JPH08329820A - Fuse blow sensing device - Google Patents

Abstract

PURPOSE: To provide a fuse blow sensing device of high reliability by furnishing a release whose end is detained with the tip of a blow indicator rod which protrudes when a fuse link has blown, and accommodating the release in a release case formed from a translucent material. CONSTITUTION: A fuse link 2 equipped internally with a blow indicator rod 5 is fixed to a main circuit conductor 1 through a fuse holder 3 and fuse stopper 4. A release 8 is accommodated slidably in a cylindrical release case 11 installed at a fuse holder 3 through a mounting metal piece 7, and one end of the release 8 is engaged by the tip of the indicator rod 5, and a sensing part, not illustrated, is installed at the other end. The rod 5 protrudes to the left when the fuse link 2 blows to press the release 8 for its actuation, and this is sensed by the sensing part. In this fuse blow sensing device, the case 11 is made from a translucent material, and it is made possible to easily check the rod detained condition with the release 8 acularly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse blowout detection device mounted on, for example, a high-voltage electromagnetic contactor (combination unit).

[0002]

2. Description of the Related Art FIG. 4 is a side view showing a conventional fuse blowout detecting device disclosed in, for example, Japanese Utility Model Laid-Open No. 1-148651 and Japanese Patent Laid-Open No. 5-47295. In the figure, 1 is a main circuit conductor, 2 is a fuse link fixed to the main circuit conductor 1, 3 is a fuse holder for fixing the fuse link 2 to the main circuit conductor 1, and 4 is attached to the fuse holder 3. It is a fuse stopper that positions the tip of the fuse link 2.

Reference numeral 5 denotes a blow-out indicating rod which is built in the fuse link 2 and protrudes when the fuse link 2 is blown, 6 is a cylindrical release case attached to the fuse holder 3 via a mounting metal fitting 7, and 8 is a release case. The release 8 is slidably provided in the release case 6. One end of the release 8 engages with the tip of the fusing indicator rod 5 in the release case 6.

Next, the operation will be described. When the fuse link 2 is blown due to a fault current in the electrical system,
The fusing indicator bar 5 projects to the left in the figure and presses the release 8 to drive it. As a result, a detection unit (not shown) including a micro switch or the like installed at the other end of the release 8 operates and an electric signal (fusing detection signal) is output.

In the device constructed as described above, in order to reliably output an electric signal to the outside when the fuse link 2 is blown, it is necessary to manage the engagement state of the blow-off indicating rod 5 and the release 8. is necessary. At this time, the normal engagement state is a state in which the fusing indicator rod 5 and the release 8 are in contact with each other, but the contact surface is located inside the release case and cannot be visually confirmed from the outside.

[0006]

In the conventional fuse blowout detecting device constructed as described above, the engagement state between the blowout indicating rod 5 and the release 8 cannot be visually confirmed from the outside. When the fuse stopper 6 is in contact with the fuse stopper 6, it is indirectly determined that the fuse stopper 6 is in the proper engagement state. However, according to this determination method, there is a possibility that the fitting state may not be in a proper engagement state, for example, when the mounting bracket 7 is deformed, so that the reliability is low.

The present invention has been made to solve the above problems, and it is possible to visually confirm the engagement state between the fusing indicator rod and the release, and to improve the reliability. It is an object of the present invention to obtain a fuse blowout detection device capable of performing the above.

[0008]

According to a first aspect of the present invention, there is provided a fuse blow detection device in which a release case is made of a translucent material.

In a fuse blowout detecting device according to a second aspect of the present invention, the release is provided with a projecting portion which projects from one end portion of the release case and engages with the tip portion of the blowout indicating rod.

[0010]

According to the first aspect of the invention, the engagement state between the fusing indicator rod and the release in the release case is visually confirmed through the release case.

