JP2001243871A - Fuse device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accurately, positively and easily replaceable fuse device. SOLUTION: A hollow case body 21 is provided with a seeing-through display window 42. A fixed terminal 66 is provided, part of which is located in the case body 21. One end of a fusible body 76 fusible with an overcurrent is connected to a fixed terminal 66. A movable terminal 71, part of which is located in the case body 21, is tensely energized and connected to the other end of the fusible body 76. With the fusion of the fusible body 76, a fusion display portion 75 of the movable terminal 71 is moved to the display window 42. The fusion of the fusible body 76 can be identified from the outside via the display window 42 by the existence of the fusion display portion 75.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse device provided with a fusible member that blows due to overcurrent.

[0002]

2. Description of the Related Art Conventionally, this type of fuse device is used to electrically disconnect an electric device from a power supply device when an abnormality occurs.
In particular, in the case of an electric device which is required to have high reliability and receives power supply from a power source through two electric wires, the electric device has a 2
It may be attached to each of the wires. For this reason, in an electrical device using two such fuse devices, it is necessary to remove both fuse devices during an insulation test on the electrical device side for wiring work and maintenance.

Further, when the fusible material of the fuse device is blown due to a failure of an electric device or a surge from a power supply device, particularly when an abnormal current flowing through the electric wire is an overcurrent relatively small with respect to the rated current of the fusible material, Only one fuse unit melts. For this reason, a fuse device having a fusible body that has not been blown may not be replaced during maintenance work. However, the fuse device that has not been blown is also deteriorated due to the flow of the overcurrent, and the maintenance management is complicated, for example, the fusible body may suddenly blow in a steady state after the maintenance work is completed.

Here, when an electric device forms a complicated system, since this system has a plurality of electric devices, power supply from the power supply device to each electric device is performed by many branch circuits. Is accompanied. In this system, since two fuse devices are attached to each branch circuit, a large number of fuse devices are connected to this system. For this reason, when removing the fuse device at the time of maintenance inspection or troubleshooting, there is a possibility that the fuse device of another circuit may be accidentally removed.

Further, in a DC power supply circuit, when one of two wires of a power supply device and an electric device connected by two wires is grounded at one point, ungrounded when a fault occurs. It is preferable that the fusible body of the fuse device of the side electric wire is blown. In this case, the fuse device can be installed only on the non-installed electric wire, and the electric device cannot be completely disconnected for maintenance.

[0006]

As described above, when a fuse device having a fusible material that is blown by an overcurrent is attached to each of two electric wires of an electric device, it is necessary to perform maintenance work. There is a possibility that a fuse device having a fusible material that has deteriorated without being blown may be left as it is without being replaced, and when the fuse device is attached to each of two branch circuits of an electric device. When the fuse device is removed at the time of maintenance inspection or troubleshooting, there is a possibility that a fuse device of another circuit may be accidentally removed. For this reason, there is a problem that replacement of only the fuse device that needs replacement is not accurate and easy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuse device capable of performing accurate replacement reliably and easily.

[0008]

According to a first aspect of the present invention, there is provided a fuse device having a hollow case body provided with a display window through which the inside can be seen from the outside, and a fixed terminal at least partially located in the case body. A fusible body located in the case body and one end connected to the fixed terminal and blown by overcurrent, and at least a part is located in the case body, and a part located in the case body is the other end of the fusible body. A fuse mechanism having a movable terminal that is attached by being pulled and biased, moves with respect to the display window by blowing of the fusible material, and displays the fusing of the fusible material outside the case body through the display window. It is what you have.

In this configuration, when an overcurrent flows between the fixed terminal and the movable terminal of the fuse mechanism, the fusible body of the fuse mechanism is blown. At this time, the movable terminal moves with respect to the display window of the case body because the fusible member has pulled and urged the movable terminal. As a result, the fusing of the fusible material can be known from the display window, so that the fusing of the fusible material can be easily confirmed from outside the case body via the display window. For this reason, it is possible to easily confirm which of the meltable bodies in the case has blown, so that a fuse mechanism that does not need to be replaced is not accidentally removed. Therefore, it is possible to reliably and easily replace the fuse mechanism accurately.

