Alarm system and surge protector

Abstract

An alarm system for a surge protector, comprising: a plurality of varistors; a plurality of fuse links, each piezoresistor configured to be connected to a respective fuse link via a solder joint; when the corresponding welding spots are effective, the fusing rods abut against the pressing rod assemblies; the pressing plate piece comprises a pressing plate main body and a pressing arm, the pressing plate main body is provided with a plurality of through holes, and each through hole corresponds to the corresponding pressing rod assembly; each supporting piece penetrates through the corresponding through hole; when a welding spot of one of the varistors fails, the corresponding fusing rod is separated from the pressing rod assembly, so that the pressing rod assembly moves in the first direction, the pressing rod assembly is separated from the corresponding supporting piece, and the supporting piece drives the pressing plate to move towards the pressing rod assembly so as to release or press a button of the microswitch.

Description

Technical Field

[0001] The present invention relates to an alarm system for a surge protector, and more particularly, to an alarm system capable of warning of solder joint failure in a surge protector. Background Art

[0002] In a surge protector, a varistor is electrically connected to an external circuit via a solder joint. When the solder joint fails due to high temperature (e.g., melting), the surge protector cannot operate normally, and an alarm needs to be issued to notify the staff to repair or replace the varistor.

[0003] In the prior art, each varistor is provided with a corresponding microswitch, and there is a corresponding relationship between the solder joint state (normal or failed) of each varistor and the state of the microswitch. When the solder joint of a varistor fails, the corresponding microswitch can change its state, thereby transmitting the information of the solder joint failure to the corresponding staff. However, the above alarm system requires a microswitch to be set for each varistor, and the cost of the microswitch is relatively high. Therefore, for a surge protector including a plurality of varistors, this greatly increases the cost of the alarm system.

[0004] Therefore, it is desirable to propose an alarm system for a surge protector that can improve the defects in the above prior art. Summary of the Invention

[0005] According to a first aspect of the present invention, there is provided an alarm system for a surge protector, the alarm system comprising: a varistor module including a plurality of varistors, each varistor having a body and a solder joint protruding from the body; a plurality of fusing rods electrically connected to an external circuit, each varistor being configured to be connected to a corresponding fusing rod via a solder joint; a plurality of pressing rod assemblies respectively arranged around the corresponding varistors, when the corresponding solder joint is effective, the fusing rod abuts against the pressing rod assembly to block the movement of the pressing rod assembly; a pressing plate member including a pressing plate body and a pressing arm, the pressing plate body having a plurality of through holes, each through hole corresponding to a corresponding pressing rod assembly, the pressing plate body being biased to an initial position under the action of a biasing member; a plurality of support members, each support member passing through the corresponding through hole and abutting against the corresponding pressing rod assembly when the corresponding solder joint is effective; a microswitch including a button and disposed on a side of the pressing plate away from the pressing rod assembly, the pressing arm pressing or releasing the button to cause the microswitch to switch between a first state and a second state, when the button is in a pressed state, the microswitch is in the first state, and when the button is in a released state, the microswitch is in the second state; wherein, when the solder joint of one of the plurality of varistors fails, the corresponding fusing rod disengages from the pressing rod assembly, so that the support member causes the pressing plate body to move towards the pressing rod assembly under the action of the corresponding second driving member, and the pressing arm presses or releases the button.

[0006] According to this solution, for a surge protector including multiple varistors, only one microswitch needs to be set to achieve the alarm function for the failure of the solder joints of the varistors, thus greatly reducing the cost of the alarm system.

[0007] In some solutions, the pressing plate member may further include a rotating shaft, and the pressing plate member can rotate around the rotating shaft to cause the pressing arm to rotate around the rotating shaft.

[0008] According to this solution, driving the button of the microswitch by rotation is more suitable for use when the width of the surge protector is relatively large.

[0009] In some solutions, the pressing plate main body can move towards the pressing rod assembly to cause the pressing arm to press the button.

[0010] In some solutions, the pressing plate main body and the pressing arm can form a flat plate extending along the same plane.

[0011] In some solutions, the pressing plate main body can move towards the pressing rod assembly to cause the pressing arm to release the button.

[0012] In some solutions, the alarm system may further include a limiting member, which is arranged on the side of the pressing plate main body away from the pressing rod assembly to limit the excessive movement of the pressing arm towards the button.

