JPH06260077A - Switch with fuse - Google Patents

Abstract

PURPOSE:To provide planar miniaturized switches with fuses by providing insulating barriers between power side fixed contacts and power side clips, and arranging load switches and fuses on the right and left of the insulating barriers. CONSTITUTION:Insulating support plates 1 are provided with power side clips 13 and load side clips 14 fitting or removing fuses 6 and moving blades 8 contacted with or separated from power side fixed contacts with the rotary shafts connected to the power side clips 13 adjacent to the clips used as fulcrums. Intermediate connection sections 13A, 13B are connected to the power side clips 13 between the power side clips 13 and the load side clips 14 from the rotary shafts of the moving blades 8. Insulating barriers 3 are provided between the power side fixed contacts and the power side clips 13, and load switched 5 and fuses 6 are arranged on the right and left of the insulating barriers 3. Switches with fuses easy to fit can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with a fuse in which the arrangement of a load switch and a fuse is devised.

[0002]

2. Description of the Related Art Generally, a power receiving circuit breaker has a plurality of distribution lines connected to a load side. When the load capacity of the distribution line is large, the load (motor, transformer, etc.) is passed through the circuit breaker.
When the load capacity is small, use a load switch with a fuse instead of the circuit breaker. A load switch with a fuse is composed of a load switch and a fuse on the load side.When an overcurrent or a short-circuit current flows into the load, the fuse blows out and shuts off the overcurrent. Opens to disconnect the power supply side from the load side to protect the load.

In the load switch, when the operation lever is rotated, the movable blade is rotated to come into contact with and separate from the fixed contact in the arc extinguishing chamber to electrically open and close. A fuse is attached to the load side terminal of the movable blade. Known examples of such load switches with fuses are shown in Japanese Utility Model Laid-Open No. 63-38243, in which a movable blade is arranged below the fuse, or in Japanese Utility Model Laid-Open No. 60-115447. For example, a movable blade is arranged on the back side of the paper and a fuse is arranged on the front side of the paper.

[0004]

The load switch with a fuse has the above-mentioned function, but in the known example of the former, the longitudinal direction becomes large, and in the latter, the longitudinal direction becomes thick. As a result, not only the load switch with a fuse becomes large in size, but also when the load switch is installed on the switchboard, the installation location is limited and the installation work is not easy.

An object of the present invention is to provide a load switch with a fuse which is compact and which can be easily installed in a switchboard.

[0006]

A load switch with a fuse according to the present invention has an intermediate connecting portion connected to a power supply side clip between a load drive pin side of a movable blade and a power supply side clip and a load side clip. An insulating barrier was provided between the side terminal and the power supply side clip.

[0007]

As a result, it becomes possible to arrange the load switch and the fuse in the width direction, and it becomes possible to manufacture a planar and downsized switch with a fuse for three-phase or each phase, which is mounted on the switchboard. Became easier.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a front view in which a load switch with a three-phase fuse is attached to a switchboard. 2 and 3 are views seen from the upper side, the bottom face, and the left side of FIG. 1, and FIG. 4 is a diagram showing the relationship between the load switch and the fuse. 6 to 10 are sectional views taken along the line AA and the line BB in FIG. 1 in which the load switch operates.

Each of the load switches with a three-phase fuse shown in FIG. 1 is supported by an independent insulating support plate 1. The insulating support plate 1 has a mounting metal fitting 1A mounted on the back surface and, for example, four interphase insulating barriers 2 for each phase mounted on the front surface. Mounting bracket 1
A is a load switch with a fuse mounted and supported by a bolt on the inner wall surface of the switchboard. A power supply side insulation barrier 3 and a load side insulation barrier 4 are provided on the insulation support plate 1 between the interphase insulation barriers 2. A load switch 5 and a fuse 6 are arranged on the left and right insulating support plates 1 of the power supply side insulation barrier 3 and the load side insulation barrier 4.

The load switch 5 comprises a fixed contact 7 on the power source side and a rotatable movable blade 8 which opens and closes on the fixed contact 7. The power source side fixed contactor 7 is arranged in the arc extinguishing chamber 9. One end of the arc extinguishing chamber 9 is supported by an arc extinguishing chamber support member 9A provided between the interphase insulating barrier 2 and the power source side insulating barrier 3. The arc-extinguishing chamber 9 extends in the moving direction of the movable blade 8 and forms an opening upward. Near the arc extinguishing chamber 9, a power source side terminal 10 connected to the fixed contact 7 is attached.

