Miniature surge protection device module box and surge protection device

Abstract

The utility model provides a miniature surge protection device module box. The small surge protection device module box comprises a shell, a piezoresistor, an elastic recovery piece, a thermal tripping piece, a telecommand rod and a first electric connecting piece, the first end of the elastic recovery piece is fixedly arranged in the shell, the second end of the elastic recovery piece is connected with the first end of the thermal tripping piece, and the telecommand rod is arranged in the shell in a swinging mode and is in lap joint with the second end of the thermal tripping piece. The thermal tripping piece is connected with the piezoresistor and the first electric connecting piece through low-temperature tin soldering, when the temperature of the piezoresistor exceeds a fusing temperature threshold value of the low-temperature tin soldering, the thermal tripping piece is disconnected with the piezoresistor and the first electric connecting piece, the elastic recovery piece drives the thermal tripping piece to move, the thermal tripping piece is pulled out of the first electric connecting piece, and the thermal tripping piece is disconnected from the first electric connecting piece. And the remote signaling rod loses a lap joint fulcrum and thus swings. According to the small surge protection device module box provided by the utility model, the internal structure is exquisite and matched, the lightening and thinning of the surge protection device module box are realized, and the occupation of the installation space is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection, in particular to a small-sized surge protector module box and a surge protector. Background Art

[0002] SPD, or surge protector, is also called lightning arrester. It is an electronic device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. In a low-voltage power distribution system, 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 in a very short time, such as overvoltage caused by lightning, thereby avoiding damage to other equipment in the circuit caused by the surge. The SPD surge protector can discharge lightning current and protect electrical equipment from lightning strikes. The surge protector generally includes a surge protector base and a surge protector module box that can be plugged into the surge protector base. The existing surge protector module box is mostly 18mm thick, which occupies a large installation space and is not conducive to use in micro power supply circuits. Summary of the invention

[0003] In view of this, the utility model aims to provide a small surge protector module box with a small thickness and reduced space occupation.

[0004] In order to achieve the purpose of the utility model, a small surge protector module box is provided. The small surge protector module box includes a shell, a varistor, an elastic return member, a thermal release member, a remote signaling rod and a first electrical connector. The first end of the elastic return member is fixedly arranged in the shell, and the second end is connected to the first end of the thermal release member. The remote signaling rod is swingably arranged in the shell and overlaps with the second end of the thermal release member. The thermal release member is respectively connected to the varistor and the first electrical connector by low-temperature soldering. When the temperature of the varistor exceeds the low-temperature soldering melting temperature threshold, the thermal release member is disconnected from the varistor and the first electrical connector, the elastic return member drives the thermal release member to move, the thermal release member is withdrawn from the first electrical connector, and the remote signaling rod loses the overlapping fulcrum and thus swings.

[0005] Optionally, the surge protector module box further comprises a fire extinguishing box. The fire extinguishing box is coated on the second end of the thermal release component. The interior of the fire extinguishing box is filled with a cooling material.

[0006] Optionally, the remote signaling rod comprises a rotating shaft, a tail rod, an elastic support end and an overlap end. The rotating shaft is rotatably arranged in the shell. The elastic support end and the overlap end are the two ends of the remote signaling rod respectively. The elastic support end elastically abuts in the shell. The overlap end can swing with the rotating shaft as the axis. The overlap end overlaps the second end of the thermal release part. The tail rod extends outward through the shell and abuts against the external remote signaling circuit.

[0007] Optionally, the thermal release component includes an indicator sheet and a pin sheet. The pin sheet includes a pivot end and a terminal end. The indicator sheet and the pivot end of the pin sheet are pivotally connected to each other. The pin sheet is sequentially inserted into the varistor and the first electrical connector, and is connected to the varistor and the first electrical connector by low-temperature soldering. The overlapping end of the remote signal rod overlaps the terminal end of the pin sheet. The elastic return member is connected to the indicator sheet. A degradation indicator mark is provided on the indicator sheet. An indicator window is provided on the housing. When the elastic return member is reset to drive the thermal release component to move, the degradation indicator mark moves to a position corresponding to the indicator window.

