WO2025013976A1 - Thermal fuse for high voltage direct current - Google Patents

Abstract

This thermal fuse for high voltage direct currents comprises a small contact point forming member disposed between a contact part of a fixed terminal and a contact part of a movable terminal and having a plurality of small contact points formed on a contact portion of a contact part facing a contact part of a terminal requiring contact point formation, wherein the small contact point forming member is configured to, when the movable terminal enters in the direction of the fixed terminal, make divided contact with the contact portion of the facing terminal through the small contact points formed at the contact portion of the contact part, and conduct currents between the contact part of the fixed terminal and the contact part of the movable terminal through the small contact points in divided contact, and to, when the movable terminal moves in the opposite direction of the fixed terminal, make the contact part of the fixed terminal and the contact part of the movable terminal disconnected through individual disconnection of the small contact points in contact with the contact part.

Description

Thermal fuse for high voltage DC current

The present invention relates to a high-voltage direct current thermal fuse, and more specifically, to a high-voltage direct current thermal fuse that is placed on a circuit to which high-voltage direct current is applied and short-circuits the circuit when the peripheral part is abnormally overheated, thereby preventing damage to the circuit caused by high-voltage direct current.

As you may know, thermal fuses, also known as thermal links, are usually installed in electronic devices that tend to generate heat.

When the above device malfunctions, generates heat, or exceeds an abnormal temperature, the thermal fuse automatically melts and cuts off the power supply to protect the electronic device from fire.

Recently, the above-mentioned temperature fuse is installed in most home appliances whose main function is heating, such as electric rice cookers, electric irons, and electric heaters.

When the internal parts are not working, the power supply can be cut off in time by the thermal fuse to prevent further damage to the device, thereby avoiding becoming a source of fire. The thermal fuse is the same as the well-known fuse.

It is usually just a power supply path within the circuit. It has no effect on the circuit as long as the current does not exceed its rated value.

It has low resistance, small power loss and low surface temperature in normal operation. It only cuts off the power supply circuit when the electronic device malfunctions and generates abnormal temperature.

The above thermal fuse serves as overheat protection within the power supply circuit when the temperature range reaches the melting temperature of the fusible alloy wire inside the thermal fuse at the thermal fuse location.

By the melting agent, the fusible alloy wire shrinks towards the leads at both ends, preventing other components of the circuit from being further damaged by abnormal temperatures.

Therefore, the above temperature fuse is applied to many circuits requiring overheating protection. Different circuits have different temperature fuses.

Recently, electric and electronic devices that apply high-voltage direct current, such as electric vehicles, are rapidly becoming widespread, and since these devices are configured to operate various electric and electronic components, such as heaters, through high-voltage direct current, the role of thermal fuses in electrical safety is very important.

For example, if a high voltage direct current is continuously applied to the electrical or electronic component while overheating occurs in the surrounding area, electrical damage to the electrical or electronic component may occur, and if the damage worsens, a safety accident such as a fire may occur.

However, in the case of a conventional thermal fuse having a fusible alloy wire placed between a simply spaced input lead and a first lead, when AC current or a low-voltage DC current is passed through it, the fusible alloy wire formed between the spaced fixed terminals is short-circuited due to overheating of the peripheral portion, so that the corresponding current passing through the fusible alloy wire is no longer applied to the circuit, thereby ensuring the electrical safety of the circuit when the peripheral portion is abnormally overheated.

However, in the case of the high-voltage direct current of 100 V or more, the phenomenon of short circuit occurs when the fusible alloy wire formed between the fixed terminals explodes due to overheating of the surrounding area, generating flames or fragments.

In particular, even after the available alloy wire melts and becomes short-circuited, a phenomenon occurs in which a high-voltage direct current of 100 V or more is discharged in the form of an arc between the short-circuited lead terminals and conducts current.

That is, in a DC circuit having a voltage level of 100 V or higher, during the melting process of the available alloy wire of a conventional thermal fuse, the shrinkage speed of the melted alloy wire is slow, the gap between the two leads is very short, and an arc is generated, resulting in the inability to cut off the circuit in time. The circuit can be eliminated due to the occurrence of an arc along with high-temperature combustion.

Therefore, existing thermal fuses used in DC circuits with voltage levels of 100 V or higher not only fail to trip the protection circuit in time, but also cause unnecessary problems.

