JP3687543B2 - Earth leakage breaker with phase loss protection - Google Patents

Earth leakage breaker with phase loss protection Download PDF

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JP3687543B2
JP3687543B2 JP2001024702A JP2001024702A JP3687543B2 JP 3687543 B2 JP3687543 B2 JP 3687543B2 JP 2001024702 A JP2001024702 A JP 2001024702A JP 2001024702 A JP2001024702 A JP 2001024702A JP 3687543 B2 JP3687543 B2 JP 3687543B2
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plunger
release device
main contact
electromagnetic release
leakage
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JP2001024702A
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JP2002231118A (en
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満 富田
孝 北村
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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【０００１】
【発明の属する技術分野】
本発明は、欠相保護付漏電遮断器に関するものである。
【０００２】
【従来の技術】
従来の欠相保護付漏電遮断器にあっては、例えば特開平５−２９０６８５号公報に記載されているように、漏電検出及び欠相検出の何れの場合も共通の電磁釈放装置により開閉機構を釈放して主接点を強制的に開極していた。また、主接点の強制開極時に共通の表示部材を用いて漏電あるいは欠相状態を表示していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来例では漏電及び欠相に対して同一の電磁釈放装置並びに同一の表示部材を用いているため、主接点が強制開極した場合に漏電が原因であるのか、欠相が原因であるのかが判別できない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、漏電検出による主接点の強制開極と欠相検出による主接点の強制開極とを容易に判別できる欠相保護付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、隔壁により区分けされた３つのスペースにそれぞれ主回路の各極を収納するケースと、少なくとも一部がケース前面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各極の主接点を開閉する開閉機構と、主回路に流れる漏電電流を検出する漏電検出手段と、漏電検出手段にて漏電電流が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第１の電磁釈放装置と、中性線の欠相を検出する欠相検出手段と、欠相検出手段にて欠相が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第２の電磁釈放装置と、第１の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する漏電表示部材と、第２の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する欠相表示部材とを備え、３つのスペースのうちで隣り合わない２つのスペースの一方に第１の電磁釈放装置並びに漏電表示部材を配設するとともに他方に第２の電磁釈放装置並びに欠相表示部材を配設し、これら２つのスペースに挟まれた残り１つのスペースにハンドルを配設し、開閉機構は、主接点の開閉と連動するラッチ部材と、主接点を閉極した状態でラッチ部材をラッチする引外し部材とを具備し、第２の電磁釈放装置は、欠相検出手段にて欠相が検出されたときに励磁される第２の電磁石と、励磁された第２の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第２のプランジャとを具備し、第２の電磁釈放装置により主接点が強制開極された状態において駆動された第２のプランジャの復帰を阻止する第２のストッパ部材を設け、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態では第２のプランジャにてラッチ部材をラッチしない位置に引外し部材を保持してなることを特徴とし、漏電検出による主接点の強制開極と欠相検出による主接点の強制開極とを容易に判別できる。しかも、隣り合わない２つのスペースの一方に第１の電磁釈放装置並びに漏電表示部材を配設するとともに他方に第２の電磁釈放装置並びに欠相表示部材を配設しているから、ケース内のスペースを有効に利用できるとともに、ハンドルを配設したスペースの両隣のスペースに漏電表示部材と欠相表示部材をそれぞれ配設している関係上、漏電表示と欠相表示が一目で判別できる。さらに、隣り合わない２つのスペースに第１及び第２の電磁釈放装置をそれぞれ配設しているから、主接点を開極する際に各極で発生するアークが隣り合う極に回り込み難くなって絶縁性が向上する。ここで、欠相が発生して負荷バランスが不平衡となっている場合にハンドルを操作して主接点を閉極すると、負荷に過電圧が印加されて負荷が故障する虞があるが、本発明においては、第２のストッパ部材によって第２のプランジャの復帰が阻止されている状態では第２のプランジャにてラッチ部材をラッチしない位置に引外し部材を保持しているから、ハンドルを操作しても主接点が閉極することがなく、負荷に過電圧が印加されるのを防ぐことができる。
【０００６】
請求項２の発明は、請求項１の発明において、漏電表示部材並びに欠相表示部材をそれぞれ外部に露呈する２つの表示窓を、３つの極の並列方向と略直交する方向においてケース前面の略同一の位置に開口したことを特徴とし、ケース前面から見た見栄えが良くなる。
【０００８】
請求項３の発明は、請求項１又は２の発明において、ケース外から第２のストッパ部材を操作することにより第２のプランジャの復帰阻止を解除可能としたことを特徴とし、第２のストッパ部材を操作して第２のプランジャの復帰阻止を解除すればラッチ部材をラッチする位置に引外し部材を戻すことができるため、ハンドルの操作によって主接点を閉極させることができる。
【０００９】
請求項４の発明は、請求項１乃至３のいずれかの発明において、第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１のプランジャと係止離脱自在に係合し、第１のプランジャの復帰が第１のストッパ部材で阻止されている状態では第１のプランジャから離脱するような厚みを有する第１の係合部と、第２のプランジャと係止離脱自在に係合し、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態ではラッチ部材をラッチしない位置に引外し部材を保持するような厚みの第２の係合部とを引外し部材に設けたことを特徴とし、引外し部材に設ける第１及び第２の係合部の厚みを変えるだけで請求項１の発明と同様の作用を奏し得るから、第１及び第２の電磁釈放装置の構成を共通化することができる。
【００１０】
請求項５の発明は、請求項１乃至３のいずれかの発明において、第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１及び第２のプランジャとそれぞれ係止離脱自在に係合する第１及び第２の係合部を引外し部材に設けるとともに、主接点の閉極時における第１のプランジャと第１の係合部の間隔に対して主接点の閉極時における第２のプランジャと第２の係合部の間隔を狭くしたことを特徴とし、引外し部材に設ける第１及び第２の係合部を同一の構造とし得るから、第１及び第２の電磁釈放装置、並びに漏電表示部材と欠相表示部材を配設するスペースが制約されず、隣り合わない２つのスペースを自由に選択することができる。
【００１１】
【発明の実施の形態】
（実施形態１）
以下、図１〜図１５を参照して本発明の実施形態１を説明する。
【００１２】
本実施形態は住宅用分電盤の主幹開閉器に用いられるものであって、直方体状に形成された合成樹脂製のケース１を有する。ケース１の上端部には端子台３０が形成されており、端子台３０にはそれぞれ端子ねじ３２を有したねじ付き端子よりなる３つの入力端子３，３，３が左右方向に並設されており、中央の入力端子３に単相３線式の中性線が接続され、両側の入力端子３，３に電圧線が接続される。端子台３０には、隣り合う入力端子３，３間を絶縁する絶縁壁３５が形成されている。また、図２に示すようにケース１の上端部の右端部から上方へ端子取付部１０が連続一体に突出しており、端子取付部１０の右側面から３つの出力端子４，４，４が突出する形で配置されている。而して、入力端子３，３，３と出力端子４，４，４とは１対１で対応付けされており、入力端子３，３，３にはそれぞれ電圧線及び中性線の電線導体（図示せず）が接続され、出力端子４，４，４にはそれぞれ母線となる導電バー（図示せず）が端子ねじを用いて接続される。また、端子取付部１０の内部には後述する接続線７を収納する収納部１５が形成され、この収納部１５と端子台３０とが隔壁２７によって仕切られている。
【００１３】
図１に示すように、ケース１内には、ケース１の幅方向（図１における左右方向）に並設された３つの主接点２６，２６，２６と、開閉機構部５と、主接点２６，２６，２６が介挿された電路（主回路）に流れる漏洩電流や地絡電流等の漏電電流を検出する零相変流器ＣＴと、漏電電流が流れたときに主接点２６，２６，２６を強制的に開極させるように開閉機構部５を作動させる第１の電磁釈放装置９Ａと、零相変流器ＣＴの検出出力に応じて第１の電磁釈放装置９Ａの動作制御を行う漏電保護回路５０と、中性線の欠相が発生したときに主接点２６，２６，２６を強制的に開極させるように開閉機構部５を作動させる第２の電磁釈放装置９Ｂと、中性線の欠相を検出して第２の電磁釈放装置９Ｂの動作制御を行う欠相保護回路５１と、上記電路に短絡電流や過負荷電流のような異常電流が流れたときに主接点２６，２６，２６を強制的に開極させるように開閉機構部５を作動させる引外し装置６，６とが収納されており、３極の主接点２６，２６，２６をケース１の前面に露設した単一のハンドル２によって開閉操作可能としてある。
【００１４】
ここで、ケース１は前面が開口するボディ１ａと、ボディ１ａの前面側に覆着されるカバー１ｂとから構成されている。ボディ１ａには内部空間を各極毎に区分けする隔壁２８が形成され、カバー１ｂにも同様に隔壁（図示せず）が形成されており、ボディ１ａとカバー１ｂを結合してケース１を組み立てれば、ボディ１ａ側の隔壁２８とカバー１ｂ側の隔壁が突き合わされて、主接点２６を含む３つの電路を絶縁し且つ収納する３つのスペースが形成される。
【００１５】
主接点２６は、入力端子３，３，３の端子板３１，３１，３１の下端縁から延設されたＬ字状の接点保持片３３，３３，３３の先端部に固着された固定接点２１，２１，２１と、導電性金属により短冊状に形成された可動接触子２５，２５，２５の長手方向の一端部に固着され固定接点２１，２１，２１に接離する可動接点２２，２２，２２とで構成される。ここで、電圧線に接続される両側の入力端子３，３に対応する可動接触子２５，２５は編組線よりなる接続線７ａ，７ａにより各々引外し装置６，６に接続され、さらに引外し装置６，６が被覆電線からなる接続線７ｂ，７ｂを介して上記各入力端子３，３に対応する出力端子４，４に接続される。また、中性線に接続される中央の入力端子３に対応する可動接触子２５は接続線７ｂを介して上記入力端子３に対応する出力端子４に接続される。また、これらの接続線７ｂ，７ｂ，７ｂはケース１の下部に収納された零相変流器ＣＴのトロイダルコアの貫通孔に挿通されるとともにケース１内部の下面および右側面に沿ってケース１内に形成されたＬ字状の収納部１５内で引き回してある。
【００１６】
ケース１前面（カバー１ｂ前面）の中央位置、すなわちケース１内に形成された３つのスペースのうちの中央のスペースに対向する位置には矩形状に開口するハンドル挿通孔２９が形成される。また、ケース１内部のハンドル挿通孔２９の近傍には、ハンドル２を軸支するハンドル軸８の両端部を受ける軸受け孔１２ｅを備えたフレーム１２が設けられる。フレーム１２は金属板で形成され、図３に示すように略同形状の一対の側片１２ａ，１２ａと、両側片１２ａ，１２ａを端縁で連結する連結片１２ｂと、各側片１２ａ、１２ａの下端縁より外側に突出する固定片１２ｃとを備える。固定片１２ｃにはねじ孔１２ｄが形成されており、ボディ１ａ底面より突設された取付台（図示せず）にねじ止めして固定される。ハンドル２は合成樹脂の成型品からなり、ハンドル挿通孔２９を通してケース１の前面に突出する操作部２ａを有し、操作部２ａの背面にはハンドル軸８を受ける軸受け部２ｃが設けられるとともに、軸受け部２ｃの下方に突出するリンク軸受け部２ｂが設けられる。なお、操作部２ａとリンク支持部２ｂとは一直線上にはなく略く字形になるように互いの突出方向が設定されている。而して、軸受け部２ｃに挿通したハンドル軸８の両端部をフレーム１２の両側片１２ａ，１２ａに設けた軸受け孔１２ｅ，１２ｅに挿通することにより、ハンドル２がフレーム１２に回動自在に取り付けられる。すなわち、ハンドル２は操作部２ａがハンドル挿通孔２９の開口面と略面一になる位置（図６参照）と、操作部２ａがハンドル挿通孔２９から突出する位置（図７参照）との間でハンドル軸８を支点として回動し起伏自在になっている。ここで、ハンドル２の軸受け部２ｃの外周に鋏形ばねよりなるハンドル復帰ばね１６が装着されており、ハンドル復帰ばね１６の一端に設けた係止片１６ａがフレーム１２の一方の側片１２ａに形成された引掛溝１２ｊに引掛係止されており、このハンドル復帰ばね１６のばね力によって操作部２ａがケース１前面から起立する向きにハンドル２が付勢されている。
