A parallel fuse

Abstract

This utility model discloses a parallel fuse, including a fuse tube assembly and a closed conductive structure. The fuse tube assembly includes at least two fuse tubes arranged side by side; each fuse tube contains molten material, and both ends of the fuse tubes are closed. The fuse tubes are filled with an arc-extinguishing medium. At least one end of the fuse tube assembly is provided with a closed conductive structure; at one end of the fuse tube assembly with the closed conductive structure, the closed conductive structure closes the openings of all fuse tubes in the fuse tube assembly at that end. The closed conductive structure includes a conductive connecting piece, an arc-extinguishing gasket, a cover plate, and a terminal. At the end of the fuse tube assembly with the closed conductive structure: the conductive connecting piece covers the openings of all fuse tubes, and the conductive connecting piece has several first through holes. The molten material in the fuse tubes passes through the first through holes and is welded to the conductive connecting piece. The arc-extinguishing gasket is located on the side of the conductive connecting piece away from the fuse tubes and covers the first through holes. The cover plate is located on the side of the arc-extinguishing gasket away from the conductive connecting piece, and the cover plate is fixedly connected to all fuse tubes. The terminal is electrically connected to the conductive connecting piece.

Description

Technical Field

[0001] This utility model belongs to the field of fuse technology, and particularly relates to a parallel fuse. Background Technology

[0002] A fuse is a circuit protection device based on the principle of current thermal effect. When the current exceeds a specified value, the fuse element melts due to the heat generated by the fuse element itself to cut off the circuit, thereby protecting electrical equipment and lines from overload or short circuit damage.

[0003] The assembly sequence of a conventional fuse is as follows: the two ends of the fusible element are welded to the auxiliary terminals, then the welded parts (i.e., the fusible element and the auxiliary terminals welded together) are passed through the fuse tube, and then the connecting terminal is connected to the auxiliary terminal with bolts. The connecting terminal is fixed on the fuse tube and electrically connected to the external wire, so that the fuse is connected in series in the circuit.

[0004] In certain scenarios (such as high-voltage circuits), parallel fuses are sometimes used. The conventional structure of a parallel fuse is to place a conductive plate flat on the connecting terminals of all the fuses connected in parallel (specifically, auxiliary terminals and the conductive plate are located on either side of the connecting terminals), ensuring the conductive plate makes contact with the connecting terminals for conductivity. The conductive plate is then fixedly connected to all the fuses, and external wires are electrically connected to the conductive plate. Bolts are typically used to install the conductive plate, ensuring it is fixed in contact with the connecting terminals. However, due to differences in the torque of the multiple bolts and variations in the surface conditions of the connections (such as oil contamination), the contact resistance between the conductive plate and the connecting terminals can become exceptionally high, potentially even exceeding the resistance of the fuse itself. Utility Model Content

[0005] The purpose of this invention is to provide a parallel fuse to solve the problem of excessive contact resistance in existing parallel fuses.

[0006] The technical solution of this utility model is as follows:

[0007] A parallel fuse, comprising:

[0008] A molten tube assembly includes at least two molten tubes arranged side by side; each molten tube contains a molten substance, both ends of the molten tube are closed, and the molten tube is filled with an arc-extinguishing medium;

[0009] A closed conductive structure is provided at least one end of the fusible tube assembly; the closed conductive structure at one end of the fusible tube assembly closes the openings of all the fusible tubes in the fusible tube assembly at that end; the closed conductive structure includes a conductive connecting piece, an arc-proof gasket, a cover plate, and a terminal;

[0010] At one end of the fusion tube assembly with the closed conductive structure: the conductive connecting piece covers the openings of all fusion tubes, the conductive connecting piece has several first through holes, the molten material inside the fusion tube passes through the first through holes and is welded to the conductive connecting piece, the anti-arc gasket is located on the side of the conductive connecting piece away from the fusion tube and covers the first through holes, the cover plate is located on the side of the anti-arc gasket away from the conductive connecting piece, the cover plate is fixedly connected to all the fusion tubes, and the terminal is electrically connected to the conductive connecting piece.