In addition, it was confirmed that electrical damage to not only the fuse itself but also the circuit and electronic/electrical components was continuously caused by the high-voltage direct current that passed between the above-mentioned short-circuited fixed terminals in the form of an arc discharge.

Accordingly, there is an urgent need in the field of this invention to develop and distribute a new type of thermal fuse that can safely shield not only low voltage but also high voltage direct current by heating the surrounding area.

The purpose of the present invention, which was devised to solve the above-mentioned problem, is to secure sufficient current-carrying area between the fixed terminal and the movable terminal by configuring the fixed terminal and the movable terminal to conduct current through small contact points with narrow contact areas, and

In particular, the present invention provides a high-voltage direct current thermal fuse that suppresses flame explosions caused by large-scale arc discharges by minimizing the occurrence of large-scale arcs that occur in the short-circuiting process of a contact point due to abnormal overheating of the peripheral area, and prevents the phenomenon in which high-voltage direct current flows between a short-circuited fixed terminal and a movable terminal in the form of an arc discharge.

The above-mentioned object is achieved by the following configuration provided in the present invention.

A high voltage direct current temperature fuse according to the present invention is

A fixed terminal that is connected to the first lead and has a contact portion formed;

A movable terminal that is connected to the first lead and is energized, enters in the direction of the fixed terminal in normal times, and exits in the opposite direction of the fixed terminal when the surrounding area is abnormally heated, and has a contact portion formed; and

It is configured to include a contact point forming member having a plurality of contact points formed in a contact portion facing the contact portion of the terminal requiring contact formation, and is arranged between the contact portion of the fixed terminal and the contact portion of the movable terminal.

The above-mentioned small contact forming member, when the movable terminal enters in the direction of the fixed terminal, makes a divided contact with the contact part of the facing terminal through the small contact points formed in the contact part of the contact part, and conducts current between the contact part of the fixed terminal and the contact part of the movable terminal through the dividedly-contacted small contact points.

It is characterized in that when the above movable terminal is moved in the opposite direction of the fixed terminal, the contact portion of the fixed terminal and the contact portion of the movable terminal are disconnected through individual disconnection of the small contacts that come into contact with the contact portion.

As a specific example,

The present invention is characterized by comprising: a conductive case made of a cylindrical body made of a conductive material, connected to an output terminal, and having an open receiving space on one side; a fixed terminal installed in an insulated state from the conductive case through an insulating bush on one side of the conductive case and connected to an input lead; a fusible supporter installed on the other side of the receiving space of the conductive case and melting when overheated; a movable terminal installed in a forward-retreating structure in a space formed between the insulating bushing and the fusible supporter when the conductive case is in an energized state, and entering toward the fixed terminal when supported by the fusible supporter, and exiting in the opposite direction of the fixed terminal when the support by the fusible supporter is canceled out; and a contact point forming member disposed between a contact portion of the fixed terminal and a contact portion of the movable terminal, and having a plurality of small contact points formed of a contacting wire formed on a contact portion of the contact portion facing the contact portion of a terminal requiring contact formation.

Preferably, the contact forming member is formed of an insulating body having a length longer than the set discharge shielding distance, and has an insulating core formed with a contact portion facing the contact portion of the terminal requiring contact formation;

It is configured to include a plurality of contact wires, each of which is arranged on the insulating core and forms a plurality of small contact points that contact the contact portion of the terminal that requires contact formation at the contact portion.

As described above, in the melting type thermal fuse according to the present invention, in normal times, the contact portion of the fixed terminal and the contact portion of the movable terminal are electrically connected through small contact points formed by a small contact forming member, thereby securing sufficient electrical conducting capacity.

In addition, when the fixed terminal and the movable terminal are disconnected, the small contact points formed in the contact portion of the small contact forming member are individually disconnected, thereby preventing the occurrence of a large-scale arc discharge. As a result, the reliability of disconnection is lowered due to the occurrence of a large-scale arc discharge in the past, and the occurrence of a secondary safety accident due to an explosion is prevented.

Figure 1 schematically shows the overall structure of a high-voltage direct current temperature fuse according to the present invention.

Figures 2 and 3 show the overall configuration of a cylindrical temperature fuse proposed as an example in the present invention.

Figures 4 and 5 show the detailed configuration of the contact forming member in the high-voltage direct current temperature fuse proposed as a preferred embodiment of the present invention.

