A varistor with surge protection

Abstract

The present invention provides a varistor with surge protection, belonging to the technical field of varistor, comprising a resistor housing, a first installation groove is provided on the top of the resistor housing, a varistor is arranged in the first installation groove, a detachable conductive component is provided on one side of the resistor housing, the conductive component comprises a detachable first electrode sheet and a second electrode sheet, the first electrode sheet is connected to an input end of the varistor, and the other end is connected to an external circuit; the second electrode sheet is connected to an output end of the varistor, and the other end is grounded; a quick-release component is provided on the outer side of the resistor housing corresponding to the conductive component, the quick-release component comprises a supporting frame, and the supporting frame is slidably sleeved on the outer side of the resistor housing; through the provision of the quick-release component, the resistor housing and the connecting housing can be conveniently disassembled to connect the first electrode sheet and the second electrode sheet in the housing for replacement and maintenance, thereby solving the problem that the traditional varistor is overall packaged and difficult to disassemble, and reducing the maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of varistor, and more specifically, particularly relates to a varistor with surge protection. Background Art

[0002] In the era of widespread application of modern electronic devices, the stability and safety of electronic systems are very important. During the operation of circuits, they will face various voltage abnormalities, among which surge voltage is a very destructive phenomenon. Surge voltage may be caused by many reasons, such as lightning striking power transmission lines, starting and stopping of large motors, fault switching in power systems, etc. These high-energy surge voltages generated instantly often have peak values ​​much higher than the normal working voltage, which can cause serious damage to sensitive components in electronic equipment.

[0003] As a circuit protection element, varistors can suppress surge voltage and are widely used in electronic circuits. However, after long-term exposure to high-intensity and frequent surge shocks, the electrodes of traditional varistors are prone to oxidation, resulting in unstable connection with the circuit. In addition, the varistors are usually packaged as a whole and difficult to disassemble, so the only option is to replace the entire varistor, which increases maintenance costs. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a varistor with surge protection to solve the technical problems in the prior art that the electrode sheets of traditional varistor are prone to oxidation after being subjected to high-intensity and frequent surge shocks for a long time, resulting in unstable connection with the circuit; and the varistor is usually an integral packaging structure that is difficult to disassemble, and the varistor can only be replaced as a whole, which increases the maintenance cost.

[0005] The purpose and effect of the varistor with surge protection of the present invention are achieved by the following specific technical means:

[0006] A varistor with surge protection comprises a resistor housing, a first mounting groove is provided on the top of the resistor housing, a varistor is arranged in the first mounting groove, a detachable conductive component is provided on one side of the resistor housing, the conductive component comprises a first electrode sheet and a second electrode sheet, the first electrode sheet is connected to the input end of the varistor, and the other end is connected to an external circuit; the second electrode sheet is connected to the output end of the varistor, and the other end is grounded; a quick-release component is provided on the outside of the resistor housing corresponding to the conductive component, the quick-release component comprises a support frame, and the support frame is slidably mounted on the outside of the resistor housing.

[0007] In a preferred embodiment, the conductive component also includes a connecting shell, and two groups of access holes for inserting wires are provided on one side of the connecting shell, and the first electrode sheet and the second electrode sheet are respectively provided on the adjacent sides of the two groups of access holes, and two groups of first clamping grooves are provided on the other end of the connecting shell, and the two groups of first clamping grooves are respectively connected to the two groups of access holes, and the first electrode sheet and the second electrode sheet are respectively provided with a first connecting end and a second connecting end at one end, and the first connecting end and the second connecting end are respectively detachably clamped in the two groups of the first clamping grooves.

[0008] In a preferred embodiment, a connection hole is formed on one side of the first connection end and the second connection end close to the varistor, the varistor input end is detachably inserted into the connection hole on the first connection end, and the varistor output end is detachably inserted into the connection hole on the second connection end.

[0009] In a preferred embodiment, mounting tubes are provided on both sides of the connection shell, two groups of mounting tubes are respectively provided with fixing threaded holes connected to the two groups of access holes, and the two groups of fixing threaded holes are provided with fixing bolts for fixing the wires.

