546674 A7 B7 五、發明説明（1) 【發明的技術領域】 (請先閱讀背面之注意事項再填寫本頁) 本發明係有關自動斷路器、漏電斷路器等爲對象的斷 路器之電磁跳脫裝置。 【先行技術】 首先以前述自動斷路器爲例，將本發明實施對象之斷 路器之結構示於第3圖。圖中1爲斷路器外殼，2爲電源 側的端子，3爲固定接觸子，4爲活動接觸子，5爲接觸 子開關機構，6爲開關操作把手，7爲過大電流跳脫裝置 之電磁鐵單元，8爲與電磁鐵單元7連結之斷路十字桿， 9爲連結於接觸子開關機構5與斷路十字桿8之間的閂座 ，1 〇爲負荷側的端子，電磁鐵單元7的電磁線圈中介安 裝於負荷側端子1 〇與活動接觸子4之間而連接於主電路 〇 經濟部智慧財產局員工消費合作社印製 又，前述電磁鐵單元7如第4圖所示，係由電磁鐵線 圈1 1，將銜鐵1 2 a向下插入電磁鐡線圈1 1的油緩衝 筒（οι卜dash-pot )式線圏鐡心1 2，L字形架接鐵片1 3 ，在架接鐵片1 3下端擺動自如地以樞紐結合的支點形電 樞1 4，及從電樞1 4後端以L字形彎曲延伸到架接鐵片 1 3背後的操作臂1 4 a所構成，將各零件組裝於單元箱 殼1 5後內裝於第3圖的斷路器外殼1。 該斷路器的動作如所眾所週知，在圖示的開啓（〇N )狀態，主電路電流從電源側端子2經固定接觸子3，活 動接觸子4，電磁鐵單元7之電磁鐡線圏1 1，負荷側端 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 546674 A7 B7 五、發明説明（2) 子1 0，流向負荷側。此時，將操作把手6倒向關閉（ (請先閱讀背面之注意事項再填寫本頁) 〇F F )位置，則開關機構5會將活動接觸子4驅動爲關 閉（0 F F )位置。又，過大電流流經主電路時，由於電 磁鐵單元7的吸引動作，電樞1 4被吸引到銜鐵1 2 a， 設於電樞1 4的操作臂1 4 a會擺動而叩擊第3圖所示的 斷路十字桿8的活動臂8 a，以解開斷路十字桿8與閂座 9的卡合。由於如此，接觸子開關機構5會遊動使活動接 觸子4分開而切斷主電路電流。 經濟部智慧財產局8工消費合作社印製 以下以第5圖（a )〜（d )說明前述電磁鐵單元7 於吸引動作時，電樞1 4與斷路十字桿8之間的連結動作 。首先，第5圖（a )係表示斷路器爲關閉（〇f F )， 或主電路流通著定額電流的正常狀態，電磁鐵單元7的電 樞1 4接受回歸彈簧1 6的彈力而後退到離開銜鐵1 2 a (空隙長度g )的位置。在此正常狀態下，從電樞1 4後 端向上延伸的操作臂1 4 a和與之對峙著而從斷路十字桿 8向下突出的活動臂8 a之間係分開著，而且閂座9的卡 合片9 a係抵住於斷路十字桿8的爪部8 b而保持於該位 置。再者，斷路十子桿8係由回歸彈賛（未於圖示）彈壓 於圖示的待機位置，而且閂座9係以上端爲擺動支點，被 彈壓向反時鐘方向。 一方面，過大電流流經電磁鐵單元7的電磁鐵線圈 1 1時，如第5圖（b ) 、 （ c )所示，由電磁鐵的吸引 力，電樞1 4會被吸引向銜鐵1 2 a，隨此動作，操作臂 1 4 a會以樞紐點0爲支點反時鐘方向擺動，而該操作臂 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐) "" " 一~ -5- 546674 A7 B7 五、發明説明（3) (請先閱讀背面之注意事項再填寫本頁) 前端會撞抵斷路十字桿8的活動臂8 a，將斷路十字桿8 壓向順時鐘方向。再者，操作臂1 4 a前端與活動臂8 a 相抵的著力點（力量作用點）以P表示。經第5圖（c ) 的狀態而到5圖（d )所示電樞1 4被銜鐵1 2 a吸著的 狀態時，閂座9的卡合片9 a與斷路十字桿8的爪部8 b 的卡合脫開，閂座9由於彈壓彈簧而向反時鐘方向擺動以 釋放接觸子開關機構（參考第3圖）的閂部。結果，開關 機構會有斷路作動使活動接觸子4離開電極而切斷主電路 電流。 [發明所欲解決的課題】 然而，爲了促進斷路器的小型化及減低消耗電力，而 在佔有大空間的電磁鐵單元採用小型、小容量的電磁鐡時 ，如維持前述以往的電磁跳脫裝置，則會發生下述斷路器 的跳脫動作不安定的問題。 經濟部智慈財產局〕貝工消f合作社印製 亦即，在根據發明者等進行的實驗資料的第2圖的特 性圖中，A爲將2 0 0 %過大電流流經額定容量大的電磁 鐵（3 3 〇 A 丁）時的吸引力特性，B爲將2 0 0 %過大 電流流經額定容量小的電磁鐵（2 〇 〇 A T )時的吸引力 特性。再者，電磁鐵的吸引力如眾所週知，係與電樞和銜 鐵之間的空隙長度g (參考第5圖（a ))的平方成反比 〇 相對於此，在第5圖的電磁跳脫裝置，由電磁鐵單元 7的吸引動作，將斷路十字桿8從待機位置向釋放位置驅 本纸張尺度適用f國_標準（CNS ) M規格（別幻97公麓） -6- 546674 A7 B7 五、發明説明（4) (請先閱讀背面之注意事項再填寫本頁) 動之際，介由被彈簧彈推著的閂座9，斷路十字桿8的活 動臂8 a，及抵接於該活動臂前端（著力點p )的操作臂 1 4 a，以力矩（m〇ment )作用於電樞1 4的負荷荷重（ 逆著電磁鐵的磁性吸引力將電樞從銜鐵分離的力量）係成 爲如C所示的特性。再者，此例中，電樞的回歸彈簧1 6 (參考第5圖）會成爲負荷荷重（5 g )附加。 此處如採用額定容量大的電磁鐵作爲電磁鐵單元7， 則其吸引力（特性A )會比電樞的負荷荷重（特性C )大 ，因此能夠將斷路十字桿8驅動到釋放位置沒有問題。相 對於此，如前所述爲了推動斷路器的小型化而使用額定容 量小的電磁鐡時，其吸引力特性B與電樞的負荷荷重特性 C會在圖中斜線表示的部分c 1 (對應於第5圖（b )的 狀態）交叉，在此部分電樞的負荷荷重會超過電磁鐵的吸 引力。因此，電磁鐵的電樞會停止在此位置，而不能將斷 路十字桿的活動臂壓過此位置以上，以致有斷路器不能跳 脫的情形。 經濟部智慈財產局員工消費合作社印製 像這樣，如維持以往構造的電磁跳脫裝置，要採用小 型、小容量的電磁鐵來將斷路器小型化會有困難。 本發明有鑒於上述問題點，其目的在於以電磁鐵單元 的吸引動作驅動斷路十字桿之際，將以反作用力作用於電 磁鐵的電樞的荷重（功）分散，使與電磁鐵的吸引力特性 整合，有效發揮額定容量小的電磁鐵的吸引力，以提供改 良爲能夠進行穩定跳脫動作的斷路器之電磁跳脫裝置。 本纸張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） 546674 A7 B7 五、發明説明（5) 【用以解決課題的手段】 (請先閱讀背面之注意事項再填寫本頁) 爲了達成上述目的，依照本發明係檢測出主電路的過 大電流而啓動，經由斷路十字桿及閂座使主電路接點的開 關機構斷路作動的斷路器之電磁跳脫裝置，讓設於檢測出 過大電流而吸引動作的電磁鐵單元的支點形電樞的操作臂 與設於斷路十字桿的活動臂對峙，於電磁鐵單元動作時接 受其吸引力而與電樞一起擺動的前述操作臂推壓斷路十字 桿的活動臂，以釋放閂座來使開關機構斷路作動， 於電磁鐵單元的吸引動作時，配合電樞與銜鐵之間的 空隙長度的變化，讓前述操作臂和活動臂的著力點沿操作 臂的長邊方向階段性變化，在空隙長度較大的吸引動作前 半段，將著力點設定於操作臂的根部側以降低加在電樞的 荷重，在空隙長度較小的吸引動作後半段，將著力點移到 fe作臂的則端側來驅動斷路十字桿的活動臂（申請專利第 1項）， 其具体彩態爲，設於電磁鐵單元的電樞的操作臂和設 於斷路十字桿的活動臂係配置成互相從反方向延伸而對峙 經濟部智慧財產局員工消費合作社印製 ，而且將fe作臂做成直線臂，活動臂沿其長邊方向面對操 作臂的面形成有階梯狀變化的段差部（申請專利第2項） 〇 依照上述結構，以電磁鐵單元的吸引動作將斷路十字 桿驅動到釋放位置之際，於其前半段（電樞與銜鐵之間的 空隙長度大而磁性吸引力小），因斷路十字桿的活動臂和 操作臂的著力點位於操作臂的根部側，故從斷路十字桿 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -8- 546674 A7 B7 五、發明説明（6) (請先閱讀背面之注意事項再填寫本頁) 附加於電磁鐵的電樞的力矩荷重依槓桿原理而抑制於較低 値。因此，即使電磁鐵爲吸引力比較小的小容量，電樞也 不致停在中途，而介由操作臂能夠將斷路十字桿的活動臂 壓向釋放位置。 一方面，電樞的吸引動作進行而前述空隙長度減小時 ，連接到電樞的操作臂的傾角改變，抵到活動臂的著力點 會移向操作臂的前端側。因此從斷路十字桿側附加到電樞 的力矩荷重雖變大，但電樞的空隙長度變小則電磁鐵的吸 引力也會增加，故能夠將斷路十字桿驅動到最終位置而無 問題。 亦即，電磁鐵單兀的吸引動作時，配合電樞和銜鐵之 間的空隙長度的變化，將前述操作臂和活動臂的著力點作 成沿操作臂的長邊方向階段性變化，就能夠將相對應於從 待機位置驅動斷路十字桿到釋放位置所需的功（力X距離 )的電樞的荷重整合於電磁鐵的吸引力特性，由於如此， 能夠有效發揮小型、小額定容量的電磁鐵的吸引力，使斷 路器斷路作動。 