TWM509971U - Melting type insulation fixing sheet and plug and socket using the melting type insulation fixing sheet - Google Patents

Description

Hot-melt insulating fixing piece and plug and socket using the same

The present invention relates to a hot-melt insulating fixing piece and a plug and a socket using the same. The hot-melt insulating fixing piece is a combined fixing component for contacting the two conductive members to each other to form a passage, and is broken during overheating, so that the two conductive members are opened due to an elastic force to form an open circuit. The present invention further uses the hot-melt insulating fixing piece for the overheat protection of the plug and the socket.

In order to avoid current overload, short circuit, overheating, etc. of the circuit, a fuse or a breaker is usually arranged on the circuit. When the temperature of the circuit is too high or the current is too large, the fuse is blown by the high temperature or the breaker is broken. The metal shrapnel jumps off to make the circuit open and power off, ensuring the safety of electricity.

Regarding the related structure of the fuse structure, for example, there is a "temperature fuse connection structure" of the Republic of China Invention Patent Publication No. I371053, which mainly includes two terminals connected to each other to form a passage, and a hot-melt metal is coupled to the two terminals. When the current is overloaded, the circuit is overheated, or the ambient temperature used is too high, the hot melt metal is heated and the temperature rises and melts and fractures, so that the two terminals are not connected to each other to form an open state.

However, the hot-melt metal of the previous case is a conductive material. When the hot-melt metal is melted, if the hot-melt metal portion is stuck to the two terminals, the residual hot-melt metal is also liable to cause false contact between the two terminals. Cannot completely power off. Or the hot melt metal that is blown and split may be bounced off by the two terminals that are opened to form an open circuit, and thus the object is accidentally contacted to cause a short circuit, and the use is still dangerous.

The applicant has proposed the Republic of China new patent No. M477079 "Overheat-damaged safety structure and socket and plug with overheat-damaged safety structure" on this issue. The case discloses the use of insulated limiting members to connect the two conductive members to form a passage. When the circuit is overheated, the insulating limiting member melts and fractures, so that the two conductive members are opened due to the elastic force to form an open circuit. The limiting member has a first insulating portion and a second insulating portion, and the first insulating portion and the second insulating portion are connected by a connecting portion to form a U-shaped appearance.

However, the actual use of the applicant has found that the U-shaped limiting member may be insufficient due to the joint rigidity, even if the passage between the two conductive members is not overheated, the U-shaped limiting member may be caused by the heat reduction and the restraining force is lowered. The elastic force between the two conductive members is bounced to form an open circuit between the two conductive members; or, when the temperature between the two conductive members reaches overheating, the first insulating portion and the second insulation of the U-shaped limiting member The portion is bounced by the elastic force between the two conductive members, but the connecting portion is still connected to the first insulating portion and the second insulating portion, so that the U-shaped limiting member maintains a partial restraining force, so that the two conductive members Maintain partial contact and not be able to completely power down. Both of the above conditions are possible misoperations.

In order to solve the problem that the above-mentioned limiting member may be mishandled, the present invention further proposes a hot-melt insulating fixing piece.

The hot-melt insulating fixing piece is configured to make the two conductive members contact each other to form a passage, and is broken during overheating, so that the two conductive members are opened to form an open circuit due to an elastic force, and the hot-melt insulating fixing piece comprises :

An insulated annular sleeve is disposed on the two conductive members, wherein the insulating annular sleeve has opposite second limiting portions and opposite two connecting portions connecting the two limiting portions, and the two limiting portions are connected to the two connecting portions The portion defines a accommodating space for accommodating the two conductive members to enable the two conductive members to contact each other; wherein at least one of the at least one of the two connecting portions has a thickness of 0.1 cm Between 1.2 cm.

Further, at least one portion of at least one of the two connecting portions has a thickness of 0.7 cm.

Further, the thickness of each of the limiting portions is not less than the thickness of any one of the two connecting portions.

Further, a middle portion of at least one of the two connecting portions forms a concave portion, and a thickness of the recess portion of at least one of the two connecting portions is between 0.1 cm and 1.2 cm.

Further, an end portion of at least one of the two limiting portions forms a diverging introduction portion.

Further, at least one of the outer sides of the two limiting portions forms a protruding pushing portion.

