JPH07226132A - Manual operation mechanism for circuit breaker - Google Patents
Manual operation mechanism for circuit breakerInfo
- Publication number
- JPH07226132A JPH07226132A JP1564994A JP1564994A JPH07226132A JP H07226132 A JPH07226132 A JP H07226132A JP 1564994 A JP1564994 A JP 1564994A JP 1564994 A JP1564994 A JP 1564994A JP H07226132 A JPH07226132 A JP H07226132A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- circuit breaker
- manual operation
- opening
- button
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Breakers (AREA)
- Switch Cases, Indication, And Locking (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、受配電系統などに使用
される遮断器に係り、特に、この遮断器を手動で入・切
する遮断器の手動操作機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker used in a power distribution system or the like, and more particularly to a manual operation mechanism for a circuit breaker for manually turning on / off the circuit breaker.
【０００２】[0002]
【従来の技術】受配電系統の保護機器として用いられる
遮断器の開閉操作は、通常、中央制御室等からの遠方操
作が一般的である。しかし、この遠方操作系統が不具合
時の緊急対応、及び、保守点検時の調整作業のため、一
般的に、遮断器の前面の表面板部には、手動開閉ボタン
が設けられている。2. Description of the Related Art Normally, a circuit breaker used as a protective device for a power distribution system is opened and closed by a remote operation from a central control room or the like. However, a manual open / close button is generally provided on the front surface plate portion of the circuit breaker for emergency response when the remote operation system malfunctions and for adjustment work during maintenance and inspection.
【０００３】図４は、従来の電動ばね操作形遮断器の表
面板の構成の例を示す正面図である。図４において、遮
断器の前面板には、手動閉路ボタン14と手動開路ボタン
15が隣設して設けられているとともに、遮断器の開閉状
態を表示する「入切」インジケータ16、及び、閉路操作
に必要な図示しない投入ばねが蓄勢状態か放勢状態かを
示す「放蓄」インジケータ17などが設けられている。FIG. 4 is a front view showing an example of the construction of a face plate of a conventional electric spring operated type circuit breaker. In FIG. 4, a manual circuit closing button 14 and a manual circuit opening button are provided on the front plate of the circuit breaker.
15 is provided adjacently, and an "on / off" indicator 16 for displaying the open / closed state of the circuit breaker, and a closing spring (not shown) necessary for closing operation to indicate whether the spring is in a stored state or a released state. A "storage" indicator 17 and the like are provided.
【０００４】このように、手動操作ボタンは、定常状態
の運転状態における遠方操作では、使用されないため、
通常、人為的誤操作を防ぐために、鎖錠状態にして使用
される場合が多い。As described above, since the manual operation button is not used in the remote operation in the steady operating state,
Usually, in order to prevent human error, it is often used in a locked state.
【０００５】手動操作ボタンの鎖錠方法としては、従来
の鎖錠機構を示す図５（ａ）に示すように、手動操作ボ
タン用窓18の前面に邪魔板19をねじ止めにより固定する
方法、及び、図５（ｂ）に示すように、邪魔板19の一端
と、遮断器操作機構内のプレート20を、南京錠21で結合
して鎖錠する、いわゆる、パッドロック方式などがあ
る。As a method of locking the manual operation button, as shown in FIG. 5 (a) showing a conventional locking mechanism, a baffle plate 19 is fixed to the front surface of the window 18 for the manual operation button by screwing, Further, as shown in FIG. 5 (b), there is a so-called padlock system in which one end of the baffle plate 19 and the plate 20 in the circuit breaker operating mechanism are joined and locked by a padlock 21.
【０００６】[0006]
【発明が解決しようとする課題】従来、手動操作ボタン
の鎖錠方法として採用されているねじ止め方式は、簡素
な構成ではあるものの、保守員以外の第３者によって、
容易に鎖錠状態を解除されるおそれがある。The screwing method conventionally used as a method for locking a manual operation button has a simple structure, but a third person other than a maintenance person can
The locked state may be easily released.
