A pluggable fuse

Abstract

The application relates to the technical field of fuses, and discloses a pluggable fuse, which comprises a ceramic base, a tapered clamping groove is formed in the middle of the upper end of the ceramic base, a wire inlet terminal is arranged in the wire connection groove near one end of the wire inlet hole, a wire outlet terminal is arranged in the wire connection groove near one end of the wire outlet hole, a fuse body is connected between the wire inlet U-shaped conductive sheet and the wire outlet U-shaped conductive sheet, and an abnormality alarm mechanism is embeddedly arranged on the inner side of the ceramic cover near the wire outlet U-shaped conductive sheet. The ceramic cover is covered on the ceramic base, the ceramic tapered clamping base is inserted into the tapered clamping groove, the wire inlet U-shaped conductive sheet is inserted into the wire inlet terminal, the wire outlet U-shaped conductive sheet is inserted into the wire outlet terminal, and the installation of the fuse is completed; when the fuse body is fused, the ceramic cover is directly pulled out of the ceramic base, the fuse body is detached from the wire inlet U-shaped conductive sheet and the wire outlet U-shaped conductive sheet, and a new fuse body can be replaced, so that the replacement is convenient and simple.

Description

Technical Field

[0001] This invention relates to the field of fuse technology, specifically a pluggable fuse. Background Technology

[0002] A fuse is an electrical device that uses a fusible metal element connected in series in a circuit to interrupt overload or short-circuit current. Its working principle is based on the heating and melting characteristics of the fusible element. Once the current exceeds a set value, the fusible element will break due to its own heating, thus protecting the circuit from damage. Among them, plug-in fuses can have the characteristic of quick replacement. This type of fuse is designed to quickly disconnect the faulty part in the circuit when an overload or short circuit occurs, thereby protecting other equipment in the circuit from damage.

[0003] Chinese patent discloses an insert-type fuse (publication number CN212461593U). This patented technology includes a base and a plug-in that cooperates with the base. The upper surface of the base has two first locking threaded holes, and a first locking bolt is threaded inside the first locking threaded hole. A first connecting hole for external wires is opened on the side of the first locking bolt. Through holes for external wires to pass through are opened on the left and right side walls of the base. Dust covers are fixed to the left and right side walls of the base by screws. A second locking threaded hole is opened on the upper surface of the plug-in corresponding to the position of the first locking bolt. A second locking bolt is threaded inside the second locking threaded hole. A second connecting hole for connecting the fusible element is opened on the side of the second locking bolt. A lap copper sheet is fixed to the upper surface of the plug-in by the second locking bolt. This provides an insert-type fuse with a simple structure, quick fusible element replacement, and less prone to dust accumulation.

[0004] However, its sensitivity is poor, and it may not be able to effectively disconnect the circuit in the event of overload or short circuit; and it cannot provide an alarm in case of abnormality. Summary of the Invention

[0005] The purpose of this invention is to provide a pluggable fuse to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pluggable fuse includes a ceramic base and a ceramic cover that matches the ceramic base. A conical groove is formed in the middle of the upper end of the ceramic base, and wiring grooves are formed at both ends of the upper end of the ceramic base near the conical groove. An inlet hole is formed at one end of the ceramic base, and an outlet hole is formed at the other end. An inlet terminal is installed in the wiring groove near the inlet hole, and an outlet terminal is installed in the wiring groove near the outlet hole. A ceramic conical bracket is fixedly connected to the middle of the lower end of the ceramic cover. An inlet U-shaped conductive piece is installed at the lower end of the ceramic cover near the ceramic conical bracket, and an outlet U-shaped conductive piece is installed at the other end of the lower end of the ceramic cover near the ceramic conical bracket. A fuse element is connected between the inlet and outlet U-shaped conductive pieces. An abnormal alarm mechanism is embedded in the inner side of the ceramic cover near the outlet U-shaped conductive piece.

[0008] As a further embodiment of the present invention: rubber posts are installed at both the front and rear ends of the ceramic conical card holder, and card slots matching the rubber posts are opened at both the front and rear ends of the inner sidewall of the conical card groove.

