Pressure-sensitive electrode, pressure-sensitive resistor assembly and surge protection device

Abstract

The invention relates to a pressure-sensitive electrode, a pressure-sensitive resistor assembly and a surge protection device, and belongs to the technical field of pressure-sensitive resistors. The surge protection device comprises a piezoresistor assembly, the piezoresistor assembly comprises a voltage-sensitive electrode, the voltage-sensitive electrode comprises an electrode body and a welding boss, the welding boss is arranged on the connecting side of the electrode body, the connecting side of the electrode body is provided with a first blocking groove, and the first blocking groove blocks the periphery of the welding boss in partial or all directions. According to the pressure-sensitive electrode, the pressure-sensitive resistor assembly and the surge protection device provided by the invention, the connecting side of the electrode body is attached to the gasket, the invasion interval is formed between the connecting side of the electrode body and the gasket, and in the invasion interval, the direction from the welding boss to the edge of the electrode body is the invasion direction; the first blocking groove can block a capillary phenomenon water absorption path of liquid water in the invasion direction. Through the arrangement, moisture can be effectively prevented from flowing to the edge of the ceramic of the piezoresistor along the surface of the electrode body, and the piezoresistor is prevented from being affected with damp and being short-circuited and invalid.

Description

Technical Field

[0001] This invention belongs to the field of varistor technology, specifically relating to a varistor electrode, a varistor assembly, and a surge protector. Background Technology

[0002] In varistor-type surge protectors, varistor assemblies are typically used. A varistor assembly usually includes a housing, a varistor, a varistor electrode, and a gasket. The varistor electrode is attached and fixed to one side of the varistor, and a gasket is provided between the varistor electrode and the housing.

[0003] A pressure-sensitive electrode typically consists of an electrode body and a welding boss. The electrode body has a flat plate structure with a relatively smooth surface. The electrode body is attached and fixed to the gasket. However, no matter how tightly the two are attached, there may be a certain gap, and the size of the gap is very small.

[0004] Since the welded boss is exposed, moisture will condense here. Due to the existence of tiny gaps between the electrode body and the gasket, under the action of capillary action, the liquid condensate will seep from the welded boss to the edge of the electrode body, and then reach the varistor, causing the varistor to become damp and creating a risk of failure. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a varistor electrode, a varistor assembly, and a surge protector that can effectively prevent moisture (liquid condensation) from flowing along the surface of the electrode body to the varistor, thereby avoiding moisture damage and short circuits in the varistor.

[0006] The technical solution of the present invention is as follows: The present invention provides a pressure-sensitive electrode, including an electrode body and a welding boss. The welding boss is disposed on the connection side of the electrode body, and a first blocking groove is provided on the connection side of the electrode body. The first blocking groove blocks part or all of the directions around the welding boss.

[0007] As an alternative, the first blocking groove is disposed on at least one side around the welding boss.

[0008] Alternatively, the first blocking groove may surround the welding boss.

[0009] Alternatively, the first blocking groove may be in the form of a closed ring.

[0010] As an alternative, the first blocking groove has an intermittent structure.

[0011] As an option, the electrode body is provided with the first blocking groove.

[0012] As an option, the electrode body is provided with at least two of the first blocking grooves, and the at least two of the first blocking grooves are spaced apart around the welding boss.

[0013] Alternatively, the electrode body can be in the form of a sheet or a plate.

[0014] The present invention also provides a varistor assembly, including the varistor electrode described above.

[0015] As an optional solution, the varistor assembly further includes a housing and a varistor, with the varistor electrode attached to the varistor, and the opening of the first blocking groove being closed to form a blocking cavity.

[0016] As an option, the varistor assembly further includes a gasket located between the varistor electrode and the housing, wherein the opening of the first blocking groove is closed by one side of the gasket.

[0017] As an option, at least one side of the gasket and the housing on opposite sides is provided with a second blocking groove.

[0018] Alternatively, the second blocking groove may surround the welding boss.