經濟部智慈財產局員工消費合作社印製 【發明的實施形態】 以下根據第1圖、第2圖所示的實施例說明本發明的 實施形態。又，第1圖中對應於第5圖的同一構件賦予相 同符號而省略其說明。 第1圖所示實施例的電磁跳脫裝置，基本上雖與第5 圖所示的構造相同，但對峙於從斷路十字桿8向下延伸的 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -9- 546674 A7 __ _B7 五、發明説明（7 ) (請先閱讀背面之注意事項再填寫本頁) 電磁鐵單元7的操作臂1 4 a側方的活動臂8 a，有下述 的形狀變更。又，第1圖（a )〜（d )分別表示相對應 於第5圖（a )〜（d )的動作狀態。 亦即，圖不實施例的活動臂8 a，該臂前端對著從下 向上挺立的操作臂1 4 a，設定成與其長邊方向的中央部 相向的長度（第5圖以往構造則活動臂8 a前端與操作臂 1 4 a前端相向），而且與操作臂1 4 a相向的面，沿長 邊方向形成階梯狀變化的段差部8 a - 1。 經濟部智慧財產局員工消費合作社印製 依照該結構的跳脫動作係如下述進行。首先，第i圖 (a )表示平常狀態，與第5圖（a ) —樣電磁鐵單元7 的電樞1 4係從銜鐵1 2 a後退著，操作臂1 4 a係以向 右傾斜的姿勢停止於離開斷路十字桿8的活動臂8 a的位 ® °此時當主電路流進過大電流使電磁鐵單元7開始吸引 動作時，操作臂1 4 a會以電樞1 4的樞紐結合部爲支點 〇反時鐘方向擺動，於第1圖（b)的位置操作臂1 4 a 的中間部（腹部）會碰抵活動臂8 a前端予以推壓。此狀 態下，操作臂1 4 a和活動臂8 a之間的著力點爲p 1， 從斷路十字桿8側介由操作臂1 4 a作用於電樞1 4的力 矩荷重爲，附加於著力點P 1的力量（反作用力）和操作 臂1 4 a的支點〇到著力點p 1的距離的乘積。 一方面，電磁鐵的吸引動作更進展，電樞丨4被吸引 到第1圖（c )的位置而操作臂1 4 a的傾角改變時，操 作臂1 4 a和活動臂8 a的的抵接點移到前述段差部8 a 一 1，隨此轉移操作臂1 4 a和活動臂8 a之間的著力點 本纸張尺度( CNS ) A4規格（υοχ 297讀) "' —— -10- 546674 A7 B7 五、發明説明（8) (請先閱讀背面之注意事項再填寫本頁} 從p 1移到P 2。至此狀態，從斷路十字桿8側介由操作 臂1 4 a作用於電樞1 4的力矩荷重變爲，附加於著力點 P 2的力量和電樞1 4的支點◦到著力點P 2的距離的乘 積，與第1圖（b )比較負荷荷重會增加。然後當如第1 圖（d )所示電樞1 4被銜鐵1 2 a吸住時，與第5圖（ d ) —樣，閂座9的卡合片9 a與斷路十字桿8的爪部 8 b的卡合會脫離，閂座9由於彈推彈簧而反時鐘方向擺 動以釋放接觸子開關機構的閂部，由於如此開關機構會有 斷路作動而切斷主電路電流。 在此將前述跳脫動作的電樞1 4的負荷荷重標繪在第 2圖的特性圖上予以表示時，就成爲特性線D。特性線D 上的D 1 、D 2點分別相對應於第1圖（b ) 、（ c )的 經濟部智慧財產局员工消资合作社印製 狀態。由此可知，相對應於電樞和銜鐵之間的空隙長度g 的電樞負荷荷重，會成爲如圖示的階梯狀變化，在空隙長 度g較大的吸引動作前半段（著力點P 1 )電樞的負荷荷 重小，在空隙長度g較小的吸引動作後半段（著力點P 2 )時負荷荷重增加，在此階梯狀荷重式樣下，由電磁鐵單 元7的吸引動作將斷路十字桿8驅動到釋放位置。而且， 在吸引動作前半因降低電樞的負荷荷重，即使採用額定容 量小的電磁鐵，其吸引力特性（B線）與負荷荷重特性（ D線）也不會在中途交叉，又在吸引動作後半段負荷荷重 雖增加，因電磁鐵的吸引力也增加，故能夠將斷路十字桿 驅動到最後位置沒有問題。 再者，本發明並不限定於圖示實施例的構造，圖示實 本纸張尺度適用中國國家標準（CNS ) A4規格（2IOX 297公釐） -11 - 經濟部智慈財產局員工消費合作社印製 546674 A7 B7 五、發明説明（9) 施例雖將設定著力點P 1、P 2的階梯狀段差部形成於活 動臂8 a，但也可將其形成於操作臂1 4 a側。又，其著 力點的設定數也可配合電磁鐵的吸引力特性曲線分爲3點 以上實施。 【發明的效果】 如以上所述，依照本發明，讓設於檢測出過大電流而 吸引動作的電磁鐵單元的支點形電樞的操作臂與斷路十字 桿的活動臂對峙，於電磁鐵單元吸引動作時前述操作臂推 壓斷路十字桿的活動臂使開關機構斷路作動的結構中， 於電磁鐡單元的吸引動作時，配合電樞與銜鐵之間的 空隙長度的變化，讓前述操作臂和活動臂的著力點沿操作 臂的長邊方向階段性變化，當空隙長度大的吸引動作前半 段，將著力點設定於操作臂的根部側以降低附加在電樞的 荷重，於空隙長度變小的吸引動作後半段，將著力點移到 操作臂的前端側來驅動斷路十字桿的活動臂， 斷路器的跳脫動作時，巧妙整合從斷路十字桿側介由 活動臂、操作臂作用於電磁鐵的電樞的負荷荷重式樣和電 磁鐵單元的吸引力特性，於採用吸引力比較小的小型、小 額定容量的電磁鐵作爲電磁鐵單元的情形下，也能有效發 揮其吸引力，能夠使斷路器確實斷路作動，由於如此而能 貢獻於搭裝在斷路器的電磁跳脫裝置的小型、小容量化， 進而推展斷路器的小型、省能化。 本纸張尺度適用中國國家標準（CNS ) Α4規格（210Χ 297公麓） j ------IT------β (請先閱讀背面之注意事項再填寫本頁) -12- 546674 A7 B7 五、發明説明（19 【圖面的簡單說明】 第1圖：本發明實施例之電磁跳脫裝置之構造及跳脫 (請先閱讀背面之注意事項再填寫本頁) 動作說明圖，（a )〜（d )表示其跳脫動作不同的狀態 〇 第2圖：第1圖之電磁跳脫裝置及以往電磁跳脫裝置 之電磁鐵空隙長度與電樞負荷荷重之間的關係一倂表示與 電磁鐵吸引力之特性圖。 第3圖：本發明實施對象之斷路器結構剖面圖。 第4圖：第3圖之電磁鐵單元組裝構造之分解立體圖 〇 弟5圖：以往之斷路器所採用之電磁跳脫裝置之構造 及跳脫動作說明圖，（a )〜（d )表示其跳脫動作不同 的狀態。 【圖號說明】 3 固定接觸子 4 活動接觸子 經濟部智慧財產局8工消費合作社印製 5 接觸子開關機構 7 電磁跳脫裝置之電磁鐵單元 8 斷路十字桿 8 a 活動臂 8 a - 1 段差部 9 閂座 11 電磁鐵線圈 本纸張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -13- 546674 A7 B7 五、發明説明（11) 12a 銜鐵 13 架接鐵片 14 電樞 14a 操作臂 g 空隙長度 P1， P1 著力點 (請先閱讀背面之注意事項再填寫本頁 、-口 έ 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ 297公釐） -14-546674 A7 B7 V. Description of the Invention (1) [Technical Field of the Invention] (Please read the precautions on the back before filling out this page) The present invention relates to the electromagnetic trip of circuit breakers such as automatic circuit breakers and earth leakage circuit breakers. Device. [Preceding technology] First, the aforementioned automatic circuit breaker is taken as an example, and the structure of the circuit breaker of the present invention is shown in FIG. 3. In the figure, 1 is the circuit breaker shell, 2 is the terminal on the power source side, 3 is the fixed contactor, 4 is the movable contactor, 5 is the contactor switch mechanism, 6 is the switch operating handle, and 7 is the electromagnet of the over-current trip device. Unit 8 is an open cross bar connected to the electromagnet