JP4042440B2

JP4042440B2 - Earth leakage breaker

Info

Publication number: JP4042440B2
Application number: JP2002079003A
Authority: JP
Inventors: 敏宏大井戸; 浩藤雄木; 健彦岡田; 知行澤田; 卓也香川; 崇稲次; 宏一山添; 安男市村
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2002-03-20
Filing date: 2002-03-20
Publication date: 2008-02-06
Anticipated expiration: 2022-03-20
Also published as: JP2003272508A

Description

【０００１】
【発明の属する技術分野】
本発明は、２極の主接点を有する２極型の漏電遮断器に関し、特に各極毎に地絡事故や短絡事故による異常な大電流から保護する電磁釈放装置を備えた漏電遮断器に関するものである。
【０００２】
【従来の技術】
従来の２極型の漏電遮断器として特開平１１−２５８４１号公報に記載されたものがある。この漏電遮断器は、地絡事故や短絡事故による異常な大電流が主接点に流れた場合に開閉機構を釈放して主接点を強制的に開極する電磁釈放装置が各極の入力端子側にそれぞれ配設されるとともに、これらの電磁釈放装置とは別に、器体の底面側に配設された零相変流器によって漏洩電流が検出された場合に通電されるコイルを具備し開閉機構を釈放して主接点を強制的に開極する漏電保護用の電磁釈放装置が器体内に配設されていた。
【０００３】
【発明が解決しようとする課題】
上記従来例にあっては、各極毎に地絡事故や短絡事故による異常な大電流が流れた場合に開閉機構を釈放する２つの電磁釈放装置と、漏洩電流検出によるコイルへの通電によって開閉機構を釈放する漏電保護用の電磁釈放装置という独立した３つの電磁釈放装置を用いているので、部品点数が多くなり、省スペース化が図れずに器体が大型化してしまうという問題があった。
【０００４】
本発明は上記問題に鑑みて為されたものであり、その目的とするところは、各極毎に地絡事故や短絡事故による異常な大電流からの保護を図りつつ、部品点数の削減による省スペース化並びに小型化が図れる漏電遮断器を提供することにある。
【０００５】
【課題を解決するための手段】
請求項１の発明は、上記目的を達成するために、２極の主接点を有した主回路を収納する器体と、少なくとも一部が器体から回動自在に露出するハンドルと、少なくともハンドルの操作に応じて主回路の主接点を開閉する開閉機構と、地絡事故や短絡事故により異常な大電流が主回路の一方の主接点に流れた場合に開閉機構を釈放して主接点を強制的に開極する第１の電磁釈放装置と、前記異常大電流が主回路の他方の主接点に流れた場合に開閉機構を釈放して主接点を強制的に開極する第２の電磁釈放装置と、漏洩電流を検出する漏洩電流検出手段と、漏洩電流検出手段にて漏洩電流が検出されると開閉機構を釈放して主接点を強制的に開極する第３の電磁釈放装置とを備え、第１及び第２の電磁釈放装置は、主回路を形成する各極の通電導体を固定鉄心との間に挟む形で固定鉄心に揺動自在に接離する可動鉄心をそれぞれ具備し可動鉄心が固定鉄心に吸引された場合に開閉機構を釈放してなり、第３の電磁釈放装置は、第１の電磁釈放装置が具備する固定鉄心にコイルを巻装してなり、前記開閉機構は、主接点を閉極状態にラッチさせるラッチ部材と、主接点を開極状態へ移行させるラッチ部材の動きを規制するとともに第１〜第３の電磁釈放装置により前記規制が解除される引外し部材とを具備し、第２の電磁釈放装置が具備する可動鉄心を前記引外し部材に取着してなる漏電遮断器であって、第１の電磁釈放装置を、器体内における第２の電磁釈放装置の固定鉄心側に、可動鉄心の動作方向が第２の電磁釈放装置における可動鉄心の動作方向と略直交するように収納し、第１及び第２の電磁釈放装置の固定鉄心に対向する器体内の位置に漏洩電流検出手段を配置したことを特徴とし、第１の電磁釈放装置を構成する固定鉄心及び可動鉄心を漏電保護用の第３の電磁釈放装置に兼用することにより、従来に比較して部品点数を削減することができ、各極毎に地絡事故や短絡事故による異常な大電流からの保護を図りつつ、省スペース化並びに小型化が図れるとともに、可動鉄心の動きを引外し部材に伝える部材が不要となり、部品点数をさらに削減でき、且つ可動鉄心と引外し部材との距離を縮めることで一層の小型化が図れ、さらに第１及び第２の電磁釈放装置の可動鉄心や引外し部材の動作スペースを十分に確保することができるとともに器体内のスペースを有効に利用できて一層の小型化が図れる。
【０００８】
【発明の実施の形態】
以下、本発明の一実施形態を図１〜図１５を参照して詳細に説明する。
【０００９】
本実施形態は、両側の合成樹脂製の第１側ケース１Ａと第２側ケース１Ｂとを連結して構成される器体１内に、器体１の幅方向に並設された２つの固定接点２Ａ，２Ｂと、これら各固定接点２Ａ，２Ｂに接離自在に対向する可動接点３Ａ，３Ｂを固着した２つの可動接触子４Ａ，４Ｂと、これらの２つの可動接触子４Ａ，４Ｂを駆動する開閉機構５とを備え、ハンドル６の投入・開放操作により開閉機構５を介して各可動接点３Ａ，３Ｂを各固定接点２Ａ，２Ｂに接離（接触・開離）させる構成となっており、各固定接点２Ａ，２Ｂ及び各可動接触子４Ａ，４Ｂを、器体１の高さ方向に上下に配設するとともに両可動接触子４Ａ，４Ｂの内、高さ方向で２つの固定接点２Ａ，２Ｂ間に介在する一方の可動接触子４Ｂと、他方の可動接触子４Ａの可動接点３Ａが接離する固定接点２Ａとを、各固定接点２Ａ，２Ｂから各可動接点３Ａ，３Ｂが開離した状態で器体１の幅方向から見て交差しない高さ位置に配設してある。
【００１０】
器体１の長手方向における一端部内には両側ケース１Ａ，１Ｂ間に挟み込むようにして、合成樹脂材料から成形された中間ケース７を固定しており、第１側ケース１Ａの側壁（外壁）内側の凹部８と中間ケース７の縦壁部３５とで構成される区画内に固定接点２Ａを一端に設けた電圧極側の出力端子を構成する端子ブロック１０Ａを収納し、中間ケース７の第２側ケース１Ｂ側に設けた凹部９と第２側ケース１Ｂの側壁（外壁）とで構成される区画内に下側の固定接点２Ｂを一端に設けた中性極側又は他方の電圧極側の出力端子を構成する端子ブロック１０Ｂを収納してある。
【００１１】
端子ブロック１０Ａは、コ状に折り曲げられた端子板１１と、該端子板１１の下片の一端より上方に延長片１１ａが一体延長され、該延長片１１ａの上端から延長片１１ａに対し直角に折り曲げて端子板１１に対して外向きに一体延長された固定接触子１２Ａと、該固定接触子１２Ａの一端上面にかしめ固定された固定接点２Ａと、端子板１１の下片上に載置されて端子板１１内に収納される略ム字状の鎖錠ばね１３Ａとで構成される。そして、上記第１側ケース１Ａの凹部８の下向き傾斜した底面上に端子板１１の下片を乗せ、凹部８の一端の立ち上がり壁８ａに沿うように延長片１１ａを配置し、立ち上がり壁８ａの上端を越えて固定接触子１２Ａを凹部８の外へ導出して立ち上がり壁８ａと、第１側ケース１Ａの底部より立ち上がった隔壁１４との間に凹部８の底部と同様に傾斜させて一体形成した固定接点配置部１５上に固定接触子１２Ａの先部を配置することにより、端子ブロック１０Ａが凹部８内に配設される。固定接点配置部１５には固定接触子１２Ａの下面側に突出した固定接点２Ａの下端を逃がす凹部１５ａが形成されている。端子板１１は上片の他端から上向きにＴ字片１１ｂを一体に延長形成しており、このＴ字片１１ｂの上端の側方突出部の片側先端を第１側ケース１Ａの内側面に形成してある凸平部２２の上端面に載置する。また端子板１１の側片の側面には鎖錠ばね１３Ａの押さえ片１３ｂ内に挿入され、鎖錠ばね１３Ａのがたつきを防止する突起２３を一体に形成してある。
【００１２】
鎖錠ばね１３Ａと端子板１１は導体接続部たる速結端子を構成するもので、第１側ケース１Ａに中間ケース７を重ね合わせた時に、第１側ケース１Ａの他端部の縦壁部に形成した断面が半円状の斜め下向き溝１６０と中間ケース７の対向壁面に形成した壁に同様な形状の斜め下向き溝１６０とで形成される斜め下向き電線挿入孔１６Ａを介して外部より挿入された電線（図示せず）の芯線が端子板１１の上片と鎖錠ばね１３Ａの鎖錠片１３ａの上端と押さえ片１３ｂの上端との間に圧入され、鎖錠片１３ａ先端により電線の引き抜き方向に対して芯線を鎖錠し且つ、押さえ片１３ｂの上端面で芯線を端子板１１の上片に押し付けることにより、電気的に芯線を接続すると共に、機械的に保持するようになっている。この電線鎖錠を解除するのが解除ハンドル１７でこの解除ハンドル１７は下部側面に設けた回動軸１８が第１側ケース１Ａの内側面の凸平部２２に設けた軸孔２０に回動自在に軸支され且つ中間ケース７の縦壁部３５の壁面に突出させている軸（図示せず）を下部他側面に設けた凹部３７に回動自在に軸支してあり、器体１の外側に露出する操作部１７ａを手動操作して回動させることで、下端に設けた駆動突起１９が鎖錠ばね１３Ａの鎖錠片１３ａの一側端の先部を押して鎖錠片１３ａを撓ませ、芯線に対する鎖錠を解除することができるようになっている。図中２１は解除ハンドル１７を常時反手動操作方向に回動付勢する復帰ばねである。
【００１３】
一方端子ブロック１０Ｂは、基本的に端子ブロック１０Ａと同様に端子板１１と、鎖錠ばね１３Ｂと、固定接触子１２Ｂとで構成されているが、端子ブロック１０Ａの端子板１１とは異なり、端子ブロック１０Ｂの端子板１１はその下片の一端より下向きに延長片１１ｃを延長形成し、その延長片１１ｃの先端より器体１の底部と平行するようにして固定接触子１２Ｂを延長形成し、また端子板１１の側片の一端部から直角に延長した奥片１１ｄを形成してある。
【００１４】
鎖錠ばね１３Ｂは、鎖錠ばね１３Ａと同じ構造のものであって、端子板１１の下片上に載置され、端子板１１の側片より突出させた突起２３が押さえ片１３ｂ内に挿入されようになっている。
【００１５】
この端子ブロック１０Ｂは中間ケース７の凹部９の底部を構成し器体１の底部に略平行に延出形成された横壁部２４上に端子板１１の下片を載置するともに、凹部９の一端部の縦壁２５に奥片１１ｄを沿わせるとともに縦壁２５の下端と、横壁部２４の一端部との間に形成された切欠２７に端子板１１の一端を嵌めて延長片１１ｃを凹部９外に出すようになっており、中間ケース７を第１側ケース１Ａ側に重ね合わせときに、固定接触子１２Ｂの先部、つまり固定接点２Ｂを設けた下面が第１側ケース１Ａの底部のリブ２６，２６上に載置されるようになっている。つまり固定接点２Ｂは中間ケース７の横壁部２４及び後述する膨出部３０及び両側ケース１Ａ，１Ｂの側壁間で構成される空間で両側ケース１Ａ，１Ｂ間に跨って配置される。尚リブ２６，２６間の凹所は固定接触子１２Ｂの先部にかしめ固定された固定接点２Ｂの固定接触子１２Ｂの下面側に突出した下端部の逃げとなる。
【００１６】
また端子板１１の上片の他端部より上方に延長形成されたＴ字片１１ｂの上端の側方突出部の先端は中間ケース７の壁面に形成してある凸平部２２’の上端面に載置される。
【００１７】
端子ブロック１０Ｂの鎖錠ばね１３Ｂと端子板１１は端子ブロック１０Ａの場合と同様に導体接続部たる速結端子を構成し、第２側ケース１Ｂに中間ケース７を重ね合わせたときに、中間ケース７の凹部９の他端部の縦壁部に設けられた断面半円状の斜め下向き溝１６０とこの斜め下向き溝１６０と同様に第２側ケース１Ｂの他端部の縦壁に設けられた斜め下向き溝１６０とで形成される電線挿入孔１６Ｂから電線が挿入されるとその芯線を鎖錠ばね１３Ｂの鎖錠片１３ａで鎖錠し、押さえ片１３ｂで芯線を端子板１１の上片に押しつけて電線を電気的に接続するともに機械的に鎖錠するようになっている。
【００１８】
この電線鎖錠を解除するのが解除ハンドル１７’で、この解除ハンドル１７’は上記の解除ハンドル１７と同様に下部側面に設けた回動軸１８が中間ケース７の凸平部２２’に設けた軸孔２０に回動自在に軸支され且つ第２側ケース１Ｂの内側壁面に突出させている軸３８を側面に形成してある凹部３７に回動自在に軸支し、器体１の外側に露出する操作部１７ａを手動操作して回動させたときに下端に設けた駆動突起１９が鎖錠ばね１３Ｂの鎖錠片１３ａの一側端の先部を押して鎖錠片１３ａを撓ませて鎖錠状態を解除することができるようになっている。図中２１’は解除ハンドル１７’を常時反手動操作方向に回動付勢する復帰ばねである。
【００１９】
中間ケース７は両側ケース１Ａ，１Ｂの側壁に略平行する縦壁部３５に対して第２側ケース１Ｂ側へ突出して第２側ケース１Ｂの側壁内面に当接する膨出部３０が形成され、この膨出部３０下面より垂下させた壁が上記縦壁２５であり、第２側ケース１Ｂ側に面する側壁、底壁、一端部の縦壁３２及び天井壁３３とで囲まれた凹所を第１側ケース１Ａ側に設けてある。そして第１側ケース１Ａ側に中間ケース７を突き合わせときに第１側ケース１Ａ側に組み付けてある端子ブロック１０Ａの固定接触子１２Ａの先端側部が凹所の底壁の段面上に載置され、また天井壁３３が第１側ケース１Ａの内側面より突出している横壁２９の下面に沿うよう配置される（図３参照）。また縦壁３２には固定接点２Ａに対応する可動接触子４Ａの自由端を凹所内に挿入するための開口部３９を形成してある。
【００２０】
一方器体１の長手方向における他端内部には、分電盤内において異なる位置（図２の上下方向）に各々配設された３本の導電バー（図示せず）の内で最下段の電圧極の導電バーを差込接続する１つの固定端子Ｔ１を収納配置する収納部９０と、最上段の中性極又は中段の他の電圧極の導電バーの何れかを選択して差込接続する１つの選択端子Ｔ２を中性極及び他の電圧極の導電バーに対応した少なくとも２つの位置間で移動自在に配設する内方収納部２００を設けてある。すなわち、本実施形態では選択端子Ｔ２を中性極の導電バーに接続すれば１００Ｖ、選択端子Ｔ２を他方の電圧極の導電バーに接続すれば２００Ｖの配電電圧に選択的に対応させることができる、いわゆる１００Ｖ／２００Ｖ兼用型となっている。
【００２１】
固定端子Ｔ１及び選択端子Ｔ２は共に略コ字状で、上下に並行する両側片の先部が互いに近接した後、先端にかけて拡開した刃受ばねから構成され、先端拡開により導電バーの差込を容易とし、中央の近接部位で導電バーを挟み込むようになっている。
【００２２】
内方収納部２００には、中性極及び電圧極の２本の導電バーに各々対応する２つの位置で選択端子Ｔ２を位置決めする位置決め手段として、第１側ケース１Ａの内方収納部２００を構成する区画の端部壁面に断面略半円状の突起９７を第１側ケース１Ａの幅方向に設けてある。
【００２３】
前記器体１の内方収納部２００の天井部に当たる壁には、選択端子Ｔ２が中性極又は電圧極の導電バーのうちのどちらに対応する位置にあるのか表示する表示手段として、内方収納部２００内に連通する通孔２０１を設け、この通孔２０１から選択端子Ｔ２を収納したスライド部材８３の上部に形成せる円柱状の表示部２０２が通孔２０１に臨んで外部から視認できるか、通孔２０１から離れた位置にあって外部から視認できないかにより選択端子Ｔ２の位置を知ることができるようになっている。また通孔２０１を介してスライド部材８３を外部から押し操作して下方移動させることも可能としている。この通孔２０１は両側ケース１Ａ、１Ｂの上面側壁に設けた半円の切欠孔２０１ａが突き合わせられて形成される円形の孔からなる。
【００２４】
スライド部材８３は合成樹脂成形品からなり器体１の両端方向に対応する両端面が開口した枠体状に形成されたもので、選択端子Ｔ２を構成する刃受ばねを一端開口から挿入して他端開口より刃受ばねの先端部を突出させるようにして保持しており、選択端子Ｔ２はこのスライド部材８３と共に内方収納部２００内を図２において上下方向に移動自在に配置される。
【００２５】
内方収納部２００の両側壁を構成する両側ケース１Ａ，１Ｂの側壁の内面にはスライド部材８３の両側部に形成したスライド突起２０３を上下移動自在に係合してスライドさせる上下方向のガイド溝２０４を２条の並行する突起２０５間に形成しており、内方収納部２００はこの両側壁のガイド溝２０４，２０４にスライド部材８３の両側のスライド突起２０３を係合した状態でスライド部材８３とともに選択端子Ｔ２を上下方向にスライド移動自在に収納保持している。なお、内方収納部２００側にスライド突起を、ガイド溝をスライド部材８３側に設けても良い。
【００２６】
スライド部材８３は第１側ケース１Ａの側部より図１に示すように図において下方に延びた脚片８３ａを一体に延長形成するとともに、脚片８３ａの下端部のには外向きに突出した突出部２０６を形成してある。
【００２７】
この突出部２０６は内方収納部２００の側壁を構成する第１側ケース１Ａの側壁の外側に第１側ケース１Ａの底面から上方向に形成されたスライド溝（図示せず）の上端底部に内方収納部２００と連通するように開口した挿通孔（図示せず）からスライド溝内に挿入されて脚片８３ａとともにスライド溝内を上下方向にスライド自在に位置される。