[0013] According to this solution, the limiting member can prevent the pressing arm from excessively pressing the button of the microswitch and damaging the microswitch.

[0014] In some solutions, the first driving member can be a first spring, the first spring extends along a first direction, and the first spring abuts against the corresponding pressing rod assembly and is configured to bias the corresponding pressing rod assembly along the first direction.

[0015] In some solutions, the second driving member can be a second spring, the second spring extends along a second direction perpendicular to the first direction, and the second spring is configured to bias the corresponding support member towards the corresponding varistor.

[0016] In some solutions, the biasing member can be a third spring.

[0017] In some solutions, each support member can have a boss protruding perpendicular to the second direction, the boss is arranged on the side of the pressing plate main body away from the pressing rod assembly, and when the solder joint fails, the boss abuts against the pressing plate main body under the action of the second spring.

[0018] In some embodiments, the pressure bar assembly may include a first part and a second part. When the corresponding solder joint is effective, the fusing rod abuts against the first part of the corresponding pressure bar assembly, each first spring abuts against the first part of the corresponding pressure bar assembly, each support member abuts against the second part of the corresponding pressure bar assembly, and the first part and the second part form a T-shaped structure.

[0019] In some embodiments, the solder joint may be disposed on a side of the varistor away from the support member.

[0020] In some embodiments, the alarm system may further include a torsion spring. When the solder joint fails, the fusing rod disengages from the first part of the pressure bar assembly under the action of the torsion spring, thereby allowing the pressure bar assembly to move under the action of the first spring.

[0021] In some embodiments, the alarm system may further include a PCBA board, and the PCBA board is electrically connected to the microswitch.

[0022] In some embodiments, the alarm system may further include an indicator, and the indicator is communicatively coupled to the PCBA board for indicating the state of the microswitch.

[0023] In some embodiments, the indicator may be a lamp. When the solder joint fails, the lamp emits light, and when the solder joint is effective, the lamp does not emit light.

[0024] According to a second aspect of the present invention, a surge protector is provided, which includes the alarm system according to the first aspect of the present invention.

[0025] According to this solution, even if the surge protector includes a plurality of varistors, only one microswitch is required to achieve the alarm function for the failure of the solder joint, thereby greatly reducing the manufacturing cost of the surge protector.

[0026] In some embodiments, the surge protector may include four varistors, where three varistors are connected to the live wire and the other varistor is connected to the neutral wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Fig. shows a schematic front view of the alarm system according to the first embodiment of the present invention;

[0028] Figure 2 Fig. shows a schematic rear view of the alarm system according to the first embodiment of the present invention;

[0029] Figure 3 Fig. shows a schematic rear view of the alarm system according to the first embodiment of the present invention, where the solder joint is in a failed state;

[0030] Figure 4 Fig. shows a schematic top view of the alarm system according to the embodiment of the present invention;

[0031] Figure 5 Shows a schematic front view of an alarm system according to a second embodiment of the present invention;

[0032] Figure 6 Shows a schematic rear view of an alarm system according to a second embodiment of the present invention;

[0033] Figure 7 Shows a schematic rear view of an alarm system according to a second embodiment of the present invention, where the solder joint is in a failed state;

[0034] Figure 8 Shows a schematic diagram of a pressure plate member of an alarm system according to a second embodiment of the present invention.

[0035] Reference numerals:

[0036] 100 Warning system

[0037] 110 Varistor

[0038] 112 Body

[0039] 114 Solder joint

[0040] 120 Fuse rod

[0041] 130 Pressure rod assembly

[0042] 132 First part

[0043] 134 Second part

[0044] 140 First spring

[0045] 150 Pressure plate member

[0046] 152 Through hole

[0047] 160 Support member

[0048] 162 Boss

[0049] 170 Second spring

[0050] 174 Third spring

[0051] 180 Micro switch

[0052] 182 Button

[0053] 190 PCBA board.

[0054] 200 Warning system 210 Varistor 212 Body

[0055] 214 Solder joint

[0056] 220 Fuse rod

[0057] The 230 strut assembly, the 232 first part, the 234 second part, the 240 first spring, the 250 pressing plate member

[0058] The 252 through hole

[0059] The 254 pressing plate main body

[0060] The 256 pressing arm

[0061] The 258 rotating shaft

[0062] The 260 support member

[0063] The 270 second spring

[0064] The 280 microswitch

[0065] The 282 button Detailed implementation manners

[0066] In order to make the objectives, solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components. The up, down, left and right directions in the drawings and the following description are only exemplary and are not intended to limit the orientation of any component in the system.