【０００７】また、パッドロック方式の鎖錠状態を解除
するために、鍵を使用する方法は、受配電設備の運営
上、他にも種々の鍵があるため、その使用管理が煩雑に
なるとともに、鍵による鎖錠解除作業は、実際の作業者
以外の第３者に明確にならず、作業者自身の思い違い
や、個人の判断ミスによる誤操作が防ぎきれないおそれ
もある。そこで、本発明の目的は、誤操作のおそれを減
らすことのできる遮断器の手動操作機構を得ることであ
る。In addition, the method of using a key to release the lock state of the padlock system makes various use of other keys in the operation of the power receiving and distribution equipment, which makes the use management complicated. The unlocking work by the key is not clear to a third person other than the actual worker, and there is a possibility that the operator's misunderstanding and an erroneous operation due to an individual judgment error cannot be prevented. Then, the objective of this invention is to obtain the manual operation mechanism of the circuit breaker which can reduce the risk of erroneous operation.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載の発明
は、遮断器の前面板に形成された開口部に設けられた案
内部を介して前面板と平行に移動自在に設けられ復帰ス
プリングの復帰により開口部を封止する邪魔板と、先端
が案内部に遊嵌されて邪魔板を開口部から移動させる解
錠板を備えてなる遮断器の手動操作機構である。According to a first aspect of the present invention, a return spring is provided movably in parallel with a front plate through a guide portion provided in an opening formed in the front plate of a circuit breaker. Is a manual operation mechanism of a circuit breaker including a baffle plate that seals the opening by the return of the lock and an unlocking plate whose tip is loosely fitted in the guide portion to move the baffle plate from the opening.
【０００９】また、請求項２に記載の発明は、遮断器の
前面板に隣接形成された一対の開口部に設けられた案内
部を介して前面板と平行に移動自在に設けられ復帰スプ
リングの復帰により開口部を封止する邪魔板と、手動操
作穴が形成された先端が案内部に遊嵌されて邪魔板を開
口部から移動させる略Ｔ字形の解錠板を備えてなる遮断
器の手動操作機構である。According to the second aspect of the invention, the return spring is provided so as to be movable in parallel with the front plate through guide portions provided in a pair of openings formed adjacent to the front plate of the circuit breaker. A circuit breaker including a baffle plate that seals the opening upon return and a substantially T-shaped unlocking plate that moves the baffle plate from the opening by loosely fitting the tip with the manual operation hole formed in the guide part. It is a manual operation mechanism.
【００１０】[0010]
【作用】請求項１に記載の発明においては、前面板の案
内部に先端が遊嵌される解錠板によって、邪魔板は解錠
される。また、請求項２に記載の発明においては、前面
板の案内部に先端が遊嵌される解錠板によって、邪魔板
は解錠され、遮断器の手動操作部は、解錠板の先端の手
動操作穴から操作される。According to the first aspect of the invention, the baffle plate is unlocked by the unlocking plate whose tip is loosely fitted in the guide portion of the front plate. Further, in the invention according to claim 2, the baffle plate is unlocked by the unlocking plate whose tip is loosely fitted to the guide portion of the front plate, and the manual operation part of the circuit breaker is mounted on the tip of the unlocking plate. It is operated from the manual operation hole.
【００１１】[0011]
【実施例】図１は、本発明の遮断器手動操作機構の一実
施例を示す図で、このうち、（ｂ）は正面図、（ａ）は
（ｂ）の右側面図、（ｃ）は（ａ）のＡ−Ａ断面図であ
る。なお、図１は、開路ボタンと閉路ボタンが操作不能
に鎖錠されているときを示す。1 is a view showing an embodiment of a manual operation mechanism for a circuit breaker of the present invention, in which (b) is a front view, (a) is a right side view of (b), and (c). FIG. 7A is a sectional view taken along line AA of FIG. Note that FIG. 1 shows a case where the open button and the close button are locked so that they cannot be operated.
