Surge protector

Abstract

A surge protector includes a housing, a nonlinear element, a first wiring board, a second wiring board, and a thermal disengagement assembly. The nonlinear element includes a first pin and a second pin. The surge protector also includes a thermal disengagement assembly installed in the housing, including a spring and an indicator. The second pin is electrically connected to the second wiring board through the spring, the spring includes a movable portion and a fixed portion electrically connected to the second wiring board, the movable portion is welded to the second pin through a hot-melt welding portion, and the movable portion is laminated and fixed on the indicator in the thickness direction of the surge protector; the indicator is laminated and spaced in the thickness direction of the surge protector on the nonlinear element, and can move between a first position and a second position along the thickness direction of the surge protector. In the surge protector of the present application, the spring integrates multiple functions. The springs are laminated and fixed on the indicator and assembled into one to form a thermal disengagement assembly laminated on the nonlinear element. The laminated assembly reduces the difficulty of assembly.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a surge protector. Background Art

[0002] Surge protectors are mainly used in power supply systems to provide safety protection for various electronic equipment, instruments and meters, and communication lines. They are electronic devices connected in parallel to electrical circuits. When a spike current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protector can conduct and shunt the current in time to protect the equipment in the circuit from being damaged by the spike current or voltage.

[0003] Surge protectors generally have the function of conducting and shunting peak current or voltage, and need to have a thermal detachment indication function after exceeding the limit operation, so that users can find faults in time and replace products. In order to achieve these functions, nonlinear elements such as varistors or gas discharge tubes need to be placed inside the surge protector. The nonlinear element needs to be designed with two pins connected in parallel to the main circuit. When the nonlinear element is damaged by exceeding the limit operation, a thermal detachment indication is required. However, the connection structure between the nonlinear element and the main circuit of the surge protector in the prior art is relatively complex, with many solder joints and connection points, and the manufacturing process is complex and the production cost is high. Utility Model Content

[0004] The utility model aims to overcome at least one defect of the prior art and provide a surge protector.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A surge protector comprises a housing, a nonlinear element, a first wiring board and a second wiring board installed in the housing, wherein the nonlinear element comprises a first pin for being electrically connected to the first wiring board and a second pin for being electrically connected to the second wiring board, and the surge protector further comprises a thermal disengagement assembly installed in the housing, wherein the thermal disengagement assembly comprises a spring and a movable indicator, wherein the second pin is electrically connected to the second wiring board via the spring, the spring comprises a movable portion and a fixed portion electrically connected to the second wiring board, the movable portion is welded to the second pin via a heat-meltable welding portion, and the movable portion is laminated and fixed on the indicator in a thickness direction of the surge protector; the indicator is laminated and spaced in a thickness direction of the surge protector on the nonlinear element and can move between a first position and a second position in the thickness direction of the surge protector; after the welding portion is thermally melted, the movable portion is disengaged from the second pin under the action of the elastic force of the spring itself, and synchronously drives the indicator to switch from the first position to the second position in the thickness direction of the surge protector.

[0007] Optionally, the second pin is located on a side of the indicator away from the fixed part, one end of the movable part close to the fixed part is stacked and fixed with the indicator, the other end of the movable part away from the fixed part is stacked and welded on the second pin, and the side of the movable part facing the second pin is a welding surface opposite to and welded to the second pin.

[0008] Optionally, a limiting groove cooperating with the movable part is provided on the side of the indicator member facing the movable part, and the movable part is limited and fixed in the limiting groove.

[0009] Optionally, one end of the movable portion close to the fixed portion has a limiting shoulder that abuts against the outside of the limiting groove.

[0010] Optionally, the limiting groove has two symmetrically arranged limiting side walls, one ends of the two limiting side walls are spaced apart on the side of the indicator facing the movable part to form a limitation on the movable part in the width direction of the movable part, and the other ends of the two limiting side walls are bent in a direction approaching each other to form a limitation on the movable part in the thickness direction of the movable part between the side of the indicator facing the movable part.

[0011] Optionally, a slot is provided on the housing, and one end of the second wiring board abuts against the fixing portion of the spring sheet and is interference fixed in the slot.

[0012] Optionally, the fixing portion of the spring sheet is provided with a snap-in socket for snapping with the second wiring board, and one end of the second wiring board is snapped into the snap-in socket.