Figures 6 and 7 are operational state diagrams showing the current-carrying state and short-circuiting state of a high-voltage direct current through a high-voltage direct current thermal fuse proposed as a preferred embodiment of the present invention.

Hereinafter, a high-voltage direct current thermal fuse proposed as a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a schematic diagram showing the entire structure of a high-voltage direct current temperature fuse according to the present invention, FIGS. 2 and 3 show the entire configuration of a cylindrical temperature fuse proposed as an embodiment of the present invention, FIGS. 4 and 5 show the detailed configuration of a contact forming member in a high-voltage direct current temperature fuse proposed as a preferred embodiment of the present invention, and FIGS. 6 and 7 are operational state diagrams showing the current-conducting state and the disconnection state of a high-voltage direct current through a high-voltage direct current temperature fuse proposed as a preferred embodiment of the present invention, respectively.

The temperature fuse (1) proposed as a preferred embodiment in the present invention comprises, as shown in Fig. 1, a fixed terminal (20) connected to a first lead (L1); and a movable terminal (40) connected to a second lead (L2), which normally enters the direction of the fixed terminal (20) and is electrically connected to the fixed terminal (20), but when the peripheral area is abnormally heated, enters in the opposite direction of the fixed terminal (20) and is disconnected from the fixed terminal (20), thereby protecting the circuit from abnormal heat generation by disconnecting the energized fixed terminal (20) and the movable terminal (40) due to external heat caused by abnormal heat generation of the device.

In this specification, as shown in FIGS. 2 to 3 and FIGS. 6 to 7, a cylindrical thermal fuse (1) is provided in a cylindrical current-carrying case (10) with a fixed terminal (20), a movable terminal (40), and a movable support (70) that switches the support state of the movable terminal (40) according to abnormal heating, so that the movable terminal (40) enters the direction of the fixed terminal (20) or exits in the opposite direction of the fixed terminal (20) depending on whether the movable support (70) melts due to abnormal heating, thereby changing the current-carrying state between the fixed terminal (20) and the movable terminal (40). The technical idea proposed in the present invention is not limited to the cylindrical thermal fuse.

A cylindrical thermal fuse (1) proposed as an embodiment of the present invention comprises a cylindrical body made of a conductive material to which a second lead (L2) is connected, a current-carrying case (10) having an open receiving space (10a) on one side; a soluble support (70) installed on the other side of the receiving space (10a) of the current-carrying case (10) and melted when heated abnormally; a fixed terminal (20) installed on one side of the current-carrying case (10) in an insulated state from the current-carrying case (10) through an insulating bush (30) and connected to a first lead (L1); And it includes a movable terminal (40) that forms a contact state of the above-mentioned current case (10) and is installed in a forward-reverse structure between the fixed terminal (20) and the available support (70), so that when entering in the direction of the fixed terminal (20), it conducts current between the current case (10) and the fixed terminal (20), and when exiting in the opposite direction of the fixed terminal (20), it disconnects the current between the current case (10) and the fixed terminal (20).

Preferably, a first spring (50) is installed between the insulating bush (30) and the movable terminal (40) to force the movable terminal (40) in the opposite direction to the fixed terminal (20), and a second spring (60) is installed between the available support (70) and the movable terminal (40) to force the movable terminal (40) in the direction of the fixed terminal (20).

At this time, the elastic force of the first spring (50) is configured to be smaller than the elastic force of the second spring (60), so that when the available support (70) is in a solid state, the first spring (50) is compressed by the elastic force of the second spring (60), so that the movable terminal (40) enters toward the fixed terminal (20).

And, when the available support (70) is melted due to abnormal heating of the device, etc., the elastic force of the second spring (60) is canceled out, so the first spring (50) extends and the movable terminal (40) advances in the opposite direction of the fixed terminal (20).

Meanwhile, the high-voltage direct current that flows between the fixed terminal (20) and the movable terminal (40) of the above-mentioned temperature fuse (1) causes an arc discharge phenomenon in the process of disconnection of the fixed terminal (20) and the movable terminal (40), and the arc discharge phenomenon has the characteristic of increasing as the contact area (contact area) between the fixed terminal (20) and the movable terminal (40) increases.