unit 7, 9 is a latch seat connected between the contact sub-switch mechanism 5 and the open cross bar 8, 10 is a load-side terminal, and the solenoid of the electromagnet unit 7 The intermediary is installed between the load-side terminal 1 and the movable contactor 4 and is connected to the main circuit. It is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The electromagnet unit 7 is shown in FIG. 4 by an electromagnet coil. 1 1. Insert the armature 1 2 a downward into the oil-dash-pot type wire core 1 1 of the electromagnetic coil 1 1. The L-shaped bracket is connected to the iron piece 1 3, and the bracket is connected to the iron piece 1 3 The lower end swings freely and pivotally combines the fulcrum-shaped armature 1 4 and the L-shaped curved arm extending from the rear end of the armature 1 4 to the back iron 1 1 a. The unit case 15 is installed inside the circuit breaker case 1 of FIG. 3. The operation of this circuit breaker is well known. In the open (ON) state shown in the figure, the main circuit current flows from the power supply side terminal 2 through the fixed contact 3, the movable contact 4, and the electromagnetic coil 圏 1 of the electromagnet unit 7. The paper size of the load side is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 546674 A7 B7 V. Description of the invention (2) Sub 10, flow to the load side. At this time, turn the operation handle 6 to the closed ((Please read the precautions on the back before filling in this page) 〇F F) position, then the switch mechanism 5 will drive the movable contactor 4 to the closed (0 F F) position. When an excessive current flows through the main circuit, the armature 14 is attracted to the armature 1 2 a due to the attraction action of the electromagnet unit 7, and the operating arm 1 4 a provided on the armature 14 swings to hit the third The movable arm 8 a of the circuit breaker cross bar 8 shown in the figure is used to release the engagement between the circuit breaker cross bar 8 and the latch seat 9. Because of this, the contact switch mechanism 5 will swim to move the movable contact 4 apart and cut off the main circuit current. Printed by the 8th Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The following describes the connection operation between the armature 14 and the circuit breaker cross bar 8 when the aforementioned electromagnet unit 7 is in the suction operation with reference to Figs. 5 (a) to (d). First, Fig. 5 (a) shows that the circuit breaker is closed (0 f F), or the main circuit is in a normal state with a constant current. The armature 14 of the electromagnet unit 7 receives the elastic force of the return spring 16 and retracts to Leave armature 1 2 a (gap length g). In this normal state, the operating arm 1 4 a extending upward from the rear end of the armature 14 is separated from the movable arm 8 a opposed to it and protruding downward from the circuit breaker 8 and the latch seat 9 The engaging piece 9 a is held in this position against the claw portion 8 b of the cut-off cross bar 8. In addition, the broken ten-pole 8 is pressed to the standby position shown in the figure by a return bomb (not shown), and the upper end of the latch 9 series is a swing fulcrum, which is elastically pressed in the counterclockwise direction. On the one hand, when an excessive current flows through the electromagnet coil 11 of the electromagnet unit 7, as shown in Figs. 5 (b) and (c), the armature 14 will be attracted to the armature 1 by the attraction of the electromagnet. 