Fuse body for power fuse and power fuse comprising same

Abstract

A fuse body for a power fuse, according to the present invention, comprises: an upper body; a lower body engaged with the upper body to define an inner space accommodating a fusible portion of a fuse element; and a sealing member sealing the inner space from the outside. The upper body and the lower body may be formed of engineering plastic. In addition, the present invention provides a power fuse comprising: a fuse element including a fusible portion that melts and breaks by an abnormal current and a pair of terminals disposed at both ends of the fusible portion; and the above-described fuse body coupled to the fuse element.

Description

Fuse body for a power fuse and a power fuse including the same

[0001] The present invention relates to a power fuse, and more specifically, to a fuse body for a power fuse and a power fuse including the same, wherein the size of the power fuse can be reduced and manufacturing costs can be reduced by forming the fuse body that accommodates the melting portion of the power fuse from a material that is easy to process and inexpensive.

[0002] Generally, a power fuse is a device that interrupts the current between a power source and a load when a specific situation, such as overheating in the power source due to abnormal current, occurs, 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 illustrated in FIGS. 1 and FIGS. 2. FIGS. 1 is a perspective view illustrating an example of a conventional power fuse (1), and FIGS. 2 is a perspective view illustrating only the fuse element (10) with the fuse body (20) removed from the power fuse (1) illustrated in FIGS. 1.

[0004] The power fuse (1) shown in FIGS. 1 and 2 comprises a fuse element (10) and a fuse body (20).

[0005] The fuse body (20) has a cylindrical shape with a hollow portion and is formed of a ceramic material.

[0006] The fuse element (10) includes a plurality of blowing plates (12), a pair of terminal bases (14) coupled to both sides of the blowing plates (12), and a pair of terminal members (16) extending outwardly from each terminal base (14).

[0007] The melting plate (12) is made of a material that has high electrical conductivity and a relatively low melting point compared to other metals, such as silver (Ag). At least one, for example, four, melting plates (12) are accommodated within the hollow portion of the housing (20). The melting plate (12) is provided with a melting pattern (13) that can be melted when an overcurrent is applied. The melting pattern (13) may be composed of a plurality of holes (13a) extending in the width direction of the melting plate (12).

[0008] The hollow portion of the fuse body (20) in which the fuse element (10)'s cutting plate (12) is received is filled with an arc-extinguishing material (not shown), such as quartz sand.

[0009] The terminal base (14) coupled to both sides of the blowing plate (12) closes both ends of the fuse body (20) that accommodates the blowing plate (12). A terminal member (16) extends from the outer surface of the terminal base (14) to the outside of the terminal base (14).

[0010] The terminal base (14) and the terminal member (16) are formed from a material with high electrical conductivity, such as aluminum or copper, and can be formed from the same material or a different material.

[0011] The cutting plate (12) and the terminal base (14) are joined to each other by welding such as spot welding, and the terminal member (16) and the terminal base (14) are joined to each other by brazing.

[0012] In this power fuse (1), the ceramic material used to manufacture the fuse body (20) that accommodates the fuse element (10)'s melting plate (12) and the arc extinguishing material is not only expensive but also difficult to process, and accordingly, there is a limit to reducing the size of the power fuse containing the ceramic fuse body (20).

[0013] The objective of the present invention, devised to solve the problems of the prior art mentioned above, is to provide a fuse body for a power fuse that is inexpensive and easy to process.

[0014] Another objective of the present invention is to provide a fuse body for a power fuse that can reduce the size of the product.

[0015] Another objective of the present invention is to provide a power fuse that can reduce overall manufacturing costs and miniaturize size by including a fuse body that is inexpensive and easy to process, as described above.

[0016] To achieve this purpose, a fuse body for a power fuse may be provided, which is coupled to a flat fuse element comprising a melting portion that melts due to an abnormal current and a pair of terminals disposed at both ends of the melting portion. The fuse body may include an upper body; a lower body that engages with the upper body to define an internal space accommodating the melting portion of the fuse element; and a sealing member that seals the internal space from the outside. The upper body and the lower body may be formed of engineering plastic.