The present invention further proposes a plug using the aforementioned hot-melt insulating fixing piece, comprising:

An insulated body; a firewire pin disposed inside the insulating body and extending outside the insulating body; a neutral wire pin disposed inside the insulating body and extending outside the insulating body; , corresponding to the fire line pin; a neutral line, corresponding to the neutral line pin. The insulated loop kit is sleeved on the live pin and the live wire, so that the live pin and the live wire contact each other to form a passage, or/and sleeved on the neutral pin and the neutral line, so that the neutral The wire pins and the neutral wire are in contact with each other to form a passage, and the insulated ring sleeve is broken during overheating, such that a relationship between the live wire pin and the live wire or/and the neutral wire pin and the neutral wire The elastic force opens and forms an open circuit.

Further, the firewire pin extends in the same direction as the live wire; the neutral wire pin extends in the same direction as the neutral wire.

Further, the extending direction of the live pin is perpendicular to the extending direction of the live wire, and at least one of the live pin and the live wire has a bent extension piece, and the insulating annular sleeve is sleeved on the bent extension piece; the neutral line pin The extension direction is perpendicular to the extending direction of the neutral line, and at least one of the neutral line pin and the neutral line has a bent extension piece, and the insulated annular sleeve is sleeved on the bending extension piece.

The present invention further proposes a socket using the aforementioned hot-melt insulating fixing piece, comprising:

An insulative housing having at least one pair of opposite firewire jacks and a neutral jack; a livewire terminal disposed in the insulative housing and corresponding to the livewire jack; a neutral terminal disposed in In the insulating body, the neutral thread jack is disposed; a fire wire corresponds to the fire wire terminal; and a neutral wire corresponds to the neutral wire terminal. The insulated ring assembly is sleeved on the live wire terminal and the live wire, and the live wire terminal and the live wire are brought into contact with each other to form a passage, or/and the sleeve is placed on the neutral wire terminal and the neutral wire to make the neutral The wire terminal and the neutral wire are in contact with each other to form a passage, and the insulated ring sleeve is broken during overheating, such that a relationship between the live wire terminal and the live wire or/and between the neutral wire terminal and the neutral wire The elastic force opens and forms an open circuit.

The effect of this creation is:

1. The hot-melt insulating fixing piece of the present invention is made of an insulating material, so that the insulating property of the hot-melt insulating fixing piece is melted when the protected circuit is melted and destroyed due to overheating. It can avoid short circuit when accidentally accidentally touching the surrounding electronic components to ensure safety after power failure.

2. The above-mentioned insulated ring set is formed into a closed type by the connection of the two limiting portions and the two connecting portions, so that the combined rigidity is sufficient to combine and position the two conductive members of the circuit to be protected, and in normal use, it will not be The elastic force between the conductive members bounces to cause a malfunction.

3. The thickness of the two limiting portions of the aforementioned insulative ring set is not less than the thickness of either of the two connecting portions, ensuring sufficient bonding rigidity.

4. The insulating ring set is an annular closed form. When heated and melted, it can ensure that the two limiting parts are completely bounced off by the elastic force of the two conductive parts, so that the two conductive parts are separated and opened and the power is turned off, unlike the previous one. The U-shaped limiting member described in the technology is open at one end, and when the end is bounced by the two conductive members, the other end still maintains a partial restraining force, so that the two conductive members may still be restrained and the power is incomplete.

5. At least one of the at least one of the two connecting portions of the insulative annular kit has a thickness of between 0.1 cm and 1.2 cm, preferably 0.7 cm. Therefore, when the protected circuit is heated up to about 130 ° C to about 140 ° C, the degree of heat fusion of the insulated ring set can ensure that the two conductive members are elastically bounced off, ensuring that the protected circuit is indeed powered off.

6. The end of at least one of the two limiting portions of the insulative annular kit forms a diverging lead-in portion for easy fitting of the insulated annular sleeve over the two conductive members.

7. The outer side of at least one of the two limiting portions of the insulative annular kit forms a convex pushing portion, which is easy for the user to apply force on the pushing portion with a tool such as a needle-nose pliers, and the insulating annular sleeve is placed on the On the two conductive parts.

In combination with the above technical features, the main effects of the present hot-melt insulating fixing sheet and the plug and socket using the same are shown in the following embodiments.

The first embodiment of the present invention is shown in the first figure. The insulating fixing piece of this embodiment includes:

An insulated ring set (1) has opposite second limiting portions (11) and opposite two connecting portions (12) connected to the two limiting portions (11), and the two limiting portions (11) are connected to the two The portion (12) collectively defines an accommodating space (13); wherein the thickness of the two connecting portions (12) is between 0.1 cm and 1.2 cm, and in this embodiment, 0.7 cm, and each limiting portion (11) The thickness of the ) is not less than the thickness of either of the two connecting portions (12).

