CN218782992U - Thermal release mechanism and surge protection device - Google Patents

Abstract

The embodiment of the application provides a hot disengagement mechanism and surge protector, and hot disengagement mechanism includes: lock pin, piezo-resistor, metal break away from piece and push rod. The piezoresistor is placed on a first plate surface of the inserting core, the metal separation sheet and the push rod are placed on a second plate surface of the inserting core, and the first plate surface and the second plate surface are two opposite surfaces of the inserting core. The first pin of the piezoresistor penetrates through the inserting core to be connected with the first end of the metal separation sheet, and a low-temperature welding point is formed at the joint. The insert core is provided with a first limiting surface, the first end of the push rod is abutted to the second end of the metal separation sheet, and the second end of the push rod is abutted to the first limiting surface. When the low-temperature welding point is heated and melted, the push rod pushes the metal separation sheet to move towards the direction far away from the first pin of the piezoresistor, so that the first pin of the piezoresistor is connected with the metal separation sheet in an open mode. In this way, the connection between the metal release sheet and the varistor can be completely broken, so that the thermal trip is reliable.

Description

Thermal release mechanism and surge protection device

Technical Field

The embodiment of the application relates to the field of over-current protection, in particular to a thermal release mechanism and a surge protection device.

Background

A surge protector is a commonly used low voltage protection device, which is in a high impedance state under normal conditions. If the voltage is too high due to lightning strike induction, capacitive load connection and inductive load disconnection, it will conduct in a very short time to lead the lightning current or overvoltage to earth through the earth wire, so as to protect the electric equipment in the power system.

In the prior art, when a large current is instantaneously short-circuited or abnormal heating is caused by continuous increase of leakage current after deterioration of a surge protector, low-temperature welding points are melted. However, the connection between the metal release sheet and the piezoresistor cannot be completely disconnected, so that the thermal tripping is unreliable, and certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present application provide a thermal trip mechanism and a surge protector that overcome or at least partially solve the above-mentioned problem of unreliable thermal trip.

According to a first aspect of embodiments of the present application, there is provided a thermal disengaging mechanism comprising: lock pin, piezo-resistor, metal break away from piece and push rod. The piezoresistor is placed on a first plate surface of the inserting core, the metal separation sheet and the push rod are placed on a second plate surface of the inserting core, and the first plate surface and the second plate surface are two opposite surfaces of the inserting core. The first pin of the piezoresistor penetrates through the inserting core to be connected with the first end of the metal separation sheet, and a low-temperature welding point is formed at the connection part. The insert core is provided with a first limiting surface, the first end of the push rod is abutted to the second end of the metal separation sheet, and the second end of the push rod is abutted to the first limiting surface. When the low-temperature welding point is heated and melted, the push rod pushes the metal separation sheet to move towards the direction far away from the first pin of the piezoresistor, so that the first pin of the piezoresistor is connected with the metal separation sheet in an open mode.

In this embodiment, when the low-temperature welding point is not heated to be melted, the first end of the push rod is abutted against the second end of the push rod of the metal separation sheet and the first limiting surface, the push rod is stressed in a balanced manner, and the push rod is in an elastic deformation state; when the low-temperature welding point is heated and melted, the force from the metal separation sheet on the push rod is smaller than the force from the first limiting surface on the push rod, and the push rod is restored to the original shape from the elastic deformation state, so that the metal separation sheet is pushed to move towards the direction far away from the first pin of the piezoresistor, and the first pin of the piezoresistor is connected with the metal separation sheet in an open mode. Therefore, the connection between the metal separation sheet and the piezoresistor can be completely disconnected, so that the thermal trip is reliable.

In an optional mode, the second end of the push rod is provided with an elastic piece, and the elastic piece is abutted against the first limiting surface.

