201044727 六、發明說明： 【發明所屬之技術領域】 本發明係有關一種由例如匯流條（bus bar)等第一導 體、供電母線等第二導體、以及連接這些第一導體與第二 導體之連接治具所構成之連接裝置及具備使用該連接裝置 的斷路器或開閉器之配電盤。 【先前技術】 構成習知的連接裝置之板狀的匯流條與板狀的供電母 線之連接例如，係將設置有第一貫穿孔的匯流條的端部與 设置有第二貫穿孔的供電母線的端部予以相對向重疊，將 六角螺栓穿通於該等第—貫穿孔與第二貫穿孔，並將六角 螺帽螺緊於六角螺栓的穿通端。此外，為了降低重疊時的 接觸電阻，係於彼此接觸賴流條的端部與供電母線的端 部施予鐘銀處理。 對於匯流條和供電母線的錢覆處理的作業性，由於必 須將屬於重量物之匯流條和供電母線浸潰於料液並予以 ==條和供電母線的搬送性並不容易。為了避 經鐘銀處理的遠小於匯流條和供電母線之帶 ^ 筒形狀的接觸構件之物的手段。該手段為-種連接;置圓 =於開孔於匯流條的端部的第一貫穿孔壓入第 纽的孔徑相等的外徑之圓筒形㈣接觸構件有 弟二貫穿孔的供電母線的端部 1置有 的相對面，將六角螺栓穿通於^接觸構件的套圈部 逍方，逑接觸構件(圓筒形狀)的 321332 4 201044727 ▲貝牙孔舁第一貝牙孔，將六角螺帽螺緊於六角螺栓的穿通 端（參照例如專利文獻1 )。 專利文獻1 :日本實開平6_54217號公報 【發明内容】 (發明所欲解決之課題） 在使用有以往帶有套圈部的接觸構件之連接裝置 中，有下述課題：由於接觸構件的套圈部失於匯流條和供 〇電母線之間’因此電流集中流通於接觸構件的套圈部，且 '由於在該套圈部週邊產生間隙’因此容易產生電暈(corona) 放電等而發熱。 本發明的目的係解決上述課題，以獲得一種接觸電阻 低且不會產生放電之連接裝置及使用該連接裝置之配電 盤。 (解決課題的手段） 本發明的連接裝置係由第一導體、第二導體、第三導 C)體、以及安裝具所構成；該第一導體係於端部具有第一貫 穿孔；該第二導體係於端部具有第二貫穿孔；該第三導體 係具有第三貫穿孔，並經過鍍覆處理；該安裝具係貫穿前 述第-貫穿孔、第三貫穿孔、以及第二貫穿孔，並以前述 第一導體及第二導體緊固前述第三導體；由前述安裝具緊 固的前述第一導體與第三導體之相對向的面係整面接觸， 剷述第二導體的寬度為前述第一導體的寬度以上。 (發明之效果） 上述方式構成的連接裝置，由於將經過鍍覆處理的第 321332 5 201044727 二導體夹住在第一導體與第二導體之間並緊固，因此能降 低接觸電阻，且由於將前述第三導體的寬度作成前述第一 導體的寬度以上，因此不會在前述第一導體與前述第二導 體之間存在間隙’故不會產生放電。 【實施方式】 實施形態一 以下’根據附圖詳細說明本發明的實施形態一。第i 圖係構成本發明實施形態一的連接裝置之第一導體的端部 的俯視圖與剖面圖。第2圖係第二導體的端部的俯視圖與 =面圖。帛3圖係第三導體的俯視圖與剖面圖。第4圖係 貝知形心的連接裝置的連接部週邊的俯視圖與剖面圖。 此外，圖中相同符號係表示相同或相等的部分。 如第1圖所示，構成實施形態一的連接裝置之第一導 體1係長純狀的純，且於朗部的板厚方向開孔有用 2通安裝具之第-貫穿孔lh。此外，第！圖⑷的俯視 圖令的U係獲得第！圖⑹的剖面圖之切斷位置。此外， 於第一導體1的外側的第—剖面側lc隔著第—預定距離， 於板厚方向貫穿地開孔有定位用的第—凹部—此外，該 凹部lp亦可為非貫穿的孔。 人 如第2圖所示，構成實施形態一的連接裝置之第 n丈牧衣直之弟二導 …系長條板狀的峨，且於該端部的板厚方向開孔有用 以牙通安裝具的第二貫穿孔2h。此外， 圖中的L2俜#得笫？ ριγκ、a 圖的俯視 2从付第2圖⑻的剖面圖之_位£。此外， 灰第一導體2的外側的第二剖面側 w 者第二預定距離， 321332 6 201044727 於板厚方向開挖有定位用的第二凹部2p。此外，該凹部2p 亦可為貫穿的孔。 構成實施形態一的連接裝置之第三導體3的寬度DW3 係具有與長條板狀的第一導體〗的寬度DW1及第二導體2 的見度DW2中狹窄的一方大致相同或者以上的寬度之板狀 的薄板（具有比第一導體1及第二導體2為薄的板厚），如 第3圖所示，於第三導體3的中央部的板厚方向開孔有用 〇以穿通安裝具的第三貫穿孔3h。此外，第3圖⑷的俯視 '圖中的L3係獲得第3圖（b)的剖面圖之切斷位置❶此外’ 於第一導體3的兩端的第一剖面侧〗c的板的下表面隔著前 述第m離設置有定位用的第一突起3td，於第二剖 面侧2c的板的上表面隔著第二預定距離設置有相同的定 位用的第二突起3tu。這些第一突起3M與第二突起3tu 係為緊固安裝具時分別收容於第一凹部lp與第二凹部 中的大小。 ❹ 此外，第三導體3係以銅或链等較軟且高導電性的金 屬或以該等金屬為主成分之合金所構成，並於其表面施予 鑛銀處理此外’㈣處理除了鍍銀之外，鋪、鍍錫、 或鍍該等合金亦有助於降低接觸電阻。此外，本發明的鍵 2錢了藉由浸潰於保持有電解質的鑛覆液而形成鍍覆 層者之外，亦可為藉由使用真空裳置或_置等氣相製 版技#、或者藉由使用有機金屬蒸氣之伽(㈤^如 去叩沉印。^。11;化學氣相沉積）裝置等而形成鑛覆層 嘗0 321332 7 201044727 俨卜如:_4,圖所不’實施形態-的連接裝置10係由第-導 盡和q —導體2、第三導體3、以及將第一導體1至第三 導體3彼此緊固的安裝具所構成。此外_ 圖中的L4 #寐俨货ζ π / ; '、4第4圖⑻的剖面圖之切斷位置。實施形 : 梭用的安裝具係由六角螺栓4、六角螺帽5、以及 所構成，但亦可為其他形狀的螺栓和螺帽，或可蔣 :緊固之柳—此類者。以下，說明實施形態2 連接裝置的安裝順序。 第：2孔於第—導體1的端部之第—凹部1P插人設置於 的咖空虹3的板下表面之第—突起3td後，將第三導體3 ^笛孔^重疊於第一導體1的貫穿孔lh。此係藉由預 先在第-導體1的貫穿；Llh與第—凹部 3:離’而能對合第三導體3的貫穿孔此二 =，將開挖於第二導體2的端部之第二凹部2p插入 的板上表面之第二突起^後，將第二 2h重4於第三導體3的貫穿孔3h。此係 1預先ί第二導體2的貫穿孔2h與第二凹部2p之間隔 办 了 σ第二導體3的貫穿孔3h與第二 大起3tu者。 的第接二於弟—導體1的第-貫穿孔h及第二導體2 等ί:貝牙孔㉛分別重疊藝片6及塾片7的孔，以穿過該 :貝牙孔與料的孔之方式穿通六角螺检4。將六角螺帽5 插入至六角螺检4的突出端並予以螺緊’藉此第三導體係 321332 8 201044727 被夾緊在第一導體與第二導體之間，完成連接裝置10的安 裝。此時，柔軟的第三導體3的第一突起3td與第二突起 3tu係藉由前述螺緊而分別收容於第一導體1的第一凹部 lp與第二導體2的第二凹部2p中，藉此，前述第一導體、 第二導體、以及第三導體各者的配置係被定位並固定。 由於第一導體1、第二導體2、以及第三導體3皆為板 狀，因此第三導體3的各面與相對向的第一導體及第二導 . 體的各表面係能以整面接觸狀態緊固，於第一導體1、第 ® 二導體2、與第三導體3之間不會有間隙，而能獲得不會 產生放電的接觸電阻。此外，由於第三導體3的寬度DW3 係具有與長條板狀的第一導體1及第二導體2各者的寬度 DW1、DW2中狹窄的一方大致相同或者其以上的寬度，因此 於第一導體的側端部與第二導體之間不會有間隙，故不會 因為放電導致發熱。 此外，由於實施形態一的第三導體3的長度DL3只要 〇 為能確保對第一導體1及第二導體2進行通電的容許電流 密度之接觸面積即可，因此只要將第三導體3的接觸面積 作成寬度DW3與DL3之積即可。由於實施形態一的第三導 體3的寬度DW3為與前述第一導體1及第二導體2各者的 寬度DW1、DW2中狹窄的一方的寬度大致相同或者其以上的 寬度，因此能將用以形成能確保前述容許電流密度的接觸 面積之長度DL3作成最小。