According to a second aspect of the present invention, there is provided a fuse device according to the first aspect.
The fuse device according to the above, further comprising a plurality of fuse mechanisms, wherein the case body has a plurality of display windows corresponding to the fuse mechanisms.

In this configuration, since a plurality of display windows corresponding to the fuse mechanisms are formed in the case body having the plurality of fuse mechanisms, for example, an electric device is provided between the fixed terminal and the movable terminal of each of the fuse mechanisms. In the case of connection to each of the plurality of branch circuits, the fuse mechanism is replaced at a time by replacing the case body at the time of maintenance and inspection of the electric device or at the time of handling a failure. As a result, the fuse mechanism degraded due to the failure of the electric device is not left without being replaced as it is, so that accurate replacement of the fuse mechanism becomes more reliable and easier.

According to a third aspect of the present invention, there is provided a fuse device according to the first aspect.
The fuse device according to claim 2, further comprising at least one pair of wiring terminals that are electrically insulated from each other and at least partially located inside thereof, and are electrically connected to one of the fixed terminal and the movable terminal when the case body is inserted. And a holder into which the case body is removably inserted.

In this configuration, for example, each wiring terminal of the holder is connected to each branch circuit which requires connection of the fuse mechanism, and the case body is inserted into this holder. At this time, since the fixed terminal and the movable terminal of each case body are electrically connected to one of the wiring terminals of the holder, each fuse mechanism in the case body can be removed simply by removing the case body from the holder and inserting the case body into the holder again. Are interchangeable. For this reason, replacement of the fuse mechanism becomes easier and faster.

According to a fourth aspect of the present invention, there is provided a fuse device according to the first aspect.
The fuse device according to any one of (3) to (3), further comprising a plurality of fuse mechanisms, wherein the fusible body is a conductor that does not blow due to overcurrent except for at least one of the plurality of fuse mechanisms.

In this configuration, by making the fusible material excluding at least one of the plurality of fuse mechanisms a conductor that does not blow due to overcurrent, the manufacturing cost can be reduced as compared with the case where all are fusible materials.

According to a fifth aspect of the present invention, there is provided a fuse device according to the third aspect.
Or the fuse device according to 4, wherein the case body includes a short-circuit body at least partly located outside the case body and short-circuiting the current, and the holders are electrically insulated from each other and at least partly inside the holder. And a pair of wiring terminals connected to the short-circuit body by inserting the case body and short-circuited by the short-circuit body.

[0017] In this configuration, the wire that needs to be blown is connected between the wiring terminal of the holder that conducts to the fixed terminal and the movable terminal of the fuse mechanism, and the holder that conducts to the short-circuit body to the electric wire that needs to short-circuit current. By connecting the wiring terminals, it is possible to cope with a case where the connection between the fuse mechanism and the conductor mechanism is specified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of a fuse device according to the present invention will be described below with reference to FIGS.

1 to 9, reference numeral 11 denotes a fuse device. The fuse device 11 is, for example, provided between a power supply device (not shown) electrically connected by two electric wires (not shown) and an electric device (not shown). When an overcurrent flows through one of these two wires, the wire is electrically disconnected.

As shown in FIGS. 1 to 5, the fuse device 11 includes a substantially casing-like case body 21.
Inside the case body 21, a hollow internal space 22 is formed. In addition, the case body 21 has a case body 23 that is opened to the side and downward, and an approximately space that is attached to the opening of the case body 23 from the side and closes the side of the opening to form an internal space 22. The pedestal body 24 has a flat plate shape. Further, the case body 21 is detachably inserted into a substantially casing-like holder 31 having an insertion opening 30 opened upward.

Further, the case body 23, the pedestal body 24 and the holder 31 are made of, for example, a synthetic resin such as aromatic polyester, polyethylene terephthalate, phenol resin or epoxy resin, or a reinforced composite material containing glass fiber of these synthetic resins. Molded with heat-resistant synthetic resin.

