Power fuse

Abstract

A power fuse according to the present invention may comprise: a main body portion; at least one current-carrying member; a pair of terminal members; a pair of support members; and a partition wall portion. The main body portion may have a hollow portion. The at least one current-carrying member may be disposed in the hollow portion of the main body portion and may extend in the longitudinal direction of the hollow portion. The pair of terminal members may be respectively disposed at both ends of the main body portion to close both ends of the hollow portion, and both ends of the at least one current-carrying member may be electrically connected to the terminal members, respectively. The pair of support members have a central hole through which the at least one current-carrying member passes, and may be disposed between respective terminal members and the main body portion. The partition wall portion may be disposed in the hollow portion so as to be closer to the center of the hollow portion than the current-carrying member, and may have both ends supported by the pair of support members.

Description

Power fuse

[0001] The present invention relates to a power fuse, and more specifically, to a power fuse having a barrier structure capable of stabilizing a product during a manufacturing process and improving interruption performance.

[0002] Generally, a power fuse is a device that interrupts the current between a power source and a load when specific situations, such as overheating in the power source due to abnormal current, occur, and it is used as the most common circuit auxiliary device. Power fuses are widely used in electrical equipment such as power distribution systems and control systems, and they are one of the protective devices widely used as short-circuit and overcurrent protectors.

[0003] An example of such a power fuse is shown in FIGS. 1 and FIGS. 2. FIGS. 1 is a perspective view showing an example of a conventional power fuse, and FIGS. 2 is an exploded perspective view of the power fuse shown in FIGS. 1.

[0004] The main body (1) has a rectangular tube shape with a hollow portion (1a) and is formed of a ceramic material.

[0005] A plurality of conductive members (2), for example, four conductive members (2), are inserted into the hollow portion (1a) of the main body portion (1). The conductive members (2) are made of a material that has high electrical conductivity, such as silver (Ag), and has a relatively lower melting point compared to other metals.

[0006] Inner plates (3) are attached to both ends of the conductor (2). The inner plates (3) are formed from a material with high electrical conductivity, such as aluminum or copper.

[0007] A terminal terminal (4) protrudes from the inner plate (3).

[0008] A gasket (5) is placed on the outer surface of the inner plate (3). The gasket (5) is formed of an insulating material and serves to maintain airtightness inside the power fuse.

[0009] A holder (6) is placed on the outer side of the gasket (5). The holder (6) secures the gasket (5) and the inner plate (3) together to the main body (1) and maintains insulation from the outside.

[0010] The terminal (4) protrudes outward from the inner plate (3) through the holes formed in the gasket (5) and the holder (6) to the outside of the holder.

[0011] Since such conventional power fuses are simply structured such that a conductive element (2) is inserted into the hollow portion (1a) of the ceramic main body (1), it is difficult to maintain the product stably against factors such as external forces during the power fuse manufacturing process. Consequently, there is a problem in that the quality of the power fuse may be poor, such as a decrease in interrupting performance.

[0012] This problem can be solved by forming a partition (8) in the main body (1).

[0013] FIG. 3 is a cross-sectional view illustrating the main body (1) of a power fuse having a partition (8).

[0014] The main body (1) and the hollow portion (1a) of the main body (1) have a square cross-section, and a partition portion (8) formed in a square shape is provided within the hollow portion (1a). The partition portion (8) is formed integrally with the main body (1) using the same ceramic material as the main body (1).

[0015] The partition section (8) is formed by connecting four partitions (8a) that extend parallel to the edges of the main body section (1), and the corners of the partition section (8) and the corners of the main body section (1) are connected to each other by four connecting members (8b), thereby fixing the partition section (7) within the hollow section (1a) of the main body section (1).

[0016] By providing a partition (8) to the power fuse in this way, the product can be stabilized during the manufacturing process of the power fuse, and accordingly, the breaking performance of the finished power fuse can be improved.

[0017] However, since the partition (8) is arranged to surround the conductor (2) within the hollow portion (1a), in order to prevent interference between the partition (7) and the conductor (2) within the hollow portion (1a), the size of the hollow portion (1a) and the main body portion (1) containing it must be increased, and accordingly, the overall size of the power fuse must also be increased. In the case of a power fuse adopting such a partition structure, the minimum cross-sectional size of the main body portion is approximately 65mm x 65mm.

