Thermal tripping assembly and surge protector

Abstract

The utility model relates to the field of surge protector equipment, and especially relates to a thermal tripping assembly and a surge protector. The thermal tripping assembly provided by the utility model is used for thermal tripping and backup protection of a surge protector, and comprises a heating element and a tripping assembly, the tripping assembly comprises a belt body and a connecting assembly, the connecting assembly is located between a lightning protection element and a grounding circuit, the connecting assembly is connected with the belt body through a fuse link, and the fuse link is connected with the heating element. The belt body is matched with the heating piece, and the heating piece is used for being electrified to generate heat to fuse the fusing piece when power frequency current passes through a grounding circuit where the lightning protection element is located.

Description

Technical Field

[0001] The utility model relates to the field of surge protector equipment, in particular to a thermal trip component and a surge protector. Background Art

[0002] When the surge protector is used in daily life, the lightning protection element inside it will produce loss, which will cause leakage current to flow through the surge protector. The function of the thermal release assembly is to disconnect the surge protector from the circuit in a timely and reliable manner when the surge protector is subjected to a continuous small current shock. Specifically, the first connecting piece is connected to a varistor or other lightning protection element, and the second connecting piece is connected to a grounded phase line, or is electrically connected to the base of the surge protector by plugging, etc., so that the lightning protection element and the thermal release assembly are connected in series to the ground circuit. The first connecting piece and the second connecting piece are electrically connected through a belt body. When the thermal release assembly is subjected to a continuous small current flow, the hot melt structure between the belt body and the first connecting piece melts under the action of the current, causing the belt body to be separated from the first connecting piece, thereby blocking the connection of the grounding circuit. In order to realize the backup protection of the surge protector, the general surge protector is also connected in series with the backup protection device. The function of the backup protection device is to block the connection of the grounding circuit by disconnecting its internal circuit for a large power frequency leakage current. Existing backup protection devices are generally independently arranged devices, for example, implemented by a mechanical structure or by a fuse, and require a set of disconnecting mechanisms independent of the surge protector. Therefore, the thermal tripping of the surge protector and the implementation mechanism of its backup protection function in the traditional solution are relatively complicated, making it difficult to achieve integration and miniaturization of the surge protector and the backup protection device. Utility Model Content

[0003] On the one hand, the utility model provides a thermal trip assembly that can improve the integration and miniaturization of surge protectors and backup protection devices;

[0004] On the other hand, the utility model provides a surge protector.

[0005] The thermal trip assembly provided by the utility model is used for the thermal tripping and backup protection of a surge protector, and comprises a heating element and a trip assembly, wherein the trip assembly comprises a belt body and a connecting assembly, wherein the connecting assembly is located between a lightning protection element and a grounding circuit, wherein the connecting assembly is connected to the belt body through a fuse, wherein the belt body cooperates with the heating element, and the heating element is used for generating heat to melt the fuse when an industrial frequency current passes through the grounding circuit where the lightning protection element is located.

[0006] Furthermore, the heating element is connected to the belt body, and the heating element can drive the belt body to be separated from the connecting assembly under the action of the elastic element.

[0007] Furthermore, the connecting assembly includes a first connecting piece connected to the lightning protection element and a second connecting piece connected to the grounding circuit, a connecting gap is formed between the first connecting piece and the second connecting piece, the strip body has relative contact ends and connecting ends, the contact end of the strip body is located in the connecting gap, and is respectively connected to the first connecting piece and the second connecting piece through a fuse, the connecting end of the strip body is sleeved on the heating element, and the elastic element is sleeved outside the heating element.

[0008] Furthermore, the heating element is connected to the power module via a first switch, and the first switch can be operated by an electrical signal of the grounding circuit cable.

[0009] Furthermore, the first switch includes a current transformer and an electromagnetic trip switch, the current transformer cooperates with the grounding circuit, the electromagnetic trip switch is arranged on the circuit between the heating element and the power module, and the current transformer is used to control the opening or closing of the electromagnetic trip switch according to the electrical signal of the grounding circuit.

[0010] Furthermore, a second switch is provided between the heating element and the power module, and the second switch cooperates with the heating element. When the connecting component is connected to the heating element, the second switch is in a closed state, and when the connecting component is disconnected from the heating element, the second switch is in an open state.