In this embodiment, when the low temperature welding point is not heated and melted, the elastic member is in a compressed state, and after the low temperature welding point is heated and melted, under the elastic force of the elastic member, the push rod can push the metal separation sheet to move in the direction away from the first pin of the piezoresistor, so that the first pin of the piezoresistor and the metal separation sheet are disconnected.

In an optional mode, the second face of the inserting core is provided with a slide way, the slide way is arranged along the sliding direction parallel to the push rod, the push rod is further connected with a slide block, the slide block is installed on the slide way, and after the low-temperature welding point is heated and melted, the push rod pushes the metal separation sheet to move towards the direction of the first pin far away from the piezoresistor along the slide way.

In this embodiment, the slide can provide the guide effect for the push rod to the push rod promotes the metal to break away from the piece and removes to the direction of keeping away from piezo-resistor's first pin better.

In an optional mode, the second plate surface is further provided with a limiting assembly, and the limiting assembly is used for limiting the movement range of the sliding block.

In an optional mode, the limiting assembly comprises a second limiting surface, a third limiting surface and a fourth limiting surface, the second limiting surface and the third limiting surface are arranged on two sides of the slide in parallel, the first end of the push rod is far away from the second limiting surface and the third limiting surface, the fourth limiting surface is parallel to the second limiting surface and the third limiting surface, the fourth limiting surface is arranged on the slide, and the fourth limiting surface is arranged close to the first end of the push rod.

In this embodiment, through setting up spacing face of second, the spacing face of third and the spacing face of fourth, the motion range of restriction slider to prevent that the slider from breaking away from the slide and sliding, and then avoid the push rod of being connected with the slider can't promote the metal and break away from the piece and remove to the direction of keeping away from piezo-resistor's first pin, lead to piezo-resistor's first pin and the unable disconnection of metal break away from the piece.

In an optional mode, the first end face of the inserting core is provided with an indicating port, and the push rod is further connected with an indicating piece. When the low temperature welding point did not melt, the indicator sheltered from the instruction mouth, and after the low temperature welding point was heated and was melted, the indicator removed along with the push rod, and the instruction mouth staggers with the indicator, and the instruction mouth exposes.

In this embodiment, through the indicating function of the indicating piece and the indicating port, a user can determine whether the thermal trip of the thermal trip mechanism occurs.

In an optional mode, the thermal release mechanism further comprises a first pin and a second pin, the first pin and the second pin are both arranged on the second end face of the ferrule, the first pin is connected with the second pin of the piezoresistor, the second pin is connected with the metal release sheet, and the first end face and the second end face are opposite.

According to a second aspect of embodiments of the present application, there is provided a surge protector device including a base, and a thermal release mechanism provided in the first aspect of the present application, wherein a first pin of the thermal release mechanism and a second pin of the thermal release mechanism are inserted into the base, the first pin is connected to a power line, and the second pin is connected to a ground line.

In this embodiment, current may flow from the power line into the first pin, the varistor, the metal release sheet, and the second pin, and out of the ground line, thereby protecting the electrical device in the power system.

In an optional mode, the base is provided with a button, the push rod is further connected with a pressing piece, and the second end face of the inserting core is provided with a notch. When the surge protector works normally, the pressing piece is connected with the button in an abutting mode, and the button sends a normal working signal of the surge protector to the remote control module. When surge protector work is unusual, the pressing part misplaces with the button, and the button stretches into heat and breaks away from the mechanism along the breach, and the button sends the unusual working signal of surge protector to the remote control module.

In this embodiment, after the low temperature welding point is heated and melts, the push rod removes and drives the pressing part removal, leads to pressing part and button dislocation, and the button can stretch into heat release mechanism along the breach, sends the unusual working signal of surge protector to remote control module, and so, the user can long-rangely confirm that heat release mechanism has taken place the thermal trip.

In an alternative mode, the surge protector further comprises a housing for accommodating the thermal release mechanism, the housing being provided with an indicator window opposite to the indicator opening of the ferrule.