【００１７】
開閉機構部５はハンドルリンク１１、ラッチ板１３、可動枠１７を備える。ハンドルリンク１１は、図３に示すように略短冊形の一対の脚片１１ｃ，１１ｃと、脚片１１ｃ，１１ｃの下端部に橋架された円筒形の駆動軸１１ｂとを有し、脚片１１ｃ，１１ｃを連結する連結片１１ｄと、ハンドル２のリンク軸受け部２ｂの軸孔に挿通したリンク軸３６の両端部が挿通されるリンク軸受け孔１１ａ，１１ａが各脚片１１ｃ，１１ｃの上端部に形成されている。リンク軸受け孔１１ａ，１１ａから各脚片１１ｃ，１１ｃの外側へ突出するリンク軸３６の両端部が、フレーム１２の両側片１２ａ，１２ａに形成されている下方に凸となる弧状に湾曲したガイド溝１２ｆ，１２ｆに挿入係止されており、このガイド溝１２ｆ，１２ｆによってハンドルリンク１１の移動範囲が規制される。
【００１８】
ラッチ板１３は略く字形に形成されたラッチ片１３ａと、ラッチ片１３ａの上端部両側より同一方向へ突設された一対の腕片１３ｂ，１３ｂとを有する。腕片１３ｂ，１３ｂの先端部には略半円形の軸受け溝１３ｃ，１３ｃが形成されており、フレーム１２の両側片１２ａの対向する面に突設された軸突起１２ｇ，１２ｇを各軸受け溝１３ｃ，１３ｃで支承することにより、ラッチ板１３がフレーム１２に回動自在に取り付けられる。なお、ハンドルリンク１１の駆動軸１１ｂがラッチ板１３並びに可動枠１７の中央前端部に当接させてある（図６参照）。
【００１９】
また、図４に示すように可動枠１７は絶縁性を有する合成樹脂成型品からなり、３つの可動接触子２５，２５，２５がそれぞれ挿通係止される係止溝１７ａが並設され、ケース１の隔壁２７並びに隔壁２７と対向する内壁面に前後方向（図１における紙面に垂直な方向）に沿って形成された溝部１４に両端部が係止されてケース１の前後方向（図６における上下方向）に移動自在にケース１内に収納される。一方、可動接触子２５，２５，２５は、可動接点２２と反対側の端部がボディ１ａ内底面より突設された係止片１８に係止されるとともに、可動枠１７の係止溝１７ａに係止される部位と係止片１８に係止される端部との間の部位がコイルばね１９によってケース１の前方に付勢されている。このコイルばね１９は、一端側がボディ１ａ内底面の溝部１４と係止片１８との間に突設されている突起２０に挿着され、他端側が可動接触子２５に当接している。
【００２０】
引外し部材６０は、図３及び図６に示すように３つの可動接触子２５，２５，２５を跨ぐようにケース１の左右幅方向に沿って配設される基片６０ａと、基片６０ａの長手方向略中央の端縁より下方に突設された略Ｌ字形の脚片６０ｂと、基片６０ａの長手方向両端部近傍より側方へ突設された略三角形状の駆動片６０ｃ，６０ｅと、各駆動片６０ｃ，６０ｅの先端部から基片６０ａの長手方向と略平行に突設された第１及び第２の係合部６０ｄ，６０ｆとが合成樹脂により一体に形成されている。また、脚片６０ｂの屈曲部位には回動軸３７を挿通する軸受け孔を具備した軸受け部６０ｇが形成されており、フレーム１２の両側片１２ａに形成された軸受け孔１２ｉ，１２ｉに軸受け部６０ｇの両端から突出する回動軸３７の端部をそれぞれ支承することにより、引外し板６０がフレーム１２に回動自在に取り付けられる。ここで、軸受け部６０ｇの外周には鋏形ばねよりなる引外し部材復帰ばね６１が装着されており、引外し部材復帰ばね６１の一端に設けた係止片６１ａがフレーム１２の一方の側片１２ａに引掛係止され、この引外し部材復帰ばね６１のばね力によって脚片６０ｂがラッチ板１３に近づく向き（図６における時計回り）に引外し部材６０が付勢されている。
【００２１】
而して、図７に示すように主接点２６が開極した状態（開放状態）から操作部２ａを伏せるようにハンドル２を回動させるとリンク軸受け部２ｂがラッチ板１３の方へ倒れるように回動し、これに伴ってハンドルリンク１１がリンク軸３６を支点として図７中時計回りに回動する。このハンドルリンク１１の回動に伴ってハンドルリンク１１の駆動軸１１ｂがラッチ板１３のラッチ片１３ａに摺接しながら可動接触子２５に近づく向き（図６における下方向）へ移動し、コイルばね１９のばね力に抗して可動枠１７を下方へ押駆動することによって可動接触子２５が下方へ移動する。そして、ハンドル軸８とハンドルリンク１１の駆動軸１１ｂとを結ぶ直線よりもリンク軸３６がラッチ板１３側（図６における右側）へ移動すると、ラッチ板１３の下端部が引外し部材６０の脚片６０ｂの先端に当接してラッチされるため、操作部２ａがハンドル挿通孔２９の開口面と略面一になる位置でハンドル２が保持される。このとき、ハンドルリンク１１の駆動軸１１ｂによって可動枠１７が下方へ押圧されるため、可動枠１７の係止溝１７ａに係止された３つの可動接触子２５，２５，２５も下方へ押駆動され、図６に示すように各可動接触子２５の先端部に固着されている可動接点２２が各々対向する固定接点２１に接触して主接点２６が閉極した状態（投入状態）となる。なお、上述の説明とは逆に図６に示す投入状態から操作部２ａを起立させる方向へハンドル２を回動すれば、ハンドルリンク１１の駆動軸１１ｂが前方へ移動し、コイルばね１９のばね力によって可動枠１７が上方へ移動するために可動接点２２が固定接点２１から離れて主接点２６が開極し、図７に示す開放状態となる。なお、図３に示すようにハンドル２の操作部２ａには一端側略中央より突出する突起２ｄが突設されており、主接点２６が開極した開放状態においてラッチ板１３のラッチ片１３ａ上端縁に突起２ｄが当接し（図７参照）、ラッチ板１３の回動が規制されている。
【００２２】
上述のように構成される開閉機構部５は、主接点２６の閉極状態において主回路に漏電電流が流れれば第１の電磁釈放装置９Ａの作動により、中性線に欠相が生じれば第２の電磁釈放装置９Ｂの作動により、短絡電流や過負荷電流などの異常電流が流れれば引外し装置６，６の作動により、引外し部材６０が駆動されてラッチ板１３のラッチ状態が解除されて主接点２６を強制的に開極させるように機能する。
【００２３】
第１の電磁釈放装置９Ａは、図４に示すように漏電保護回路５０の出力により通電されて励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ板１３のラッチ状態を解除するように引外し部材６０を駆動する第１のプランジャ９３Ａとを具備する。第１の電磁石は、漏電保護回路５０の出力により通電されて励磁されるコイル９０と、絶縁材料により両端部に開口を有する筒状に形成されて外側にコイル９０が巻装されるコイル枠９１と、磁性体により上方に開放する略コ字型に形成されたヨーク９２とで構成され、第１のプランジャ９３Ａがコイル枠９１内部に出没自在に挿入される。コイル枠９１は軸方向両端部に外鍔９１ａ，９１ｂを有する角筒状に形成され、一方の外鍔９１ｂの軸方向に直交する方向の両端部にはコイル９０の端末を接続するコイル端子９１ｃ，９１ｃが植設されており、これらの端子９１ｃ，９１ｃが漏電保護回路５０に接続される。漏電保護回路５０では、後述するように零相変流器ＣＴの２次巻線の出力が所定レベルを越えるとコイル９０に通電して励磁する。また、コイル枠９１の外鍔９１ｂの図４における右方には突部９５がコイル枠９１と一体に突設されている。この突部９５は、後述する第１のストッパ部材９４Ａが上下方向に移動自在に挿通されるストッパ部材挿通孔９５ａと、テストスイッチを構成する固定接点板９６を支持する支持台９５ｂとを有し、内部がコイル枠９１の内部空洞に連通し且つ端部が開口させてある。また、突部９５の支持台９５ｂには固定接点板９６が支持されるとともに、帯板状の導電部材を略へ字形に折曲してなる可動接点板９７の基端部９７ａが固定され、可動接点板９７の先端の接触部９７ｂと固定接点板９６とが接離自在に対向する。而して、固定接点板９６と可動接点板９７とでテストスイッチＳＷが構成されており、後述するようにテスト釦４２の押操作によって撓められた可動接点板９７の接触部９７ｂが固定接点板９６と接触導通してテストスイッチＳＷがオンすると試験回路５２が作動して零相変流器ＣＴに不平衡電流を流して擬似的に漏電状態を作り出すようになっている。
【００２４】
第１のストッパ部材９４Ａは合成樹脂により矩形平板状に形成され、図４に示すように中央に第１のプランジャ９３Ａが挿通する挿通窓９４ｃが開口する本体９４ａと、本体９４ａの一端側角部より下方に垂設されて先端部に係合突起９４ｄが突出した腕部９４ｂとを備える。また、本体９４ａの挿通窓９４ｃ前方の内周面からは図４における下方へ突出する取付突部９４ｅが形成されている。而して、コイルばねからなるストッパ部材復帰ばね９８の一端部に取付突部９４ｅを嵌合して取り付け、腕部９４ｂの側から突部９５のストッパ部材挿通孔９５ａに第１のストッパ部材９４Ａを挿入すれば、ストッパ部材挿通孔９５ａの内壁面に形成されている係止段部９５ｃにストッパ部材復帰ばね９８の他端部が係止し、ストッパ部材復帰ばね９８により反挿入方向へ付勢された状態で第１のストッパ部材９４Ａが突部９５に取り付けられる。
【００２５】
第１のプランジャ９３Ａは磁性を有する金属板を折曲することにより、図４に示すように下方に開放する断面形状略コ字形の主部９３ａと、主部９３ａの右側端面より外側へ略ハ字状に開く脚片９３ｂ，９３ｂとが一体に形成されている。ここで、片方の脚片９３ｂを略鈎形に折曲することでその下端に駆動片９３ｃが一体に形成されている。而して、コイルばねからなるプランジャ復帰ばね９９に内挿した主部９３ａの左端を、突部９５の開口から突部９５に取り付けられた第１のストッパ部材９４Ａの挿通窓９４ｃを通過してコイル枠９１の内部にまで挿入することにより、コイル枠９１の右端側の開口から突部９５の開口を通して第１のプランジャ９３Ａが出没自在となる。ここで、図１０に示すように突部９５の内部は開口側の大径部位とコイル枠９１側の小径部位とからなり、開口から大径部位内に挿入されたプランジャ復帰ばね９９が小径部位の開口周縁部と第１のプランジャ９３Ａの脚片９３ｂ，９３ｂとの間に圧縮状態で介装され、プランジャ復帰ばね９９によって第１のプランジャ９３Ａがコイル枠９１への反挿入方向へ付勢される。また、第１のストッパ部材９４Ａは、本体９４ａの挿通窓９４ｃ後方の周縁部９４ｆが第１のプランジャ９３Ａの主部９３ａの開放端縁に当接してストッパ部材挿通孔９５ａからの抜け止めが図られている。
【００２６】
ヨーク９２は、図４に示すように両側片９２ａ，９２ａがコイル９０の軸方向に沿って外鍔９１ａ，９１ａに当接するようにコイル枠９１の後方側に取着される。ここで、右端側の側片９２ａには第１のプランジャ９３Ａを逃がすための逃がし溝９２ｂが形成されており、この逃がし溝９２ｂを通してコイル枠９１の内部に第１のプランジャ９３Ａが挿入される。また、左端側の側片９２ａはコイル枠９１の上端側の開口を略半分程度被う寸法に形成されており、この開口を通して第１のプランジャ９３Ａの左端部とヨーク９２の左端側の側片９２ａとが対向させてある。
【００２７】
ところで、第１のプランジャ９３Ａの上端部には連結部１０１を介して漏電表示部材１００Ａが取り付けられる。漏電表示部材１００は、後述するように第１のプランジャ９３Ａに連動して漏電表示位置と非漏電表示位置の間をスライド移動するものであって、非磁性材料によって矩形板状に形成され、前面右側部分には漏電状態を表す文字（例えば、「漏電」の２文字）が印刷等の適宜の方法で表示されている。また、漏電表示部材１００の左側端縁の中央からは略Ｌ字形の連結部１０１が一体に形成されており、漏電表示部材１００と連結部１０１とで全体が略コ字形となっている。連結部１０１はコイル枠９１の内部に挿通可能な幅寸法であって、先端には第１のプランジャ９３Ａに固定される固定部１０２が一体に形成されている。この固定部１０２は連結部１０１よりも幅細であって先端部が二股に形成され、両端縁には係合爪１０２ａ，１０２ａが突設されている。一方、第１のプランジャ９３Ａの主部９３の左端縁からは固定部１０２を前後方向から狭持する３つの取付爪９３ｄ，９３ｄ，９３ｄが突設されるとともに、固定部１０２の係合爪１０２ａ，１０２ａを係合する係合溝９３ｅ，９３ｅが主部９３ａの上部に形成されている。
【００２８】
而して、図１０に示すように漏電表示部材１００がコイル枠９１の前方に位置する向きで、コイル枠９１の左端側の開口縁とヨーク９２の側片９２ａの先端縁との隙間から固定部１０２並びに連結部１０１をコイル枠９１の内部に挿入し、第１のプランジャ９３Ａの取付爪９３ｄ、９３ｄ、９３ｄに固定部１０２を狭持させ且つ係合爪１０２ａ，１０２ａを係合溝９３ｅ，９３ｅに係合することで固定部１０２が第１のプランジャ９３Ａに抜け止め状態で固定される。その結果、コイル枠９１の左端側の開口から突出した連結部１０１が外鍔９１ａを跨ぐようにコイル枠９１の前面側へ折り返され、漏電表示部材１００がコイル枠９１の前面と略平行に配置されることになる。但し、第１のプランジャ９３Ａがコイル枠９１の内部から抜け出る方向に移動すると、図１２に示すように連結部１０１がコイル枠９１の外鍔９１ａに当接して第１のプランジャ９３Ａの抜け止めが図られる。
【００２９】
なお、図４に示すように第２の電磁釈放装置９Ｂ並びに第２のストッパ部材９４Ｂは、それぞれ第１の電磁釈放装置９Ａ並びに第１のストッパ部材９４Ａと同一構成であるから同一の構成要素に同一の符号を付して説明を省略する。また、欠相表示部材１１０は漏電表示部材１００と同一構成を有し、後述するように第２のプランジャ９３Ｂに連動して欠相表示位置と非欠相表示位置の間をスライド移動するものであって、第２のプランジャ９３Ｂの左端部に連結部１１１を介して取り付けられる。欠相表示部材１１０は非磁性材料によって矩形板状に形成され、前面右側部分には欠相状態を表す文字（例えば、「欠相」の２文字）が印刷等の適宜の方法で表示されている。
【００３０】
一方、図４に示すように、可動枠１７には第１のストッパ部材９４Ａ並びに第２のストッパ部材９４Ｂの腕部９４ｂ、９４ｂがそれぞれ進退自在に挿入される凹溝１７ｂ，１７ｄが形成されるとともに、凹溝１７ｂ，１７ｄの前端部には各腕部９４ｂ，９４ｂ先端の係合突起９４ｄ，９４ｄが係合して抜け止めされる係合突部１７ｃ，１７ｅが形成されている。
【００３１】