[0018] Consequently, it is difficult to apply the partition (7) as shown in FIG. 3 to small power fuses having a smaller size than this.

[0019] The objective of the present invention, devised to solve the problems of the prior art mentioned above, is to provide a power fuse having a partition structure that enables miniaturization of the power fuse while stably maintaining the product during the manufacturing process.

[0020] Another objective of the present invention is to provide a power fuse that is simple in structure and easy to manufacture, thereby facilitating miniaturization.

[0021] To achieve this purpose, a power fuse may be provided comprising a main body, at least one conductive member, a pair of terminal members, a pair of support members, and a partition member. The main body may have a hollow portion. At least one conductive member may be disposed within the hollow portion of the main body and may extend in the longitudinal direction of the hollow portion. A pair of terminal members may be disposed at each end of the main body, and both ends of at least one conductive member may be electrically connected to the terminal members. A pair of support members may be disposed between each terminal member and the main body, having a central hole through which at least one conductive member passes. The partition member may be disposed within the hollow portion so as to be closer to the center of the hollow portion than the conductive member, and both ends may be supported by the pair of support members.

[0022] In one embodiment, the partition may include at least one partition member having the shape of a flat plate extending from one end of the hollow portion to the other end, and the partition member may be coupled to the support member by inserting the two sides in the width direction of the two ends of the partition member that contact the support member into a pair of insertion grooves formed opposite to the inner circumference of the central hole of the support member.

[0023] In one embodiment, the bulkhead may include a pair of bulkhead members arranged orthogonally to each other in a cross shape.

[0024] In one embodiment, the diameter of the central hole of the support member may be smaller than the diameter of the hollow portion.

[0025] In one embodiment, the support member and the central hole of the support member may be formed as a square.

[0026] In one embodiment, a mounting groove for mounting a conductive member may be formed on the inner surface of the central hole of the support member.

[0027] In one embodiment, a cut surface may be formed at the corner portion between an adjacent pair of mounting grooves of the support member, and an insertion groove of the central hole may be formed at the cut surface.

[0028] In one embodiment, the support member may be made of an elastic insulating material.

[0029] In one embodiment, the power fuse may further include an insulating holder disposed on the outside of the terminal member.

[0030] In one embodiment, a plurality of fastening holes are formed in each of the insulating holder, terminal member, support member, and main body portion along the circumference of the hollow portion, and the insulating holder, terminal member, support member, and main body portion can be joined by a plurality of bolts that are fastened by passing through the corresponding fastening holes.

[0031] According to a power fuse according to one embodiment of the present invention, a partition section, with both ends supported by a support member, is positioned within the hollow section so as to be closer to the center of the hollow section than to the conductive member. That is, by positioning the partition section between the conductive members, a partition structure capable of stabilizing the product during the manufacturing process can be applied even to small power fuses compared to a conventional structure in which the partition section is positioned to surround the conductive member, and accordingly, quality such as the interruption performance of the finished small power fuse can also be improved.

[0032] In addition, instead of forming the bulkhead section integrally with the main body section as in the conventional method, by supporting it using a support member positioned at both ends of the main body section that acts as a gasket, the commonality of parts can be promoted and the configuration of the power fuse can be simplified, thereby reducing manufacturing costs.

[0033] FIG. 1 is a perspective view illustrating a conventional power fuse.

[0034] Figure 2 is an exploded perspective view of the power fuse shown in Figure 1.

[0035] FIG. 3 is a cross-sectional view illustrating the main body of a power fuse having a partition structure.

[0036] FIG. 4 is an exploded perspective view illustrating a power fuse according to one embodiment of the present invention.

[0037] Figure 5 is a front view of one side of the main body of the power fuse shown in Figure 4.

[0038] FIG. 6 is a front view illustrating a structure in which the partition portion of the power fuse shown in FIG. 4 is coupled to a support member.

[0039] FIG. 7 is a perspective view illustrating a support member and a partition of a power fuse according to another embodiment of the present invention.

[0040] FIG. 8 is a front view illustrating the combined structure of the support member and the bulkhead shown in FIG. 7.

[0041] Hereinafter, a power fuse according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are intended to enable those skilled in the art to easily understand and implement the present invention, and the technical concept and scope of the present invention are not limited by the preferred embodiments of the present invention illustrated in the accompanying drawings and described with reference thereto.