換言之，在實施形態一的連接 裝置中，能以將該第一導體1及第二導體2與第三導體3 接觸的長度作成最小之方式來設計，因此能獲得輕量化之 9 321332 201044727 特別的效果。此外，第三導體3的板厚比第一導體丨及第 二導體2的板厚愈薄時，輕量化的效果愈顯著。 實施形態二 上述實施形態一的第一導體與第二導體雖為長條板 狀彳並非疋要為長條板狀，即使是例如圓柱狀乃至於 擴圓柱狀，亦能構成同樣的連接裝置。以下，依據附圖詳 細說明本發明的實施形態二。第5圖係本發明實施形態二 的連接裝置的第-導體的俯視圖與正面圖。第6圖係本發 明實施形態二的連接農置的第二導體的俯視圖與正面圖。 第7圖係本發明實施形態二的連接裝置的第三導體的俯視 圖、剖面圖、以及正面圖。第8圖係實施形態二的連接裝 置的連接部週邊的俯視圖與正面剖面圖。此外，在第5圖 至第^圖中，與第！圖至第4圖相同或相等的部分係附上 相同符號。 如第5圖所示’構成實施形態二的連接裝置之 體8係長條圓柱狀的銅線，以通過心部之方式於 第-⑽開孔有用以穿通安裝具之第一貫穿孔 I此外，料財心部之方式， 側的第一剖面側lc隐輩铱 守歷δ的外 者第一預定距離以通過圓的中心部 之方式以貝牙狀態開孔有定 凹部亦可為非貫穿孔 的第—凹部1ρ。此外，該 示，構成實施形態二的連接裝置之第二導 版9 ir、長條橢圓柱狀的鋼 式於第—骞麟Qμ 、且以通過橢圓的中心部之方 弟一“9的端部開孔有用以穿通安裝具之第二貫穿 321332 201044727 孔2h。此外，於第二導體9的外側的第二剖面側隔著 第二預定距離，於橢圓的中心部方向開挖有定位用的第二 凹部2p。此外，該凹部如亦可為貫穿狀態的孔。 >、構成實施形態二的連接裝置之第三導體n的寬度 係為具備有相對向的弓型凹部之H字形，該相對向的弓形 凹部係具有與長條板狀的第一導體8及第二導體9各者的 寬度_、觀中狹窄的一方的寬度大致相同或其以上的寬 〇度L如第7圖所示’於第三導體11的中央部開孔有用以穿 ，通f裝具的第三貫穿孔3h。此外，第三導體3係以較柔軟 且尚導電性的導體所構成，且於其表面施予鍍覆處理。前 述相對向的弓型凹部的極化率係分別大致與第一導體8及 第二導體9的極化率相等’以構成第-導體8及第二導體 9 y刀別嵌於第三導體丨丨的各凹部。此外，於第三導體u $兩端的第一剖面側1…型下面凹部隔著前：第一預 心離設置有定位用的第一突起加，於第二剖面側^的 〇弓型上面凹部隔著第二預定距離設置有相同的定位用的第 =突起。這些第_•突起3td與第二突起3tu係為緊固 女裝具時分別收容於第一凹部1?與第二凹部2p中之大小。 如第8圖所示’實施形態二的連接裝置2〇係由第一導 體8、第二導體9、第三導體n、以及將 導體彼此緊固之安裝具所構成。此外，第8圖⑷的俯t 的隻传第8圖⑻的剖面圖之切斷位置。實施形能 :中所使用的安裝具係由六角螺栓4與六角螺帽5所構 、。以下，說明實施形態二的連接裝置的安裝順序。 321332 】1 201044727 第端部之第-凹部1p插入設置於 型的下面凹部之第-突起㈣之後，將第 :=貝穿孔扯重疊於第-導體8的貫穿孔…接 :’：開f於第二導體9的端部之第二凹部2P插入至設置 的弓型上面凹部之第二突起加之後，將第 :〃的貝穿孔2h重疊於第三導體3的貫穿孔北。接 將第—導體8的第-貫穿孔lh與第二導體9的第二貫 穿孔2h重疊，以穿過這些貫穿孔之方式穿通六角螺检心 =螺帽5並予以螺緊’完成實施形態二的連接裝置 由於第導體8及第一導體9與柔軟的第三導體I} 之相對向的各φ的極化率大致相等，所以第三導 面係形成為與前述第—導體8及第二導體9的表面平行的 面而正面接觸並緊固，因此於第一導體8及第二導體9、 與第二導體11之間不會有間隙，不會產生放電，而能降低 接觸電阻。此外，由於第三導體u的寬度DW3係具有與長 條板狀的第-導體8及第二導體9各者的寬度則、嫩 中狹窄的一方的寬度大致相同或者其以上的寬度，因此第 一導體的側端部與第二導體之間不會有間隙，故不會產生 因為放電而導致發熱。此外，與實施形態一同樣的理由， 只施形悲二的第三導體1 ]的長度DL3係能以所需的最小限 度進行設計’而具有可謀求連接裝置的輕量化之效果。此 外，具備使用有此種本發明的連接裝置的斷路器或開閉器 之配電盤係成為可靠性高且輕量的配電盤。 321332 12 201044727 【圖式簡單說明】 第1圖（a)及（b)係本發明實施形態一的第一導體的 部的俯視圖與剖面圖。 第2圖（a)及（b)係本發明實施形態一的第二導體的端 部的俯視圖與剖面圖。 第3圖（a)及（b)係本發明實施形態一的第三導體的俯 視圖與剖面圖。 〇 第4圖（a)及（b)係本發明實施形態一的連接裝置的連 接部週邊的俯視圖與剖面圖。 第5圖（a)及（b)係本發明實施形態二的第一導體的端 部的俯視圖與正面圖。 第6圖（a)及（b)係本發明實施形態二的第二導體的端 部的俯視圖與正面圖。 第7圖（a)及（b)係本發明實施形態二的第三導體的俯 視圖 '剖面圖、以及正面圖。 〇 第8圖（a)及（b)係本發明實施形態二的連接裳置的連 接部週邊的俯視圖與正面剖面圖。 【主要元件符號說明】 1 ' 8 第一導體 lc 第一剖面側 lh 第一貫穿孔 lp 第一凹部 2、9 第二導體 2c 第二剖面侧 2h 第二貫穿孔 2p 第二凹部 3、11 第三導體 3h 第三貫穿孔 3td 第一突起 3tu 第二突起 13 321332 201044727 4 六角螺栓（安裝具） 5 六角螺帽（安裝具） 6、7 墊片 10、20 連接裝置 14 321332201044727 VI. Description of the Invention: [Technical Field] The present invention relates to a first conductor such as a bus bar, a second conductor such as a power supply bus, and a connection between the first conductor and the second conductor A connecting device composed of a jig and a switchboard having a circuit breaker or a shutter using the connecting device. [Prior Art] The connection between the plate-shaped bus bar constituting the conventional connecting device and the plate-shaped power supply bus bar is, for example, an end portion of the bus bar provided with the first through hole and a power supply bus bar provided with the second through hole The ends of the ends are overlapped, and the hexagon bolts are inserted through the first through holes and the second through holes, and the hex nuts are screwed to the through ends of the hexagon