上述のように構成される第１の電磁釈放装置９Ａと漏電表示部材１００、並びに第２の電磁釈放装置９Ｂと欠相表示部材１１０は、図１に示すようにケース１内に形成された３つのスペースのうちの隣り合わない両端のスペース（電圧線と接続する極が収納されるスペース）にそれぞれ配設される。このとき、図２に示すように漏電表示部材１００がケース１前面に形成された表示窓４０Ａに対向し、欠相表示部材１１０が同じくケース１前面に形成された表示窓４０Ｂに対向するとともに、テストスイッチＳＷを構成する可動接点板９７がケース１前面に押し込み自在に配設されたテスト釦４２と対向する。ここで、２つの表示窓４０Ａ，４０Ｂを、３つの極の並列方向（ケース１の幅方向）と略直交する方向（図２における上下方向）においてケース１前面の略同一の位置、すなわち、ケース１の下端から各表示窓４０Ａ，４０Ｂの下端縁までの距離が略等しい位置に開口してあるため、ケース１前面から見た見栄えが良くなるものである。
【００３２】
図５は第１の電磁釈放装置９Ａを駆動する漏電保護回路５０、第２の電磁釈放装置９Ｂを駆動する欠相保護回路５１、並びに漏電試験用の試験回路５２の回路図を示している。漏電保護回路５０では、零相変流器ＣＴの２次巻線の出力が電圧に変換されて漏電保護用ＩＣ５０ａの検出端子に入力され、漏電電流が流れることによって検出端子の入力電圧が所定レベルを越えると漏電保護用ＩＣ５０ａで漏電検出が行われて漏電検出信号が出力端子より出力され、この漏電検出信号でサイリスタＳＣＲ１をオンさせ、第１の電磁釈放装置９Ａのコイル９０に励磁電流を流して主接点２６を開極し、負荷保護を図るのである。また、試験回路５２は、電圧極に接続される２つの入力端子Ｔ１，Ｔ２間に常開のテストスイッチＳＷ、抵抗ＲＴ、零相変流器ＣＴのトロイダルコアの貫通孔に挿通するリード線Ｌｘの直列回路を接続してなり、テストスイッチＳＷがオンされたときにリード線Ｌｘに電流を流すことにより零相変流器ＣＴに不平衡電流を流して擬似的に漏電状態を作り出している。
【００３３】
一方、欠相保護回路５１では、入力端子Ｔ１，Ｔ２からの入力電圧がダイオードブリッジＤＢにより全波整流されて欠相保護用ＩＣ５１ａに入力され、また、中性線と接続する入力端子Ｔ３からの検出線Ｌｎが入力端子Ｔ１，Ｔ２間に接続された分圧抵抗Ｒ８，Ｒ９の分圧点に接続され、この分圧点がさらに抵抗Ｒ５，Ｒ６，Ｒ１２，Ｒ１３を通じて欠相保護用ＩＣ５１ａの検出端子に接続してある。検出端子の電圧は電源及び負荷が正常に接続されている場合には振幅の揃った脈流電圧が現れることになるが、中性線が断線して欠相が生じると、２つの電圧線の各相の負荷による分圧比によって交互に大小となる脈流電圧になり、この検出端子の電位が所定レベルを越えると欠相保護用ＩＣ５１ａで欠相検出が行われて欠相検出信号が出力端子より出力され、この欠相検出信号でサイリスタＳＣＲ２をオンさせ、第２の電磁釈放装置９Ｂのコイル９０に励磁電流を流して主接点２６を開極し、負荷保護を図るのである。なお、これら漏電保護回路５０、欠相保護回路５１並びに試験回路５２は、矩形平板状のプリント基板５３に漏電保護用ＩＣ５０ａや欠相保護用ＩＣ５１ａ等の回路部品を実装して構成され、図１並びに図６に示すようにケース１内部に収納される。
【００３４】
次に、上述のように構成される第１の電磁釈放装置９Ａの動作を説明する。まず、主回路に漏電電流が流れていない正常時においては、図９に示すように零相変流器ＣＴの２次側に不平衡電流が流れないために漏電保護回路５０がコイル９０に通電せず、よってコイル９０が励磁されないことからプランジャ復帰ばね９９のばね力によって第１のプランジャ９３Ａがコイル枠９１の内部から突出し、連結部１０１がコイル枠９１の外鍔９１ａに当接する位置で停止する。このとき、可動枠１７はハンドルリンク１１に押し下げられて図９中下方へ移動し主接点２６を閉極させている。また、第１のストッパ部材９４Ａは、腕部９４ｂの係合突起９４ｄが可動枠１７の係合突部１７ｃに係合しているために可動枠１７の移動に合わせて下方へ引っ張られている。なお、この状態（正常状態）では第１のプランジャ９３Ａの駆動片９３ｃは引外し部材６０の基片６０ａに設けられた凹溝６０ｈに挿通されて引外し部材６０と干渉しないようになっている。このとき、連結部１０１によって第１のプランジャ９３Ａに連結されている漏電表示部材１００は非漏電表示位置である移動範囲の一方の端位置（図９における右端の位置）にあり、ケース１の前面に設けられた表示窓４０Ａには漏電表示部材１００の前面左側部分、すなわち漏電状態を示す文字が記されていない部位が臨み、表示窓４０Ａを通して非漏電状態（正常状態）であることが表示される。
【００３５】
一方、地絡事故が発生して零相変流器ＣＴの２次側に不平衡電流が流れれば、上述したように漏電保護回路５０の出力によって第１の電磁釈放装置９Ａのコイル９０に通電される。通電によりコイル９０が励磁されると、コイル９０−第１のプランジャ９３Ａ−ヨーク９２を通る磁路の磁気抵抗を小さくするように第１のプランジャ９３Ａに対して吸引力が働き、プランジャ復帰ばね９９のばね力に抗して第１のプランジャ９３Ａがコイル枠９１の内部に引き込まれて図９における左方へ移動する。第１のプランジャ９３Ａが左方へ移動すると、第１のプランジャ９３Ａの駆動片９３ｃが引外し部材６０の第１の係合部６０ｄと係合して第１の係合部６０ｄが突設されている駆動片６０ｃに図９における左向きの力を作用させる。この左向きの力によって引外し部材６０が引き外し部材復帰ばね６１のばね力に抗して図９における反時計回りに回動し、引外し部材６０の脚片６０ｂとラッチ板１３の先端部とのラッチが解除される。すると、図８に示すようにラッチ板１３による支えがなくなったハンドルリンク１１がラッチ板１３に近づく向き（図８及び図９における右向き）に移動し、リンク軸３６がハンドル軸８とハンドルリンク１１の駆動軸１１ｂとを結ぶ直線よりも可動枠１７側（図８における左側）へ移動するから、ハンドル復帰ばね１６のばね力によってハンドル２が起立方向（図８における時計回り）に回動し、それに合わせてハンドルリンク１１の駆動軸１１ｂが図８における左方向へ移動する。このため、ハンドルリンク１１による可動枠１７への押圧力が作用しなくなって、コイルばね１９のばね力によって可動接触子２５並びに可動枠１７も図８における上方へ移動して主接点２６が強制的に開極（トリップ）される（図１０参照）。また、可動枠１７の上方への移動によって腕部９４ｂの係合突起９４ｄと可動枠１７の係合突部１７ｃとの係合が外れ、ストッパ部材復帰ばね９８のばね力によって第１のストッパ部材９４Ａが上方へ移動し、第１のストッパ部材９４Ａの本体９４ａの周縁部９４ｆが第１のプランジャ９３Ａの主部９３ａ下端側に形成されている凹溝状の係合部９３ｆと係合する。このとき、第１のプランジャ９３Ａの右方への移動に伴って漏電表示部材１００が漏電表示位置である移動範囲の他方の端位置（図１０における左端の位置）に移動し、ケース１前面の表示窓４０Ａに漏電表示部材１００の前面右側部分、すなわち漏電状態を示す文字が記されている部位が臨み、表示窓４０Ａを通して漏電状態であることが表示される。なお、表示窓４０Ａには漏電表示の文字を拡大するためのレンズ４１が嵌め込まれており、漏電表示の文字が見やすくなっている。
【００３６】
一方、主接点２６が開極すれば零相変流器ＣＴの２次側に不平衡電流が流れなくなり、漏電保護回路５０による通電が停止してコイル９０が励磁されなくなって第１のプランジャ９３Ａにも吸引力が働かず、プランジャ復帰ばね９９のばね力によって第１のプランジャ９３Ａが図１０における右方向へ移動しようとするが、上述のように第１のストッパ部材９４Ａの本体９４ａの周縁部９４ｆが第１のプランジャ９３Ａの主部９３ａ下端側に形成されている係合部９３ｆと係合するため、図１１に示すように第１のプランジャ９３Ａの移動が第１のストッパ部材９４Ａによって僅かの距離に規制され、漏電表示部材１００が漏電表示位置で静止する。ここで、上述のように主接点２６の開極により第１のプランジャ９３Ａが僅かに右方向へ移動すると、第１のプランジャ９３Ａの駆動片９３ｃによる左向きの力が引外し部材６０の駆動片６０ｃに作用しなくなるため、引外し部材復帰ばね６１のばね力により引外し部材６０が図１１における時計回りに回動して元の位置に復帰する。言い換えると、漏電検出による主接点２６の強制開極後に引外し部材６０が元の位置に復帰可能なように第１の係合部６０ｄの厚み（直径方向の寸法）ｔ１を設定しているのである。而して、上述したようにハンドル２を操作して主接点２６を閉極させるリセット動作を行えば、可動枠１７の下方への移動によって腕部９４ｂの係合突起９４ｄと可動枠１７の係合突部１７ｃとが係合し、ストッパ部材復帰ばね９８のばね力に抗して第１のストッパ部材９４Ａが下方へ移動して第１のストッパ部材９４Ａの本体９４ａの周縁部９４ｆと第１のプランジャ９３Ａの係合部９３ｆとの係合が外れ、プランジャ復帰ばね９９のばね力により第１のプランジャ９３Ａが右方へ移動して図６の投入状態に復帰する。
【００３７】
次に、第２の電磁釈放装置９Ｂの動作を説明する。まず、中性線の欠相が生じていない正常時においては、図１２に示すように欠相保護回路５１がコイル９０に通電せず、よってコイル９０が励磁されないことからプランジャ復帰ばね９９のばね力によって第２のプランジャ９３Ｂがコイル枠９１の内部から突出し、連結部１０１がコイル枠９１の外鍔９１ａに当接する位置で停止する。このとき、可動枠１７はハンドルリンク１１に押し下げられて図１２中下方へ移動し主接点２６を閉極させている。また、第２のストッパ部材９４Ｂは、腕部９４ｂの係合突起９４ｄが可動枠１７の係合突部１７ｅに係合しているために可動枠１７の移動に合わせて下方へ引っ張られている。なお、この状態（正常状態）では第１のプランジャ９３Ｂの駆動片９３ｃは引外し部材６０の基片６０ａに設けられた凹部６０ｉに挿通されて引外し部材６０と干渉しないようになっている。このとき、連結部１０１によって第２のプランジャ９３Ｂに連結されている欠相表示部材１１０は非欠相表示位置である移動範囲の一方の端位置（図１２における右端の位置）にあり、ケース１の前面に設けられた表示窓４０Ｂには欠相表示部材１１０の前面左側部分、すなわち欠相状態を示す文字が記されていない部位が臨み、表示窓４０Ｂを通して非欠相状態（正常状態）であることが表示される。
【００３８】
一方、中性線が欠相すれば、上述したように欠相保護回路５１の出力によって第２の電磁釈放装置９Ｂのコイル９０に通電される。通電によりコイル９０が励磁されると、コイル９０−第２のプランジャ９３Ｂ−ヨーク９２を通る磁路の磁気抵抗を小さくするように第２のプランジャ９３Ｂに対して吸引力が働き、プランジャ復帰ばね９９のばね力に抗して第２のプランジャ９３Ｂがコイル枠９１の内部に引き込まれて図１２における左方へ移動する。第２のプランジャ９３Ｂが左方へ移動すると、第２のプランジャ９３Ｂの駆動片９３ｃが引外し部材６０の第２の係合部６０ｆと係合して第２の係合部６０ｆが突設されている駆動片６０ｅに図１２における左向きの力を作用させる。この左向きの力によって引外し部材６０が引き外し部材復帰ばね６１のばね力に抗して図１２における反時計回りに回動し、引外し部材６０の脚片６０ｂとラッチ板１３の先端部とのラッチが解除される。すると、第１の電磁釈放装置９Ａの場合と同様に、ハンドルリンク１１による可動枠１７への押圧力が作用しなくなって、コイルばね１９のばね力によって可動接触子２５並びに可動枠１７も図１２における上方へ移動して主接点２６が強制的に開極（トリップ）される（図１３参照）。また、可動枠１７の上方への移動によって腕部９４ｂの係合突起９４ｄと可動枠１７の係合突部１７ｅとの係合が外れ、ストッパ部材復帰ばね９８のばね力によって第２のストッパ部材９４Ｂが上方へ移動し、第２のストッパ部材９４Ｂの本体９４ａの周縁部９４ｆが第２のプランジャ９３Ｂの主部９３ａ下端側に形成されている凹溝状の係合部９３ｆと係合する。このとき、第２のプランジャ９３Ｂの右方への移動に伴って欠相表示部材１１０が欠相表示位置である移動範囲の他方の端位置（図１３における左端の位置）に移動し、ケース１前面の表示窓４０Ｂに欠相表示部材１１０の前面右側部分、すなわち欠相状態を示す文字が記されている部位が臨み、表示窓４０Ｂを通して欠相状態であることが表示される。なお、表示窓４０Ｂにも欠相表示の文字を拡大するためのレンズ４１が嵌め込まれており、欠相表示の文字が見やすくなっている。
【００３９】
一方、主接点２６が開極すれば、欠相保護回路５１による通電が停止してコイル９０が励磁されなくなって第２のプランジャ９３Ｂにも吸引力が働かず、プランジャ復帰ばね９９のばね力によって第２のプランジャ９３Ｂが図１３における右方向へ移動しようとするが、第１の電磁釈放装置９Ａと同様に第２のストッパ部材９４Ｂの本体９４ａの周縁部９４ｆが第２のプランジャ９３Ｂの主部９３ａ下端側に形成されている係合部９３ｆと係合するため、図１４に示すように第２のプランジャ９３Ｂの移動が第２のストッパ部材９４Ｂによって僅かの距離に規制され、欠相表示部材１１０が欠相表示位置で静止する。ところが、上述のように主接点２６の開極により第２のプランジャ９３Ｂが僅かに右方向へ移動しても、第２のプランジャ９３Ｂの駆動片９３ｃによる左向きの力が引外し部材６０の駆動片６０ｅに作用したままであるため、引外し部材６０は元の位置に復帰することができない。言い換えると、欠相検出による主接点２６の強制開極後には引外し部材６０が元の位置に復帰不可能なように第２の係合部６０ｆの厚みｔ２を設定しているのである（ｔ１＜ｔ２）。而して、この場合にはハンドル２を操作しても腕部９４ｂの係合突起９４ｄと可動枠１７の係合突部１７ｅとが係合せず、欠相検出による主接点２６の強制開極をリセットすることはできない。すなわち、欠相が発生して負荷バランスが不平衡となっている場合にハンドル２を操作して主接点２６を閉極すると、負荷に過電圧が印加されて負荷が故障する虞があるが、本実施形態では第２のストッパ部材９４Ｂによって第２のプランジャ９３Ｂの復帰が阻止されている状態では第２のプランジャ９３Ｂにてラッチ部材１３をラッチしない位置に引外し部材６０を保持しているから、ハンドル２を操作しても主接点２６が閉極することがなく、負荷に過電圧が印加されるのを防ぐことができるのである。
【００４０】