[0019] Alternatively, the second blocking groove may be in the form of a closed ring.

[0020] As an optional solution, potting compound is injected between the varistor and the housing.

[0021] The present invention also provides a surge protector, including the above-described varistor assembly.

[0022] The beneficial effects of this invention are: The varistor electrode, varistor assembly, and surge protector provided by this invention have an electrode body connection side that fits into a gasket, forming an intrusion zone between them. Within this intrusion zone, the direction from the welding boss to the edge of the electrode body is the intrusion direction. A first blocking groove can block the capillary absorption path of liquid water in the intrusion direction. This design effectively prevents moisture (liquid condensation) from flowing along the surface of the electrode body to the edge of the ceramic varistor, avoiding moisture absorption and short-circuit failure of the varistor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of the present invention will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale to actual size; the focus is on illustrating the main points of the invention.

[0024] Figure 1 This is a schematic diagram of the structure of the varistor assembly provided in Embodiment 1 of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the varistor assembly provided in Embodiment 1 of the present invention. Figure 2 ; Figure 3 for Figure 2 AA sectional view (with shims); Figure 4 for Figure 3 A magnified view of part B; Figure 5 for Figure 2 AA section view (without shims); Figure 6 for Figure 5 A magnified view of part C; Figure 7 This is a schematic diagram of the structure of the varistor electrode (single first blocking groove) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the varistor electrode (single first blocking groove) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 2 ; Figure 9 This is a schematic diagram of the structure of the varistor electrode (two first blocking grooves) of the varistor assembly provided in Embodiment 1 of the present invention; Figure 10 A partial cross-sectional view of the varistor electrode of the varistor assembly provided in Embodiment 1 of the present invention. Figure 1 ; Figure 11 A partial cross-sectional view of the varistor electrode of the varistor assembly provided in Embodiment 1 of the present invention. Figure 2 ; Figure 12 A partial cross-sectional view of the varistor electrode of the varistor assembly provided in Embodiment 1 of the present invention. Figure 3 ; Figure 13A partial cross-sectional view of the varistor electrode of the varistor assembly provided in Embodiment 1 of the present invention. Figure 4 ; Figure 14 A partial cross-sectional view of the varistor electrode of the varistor assembly provided in Embodiment 1 of the present invention. Figure 5 ; Figure 15 This is a schematic diagram of the structure of the varistor electrode (with a first blocking groove in a partial direction) of the varistor assembly provided in Embodiment 1 of the present invention; Figure 16 This is a schematic diagram of the structure of the varistor electrode (with a first blocking groove around its perimeter) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 1 ; Figure 17 This is a schematic diagram of the structure of the varistor electrode (with a first blocking groove around its perimeter) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 2 ; Figure 18 This is a schematic diagram of the structure of the varistor electrode (intermittent first blocking groove) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 1 ; Figure 19 This is a schematic diagram of the structure of the varistor electrode (intermittent first blocking groove) of the varistor assembly provided in Embodiment 1 of the present invention. Figure 2 ; Figure 20 This is a schematic diagram of the structure of the varistor assembly provided in Embodiment 2 of the present invention. Figure 1 ; Figure 21 This is a schematic diagram of the structure of the varistor assembly provided in Embodiment 2 of the present invention. Figure 2 ; Figure 22 for Figure 21 A magnified view of part E; Figure 23 This is a schematic diagram of the surge protector provided in Embodiment 3 of the present invention; Figure 24 This is a schematic diagram of the surge protector (without the outer casing) provided in Embodiment 3 of the present invention.

[0025] Icons: 100-Surge protector; 10-Varistor assembly; 11-Varistor electrode; 12-Varistor; 13-Gasket; 14-Housing; 15-Potent; 110-Electrode body; 111-Welding boss; 112-First blocking groove; 113-Second blocking groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] Example 1: Please refer to Figure 1 , Figure 2 As shown, Embodiment 1 of the present invention provides a varistor component 10, which can be applied to, but is not limited to, surge protectors (see Embodiment 2), refrigerators, air conditioners, and other electrical devices that are applied to the varistor 12.