[0013] Optionally, the fixing portion includes a first clamping piece and a second clamping piece, one end of the second clamping piece is connected to one end of the first clamping piece, and the other end is bent and spaced apart from the first clamping piece to form the bayonet.

[0014] Optionally, the spring sheet further includes a straight middle portion connected between the movable portion and the fixed portion.

[0015] Optionally, the shell is provided with a raised guide column, the guide column has a first guide wall, the indicator is provided with a guide groove cooperating with the guide column, the guide groove has a second guide wall slidably cooperating with the first guide wall, and the first guide wall is inclined in a direction close to the fixed part of the spring piece and away from the movable part.

[0016] Optionally, an indication window is provided on the shell, and an indication mark is provided on the indication member; when the indication member is located at a first position, the indication mark is misaligned with the indication window; when the indication member is located at a second position, the indication mark is opposite to the indication window.

[0017] Optionally, the indicator is a U-shaped structure, the middle part of the U-shaped structure is stacked and spaced on the nonlinear element, the side of the middle part of the U-shaped structure facing the movable part is provided with a limiting groove that cooperates with the movable part to limit the position, and the side walls of the U-shaped structure on both sides form two extension parts extending downward, wherein the extension part close to the indication window is provided with an indication mark on the side facing the indication window.

[0018] Optionally, the second wiring board and the first wiring board are respectively located at two ends of the length direction of the surge protector, the direction from the second wiring board to the first wiring board is the length direction of the surge protector, and the length direction of the spring sheet is set along the length of the surge protector; the nonlinear element is located in the middle of the surge protector, between the second wiring board and the first wiring board, the nonlinear element, the indicator and the spring sheet are stacked in the thickness direction of the surge protector, and the length direction of the indicator is set along the height of the surge protector.

[0019] In the surge protector of the utility model, the spring piece serves as a conductive piece electrically connecting the nonlinear element and the second wiring board to realize the thermal separation function of the surge protector, and drives the indicating piece during the thermal separation. The spring piece integrates multiple functions in one, greatly reduces the number of parts and electrical connection points of the surge protector, effectively improves reliability and production efficiency, and reduces manufacturing costs. The spring pieces are stacked and fixed on the indicating piece and assembled into one body to form a thermal separation component stacked on the nonlinear element. The stacked assembly reduces the difficulty of assembly, and the assembly method is simple and convenient.

[0020] In addition, the fixing portion is designed to have a bending feature so that it can achieve a solder-free elastic snap connection when in contact with the second wiring board, which not only improves the reliability of electrical conduction, but also reduces manufacturing costs and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the utility model surge protector;

[0022] Figure 2 This is a view of the utility model surge protector with the upper cover removed;

[0023] Figure 3 It is a three-dimensional diagram of the utility model surge protector without the upper cover;

[0024] Figure 4 It is a three-dimensional diagram of the surge protector after thermal separation of the utility model without the upper cover;

[0025] Figure 5 It is an assembly diagram of the spring piece and the indicator of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the shrapnel of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the indicator of the utility model;

[0028] Figure 8 It is an assembly diagram of the upper cover and the indicator of the utility model;

[0029] Fig. 9 It is a structural schematic diagram of the upper cover of the utility model;

[0030] Fig.10 It is a schematic diagram of step a in the assembly process of the utility model;

[0031] Fig.11 It is a schematic diagram of step d in the assembly process of the utility model;

[0032] Fig.12 It is a schematic diagram of step e in the assembly process of the utility model;

[0033] Fig.13 It is a schematic diagram of step g in the assembly process of the utility model.

[0034] Base 1; slot 10; limiting portion 11; indicating window 12; nonlinear element 2; first pin 21; second pin 22; spring piece 3; movable portion 31; welding surface 311; limiting boss 312; straight middle portion 32; fixing portion 33; bayonet 331; first clamping piece 332; arc section 333; first inclined section 334; second inclined section 335; second clamping piece 336; indicating member 4; limiting groove 41; limiting side wall 411; indicating mark 42; extension portion 43; guide groove 44; second guide wall 441; first terminal block 5; second terminal block 6; internal connection end 61; external connection end 62; upper cover 7; guide column 71; first guide wall 711; first terminal block 8; second terminal block 9. DETAILED DESCRIPTION

[0035] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the surge protector of the utility model. The surge protector of the utility model is not limited to the description of the following embodiments.