一方、第２の電磁釈放装置９Ｂにより主接点２６が強制開極された場合のリセットは以下のようにして行う。すなわち、第２のストッパ部材９４Ｂと対向するケース１前面に貫設されているリセット孔４３から細い棒状の冶具を挿入し、この冶具の先端で第２のストッパ部材９４Ｂの本体９４ａ上部を押圧することにより、ストッパ部材復帰ばね９８のばね力に抗して第２のストッパ部材９４Ｂを図１４における下方へ移動させれば、第２のストッパ部材９４Ｂの本体９４ａの周縁部９４ｆと第２のプランジャ９３Ｂの係合部９３ｆとの係合が外れ、プランジャ復帰ばね９９のばね力により第２のプランジャ９３Ｂが右方へ移動し、第２の電磁釈放装置９Ｂが正常時の状態に復帰する。その結果、第２のプランジャ９３Ｂの駆動片９３ｃによる左向きの力が引外し部材６０の駆動片６０ｅに作用しなくなるため、引外し部材復帰ばね６１のばね力により引外し部材６０が図１４における時計回りに回動して図１５に示すように元の位置に復帰する。そして、この状態ではハンドル２を操作して主接点２６を閉極させるリセット動作を行えば、図１２に示す主接点２６の投入状態に復帰させることができる。
【００４１】
本実施形態は上述のように構成したものであり、ケース１内に設けた３つのスペースのうちで隣り合わない２つのスペースの一方に第１の電磁釈放装置９Ａ並びに漏電表示部材１００を配設するとともに他方に第２の電磁釈放装置９Ｂ並びに欠相表示部材１１０を配設し、これら２つのスペースに挟まれた中央のスペースにハンドル２を配設しているから、漏電検出による主接点２６の強制開極と欠相検出による主接点２６の強制開極とを容易に判別できる。しかも、隣り合わない２つのスペースの一方に第１の電磁釈放装置９Ａ並びに漏電表示部材１００を配設するとともに他方に第２の電磁釈放装置９Ｂ並びに欠相表示部材１１０を配設しているから、ケース１内のスペースを有効に利用できるとともに、ハンドル２を配設したスペースの両隣のスペースに漏電表示部材１００と欠相表示部材１１０をそれぞれ配設している関係上、漏電表示と欠相表示が一目で判別できるという利点がある。さらに、隣り合わない２つのスペースに第１及び第２の電磁釈放装置９Ａ，９Ｂをそれぞれ配設しているから、主接点２６を開極する際に各極で発生するアークが隣り合う極に回り込み難くなって絶縁性が向上するという利点もある。
【００４２】
（実施形態２）
実施形態１においては、欠相保護後のハンドル２の操作による誤ったリセットを防止するために欠相検出による主接点２６の強制開極後には引外し部材６０が元の位置に復帰不可能なように第２の係合部６０ｆの厚みｔ２を設定している。その結果、第１の電磁釈放装置９Ａと第２の電磁釈放装置９Ｂを同一構成のものとすることができ、部品の共通化によるコストダウンが図れるものである。これに対して本実施形態では、欠相保護後のハンドル２の操作による誤ったリセットを防止するために、引外し部材６０に設ける第１及び第２の係合部６０ｄ，６０ｆの厚みを同一とし、さらに主接点２６の閉極時における第１のプランジャ９３Ａと第１の係合部６０ｄの間隔に対して主接点２６の閉極時における第２のプランジャ９３Ｂと第２の係合部６０ｆの間隔を狭くしている（図１６及び図１９参照）。
【００４３】
而して、第１及び第２の係合部６０ｄ，６０ｆとそれぞれ係合する第１及び第２のプランジャ９３Ａ，９３Ｂの駆動片９３ｃ，９３ｃが脚片９３ｂ，９３ｂを略鈎形に折曲することで形成されるものであり、例えば脚片９３ｂ，９３ｂを折曲する角度を変えることによって、図１６に示すように第１のプランジャ９３Ａの主部９３ａと結合する脚片９３ｂの基端から駆動片９３ｃまでの距離Ｗ１に対して、図１９に示すように第２のプランジャ９３Ｂの主部９３ａと結合する脚片９３ｂの基端から駆動片９３ｃまでの距離Ｗ２を短く（Ｗ２＜Ｗ１）している。なお、他の構成については実施形態１と共通であるから共通する構成要素に同一の符号を付して説明を省略する。
【００４４】
すなわち、第１の電磁釈放装置９Ａについては実施形態１と同様に動作し、漏電検出による主接点２６の強制開極後には第１のプランジャ９３Ａの駆動片９３ｃによる図１７中左向きの力が引外し部材６０の駆動片６０ｃに作用しなくなるため、引外し部材復帰ばね６１のばね力により引外し部材６０が図１７における時計回りに回動して図１８に示すように元の位置に復帰する。
一方、第２の電磁釈放装置９Ｂについては、図２０に示すように欠相検出により主接点２６が強制開極すると欠相保護回路５１による通電が停止してコイル９０が励磁されなくなって第２のプランジャ９３Ｂにも吸引力が働かず、プランジャ復帰ばね９９のばね力によって第２のプランジャ９３Ｂが図２０における右方向へ移動しようとするが、実施形態１と同様に第２のストッパ部材９４Ｂの本体９４ａの周縁部９４ｆが第２のプランジャ９３Ｂの係合部９３ｆと係合するため、図２１に示すように第２のプランジャ９３Ｂの移動が第２のストッパ部材９４Ｂによって僅かの距離に規制される。そして、上述のように主接点２６の開極により第２のプランジャ９３Ｂが僅かに右方向へ移動しても、第２のプランジャ９３Ｂの駆動片９３ｃによる左向きの力が引外し部材６０の駆動片６０ｅに作用したままであるため、引外し部材６０は元の位置に復帰することができない。言い換えると、欠相検出による主接点２６の強制開極後には引外し部材６０が元の位置に復帰不可能なように第２のプランジャ９３Ｂの主部９３ａと結合する脚片９３ｂの基端から駆動片９３ｃまでの距離Ｗ２を設定しているのである。よって、この場合にはハンドル２を操作しても腕部９４ｂの係合突起９４ｄと可動枠１７の係合突部１７ｅとが係合せず、欠相検出による主接点２６の強制開極をリセットすることができないから、ハンドル２を操作しても主接点２６が閉極することがなく、負荷に過電圧が印加されるのを防ぐことができるのである。なお、本実施形態における第２の電磁釈放装置９Ｂのリセット手順は実施形態１と共通であるから説明は省略する。
【００４５】
而して、本実施形態では第１の電磁釈放装置９Ａと第２の電磁釈放装置９Ｂを同一構成とすることはできないが、引外し部材６０の駆動片６０ｃ，６０ｅに設ける第１及び第２の係合部６０ｄ，６０ｆの厚み寸法を同一とすることができるため、第１及び第２の電磁釈放装置９Ａ，９Ｂ、並びに漏電表示部材１００と欠相表示部材１１０を配設するスペースが制約されず、隣り合わない２つのスペースを自由に選択することができる。すなわち、実施形態１並びに本実施形態では、図１における中央のスペースに対して右側のスペースに第１の電磁釈放装置９Ａと漏電表示部材１００を配設し、中央のスペースに対して左側のスペースに第２の電磁釈放装置９Ｂと欠相表示部材１１０を配設しているが、これを逆にして左側のスペースに第１の電磁釈放装置９Ａと漏電表示部材１００を配設し、右側のスペースに第２の電磁釈放装置９Ｂと欠相表示部材１１０を配設しても全く同様に動作し得るのである。
【００４６】
【発明の効果】
請求項１の発明は、隔壁により区分けされた３つのスペースにそれぞれ主回路の各極を収納するケースと、少なくとも一部がケース前面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各極の主接点を開閉する開閉機構と、主回路に流れる漏電電流を検出する漏電検出手段と、漏電検出手段にて漏電電流が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第１の電磁釈放装置と、中性線の欠相を検出する欠相検出手段と、欠相検出手段にて欠相が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第２の電磁釈放装置と、第１の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する漏電表示部材と、第２の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する欠相表示部材とを備え、３つのスペースのうちで隣り合わない２つのスペースの一方に第１の電磁釈放装置並びに漏電表示部材を配設するとともに他方に第２の電磁釈放装置並びに欠相表示部材を配設し、これら２つのスペースに挟まれた残り１つのスペースにハンドルを配設し、開閉機構は、主接点の開閉と連動するラッチ部材と、主接点を閉極した状態でラッチ部材をラッチする引外し部材とを具備し、第２の電磁釈放装置は、欠相検出手段にて欠相が検出されたときに励磁される第２の電磁石と、励磁された第２の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第２のプランジャとを具備し、第２の電磁釈放装置により主接点が強制開極された状態において駆動された第２のプランジャの復帰を阻止する第２のストッパ部材を設け、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態では第２のプランジャにてラッチ部材をラッチしない位置に引外し部材を保持してなるので、漏電検出による主接点の強制開極と欠相検出による主接点の強制開極とを容易に判別でき、しかも、隣り合わない２つのスペースの一方に第１の電磁釈放装置並びに漏電表示部材を配設するとともに他方に第２の電磁釈放装置並びに欠相表示部材を配設しているから、ケース内のスペースを有効に利用できるとともに、ハンドルを配設したスペースの両隣のスペースに漏電表示部材と欠相表示部材をそれぞれ配設している関係上、漏電表示と欠相表示が一目で判別できるという効果がある。さらに、隣り合わない２つのスペースに第１及び第２の電磁釈放装置をそれぞれ配設しているから、主接点を開極する際に各極で発生するアークが隣り合う極に回り込み難くなって絶縁性が向上するという効果がある。ここで、欠相が発生して負荷バランスが不平衡となっている場合にハンドルを操作して主接点を閉極すると、負荷に過電圧が印加されて負荷が故障する虞があるが、本発明では、第２のストッパ部材によって第２のプランジャの復帰が阻止されている状態では第２のプランジャにてラッチ部材をラッチしない位置に引外し部材を保持しているから、ハンドルを操作しても主接点が閉極することがなく、負荷に過電圧が印加されるのを防ぐことができるという効果がある。
【００４７】
請求項２の発明は、請求項１の発明において、漏電表示部材並びに欠相表示部材をそれぞれ外部に露呈する２つの表示窓を、３つの極の並列方向と略直交する方向においてケース前面の略同一の位置に開口したので、ケース前面から見た見栄えが良くなるという効果がある。
【００４９】
請求項３の発明は、請求項１又は２の発明において、ケース外から第２のストッパ部材を操作することにより第２のプランジャの復帰阻止を解除可能としたので、第２のストッパ部材を操作して第２のプランジャの復帰阻止を解除すればラッチ部材をラッチする位置に引外し部材を戻すことができるため、ハンドルの操作によって主接点を閉極させることができるという効果がある。
【００５０】
請求項４の発明は、請求項１乃至３のいずれかの発明において、第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１のプランジャと係止離脱自在に係合し、第１のプランジャの復帰が第１のストッパ部材で阻止されている状態では第１のプランジャから離脱するような厚みを有する第１の係合部と、第２のプランジャと係止離脱自在に係合し、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態ではラッチ部材をラッチしない位置に引外し部材を保持するような厚みの第２の係合部とを引外し部材に設けたので、引外し部材に設ける第１及び第２の係合部の厚みを変えるだけで請求項１の発明と同様の効果を奏し得るから、第１及び第２の電磁釈放装置の構成を共通化することができ、部品の共通化によるコストダウンが図れるという効果がある。
【００５１】
請求項５の発明は、請求項１乃至３のいずれかの発明において、第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１及び第２のプランジャとそれぞれ係止離脱自在に係合する第１及び第２の係合部を引外し部材に設けるとともに、主接点の閉極時における第１のプランジャと第１の係合部の間隔に対して主接点の閉極時における第２のプランジャと第２の係合部の間隔を狭くしたので、引外し部材に設ける第１及び第２の係合部を同一の構造とし得るから、第１及び第２の電磁釈放装置、並びに漏電表示部材と欠相表示部材を配設するスペースが制約されず、隣り合わない２つのスペースを自由に選択することができるという効果がある。
【図面の簡単な説明】
【図１】実施形態１を示し、カバーを外した状態の正面図である。
【図２】同上の正面図である。
【図３】同上における開閉機構部の一部省略した分解斜視図である。
【図４】同上における第１及び第２の電磁釈放装置の分解斜視図である。
【図５】同上における漏電保護回路、欠相保護回路並びに試験回路の回路図である。
【図６】同上の閉極時の側面断面図である。
【図７】同上のハンドルによる開極時の側面断面図である。
【図８】同上の強制開極直前の側面断面図である。
【図９】同上の閉極時の側面断面図である。
【図１０】同上の漏電検出により強制開極した瞬間の側面断面図である。
【図１１】同上の漏電検出により強制開極した後の側面断面図である。
【図１２】同上の閉極時の側面断面図である。
【図１３】同上の欠相検出により強制開極した瞬間の側面断面図である。
【図１４】同上の欠相検出により強制開極した後の側面断面図である。
【図１５】同上の第２の電磁釈放装置をリセットしたときの側面断面図である。
【図１６】実施形態２の閉極時の側面断面図である。
【図１７】同上の漏電検出により強制開極した瞬間の側面断面図である。
【図１８】同上の漏電検出により強制開極した後の側面断面図である。
【図１９】同上の閉極時の側面断面図である。
【図２０】同上の欠相検出により強制開極した瞬間の側面断面図である。
【図２１】同上の欠相検出により強制開極した後の側面断面図である。
【符号の説明】
１ ケース
２ ハンドル
５ 開閉機構部
９Ａ 第１の電磁釈放装置
９Ｂ 第２の電磁釈放装置
２８ 隔壁
１００ 漏電表示部材
１１０ 欠相表示部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an earth leakage circuit breaker with phase loss protection.