[0011] Furthermore, the second switch includes a switch element arranged on the heating element and a switch position arranged in series with the first switch, and the switch element moves with the heating element to control the opening or closing of the switch position.

[0012] Furthermore, a second tube body is disposed outside the heating element, and the heating element and the second tube body are slidably matched, and an annular gap for arranging the elastic element is formed between the second tube body and the heating element.

[0013] Furthermore, the thermal release assembly also includes a flip-up piece, which cooperates with the heating element. When the connecting assembly is connected to the heating element, the flip-up piece is in a first state, and when the connecting assembly is disconnected from the heating element, the second switch is in a second state.

[0014] On the other hand, the surge protector provided by the utility model includes a lightning protection element arranged on a grounding circuit, and the thermal release assembly described in any one of the above items is connected in series with the lightning protection element on the grounding circuit.

[0015] Beneficial Effects

[0016] The backup protection function and thermal tripping function in this solution are both realized through the cooperation between the belt body, the connecting component and the heating element. Therefore, compared with the traditional solution, the backup protection function itself has a set of independent fuse mechanisms or disconnection mechanisms, which is conducive to the miniaturization of the surge protector. In addition, the fuse in this solution is arranged in series on the grounding circuit where the lightning protection element is located. When the power frequency current flows through the grounding circuit, the heating element generates heat and melts the fuse. Compared with the traditional solution, when the power frequency current flows through the backup protection device, the fuse in the backup protection device heats up and melts. The fuse in this solution cooperates with the heating element, and the heat generated by the heating element is used to melt. When the power frequency current flows through the grounding circuit, the heating element generates heat to melt the fuse. The heating element in this solution can provide a higher melting temperature through the selection of materials or other heating specifications. Therefore, a fuse with a higher rated temperature can be selected, thereby increasing the rated temperature between the belt body and the connecting component, thereby preventing the impact current from disconnecting the electrical connection between the belt body and the connecting component. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is an overall schematic diagram of the thermal release assembly provided by the embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the local structure of the trip assembly provided by the embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the heating element provided in the embodiment of the utility model.

[0021] Figure numbers: 1-heating element; 2-belt body; 3-connecting assembly; 4-tripping assembly; 5-current transformer; 6-electromagnetic tripping switch; 7-lightning protection element; 8-first connecting piece; 9-second connecting piece; 10-connecting end; 11-contact end; 12-connecting gap; 13-second tube body; 14-elastic piece; 15-annular gap. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0023] Example

[0024] like Figures 1 to 3 A thermal trip assembly shown is used for thermal tripping and backup protection of a surge protector, including a heating element 1 and a trip assembly 4. The trip assembly 4 includes a belt body 2 and a connecting assembly 3. The connecting assembly 3 is located between a lightning protection element 7 and a grounding circuit. The connecting assembly 3 is connected to the belt body 2 through a fuse. The belt body 2 cooperates with the heating element 1. The heating element 1 is used to generate heat to melt the fuse when the grounding circuit where the lightning protection element 7 is located passes through the power frequency current.

[0025] When the surge protector is used in daily life, the lightning protection element 7 inside it will produce loss, so that leakage current flows through the surge protector. The function of the thermal release assembly is to disconnect the surge protector from the circuit in a timely and reliable manner when the surge protector is subjected to a continuous small current impact. Specifically, the first connecting piece 8 is connected to the varistor or other lightning protection element 7, and the second connecting piece 9 is connected to the grounded phase line, or is electrically connected to the base of the surge protector by plugging, etc., so that the lightning protection element 7 and the thermal release assembly are connected in series to the ground circuit. The first connecting piece 8 and the second connecting piece 9 are electrically connected through the belt body 2. When the thermal release assembly is subjected to a continuous small current flow, the hot melt structure between the belt body 2 and the first connecting piece 8 melts under the action of the current, causing the belt body 2 to be separated from the first connecting piece 8, thereby blocking the connection of the grounding circuit. In order to realize the backup protection of the surge protector, the general surge protector is also connected in series with the backup protection device. The function of the backup protection device is to block the connection of the grounding circuit by disconnecting its internal circuit for a large power frequency leakage current. Existing backup protection devices are generally independently arranged devices, for example, implemented by a mechanical structure or by a fuse, and require a set of disconnecting mechanisms independent of the surge protector. Therefore, the thermal tripping of the surge protector and the implementation mechanism of its backup protection function in the traditional solution are relatively complicated, making it difficult to achieve integration and miniaturization of the surge protector and the backup protection device.

