Miniature low residual voltage on-board surge protector

Abstract

The invention relates to an extremely-small low-residual-voltage plate-mounted surge protector, and belongs to the technical field of surge protectors, the extremely-small low-residual-voltage plate-mounted surge protector comprises a shell, a voltage-sensitive chip assembly, a microswitch and a pin assembly, the shell comprises a bottom plate and a shell, a mounting plate is arranged in the shell, and the pin assembly is arranged in the mounting plate. The pressure-sensitive chip assembly and the microswitch are arranged on the two opposite faces of the mounting plate respectively, a glue pouring area is formed between the inner wall of the shell and the pressure-sensitive chip assembly, glue is poured into the glue pouring area, the pressure-sensitive chip assembly is provided with a first electrode plate and a second electrode plate, and the pin assembly comprises a first pin and a second pin which are arranged on the bottom plate in a penetrating mode. The first pin is connected with the first electrode slice, the second pin is provided with an elastic tripping slice, a connecting pin is arranged on the mounting plate in a penetrating manner, one end of the connecting pin is connected with the second electrode slice, and the other end of the connecting pin is used for being welded with the elastic tripping slice to form a tripping point. The on-board surge protector has the effect of improving the thermal stability and the product safety of the on-board surge protector.

Description

Technical Field

[0001] The present application relates to the technical field of surge protectors, and in particular to an extremely small low residual voltage board-mounted surge protector. Background Art

[0002] A surge protector is a protective device that provides safety protection for various electronic devices, instruments, and communication lines. An onboard surge protector is a surge protector integrated on a PCB circuit board. When the PCB circuit is damaged by lightning or other transient overvoltage, the surge protector can play a protective role.

[0003] At present, small-sized on-board surge protectors mostly use thermal fuses for power-off protection. However, surge protectors using thermal fuses have poor thermal stability and product safety during actual use. Summary of the invention

[0004] In order to help improve the thermal stability performance and product safety of a board-mounted surge protector, the present application provides an extremely small low residual voltage board-mounted surge protector.

[0005] The present application provides an extremely small low residual voltage on-board surge protector that adopts the following technical solution: A very small low residual voltage board-mounted surge protector comprises a shell, a pressure-sensitive chip assembly, a micro switch and a pin assembly, wherein the shell comprises a bottom plate and a shell arranged on the bottom plate, a mounting plate is arranged in the shell, the pressure-sensitive chip assembly and the micro switch are arranged on two opposite sides of the mounting plate respectively, a glue filling area is formed between the inner wall of the shell and the pressure-sensitive chip assembly, glue is filled in the glue filling area, the pressure-sensitive chip assembly is provided with a first electrode sheet and a second electrode sheet, the pin assembly comprises a first pin and a second pin arranged on the bottom plate, the first pin is connected to the first electrode sheet, an elastic release sheet is arranged on the second pin, the elastic release sheet and the micro switch are located on the same side of the mounting plate, a connecting pin is arranged on the mounting plate, one end of the connecting pin is connected to the second electrode sheet, and the other end of the connecting pin is used for welding with the elastic release sheet to form a tripping point, the micro switch is located on the side of the elastic release sheet away from the connecting pin, and when the elastic release sheet is in a natural state, the elastic release sheet presses the micro switch to change the state of the micro switch for remote signaling alarm.

[0006] Preferably, the pressure-sensitive chip assembly includes a plurality of pressure-sensitive chips arranged in sequence along the thickness direction of the outer shell, the first electrode sheet and the second electrode sheet correspond to the pressure-sensitive chips one by one, the first electrode sheet and the second electrode sheet are respectively arranged on opposite sides of the corresponding pressure-sensitive chip, each of the first electrode sheets is connected to the first pin, and each of the second electrode sheets is connected to the connecting pin.

[0007] Preferably, the pressure-sensitive chip assembly is provided with three pressure-sensitive chips, the first electrode sheet of the pressure-sensitive chip located in the middle position abuts against the first electrode sheet of the pressure-sensitive chip on one side, and the second electrode sheet of the pressure-sensitive chip located in the middle position abuts against the second electrode sheet of the pressure-sensitive chip on the other side.