Referring to Figures 2 through 5, the insulated ring set (1) is placed over the two conductive members (2) of the circuit to be protected. Wherein the two conductive members (2) are separated and not in contact in an initial state, the two conductive members (2) are first brought into close contact with each other by an external force (F), and the insulated ring set (1) is placed over On the two conductive members (2), when the insulating annular sleeve (1) is sleeved on the two conductive members (2) to accommodate the two conductive members (2) in the accommodating space (13), the two The limiting portion (11) respectively abuts the two conductive members (2), thereby compressing the two conductive members (2) to store an elastic force, and the two conductive members (2) can contact each other to form a path. .

Referring to the sixth figure, the present invention is formed by the connection of the second limiting portion (11) and the two connecting portions (12) to form a closed state, and thus has sufficient bonding rigidity to shield the two conductive members of the circuit to be protected ( 2) combined positioning, in the normal use state, the insulated ring set (1) will not be bounced by the elastic force between the two conductive members (2), and the second limit portion (11) The thickness of not less than either of the two connecting portions (12) is also ensured to provide sufficient bonding rigidity.

Referring to the seventh and eighth figures, when the protection circuit is overloaded due to current or voltage, the two conductive members (2) are heated and overheated, for example, when the temperature is raised to about 130 ° C or 140 ° C, the insulation. The ring set (1) is softened by heat and melted, and its restraining force is lowered. At this time, the elastic force between the two conductive members (2) is released, so that the two conductive members (2) are opened to form an open circuit to avoid overheating. Risk of fire, etc. Wherein, the thickness of the two connecting portions (12) is between 0.1 cm and 1.2 cm to ensure that the elastic force between the two conductive members (2) is sufficient to overcome the restraint when the connecting portion (12) is softened by heat. Force it to bounce it off. Moreover, the insulating ring set (1) is in an annular closed form, and the connecting portion (12) is connected to both ends of the two limiting portions (11), so that the second limiting portion (11) can be ensured when heated and melted. Both ends are evenly bounced by the elastic force of the two conductive members (2), so that the two conductive members (2) can be separated and opened and powered off.

Referring again to the ninth and tenth drawings, since the insulating ring set (1) is made of an insulating material, even if the insulating ring set (1) is broken due to melting and is randomly bounced, the insulation The insulating nature of the ring kit (1) prevents accidental misuse of surrounding electronic components and short circuits to ensure safety after power failure.

The second embodiment of the present invention is shown in the eleventh and twelfth drawings. The insulating fixing piece of this embodiment includes:

An insulated ring set (1A) having opposite second limiting portions (11A) and opposite two connecting portions (12A) connected to the two limiting portions (11A), the two limiting portions (11A) being connected to the two The portion (12A) collectively defines an accommodation space (13A); wherein the thickness of the two connection portions (12A) is between 0.1 cm and 1.2 cm, which is 0.7 cm in this embodiment, and each limit portion (11A) The thickness of the ) is not less than the thickness of either of the two connecting portions (12A). The difference from the first embodiment is that the end of at least one of the two limiting portions (11A) forms a diverging introduction portion (14A). The introduction portion (14A) functions to allow the user to easily introduce the two conductive members (2) into the accommodating space (13A) of the insulated annular set (1A).

The third embodiment of the present invention is shown in the thirteenth and fourteenth embodiments. The insulating fixing piece of this embodiment includes:

An insulated ring set (1B) having opposite second limiting portions (11B) and opposite two connecting portions (12B) connected to the two limiting portions (11B), the two limiting portions (11B) being connected to the two The portion (12B) collectively defines an accommodation space (13B); wherein the thickness of the two connection portions (12B) is between 0.1 cm and 1.2 cm, which is 0.7 cm in this embodiment, and each limit portion (11B) The thickness of the ) is not less than the thickness of either of the two connecting portions (12B). The difference from the first embodiment is that the outer side of at least one of the two limiting portions (11B) forms a protruding pushing portion (14B). The function of the pushing portion (14B) is that the user can easily apply a force on the pushing portion (14B) by a tool such as a needle-nosed pliers, and the insulating ring set (1B) is placed on the two conductive members (2). on.