[0067] Figure 1 Fig. shows a schematic front view of an alarm system 100 for a surge protector according to a first embodiment of the present invention. The alarm system 100 mainly includes a plurality of varistors 110, a plurality of fuse rods 120 electrically connected to an external circuit corresponding to the plurality of varistors 110, a strut assembly 130 arranged around the varistors 110, a first spring 140, a support member 160, a second spring 170, a pressing plate member 150 and a third spring 174. The surge protector may include four varistors 110, where three varistors are connected to the live wire and the other varistor is connected to the neutral wire. It should be understood that the number of varistors 110 in the above surge protector is only exemplary, and the present invention is not intended to limit the number of varistors 110 included in the surge protector. For example, the surge protector may include two varistors to form a 2P structure. Alternatively, the surge protector may include three varistors to form a 3P or 3PN structure.

[0068] Each varistor 110 has a body 112 and a solder joint 114 protruding from the body 112, and is configured to be connected to a corresponding fuse rod 120 via the solder joint 114. When the corresponding solder joint 114 is not failed, the fuse rod 120 abuts against the pressure rod assembly 130 to block the movement of the pressure rod assembly 130. The first spring 140 extends in a first direction (e.g., the left - right direction as shown in Figure 1 ) and abuts against the corresponding pressure rod assembly 130 to bias the corresponding pressure rod assembly 130 in the first direction. The pressing plate member 150 has a plurality of through - holes 152 corresponding to the corresponding pressure rod assemblies 130. The support member 160 passes through the corresponding through - holes 152 and abuts against the corresponding pressure rod assembly 130 when the corresponding solder joint 114 is not failed. The second spring 170 extends in a second direction perpendicular to the first direction (e.g., the left - right direction as shown in Figure 1 , e.g., the up - down direction as shown in Figure 1 ) and is configured to bias the corresponding support member 160 toward the corresponding varistor 110. The micro - switch 180 includes a button 182 and is disposed on a side of the pressing plate member 150 away from the pressure rod assembly 130. The pressing plate member 150 presses or releases the button 182 to cause the micro - switch 180 to switch between a first state and a second state. When the button 182 is in a pressed state, the micro - switch 180 is in the first state, and when the button 182 is in a released state, the micro - switch 180 is in the second state. The third spring 174 is configured to bias the pressing plate 150 toward the micro - switch 180.

[0069] According to the above arrangement, when the solder joints 114 of all the varistors 110 among the plurality of varistors are in a normal state, the fuse rod 120 is fixed to the solder joint 114 to block the left - right movement of the pressure rod assembly 130. The other end of the pressure rod assembly 130 further blocks the upward movement of the support member 160, so that the support member 160 does not contact the pressing plate member 150 (preferably, there is a gap between the boss 162 of the support member 160 and the pressing plate member 150) and cannot push the pressing plate member 150 upward, so that the pressing plate member 150 remains in the position of pressing the button 182 of the micro - switch 180, and the micro - switch 180 remains in the first state. When the solder joint 114 of any one of the plurality of varistors 110 fails, the corresponding fuse rod 120 disengages from the pressure rod assembly 130 and no longer blocks the movement of the pressure rod assembly 130, causing the pressure rod assembly 130 to move in the first direction (e.g., the left - right direction as shown in Figure 1 ) under the action of the corresponding first spring 140. Thus, the pressure rod assembly 130 disengages from abutting against the corresponding support member 160, so that the corresponding second spring 170 is released from the compressed state. Since the acting force of the second spring 170 on the pressing plate member 150 is greater than the acting force of the third spring 174 on the pressing plate 150, the support member 160 drives the pressing plate member 150 to move toward the pressure rod assembly 130 (i.e.,Figure 1 The button 182 of the microswitch 180 is released by moving upward in Figure 1 , causing the microswitch 180 to switch from the first state to the second state.