[0008] Preferably, the connecting pins are close to the edge of the mounting plate.

[0009] Preferably, the micro switch is located at an end of the mounting plate away from the second pin.

[0010] Preferably, the elastic release piece includes an elastic connecting section arranged on the second pin and a release section arranged on the elastic connecting section, the angle between a side of the release section close to the micro switch and a side of the elastic connecting section close to the micro switch is less than 180 degrees and greater than 90 degrees, and the release section is used to be welded to the connecting pin to form a release point.

[0011] Preferably, the shell has a length of 28.5 mm, a width of 18.5 mm, and a thickness of 12 mm.

[0012] Preferably, a cutting piece is rotatably provided on one side of the mounting plate close to the elastic release piece, the rotation axis of the cutting piece is parallel to the width direction of the shell, the rotating shaft of the cutting piece is located on the side of the elastic release piece close to the pressure-sensitive chip assembly, an elastic member is provided on the mounting plate for driving the cutting piece to rotate toward the side away from the pressure-sensitive chip assembly, an adjusting bar is slidably provided on one side of the mounting plate close to the elastic release piece, the sliding direction of the adjusting bar is parallel to the length direction of the shell, the adjusting bar is located on the side of the elastic release piece close to the pressure-sensitive chip assembly, the adjusting bar is used to abut against the side of the cutting piece away from the pressure-sensitive chip assembly, a welding block is provided on the adjusting bar, the welding block is welded to the connecting pin, the welding melting point between the welding block and the connecting pin is consistent with the welding melting point between the elastic release piece and the connecting pin, the mounting plate is provided with a spring for pulling the adjusting bar to slide in the direction away from the cutting piece, one end of the spring is provided on the mounting plate, and the other end is provided on the adjusting bar, when the welding block is welded to the connecting pin, the spring is in a stretched state; when the spring is in a natural state, the adjusting bar is separated from the cutting piece.

[0013] Preferably, the elastic member comprises an elastic rope for driving the cutting piece to rotate toward a side away from the pressure-sensitive chip assembly, one end of the elastic rope is arranged on the mounting plate, and the other end is arranged on the cutting piece.

[0014] Preferably, a limiting piece is provided on the adjustment bar, and the limiting piece is used to abut against a side of the elastic release piece away from the connecting pin, and when the spring is in a natural state, the limiting piece is disengaged from the elastic release piece.

[0015] In summary, this application includes the following beneficial technical effects: When the surge protector is working normally, the elastic release piece is welded to the connecting pin, the elastic release piece is in a deformed state, the micro switch is normally closed, and the remote signal is turned on; when the varistor chip component deteriorates or the power frequency fault current continues to occur, the varistor chip component continues to heat up, and the temperature is transmitted to the connecting pin through the second electrode sheet. When the temperature rises to the point where the weld between the connecting pin and the elastic release piece is in a molten state, the elastic release piece resets in the direction close to the micro switch under the action of its own elastic force, and then the elastic release piece is separated from the connecting pin, achieving tripping and power off, and suppressing the micro switch, so that the remote signal is disconnected as an alarm; in this application, by adopting a built-in Thermal tripping, encapsulating heat dissipation colloid in the glue filling area formed between the varistor chip component and the shell, can ensure uniform heat dissipation around the varistor chip component, greatly improve the heat dissipation effect, and effectively extend the thermal breakdown time of the varistor chip component. The heat transfer of the varistor chip component to the tripping point is more effective, avoiding thermal runaway, and ensuring that the tripping point is safely tripped before the varistor chip component thermally breaks down and catches fire. At the same time, it can also ensure that during the normal lightning current release process, the instantaneous heat generated by the varistor chip component is released to the surrounding area in a timely and uniform manner, so that the tripping point will not get out of control due to the instantaneous heat generated by the lightning current on the varistor chip component, effectively improving product safety and thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0017] Figure 2 It is an exploded view of the overall structure of Example 1 of the present application, which is mainly used to show the state of the elastic tripping piece before tripping.

[0018] Figure 3 It is a partial structural explosion diagram of Example 1 of the present application.

[0019] Figure 4 It is a partial structural diagram of Example 1 of the present application, which is mainly used to show the state of the elastic release piece after it is released.