【００２８】
スライド溝、挿通孔は選択端子Ｔ２を装着したスライド部材８３を上下移動させるためのガイド部を構成しており、スライド溝の底部は内方収納部２００内に突出するように形成され、スライド溝の上端底部に形成された挿通孔を介してスライド溝内に上方挿入される脚片８３ａの裏面がスライド溝の底部に摺接可能なようになっている。またスライド溝の最上方には突出部２０６がスライド溝の上端部へ移動したときに衝合する突出部（図示せず）を設けてある。
【００２９】
而して、突出部２０６が内方収納部２００内の選択端子Ｔ２を上下移動させる操作部を構成し、器体１外部からこの突出部２０６を持って或いはドライバ等で押し上げたり、押し下げることによってスライド溝内をスライド移動させれば、このスライド移動に伴い内方収納部２００内のスライド部材８３が選択端子Ｔ２と共にスライド突起２０３とガイド溝２０４とによるガイドによって上又は下へ移動することになる。
【００３０】
上記の操作によってスライド部材８３が移動する際、位置決め突起９７をスライド部材８３の先端上部或いは先端下部がその弾性と位置決め突起９７のアール面とにより乗り越え、移動後は位置決め突起９７に枠部８３の先端下部或いは先端上部が当たって、選択端子Ｔ２の位置を保持するようになっている。
【００３１】
さて可動接触子４Ａ，４Ｂを開閉駆動する開閉機構５は、ラッチ部材たる作動板４３と、クロスバー４０と、作動板４３の一端を係止する段状の係止部４１ｅを備えた第１引外し板４１と、第２引外し板４２と、ハンドル６と、コ字状リンク４４等からなる。そして、一方の主接点（固定接点２Ｂ及び可動接点３Ｂ）の閉極状態において地絡事故や短絡事故により異常な大電流が流れれば第１の電磁釈放装置４７Ｂによって、他方の主接点（固定接点２Ａ及び可動接点３Ａ）の閉極状態において同じく地絡事故や短絡事故により異常な大電流が流れれば第２の電磁釈放装置４７Ａによって、主回路に漏洩電流が流れれば漏電保護用の第３の電磁釈放装置４８によって、さらに過負荷電流のような過電流が流れれば熱動釈放装置によって、それぞれ開閉機構５を釈放して主接点を強制的に開極させる。
【００３２】
ハンドル６は、操作部６ａと回動部６ｂとハンドル軸６ｃとで構成され、回動部６ｂの両側面の中央に突出したハンドル軸６ｃを第１側ケース１Ａの内側面に形成された軸孔４９と、第２側ケース１Ｂの内側面に形成された軸孔４９とにそれぞれ回動自在に挿入して両側ケース１Ａ，１Ｂ間に保持され、操作部６ａは、両側ケース１Ａ，１Ｂの連結した状態で構成される器体１の上面に開口する窓孔５０に臨むようになっている。またハンドル軸６ｃにはねじりばね３６が装着され、ねじりばね３６により、ハンドル６は投入操作位置（図２及び図３参照）において、開放操作方向に付勢されている。
【００３３】
回動部６ｂの下端に設けた軸孔６ｄにはコ字状リンク４４の上側軸４４ａを回動自在に挿入して、コ字状リンク４４を介して作動板４３と連結されている。
【００３４】
作動板４３は中央両側に設けた軸受け孔４３ａにコ字状リンク４４の下側軸４４ｂを貫挿させることによりコ字状リンク４４を介してハンドル６と連結され、器体１内に上下移動自在に配置される。
【００３５】
クロスバー４０は上部の両側面に突出させた軸４０ａを両側ケース１Ａ，１Ｂの内側面に形成した軸孔５２、５２に挿入して両側ケース１Ａ，１Ｂ間に枢支されるもので、図３に示すように軸４０ａよりやや下方の第１側ケース１Ａ側の側部には可動接触子４Ａの側部を横方向から嵌める切溝５４を、また図２に示すように下部の第２側ケース１Ｂ側の側部には可動接触子４Ｂを横方向から嵌める切溝５５をそれぞれ設けてある。そして可動接点側端面には、中間ケース７及び第１側ケース１Ａの側壁の内面に突設してある止片１３０を、各可動接点３Ａ，３Ｂが各固定接点２Ａ，２Ｂから開離した状態で係入してその底部に当接する凹溝１３１を幅方向に形成してある（図１２参照）。
【００３６】
ここで可動接触子４Ａは剛体の導電金属板から構成され、クロスバー４０の切溝５４に側方から挿入されるとともに、切溝５４の後ろに設けた凹み部４０ｂ（図３参照）において、後部下面と凹み部４０ｂの底部との間に圧縮配置される接圧用のコイルばね５３により後部が上方に付勢されるようになっており、クロスバー４０が軸４０ａを中心として回動したときに可動接触子４Ａは切溝５４の開口縁を中心として回動し、自由端にかしめ固定した可動接点３Ａを対応する固定接点２Ａに対して開離・接触させるようになっている。
【００３７】
また可動接触子４Ｂは導電性ばね薄板材からなり、クロスバー４０が投入動作方向に回動したときには下方に押されて撓み、この撓んだ状態からクロスバー４０が開放動作方向に回動したときには復帰し、その撓みと、復帰とで、先端にかしめ固定した可動接点３Ｂを固定接点２Ｂに対して接触・開離させるようになっている。
【００３８】
クロスバー４０の下端部は、該下端部と、第１側ケース１Ａの底部より垂立させた壁６３との間で圧縮配置されたコイルばね６２により押されて回転力が付与される。
【００３９】
図５に示すように、第１引外し板４１は軸部４１ａと、この軸部４１ａの上部に突出する突出部４１ｂと、軸部４１ａの下部に突出する一対の脚部４１ｃ，４１ｄとからなり、軸部４１ａの両端を両側ケース１Ａ，１Ｂの内側面に設けられた軸孔５６、５６に挿入して両側ケース１Ａ，１Ｂ間で回動自在に支持される。突出部４１ｂの上端部には作動板４３の一端が係脱する係止部４１ｅを形成し、一方の脚部４１ｃの先端側面には後述するバイメタル４５に押し駆動される受け部４１ｇを突設するとともに、他方の脚部４１ｄの先端側面には第２の引外し板４２に押し駆動される受け部４１ｆを突設している。
【００４０】
第２引外し板４２は軸孔４２ｂを有する中央部から対向部４２ａ並びに受け部４２ｃが突出した略へ字形に形成され、後述する隔壁部材３１に設けられた軸３１ｆを軸孔４２ｂに挿入して回動自在に枢支される。また対向部４２ａの端面には、後述するバイメタル４６の下端に対向し、バイメタル４６の湾曲時に押される駆動片４２ｄが設けてある。
【００４１】
厚板金属材からなる導電板７１Ａ，７１Ｂは、図１及び図５に示すように一端部側に調整螺子７７，７７’が螺合するねじ孔７１ａが貫設され、他端部の下面側に一対のかしめ軸７１ｂが突設されている。そして、熱動釈放装置を構成するバイメタル４５，４６をそれぞれ一端側に溶着固定して垂下させた薄板金属材からなる調整板７２，７２’が、その他端側に貫設された一対の孔７２ａにかしめ軸７１ｂを挿通してかしめることで導電板７１Ａ，７１Ｂの下面側にそれぞれ取り付けられている。
【００４２】
一方のバイメタル４５の調整板７２との固定部分には固定端子Ｔ１に一端が溶着された編組線７９Ａの他端が溶着され、後述する第１の回路基板７３に一端が接続されたリード線８２Ａが溶着されるとともに、一端が可動接触子４Ａに溶着された編組線７９Ｄの他端がバイメタル４５の略中央部に溶着され、固定端子Ｔ１，編組線７９Ａ，導電板７１Ａ，バイメタル４５，編組線７９Ｄ，可動接触子４Ａが電気的に接続されている。また、他方のバイメタル４６の調整板７２’との固定部分には選択端子Ｔ２に一端が溶着された編組線７９Ｂの他端が溶着されるとともに、可動接触子４Ｂに連結された通電導体８０（後述する）に一端が溶着された編組線７９Ｃの他端がバイメタル４６の略中央部に溶着され、選択端子Ｔ２，編組線７９Ｂ，導電板７１Ｂ，バイメタル４６，編組線７９Ｃ，通電導体８０，可動接触子４Ｂが電気的に接続されている。なお、調整螺子７７，７７’を螺進させることで調整板７２，７２’と導電板７１Ａ，７１Ｂとの距離を変化させ、バイメタル４５，４６の下端位置、すなわち熱動釈放装置の感度が調整可能となっている。
【００４３】
ところで、導電板７１Ａ，７１Ｂ並びにバイメタル４５，４６は隔壁部材３１に保持される。この隔壁部材３１は絶縁性を有する合成樹脂成型品からなり、２つのバイメタル４５，４６を隔絶する平板状の隔壁３１ａと、隔壁３１ａの周縁よりその厚み方向（器体１の幅方向）両側へ突出する周壁３１ｂとを有し、隔壁３１ａ並びに周壁３１ｂに囲まれた各凹所３１ｃ，３１ｃに導電板７１Ａとバイメタル４５並びに導電板７１Ｂとバイメタル４６がそれぞれ収納される。凹所３１ｃ，３１ｃ上部の周壁３１ｂには複数の突起３１ｄが対向して突設されており、これらの突起３１ｄ間に導電板７１Ａ，７１Ｂを圧入することで導電板７１Ａ，７１Ｂ並びにバイメタル４５，４６を隔壁部材３１に保持させている（図２及び図３参照）。また、導電板７１Ａ，７１Ｂを収納した凹所３１ｃ，３１ｃの上部周壁３１ｂには、調整螺子７７，７７’を凹所３１ｃ，３１ｃの外へ臨ませるために矩形の切り欠き３１ｅ，３１ｅが形成してある。さらに、導電板７１Ｂ及びバイメタル４６を収納する側の凹所３１ｃ底部には第２引外し板４２の軸孔４２ｂに挿入する軸３１ｆが突設してある。
【００４４】
第２の電磁釈放装置４７Ａは、図５に示すように磁性鉄板を長さの異なる一対の側片６０ａ，６０ｂを有する平面視略コ字型に折曲してなる固定鉄心６０と、矩形平板状の磁性鉄板からなる可動鉄心６１とで構成される。固定鉄心６０は、導電板７１Ａを収納した凹所３１ｃ側の周壁３１ｂに形成された段部３１ｇに載置されるとともに隔壁３１ａに設けられた凹溝３１ｈに一方（短い方）の側片６０ａを嵌合する形で凹所３１ｃ内に収納され、バイメタル４５と周壁３１ｂとの間に挟持される（図３参照）。一方、可動鉄心６１は厚み方向に貫通する一対の貫通孔６１ａが形成され、第１引外し板４１の突出部４１ｂの上端部における係止部４１ｅと反対側の面に突設された一対の突起４１ｈを貫通孔６１ａに挿通してかしめることにより第１引外し板４１に取着され、図３に示すように固定鉄心６０の他方（長い方）の側片６０ｂの先端である磁極面と対向する。
【００４５】
而して、主接点（固定接点２Ａ及び可動接点３Ａ）を含む一方の極のバイメタル４５に地絡事故や短絡事故による異常な大電流が流れたときに固定鉄心６０の側片６０ｂの磁極面に発生する電磁吸引力により可動鉄心６１を吸引揺動させ、可動鉄心６１が取着された第１引外し板４１を、図３における反時計回りに回動させるのである。なお、このように可動鉄心６１を第１引外し板４１に取着することにより、可動鉄心６１の動きを第１引外し板４１に伝える部材（例えば、第１の電磁釈放装置４７Ｂにおける第２引外し板４２のようなもの）が不要となり、部品点数を削減できるとともに可動鉄心６１と第１引外し板４１との距離を縮めることで小型化が図れるものである。
【００４６】
第１の電磁釈放装置４７Ｂは、図６に示すように磁性鉄板を平面視略コ字型に折曲してなる固定鉄心５７と、矩形平板状の磁性鉄板からなる可動鉄心５８と、可動鉄心５８を固定鉄心５７の両端磁極面に揺動自在に対向支持させ且つ可動鉄心５８を固定鉄心５７から離れる向きに弾性付勢する弾性部材たる板ばね５９とで構成される。また、通電導体８０は先端部に編組線７９Ｃの一端が溶着される内片８０ａと、内片８０ａの後端より略Ｌ字形に延出されて内片８０ａと略平行に対向する外片８０ｂとで構成され、外片８０ｂの先端部に可動接触子４Ｂの後端部が連結される。
【００４７】
可動鉄心５８は固定鉄心５７側の面に突出させた突起５８ａ，５８ａを、板ばね５９の中央片５９ａの一端部に形成した孔５９ｂ，５９ｂに挿入してかしめ固定することで板ばね５９に揺動自在に支持される。一方、板ばね５９は中央片５９ａの両側方に折り曲げ形成した両側片５９ｃ，５９ｃを固定鉄心５７の両側片５７ａ，５７ａの外面に沿わせるように配置して両側片５９ｃ，５９ｃの先端に内向きに突出させた係止片５９ｄ，５９ｄを、固定鉄心５７の外側角部に形成した凹部５７ｂ，５７ｂに係止させることにより、図７に示すように通電導体８０の内片８０ａを固定鉄心５７と可動鉄心５８の間に介在させ、内片８０ａと外片８０ｂの間に可動鉄心５８を挟む形で固定鉄心５７に固持される。このとき、固定鉄心５７の両側片５７ａ，５７ａの先端である磁極面が板ばね５９の中央片５９ａと、両側片５９ｃ，５９ｃとの間を介して可動鉄心５８に対向する。
【００４８】
而して、他方の極の主接点を構成する可動接点３Ｂと電気的に接続される通電導体８０に地絡事故や短絡事故による異常な大電流が流れたときに固定鉄心５７の両側片５７ａ，５７ａの磁極面に発生する電磁吸引力により可動鉄心５８を吸引揺動させるのである。なお、このように固定鉄心５７と可動鉄心５８を板ばね５９で連結してブロック化しているため、後述するように第１の電磁釈放装置４７Ｂの器体１への組み込み作業が容易になるものである。
【００４９】
ここで通電導体８０の内片８０ａに流れる電流によって固定鉄心５７の両側片５７ａ，５７ａの磁極面に発生する電磁吸引力の向きと、外片８０ｂに流れる電流によって固定鉄心５７の両側片５７ａ，５７ａの磁極面に発生する電磁吸引力の向きとを同一とし、可動鉄心５８を吸引する電磁吸引力を強めて主接点を素早く開極するようにしている。
【００５０】
一方、第３の電磁釈放装置４８は、第１の電磁釈放装置４７Ｂの固定鉄心５７に励磁用のコイル６８を巻装して構成される。すなわち、図６に示すように合成樹脂のような絶縁材料により一側面が開放した角筒状に形成されたコイルボビン６９を、軸方向両端から固定鉄心５７の側片５７ａ，５７ａをそれぞれ突出するようにして固定鉄心５７に装着し、図７に示すようにコイルボビン６９の軸方向両端部に設けた外鍔６９ａ，６９ａ間にコイル６８が巻回してある。なお、コイルボビン６９の外鍔６９ａ，６９ａの開放された側面近傍には挿着孔６９ｃが貫設された略立方体形の支持部６９ｂ，６９ｂが突設され、略Ｌ字形の端子ピン６９ｄの一端部が挿着孔６９ｃにそれぞれ挿着されており、挿着孔６９ｃから突出する端子ピン６９ｄの一端部にコイル６８の端末６８ａがそれぞれからげて電気的に接続してある。
【００５１】
而して、地絡事故によって漏洩電流が流れたときに後述する漏電保護回路５１により端子ピン６９ｄを介してコイル６８に通電して固定鉄心５７を励磁し、固定鉄心５７の両側片５７ａ，５７ａの磁極面に電磁吸引力を発生させて可動鉄心５８を吸引揺動させるのである。つまり、固定鉄心５７にコイル６８を巻装することで第１の電磁釈放装置４７Ｂを構成する固定鉄心５７，可動鉄心５８，板ばね５９を漏電保護用の第３の電磁釈放装置４８に兼用することができるから、各極毎の大電流保護用の電磁釈放装置と漏電保護用の電磁釈放装置とを独立した部品で構成していた従来に比較して、部品点数を削減することができて省スペース化並びに小型化が図れるものである。
【００５２】
また、固定鉄心５７と可動鉄心５８との間におけるコイル６８並びに通電導体８０（内片８０ａ）の通電方向が一致するため、コイル６８に通電されて第３の電磁釈放装置４８が動作した場合に固定鉄心５７の両側片５７ａ，５７ａの磁極面に発生する電磁吸引力を強めることができ、主接点を素早く開極させることができる。さらにコイル６８を固定鉄心５７に巻装しているため、コイル６８が移動しないことからコイル６８の断線を防ぐことができる。但し、可動鉄心５８にコイル６８を巻装してもよい。
【００５３】
漏電保護回路５１は図８に示す回路構成を有するものであって、主回路の電圧極の電路（編組線７９Ａ）と中性極又は他方の電圧極の電路（編組線７９Ｂ）が貫挿された零相変流器ＺＣＴを備え、地絡電流等の漏洩電流によって主回路の各極に流れる電流が不平衡となると零相変流器ＺＣＴの出力端子間に不平衡度合いに応じた電流（検出電流）が流れる。この検出電流は交番電流であって、逆並列に接続したダイオードＤ１，Ｄ２からなるクランプ回路でクランプされ、抵抗Ｒ１を介して平滑コンデンサＣ１を充電することにより検出電流を電圧に変換する。そして、平滑コンデンサＣ１の両端電圧、すなわち検出電流から変換された検出電圧が漏洩電流判定回路５１ａに入力される。
【００５４】
漏洩電流判定回路５１ａの電源は、端子ピン６９ｄから第３の電磁釈放装置４８のコイル６８を通して、ダイオードＤ３、抵抗Ｒ２〜Ｒ５、平滑コンデンサＣ２の直列回路を主回路の２つの極の間に接続し、平滑コンデンサＣ２の両端電圧を漏洩電流判定回路５１ａの電源端子及び接地端子に印加することで得られる。また、主回路の２つの極の間には、コイル６８とサイリスタＳＣＲとダイオードＤ３の直列回路が接続され、漏洩電流判定回路５１ａの出力端子から出力する制御信号をサイリスタＳＣＲのゲートに印加することでサイリスタＳＣＲをターンオンさせる。なお、サイリスタＳＣＲの両端間にはコンデンサＣ０と抵抗Ｒ０からなるフィルタ回路が接続されている。
【００５５】
漏洩電流判定回路５１ａは、上記検出電圧を所定の閾値と比較し、比較結果に応じてコンデンサＣ３を充電又は放電し、コンデンサＣ３の両端電圧に応じて出力端子から制御信号を出力することによって比較結果を遅延するように構成してある。したがって、主回路に漏洩電流が流れると制御信号によってサイリスタＳＣＲがターンオンし、コイル６８に通電されることによって第３の電磁釈放装置４８が動作し、可動鉄心５８が固定鉄心５７に吸引される。漏洩電流判定回路５１ａは集積回路よりなり、上記コンデンサＣ３並びに漏電検出後にコンデンサＣ３を放電するための時定数を決める抵抗Ｒ６が外付けされる。