[0009] As a further embodiment of the present invention: the fuse includes a ceramic fuse tube, one end of which is embedded with a bent conductive sheet two, and the other end of which is embedded with a bent conductive sheet one. The upper ends of both the bent conductive sheet two and the bent conductive sheet one are fixedly connected to a contact inside the ceramic fuse tube. A fuse is electrically connected between the two contacts. A fuse is provided in the middle of the fuse. Arc-extinguishing grids are provided inside the ceramic fuse tube at both the front and rear ends of the fuse.

[0010] As a further embodiment of the present invention: a rupture cylinder is provided at the lower end of the ceramic melting tube near the melting point, and a filter cylinder is provided at the upper end of the ceramic melting tube near the melting point. The filter cylinder is filled with insulating cotton, and several vent holes are provided at the upper end of the ceramic melting tube near the filter cylinder.

[0011] As a further embodiment of the present invention: the second bent conductive sheet and the first bent conductive sheet are electrically connected to the inlet U-shaped conductive sheet and the outlet U-shaped conductive sheet, respectively; the ceramic conical holder has an opening groove in the middle; and the ceramic fusion tube is embedded in the inner side of the opening groove.

[0012] As a further embodiment of the present invention: the incoming terminal block includes a terminal block body, a U-shaped conductive frame is fixedly connected to the inner side of the terminal block body, a set of V-shaped conductive grooves are formed at the junction of the terminal block body and the U-shaped conductive frame, and a wire fastening mechanism is installed through the inner side of the U-shaped conductive frame.

[0013] As a further embodiment of the present invention: the wire fastening mechanism includes a threaded inner cylinder fixed to the inner side of the U-shaped conductive frame by a set of connecting pieces. A set of insertion holes are provided radially on the outer side of the threaded inner cylinder, and a threaded outer cylinder is axially engaged with the inner side of the threaded inner cylinder. A threaded rod is fixedly connected to the upper end of the threaded outer cylinder, and a rotating cylinder is rotatably connected to the lower end of the threaded outer cylinder. Several bayonets are provided at the lower end of the rotating cylinder, and a nut is fixedly connected to the upper end of the threaded rod.

[0014] As a further embodiment of the present invention: the abnormal alarm mechanism includes a warning light slidably connected to the inside of the ceramic cover, and an electromagnet fixed to the inside of the ceramic cover and located below the warning light. One end of the warning light is electrically connected to a rigid conductive strip, and the other end of the warning light is electrically connected to a battery holder via a flexible wire. A button battery is installed inside the battery holder. An iron plate is fixedly connected to the bottom of the warning light, and an elastic plate is fixedly connected to the upper end of the electromagnet. The elastic plate is supported on the bottom of the iron plate.

[0015] As a further embodiment of the present invention: the lower end of the electromagnet is connected to wire 2 and wire 1 respectively; wire 1 is provided on the inner side of the ceramic cover near the electromagnet; wire 2 is provided on the inner side of the ceramic base near one of the wiring slots; wire 2 passes through the inner sides of wire 1 and wire 2 in sequence and is electrically connected to the neutral wire of the external circuit; and wire 1 is electrically connected to the U-shaped conductive sheet of the outgoing wire.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention completes the installation of the fuse by placing a ceramic cover on a ceramic base, inserting a ceramic conical holder into a conical slot, inserting an inlet U-shaped conductive piece into an inlet terminal block, and inserting an outlet U-shaped conductive piece into an outlet terminal block. When the fuse blows, the ceramic cover can be directly removed from the ceramic base, the fuse can be removed from the inlet and outlet U-shaped conductive pieces, and a new fuse can be replaced. It is convenient and simple.

[0018] By incorporating a fusing element and an explosion-proof cylinder into the fuse body, the fuse body can be precisely and quickly melted in the event of overload or short circuit, thereby improving sensitivity and achieving rapid response. The arc-extinguishing grid extinguishes the instantaneous strong electric arc generated by the fuse body during melting, preventing the electric arc from damaging the ceramic fuse tube and improving safety.