[0036] like Figure 1-Figure 2As shown, the surge protector of this embodiment includes a housing and a nonlinear element 2, a first wiring board 5, and a second wiring board 6 installed in the housing. The housing includes a base 1 and an upper cover 7 that cover each other. The surge protector is connected in parallel to the main circuit through the first wiring board 5 and the second wiring board 6. The first wiring board 5 and the second wiring board 6 are installed on both sides of the housing. The two sides of the housing are provided with wiring ports corresponding to the first wiring board 5 and the second wiring board 6. Among them, the first wiring board 5 is assembled into a whole with the first wiring seat 8 and the first wiring screw to form a first wiring terminal; the second wiring board 6 is assembled into a whole with the second wiring seat 9 and the second wiring screw to form a second wiring terminal. The first wiring terminal and the second wiring terminal are both standard wiring terminal structures, and other wiring terminal structures can also be used. This is a prior art and will not be repeated here.

[0037] like Figure 1-Figure 4 As shown, the surge protector of this embodiment also includes a thermal detachment assembly installed in the housing, the thermal detachment assembly includes a spring 3 and a movable indicator 4, the nonlinear element 2 of this embodiment is a varistor, including a first pin 21 for electrically connecting to a first wiring board 5 and a second pin 22 for electrically connecting to a second wiring board 6, the first pin 21 is electrically connected to the first wiring board 5 by spot welding or soldering, the second pin 22 is electrically connected to the second wiring board 6 by the spring 3, the spring 3 includes a movable part 31 and a fixed part 33 electrically connected to the second wiring board 6, the movable part 31 is welded to the second pin 22 by a heat-meltable welding part, the movable part 31 is laminated and fixed on the indicator 4; the indicator 4 is laminated and spaced on the nonlinear element 2, and can move between a first position and a second position. After the welding part is thermally melted, the movable part 31 is detached from the second pin 22 under the action of the elastic force of the spring 3 itself, and synchronously drives the indicator 4 to switch from the first position to the second position. In the surge protector of this embodiment, the spring piece 3 is used as a conductive member electrically connecting the nonlinear element 2 and the second wiring board 6 to realize the thermal disengagement function of the surge protector, and drives the indicator 4 during thermal disengagement. The spring piece 3 integrates multiple functions in one, greatly reducing the number of parts and electrical connection points of the surge protector, effectively improving reliability and production efficiency, and reducing manufacturing costs. The spring piece 3 is stacked and fixed on the indicator 4 to form a thermal disengagement component stacked on the nonlinear element 2. The stacked assembly reduces the difficulty of assembly, and the assembly method is simple and convenient. Of course, the nonlinear element 2 of this embodiment can also be a gas discharge tube, etc. It should be noted that the movable part 31 and the second pin 22 are welded by low-temperature solder wire to form a heat-meltable welding part between the movable part 31 and the second pin 22.

[0038] by Figure 2For example, the up-down direction in the figure is the height direction of the surge protector, the left-right direction is the length direction of the surge protector, and the direction perpendicular to the drawing is the thickness direction (also called the width direction) of the surge protector. In this embodiment, the second wiring board 6 and the first wiring board 5 are respectively located at the two ends of the length direction of the surge protector, and the direction from the second wiring board 6 to the first wiring board 5 is the length direction of the surge protector. The length direction of the spring 3 is set along the length of the surge protector; the nonlinear element 2 is located in the middle of the surge protector, between the second wiring board 6 and the first wiring board 5, and the nonlinear element 2, the indicator 4 and the spring 3 are stacked in the thickness direction of the surge protector. The length direction of the indicator 4 is set along the height of the surge protector. After the welding part is hot-melted, the movable part 31 is separated from the second pin 22 under the action of the elastic force of the spring 3 itself, and the indicator 4 is synchronously driven to move in the thickness direction of the surge protector, switching from the first position to the second position. The cooperation between the indicator 4 and the spring 3 of this embodiment allows the indicator 4 to move in the thickness direction, which can reduce the difficulty of assembly compared to moving in the length direction. It is only necessary to install the nonlinear element 2 and the first wiring board 5 in the shell base 1 along the thickness direction, and then install the movable part 31 of the spring 3 into a thermal separation assembly in the shell base 1 along the thickness direction so that the movable part 31 corresponds to the second pin 22. After pressing the movable part 31 in the thickness direction, the movable part 31 and the second pin 22 are welded with low-temperature solder wire. There is no need to compress in the length direction to control the movable part 31 to correspond to the second pin 22 like the spring or spring of the existing driving indicator 4, which greatly improves the assembly efficiency; and it can be basically a straight sheet structure, which simplifies the structure of the spring 3.