bolts. Further, in order to reduce the contact resistance at the time of the overlap, the end of the contact with the tributary bar and the end of the power supply bus are subjected to the clock silver treatment. For the workability of the cash-strip treatment of the bus bar and the power supply bus, it is not easy to immerse the bus bar and the power supply bus belonging to the weight in the liquid material and to impart the transportability of the == strip and the power supply bus. In order to avoid the silver-treated material, the means for the contact member having the tubular shape of the bus bar and the power supply bus are much smaller. The means is a type of connection; a circle = a first through hole at the end of the bus bar is inserted into the cylindrical outer diameter of the outer diameter of the first button (four) contact member having the power supply busbar of the second through hole The opposite end of the end portion 1 is provided, and the hexagonal bolt is inserted through the ferrule portion of the contact member, and the contact member (cylindrical shape) is 321332 4 201044727 ▲The first tooth hole of the scallop, the hexagonal snail The cap screw is tight to the feedthrough end of the hexagon bolt (see, for example, Patent Document 1). [Problem to be Solved by the Invention] In a connection device using a conventional contact member having a ferrule portion, there is a problem in that the ferrule of the contact member is used. The portion is lost between the bus bar and the bus bar. Therefore, current flows intensively through the ferrule portion of the contact member, and 'causes a gap formed around the ferrule portion, so that corona discharge or the like easily occurs to generate heat. SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a connecting device which has low contact resistance and does not cause discharge, and a power distribution panel using the same. (Means for Solving the Problem) The connecting device of the present invention is composed of a first conductor, a second conductor, a third conductor C), and a mounting member; the first guiding system has a first through hole at an end portion; The second guiding system has a second through hole at the end portion; the third guiding system has a third through hole and is subjected to a plating treatment; the mounting member penetrates through the first through hole, the third through hole, and the second through hole And fastening the third conductor with the first conductor and the second conductor; the opposing faces of the first conductor and the third conductor fastened by the mounting device are in full-surface contact, and the width of the second conductor is described It is above the width of the aforementioned first conductor. (Effect of the Invention) The connection device having the above-described configuration can reduce the contact resistance by sandwiching and tightening the 321382 5 201044727 two conductors subjected to the plating treatment between the first conductor and the second conductor, and Since the width of the third conductor is equal to or greater than the width of the first conductor, there is no gap between the first conductor and the second conductor, so that no discharge occurs. [Embodiment] Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the accompanying drawings. Fig. i is a plan view and a cross-sectional view showing an end portion of a first conductor constituting the connecting device of the first embodiment of the present invention. Figure 2 is a plan view and a plan view of the end of the second conductor.