The arc contact at the tip of the movable blade 8 having an inverted V shape opens and closes with the fixed contact 7 on the power source side. The other end of the movable blade 8 is provided with a drive link 11 via a fixed shaft 11.
The other end of the drive link 11A is connected to the stopper 21 of the operation mechanism section 20 via the rotating shaft 11B. Therefore, when the drive lever 21 and the drive link 11A rotate according to the rotation of the insulating drive shaft 23 of the operation mechanism unit 20, the movable blade 8 opens and closes with the fixed contact 7 with the fixed shaft 11 as a fulcrum.

The power supply side clip 13 electrically connected to the drive pin 11B comprises a rising portion 13A and a horizontal portion 13B, and one end of the rising portion 13A is electrically connected to the driving pin 11B. The other end forms a rising horizontal portion 13B bent in the fuse arrangement direction, and a power supply side clip 13 connected to the other end of the horizontal portion 13B extends upward. The power supply side clip 13 adjacent to the power supply side fixed contact 7 and the arc extinguishing chamber 9 has a load side clip 14 disposed below the power supply side clip 13. The load side clip 14 is supported by the insulating support plate 1. Therefore, the fuse 6 is detachably mounted between the power supply side clip 13 and the load side clip 14.

The power supply side insulating barrier 3 provided on the power supply side between the load switch 5 and the fuse 6 connects the power supply side clip 13 to the arc generated when the movable blade 8 is opened from the fixed contact 7. It should be high enough to prevent The load-side insulation barrier 4 surrounds the load-side clip 14 between the fuse 6 and the left and right interphase insulation barriers 2 and from the right interphase insulation barrier 2 and extends to a part of the load-side terminal 15. A creepage distance is required to prevent arcs from flying from the power supply side clip side to the load side clip side. Load side terminal 15
Is connected to the load side clip 14.

As described above, according to the switch with a three-phase fuse of the present invention, the intermediate connecting portions 13A and 13B are connected to the power supply side clip 13 from the middle of the fuse 6 in the longitudinal direction from the rotating shaft 11B side. 6, the load switch 5 is arranged adjacent to the power switch 6, and an arc generated when the movable blade 8 is opened from the power source side fixed contact 7 is prevented by the power source side insulating barrier 3;
Since the arc is prevented from being applied to the clip 13 on the power source side, it becomes possible to manufacture a planar three-phase or each-phase fuse-equipped switch in which the load switch 5 and the fuse 6 are arranged in the width direction.

Therefore, even if the planar switch with a three-phase fuse is mounted on, for example, a switchboard, the thickness of the switch with a three-phase fuse is not increased, and the mounting at the mounting location is facilitated. Further, the load switch 5 and the fuse 6 are arranged on the left and right sides through the power-source side insulating barrier 3, which is easy to see and can be installed from the exposed front surface, so that the work is easy and
There is an advantage that the work status can be seen immediately.

When the fuse 6 is blown, a potential is applied to the power supply side clip 13 via the load switch 5, and an arc is generated from the power supply side clip 13 to the load side clip 1.
When discharging to 4, the arc is blocked by the load side insulating barrier 4, so that the load side is safe.

The interphase insulating barrier 2 has a recess 17 and a protrusion 18 on the upper end surface and the lower end surface thereof. The protruding portion 18 is arranged in the accommodation groove 18A provided in the insulating support plate 1.
Since the protrusions 18 are fitted into the recesses 17 and the load switch 1 with fuses of a single phase or a plurality of phases can be stacked and transported, not only the transport efficiency is good, but also with a plurality of stacked fuses. Since the load switch has only to be packaged once, packaging is easier.

In the fuse 6 inserted between the clips, a fuse element is arranged in the insulating cylinder, and when the fuse element is blown, the elastic member in the insulating cylinder, such as a spring, causes the fuse rod to pop out of the insulating cylinder. When the arc contact of the movable blade 8 is separated from the fixed contact 7 on the power source side and electrically cut off by releasing the input / holding state of the operation mechanism unit 20, the switch with fuse is flat and easy to see.

Next, the operating mechanism section 20 includes the interphase insulating barrier 2
It is configured as follows by penetrating through the through hole 23A provided in the.