In this embodiment, the housing can play the guard action to the thermal trip mechanism, and the user can confirm through the instruction window whether the thermal trip has taken place for the thermal trip mechanism.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a surge protector provided in an embodiment of the present application when thermal trip does not occur.

Fig. 2 is a schematic structural diagram of a surge protector after thermal trip is generated according to an embodiment of the present application.

Description of reference numerals:

01. inserting a core; 011. a first limit surface; 012. an indicator port; 013. a second limiting surface; 014. a third limiting surface; 015. a fourth limiting surface; 016. a fifth limiting surface; 017. a sixth limiting surface; 018. a seventh limiting surface; 02. a metal release sheet; 021. a first end of a metal release sheet; 022. a second end of the metal release tab; 03. a push rod; 031. a first end of the push rod; 04. a first pin of the piezoresistor; 05. an elastic member; 06. a slideway; 07. a slider; 08. an indicator; 09. a first pin; 10. a second pin;

11. a second pin of the piezoresistor; 12. a base; 13. a button; 14. a pressing member; 15. the window is indicated.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the drawings are intended to cover, but not to exclude, other elements. The word "a" or "an" does not exclude a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following description is given with the directional terms in the drawings and is not intended to limit a specific structure of a thermal release mechanism and a surge protector of the present application. For example, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for the convenience of description and simplicity of description only, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

Some embodiments of the present application provide a thermal release mechanism and a surge protection device, please refer to fig. 1 and fig. 2, where fig. 1 is a schematic structural diagram of a surge protection device provided in an embodiment of the present application when a thermal trip does not occur, and fig. 2 is a schematic structural diagram of a surge protection device provided in an embodiment of the present application after a thermal trip occurs.

As shown in fig. 1 and fig. 2, an embodiment of the present application provides a thermal disengaging mechanism, including: the plug core 01, the piezoresistor, the metal release sheet 02 and the push rod 03. For example, the push rod 03 may be made of an elastic material, the ferrule 01 may be square, and the ferrule 01 is used for placing a chip, for example, in this embodiment, the chip refers to a varistor. The ferrule 01 includes two plate surfaces and four end surfaces. The piezoresistor is placed on a first plate surface of the ferrule 01, the metal separation sheet 02 and the push rod 03 are placed on a second plate surface of the ferrule 01, and the first plate surface and the second plate surface are two opposite surfaces of the ferrule 01. The first pin 04 of the piezoresistor penetrates through the ferrule 01 to be connected with the first end 021 of the metal release sheet 02, and a low-temperature welding point is formed at the connection part. When the large current is short-circuited instantly or the abnormal heating is caused by the continuous increase of leakage current after the degradation of the surge protector, the low-temperature welding point is melted firstly so as to facilitate the thermal tripping of the thermal release mechanism.

The ferrule 01 is provided with a first limit surface 011, a first end 031 of the push rod 03 abuts against a second end 022 of the metal separation sheet 02, and a second end of the push rod 03 abuts against the first limit surface 011. When the low-temperature welding point is heated and melted, the push rod 03 pushes the metal separation sheet 02 to move towards the direction away from the first pin 04 of the piezoresistor, so that the first pin 04 of the piezoresistor is disconnected with the metal separation sheet 02.

In this embodiment, when the low temperature welding point is not heated and melted, the first end 031 of the push rod 03 is abutted against the second end 022 of the metal separation sheet 02, the second end of the push rod 03 is abutted against the first limit surface 011, the push rod 03 is subjected to a force balance, and the push rod 03 is in an elastic deformation state at this time. When the low-temperature welding point is heated and melted, the force from the metal separation sheet 02 to the push rod 03 is smaller than the force from the first limit surface 011 to the push rod 03, and the push rod 03 is restored to the original state from the elastic deformation state, so that the metal separation sheet 02 is pushed to move towards the direction away from the first pin 04 of the piezoresistor, and the first pin 04 of the piezoresistor is disconnected from the metal separation sheet 02. In this way, the connection between the metal release sheet 02 and the varistor can be completely broken, so that the thermal trip is reliable.