2 a, with this action, the operating arm 1 4 a will swing in the counterclockwise direction with the pivot point 0 as the fulcrum, and the paper size of the operating arm is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) " " & quot I ~ -5- 546674 A7 B7 V. Description of the invention (3) (Please read the precautions on the back before filling this page) The front end will hit the movable arm 8 a of the circuit breaker 8 and press the circuit breaker 8 toward Clockwise. In addition, the point of force (the point of force action) where the front end of the operating arm 1 4 a and the movable arm 8 a abut is denoted by P. When the armature 1 4 shown in FIG. 5 (d) is sucked by the armature 1 2 a through the state shown in FIG. 5 (c), the engaging piece 9a of the latch seat 9 and the claw portion of the circuit breaker 8 The engagement of 8 b is disengaged, and the latch seat 9 swings in the counterclockwise direction due to the elastic spring to release the latch portion of the contact sub-switch mechanism (refer to FIG. 3). As a result, the switching mechanism may have an open circuit action to move the movable contactor 4 away from the electrode and cut off the main circuit current. [Problems to be Solved by the Invention] However, in order to promote miniaturization of a circuit breaker and reduce power consumption, when a small-sized, small-capacity electromagnetic coil is used for an electromagnet unit occupying a large space, the aforementioned conventional electromagnetic trip device is maintained. , The problem of unstable tripping of the circuit breaker described below will occur. Bureau of Intellectual Property, Ministry of Economic Affairs] Printed by Bei Gong Xiao Cooperative, that is, in the characteristic diagram of Fig. 2 based on experimental data conducted by the inventor, A is a 200% overcurrent flowing through a large rated capacity. The attractive characteristic when an electromagnet (3 〇A D) is used, and B is the attractive characteristic when an excessive current of 200% is passed through an electromagnet (200AT) with a small rated capacity. Moreover, as is well known, the attractive force of the electromagnet is inversely proportional to the square of the gap length g (refer to Fig. 5 (a)) between the armature and the armature. In contrast, the electromagnetic tripping device in Fig. 5 By the attracting action of the electromagnet unit 7, the circuit breaker cross rod 8 is driven from the standby position to the release position. The paper size is applicable to the country _ standard (CNS) M specification (not magic 97 feet) -6- 546674 A7 B7 five 、 Explanation of invention (4) (Please read the precautions on the back before filling in this page) When moving, through the latch seat 9 pushed by the spring, the movable arm 8 a of the cross bar 8 and abut on the The operating arm 1 4 a at the front end of the movable arm (point of force p) acts on the load of the armature 14 with a moment (m0ment) (the force separating the armature from the armature against the magnetic attraction of the electromagnet). It has characteristics as shown in C. Furthermore, in this example, the return spring 16 (refer to FIG. 5) of the armature is added with a load (5 g). Here, if an electromagnet with a large rated capacity is used as the electromagnet unit 7, its attractive force (characteristic A) is greater than the load load of the armature (characteristic C), so there is no problem in being able to drive the trip cross rod 8 to the release position. . On the other hand, when the electromagnetic 小 的 with a small rated capacity is used to promote the miniaturization of the circuit breaker as described above, the attractive characteristic B and the load load characteristic C of the armature are indicated by the part c 1 (corresponding to the diagonal line in the figure) In the state shown in Figure 5 (b)), the load of the armature in this part will exceed the attractive force of the electromagnet. Therefore, the armature of the electromagnet will stop at this position, and the movable