A display window 42 is cut out above the surface where the case body 23 is opened, that is, above the left side surface shown in FIG. 1, and this display window 42 is formed with the display window 42. 4, that is, on the left side on the front side of the upper surface shown in FIG. 4. Further, the display window 42 is formed in a substantially concave shape from the left side surface of the upper surface to the surface facing the left side surface, that is, the right side surface shown in FIG.

An exhaust port 43 is formed in the case main body 23 by cutting out the exhaust port 43. The exhaust port 43 is formed on the surface on which the exhaust port 43 is formed, that is, on the upper surface side of the rear surface shown in FIG. It is formed on the right side. This exhaust port 43 is
The rear surface is formed in a substantially concave shape from the right side to the left side, and is used for venting gas in the internal space 22 of the case body 21.

Further, a substantially columnar caulking projection 44 projecting substantially perpendicularly from the left side surface is formed substantially at the center of the opening on the left side surface of the case body 23. The caulking protrusion 44 protrudes from the left side surface of the case body 23. On the right side of the case body 23, a substantially concave meat steal portion 45 is formed, and the meat steal portion 45 reduces the manufacturing cost in terms of material.

A short-circuit body 46 as a flat U-shaped short bar for short-circuiting the current flowing between the connected electric wires is provided on the surface facing the upper surface of the case body 23, that is, on the bottom surface shown in FIG. Is attached. This short circuit
Reference numeral 46 is provided outside the case main body 23 and is formed of, for example, phosphor bronze, beryllium copper, or a silver-coated surface thereof having excellent conductivity.

At a substantially central portion on the right side of the bottom surface of the case body 23, there is formed an elongated substantially flat plate-shaped main fitting piece 47 which projects substantially vertically outward from the bottom surface. On the left side of the tip of the main fitting piece 47, a main fitting claw 48 protruding toward the right side is formed, and on the left side of the base end of the main fitting piece 47. Is formed with a fixing piece 49 protruding outward.

Further, on the left side of the bottom of the case body 23, there are formed a pair of sub-fitting pieces 50a, 50b in the form of slender and substantially flat plates protruding outward from the bottom surface substantially vertically. These sub-fitting pieces 50a and 50b are formed at line-symmetrical positions around the main fitting piece 47. In addition, these sub-fitting pieces 50
Sub fitting claws 51a, 51b projecting toward the left side are formed on the right side of the ends of the respective a, 50b.

Here, the short-circuit body 46 is formed by a main fitting claw 48 of a main fitting piece 47, a fixing piece 49, and sub-fitting claws 51a, 51b of a pair of sub-fitting pieces 50a, 50b. The case body 23 is fitted and fixed to the bottom surface side.

When the pedestal 24 is attached to the case body 23, the left side of the case 21 is defined as the outer surface, and the back opposite to the outer surface is defined as the inner surface. In this case, a display window forming piece 62 protruding upward is formed at the upper right end of the pedestal 24 when the pedestal 24 is viewed from the outer surface. This display window forming piece
Reference numeral 62 denotes a state in which the pedestal 24 is attached to the case main body 23, and closes the left side of the display window 42 of the case main body 23.

Further, with the pedestal body 24 viewed from the outer surface,
On the upper left side of the pedestal body 24, an exhaust port forming piece 63 protruding toward the left side is formed. This exhaust port forming piece
63 closes the left side of the exhaust port 43 of the case body 23 with the pedestal body 24 attached to the case body 23.

Further, in a state where the pedestal body 24 is viewed from the outer surface, a caulking opening 64 which is opened vertically from the outer surface to the inner surface is provided substantially at the center of the outer surface of the pedestal body 24. I have. The caulking opening 64 is formed at a position where the caulking protrusion 44 of the case main body 23 is inserted in a state where the pedestal body 24 is attached to the case main body 23, and the caulking opening 64 is formed.
With the caulking protrusion 44 inserted through 64,
By melting the tip of 44, the case body 23 and the pedestal body 24 are thermally caulked and joined.

In the state where the pedestal body 24 is viewed from the inner surface,
At substantially the center of the pedestal body 24, a terminal support portion 65 that supports fixing of a terminal or the like is formed. Then, when the pedestal 24 is viewed from the inner surface, a fixed terminal 66 is fixed to the right side of the terminal support portion 65 from above to below.