[0002]
[Prior art]
In a conventional earth leakage circuit breaker with phase loss protection, for example, as disclosed in JP-A-5-290685, an open / close mechanism is provided by a common electromagnetic release device in both cases of earth leakage detection and phase failure detection. It was released and the main contacts were forcibly opened. Further, when the main contact is forcibly opened, a common display member is used to display a leakage or open phase state.
[0003]
[Problems to be solved by the invention]
However, in the above conventional example, the same electromagnetic release device and the same display member are used for the leakage and the phase loss, so that the leakage is caused when the main contact is forcibly opened or because of the phase loss. There was a problem that it was not possible to determine if there was.
[0004]
The present invention has been made in view of the above problems, and the object of the present invention is to make it possible to easily distinguish between forcible opening of the main contact due to leakage detection and forcible opening of the main contact due to phase loss detection. It is to provide a ground fault circuit breaker with protection.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1 is a case in which each pole of the main circuit is housed in each of three spaces partitioned by a partition, and a handle in which at least a part is rotatably exposed from the front of the case. And an opening / closing mechanism that opens and closes the main contacts of each pole in accordance with at least the operation of the handle, a leakage detection means that detects a leakage current flowing through the main circuit, and a switching mechanism that detects a leakage current detected by the leakage detection means. A phase loss is detected by a first electromagnetic release device that releases the main contact of each pole forcibly, a phase loss detection unit that detects a phase loss of a neutral wire, and a phase loss detection unit. And a second electromagnetic release device for releasing the open / close mechanism to forcibly open the main contact of each pole, and a state in which the first electromagnetic release device releases the open / close mechanism to open the main contact. The earth leakage display member and the second electromagnetic release device release the opening / closing mechanism. A phase loss display member for displaying a state in which the main contact is opened, and the first electromagnetic release device and the leakage display member are disposed in one of the two non-adjacent spaces among the three spaces, and the other A second electromagnetic release device and a phase loss display member are arranged, and a handle is arranged in the remaining one space between these two spaces.The open / close mechanism includes a latch member that interlocks with the opening and closing of the main contact, and a tripping member that latches the latch member in a state where the main contact is closed, and the second electromagnetic release device is provided with the phase loss detection means. A second electromagnet that is excited when an open phase is detected, and a second plunger that is moved by the excited second electromagnet to drive the tripping member to release the latch of the latch member; And a second stopper member for preventing the return of the second plunger driven in a state where the main contact is forcibly opened by the second electromagnetic release device, and the return of the second plunger is the second. In the state blocked by the stopper member, the tripping member is held at a position where the latch member is not latched by the second plunger.Thus, it is possible to easily discriminate between forced opening of the main contact due to leakage detection and forced opening of the main contact due to phase loss detection. In addition, the first electromagnetic release device and the earth leakage display member are disposed in one of the two spaces that are not adjacent to each other, and the second electromagnetic release device and the phase loss display member are disposed on the other side. Since the space can be used effectively, the leakage indication member and the missing phase indicator member can be distinguished at a glance because the leakage indicator member and the missing phase indicator member are respectively arranged in the spaces adjacent to the space where the handle is provided. In addition, since the first and second electromagnetic release devices are disposed in two spaces that are not adjacent to each other, it is difficult for the arc generated at each pole to enter the adjacent pole when the main contact is opened. Insulation improves.Here, if the handle is operated and the main contact is closed when an open phase occurs and the load balance is unbalanced, there is a risk that an overvoltage is applied to the load and the load breaks down. In the state where the return of the second plunger is prevented by the second stopper member, the tripping member is held at a position where the latch member is not latched by the second plunger. However, the main contact is not closed, and an overvoltage can be prevented from being applied to the load.
[0006]
According to a second aspect of the present invention, in the first aspect of the invention, the two display windows for exposing the leakage current display member and the open phase display member to the outside are respectively provided on the front surface of the case in a direction substantially orthogonal to the parallel direction of the three poles. It is characterized by opening at the same position, and looks good from the front of the case.
[0008]
  Claim3The invention of claim1 or 2According to the invention, the second plunger can be prevented from returning by operating the second stopper member from outside the case, and the second plunger can be operated by operating the second stopper member. Since the tripping member can be returned to the position where the latch member is latched by releasing, the main contact can be closed by operating the handle.
[0009]
  Claim4The invention of claimAny one of 1 to 3In the invention, the first electromagnetic release device includes a first electromagnet that is excited when a leakage current is detected by the leakage detection means, and a latch member that is moved by the excited first electromagnet to latch the latch member. A first plunger that drives the tripping member to release the first plunger, and prevents the return of the first plunger that is driven in a state where the main contact is forcibly opened by the first electromagnetic release device. The first stopper member is provided so that the first plunger is engaged with the first plunger so as to be freely disengaged, and the first plunger is removed from the first plunger in a state where the return of the first plunger is blocked by the first stopper member. In a state in which the first engagement portion having the first engagement portion and the second plunger are detachably engaged with each other and the return of the second plunger is blocked by the second stopper member, the latch member is not latched. Trip A second engagement portion of the thickness to hold the timber is characterized in that provided on the tripping member, just claim changing the first and second thickness of the engaging portion provided on the tripping member1Since the operation similar to that of the present invention can be achieved, the configurations of the first and second electromagnetic release devices can be made common.
[0010]
  Claim5The invention of claimAny one of 1 to 3In the invention, the first electromagnetic release device includes a first electromagnet that is excited when a leakage current is detected by the leakage detection means, and a latch member that is moved by the excited first electromagnet to latch the latch member. A first plunger that drives the tripping member to release the first plunger, and prevents the return of the first plunger that is driven in a state where the main contact is forcibly opened by the first electromagnetic release device. The first stopper member is provided, and the first and second engaging portions that are engaged with the first and second plungers so as to be freely engaged and disengaged are provided on the tripping member, and the first contact when the main contact is closed is provided. The distance between the second plunger and the second engaging portion when the main contact is closed is made narrower than the distance between the plunger and the first engaging portion. The second engaging part has the same structure Since that, the first and second electromagnetic release device, and leakage display member and the open phase display member is not space constraints that disposed, it is possible to freely select the two spaces not adjacent.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.
[0012]
The present embodiment is used for a main switch of a residential distribution board and has a synthetic resin case 1 formed in a rectangular parallelepiped shape. A terminal block 30 is formed at the upper end of the case 1, and three input terminals 3, 3, 3, each of which is formed of a screwed terminal having a terminal screw 32, are juxtaposed in the left-right direction. A single-phase three-wire neutral wire is connected to the central input terminal 3, and voltage lines are connected to the input terminals 3 and 3 on both sides. The terminal block 30 is formed with an insulating wall 35 that insulates between the adjacent input terminals 3 and 3. Further, as shown in FIG. 2, the terminal mounting portion 10 protrudes continuously and integrally from the right end portion of the upper end portion of the case 1, and the three output terminals 4, 4, 4 protrude from the right side surface of the terminal mounting portion 10. Are arranged in the form of Thus, the input terminals 3, 3, 3 and the output terminals 4, 4, 4 are associated with each other one by one, and the input terminals 3, 3, 3 are respectively connected to the voltage conductors and neutral wire conductors. (Not shown) is connected, and a conductive bar (not shown) serving as a bus is connected to each of the output terminals 4, 4 and 4 using a terminal screw. In addition, a storage portion 15 that stores a connection wire 7 to be described later is formed inside the terminal mounting portion 10, and the storage portion 15 and the terminal block 30 are partitioned by a partition wall 27.
[0013]
As shown in FIG. 1, in the case 1, three main contacts 26, 26, 26 arranged in parallel in the width direction of the case 1 (left and right direction in FIG. 1), the switching mechanism portion 5, and the main contact 26 , 26, and 26, a zero-phase current transformer CT that detects a leakage current such as a leakage current and a ground fault current flowing in an electric circuit (main circuit) inserted therein, and a main contact 26, 26, when the leakage current flows. The first electromagnetic release device 9A that operates the opening / closing mechanism 5 to forcibly open the opening 26 and the first electromagnetic release device 9A are controlled according to the detection output of the zero-phase current transformer CT. An earth leakage protection circuit 50; a second electromagnetic release device 9B that operates the switching mechanism 5 to forcibly open the main contacts 26, 26, 26 when a neutral wire phase loss occurs; An open phase protection circuit 51 that detects the open phase of the wire and controls the operation of the second electromagnetic release device 9B; The tripping devices 6 and 6 that actuate the opening / closing mechanism 5 to forcibly open the main contacts 26, 26, 26 when an abnormal current such as a short-circuit current or an overload current flows in the electric circuit are housed. The three-pole main contacts 26, 26, 26 can be opened and closed by a single handle 2 that is exposed on the front surface of the case 1.
[0014]
Here, the case 1 is composed of a body 1a whose front surface is open and a cover 1b that is covered on the front side of the body 1a. The body 1a is formed with a partition wall 28 that divides the internal space into each pole, and the cover 1b is similarly formed with a partition wall (not shown), and the case 1 can be assembled by joining the body 1a and the cover 1b. For example, the partition wall 28 on the body 1a side and the partition wall on the cover 1b side are abutted to form three spaces that insulate and store the three electric circuits including the main contact 26.
[0015]
The main contact 26 is a fixed contact 21 fixed to the tip of L-shaped contact holding pieces 33, 33, 33 extending from the lower edges of the terminal plates 31, 31, 31 of the input terminals 3, 3, 3. , 21, 21, and movable contacts 22, 22, 22. Here, the movable contacts 25 and 25 corresponding to the input terminals 3 and 3 on both sides connected to the voltage line are connected to the tripping devices 6 and 6 by connecting wires 7a and 7a made of braided wires, respectively, and further tripped. The devices 6 and 6 are connected to the output terminals 4 and 4 corresponding to the input terminals 3 and 3 through connecting wires 7b and 7b made of coated electric wires. The movable contact 25 corresponding to the central input terminal 3 connected to the neutral line is connected to the output terminal 4 corresponding to the input terminal 3 via the connection line 7b. Further, these connecting wires 7b, 7b, 7b are inserted through the through holes of the toroidal core of the zero-phase current transformer CT housed in the lower part of the case 1, and the case 1 along the lower surface and the right side surface inside the case 1. It is drawn around in an L-shaped storage portion 15 formed inside.