arm of the breaking cross bar cannot be pressed above this position, so that the circuit breaker cannot trip. Printed by the Consumer Cooperatives of the Intellectual Property Office of the Ministry of Economic Affairs. It is difficult to miniaturize the circuit breaker using a small, small-capacity electromagnet if the conventional electromagnetic trip device is maintained. The present invention has been made in view of the above problems, and an object thereof is to disperse the load (work) of the armature by a reaction force on the armature when the circuit breaker is driven by the attraction action of the electromagnet unit, so as to attract the magnet The characteristics are integrated, and the attractive force of the electromagnet with a small rated capacity is effectively used to provide an electromagnetic trip device improved to a circuit breaker capable of stable trip operation. This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 546674 A7 B7 V. Description of the invention (5) [Means to solve the problem] (Please read the precautions on the back before filling this page) In order to achieve the above object, according to the present invention, an electromagnetic trip device of a circuit breaker which is activated by detecting an excessive current of a main circuit and opening a switching mechanism of a main circuit contact via a disconnecting cross bar and a latch seat is provided to detect the The operating arm of the fulcrum armature of the electromagnet unit that attracts the action due to the excessive current is opposed to the movable arm provided on the open cross bar. When the electromagnet unit operates, it receives the attraction and swings with the armature. Disconnect the movable arm of the cross bar to release the latch seat to open the switch mechanism. When the electromagnet unit is attracted, cooperate with the change in the length of the gap between the armature and the armature to allow the operating points of the aforementioned operating arm and movable arm to act. Stepwise change along the long side of the operating arm. In the first half of the suction action with a large gap length, set the force point on the root side of the operating arm to reduce At the load of the armature, in the second half of the attraction action with a small gap length, the focus point is moved to the end of the fe as the arm to drive the movable arm of the circuit breaker (the first patent application). The specific color state is The operating arm of the armature provided on the electromagnet unit and the movable arm provided on the breaking cross bar are arranged to extend from opposite directions to each other and printed by the consumer consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, and the fe is made into a straight line. A stepped portion is formed on the surface of the arm and the movable arm facing the operation arm along its long side (No. 2 in the patent application). According to the above structure, the breaking cross rod is driven to the release position by the attraction action of the electromagnet unit. At the same time, in the first half (the length of the gap between the armature and the armature is large and the magnetic attraction is small), since the action point of the movable arm of the circuit breaker and the operating arm is located at the root side of the operation arm, This paper size applies to Chinese National Standard (CNS) A4 specification (210X 297 mm) -8- 546674 A7 B7 V. Description of invention (6) (Please read the notes on the back before filling this page) Attached to The moment load of the armature of the electromagnet is suppressed to a low value according to the principle of leverage. Therefore, even if the electromagnet has a small capacity with a relatively small