[0017] In one embodiment, the upper body and the lower body each have a pair of side walls facing each other, and the interlocking side walls of the upper body and the lower body can define a through hole formed with a thickness and width equal to the thickness and width of the terminal of the fuse element.

[0018] In one embodiment, the interlocking side walls of the upper body and the lower body may have a sealing ring receiving groove formed by being recessed along the inner circumference of the through hole, and the sealing member may include a sealing ring inserted into the sealing ring receiving groove.

[0019] In one embodiment, the interlocking front walls and interlocking rear walls of the upper body and lower body may each have a sealing bar receiving groove formed along the longitudinal direction of the walls, and the sealing member may include a sealing bar inserted into the sealing bar receiving groove.

[0020] Preferably, a sealing bar receiving groove may be formed on the front wall and rear wall of either the upper body or the lower body, and a bar-shaped contact projection may be formed on the front wall and rear wall of either the upper body or the lower body to protrude into the sealing bar receiving groove and adhere to the sealing bar.

[0021] In one embodiment, the sealing bar receiving groove may be in communication with the sealing ring receiving groove, and the sealing bar may be connected to the sealing ring.

[0022] In one embodiment, at least one or both of the upper body and the lower body may each include at least one positioning pin extending in the upward and downward direction from the inner circumferential surface of the through hole.

[0023] In one embodiment, the upper body may be provided with an arc-extinguishing material filling hole for injecting an arc-extinguishing material into the internal space, and the arc-extinguishing material filling hole may be closed by a plug.

[0024] In one embodiment, the plug can be joined to the upper body by adhesive, ultrasonic welding, or laser welding.

[0025] Additionally, a power fuse comprising a fuse element and a fuse body may be provided. The fuse element may include a melting plate having a melting portion having a melting pattern formed thereon and a pair of terminal portions disposed on both sides of the melting portion; and a first terminal plate and a second terminal plate each coupled to the upper and lower sides of the terminal portions of the melting plate to form terminals of the fuse element together with the terminal portions. The fuse body may include an upper body having a cuboid shape with an open bottom surface; a lower body having a cuboid shape with an open top surface and engaging with the upper body to define an internal space that accommodates the melting portion of the fuse element; and a sealing member that seals the internal space from the outside. The interlocking side walls of the upper body and the lower body may be provided with a through hole formed with a thickness and width equal to the thickness and width of the terminal of the fuse element, and a sealing ring receiving groove formed by being recessed along the inner circumference of the through hole, and the interlocking front walls and rear walls of the upper body and the lower body may be provided with a sealing bar receiving groove formed along the longitudinal direction of the front wall and the rear wall, respectively. The sealing member may include a sealing ring inserted into the sealing ring receiving groove and a sealing bar inserted into the sealing bar receiving groove, and the upper body includes an arc extinguishing material filling hole for injecting an arc extinguishing material into the internal space, and the arc extinguishing material filling hole may be closed by a plug. The upper body and the lower body of the fuse body may be formed of engineering plastic.

[0026] In one embodiment, the terminal of the fuse element may have at least one positioning hole formed in a portion corresponding to a through hole in the case of the fuse body, and at least one or both of the upper body and the lower body may each include at least one positioning pin extending in an upward and downward direction from the inner circumferential surface of the through hole.

[0027] According to a fuse body for a power fuse according to one embodiment of the present invention, manufacturing costs can be reduced by using inexpensive and easy-to-process engineering plastic instead of expensive and difficult-to-process ceramic.

[0028] In addition, since the fuse body for a power fuse according to one embodiment of the present invention is easy to manufacture in a small size by using an engineering plastic that is easy to process, the power fuse including the fuse body of the present invention can be miniaturized.