[0042] FIG. 4 is an exploded perspective view illustrating a power fuse (100) according to one embodiment of the present invention, FIG. 5 is a front view of one side of the main body part (110), and FIG. 6 is a front view illustrating a structure in which a partition wall is coupled to a support member (130).

[0043] A power fuse (100) according to one embodiment of the present invention comprises: a main body portion (110) having a hollow portion (115); at least one conductive member (120) disposed within the hollow portion (115) of the main body portion (110) and extending in the longitudinal direction of the hollow portion (115); a pair of terminal members (140) each disposed at both ends of the main body portion (110) to close both ends of the hollow portion (115), and each end of the at least one conductive member (120) being electrically connected; a pair of support members (130) disposed between each terminal member (140) and the main body portion (110), each having a central hole (135) through which the at least one conductive member (120) passes; and a partition portion (170) disposed within the hollow portion (115) so as to be closer to the center of the hollow portion than the conductive member, with both ends supported by the pair of support members (130).

[0044] The main body (110) is an outer casing or case. The main body (110) may have a cylindrical or rectangular cross-sectional shape. In the illustrated embodiment, the main body (110) is formed as a rectangular prism in the shape of a box or bar, and both side portions (here referring to the faces perpendicular to the axial direction) have a square shape. The length of each side of the square cross-section may be 45 mm.

[0045] In the main body (110), heat and pressure are formed at a high level due to the arc generated when the current-carrying member (120) is melted, and accordingly, the main body (110) must have excellent pressure resistance and heat resistance. To satisfy these requirements, the main body (110) is formed of a material that is resistant to heat and pressure, such as a ceramic material.

[0046] A hollow portion (115) is formed in the main body portion (110) along the axial direction, that is, along the length direction of the main body portion (110), penetrating the main body portion (110). The hollow portion (115) can be formed in a circular shape centered on the axis of the main body portion (110).

[0047] At least one conductive member (120) is inserted into the hollow portion (115) of the main body portion (110). In the illustrated embodiment, four conductive members are arranged within the hollow portion (115) of the main body portion (110).

[0048] The current-carrying member (120) cuts off the current between the power source and the load by melting when an abnormal current, such as an overcurrent, flows. When the current-carrying member (120) melts, an arc is generated, and the hollow portion (115) of the main body (110) functions as an arc extinguishing chamber or arc chamber to extinguish the arc. In order to extinguish the arc generated by the melting of the current-carrying member (120), an arc extinguishing material such as quartz sand is filled inside the hollow portion (115). Quartz sand is sand with a high quartz content and is suitable for arc extinguishing.

[0049] A fastening groove (112) is formed adjacent to each corner on both sides of the main body (110). A current-carrying member (120) is disposed within the hollow portion (115) of the main body (110). The current-carrying member (120) is the main material of the power fuse (100). The current-carrying member (120) conducts current between the power source and the load in a normal state, and in the event of an abnormal current exceeding an overcurrent, it breaks or melts to cut off the current.

[0050] For such a conductive member (120), a metal material having high electrical conductivity and a suitable melting point or fracture point, such as silver (Ag), may be used.

[0051] The conductive member (120) may be formed into a thin plate. At least one conductive member (120) may be provided. In the illustrated embodiment, four conductive members (120) are arranged within the hollow portion (115). The four conductive members (120) may be arranged up, down, left, and right with respect to the central axis of the hollow portion (115) as seen in FIG. 5.

[0052] The conductive member (120) is provided with a corrugated portion (126) and a fractured hole portion (128). A plurality of corrugated portions (126) and fractured hole portions (128) may be formed alternately along the longitudinal direction of the conductive member (120).

[0053] The corrugated portion (126) can be formed along the width direction of the conductive member (120). Accordingly, the corrugated portion (126) is formed in a wave-like pattern along the length direction of the conductive member (120).

[0054] The corrugated portion (126) can be formed by a part of the conductive member (120) being bent into a 'U' or 'V' shape to form an uneven portion.

[0055] These corrugated portions (126) provide elasticity to the conductive member (120). Therefore, when mechanical forces such as pulling or twisting are applied to the conductive member (120), the resistance to such forces increases.

[0056] In addition, the cross-sectional area of ​​the current-carrying member (120) is increased by the corrugated portion (126), which is advantageous for controlling the current capacity.