【００５６】
また、主回路の２つの極の間には、抵抗ＲＴ、常開のテストスイッチＳＷ並びに零相変流器ＺＣＴに貫挿されたリード７０ａの直列回路からなる試験回路７０が接続される。すなわち、テストスイッチＳＷをオンしてリード７０ａに電流を流すことにより零相変流器ＺＣＴの１次側に不平衡電流を流して擬似的に漏電状態を作り出し、漏電保護回路５１が正常に動作するか否かの試験を行うことができる。なお、抵抗ＲＴ並びにテストスイッチＳＷにはサージ吸収素子ＳＡが並列に接続してある。
【００５７】
ところで、漏電保護回路５１並びに試験回路７０を構成する上記複数種の回路部品は、図９に示すようにプリント配線基板からなる第１及び第２の回路基板７３，７４に実装される。第１の回路基板７３には図８の回路図中に点線で示した境界線Ｗから左側の強電系の回路を構成する強電系の回路部品（抵抗Ｒ２，Ｒ３、ダイオードＤ３、試験回路７０、フィルタ回路等）が実装され、第２の回路基板７４には境界線Ｗから右側の弱電系の回路を構成する弱電系の回路部品（漏洩電流判定回路５１ａ、クランプ回路、平滑コンデンサＣ１、零相変流器ＺＣＴ等）並びにサイリスタＳＣＲが実装される。テストスイッチＳＷは、一端が第１の回路基板７３に接合されて揺動自在に支持された可動接点板７６ａと、可動接点板７６ａに対向するように第１の回路基板７３に実装されたピン状の固定接点７６ｂとで構成され、可動接点板７６ａの自由端側の上部に移動自在に配設されるテスト釦７８を押操作している場合に、テスト釦７８に押駆動された可動接点板７６ａが固定接点７６ｂに接触してオンするものである。
【００５８】
零相変流器ＺＣＴは、図９に示すように巻線（図示せず）を巻回したリング形のコア（図示せず）を合成樹脂成型品のハウジング７５に納装したものであって、コアの軸方向に対向するハウジング７５の側面端部から突出する一対の出力端子７５ａが第２の回路基板７４の上部に設けた切り欠き７４ａ，７４ａに挿通され、ハウジング７５を第２の回路基板７４の表面にほぼ密着させた状態で出力端子７５ａを裏面の配線パターン（図示せず）に半田付けして実装される。
【００５９】
また、零相変流器ＺＣＴのハウジング７５には、図９に示すように第１及び第２の回路基板７３，７４を取り付けるための複数の取付部たるコンタクトピン６７₁〜６７₅が軸方向の両側面より突設されている。これらのコンタクトピン６７₁〜６７₅は金属製であってその軸方向を零相変流器ＺＣＴの軸方向に一致させ且つ両端部をハウジング７５の側面から各々突出させてハウジング７５にインサート成型され、第１の回路基板７３と対向する側面側にはコンタクトピン６７₁〜６７₅をその先端部を残して被うボス部７５ｃがハウジング７５と一体に形成されている。
【００６０】
一方、第１及び第２の回路基板７３，７４には各コンタクトピン６７₁〜６７₅を挿通するスルーホール７３ａ，７４ｂがそれぞれ穿孔されており、各スルーホール７３ａ，７４ｂに挿通したコンタクトピン６７₁〜６７₅の端部を配線パターンに接合することにより、第１及び第２の回路基板７３，７４が零相変流器ＺＣＴの厚み方向（軸方向）の両側面に振り分けて取り付けられる。このとき、コンタクトピン６７₁〜６７₄が２つの回路基板７３，７４間の通電路を兼ね、コンタクトピン６７₁〜６７₅を介して第１及び第２の回路基板７３，７４に実装された回路部品が電気的に接続される。また、第１の回路基板７３の下部には第３の電磁釈放装置４８を構成する端子ピン６９ｄがそれぞれ挿通されるスルーホール７３ｂが穿孔されており、各スルーホール７３ｂに挿通した端子ピン６９ｄの端部を配線パターンに接合することでコイル６８が漏電保護回路５１に電気的に接続される。さらにハウジング７５の中央に開口する貫通孔７５ｂの近傍にコンタクトピン６７₅が設けてあり、このコンタクトピン６７₅が零相変流器ＺＣＴのコアを貫挿する試験回路７０のリード７０ａとなる。なお、第１及び第２の回路基板７３，７４にはハウジング７５の貫通孔７５ｂに連通して編組線７９Ａ，７９Ｂが挿通される円形の挿通孔７３ｃ，７４ｃが設けてある。また、第１の回路基板７３には導電板７１Ａを介して主回路の一方の極（固定接点２Ａ及び可動接点３Ａの主接点を有する極）に接続するリード線８２Ａの一端と、主回路の他方の極（固定接点２Ｂ及び可動接点３Ｂの主接点を有する極）に接続するための接続部材９９に一端が溶着されたリード線８２Ｂの他端とが接続されている。
【００６１】
而して、漏電保護回路５１を構成する複数種の回路部品を第１及び第２の回路基板７３，７４に実装し、零相変流器ＺＣＴの厚み方向両側に第１及び第２の回路基板７３，７４を配置して器体１に収納するため、従来のように１枚の回路基板に漏電保護回路５１と零相変流器ＺＣＴを実装する場合に比較して各回路基板７３，７４の長手方向の寸法を小さくでき、器体１の小型化が図れるものである。また、零相変流器ＺＣＴのハウジング７５に取付部たるコンタクトピン６７₁〜６７₅を設けることにより、第１及び第２の回路基板７３，７４に零相変流器ＺＣＴを容易に取り付けることができる。さらに、取付部を金属製のコンタクトピン６７₁〜６７₄とし、第１及び第２の回路基板７３，７４間を電気的に接続する通電路としているので、別途リード線等を用いて配線する場合に比較して回路基板７３，７４間の通電路が簡単に形成できるという利点があり、しかもコンタクトピン６７₁〜６７₅をハウジング７５にインサート成型することで零相変流器ＺＣＴの巻線と絶縁することができる。
【００６２】
また、コンタクトピン６７₅を試験回路７０のリード７０ａとしているため、第１及び第２の回路基板７３，７４を零相変流器ＺＣＴに取り付けることで試験回路７０のリード７０ａを零相変流器ＺＣＴのコアに簡単に貫挿させることができる。さらに、第１の回路基板７３には強電系の回路を構成する強電系の回路部品を実装し、第２の回路基板７４には主に弱電系の回路を構成する弱電系の回路部品を実装しているため、強電系に比較して絶縁距離を短くできる弱電系の回路部品を主に実装した第２の回路基板７４により多くの回路部品を実装することができる。ここで、主回路の一方の極に接続するためのリード線８２Ａと他方の極に接続するためのリード線８２Ｂが強電系の回路部品を実装した第１の回路基板７３に接続してあるため、第２の回路基板７４においてはリード線８２Ａ，８２Ｂの接続位置からの絶縁距離を考慮せずに回路部品を配置することができるという利点がある。
【００６３】
而して、本実施形態の漏電遮断器を組み立てるに当たっては、まず第１側ケース１Ａの凹部８に端子ブロック１０Ａを収納するとともに解除ハンドル１７を復帰ばね２１とともに定位置に組み込む。またハンドル６を所定位置にねじりばね３６とともに組み込む。そして、クロスバー４０を、切溝５４に可動接触子４Ａを嵌め込むとともにコイルばね５３を凹部内に収納し、第１側ケース１Ａの所定位置にコイルばね６２とともに回動自在に配置する。また作動板４３をリンク４４でハンドル６と連結させて配設する。
【００６４】
さらに、器体１の他端底部に設けた収納部９０に固定端子Ｔ１を収納するとともに、スライド部材８３と一緒に選択端子Ｔ２を、第２側ケース１Ｂと突き合わせたときに構成される内方収納部２００に対応する第１側ケース１Ａの内側の区画に収納する。またスライド部材８３の脚片８３ａを挿通孔を介して第１側ケース１Ａの側壁の外側面に形成せるスライド溝に入れて突出部２０６を外部に露出させる。
【００６５】
さらに、内方収納部２００に沿って第１側ケース１Ａの高さ方向に形成された分離壁９１と、第１側ケース１Ａの長手方向略中央で分離壁９１に対向して高さ方向に形成された分離壁６５との間の空間上部に、長手方向の寸法が長い第２の回路基板７４を隔壁９１側として零相変流器ＺＣＴに取り付けた第１及び第２の回路基板７３，７４を収納するとともに、上記空間下部に第１及び第３の電磁釈放装置４７Ｂ，４８を収納する。ここで、第１側ケース１Ａ底部の隔壁９１近傍の部位には器体１の幅方向に沿って２条のリブ９２が設けてあり、この２条のリブ９２間に形成される嵌合溝９２ａに第２の回路基板７４の下端部を嵌合することにより、その長手方向が第１側ケース１Ａの高さ方向と略一致し且つ零相変流器ＺＣＴの軸方向が第１側ケース１Ａの長手方向と略一致するように第２の回路基板７４を位置決め固定している。
【００６６】
また、両側ケース１Ａ，１Ｂの零相変流器ＺＣＴと対向する側壁に矩形の窓孔９８をそれぞれ開口し、ハウジング７５の幅寸法が最も大きい部分を窓孔９８に挿入してハウジング７５の逃げとしている。すなわち、零相変流器ＺＣＴのハウジング７５の幅寸法が第１及び第２の回路基板７３，７４の幅寸法よりも若干大きいために器体１の幅寸法をハウジング７５の幅寸法に合わせると無駄なスペースが生じてしまうが、上述のように窓孔９８を設けてハウジング７５を逃がすことにより、無駄なスペースが生じるのを防いで器体１の幅寸法の小型化が図れる。但し、窓孔９８に挿入したハウジング７５が両側ケース１Ａ，１Ｂの側壁外側面よりも突出しないようにハウジング７５並びに器体１の幅寸法を設定している。
【００６７】
一方、第１及び第３の電磁釈放装置４７Ｂ，４８は、図１１に示すように可動鉄心５８を器体１の高さ方向において下にして上記空間下部の第１側ケース１Ａ底部に配置され、器体１の高さ方向における固定鉄心５７の上部に零相変流器ＺＣＴが配置されている。このように板ばね５９で連結した固定鉄心５７及び可動鉄心５８を器体１の高さ方向にそって器体１底部に配置するとともに、固定鉄心５７及び可動鉄心５８の上部に、軸方向を器体１の長手方向に略一致させて零相変流器ＺＣＴを配置すれば、固定鉄心５７及び可動鉄心５８に挟まれる通電導体８０をその延出方向を器体１の長手方向に一致させて器体１内に配設することができるために器体１の高さ方向の寸法を小型化することができる。また、固定鉄心５７及び可動鉄心５８の高さ方向上部に零相変流器ＺＣＴを配置することで器体１の長手方向の寸法を小型化することができる。さらに、零相変流器ＺＣＴの軸方向を器体１の長手方向と一致させているから、主回路の電路（編組線７９Ａ，７９Ｂ）を零相変流器ＺＣＴに貫通させる作業が容易に行える。あるいは、予め編組線７９Ａ，７９Ｂを零相変流器ＺＣＴに貫通させた状態で第１側ケース１Ａに組み込む場合には、器体１内で編組線７９Ａ，７９Ｂを引き回す距離が短くて済む。しかも、可動鉄心５８を器体１の底部側に配置しているため、可動鉄心５８の吸引動作に零相変流器ＺＣＴの影響が及ばず、後述する主接点の開極特性を安定させることができる。
【００６８】
ここで、外片８０ｂの先端部に後端部が連結された可動接触子４Ｂは、その中央部の斜め上向きの傾斜部位を、第１側ケース１Ａの底部よりやや上方に位置する分離壁６５の下端より第１側ケース１Ａの他端部方向へ底部に平行し、さらにこの平行部より上向きに傾斜して延長された隔壁９５と第１側ケース１Ａの底部との間に配置して、可動接触子４Ｂの自由端側を隔壁１４の切欠部１４ａを介して固定接触子１２Ｂが配置される空間に配設される（図２参照）。このとき隔壁９５の平行部の下面と第１側ケース１Ａの底部とにそれぞれ突設した複数のリブ９６で可動接触子４Ｂの後端部を挟んで固定する。またこのとき第１側ケース１Ａの底部と可動接触子４Ｂとの間に、第１の回路基板７３とリード線８２Ｂで接続された接続部材９９を挟持固定して漏電保護回路５１並びに試験回路７０を片方の極の電路に接続している。
【００６９】
さらに分離壁６５と隔壁９５との間の空間に、導電板７１Ａ，７１Ｂ並びにバイメタル４５，４６を保持させた隔壁部材３１を収納する。このとき隔壁部材３１の下部周壁３１ｂの斜め上向きに傾斜した傾斜部位を隔壁９５の傾斜部位に沿うように載置することにより、隔壁部材３１を器体１の上記空間内で位置決めしている。而して、器体１の長手方向においてバイメタル４５，４６に近い側に第１の回路基板７３が配置されることになるため、第２の回路基板７４とバイメタル４５，４６との距離を離して第２の回路基板７４に実装したＩＣ（漏洩電流判定回路５１ａ）等の熱に弱い弱電系の回路部品にバイメタル４５，４６の発する熱の影響が及ぶのを抑えることができる。
【００７０】
さらにまた固定鉄心６０を凹所３１ｃ内に配置した後に第１引外し板４１をねじりばね８１とともに定位置に回動自在に配置するとともに、第２引外し板４２を定位置に回動自在に配置する。このとき第２引外し板４２の受け部４２ｃが可動鉄心５８の先端部と対向する。
【００７１】
このようにして図１１に示すように中間ケース７及びこの中間ケース７の凹部９内に収納する端子ブロック１０Ｂ、解除ハンドル１７’及びその復帰ばね２１’以外を第１側ケース１Ａ側に配置、組み付けた後に、端子ブロック１０Ｂ、解除ハンドル１７’及び復帰ばね２１’を凹部９に組み付けた中間ケース７を第１側ケース１Ａ側に重ねるように配設する。
【００７２】
ここで中間ケース７を第１側ケース１Ａ側の定位置に配設すると、可動接触子４Ａの自由端側が縦壁の開口部を介して凹所内に配置されるとともに、端子ブロック１０Ａに設けられた固定接触子１２Ａの先端側部が底壁の段面上に載置されることになるとともに軸が解除ハンドル１７の凹部３７に嵌まることになる。
【００７３】
一方端子ブロック１０Ｂに設けられた固定接触子１２Ｂが第１側ケース１Ａの底部上のリブ２６上に載置される。また中間ケース７の端部に形成せる下向き段部の下面が第１側ケース１Ａの端部壁に形成した平坦面上に載置される。
【００７４】
この状態で第２側ケース１Ｂを第１側ケース１Ａ側に重ね合わせて結合するのである。このとき第１側ケース１Ａから第２側ケース１Ｂ側へ一体突出させた両端上下の４カ所の弾性係止片１００の先端の爪状の引掛係止部１０１が第２側ケース１Ｂ側に対応して設けた突起状の被引掛部１０２に係止されて第１側ケース１Ａと第２側ケース１Ｂとが結合固定されて器体１を構成することになる（図１１等参照）。この第１側ケース１Ａと第２側ケース１Ｂの結合固定を外す場合には、第２側ケース１Ｂに各被引掛部１０２に対応させて開口した各解除孔１５０よりドライバを挿入して対応する各弾性係止片１００の引掛係止部１０１を上方へ押圧して、被引掛部１０２との引掛状態を外すことにより、第１側ケース１Ａから第２側ケース１Ｂを外すことができる。
【００７５】
第２側ケース１Ｂを被着することにより第２側ケース１Ｂの内側面に設けてある軸孔５２，５６にクロスバー４０の軸４０ａ、第１引外し板４１の軸部４１ａが回動自在に挿入される。
【００７６】
また各バイメタル４５，４６に対応する調整螺子７７，７７’の頭部は、隔壁部材３１の切り欠き３１ｅを通して器体１の上面に開口する開口部１０４に臨むことになり、組立後の動作試験時に最適な動作点が得られるように開口部１０４を介して動作調整螺子７７，７７’を螺進させ、バイメタル４５の先端部とクロスバー４０の脚部４１ｃ並びにバイメタル４６の先端部と第２引外し板４２の駆動片４２ｄとの間隔を調整し、その調整後に、蓋１０６をその弾性を利用して器体１の開口部１０４周縁の部位に嵌め込んで開口部１０４を被蔽する。
【００７７】
ここでバイメタル４５，４６は、隔壁部材３１に保持された状態で器体１の幅方向を幅方向として並設され、器体１の幅方向の寸法の小型化を図っている。また変位方向を互いに器体１の長手方向に沿って第２の回路基板７４及び第１及び第３の電磁釈放装置４７Ｂ，４８から遠ざかる向きに設定しているため、バイメタル４５，４６と第１及び第３の電磁釈放装置４７Ｂ，４８並びに零相変流器ＺＣＴ（第２の回路基板７４）との間隔を狭くして器体１の長手方向の小型化が図れる。
【００７８】
またバイメタル４５，４６の間を隔壁部材３１の隔壁３１ａで隔絶するため、隔壁３１ａによって両バイメタル４５，４６間の絶縁を図るとともにその間隔を狭くすることができる。さらに零相変流器ＺＣＴを器体１の幅方向に隔壁３１ａを跨ぐように配置することにより、各バイメタル４５，４６に接続される編組線７９Ａ，７９Ｂを零相変流器ＺＣＴに貫通させ易くしている。またさらに固定鉄心５７及び可動鉄心５８を含む第１及び第３の電磁釈放装置４７Ｂ，４８も器体１の幅方向に隔壁３１ａを跨ぐように配置しているから、固定鉄心５７並びに可動鉄心５８の幅寸法を充分に大きくすることができ、電磁吸引力を増大させて主接点の開極に要する時間を短くすることができる。
【００７９】
さらに本実施形態では、第１の電磁釈放装置４７Ｂを、器体１内における第２の電磁釈放装置４７Ａの固定鉄心６０側に、可動鉄心５８の動作方向（図１における上下方向）が第２の電磁釈放装置４７Ａにおける可動鉄心６１の動作方向（図３における左右方向）と略直交するように収納し、第１及び第２の電磁釈放装置４７Ｂ，４７Ａの固定鉄心５７，６０に対向する器体１内の位置に零相変流器ＺＣＴを含む漏電保護回路５１の回路ブロックを配置しているので、第１及び第２の電磁釈放装置４７Ｂ，４７Ａの可動鉄心５８，６１や引外し部材（第１引外し板４１及び第２引外し板４２）の動作スペースを十分に確保することができるとともに器体１内のスペースを有効に利用できて一層の小型化が図れるという利点がある。