帛3 is a top view and a cross-sectional view of the third conductor. Fig. 4 is a plan view and a cross-sectional view showing the vicinity of a joint portion of a connection device of a heart shape. In addition, the same symbols in the drawings denote the same or equivalent parts. As shown in Fig. 1, the first conductor 1 constituting the connecting device of the first embodiment is pure in a pure shape, and the first through-hole lh of the two-way mounting tool is opened in the thickness direction of the lands. Also, the first! The top view of the figure (4) is obtained by the U series! The cut position of the cross-sectional view of Fig. (6). Further, the first cross-sectional side lc on the outer side of the first conductor 1 is provided with a first concave portion for positioning in the thickness direction through a predetermined distance therebetween. Further, the concave portion lp may be a non-penetrating hole. . As shown in Fig. 2, the nth yam, which is the connecting device of the first embodiment, is a long-plate-shaped cymbal, and is opened in the thickness direction of the end portion. The second through hole 2h. In addition, what is the L2俜# in the picture? Ριγκ, a plan view of the figure 2 from the cross-sectional view of Figure 2 (8). Further, the second cross-sectional side w of the outer side of the gray first conductor 2 is a second predetermined distance, and the second concave portion 2p for positioning is excavated in the thickness direction of the 321332 6 201044727. Further, the recess 2p may also be a through hole. The width DW3 of the third conductor 3 constituting the connecting device of the first embodiment has a width substantially equal to or larger than the narrow one of the width DW1 of the elongated first conductor and the visibility DW2 of the second conductor 2. a plate-shaped thin plate (having a thinner plate thickness than the first conductor 1 and the second conductor 2), as shown in Fig. 3, a hole is formed in the thickness direction of the central portion of the third conductor 3 to pierce the mounting member The third through hole 3h. Further, in the plan view of Fig. 3 (4), the L3 system obtains the cut position of the cross-sectional view of Fig. 3(b), and the lower surface of the plate of the first cross-section side c of the both ends of the first conductor 3 The first protrusion 3td for positioning is provided at a distance from the first mth, and the second protrusion 3tu for positioning is provided on the upper surface of the plate of the second cross-sectional side 2c by a second predetermined distance. The first protrusions 3M and the second protrusions 3tu are sized to be accommodated in the first recess lp and the second recess, respectively, when the fixture is fastened. Further, the third conductor 3 is made of a soft and highly conductive metal such as copper or a chain or an alloy containing the metal as a main component, and is subjected to mineral silver treatment on the surface thereof. In addition, plating, tinning, or plating of these alloys also helps to reduce contact resistance. In addition, the key of the present invention may be formed by immersing in a coating layer in which an electrolyte is retained to form a plating layer, or by using a vacuum coating or a gas phase plate technique, or By using the eutectic of the organometallic vapor ((5) ^ such as 叩 叩 。 