[0016]
A handle insertion hole 29 opening in a rectangular shape is formed at the center position of the front surface of the case 1 (front surface of the cover 1b), that is, the position facing the central space of the three spaces formed in the case 1. Further, in the vicinity of the handle insertion hole 29 inside the case 1, a frame 12 having bearing holes 12 e that receive both ends of the handle shaft 8 that pivotally supports the handle 2 is provided. The frame 12 is formed of a metal plate, and as shown in FIG. 3, a pair of side pieces 12a, 12a having substantially the same shape, a connecting piece 12b for connecting the side pieces 12a, 12a at their edges, and the side pieces 12a, 12a. And a fixing piece 12c projecting outward from the lower end edge. A screw hole 12d is formed in the fixed piece 12c, and is fixed by screwing to a mounting base (not shown) protruding from the bottom surface of the body 1a. The handle 2 is made of a synthetic resin molded product, and has an operation portion 2a that protrudes to the front surface of the case 1 through the handle insertion hole 29, and a bearing portion 2c that receives the handle shaft 8 is provided on the back surface of the operation portion 2a. A link bearing portion 2b that projects downward from the bearing portion 2c is provided. The operation portion 2a and the link support portion 2b are set so as to protrude from each other so as not to be in a straight line but to be substantially square. Thus, both ends of the handle shaft 8 inserted into the bearing portion 2c are inserted into the bearing holes 12e and 12e provided in the both side pieces 12a and 12a of the frame 12, so that the handle 2 is rotatably attached to the frame 12. It is done. That is, the handle 2 is located between the position where the operation portion 2a is substantially flush with the opening surface of the handle insertion hole 29 (see FIG. 6) and the position where the operation portion 2a protrudes from the handle insertion hole 29 (see FIG. 7). Thus, the handle shaft 8 is turned around the fulcrum so that it can be raised and lowered freely. Here, a handle return spring 16 comprising a hook-shaped spring is mounted on the outer periphery of the bearing portion 2 c of the handle 2, and a locking piece 16 a provided at one end of the handle return spring 16 is attached to one side piece 12 a of the frame 12. The handle 2 is hooked and locked in the formed hook groove 12j, and the handle 2 is urged by the spring force of the handle return spring 16 so that the operation portion 2a stands up from the front surface of the case 1.
[0017]
The opening / closing mechanism 5 includes a handle link 11, a latch plate 13, and a movable frame 17. As shown in FIG. 3, the handle link 11 has a pair of substantially strip-shaped leg pieces 11c and 11c, and a cylindrical drive shaft 11b bridged at the lower ends of the leg pieces 11c and 11c. , 11c, and link bearing holes 11a, 11a through which both ends of the link shaft 36 inserted through the shaft hole of the link bearing portion 2b of the handle 2 are inserted at the upper ends of the leg pieces 11c, 11c. Is formed. Both ends of the link shaft 36 protruding from the link bearing holes 11a, 11a to the outside of the leg pieces 11c, 11c are formed in both side pieces 12a, 12a of the frame 12 and projecting downward in an arcuate guide groove. The movement range of the handle link 11 is restricted by the guide grooves 12f and 12f.
[0018]
The latch plate 13 includes a latch piece 13a formed in a substantially square shape, and a pair of arm pieces 13b and 13b projecting in the same direction from both sides of the upper end of the latch piece 13a. The semi-circular bearing grooves 13c and 13c are formed at the tip end portions of the arm pieces 13b and 13b, and the shaft protrusions 12g and 12g provided on the opposing surfaces of the both side pieces 12a of the frame 12 are connected to the bearing grooves 13c. , 13c, the latch plate 13 is rotatably attached to the frame 12. The drive shaft 11b of the handle link 11 is in contact with the latch plate 13 and the central front end of the movable frame 17 (see FIG. 6).
[0019]
Further, as shown in FIG. 4, the movable frame 17 is made of a synthetic resin molded product having insulating properties, and a locking groove 17a into which the three movable contacts 25, 25, 25 are inserted and locked is arranged in parallel. Both ends of the first partition wall 27 and the inner wall surface facing the partition wall 27 are engaged with a groove portion 14 formed in the front-rear direction (a direction perpendicular to the paper surface in FIG. 1). It is accommodated in the case 1 so as to be movable in the vertical direction. On the other hand, the movable contacts 25, 25, 25 are locked to the locking piece 18 projecting from the inner bottom surface of the body 1 a at the end opposite to the movable contact 22, and to the locking groove 17 a of the movable frame 17. A portion between the portion locked by the locking piece 18 and the end portion locked by the locking piece 18 is biased forward of the case 1 by the coil spring 19. One end of the coil spring 19 is inserted into a protrusion 20 projecting between the groove 14 on the inner bottom surface of the body 1 a and the locking piece 18, and the other end is in contact with the movable contact 25.
[0020]
The tripping member 60 includes a base piece 60a disposed along the left-right width direction of the case 1 so as to straddle the three movable contacts 25, 25, 25 as shown in FIGS. 3 and 6, and a base piece 60a. The substantially L-shaped leg piece 60b projecting downward from the substantially central edge in the longitudinal direction, and the substantially triangular drive pieces 60c, 60e projecting laterally from the vicinity of both ends in the longitudinal direction of the base piece 60a. In addition, first and second engaging portions 60d and 60f projecting substantially parallel to the longitudinal direction of the base piece 60a from the distal end portions of the drive pieces 60c and 60e are integrally formed of synthetic resin. Further, a bearing portion 60g having a bearing hole through which the rotating shaft 37 is inserted is formed at a bent portion of the leg piece 60b, and the bearing portion 60g is formed in the bearing holes 12i and 12i formed in the both side pieces 12a of the frame 12. The tripping plate 60 is rotatably attached to the frame 12 by supporting the ends of the rotating shaft 37 protruding from both ends of the frame. Here, a tripping member return spring 61 made of a hook-shaped spring is mounted on the outer periphery of the bearing portion 60g, and a locking piece 61a provided at one end of the tripping member return spring 61 is one side piece of the frame 12. The tripping member 60 is biased in the direction in which the leg piece 60b approaches the latch plate 13 (clockwise in FIG. 6) by the spring force of the tripping member return spring 61.
[0021]
Thus, as shown in FIG. 7, when the handle 2 is rotated so that the operation portion 2 a is turned down from the state where the main contact 26 is opened (open state), the link bearing portion 2 b is tilted toward the latch plate 13. Accordingly, the handle link 11 is rotated clockwise in FIG. 7 with the link shaft 36 as a fulcrum. As the handle link 11 rotates, the drive shaft 11b of the handle link 11 moves toward the movable contact 25 (downward in FIG. 6) while sliding on the latch piece 13a of the latch plate 13, and the coil spring 19 is moved. The movable contact 25 is moved downward by pushing the movable frame 17 downward against the spring force. When the link shaft 36 moves to the latch plate 13 side (the right side in FIG. 6) from the straight line connecting the handle shaft 8 and the drive shaft 11b of the handle link 11, the lower end portion of the latch plate 13 is the leg of the tripping member 60. The handle 2 is held at a position where the operation portion 2a is substantially flush with the opening surface of the handle insertion hole 29 because it is abutted and latched to the tip of the piece 60b. At this time, since the movable frame 17 is pressed downward by the drive shaft 11b of the handle link 11, the three movable contacts 25, 25, 25 locked in the locking grooves 17a of the movable frame 17 are also pushed downward. Then, as shown in FIG. 6, the movable contact 22 fixed to the distal end portion of each movable contact 25 comes into contact with the opposed fixed contact 21, and the main contact 26 is closed (closed state). In contrast to the above description, if the handle 2 is rotated in the direction in which the operation portion 2a is raised from the closing state shown in FIG. 6, the drive shaft 11b of the handle link 11 moves forward, and the spring of the coil spring 19 is moved. Since the movable frame 17 moves upward by force, the movable contact 22 is separated from the fixed contact 21 and the main contact 26 is opened, and the open state shown in FIG. 7 is obtained. As shown in FIG. 3, the operation portion 2a of the handle 2 is provided with a protrusion 2d protruding substantially from the center on one end side, and the upper end of the latch piece 13a of the latch plate 13 in the open state in which the main contact 26 is opened. The protrusion 2d abuts on the edge (see FIG. 7), and the rotation of the latch plate 13 is restricted.
[0022]
In the open / close mechanism 5 configured as described above, if a leakage current flows through the main circuit in the closed state of the main contact 26, the first electromagnetic release device 9A is actuated to cause an open phase in the neutral wire. For example, if an abnormal current such as a short-circuit current or an overload current flows due to the operation of the second electromagnetic release device 9B, the tripping member 60 is driven by the operation of the tripping devices 6 and 6 to latch the latch plate 13 Is released so that the main contact 26 is forcibly opened.
[0023]
As shown in FIG. 4, the first electromagnetic release device 9 </ b> A is moved by the first electromagnet that is energized and excited by the output of the leakage protection circuit 50, and is moved by the excited first electromagnet. And a first plunger 93A for driving the tripping member 60 so as to release the latched state. The first electromagnet includes a coil 90 that is energized and energized by the output of the leakage protection circuit 50, and a coil frame 91 that is formed in a cylindrical shape having openings at both ends by an insulating material and on which the coil 90 is wound outside. And a yoke 92 formed in a substantially U shape that opens upward by a magnetic body, and the first plunger 93A is inserted into the coil frame 91 so as to be able to appear and retract. The coil frame 91 is formed in a rectangular tube shape having outer flanges 91a and 91b at both axial ends, and a coil terminal 91c for connecting a terminal of the coil 90 to both ends in a direction orthogonal to the axial direction of one outer flange 91b. , 91 c are implanted, and these terminals 91 c, 91 c are connected to the leakage protection circuit 50. In the leakage protection circuit 50, as described later, when the output of the secondary winding of the zero-phase current transformer CT exceeds a predetermined level, the coil 90 is energized and excited. Further, a protrusion 95 is provided integrally with the coil frame 91 on the right side of the outer casing 91b of the coil frame 91 in FIG. The protrusion 95 has a stopper member insertion hole 95a through which a first stopper member 94A described later is inserted so as to be movable in the vertical direction, and a support base 95b that supports the fixed contact plate 96 constituting the test switch. The inside communicates with the internal cavity of the coil frame 91 and the end is opened. A fixed contact plate 96 is supported on the support base 95b of the protrusion 95, and a base end portion 97a of a movable contact plate 97 formed by bending a belt-plate-like conductive member into a substantially square shape is fixed. The contact portion 97b at the tip of the movable contact plate 97 and the fixed contact plate 96 face each other so as to be freely contacted and separated. Thus, the fixed contact plate 96 and the movable contact plate 97 constitute a test switch SW. As will be described later, the contact portion 97b of the movable contact plate 97 bent by the pressing operation of the test button 42 is a fixed contact. When the test switch SW is turned on in contact with the plate 96 and the test switch SW is turned on, an unbalanced current is supplied to the zero-phase current transformer CT to create a pseudo-leakage state.
[0024]
The first stopper member 94A is formed of a synthetic resin in a rectangular flat plate shape, and as shown in FIG. 4, a main body 94a having an insertion window 94c through which the first plunger 93A is inserted at the center, and one end side corner of the main body 94a. The arm portion 94b is provided so as to be further lowered and the engaging protrusion 94d protrudes from the tip portion. Also, a mounting protrusion 94e is formed from the inner peripheral surface of the main body 94a in front of the insertion window 94c so as to protrude downward in FIG. Thus, the attachment protrusion 94e is fitted and attached to one end of the stopper member return spring 98 made of a coil spring, and the first stopper member 94A is inserted into the stopper member insertion hole 95a of the protrusion 95 from the arm portion 94b side. Is inserted, the other end of the stopper member return spring 98 is locked to the locking step portion 95c formed on the inner wall surface of the stopper member insertion hole 95a, and the stopper member return spring 98 biases it in the anti-insertion direction. In this state, the first stopper member 94A is attached to the protrusion 95.
[0025]
The first plunger 93A is formed by bending a magnetic metal plate, and as shown in FIG. 4, the main portion 93a having a substantially U-shaped cross section that opens downward, and substantially outward from the right end surface of the main portion 93a. Leg pieces 93b, 93b that are opened in a letter shape are integrally formed. Here, the driving piece 93c is integrally formed at the lower end by bending one leg piece 93b into a substantially bowl shape. Thus, the left end of the main portion 93a inserted into the plunger return spring 99 made of a coil spring passes through the insertion window 94c of the first stopper member 94A attached to the projection 95 from the opening of the projection 95. By inserting the coil frame 91 up to the inside, the first plunger 93 </ b> A can be projected and retracted through the opening of the protrusion 95 from the opening on the right end side of the coil frame 91. Here, as shown in FIG. 10, the inside of the projection 95 is composed of a large-diameter part on the opening side and a small-diameter part on the coil frame 91 side, and the plunger return spring 99 inserted into the large-diameter part from the opening is a small-diameter part. Between the opening peripheral edge of the first plunger 93A and the leg pieces 93b of the first plunger 93A in a compressed state. The plunger return spring 99 biases the first plunger 93A in the direction opposite to the coil frame 91. The Further, the first stopper member 94A has a peripheral edge portion 94f behind the insertion window 94c of the main body 94a in contact with the open end edge of the main portion 93a of the first plunger 93A so that the first stopper member 94A is prevented from coming off from the stopper member insertion hole 95a. It has been.
[0026]
As shown in FIG. 4, the yoke 92 is attached to the rear side of the coil frame 91 so that both side pieces 92 a and 92 a abut against the outer casings 91 a and 91 a along the axial direction of the coil 90. Here, an escape groove 92b for allowing the first plunger 93A to escape is formed in the side piece 92a on the right end side, and the first plunger 93A is inserted into the coil frame 91 through the escape groove 92b. Further, the left end side piece 92a is formed to have a dimension that covers about half of the opening on the upper end side of the coil frame 91, and through this opening, the left end portion of the first plunger 93A and the left end side piece of the yoke 92 are formed. 92a is opposed.