[0029] In addition, the power fuse according to one embodiment of the present invention includes a flat fuse element in which the terminal and the melting portion are arranged on the same plane together with a fuse body manufactured using the engineering plastic described above, thereby not only reducing manufacturing costs but also miniaturizing its size.

[0030] FIG. 1 is a perspective view illustrating a conventional power fuse.

[0031] FIG. 2 is a perspective view illustrating the fuse element of the power fuse shown in FIG. 1.

[0032] FIG. 3 is a perspective view illustrating a power fuse according to one embodiment of the present invention.

[0033] FIG. 4 is a perspective view of a power fuse according to one embodiment of the present invention shown in FIG. 3, viewed from a different direction.

[0034] FIG. 5 is an exploded perspective view illustrating a power fuse according to one embodiment of the present invention illustrated in FIG. 3.

[0035] FIG. 6 is a plan view showing the upper body removed from a power fuse according to an embodiment of the present invention shown in FIG. 3.

[0036] FIG. 7 is a cross-sectional view of a power fuse according to one embodiment of the present invention taken along line VII-VII of FIG. 3.

[0037] FIG. 8 is a bottom perspective view illustrating the upper case of a power fuse according to one embodiment of the present invention.

[0038] FIG. 9 is an exploded perspective view illustrating a fuse element of a power fuse according to one embodiment of the present invention.

[0039] FIG. 10 is an exploded perspective view illustrating a fuse body according to another embodiment of the present invention.

[0040] Hereinafter, a fuse body according to a preferred embodiment of the present invention and a power fuse including the same 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 shown in the accompanying drawings and described with reference thereto.

[0041] FIGS. 3 and FIGS. 4 are perspective views of a power fuse according to an embodiment of the present invention viewed from different directions. FIG. 5 is an exploded perspective view illustrating a power fuse according to an embodiment of the present invention. FIG. 6 is a plan view illustrating the power fuse according to an embodiment of the present invention with the upper body removed. FIG. 7 is a cross-sectional view of a power fuse according to an embodiment of the present invention taken along line VII-VII of FIG. 3.

[0042] Referring to FIGS. 3 to 7, a power fuse according to one embodiment of the present invention includes a fuse element (100) and a fuse body (200).

[0043] The fuse element (100) includes a blowing plate (110), a first terminal plate (120), and a second terminal plate (130).

[0044] The melting plate (110) is a rectangular plate-shaped member in which a central melting portion (112) and a pair of terminal portions (114) arranged on both sides of the melting portion (112) are integrally formed. The melting plate (110) is made of a material that has high electrical conductivity and a relatively lower melting point compared to other metals, such as silver (Ag).

[0045] The melting portion (112) is provided with a melting pattern (117) that can be melted when an overcurrent is applied. The melting pattern (117) may include a row of multiple melting holes (117a) arranged in the width direction of the melting portion (112).

[0046] As can be particularly clearly seen from the exploded view of FIG. 9, a second terminal plate (130) is placed between a pair of cutting plates (110) to separate the pair of cutting plates (110).

[0047] The second terminal plate (130) has the same size and shape as the terminal portion (114) of the cutting plate (110) and is positioned between the mutually opposing terminal portions (114) of a pair of cutting plates (110).

[0048] A first terminal plate (120) is respectively placed above the terminal portion (114) of the upper cutting plate (110) and below the terminal portion (114) of the lower cutting plate (110).

[0049] The first terminal plate (120) and the second terminal plate (130) may be formed from a material with high electrical conductivity, such as aluminum, copper, or an alloy thereof. The first terminal plate (120) and the second terminal plate (130) may be formed from the same material or from different materials.

[0050] The first terminal plate (120), the terminal portion (114) of the fusion plate (110), and the second terminal plate (130) are integrally joined by a plurality of caulking protrusions (134) formed on the second terminal plate (130) penetrating the terminal portion (114) of the fusion plate (110) and the coupling holes (116, 124) formed on the first terminal plate (120) and caulking, thereby forming the terminal (102) of the fuse element (100).