[0070] In other words, as Figure 1 shown, when the solder joint 114 of the varistor 110 is not failed, the fusing rod 120 restricts the left - right movement freedom of the pressing rod assembly 130, and further causes the pressing rod assembly 130 to restrict the upward movement freedom of the support member 160. And as Figure 3 shown, when the solder joint 114 of the varistor 110 fails, the restricted degrees of freedom are released, causing the support member 160 to drive the pressing plate member 150 to move upward, thereby releasing the button 182 pressed by the pressing plate member 150, and further causing the microswitch 180 to switch states. It should be noted that as long as the solder joint 114 of any one of the multiple varistors fails (without the solder joints 114 of multiple varistors 110 failing), the pressing plate 150 can move upward under the drive of the corresponding released support member 160 to switch the state of the microswitch 180. In this way, the monitoring of the solder joint states of multiple varistors 110 is realized only through one microswitch 180, thereby greatly reducing the manufacturing cost of the alarm system 100.

[0071] It should be understood that after the solder joint 114 of the varistor 110 fails, the first spring 140 that drives the pressing rod assembly 130 to move in the first direction is only exemplary, and any other suitable driving component can also be used to drive the pressing rod assembly 130 to move in the first direction. Similarly, after the solder joint 114 of the varistor 110 fails, the second spring 170 that drives the support member 160 to move in the second direction is only exemplary, and any other suitable driving component can also be used to drive the support member 160 to move in the second direction. In addition, the third spring 174 configured to bias the support member 160 towards the microswitch 180 is also only exemplary, and any other suitable biasing component can be used to bias the support member 160 towards the microswitch 180.

[0072] Optionally, each support member 160 may have a boss 162 protruding perpendicular to the up - down direction, and the boss 162 is disposed on the side of the pressing plate 150 away from the pressing rod assembly 130 (i.e., Figure 1 the lower side of the pressing plate 150 shown in Figure 1 ) and can abut against the pressing plate 150 under the action of the second spring 170 to drive the pressing plate 150 to move upward.

[0073] Optionally, as Figure 2As shown, the compression rod assembly 130 may include a first part 132 and a second part 134. When the corresponding solder joints 114 are effective, the fusing rod 120 abuts against the first part 132 of the corresponding compression rod assembly 130, each first spring 140 abuts against the first part 132 of the corresponding compression rod assembly 130, each support member 160 abuts against the second part 134 of the corresponding compression rod assembly 130, and the first part 132 and the second part 134 form a T-shaped structure. The first part 132 and the second part 134 may be connected together by any suitable means such as riveting. Optionally, the solder joints 114 of the varistor 110 may be arranged on a side of the varistor 110 away from the support member 160 (e.g., Figure 1 the upper side shown).

[0074] Optionally, the alarm system 110 may further include a torsion spring. When the solder joints 114 of the varistor 110 fail, the fusing rod 120 may disengage from the first part 132 of the compression rod assembly 130 under the action of the torsion spring, thereby allowing the compression rod assembly 130 to move under the action of the first spring 140. Preferably, the alarm system 110 may further include a limiting member disposed on a side of the pressing plate 150 away from the compression rod assembly 130 (e.g., Figure 1 the lower side shown) to limit the excessive movement of the pressing plate 150 toward the button 182 of the microswitch 180 to prevent the pressing plate 150 from excessively pressing the button 182 of the microswitch 180, thereby causing unnecessary damage to the microswitch 180.

[0075] Preferably, the alarm system 100 may further include a PCBA board 190 and an indicator. The PCBA board 190 is electrically connected to the microswitch 180, and the indicator is communicatively coupled to the PCBA board for indicating the state of the microswitch 180. Optionally, the indicator may be a lamp. When the solder joints 114 are normal, the lamp does not emit light. When the solder joints 114 fail, the lamp emits light. It should be understood that the present invention is not intended to limit the specific type of the indicator, and the indicator may also be any other suitable device such as a speaker that can transmit signals to the staff.

[0076] Figure 5 Fig. shows a schematic front view of an alarm system 200 according to a second embodiment of the present invention. The alarm system 200 of the second embodiment has a similar structure to the alarm system 100 of the first embodiment. For the sake of brevity in description, only the differences between the alarm system 200 and the alarm system 100 will be described below, and the same technical features as those of the alarm system 100 will not be repeated.

[0077] As Figure 8As shown, the pressing plate member 250 includes a pressing plate main body 254 and a pressing arm 256. The pressing plate main body 254 has a plurality of through holes 252, and each through hole 252 corresponds to a corresponding pressing rod assembly 230. The pressing plate member 250 may further include a rotating shaft 258, and the pressing plate member 250 can rotate around the rotating shaft 258 to cause the pressing arm 256 to rotate around the rotating shaft 258.