[0026] In this solution, the connecting component 3 is located between the lightning protection element 7 of the surge protector and the grounding circuit, and is used to connect the lightning protection element 7 in series to the grounding circuit. The belt body 2 and the connecting component 3 are connected through a fuse, so that the belt body 2 is connected in series between the lightning protection element 7 and the grounding circuit. When heat is generated by leakage current on the belt body 2, the fuse can melt, thereby disconnecting the electrical connection between the connecting component 3 and the belt body 2, thereby realizing the thermal tripping function.

[0027] The belt body 2 in this solution cooperates with the heating element 1. The heat generated by the heating element 1 can be transferred to the belt body 2 to melt the fuse, so that the electrical connection between the connecting component 3 and the belt body 2 is disconnected. The heating element 1 is used to generate heat when the grounding circuit where the lightning protection element 7 is located passes through the power frequency current, and the fuse is melted by powering on. The fuse cooperates with the belt body 2. The heating element 1 can generate heat when powering on, and the heat is transferred to the belt body 2, so that the fuse between the belt body 2 and the connecting component 3 is melted. When the grounding circuit where the lightning protection element 7 is located passes through the power frequency current, the heating element 1 is powered on to generate heat to melt the fuse, and the electrical connection between the connecting component 3 and the belt body 2 is disconnected, thereby realizing the backup protection function.

[0028] The backup protection function and thermal tripping function in this solution are both realized by the cooperation between the belt body 2, the connecting component 3 and the heating element 1. Therefore, compared with the traditional solution, the backup protection function itself is reduced by a set of independent fuse mechanisms or disconnection mechanisms, which is conducive to the miniaturization of the surge protector. In addition, the fuse in this solution is arranged in series on the grounding circuit where the lightning protection element 7 is located. When the power frequency current flows through the grounding circuit, the heating element 1 generates heat and melts the fuse. Compared with the traditional solution, when the power frequency current flows through the backup protection device, the fuse in the backup protection device heats up and melts. The fuse in this solution cooperates with the heating element 1, and the heat generated by the heating element 1 is used to melt. When the power frequency current flows through the grounding circuit, the heating element 1 generates heat to melt the fuse. The heating element 1 in this solution can provide a higher melting temperature through the selection of materials or other heating specifications. Therefore, a fuse with a higher rated temperature can be selected, thereby increasing the rated temperature between the belt body 2 and the connecting component 3, thereby preventing the impact current from disconnecting the electrical connection between the belt body 2 and the connecting component 3.

[0029] In an optional embodiment, the heating element 1 is connected to the belt body 2 , and the heating element 1 can drive the belt body 2 to separate from the connecting component 3 under the action of the elastic element 14 .

[0030] The thermal release assembly in the traditional scheme also includes a heating element 1 that abuts against the belt body 2. The surge protector is generally provided with a base, which is used to be connected to the grounding circuit. The lightning protection element 7 and the thermal release assembly of the surge protector are located in the module head of the surge protector. The module head cooperates with the base to realize the series connection of the lightning protection element 7 on the grounding circuit. A signal collection assembly is provided in the base to monitor the state of the thermal release assembly. The signal transmission of the state position of the belt body 2 is realized between the module head and the base through the position of the heating element 1. Specifically, when the belt body 2 is connected to the first connecting piece 8, the belt body 2 is bent from one side of the heating element 1 to the upper part of the heating element 1. The heating element 1 abuts against the belt body 2 under the action of the elastic element 14. The belt body 2 restricts the heating element 1, thereby preventing the heating element 1 from continuing to move under the action of the elastic element 14. When subjected to a continuous small current flow, the fuse between the belt body 2 and the first connecting piece 8 melts under the action of the current, causing the second end of the belt body 2 to separate from the second connecting piece 9, thereby blocking the connection of the circuit. At this time, the belt body 2 rebounds, and the belt body 2 cannot abut against the heating element 1. Therefore, the heating element 1 moves under the action of the elastic element 14, and there is a corresponding structure in the base that cooperates with the heating element 1. When the heating element 1 moves to the point where it cannot cooperate with the corresponding structure in the base, the base senses that the thermal trip component performs a thermal trip operation at this time.