[0008] Optionally, a first electrode sheet and a second electrode sheet are provided on the varistor. The first electrode sheet is fixedly attached to the first surface of the varistor, and one end extends out of the varistor and is bent to form a welding folding plate. A first through hole is provided on the welding folding plate. A second through hole is provided on the first electrical connector. The pin sheet passes through the first through hole and the second through hole in sequence, and is connected to the welding folding plate and the first electrical connector by low-temperature soldering. The fire extinguishing box is covered on the outside of the connection between the pin sheet, the welding folding plate and the first electrical connector. The second electrode sheet is fixedly attached to the second surface of the varistor.

[0009] Optionally, the small surge protector module box further includes a second electrical connector. The first electrical connector is an electrical input terminal. The second electrical connector is an electrical output terminal. The first electrical connector and the second electrical connector are respectively fixedly arranged on the housing. The second electrical connector is integrally bent and formed with the second electrode sheet.

[0010] Optionally, the small surge protector module box further comprises a cover. The cover is interlocked with the housing to accommodate the varistor, the elastic recovery member and the thermal release member. The housing is further provided with first protrusions arranged in an array. The inner side of the cover is provided with second protrusions arranged in an array. The first surface of the varistor abuts against the second protrusion. The second surface of the varistor abuts against the first protrusion.

[0011] Optionally, a partition is further provided in the shell. The inner cavity of the shell is divided into a first inner cavity and a second inner cavity. The varistor is arranged in the first inner cavity. The thermal release member and the elastic recovery member are arranged in the second inner cavity. The partition is provided with a bending portion. The indicator sheet is made of a flexible material. The pin sheet is made of a metal material. When the elastic recovery member drives the thermal release member to move, the indicator sheet is bent and moves in contact with the bending portion.

[0012] Optionally, a convex column is further provided in the housing. A hanging hole is provided at one end of the indicator sheet. The first end of the elastic recovery member is sleeved on the convex column, and the second end of the elastic recovery member is hung in the hanging hole of the indicator sheet. The initial state of the elastic recovery member is a stretched state.

[0013] The utility model also provides a surge protector. The surge protector comprises a surge protector base and the aforementioned small surge protector module box, wherein a remote signaling circuit is provided in the surge protector base, a micro switch is provided on the remote signaling circuit, the small surge protector module box is pluggably connected to the surge protector base through a first electrical connector and a second electrical connector, and the remote signaling rod of the small surge protector module box abuts against the micro switch.

[0014] The utility model provides a small surge protector module box, which uses low-temperature soldering to fix the varistor and the first electrical connector. When the varistor heats up, the solder can be quickly melted, and the elastic recovery member drives the thermal release member to move, and the degradation indicator on the thermal release member moves to the indication window for near-end indication. At the same time, the remote signaling rod loses the lap fulcrum and swings, thereby disconnecting the connection with the remote signaling circuit, and realizing the function of remotely alarming the user. The small surge protector module box provided by the utility model has a sophisticated internal structure, which realizes the lightness and thinness of the surge protector module box and reduces the installation space occupied. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present utility model, rather than limiting the present utility model.

[0016] Figure 1 A schematic structural diagram of a surge protector provided in one embodiment of the utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the remote signal circuit board and the micro switch in the surge protector.

[0018] Figure 3A schematic structural diagram of a small surge protector module box provided in one embodiment of the utility model.

[0019] Figure 4 for Figure 3 A schematic structural diagram of the cover body in the surge protector module box.

[0020] Figure 5 for Figure 3 A schematic structural diagram of the shell in the surge protector module box.

[0021] Figure 6 for Figure 3 A schematic diagram of the planar structure of the interior of the surge protector module box in one state.