[0020] Figure 5 It is a partial structural diagram of Example 2 of the present application.

[0021] Figure 6 yes Figure 5 Enlarged view of part A.

[0022] Explanation of the reference numerals: 1. Shell; 11. Bottom plate; 12. Shell; 121. Mounting plate; 2. Pressure-sensitive chip assembly; 201. Pressure-sensitive chip; 3. Micro switch; 4. Pin assembly; 41. First pin; 42. Second pin; 6. First electrode sheet; 7. Second electrode sheet; 8. Elastic release sheet; 81. Elastic connecting section; 82. Release section; 9. Connecting pin; 10. Cutting sheet; 13. Adjusting strip; 14. Spring; 15. Elastic rope; 16. Limiting sheet; 17. Pressure-sensitive mounting slot; 18. Remote signal mounting slot; 19. First electrode sheet pin; 20. Second electrode sheet pin; 21. Groove; 22. Connecting sheet; 23. Welding block. DETAILED DESCRIPTION

[0023] The following combination Figure 1-Figure 6 This application is described in further detail.

[0024] Embodiment 1: The present application embodiment discloses an extremely small low residual voltage on-board surge protector. Figure 1 , Figure 2 and Figure 3 The extremely small low residual voltage board-mounted surge protector comprises a housing 1, a pressure-sensitive chip assembly 2, a micro switch 3 and a pin assembly 4, wherein the housing 1 comprises a bottom plate 11 and a shell 12, the shell 12 is assembled on the bottom plate 11 to form a rectangular sealed box body; a mounting plate 121 is fixedly installed in the shell 12, the mounting plate 121 divides the shell 12 into two parts, a pressure-sensitive mounting groove 17 is formed on one side of the mounting plate 121, and a remote signal mounting groove 18 is formed on the other side, the pressure-sensitive chip assembly 2 is installed on the side of the mounting plate 121 close to the pressure-sensitive mounting groove 17, and the micro switch 3 is installed on the side of the mounting plate 121 close to the remote signal mounting groove 18, so that the pressure-sensitive chip assembly 2 and the micro switch 3 are respectively located on the opposite sides of the mounting plate 121, specifically, the bottom plate 11 is located on the side of the mounting plate 121 close to the micro switch 3. A glue filling area is formed between the shell 12 and the pressure-sensitive chip assembly 2, and glue is filled in the glue filling area, specifically, the filling glue in the glue filling area is heat dissipation silica gel.

[0025] Reference Figure 2 and Figure 3The pressure-sensitive chip assembly 2 is provided with a first electrode sheet 6 and a second electrode sheet 7. Specifically, the first electrode sheet 6 is a high-temperature electrode sheet, and the second electrode sheet 7 is a low-temperature electrode sheet; the pin assembly 4 includes a first pin 41 and a second pin 42 that are inserted through the bottom plate 11. The first pin 41 passes through the mounting plate 121 and is connected to the first electrode sheet 6. The second pin 42 only extends into the remote signal mounting groove 18. The second pin 42 is fixedly connected with an elastic release sheet 8. The elastic release sheet 8 is located on the side of the mounting plate 121 away from the pressure-sensitive chip assembly 2. The mounting plate 12 1 is provided with a connecting pin 9, one end of the connecting pin 9 is located in the pressure-sensitive mounting groove 17, and the other end is located in the remote signal mounting groove 18. The end of the connecting pin 9 located in the pressure-sensitive mounting groove 17 is connected to the second electrode sheet 7, and the end of the connecting pin 9 located in the remote signal mounting groove 18 is used for soldering connection with the elastic tripping piece 8 to form a tripping point. The micro switch 3 is located on the side of the elastic tripping piece 8 away from the connecting pin 9. When the elastic tripping piece 8 is in the natural state, the elastic tripping piece 8 presses the micro switch 3 to change the state of the micro switch 3 to perform remote signal alarm.