【００８０】
而して器体１の他端内部の内方収納部２００及び収納部９０には選択端子Ｔ２、固定端子Ｔ１がそれぞれ収納され、またこれら端子Ｔ１，Ｔ２に対応するように器体１の一端部には器体１の端面と両側面とに亘るように開口した差込部２０９ａ〜２０９ｃが形成されることになる。さらに器体１の一端部には斜め上向きに開口した一対の電線挿入孔１６Ａ，１６Ｂが並行形成される。
【００８１】
よって、電線挿入孔１６Ａ，１６Ｂにそれぞれ負荷側の電線を挿入して各端子ブロック１０Ａ，１０Ｂに接続し、電圧極の導電バーを差込部２０９ｃを介して幅方向に固定端子Ｔ１に差込接続し、中性極又は他方の電圧極の導電バーを差込部２０９ａ又は２０９ｂを介して選択端子Ｔ２に幅方向に差込接続すれば電路に本実施形態の漏電遮断器を挿入することができることになる。
【００８２】
ところで、図１に示すように第２側ケース１Ｂの開口部１０４近傍にはテスト釦７８を挿通する挿通孔１０５ａが貫通した突台部１０５が設けてあり、先端を二股に形成したテスト釦７８を上方から挿通孔１０５ａに挿通して係止段部７８ａを器体１内の挿通孔１０５ａ周縁に係止することでテスト釦７８が器体１の高さ方向に移動自在且つ抜け止めして突台部１０５に取り付けられる。このテスト釦７８の先端部が第２の回路基板７４に実装したテストスイッチＳＷの可動接点板７６ａと対向しており、テスト釦７８を押操作することでその先端部にて可動接点板７６ａを押駆動して固定接点７６ｂに接触させ、テストスイッチＳＷをオンさせることができる。なお、蓋１０６にはテスト釦７８との干渉を避けるためにテスト釦７８が挿通する半円形の切り欠き１０６ａが設けてある。
【００８３】
ここで、器体１両側面には零相変流器ＺＣＴのハウジング７５が部分的に露出する窓孔９８が開口しているので、窓孔９８から器体１内への異物侵入を防止するとともに外観上の見栄えを良くするために、絶縁性を有するシート状の材料で角筒状に形成された絶縁シート（図示せず）を器体１に取着して窓孔９８を覆い隠している。
【００８４】
次に本実施形態の動作を図２，図３並びに図１２〜図１５を参照して説明する。図１２及び図１３は開放状態を示しており、この開放状態ではハンドル６の操作部６ａが窓孔５０より倒立露出した状態にあり、作動板４３の一端と第１引外し板４１との係合状態は外れた状態にある。そしてコイルばね６２によりクロスバー４０は図１２において時計回り（図１３においては反時計回り）に回動するように付勢されており、クロスバー４０の切溝５４に貫挿されている可動接触子４Ａが自由端を上方に移動させた状態にあり、また切溝５５に貫挿させた可動接触子４Ｂはそのばね弾性力により自由端を上方に移動させた状態にあり、夫々の自由端に設けてある可動接点３Ａ，３Ｂが対応する固定接点２Ａ，２Ｂから開離した状態にある。
【００８５】
この状態でハンドル６の操作部６ａを図１２における時計回り（図１３における反時計回り）に回動操作すると、リンク４４の上側軸４４ａが下方向に押し動かされてリンク４４は下側軸４４ｂにより作動板４３を押し下げる。この作動板４３の押し下げにより作動板４３の一端（図１２において右端）が第１引外し板４１の係止部４１ｅに当たり、その位置を回動中心として作動板４３は図１２において反時計回り（図１３において時計回り）に回動し、作動板４３の他端（図１２において左端）がクロスバー４０の上端に設けてある突出部８４に当たり、クロスバー４０を図１２において反時計回り（図１３において時計回り）にばね付勢に抗して回動させる。
【００８６】
この回動によりクロスバー４０の切溝５５に貫挿された可動接触子４Ｂが自由端を下向きに移動させる方向に撓むことになり、自由端の可動接点３Ｂを固定接点２Ｂに接触させる。また切溝５４に貫挿された可動接触子４Ａが図１２において反時計回り（図１３において時計回り）に回動してその自由端の可動接点３Ａを固定接点２Ａに接触させる。この接触は可動接点３Ｂが固定接点２Ｂに接触するよりも遅れるようなっている。
【００８７】
そしてハンドル６をさらに回動させると、リンク４４の下側軸４４ｂの位置とハンドル６の回転中心を結ぶ線より上側軸４４ａが図２に示すように左方向（図３においては右方向）に移動し、この状態でハンドル６のねじりばね３６、クロスバー４４を付勢するコイルスばね６２、更に可動接触子４Ｂのばね力等が均衡して作動板４３の一端と第１引外し板４１の係止部４１ｅとのラッチ状態が保持され、図２及び図３の投入状態が維持される。
【００８８】
さて投入状態でハンドル６の操作部６ａを図２において反時計回り（図３において反時計回り）に回動させると、リンク４４の上側軸４４ａの位置が、ハンドル６の回転中心と、下側軸４４ｂを結ぶ線を図２において右方向（図３において左方向）に越えて上方へ移動するため作動板４３の図２における右端（図３における左端）と第１引外し板４１の係止部４１ｅとのラッチ状態が解かれ、クロスバー４０はコイルばね６２の付勢力で図２において時計回り（図３において反時計回り）に回動するとともに、ハンドル６がねじりばね３６の付勢力でオフ側に急速に回動復帰する。クロスバー４０の図２における時計回り（図３における反時計回り）への回動により可動接触子４Ａが図２における時計回り（図３における反時計回り）に回動して自由端を上方へ移動させ可動接点３Ａを固定接点２Ａより開離させる。また可動接触子４Ｂが下向きの押し下げが無くなって、そのばね力で元の状態に復帰することになり、自由端の可動接点３Ｂを固定接点２Ｂより開離する。この開離は上記可動接点３Ａが固定接点２Ａから開離するよりも遅れる。この遅れは後述する強制開極時も同様である。
【００８９】
ここで上記のように両極の主接点の開閉に上記のように遅れを持たせているため接点開閉時に生じるアークは剛体側の可動接触子４Ａのみとなり、ばね材からなる可動接触子３Ｂのアークによる消耗を防止できる。
【００９０】
さらに主接点の開離時に回動するクロスバー４０の先端面の幅方向に形成した凹溝１３１に両ケース１Ａ，１Ｂ及び中間ケース７に形成した止片１３０…が係入して凹溝１３１の底部に当接するため、一方の区画で発生したアークが器体１の奥側のクロスバー４０側から回りこんで他の区画へ入り込む恐れを無くして、器体１内部でのアークによる極間短絡を防止する。
【００９１】
さて図２及び図３に示す上記投入状態において、負荷に過電流が流れると、バイメタル４５，４６は過電流により発熱して湾曲変位することになる。ここで上方から垂下したバイメタル４５，４６は下端が図２において左方向（図３において右方向）に移動するように変位し、バイメタル４６の下端は第２引外し板４２の駆動片４２ｄを図２における左方向に押し、バイメタル４５の下端は第１引外し板４１の脚部４１ｃ先端の受け部４１ｇを図３における右方向に押す。そしてバイメタル４６の変位によって第２引外し板４２が図２における反時計回りに回動し、第２引外し板４２の対向部４２ａが第１引外し板４１の受け部４１ｆを左方向に押す。そして、第１引外し板４１は受け部４１ｇがバイメタル４５に押されるとともに受け部４１ｆが第２引外し板４２に押されることで図２において時計回り（図３において反時計回り）に回動する。
【００９２】
さて第１引外し板４１が図２において時計回り（図３において反時計回り）に回動すると、係止部４１ｅと作動板４３の一端（図２における右端）とのラッチ状態が解除され、作動板４３はリンク４４の下側軸４４ｂを中心として図２において時計回り（図３において反時計回り）に回動することになる。そのため作動板４３の他端（図２における左端）によるクロスバー４０の規制が無くなり、クロスバー４０はコイルばね６２のばね力により図２において時計回り（図３において反時計回り）に回動し、可動接触子４Ａ，４Ｂを開放状態に復帰させ、可動接点３Ａ，３Ｂを固定接点２Ａ，２Ｂからそれぞれ開離させる。すなわち、主回路に過負荷電流が流れた場合には、熱動釈放装置によって開閉機構５が釈放されて主接点を強制的に開極して負荷を保護することができる。
【００９３】
その後、電路遮断によりバイメタル４５，４６は元の状態に戻り、第１引外し板４１はねじりばね８１の付勢により元の位置へ回動復帰し、同時に第２引外し板４２の対向部４２ａを受け部４１ｆが押し動かして第２引外し板４２を元へ戻す。またハンドル６はねじりばね３６の付勢により開放方向（図２における反時計回り）に回動することになる。
【００９４】
また上記投入状態において、地絡事故や短絡事故による異常な大電流が一方の極の通電導体８０に流れると、固定鉄心５７に電磁吸引力が発生して可動鉄心５８を吸引して揺動させる。これにより図１４に示すように、可動鉄心５８の先端部が第２引外し板４２の受け部４２ｃを押し上げて第２引外し板４２を反時計回りに回動させる。過負荷電流が流れたときと同様に第２引外し板４２が反時計回りに回動すると、第２引外し板４２の対向部４２ａが第１引外し板４１の受け部４１ｆを左方向に押して時計回りに回動する。そして、第１引外し板４１が時計回りに回動すると、係止部４１ｅと作動板４３の一端（右端）とのラッチ状態が解除され、作動板４３はリンク４４の下側軸４４ｂを中心として時計回りに回動することになる。そのため作動板４３の他端（左端）によるクロスバー４０の規制が無くなり、クロスバー４０はコイルばね６２のばね力により時計回り（図１５においては反時計回り）に回動し、可動接触子４Ａ，４Ｂを開放状態に復帰させ、可動接点３Ａ，３Ｂを固定接点２Ａ，２Ｂからそれぞれ開離させる。すなわち、主回路の一方の極（固定接点２Ｂ及び可動接点３Ｂ）に異常な大電流が流れた場合には、第１の電磁釈放装置４７Ｂによって開閉機構５が釈放されて主接点を強制的に開極することができる。
【００９５】
その後、電路遮断により固定鉄心５７に電磁吸引力が発生しなくなると、可動鉄心５８は板ばね５９のばね力により元の状態に戻り、第１引外し板４１はねじりばね８１の付勢により元の位置へ回動復帰し、同時に第２引外し板４２の対向部４２ａを受け部４１ｆが押し動かして第２引外し板４２を元へ戻す。またハンドル６はねじりばね３６の付勢により開放方向（反時計回り）に回動することになる。
【００９６】
一方上記投入状態において、地絡事故や短絡事故による異常な大電流が他方の極のバイメタル４５に流れると、固定鉄心６０に電磁吸引力が発生して可動鉄心６１を吸引して揺動させる。これにより、可動鉄心６１が取着されている第１引外し板４１が図１５における反時計回りに回動し、係止部４１ｅと作動板４３の一端（左端）とのラッチ状態が解除され、作動板４３はリンク４４の下側軸４４ｂを中心として反時計回りに回動することになる。そのため作動板４３の他端（右端）によるクロスバー４０の規制が無くなり、クロスバー４０はコイルばね６２のばね力により反時計回りに回動し、可動接触子４Ａ，４Ｂを開放状態に復帰させ、可動接点３Ａ，３Ｂを固定接点２Ａ，２Ｂからそれぞれ開離させる。すなわち、主回路の他方の極（固定接点２Ａ及び可動接点３Ａ）に異常な大電流が流れた場合には、第２の電磁釈放装置４７Ａによって開閉機構５が釈放されて主接点を強制的に開極することができる。
【００９７】
その後、電路遮断により固定鉄心６０に電磁吸引力が発生しなくなると、第１引外し板４１はねじりばね８１の付勢により元の位置へ回動復帰する。またハンドル６はねじりばね３６の付勢により開放方向（時計回り）に回動することになる。
【００９８】
さらに上記投入状態において、地絡電流等の漏洩電流が流れると、漏電保護回路５１がコイル６８に通電することにより固定鉄心５７に電磁吸引力が発生して可動鉄心５８を吸引して揺動させる。これにより短絡電流が流れたときと同様、図１４に示すように、可動鉄心５８の先端部が第２引外し板４２の受け部４２ｃを押して第２引外し板４２を反時計回りに回動させるとともに第１引外し板４１を時計回りに回動させ、可動接触子４Ａ，４Ｂを開放状態に復帰させて可動接点３Ａ，３Ｂを固定接点２Ａ，２Ｂからそれぞれ開離させる。すなわち、主回路に漏洩電流が流れた場合には、第３の電磁釈放装置４８によって開閉機構５が釈放されて主接点を強制的に開極して地絡保護ができる。
【００９９】
【発明の効果】
請求項１の発明は、２極の主接点を有した主回路を収納する器体と、少なくとも一部が器体から回動自在に露出するハンドルと、少なくともハンドルの操作に応じて主回路の主接点を開閉する開閉機構と、地絡事故や短絡事故により異常な大電流が主回路の一方の主接点に流れた場合に開閉機構を釈放して主接点を強制的に開極する第１の電磁釈放装置と、前記異常大電流が主回路の他方の主接点に流れた場合に開閉機構を釈放して主接点を強制的に開極する第２の電磁釈放装置と、漏洩電流を検出する漏洩電流検出手段と、漏洩電流検出手段にて漏洩電流が検出されると開閉機構を釈放して主接点を強制的に開極する第３の電磁釈放装置とを備え、第１及び第２の電磁釈放装置は、主回路を形成する各極の通電導体を固定鉄心との間に挟む形で固定鉄心に揺動自在に接離する可動鉄心をそれぞれ具備し可動鉄心が固定鉄心に吸引された場合に開閉機構を釈放してなり、第３の電磁釈放装置は、第１の電磁釈放装置が具備する固定鉄心にコイルを巻装してなり、前記開閉機構は、主接点を閉極状態にラッチさせるラッチ部材と、主接点を開極状態へ移行させるラッチ部材の動きを規制するとともに第１〜第３の電磁釈放装置により前記規制が解除される引外し部材とを具備し、第２の電磁釈放装置が具備する可動鉄心を前記引外し部材に取着してなる漏電遮断器であって、第１の電磁釈放装置を、器体内における第２の電磁釈放装置の固定鉄心側に、可動鉄心の動作方向が第２の電磁釈放装置における可動鉄心の動作方向と略直交するように収納し、第１及び第２の電磁釈放装置の固定鉄心に対向する器体内の位置に漏洩電流検出手段を配置したので、第１の電磁釈放装置を構成する固定鉄心及び可動鉄心を漏電保護用の第３の電磁釈放装置に兼用することにより、従来に比較して部品点数を削減することができ、各極毎に地絡事故や短絡事故による異常な大電流からの保護を図りつつ、省スペース化並びに小型化が図れるとともに、可動鉄心の動きを引外し部材に伝える部材が不要となり、部品点数をさらに削減でき、且つ可動鉄心と引外し部材との距離を縮めることで一層の小型化が図れ、さらに第１及び第２の電磁釈放装置の可動鉄心や引外し部材の動作スペースを十分に確保することができるとともに器体内のスペースを有効に利用できて一層の小型化が図れるという効果がある。
【図面の簡単な説明】
【図１】実施形態を示す分解斜視図である。
【図２】同上の投入状態を示し、第２側ケースを取り外した状態の側面図である。
【図３】同上の投入状態を示し、第１側ケースを取り外した状態の側面図である。
【図４】同上の背面断面図である。
【図５】同上における第２の電磁釈放装置並びに熱動釈放装置の分解斜視図である。
【図６】同上における第１及び第３の電磁釈放装置の分解斜視図である。
【図７】同上における第１及び第３の電磁釈放装置の斜視図である。
【図８】同上における漏電保護回路並びに試験回路の回路図である。
【図９】同上における零相変流器、第１及び第２の回路基板の構造部位の分解斜視図である。
【図１０】同上における零相変流器、第１及び第２の回路基板の構造部位の斜視図である。
【図１１】同上の背面断面図である。
【図１２】同上の開放状態を示し、第２側ケースを取り外した状態の側面図である。
【図１３】同上の開放状態を示し、第１側ケースを取り外した状態の側面図である。
【図１４】同上の投入状態から第１の電磁釈放装置が動作した状態を示し、第２側ケースを取り外した状態の側面図である。
【図１５】同上の投入状態から第１の電磁釈放装置が動作した状態を示し、第１側ケースを取り外した状態の側面図である。
【符号の説明】
１器体
２Ａ，２Ｂ固定接点
３Ａ，３Ｂ可動接点
５開閉機構
６ハンドル
４７Ｂ第１の電磁釈放装置
４７Ａ第２の電磁釈放装置
４８第３の電磁釈放装置
５７固定鉄心
５８可動鉄心
６０固定鉄心
６１可動鉄心
６８コイル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-pole type earth leakage breaker having a two-pole main contact, and more particularly to an earth leakage breaker having an electromagnetic release device that protects each pole from an abnormal large current due to a ground fault or a short-circuit accident. It is.