First, the tip side of the fixed terminal 66 is
After being inserted through an insertion opening 67 opened substantially at the middle in the vertical direction from the inner surface to the outer surface of the base 44, a concave formed downward from the middle of the outer surface of the pedestal body 24 and the vertical direction. It is fitted in a groove-shaped outer fixed terminal mounting groove 68. Further, the distal end side of the fixed terminal 66 is bent and formed downward from a substantially middle in the up-down direction on the terminal support portion 65 on the inner surface side of the pedestal body 24 facing the outer fixed terminal mounting groove 68. The inner fixed terminal mounting groove 69 having a concave groove shape is fitted and inserted. Further, the distal end side of the fixed terminal 66 is
And is attached to the pedestal body 24 by being engaged with an engaging portion 70 formed on the terminal support portion 65 which is substantially intermediate in the vertical direction.

The fixed terminal 66 has a distal end extending outside the case body 21 and a base end located in the internal space 22 of the case body 21 with the pedestal 24 attached to the case body 23. .

Further, when the pedestal body 24 is viewed from the inner surface, on the left side of the terminal supporting portion 65 of the pedestal body 24, that is, at a position where the pedestal body 24 is electrically insulated from the fixed terminal 66 and is opposed to the fixed terminal 66, The movable terminal 71 is disposed substantially downward from above. The movable terminal 71 is formed such that the conductive piece 72 formed at the tip of the movable terminal 71 is located at a position where the outer surface and the inner surface of the pedestal body 24 face each other, and downward from a substantially middle in the vertical direction. The outer movable terminal mounting groove 73 and the inner movable terminal mounting groove 74 in the form of a concave groove are fitted and engaged with each other, and are mounted on the pedestal body 24. Also,
The movable terminal 71 is fixed with the pedestal body 24 attached to the case body 23 and the distal end extended outside the case body 21, and the base end is located in the internal space 22 of the case body 21. .

At the base end of the movable terminal 71, a fusing indicator 75 is formed by bending the base end of the movable terminal 71 toward the fixed terminal 66. A color that can be distinguished from the color of the case body 21, such as white, is applied to the fusing display portion 75, for example.

Here, the fixed terminal 66 and the movable terminal 71 are
It is formed of, for example, phosphor bronze, beryllium copper, or a silver-coated surface thereof having excellent conductivity.

A fusible member 76 as a fuse element that is blown by a rise in temperature due to passage of an overcurrent is stretched between the base end of the fixed terminal 66 and the base end of the movable terminal 71. The fusible body 76 is configured such that the base end side of the movable terminal 71 is fixed terminal 66.
The movable terminal 71 is elastically deformed toward the base end of the movable terminal 71.
The one end is connected to the base end of the fixed terminal 66, and the other end is connected to the base end of the movable terminal 71. It should be noted that the fusible body 76 may be any material, for example, a material in which different metals are formed in a layer and are alloyed with a low melting point at the time of fusing. The fixed terminal 66, the movable terminal 71, and the fusible member 76 are provided in the fuse mechanism 80.

Here, when the fusible body 76 is blown, the tensile force by the fusible body 76 is released from the movable terminal 71, and the fusing display portion 75 of the movable terminal 71 is directed toward the display window 42 of the case body 21. It moves and the fusing display portion 75 can be confirmed from outside the case body 21 via the display window 42, that is, the external display window 42
Is elastically deformed so that the fusing of the fusible body 76 can be confirmed by the presence / absence of the fusing display portion 75 via the.

As shown in FIGS. 6 to 8, a main fitting piece 47 and a fixing piece of the case main body 23 are provided above the holder 31.
49, in a state where the short-circuit body 46 is fitted and fixed by the pair of sub-fitting pieces 50a, 50b, the main fitting piece 47, the fixing piece 49, and the pair of sub-fitting pieces.
A short-circuit insertion opening 82 into which the 50a, 50b and the short-circuit body 46 are removably inserted is opened. In addition, above the holder 31,
A fusible insertion opening 83 into which the lower portion of the pedestal body 24, the tip of the fixed terminal 66, and the tip of the movable terminal 71 are detachably inserted is opened. The fusible insertion port 83 is provided in parallel with the short-circuit insertion port 82, and is larger than the short-circuit insertion port 82. Here, the short circuit insertion port 82 and the soluble insertion port 83 are provided in the insertion port 30.