[0010] In a preferred embodiment, a second mounting groove is provided at one end of the connecting shell, a baffle plate is arranged in the second mounting groove, one end of the first electrode sheet and one end of the second electrode sheet are both in contact with the baffle plate, a first sliding groove is provided at the top and bottom of the connecting shell corresponding to the second mounting groove, two groups of sliding plates are provided at the top and bottom of the baffle plate corresponding to the two groups of the first sliding grooves, the two groups of sliding plates are slidably connected to the two groups of the first sliding grooves respectively, a second clamping groove is provided at one end of the two groups of the first sliding grooves, a clamping block is provided at one end of the two groups of the sliding plates, and the two groups of clamping blocks are detachably clamped in the two groups of the second clamping grooves respectively.

[0011] In a preferred embodiment, two groups of buckles are provided at one end of the connecting shell, and two groups of buckle grooves are correspondingly opened on the inner wall of the first installation groove, and the two groups of buckles are respectively detachably fastened in the two groups of buckle grooves.

[0012] In a preferred embodiment, the quick-release assembly also includes two groups of disassembly top blocks, and limit blocks are arranged on both sides of the support frame. Second sliding grooves are provided on adjacent sides of the two groups of limit blocks respectively corresponding to the two groups of buckle grooves, and the two groups of disassembly top blocks are respectively slidably connected to the two groups of second sliding grooves.

[0013] In a preferred embodiment, one side corresponding to the two groups of the limit blocks is respectively provided with a through hole connected to the two groups of the second sliding grooves, and a push rod is slidably inserted into the two groups of the through holes, one end of the two groups of the push rod is respectively connected to the two groups of the disassembly push blocks, and the other end is connected to a push button, and a spring is sleeved on the push rod, one end of the spring is connected to the limit block, and the other end is in contact with the push button.

[0014] In a preferred embodiment, epoxy resin is disposed in the first mounting groove, the varistor is coated in the epoxy resin, and a detachable top plate is disposed at the opening of the first mounting groove.

[0015] In a preferred embodiment, a first limiting ring is provided on the outer side of the connecting shell corresponding to the supporting frame, and a second limiting ring is also provided on the resistor shell and the peripheral side of the top plate corresponding to the supporting frame, and the supporting frame is located between the first limiting ring and the second limiting ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the setting of the quick-release assembly, when the varistor needs to be repaired, the support frame is pushed to the disassembly position so that the two groups of disassembly top blocks are respectively aligned with the two groups of buckle grooves, and then the two groups of push keys are pressed. The two groups of disassembly top blocks are driven by the two groups of ejector rods to be pushed into the two groups of buckle grooves respectively, so as to eject the two groups of buckles from the buckle grooves, release the connection between the resistor housing and the connecting housing, and then the internal parts can be repaired or replaced, which solves the problem of overall packaging and difficult disassembly of traditional varistors and reduces the maintenance cost.

[0018] 2. Through the setting of the conductive component, the first electrode sheet and the second electrode sheet are respectively disassembled and clamped in the two groups of first clamping grooves on the connection shell through the first connecting end and the second connecting end at one end thereof. When the varistor is subjected to high-intensity and frequent surge impacts for a long time, resulting in oxidation of the first electrode sheet and the second electrode sheet, and needs maintenance or replacement, after removing the connection shell through the quick-release component, the two groups of clamping blocks are removed from the two groups of second clamping grooves, and the shielding plate can be removed to expose the first electrode sheet and the second electrode sheet in the two groups of access holes. The first connecting end and the second connecting end can be removed from the two groups of first clamping grooves by pushing the first electrode sheet and the second electrode sheet, so that the electrode sheets can be easily replaced and repaired without replacing the entire varistor, further reducing the maintenance cost.

[0019] 3. Through the setting of epoxy resin, when the varistor is used, the epoxy resin in the first installation groove is used to cover and protect the varistor, which can effectively prevent the erosion of the varistor by external factors; through the setting of two sets of installation tubes and fixing bolts, when the varistor is installed on the circuit, the input wire is contacted with the first electrode sheet in one set of access holes, and then the fixing bolt is turned to fit and fix the input wire to the first electrode sheet, and then the grounding wire is contacted with the second electrode sheet in the other set of access holes, and then the other fixing bolt is turned to fit and fix the grounding wire to the second electrode sheet, and the installation of the varistor is completed. When disassembling, the two sets of fixing bolts can be rotated in reverse, which makes the installation and removal of the external wires more convenient and shortens the installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a varistor with surge protection according to the present invention;