[0057] The fracture hole portion (128) is provided between the corrugated portions (126). The fracture hole portion (128) may consist of a plurality of circular holes. In this case, the plurality of circular holes may be arranged in a straight line along the width direction of the conductive member (120).

[0058] These fracture holes (128) become the melting points when an arc occurs. Since the fracture holes (128) are formed with a smaller unit area compared to other parts of the current-carrying member (120), the arc heat concentration is high, so melting occurs first.

[0059] The current resistance value may vary depending on the size and number of circular holes in the fracture hole portion (128). That is, the fracture holes are formed appropriately according to the setting of the current resistance value.

[0060] A pair of terminal members (140) are placed at both ends of the main body (110) to block the hollow portion (115).

[0061] The conductive member (120) and the terminal member (140) are electrically connected by welding both ends of the conductive member (120) to the terminal member (140). To this end, the terminal member (140) is formed from a material with high electrical conductivity, such as aluminum or copper.

[0062] The terminal member (140) is formed as a flat plate having a predetermined thickness. The terminal member (140) can be formed in a square shape.

[0063] A fastening hole (142) is formed at each corner of the terminal member (140). The fastening holes (142) of the terminal member (140) are formed at positions corresponding to the fastening holes of the main body part (110).

[0064] A terminal portion (145) protrudes from one side of the terminal member (140), that is, the side opposite to the side to which the conductive member (120) is connected, in a direction orthogonal to the surface of the terminal member (140). A terminal connection hole (146) is formed in the terminal portion (145). The terminal member (140) and the power source or load can be connected by inserting a cable or connection terminal of the power source or load into the terminal connection hole (146).

[0065] A support member (130) is interposed between the terminal member (140) and the main body part (110). The support member (130) serves to improve airtightness between the terminal member (140) and the main body part (110) while simultaneously supporting the conductive member (120).

[0066] FIG. 6 is a front view illustrating a support member (130).

[0067] The support member (130) is formed as a flat plate having a predetermined thickness. Here, the thickness of the support member (130) may be smaller than the thickness of the terminal member (140).

[0068] The support member (130) is provided with an elastic insulating material. The support member (130) is provided with an elastic material so that it is advantageous to maintain airtightness when compressed between the terminal member (140) and the main body part (110).

[0069] The support member (130) may be formed in a square shape overall. The edge of the support member (130) may be formed in the same shape as the edge of the side portion (111) of the main body portion (110). However, the external dimensions of the support member (130) may be formed smaller than those of the side portion (111).

[0070] A fastening hole (132) is formed in each corner of the support member (130). The fastening holes (132) of the support member (130) are formed at positions corresponding to the fastening holes (112, 142) of the main body part (110) and the terminal member (140).

[0071] Additionally, a central hole (135) is formed in the center of the support member (130). The central hole (135) may be formed in a square shape according to the overall shape of the support member.

[0072] The size of the central hole (135) is formed to be smaller than the cross-sectional size of the hollow portion (115) of the main body portion (110). Accordingly, the conductive member (120) can be installed at a predetermined distance from the wall portion of the main body portion (110) forming the hollow portion (115).

[0073] A mounting groove (136) is formed on the inner surface of the central hole (135) to support the end of the conductive member (120). The mounting groove (136) can be formed as a straight groove. In other words, the mounting groove (136) becomes a 'U'-shaped groove, excluding the opening. The mounting groove (136) is arranged in a square along the edge of the central hole (135) which forms a square. That is, the mounting groove (136) can be formed on the upper, lower, left, and right sides of the central hole (135).

[0074] The width of the mounting groove (136) is formed to be smaller than the diameter of the central hole (135) (the distance between the sides facing each other). That is, the mounting groove (136) has a predetermined distance from adjacent mounting grooves (136). Accordingly, the conductive members (120) mounted in each mounting groove (136) are spaced apart from each other.

[0075] The conductive member (120) can be supported more stably by mounting the end of the conductive member (120) in the mounting groove (136).

[0076] A cut surface (138) may be formed at the corner between adjacent mounting grooves (136). The cut surface (138) may be formed as a straight section like a chamfered surface or as a rounded curve. Through the cut surface (138), the conductive member (120) can be easily entered into the mounting groove (136). Additionally, unnecessary space occupation by the support member (130) can be minimized.