[0039] like Figure 1-Figure 2 As shown in the figure, in this embodiment, the matching structure between the movable part 31, the indicator 4 and the second pin 22, the second pin 22 is located on the side of the indicator 4 away from the fixed part 33, the end of the movable part 31 close to the fixed part 33 is laminated and fixed to the indicator 4, the other end of the movable part 31 away from the fixed part 33 is laminated and welded to the second pin 22, and the side of the movable part 31 facing the second pin 22 is a welding surface 311 opposite to and welded to the second pin 22. Figure 3 In the surge protector in the normal state shown in FIG. 1 , the welding surface 311 of the spring 3 is welded to the second pin 22 of the nonlinear element 2 through a welding portion; Figure 4As shown, when the nonlinear element 2 is heated by the fault current / voltage, the welding part is melted by heat, and the movable part 31 of the spring 3 moves upward under the elastic force of the spring 3 to separate the welding surface 311 from the second pin 22 of the nonlinear element 2. At the same time, since the movable part 31 of the spring 3 is fixedly connected to the indicator 4, the movable part 31 will drive the indicator 4 to rotate to realize the fault indication. The side of the indicator 4 away from the fixed part 33 turns upward, and the other side of the indicator 4 close to the fixed part 33 turns downward, that is, the movable part 31 of the spring 3 drives the indicator 4 to rotate a certain angle in the thickness direction of the surge protector with the fixed part 33 as the rotation center. The layout is compact and reasonable, and the structure is simplified. As another embodiment, the indicator 4 can also be arranged so that the movable part 31 of the spring 3 drives the indicator 4 to move linearly in the thickness direction of the surge protector.

[0040] like Figure 7-Figure 9 As shown, in this embodiment, the guiding structure for the movement of the indicator 4 is provided with a downwardly protruding guide column 71 on the upper cover 7 of the shell, and the guide column 71 has a first guide wall 711. The indicator 4 is provided with a guide groove 44 that cooperates with the guide column 71, and the guide groove 44 has a second guide wall 441 that slides with the first guide wall 711. The first guide wall 711 is inclined in the direction close to the fixed part 33 of the spring 3 and away from the movable part 31. The first guide wall 711 and the second guide wall 441 are preferably arc-shaped side walls. The first guide wall 711 inclinedly set by the guide column 71 slides with the second guide wall 441 of the guide groove 44, which plays a guiding role in the movement of the indicator 4. The indicator 4 can stably and reliably flip and switch positions after thermal separation, thereby improving the reliability of fault indication.

[0041] like Figure 4 and Figure 5 As shown, the spring piece 3 of this embodiment is an integrally formed structure, and further comprises a straight middle portion 32 connected between the movable portion 31 and the fixed portion 33. The spring piece 3 is extremely simple, easy to manufacture, and convenient to assemble.

[0042] like Figure 5-Figure 7As shown, in the stacked fixing structure between the spring piece 3 and the indicator 4 of this embodiment, a limiting groove 41 is provided on the side of the indicator 4 facing the movable part 31, which is limited and matched with the movable part 31, and the movable part 31 is limited and fixed in the limiting groove 41. Specifically, the limiting groove 41 has two symmetrically arranged limiting side walls 411, one end of the two limiting side walls 411 is arranged at intervals on the side of the indicator 4 facing the movable part 31 to form a limit for the movable part 31 in the width direction of the movable part 31, and the other ends of the two limiting side walls 411 are bent in a direction close to each other to form a limit for the movable part 31 in the thickness direction of the movable part 31 between the side facing the movable part 31. The limiting side wall 411 is preferably an inverted L-shaped structure. Further, the end of the movable part 31 close to the fixed part 33 has a limiting boss 312 that abuts against the outside of the limiting groove 41. The movable portion 31 has two limiting bosses 312 on both sides, which cooperate with one end of the two limiting side walls 411 in the length direction of the movable portion 31 to prevent the movable portion 31 from falling out of the limiting groove 41 when the spring piece 3 and the indicator 4 move after thermal separation, thereby improving the reliability of the action and also playing a role of stopping and positioning when the movable portion 31 is inserted into the limiting groove 41. As another embodiment, the indicator 4 can also be provided with a corresponding limiting hole, and the movable portion 31 of the spring piece 3 passes through the limiting hole to form a fixed connection structure.