[0021] Figure 2 An exploded diagram of a varistor with surge protection according to the present invention;

[0022] Figure 3 It is a schematic structural diagram of the conductive components in a varistor with surge protection according to the present invention after being assembled;

[0023] Figure 4 It is a schematic structural diagram of a disassembled conductive component in a varistor with surge protection according to the present invention;

[0024] Figure 5 It is a schematic structural diagram of a varistor with surge protection according to the present invention, wherein a housing, a first electrode sheet and a second electrode sheet are connected and assembled;

[0025] Figure 6 for Figure 5 Schematic diagram of the structure after splitting;

[0026] Figure 7 It is a schematic structural diagram of a quick-release assembly in a varistor with surge protection according to the present invention after assembly;

[0027] Figure 8 For Figure 7 Schematic diagram of the structure after splitting;

[0028] Fig. 9 For the present invention Figure 8 A magnified schematic diagram of area a in the middle;

[0029] Fig.10 The present invention is a schematic structural diagram of a second sliding groove and a disassembled top block in a varistor with surge protection after being disassembled.

[0030] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0031] 101, resistor housing; 102, first mounting groove; 103, varistor; 104, epoxy resin; 105, top plate; 106, first limiting ring; 107, second limiting ring; 201, first electrode sheet; 202, second electrode sheet; 203, connecting housing; 204, access hole; 205, first locking groove; 206, first connecting end; 207, second connecting end; 208, connecting hole; 209, mounting tube; 2 10. Fixing threaded hole; 211. Fixing bolt; 212. Second mounting slot; 213. Shielding plate; 214. First sliding slot; 215. Sliding plate; 216. Second blocking slot; 217. Block; 301. Support frame; 302. Buckle; 303. Buckle slot; 304. Disassembly top block; 305. Limiting block; 306. Second sliding slot; 307. Perforation; 308. Push rod; 309. Push button; 310. Spring. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] Example:

[0034] As attached Figure 1 To Attachment Fig.10 As shown:

[0035] The present invention provides a varistor with surge protection, comprising a resistor housing 101, a first mounting groove 102 is provided on the top of the resistor housing 101, a varistor 103 is arranged in the first mounting groove 102, a detachable conductive component is provided on one side of the resistor housing 101, and the conductive component comprises a first electrode sheet 201 and a second electrode sheet 202, the first electrode sheet 201 is connected to the input end of the varistor 103, and the other end is connected to the external circuit; the second electrode sheet 202 is connected to the output end of the varistor 103 The quick-release assembly is provided on the outer side of the resistor housing 101 corresponding to the conductive assembly, and the quick-release assembly includes a support frame 301, which is slidably mounted on the outer side of the resistor housing 101; the electrode sheet of the varistor may be oxidized under long-term use and surge impact, and the quick-release assembly can be easily removed from the resistor housing 101, and then the first electrode sheet 201 and the second electrode sheet 202 can be maintained or replaced, thereby enhancing the stability of the varistor.

[0036] Please refer to Figure 3 and Figure 4As shown, the conductive component also includes a connection shell 203, and two groups of access holes 204 for inserting wires are provided on one side of the connection shell 203, and the first electrode sheet 201 and the second electrode sheet 202 are respectively provided on the adjacent sides of the two groups of access holes 204. Two groups of first clamping grooves 205 are provided on the other end of the connection shell 203, and the two groups of first clamping grooves 205 are respectively connected with the two groups of access holes 204, and the first electrode sheet 201 and the second electrode sheet 202 are respectively provided with a first connection end 206 and a second connection end 207 at one end, and the first connection end 206 and the second connection end 207 are respectively detachably clamped in the two groups of first clamping grooves 205; by pushing the first electrode sheet 201 and the second electrode sheet 202, the first connection end 206 and the second connection end 207 can be removed from the two groups of first clamping grooves 205, thereby realizing the replacement and maintenance of the electrode sheets, which not only improves the convenience of maintenance, but also avoids unnecessary loss caused by replacing the varistor as a whole, and reduces the maintenance cost.