[0031] In this regard, please combine Figures 3-6 As shown, the varistor assembly 10 mainly consists of a housing 14, a varistor 12, a varistor electrode 11, and a gasket 13, with the varistor 12, varistor electrode 11, and gasket 13 located inside the housing 14.

[0032] First, it should be noted that the varistor 11 can be manufactured, used, and sold independently, and it does not depend on the housing 14, the varistor 12, and the gasket 13. Of course, during the production process, the varistor 11 can also be assembled into a varistor assembly 10 or a surge protector 100 for manufacturing, use, and sale. In this embodiment, the varistor 11 is described in combination with the housing 14, the varistor 12, and the gasket 13, mainly to illustrate the usage and working principle of the varistor 11.

[0033] The design of the housing 14 is not limited; it can be an independent housing structure or a portion of the surge protector 100 structure can be used as the housing 14.

[0034] The size and material of the housing 14 are not limited and can be set according to actual needs. It is generally made of non-conductive material.

[0035] The housing 14 is provided with a receiving cavity, and the varistor 12 and the like are embedded in the receiving cavity.

[0036] A varistor 12 is a resistive device with nonlinear current-voltage characteristics, whose resistance value is sensitive to applied voltage. The structure of a varistor 12 can refer to existing technology. Generally, a varistor 12 has a ceramic body, electrodes, and a package shell. The ceramic body is mainly composed of zinc oxide particles, with small amounts of other metal oxides such as bismuth oxide, cobalt oxide, etc. Metal electrodes are placed on both sides of the ceramic body for electrical connection. The external enclosure is made of epoxy resin or a ceramic shell to provide mechanical protection and insulation.

[0037] When the operating voltage is lower than the varistor voltage, the varistor 12 is in a high-resistance state, which is equivalent to an open circuit and does not affect the circuit. When the surge voltage, such as lightning or static electricity, exceeds the varistor voltage, the resistance of the varistor 12 drops sharply, instantly dissipating the large current and clamping the voltage within a safe range. When the surge disappears, the varistor 12 automatically returns to the high-resistance state.

[0038] The size and shape of the varistor 12 can be selected according to needs, or you can directly choose a mature product on the market.

[0039] The varistor electrode 11 is tightly attached to one side of the varistor 12, and the two are electrically connected.

[0040] The connection method between the varistor 11 and the varistor 12 is not limited, such as bonding, welding, fixed connection through threaded fasteners, or simply pressing and sticking together, which are separable connections.

[0041] Please combine Figures 7-9 As shown, the pressure-sensitive electrode 11 includes an electrode body 110 and a welding boss 111. The electrode body 110 and the welding boss 111 can be integrally formed, or they can be separate structures connected and fixed by welding, threaded fasteners, or other methods. Preferably, the electrode body 110 and the welding boss 111 are integrally formed.

[0042] The structure of the electrode body 110 is not limited; it can be block-shaped, sheet-shaped, or plate-shaped, etc. In this embodiment, the electrode body 110 is a sheet-shaped structure, such as a rectangular sheet-shaped structure. Of course, in other embodiments, the electrode body 110 can also be triangular, trapezoidal, pentagonal, circular, irregular, etc. The length, width, thickness, etc. of the electrode body 110 can be set as needed, and can be large or small.

[0043] The electrode body 110 has a bonding side and a connecting side, wherein the bonding side is used to bond with the varistor 12, and the connecting side is used to bond with the gasket 13. The connecting side can be a plane, a folded surface, or a curved surface, etc.

[0044] The welding boss 111 is located on the connection side of the electrode body 110. The position of the welding boss 111 is not limited. For example, the welding boss 111 can be located in the middle of the electrode body 110 or near the edge of the electrode body 110.

[0045] The shape of the welding boss 111 is not limited, such as cylindrical, prismatic, or irregular. In this embodiment, the cross-section of the welding boss 111 is approximately rectangular. The welding boss 111 is mainly used for low-temperature welding with structures such as the release spring of the surge protector 100.

