JPS5910011B2 - Super fast-acting fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an ultra-fast-acting fuse, and more particularly to an ultra-fast-acting fuse that is characterized by being able to quickly extinguish an arc after blowing out.

[Prior art and its problems] Conventional ultra-fast-acting fuses generally have a structure in which electrodes with large heat capacity and strong heat absorption are provided, the distance between the electrodes is shortened, and a fuse wire is stretched between them. ing.

In recent years, in order to protect integrated circuits, there has been a strong desire for ultra-fast-acting fuses with extremely fast cut-off times, where the distance between the electrodes has been shortened to 1 to 2 meters (11 L). Because the distance between them is very short, the arc does not extinguish after fusing, and with AC power supplies, the arc continues until the voltage approaches zero, and the arc time is longer than the melting time, and with DC power supplies, the arc time In DC power supplies, the electrodes melt and evaporate due to the arc, and the arc cannot be extinguished until the distance between the electrodes becomes longer.

[Purpose of the invention]

The present invention solves the above-mentioned problems.As for the fusing characteristics, the distance between the electrodes is shortened to achieve instantaneous fusing, and as for the arc characteristics, the distance between the electrodes is increased to achieve the arc time. We provide ultra-fast-acting fuses that shorten the time.

[Structure of the invention]

FIGS. 1 and 2 show an ultra-fast-acting fuse according to an embodiment of the present invention.

Reference numeral 1 denotes an insulating substrate, and on this substrate 1, two terminal electrode columns 2 and 4 having substantially equally large heat capacities are erected at a distance from each other.

Furthermore, there is an intermediate electrode column 3 which is insulated from these terminal electrode columns 2 and 4 and which has almost the same large heat capacity and produces the same effect as shortening the distance between the electrodes at the time of fusing.
4 and are erected in parallel at approximately equal intervals.

In other words, the terminal electrode columns 2 and 4 and the intermediate electric pole 3 are arranged so that the distance (e) between the intermediate electrode column 3 and both terminal electrode columns 2 and 4 is smaller than the distance N between both terminal electrode columns 2 and 4. Each is erected at each vertex of the triangle.

Normally, the distance between the intermediate electrode column 3 and the terminal electrode columns 2 and 4 is 1 to 2.
Selected as 11L7IL.

5 and 6 are fuse wires, which are stretched from one terminal electrode column 2 to the other terminal electrode column 4 via the intermediate electrode column 3.

[Action of the invention]

In the ultra-fast-acting fuse configured as described above, the terminal electrode columns 2 and 4 of dog heat capacity and the intermediate electrode column 3 are connected between the lZ (1 to 1).
Strongly absorbs the heat generated by the fuse wires 5 and 6 (2 wings),
The thermal equilibrium state is maintained at a high level by dissipation, and when an overcurrent slightly higher than the heat absorption capacity flows, the thermal equilibrium state is broken and the fuse wire 5 or 6 is instantly blown out.

Thus, the presence of the intermediate electrode column 3 reduces the fusing time in proportion to (m/M), and this produces the same effect on fusing characteristics (ultra-fast cutting performance) as when the distance between the electrodes is shortened. .

If either one of the fuse wires 5 or 6 blows out first, the resulting arc acts directly on the other fuse wire and triggers it to blow, thereby disconnecting the intermediate electrode column 3 from the circuit. The arc will fly between the two terminal electrode columns 2 and 4.

Since the arc length is approximately doubled (more precisely, M/m times), the arc resistance increases rapidly and the arc is quickly extinguished.

As an example, an ultra-fast-acting fuse according to the present invention in which the distance between the terminal electrode pillars 2 and 4 and the intermediate electrode pillar 3 is 1 mm and the rated current is two people, and a fuse without intermediate electrode pillars and the distance between the electrodes. Table 1 below shows the fusing time, arcing time, and interruption time when a conventional ultra-fast-acting fuse with a diameter of 1 mm and a rated current of two people is fused at a rated voltage of 125 V and a rated current of 200%. .

As can be seen from the table, the present invention achieves a much shorter arc time than conventional ultra-fast-acting fuses, to the extent that the blowing time and the breaking time almost match.

In the present invention, the function of the intermediate electrode pillar 3 allows the interval between the two terminal electrode pillars 2 and 4, which are the original circuit terminals, to be relatively large, making it convenient to manufacture. There is also the added advantage that the mounting location does not require great precision.

That is, even if there is a slight difference in length between the fuse wires 5 and 6 stretched on the left and right sides of the intermediate electrode column 3, these fuse wires 5 and 6 will induce each other and simultaneously as described above. Because it melts, it does not substantially affect the ultra-fast blowing performance of the fuse.

As described above, according to the present invention, it is possible to easily manufacture an ultra-fast-acting fuse having extremely fast cut-off characteristics.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the ultra-fast acting fuse of the present invention, and FIG. 2 is a top view of the same. 1... Insulating substrate, 2, 4... Bent terminal electrode pillar, 3
...Middle electrode column, 5,6...Fuse wire.

Claims (1)

[Claims] 1. On an insulating substrate, two terminal electrode columns with almost equally large heat capacity and one intermediate electrode column with almost equally large heat capacity, which is insulated from both terminal electrode columns, are placed between the intermediate electrode column and both terminal electrodes. Install the fuse wire at each vertex of the triangle so that the distance between the pillars (e) is smaller than the distance M between both terminal electrode pillars, and connect the fuse wire from one terminal electrode pillar to the other terminal electrode pillar via the intermediate electrode pillar. An ultra-fast-acting fuse that is characterized by being fully extended.