[0031] Compared with the traditional solution, the heating element 1 in this solution has the function of the heating element 1. Specifically, the heating element 1 is moved by the elastic force of the elastic element 14, so that the heating element 1 can drive the belt body 2 to separate from the connecting component 3. Compared with the traditional fuse that relies on the complete melting of the fuse core to disconnect the circuit, there is a force of the elastic element 14 between the belt body 2 and the connecting component 3 in this solution, and this force can make the connection between the belt body 2 and the connecting component 3 easier to disconnect. For example, a fuse that can withstand an impact current of a current, if this specification of the fuse is applied to the fuse core in the traditional solution, it is necessary for an industrial frequency current of a current to pass through and continue to generate heat for c time to completely melt it; and the belt body 2 in this solution has With the force provided by the elastic member 14, a current less than b is required to continuously generate heat for c time, or less than c time, so that the connection force of the fuse on the strip 2 and the connecting component 3 is less than the force of the elastic member 14. Therefore, under the premise of a certain current and heating time, the material or specification of the fuse can be selected to achieve a larger connection force between the strip 2 and the connecting component 3, and the elastic force of the elastic member 14 is used to overcome the larger connection force, thereby achieving the breaking speed in the traditional solution. The larger connection force between the strip 2 and the connecting component 3 is conducive to overcoming the impact current, thereby avoiding the contradiction between the heat generated by the fuse core caused by the heating of the fuse core itself, the rated current of the fuse core melting and its impact current resistance in the traditional solution.

[0032] Preferably, the belt body 2 and the connecting assembly 3 are low temperature welded to form a fuse.

[0033] In an optional embodiment, the connecting component 3 includes a first connecting plate 8 connected to the lightning protection element 7 and a second connecting plate 9 connected to the grounding circuit, a connecting gap 12 is formed between the first connecting plate 8 and the second connecting plate 9, the strip 2 has relative contact ends 11 and connecting ends 10, the contact end 11 of the strip 2 is located in the connecting gap 12, and is respectively connected to the first connecting plate 8 and the second connecting plate 9 through a fuse, the connecting end 10 of the strip 2 is sleeved on the heating element 1, and the elastic member 14 is sleeved outside the heating element 1.

[0034] The first connecting piece 8 and the second connecting piece 9 are arranged at a relative interval, and a connecting gap 12 is formed between the two. The opposite sides of the connecting gap 12 are the first connecting piece 8 and the second connecting piece 9 respectively. The first connecting piece 8 and the second connecting piece 9 are arranged in parallel along the moving direction of the heating element 1. The two sides of the contact end 11 of the belt body 2 are bent respectively to form abutment pieces, and the abutment pieces are respectively fitted with the first connecting piece 8 and the second connecting piece 9 and connected through a fuse, or there are gaps between the abutment pieces and the corresponding first connecting piece 8 and the second connecting piece 9, and a fuse is provided in the gap, which is connected through the fuse.

[0035] The connection gap 12 is formed by the first connection piece 8 and the second connection piece 9 being arranged opposite to each other, so the heating element 1 can drive the belt body 2 to move in a direction parallel to the first connection piece 8 and the second connection piece 9, so that the belt body 2 moves out of the connection gap 12. The connection end 10 of the belt body 2 is bent to form a pipe structure, and the heating element 1 is inserted into the pipe structure, so that the heating element 1 is fixed to the belt body 2, and the heat generated by the heating element 1 can be conducted to the belt body 2.