[0046] The electrode body 110 is provided with a first blocking groove 112, which is located in part or all of the directions around the welding boss 111, thereby blocking a specific direction or all of the directions around the welding boss 111. In this embodiment, the first blocking groove 112 is preferably surrounding the welding boss 111.

[0047] The number of first blocking grooves 112 is unlimited, for example, one (please refer to...). Figure 7 , Figure 8 As shown), two (please refer to) Figure 9 As shown), three, etc. If there is one first blocking groove 112, the first blocking groove 112 surrounds the welding boss 111. If there are two or more first blocking grooves 112, multiple first blocking grooves 112 are spaced apart and surround the welding boss 111, and a blocking interval is formed between two adjacent first blocking grooves 112; the width of the blocking interval between two adjacent first blocking grooves 112 can be equal or unequal at each point; the width of different blocking intervals can be equal or unequal.

[0048] The cross-sectional shape of the first blocking groove 112 is not limited; for example, please refer to... Figures 10-14 As shown, the cross-section of the first blocking groove 112 is V-shaped, rectangular, trapezoidal, arc-shaped, irregular, etc., and preferably, the cross-section of the first blocking groove 112 is V-shaped.

[0049] In some embodiments, the first blocking groove 112 may also be distributed only in a portion of the direction surrounding the welding boss 111 (see reference). Figure 15As shown), for example, a first blocking groove 112 is provided on the left or right side of the welding boss 111, while no first blocking groove 112 is provided in other directions. The first blocking groove 112 can be continuous or intermittent. This is because in some electrical devices or varistors 12, it is only necessary to prevent moisture (liquid condensation) from penetrating in a specific direction, and it is not necessary to prevent moisture (liquid condensation) from penetrating in other directions.

[0050] Preferably, the first blocking groove 112 is generally annular, such as a circular ring, square ring, or irregularly shaped ring. The first blocking groove 112 can be a closed annular structure or an intermittent annular structure. Please refer to... Figure 8 , Figure 16 , Figure 17 As shown, the closed annular structure refers to the first blocking groove 112 being connected end to end to form a complete annular structure; please refer to... Figure 18 , Figure 19 As shown, the intermittent annular structure refers to the following: the first blocking groove 112 includes several groove segments, with adjacent groove segments not connected. Multiple groove segments together form an annular structure. It is important to note that because the multiple groove segments are not connected, gaps exist between adjacent groove segments. To prevent moisture (liquid condensation) from seeping through these gaps, it is preferable that adjacent groove segments partially overlap, thus extending the capillary absorption path as much as possible. Of course, it is also possible that adjacent groove segments do not overlap, or that the first blocking groove 112 includes multiple annularly distributed groove segments forming a labyrinthine structure.

[0051] In this embodiment, the first blocking groove 112 is preferably a closed annular structure, which can completely block the capillary absorption path of moisture (liquid condensation).

[0052] Please combine Figure 3 , Figure 4 As shown, the gasket 13 is located between the electrode body 110 and the housing 14, that is, one side of the gasket 13 is attached to the connecting side of the electrode body 110 and the other side is attached to the inner surface of the housing 14. The space between the gasket 13 and the electrode body 110 can be filled with potting compound 15, or it can be left unfilled, or partially filled with potting compound 15 and partially unfilled. However, it should be noted that if potting compound 15 is filled between the gasket 13 and the electrode body 110, then the potting compound 15 cannot be filled into the first blocking groove 112, because the first blocking groove 112 blocks capillary action; if the first blocking groove 112 is filled with potting compound 15, this function will be lost.

[0053] The structure and material of the gasket 13 can refer to existing technology. A through hole can be provided in the center of the gasket 13, through which the welding boss 111 passes, and the gasket 13 surrounds the welding boss 111. The size of the gasket 13 can match the size of the electrode body 110. The size of the gasket 13 can be larger than the size of the electrode body 110, smaller than the size of the electrode body 110, or equal to the size of the electrode body 110.