The fourth embodiment of the present invention is shown in the fifteenth figure. The insulating fixing piece of this embodiment includes:

An insulated ring set (1C) having opposite second limiting portions (11C) and opposite two connecting portions (12C) connected to the two limiting portions (11C), the two limiting portions (11C) being connected to the two The portion (12C) collectively defines an accommodation space (13C); wherein the thickness of the two connection portions (12C) is between 0.1 cm and 1.2 cm, which is 0.7 cm in this embodiment, and each limit portion (11C) The thickness of the ) is not less than the thickness of either of the two connecting portions (12C). In this embodiment, the middle portion of the two connecting portions (12C) forms a concave portion (14C), the recess portion (14C) faces the other connecting portion (12C), and the two connecting portions (12C) are The thickness at the location of the recess (14C) is between 0.1 cm and 1.2 cm. In this embodiment, the shape of the two connecting portions (12C) can be arbitrarily changed, and the effect of the present invention can be achieved as long as a part of the thickness is between 0.1 cm and 1.2 cm.

As shown in the sixteenth embodiment, the hot-melt insulating fixing piece of the present invention is used for the overheat protection of the plug. Taking the hot-melt insulating fixing piece of the first embodiment as an example, the embodiment includes:

An insulating body (3); a firewire pin (4) disposed inside the insulating body (3) and extending outside the insulating body (3); a neutral wire pin (5) disposed on the insulating body (3) inside, and extending outside the insulating body (3); a fire wire (6) corresponding to the fire wire pin (4); a neutral wire (7) corresponding to the neutral wire pin (5), wherein The firewire pin (4) extends in the same direction as the live wire (6), and the neutral wire pin (5) extends in the same direction as the neutral wire (7).

The insulated loop kit (1) is sleeved on the live pin (4) and the live wire (6), so that the live pin (4) and the live wire (6) are in contact with each other to form a passage, or/and The neutral wire pin (5) and the neutral wire (7) make the neutral wire pin (5) and the neutral wire (7) contact each other to form a passage, and the insulated ring set (1) is Melting when overheated, causing an open circuit between the live wire pin (4) and the live wire (6) or/and the neutral wire pin (5) and the neutral wire (7) due to an elastic force. To achieve the effect of overheat protection.

Referring to Figures 17 and 18, the hot-melt insulating fixing piece can be applied to another type of plug in addition to the plug of the above type, and the plug of the other type includes :

An insulating body (3A); a fire wire pin (4A) disposed inside the insulating body (3A) and extending outside the insulating body (3A); a neutral wire pin (5A) disposed on the insulating body (3A) internal and extending outside the insulating body (3A); a fire wire (6A) corresponding to the live wire pin (4A); a neutral wire (7A) corresponding to the neutral wire pin (5A). Wherein, the extending direction of the live pin (4A) is perpendicular to the extending direction of the live wire (6A), and the live wire (6A) has a bent extending piece (61A), and the insulating annular set (1) is sleeved on the bending On the extension piece (61) and the live wire pin (4A), the extending direction of the neutral wire pin (5A) is perpendicular to the extending direction of the neutral wire (7A), and the neutral wire (7A) has a bending extension. A piece (71A) is disposed on the bent extension piece (71) and the neutral wire pin (5A). That is, either the live pin (4A) and the live wire (6A) or the neutral pin (5A) and the neutral wire (7A) may be bent into a suitable form to match the insulated ring set ( 1).

Referring to the 19th and 20th drawings, the hot-melt insulating fixing piece of the present invention is used for the overheat protection of the socket. Taking the hot-melt insulating fixing piece of the first embodiment as an example, the embodiment includes:

An insulative housing (8) having at least one pair of opposing firewire jacks (81) and a neutral jack (82); a livewire terminal (9) mounted in the insulative housing (8), and Corresponding to the fire wire jack (81); a neutral wire terminal (10) is installed in the insulating body (8), and corresponds to the neutral wire jack (82); a fire wire (20), corresponding to the fire wire Terminal (9); a neutral line (30), corresponding to the neutral terminal (10).

The insulated ring set (1) is sleeved on the live wire terminal (9) and the live wire (20), so that the live wire terminal (9) and the live wire (20) are in contact with each other to form a passage, or/and a sleeve The neutral line terminal (10) and the neutral line (30) are arranged such that the neutral line terminal (10) and the neutral line (30) are in contact with each other to form a passage. The insulated ring set (1) is Melting when overheating, opening between the live wire terminal (9) and the live wire (20), or/and between the neutral wire terminal (10) and the neutral wire (30) due to an elastic force to form an open circuit , to achieve the effect of overheat protection.