[0019] By enabling the warning light in the abnormal alarm mechanism to pop up from inside the ceramic cover and emit light to provide an early warning when there is an overload or short circuit, and to retract into the ceramic cover and turn off when the external circuit is normally open, the functionality of the fuse is improved. Attached Figure Description

[0020] Figure 1 This is an exploded view of a pluggable fuse.

[0021] Figure 2 This is a top view of the ceramic cover in a pluggable fuse.

[0022] Figure 3 This is a partial cross-sectional view of the ceramic base in a pluggable fuse.

[0023] Figure 4 This is a schematic diagram of the structure of the fuse element in a pluggable fuse;

[0024] Figure 5 This is a partial cross-sectional view of the fuse element in a pluggable fuse.

[0025] Figure 6 for Figure 5 A magnified structural diagram of part A in the middle;

[0026] Figure 7 This is a schematic diagram of the incoming terminal block in a pluggable fuse;

[0027] Figure 8 This is an exploded structural diagram of the wire fastening mechanism in a pluggable fuse.

[0028] Figure 9 This is a cross-sectional schematic diagram of an abnormal alarm mechanism in a pluggable fuse.

[0029] In the diagram: 1. Ceramic base; 2. Ceramic cover; 3. Ceramic conical holder; 4. Inlet U-shaped conductive sheet; 5. Inlet hole; 6. Wiring groove; 7. Conical groove; 8. Outlet hole; 9. Outlet U-shaped conductive sheet; 10. Fuse; 101. Ceramic fuse tube; 102. Bent conductive sheet one; 103. Bent conductive sheet two; 104. Vent hole; 105. Contact; 106. Fuse; 107. Arc extinguishing grid; 108. Fuse section; 109. Explosion tube; 110. Filter cylinder; 111. Insulating cotton; 11. Opening groove; 12. Abnormal alarm mechanism; 121. Warning light; 122. Iron sheet; 123. Flexible wire; 124. 125. Battery holder; 126. Button battery; 127. Hard conductive strip; 128. Wire 1; 129. Electromagnet; 120. Elastic sheet; 121. Wire 2; 13. Rubber retainer; 14. Wire hole 1; 15. Inlet terminal block; 151. Terminal block body; 152. V-shaped conductive groove; 153. U-shaped conductive frame; 154. Wire fastening mechanism; 1541. Threaded inner cylinder; 1542. Insertion hole; 1543. Connecting piece; 1544. Rotating cylinder; 1545. Bayonet; 1546. Threaded outer cylinder; 1547. Threaded rod; 1548. Nut; 16. Slot; 17. Outlet terminal block; 18. Wire hole 2. Detailed Implementation

[0030] Example 1

[0031] Please see Figures 1-8 In this embodiment of the invention, a pluggable fuse includes a ceramic base 1 and a ceramic cover 2 that matches the ceramic base 1. A conical groove 7 is formed in the middle of the upper end of the ceramic base 1, and wiring grooves 6 are formed at both ends of the upper end of the ceramic base 1 near the conical groove 7. An inlet hole 5 is formed at one end of the ceramic base 1, and an outlet hole 8 is formed at the other end. An inlet terminal 15 is installed in the wiring groove 6 near the inlet hole 5, and an outlet terminal 17 is installed in the wiring groove 6 near the outlet hole 8. A ceramic conical retainer 3 is fixedly connected to the middle of the lower end of the ceramic cover 2, and a ceramic cover 2 is installed near the ceramic conical retainer 3. The ceramic cover 2 is equipped with an inlet U-shaped conductive sheet 4, and an outlet U-shaped conductive sheet 9 is installed at the other end of the ceramic cover 2 near the ceramic conical base 3. A fuse 10 is connected between the inlet U-shaped conductive sheet 4 and the outlet U-shaped conductive sheet 9. An abnormal alarm mechanism 12 is embedded in the inner side of the ceramic cover 2 near the outlet U-shaped conductive sheet 9. Rubber pins 13 are installed at both the front and rear ends of the ceramic conical base 3. The front and rear ends of the inner side wall of the conical slot 7 are provided with slots 16 that match the rubber pins 13. When the ceramic conical base 3 is inserted into the conical slot 7, the rubber pins 13 are embedded into the corresponding slots 16, so that the ceramic base 1 and the ceramic cover 2 can be securely installed together to prevent them from falling off.