[0054] For ease of description, the following definition is made: an intrusion zone is formed between the connecting side of the electrode body 110 and the gasket 13. Within the intrusion zone, the direction from the edge of the welding boss 111 to the edge of the electrode body 110 is the intrusion direction.

[0055] No matter how tightly the electrode body 110 and the gasket 13 are fitted together, there will always be a tiny gap in the intrusion area. Under the action of capillary action, moisture (liquid condensation) can penetrate through the tiny gap along the intrusion direction.

[0056] Capillary action is a relatively common physical phenomenon, or natural phenomenon. Essentially, it's the phenomenon of liquids (water, oil, etc.) seeping through very tiny pores or tight gaps between objects. For example, water deep in the soil cannot seep to the surface through loose soil, but it can seep to the surface through compacted soil. Therefore, in agricultural production, loosening the soil is often used to combat drought, because once the soil is compacted, water from deeper layers will seep to the surface through the tiny gaps between the soil particles.

[0057] In the solution provided in this embodiment, one side of the gasket 13 can close the opening of the first blocking groove 112, that is, the first blocking groove 112 is opposite to one side of the gasket 13, and the first blocking groove 112 and the gasket 13 together form a closed blocking cavity, which surrounds the welding boss 111.

[0058] Capillary action can only penetrate through tiny gaps, while larger gaps or spaces can block it. An open space formed at the blocking cavity can block capillary action, preventing moisture (liquid condensation) from continuously penetrating through this area.

[0059] When moisture (liquid condensation) reaches the blocking cavity, it must fill the first blocking groove 112 before it can continue to advance under the action of capillary action. Therefore, the first blocking groove 112 can effectively prevent moisture (liquid condensation) from penetrating along the surface of the electrode body 110 to the edge of the electrode body 110.

[0060] In some embodiments, please combine Figure 5 , Figure 6As shown, the varistor assembly 10 does not include the gasket 13, but the first blocking groove 112 is directly opposite to the inner surface of the housing 14 (the two can be filled with potting compound 15, or not filled with potting compound 15).

[0061] In addition, welding through holes can also be provided on the housing 14, and welding bosses 111 can be exposed from the welding through holes to facilitate welding with external components such as release springs.

[0062] The gap between the varistor 12 and the housing 14 is filled with potting compound 15. The potting compound 15 is mainly used to fix the varistor 12 inside the housing 14 and to keep the varistor 12 in a closed environment. The composition of the potting compound 15 can refer to the prior art, and will not be described in detail here.

[0063] Example 2: Example 2 of the present invention provides a varistor assembly 10, which is an improvement on Example 1. The improvement is that at least one side of the opposite side of the gasket 13 and the housing 14 is provided with a second blocking groove 113, that is: the side of the gasket 13 near the housing 14 and / or the side of the housing 14 near the gasket 13 is provided with a second blocking groove 113.

[0064] The number of second blocking grooves 113 is unlimited, such as one, two, or three. If there is only one second blocking groove 113, it surrounds the welding boss 111. If there are two or more second blocking grooves 113, they are spaced apart and surround the welding boss 111, forming a blocking gap between adjacent second blocking grooves 113. The width of the blocking gap between adjacent second blocking grooves 113 can be equal or unequal at all points; the widths of different blocking gaps can also be equal or unequal.

[0065] The cross-sectional shape of the second blocking groove 113 is not limited. For example, the cross-section of the second blocking groove 113 can be V-shaped, rectangular, trapezoidal, arc-shaped, irregular, etc. Preferably, the cross-section of the second blocking groove 113 is V-shaped.

[0066] In some embodiments, the second blocking groove 113 may be distributed only at a portion of the periphery of the welding boss 111. For example, the second blocking groove 113 may be provided on the left or right side of the welding boss 111, while no second blocking groove 113 may be provided in other directions. The second blocking groove 113 may be continuous or intermittent. This arrangement is because in some electrical devices or varistors 12, it is only necessary to prevent moisture (liquid condensation) from penetrating in a specific direction, and it is not necessary to prevent moisture (liquid condensation) from penetrating in other directions.