attractive force, the armature does not stop in the middle, and the movable arm of the circuit breaker can be pressed to the release position via the operating arm. On the one hand, when the suction action of the armature is performed and the aforementioned gap length is reduced, the inclination angle of the operating arm connected to the armature changes, and the point of contact with the movable arm will move to the front end side of the operating arm. Therefore, although the moment load applied to the armature from the crossbar side becomes larger, as the gap length of the armature becomes smaller, the attraction force of the electromagnet also increases, so the crossbar can be driven to the final position without any problem. That is, during the attraction operation of the electromagnet unit, in accordance with the change in the length of the gap between the armature and the armature, the working points of the operation arm and the movable arm can be changed in stages along the long side of the operation arm, so that the The load of the armature corresponding to the work (force X distance) required to drive the crossbar from the standby position to the release position is integrated with the attractive characteristics of the electromagnet. Because of this, it is possible to effectively exert a small, small rated capacity electromagnet The attractive force makes the circuit breaker open. Printed by the Employees' Cooperative of the Intellectual Property Office of the Ministry of Economic Affairs [Embodiments of the invention] The following describes the embodiments of the present invention based on the embodiments shown in Figs. 1 and 2. The same components in FIG. 1 as those corresponding to FIG. 5 are given the same reference numerals, and descriptions thereof are omitted. The electromagnetic trip device of the embodiment shown in FIG. 1 is basically the same as the structure shown in FIG. 5, but applies the Chinese National Standard (CNS) A4 specification to the paper size extending downward from the circuit breaker 8 (210X 297mm) -9- 546674 A7 __ _B7 V. Description of the invention (7) (Please read the precautions on the back before filling out this page) Operating arm of the electromagnet unit 1 4 a Lateral movable arm 8 a There are the following shape changes. Figs. 1 (a) to (d) show operating states corresponding to Figs. 5 (a) to (d), respectively. That is, the movable arm 8 a of the embodiment is not shown in the figure, and the front end of the arm is opposed to the operating arm 1 4 a standing up from the bottom, and is set to a length facing the central portion in the longitudinal direction. The front end of 8 a is opposite to the front end of operation arm 1 4 a), and the surface facing the operation arm 14 a forms a stepped portion 8 a-1 that changes stepwise along the longitudinal direction. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs The tripping action according to this structure is as follows. First, Fig. I (a) shows the normal state, and Fig. 5 (a)-the armature 14 of the sample electromagnet unit 7 is retracted from the armature 1 2a, and the operating arm 14a is inclined to the right. The posture stops at the position of the movable arm 8 a that is away from the cross bar 8 °. At this time, when a large current flows in the main circuit and the electromagnet unit 7 starts to attract, the operating arm 1 4 a will be connected by the pivot of the armature 14 The part is a fulcrum and swings in the counterclockwise direction. The middle part (abdomen) of the operating arm 1 4 a at the position shown in FIG. 1 (b) will abut against the front end of the movable arm 8 a and be pushed. In this state, the point of force between the operating arm 1 4 a and the movable arm 8 a is p 1, and the moment load