However, the fixed terminal (20) and the movable terminal (40) must have sufficient contact area to allow passage of the required high-voltage direct current. However, due to an increase in the contact area, a large-scale arc discharge occurs when the fixed terminal (20) and the movable terminal (40) are disconnected due to overcurrent.

That is, when the contact area between the fixed terminal (20) and the movable terminal (40) decreases, the arc discharge decreases, ensuring reliability and safety from disconnection, but reducing the high-voltage direct current capacity that can be transmitted.

On the other hand, when high-voltage direct current is passed by contacting contact parts with a large contact area to secure sufficient current-carrying area, a large-scale arc discharge occurs due to the large current-carrying area during the short-circuiting process.

In this way, if a large-scale arc discharge occurs due to a large contact area when the fixed terminal (20) and the movable terminal (40) are disconnected, the disconnection of the fixed terminal (20) and the movable terminal (40) may be delayed or the fixed terminal (20) and the movable terminal (40) may become fixed, causing an overcurrent consisting of a continuous high-voltage direct current to flow between the fixed terminal (20) and the movable terminal (40), and in particular, a secondary safety accident such as a fire may occur due to debris or flames flying to the surrounding area by an explosion caused by a large-scale arc discharge.

In order to solve this problem, in the present invention, instead of conducting current by directly contacting the contact portion (21) of the fixed terminal (20) and the contact portion (41) of the movable terminal (40), a contact point forming member (80) in which a plurality of small contact points (P) having a narrow contact area are formed is arranged between the contact portion (21) of the fixed terminal (20) and the contact portion (41) of the movable terminal (40), as shown in FIGS. 1 to 3.

Accordingly, the contact portion (21) of the fixed terminal (20) and the contact portion (41) of the movable terminal (40) do not conduct current through a single contact portion with a large current-conducting area, but conduct current through narrow contact points (P) with divided current-conducting areas to the contact portions (21, 41), thereby securing sufficient contact area required for conducting the required high-voltage direct current, while preventing the occurrence of a large-scale arc discharge through individual disconnection of the small contact points (P) with narrow contact areas in the event of a disconnection.

The above-mentioned small contact forming member (80), as shown in FIGS. 2 to 7, is arranged between the fixed terminal (20) and the movable terminal (40) to form a plurality of small contact points (P) with a narrow contact area with the contact portions (21, 41) of the terminals (20, 40) facing each other, so that the small contact points (P) contact the contact portions (21, 41) of the terminals (20, 40) requiring contact formation, thereby allowing the fixed terminal (20) and the movable terminal (40) to conduct current through the plurality of small contact points (P).

Preferably, the contact forming member (80) is formed of an insulating body having a length longer than the set discharge shielding distance, and includes an insulating core (81) in which a contact portion contact portion is formed; and a plurality of contact wires (82) which are respectively arranged on the insulating core (81) and form a contact portion (P) that is dividedly contacted at each contact portion of the contact portion (21, 41) of the terminal (20, 40) facing the contact portion (21, 41) of the terminal (20, 40) requiring contact formation.

Here, the insulating core (81) is composed of an insulating body made of any one of ceramic material, synthetic resin material, quartz, or glass.

In the first embodiment of the present invention, as shown in Fig. 4, a plurality of partition alignment paths (81a) shielded by partition shielding pieces (81a-a) are formed on the outer surface of the insulating core (81), and contact wires (82) are arranged lengthwise in the partition alignment paths (81a) to form a plurality of small contact points (P) protrudingly in the contact portions (S1, S2) formed on both sides of the insulating core (81).

And, in the second embodiment of the present invention, as shown in Fig. 5, longitudinally penetrating segment alignment paths (81a) are formed in the insulating core (81), and contact wires (82) are arranged to penetrate each segment alignment path (81a), thereby forming a plurality of small contact points (P) protrudingly in the contact portions formed on both sides of the insulating core (81).

In addition, in this embodiment, an end introduction groove (81c) is formed to guide the ends of the contact wires (82) into the contact portions (S1, S2) of the insulating core (81), so that the ends of the contact wires (82) aligned in each section alignment path (81a, 81b) are aligned by being introduced into the end introduction groove (81c).

Preferably, the contact wires (82) arranged on the insulating core (81) to form the small contact points (P) at the contact portions (S1, S2) are made of a current-carrying wire having a thickness of 0.01 mm to 1 mm or less, and the set discharge shielding distance (L) formed by the small contact forming member (80) is preferably 1 mm to 20 mm or less, as shown in FIGS. 1 and 5.