In one embodiment, in order to facilitate the push rod 03 to push the metal separation sheet 02 to move in a direction away from the first pin 04 of the varistor, the second end of the push rod 03 may be provided with an elastic member 05, and the elastic member 05 abuts against the first limit surface 011.

When the low-temperature welding point is not heated and melted, the elastic piece 05 is in a compression state, and after the low-temperature welding point is heated and melted, under the action of the elastic piece 05, the push rod 03 can push the metal separation sheet 02 to move towards the direction away from the first pin 04 of the piezoresistor, so that the first pin 04 of the piezoresistor is disconnected with the metal separation sheet 02.

In practical applications, it is considered that the push rod 03 may be displaced during pushing the metal releasing piece 02, so that the first pin 04 of the varistor and the metal releasing piece 02 cannot be disconnected. Therefore, the second plate surface of the ferrule 01 can be provided with a slide way 06, the slide way 06 is arranged along the sliding direction parallel to the push rod 03, the push rod 03 is further connected with a slide block 07, the slide block 07 is installed on the slide way 06, and after the low-temperature welding point is heated and melted, the push rod 03 can push the metal separation sheet 02 along the slide way 06 to move towards the direction away from the first pin 04 of the piezoresistor.

In this way, the sliding channel 06 can provide a guiding function for the push rod 03, so that the push rod 03 can better push the metal separation sheet 02 to move in a direction away from the first pin 04 of the varistor.

In one embodiment, the second plate surface may further be provided with a limiting component for limiting the movement range of the sliding block 07.

Specifically, referring to fig. 1 and 2, the limiting assembly includes a second limiting surface 013, a third limiting surface 014 and a fourth limiting surface 015, the second limiting surface 013 and the third limiting surface 014 are arranged in parallel on two sides of the sliding way 06, the second limiting surface 013 and the third limiting surface 014 are arranged at a first end 031 of the push rod 03 in a far away manner, the fourth limiting surface 015 is arranged in parallel with the second limiting surface 013 and the third limiting surface 014, the fourth limiting surface 015 is arranged on the sliding way 06, and the fourth limiting surface 015 is arranged close to the first end 031 of the push rod 03.

In this embodiment, through setting up spacing face 013 of second, spacing face 014 of third and the spacing face 015 of fourth, restriction slider 07's motion range to prevent that slider 07 from breaking away from the slide 06 and sliding, and then avoid the push rod 03 of being connected with slider 07 can't promote the metal and break away from piece 02 and remove to the direction of keeping away from piezo-resistor's first pin 04, lead to piezo-resistor's first pin 04 and the metal and break away from the unable disconnection of piece 02.

It is worth pointing out that the thermal release mechanism that this embodiment provided is equipped with the housing outside usually to the protection thermal release mechanism, at this moment, can make spacing subassembly be higher than push rod 03 setting, like this, spacing subassembly is closer to the inner wall of housing than push rod 03, and when the housing received outside extrusion, spacing subassembly can play the supporting role, avoids the inner wall of housing and push rod 03 contact, and then influences the dropout of thermal release mechanism.

As shown in fig. 1 and 2, the first end surface of the ferrule 01 is provided with an indicator port 012, and the push rod 03 is further connected with an indicator 08. When the low-temperature welding point is not melted, the indicating piece 08 shields the indicating port 012 and is used for indicating that the thermal tripping mechanism is not thermally tripped; when the low-temperature welding point is heated and melted, the indicating piece 08 moves along with the push rod 03, the indicating port 012 and the indicating piece 08 are staggered, and the indicating port 012 is exposed and used for indicating the thermal tripping of the thermal tripping mechanism.