That is, the operating lever 22 provided on the outer side of the interphase insulating barrier 2 on one side is rotated clockwise or counterclockwise and fixed to the insulating drive shaft 23. The insulated drive shaft 23 is inserted into the through hole 23A, and the drive lever 21 and the drive link 11A are fixed to the insulated drive shaft 23. The drive link 11A is composed of a conductive member. Since the drive link 24 and the other end of the movable blade 8 are rotatably supported by the fixed shaft 11, the movable blade 8 rotates about the fixed shaft 11 as a fulcrum.

Therefore, when the movable blade 8 is put into the fixed contact 7 on the power source side, the insulating drive shaft 23 and the drive link are rotated by rotating the operation lever 22 in the clockwise direction, for example.
11A and the drive lever 21 rotate in the same direction, the movable blade 8 rotates in the direction X1 of the arrow, that is, counterclockwise with the fixed shaft 11 as a fulcrum, and the arc contactor of the movable blade 8 enters the fixed contactor 7. .

In this case, the blocking spring 25 provided on a part of the insulating support plate 1 and the movable blade 8 accumulates the stretching energy stretched during the rotation of the movable blade 8, and the accumulated energy is stored. Holds the stored energy and the applied state in a state where the concave portion 26 of the operating lever 22 is inserted into the convex portion 28 of the holding hook 27. Further, one end of the pull-out lever 29 pushes one end of the pull-out lever 29 downward via the pull-out shaft, and the other end of the pull-out lever 29 also pushes the striker pin of the fuse 4 through the pull-out shaft. 30 is pressed lightly.

To release the closed state, the operating lever 2
2 is rotated clockwise to release the engagement between the concave portion 26 of the operating lever 22 and the convex portion 28 of the holding hook 27, the movable blade 6 rotates in the arrow direction X2, and the arc contactor of the movable blade 8 moves. It is separated from the fixed contact 7 on the power source side and electrically cut off.

When the arc contact of the movable blade 8 is in contact with the fixed contact 7 and a fuse 6 melts down due to a short circuit accident or overcurrent, the striker pin 30 pops out from the insulating cylinder of the fuse 6. Then, one end of the pull-out lever 29 is pressed to release the engagement between the concave portion 26 of the operating lever 22 and the convex portion 28 of the holding hook 27, the accumulated energy of the cutoff spring 25 is released, and the arc contactor of the movable blade 8 is released. Is separated from the fixed contactor 7 and electrically cut off.

In this embodiment, the current of the movable blade 8 is passed through the drive link 11A and the drive pin 11B to the fuse 6 and a part of the operation mechanism portion 20 is used as a current path, so that the current path can be shortened. Further, since the fixed shaft 11 is provided on the power source side fixed contactor 7 side apart from the insulating drive shaft 23, the movable blade 6 can be shortened by this amount, the turning force of the movable blade 6 can be reduced, and the load opening / closing with a fuse can be performed. You can now shrink the vessel. Further, an insulating ring 31 is provided between the insulating drive shafts 23 to reduce the width of the insulating drive shaft 23.

[0026]

According to the present invention, the intermediate connecting portion is connected to the power supply side clip from between the rotating shaft side of the movable blade and the power supply side clip and the load side clip, and the power supply side fixed contactor and the power supply side clip are connected. Since an insulating barrier is provided between the load barrier and the load switch on both sides of the insulator barrier, it becomes possible to manufacture a flat load switch with a fuse.
Since the installation work can be done from the exposed front surface, it is easy to work and has the advantage that the work status can be seen immediately.

[Brief description of drawings]

FIG. 1 is a front view of a load switch with a fuse, which is an embodiment of the present invention, as viewed from the front.

FIG. 2 is an upper side view of FIG. 1 when viewed from above.

FIG. 3 is a view of FIG. 1 when viewed from the back side.

FIG. 4 is a perspective view of the operation mechanism section of FIG. 1.

5 is a right side view of FIG.

6 is a side sectional view taken along the line AA in FIG.

FIG. 7 is a side sectional view taken along the line BB in FIG.

FIG. 8 is a side cross-sectional view taken along the line BB of FIG.

9 is a side cross-sectional view taken along the line BB of FIG.

10 is a side sectional view taken along the line BB in FIG.