[0011] Optionally, the closed conductive structure includes two arc-proof gaskets, namely a first gasket and a second gasket;

[0012] The first gasket is disposed on the side of the conductive connecting piece away from the molten tube, and the first gasket covers the first through hole. The second gasket is provided with a plurality of second through holes, and each molten tube communicates with at least one second through hole through the first through hole.

[0013] The second gasket is disposed on the side of the first gasket away from the conductive connecting piece, and the second gasket covers the second through hole; the cover plate is disposed on the side of the second gasket away from the first gasket.

[0014] Optionally, the first gasket is a barley paper gasket, and / or the second gasket is a silicone gasket.

[0015] Optionally, at one end of the fusible tube assembly where the closed conductive structure is provided: the fusible tube corresponds one-to-one with the anti-arc gasket.

[0016] Optionally, the cover plate is connected to all the fusion tubes via a mounting assembly, the cover plate being configured to press and fix the arc-proof gasket onto the conductive connecting piece and press the conductive connecting piece against the end face of the fusion tube.

[0017] Optionally, the mounting assembly includes a plurality of fasteners and a number of retaining rings corresponding to the number of the fusion tube;

[0018] The fixing ring is sleeved on the corresponding melting tube. The inner side of the fixing ring is provided with a first limiting surface facing the cover plate. The outer side wall of the melting tube is provided with a second limiting surface facing away from the cover plate. The first limiting surface abuts against the second limiting surface. A fixing plate is protruding from the outer side wall of the fixing ring. The fixing plate and the cover plate are fixedly connected by the fastener.

[0019] Optionally, in the mounting assembly, at least some of the fasteners pass through the cover plate, the conductive connecting piece, and the fixing plate and fasten them together, and at least zero of the fasteners pass through the conductive connecting piece and the fixing plate and fasten them together.

[0020] Optionally, the inner wall of the fixing ring is provided with an annular protrusion, and a portion of the surface of the annular protrusion forms the first limiting surface;

[0021] The outer wall of the fusion tube has an annular groove, a portion of which forms the second limiting surface; the annular protrusion is accommodated within the annular groove.

[0022] Optionally, the conductive connecting piece is welded to the terminal or integrally formed.

[0023] Optionally, the terminal is connected to the surface of the conductive connecting piece opposite to the fused tube, and the arc-proof pad and the cover plate are provided with notches for the terminal to pass through.

[0024] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0025] The parallel fuse provided by this utility model allows the fusible element inside the fuse tube to extend through the first through hole on the conductive connecting piece and be directly welded to the conductive connecting piece, thereby achieving electrical connection between the fusible element and the conductive connecting piece. This eliminates the contact resistance between the auxiliary terminal and the connecting terminal, as well as the contact resistance between the connecting terminal and the conductive plate, in the prior art, solving the problem of excessive contact resistance in existing parallel fuses. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] Figure 1 This is a schematic diagram of the structure of a parallel fuse according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a parallel fuse of the present invention after removing the cover plate at one end;

[0029] Figure 3 This is a schematic diagram of the structure of a parallel fuse of the present invention after removing the cover plate and the second gasket at one end;

[0030] Figure 4 This is a schematic diagram of the structure of a parallel fuse of the present invention after removing the cover plate, the second gasket and the first gasket at one end;

[0031] Figure 5 This is a cross-sectional schematic diagram of a parallel fuse according to the present invention;

[0032] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0033] Figure 7 This is a schematic diagram of a parallel fuse of the present invention after part of its structure has been cut off;

[0034] Figure 8 for Figure 7 A magnified view of a portion of the mid-section.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1: Fusion tube; 11: Annular groove; 111: Second limiting surface; 2: Fusion body; 3: Conductive connecting piece; 31: First through hole; 4: Terminal; 5: Cover plate; 51: Receiving groove; 6: Fixing ring; 61: Annular protrusion; 611: First limiting surface; 7: Fixing plate; 8: First gasket; 81: Second through hole; 9: Second gasket. Detailed Implementation

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0038] To keep the drawings concise, only the parts related to this utility model are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0039] In this document, the term "one" not only means "only one" but can also mean "more than one". The terms "first", "second", "third", etc., are used only for descriptive distinction and should not be interpreted as indicating or implying relative importance. The terms "perpendicular" and "parallel" do not indicate absolute perpendicularity or parallelism; they can be approximately perpendicular or approximately parallel.