[0051] The terminal (102) has at least one, preferably three, positioning holes (104) formed in a portion adjacent to the melting portion of the melting plate (110). The three positioning holes (104) may be arranged in the width direction of the terminal (102).

[0052] In this specification, unless otherwise noted, the longitudinal direction refers to the longitudinal direction of the fuse element (100), that is, the direction extending from one terminal (102) to the other terminal (102) of the fuse element (100), and the width direction refers to the width direction perpendicular to the longitudinal direction of the fuse element (100).

[0053] A positioning pin (2005) of the fuse body (200), which will be described later, is inserted into this positioning hole (104) to fix the fuse element (100) so that its position relative to the fuse body (200) does not change while the fuse element (100) is assembled to the fuse body (200).

[0054] In another example illustrated in FIG. 10, the positioning hole (104') of the terminal (102) may be formed in the shape of an elongated hole extending in the width direction of the terminal (102).

[0055] Unexplained reference numeral 106 is a fastening hole in which a power side or load side bus bar is fastened to a terminal (102).

[0056] The fuse body (200) includes an upper body (210), a lower body (220), and a sealing member (230).

[0057] The upper body (210) is a roughly cuboidal member with an open bottom surface. The lower body (220) is a roughly cuboidal member with an open top surface. The internal space of the fuse body (200) is limited by the upper body (210) and the lower body (220) interlocking with each other.

[0058] The upper body (210) and the lower body (220) are joined to each other by being fastened with screws at their respective corners. As shown in FIG. 4, the upper body (210) and the lower body (220) can be joined by four screws (2002) being inserted through fastening holes (2202) formed at four corners of the lower body (220) to fastening holes (2102) formed at corresponding four corners of the upper body (210). Alternatively, it is also possible to fasten the upper body (210) and the lower body (220) using bolts and nuts instead of screws.

[0059] The upper body (210) and the lower body (220) can be made of a material that has relatively good mechanical strength, is inexpensive, and has good processability, such as an engineering plastic like polyamide (PA).

[0060] The upper body (210) and the lower body (220) each include a front wall (212, 222), a rear wall (214, 224), and a pair of side walls (216, 226) that face each other and interlock.

[0061] The interlocking side walls (216, 226) of the upper body (210) and the lower body (220) define a through hole (2004). This through hole (2004) may have the same thickness and width as the terminal (102) of the fuse element.

[0062] A sealing ring receiving groove (2006) can be formed by being recessed along the inner surface of the through hole (2004).

[0063] A sealing bar receiving groove (2008) is provided between the interlocking front walls (212, 222) of the upper body (210) and the lower body (220) along the longitudinal direction of the front walls (212, 222). As shown in FIG. 7, the sealing bar receiving groove (2008) may be formed by being recessed to a predetermined depth in the front wall (212) of the upper body (210).

[0064] A contact projection (2009) may be formed on the front wall (222) of the lower body (220) to protrude into the interior of the sealing bar receiving groove (2008) of the upper body (210). The contact projection (2009) may protrude into the interior of the sealing bar receiving groove (2008) to the extent that it contacts the sealing bar (234), which will be described later and inserted into the sealing bar receiving groove (2008), and slightly presses the sealing bar (234) toward the upper body (210). By doing so, the sealing performance of the sealing bar (234) can be improved.

[0065] A sealing bar receiving groove (2008) and a contact projection (2009) may be formed between the rear walls (214, 224) of the upper body (210) and the lower body (220) that interlock with each other, just as in the front walls (212, 222).

[0066] Preferably, the sealing bar receiving groove (2008) formed in the front walls (212, 222) and rear walls (214, 224) may be in communication with the sealing ring receiving groove (2006) formed in the through hole (2004) of the side walls (216, 226). To this end, the sealing bar receiving groove (2008) may be formed to extend in the width direction toward the through hole (2004) at both ends.