[0037] Please refer to Figure 4 As shown, a connection hole 208 is provided on one side of the first connection end 206 and the second connection end 207 close to the varistor 103, in order to realize a quick connection between the varistor 103 and the conductive component. The input end of the varistor 103 is detachably inserted into the connection hole 208 on the first connection end 206, and the output end of the varistor 103 is detachably inserted into the connection hole 208 on the second connection end 207, which not only makes the wiring between the varistor 103 and the conductive component more convenient, but also increases the connection firmness between the two, effectively preventing the problem of poor contact; in addition, the setting of the connection hole 208 also facilitates the installation and removal of the varistor 103. When the varistor 103 needs to be repaired or replaced, it only needs to be taken out of the connection hole 208 without disassembling the entire conductive component, thereby improving the convenience of maintenance, realizing the quick connection and separation between the varistor 103 and the conductive component, and further reducing the maintenance cost while ensuring reliability.

[0038] Please refer to Figure 4 , Figure 5 and Figure 6As shown, mounting tubes 209 are provided on both sides of the connection shell 203, and fixing threaded holes 210 connected to the two groups of access holes 204 are respectively provided in the two groups of mounting tubes 209, so as to realize the quick connection between the external wire and the electrode sheet inside the varistor; specifically, fixing bolts 211 for fixing the wires are provided in the two groups of fixing threaded holes 210. When installing the varistor on the circuit, it is only necessary to insert the input wire into one group of access holes 204 to contact the first electrode sheet 201, and then screw the fixing bolts 211 to fit the input wire and the first electrode sheet 201 together; then insert the ground wire into the other group of access holes 204 to connect with the second electrode sheet 202. The whole installation process of the varistor can be completed by screwing the other fixing bolt 211 to fit and fix the ground wire to the second electrode sheet 202; when disassembling, only the two sets of fixing bolts 211 need to be rotated in the opposite direction to quickly separate the external wires, thereby improving the convenience of maintenance; the setting of the installation cylinder 209 and the fixing bolts 211 not only makes installation and disassembly more convenient and quick, but also effectively prevents the problem of poor contact; the fixing bolts 211 are used to fix the wires to the ground, and also ensure close contact between the wires and the electrode sheet to ensure good conductivity; at the same time, the setting of the installation cylinder 209 can prevent the fixing bolts 211 from leaking out, prevent accidents, and improve safety.

[0039] Please refer to Figure 4 As shown in the figure, in addition to using the installation tube 209 and the fixing bolt 211 to realize the quick connection of the external wire, the connection shell 203 is also provided with a second installation groove 212 at one end, and a shielding plate 213 is arranged inside it. One end of the first electrode sheet 201 and the second electrode sheet 202 are both in contact with the shielding plate 213. The shielding plate 213 plays a role of isolation and protection, avoiding the leakage of the first electrode sheet 201 and the second electrode sheet 202, preventing accidents, and further improving safety; in order to facilitate the installation and removal of the shielding plate 213, the top and bottom of the connection shell 203 are provided with a first sliding groove 214 corresponding to the second installation groove 212, and the top of the shielding plate 213 is in contact with the shielding plate 213. Two groups of sliding plates 215 are also provided at the bottom, and the two groups of sliding plates 215 can slide in the first sliding groove 214. In addition, a second retaining groove 216 is provided at one end of the two groups of first sliding grooves 214, and a clamping block 217 is also provided at one end of the two groups of sliding plates 215. These clamping blocks 217 are detachably clamped in the second retaining groove 216, which can not only firmly fix the shielding plate 213 during normal use to prevent it from accidentally shifting, but also when maintenance is required, only the two groups of clamping blocks 217 need to be taken out of the second retaining groove 216, and the shielding plate 213 can be easily removed, so that the first electrode sheet 201 and the second electrode sheet 202 in the two groups of access holes 204 can be quickly exposed.