[0040] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] See Figures 1 to 8 This embodiment provides a parallel fuse, including a fuse tube group and a closed conductive structure. The fuse tube group includes two fuse tubes 1 arranged side by side; in other embodiments, the fuse tube group may also include more than two fuse tubes 1, which is not limited here.

[0042] A fuse tube 1 contains a fusible element 2. The number of fusible elements 2 in each fuse tube 1 can be one or more, and the number is set according to the actual needs of the fuse. When multiple fusible elements 2 are present in a fuse tube 1, they are generally preferably evenly distributed circumferentially along the centerline of the fuse tube 1. However, depending on the actual needs of parallel fuses, in some cases, evenly distributing multiple fusible elements 2 along the centerline of the same fuse tube 1 may not be optimal, and adjustments can be made according to the actual situation. This invention does not limit the number or arrangement of fusible elements 2 in the fuse tube 1. In this embodiment, each fuse tube 1 contains four fusible elements 2, which are evenly distributed circumferentially along the centerline of the fuse tube 1.

[0043] The two ends of the fuse tube 1 are closed, and the fuse tube 1 is filled with an arc-extinguishing medium.

[0044] At least one end of the fusible tube assembly is provided with a closed conductive structure. At one end of the fusible tube assembly with the closed conductive structure, the closed conductive structure seals the openings of all fusible tubes 1 at that end; that is, the openings of the fusible tubes 1 at that end are sealed by the closed conductive structure. In this embodiment, both ends of the fusible tube assembly are provided with the closed conductive structure; in other embodiments, the fusible tube assembly may have a closed conductive structure at only one end.

[0045] The enclosed conductive structure includes a conductive connecting piece 3, an arc-proof gasket, a cover plate 5, and a terminal 4. The following section provides a detailed description of the enclosed conductive structure, taking one end of the fuse tube assembly and the enclosed conductive structure located at that end as an example.

[0046] The conductive connecting piece 3 covers the opening of the two fusible tubes 1 at this end. Specifically, the end faces of the two fusible tubes 1 at this end are located in the same plane, and the conductive connecting piece 3 is in close contact with the end faces of the two fusible tubes 1 at this end.

[0047] The conductive connecting piece 3 has several first through holes 31. The molten material 2 inside the molten tube 1 passes through the first through holes 31 and is welded to the conductive connecting piece 3. Specifically, the conductive connecting piece 3 has eight first through holes 31, with four first through holes 31 corresponding to each molten tube 1. The first through holes 31 correspond one-to-one with the molten material 2. The conductive connecting piece 3 has a first surface and a second surface arranged opposite to each other. The first surface of the conductive connecting piece 3 faces the inside of the molten tube 1. After passing through the corresponding first through hole 31, the molten material 2 is welded to the second surface of the conductive connecting piece 3. Preferably, after passing through the first through hole 31, the molten material 2 is bent to fit against the surface (i.e., the second surface) of the conductive connecting piece 3, and the molten material 2 fits against the side wall of the first through hole 31 when passing through the first through hole 31. The part of the inner wall of the first through hole 31 that fits against the molten material 2 is flat, and the molten material 2 is bent towards the centerline of the molten tube 1 after passing through the first through hole 31. Of course, in other embodiments, one first through hole 31 may correspond to two or more melts 2, that is, multiple melts 2 pass through the same first through hole 31.

[0048] An anti-arc gasket is disposed on the side of the conductive connecting piece 3 away from the fused tube 1 and covers the first through hole 31; moreover, the anti-arc gasket corresponds one-to-one with the fused tube 1. Of course, in other embodiments, multiple fused tubes 1 may correspond to one anti-arc gasket, which is not limited here. Specifically, in this embodiment, the closed conductive structure includes two anti-arc gaskets, namely the first gasket 8 and the second gasket 9.