[0032] Insert the input lead wire into the wiring slot 6 through the inlet hole 5 and fix it to the inlet terminal block 15; then insert the output lead wire into the wiring slot 6 near the outlet hole 8 through the outlet hole 8 and fix it to the outlet terminal block 17; when the ceramic cover 2 is placed on the ceramic base 1, wherein the ceramic conical retainer 3 is inserted into the conical retainer 7, the inlet U-shaped conductive piece 4 is inserted into the inlet terminal block 15, and the outlet U-shaped conductive piece 9 is inserted into the outlet terminal block 17, the fuse installation is completed. At this time, the input lead wire, the inlet terminal block 15, the inlet U-shaped conductive piece 4, the fuse 10, the outlet U-shaped conductive piece 9, the outlet terminal block 17, and the output lead wire form a circuit; when an overload or short circuit occurs, the fuse 10 melts, and the external circuit is broken.

[0033] like Figure 4 , Figure 5 and Figure 6As shown, the fuse 10 includes a ceramic fuse tube 101. A bent conductive strip 2 103 is embedded at one end of the ceramic fuse tube 101, and a bent conductive strip 102 is embedded at the other end of the ceramic fuse tube 101. A contact 105 is fixedly connected to the upper ends of both the bent conductive strip 2 103 and the bent conductive strip 102 inside the ceramic fuse tube 101. A fuse 106 is electrically connected between the two contacts 105. A fuse portion 108 is provided in the middle of the fuse 106. Arc-extinguishing grids 1 are provided at both the front and rear ends of the fuse 106 inside the ceramic fuse tube 101. 07. The arc-extinguishing grid 107 extinguishes the instantaneous strong arc generated when the fuse 10 melts, preventing the arc from damaging the ceramic fuse tube 101. In case of overload or short circuit, the fuse 106 melts at the fuse section 108. At this time, the live wire is in an open circuit state. The ceramic cover 2 can be directly pulled out from the ceramic base 1, and the fuse 10 can be removed from the inlet U-shaped conductive sheet 4 and the outlet U-shaped conductive sheet 9. A new fuse 10 can be replaced. A rupture cylinder 109 is provided inside the ceramic fuse tube 101 near the lower end of the fuse section 108. A filter cylinder 110 is installed at the upper end of the part near the fuse section 108. The filter cylinder 110 is filled with insulating cotton 111. Several vent holes 104 are opened at the upper end of the ceramic fusion tube 101 near the filter cylinder 110. The blasting tube 109 is filled with gunpowder that detonates at a certain temperature, such as lead azide, dinitrodiazophenol, and aluminum trinitroresorcinol. When an overload or short circuit occurs, a large amount of heat will be generated, and the temperature will rise rapidly. If the fuse section 108 is not completely melted and is still in a conductive state, the gunpowder in the blasting tube 109 will detonate under the action of high temperature, thus detonating the explosive. The fuse at point 108 breaks off, breaking the circuit, improving sensitivity, and enabling rapid response. The smoke generated after the gunpowder detonates is filtered by insulating cotton 111 and discharged through vent 104, improving safety. The bent conductive sheet 2 103 and bent conductive sheet 102 are electrically connected to the inlet U-shaped conductive sheet 4 and the outlet U-shaped conductive sheet 9, respectively. The ceramic conical holder 3 has an opening groove 11 in the middle, and the ceramic fusion tube 101 is embedded in the inner side of the opening groove 11, so that the ceramic fusion tube 101 can be placed into the inside of the conical holder 7 to ensure insulation from the outside.