[0067] Preferably, the second blocking groove 113 is generally annular, such as a circular ring, square ring, or irregular ring. The second blocking groove 113 can be either a closed annular structure or a discontinuous annular structure. A closed annular structure means that the ends of the second blocking groove 113 are connected to form a complete annular structure; a discontinuous annular structure means that the second blocking groove 113 includes several groove segments, with adjacent groove segments not connected, and multiple groove segments together forming an annular structure. It should be noted that since the multiple groove segments are not connected, there will be gaps between adjacent groove segments. To prevent moisture (liquid condensation) from seeping through these gaps, it is preferable that adjacent groove segments partially overlap, thus extending the capillary absorption path as much as possible. Of course, it is also possible that adjacent groove ends do not overlap, or that the second blocking groove 113 includes multiple annularly distributed groove segments forming a labyrinthine structure.

[0068] In this embodiment, the second blocking groove 113 is preferably a closed annular structure, which can completely block the capillary absorption path of moisture (liquid condensation).

[0069] The second blocking groove 113 can further prevent moisture (liquid condensation) from seeping through the gap between the housing 14 and the gasket 13 to the other electrode of the varistor 12, causing the varistor 12 to short-circuit. The principle is the same as that of the first blocking groove 112.

[0070] Example 3: Please refer to Figure 23 , Figure 24 As shown, Embodiment 3 of the present invention provides a surge protector 100, which is generally used in conjunction with a fuse and installed in a circuit system. It can discharge instantaneous overvoltage to the ground, limit the voltage across the device, and protect the electrical equipment.

[0071] The surge protector 100 includes a varistor assembly 10 as described in Embodiment 1 or Embodiment 2. In addition, the surge protector 100 also includes components such as a release spring and a release slider.

[0072] The end detached from the spring is low-temperature welded to the welding boss 111. The welding method can refer to existing technology.

[0073] The main improvement of the surge protector 100 mentioned in this embodiment is that a first blocking groove 112 is provided on the varistor electrode 11. Other structures are no different from the prior art. Structures not mentioned in the surge protector 100 can be referred to the prior art, and will not be described in detail here.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure-sensitive electrode, characterized in that, It includes an electrode body and a welding boss. The welding boss is disposed on the connection side of the electrode body. The connection side of the electrode body is provided with a first blocking groove, which blocks part or all of the directions around the welding boss.

2. The pressure-sensitive electrode according to claim 1, characterized in that, The first blocking groove surrounds the welding boss.

3. The pressure-sensitive electrode according to claim 2, characterized in that, The first blocking groove is in the form of a closed ring.

4. The pressure-sensitive electrode according to claim 2, characterized in that, The first blocking groove has an intermittent structure.

5. The pressure-sensitive electrode according to claim 1, characterized in that, The electrode body is provided with at least two first blocking grooves, and the at least two first blocking grooves are spaced apart around the welding boss.

6. A varistor assembly, characterized in that, Includes the pressure-sensitive electrode as described in claims 1-5.

7. The varistor assembly according to claim 6, characterized in that, The varistor assembly also includes a housing and a varistor, the varistor electrode is attached to the varistor, and the opening of the first blocking groove is closed to form a blocking cavity.

8. The varistor assembly according to claim 7, characterized in that, The varistor assembly also includes a gasket located between the varistor electrode and the housing, wherein the opening of the first blocking groove is closed by one side of the gasket.

9. The varistor assembly according to claim 8, characterized in that, At least one side of the gasket and the housing is provided with a second blocking groove.

10. The varistor assembly according to claim 9, characterized in that, The second blocking groove surrounds the welding boss.

11. The varistor assembly according to claim 10, characterized in that, The second blocking groove is in the form of a closed ring.

12. A surge protector, characterized in that, Includes the varistor assembly as described in claim 11.

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