[0049] The first gasket 8 is disposed on the side of the conductive connecting piece 3 facing away from the molten tube 1, and the first gasket 8 covers the first through hole 31; the second gasket 9 is provided with a plurality of second through holes 81, and each molten tube 1 is connected to at least one second through hole 81 through the first through hole 31. Specifically, the first gasket 8 is attached to the conductive connecting piece 3, and the first gasket 8 covers the four first through holes 31 on the conductive connecting piece 3 corresponding to the molten tube 1. At the same time, each first through hole 31 is connected to a second through hole 81. Of course, in other embodiments, there may be multiple second through holes 81 on the first gasket that are connected to the same first through hole 31 on the conductive connecting piece 3, or all the first through holes 31 on the conductive connecting piece 3 may be covered by the first gasket without any second through holes 81 connecting to them, etc. This utility model does not limit this.

[0050] The second gasket 9 is located on the side of the first gasket 8 away from the conductive connecting piece 3. The second gasket 9 covers the second through hole 81. Specifically, the second gasket 9 is attached to the first gasket 8, and the second gasket 9 closes all the second through holes 81 on the first gasket 8.

[0051] Preferably, in this embodiment, the first gasket 8 can be a barley paper gasket made of barley paper, and the second gasket 9 can be a silicone gasket made of silicone.

[0052] A cover plate 5 is located on the side of the second gasket 9 facing away from the first gasket 8. The cover plate 5 is connected to all the fusion tubes 1 via a mounting assembly. The cover plate 5 is configured to press and fix the arc-proof gasket onto the conductive connecting piece 3 and press the conductive connecting piece 3 onto the end face of the fusion tube 1. Specifically, the cover plate 5 has a receiving groove 51 on the side facing the fusion tube 1. The second gasket 9 and the first gasket 8 are received in the receiving groove 51. The area of ​​the cover plate 5 outside the receiving groove 51 is in contact with the conductive connecting piece 3. The depth of the receiving groove 51 is slightly less than the sum of the thicknesses of the second gasket 9 and the first gasket 8 (the difference is about 0.03 mm) so that the cover plate 5 can press the second gasket 9 onto the first gasket 8 and press the first gasket 8 onto the conductive connecting piece 3.

[0053] The mounting assembly includes several fasteners and a number of retaining rings 6 corresponding to the number of fuse tubes 1. Each retaining ring 6 is fitted onto a corresponding fuse tube 1. The inner side of each retaining ring 6 has a first limiting surface 611 facing the cover plate 5, and the outer side wall of each fuse tube 1 has a second limiting surface 111 facing away from the cover plate 5. The first limiting surface 611 abuts against the second limiting surface 111. A retaining plate 7 protrudes from the outer side wall of each retaining ring 6, and the retaining plate 7 is fixedly connected to the cover plate 5 by fasteners. Thus, the abutment of the first limiting surface 611 and the second limiting surface 111, along with the fixed connection between the cover plate 5 and the retaining plate 7, achieves a fixed connection between the fuse tube 1 and the cover plate 5. Since both fuse tubes 1 are fixedly connected to the same cover plate 5, the relative positions of the two fuse tubes 1 in the parallel fuse of this embodiment are also fixed. The fasteners can be screws or similar materials; no specific limitations are imposed.

[0054] Furthermore, in the mounting assembly, some fasteners pass through the cover plate 5, the conductive connecting piece 3, and the fixing plate 7 and are fastened to them, while other fasteners pass through the conductive connecting piece 3 and the fixing plate 7 and are fastened to them. Thus, the conductive connecting piece 3 is fixed to the end face of the fusion tube 1 not only by being pressed by the cover plate 5, but also by the fasteners. Of course, in other embodiments, all fasteners in the mounting assembly may pass through the cover plate 5, the conductive connecting piece 3, and the fixing plate 7 and be fastened to them, i.e., there may be no fasteners that pass through the conductive connecting piece 3 and the fixing plate 7 and are fastened to them.