In view of the above description of the embodiments, the above-described embodiments are merely a preferred embodiment of the present invention, and the implementation of the present invention is not limited thereto. The scope, that is, the simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the creation of the creation, are within the scope of this creation.

(1)‧‧‧Insulated ring kit
(11) ‧ ‧ Limitation Department

(12) ‧‧‧Connecting Department
(13) ‧‧‧ accommodating space

(2) ‧‧‧Electrical parts

(F) ‧ ‧ external forces

(1A)‧‧‧Insulated ring kit
(11A) ‧ ‧ Limitation Department

(12A) ‧ ‧ Connections
(13A) ‧‧‧ accommodating space

(14A)‧‧‧Importing Department

(1B)‧‧‧Insulated ring kit
(11B) ‧ ‧ Limitation Department

(12B)‧‧‧Connecting Department
(13B) ‧‧‧ accommodating space

(14B) ‧‧‧Pushing Department

(1C)‧‧‧Insulated ring kit
(11C) ‧ ‧ Limitation Department

(12C) ‧ ‧ Connections
(13C) ‧‧‧ accommodating space

(14C) ‧ ‧ recess

(3)‧‧‧Insulated body

(4) ‧‧‧Firewire pins

(5) ‧‧‧Neutral pin

(6) ‧ ‧ FireWire

(7) ‧‧‧Neutral

(3A)‧‧‧Insulated body

(4A)‧‧‧Firewire pins

(5A) ‧‧‧Neutral pin

(6A) ‧‧‧FireWire
(61A)‧‧‧Bend extension

(7A) ‧‧‧Neutral

(8)‧‧‧Insulated body
(81)‧‧‧Firewire jack

(82)‧‧‧Neutral jack

(9)‧‧‧Firewire terminals

(10)‧‧‧Neutral terminal

(20) ‧‧‧FireWire

(30) ‧‧‧Neutral

[First figure] is a perspective external view of the insulated ring set in the first embodiment of the creation.

[Second figure] is an exploded perspective view of the second conductive member in the first embodiment of the present invention.

[Third image] is a schematic view showing the operation of the insulated annular kit on the two conductive members in the first embodiment of the present invention.

[Fourth figure] is a three-dimensional combination diagram in which the insulating annular kit is placed on the two conductive members in the first embodiment of the present invention.

[Fifth figure] is a three-dimensional combination view in which the insulating annular kit is placed on the other side of the two conductive members in the first embodiment of the present invention.

[Sixth drawing] is a schematic view of the first embodiment in which the insulating annular sleeve is sleeved on the two conductive members to bring the two conductive members into contact with the limit.

[Seventh] is a front view in which the two conductive members are stretched by the elastic force when the protected circuit is melted and the restraining force is lowered due to overheating in the first embodiment of the present invention.

[Eighth image] is a three-dimensional external view in which the two conductive members are stretched by the elastic force when the protected circuit is melted and the restraining force is lowered due to overheating in the first embodiment of the present invention.

[9th] is a front view in which the two conductive members are stretched by the elastic force when the protected circuit is melted and broken due to overheating in the first embodiment of the present invention.

[Tenth Graph] is a three-dimensional appearance in which the two conductive members are stretched by the elastic force when the protected circuit is melted and broken due to overheating in the first embodiment of the present invention.

[11th] is a schematic view of the second embodiment in which the insulating ring set is provided with an introduction portion for easy fitting on the two conductive members.

[Twelfth Figure] In the second embodiment of the present invention, the insulating ring set is provided with an introduction portion for facilitating the cross-sectional view of the two conductive members.

[Thirteenth Figure] is a schematic view showing a protruding push-out portion provided on the insulating ring set in the third embodiment of the present creation.

[Fourteenth] is a schematic view of the third embodiment in which the tool is placed against the pushing portion to facilitate the sleeve of the insulating annular sleeve on the two conductive members.

[Fifteenth Figure] is a schematic view of the fourth embodiment in which the connection portion has a concave portion.

[16th] is a schematic view of the plug of the present invention, in which the hot-wire insulating pin extends in the same direction as the live wire, and the neutral pin and the neutral wire extend in the same direction.