[Explanation of symbols]

1 ... Insulating support plate, 2 ... Interphase insulating barrier, 3 ... Switch, 4
... Fuse, 6 ... Movable blade, 11 ... Load side terminal, 1
5, 16 ... Insulation barrier, 20 ... Operating mechanism section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadao Izumi 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Inside Kokubun factory, Hitachi, Ltd. (72) Inventor Masakatsu Hirano 1-1-15, Kanazawa-machi, Hitachi-shi, Ibaraki No. 25 In stock Hitachi Electric Systems Co., Ltd. (72) Inventor Akira Osaka 1-1 1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture In the Kokubun Plant, Hitachi, Ltd. (72) Inventor Kotaro Takematsu 1 Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 inside the Kokubun Plant of Hitachi, Ltd.

Claims (10)

[Claims] 1. An insulating support plate, a power supply side clip for attaching and detaching a fuse attached to the insulating support plate and a load side clip, a rotating shaft side for connecting to the power supply side clip adjacent to these clips, and a rotating shaft side. And a movable blade that contacts and separates from the fixed contact on the power supply side as a fulcrum, and connects the intermediate connection part to the clip on the power supply side between the clip on the power supply side and the clip on the load side from the rotary shaft side to fix the fixed contact on the power supply side. A switch with a fuse, characterized in that an insulating barrier is provided between the child and the clip on the power supply side. 2. An insulating support plate, a power supply side clip and a load side clip for attaching and detaching a fuse attached to the insulating support plate, a rotating shaft side for connecting to the power supply side clip adjacent to these clips, and a rotating shaft side. A movable blade that contacts and separates from the power supply side fixed contactor with the fulcrum as a fulcrum, and a movable blade that contacts and separates from the power supply side fixed contactor with the rotating shaft side as a fulcrum, and the power supply side clip from the rotating shaft side. Between the power supply side clip and the load side clip, connect the intermediate connection part to the power supply side clip, provide an insulating barrier between the power supply side terminal and the power supply side clip, and close the power supply side clip to the corresponding load side clip. A switch with a fuse, which is equipped with a load side insulation barrier that blocks arcs from the side. 3. An insulating support plate, a power supply side clip and a load side clip for attaching and detaching a fuse attached to the insulating support plate, a rotating shaft side for connecting to the power supply side clip adjacent to these clips, and a rotating shaft side. A movable blade that contacts and separates from the power supply side fixed contactor with the fulcrum as a fulcrum, and a movable blade that contacts and separates from the power supply side fixed contactor with the rotating shaft side as a fulcrum, and the power supply side clip from the rotating shaft side. Connect the intermediate connection part to the power supply side clip from between the load side clip and the load side clip, provide an insulating barrier between the power supply side terminal and the power supply side clip, and rotate the movable blade with one end as the fulcrum on the rotary shaft side. The operating mechanism part that rotates rotates in the same direction as the operating lever, the insulating drive shaft supported by the insulating plate that rotates according to the rotation of the operating lever, and the insulating drive shaft supported by the insulating drive shaft. And,
A drive link that rotates a movable blade fixed via a drive pin, a cutoff spring that stores energy when the movable blade rotates in a closing direction, and a holding hook that engages with an operation lever that holds the stored energy. A switch with a fuse, which is provided with. 4. A switch with a fuse according to claim 1, wherein fuses are arranged in the power supply side clip and the load side clip. 5. A fuse is arranged on the power supply side clip and the load side clip, and a striker pine of the fuse is arranged on the power supply side.
Switch with fuse according to paragraph. 6. An operating mechanism section for opening and closing the switch, an operating lever of the operation mechanism section and a holding hook are engaged with each other to maintain the switch on-state, and the striker pin pops out when the fuse is blown. 4. The switch with a fuse according to claim 3, wherein a breaking lever provided on the fuse is rotated to release the closed state. 7. The insulation drive shaft is rotated in the same direction as the insulation drive shaft, and a part of the operating mechanism of the switch is connected to the power supply side terminal of the fuse. Switch with fuse. 8. A switch with a fuse according to claim 3, wherein a fixed shaft for supporting the movable blade and the drive link is provided near the insulated drive shaft. 9. The switch with a fuse according to claim 3, wherein the insulating drive shaft is provided with an insulating ring between the phases. 10. A striker pin of a fuse which engages with a breaking lever is arranged on a power source side, an operating lever and a holding hook engage with each other to hold a switch on state, and when the fuse blows, the striker pin is released. The switch with a fuse according to claim 3, wherein the switch is opened to release the closed state by rotating a breaking lever provided on the fuse.