[0022] Figure 7 for Figure 3 A schematic diagram of the planar structure of the surge protector module box in a state where no fire extinguishing box is contained therein.

[0023] Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure of the surge protector module box in this state without a fire extinguishing box.

[0024] Fig. 9 for Figure 3 A schematic structural diagram of the thermal release component in the surge protector module box.

[0025] Fig.10 for Figure 3 A schematic diagram of the planar structure of the surge protector module box in another state where the interior of the surge protector module box does not contain a fire extinguishing box.

[0026] Fig.11 for Fig.10 A schematic diagram of the three-dimensional structure of the surge protector module box in this state without a fire extinguishing box.

[0027] Fig.12 for Figure 3 A schematic structural diagram of the remote signaling rod in the surge protector module box.

[0028] Fig.13 for Figure 3 A plan view of the surge protector module box in one state.

[0029] Fig.14 for Fig.13 A cross-sectional view of the surge protector module box along line AA.

[0030] Fig.15 for Figure 3 A plan view of the surge protector module box in another state.

[0031] Fig.16 for Fig.15 A cross-sectional view of the surge protector module box along line A'-A'. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0033] See also Figure 1-3 A surge protector 999 is provided in one embodiment of the utility model. The surge protector 999 includes a surge protector base 998 and a small surge protector module box 997 provided in one embodiment of the utility model. A remote signal circuit board 9981 is provided in the surge protector base 998, and a micro switch 9982 is provided on the remote signal circuit board 9981, and the micro switch 9982 is electrically connected to an external power supply. The surge protector module box 997 can be plugged into the surge protector base 998 and abut against the micro switch 9982. The surge protector 999 discharges current to the ground when there is a lightning strike or system overvoltage to protect the electrical appliances in the circuit. The small surge protector module box 997 provided by the utility model has a single-pole width of 9mm±0.5mm, or a single-pole width of 12mm±0.5mm, and is small in size, which can reduce the space occupied by the installation. In this embodiment, four surge protector module boxes 997 are connected together and plugged into a surge protector base 998 .

[0034] See also Figure 2-6The surge protector module box 997 includes a cover 100, a shell 200, an elastic recovery member 300, a varistor 400, a thermal release member 500, a remote signal rod 600, a first electrical connector 700, a second electrical connector 800 and a fire extinguishing box 900. The cover 100 and the shell 200 are interlocked to accommodate the elastic recovery member 300, the varistor 400 and the thermal release member 500. The first end 310 of the elastic recovery member 300 is fixedly arranged in the shell 200, and the second end 320 is connected to the first end 501 of the thermal release member 500. The initial state of the elastic recovery member 300 is a stretched state. The second end 502 of the thermal release member 500 is inserted into the first electrical connector 700. The remote signal rod 600 is swingably arranged in the shell 200 and overlaps with the second end 502 of the thermal release member 500. One end of the remote signal rod 600 extends outward through the shell 200 and abuts against the micro switch 9982 on the remote signal circuit board 9981 in the surge protector base 998. The first electrical connector 700 and the second electrical connector 800 are fixedly arranged on the shell 200 and are located below the varistor 400. The surge protector module box 997 is pluggably connected to the surge protector base 998 through the first electrical connector 700 and the second electrical connector 800. The first electrical connector 700 is an electrical input terminal, and the second electrical connector 800 is an electrical output terminal. The thermal release component 500 is respectively connected to the varistor 400 and the first electrical connector 700 by low-temperature soldering. Figure 7 As shown, points A and B are two low-temperature soldering points. The fire extinguishing box 900 is coated on the second end 502 of the thermal release part 500. The fire extinguishing box 900 is filled with cooling material. When a lightning strike or system overvoltage occurs, the temperature of the varistor 400 rises. When the temperature of the varistor 400 exceeds the low-temperature solder melting temperature threshold, the low-temperature tin melts, the thermal release part 500 is disconnected from the varistor 400 and the first electrical connector 700, the elastic recovery part 300 is reset, and the thermal release part 500 is driven to move. The thermal release part 500 is pulled out of the first electrical connector 700, and the remote signal rod 600 loses the lap fulcrum and swings, so that the remote signal rod 500 is disconnected from the micro switch 9982, and a remote signal alarm signal is issued. After receiving the alarm signal, the user can deal with the surge protector 999 in time. In this embodiment, the elastic recovery part 300 is a tension spring. The cooling material in the fire extinguishing box 900 is quartz sand. The low-temperature tin melts, and the cooling material in the fire extinguishing box covers the welding point to extinguish the arc and cool down the melted part in time.