[0040] Please refer to Figure 2 , Figure 7 and Figure 8 As shown, one end of the connecting shell 203 is provided with two sets of buckles 302, and the inner wall of the first installation groove 102 is correspondingly provided with two sets of buckle grooves 303, and the two sets of buckles 302 are detachably arranged in the two sets of buckle grooves 303; when the varistor needs to be disassembled, the two sets of buckles 302 are simply pulled out from the buckle grooves 303, and the whole process can be completed quickly; at the same time, the quick-release assembly also includes two sets of disassembly top blocks 304, and both sides of the support frame 301 are provided with limit blocks 305, and the two sets of On one side adjacent to the limit block 305, second sliding grooves 306 are respectively provided corresponding to the two groups of buckle grooves 303; the two groups of disassembly top blocks 304 are respectively slidably connected to the two groups of second sliding grooves 306, so that the disassembly top blocks 304 can slide smoothly along the second sliding grooves 306 under the constraint of the limit block 305, and when the varistor needs to be disassembled, only the two groups of disassembly top blocks 304 need to be gently pushed to drive the buckles 302 on the connecting shell 203 to gradually disengage from the buckle grooves 303, thereby quickly disassembling.

[0041] Please refer to Figure 8 , Fig. 9 with Fig.10 As shown, one side corresponding to the two groups of limit blocks 305 is respectively provided with a through hole 307 connected with the two groups of second sliding grooves 306, and the two groups of through holes 307 can be slidably penetrated with a push rod 308, one end of the two groups of push rods 308 is respectively connected to the two groups of disassembly top blocks 304, and the other end is connected to a push button 309; by using the push rod 308 as an intermediate link, when the user presses the two groups of push buttons 309, the push rod 308 can drive the corresponding disassembly top block 304 to be pushed into the two groups of buckle grooves 303 respectively, so as to push the two groups of buckles 302 out of the buckle grooves 303, and finally release the resistor housing 1 01 and the connection shell 203; the disassembly operation process is simplified, and accidental damage caused by excessive force or improper direction can be effectively avoided; the setting of two sets of push buttons 309 improves the convenience of maintenance, and solves the problem that the traditional varistor is integrally packaged and difficult to disassemble. The traditional varistor is usually integrally packaged. Once a failure occurs, the entire device needs to be replaced, which undoubtedly increases the maintenance cost; and through the setting of the quick-release component, the user only needs to remove the connection shell 203, so as to achieve targeted maintenance or replacement (such as electrode sheets), reducing the maintenance cost.

[0042] A spring 310 is sleeved on each push rod 308, one end of the spring 310 is connected to the limit block 305, and the other end is in contact with the corresponding push button 309; when the user releases the push button 309, the two sets of disassembly push blocks 304 can be smoothly pushed out of the buckle groove 303 with the help of the reset force of the two sets of springs 310, thereby improving the smoothness of the entire disassembly process.

[0043] Please refer to Figure 2 As shown, the first installation groove 102 is provided with epoxy resin 104 inside, and the varistor 103 is completely covered therein, which can not only effectively protect the varistor 103 from erosion by various external factors, but also has excellent insulation and corrosion resistance, and also has excellent mechanical strength and impact resistance, and can well wrap and fix the internal varistor 103 to ensure its long-term stable operation; in addition, in order to facilitate users to inspect or replace the internal components, a detachable top plate 104 is also provided at the opening of the first installation groove 102 05, which provides convenience for maintenance work. By removing the top plate 105, the user can directly contact the internal varistor 103, which improves the maintainability of the resistor; the outer side of the connecting shell 203 is provided with a first limit ring 106 corresponding to the support frame 301, and the peripheral sides of the resistor shell 101 and the top plate 105 are also provided with a second limit ring 107 corresponding to the support frame 301, and the support frame 301 is located between the first limit ring 106 and the second limit ring 107. When the two groups of disassembly top blocks 304 are aligned with the two groups of buckle grooves 303, it is the disassembly position.

[0044] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A varistor with surge protection, characterized in that: The invention comprises a resistor housing (101), wherein a first installation groove (102) is provided on the top of the resistor housing (101), a varistor (103) is arranged in the first installation groove (102), a detachable conductive component is provided on one side of the resistor housing (101), the conductive component comprises a first electrode sheet (201) and a second electrode sheet (202), the first electrode sheet (201) is connected to the input end of the varistor (103), and the other end is connected to an external circuit; the second electrode sheet (202) is connected to the output end of the varistor (103), and the other end is grounded; a quick-release component is provided on the outside of the resistor housing (101) corresponding to the conductive component, the quick-release component comprises a support frame (301), and the support frame (301) is slidably sleeved on the outside of the resistor housing (101).