[0026] When the surge protector is working normally, the elastic release piece 8 is welded to the connecting pin 9, the elastic release piece 8 is in a deformed state, the microswitch 3 is normally closed, and the remote signal is turned on; when the varistor chip component 2 deteriorates or the power frequency fault current continues to occur, the varistor chip component 2 continues to heat up and the temperature is transmitted to the connecting pin 9 through the second electrode sheet 7. When the temperature rises to the point where the solder between the connecting pin 9 and the elastic release piece 8 is in a molten state, the elastic release piece 8 resets in the direction close to the microswitch 3 under the action of its own elastic force, and then the elastic release piece 8 disengages from the connecting pin 9 to achieve tripping and power off, and suppresses the microswitch 3 to disconnect the remote signal as an alarm. In the present application, a built-in thermal release is adopted and heat dissipation silicone is encapsulated in the glue-filling area formed between the varistor chip component 2 and the shell 12, so that the varistor chip component 2 can be evenly dissipated around, the heat dissipation effect can be greatly improved, and the thermal breakdown time of the varistor chip component 2 can be effectively extended. The heat transfer of the varistor chip component 2 to the tripping point is more effective, avoiding thermal runaway, and ensuring that the tripping point is safely tripped before the varistor chip component 2 thermally breaks down and catches fire. At the same time, it can also ensure that during the normal lightning current release process, the instantaneous heat generated by the varistor chip component 2 is released to the surrounding area in a timely and uniform manner, so that the tripping point will not be out of control due to the instantaneous heat generated by the lightning current on the varistor chip component 2, effectively improving the product safety and thermal stability. In addition, the production process is simpler and the cost is lower than that of the thermal insulation type power-off protection.

[0027] Reference Figure 2 and Figure 3The pressure-sensitive chip assembly 2 includes a plurality of pressure-sensitive chips 201, which are all mounted on one side of the mounting plate 121 close to the pressure-sensitive mounting groove 17 and are arranged in sequence along the thickness direction of the housing 12; the first electrode sheet 6 and the second electrode sheet 7 correspond to the pressure-sensitive chips 201 one by one, and the first electrode sheet 6 and the second electrode sheet 7 are respectively attached to the opposite sides of the corresponding pressure-sensitive chip 201. The first electrode sheet 6 is integrally formed with a first electrode sheet pin 19, and the first electrode sheet pin 19 on each first electrode sheet 6 is fixedly connected to one end of the first pin 41 located in the pressure-sensitive mounting groove 17, and the second electrode sheet pin 20 is integrally formed on each second electrode sheet 7, and the plurality of second electrode sheet pins 20 are commonly fixed with a connecting sheet 22, and the connecting sheet 22 is fixedly connected to one side of the connecting pin 9 located in the pressure-sensitive mounting groove 17. In the present application, by using a plurality of pressure-sensitive chips 201 in parallel to share a tripping point, the residual pressure can be reduced while increasing the flow rate.

[0028] Reference Figure 3 Specifically, the pressure-sensitive chip assembly 2 has three pressure-sensitive chips 201, the first electrode sheet 6 of the pressure-sensitive chip 201 in the middle position abuts against the first electrode sheet 6 of the pressure-sensitive chip 201 on one side, and the second electrode sheet 7 of the pressure-sensitive chip 201 in the middle position abuts against the second electrode sheet 7 of the pressure-sensitive chip 201 on the other side. By using three pressure-sensitive chips 201, the nominal flow rate of the present application can reach 20kA, the voltage protection level reaches 360V, and has the advantage of low residual voltage.

[0029] Reference Figure 2 and Figure 4 The connecting pin 9 is close to the edge of the mounting plate 121, so that the elastic tripping piece 8 has enough space to trip, ensuring a sufficient tripping distance. The micro switch 3 is located at the end of the mounting plate 121 away from the second pin 42, which helps to ensure a sufficient tripping distance in a limited space.

[0030] Reference Figure 4 The elastic release piece 8 includes an elastic connection section 81 and a release section 82. The elastic connection section 81 is fixedly connected to the second pin 42. The release section 82 is integrally formed at one end of the elastic connection section 81 away from the second pin 42. The elastic modulus of the release section 82 is higher than the elastic modulus of the elastic connection section 81. The angle between the side of the release section 82 close to the micro switch 3 and the side of the elastic connection section 81 close to the micro switch 3 is less than 180 degrees and greater than 90 degrees. The release section 82 is used to be welded with the connecting pin 9 to form a release point. Designing an angle between the elastic connection section 81 and the release section 82 facilitates welding with the connecting pin 9 on the one hand, and helps to suppress the micro switch 3 to successfully change the state of the micro switch 3 on the other hand.