[0035] See also Figure 4-6, the inner side surface 101 of the cover body 100 is provided with second protrusions 110 arranged in an array. The second protrusions 110 are used to support and abut the varistor 400, so as to facilitate the heat dissipation of the varistor 400. The shell 200 is a rectangular parallelepiped structure with an opening, which is interlocked with the cover body 100, and accommodates the varistor 400, the elastic recovery member 300 and the thermal release member 500. The shell 200 is provided with a protruding column 210, a partition 220 and a first protruding point 230. The protruding column 210 extends from the inner side surface 201 of the shell 200 toward the cover body 100. The first end 310 of the elastic recovery member 300 is sleeved on the protruding column 210. The partition 220 extends from the inner side surface 201 of the shell 200 toward the cover body 100, and divides the inner cavity of the shell into a first inner cavity 240 and a second inner cavity 250. The varistor 400 is arranged in the first inner cavity 240. The elastic recovery member 300 and the thermal release member 500 are arranged in the second inner cavity 250. The partition 220 is provided with a bending portion 221. The first protrusions 230 are arranged in an array in the first inner cavity 240 of the housing 200, and are used to support and abut the varistor 400, so as to facilitate the heat dissipation of the varistor 400. The upper side of the housing 200 is also provided with an indication window 260. The housing 200 is also provided with a remote signal rod mounting hole 270. The remote signal rod 600 is rotatably mounted in the remote signal rod mounting hole 270.

[0036] See also Figure 5-6 , a first electrode sheet 410 is provided on the first surface 401 of the varistor 400. A second electrode sheet 420 is provided on the second surface (not shown in the figure) of the varistor 400. Among them, the first surface 401 and the second surface of the varistor 400 are opposite surfaces. The first electrode sheet 410 is fixedly attached to the first surface 401 of the varistor 400, and one end extends out of the varistor 400 and is bent to form a welding folding plate 411. A first through hole 4111 is provided on the welding folding plate 411. A second through hole 710 is provided on the first electrical connector 700. The second end 520 of the thermal release member 500 passes through the first through hole 4111 and the second through hole 710 in sequence, and is connected to the welding folding plate 411 and the first electrical connector 700 by low-temperature soldering. The fire extinguishing box 900 is coated on the outside of the low-temperature soldering connection. The second electrode sheet 420 is fixedly attached to the second surface of the varistor 400. The second electrode sheet 420 and the second electrical connector 800 are integrally bent and formed. The first surface 401 of the varistor 400 abuts against the second protrusion 110 in the cover 100, and the second surface of the varistor 400 abuts against the first protrusion 230 in the housing 200. The first protrusion 230 and the second protrusion 110 support the varistor 400, which is convenient for heat dissipation of the varistor 400.