[0067] Additionally, at least one pair, or in the illustrated example, three pairs of positioning pins (2005) may be formed on the outer side of the sealing ring receiving groove (2006) of the through hole (2004). The positioning pins (2005) may include three positioning pins (2005) extending downward from the inner surface of the through hole (2004) of the upper body (210) and three positioning pins (2005) extending upward from the inner surface of the through hole (2004) of the lower body (220) and contacting the positioning pins (2005) of the upper body (210).

[0068] These positioning pins (20005) are inserted into the positioning holes (104) of the terminal (102) of the fuse element described above and come into contact with each other within the positioning holes (104). Accordingly, when the fuse element (100) and the fuse body (200) are assembled, the fuse element (100) can be prevented from moving relative to the fuse body (200).

[0069] The diameter of the positioning pin (2005) may be the same as or slightly smaller than the diameter of the positioning hole (104).

[0070] In the illustrated example, the positioning holes (104) of the fuse element (100) and the positioning pins (2005) of the fuse body (200) are arranged in a line along the width direction of the fuse element (100). However, the positioning holes (104) and the positioning pins (2005) are not necessarily arranged in a line and may be arranged offset from each other.

[0071] Additionally, in the illustrated example, the positioning pins (2005) extend from both the upper body (210) and the lower body (220) and come into contact inside the positioning hole (104) of the fuse element (100).

[0072] In an alternative example, the positioning pins (2005) may extend only from one of the upper body (210) and the lower body (220). For example, the positioning pins (2005) may extend downward from the inner surface of the through hole (2004) of the upper body (210) through the positioning hole (104) of the fuse element (100) to contact the lower body (220). Conversely, the positioning pins (2005) may extend upward from the inner surface of the through hole (2004) of the lower body (220) through the positioning hole (104) of the fuse element (100) to contact the upper body (210).

[0073] In another example illustrated in FIG. 10, the positioning pin (2005') may be formed in the shape of a bar extending in the width direction of the fuse element (100) so as to be inserted into the positioning hole (104') of the fuse element formed in the shape of an elongated hole.

[0074] An arc-extinguishing material injection hole (240) may be provided on the upper surface of the upper body (210), and a plug (250) that seals the arc-extinguishing material injection hole (240) may be coupled to the arc-extinguishing material injection hole (240).

[0075] The arc injection hole (240) may include a large diameter portion (242) formed by penetrating the central part of the upper surface of the upper body (210), a ring-shaped small diameter portion (244) provided inside, and a connecting piece (246) connecting the bottom surface of the large diameter portion (242) and the small diameter portion (244).

[0076] The diameter of the plug (250) may be approximately equal to the inner diameter of the large diameter portion (242), and the thickness of the plug (250) may be approximately equal to or slightly smaller than the distance between the upper surface of the small diameter portion (244) and the upper surface of the large diameter portion (242). The plug (250) can seal the arc-extinguishing material injection hole (240) by being inserted into the large diameter portion (242) and then fixed to the upper surface of the upper body (210) that defines the arc-extinguishing material injection hole (240) by means such as adhesive or welding using a laser or ultrasonic waves.

[0077] In another example illustrated in FIG. 10, the plug (250') may have a hollow cylindrical shape with an open bottom.

[0078] The height of the plug (250') may be approximately equal to or slightly smaller than the distance between the upper surface of the large diameter portion (242) and the connecting piece (246). The thickness of the circular wall may be approximately equal to the width between the large diameter portion (242) and the small diameter portion (244). Accordingly, when the plug (250') is inserted into the arc-filling injection hole (240), the lower end of the plug (250') may be fitted between the large diameter portion (242) and the small diameter portion (244) of the arc-filling injection hole (240).

[0079] The sealing member (230) includes a pair of sealing rings (232) and a pair of sealing bars (234).

[0080] The sealing ring (232) is a ring-shaped member that is inserted into a sealing ring receiving groove (2006) formed on the inner circumference of the above-described through hole (2004).