[0078] When the solder joints 214 of all the varistors 210 among the plurality of varistors are in a normal state (as Figure 7 shown), the fusing rod 220 is fixed to the solder joint 214 to block the left and right movement of the pressing rod assembly 230. The other end of the pressing rod assembly 230 further blocks the upward movement of the support member 260, so that the support member 260 does not contact the pressing plate member 250 and cannot push the pressing plate member 250 to rotate upward around the rotating shaft 258, so that the pressing arm 256 of the pressing plate member 250 remains in the position of releasing the button 282 of the microswitch 280, and the microswitch 280 remains in the second state.

[0079] When the solder joint 214 of any one of the plurality of varistors 210 fails (as Figure 6 shown), the fusing rod 220 corresponding to the failed solder joint 214 disengages from the pressing rod assembly 230 and no longer blocks the movement of the pressing rod assembly 230. The pressing rod assembly 230 moves in the first direction (for example, the left and right direction as Figure 5 shown) under the action of the corresponding first spring 240, so that the pressing rod assembly 230 disengages from the abutment against the corresponding support member 260, and the corresponding second spring 270 is released from the compressed state. Since the acting force of the second spring 270 on the pressing plate member 250 is greater than the acting force of the third spring on the pressing plate 250, the support member 260 drives the pressing plate main body 254 of the pressing plate member 250 to rotate and move around the rotating shaft 258 toward the pressing rod assembly 230 (that is, Figure 5 the upward movement around the rotating shaft 258 in ). The upward rotation of the pressing plate main body 254 around the rotating shaft 258 causes the pressing arm 256 to rotate downward around the rotating shaft 258, so that the pressing arm 256 presses down the button 282 of the microswitch 280, and the microswitch 280 is switched from the second state to the first state. Preferably, the length of the pressing arm 256 can be designed according to specific application requirements so that the pressing arm 256 meets the stroke amount required to cause the state switch of the microswitch 280.

[0080] In summary, in the case where the solder joint 114 fails, the pressing plate member 150 of the first embodiment of the present invention moves upward and translates to release the button 282 of the microswitch 180, thereby causing the microswitch 180 to switch from the first state to the second state. In the second embodiment of the present invention, in the case where the solder joint 214 fails, the pressing plate member 250 rotates around the rotation axis 258 (the pressing plate main body 254 rotates upward and the pressing arm 256 rotates downward) to cause the pressing arm 256 to press the button 282 of the microswitch 280, thereby causing the microswitch 280 to switch from the second state to the first state.

[0081] In the first embodiment, the pressing plate main body and the pressing arm of the pressing plate member 150 can form a flat plate extending along the same plane, having the advantages of simple structure and easy manufacturing. However, for a surge protector with a relatively large width ( Figure 4 the up-and-down direction shown), the size of the pressing plate member 150 is also relatively large. The thrust of a single support member 160 on the pressing plate member 150 may be difficult to stably translate the pressing plate member 150, but there may be an undesired swinging movement while causing the pressing plate member 150 to translate (especially when the acting point of the force of the support member 160 on the pressing plate member 150 seriously deviates from the centroid of the pressing plate member 150. For example, the failed solder joint 114 is Figure 4 the lowermost solder joint or the uppermost solder joint in

[0082] In the second embodiment, compared with the translational movement of the pressing plate member 150 in the first embodiment, even if the acting point of the force of the support member 260 on the pressing plate member 250 deviates from the centroid of the pressing plate member 250, this force can still generate a stable torque relative to the rotation axis 258. Therefore, the rotational movement of the pressing plate member 250 around the rotation axis 258 is more reliable, and it is particularly suitable for a surge protector with a relatively large width.