[0002]
[Prior art]
As a conventional two-pole type earth leakage breaker, there is one described in Japanese Patent Laid-Open No. 11-25841. This earth leakage breaker is equipped with an electromagnetic release device that releases the switching mechanism and forcibly opens the main contact when an abnormal large current due to a ground fault or short circuit flows to the main contact. In addition to these electromagnetic release devices, the switching mechanism includes a coil that is energized when a leakage current is detected by a zero-phase current transformer disposed on the bottom side of the body. An electromagnetic release device for earth leakage protection that forcibly opens the main contact by releasing the battery is disposed in the container.
[0003]
[Problems to be solved by the invention]
In the above conventional example, when an abnormal large current flows due to a ground fault or a short-circuit accident for each pole, the electromagnetic release device releases the switching mechanism, and the coil is opened / closed by energizing the coil by detecting leakage current. Since there are three independent electromagnetic release devices, ie, an electromagnetic release device for earth leakage protection that releases the mechanism, there is a problem that the number of parts increases and the size of the body increases without saving space. .
[0004]
The present invention has been made in view of the above problems, and its object is to reduce the number of parts while protecting each pole from an abnormal large current due to a ground fault or a short circuit accident. An object of the present invention is to provide an earth leakage circuit breaker that can be reduced in space and size.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a housing that houses a main circuit having a two-pole main contact, a handle that is at least partially pivotably exposed from the housing, and at least a handle. An open / close mechanism that opens and closes the main contact of the main circuit according to the operation of the main circuit, and releases an open / close mechanism when the abnormal large current flows to one main contact of the main circuit due to a ground fault or short circuit accident. A first electromagnetic release device that forcibly opens the contact, and a second electromagnetic release that releases the open / close mechanism and forcibly opens the main contact when the abnormally large current flows to the other main contact of the main circuit. A release device, a leakage current detection means for detecting leakage current, and a third electromagnetic release device for releasing the switching mechanism and forcibly opening the main contact when the leakage current is detected by the leakage current detection means, And the first and second electromagnetic release devices are energized to each pole forming the main circuit. A movable iron core that swingably contacts and separates from the fixed iron core is sandwiched between the fixed iron core and the movable iron core is attracted to the fixed iron core, releasing the opening / closing mechanism, and the third electromagnetic The release device consists of a coil wound around the fixed iron core of the first electromagnetic release device.The opening / closing mechanism restricts the movement of the latch member that latches the main contact to the closed state and the latch member that shifts the main contact to the open state, and the restriction is controlled by the first to third electromagnetic release devices. A leakage breaker comprising: a tripping member to be released; and a movable iron core provided in the second electromagnetic release device is attached to the tripping member, wherein the first electromagnetic release device is disposed in the body. The second electromagnetic release device is housed on the fixed iron core side so that the movement direction of the movable iron core is substantially orthogonal to the movement direction of the movable iron core in the second electromagnetic release device. Leakage current detection means was placed at a position in the container facing the fixed iron coreBy combining the fixed iron core and the movable iron core constituting the first electromagnetic release device with the third electromagnetic release device for leakage protection, the number of parts can be reduced as compared with the prior art. Space saving and miniaturization can be achieved while protecting against abnormally large currents due to ground faults and short circuit accidents for each pole.In addition, a member for transmitting the movement of the movable iron core to the tripping member becomes unnecessary, the number of parts can be further reduced, and the distance between the movable iron core and the tripping member can be further reduced, and further reduction in the size can be achieved. The operation space of the movable iron core and the tripping member of the electromagnetic release device 2 can be sufficiently secured, and the space in the container can be used effectively, and further miniaturization can be achieved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
[0009]
In the present embodiment, two fixings arranged in parallel in the width direction of the container body 1 in the container body 1 configured by connecting the first side case 1A and the second side case 1B made of synthetic resin on both sides. The contacts 2A and 2B, the two movable contacts 4A and 4B, to which the movable contacts 3A and 3B that are detachably opposed to the fixed contacts 2A and 2B are fixed, and the two movable contacts 4A and 4B are driven. The movable contact 3A and 3B are brought into and out of contact with the fixed contacts 2A and 2B through the opening and closing mechanism 5 by the opening and closing operation of the handle 6 (contact / release). The fixed contacts 2A, 2B and the movable contacts 4A, 4B are arranged vertically in the height direction of the body 1, and two fixed contacts 2A in the height direction of the movable contacts 4A, 4B. , 2B, one movable contact 4B and the other movable contact 4A The fixed contact 2A to which the movable contact 3A comes in contact is separated from the fixed contact 2A and 2B at a height position where the movable contact 3A and 3B are not separated from each other when viewed from the width direction of the container 1 with the movable contacts 3A and 3B being separated from each other. It is.
[0010]
An intermediate case 7 molded from a synthetic resin material is fixed in one end portion in the longitudinal direction of the container body 1 so as to be sandwiched between both side cases 1A and 1B, and the inner side wall (outer wall) inside the first side case 1A is fixed. A terminal block 10A constituting an output terminal on the voltage electrode side having a fixed contact 2A provided at one end is accommodated in a section constituted by the concave portion 8 and the vertical wall portion 35 of the intermediate case 7, and the second case of the intermediate case 7 is accommodated. The neutral electrode side or the other voltage electrode side provided with the lower fixed contact 2B at one end in a section constituted by the recess 9 provided on the side case 1B side and the side wall (outer wall) of the second case 1B. The terminal block 10B which comprises an output terminal is accommodated.
[0011]
In the terminal block 10A, an extension piece 11a is integrally extended above a terminal plate 11 bent in a U-shape and one end of a lower piece of the terminal plate 11, and the upper end of the extension piece 11a is perpendicular to the extension piece 11a. A fixed contact 12A that is bent and integrally extended outward with respect to the terminal plate 11, a fixed contact 2A that is caulked and fixed to the upper surface of one end of the fixed contact 12A, and a lower piece of the terminal plate 11 It is comprised with the substantially M-shaped lock spring 13A accommodated in the terminal board 11. FIG. Then, the lower piece of the terminal plate 11 is placed on the bottom inclined surface of the concave portion 8 of the first side case 1A, the extension piece 11a is disposed along the rising wall 8a at one end of the concave portion 8, and the rising wall 8a The fixed contact 12A is led out of the recess 8 beyond the upper end, and is integrally formed between the rising wall 8a and the partition wall 14 rising from the bottom of the first side case 1A in the same manner as the bottom of the recess 8. The terminal block 10 A is disposed in the recess 8 by disposing the tip of the fixed contact 12 A on the fixed contact disposition portion 15. The fixed contact placement portion 15 is formed with a recess 15a that allows the lower end of the fixed contact 2A protruding to the lower surface side of the fixed contact 12A to escape. The terminal plate 11 is formed by integrally extending a T-shaped piece 11b upward from the other end of the upper piece, and one end of a side protruding portion at the upper end of the T-shaped piece 11b is formed on the inner surface of the first side case 1A. It mounts on the upper end surface of the formed convex flat part 22. Further, a protrusion 23 is integrally formed on the side surface of the side piece of the terminal plate 11 to be inserted into the holding piece 13b of the locking spring 13A and prevent the locking spring 13A from rattling.
[0012]
The lock spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion. When the intermediate case 7 is superimposed on the first side case 1A, the vertical wall portion at the other end of the first side case 1A. Inserted from the outside through an oblique downward electric wire insertion hole 16A formed by an oblique downward groove 160 having a semicircular cross section and an oblique downward groove 160 having a similar shape on the wall formed on the opposite wall surface of the intermediate case 7. A core wire of an electric wire (not shown) is press-fitted between the upper piece of the terminal plate 11, the upper end of the locking piece 13a of the locking spring 13A, and the upper end of the holding piece 13b, and the end of the locking piece 13a The core wire is locked with respect to the pulling direction, and the core wire is pressed against the upper piece of the terminal plate 11 at the upper end surface of the pressing piece 13b, whereby the core wire is electrically connected and mechanically held. Yes. The wire lock is released by a release handle 17, and the release handle 17 has a rotary shaft 18 provided on a lower side surface thereof rotated in a shaft hole 20 provided on a convex flat portion 22 on the inner side surface of the first side case 1 A. A shaft (not shown) that is freely pivotally supported and protrudes from the wall surface of the vertical wall portion 35 of the intermediate case 7 is pivotally supported in a recess 37 provided on the other lower side surface. By manually operating and rotating the operating portion 17a exposed to the outside, the drive projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to move the locking piece 13a. It can be bent and the lock on the core wire can be released. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 to rotate in the anti-manual operation direction.
[0013]
On the other hand, the terminal block 10B is basically composed of a terminal plate 11, a lock spring 13B, and a stationary contact 12B, like the terminal block 10A. However, unlike the terminal plate 11 of the terminal block 10A, the terminal block 10B The terminal plate 11 of the block 10B has an extension piece 11c extending downward from one end of the lower piece, and a fixed contact 12B is extended from the tip of the extension piece 11c so as to be parallel to the bottom of the body 1. Further, a back piece 11d extending at a right angle from one end of the side piece of the terminal plate 11 is formed.
[0014]
The lock spring 13B has the same structure as the lock spring 13A, is placed on the lower piece of the terminal plate 11, and a protrusion 23 protruding from the side piece of the terminal plate 11 is inserted into the holding piece 13b. It is like that.
[0015]
The terminal block 10B constitutes the bottom of the concave portion 9 of the intermediate case 7 and places the lower piece of the terminal plate 11 on the lateral wall portion 24 formed so as to extend substantially parallel to the bottom portion of the vessel body 1. The back piece 11d is placed along the vertical wall 25 at one end, and one end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall 24, and the extension piece 11c is recessed. When the intermediate case 7 is superimposed on the first side case 1A side, the tip of the fixed contact 12B, that is, the lower surface provided with the fixed contact 2B is the bottom of the first side case 1A. Are placed on the ribs 26, 26. That is, the fixed contact 2B is disposed across the side cases 1A and 1B in a space formed between the side wall 24 of the intermediate case 7, the bulging portion 30 described later, and the side walls of the side cases 1A and 1B. The recess between the ribs 26 is a relief at the lower end of the fixed contact 2B, which is fixed by caulking to the tip of the fixed contact 12B, protruding from the lower surface side of the fixed contact 12B.
[0016]
Further, the tip of the side projecting portion at the upper end of the T-shaped piece 11 b that extends upward from the other end of the upper piece of the terminal plate 11 is the upper end surface of the convex flat portion 22 ′ formed on the wall surface of the intermediate case 7. Placed on.
[0017]
The lock spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superimposed on the second side case 1B, the intermediate case 7 is provided in the vertical wall at the other end of the second side case 1B in the same manner as the oblique downward groove 160 having a semicircular cross section provided in the vertical wall portion at the other end of the recess 9. When the electric wire is inserted from the electric wire insertion hole 16B formed by the oblique downward groove 160, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is attached to the upper piece of the terminal plate 11 by the pressing piece 13b. The wires are pressed to electrically connect the wires and are mechanically locked.
[0018]
The wire locking is released by a release handle 17 ′. Like the release handle 17, the release handle 17 ′ has a rotating shaft 18 provided on the lower side surface provided on the convex flat portion 22 ′ of the intermediate case 7. A shaft 38 that is pivotally supported in the shaft hole 20 and protrudes from the inner wall surface of the second side case 1B is pivotally supported in a recess 37 formed on a side surface thereof. When the operating portion 17a exposed to the outside is manually operated and rotated, the driving projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13B to bend the locking piece 13a. You can now unlock the locked state. In the figure, reference numeral 21 'denotes a return spring that constantly urges the release handle 17' to rotate in an anti-manual operation direction.
[0019]
The intermediate case 7 is formed with a bulging portion 30 that protrudes toward the second side case 1B with respect to the vertical wall portion 35 substantially parallel to the side walls of the two side cases 1A and 1B and contacts the inner surface of the side wall of the second side case 1B. The wall suspended from the lower surface of the bulging portion 30 is the vertical wall 25, and is a recess surrounded by the side wall, the bottom wall, the vertical wall 32 at one end, and the ceiling wall 33 facing the second side case 1B. Is provided on the first side case 1A side. Then, when the intermediate case 7 is abutted against the first side case 1A side, the front end side portion of the fixed contact 12A of the terminal block 10A assembled on the first side case 1A side is placed on the step surface of the bottom wall of the recess. Further, the ceiling wall 33 is arranged along the lower surface of the lateral wall 29 protruding from the inner surface of the first side case 1A (see FIG. 3). The vertical wall 32 is formed with an opening 39 for inserting the free end of the movable contact 4A corresponding to the fixed contact 2A into the recess.
[0020]
On the other hand, inside the other end in the longitudinal direction of the container body 1, the lowermost step among three conductive bars (not shown) respectively disposed at different positions (vertical direction in FIG. 2) in the distribution board. The storage portion 90 for storing and arranging one fixed terminal T1 for plugging and connecting the conductive bar of the voltage electrode, and either the uppermost neutral electrode or the conductive bar of the other voltage electrode for the plugging connection is selected. An inner storage portion 200 is provided in which one selection terminal T2 is movably disposed between at least two positions corresponding to the conductive bars of the neutral electrode and the other voltage electrodes. That is, in this embodiment, it is possible to selectively correspond to a distribution voltage of 100 V if the selection terminal T2 is connected to the conductive bar of the neutral electrode, and 200 V if the selection terminal T2 is connected to the conductive bar of the other voltage electrode. It is a so-called 100V / 200V combined type.
[0021]
The fixed terminal T1 and the selection terminal T2 are both substantially U-shaped, and are composed of blade receiving springs that expand toward the tip after the tips of both side pieces parallel to the top and bottom are close to each other. It is easy to insert, and the conductive bar is sandwiched between the central adjacent parts.
[0022]
The inner storage portion 200 includes an inner storage portion 200 of the first side case 1A as positioning means for positioning the selection terminal T2 at two positions respectively corresponding to the two conductive bars of the neutral electrode and the voltage electrode. A protrusion 97 having a substantially semicircular cross section is provided in the width direction of the first side case 1A on the end wall surface of the partition to be configured.
[0023]
As a display means for displaying whether the selection terminal T2 is located at a position corresponding to either the neutral electrode or the conductive electrode of the voltage electrode on the wall corresponding to the ceiling part of the inner storage part 200 of the container 1, the inner side Is the columnar display portion 202 formed on the upper portion of the slide member 83 that accommodates the selection terminal T 2 provided in the accommodation portion 200 communicating with the through-hole 201 and can be visually recognized from the outside? The position of the selection terminal T2 can be known depending on whether it is located away from the through hole 201 and cannot be visually recognized from the outside. Further, the slide member 83 can be pushed downward from the outside through the through hole 201 and moved downward. The through-hole 201 is a circular hole formed by abutting a semicircular cut-out hole 201a provided on the upper side walls of the two side cases 1A and 1B.
[0024]
The slide member 83 is formed of a synthetic resin molded product and is formed in a frame shape with both end faces corresponding to both end directions of the container body 1 being opened, and a blade receiving spring constituting the selection terminal T2 is inserted from one end opening. The tip end of the blade receiving spring protrudes from the other end opening, and the selection terminal T2 is disposed so as to be movable in the vertical direction in FIG.
[0025]
A guide groove in the vertical direction in which slide projections 203 formed on both side portions of the slide member 83 are slidably engaged and slid on the inner surfaces of the side walls of both side cases 1A and 1B constituting both side walls of the inner storage portion 200. 204 is formed between two parallel projections 205, and the inner housing portion 200 has the slide member 83 in a state where the slide projections 203 on both sides of the slide member 83 are engaged with the guide grooves 204, 204 on both side walls. At the same time, the selection terminal T2 is stored and held so as to be slidable in the vertical direction. Note that a slide protrusion may be provided on the inner storage portion 200 side, and a guide groove may be provided on the slide member 83 side.
[0026]
As shown in FIG. 1, the slide member 83 is integrally extended with a leg piece 83a extending downward in the drawing as shown in FIG. 1, and protrudes outward from the lower end of the leg piece 83a. A protrusion 206 is formed.
[0027]
The projecting portion 206 is formed on the bottom of the upper end of a slide groove (not shown) formed upward from the bottom surface of the first side case 1A outside the side wall of the first side case 1A constituting the side wall of the inner storage portion 200. It is inserted into a slide groove from an insertion hole (not shown) opened so as to communicate with the inner storage portion 200 and is slidable in the slide groove in the vertical direction together with the leg piece 83a.
[0028]
The slide groove and the insertion hole constitute a guide part for moving the slide member 83 mounted with the selection terminal T2 up and down, and the bottom part of the slide groove is formed so as to protrude into the inner storage part 200. The back surface of the leg piece 83a inserted upward into the slide groove through the insertion hole formed in the upper end bottom of the slide is slidable to the bottom of the slide groove. A protrusion (not shown) that abuts when the protrusion 206 moves to the upper end of the slide groove is provided at the top of the slide groove.