[0055] Specifically, such as Figure 8As shown, the inner wall of the fixing ring 6 is provided with an annular protrusion 61, and a portion of the surface of the annular protrusion 61 forms a first limiting surface 611; the outer wall of the melting tube 1 is provided with an annular groove 11, and a portion of the annular groove 11 forms a second limiting surface 111; the annular protrusion 61 is accommodated within the annular groove 11. The annular protrusion on the fixing ring 6 can be formed by the fixing ring 6's own elasticity passing through the portion of the melting tube 1 without the annular groove 11 before reaching and engaging with the corresponding annular groove 11; or the fixing ring 6 can be formed by two semi-circular rings fastened into the annular groove 11 on the melting tube 1 and then connected together by welding or other methods; or other methods may be used, which are not limited here.

[0056] More specifically, in this embodiment, the fixing ring 6 is an integral piece, and the annular protrusion 61 on the fixing ring 6 reaches and gets into the annular groove 11 on the molten tube 1 through its own elasticity. The fixing ring 6 and the fixing plate 7 are integrally made.

[0057] Terminal 4 is electrically connected to conductive connecting piece 3. Terminal 4 is used for electrical connection with external components, which are generally wires, so terminal 4 is generally called a terminal block; of course, the external component can also be other conductive components besides the wire, such as conductive metal sheets.

[0058] The conductive connecting piece 3 is welded to the terminal 4 or integrally formed. Preferably, when the conductive connecting piece 3 and the terminal 4 are made of the same material, the conductive connecting piece 3 and the terminal 4 are integrally formed to achieve electrical connection between them; when the conductive connecting piece 3 and the terminal 4 are made of different materials, the conductive connecting piece 3 and the terminal 4 are welded to achieve electrical connection.

[0059] Terminal 4 can be connected to the side of the conductive connecting piece 3, the second surface of the conductive connecting piece 3, or other locations on the conductive connecting piece 3. The connection position of terminal 4 on the conductive connecting piece 3 is not limited. In this embodiment, as... Figure 4 As shown, terminal 4 is connected to the second surface of conductive connecting piece 3. The first gasket 8, the second gasket 9, and the cover plate 5 are provided with notches for terminal 4 to pass through, so that terminal 4 can be exposed outside the cover plate 5.

[0060] The assembly method of the parallel fuse provided in this embodiment (it should be noted that the assembly method provided here is only an example and not a limitation of this utility model) can be as follows: First, assemble the closed conductive structure at one end of the fuse tube group. Specifically, install two fixing rings 6 onto two fuse tubes 1, then pass one end of each of the fusible elements 2 through the first through hole 31 on the conductive connecting piece 3, and then weld the fusible elements 2 and the conductive connecting piece 3. Then, position the conductive connecting piece 3 at one end of the two fuse tubes 1 and allow the fusible elements 2 to enter the corresponding fuse tubes 1. Fix the conductive connecting piece 3 to the fixing plate 7, and then place the second gasket 9 and the first gasket 8 into the corresponding receiving positions on the cover plate 5. Inside the groove 51, the fixing plate 7 and the conductive connecting piece 3 are positioned on the cover plate 5. Fasteners are inserted through the cover plate 5, the conductive connecting piece 3, and the fixing plate 7, and the three are fastened. Then, the closed conductive structure at the other end of the fusion tube assembly is assembled. Specifically, the two fixing rings 6 are installed on the two fusion tubes 1 respectively, and the conductive connecting piece 3 is positioned on the end face of the two fusion tubes 1 (the first through hole 31 on the conductive connecting piece 3 passes through the corresponding fusion body 2). The fusion body 2 is bent and welded. Then, the arc extinguishing medium is filled into the fusion tube 1 through the first through hole 31 on the conductive connecting piece 3. Then, the first gasket 8, the second gasket 9, and the cover plate 5 are placed on top. Finally, the cover plate 5, the conductive connecting piece 3, and the fixing plate 7 are fixed with fasteners.