【００１２】図１（ａ），（ｂ），（ｃ）において、表
面板１には、長方形の開路ボタン用穴３Ａとこの開路ボ
タン用穴と同一外形の閉路ボタン用穴３Ｂが上下に隣接
して形成されている。また、表面板１の表面側には、図
１（ａ）において略凸字状に折曲形成されたベース板６
が取り付けられ、このベース板６には、開路ボタン用穴
３Ａと閉路ボタン用穴３Ｂの前方の位置にガイド用穴９
がそれぞれ形成されている。1 (a), 1 (b) and 1 (c), a rectangular opening button hole 3A and a closing button hole 3B having the same outer shape as the opening button hole are vertically adjacent to each other on the surface plate 1. Is formed. In addition, on the front surface side of the surface plate 1, a base plate 6 bent and formed in a substantially convex shape in FIG.
Is attached to the base plate 6, and a guide hole 9 is provided at a position in front of the open button hole 3A and the close button hole 3B.
Are formed respectively.
【００１３】ベース板６には、上方のガイド用穴９の上
方に、図１（ａ）では略Ｚ字状に形成された案内板11Ａ
がスポット溶接され、同じく下方のガイド用穴９の下方
にも案内板11Ａが対称的にスポット溶接されている。さ
らに、開路ボタン用穴３Ａと閉路ボタン用穴３Ｂの間に
は、略Ｌ字形に折曲された一対の案内板Ｂが取り付けら
れている。A guide plate 11A formed in the base plate 6 above the upper guide hole 9 is formed in a substantially Z shape in FIG. 1 (a).
Is also spot-welded, and the guide plate 11A is also symmetrically spot-welded below the lower guide hole 9. Further, between the opening button hole 3A and the closing button hole 3B, a pair of guide plates B bent in a substantially L shape are attached.
【００１４】また、ベース板６の裏面の左方には、図１
（ｃ）に示すように、略Ｗ字状に折曲された邪魔板案内
板５が小ねじで縦に取り付けられている。さらに、上下
のガイド用穴９には、図１（ｂ）の右端上下に、図１
（ａ）において略ｈ字状の折曲部10が形成された邪魔板
８が、折曲部10をガイド用穴９の上下に遊嵌させて取り
付けられている。この邪魔板８の右端の上下には、復帰
スプリング７の左端が係止され、この復帰スプリングの
右端は、ベース板６の右端に詳細省略したＬ字形の固定
金具に係止されている。さらに、ベース板６には、開路
ボタン用穴３Ａの左側に銘板“開路ボタン”が、閉路ボ
タン用穴３Ｂの左側に“閉路ボタン”が、図１（ｂ）に
示すようにそれぞれ取り付けられている。On the left side of the back surface of the base plate 6, FIG.
As shown in (c), the baffle guide plate 5 bent into a substantially W shape is vertically attached with machine screws. Further, in the upper and lower guide holes 9, the upper and lower right ends of FIG.
The baffle plate 8 in which the substantially h-shaped bent portion 10 is formed in (a) is attached by loosely fitting the bent portion 10 above and below the guide hole 9. The left end of the return spring 7 is locked above and below the right end of the baffle plate 8, and the right end of the return spring is locked to the right end of the base plate 6 by an L-shaped fixing metal fitting not shown in detail. Further, on the base plate 6, a nameplate "opening button" is attached to the left side of the opening button hole 3A, and a "closing button" is attached to the left side of the closing button hole 3B as shown in FIG. 1 (b). There is.
【００１５】このように構成された遮断器手動操作機構
において、例えば、邪魔板８による鎖錠を解除する場合
には、図２（ａ）に示すように、開路ボタン用窓３Ａと
閉路ボタン用窓３Ｂと同等の大きさの穴が設けられた大
型解除プレート12をガイドプレート11Ａ，11Ｂの間に図
１（ｂ）において右側から挿入することにより、邪魔板
８を左方に押して開路ボタン用窓３Ａと閉路ボタン用窓
３Ｂを図３（ｂ）に示すように開く。In the circuit breaker manual operation mechanism constructed as described above, for example, when the lock by the baffle plate 8 is released, as shown in FIG. 2A, the open button window 3A and the close button are used. By inserting a large-sized release plate 12 provided with a hole having the same size as the window 3B from between the guide plates 11A and 11B from the right side in FIG. 1 (b), the baffle plate 8 is pushed to the left and used for the opening button. The window 3A and the closing button window 3B are opened as shown in FIG. 3 (b).