[0077] A holder (150) is provided on the outer side of the terminal member (140). The holder (150) may be formed as a square flat plate, similar to the support member (130). The thickness of the holder (150) may be smaller than the thickness of the terminal member (140).

[0078] It is preferable that the holder (150) be formed of an electrically insulating material.

[0079] A fastening hole (152) is formed in each corner of the holder (150). The fastening holes (152) of the holder (150) are formed at positions corresponding to the fastening holes (112, 132, 142) of the main body (110), the support member (130), and the terminal member (140).

[0080] A terminal insertion hole (155) is formed in the holder (150) through which the terminal portion of the terminal member (140) passes. The terminal insertion hole (155) is formed to have the same cross-sectional shape as the terminal portion (145) of the terminal member (140).

[0081] A plurality of fastening members (160), such as bolts, are fastened by penetrating the corresponding fastening holes (152, 142, 132, 112) of the holder (150), terminal member (140), support member (130), and main body part (110), thereby coupling the holder (150), terminal member (140), and support member (130) to the main body part (110). At this time, the support member (130) is compressed between the terminal member (140) and the main body part (110) to maintain airtightness. To prevent the fastening from coming undone, the fastening member (160) may be provided with an anti-loosening member (165), such as a washer.

[0082] Meanwhile, the bulkhead (170) is placed within the hollow portion (115) of the main body portion (110).

[0083] The partition section (170) is a partition member (175) in the form of a rectangular flat plate extending in the longitudinal direction of the main body section (110). As shown in FIG. 5, it is positioned diagonally within the hollow section (115) so as not to interfere with the conductive members (120) within the hollow section (115). The hollow section (115) is divided into two spaces by the partition section (170).

[0084] Both ends of the bulkhead portion (170) are supported by support members (130) disposed at both ends of the main body portion (110). FIG. 6 is a front view illustrating the coupling structure for the support members (130) of the bulkhead portion (170).

[0085] As illustrated in FIG. 6, an insertion groove (170) is formed in a pair of opposing corner portions of the central hole (135) of the support member (130), i.e., the cut surface (138). The widthwise portions of both ends of the partition member (175) are inserted into this pair of insertion grooves. By doing so, the partition portion (170) can be supported by the pair of support members (130) to traverse the interior of the hollow portion (115) of the main body portion (110) in the longitudinal direction.

[0086] According to the power fuse (100) according to one embodiment of the present invention as described above, a partition portion (170) having the shape of a rectangular flat plate is positioned to cross the interior of the hollow portion (115) at a position closer to the center of the hollow portion (115) than the conductive member (120), and is supported by support members (130) positioned at both ends of the main body portion (110). Accordingly, the size of the hollow portion (115) accommodating the conductive member (120) and the partition portion (170) can be reduced, and thus, the partition structure can be applied to a small power fuse in contrast to the conventional structure in which the size of the hollow portion is necessarily large because it is integrally formed in the main body portion to surround the conductive member. Since the product can be stabilized during the manufacturing process of a small power fuse to which such a partition structure can be applied, the quality of the finished product, such as the interruption performance, can be improved.

[0087] In addition, in a power fuse (100) according to one embodiment of the present invention, a partition (170) made separately from the main body (110) is disposed within the hollow portion (115) of the main body (110) and is supported by a support member (130) that acts as a gasket. Accordingly, since the main body (110), which is formed of a ceramic material, has a simple square frame structure, the configuration of the main body (110) can be simplified, and the commonality of parts can be achieved by using a gasket as the support member (130). With a simple configuration and the commonality of parts, the size of the power fuse can be more easily miniaturized and manufacturing can be facilitated.

[0088] FIGS. 7 and FIGS. 8 illustrate other examples of a bulkhead section (170'). FIG. 7 is a perspective view illustrating another example of a bulkhead section (170') and a support member (130), and FIG. 8 is a front view illustrating the combined structure of the bulkhead section (170') and the support member (130) illustrated in FIG. 7.

[0089] The partition section (170') illustrated in FIGS. 7 and 8 comprises a pair of partition members (175'). Each partition member (175') has the same shape as the partition member (175) in FIGS. 4 through 6, which is in the form of a rectangular flat plate extending in the longitudinal direction of the partition section (170), i.e., the main body section (110). The pair of partition members (175') are arranged orthogonally to each other in a cross ('+') shape so that their longitudinal central axes coincide with each other.