acting on the armature 14 from the side of the cross bar 8 through the operating arm 1 4 a is The product of the force (reaction force) at the point P 1 and the distance from the fulcrum 0 of the operating arm 14 a to the point of impact p 1. On the one hand, the attracting action of the electromagnet is further advanced. When the armature 丨 4 is attracted to the position of FIG. 1 (c) and the inclination of the operating arm 1 4 a is changed, the resistance of the operating arm 1 4 a and the movable arm 8 a The contact is moved to the aforementioned step difference 8a-1, and then the force between the operating arm 14a and the movable arm 8a is shifted. The paper size (CNS) A4 specification (υοχ 297 reading) " '——- 10- 546674 A7 B7 V. Description of the invention (8) (Please read the precautions on the back before filling in this page} Move from p 1 to P 2. At this state, the action of the cross arm 8 from the open cross rod through the operating arm 1 4 a The moment load on the armature 14 becomes the product of the force added to the force point P 2 and the fulcrum of the armature 14 to the force point P 2, and the load load increases compared to FIG. 1 (b). Then, when the armature 14 is sucked by the armature 1 2 a as shown in FIG. 1 (d), as in FIG. 5 (d), the engaging piece 9 a of the latch seat 9 and the claw of the circuit breaker cross rod 8 The engagement of the part 8 b will be disengaged, and the latch seat 9 will swing in the counterclockwise direction due to the spring, so as to release the latch contacting the sub-switch mechanism. As a result, the switch mechanism will open the circuit and cut off the main part. When the load load of the armature 14 in the above-mentioned tripping action is plotted on the characteristic diagram in FIG. 2, it becomes the characteristic line D. The points D 1 and D 2 on the characteristic line D are respectively Corresponding to the printed status of the employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, Figures (b) and (c) of Figure 1. It can be seen that the armature load corresponding to the gap length g between the armature and the armature, It will change stepwise as shown in the figure. The load load of the armature is small in the first half of the suction operation with a large gap length g (the load point P 1), and the second half of the suction operation (the load point P 2 with a small gap length g) ), The load load increases. Under this stepped load pattern, the breaking cross bar 8 is driven to the release position by the suction action of the electromagnet unit 7. Moreover, the load load of the armature is reduced in the first half of the suction action, even if the rated capacity is used. The attractive characteristics (line B) and load characteristics (line D) of small electromagnets do not cross midway. Although the load load increases during the second half of the suction operation, the attractive force of the electromagnet also increases. Break Ten There is no problem in driving the lever to the final position. Moreover, the present invention is not limited to the structure of the illustrated embodiment. The actual paper size shown in the figure is applicable to the Chinese National Standard (CNS) A4 specification (2IOX 297 mm) -11-Economy Printed by the Ministry of Intellectual Property Bureau's Consumer Co-operative Society 546674 A7 B7 V. Description of the Invention (9) Although the stepped steps with the force points P 1 and P 2 are set on the movable arm 8 a, they can also be formed It is located on the side of the operating arm 1 4 a. In addition, the set number of its operating points can be divided into three points or more according to the attractive force characteristic curve of the electromagnet. [Effects of the Invention] As described