【００１６】したがって、このように構成された遮断器
操作機構においては、通常の運転状態では、図１に示す
状態となって、復帰ばね７の作用により、上下の邪魔板
８は、開路ボタン４及び閉路ボタン２の少なくともどち
らか一方を覆い手動開閉操作が不可能となる。また、ガ
イドプレート11Ａ，11B によって、邪魔板８の折り曲げ
部10も、表面側から覆われているため、手動では、邪魔
板８を開くことはできず、常に開路ボタン４と閉路ボタ
ン２は鎖錠された状態となる。Therefore, in the circuit breaker operating mechanism thus constructed, in the normal operating state, the state shown in FIG. 1 is obtained, and the action of the return spring 7 causes the upper and lower baffle plates 8 to open. And, at least one of the circuit closing button 2 is covered, and the manual opening / closing operation becomes impossible. Further, since the bent portion 10 of the baffle plate 8 is also covered from the front side by the guide plates 11A and 11B, the baffle plate 8 cannot be opened manually, and the open button 4 and the close button 2 are always chained. It will be locked.
【００１７】これらの開路ボタン４と閉路ボタン２の鎖
錠状態を解除するためには、図２に示す如く大形の解除
プレート12をガイドプレート11Ａ，11B の間に右側から
挿入することにより、解除プレート12は、邪魔板８の折
り曲げ部10の右端面を押し、復帰ばね７の復帰力に反し
て、邪魔板８を開く。この邪魔板８が開き終わった位置
で、解除プレート12に設けた角穴13と、表面板１の閉路
ボタン用窓３Ａと開路ボタン用窓３Ｂの位置が一致し、
図３に示すように、前方からの手動による押しボタン操
作が可能となる。In order to release the locked state of the open button 4 and the close button 2, a large release plate 12 is inserted between the guide plates 11A and 11B from the right side as shown in FIG. The release plate 12 pushes the right end surface of the bent portion 10 of the baffle plate 8 and opens the baffle plate 8 against the restoring force of the return spring 7. At the position where the baffle plate 8 has finished opening, the positions of the rectangular hole 13 provided in the release plate 12, the closing button window 3A and the opening button window 3B of the front plate 1 match,
As shown in FIG. 3, the push button operation can be manually performed from the front side.
【００１８】また、開路ボタン３Ａと閉路ボタン３Ｂの
鎖錠状態を解錠するときには、大形の解除プレート12の
形状がＴ形となっているので、片方の押しボタン用窓を
開ける操作と同時に、他方の押しボタン用窓を開く操作
はできないので、閉路ボタン２と開路ボタン４の同時操
作はできない。このように、通常は邪魔板８により、手
動開閉操作ができないので、手動操作ボタンは鎖錠され
る。Further, when the open state button 3A and the close state button 3B are unlocked, since the large release plate 12 has a T-shape, at the same time when one push button window is opened. Since the other push button window cannot be opened, the closing button 2 and the opening button 4 cannot be operated simultaneously. In this way, normally, the manual operation button is locked because the manual opening / closing operation cannot be performed by the baffle plate 8.
【００１９】このように構成された遮断器操作機構にお
いては、簡単な構造で、第３者が鎖錠状態を解除するこ
とができず、鎖錠を解除するためには、解除プレートを
管理している特定の作業者に限られることとなる。した
がって、管理・運用面において、高い信頼性が得られ
る。In the circuit breaker operating mechanism constructed in this manner, the third party cannot release the locked state with a simple structure, and in order to release the locked state, the release plate is managed. It will be limited to a specific worker. Therefore, high reliability can be obtained in terms of management and operation.
【００２０】さらに、鎖錠解除作業には、鍵のように、
一般的に種々の鎖錠に使用される小物を使用することな
く、特定の大形の解除プレートを使用するため、作業者
のみならず、第３者がその実施される作業内容を事前に
判断できるので、作業者自身の思い違い等による誤操作
を未然に防ぐことができる。また、上述のとおり、開路
と閉路は、同時に鎖錠を解除できない構成であるため、
さらに操作上の信頼性も向上する。Further, for unlocking work, like a key,
Since a specific large-sized release plate is used without using small items that are generally used for various locks, not only the worker but also a third party can judge the work contents to be performed in advance. Therefore, it is possible to prevent erroneous operations due to misunderstandings of the operator himself. Further, as described above, since the open circuit and the closed circuit cannot be unlocked at the same time,
In addition, operational reliability is improved.