[0029]
Thus, the projecting portion 206 constitutes an operating portion that moves the selection terminal T2 in the inner storage portion 200 up and down, and is held by the projecting portion 206 from the outside of the container 1 or pushed up or down by a driver or the like. When the slide movement is performed in the slide groove, the slide member 83 in the inner storage portion 200 is moved up or down by the guide by the slide protrusion 203 and the guide groove 204 together with the selection terminal T2 along with the slide movement. .
[0030]
When the slide member 83 is moved by the above operation, the upper end or the lower end of the slide member 83 gets over the positioning projection 97 by its elasticity and the rounded surface of the positioning projection 97, and after the movement, the frame portion 83 is moved to the positioning projection 97. The position of the selection terminal T2 is held by hitting the lower end or the upper end of the tip.
[0031]
The opening / closing mechanism 5 that opens and closes the movable contacts 4A and 4B is a first member that includes an operation plate 43 that is a latch member, a crossbar 40, and a stepped locking portion 41e that locks one end of the operation plate 43. It consists of a tripping plate 41, a second tripping plate 42, a handle 6, a U-shaped link 44 and the like. If an abnormal large current flows due to a ground fault or a short circuit accident in a closed state of one main contact (the fixed contact 2B and the movable contact 3B), the other main contact (fixed) is fixed by the first electromagnetic release device 47B. In the closed state of the contact 2A and the movable contact 3A), if an abnormal large current flows due to a ground fault or a short-circuit accident, the second electromagnetic release device 47A causes a leakage protection to flow if a leakage current flows in the main circuit. If an overcurrent such as an overload current further flows through the third electromagnetic release device 48, the open / close mechanism 5 is released by the thermal release device to forcibly open the main contact.
[0032]
The handle 6 includes an operation unit 6a, a rotation unit 6b, and a handle shaft 6c, and a shaft formed on the inner surface of the first case 1A with a handle shaft 6c protruding from the center of both side surfaces of the rotation unit 6b. A hole 49 and a shaft hole 49 formed on the inner side surface of the second side case 1B are rotatably inserted and held between the side cases 1A and 1B. The operating portion 6a is connected to the side cases 1A and 1B. It faces the window hole 50 opened to the upper surface of the container 1 configured in a connected state. Further, a torsion spring 36 is attached to the handle shaft 6c, and the handle 6 is biased by the torsion spring 36 in the opening operation direction at the closing operation position (see FIGS. 2 and 3).
[0033]
An upper shaft 44 a of the U-shaped link 44 is rotatably inserted into a shaft hole 6 d provided at the lower end of the rotating portion 6 b and is connected to the operation plate 43 via the U-shaped link 44.
[0034]
The actuating plate 43 is connected to the handle 6 via the U-shaped link 44 by inserting the lower shaft 44b of the U-shaped link 44 through bearing holes 43a provided on both sides of the center, and moves up and down in the container 1 Arranged freely.
[0035]
The cross bar 40 is inserted into shaft holes 52, 52 formed on the inner side surfaces of both side cases 1A, 1B with shafts 40a projecting on both side surfaces of the upper part, and is pivotally supported between the side cases 1A, 1B. As shown in FIG. 3, the side of the first case 1A slightly below the shaft 40a is provided with a cut groove 54 for fitting the side of the movable contact 4A from the lateral direction, and the lower second as shown in FIG. A cut groove 55 for fitting the movable contact 4B from the lateral direction is provided on the side portion on the side case 1B side. In the movable contact side end face, the stop piece 130 protruding from the inner surface of the side wall of the intermediate case 7 and the first side case 1A is in a state where the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B. A concave groove 131 is formed in the width direction so as to engage with and abut against the bottom (see FIG. 12).
[0036]
Here, the movable contact 4A is composed of a rigid conductive metal plate, and is inserted into the cut groove 54 of the crossbar 40 from the side, and at a recessed portion 40b (see FIG. 3) provided behind the cut groove 54, When the rear part is urged upward by a coil spring 53 for contact pressure that is compressed between the lower surface of the rear part and the bottom part of the recessed part 40b, and the cross bar 40 rotates about the shaft 40a. Further, the movable contact 4A is rotated about the opening edge of the groove 54, and the movable contact 3A, which is caulked and fixed to the free end, is brought into contact with the corresponding fixed contact 2A.
[0037]
The movable contact 4B is made of a conductive spring thin plate material. When the cross bar 40 is rotated in the closing operation direction, the movable contact 4B is pressed downward to be bent, and from this bent state, the cross bar 40 is rotated in the opening operation direction. The movable contact 3B that is caulked and fixed to the tip is brought into contact with and separated from the fixed contact 2B by the return and the bending and the return.
[0038]
The lower end portion of the cross bar 40 is pressed by a coil spring 62 that is compressed between the lower end portion and a wall 63 that is suspended from the bottom portion of the first side case 1 A, so that a rotational force is applied.
[0039]
As shown in FIG. 5, the first tripping plate 41 includes a shaft portion 41a, a protrusion portion 41b protruding above the shaft portion 41a, and a pair of leg portions 41c and 41d protruding below the shaft portion 41a. Thus, both ends of the shaft portion 41a are inserted into shaft holes 56, 56 provided on the inner side surfaces of both side cases 1A, 1B, and are supported rotatably between both side cases 1A, 1B. A locking portion 41e with which one end of the operating plate 43 is engaged and disengaged is formed at the upper end portion of the projecting portion 41b, and a receiving portion 41g that is pushed and driven by a bimetal 45, which will be described later, protrudes from the tip side surface of one leg portion 41c. In addition, a receiving portion 41f that is pushed and driven by the second tripping plate 42 is provided projectingly on the tip side surface of the other leg portion 41d.
[0040]
The second tripping plate 42 is formed in a substantially square shape in which a facing portion 42a and a receiving portion 42c protrude from a central portion having a shaft hole 42b, and a shaft 31f provided on a partition wall member 31 described later is inserted into the shaft hole 42b. And pivotally supported. A driving piece 42d is provided on the end face of the facing portion 42a so as to face the lower end of the bimetal 46 described later and to be pushed when the bimetal 46 is bent.
[0041]
As shown in FIGS. 1 and 5, the conductive plates 71A and 71B made of thick plate metal material have screw holes 71a through which adjustment screws 77 and 77 ′ are screwed on one end side, as shown in FIGS. A pair of caulking shafts 71b are provided so as to project. Then, a pair of holes 72a in which adjustment plates 72 and 72 'made of a thin metal material, each of which is made by hanging and fixing the bimetals 45 and 46 constituting the thermal release device to one end side, are penetrating on the other end side. The caulking shaft 71b is inserted and caulked to be attached to the lower surfaces of the conductive plates 71A and 71B.
[0042]
One end of the braided wire 79A, one end of which is welded to the fixed terminal T1, is welded to the portion of the bimetal 45 that is fixed to the adjusting plate 72, and the other end of the braided wire 79A is connected to a first circuit board 73 described later. And the other end of the braided wire 79D, one end of which is welded to the movable contact 4A, is welded to a substantially central portion of the bimetal 45, and the fixed terminal T1, the braided wire 79A, the conductive plate 71A, the bimetal 45, and the braided wire. 79D, the movable contact 4A is electrically connected. In addition, the other end of the braided wire 79B having one end welded to the selection terminal T2 is welded to a portion of the other bimetal 46 fixed to the adjustment plate 72 ′, and the current-carrying conductor 80 connected to the movable contact 4B ( The other end of the braided wire 79C whose one end is welded to the bimetal 46 is welded to a substantially central portion of the bimetal 46, which will be described later. The selection terminal T2, the braided wire 79B, the conductive plate 71B, the bimetal 46, the braided wire 79C, the energizing conductor 80, the movable The contact 4B is electrically connected. The adjustment screws 77 and 77 ′ are screwed to change the distance between the adjustment plates 72 and 72 ′ and the conductive plates 71A and 71B, thereby adjusting the lower end positions of the bimetals 45 and 46, that is, the sensitivity of the thermal release device. It is possible.
[0043]
Incidentally, the conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition wall member 31. The partition member 31 is made of a synthetic resin molded product having insulation properties, and a flat partition wall 31a that separates the two bimetals 45 and 46, and from the periphery of the partition wall 31a to both sides in the thickness direction (the width direction of the container 1). The conductive plate 71A and the bimetal 45 and the conductive plate 71B and the bimetal 46 are accommodated in the recesses 31c and 31c surrounded by the partition wall 31a and the peripheral wall 31b. A plurality of protrusions 31d are provided to project on the peripheral wall 31b above the recesses 31c, 31c, and the conductive plates 71A, 71B and the bimetal 45, are press-fitted between the protrusions 31d. 46 is held by the partition member 31 (see FIGS. 2 and 3). In addition, rectangular cutouts 31e and 31e are formed on the upper peripheral wall 31b of the recesses 31c and 31c in which the conductive plates 71A and 71B are accommodated so that the adjusting screws 77 and 77 ′ face the outside of the recesses 31c and 31c. It is. Further, a shaft 31f to be inserted into the shaft hole 42b of the second tripping plate 42 projects from the bottom of the recess 31c on the side where the conductive plate 71B and the bimetal 46 are accommodated.
[0044]
As shown in FIG. 5, the second electromagnetic release device 47A includes a fixed iron core 60 formed by bending a magnetic iron plate into a substantially U-shaped plan view having a pair of side pieces 60a and 60b having different lengths, and a rectangular flat plate. And a movable iron core 61 made of a magnetic iron plate. The fixed iron core 60 is placed on a step 31g formed in the peripheral wall 31b on the recess 31c side in which the conductive plate 71A is accommodated, and one (shorter) side piece 60a is inserted into the groove 31h provided in the partition wall 31a. Are accommodated in the recess 31c and are sandwiched between the bimetal 45 and the peripheral wall 31b (see FIG. 3). On the other hand, the movable iron core 61 is formed with a pair of through-holes 61a penetrating in the thickness direction, and a pair of protrusions provided on the surface opposite to the locking portion 41e at the upper end portion of the protruding portion 41b of the first tripping plate 41. A magnetic pole surface which is attached to the first tripping plate 41 by inserting and caulking the protrusion 41h through the through hole 61a, and is the tip of the other (longer) side piece 60b of the fixed iron core 60 as shown in FIG. Opposite.
[0045]
Thus, the magnetic pole surface of the side piece 60b of the fixed iron core 60 when an abnormal large current flows due to a ground fault or short circuit through the bimetal 45 of one pole including the main contact (the fixed contact 2A and the movable contact 3A). The movable iron core 61 is attracted and oscillated by the electromagnetic attraction force generated in the first, and the first tripping plate 41 to which the movable iron core 61 is attached is rotated counterclockwise in FIG. In addition, by attaching the movable iron core 61 to the first tripping plate 41 in this way, a member that transmits the movement of the movable iron core 61 to the first tripping plate 41 (for example, a second member in the first electromagnetic release device 47B). (Such as the tripping plate 42) is not necessary, and the number of parts can be reduced, and the distance between the movable iron core 61 and the first tripping plate 41 can be reduced.
[0046]
As shown in FIG. 6, the first electromagnetic release device 47B includes a fixed iron core 57 formed by bending a magnetic iron plate into a substantially U-shape in plan view, a movable iron core 58 formed of a rectangular flat magnetic iron plate, and a movable iron core. 58 is constituted by a leaf spring 59 which is an elastic member which is supported in a swingable manner on both end magnetic pole surfaces of the fixed iron core 57 and elastically urges the movable iron core 58 in a direction away from the fixed iron core 57. The conducting conductor 80 has an inner piece 80a in which one end of the braided wire 79C is welded to the front end portion, and an outer piece 80b that extends substantially L-shaped from the rear end of the inner piece 80a and faces the inner piece 80a substantially in parallel. The rear end of the movable contact 4B is connected to the front end of the outer piece 80b.
[0047]
The movable iron core 58 is fixed to the leaf spring 59 by inserting and fixing the projections 58a and 58a projected on the surface on the fixed iron core 57 side into holes 59b and 59b formed at one end of the central piece 59a of the leaf spring 59. It is swingably supported. On the other hand, the leaf spring 59 is arranged so that both side pieces 59c, 59c formed by bending on both sides of the central piece 59a are arranged along the outer surfaces of the both side pieces 57a, 57a of the fixed iron core 57, and are arranged at the ends of the both side pieces 59c, 59c. The engaging pieces 59d and 59d that protrude in the direction are engaged with recesses 57b and 57b formed at the outer corners of the fixed iron core 57, whereby the inner piece 80a of the conductive conductor 80 is fixed to the fixed iron core as shown in FIG. The movable iron core 58 is sandwiched between the inner piece 80a and the outer piece 80b so that the movable iron core 58 is sandwiched between the inner piece 80a and the outer piece 80b. At this time, the magnetic pole surface, which is the tip of both side pieces 57a, 57a of the fixed iron core 57, opposes the movable iron core 58 through the space between the center piece 59a of the leaf spring 59 and both side pieces 59c, 59c.
[0048]
Thus, both side pieces 57a of the fixed iron core 57 when an abnormal large current flows due to a ground fault or a short circuit through the conductive conductor 80 electrically connected to the movable contact 3B constituting the main contact of the other pole. , 57a, the movable iron core 58 is attracted and oscillated by the electromagnetic attractive force generated on the magnetic pole surface. In addition, since the fixed iron core 57 and the movable iron core 58 are connected to each other by the leaf spring 59 in this way, the first electromagnetic release device 47B can be easily assembled into the body 1 as will be described later. It is.
[0049]
Here, the direction of the electromagnetic attracting force generated on the magnetic pole surfaces of the both side pieces 57a, 57a of the fixed iron core 57 by the current flowing through the inner piece 80a of the current-carrying conductor 80, and the both side pieces 57a, The direction of the electromagnetic attractive force generated on the magnetic pole surface of 57a is made the same, and the electromagnetic attractive force for attracting the movable iron core 58 is strengthened so that the main contact is quickly opened.
[0050]
On the other hand, the third electromagnetic release device 48 is configured by winding an exciting coil 68 around the fixed iron core 57 of the first electromagnetic release device 47B. That is, as shown in FIG. 6, the coil bobbin 69 formed in a rectangular tube shape whose one side surface is opened by an insulating material such as a synthetic resin is protruded from the side pieces 57a and 57a of the fixed iron core 57 from both ends in the axial direction. As shown in FIG. 7, a coil 68 is wound between outer casings 69a and 69a provided at both ends of the coil bobbin 69 in the axial direction. In addition, in the vicinity of the opened side surfaces of the outer casings 69a and 69a of the coil bobbin 69, substantially cubic support portions 69b and 69b having insertion holes 69c are provided so as to protrude from one end of a substantially L-shaped terminal pin 69d. The end portions 68a of the coils 68 are respectively connected and electrically connected to one end portions of the terminal pins 69d protruding from the insertion holes 69c.
[0051]
Thus, when a leakage current flows due to a ground fault, the leakage protection circuit 51, which will be described later, energizes the coil 68 through the terminal pin 69d to excite the fixed core 57, and both side pieces 57a, 57a of the fixed core 57 are excited. An electromagnetic attractive force is generated on the magnetic pole surface of the magnetic core surface so that the movable iron core 58 is attracted and swung. In other words, the fixed iron core 57, the movable iron core 58, and the leaf spring 59 constituting the first electromagnetic release device 47B by winding the coil 68 around the fixed iron core 57 are also used as the third electromagnetic release device 48 for protection against leakage. Therefore, the number of parts can be reduced compared to the conventional case where the electromagnetic release device for high current protection and the electromagnetic release device for earth leakage protection for each pole are composed of independent parts. Space saving and downsizing can be achieved.
[0052]
Further, since the energizing directions of the coil 68 and the energizing conductor 80 (inner piece 80a) between the fixed iron core 57 and the movable iron core 58 coincide with each other, when the third electromagnetic release device 48 is operated by energizing the coil 68. The electromagnetic attractive force generated on the magnetic pole surfaces of the both side pieces 57a and 57a of the fixed iron core 57 can be increased, and the main contact can be opened quickly. Further, since the coil 68 is wound around the fixed iron core 57, the coil 68 does not move, so that the coil 68 can be prevented from being disconnected. However, the coil 68 may be wound around the movable iron core 58.
[0053]
The leakage protection circuit 51 has the circuit configuration shown in FIG. 8, and the voltage circuit (braided wire 79A) of the main circuit and the circuit of the neutral electrode or the other voltage electrode (braided wire 79B) are inserted. If the current flowing through each pole of the main circuit is unbalanced due to a leakage current such as a ground fault current, a current corresponding to the degree of unbalance between the output terminals of the zero-phase current transformer ZCT ( Detection current) flows. This detection current is an alternating current and is clamped by a clamp circuit composed of diodes D1 and D2 connected in antiparallel, and the detection current is converted into a voltage by charging the smoothing capacitor C1 through the resistor R1. The voltage across the smoothing capacitor C1, that is, the detected voltage converted from the detected current is input to the leakage current determination circuit 51a.
[0054]
The power source of the leakage current determination circuit 51a is connected to the series circuit of the diode D3, resistors R2 to R5, and the smoothing capacitor C2 between the two poles of the main circuit through the coil 68 of the third electromagnetic release device 48 from the terminal pin 69d. The voltage across the smoothing capacitor C2 is applied to the power supply terminal and the ground terminal of the leakage current determination circuit 51a. A series circuit of a coil 68, a thyristor SCR, and a diode D3 is connected between the two poles of the main circuit, and a control signal output from the output terminal of the leakage current determination circuit 51a is applied to the gate of the thyristor SCR. To turn on the thyristor SCR. A filter circuit including a capacitor C0 and a resistor R0 is connected between both ends of the thyristor SCR.
[0055]
The leakage current determination circuit 51a compares the detected voltage with a predetermined threshold, charges or discharges the capacitor C3 according to the comparison result, and outputs a control signal from the output terminal according to the voltage across the capacitor C3. Configured to delay results. Therefore, when a leakage current flows in the main circuit, the thyristor SCR is turned on by the control signal, and the coil 68 is energized to operate the third electromagnetic release device 48 and the movable iron core 58 is attracted to the fixed iron core 57. The leakage current determination circuit 51a is formed of an integrated circuit, and is externally connected with the capacitor C3 and a resistor R6 that determines a time constant for discharging the capacitor C3 after detecting leakage.