[0037] See also Figure 6-9The thermal release member 500 includes an indicator sheet 510 and a pin sheet 520. The indicator sheet 510 and the pin sheet 520 are pivotally connected to each other. A hanging hole 511 is provided at one end of the indicator sheet 510, and a pivot shaft 512 is provided at the other end. The second end 320 of the elastic recovery member 300 is hung in the hanging hole 511 of the indicator sheet 510. The pin sheet 520 includes a pivot end 521 and a terminal end 522. A pivot hole 5211 is provided on the pivot end 521, and the pivot hole 5211 and the pivot shaft 512 on the indicator sheet 510 are pivotally connected to each other. A degradation indicator mark 513 is provided on the indicator sheet 510. The indicator sheet 510 is made of a flexible material, and specifically can be Teflon or PEEK. After the low-temperature tin melts, the elastic recovery member 300 drives the thermal release member 500 to move, the indicator piece 510 is bent and moved in contact with the bending portion 221 of the partition 220, and the degradation indicator 513 moves to a position corresponding to the indicator window 260. The user can observe the current state of the surge protector module box 997 through the indicator window 260. The pin piece 520 is made of metal, and can be brass, copper, copper-clad steel, etc. The pin piece 520 is sequentially inserted into the first through hole 4111 of the welding folding plate 411 and the second through hole 710 of the first electrical connector 700, and is electrically connected to the welding folding plate 411 and the first electrical connector 700 through low-temperature soldering. The fire extinguishing box 900 is covered on the outside of the connection between the pin piece 520, the welding folding plate 411 and the first electrical connector 700. In this embodiment, the degradation indicator 513 may be provided with a different color from other parts, so that the user can determine the current state of the surge protector module box 997 by observing the color in the indicator window 260. In other embodiments, other methods may be used to implement the indication function.

[0038] See also Figure 7 and Figure 12-16, the remote signaling rod 600 includes a rotating shaft 610, a tail rod 620, an elastic support end 630 and an overlap end 640. The rotating shaft 610 is rotatably arranged in the housing 200. Specifically, the rotating shaft 610 is rotatably arranged in the remote signaling rod mounting hole 270 in the housing 200. The elastic support end 630 and the overlap end 640 are respectively the two ends of the remote signaling rod 600. The rotating shaft 610 is arranged near the elastic support end 630. The elastic support end 630 elastically abuts against the inner side surface 201 of the housing 200, and the overlap end 640 can swing around the rotating shaft 610. The overlap end 640 overlaps the end 522 of the pin piece 520. The tail rod 620 passes through the housing 200 and extends outward, and abuts against the external remote signaling circuit. In this embodiment, the external remote signaling circuit is a circuit composed of the remote signaling circuit board 9981 and the micro switch 9982 in the surge protector base. Specifically, the tail rod 620 abuts against the elastic pressure plate 9983 of the micro switch 9982. When the temperature of the varistor 400 exceeds the low-temperature solder melting temperature threshold, the elastic recovery member 300 resets to drive the indicator sheet 510 and the pin sheet 520 to move, and the lap end 640 of the remote signal rod 600 loses the lap fulcrum and swings, driving the tail rod 620 to deviate, so that the tail rod 620 is disconnected from the micro switch 9982, and a remote signal alarm signal is issued. After receiving the alarm signal, the user can deal with the surge protector 999 in time.

[0039] See also Figure 7 and Fig.10 , the first electrical connector 700 and the second electrical connector 800 are respectively arranged on both sides of the remote signaling rod 600. The first electrical connector 700 is fixedly arranged on the housing 200. The first electrical connector 700 includes a second through hole 710, a first welding end 720 and a first plug-in end 730. The first welding end 720 is fixedly arranged in the housing 200. The second through hole 710 is arranged on the first welding end 720. The pin piece 520 passes through the second through hole 710 and is connected to the first welding end 720 by low-temperature soldering. The first plug-in end 730 vertically passes through the housing 200 and extends outward, and can be plugged into the surge protector module box base 998 to achieve electrical connection with an external power supply.

[0040] See also Figure 7 and Fig.10 The second electrical connector 800 includes a second electrode connection terminal 810 and a second plug terminal 820. The second electrode connection terminal 810 is fixedly disposed in the housing 200. The second electrode connection terminal 810 is connected to the second electrode sheet 420. The second electrode sheet 420, the second electrode connection terminal 810, and the second plug terminal 820 are integrally bent and formed. The second plug terminal 820 vertically passes through the housing 200 and extends outward, and can be plugged into the surge protector module box base 998 to achieve electrical connection with an external power source.