2. A varistor with surge protection as claimed in claim 1, characterized in that: The conductive component further comprises a connection shell (203), one side of the connection shell (203) is provided with two groups of access holes (204) for inserting wires, the first electrode sheet (201) and the second electrode sheet (202) are respectively arranged on the adjacent sides of the two groups of access holes (204), the other end of the connection shell (203) is provided with two groups of first retaining grooves (205), the two groups of first retaining grooves (205) are respectively connected to the two groups of access holes (204), one end of the first electrode sheet (201) and the second electrode sheet (202) are respectively provided with a first connection end (206) and a second connection end (207), the first connection end (206) and the second connection end (207) are respectively detachably retained in the two groups of the first retaining grooves (205).

3. A varistor with surge protection as claimed in claim 2, characterized in that: A connection hole (208) is provided on one side of the first connection end (206) and the second connection end (207) close to the varistor (103); the input end of the varistor (103) is detachably inserted into the connection hole (208) on the first connection end (206); and the output end of the varistor (103) is detachably inserted into the connection hole (208) on the second connection end (207).

4. A varistor with surge protection as claimed in claim 2, characterized in that: Both sides of the connection housing (203) are provided with mounting tubes (209), and two groups of mounting tubes (209) are respectively provided with fixing threaded holes (210) connected to the two groups of access holes (204), and the two groups of fixing threaded holes (210) are respectively provided with fixing bolts (211) for fixing the wires.

5. A varistor with surge protection as claimed in claim 2, characterized in that: A second mounting groove (212) is provided at one end of the connection shell (203), a shielding plate (213) is arranged in the second mounting groove (212), one end of the first electrode sheet (201) and the second electrode sheet (202) are both in contact with the shielding plate (213), a first sliding groove (214) is provided at the top and bottom of the connection shell (203) corresponding to the second mounting groove (212), two groups of sliding plates (215) are provided at the top and bottom of the shielding plate (213) corresponding to the two groups of the first sliding grooves (214), the two groups of sliding plates (215) are respectively slidably connected to the two groups of the first sliding grooves (214), a second locking groove (216) is provided at one end of the two groups of the first sliding grooves (214), a clamping block (217) is provided at one end of the two groups of the sliding plates (215), and the two groups of the clamping blocks (217) are respectively detachably clamped in the two groups of the second locking grooves (216).

6. A varistor with surge protection as claimed in claim 2, characterized in that: Two groups of buckles (302) are arranged at one end of the connection shell (203), and two groups of buckle grooves (303) are correspondingly opened on the inner wall of the first installation groove (102), and the two groups of buckles (302) are respectively detachably buckled in the two groups of buckle grooves (303).

7. A varistor with surge protection as claimed in claim 6, characterized in that: The quick-release assembly also includes two groups of disassembly top blocks (304), and limit blocks (305) are arranged on both sides of the support frame (301). The adjacent sides of the two groups of limit blocks (305) are respectively provided with second sliding grooves (306) corresponding to the two groups of buckle grooves (303), and the two groups of disassembly top blocks (304) are respectively slidably connected to the two groups of the second sliding grooves (306).

8. A varistor with surge protection as claimed in claim 7, characterized in that: One side corresponding to the two groups of the limit blocks (305) is respectively provided with a through hole (307) connected with the two groups of the second sliding grooves (306); a push rod (308) is slidably inserted into the two groups of the through holes (307); one end of the two groups of the push rod (308) is respectively connected to the two groups of the disassembly push blocks (304), and the other end is connected to a push button (309); a spring (310) is sleeved on the push rod (308); one end of the spring (310) is connected to the limit block (305), and the other end is in contact with the push button (309).

9. A varistor with surge protection as claimed in claim 2, characterized in that: Epoxy resin (104) is arranged in the first installation groove (102), the varistor (103) is coated in the epoxy resin (104), and a detachable top plate (105) is arranged at the opening of the first installation groove (102).

10. A varistor with surge protection as claimed in claim 9, characterized in that: A first limiting ring (106) is provided on the outer side of the connection shell (203) corresponding to the support frame (301), and a second limiting ring (107) is also provided on the peripheral side of the resistor shell (101) and the top plate (105) corresponding to the support frame (301), and the support frame (301) is located between the first limiting ring (106) and the second limiting ring (107).

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