【００２１】なお、上記実施例においては、邪魔板８
は、水平に設けられた案内板11によって水平に移動させ
た場合で説明したが、遮断器の前面板に取り付けられた
他の器具の配置によっては、上下に移動させるようにし
てもよい。すなわち、解除板12を上から挿入するように
してもよく、また、下から上方に挿入するようにしても
よい。In the above embodiment, the baffle plate 8
In the above description, the guide plate 11 provided horizontally is used for horizontal movement, but the guide plate 11 may be moved vertically depending on the arrangement of other devices attached to the front plate of the circuit breaker. That is, the release plate 12 may be inserted from above or from below to above.
【００２２】[0022]
【発明の効果】以上、請求項１に記載の発明によれば、
遮断器の前面板に形成された開口部に設けられた案内部
を介して前面板と平行に移動自在に設けられ復帰スプリ
ングの復帰により開口部を封止する邪魔板と、先端が案
内部に遊嵌されて邪魔板を開口部から移動させる解錠板
を備えてなる遮断器の手動操作機構に具備することで、
前面板の案内部に先端が遊嵌させる解錠板によって、邪
魔板を解錠したので、誤操作のおそれを減らすことので
きる遮断器の手動操作機構を得ることができる。As described above, according to the invention of claim 1,
A baffle plate which is provided movably in parallel with the front plate through a guide part provided in the opening formed in the front plate of the circuit breaker and seals the opening by the return spring, and the tip serves as the guide part. By providing a manually operated mechanism for a circuit breaker that includes an unlocking plate that is loosely fitted to move the baffle plate from the opening,
Since the baffle plate is unlocked by the unlocking plate whose tip is loosely fitted to the guide portion of the front plate, it is possible to obtain the manual operation mechanism of the circuit breaker that can reduce the risk of erroneous operation.
【００２３】また、請求項２に記載の発明によれば、遮
断器の前面板に隣接形成された一対の開口部に設けられ
た案内部を介して前面板と平行に移動自在に設けられ復
帰スプリングの復帰により開口部を封止する邪魔板と、
手動操作穴が形成された先端が案内部に遊嵌されて邪魔
板を開口部から移動させる略Ｔ字形の解錠板を備えてな
る遮断器の手動操作機構に具備することで、前面板の案
内部に先端が遊嵌させる解錠板によって、邪魔板を解錠
し、遮断器の手動操作部を、解錠板の先端の手動操作穴
から操作したので、誤操作のおそれを減らすことのでき
る遮断器の手動操作機構を得ることができる。According to the second aspect of the invention, the return is provided so as to be movable in parallel with the front plate through guide portions provided in a pair of openings formed adjacent to the front plate of the circuit breaker. A baffle that seals the opening by the return of the spring,
By equipping the manual operation mechanism of the circuit breaker, which has a substantially T-shaped unlocking plate for moving the baffle plate from the opening, the tip having the manual operation hole formed therein is loosely fitted to the guide portion, and thus the front plate of the front plate is provided. Since the baffle plate is unlocked by the unlocking plate whose tip is loosely fitted to the guide part, and the manual operation part of the circuit breaker is operated from the manual operation hole at the tip of the unlocking plate, the risk of erroneous operation can be reduced. A manual operation mechanism for the circuit breaker can be obtained.
【図１】本発明の遮断器の手動操作機構の一実施例の鍵
を除く図で、（ａ）は、右側面図、（ｂ）は正面図、
（ｃ）は（ｂ）のＡ−Ａ断面図。FIG. 1 is a view excluding a key of an embodiment of a manual operation mechanism for a circuit breaker according to the present invention, in which (a) is a right side view and (b) is a front view.
(C) is an AA sectional view of (b).