Further, at the opposing positions on both inner surfaces of the short-circuit insertion port 82 and the fusible insertion port 83, a concave groove extending from the base end of the short-circuit insertion port 82 and the fusible insertion port 83 along the opening direction. The two pairs of mounting grooves 84a, 84b, 84c, 84d are formed in two pairs, that is, four pairs in total. Further, at the bottoms of the short-circuit insertion port 82 and the fusible insertion port 83 between the pair of mounting grooves 84a, 84b, 84c, 84d, the mounting ports 85a, 85b, 85c, 85d are provided.
Are formed two by two in total.

Then, a pair of mounting grooves 84a, 84b, 84c, 8
4d, the U terminals 86 as wiring terminals formed in a substantially U shape are attached to each other while being electrically insulated from each other in a state where both outer sides are fitted. As shown in FIG. 9, the U terminal 86 is a terminal main body formed in a flat substantially U-shape.
A terminal piece 88 protruding downward from the base end of 87 is formed, and a pair of locking pieces 89a and 89b protruding toward the opposite side are formed at the base end of the terminal piece 88. Each is formed.

Further, the U terminal 86 is provided with the ends of the terminal piece 88 facing the holder 31 and the mounting grooves 84a, 84b, 84c, and 84d of the short-circuit insertion port 82 and the fusible insertion port 83, on both sides of the terminal body 87. The terminal piece 88 and the locking piece
After the 89a and 89b are inserted through the mounting holes 85a, 85b, 85c and 85d of the holder 31, the distal ends of the U-terminals 86 are twisted along the bottom surface of the holder 31 from the locking pieces 89a and 89b. Fixed.

Here, each inner portion of the terminal main body 87 of the U terminal 86 attached to each of the mounting grooves 84a and 84b of the short-circuit insertion opening 82 has the case 21 inserted into the holder 31 when the case 21 is inserted into the holder 31. The short-circuits 46 are connected so as to sandwich them, and are electrically short-circuited by the short-circuits 16. Also, a soluble insertion port
Each inner portion of the terminal body 87 of the U terminal 86 attached to the mounting groove 84c of the 83 has the outer movable terminal mounting groove 73 and the inner movable terminal mounting groove of the case body 21 in a state where the case body 21 is inserted into the holder 31. The conductive piece of the movable terminal 71 is fitted so as to sandwich
Conducted with 72. Further, each inner portion of the terminal body 87 of the U terminal 86 attached to the attachment groove 84d of the fusible insertion port 83 is a case body.
With the 21 inserted into the holder 31, the case 21 is fitted so as to sandwich the outer fixed terminal mounting groove 68 and the inner fixed terminal mounting groove 69 of the case body 21 so as to be electrically connected to the front ends of the fixed terminals 66, respectively.

Next, the operation of the embodiment will be described.

One of the electric wires of the power supply device and the electric device connected by the two electric wires is connected between the terminal pieces 88 of the U terminal 86 of the holder 31 electrically connected to the fixed terminal 66 and the movable terminal 71. Then, the other electric wire is connected between the terminal pieces 88 of the U terminal 86 of the holder 31 which is conducted to the short-circuit body 46. After that, the case body 21 is inserted into the holder 31.

In this state, when an overcurrent flows through the two electric wires, the fusible body 76 is blown. Then, the tension of the movable terminal 71 by the fusible member 76 is released, and the movable terminal 71 is released.
Is released and the proximal end returns to its original position. At this time, the fusing display portion 75 of the movable terminal 71 moves to the display window 42 of the case body 21, and the fusing display portion 75 can be confirmed from the outside via the display window 42.