[0031] Reference Figure 1Specifically, the shell 1 has a length of 28.5 mm, a width of 18.5 mm, and a thickness of 12 mm, and can be adapted to a smaller installation space.

[0032] The implementation principle of Example 1 of the present application is as follows: when the surge protector is working normally, the elastic release piece 8 is welded to the connecting pin 9, the elastic release piece 8 is in a deformed state, the microswitch 3 is normally closed, and the remote signal is turned on; when the varistor chip component 2 deteriorates or the power frequency fault current continues to occur, the varistor chip component 2 continues to heat up and the temperature is transmitted to the connecting pin 9 through the second electrode sheet 7 and the connecting sheet 22. When the temperature rises to the point where the solder between the connecting pin 9 and the elastic release piece 8 is in a molten state, the elastic release piece 8 is reset in a direction close to the microswitch 3 under the action of its own elastic force, and then the elastic release piece 8 is disengaged from the connecting pin 9, thereby achieving tripping and power off, and suppressing the microswitch 3, so that the remote signal is disconnected as an alarm. In the present application, a built-in thermal release is adopted, and heat dissipation silicone is encapsulated in the glue-filling area formed between the varistor chip component 2 and the shell 12, which can not only ensure uniform heat dissipation around the varistor chip component 2, greatly improve the heat dissipation effect, and effectively extend the thermal breakdown time of the varistor chip component 2, but also make the heat transfer of the varistor chip component 2 to the tripping point more effective, avoid thermal runaway, and ensure that the tripping point is safely tripped before the varistor chip component 2 thermally breaks down and catches fire. At the same time, it can also ensure that during the normal lightning current release process, the instantaneous heat generated by the varistor chip component 2 is released to the surrounding area in a timely and uniform manner, so that the tripping point will not be out of control due to the instantaneous heat generated by the lightning current on the varistor chip component 2, effectively improve the product safety and thermal stability, and can ensure the flow rate and low residual pressure of the small-sized board-mounted surge protector.

[0033] Embodiment 2: Reference Figure 5 and Figure 6 , the difference between this embodiment and embodiment 1 is that a groove 21 is provided on one side of the mounting plate 121 close to the micro switch 3, a cutting piece 10 is rotatably provided in the groove 21, the rotation axis of the cutting piece 10 is parallel to the width direction of the mounting plate 121, the rotation axis of the cutting piece 10 is located on the side of the connecting pin 9 close to the second pin 42, when the cutting piece 10 is located in the groove 21, the cutting piece 10 is located on the side of the elastic release piece 8 close to the pressure sensitive chip assembly 2 (refer to Figure 3) side. An elastic member is provided in the groove 21 for driving the cut-off piece 10 to rotate toward the side away from the pressure-sensitive chip assembly 2. In order to facilitate driving the cut-off piece 10 to rotate toward the side away from the pressure-sensitive chip assembly 2, the elastic member includes an elastic rope 15, one end of the elastic rope 15 is fixed to the side of the bottom wall of the groove 21 close to the second pin 42, and the other end is fixed to the cut-off piece 10; when the cut-off piece 10 is located in the groove 21 and extends in the direction away from the second pin 42, the elastic rope 15 is in a stretched state. When the tripping section 82 and the connecting pin 9 are in a welded state, the cut-off piece 10 is aligned with the tripping section 82.