【図２】本発明の遮断器の手動操作機構の一実施例の鍵
を含む正面図。FIG. 2 is a front view including a key of an embodiment of a manual operation mechanism for a circuit breaker according to the present invention.
【図３】本発明の遮断器の手動操作機構の作用を示す図
で、鍵が挿入された状態を示す正面図。FIG. 3 is a view showing the operation of the manual operation mechanism of the circuit breaker of the present invention, and is a front view showing a state in which a key is inserted.
【図４】従来の遮断器の手動操作機構の取付状態を示す
正面図。FIG. 4 is a front view showing a mounted state of a conventional manual operation mechanism for a circuit breaker.
【図５】（ａ）は、従来の遮断器の手動操作機構の一例
を示す部分正面図、（ｂ）は、従来の遮断器の手動操作
機構の（ａ）と異なる一例を示す部分正面図。FIG. 5A is a partial front view showing an example of a conventional manual operation mechanism for a circuit breaker, and FIG. 5B is a partial front view showing an example different from the conventional manual operation mechanism for a circuit breaker. .
【符号の説明】 １…表面板、２…閉路ボタン、３Ａ…開路ボタン用穴、
３Ｂ…閉路ボタン用穴、４…開路ボタン、５…邪魔板案
内板、６…ベース板、７…復帰スプリング、８…邪魔
板、９…ガイド用穴、10…折曲部。[Explanation of Codes] 1 ... Front plate, 2 ... Closure button, 3A ... Opening button hole,
3B ... Closing button hole, 4 ... Opening button, 5 ... Baffle plate guide plate, 6 ... Base plate, 7 ... Return spring, 8 ... Baffle plate, 9 ... Guide hole, 10 ... Bent portion.
Claims (2)
けられた案内部を介して前記前面板と平行に移動自在に
設けられ復帰スプリングの復帰により前記開口部を封止
する邪魔板と、先端が前記案内部に遊嵌されて前記邪魔
板を前記開口部から移動させる解錠板を備えてなる遮断
器の手動操作機構。1. A baffle plate movably provided in parallel with the front plate through a guide portion provided in an opening formed in the front plate of the circuit breaker and sealing the opening by return of a return spring. And a manual operation mechanism for a circuit breaker, which comprises an unlocking plate whose tip is loosely fitted to the guide portion to move the baffle plate from the opening.
開口部に設けられた案内部を介して前記前面板と平行に
移動自在に設けられ復帰スプリングの復帰により前記開
口部を封止する邪魔板と、手動操作穴が形成された先端
が前記案内部に遊嵌されて前記邪魔板を前記開口部から
移動させる略Ｔ字形の解錠板を備えてなる遮断器の手動
操作機構。2. The opening is sealed by the return of a return spring that is movably provided in parallel with the front plate through guide portions provided in a pair of openings formed adjacent to the front plate of the circuit breaker. A manual operation mechanism of a circuit breaker comprising a baffle plate and a substantially T-shaped unlocking plate for moving the baffle plate from the opening by loosely fitting a tip having a manual operation hole formed therein to the guide portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01564994A JP3678369B2 (en) | 1994-02-10 | 1994-02-10 | Circuit breaker manual operation mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01564994A JP3678369B2 (en) | 1994-02-10 | 1994-02-10 | Circuit breaker manual operation mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07226132A true JPH07226132A (en) | 1995-08-22 |
| JP3678369B2 JP3678369B2 (en) | 2005-08-03 |
Family
ID=11894571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01564994A Expired - Fee Related JP3678369B2 (en) | 1994-02-10 | 1994-02-10 | Circuit breaker manual operation mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3678369B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007188705A (en) * | 2006-01-12 | 2007-07-26 | Hitachi Ltd | Operating unit of circuit breaker |
-
1994
- 1994-02-10 JP JP01564994A patent/JP3678369B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007188705A (en) * | 2006-01-12 | 2007-07-26 | Hitachi Ltd | Operating unit of circuit breaker |
| JP4677347B2 (en) * | 2006-01-12 | 2011-04-27 | 株式会社日立製作所 | Circuit breaker actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3678369B2 (en) | 2005-08-03 |
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