Next, the case body 21 in which the fusing display portion 75 is displayed on the display window 42 is removed from the holder 31, and the case body 21 in which the fusible body 76 is not blown is attached to the holder 31.

As described above, according to the embodiment, the overcurrent flows between the fixed terminal 66 and the movable terminal 71, so that the fusible member 76 is blown. Since the fusing display portion 75 moves back to the display window 42, the fusing of the fusible body 76 can be confirmed by the presence or absence of the fusing display portion 75 from outside the case body 21 via the display window 42. For this reason,
The operation of searching for the case body 21 in which the fusible body 76 has blown can be easily performed. Therefore, since the case body 21 that does not need to be replaced is not accidentally removed, the case body 21 in which the fusible body 76 has blown out can be replaced accurately and easily.

Further, a power supply device and an electric device are connected to each other.
Holder 31 in which terminal strip 88 of U terminal 86 is connected to this wire
When the overcurrent flows from the power supply device to the electric device by inserting the case body 21 into the case body 21, the fusible body 76 in the case main body 21 is blown. For this reason, by simply removing the case body 21 from the holder 31 and inserting the case body 21 in which the fusible body 76 is not blown into the holder 21, the blown fusible body 76 can be replaced. Easy and quick.

Further, since one end between the terminal pieces 88 of the U terminal 86 connected to the two electric wires is conducted by the short-circuit body 46 as a conductor, each of the terminal pieces 88 of the U terminal 86 is connected to the fixed terminal 66.
In addition, the manufacturing cost can be reduced as compared with the case where conduction is performed by the movable terminal 71 and the flow of overcurrent between the terminal pieces 88 is prevented.

Also, a terminal piece of the U terminal 86 of the holder 31 electrically connected to the fixed terminal 66 and the movable terminal 71 is connected to the electric wire which needs to be blown.
88, and by connecting between the terminal piece 88 of the U terminal 86 of the holder 31 which is in conduction with the short-circuiting body 46, to the electric wire which needs to short-circuit the current, the electric wire connecting the fuse mechanism 80 and the conductor mechanism is formed. Even if specified, it can be handled.

Since the case body 21 is provided with the exhaust port 43, the pressure difference in the internal space 22 of the case body 21 when the fusible body 76 is blown can be eliminated. Can be prevented.

Further, the main fitting piece 47 and the fixing piece of the case body 21 are fixed.
A short-circuit body 46 is fitted and fixed by 49 and a pair of sub-fitting pieces 50a and 50b, and a fixed terminal is formed by an insertion hole 67 of the case body 21, an outer fixed terminal mounting groove 68 and an inner fixed terminal mounting groove 69. 66 is fixed, and the outer movable terminal mounting groove of this case body 21
Since the movable terminal 71 is fixed by the 73 and the inner movable terminal mounting groove 74, compared with the case where the short-circuit body 46, the fixed terminal 66 and the movable terminal 71 are attached to the case body 21 by welding or the like,
The work when attaching the short-circuit body 46, the fixed terminal 66, and the movable terminal 71 to the case 21 can be facilitated.

Further, the fusing display portion 75 of the movable terminal 71 is colored with a color such as white which can be distinguished from the color of the case body 21 so that the fusing display portion via the display window 42 when the fusing member 76 is blown. 75 confirmations can be made easily.

Then, the insertion port 30 of the holder 31 is connected to the short-circuit insertion port.
Since the U terminal 86 that is electrically connected to the short-circuit body 46 and the U terminal 86 that is electrically connected to the fixed terminal 66 and the movable terminal 71 can be reliably insulated by dividing the short-circuit body 82 and the soluble insertion port 83, the short-circuit body can be accurately formed. The current flowing through 46 and the fusible body 76 can be secured.

Each of the mounting grooves 84a, 84b, 84 of the holder 31
In the state where both sides of the U terminal 86 are fitted in c and 84d, the retaining pieces 89 of the U terminal 86 are fitted into the mounting openings 85a, 85b, 85c and 85d of the holder 31.
a, 89b and the terminal piece 88,
Each U terminal 86 can be securely fixed to the holder 31 simply by twisting the a, 89b and the terminal piece 88.
86 can be easily installed.