[Fig. 17] is a schematic view of the plug of the present invention, in which the hot-wire type insulating fixing piece is used for the plug, wherein the live wire pin and the fire line are perpendicular to each other, and the neutral line pin and the neutral line are perpendicular to each other.

[Embodiment 18] is a partial schematic view of a hot-melt insulating fixing piece for a plug, wherein the live wire pin and the fire line are perpendicular to each other, and the neutral line pin and the neutral line are perpendicular to each other.

[19th] is one of the schematic diagrams of the hot-melt insulating fixing piece for the socket.

[20th] is the second schematic diagram of the hot-melt insulating fixing piece used for the socket.

(1)‧‧‧Insulated ring kit

(11) ‧ ‧ Limitation Department

(12) ‧‧‧Connecting Department

(13) ‧‧‧ accommodating space

(2) ‧‧‧Electrical parts

Claims (10)

A hot-melt insulating fixing piece for contacting two conductive members to each other to form a passage, and being broken during overheating, so that the two conductive members are opened by an elastic force to form an open circuit, and the hot-melt insulating fixing piece The utility model comprises: an insulated annular sleeve sleeved on the two conductive members, wherein the insulating annular sleeve has opposite second limiting portions and opposite two connecting portions connecting the two limiting portions, and the two limiting portions and the The two connecting portions jointly define an accommodating space for accommodating the two conductive members, so that the two conductive members can be in contact with each other; wherein the thickness of at least one of the at least one of the two connecting portions is between Between 0.1 cm and 1.2 cm. The hot-melt insulating fixing sheet according to claim 1, wherein at least one of the at least one of the two connecting portions has a thickness of 0.7 cm. The hot-melt insulating fixing sheet according to claim 1, wherein the thickness of each of the limiting portions is not less than the thickness of any one of the two connecting portions. The hot-melt insulating fixing sheet according to claim 1, wherein a middle portion of at least one of the two connecting portions forms a concave portion, and a thickness of the concave portion at least one of the two connecting portions is Between 0.1 cm and 1.2 cm. The hot-melt insulating fixing sheet according to claim 1, wherein an end portion of at least one of the two limiting portions forms a diverging one-introducing portion. The hot-melt insulating fixing sheet according to claim 1, wherein an outer side of at least one of the two limiting portions forms a protruding pushing portion. A plug for a hot-melt insulating fixing sheet according to any one of claims 1 to 6, comprising: an insulating body; a firewire pin disposed inside the insulating body and extending over a neutral wire pin disposed inside the insulating body and extending outside the insulating body; a fire wire corresponding to the fire wire pin; a neutral wire corresponding to the neutral wire pin; The insulated annular sleeve is sleeved on the live wire pin and the fire wire, so that the fire wire pin and the fire wire contact each other to form a passage, or/and sleeved on the neutral wire pin and the neutral wire, so that the neutral wire pin Forming a path with the neutral wires contacting each other, the insulated ring set being broken during overheating, causing an elastic force between the live wire pin and the live wire or/and between the neutral wire pin and the neutral wire And open to form an open circuit. The plug of claim 7, wherein the live pin extends in the same direction as the live wire; the neutral pin extends in the same direction as the neutral. The plug of claim 7, wherein the live pin extends in a direction perpendicular to the direction in which the live wire extends, and at least one of the live pin and the live wire has a bent extension piece, the insulated annular sleeve On the bent extension piece; the extension direction of the neutral line pin is perpendicular to the extending direction of the neutral line, and at least one of the neutral line pin and the neutral line has a bent extension piece, the insulated ring set Nested on the bent extension piece. A socket for using the hot-melt insulating fixing sheet according to any one of claims 1 to 6, comprising: an insulative body having at least one pair of opposing firewire jacks and a neutral plug a fire wire terminal, installed in the insulating body, and corresponding to the fire wire jack; a neutral wire terminal, installed in the insulating body, and the neutral wire jack; a fire wire, corresponding to the fire wire a neutral line corresponding to the neutral terminal; the insulating ring assembly is sleeved on the live wire terminal and the live wire, and the live wire terminal and the live wire are in contact with each other to form a passage, or/and a sleeve a neutral line terminal and the neutral line, the neutral line terminal and the neutral line are in contact with each other to form a passage, and the insulated ring set is broken during overheating, so that the live line terminal and the line are between/and/or The neutral wire terminal and the neutral wire are opened by an elastic force to form an open circuit.