[0061] In the parallel fuse provided in this embodiment, the fusible element 2 inside the fuse tube 1 can extend out of the fuse tube 1 through the first through hole 31 on the conductive connecting piece 3 and be directly welded to the conductive connecting piece 3, thereby realizing the electrical connection between the fusible element 2 and the conductive connecting piece 3. Therefore, the contact resistance between the auxiliary terminal and the connecting terminal, as well as the contact resistance between the connecting terminal and the conductive plate, is eliminated in the prior art, solving the problem of excessive contact resistance in the parallel fuses of the prior art.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A parallel fuse, characterized in that, include: A molten tube assembly includes at least two molten tubes arranged side by side; each molten tube contains a molten substance, both ends of the molten tube are closed, and the molten tube is filled with an arc-extinguishing medium; A closed conductive structure is provided at least one end of the fusible tube assembly; the closed conductive structure at one end of the fusible tube assembly closes the openings of all the fusible tubes in the fusible tube assembly at that end; the closed conductive structure includes a conductive connecting piece, an arc-proof gasket, a cover plate, and a terminal; At one end of the fusion tube assembly with the closed conductive structure: the conductive connecting piece covers the openings of all fusion tubes, the conductive connecting piece has several first through holes, the molten material inside the fusion tube passes through the first through holes and is welded to the conductive connecting piece, the anti-arc gasket is located on the side of the conductive connecting piece away from the fusion tube and covers the first through holes, the cover plate is located on the side of the anti-arc gasket away from the conductive connecting piece, the cover plate is fixedly connected to all the fusion tubes, and the terminal is electrically connected to the conductive connecting piece.

2. The parallel fuse according to claim 1, characterized in that, The closed conductive structure includes two anti-arc pads, namely the first pad and the second pad; The first gasket is disposed on the side of the conductive connecting piece away from the molten tube, and the first gasket covers the first through hole. The second gasket is provided with a plurality of second through holes, and each molten tube communicates with at least one second through hole through the first through hole. The second gasket is disposed on the side of the first gasket away from the conductive connecting piece, and the second gasket covers the second through hole; the cover plate is disposed on the side of the second gasket away from the first gasket.

3. The parallel fuse according to claim 2, characterized in that, The first gasket is a barley paper gasket, and / or the second gasket is a silicone gasket.

4. The parallel fuse according to claim 1, characterized in that, At one end of the fused tube assembly, where the closed conductive structure is provided: the fused tube corresponds one-to-one with the anti-arc gasket.

5. The parallel fuse according to claim 1, characterized in that, The cover plate is connected to all the fusion tubes via a mounting assembly. The cover plate is configured to press and fix the arc-proof gasket onto the conductive connecting piece and press the conductive connecting piece against the end face of the fusion tube.

6. The parallel fuse according to claim 5, characterized in that, The mounting assembly includes a number of fasteners and a number of retaining rings corresponding to the number of the fusion tube; The fixing ring is sleeved on the corresponding melting tube. The inner side of the fixing ring is provided with a first limiting surface facing the cover plate. The outer side wall of the melting tube is provided with a second limiting surface facing away from the cover plate. The first limiting surface abuts against the second limiting surface. A fixing plate is protruding from the outer side wall of the fixing ring. The fixing plate and the cover plate are fixedly connected by the fastener.

7. The parallel fuse according to claim 6, characterized in that, In the mounting assembly, at least some of the fasteners pass through the cover plate, the conductive connecting piece, and the fixing plate and fasten them together, and at least zero of the fasteners pass through the conductive connecting piece and the fixing plate and fasten them together.

8. The parallel fuse according to claim 6, characterized in that, The inner wall of the fixing ring is provided with an annular protrusion, and a portion of the surface of the annular protrusion forms the first limiting surface; The outer wall of the fusion tube has an annular groove, a portion of which forms the second limiting surface; the annular protrusion is accommodated within the annular groove.

9. The parallel fuse according to claim 1, characterized in that, The conductive connecting piece is welded to the terminal or integrally formed.

10. The parallel fuse according to claim 1, characterized in that, The terminal is connected to the surface of the conductive connecting piece opposite to the fused tube, and the arc-proof gasket and the cover plate are provided with notches for the terminal to pass through.

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