Further, by inserting the case body 21 into the holder 31, the mounting groove 84 of the short-circuit insertion opening 82 of the holder 31 is formed.
The inner portions of the U terminals 86 attached to the a and 84b are electrically connected to the short-circuit body 46, and the inner portions of the U terminals 86 attached to the mounting grooves 84c of the fusible insertion port 83 are connected to the outer movable terminal mounting groove 73 and the inner portion. The conductive piece of the movable terminal 71 is inserted into the movable terminal mounting groove 74, respectively.
At the same time, each inner portion of the U terminal 86 mounted in the mounting groove 84d of the fusible insertion port 83 is inserted into the outer fixed terminal mounting groove 68 and the inner fixed terminal mounting groove 69 to conduct with the fixed terminal 66. .
For this reason, the work of attaching and detaching the case body 21 to and from the holder 31 can be facilitated.

Further, since the fusible insertion opening 83 of the holder 31 is larger than the short-circuit insertion opening 82, when the case body 21 is attached to the holder 31,
Since the orientation of 21 is not mistaken, the work of attaching case body 21 to holder 31 can be facilitated.

In the above embodiment, the case 21
Although the configuration in which only one fuse mechanism 80 is provided has been described, the present invention is not limited to such a configuration, and the case body 21 includes a plurality of fuse mechanisms 80 and a plurality of display corresponding to the fuse mechanisms 80. A window 42 may be provided.
With this configuration, when each of the fuse mechanisms 80 is connected to, for example, each of a plurality of branch circuits (not shown) of the electric device, the replacement of the fuse device 11 at the time of maintenance and inspection of the electric device or at the time of handling a failure is performed. Since each fuse mechanism 80 can be replaced at a time, the fuse mechanism 80 that has been deteriorated due to a failure in the electric device does not need to be left as it is without being replaced as it is. Easy.

Further, the fusible member 76 excluding at least one of the plurality of fuse mechanisms 80 provided in the case body 21 can be used as a conductor. With this configuration, the manufacturing cost can be reduced as compared with the case where all the fuse mechanisms 80 are made of the fusible material 76.

Further, the configuration in which the fusing display portion 75 of the movable terminal 71 moves toward the display window 42 due to the fusing of the fusible member 76 has been described, but the present invention is not limited to such a configuration.
Any structure may be used as long as the melting of the fusible body 76 can be confirmed from the outside via the display window 42. Therefore, for example, in a state before the fusible body 76 is blown, the movable terminal 71 is disposed at a position where the fusing display unit 75 can be confirmed from the outside via the display window 42, and
By the fusing of 76, the fusing display section from the outside via the display window 42
75 may be configured to move from a confirmable position to a non-confirmable position. With such a configuration, the same operation and effect as those of the above-described embodiment can be obtained.

[0063]

According to the fuse device of the first aspect,
Since the movable terminal moves with respect to the display window due to the fusing of the fusible material, and the movable terminal indicates the fusing of the fusible material in the display window,
Since the melting of the fusible body can be easily confirmed from the outside of the case body, and further, the fusible body in which case body has been blown can be easily confirmed, so that the accurate replacement of the fuse mechanism can be reliably and easily performed.

According to the fuse device of the second aspect, in addition to the effect of the fuse device of the first aspect, for example, a plurality of branches of the electric device are provided between the fixed terminal and the movable terminal of each fuse mechanism provided in the case body. When connected to each circuit, the fuse mechanism can be replaced at a time simply by replacing the case body during maintenance and inspection of this electrical device or handling a failure, so the fuse mechanism that has deteriorated due to failure of the electrical device can be replaced as it is The fuse mechanism is not left unattended, and accurate replacement of the fuse mechanism can be performed more reliably and easily.

According to the fuse device of the third aspect, in addition to the effect of the fuse device of the first or second aspect, when the case body is inserted into the holder, each of the fixed terminal and the movable terminal of the case body becomes one of the holder. Since it is electrically connected to one wiring terminal, the fuse mechanism can be replaced simply by attaching and detaching the case body to and from the holder, and the replacement of the fuse mechanism can be performed more easily and quickly.