[0034] Reference Figure 5 and Figure 6 In order to limit the cut-off piece 10 in the groove 21, an adjustment bar 13 is slidably arranged in the groove 21. The sliding direction of the adjustment bar 13 is parallel to the length direction of the mounting plate 121. The adjustment bar 13 extends toward the direction close to the first pin 41. The adjustment bar 13 is located between the rotating shaft of the cut-off piece 10 and the tripping section 82. The adjustment bar 13 is used to abut against the side of the cut-off piece 10 close to the tripping section 82. A welding block 23 is arranged on the adjustment bar 13. The welding block 23 is soldered to the connecting pin 9, and the welding block 23 is connected to the connecting pin 9. The melting point of the solder between the legs 9 is consistent with the melting point of the welding between the elastic release piece 8 and the connecting pin 9. A spring 14 is provided in the groove 21 for pulling the adjustment bar 13 to slide in a direction away from the cutting piece 10. One end of the spring 14 is fixed to a side of the groove 21 close to the first pin 41, and the other end is fixed to a side of the adjustment bar 13 close to the first pin 41. When the welding block 23 is welded to the connecting pin 9, the spring 14 is in a stretched state; when the spring 14 is in a natural state, the adjustment bar 13 is separated from the cutting piece 10.

[0035] Reference Figure 5 and Figure 6 A limiting piece 16 is fixed on the adjustment bar 13. The limiting piece 16 is used to abut against the side of the release section 82 away from the connection pin 9. The limiting piece 16 is located in the middle of the adjustment bar 13, so that when the limiting piece 16 is separated from the release section 82 of the elastic release piece 8, the adjustment bar 13 can still continue to abut against the cutting piece 10, which facilitates the release of the elastic release piece 8. When the spring 14 is in a natural state, the distance from the side of the limiting piece 16 close to the connection pin 9 to the connection pin 9 is greater than the distance from the side of the release section 82 away from the second pin 42 to the connection pin 9 when the release section 82 is welded to the connection pin 9, so that the limiting piece 16 is separated from the release section 82.

[0036] The implementation principle of Example 2 of the present application is as follows: when the welding block 23 on the adjustment bar 13 is connected to the connecting pin 9 by soldering, the cut-off piece 10 is located in the groove 21 and extends toward the direction close to the first pin 41, and the adjustment bar 13 presses the cut-off piece 10 in the groove 21, so that the elastic rope 15 is in a stretched state, and at this time, the limiting piece 16 can limit the elastic release piece 8, so that the elastic release piece 8 is not easy to be accidentally released due to vibration or the like; when the temperature of the connecting pin 9 reaches the temperature between the connecting pin 9 and the welding block 23, and between the connecting pin 9 and the When the solder between the elastic release pieces 8 is in a molten state, the adjustment bar 13 slides in a direction away from the cutting piece 10 under the action of the spring 14, and then the limit piece 16 is first separated from the release section 82 of the elastic release piece 8, and then the elastic release piece 8 recovers its deformation in the direction of the micro switch 3 under the action of its own elastic force, and then the adjustment bar 13 is separated from the cutting piece 10, and the cutting piece 10 rotates in a direction away from the groove 21 under the action of the elastic rope 15, which helps to cut off the solder liquid between the connecting pin 9 and the release section 82, thereby ensuring the tripping effect.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An extremely small low residual voltage board-mounted surge protector, characterized in that: The invention comprises a housing (1), a pressure-sensitive chip assembly (2), a micro switch (3) and a pin assembly (4); the housing (1) comprises a bottom plate (11) and a housing (12) arranged on the bottom plate (11); a mounting plate (121) is arranged inside the housing (12); the pressure-sensitive chip assembly (2) and the micro switch (3) are respectively arranged on two opposite sides of the mounting plate (121); a glue filling area is formed between the inner wall of the housing (12) and the pressure-sensitive chip assembly (2); glue is filled in the glue filling area; the pressure-sensitive chip assembly (2) is provided with a first electrode sheet (6) and a second electrode sheet (7); the pin assembly (4) comprises a first pin (41) and a second pin (42) which are inserted through the bottom plate (11); the first The plug pin (41) is connected to the first electrode sheet (6); the second plug pin (42) is provided with an elastic release sheet (8); the elastic release sheet (8) and the micro switch (3) are located on the same surface of the mounting plate (121); a connecting pin (9) is passed through the mounting plate (121); one end of the connecting pin (9) is connected to the second electrode sheet (7); the other end of the connecting pin (9) is used for welding with the elastic release sheet (8) to form a release point; the micro switch (3) is located on a side of the elastic release sheet (8) away from the connecting pin (9); when the elastic release sheet (8) is in a natural state, the elastic release sheet (8) presses the micro switch (3) to change the state of the micro switch (3) to perform a remote signal alarm.

2. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The pressure-sensitive chip assembly (2) comprises a plurality of pressure-sensitive chips (201) arranged in sequence along the thickness direction of the housing (12); the first electrode sheet (6) and the second electrode sheet (7) correspond to the pressure-sensitive chips (201) one by one; the first electrode sheet (6) and the second electrode sheet (7) are respectively arranged on opposite sides of the corresponding pressure-sensitive chip (201); each of the first electrode sheets (6) is connected to a first plug pin (41); and each of the second electrode sheets (7) is connected to a connecting pin (9).

3. The extremely small low residual voltage board-mounted surge protector according to claim 2, characterized in that: The pressure-sensitive chip assembly (2) is provided with three pressure-sensitive chips (201); a first electrode sheet (6) of the pressure-sensitive chip (201) located in the middle position abuts against a first electrode sheet (6) of a pressure-sensitive chip (201) on one side; and a second electrode sheet (7) of the pressure-sensitive chip (201) located in the middle position abuts against a second electrode sheet (7) of a pressure-sensitive chip (201) on the other side.

4. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The connecting pin (9) is close to the edge of the mounting plate (121).

5. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The micro switch (3) is located at an end of the mounting plate (121) away from the second plug pin (42).

6. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The elastic release piece (8) comprises an elastic connection section (81) arranged on the second plug pin (42) and a release section (82) arranged on the elastic connection section (81); the angle between a side of the release section (82) close to the micro switch (3) and a side of the elastic connection section (81) close to the micro switch (3) is less than 180 degrees and greater than 90 degrees; the release section (82) is used to be welded to the connection pin (9) to form a release point.

7. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The shell (1) has a length of 28.5 mm, a width of 18.5 mm and a thickness of 12 mm.

8. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: A cutting piece (10) is rotatably provided on a side of the mounting plate (121) close to the elastic release piece (8); the rotation axis of the cutting piece (10) is parallel to the width direction of the housing (1); the rotation axis of the cutting piece (10) is located on the side of the elastic release piece (8) close to the pressure-sensitive chip assembly (2); an elastic member is provided on the mounting plate (121) for driving the cutting piece (10) to rotate toward a side away from the pressure-sensitive chip assembly (2); an adjusting bar (13) is slidably provided on a side of the mounting plate (121) close to the elastic release piece (8); the sliding direction of the adjusting bar (13) is parallel to the length direction of the housing (1); the adjusting bar (13) is located on the side of the elastic release piece (8) close to the pressure-sensitive chip assembly (2); the adjusting bar (13) is used to move away from the cutting piece (10) The adjusting strip (13) is abutted against one side of the pressure-sensitive chip component (2); a welding block (23) is arranged on the adjusting strip (13); the welding block (23) is welded to the connecting pin (9); the welding melting point between the welding block (23) and the connecting pin (9) is consistent with the welding melting point between the elastic release piece (8) and the connecting pin (9); the mounting plate (121) is provided with a spring (14) for pulling the adjusting strip (13) to slide in a direction away from the cutting piece (10); one end of the spring (14) is arranged on the mounting plate (121), and the other end is arranged on the adjusting strip (13); when the welding block (23) is welded to the connecting pin (9), the spring (14) is in a stretched state; when the spring (14) is in a natural state, the adjusting strip (13) is separated from the cutting piece (10).

9. The extremely small low residual voltage board-mounted surge protector according to claim 8, characterized in that: The elastic member comprises an elastic rope (15) for driving the cut-off piece (10) to rotate toward a side away from the pressure-sensitive chip assembly (2); one end of the elastic rope (15) is arranged on the mounting plate (121), and the other end is arranged on the cut-off piece (10).

10. The extremely small low residual voltage board-mounted surge protector according to claim 8, characterized in that: A limit plate (16) is provided on the adjustment bar (13), and the limit plate (16) is used to abut against a side of the elastic release plate (8) away from the connecting pin (9). When the spring (14) is in a natural state, the limit plate (16) is separated from the elastic release plate (8).

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