[0027]
By the way, the earth leakage display member 100A is attached to the upper end portion of the first plunger 93A via the connecting portion 101. As will be described later, the earth leakage display member 100 slides between the earth leakage display position and the non-leakage display position in conjunction with the first plunger 93A, and is formed in a rectangular plate shape by a nonmagnetic material. On the right side, characters representing a leakage state (for example, two characters “leakage”) are displayed by an appropriate method such as printing. In addition, a substantially L-shaped connecting portion 101 is integrally formed from the center of the left end edge of the earth leakage display member 100, and the earth leakage display member 100 and the connecting portion 101 as a whole are substantially U-shaped. The connecting portion 101 has a width dimension that can be inserted into the coil frame 91, and a fixed portion 102 that is fixed to the first plunger 93 </ b> A is integrally formed at the tip. The fixing portion 102 is narrower than the connecting portion 101 and has a tip portion that is bifurcated. Engaging claws 102a and 102a project from both end edges. On the other hand, from the left end edge of the main portion 93 of the first plunger 93A, three attachment claws 93d, 93d, and 93d are provided to hold the fixing portion 102 in the front-rear direction, and the engaging claws 102a of the fixing portion 102 are provided. , 102a are formed on the upper portion of the main portion 93a.
[0028]
Thus, as shown in FIG. 10, the earth leakage display member 100 is fixed from the gap between the opening edge on the left end side of the coil frame 91 and the front end edge of the side piece 92 a of the yoke 92 in a direction in which the current leakage display member 100 is positioned in front of the coil frame 91. The portion 102 and the connecting portion 101 are inserted into the inside of the coil frame 91, the fixing claws 102 are held between the mounting claws 93d, 93d, 93d of the first plunger 93A, and the engaging claws 102a, 102a are engaged with the engaging grooves 93e, By engaging with 93e, the fixing portion 102 is fixed to the first plunger 93A in a retaining state. As a result, the connecting portion 101 projecting from the opening on the left end side of the coil frame 91 is folded back to the front side of the coil frame 91 so as to straddle the outer casing 91a, and the electric leakage display member 100 is disposed substantially parallel to the front surface of the coil frame 91. Will be. However, when the first plunger 93A moves in the direction of coming out of the inside of the coil frame 91, as shown in FIG. 12, the connecting portion 101 comes into contact with the outer flange 91a of the coil frame 91 to prevent the first plunger 93A from coming off. Figured.
[0029]
As shown in FIG. 4, the second electromagnetic release device 9B and the second stopper member 94B have the same configuration as the first electromagnetic release device 9A and the first stopper member 94A, respectively. The same reference numerals are given and description thereof is omitted. The phase loss display member 110 has the same configuration as the leakage current display member 100, and slides between the phase loss display position and the non-phase loss display position in conjunction with the second plunger 93B as will be described later. Thus, the second plunger 93B is attached to the left end portion via the connecting portion 111. The phase loss display member 110 is formed of a non-magnetic material in a rectangular plate shape, and characters representing the phase failure state (for example, two characters “phase loss”) are displayed on the front right side portion by an appropriate method such as printing. Yes.
[0030]
On the other hand, as shown in FIG. 4, the movable frame 17 is formed with concave grooves 17b and 17d into which the arm portions 94b and 94b of the first stopper member 94A and the second stopper member 94B are inserted so as to be able to advance and retract, respectively. In addition, engaging projections 17c and 17e are formed at the front ends of the concave grooves 17b and 17d to engage and prevent the engaging projections 94d and 94d at the tips of the arms 94b and 94b from coming off.
[0031]
The first electromagnetic release device 9A and the earth leakage display member 100 configured as described above, and the second electromagnetic release device 9B and the open phase display member 110 are formed in the case 1 as shown in FIG. Each of the two spaces is disposed in a space at both ends that are not adjacent to each other (a space in which a pole connected to the voltage line is stored). At this time, as shown in FIG. 2, the earth leakage display member 100 faces the display window 40A formed on the front surface of the case 1, and the phase loss display member 110 faces the display window 40B also formed on the front surface of the case 1. A movable contact plate 97 constituting the test switch SW is opposed to the test button 42 disposed so as to be pushed into the front surface of the case 1. Here, the two display windows 40A and 40B are arranged at substantially the same position on the front surface of the case 1 in the direction (vertical direction in FIG. 2) substantially orthogonal to the parallel direction of the three poles (width direction of the case 1), that is, the case. Since the distance from the lower end of 1 to the lower end edges of the display windows 40A and 40B is substantially equal, the appearance viewed from the front of the case 1 is improved.
[0032]
FIG. 5 shows a circuit diagram of a leakage protection circuit 50 that drives the first electromagnetic release device 9A, an open phase protection circuit 51 that drives the second electromagnetic release device 9B, and a test circuit 52 for leakage test. In the leakage protection circuit 50, the output of the secondary winding of the zero-phase current transformer CT is converted into a voltage and input to the detection terminal of the leakage protection IC 50a. Is exceeded, leakage detection is performed by the leakage protection IC 50a, and a leakage detection signal is output from the output terminal. The leakage detection signal turns on the thyristor SCR1, and passes an exciting current through the coil 90 of the first electromagnetic release device 9A. Thus, the main contact 26 is opened to protect the load. Further, the test circuit 52 includes a lead wire Lx inserted through a through hole of a toroidal core of a normally open test switch SW, a resistor RT, and a zero-phase current transformer CT between two input terminals T1 and T2 connected to a voltage electrode. When the test switch SW is turned on, a current is passed through the lead wire Lx to cause an unbalanced current to flow through the zero-phase current transformer CT, thereby creating a pseudo electric leakage state.
[0033]
On the other hand, in the phase loss protection circuit 51, the input voltage from the input terminals T1 and T2 is full-wave rectified by the diode bridge DB and input to the phase loss protection IC 51a, and from the input terminal T3 connected to the neutral line. The detection line Ln is connected to the voltage dividing point of the voltage dividing resistors R8 and R9 connected between the input terminals T1 and T2, and this voltage dividing point is further detected by the IC 51a for phase loss protection through the resistors R5, R6, R12 and R13. It is connected to the terminal. As for the voltage of the detection terminal, when the power supply and the load are normally connected, a pulsating voltage with uniform amplitude will appear. However, if the neutral line is disconnected and a phase loss occurs, the two voltage lines A pulsating voltage that alternately increases and decreases depending on the voltage division ratio due to the load of each phase. When the potential of this detection terminal exceeds a predetermined level, the phase loss detection IC 51a detects the phase loss and the phase loss detection signal is output to the output terminal. The thyristor SCR2 is turned on by this open phase detection signal, and the main contact 26 is opened by applying an exciting current to the coil 90 of the second electromagnetic release device 9B to protect the load. The leakage protection circuit 50, the phase failure protection circuit 51, and the test circuit 52 are configured by mounting circuit components such as a leakage protection IC 50a and a phase failure protection IC 51a on a rectangular flat printed circuit board 53, as shown in FIG. Further, as shown in FIG.
[0034]
Next, the operation of the first electromagnetic release device 9A configured as described above will be described. First, when no leakage current flows in the main circuit, an unbalanced current does not flow to the secondary side of the zero-phase current transformer CT as shown in FIG. Therefore, since the coil 90 is not excited, the first plunger 93A protrudes from the inside of the coil frame 91 by the spring force of the plunger return spring 99, and stops at a position where the connecting portion 101 contacts the outer flange 91a of the coil frame 91. To do. At this time, the movable frame 17 is pushed down by the handle link 11 and moves downward in FIG. 9 to close the main contact 26. The first stopper member 94A is pulled downward in accordance with the movement of the movable frame 17 because the engagement projection 94d of the arm portion 94b is engaged with the engagement projection 17c of the movable frame 17. . In this state (normal state), the driving piece 93c of the first plunger 93A is inserted into the groove 60h provided in the base piece 60a of the tripping member 60 so as not to interfere with the tripping member 60. . At this time, the leakage display member 100 connected to the first plunger 93A by the connecting portion 101 is at one end position (the right end position in FIG. 9) of the movement range that is the non-leakage display position, and the front surface of the case 1 The display window 40A provided on the left side of the front surface of the leakage current display member 100, that is, a portion not marked with a letter indicating the leakage state, is displayed through the display window 40A and is in a non-leakage state (normal state). The
[0035]
On the other hand, if an unbalanced current flows on the secondary side of the zero-phase current transformer CT due to the occurrence of a ground fault, the output of the leakage protection circuit 50 causes the coil 90 of the first electromagnetic release device 9A to be applied as described above. Energized. When the coil 90 is energized by energization, an attractive force acts on the first plunger 93A so as to reduce the magnetic resistance of the magnetic path passing through the coil 90-first plunger 93A-yoke 92, and the plunger return spring 99. The first plunger 93 </ b> A is drawn into the coil frame 91 against the spring force and moves to the left in FIG. 9. When the first plunger 93A moves to the left, the driving piece 93c of the first plunger 93A engages with the first engagement portion 60d of the tripping member 60, and the first engagement portion 60d is projected. A leftward force in FIG. 9 is applied to the driving piece 60c. The leftward force causes the tripping member 60 to rotate counterclockwise in FIG. 9 against the spring force of the tripping member return spring 61, and the leg piece 60 b of the tripping member 60 and the tip of the latch plate 13. Is unlatched. Then, as shown in FIG. 8, the handle link 11 that is no longer supported by the latch plate 13 moves in a direction approaching the latch plate 13 (rightward in FIGS. 8 and 9), and the link shaft 36 moves between the handle shaft 8 and the handle link 11. The handle 2 is moved to the movable frame 17 side (left side in FIG. 8) from the straight line connecting to the drive shaft 11b, so that the handle 2 is rotated in the standing direction (clockwise in FIG. 8) by the spring force of the handle return spring 16, Accordingly, the drive shaft 11b of the handle link 11 moves leftward in FIG. Therefore, the pressing force to the movable frame 17 by the handle link 11 does not act, and the movable contact 25 and the movable frame 17 are also moved upward in FIG. (See FIG. 10). Further, the engagement of the engagement projection 94d of the arm portion 94b and the engagement projection 17c of the movable frame 17 is released by the upward movement of the movable frame 17, and the first stopper member is caused by the spring force of the stopper member return spring 98. 94A moves upward, and the peripheral edge portion 94f of the main body 94a of the first stopper member 94A engages with a concave groove-like engaging portion 93f formed on the lower end side of the main portion 93a of the first plunger 93A. At this time, as the first plunger 93A moves to the right, the leakage display member 100 moves to the other end position (left end position in FIG. 10) of the movement range that is the leakage display position, The display window 40A faces the right front portion of the leakage display member 100, that is, a portion where a character indicating the leakage state is present, and it is displayed that the leakage state is present through the display window 40A. The display window 40A is fitted with a lens 41 for enlarging the leakage display character, so that the leakage display character is easy to see.
[0036]
On the other hand, if the main contact 26 is opened, an unbalanced current does not flow on the secondary side of the zero-phase current transformer CT, the energization by the leakage protection circuit 50 is stopped, the coil 90 is not excited, and the first plunger 93A. The first plunger 93A tries to move in the right direction in FIG. 10 by the spring force of the plunger return spring 99, but the peripheral portion of the main body 94a of the first stopper member 94A as described above. Since 94f engages with the engaging portion 93f formed on the lower end side of the main portion 93a of the first plunger 93A, the movement of the first plunger 93A is slightly caused by the first stopper member 94A as shown in FIG. The earth leakage display member 100 stops at the earth leakage display position. Here, as described above, when the first plunger 93A slightly moves rightward due to the opening of the main contact 26, the leftward force by the driving piece 93c of the first plunger 93A is driven by the driving piece 60c of the tripping member 60. Therefore, the tripping member 60 is rotated clockwise in FIG. 11 by the spring force of the tripping member return spring 61 to return to the original position. In other words, since the thickness (diameter direction dimension) t1 of the first engaging portion 60d is set so that the tripping member 60 can be returned to the original position after the main contact 26 is forcibly opened due to leakage detection. is there. Thus, if the reset operation for closing the main contact 26 by operating the handle 2 as described above is performed, the engagement between the engaging projection 94d of the arm portion 94b and the movable frame 17 is caused by the downward movement of the movable frame 17. The mating protrusion 17c engages, the first stopper member 94A moves downward against the spring force of the stopper member return spring 98, and the peripheral portion 94f of the main body 94a of the first stopper member 94A and the first The plunger 93A is disengaged from the engaging portion 93f, and the first plunger 93A moves rightward by the spring force of the plunger return spring 99 to return to the input state of FIG.
[0037]
Next, the operation of the second electromagnetic release device 9B will be described. First, in a normal state in which no phase loss of the neutral wire occurs, the phase loss protection circuit 51 does not energize the coil 90 as shown in FIG. The second plunger 93 </ b> B protrudes from the inside of the coil frame 91 due to the force, and stops at a position where the connecting portion 101 contacts the outer flange 91 a of the coil frame 91. At this time, the movable frame 17 is pushed down by the handle link 11 and moves downward in FIG. 12 to close the main contact 26. The second stopper member 94B is pulled downward in accordance with the movement of the movable frame 17 because the engagement projection 94d of the arm portion 94b is engaged with the engagement projection 17e of the movable frame 17. . In this state (normal state), the driving piece 93c of the first plunger 93B is inserted into the recess 60i provided in the base piece 60a of the tripping member 60 so as not to interfere with the tripping member 60. At this time, the phase loss display member 110 connected to the second plunger 93B by the connecting portion 101 is at one end position (right end position in FIG. 12) of the movement range that is the non-phase loss display position. The display window 40B provided on the front side of the front panel faces the left side of the front surface of the phase loss display member 110, that is, a portion not marked with a letter indicating the phase loss state, and is in a non-phase loss state (normal state) through the display window 40B. It is displayed.
