wide portion 14 of the fusible element 10 and a second surrounding portion 38 surrounding the narrow portion 12 of the fusible element 10. The first cross-sectional area surrounding the wide portion 14 of the first surrounding portion 36 is smaller than the second cross-sectional area surrounding the narrow portion 12 of the second surrounding portion 38. This makes it possible to realize a small fuse 1 that can cut off at high voltage even if the length of the fusible element 10 is shortened by making the space surrounded by the first surrounding portion 36 narrower than the space surrounded by the second surrounding portion 38.

[0057] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by functionally or physically distributing or integrating any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination also have the effects of the original embodiments. [Explanation of symbols]

[0058] 1 fuse 10 Soluble 12 Narrow area 14 Wide section 30 cases 32 Cylinder 34 Enclosure member 36 First Enclosure 38 Second Enclosure 60 cases 62 Case body 66 First Enclosure 68 Second Enclosure 70 Lid 80 Soluble 82 Narrow area 84 Wide section

Claims

1. a flat-plate-shaped fusible element having a plurality of narrow portions and wide portions alternately arranged in the longitudinal direction; a case containing the fusible element in an internal space; Equipped with the case has a first surrounding portion surrounding the wide portion of the fusible element and a second surrounding portion surrounding the narrow portion, A fuse, wherein a first cross-sectional area of ​​a space surrounding the wide portion of the first surrounding portion is smaller than a second cross-sectional area of ​​a space surrounding the narrow portion of the second surrounding portion.

2. the first surrounding portion is a protrusion protruding from an inner circumferential surface of the case, The second surrounding portion is a recess connected to the protrusion in the longitudinal direction.

10. The fuse of claim 1.

3. The first surrounding portions and the second surrounding portions are alternately and continuously connected in the longitudinal direction.

3. The fuse of claim 2.

4. the first surrounding portion surrounds a rectangular space that is a first distance away from an outer periphery of the wide portion, the second surrounding portion surrounds a circular space that is radially spaced from the center of the narrow portion by a second distance that is longer than the first distance; 10. The fuse of claim 1.

5. The second surrounding portion surrounds the entirety of one of the opposing narrow portions and the ends of the wide portions located on both sides of the narrow portion.

10. The fuse of claim 1.

6. The length of the first surrounding portion in the longitudinal direction is greater than the length of the second surrounding portion in the longitudinal direction.

10. The fuse of claim 1.

7. The case is A cylindrical body having a cylindrical shape; a surrounding member that is detachably attached to the inside of the cylindrical body and that has the first surrounding portion and the second surrounding portion formed therein; 10. The fuse of claim 1.

8. The case has a block-shaped case body in which the internal space is formed and a lid body that covers the internal space, The first surrounding portion and the second surrounding portion are formed in the case main body.

10. The fuse of claim 1.

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