[0034] like Figure 3 and Figure 7As shown, the inlet terminal block 15 includes a terminal block body 151. A U-shaped conductive frame 153 is fixedly connected to the inner side of the terminal block body 151. A set of V-shaped conductive grooves 152 are formed at the junction of the terminal block body 151 and the U-shaped conductive frame 153. A wire fastening mechanism 154 is installed through the inner side of the U-shaped conductive frame 153. The terminal block body 151 is fixed in the corresponding wire groove 6 by screws. The outlet terminal block 17 has the same structure as the inlet terminal block 15. When the ceramic cover 2 is placed on the ceramic base 1, the inlet U-shaped conductive piece 4 is stuck in the set of V-shaped conductive grooves 152. The fuse 10 can be electrically connected to the inlet terminal block 15 and the outlet terminal block 17 through the inlet U-shaped conductive piece 4.

[0035] like Figure 7 and Figure 8 As shown, the wire fastening mechanism 154 includes a threaded inner cylinder 1541 fixed to the inner side of the U-shaped conductive frame 153 by a set of connecting pieces 1543. A set of insertion holes 1542 are radially provided on the outer side of the threaded inner cylinder 1541. An axially engaged threaded outer cylinder 1546 is connected to the inner side of the threaded inner cylinder 1541. A threaded rod 1547 is fixedly connected to the upper end of the threaded outer cylinder 1546, and a rotating cylinder 1544 is rotatably connected to the lower end of the threaded outer cylinder 1546. Several bayonets 1545 are provided at the lower end of the rotating cylinder 1544. A nut 1548 is fixedly connected to the upper end of the threaded rod 1547, which is engaged through the upper part of the U-shaped conductive frame 153. First, strip the insulation from the end of the input wire to expose the bare end. Then, insert the bare end into the threaded inner cylinder 1541 through the insertion hole 1542. Next, rotate the nut 1548, which drives the threaded rod 1547 and the threaded outer cylinder 1546 to rotate together. The threaded outer cylinder 1546 rotates inside the threaded inner cylinder 1541 and drives the rotating cylinder 1544 to move downward. The exposed end of the input wire is locked into the threaded inner cylinder 1541 through the bayonet 1545, thus securing the input wire securely in the inlet terminal block 15 and preventing it from falling off. Similarly, the output wire can be securely fixed to the outlet terminal block 17.

[0036] Example 2

[0037] Please see Figure 3 and 9The abnormal alarm mechanism 12 includes a warning light 121 slidably connected to the inside of the ceramic cover 2, and an electromagnet 128 fixed to the inside of the ceramic cover 2 and located below the warning light 121. One end of the warning light 121 is electrically connected to a rigid conductive strip 126, and the other end of the warning light 121 is electrically connected to a battery holder 124 via a flexible wire 123. A button battery 125 is installed inside the battery holder 124. An iron plate 122 is fixedly connected to the bottom of the warning light 121, and an elastic plate 129 is fixedly connected to the upper end of the electromagnet 128. 29 is supported at the bottom of the iron plate 122. When the electromagnet 128 is de-energized, the electromagnet 128 loses its attraction to the iron plate 122; the elastic plate 129 resets, pushing the iron plate 122 and the warning light 121 upwards together, causing the warning light 121 to pop out from the inside of the ceramic cover 2. As the warning light 121 moves upwards, it drives the rigid conductive strip 126 upwards as well, so that the rigid conductive strip 126 connects with the button battery 125; at this time, a connection is formed between the warning light 121, the flexible wire 123, the button battery 125, and the rigid conductive strip 126. A circuit is formed; the warning light 121 emits light for early warning; the lower end of the electromagnet 128 is connected to wire 2 120 and wire 127 respectively; a wire hole 14 is opened on the inner side of the ceramic cover 2 near the electromagnet 128; a wire hole 2 18 is opened on the inner side of the ceramic base 1 near one of the wiring slots 6; wire 2 120 passes through the inner side of wire hole 14 and wire hole 2 18 in sequence and is electrically connected to the neutral wire of the external circuit; wire 127 is electrically connected to the U-shaped conductive piece 9, thereby connecting the electromagnet 128 to the external circuit. In the circuit state, the electromagnet 128 operates normally, generating magnetic attraction to hold the iron sheet 122 and press the elastic sheet 129. The iron sheet 122 holds the warning light 121 inside the ceramic cover 2. At this time, the button battery 125 is separated from the hard conductive strip 126, and the warning light 121 is in the power-off state. When an external circuit is overloaded or short-circuited, the fuse 10 melts, and the electromagnet 128 is in the open circuit state. The electromagnet 128 is automatically de-energized, and the warning light 121 extends out from inside the ceramic cover 2 and is in the circuit state.