[0081] The sealing bar (234) is a bar-shaped member that is inserted into a sealing bar receiving groove (2008) formed in the front wall (212) and rear wall (214) described above.

[0082] As previously explained, since the sealing bar receiving groove (2008) and the sealing ring receiving groove (2006) are connected, the sealing bar (234) and the sealing ring (232) of the sealing member (230) can also be connected to each other and manufactured as a single unit as shown in FIG. 5.

[0083] These sealing members (230) can be made of an elastic material, for example, rubber.

[0084] In an alternative example, a material with adhesive strength and fluidity, such as silicone, may be used as the sealing member (230). In this case, the sealing member (230) may be injected into the sealing ring receiving groove (2006) and the sealing bar receiving groove (2008) when assembling the power fuse.

[0085] A power fuse according to one embodiment of the present invention having the above configuration is assembled as follows.

[0086] First, the sealing ring (232) of the sealing member (230) is fitted into the inner side of the positioning holes of a pair of terminals (102) of the fuse element (100). Then, the fuse element (100) is coupled to the lower body (220) so that the positioning pins (2005) of the lower body (220) are inserted into the positioning holes (104) of the fuse element (100). Then, the lower portion of the sealing ring (232) of the sealing member (230) is inserted into the sealing ring receiving groove (2006) and the sealing bar receiving groove (2008) of the lower body (220) (Fig. 6).

[0087] Next, the upper body (210) is coupled to the fuse element (100) so that the positioning pins (2005) of the upper body (210) are inserted into the positioning holes (104) of the fuse element (100). Accordingly, the upper portion of the sealing ring (232) of the sealing member (230) and the sealing bar (234) are inserted into the sealing ring receiving groove (2006) and the sealing bar receiving groove (2008) of the lower body (220), respectively.

[0088] Then, the connection between the fuse element (100) and the fuse body (200) is completed by fastening the upper body (210) and the lower body (220) using a screw (2002).

[0089] The side walls (216, 226) of the fuse body (200) and the terminal (102) of the fuse element, that is, the through hole (2004) of the fuse body, are sealed by the sealing ring (232) of the sealing member (230), and the part where the upper body (210) and lower body (220) of the fuse body (200) interlock is sealed by the sealing ring (232) and the sealing bar (234). In particular, the sealing bar (234) is made to spread out sideways by being made close to the contact projection (2009) of the lower body (220) that protrudes into the sealing bar receiving groove (2008), and thus the sealing performance can be improved.

[0090] Additionally, since the positioning pins (2005) of the fuse body (200) are inserted into the positioning holes (104) of the fuse element (100), the fuse element (100) can be fixed without moving relative to the fuse body (200).

[0091] Once the combination of the fuse element (100) and the fuse body (200) is completed, an arc-extinguishing material, such as silica sand, is injected and filled into the internal space of the fuse body (200) through the arc-extinguishing material injection hole (240) of the upper body (210). When the injection of the arc-extinguishing material is completed, a plug (250) coated with adhesive is inserted into the large diameter portion of the arc-extinguishing material injection hole (240) and the plug (250) is fixed by adhering it to the upper body (210), or the plug (250) is inserted into the large diameter portion (242) of the arc-extinguishing material injection hole (240) and fixed by a method such as ultrasonic welding or laser welding.

[0092] The fuse body (200) of the power fuse of the present invention, configured as described above, can reduce manufacturing costs by using inexpensive and easy-to-process engineering plastic instead of expensive and difficult-to-process ceramic.

[0093] In addition, since the fuse body (200) made of an engineering plastic that is easy to process is easy to manufacture in a small size, the power fuse including the fuse body (200) of the present invention can be miniaturized.

[0094] In addition, the power fuse of the present invention includes a flat fuse element (100) in which a terminal (102) and a melting portion are arranged on the same plane together with a fuse body (200) manufactured using the engineering plastic described above, thereby reducing manufacturing costs and miniaturizing the size.

