An extremely small low residual voltage board-mounted surge protector

Abstract

The present application relates to an extremely small low residual voltage board-mounted surge protector, which belongs to the technical field of surge protectors. The extremely small low residual voltage board-mounted surge protector includes a shell, a pressure-sensitive chip assembly, a micro switch and a pin assembly. The shell includes a bottom plate and an outer shell. A mounting plate is provided in the outer shell. The pressure-sensitive chip assembly and the micro switch are respectively provided on two opposite sides of the mounting plate. A glue filling area is formed between the inner wall of the outer 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 includes a first pin and a second pin provided on the bottom plate. The first pin is connected to the first electrode sheet. The second pin is provided with an elastic trip sheet. A connecting pin is provided on the mounting plate. One end of the connecting pin is connected to the second electrode sheet. The other end of the connecting pin is used to be welded to the elastic trip sheet to form a trip point. The present application has the effect of improving the thermal stability performance and product safety of the board-mounted 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 (SPD) is a device that provides safety protection for various electronic devices, instruments, and communication lines. An onboard SPD is one integrated into a printed circuit board (PCB). It protects the PCB circuits from lightning strikes or other transient overvoltage events.

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

[0005] This application provides an extremely small low residual voltage onboard surge protector that adopts the following technical solutions:

[0006] A very small low residual voltage board-mounted surge protector comprises a housing, a pressure-sensitive chip assembly, a microswitch, and a pin assembly. The housing comprises a base plate and a housing disposed on the base plate. A mounting plate is disposed within the housing. The pressure-sensitive chip assembly and the microswitch are respectively disposed on opposite sides of the mounting plate. A glue potting area is formed between the inner wall of the housing and the pressure-sensitive chip assembly. Glue is poured into the glue potting 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 disposed through the base plate. The first pin is connected to the first electrode sheet. The second pin is provided with an elastic trip sheet. The elastic trip sheet and the microswitch are located on the same side of the mounting plate. A connecting pin is disposed through the mounting plate. One end of the connecting pin is connected to the second electrode sheet. The other end of the connecting pin is used to be welded to the elastic trip sheet to form a trip point. The microswitch is located on a side of the elastic trip sheet away from the connecting pin. When the elastic trip sheet is in a natural state, the elastic trip sheet presses the microswitch to change the state of the microswitch and to generate a remote alarm.

[0007] Preferably, the pressure-sensitive chip assembly includes a plurality of pressure-sensitive chips arranged in sequence along the thickness direction of the shell, the first electrode sheet and the second electrode sheet correspond one-to-one to the pressure-sensitive chips, 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.

[0008] 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.

[0009] Preferably, the connecting pins are close to the edge of the mounting plate.

[0010] Preferably, the micro switch is located at an end of the mounting plate away from the second pin.

[0011] Preferably, the elastic tripping piece includes an elastic connecting section arranged on the second pin and a tripping section arranged on the elastic connecting section, the angle between the side of the tripping section close to the micro switch and the side of the elastic connecting section close to the micro switch is less than 180 degrees and greater than 90 degrees, and the tripping section is used to be welded to the connecting pin to form a tripping point.

[0012] Preferably, the shell has a length of 28.5 mm, a width of 18.5 mm, and a thickness of 12 mm.

[0013] Preferably, a cutting piece is rotatably provided on a side of the mounting plate close to the elastic tripping piece, the rotation axis of the cutting piece is parallel to the width direction of the shell, the rotation axis of the cutting piece is located on the side of the elastic tripping 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 adjustment bar is slidably provided on the side of the mounting plate close to the elastic tripping piece, the sliding direction of the adjustment bar is parallel to the length direction of the shell, the adjustment bar is located on the side of the elastic tripping piece close to the pressure-sensitive chip assembly, the adjustment 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 adjustment 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 tripping piece and the connecting pin, the mounting plate is provided with a spring for pulling the adjustment 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 adjustment 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 adjustment bar is separated from the cutting piece.

[0014] Preferably, the elastic member includes an elastic rope for driving the cut-off 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 cut-off piece.

[0015] 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. When the spring is in a natural state, the limiting piece is disengaged from the elastic release piece.