[0041] See also Figure 7-8, a schematic diagram of the internal structure of the surge protector module box under normal working conditions, when the circuit current is stable, the first electrical connector 700 is electrically connected to the first electrode sheet 410, the second electrical connector 800 is electrically connected to the second electrode sheet 420, the pin sheet 520 is connected to the first electrode sheet 410 and the first electrical connector 700 by low-temperature soldering, the overlapping end 640 of the remote signal rod 600 is overlapped with the end 522 of the pin sheet 520, and the tail rod 620 is in contact with the micro switch 9982 on the remote signal circuit board 9981. At this time, the degradation indicator 513 is not displayed at the indicator window 260, and the surge protector module box 997 is in normal condition.

[0042] See also Figure 10-11 , a schematic diagram of the structure of the internal structure of the surge protector module box in a degraded state, when the temperature of the varistor 400 exceeds the low-temperature soldering melting temperature threshold, the pin piece 520 is disconnected from the first electrode piece 410 and the first electrical connector 700, and the cooling material in the fire extinguishing box 900 can cool the melting point in time, and the elastic recovery member 300 resets to drive the indicator piece 510 and the pin piece 520 to move, and the degradation indicator mark 513 moves to a position corresponding to the indicator window 260, indicating that the state is degraded. The user can lock the circuit of the surge protector module box 997 by observing the indicator window 260, and the pin piece 520 moves, and the overlapping end 640 of the remote signal rod 600 loses the overlapping fulcrum and swings, thereby driving the tail rod 620 to deviate and leave the micro switch 9982, sending a remote signal alarm signal, and the user can receive the alarm signal remotely.

[0043] The utility model provides a small surge protector module box, which uses low-temperature soldering to fix the varistor and the first electrical connector. When the varistor heats up, the solder can be quickly melted, and the elastic recovery member drives the thermal release member to move, and the degradation indicator on the thermal release member moves to the indication window for near-end indication. At the same time, the remote signaling rod loses the lap fulcrum and swings, thereby disconnecting the connection with the remote signaling circuit, and realizing the function of remotely alarming the user. The small surge protector module box provided by the utility model has a sophisticated internal structure, which realizes the lightness and thinness of the surge protector module box and reduces the installation space occupied.

[0044] Although the description and illustration of the relevant embodiments of the present invention have been given, those skilled in the art should understand that the description and illustration of these embodiments do not constitute a limitation on the scope of the present invention, and the present invention can be transformed in various forms and details without exceeding the concept and scope of the present invention. Therefore, the scope of the present invention is not limited to the above embodiments, but should be determined by the claims and the equivalents of the claims.

Claims

1. A small surge protector module box, characterized in that: The small surge protector module box includes a shell, a varistor, an elastic recovery member, a thermal release member, a remote signaling rod and a first electrical connector. The first end of the elastic recovery member is fixedly arranged in the shell, and the second end is connected to the first end of the thermal release member. The remote signaling rod is swingably arranged in the shell and overlaps with the second end of the thermal release member. The thermal release member is respectively connected to the varistor and the first electrical connector through low-temperature soldering. When the temperature of the varistor exceeds the low-temperature soldering melting temperature threshold, the thermal release member is disconnected from the varistor and the first electrical connector, the elastic recovery member drives the thermal release member to move, the thermal release member is withdrawn from the first electrical connector, and the remote signaling rod loses the overlap fulcrum and thus swings.

2. A small surge protector module box as claimed in claim 1, characterized in that: The small surge protector module box further comprises a fire extinguishing box, the fire extinguishing box is coated on the second end of the thermal release component, and the interior of the fire extinguishing box is filled with a cooling material.