。 ^ ^ ; ; ; ; ; ; ; ; ; 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝 尝The connecting device 10 is constituted by a first-to-end and q-conductor 2, a third conductor 3, and a mounting member that fastens the first conductor 1 to the third conductor 3 to each other. In addition, _ in the figure, L4 #寐俨货ζ π / ; ', 4 Figure 4 (8) cut-off position of the sectional view. Implementation shape: The mounting tool for the shuttle is composed of a hexagon bolt 4, a hex nut 5, and the like, but it can also be a bolt and a nut of other shapes, or a hose that can be fastened. Hereinafter, the mounting procedure of the connecting device of the second embodiment will be described. The second hole 3 is superimposed on the first protrusion 3td of the lower surface of the slab of the stencil 3, after the first recess 1P of the end of the first conductor 1 is inserted The through hole lh of the conductor 1. This is achieved by the penetration of the first conductor 1 in advance; the Llh and the first recess 3: away from the through hole of the third conductor 3, and the second end of the second conductor 2; After the second protrusions of the upper surface of the upper surface of the recessed portion 2p are inserted, the second 2h is weighted by 4 through the through hole 3h of the third conductor 3. In this case, the through hole 2h of the second conductor 2 and the second recess 2p are spaced apart from each other by the through hole 3h and the second large 3tu of the second conductor 3. The first through-second brother-the first through hole h of the conductor 1 and the second conductor 2, etc.: the beryllium hole 31 overlaps the hole of the art piece 6 and the bracts 7 respectively, to pass through the bead hole and the material The way of the hole is through the hexagonal screw test 4. The hex nut 5 is inserted into the projecting end of the hex screw 4 and screwed, whereby the third guide system 321332 8 201044727 is clamped between the first conductor and the second conductor to complete the attachment of the connecting device 10. At this time, the first protrusion 3td and the second protrusion 3tu of the flexible third conductor 3 are respectively housed in the first recess lp of the first conductor 1 and the second recess 2p of the second conductor 2 by the screwing, Thereby, the arrangement of each of the first conductor, the second conductor, and the third conductor is positioned and fixed. Since the first conductor 1, the second conductor 2, and the third conductor 3 are all plate-shaped, each surface of the third conductor 3 and each of the opposing first conductor and the second conductor can have a full surface. The contact state is tightened, and there is no gap between the first conductor 1, the second conductor 2, and the third conductor 3, and a contact resistance that does not