[0043] The connection structure between the spring piece 3 and the second wiring board 6 of this embodiment is as follows: Figure 1 As shown, one end of the second wiring board 6 is an internal connection terminal 61 for electrically connecting to the fixing portion 33 of the spring 3, and the other end of the second wiring board 6 is an external connection terminal 62 for external connection, and the internal connection terminal 61 and the external connection terminal 62 are connected in an L shape.

[0044] like Figure 1 and Figure 6As shown, the fixing portion 33 of the spring sheet 3 includes a first clamping piece 332 and a second clamping piece 336. One end of the second clamping piece 336 is integrally connected to one end of the first clamping piece 332, and the other end is bent and spaced from the first clamping piece 332 to form a bayonet 331. The fixing portion 33 is designed to have a bending feature so that it can achieve a solder-free elastic clamping when in contact with the second wiring board 6, which not only improves the reliability of electrical conduction, but also reduces manufacturing costs and improves processing efficiency. Specifically, the first clamping piece 332 is perpendicular to the length direction of the spring piece 3; the second clamping piece 336 is a bending structure, including an arc segment 333, a first inclined segment 334 and a second inclined segment 335 connected in sequence, wherein the arc segment 333 is connected to the first clamping piece 332, the first inclined segment 334 is inclined in a direction away from the first clamping piece 332, and the second inclined segment 335 is inclined in a direction close to the first clamping piece 332, thereby forming a narrow entrance and a wide bottom of the bayonet 331, which is convenient for elastic clamping with the second wiring board 6, and the connection is firm and not easy to fall out.

[0045] like Figure 1 and Figure 6 As shown, a card slot 10 is provided on the base 1 of the housing, and the card slot 10 has two opposite side walls, which are an extrusion portion and a limiting portion 11. The fixing portion 33 of the spring sheet 3 is placed in the card slot 10, and the outer side of the first clamping piece 332 of the fixing portion 33 abuts against the limiting portion 11. In this embodiment, there are two ways of connecting the spring sheet 3 and the second wiring board 6. The first connection method is that the inner connection end 61 of the second wiring board 6 and the fixing portion 33 are interference-fixed in the card slot 10, so that the inner connection end 61 abuts against the outer side of the second clamping piece 336 of the fixing portion 33 to achieve electrical connection, that is, the inner connection end 61 of the second wiring board 6 is inserted between the second clamping piece 336 of the fixing portion 33 and the extrusion portion of the card slot 10. The second connection method is that the inner connection end 61 of the second wiring board 6 is inserted into the bayonet 331, that is, the inner connection end 61 of the second wiring board 6 is inserted between the first clamping piece 332 and the second clamping piece 336 of the fixing portion 33. Of course, the spring piece 3 and the second wiring board 6 can also be bent flat plate structures, connected by welding, riveting and the like.

[0046] like Figure 1 and Figure 7 As shown, in the indicating structure of the indicating member 4 in this embodiment, the base 1 of the housing is provided with an indicating window 12, and the indicating member 4 is provided with an indicating mark 42 of a different color from the indicating member 4. Figure 3 As shown, when the indicator 4 is in the first position, the indicator mark 42 is misaligned with the indicator window 12, that is, the color of the indicator mark 42 cannot be seen, and the color of the indicator 4 can be seen from the indicator window 12; Figure 4As shown, when the indicator 4 is in the second position, the indicator mark 42 is opposite to the indicator window 12, that is, the color of the indicator mark 42 can be seen from the indicator window 12. The position change of the indicator 4 is displayed by different colors to realize the fault indication function, which is simple and intuitive. Preferably, the color of the indicator 4 is green and the indicator mark 42 is red. Of course, the indicator mark 42 can also be other colors, words, symbols, patterns, etc., or a combination of colors, words, symbols, patterns, etc.