3. A small surge protector module box as claimed in claim 2, characterized in that: The remote signaling rod includes a rotating shaft, a tail rod, an elastic supporting end and a lap end. The rotating shaft is rotatably arranged in the shell. The elastic supporting end and the lap end are respectively the two ends of the remote signaling rod. The elastic supporting end elastically abuts in the shell. The lap end can swing with the rotating shaft as the axis. The lap end is overlapped with the second end of the thermal release component. The tail rod extends outward through the shell and abuts against the external remote signaling circuit.

4. A small surge protector module box as claimed in claim 3, characterized in that: The thermal release component includes an indicator piece and a pin piece, the pin piece includes a pivot end and a terminal end, the indicator piece and the pivot end of the pin piece are pivotally connected to each other, the pin piece is sequentially inserted into the varistor and the first electrical connector, and is connected to the varistor and the first electrical connector by low-temperature soldering, the overlapping end of the remote signal rod is overlapped at the terminal end of the pin piece, the elastic return member is connected to the indicator piece, a degradation indicator mark is provided on the indicator piece, an indicator window is provided on the shell, and when the elastic return member is reset to drive the thermal release component to move, the degradation indicator mark moves to a position corresponding to the indicator window.

5. A small surge protector module box as claimed in claim 4, characterized in that: The varistor is provided with a first electrode sheet and a second electrode sheet, the first electrode sheet is fixedly attached to the first surface of the varistor, and one end of the first electrode sheet extends out of the varistor and is bent to form a welding folding plate, the welding folding plate is provided with a first through hole, the first electrical connector is provided with a second through hole, the pin sheet passes through the first through hole and the second through hole in sequence, and is connected to the welding folding plate and the first electrical connector by low-temperature soldering, the fire extinguishing box is covered on the outside of the connection between the pin sheet, the welding folding plate and the first electrical connector, and the second electrode sheet is fixedly attached to the second surface of the varistor.

6. A small surge protector module box as claimed in claim 5, characterized in that: The small surge protector module box also includes a second electrical connector, the first electrical connector is an electrical input terminal, the second electrical connector is an electrical output terminal, the first electrical connector and the second electrical connector are respectively fixedly arranged on the shell, and the second electrical connector is integrally bent with the second electrode sheet.

7. A small surge protector module box as claimed in claim 6, characterized in that: The small surge protector module box also includes a cover body, which is buckled with the shell to accommodate the varistor, the elastic recovery member and the thermal release member. The shell is also provided with first protrusions arranged in an array, and the inner side of the cover body is provided with second protrusions arranged in an array. The first surface of the varistor is in contact with the second protrusions, and the second surface of the varistor is in contact with the first protrusions.

8. A small surge protector module box as claimed in claim 7, characterized in that: A partition is also provided in the shell to divide the inner cavity of the shell into a first inner cavity and a second inner cavity. The varistor is arranged in the first inner cavity, and the thermal release component and the elastic return component are arranged in the second inner cavity. The partition is provided with a bending portion. The indicator sheet is made of a flexible material, and the pin sheet is made of a metal material. When the elastic return component drives the thermal release component to move, the indicator sheet is bent and moves in contact with the bending portion.

9. A small surge protector module box as claimed in claim 8, characterized in that: A convex column is also provided in the shell, and a hanging hole is provided at one end of the indicator sheet. The first end of the elastic recovery member is sleeved on the convex column, and the second end of the elastic recovery member is hung in the hanging hole of the indicator sheet. The initial state of the elastic recovery member is a stretched state.

10. A surge protector, characterized in that: The surge protector includes a surge protector base and a small surge protector module box as described in any one of claims 1 to 9, a remote signaling circuit is provided in the surge protector base, a micro switch is provided on the remote signaling circuit, the small surge protector module box is pluggably connected to the surge protector base through a first electrical connector and a second electrical connector, and the remote signaling rod of the small surge protector module box abuts against the micro switch.

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