[0083] The present invention has been described in detail with reference to preferred embodiments. However, those skilled in the art can understand that various modifications and variations can be made to the above specific embodiments without departing from the concept of the present invention. Various technical features and structures proposed by the present invention can also be combined without exceeding the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An alarm system, characterized in that: The alarm system is for a surge protector, comprising: A varistor module, comprising a plurality of varistors, each of the varistor having a body and a solder joint protruding from the body; a plurality of fuse bars electrically connected to an external circuit, each of the varistor being configured to be connected to a corresponding fuse bar via the solder joint; A plurality of pressure rod assemblies are respectively arranged around corresponding varistors, and when corresponding welding points are effective, the fuse rod abuts against the pressure rod assemblies to block the movement of the pressure rod assemblies; A pressing plate member, comprising a pressing plate body and a pressing arm, wherein the pressing plate body has a plurality of through holes, each through hole corresponds to a corresponding pressing rod assembly, and the pressing plate body is biased to an initial position under the action of a biasing component; a plurality of support members, each of the support members passing through a corresponding through hole and resting against a corresponding strut assembly when a corresponding weld point is effective; A micro switch, comprising a button and arranged on a side of the pressure plate body away from the pressure rod assembly, wherein the pressure arm presses or releases the button to switch the micro switch between a first state and a second state, wherein when the button is in a pressed state, the micro switch is in the first state, and when the button is in a released state, the micro switch is in the second state; Wherein, when the solder joint of any one of the multiple varistors fails, the corresponding fuse rod detaches from the pressure rod assembly, causing the pressure rod assembly to move along the first direction under the action of the corresponding first driving component, so that the pressure rod assembly detaches from the abutment with the corresponding support member, so that the support member causes the pressure plate body to move toward the pressure rod assembly under the action of the corresponding second driving component, causing the pressure arm to press or release the button.

2. The alarm system according to claim 1, characterized in that: The pressure plate member further includes a rotation axis, and the pressure plate member is rotatable about the rotation axis to cause the pressure arm to rotate about the rotation axis.

3. The alarm system according to claim 2, characterized in that: The pressure plate body moves toward the pressure lever assembly causing the pressure arm to press the button.

4. The alarm system according to claim 1, characterized in that: The pressing plate body and the pressing arm form a flat plate extending along the same plane.

5. The alarm system according to claim 4, characterized in that: Movement of the pressure plate body toward the pressure lever assembly causes the pressure arm to release the button.

6. The alarm system according to claim 4, characterized in that: A limiting component is also included, which is arranged on a side of the pressing plate body away from the pressing rod assembly to limit excessive movement of the pressing arm toward the button.

7. The alarm system according to claim 1, characterized in that: The first driving member is a first spring extending in the first direction, and the first spring abuts against the corresponding plunger assembly and is configured to bias the corresponding plunger assembly in the first direction.

8. The alarm system according to claim 1, characterized in that: The second driving member is a second spring extending in a second direction perpendicular to the first direction, and the second spring is configured to bias the corresponding support member toward the corresponding piezoresistors.

9. The alarm system according to claim 1, characterized in that: The biasing member is a third spring.

10. The alarm system according to claim 1, characterized in that Each of the support members has a boss protruding perpendicularly to the second direction, and the boss is arranged on a side of the pressure plate body away from the pressure rod assembly. When the welding point fails, the boss abuts against the pressure plate body under the action of the second spring.

11. The alarm system according to claim 1, characterized in that: The pressure rod assembly includes a first part and a second part. When the corresponding welding point is effective, the fuse rod abuts against the first part of the corresponding pressure rod assembly, each of the first springs abuts against the first part of the corresponding pressure rod assembly, and each of the support members abuts against the second part of the corresponding pressure rod assembly, and the first part and the second part form a T-shaped structure.

12. The alarm system according to claim 1, characterized in that The soldering point is arranged on a side of the varistor away from the supporting member.

13. The alarm system according to claim 11, characterized in that It also includes a torsion spring. When the welding point fails, the fuse rod is separated from the first part of the pressure rod assembly under the action of the torsion spring, thereby allowing the pressure rod assembly to move under the action of the first spring.

14. The alarm system according to claim 1, characterized in that It also includes a PCBA board, which is electrically connected to the micro switch.

15. The alarm system according to claim 14, characterized in that An indicator is also included, which is communicatively connected to the PCBA board and is used to indicate the state of the micro switch.

16. The alarm system according to claim 11, characterized in that The indicator shown is a light that illuminates when the weld fails and does not illuminate when the weld is valid.

17. A surge protector, characterized in that: Comprising an alarm system according to any one of claims 1 to 16.

18. The surge protector according to claim 17, characterized in that: Four varistors are included, three of which are connected to the live wire and the other is connected to the neutral wire.

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