[0047] Specifically, the indicator 4 is a U-shaped structure, the middle part of the U-shaped structure is stacked and spaced on the nonlinear element 2, and a limiting groove 41 that cooperates with the movable part 31 is provided on the side of the middle part of the U-shaped structure facing the movable part 31. The side walls of the U-shaped structure on both sides form two extension parts 43 extending downward, and the extension part 43 close to the indication window 12 is provided with an indication mark 42 on the side facing the indication window 12.

[0048] like Figure 10-13 As shown, the assembly method of the surge protector of this embodiment is used for the surge protector of the utility model, the shell of the surge protector includes a base 1 and an upper cover 7 that cover each other in the thickness direction, and includes the following steps:

[0049] a. The second wiring board 6, the nonlinear element 2, and the first wiring board 5 are installed in the base 1;

[0050] b. The active portion 31 of the shrapnel 3 is laminated and fixed on the indicator 4 to form a thermal separation assembly;

[0051] c. The thermal release assembly is installed in the base 1 along the thickness direction and is stacked and spaced on the nonlinear element 2, and the movable portion 31 corresponds to the second pin 22 of the nonlinear element 2, and the fixed portion 33 is placed in the slot 10 of the base 1 and abuts against the limiting portion 11;

[0052] d. Use low-temperature solder to weld the active portion 31 of the spring 3 in the thermal separation assembly to the second pin 22 of the nonlinear element 2;

[0053] e. Press the movable portion 31 along the thickness direction to insert the inner end 61 of the second terminal block 6 into the fixed portion 33 of the spring 3 in the thermal disengagement assembly and the side wall (extrusion portion) of the slot 10 opposite to the fixed portion 33;

[0054] f. Using solder to weld the first terminal plate 5 to the first pin 21 of the nonlinear element 2;

[0055] g. Close the upper cover 7 on the base 1.

[0056] The order of some of the above steps can be changed. For example, the second wiring board 6 can be placed in the base 1 in a separate process in step e instead of being placed in the base 1 in step a. Step a is before step b or step b is before step a. Step d is before step e or step e is before step d. Step f is before step a or after step a and before step g, that is, firstly install the nonlinear element 2 and the first wiring board 5 in the base 1 respectively, and then weld the first wiring board 5 to the first pin 21; or, firstly weld the first wiring board 5 to the first pin 21 of the nonlinear element 2, and then install the welded first wiring board 5 and the nonlinear element 2 in the base 1. Both are possible.

[0057] Before assembling the surge protector, there is assembly preparation work, which includes separating the base 1 and the upper cover 7 that cover each other, and placing the base 1 on the assembly station.

[0058] The assembly method of the surge protector of the utility model has few steps and simple assembly, and all of them are stacked assembly, which is easy to realize automation and improve efficiency.

[0059] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0060] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A surge protector, comprising a housing and a nonlinear element (2), a first wiring board (5), and a second wiring board (6) installed in the housing, wherein the nonlinear element (2) comprises a first pin (21) for electrically connecting to the first wiring board (5) and a second pin (22) for electrically connecting to the second wiring board (6), characterized in that: The surge protector further comprises a thermal disengagement assembly installed in the housing, the thermal disengagement assembly comprising a spring sheet (3) and a movable indicator (4); the second pin (22) is electrically connected to the second wiring board (6) via the spring sheet (3); the spring sheet (3) comprises a movable portion (31) and a fixed portion (33) electrically connected to the second wiring board (6); the movable portion (31) is welded to the second pin (22) via a heat-meltable welding portion; the movable portion (31) is laminated and fixed on the indicator (4) in the thickness direction of the surge protector; the indicator (4) is laminated and spaced in the thickness direction of the surge protector on the nonlinear element (2) and can move between a first position and a second position in the thickness direction of the surge protector; after the welding portion is thermally melted, the movable portion (31) is disengaged from the second pin (22) under the action of the elastic force of the spring sheet (3) itself, and synchronously drives the indicator (4) to switch from the first position to the second position in the thickness direction of the surge protector.