[0016] In summary, this application has the following beneficial technical effects:

[0017] When the surge protector is working normally, the elastic tripping piece is welded to the connecting pin, the elastic tripping piece is in a deformed state, the micro switch is normally closed, and the remote signal is turned on; when the pressure sensitive chip component deteriorates or the power frequency fault current continues to occur, the pressure sensitive 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 tripping piece is in a molten state, the elastic tripping piece resets in the direction close to the micro switch under the action of its own elastic force, and then the elastic tripping 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 potting area formed between the pressure-sensitive chip component and the shell, can ensure uniform heat dissipation around the pressure-sensitive chip component, greatly improve the heat dissipation effect, and effectively extend the thermal breakdown time of the pressure-sensitive chip component. The pressure-sensitive chip component is more effective in transferring heat to the tripping point, avoiding thermal runaway, and ensuring that the tripping point is safely tripped before the pressure-sensitive chip component thermal breakdown and fire. At the same time, it can also ensure that during the normal lightning current release process, the instantaneous heat generated by the pressure-sensitive chip component 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 pressure-sensitive chip component, effectively improving product safety and thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0019] Figure 2 This is an exploded view of the overall structure of Example 1 of the present application, mainly used to show the state of the elastic tripping piece before tripping.

[0020] Figure 3 This is a partial structural exploded diagram of Example 1 of the present application.

[0021] Figure 4 This is a partial structural diagram of Example 1 of the present application, mainly used to show the state of the elastic tripping piece after it is tripped.

[0022] Figure 5 This is a partial structural diagram of Example 2 of the present application.

[0023] Figure 6 yes Figure 5 Enlarged view of part A.

[0024] Explanation of the accompanying drawings: 1. Shell; 11. Base plate; 12. Outer 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 tripping piece; 81. Elastic connecting section; 82. Tripping section; 9. Connecting pin; 10. Cutting piece; 13. Adjusting bar; 14. Spring; 15. Elastic rope; 16. Limiting piece; 17. Pressure-sensitive mounting slot; 18. Remote signal mounting slot; 19. First electrode sheet pin; 20. Second electrode sheet pin; 21. Groove; 22. Connecting piece; 23. Welding block. DETAILED DESCRIPTION

[0025] The following combination Figures 1-6 This application is described in further detail.

[0026] Example 1:

[0027] The embodiment of the present application discloses an extremely small low residual voltage board-mounted surge protector. Figure 1 、 Figure 2 and Figure 3 The ultra-small, low-residual-voltage board-mounted surge protector includes a housing 1, a pressure-sensitive chip assembly 2, a microswitch 3, and a pin assembly 4. The housing 1 includes a base plate 11 and an outer shell 12. The outer shell 12 is assembled on the base plate 11 to form a rectangular sealed box. A mounting plate 121 is fixedly mounted within the outer shell 12, dividing the outer 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 mounted on the side of the mounting plate 121 near the pressure-sensitive mounting groove 17, and the microswitch 3 is mounted on the side of the mounting plate 121 near the remote signal mounting groove 18, so that the pressure-sensitive chip assembly 2 and the microswitch 3 are located on opposite sides of the mounting plate 121. Specifically, the base plate 11 is located on the side of the mounting plate 121 near the microswitch 3. A glue potting area is formed between the outer shell 12 and the pressure-sensitive chip assembly 2. The glue potting area is filled with glue. Specifically, the potting glue in the glue potting area is heat-dissipating silicone.

[0028] 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 arranged on 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 to an elastic tripping piece 8. The elastic tripping piece 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 signaling alarm.

[0029] When the surge protector is working normally, the elastic tripping piece 8 is welded to the connecting pin 9, the elastic tripping piece 8 is in a deformed state, the micro switch 3 is normally closed, and the remote signal is turned on; when the pressure sensitive chip component 2 deteriorates or the power frequency fault current continues to occur, the pressure sensitive chip component 2 continues to heat up and the temperature is transmitted to the connecting pin 9 through the second electrode piece 7. When the temperature rises to the point where the solder between the connecting pin 9 and the elastic tripping piece 8 is in a molten state, the elastic tripping piece 8 is reset in the direction close to the micro switch 3 under the action of its own elastic force, and then the elastic tripping piece 8 is disengaged from the connecting pin 9, achieving tripping and power off, and suppressing the micro switch 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-filled area formed between the pressure-sensitive chip component 2 and the shell 12, which can ensure uniform heat dissipation around the pressure-sensitive chip component 2, greatly improve the heat dissipation effect, and effectively extend the thermal breakdown time of the pressure-sensitive chip component 2. The pressure-sensitive chip component 2 is more effective in transferring heat to the tripping point, avoiding thermal runaway, and ensuring that the tripping point is safely tripped before the pressure-sensitive 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 pressure-sensitive 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 pressure-sensitive chip component 2, effectively improving the product safety and thermal stability. In addition, the production process is simpler and less expensive than the thermal insulation type power-off protection.