For example, the indicator opening 012 may be red, and the indicator 08 may be green. When the low-temperature welding point is not melted, the indicating piece 08 shields the indicating port 012, and a user can observe the green indicating piece 08, so that the thermal tripping of the thermal tripping mechanism is determined not to occur; after the low-temperature welding point is heated and melted, the push rod 03 pushes the metal separation sheet 02 to move towards the direction away from the first pin 04 of the piezoresistor, the indicating piece 08 connected with the push rod 03 moves along with the push rod 03, the indicating port 012 and the indicating piece 08 are staggered, the indicating port 012 is exposed, and a user can observe the red indicating port 012 to determine that the thermal release mechanism is thermally released.

It is worth pointing out that the thermal release mechanism provided in the embodiment of the present application may further include a fifth limiting surface 016, wherein the fifth limiting surface 016 is disposed perpendicular to the sliding track 06, the fifth limiting surface 016 is disposed on a side of the indication member 08 away from the metal release sheet 02, and the fifth limiting surface 016 is used for limiting a moving range of the indication member 08.

In practical applications, the thermal release mechanism provided by the embodiment of the present application further includes a first pin 09 and a second pin 10. The first pin 09 and the second pin 10 are both arranged on the second end face of the ferrule 01, the first pin 09 is connected with the second pin 11 of the piezoresistor, and the second pin 10 is connected with the metal release sheet 02, wherein the first end face is opposite to the second end face. Current can flow from the first pin 09, through the varistor and metal release tab 02, and out the second pin 10.

It should be noted that, as shown in fig. 1 and fig. 2, the second pin 10 and the metal releasing sheet 02 may also be an integrally formed structure, and compared with the prior art, a flexible wire is not required to be arranged between the second pin 10 and the metal releasing sheet 02, so that the surge protector has a simple process, low cost and high assembly efficiency.

In another embodiment of the present application, there is also provided a surge protector device comprising a base 12, and a thermal detachment mechanism as provided in the above-described embodiments of the present application. The first pin 09 of the thermal release mechanism and the second pin 10 of the thermal release mechanism are inserted into the base 12, the first pin 09 is connected with a power line, and the second pin 10 is connected with a ground line. Current can flow from the power supply line into the first pin 09, the varistor, the metal release sheet 02, and the second pin 10, and out of the ground line, thereby protecting the electrical devices in the power system.

In an alternative mode, the base 12 is provided with a button 13, the push rod 03 is further connected with a pressing piece 14, and the second end face of the inserting core 01 is provided with a notch. When the surge protector normally works, the pressing piece 14 abuts against the button 13, and the button 13 sends a normal working signal of the surge protector to the remote control module. When the surge protector works abnormally, the pressing piece 14 and the button 13 are staggered, the button 13 extends into the thermal separation mechanism along the notch, and the button 13 sends an abnormal working signal of the surge protector to the remote control module.

In this embodiment, after the low-temperature welding point is heated and melted, push rod 03 moves and drives pressing piece 14 to move, resulting in the dislocation of pressing piece 14 and button 13, button 13 can stretch into heat release mechanism along the breach, sends the unusual working signal of surge protector to the remote control module, and so, the user can confirm that heat release mechanism has taken place the thermal trip remotely.

In practical applications, the surge protector may further include a sixth position-limiting surface 017 and a seventh position-limiting surface 018. The sixth limiting surface 017 is perpendicular to the slide way 06, the sixth limiting surface 017 is arranged on one side of the pressing piece 14 far away from the metal disengaging piece 02, and the sixth limiting surface 017 and the fifth limiting surface 016 are distributed on two sides of the slide way 06. The seventh limiting surface 018 is arranged parallel to the sliding channel 06, the seventh limiting surface 018 is located between the pressing piece 14 and the second end surface of the ferrule 01, and the sixth limiting surface 017 and the seventh limiting surface 018 are both used for limiting the moving range of the pressing piece 14, and further, the moving range of the push rod 03 can be limited.