[0038] The working principle of this invention is as follows: When the fuse needs to be installed on the live wire of an external circuit, firstly, the end of the live wire's input conductor is stripped to expose the bare end; then, the bare end is inserted into the wiring slot 6 through the inlet hole 5, and then sequentially inserted into the threaded inner cylinder 1541 through the insertion hole 1542; next, the nut 1548 is rotated, which drives the threaded rod 1547 and the threaded outer cylinder 1546 to rotate together. The threaded outer cylinder 1546 rotates inside the threaded inner cylinder 1541, and drives the rotating cylinder 1544 to move downward. The exposed end of the input conductor is locked in the threaded inner cylinder 1541 through the bayonet 1545, thereby securely fixing the input conductor in the inlet terminal block 15; similarly, the output conductor of the live wire is inserted into the corresponding wiring slot 6 through the outlet hole 8 and fixed on the outlet terminal block 17;

[0039] Then, the ceramic cover 2 is placed on the ceramic base 1, wherein the ceramic conical holder 3 is inserted into the conical slot 7, the rubber pin 13 is embedded in the slot 16, the inlet U-shaped conductive piece 4 is inserted into the inlet terminal block 15, and the outlet U-shaped conductive piece 9 is inserted into the outlet terminal block 17, thus completing the installation of the fuse. At this time, the current-leading input wire, the inlet terminal block 15, the inlet U-shaped conductive piece 4, the fuse 10, the outlet U-shaped conductive piece 9, the outlet terminal block 17, and the current-leading output wire form a circuit;

[0040] When an overload or short circuit occurs, the fuse 106 inside the fuse body 10 generates a large amount of heat and melts at the fuse part 108. If the fuse part 108 is not completely melted and remains conductive, the gunpowder inside the blasting tube 109 detonates under high temperature, breaking the fuse part 108 and achieving circuit breaking.

[0041] At this point, the live wire is in an open circuit state. Simply pull out the ceramic cover 2 from the ceramic base 1, remove the fuse 10 from the inlet U-shaped conductive sheet 4 and the outlet U-shaped conductive sheet 9, and replace it with a new fuse 10.

[0042] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pluggable fuse, comprising a ceramic base (1) and a ceramic cover (2) mating with the ceramic base (1), characterized in that, A conical groove (7) is provided in the middle of the upper end of the ceramic base (1), and wiring grooves (6) are provided at both ends of the upper end of the ceramic base (1) near the conical groove (7). An inlet hole (5) is provided at one end of the ceramic base (1), and an outlet hole (8) is provided at the other end of the ceramic base (1). An inlet terminal block (15) is installed in the wiring groove (6) near the inlet hole (5), and an outlet terminal block (17) is installed in the wiring groove (6) near the outlet hole (8). The ceramic cover (2) A ceramic conical bracket (3) is fixedly connected to the middle of the lower end of the ceramic cover (2). An inlet U-shaped conductive sheet (4) is installed at the lower end of the ceramic cover (2) near the ceramic conical bracket (3), and an outlet U-shaped conductive sheet (9) is installed at the other end of the lower end of the ceramic cover (2) near the ceramic conical bracket (3). A fuse (10) is connected between the inlet U-shaped conductive sheet (4) and the outlet U-shaped conductive sheet (9). An abnormal alarm mechanism (12) is embedded in the inner side of the ceramic cover (2) near the outlet U-shaped conductive sheet (9). The fuse (10) includes a ceramic fuse tube (101). A bent conductive sheet two (103) is embedded at one end of the ceramic fuse tube (101), and a bent conductive sheet one (102) is embedded at the other end of the ceramic fuse tube (101). The upper ends of the bent conductive sheet two (103) and the bent conductive sheet one (102) are both fixedly connected to a contact (105) inside the ceramic fuse tube (101). A fuse piece (106) is electrically connected between the two contacts (105). A fuse piece (108) is provided in the middle of the fuse piece (106). Arc-extinguishing grid pieces (107) are provided at both the front and rear ends of the fuse piece (106) inside the ceramic fuse tube (101). An explosion cylinder (109) is provided inside the tube (101) near the lower end of the fuse section (108), and a filter cylinder (110) is provided inside the ceramic melting tube (101) near the upper end of the fuse section (108). The filter cylinder (110) is filled with insulating cotton (111). Several vent holes (104) are opened at the upper end of the ceramic melting tube (101) near the filter cylinder (110). The bent conductive sheet two (103) and the bent conductive sheet one (102) are electrically connected to the inlet U-shaped conductive sheet (4) and the outlet U-shaped conductive sheet (9) respectively. An opening groove (11) is opened in the middle of the ceramic conical card seat (3), and the ceramic melting tube (101) is embedded in the inner side of the opening groove (11).