For example, if the set discharge shielding distance (L) is formed shorter than the standard value, an arc discharge occurs between the contact portion (21) of the fixed terminal (20) and the contact portion (41) of the movable terminal (40) during the short-circuiting process, making it difficult to prevent a large-scale arc from occurring during the short-circuiting process.

In addition, the above-mentioned small contact forming member (80) may be installed or formed in a state in which it is energized in the contact portion (21) of the fixed terminal (20) and is dividedly energized with the contact portion (41) of the movable terminal (40) through a plurality of small contact points (P) formed in the contact portion contact portion (S2), or may be formed in a state in which it is energized in the contact portion (41) of the movable terminal (40) and is dividedly energized with the contact portion (21) of the fixed terminal (20) through a plurality of small contact points (P) formed in the contact portion contact portion (S1), and all of these are intended to be within the scope of the present invention.

However, in this embodiment, a plurality of small contact points (P) each made up of contact wires (82) are formed at each of the contact points (S1, S2) formed on both sides of the insulating core (81), so that the contact point (21) of the fixed terminal (20) and the contact point (41) of the movable terminal (40) form contact points through the small contact points (P) by the small contact forming member (80).

For example, one side of a contact point forming member (80) in which contact points (P) are formed on each side of the insulating core (81) is placed in close contact with the contact portion (41) of the movable terminal (40), and the contact point forming member (80) and the insulating bush (30) are elastically supported by the first spring (50), so that the contact points (P) formed on one side of the insulating core (81) are fixed to the contact portion (41) of the movable terminal (40) by the elastic force provided by the first spring (50), thereby ensuring that current is always transmitted to the movable terminal (40).

And, as seen in Fig. 6, the small contact points (P) formed on the back side of the insulating core (81) facing the contact portion (21) of the fixed terminal (20) form a split contact state through the contact portion (21) of the fixed terminal (20) and the small contact points (P) when the movable terminal (40) enters toward the fixed terminal (20), thereby allowing the fixed terminal (20) and the movable terminal (40) to conduct electricity.

At this time, the fixed terminal (20) and the movable terminal (40) are divided into contact points (P) formed by the contact point forming member (80), so that sufficient current carrying capacity is secured for the passage of high voltage direct current of the required capacity.

In addition, as seen in Fig. 2, an insulating support member (83) is further arranged between the contact point forming member (80) and the first spring (50), so that an insulating support state is formed between the first spring (50) and the contact point (P) formed in the contact point forming member (80) by the insulating support member (83).

In addition, as shown in Fig. 7, when the available support (70) is melted due to abnormal overheating of the peripheral area and the movable terminal (40) advances in the opposite direction to the fixed terminal (20), the small contact points (P) formed on the back side of the insulating core (81) are individually disconnected from the contact portion (21) of the fixed terminal (20), so that the connection between the fixed terminal (20) and the movable terminal (40) is disconnected.

At this time, the contact portion (21) of the fixed terminal (20) is disconnected from the movable terminal (40) through individual disconnection with small contact points (P) having a narrow contact area, so that a large-scale arc discharge phenomenon is prevented during the disconnection process with the fixed terminal (20).

The above-described embodiments and other embodiments of the present invention are merely exemplary, and those skilled in the art to which the present invention pertains will readily appreciate that various modifications and equivalent other embodiments are possible.

Therefore, it will be well understood that the present invention is not limited to the forms mentioned in the above detailed description.

Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims. In addition, the present invention should be understood to include all modifications, equivalents, and substitutes within the spirit and scope of the present invention defined by the appended claims.

In a high-voltage direct current temperature fuse according to the present invention, when the fixed terminal and the movable terminal are disconnected, the small contact points formed in the contact portions of the small contact forming members are individually disconnected, so that the occurrence of a large-scale arc discharge can be prevented.