cause discharge can be obtained. Further, since the width DW3 of the third conductor 3 has substantially the same width as or larger than the narrow one of the widths DW1 and DW2 of each of the elongated first conductor 1 and the second conductor 2, the first width is There is no gap between the side end portion of the conductor and the second conductor, so that heat is not generated by the discharge. Further, since the length DL3 of the third conductor 3 according to the first embodiment is only required to ensure the contact area of the allowable current density for energizing the first conductor 1 and the second conductor 2, the contact of the third conductor 3 is required. The area is formed by the product of the width DW3 and DL3. Since the width DW3 of the third conductor 3 according to the first embodiment is substantially the same as or equal to the width of one of the widths DW1 and DW2 of the first conductor 1 and the second conductor 2, it can be used. The length DL3 of the contact area which ensures the aforementioned allowable current density is made minimum. In other words, in the connection device according to the first embodiment, the length in which the first conductor 1 and the second conductor 2 are in contact with the third conductor 3 can be minimized, so that the weight can be reduced. 9 321332 201044727 Special effect. Further, when the thickness of the third conductor 3 is smaller than the thickness of the first conductor 丨 and the second conductor 2, the effect of weight reduction becomes more remarkable. (Embodiment 2) The first conductor and the second conductor of the first embodiment are not long and have a long plate shape, and the same connection device can be constructed, for example, in a cylindrical shape or a cylindrical shape. Hereinafter, the second embodiment of the present invention will be described in detail with reference to the accompanying drawings. Fig. 5 is a plan view and a front view of a first conductor of the connecting device according to the second embodiment of the present invention. Fig. 6 is a plan view and a front view showing a second conductor connected to the farm according to the second embodiment of the present invention. Fig. 7 is a plan view, a cross-sectional view, and a front view of a third conductor of the connecting device according to the second embodiment of the present invention. Fig. 8 is a plan view and a front sectional view showing the vicinity of a connecting portion of the connecting device of the second embodiment. In addition, in the 5th to the ^th, and the first! The same or equivalent parts in the drawings to Fig. 4 are attached with the same symbols. As shown in Fig. 5, the body 8 of the connecting device constituting the second embodiment is a long cylindrical copper wire which is used to penetrate the first through hole I of the mounting member through the opening of the first (10) through the core portion. In the way of the financial center, the first section of the side is lc hidden. The first predetermined distance of the outside of the δ is circumscribed by the center of the circle. The hole is opened in the shape of the beak. The recessed portion may also be a non-through hole. The first recess 1ρ. In addition, it is shown that the