2. A pluggable fuse according to claim 1, characterized in that, The ceramic conical card holder (3) is equipped with rubber card posts (13) at both the front and rear ends, and the inner sidewall of the conical card groove (7) is provided with card grooves (16) that match the rubber card posts (13) at both the front and rear ends.

3. A pluggable fuse according to claim 1, characterized in that, The incoming terminal block (15) includes a terminal block body (151), and a U-shaped conductive frame (153) is fixedly connected to the inner side of the terminal block body (151). A set of V-shaped conductive grooves (152) are formed at the junction of the terminal block body (151) and the U-shaped conductive frame (153). A wire fastening mechanism (154) is installed through the inner side of the U-shaped conductive frame (153).

4. A pluggable fuse according to claim 3, characterized in that, The wire fastening mechanism (154) includes a threaded inner cylinder (1541) fixed to the inside of the U-shaped conductive frame (153) by a set of connecting pieces (1543). A set of insertion holes (1542) are provided radially on the outer side of the threaded inner cylinder (1541), and a threaded outer cylinder (1546) is axially engaged on the inner side of the threaded inner cylinder (1541). A threaded rod (1547) is fixedly connected to the upper end of the threaded outer cylinder (1546), and a rotating cylinder (1544) is rotatably connected to the lower end of the threaded outer cylinder (1546). A number of bayonet slots (1545) are provided at the lower end of the rotating cylinder (1544), and a nut (1548) is fixedly connected to the upper end of the threaded rod (1547).

5. A pluggable fuse according to claim 1, characterized in that, The abnormal alarm mechanism (12) includes a warning light (121) slidably connected to the inside of the ceramic cover (2), and an electromagnet (128) fixed to the inside of the ceramic cover (2) and located at the lower end of the warning light (121). One end of the warning light (121) is electrically connected to a rigid conductive strip (126), and the other end of the warning light (121) is electrically connected to a battery holder (124) via a flexible wire (123). A button battery (125) is installed inside the battery holder (124). An iron plate (122) is fixedly connected to the bottom of the warning light (121), and an elastic plate (129) is fixedly connected to the upper end of the electromagnet (128). The elastic plate (129) is supported on the bottom of the iron plate (122).

6. A pluggable fuse according to claim 5, characterized in that, The lower end of the electromagnet (128) is connected to wire 2 (120) and wire 1 (127). The inner side of the ceramic cover (2) is provided with wire hole 1 (14) near the electromagnet (128). The inner side of the ceramic base (1) is provided with wire hole 2 (18) near one of the wiring slots (6). Wire 2 (120) passes through the inner side of wire hole 1 (14) and wire hole 2 (18) in sequence and is electrically connected to the neutral wire of the external circuit. Wire 1 (127) is electrically connected to the U-shaped conductive sheet (9) of the outgoing wire.

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