[0030] Reference Figure 2 and Figure 3The pressure-sensitive chip assembly 2 includes a plurality of pressure-sensitive chips 201. The plurality of pressure-sensitive chips 201 are mounted on the 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. A first electrode sheet pin 19 is integrally formed on each of the first electrode sheets 6. 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. A second electrode sheet pin 20 is integrally formed on each of the second electrode sheets 7. The plurality of second electrode sheet pins 20 are commonly fixed with a connecting piece 22. The connecting piece 22 is fixedly connected to one side of the connecting pin 9 located in the pressure-sensitive mounting groove 17. In this application, by using multiple pressure-sensitive chips 201 in parallel to share a tripping point, the residual pressure can be reduced while increasing the flow rate.

[0031] Reference Figure 3 Specifically, the pressure-sensitive chip assembly 2 includes three pressure-sensitive chips 201. The first electrode 6 of the central pressure-sensitive chip 201 abuts against the first electrode 6 of the pressure-sensitive chip 201 on one side, and the second electrode 7 of the central pressure-sensitive chip 201 abuts against the second electrode 7 of the pressure-sensitive chip 201 on the other side. By using three pressure-sensitive chips 201, the nominal flow rate of this application can reach 20kA, the voltage protection level reaches 360V, and has the advantage of low residual voltage.

[0032] Reference Figure 2 and Figure 4 The connection pin 9 is close to the edge of the mounting plate 121, allowing the elastic trip plate 8 enough space to trip and ensure 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 within the limited space.

[0033] Reference Figure 4 The elastic tripping piece 8 includes an elastic connecting section 81 and a tripping section 82. The elastic connecting section 81 is fixedly connected to the second pin 42. The tripping section 82 is integrally formed at the end of the elastic connecting section 81 away from the second pin 42. The elastic modulus of the tripping section 82 is higher than the elastic modulus of the elastic connecting section 81. The angle between the side of the tripping section 82 near the microswitch 3 and the side of the elastic connecting section 81 near the microswitch 3 is less than 180 degrees and greater than 90 degrees. The tripping section 82 is used to be welded to the connecting pin 9 to form a tripping point. The angle between the elastic connecting section 81 and the tripping section 82 not only facilitates welding to the connecting pin 9, but also helps to press the microswitch 3 to successfully change the state of the microswitch 3.

[0034] 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.

[0035] The implementation principle of Example 1 of the present application is: when the surge protector is working normally, the elastic trip piece 8 is welded to the connecting pin 9, the elastic trip piece 8 is in a deformed state, the microswitch 3 is normally closed, and the remote signal is turned on; when the pressure-sensitive chip component 2 deteriorates or the power frequency fault current continues to occur, the pressure-sensitive chip component 2 continues to heat up and the temperature is transmitted to the connecting pin 9 through the second electrode piece 7 and the connecting piece 22. When the temperature rises to the point where the soldering between the connecting pin 9 and the elastic trip piece 8 is in a molten state, the elastic trip piece 8 is reset in the direction close to the microswitch 3 under the action of its own elastic force, and then the elastic trip piece 8 is disengaged from the connecting pin 9, 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-filled area formed between the pressure-sensitive chip component 2 and the shell 12. This not only ensures uniform heat dissipation around the pressure-sensitive chip component 2, greatly improves the heat dissipation effect, and effectively prolongs the thermal breakdown time of the pressure-sensitive chip component 2, but also makes the heat transfer of the pressure-sensitive chip component 2 to the tripping point more effective, avoids thermal runaway, and ensures that the tripping point is safely tripped before the pressure-sensitive 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 pressure-sensitive 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 pressure-sensitive chip component 2, effectively improving the product safety and thermal stability, and can ensure the flow rate and low residual pressure of the small-sized board-mounted surge protector.

[0036] Example 2:

[0037] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that a groove 21 is provided on the side of the mounting plate 121 close to the micro switch 3, and a cut-off piece 10 is rotatably provided in the groove 21. The rotation axis of the cut-off piece 10 is parallel to the width direction of the mounting plate 121, and the rotation axis of the cut-off piece 10 is located on the side of the connecting pin 9 close to the second pin 42. When the cut-off piece 10 is located in the groove 21, the cut-off piece 10 is located on the side of the elastic tripping piece 8 close to the pressure-sensitive chip assembly 2 (refer to Figure 3) side. An elastic member is disposed within the recess 21 for rotating the cutoff piece 10 away from the pressure-sensitive chip assembly 2. To facilitate rotation of the cutoff piece 10 away from the pressure-sensitive chip assembly 2, the elastic member includes an elastic cord 15. One end of the elastic cord 15 is secured to the bottom wall of the recess 21 near the second pin 42, and the other end is secured to the cutoff piece 10. When the cutoff piece 10 is within the recess 21 and extending away from the second pin 42, the elastic cord 15 is in a stretched state. When the tripping section 82 and the connecting pin 9 are welded, the cutoff piece 10 is aligned with the tripping section 82.