second guide plate 9 ir of the connecting device of the second embodiment, the long elliptical cylindrical steel type is in the first unicorn Qμ, and the center of the ellipse is the center of the ellipse. The opening is configured to pass through the second through hole 321332 201044727 hole 2h of the mounting member. Further, the second cross-sectional side of the outer side of the second conductor 9 is excavated in the direction of the central portion of the ellipse with a second predetermined distance. The second recessed portion 2p. The recessed portion may be a hole that penetrates. The width of the third conductor n constituting the connecting device of the second embodiment is an H-shape having a corresponding arcuate recessed portion. The opposing arcuate recesses have a width L which is substantially the same as or larger than the width _ and the width of each of the elongated first conductors 8 and the second conductors 9 as shown in FIG. The opening in the central portion of the third conductor 11 is used to pass through the third through hole 3h of the f-mounting device. Further, the third conductor 3 is formed of a relatively soft and electrically conductive conductor and on the surface thereof. Applying a plating treatment. Polarization of the aforementioned opposite bow recesses Each of the concave portions of the first conductor 8 and the second conductor 9 is substantially equal to the first conductor 8 and the second conductor 9 so as to form the first conductor 8 and the second conductor 9 y so as to be embedded in the recesses of the third conductor bore. The first cross-section side of the first end of the first and second sides of the u-shaped end is separated by a front portion: the first pre-centered portion is provided with a first protrusion for positioning, and the upper portion of the second arch-shaped side is separated by a second predetermined distance. The same protrusions for positioning are provided. The first protrusions 3td and the second protrusions 3tu are sized to be accommodated in the first recess 1 and the second recess 2p, respectively. The connecting device 2 of the second embodiment is composed of a first conductor 8, a second conductor 9, a third conductor n, and a fixture for fastening the conductors to each other. Further, Fig. 8(4) Only the cutting position of the cross-sectional view of Fig. 8 (8) is transmitted. The mounting tool used in the configuration is composed of a hexagon bolt 4 and a hex nut 5. The installation of the connecting device of the second embodiment will be described below. 321332 】1 201044727 The first end-recess 1p of the first end is inserted into the lower concave portion of the type After the first protrusion (four), the first hole is inserted into the through hole of the first conductor 8 and the second recess 2P of the end of the second conductor 9 is inserted into the upper concave portion of the bow. After the second protrusion is applied, the first perforation 2h of the first conductor is superposed on the north through hole of the third conductor 3. The first through hole lh of the first conductor 8 is overlapped with the second through hole 2h of the second conductor 9. Passing through the through-holes to pass through the hex screw