[0095] 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 fuse body for a power fuse coupled to a fuse element comprising a melting portion that melts due to an abnormal current and a pair of terminals disposed at both ends of said melting portion, Upper body; A lower body that engages with the upper body to define an internal space accommodating the melted portion of the fuse element; and A fuse body for a power fuse comprising a sealing member that seals the internal space from the outside.

2. In Paragraph 1, The upper body and the lower body each have a pair of side walls facing each other, and A fuse body for a power fuse in which the interlocking side walls of the upper body and lower body define a through hole formed with the same thickness and width as the thickness and width of the terminal of the fuse element.

3. In Paragraph 2, The interlocking side walls of the upper body and the lower body are provided with a sealing ring receiving groove formed by being recessed along the inner surface of the through hole, The above sealing member is a fuse body for a power fuse that includes a sealing ring inserted into the sealing ring receiving groove.

4. In Paragraph 1, The interlocking front walls and interlocking rear walls of the upper body and lower body each have a sealing bar receiving groove formed along the length direction of the walls, and The above sealing member is a fuse body for a power fuse comprising a sealing bar inserted into the sealing bar receiving groove.

5. In Paragraph 4, The sealing bar receiving groove is formed in the front wall and the rear wall of either the upper body or the lower body, and A fuse body for a power fuse, wherein a contact projection is formed on the front wall and rear wall of either the upper body or the lower body, protruding into the sealing bar receiving groove and adhering to the sealing bar.

6. In Paragraph 4, The above sealing bar receiving groove is in communication with the above sealing ring receiving groove, and The above sealing bar is a fuse body for a power fuse connected to the above sealing ring.

7. In Paragraph 2, A fuse body for a power fuse, wherein at least one or both of the upper body and the lower body each include at least one positioning pin extending in an upward and downward direction from the inner circumferential surface of the through hole.

8. In Paragraph 1, The upper body is provided with a hole for injecting an arc-extinguishing material into the internal space, and The above arc-refilling hole is a fuse body for a power fuse that is closed by a plug.

9. In Paragraph 8, The above plug is a fuse body for a power fuse that is joined to the upper body by adhesive, ultrasonic welding, or laser welding.

10. In Paragraph 1, The above upper body and lower body are fuse bodies for power fuses formed from engineering plastic.

11. Includes a fuse element and a fuse body, The above fuse element is, A cutting plate having a cutting portion having a cutting pattern formed thereon and a pair of terminal portions disposed on both sides of the cutting portion; and It includes a first terminal plate and a second terminal plate that are respectively coupled to the upper and lower sides of the terminal portion of the above-mentioned cutting plate and form a terminal of a fuse element together with the terminal portion, and The above fuse body is, An upper body in the shape of a cuboid with an open bottom; A lower body having a cuboidal shape with an open top surface and engaging with the upper body to define an internal space that accommodates the melting portion of the fuse element; and It includes a sealing member that seals the internal space from the outside, and The interlocking side walls of the upper body and lower body are provided with a through hole formed with a thickness and width equal to the thickness and width of the terminal of the fuse element, and a sealing ring receiving groove formed by being recessed along the inner surface of the through hole, and the interlocking front walls and rear walls of the upper body and lower body are provided with a sealing bar receiving groove formed along the length direction of each of the front wall and rear wall, respectively. The sealing member comprises a sealing ring inserted into the sealing ring receiving groove and a sealing bar inserted into the sealing bar receiving groove. The upper body includes an arc-extinguishing material filling hole for injecting an arc-extinguishing material into the internal space, and the arc-extinguishing material filling hole is closed by a stopper, and The upper body and lower body of the above-mentioned fuse body are formed of engineering plastic.

12. In Paragraph 11, The terminal of the above fuse element has at least one positioning hole formed in a portion corresponding to the through hole of the above fuse body, and A power fuse comprising at least one or both of the upper body and the lower body, each including at least one positioning pin extending in an upward and downward direction from the inner circumferential surface of the through hole.

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