2. The surge protector according to claim 1, characterized in that: The second pin (22) is located on a side of the indicator (4) away from the fixed portion (33); one end of the movable portion (31) close to the fixed portion (33) is laminated and fixed to the indicator (4); the other end of the movable portion (31) away from the fixed portion (33) is laminated and welded to the second pin (22); and the side surface of the movable portion (31) facing the second pin (22) is a welding surface (311) that is opposite to and welded to the second pin (22).

3. The surge protector according to claim 1 or 2, characterized in that: A limiting groove (41) which cooperates with the movable part (31) to limit the position of the movable part (31) is provided on the side of the indicator (4) facing the movable part (31); the movable part (31) is fixed in the limiting groove (41).

4. The surge protector according to claim 3, characterized in that: One end of the movable portion (31) close to the fixed portion (33) has a limiting shoulder (312) that abuts against the outside of the limiting groove (41).

5. The surge protector according to claim 3, characterized in that: The limiting groove (41) has two limiting side walls (411) that are symmetrically arranged, one end of the two limiting side walls (411) being arranged at intervals on the side of the indicator (4) facing the movable part (31) to limit the movable part (31) in the width direction of the movable part (31), and the other ends of the two limiting side walls (411) are bent in a direction approaching each other to form a limit on the movable part (31) in the thickness direction of the movable part (31) between the side of the indicator (4) facing the movable part (31).

6. The surge protector according to claim 1, characterized in that: The housing is provided with a slot (10), and one end of the second wiring board (6) abuts against a fixing portion (33) of the spring sheet (3) and is interference fixed in the slot (10).

7. The surge protector according to claim 1, characterized in that: The fixing portion (33) of the spring sheet (3) is provided with a snap-in opening (331) for snapping with the second wiring board (6), and one end of the second wiring board (6) is snapped into the snap-in opening (331).

8. The surge protector according to claim 7, characterized in that: The fixing portion (33) comprises a first clamping piece (332) and a second clamping piece (336); one end of the second clamping piece (336) is connected to one end of the first clamping piece (332), and the other end is bent and spaced from the first clamping piece (332) to form the bayonet (331).

9. The surge protector according to claim 1, characterized in that: The spring piece (3) further comprises a straight middle portion (32) connected between the movable portion (31) and the fixed portion (33).

10. The surge protector according to claim 1, characterized in that: The shell is provided with a raised guide column (71), the guide column (71) has a first guide wall (711), the indicator (4) is provided with a guide groove (44) matched with the guide column (71), the guide groove (44) has a second guide wall (441) slidably matched with the first guide wall (711), and the first guide wall (711) is inclined in a direction close to the fixed part (33) of the spring sheet (3) and away from the movable part (31).

11. The surge protector according to claim 1, characterized in that: The housing is provided with an indication window (12), and the indicating member (4) is provided with an indication mark (42); when the indicating member (4) is located at a first position, the indication mark (42) and the indication window (12) are misaligned; when the indicating member (4) is located at a second position, the indication mark (42) and the indication window (12) are opposite.

12. The surge protector according to claim 11, characterized in that: The indicator (4) is a U-shaped structure, the middle part of the U-shaped structure is stacked and arranged at intervals on the nonlinear element (2), a limiting groove (41) is provided on the side of the middle part of the U-shaped structure facing the movable part (31) and is matched with the movable part (31) in a limiting manner, and two side walls of the U-shaped structure form two extending parts (43) extending downward, wherein the extending part (43) close to the indicating window (12) is provided with an indicating mark (42) on the side facing the indicating window (12).

13. The surge protector according to claim 1, characterized in that: The second wiring board (6) and the first wiring board (5) are respectively located at two ends of the length direction of the surge protector, the direction from the second wiring board (6) to the first wiring board (5) is the length direction of the surge protector, and the length direction of the spring sheet (3) is arranged along the length of the surge protector; the nonlinear element (2) is located in the middle of the surge protector, between the second wiring board (6) and the first wiring board (5), the nonlinear element (2), the indicator (4) and the spring sheet (3) are stacked in the thickness direction of the surge protector, and the length direction of the indicator (4) is arranged along the height of the surge protector.

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