[0090] By means of a partition (170') having a cross ('+') shaped cross section, the hollow portion (115) of the main body (110) is divided into four spaces, and one conductive member (120) can be accommodated in each space.

[0091] Just like the partition (170) of FIGS. 4 to 6, the partition (170') of FIGS. 7 and 8 is also supported by a support member (130).

[0092] That is, as illustrated in FIG. 8, two pairs of opposing corner portions, i.e., cut surfaces (138), of the central hole (135) of the support member (130) are formed with insertion grooves (134), and the widthwise portions of both ends of a pair of partition members (175') constituting the partition portion (170') are inserted into these two pairs of insertion grooves (134). By doing so, the partition portion (170') can be supported to traverse the interior of the hollow portion (115) of the main body portion (110) in the longitudinal direction by a pair of support members (130) positioned at both ends of the main body portion (110).

[0093] In this way, a partition section (170') in which a pair of partition members (175') are arranged in a cross shape may have a better effect in stabilizing the product during the manufacturing process of a power fuse compared to a partition section (170) consisting only of a single partition member (175).

[0094] In the above description, a partition section (170) formed in the shape of a rectangular flat plate and a partition section (170') formed in the shape of a cross made of a pair of rectangular flat plates have been illustrated and described. However, in addition to this, any type of partition structure that is installed inside the hollow section (115) of the main body (110) and divides the interior of the hollow section (115) into multiple sections, such as a partition section formed in the shape of a Y ('Y'), may also be possible.

[0095] A power fuse (100) according to the embodiments of the present invention as described above can provide a partition structure that can stably maintain a product during the manufacturing process without increasing the size of the main body (110) as in a conventional power fuse, by installing a partition section (170, 170') having one or more partition members (175, 175') having a central axis that coincides with the central axis of the hollow section (115) within the hollow section (115), and by supporting both ends of the partition section (170, 170') by supporting members (130) disposed at both ends of the main body section (110). Accordingly, it is possible to provide a small power fuse with excellent quality.

[0096] The embodiments described above illustrate the best embodiments for implementing the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, these embodiments are merely for illustrative purposes, not for limiting the technical concept of the present invention. Consequently, it should be understood that the scope of the technical concept of the present invention is not limited by these embodiments. That is, the scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A main body part having a hollow section; At least one conductive member disposed within the hollow portion of the main body and extending in the longitudinal direction of the hollow portion; A pair of terminal members each disposed at both ends of the main body portion, and each end of the at least one conductive member is electrically connected to the other; A pair of support members disposed between each terminal member and the main body part, each having a central hole through which at least one conductive member passes; and A power fuse comprising a partition portion disposed within the hollow portion so as to be closer to the center of the hollow portion compared to the aforementioned conductive member, and having both ends supported by the aforementioned pair of support members.

2. In Paragraph 1, The above bulkhead portion includes at least one bulkhead member having the shape of a flat plate extending from one end of the hollow portion to the other end, and A power fuse in which the bulkhead member is coupled to the support member by inserting the widthwise portions of both ends of the bulkhead member that contact the support member into a pair of insertion grooves formed opposite to the inner circumference of the central hole of the support member.

3. In Paragraph 2, The above bulkhead section is a power fuse comprising a pair of bulkhead members arranged orthogonally to each other in a cross shape.

4. In Paragraph 1, A power fuse in which the diameter of the central hole of the above-mentioned support member is smaller than the diameter of the above-mentioned hollow portion.

5. In Paragraph 2, A power fuse in which the support member and the central hole of the support member are formed in a square shape.

6. In Paragraph 1, A power fuse having a mounting groove formed on the inner surface of the central hole of the support member for mounting the current-carrying member.

7. In Paragraph 6, A power fuse in which a cut surface is formed at the corner portion between an adjacent pair of mounting grooves of the support member, and an insertion groove of the central hole is formed on the cut surface.

8. In Paragraph 1, The above support member is a power fuse made of an elastic insulating material.

9. In Paragraph 1, A power fuse further comprising an insulating holder disposed on the outer side of the terminal member.

10. In Paragraph 9, A power fuse in which a plurality of fastening holes are formed in each of the insulating holder, the terminal member, the support member, and the main body portion along the circumference of the hollow portion, and the insulating holder, the terminal member, the support member, and the main body portion are joined by a plurality of bolts that pass through the corresponding fastening holes.

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