[0056]
Between the two poles of the main circuit, a test circuit 70 comprising a series circuit of a resistor RT, a normally open test switch SW, and a lead 70a inserted through the zero-phase current transformer ZCT is connected. That is, by turning on the test switch SW and passing a current through the lead 70a, an unbalanced current is caused to flow to the primary side of the zero-phase current transformer ZCT to create a pseudo-leakage state, and the leakage protection circuit 51 operates normally. You can test whether or not you want to. A surge absorbing element SA is connected in parallel to the resistor RT and the test switch SW.
[0057]
By the way, the plurality of types of circuit components constituting the leakage protection circuit 51 and the test circuit 70 are mounted on the first and second circuit boards 73 and 74 formed of a printed wiring board as shown in FIG. The first circuit board 73 includes high-power circuit components (resistors R2 and R3, a diode D3, a test circuit 70, a high-power circuit constituting the left-hand high-power circuit from the boundary line W indicated by a dotted line in the circuit diagram of FIG. A low-power circuit component (leakage current determination circuit 51a, clamp circuit, smoothing capacitor C1, zero-phase) constituting the low-power circuit on the right side from the boundary line W is mounted on the second circuit board 74. Current transformer ZCT, etc.) and a thyristor SCR are mounted. The test switch SW includes a movable contact plate 76a having one end bonded to the first circuit board 73 and supported to be swingable, and a pin mounted on the first circuit board 73 so as to face the movable contact plate 76a. When the test button 78 that is movably disposed on the free end side of the movable contact plate 76a is being pushed, the movable contact that is pushed and driven by the test button 78. The plate 76a contacts the fixed contact 76b and is turned on.
[0058]
The zero-phase current transformer ZCT has a ring-shaped core (not shown) around which a winding (not shown) is wound as shown in FIG. The pair of output terminals 75a projecting from the end portions of the housing 75 facing the axial direction of the core are inserted into the notches 74a and 74a provided on the upper portion of the second circuit board 74, and the housing 75 is connected to the second circuit. The output terminal 75a is mounted by soldering it to a wiring pattern (not shown) on the back surface in a state of being in close contact with the surface of the substrate 74.
[0059]
Further, as shown in FIG. 9, a contact pin 67 as a plurality of attachment portions for attaching the first and second circuit boards 73 and 74 to the housing 75 of the zero-phase current transformer ZCT.₁~ 67_FiveProjecting from both side surfaces in the axial direction. These contact pins 67₁~ 67_FiveIs made of metal, has its axial direction coincided with the axial direction of the zero-phase current transformer ZCT, and both ends protrude from the side surfaces of the housing 75 and are insert-molded into the housing 75 so as to face the first circuit board 73. Contact pin 67 on the side₁~ 67_FiveA boss 75 c that covers the surface of the housing 75 is formed integrally with the housing 75.
[0060]
On the other hand, each of the first and second circuit boards 73 and 74 has contact pins 67.₁~ 67_FiveThrough-holes 73a and 74b are respectively drilled, and contact pins 67 are inserted through the through-holes 73a and 74b.₁~ 67_FiveThe first and second circuit boards 73 and 74 are distributed and attached to both side surfaces in the thickness direction (axial direction) of the zero-phase current transformer ZCT. At this time, the contact pin 67₁~ 67_FourServes as a current path between the two circuit boards 73 and 74, and the contact pin 67₁~ 67_FiveThe circuit components mounted on the first and second circuit boards 73 and 74 are electrically connected via the. In addition, through holes 73b through which terminal pins 69d constituting the third electromagnetic release device 48 are respectively inserted are formed in the lower part of the first circuit board 73, and terminal pins 69d inserted into the respective through holes 73b are formed. The coil 68 is electrically connected to the leakage protection circuit 51 by joining the end portion to the wiring pattern. Further, a contact pin 67 is provided in the vicinity of the through hole 75b opened in the center of the housing 75._FiveThis contact pin 67 is provided._FiveBecomes the lead 70a of the test circuit 70 which penetrates the core of the zero-phase current transformer ZCT. The first and second circuit boards 73 and 74 are provided with circular insertion holes 73c and 74c that communicate with the through holes 75b of the housing 75 and through which the braided wires 79A and 79B are inserted. The first circuit board 73 has one end of a lead wire 82A connected to one pole of the main circuit (the pole having the main contact of the fixed contact 2A and the movable contact 3A) via the conductive plate 71A, and the main circuit. The other end of the lead wire 82B having one end welded to the connecting member 99 for connecting to the other pole (the pole having the main contact of the fixed contact 2B and the movable contact 3B) is connected.
[0061]
Thus, a plurality of types of circuit components constituting the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and second circuits are disposed on both sides in the thickness direction of the zero-phase current transformer ZCT. Since the boards 73 and 74 are arranged and accommodated in the container 1, each circuit board 73, 74 is compared with the case where the leakage protection circuit 51 and the zero-phase current transformer ZCT are mounted on one circuit board as in the prior art. The size of 74 in the longitudinal direction can be reduced, and the body 1 can be miniaturized. Further, a contact pin 67 as a mounting portion on the housing 75 of the zero-phase current transformer ZCT.₁~ 67_FiveBy providing this, the zero-phase current transformer ZCT can be easily attached to the first and second circuit boards 73 and 74. Further, the mounting portion is made of a metal contact pin 67.₁~ 67_FourSince the first and second circuit boards 73 and 74 are electrically connected to each other, the current path between the circuit boards 73 and 74 is different from that in the case where wiring is separately performed using a lead wire or the like. There is an advantage that it can be formed easily, and the contact pin 67₁~ 67_FiveCan be insulated from the winding of the zero-phase current transformer ZCT by insert molding in the housing 75.
[0062]
Contact pin 67_FiveSince the first and second circuit boards 73 and 74 are attached to the zero-phase current transformer ZCT, the lead 70a of the test circuit 70 can be easily used as the core of the zero-phase current transformer ZCT. Can be inserted. Further, a high-power circuit component constituting a high-power circuit is mounted on the first circuit board 73, and a weak-power circuit component mainly constituting a low-power circuit is mounted on the second circuit board 74. Therefore, it is possible to mount more circuit components on the second circuit board 74 on which light-electric circuit components that can shorten the insulation distance compared to the high-electric system are mainly mounted. Here, the lead wire 82A for connecting to one pole of the main circuit and the lead wire 82B for connecting to the other pole are connected to the first circuit board 73 on which a high-voltage circuit component is mounted. In the second circuit board 74, there is an advantage that the circuit components can be arranged without considering the insulation distance from the connection position of the lead wires 82A and 82B.
[0063]
Thus, when assembling the earth leakage breaker of this embodiment, first, the terminal block 10A is housed in the recess 8 of the first side case 1A, and the release handle 17 is assembled together with the return spring 21 at a fixed position. Further, the handle 6 is assembled together with a torsion spring 36 at a predetermined position. Then, the cross bar 40 is fitted with the movable contact 4A in the cut groove 54, and the coil spring 53 is housed in the recess, and is rotatably arranged with the coil spring 62 at a predetermined position of the first side case 1A. Further, the operation plate 43 is connected to the handle 6 by a link 44.
[0064]
In addition, the fixed terminal T1 is accommodated in the accommodating portion 90 provided at the bottom of the other end of the container 1, and the inner side is configured when the selection terminal T2 is abutted with the second side case 1B together with the slide member 83. It is stored in the inner compartment of the first side case 1 A corresponding to the storage unit 200. Further, the leg piece 83a of the slide member 83 is inserted into a slide groove formed on the outer side surface of the side wall of the first side case 1A through the insertion hole to expose the protruding portion 206 to the outside.
[0065]
Furthermore, the separation wall 91 formed in the height direction of the first side case 1A along the inner storage portion 200, and in the height direction facing the separation wall 91 at a substantially longitudinal center of the first side case 1A. First and second circuit boards 73 attached to the zero-phase current transformer ZCT with the second circuit board 74 having a long longitudinal dimension as the partition wall 91 side, in the upper part of the space between the formed separation wall 65, 74 is accommodated, and the first and third electromagnetic release devices 47B and 48 are accommodated in the lower portion of the space. Here, two ribs 92 are provided along the width direction of the container body 1 in the vicinity of the partition wall 91 at the bottom of the first side case 1A, and a fitting groove formed between the two ribs 92. By fitting the lower end portion of the second circuit board 74 to 92a, the longitudinal direction thereof substantially coincides with the height direction of the first side case 1A, and the axial direction of the zero-phase current transformer ZCT is the first side case. The second circuit board 74 is positioned and fixed so as to substantially coincide with the longitudinal direction of 1A.
[0066]
In addition, rectangular window holes 98 are respectively opened on the side walls of the opposite cases 1A and 1B facing the zero-phase current transformer ZCT, and the portion with the largest width dimension of the housing 75 is inserted into the window hole 98 to escape the housing 75. It is said. That is, since the width dimension of the housing 75 of the zero-phase current transformer ZCT is slightly larger than the width dimension of the first and second circuit boards 73 and 74, the width dimension of the container body 1 is adjusted to the width dimension of the housing 75. Although a useless space is generated, by providing the window hole 98 and releasing the housing 75 as described above, it is possible to prevent the useless space from being generated and to reduce the width dimension of the body 1. However, the width dimensions of the housing 75 and the container body 1 are set so that the housing 75 inserted into the window hole 98 does not protrude from the outer side surfaces of the side walls 1A and 1B.
[0067]
On the other hand, the first and third electromagnetic release devices 47B and 48 are arranged at the bottom of the first side case 1A in the lower part of the space with the movable iron core 58 in the height direction of the body 1 as shown in FIG. A zero-phase current transformer ZCT is arranged above the fixed iron core 57 in the height direction of the vessel body 1. Thus, the fixed iron core 57 and the movable iron core 58 connected by the leaf spring 59 are arranged at the bottom of the vessel body 1 along the height direction of the vessel body 1, and the axial direction is set on the upper portions of the fixed iron core 57 and the movable iron core 58. If the zero-phase current transformer ZCT is arranged so as to be substantially coincident with the longitudinal direction of the container body 1, the extending direction of the conducting conductor 80 sandwiched between the fixed iron core 57 and the movable iron core 58 is made coincident with the longitudinal direction of the container body 1. Therefore, the size of the container body 1 in the height direction can be reduced. Further, by arranging the zero-phase current transformer ZCT at the upper part in the height direction of the fixed iron core 57 and the movable iron core 58, the size in the longitudinal direction of the body 1 can be reduced. Furthermore, since the axial direction of the zero-phase current transformer ZCT coincides with the longitudinal direction of the body 1, it is easy to penetrate the main circuit circuit (braided lines 79A and 79B) through the zero-phase current transformer ZCT. Yes. Alternatively, when the braided wires 79A and 79B are incorporated in the first-side case 1A in a state where the braided wires 79A and 79B are passed through the zero-phase current transformer ZCT in advance, the distance for drawing the braided wires 79A and 79B in the container 1 may be short. In addition, since the movable iron core 58 is disposed on the bottom side of the body 1, the suction operation of the movable iron core 58 is not affected by the zero-phase current transformer ZCT, and the opening characteristics of the main contact described later are stabilized. Can do.
[0068]
Here, the movable contact 4B, the rear end of which is connected to the front end of the outer piece 80b, has a separating wall 65 located at a slightly upwardly inclined portion at the center thereof slightly above the bottom of the first side case 1A. It is arranged between the partition wall 95 extended from the lower end of the first side case 1A toward the other end of the first side case 1A, and further inclined and extended upward from the parallel portion, and the bottom of the first side case 1A. The free end of the movable contact 4B is disposed in a space in which the fixed contact 12B is disposed through the notch 14a of the partition wall 14 (see FIG. 2). At this time, the plurality of ribs 96 projecting from the lower surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A are fixed with the rear end portion of the movable contact 4B interposed therebetween. At this time, the connection member 99 connected to the first circuit board 73 and the lead wire 82B is sandwiched and fixed between the bottom of the first side case 1A and the movable contact 4B, and the leakage protection circuit 51 and the test circuit 70 are fixed. Is connected to the electric circuit of one pole.
[0069]
Further, the partition member 31 holding the conductive plates 71A and 71B and the bimetals 45 and 46 is housed in the space between the separation wall 65 and the partition wall 95. At this time, the partition member 31 is positioned in the space of the body 1 by placing the inclined part inclined obliquely upward of the lower peripheral wall 31 b of the partition member 31 along the inclined part of the partition wall 95. Thus, since the first circuit board 73 is disposed on the side close to the bimetals 45 and 46 in the longitudinal direction of the container 1, the distance between the second circuit board 74 and the bimetals 45 and 46 is increased. Thus, it is possible to suppress the influence of heat generated by the bimetals 45 and 46 on weakly-electric circuit components that are weak against heat, such as an IC (leakage current determination circuit 51a) mounted on the second circuit board 74.
[0070]
Furthermore, after the fixed iron core 60 is disposed in the recess 31c, the first trip plate 41 is rotatably disposed at a fixed position together with the torsion spring 81, and the second trip plate 42 is rotatable at a fixed position. Deploy. At this time, the receiving portion 42 c of the second tripping plate 42 faces the distal end portion of the movable iron core 58.
[0071]
In this way, as shown in FIG. 11, the intermediate case 7 and the terminal block 10B housed in the recess 9 of the intermediate case 7, the release handle 17 ′ and its return spring 21 ′ are arranged on the first side case 1A side. After the assembly, the intermediate case 7 in which the terminal block 10B, the release handle 17 ′, and the return spring 21 ′ are assembled in the recess 9 is disposed so as to overlap the first case 1A side.
[0072]
Here, when the intermediate case 7 is disposed at a fixed position on the first side case 1A side, the free end side of the movable contact 4A is disposed in the recess through the opening of the vertical wall and is provided in the terminal block 10A. The distal end side portion of the fixed contact 12 A is placed on the step surface of the bottom wall and the shaft is fitted into the recess 37 of the release handle 17.
[0073]
On the other hand, the stationary contact 12B provided in the terminal block 10B is placed on the rib 26 on the bottom of the first side case 1A. Further, the lower surface of the downward stepped portion that can be formed at the end of the intermediate case 7 is placed on a flat surface formed on the end wall of the first side case 1A.
[0074]
In this state, the second side case 1B is overlapped and coupled to the first side case 1A side. At this time, the claw-like hooking locking portions 101 at the tips of the elastic locking pieces 100 at the upper and lower ends of the both ends integrally projecting from the first side case 1A to the second side case 1B correspond to the second side case 1B side. The first case 1 A and the second case 1 B are coupled and fixed by the protrusion-like hooked portion 102 provided as described above to constitute the container 1 (see FIG. 11 and the like). When the first side case 1A and the second side case 1B are uncoupled and fixed, a driver is inserted into the second side case 1B through the release holes 150 corresponding to the hooked portions 102. The second side case 1 B can be removed from the first side case 1 A by pressing the hook locking portion 101 of each elastic locking piece 100 upward to remove the hooked state with the hooked portion 102.
[0075]
By attaching the second side case 1B, the shaft 40a of the cross bar 40 and the shaft portion 41a of the first tripping plate 41 are rotatable in the shaft holes 52 and 56 provided on the inner surface of the second side case 1B. Inserted into.
[0076]
Further, the heads of the adjusting screws 77 and 77 ′ corresponding to the bimetals 45 and 46 face the opening 104 opened on the upper surface of the container body 1 through the notch 31 e of the partition wall member 31, and an operation test after assembly is performed. The operation adjusting screws 77 and 77 ′ are screwed through the opening 104 so that an optimum operating point is sometimes obtained, so that the tip of the bimetal 45, the leg 41 c of the cross bar 40, the tip of the bimetal 46, and the second The distance between the trip plate 42 and the drive piece 42d is adjusted, and after the adjustment, the lid 106 is fitted into the peripheral portion of the opening 104 of the container 1 by using its elasticity to cover the opening 104.
[0077]
Here, the bimetals 45 and 46 are juxtaposed with the width direction of the container body 1 as the width direction while being held by the partition wall member 31, so that the dimensions in the width direction of the container body 1 are reduced. Further, since the displacement direction is set in the direction away from the second circuit board 74 and the first and third electromagnetic release devices 47B and 48 along the longitudinal direction of the container 1, the bimetal 45 and 46 and the first metal And the space | interval with the 3rd electromagnetic release apparatuses 47B and 48 and zero phase current transformer ZCT (2nd circuit board 74) can be narrowed, and size reduction of the longitudinal direction of the body 1 can be achieved.
[0078]
In addition, since the bimetals 45 and 46 are separated from each other by the partition wall 31a of the partition wall member 31, it is possible to achieve insulation between the bimetals 45 and 46 by the partition wall 31a and to narrow the interval. Further, by arranging the zero-phase current transformer ZCT across the partition wall 31a in the width direction of the body 1, the braided wires 79A and 79B connected to the bimetals 45 and 46 are passed through the zero-phase current transformer ZCT. It is easy. Furthermore, since the first and third electromagnetic release devices 47B and 48 including the fixed iron core 57 and the movable iron core 58 are also arranged so as to straddle the partition wall 31a in the width direction of the body 1, the fixed iron core 57 and the movable iron core 58 are also disposed. The width dimension of the main contact can be sufficiently increased, and the time required for opening the main contact can be shortened by increasing the electromagnetic attractive force.
[0079]
Further, in the present embodiment, the first electromagnetic release device 47B is placed on the fixed iron core 60 side of the second electromagnetic release device 47A in the container 1, and the operation direction (vertical direction in FIG. 1) of the movable iron core 58 is second. The electromagnetic release device 47A is housed so as to be substantially orthogonal to the moving direction of the movable iron core 61 (left and right direction in FIG. 3), and faces the fixed iron cores 57, 60 of the first and second electromagnetic release devices 47B, 47A. Since the circuit block of the leakage protection circuit 51 including the zero-phase current transformer ZCT is arranged at a position in the body 1, the movable iron cores 58 and 61 of the first and second electromagnetic release devices 47B and 47A and the tripping member There is an advantage that the operation space of the first tripping plate 41 and the second tripping plate 42 can be sufficiently secured, and the space in the vessel body 1 can be effectively used to further reduce the size.