According to the fuse device of the fourth aspect, in addition to the effect of the fuse device of the first aspect, the fusible material excluding at least one of the plurality of fuse mechanisms is blown by overcurrent. When the conductor is not used, the manufacturing cost can be reduced as compared with the case where the conductor is entirely fusible.

According to the fuse device of the fifth aspect, in addition to the effect of the fuse device of the third or fourth aspect, in addition to the effect of the fuse device of the third aspect, the electric wire which needs to be blown is connected between the fixed terminal and the movable terminal of the fuse mechanism and the wiring terminal of the holder. And connecting the wiring terminals of the holder that conducts to the short-circuiting body to the electric wire that requires a current short-circuit, it is possible to cope with the case where the connection between the fuse mechanism and the conductor mechanism is specified.

[Brief description of the drawings]

FIG. 1 is a left side view showing an embodiment of a fuse device of the present invention.

FIG. 2 is a right side view showing the fuse device.

FIG. 3 is a rear view showing the fuse device.

FIG. 4 is a top view showing the fuse device.

FIG. 5 is a bottom view showing the fuse device.

FIG. 6 is a top view showing a holder of the fuse device.

FIG. 7 is a left side view showing a holder of the fuse device.

FIG. 8 is a bottom view showing a holder of the fuse device.

FIG. 9 is a perspective view showing wiring terminals of the fuse device according to the first embodiment;

[Explanation of symbols]

 11 Fuse device 21 Case body 31 Holder 42 Display window 46 Short circuit body 66 Fixed terminal 71 Movable terminal 76 Soluble material 80 Fuse mechanism 86 U terminal as wiring terminal

 ──────────────────────────────────────────────────の Continued on the front page (71) Applicant 000103976 Origin Electric Co., Ltd. 1-16-1 Takada, Toshima-ku, Tokyo (72) Inventor Hiromi Sato 2-7-17 Shimomeguro, Meguro-ku, Tokyo Daito Communication Equipment (72) Inventor Keiichi Hirose 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Mikio Yamazaki 2-3-1 Otemachi, Chiyoda-ku, Tokyo Japan Inside Telegraph and Telephone Co., Ltd. (72) Kengo Machida, inventor 10-13 Minamimachi, Hanno City, Saitama Prefecture Inside Shindengen Kogyo Co., Ltd. (72) Shingo Ueno 1-1-18-1, Takada, Toshima-ku, Tokyo Origin Electric F term (reference) 5G502 AA01 BB19 CC19 CC45 CC51 DD04

Claims (5)

[Claims] 1. A case body having a hollow inside with a display window through which the inside can be seen from the outside, a fixed terminal at least partially located in the case body,
A fusible body located in the case body and one end connected to the fixed terminal and blown by overcurrent, and at least a part is located in the case body, and a part located in the case body is the other end of the fusible body. A fuse mechanism having a movable terminal that is attached by being pulled and biased, moves with respect to the display window by blowing of the fusible material, and displays the fusing of the fusible material outside the case body through the display window. A fuse device comprising: a fuse device; 2. The fuse device according to claim 1, further comprising a plurality of fuse mechanisms, wherein the case body has a plurality of display windows corresponding to the fuse mechanisms. 3. The case further comprising at least one pair of wiring terminals which are electrically insulated from each other and at least partially located inside thereof, and which are electrically connected to one of the fixed terminal and the movable terminal by inserting a case body. 3. The fuse device according to claim 1, further comprising a holder into which the body is detachably inserted. 4. The method according to claim 1, wherein a plurality of fuse mechanisms are provided, and the fusible body is a conductor that does not blow due to overcurrent except for at least one of the plurality of fuse mechanisms. The fuse device as described. 5. The case body includes a short-circuit body at least partially located outside the case body to short-circuit current, the holders are electrically insulated from each other and at least partially located in the holder, respectively. 5. The fuse device according to claim 3, further comprising a pair of wiring terminals connected to the short-circuit body by inserting the case body and short-circuited by the short-circuit body.