[0036] Preferably, the strip 2 is made of copper material, and the contact end 11 and the connection end 10 of the strip 2 are formed by bending copper sheets. The heating element 1 is a heating ceramic tube, and the elastic element 14 is a spring. The spring is sleeved outside the heating ceramic tube to generate an elastic force on the heating ceramic tube. When the strip 2 is located in the connection gap 12, the elastic element 14 is in a deformed state, generating an elastic force on the heating element 1. At this time, since the contact end 11 of the strip 2 is fixed to the first connecting piece 8 and the second connecting piece 9 by a fuse, the elastic force is balanced with the connection force of the fuse. When the fuse melts to the point where its connection force cannot overcome the elastic force of the elastic element 14, the strip 2 is driven by the heating element 1 to move out of the connection gap 12, and the electrical connection between the first connecting piece 8 and the second connecting piece 9 is disconnected.

[0037] In an optional embodiment, the heating element 1 is connected to the power module via a first switch, and the first switch can be operated by an electrical signal of a grounding circuit cable.

[0038] The first switch cooperates with the grounding circuit, and triggers the power-on of the heating element 1 by monitoring the current flowing through the grounding circuit. When a small leakage current passes through the belt body 2, the first switch remains in the off state, and the electrical connection between the connecting component 3 and the belt body 2 is disconnected through the thermal tripping function. When a large power frequency current passes through the grounding circuit where the lightning protection element 7 is located, the heating element 1 is powered on to generate heat to melt the fuse, and the electrical connection between the connecting component 3 and the belt body 2 is disconnected, thereby realizing the backup protection function.

[0039] In an optional embodiment, the first switch includes a current transformer 5 and an electromagnetic trip switch 6, the current transformer 5 cooperates with the grounding circuit, the electromagnetic trip switch 6 is arranged on the circuit between the heating element 1 and the power module, and the current transformer 5 is used to control the opening or closing of the electromagnetic trip switch 6 according to the electrical signal of the grounding circuit.

[0040] The current transformer 5 is mounted on the grounding circuit, and the output end of the current transformer 5 is connected to the electronic switch component, which is arranged on the control circuit. One end of the control circuit is connected to the grounding circuit, and the other end is connected to the electromagnetic end of the electromagnetic trip switch 6. The switch end of the electromagnetic trip switch 6 is arranged on the heating circuit, and one end of the heating circuit is connected to the grounding circuit, and the other end is connected to the heating element 1.

[0041] When a large power frequency current passes through the grounding circuit where the lightning protection element 7 is located, the current transformer 5 sends an electrical signal to the electronic switch component, and the electronic switch component connects to the control circuit, so that the electromagnetic trip switch 6 is closed, and then the heating circuit is connected. The heating element 1 is powered by the grounding circuit to generate heat to melt the fuse, and the electrical connection between the connecting component 3 and the belt body 2 is disconnected, thereby realizing the backup protection function.

[0042] In an optional embodiment, a second switch is provided between the heating element 1 and the power module, and the second switch cooperates with the heating element 1. When the connecting component 3 is connected to the heating element 1, the second switch is in a closed state, and when the connecting component 3 is disconnected from the heating element 1, the second switch is in an open state.

[0043] The second switch is arranged on the heating circuit. When the belt body 2 is located in the connection gap 12, the second switch remains in a closed state. When a large power frequency current passes through the grounding circuit where the lightning protection element 7 is located, the current transformer 5 sends an electrical signal to the electronic switch component. The electronic switch component is connected to the control circuit, so that the electromagnetic trip switch 6 is closed, thereby connecting the heating circuit. The heating element 1 is powered by the grounding circuit to generate heat to melt the fuse. When the fuse melts to the point where its connection force cannot overcome the elastic force of the elastic element 14, the belt body 2 is driven by the heating element 1 to move out of the connection gap 12 under the elastic force of the elastic element 14, and the electrical connection between the first connecting piece 8 and the second connecting piece 9 is disconnected. At the same time, the first switch is disconnected, ensuring that the connection between the heating element 1 and the grounding circuit is disconnected.

[0044] In an optional embodiment, the second switch includes a switch element arranged on the heating element 1 and a switch position arranged in series with the first switch, and the switch element moves with the heating element 1 to control the opening or closing of the switch position.

[0045] The movement of the heating element 1 drives the switch element to cooperate with the switch position to realize the connection and disconnection of the heating circuit.