In one embodiment, the surge protector further comprises a housing for housing the thermal release mechanism to protect the thermal release mechanism. The casing may be provided with an indication window 15, and the indication window 15 is opposite to the indication port 012 of the ferrule 01, and the user can determine whether the thermal release mechanism is thermally released through the indication window 15 as described in the foregoing embodiment in relation to the indication port 012 and the indication member 08.

Those of skill in the art will understand that while some embodiments herein include certain features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.

Claims (10)

1. A thermal disengaging mechanism, the mechanism comprising: the device comprises an inserting core, a piezoresistor, a metal separation sheet and a push rod;

the piezoresistor is placed on a first plate surface of the inserting core, the metal separation sheet and the push rod are placed on a second plate surface of the inserting core, and the first plate surface and the second plate surface are two opposite surfaces of the inserting core;

a first pin of the piezoresistor penetrates through the inserting core to be connected with a first end of the metal separation sheet, and a low-temperature welding point is formed at the connection part;

the insert core is provided with a first limiting surface, the first end of the push rod is abutted with the second end of the metal separation sheet, and the second end of the push rod is abutted with the first limiting surface;

when the low-temperature welding point is heated and melted, the push rod pushes the metal separation sheet to move towards the direction far away from the first pin of the piezoresistor, so that the first pin of the piezoresistor is connected with the metal separation section.

2. The thermal release mechanism of claim 1, wherein the second end of the push rod is provided with an elastic member, and the elastic member abuts against the first limiting surface.

3. The thermal release mechanism according to claim 1, wherein a slide is provided on the second plate surface of the ferrule, the slide is arranged in a direction parallel to a sliding direction of the push rod, the push rod is further connected with a slider, the slider is mounted on the slide, and when the low-temperature soldering point is melted by heat, the push rod pushes the metal release sheet to move in a direction away from the first pin of the varistor along the slide.

4. The thermal release mechanism of claim 3, wherein said second plate surface further comprises a limiting component for limiting the range of motion of said slider.

5. The thermal release mechanism of claim 4, wherein the limiting component comprises a second limiting surface, a third limiting surface and a fourth limiting surface, the second limiting surface and the third limiting surface are disposed in parallel on two sides of the sliding way, the second limiting surface and the third limiting surface are disposed away from the first end of the push rod, the fourth limiting surface is disposed in parallel with the second limiting surface and the third limiting surface, the fourth limiting surface is disposed on the sliding way, and the fourth limiting surface is disposed near the first end of the push rod.

6. The thermal release mechanism according to claim 1, wherein the first end face of the ferrule is provided with an indicating port, and the push rod is further connected with an indicating member;

when the low-temperature welding point is not melted, the indicating piece shields the indicating opening, when the low-temperature welding point is heated and melted, the indicating piece moves along with the push rod, the indicating opening is staggered with the indicating piece, and the indicating opening is exposed.

7. The thermal trip mechanism according to claim 6, further comprising a first prong and a second prong, both disposed on a second end face of the ferrule, the first prong connected to a second pin of the varistor, the second prong connected to the metal trip tab, wherein the first end face and the second end face are opposite.

8. A surge protector device, characterized in that it comprises a base and a thermal release mechanism according to any of claims 1-7, wherein a first prong of the thermal release mechanism and a second prong of the thermal release mechanism are inserted into the base, the first prong being connected to a power line, and the second prong being connected to a ground line.

9. A surge protector according to claim 8, wherein the base is provided with a button, the push rod is further connected with a pressing piece, and the second end face of the ferrule is provided with a notch;

when the surge protector works normally, the pressing piece abuts against the button, and the button sends a normal working signal of the surge protector to the remote control module;

when the surge protector works abnormally, the pressing piece is staggered with the button, the button is arranged along the notch and extends into the thermal separation mechanism, and the button sends an abnormal working signal of the surge protector to the remote control module.

10. A surge protector device according to claim 8, further comprising a housing for accommodating the thermal release mechanism, the housing being provided with an indicator window opposite the indicator opening of the ferrule.

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