above, according to the present invention, the operating arm of the fulcrum-shaped armature provided in the electromagnet unit that detects the excessive current and attracts the action is opposed to the movable arm of the open cross bar, and is attracted to the electromagnet unit. In the structure in which the aforementioned operating arm pushes the movable arm of the cross-bar to open the switch mechanism during operation, during the attracting action of the electromagnetic cymbal unit, the length of the gap between the armature and the armature is adjusted to allow the aforementioned operating arm and movable The force point of the arm changes gradually along the long side of the operating arm. When the first half of the suction action with a large gap length is set, the force point is set at the root side of the operating arm to reduce the load on the armature and the gap length becomes smaller. In the second half of the suction action, move the force point to the front side of the operating arm to drive the movable arm of the circuit breaker. When the circuit breaker trips, it is skillfully integrated to act on the electromagnet from the side of the circuit breaker through the movable arm and the operation arm. The load-bearing style of the armature and the attractive characteristics of the electromagnet unit are used for small, small rated capacity electromagnets with relatively small attractive forces. In the case of an electromagnet unit, it can effectively exert its attractive force, and it can make the circuit breaker actuate reliably. Because of this, it can contribute to the miniaturization and small capacity of the electromagnetic trip device mounted on the circuit breaker. Miniaturization and energy saving. This paper size is applicable to Chinese National Standard (CNS) Α4 specification (210 × 297 feet) j ------ IT ------ β (Please read the precautions on the back before filling this page) -12- 546674 A7 B7 V. Description of the invention (19 [Simplified description on the drawing] Figure 1: Structure and tripping of the electromagnetic trip device of the embodiment of the present invention (please read the precautions on the back before filling this page) (A) ~ (d) show different states of tripping. Figure 2: The relationship between the length of the electromagnet gap and the armature load of the electromagnetic tripping device of Fig. 1 and the conventional electromagnetic tripping device.倂 shows the characteristic drawing of the attraction force with the electromagnet. Fig. 3: Cross-sectional view of the circuit breaker structure of the object of the present invention. Fig. 4: An exploded perspective view of the assembly structure of the electromagnet unit in Fig. 3. Fig. 5: The conventional circuit breaker. The structure of the electromagnetic tripping device used by the device and the description of the tripping action, (a) ~ (d) indicate different states of the tripping action. [Description of the drawing number] 3 Fixed contactor 4 Mobile contactor Intellectual property of the Ministry of Economic Affairs Printed by Bureau 8 Industrial Cooperative Cooperative 5 Contact Sub Switching Mechanism 7 Electromagnet unit of the electromagnetic trip device 8 Opening cross bar 8 a Movable arm 8 a-1 segment difference 9 Latch base 11 Electromagnet coil This paper size applies to Chinese National Standard (CNS) A4 (210X 297 mm)- 13- 546674 A7 B7 V. Description of the invention (11) 12a Armature 13 Frame iron piece 14 Armature 14a Operating arm g Clearance length P1, P1 Focus point (please read the precautions on the back before filling in this page, -mouthed economy The paper size printed by the Ministry of Intellectual Property Bureau's Consumer Cooperatives applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm) -14-