[0046] In an optional embodiment, a second tube body 13 is disposed outside the heating element 1 , and the heating element 1 and the second tube body 13 are slidably matched, and an annular gap 15 for arranging the elastic element 14 is formed between the second tube body 13 and the heating element 1 .

[0047] In an optional embodiment, the thermal release assembly also includes a flip-up piece, which cooperates with the heating element 1. When the connecting assembly 3 is connected to the heating element 1, the flip-up piece is in a first state. When the connecting assembly 3 is disconnected from the heating element 1, the second switch is in a second state.

[0048] It should be noted that any of the above embodiments is illustrative of the present invention rather than limiting the present invention, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words primary, secondary, previous, and next, etc. does not indicate any order. These words may be interpreted as names.

[0049] The above implementation modes are only suitable for illustrating the present invention, but not for limiting the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A thermal trip assembly for thermal tripping and backup protection of a surge protector, characterized in that: The invention comprises a heating element (1) and a tripping assembly (4), wherein the tripping assembly (4) comprises a belt body (2) and a connecting assembly (3), wherein the connecting assembly (3) is located between a lightning protection element (7) and a grounding circuit, wherein the connecting assembly (3) is connected to the belt body (2) via a fuse, wherein the belt body (2) cooperates with the heating element (1), and the heating element (1) is used for generating heat when a power frequency current passes through the grounding circuit where the lightning protection element (7) is located, thereby melting the fuse.

2. The thermal release assembly according to claim 1, characterized in that: The heating element (1) is connected to the belt body (2), and the heating element (1) can drive the belt body (2) to separate from the connecting component (3) under the action of the elastic element (14).

3. The thermal release assembly according to claim 2, characterized in that: The connecting assembly (3) comprises a first connecting piece (8) connected to the lightning protection element (7) and a second connecting piece (9) connected to the grounding circuit, a connecting gap (12) being formed between the first connecting piece (8) and the second connecting piece (9), the belt body (2) having a contact end (11) and a connecting end (10) opposite to each other, the contact end (11) of the belt body (2) being located in the connecting gap (12) and being respectively connected to the first connecting piece (8) and the second connecting piece (9) via a fuse portion, the connecting end (10) of the belt body (2) being sleeved with the heating element (1), and the elastic element (14) being sleeved outside the heating element (1).

4. The thermal release assembly according to claim 2, characterized in that: The heating element (1) is connected to the power module via a first switch, and the first switch can be operated by an electrical signal of the grounding circuit cable.

5. The thermal release assembly according to claim 4, characterized in that: The first switch comprises a current transformer (5) and an electromagnetic trip switch (6); the current transformer (5) cooperates with the grounding circuit; the electromagnetic trip switch (6) is arranged on a circuit between the heating element (1) and the power module; the current transformer (5) is used to control the opening or closing of the electromagnetic trip switch (6) according to an electrical signal of the grounding circuit.

6. The thermal release assembly according to claim 4, characterized in that: A second switch is provided between the heating element (1) and the power module, the second switch being in conjunction with the heating element (1); when the connecting component (3) is connected to the heating element (1), the second switch is in a closed state; when the connecting component (3) is disconnected from the heating element (1), the second switch is in an open state.

7. The thermal release assembly according to claim 6, characterized in that: The second switch comprises a switch element arranged on the heating element (1) and a switch position arranged in series with the first switch, the switch element moves with the heating element (1) to control the opening or closing of the switch position.

8. The thermal release assembly according to claim 3, characterized in that: A second tube body (13) is disposed outside the heating element (1), the heating element (1) and the second tube body (13) are slidably matched, and an annular gap (15) for arranging the elastic element (14) is formed between the second tube body (13) and the heating element (1).

9. The thermal release assembly according to claim 7, characterized in that: The thermal release assembly further comprises a flip-up member, which cooperates with the heating element (1); when the connecting assembly (3) is connected to the heating element (1), the flip-up member is in a first state; when the connecting assembly (3) is disconnected from the heating element (1), the second switch is in a second state.

10. A surge protector, comprising a lightning protection element (7) arranged on a grounding circuit, characterized in that: The thermal release assembly according to any one of claims 1 to 9 and the lightning protection element (7) are connected in series to the grounding circuit.

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