According to the second aspect of the present invention, the engaging portion between the fusing indicator rod and the release is disposed outside the release case by providing the release portion with the protruding portion, and the engagement state of both is directly visually confirmed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view showing a fuse blowing detection device according to a first embodiment of the present invention, and FIG. 2 is a side view showing an enlarged main part of FIG. In the figure, reference numeral 11 denotes a cylindrical release case which is attached to the fuse holder 3 via a mounting bracket 7 and slidably holds a release 8. The release case 11 is made of a transparent material. There is. Other configurations are similar to those of the conventional example shown in FIG.

In such a device, the same operation as in the prior art is performed to detect the fusing of the fuse link 2 and output an electric signal. However, since the release case 11 is transparent, the fusing indicator bar 5 and the release 8 are connected. It is possible to always visually check the engaged state of the. Therefore, the engagement state between the fusing indicator rod 5 and the release 8 can always be kept in an appropriate state, that is, the contact state, and thereby the reliability of the device can be improved.

In the first embodiment, the release case 1 is used.
Although the whole 1 is made transparent, only the necessary part may be made transparent. Further, a semitransparent material may be used as long as the engagement state between the fusing indicator bar 5 and the release 8 can be seen through.

Example 2. Next, FIG. 3 is an enlarged side view showing a main part of a fuse blowing detection apparatus according to a second embodiment of the present invention. In the figure, 12 is a cylindrical release case that is attached to the fuse holder 3 via the mounting bracket 7, and 13 is a release that is slidably provided in the release case 12, and one end of this release 13 is shown. Is provided with a protrusion 13a that protrudes from one end of the release case 12 and contacts the tip of the fusing indicator rod 5. Other configurations are similar to those of the conventional example shown in FIG.

In such an apparatus, since the release portion 13 is provided with the protruding portion 13a, the engagement portion between the fusing indicator rod 5 and the release 13 is located outside the release case 12, and the engagement state can be directly visually confirmed. It becomes possible to do. Therefore, the reliability of the device can be improved.

In each of the above embodiments, the fuse blowout detection device mounted on the high voltage electromagnetic contactor has been described.
It may be mounted on another opening / closing device, and has the same effect as each of the above-described embodiments.

[0018]

As described above, in the fuse blowout detecting device of the first aspect of the present invention, since the release case is made of the translucent material, the engagement state between the blowout indicating rod and the release is set outside the release case. It is possible to visually confirm from the above, and thereby it is possible to improve the reliability.

In the fuse blowout detecting device of the second aspect of the present invention, since the release portion is provided with the protruding portion which projects from one end of the release case and engages with the tip end portion of the blowout indicating rod, the relationship between the blowout indicating rod and the release is provided. Since the mating portion can be located outside the release case, it is possible to directly visually check the engagement state between the fusing indicator rod and the release, thereby improving the reliability.

[Brief description of drawings]

FIG. 1 is a side view showing a fuse blowing detection device according to a first embodiment of the present invention.

FIG. 2 is a side view showing an enlarged main part of FIG.

FIG. 3 is an enlarged side view showing a main part of a fuse blowing detection device according to a second embodiment of the present invention.

FIG. 4 is a side view showing an example of a conventional fuse blowout detection device.

[Explanation of symbols]

2 fuse link, 5 fusing indicator rod, 8,13 release, 11,12 release case, 13a protruding part.

Claims (2)

[Claims] 1. A cylindrical release case, a release which is slidably accommodated in the release case, one end portion of which is engaged with a tip end portion of a fusing indicator rod which protrudes when the fuse link is blown, and the release case. In a fuse blowout detection device provided at the other end, which includes a detection unit for detecting blowout of the fuse link by driving the release,
A fuse blowout detection device, wherein the release case is made of a translucent material. 2. A tubular release case, a release which is slidably accommodated in the release case, one end of which is engaged with a tip end of a fusing indicator rod protruding when the fuse link is blown, and a release case of this release. In a fuse blowout detection device provided at the other end, which includes a detection unit for detecting blowout of the fuse link by driving the release,
The fuse blowout detection device, wherein the release is provided with a protrusion that protrudes from one end of the release case and engages with the tip of the blowout indicating rod.