[0080]
Thus, the selection terminal T2 and the fixed terminal T1 are respectively stored in the inner storage part 200 and the storage part 90 inside the other end of the container body 1, and one end of the container body 1 corresponds to these terminals T1 and T2. The insertion portions 209a to 209c that are open so as to extend over the end surface and both side surfaces of the container body 1 are formed in the portion. Further, a pair of wire insertion holes 16A and 16B opened obliquely upward are formed in parallel at one end of the vessel body 1.
[0081]
Therefore, the load side electric wires are inserted into the electric wire insertion holes 16A and 16B, respectively, and connected to the terminal blocks 10A and 10B, and the conductive bar of the voltage electrode is inserted into the fixed terminal T1 in the width direction via the insertion portion 209c. By connecting and connecting the conductive bar of the neutral electrode or the other voltage electrode to the selection terminal T2 in the width direction via the insertion portion 209a or 209b, the leakage breaker of this embodiment can be inserted into the electric circuit. It will be possible.
[0082]
By the way, as shown in FIG. 1, a projecting portion 105 through which an insertion hole 105a for inserting the test button 78 is provided is provided in the vicinity of the opening 104 of the second side case 1B, and the test button 78 is formed with a bifurcated tip. Is inserted into the insertion hole 105a from above and the locking step 78a is locked to the periphery of the insertion hole 105a in the container 1 so that the test button 78 is movable in the height direction of the container 1 and is prevented from coming off. It is attached to the projecting part 105. The tip of the test button 78 is opposed to the movable contact plate 76a of the test switch SW mounted on the second circuit board 74. By pressing the test button 78, the movable contact plate 76a is moved at the tip. The test switch SW can be turned on by being pushed and brought into contact with the fixed contact 76b. The lid 106 is provided with a semicircular cutout 106a through which the test button 78 is inserted in order to avoid interference with the test button 78.
[0083]
Here, since the window hole 98 in which the housing 75 of the zero-phase current transformer ZCT is partially exposed is opened on both sides of the container 1, foreign matter intrusion into the container 1 from the window hole 98 is prevented. At the same time, in order to improve appearance, an insulating sheet (not shown) formed of a sheet-like material having an insulating property in a rectangular tube shape is attached to the body 1 to cover the window hole 98. Yes.
[0084]
Next, the operation of the present embodiment will be described with reference to FIGS. 2 and 3 and FIGS. 12 and 13 show an open state. In this open state, the operating portion 6a of the handle 6 is in an inverted state exposed from the window hole 50, and the engagement between one end of the operating plate 43 and the first tripping plate 41 is shown. The combined state is out of state. The crossbar 40 is urged by the coil spring 62 so as to rotate clockwise in FIG. 12 (counterclockwise in FIG. 13), and the movable contact is inserted through the groove 54 of the crossbar 40. The child 4A is in a state where the free end is moved upward, and the movable contact 4B inserted through the kerf 55 is in a state where the free end is moved upward by its spring elastic force. The movable contacts 3A and 3B provided in the are separated from the corresponding fixed contacts 2A and 2B.
[0085]
In this state, when the operating portion 6a of the handle 6 is rotated clockwise in FIG. 12 (counterclockwise in FIG. 13), the upper shaft 44a of the link 44 is pushed downward, and the link 44 is moved to the lower shaft 44b. Thus, the operation plate 43 is pushed down. By pushing down the operating plate 43, one end (the right end in FIG. 12) of the operating plate 43 hits the locking portion 41e of the first tripping plate 41, and the operating plate 43 rotates counterclockwise in FIG. The other end of the operating plate 43 (the left end in FIG. 12) hits the protrusion 84 provided at the upper end of the cross bar 40, and the cross bar 40 is rotated counterclockwise in FIG. 13 (clockwise in FIG. 13) to rotate against the spring bias.
[0086]
By this rotation, the movable contact 4B inserted into the groove 55 of the cross bar 40 bends in the direction of moving the free end downward, and the free end movable contact 3B is brought into contact with the fixed contact 2B. Further, the movable contact 4A inserted through the kerf 54 rotates counterclockwise in FIG. 12 (clockwise in FIG. 13) to bring the movable contact 3A at the free end into contact with the fixed contact 2A. This contact is delayed from the time when the movable contact 3B contacts the fixed contact 2B.
[0087]
When the handle 6 is further rotated, the upper shaft 44a extends leftward (rightward in FIG. 3) from the line connecting the position of the lower shaft 44b of the link 44 and the center of rotation of the handle 6 as shown in FIG. In this state, the torsion spring 36 of the handle 6, the coil spring 62 that biases the cross bar 44, and the spring force of the movable contact 4 B are balanced so that one end of the operation plate 43 and the first trip plate 41 The latched state with the locking portion 41e is maintained, and the closing state of FIGS. 2 and 3 is maintained.
[0088]
Now, when the operating portion 6a of the handle 6 is turned counterclockwise in FIG. 2 (counterclockwise in FIG. 3) in the inserted state, the position of the upper shaft 44a of the link 44 is shifted from the rotation center of the handle 6 to the lower side. Since the line connecting the shafts 44b moves upward in the right direction (left direction in FIG. 3) in FIG. 2, the right end (left end in FIG. 3) of the operation plate 43 and the first trip plate 41 are locked. The crossbar 40 is rotated clockwise in FIG. 2 (counterclockwise in FIG. 3) by the biasing force of the coil spring 62, and the handle 6 is biased by the biasing force of the torsion spring 36. Quickly returns to the off side. As the crossbar 40 rotates clockwise in FIG. 2 (counterclockwise in FIG. 3), the movable contact 4A rotates clockwise in FIG. 2 (counterclockwise in FIG. 3) and the free end moves upward. The movable contact 3A is moved away from the fixed contact 2A. Further, the movable contact 4B is not pushed downward, and is returned to its original state by its spring force, so that the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is delayed from the time when the movable contact 3A is separated from the fixed contact 2A. This delay is the same during forced opening described later.
[0089]
Here, since the opening and closing of the main contacts of both poles is delayed as described above, the arc generated when the contacts are opened and closed is only the movable contact 4A on the rigid body side, and the arc of the movable contact 3B made of a spring material. It is possible to prevent exhaustion due to.
[0090]
Further, the stoppers 130 formed in both the cases 1A and 1B and the intermediate case 7 are inserted into the concave groove 131 formed in the width direction of the front end surface of the cross bar 40 that rotates when the main contact is opened, and the concave groove 131 is engaged. Because of the contact with the bottom of the container 1, there is no risk that an arc generated in one section will wrap around from the crossbar 40 side on the back side of the container 1 and enter the other section. Prevent short circuit.
[0091]
2 and 3, when an overcurrent flows through the load, the bimetals 45 and 46 generate heat due to the overcurrent and bend and displace. Here, the bimetals 45 and 46 hanging down from above are displaced so that the lower ends thereof move in the left direction in FIG. 2 (rightward in FIG. 3), and the lower ends of the bimetals 46 indicate the drive pieces 42d of the second tripping plate 42. 2, the lower end of the bimetal 45 pushes the receiving portion 41g at the tip of the leg portion 41c of the first tripping plate 41 in the right direction in FIG. Then, due to the displacement of the bimetal 46, the second trip plate 42 rotates counterclockwise in FIG. 2, and the opposing portion 42a of the second trip plate 42 pushes the receiving portion 41f of the first trip plate 41 leftward. . The first tripping plate 41 is rotated clockwise in FIG. 2 (counterclockwise in FIG. 3) by the receiving portion 41g being pushed by the bimetal 45 and the receiving portion 41f being pushed by the second tripping plate 42. To do.
[0092]
Now, when the first tripping plate 41 is rotated clockwise in FIG. 2 (counterclockwise in FIG. 3), the latched state between the locking portion 41e and one end of the operating plate 43 (right end in FIG. 2) is released, The actuating plate 43 pivots clockwise in FIG. 2 (counterclockwise in FIG. 3) about the lower shaft 44b of the link 44. Therefore, the restriction of the cross bar 40 by the other end of the operation plate 43 (the left end in FIG. 2) is eliminated, and the cross bar 40 is rotated clockwise in FIG. 2 (counterclockwise in FIG. 3) by the spring force of the coil spring 62. The movable contacts 4A and 4B are returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an overload current flows through the main circuit, the switching mechanism 5 is released by the thermal release device, and the main contact can be forcibly opened to protect the load.
[0093]
Thereafter, the bimetals 45 and 46 return to their original state due to the interruption of the electric circuit, and the first tripping plate 41 returns to its original position by the urging of the torsion spring 81, and at the same time, the opposing portion 42a of the second tripping plate 42. The receiving portion 41f pushes and moves the second tripping plate 42 back. Further, the handle 6 is rotated in the opening direction (counterclockwise in FIG. 2) by the bias of the torsion spring 36.
[0094]
Further, in the above-mentioned charged state, when an abnormal large current due to a ground fault or a short-circuit accident flows through the current-carrying conductor 80 of one pole, an electromagnetic attractive force is generated in the fixed iron core 57 to attract and swing the movable iron core 58. . Accordingly, as shown in FIG. 14, the tip of the movable iron core 58 pushes up the receiving portion 42 c of the second tripping plate 42 to rotate the second tripping plate 42 counterclockwise. When the second trip plate 42 rotates counterclockwise in the same manner as when an overload current flows, the opposing portion 42a of the second trip plate 42 moves the receiving portion 41f of the first trip plate 41 leftward. Push to turn clockwise. When the first tripping plate 41 rotates clockwise, the latched state between the locking portion 41e and one end (right end) of the operating plate 43 is released, and the operating plate 43 is centered on the lower shaft 44b of the link 44. Will rotate clockwise. Therefore, the crossbar 40 is not restricted by the other end (left end) of the operating plate 43, and the crossbar 40 is rotated clockwise (counterclockwise in FIG. 15) by the spring force of the coil spring 62, and the movable contact 4A. , 4B are returned to the open state, and the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B, respectively. That is, when an abnormal large current flows through one pole of the main circuit (the fixed contact 2B and the movable contact 3B), the opening / closing mechanism 5 is released by the first electromagnetic release device 47B to force the main contact. It can be opened.
[0095]
Thereafter, when the electromagnetic attraction force is no longer generated in the fixed iron core 57 due to the interruption of the electric circuit, the movable iron core 58 returns to the original state by the spring force of the leaf spring 59, and the first tripping plate 41 is restored to the original state by the bias of the torsion spring 81. At the same time, the receiving portion 41f of the second tripping plate 42 is pushed and moved to return the second tripping plate 42 to the original position. Further, the handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring 36.
[0096]
On the other hand, when an abnormal large current due to a ground fault or a short-circuit accident flows in the bimetal 45 of the other pole in the above-mentioned charged state, an electromagnetic attractive force is generated in the fixed iron core 60 to attract and swing the movable iron core 61. As a result, the first tripping plate 41 to which the movable iron core 61 is attached rotates counterclockwise in FIG. 15, and the latched state between the locking portion 41e and one end (left end) of the operating plate 43 is released. The actuating plate 43 rotates counterclockwise around the lower shaft 44b of the link 44. Therefore, the restriction of the cross bar 40 by the other end (right end) of the operating plate 43 is eliminated, and the cross bar 40 is rotated counterclockwise by the spring force of the coil spring 62 to return the movable contacts 4A and 4B to the open state. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an abnormally large current flows through the other pole (the fixed contact 2A and the movable contact 3A) of the main circuit, the opening / closing mechanism 5 is released by the second electromagnetic release device 47A to force the main contact. It can be opened.
[0097]
Thereafter, when the electromagnetic attraction force is no longer generated in the fixed iron core 60 due to the interruption of the electric circuit, the first tripping plate 41 is returned to the original position by the urging of the torsion spring 81. Further, the handle 6 is rotated in the opening direction (clockwise) by the bias of the torsion spring 36.
[0098]
Further, when a leakage current such as a ground fault current flows in the input state, the leakage protection circuit 51 energizes the coil 68 to generate an electromagnetic attracting force on the fixed core 57 to attract and swing the movable core 58. . As in this case, as shown in FIG. 14, the tip of the movable iron core 58 pushes the receiving portion 42c of the second tripping plate 42 to rotate the second tripping plate 42 counterclockwise, as in the case where a short-circuit current flows. At the same time, the first tripping plate 41 is rotated clockwise to return the movable contacts 4A and 4B to the open state, thereby separating the movable contacts 3A and 3B from the fixed contacts 2A and 2B, respectively. That is, when a leakage current flows in the main circuit, the third electromagnetic release device 48 releases the opening / closing mechanism 5 to forcibly open the main contact to protect the ground fault.
[0099]
【The invention's effect】
According to the first aspect of the present invention, there is provided a container housing a main circuit having a two-pole main contact, a handle that is at least partially exposed from the container so as to be rotatable, and at least the main circuit according to the operation of the handle. An opening / closing mechanism that opens and closes the main contact, and a first that forcibly opens the main contact by releasing the opening / closing mechanism when an abnormal large current flows to one main contact of the main circuit due to a ground fault or short circuit accident An electromagnetic release device, a second electromagnetic release device that releases the switching mechanism to forcibly open the main contact when the abnormal large current flows to the other main contact of the main circuit, and detects a leakage current And a third electromagnetic release device for releasing the opening / closing mechanism and forcibly opening the main contact when the leakage current is detected by the leakage current detection means. The electromagnetic release device of this type sandwiches the current-carrying conductors of each pole forming the main circuit between the fixed iron core Each of the movable iron cores is swingably connected to and separated from the fixed iron core. When the movable iron core is attracted to the fixed iron core, the opening / closing mechanism is released. The third electromagnetic release device is the first electromagnetic release device. The coil is wound around the fixed iron coreThe opening / closing mechanism restricts the movement of the latch member that latches the main contact to the closed state and the latch member that shifts the main contact to the open state, and the restriction is controlled by the first to third electromagnetic release devices. A leakage breaker comprising: a tripping member to be released; and a movable iron core provided in the second electromagnetic release device is attached to the tripping member, wherein the first electromagnetic release device is disposed in the body. The second electromagnetic release device is housed on the fixed iron core side so that the movement direction of the movable iron core is substantially orthogonal to the movement direction of the movable iron core in the second electromagnetic release device. Leakage current detection means was placed at a position in the container facing the fixed iron coreTherefore, by combining the fixed iron core and the movable iron core constituting the first electromagnetic release device with the third electromagnetic release device for leakage protection, the number of parts can be reduced as compared with the prior art, and each pole In addition, space saving and downsizing can be achieved while protecting from an abnormally large current due to a ground fault or short circuit accident.In addition, a member for transmitting the movement of the movable iron core to the tripping member becomes unnecessary, the number of parts can be further reduced, and the distance between the movable iron core and the tripping member can be further reduced, and further reduction in the size can be achieved. The operation space of the movable iron core and the tripping member of the electromagnetic release device 2 can be sufficiently secured, and the space in the body can be effectively used to further reduce the size.There is an effect.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment.
FIG. 2 is a side view showing the input state, with the second side case removed.
FIG. 3 is a side view showing the input state, with the first side case removed.
FIG. 4 is a rear sectional view of the above.
FIG. 5 is an exploded perspective view of the second electromagnetic release device and the thermal release device in the same as above.
FIG. 6 is an exploded perspective view of the first and third electromagnetic release devices in the same as above.
FIG. 7 is a perspective view of the first and third electromagnetic release devices in the same as above.
FIG. 8 is a circuit diagram of a leakage protection circuit and a test circuit in the same as above.
FIG. 9 is an exploded perspective view of the structural portion of the zero-phase current transformer and the first and second circuit boards in the same as above.
FIG. 10 is a perspective view of the structural portion of the zero-phase current transformer and the first and second circuit boards in the same as above.
FIG. 11 is a rear sectional view of the same.
FIG. 12 is a side view showing the opened state of the above, with the second side case removed.
FIG. 13 is a side view showing the opened state, with the first case removed.
FIG. 14 is a side view showing a state in which the first electromagnetic release device has been operated from the input state, with the second side case removed.
FIG. 15 is a side view showing a state in which the first electromagnetic release device has been operated from the input state, with the first case removed.
[Explanation of symbols]
1 body
2A, 2B fixed contact
3A, 3B movable contact
5 Opening and closing mechanism
6 Handle
47B First electromagnetic release device
47A Second electromagnetic release device
48 Third Electromagnetic Release Device
57 Fixed iron core
58 Movable iron core
60 Fixed iron core
61 Movable iron core
68 coils

Claims

An instrument housing a main circuit having a two-pole main contact, a handle that is at least partially exposed from the instrument, and an opening / closing mechanism that opens and closes the main contact of the main circuit according to the operation of the handle. And a first electromagnetic release device that releases the switching mechanism to forcibly open the main contact when an abnormal large current flows to one main contact of the main circuit due to a ground fault or a short circuit accident, A second electromagnetic release device that releases the switching mechanism to forcibly open the main contact when an abnormal large current flows to the other main contact of the main circuit; and a leakage current detection means that detects the leakage current; And a third electromagnetic release device that releases the switching mechanism and forcibly opens the main contact when the leakage current is detected by the leakage current detection means. The first and second electromagnetic release devices include: Oscillates to the fixed iron core by sandwiching the current-carrying conductors of each pole forming the circuit with the fixed iron core Each of which has a movable iron core that is in contact with and away from it, and when the movable iron core is attracted to the fixed iron core, the opening and closing mechanism is released. The third electromagnetic release device is a fixed iron core provided in the first electromagnetic release device. Ri Na by winding a coil, said opening and closing mechanism includes a latch member for latching the main contact in the closed state, the main contacts of the latch member to shift to the open state while restricting the movement first to third An earth leakage circuit breaker comprising: a tripping member whose restriction is released by an electromagnetic release device; and a movable iron core provided in the second electromagnetic release device is attached to the tripping member. The electromagnetic release device is accommodated on the fixed iron core side of the second electromagnetic release device in the body so that the operation direction of the movable iron core is substantially orthogonal to the operation direction of the movable iron core in the second electromagnetic release device, Opposing to the fixed iron core of the second electromagnetic release device Earth leakage breaker, characterized in that a leakage current detecting means at the position of the body.