Claims (11)

A fixed terminal that is connected to the first lead and has a contact portion formed; A movable terminal that is connected to the first lead and is energized, enters in the direction of the fixed terminal in normal times, and exits in the opposite direction of the fixed terminal when the surrounding area is abnormally heated, and has a contact portion formed; and It is configured to include a contact point forming member having a plurality of contact points formed in a contact portion facing the contact portion of the terminal requiring contact formation, and is arranged between the contact portion of the fixed terminal and the contact portion of the movable terminal. The above-mentioned small contact forming member, when the movable terminal enters in the direction of the fixed terminal, makes a divided contact with the contact part of the facing terminal through the small contact points formed in the contact part of the contact part, and conducts current between the contact part of the fixed terminal and the contact part of the movable terminal through the dividedly-contacted small contact points. A high-voltage direct current thermal fuse characterized in that when the above-mentioned movable terminal is moved in the opposite direction of the fixed terminal, the contact portion of the fixed terminal and the contact portion of the movable terminal are disconnected through individual disconnection of the small contacts that come into contact with the above-mentioned contact portion. A conductive case made of a cylindrical body made of a challenging material, connected to an output terminal, and having an open receiving space on one side; A fixed terminal installed in an insulated state from the current carrying case through an insulating bushing on one side of the above current carrying case and connected to the input lead; A usable support body installed on the other side of the receiving space of the above-mentioned power case and melting when overheated; A movable terminal which is installed in a space formed between an insulating bush and a movable support in a forward-retreating structure while in a energized state with the above-mentioned energized case, and which advances toward the fixed terminal when supported by the movable support, and advances in the opposite direction of the fixed terminal when the support by the movable support is offset; and A high-voltage direct current thermal fuse characterized by comprising a contact point forming member having a plurality of contact points formed of a contact wire at a contact point facing the contact point of a terminal requiring contact formation, the contact point forming member being positioned between the contact point of the fixed terminal and the contact point of the movable terminal. A high-voltage direct current thermal fuse characterized in that in the second paragraph, a first spring is installed that forces the movable terminal in the opposite direction to the fixed terminal, and a second spring is installed that is supported on the available support and forces the movable terminal in the direction of the fixed terminal. In claim 1 or claim 2, the contact forming member is formed of an insulating body having a length longer than the set discharge shielding distance, and has an insulating core formed with a contact portion facing the contact portion of the terminal requiring contact formation; A high-voltage direct current thermal fuse characterized by comprising a plurality of contact wires each of which is arranged on the insulating core and forms a plurality of small contact points that contact the contact portion of a terminal that requires contact formation at the contact portion. A high-voltage direct current thermal fuse, characterized in that in the third paragraph, a contact part contact part is formed on both sides of an insulating core constituting the contact part forming member, a plurality of contact points formed of a contact wire and forming a contact part and a contact point of a fixed terminal are formed on the contact part contact part formed on one side of the insulating core, and a plurality of contact points formed of a contact part and a contact point of a movable terminal are formed on the contact part contact part formed on the other side of the insulating core. A high-voltage direct current thermal fuse characterized in that in the third paragraph, the small contact forming member is formed in a state where the contact part of one of the contact part of the fixed terminal and the contact part of the movable terminal is electrically connected to the contact part of the terminal, and the contact part contact part facing the contact part of the terminal requiring contact is formed, and the contact part contact part is formed with small contact points that are composed of a contact part wire and are in divided contact with the contact part of the facing terminal. A high-voltage direct current thermal fuse, characterized in that in the third paragraph, a plurality of compartment alignment paths are formed longitudinally in the insulating core by compartment shielding pieces, and a contact wire is arranged in each of the compartment alignment paths. A high-voltage direct current temperature fuse, characterized in that in the third paragraph, a plurality of longitudinally penetrating segment alignment paths are formed in the insulating core, and a contact wire is arranged to penetrate each of the segment alignment paths. A high-voltage direct current thermal fuse, characterized in that in the 7th paragraph, an end lead groove is formed in the contact portion of the insulating core to lead the ends of the contact wires aligned in the compartment alignment path, and the ends of the contact wires aligned in each compartment alignment path are aligned by leading into the end lead groove. A high-voltage direct current thermal fuse, characterized in that in the 8th paragraph, an end lead groove is formed in the contact portion of the insulating core to lead the ends of the contact wires aligned in the compartment alignment path, and the ends of the contact wires aligned in each compartment alignment path are aligned by leading into the end lead groove. A high-voltage direct current thermal fuse characterized in that, in the third paragraph, an insulating support member is further arranged between the contact point forming member and the first spring, such that an insulating support state is formed between the first spring and the contact point formed in the contact point forming member by the insulating support member.

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