[0038] Reference Figure 5 and Figure 6 In order to facilitate the restriction of the cut-off piece 10 in the groove 21, an adjustment bar 13 is slidably provided 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 provided 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 weld 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 the direction away from the cutting piece 10. One end of the spring 14 is fixed to the side of the groove 21 close to the first pin 41, and the other end is fixed to the 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.

[0039] Reference Figure 5 and Figure 6 A limiting piece 16 is fixed to the adjustment bar 13. The limiting piece 16 is used to abut the side of the tripping section 82 away from the connecting pin 9. The limiting piece 16 is located in the middle of the adjustment bar 13. When the limiting piece 16 disengages from the tripping section 82 of the elastic tripping piece 8, the adjustment bar 13 can still abut against the cutting piece 10, facilitating the release of the elastic tripping piece 8. When the spring 14 is in the natural state, the distance between the side of the limiting piece 16 closest to the connecting pin 9 and the connecting pin 9 is greater than the distance between the side of the tripping section 82 away from the second pin 42 and the connecting pin 9 when the tripping section 82 is welded to the connecting pin 9, allowing the limiting piece 16 to disengage from the tripping section 82.

[0040] 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 tripping piece 8, so that the elastic tripping piece 8 is not easily accidentally tripped due to vibration or the like; when the temperature of the connecting pin 9 reaches a temperature that causes the connection between the connecting pin 9 and the welding block 23, and the connection between the connecting pin 9 and the first pin 41 to be locked, the elastic rope 15 is in a stretched state, and ... When the solder between the elastic trip pieces 8 is in a molten state, the adjustment bar 13 slides in the direction away from the cutting piece 10 under the action of the spring 14, and then the limit piece 16 first disengages from the tripping section 82 of the elastic trip piece 8, and then the elastic trip 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 disengages from the cutting piece 10, and the cutting piece 10 rotates in the 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 tripping section 82, thereby ensuring the tripping effect.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An extremely small low residual voltage board-mounted surge protector, characterized by: 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 in 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 plug sheet (6) and a second electrode sheet (7) which are inserted through the bottom plate (11); A pin (41) and a second pin (42), wherein the first pin (41) is connected to the first electrode sheet (6), and the second pin (42) is provided with an elastic tripping piece (8), and the elastic tripping piece (8) and the micro switch (3) are located on the same surface of the mounting plate (121), and the mounting plate (121) is provided with a connecting pin (9), one end of the connecting pin (9) is connected to the second electrode sheet (7), and the other end of the connecting pin (9) is used for welding with the elastic tripping piece (8) to form a tripping point, and the micro switch (3) is located on the side of the elastic tripping piece (8) away from the connecting pin (9), and when the elastic tripping piece (8) is in a natural state, The elastic tripping piece (8) presses the micro switch (3) to change the state of the micro switch (3) to perform remote signaling alarm; a cutting piece (10) is rotatably provided on a side of the mounting plate (121) close to the elastic tripping piece (8); a rotating shaft of the cutting piece (10) is located on a side of the elastic tripping 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 tripping piece (8); the adjusting bar (13) is used to rotate with the cutting piece (10) away from the pressure-sensitive chip assembly The adjusting bar (13) is abutted against one side of the component (2); a welding block (23) is provided on the adjusting bar (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 bar (13) to slide in a direction away from the cutting piece (10); 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 bar (13) is separated from the cutting piece (10).

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 the first pin (41); and each of the second electrode sheets (7) is connected to the 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), the first electrode sheet (6) of the pressure-sensitive chip (201) located 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) located in the middle position abuts against the second electrode sheet (7) of the 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 pins (9) are 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 pin (42).

6. The extremely small low residual voltage board-mounted surge protector according to claim 1, characterized in that: The elastic tripping piece (8) comprises an elastic connecting section (81) arranged on the second plug pin (42) and a tripping section (82) arranged on the elastic connecting section (81); the angle between the side of the tripping section (82) close to the micro switch (3) and the side of the elastic connecting section (81) close to the micro switch (3) is less than 180 degrees and greater than 90 degrees; the tripping section (82) is used to be welded to the connecting pin (9) to form a tripping 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: The rotation axis of the cutting piece (10) is parallel to the width direction of the housing (1), the sliding direction of the adjustment bar (13) is parallel to the length direction of the housing (1), the adjustment bar (13) is located on a side of the elastic release piece (8) close to the pressure-sensitive chip assembly (2), and one end of the spring (14) is arranged on the mounting plate (121), and the other end is arranged on the adjustment bar (13).

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 limiting piece (16) is provided on the adjustment bar (13), and the limiting piece (16) is used to abut against a side of the elastic release piece (8) away from the connecting pin (9). When the spring (14) is in a natural state, the limiting piece (16) is separated from the elastic release piece (8).

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