core = nut 5 and screwing it'. The connecting device of the second embodiment is formed by the relative direction of the first conductor 8 and the first conductor 9 and the soft third conductor I} Since the polarizing ratios of the respective φ are substantially equal, the third guiding surface is formed in a plane parallel to the surfaces of the first conductor 8 and the second conductor 9 and is in contact with the front surface, and is fastened to the first conductor 8 and the second conductor. There is no gap between the conductor 9 and the second conductor 11, and no discharge is generated, and the contact resistance can be lowered. In addition, since the width DW3 of the third conductor u has a width which is equal to or larger than the width of each of the elongated first conductor 8 and the second conductor 9, the width is substantially the same or more than the width of the first conductor 8 and the second conductor 9 There is no gap between the side end portion of one conductor and the second conductor, so that heat generation due to discharge does not occur. Further, for the same reason as in the first embodiment, only the length DL3 of the third conductor 1 which is formed by the second method can be designed with a minimum required degree, and the weight reduction effect of the connection device can be obtained. Further, a switchboard having a circuit breaker or a shutter using the connection device of the present invention is a highly reliable and lightweight switchboard. 321332 12 201044727 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 (a) and (b) are a plan view and a cross-sectional view showing a portion of a first conductor according to a first embodiment of the present invention. Fig. 2 (a) and (b) are a plan view and a cross-sectional view showing an end portion of a second conductor according to the first embodiment of the present invention. Fig. 3 (a) and (b) are a plan view and a cross-sectional view showing a third conductor according to the first embodiment of the present invention. Fig. 4 (a) and (b) are a plan view and a cross-sectional view showing the vicinity of a connecting portion of a connecting device according to a first embodiment of the present invention. Fig. 5 (a) and (b) are a plan view and a front view of an end portion of a first conductor according to a second embodiment of the present invention. Fig. 6 (a) and (b) are a plan view and a front view of an end portion of a second conductor according to a second embodiment of the present invention. Fig. 7 (a) and (b) are a plan view and a front view, respectively, of a third conductor according to a second embodiment of the present invention. Fig. 8 (a) and (b) are a plan view and a front cross-sectional view showing the vicinity of a connecting portion of the second embodiment of the present invention. [Description of main component symbols] 1 ' 8 First conductor lc First cross-sectional side lh First through-hole lp First recess 2, 9 Second conductor 2c Second cross-section side 2h Second through-hole 2p Second recess 3, 11 Three conductor 3h Third through hole 3td First protrusion 3tu Second protrusion 13 321332 201044727 4 Hex bolt (mounting tool) 5 Hex nut (mounting tool) 6, 7 Shims 10, 20 Connecting device 14 321332