[0038]
On the other hand, if the neutral line is lost, the coil 90 of the second electromagnetic release device 9B is energized by the output of the open phase protection circuit 51 as described above. When the coil 90 is energized by energization, an attractive force acts on the second plunger 93B so as to reduce the magnetic resistance of the magnetic path passing through the coil 90-second plunger 93B-yoke 92, and the plunger return spring 99. The second plunger 93 </ b> B is drawn into the coil frame 91 against the spring force and moves to the left in FIG. 12. When the second plunger 93B moves to the left, the drive piece 93c of the second plunger 93B engages with the second engagement portion 60f of the tripping member 60, and the second engagement portion 60f is projected. A leftward force in FIG. 12 is applied to the driving piece 60e. Due to this leftward force, the tripping member 60 rotates counterclockwise in FIG. 12 against the spring force of the tripping member return spring 61, and the leg piece 60 b of the tripping member 60 and the tip of the latch plate 13 Is unlatched. Then, as in the case of the first electromagnetic release device 9A, the pressing force to the movable frame 17 by the handle link 11 does not act, and the movable contact 25 and the movable frame 17 are also moved by the spring force of the coil spring 19 as shown in FIG. And the main contact 26 is forcibly opened (tripped) (see FIG. 13). Further, the engagement of the engagement projection 94d of the arm portion 94b and the engagement projection 17e of the movable frame 17 is disengaged by the upward movement of the movable frame 17, and the second stopper member is caused by the spring force of the stopper member return spring 98. 94B moves upward, and the peripheral edge portion 94f of the main body 94a of the second stopper member 94B engages with a concave groove-like engaging portion 93f formed on the lower end side of the main portion 93a of the second plunger 93B. At this time, with the movement of the second plunger 93B to the right, the phase loss display member 110 moves to the other end position (left end position in FIG. 13) of the movement range that is the phase loss display position. A front right side portion of the phase loss display member 110, that is, a portion where characters indicating a phase loss state are faced to the front display window 40B, and a phase loss state is displayed through the display window 40B. The display window 40B is also fitted with a lens 41 for enlarging the phase-indicating characters, making it easy to see the phase-indicating characters.
[0039]
On the other hand, if the main contact 26 is opened, the energization by the phase loss protection circuit 51 stops, the coil 90 is no longer excited, and no attractive force acts on the second plunger 93B. The second plunger 93B tries to move in the right direction in FIG. 13, but the peripheral portion 94f of the main body 94a of the second stopper member 94B is the main portion of the second plunger 93B as in the case of the first electromagnetic release device 9A. In order to engage with the engaging portion 93f formed on the lower end side of 93a, the movement of the second plunger 93B is restricted to a slight distance by the second stopper member 94B as shown in FIG. 110 stops at the open phase display position. However, as described above, even if the second plunger 93B slightly moves rightward due to the opening of the main contact 26, the leftward force by the driving piece 93c of the second plunger 93B is driven by the driving piece of the tripping member 60. Since it still acts on 60e, the tripping member 60 cannot return to its original position. In other words, the thickness t2 of the second engaging portion 60f is set so that the tripping member 60 cannot return to the original position after the forced opening of the main contact 26 by the phase loss detection (t1). <T2). Thus, in this case, even if the handle 2 is operated, the engagement projection 94d of the arm portion 94b and the engagement projection 17e of the movable frame 17 are not engaged, and the main contact 26 is forcibly opened by detecting the phase loss. Cannot be reset. In other words, if the main contact 26 is closed by operating the handle 2 when an open phase occurs and the load balance is unbalanced, an overvoltage may be applied to the load and the load may break down. In the embodiment, in the state where the return of the second plunger 93B is blocked by the second stopper member 94B, the tripping member 60 is held at a position where the latch member 13 is not latched by the second plunger 93B. Even if the handle 2 is operated, the main contact 26 is not closed, and an overvoltage can be prevented from being applied to the load.
[0040]
On the other hand, the reset when the main contact 26 is forcibly opened by the second electromagnetic release device 9B is performed as follows. That is, a thin rod-shaped jig is inserted from the reset hole 43 provided in the front surface of the case 1 facing the second stopper member 94B, and the upper end of the main body 94a of the second stopper member 94B is pressed by the tip of the jig. Thus, if the second stopper member 94B is moved downward in FIG. 14 against the spring force of the stopper member return spring 98, the peripheral portion 94f of the main body 94a of the second stopper member 94B and the second plunger 93B disengages from the engaging portion 93f, the second plunger 93B moves to the right by the spring force of the plunger return spring 99, and the second electromagnetic release device 9B returns to the normal state. As a result, the leftward force from the driving piece 93c of the second plunger 93B does not act on the driving piece 60e of the tripping member 60, so that the tripping member 60 is moved by the spring force of the tripping member return spring 61 in FIG. It rotates around and returns to its original position as shown in FIG. In this state, if the reset operation for closing the main contact 26 is performed by operating the handle 2, the main contact 26 shown in FIG.
[0041]
The present embodiment is configured as described above, and the first electromagnetic release device 9A and the earth leakage display member 100 are arranged in one of two spaces that are not adjacent to each other among the three spaces provided in the case 1. In addition, the second electromagnetic release device 9B and the phase loss display member 110 are disposed on the other side, and the handle 2 is disposed in a central space sandwiched between these two spaces. Can be easily discriminated from the forced opening of the main contact 26 by the phase loss detection. In addition, the first electromagnetic release device 9A and the leakage display member 100 are disposed in one of the two spaces that are not adjacent to each other, and the second electromagnetic release device 9B and the phase loss display member 110 are disposed on the other. Since the space in the case 1 can be used effectively, and the leakage current display member 100 and the phase loss display member 110 are respectively disposed in the spaces adjacent to the space where the handle 2 is disposed, There is an advantage that the display can be distinguished at a glance. Furthermore, since the first and second electromagnetic release devices 9A and 9B are arranged in two non-adjacent spaces, the arc generated at each pole when the main contact 26 is opened is adjacent to the adjacent pole. There is also an advantage that it is difficult to wrap around and the insulation is improved.
[0042]
(Embodiment 2)
In the first embodiment, the tripping member 60 cannot be returned to the original position after the main contact 26 is forcibly opened by detecting the phase loss in order to prevent an erroneous reset due to the operation of the handle 2 after the phase loss protection. Thus, the thickness t2 of the second engaging portion 60f is set. As a result, the first electromagnetic release device 9A and the second electromagnetic release device 9B can have the same configuration, and costs can be reduced by sharing parts. On the other hand, in the present embodiment, the thicknesses of the first and second engaging portions 60d and 60f provided on the tripping member 60 are the same in order to prevent erroneous reset due to the operation of the handle 2 after phase loss protection. Further, the second plunger 93B and the second engaging portion 60f when the main contact 26 is closed with respect to the distance between the first plunger 93A and the first engaging portion 60d when the main contact 26 is closed. (See FIGS. 16 and 19).
[0043]
Thus, the drive pieces 93c and 93c of the first and second plungers 93A and 93B that engage with the first and second engaging portions 60d and 60f, respectively, bend the leg pieces 93b and 93b into a substantially bowl shape. For example, by changing the angle at which the leg pieces 93b and 93b are bent, the base end of the leg piece 93b coupled to the main portion 93a of the first plunger 93A as shown in FIG. 19, the distance W2 from the base end of the leg piece 93b coupled to the main portion 93a of the second plunger 93B to the drive piece 93c is shortened as shown in FIG. 19 (W2 <W1). )doing. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to common components, and descriptions thereof are omitted.
[0044]
That is, the first electromagnetic release device 9A operates in the same manner as in the first embodiment. After the main contact 26 is forcibly opened due to leakage detection, the leftward force in FIG. 17 by the driving piece 93c of the first plunger 93A is pulled. Since it does not act on the drive piece 60c of the detaching member 60, the detaching member 60 is rotated clockwise in FIG. 17 by the spring force of the detaching member return spring 61 and returns to the original position as shown in FIG. .
On the other hand, with respect to the second electromagnetic release device 9B, as shown in FIG. 20, when the main contact 26 is forcibly opened due to the phase loss detection, the energization by the phase loss protection circuit 51 is stopped and the coil 90 is no longer excited. No suction force is applied to the plunger 93B of the second plunger 93B, and the second plunger 93B tries to move in the right direction in FIG. 20 by the spring force of the plunger return spring 99. However, as in the first embodiment, the second stopper member 94B Since the peripheral edge portion 94f of the main body 94a engages with the engaging portion 93f of the second plunger 93B, the movement of the second plunger 93B is restricted to a slight distance by the second stopper member 94B as shown in FIG. The As described above, even if the second plunger 93B slightly moves rightward due to the opening of the main contact 26, the leftward force by the driving piece 93c of the second plunger 93B is driven by the driving piece of the tripping member 60. Since it still acts on 60e, the tripping member 60 cannot return to its original position. In other words, from the base end of the leg piece 93b coupled to the main portion 93a of the second plunger 93B so that the tripping member 60 cannot return to the original position after the forced contact opening of the main contact 26 by the phase loss detection. The distance W2 to the drive piece 93c is set. Therefore, in this case, even if the handle 2 is operated, the engaging protrusion 94d of the arm portion 94b and the engaging protrusion 17e of the movable frame 17 are not engaged, and the forced opening of the main contact 26 due to the phase loss detection is reset. Therefore, even if the handle 2 is operated, the main contact 26 is not closed, and an overvoltage can be prevented from being applied to the load. In addition, since the reset procedure of the 2nd electromagnetic release apparatus 9B in this embodiment is common in Embodiment 1, description is abbreviate | omitted.
[0045]
Thus, in the present embodiment, the first electromagnetic release device 9A and the second electromagnetic release device 9B cannot have the same configuration, but the first and second provided on the driving pieces 60c and 60e of the tripping member 60 are not possible. Since the thickness dimensions of the engaging portions 60d and 60f can be made the same, the space for arranging the first and second electromagnetic release devices 9A and 9B and the leakage current display member 100 and the phase loss display member 110 is limited. The two spaces that are not adjacent to each other can be freely selected. That is, in the first embodiment and the present embodiment, the first electromagnetic release device 9A and the earth leakage display member 100 are disposed in the right space with respect to the central space in FIG. 1, and the left space with respect to the central space. The second electromagnetic release device 9B and the phase loss display member 110 are arranged on the left side, but the first electromagnetic release device 9A and the leakage display member 100 are arranged in the left space by reversing this. Even if the second electromagnetic release device 9B and the phase loss display member 110 are disposed in the space, the same operation can be performed.
[0046]
【The invention's effect】
  According to the first aspect of the present invention, there are provided a case in which each pole of the main circuit is housed in three spaces divided by partition walls, a handle that is at least partially exposed from the front of the case so as to be rotatable, and at least in response to an operation of the handle. An open / close mechanism that opens and closes the main contact of each pole, a leakage detection means that detects a leakage current flowing through the main circuit, and a main contact of each pole that releases the switching mechanism when the leakage current is detected by the leakage detection means A first electromagnetic release device that forcibly opens the phase, a phase loss detection means for detecting a phase loss of the neutral wire, and a release mechanism when the phase loss detection means detects the phase loss, A second electromagnetic release device that forcibly opens the main contact of the pole, an earth leakage display member that displays a state in which the first electromagnetic release device releases the switching mechanism to open the main contact, The electromagnetic release device releases the switching mechanism and opens the main contact. The first electromagnetic release device and the leakage display member are disposed in one of two spaces that are not adjacent to each other among the three spaces, and the second electromagnetic release device and the open phase are provided on the other. A display member is arranged, and a handle is arranged in the remaining space between these two spaces.The open / close mechanism includes a latch member that interlocks with the opening and closing of the main contact, and a tripping member that latches the latch member in a state where the main contact is closed, and the second electromagnetic release device is provided with the phase loss detection means. A second electromagnet that is excited when an open phase is detected, and a second plunger that is moved by the excited second electromagnet to drive the tripping member to release the latch of the latch member; And a second stopper member for preventing the return of the second plunger driven in a state where the main contact is forcibly opened by the second electromagnetic release device, and the return of the second plunger is the second. In the state blocked by the stopper member, the tripping member is held at a position where the latch member is not latched by the second plunger.Therefore, it is possible to easily discriminate between the forced opening of the main contact due to the leakage detection and the forced opening of the main contact due to the phase loss detection, and the first electromagnetic release device and the leakage display member in one of the two adjacent spaces. Since the second electromagnetic release device and the phase loss display member are provided on the other side, the space in the case can be used effectively, and the leakage current is displayed in the space adjacent to the space where the handle is provided. Since the member and the phase loss display member are respectively provided, there is an effect that the leakage display and the phase loss display can be distinguished at a glance. In addition, since the first and second electromagnetic release devices are disposed in two spaces that are not adjacent to each other, it is difficult for the arc generated at each pole to enter the adjacent pole when the main contact is opened. There is an effect that insulation is improved.Here, if the handle is operated and the main contact is closed when an open phase occurs and the load balance is unbalanced, there is a risk that an overvoltage is applied to the load and the load breaks down. Then, in the state where the return of the second plunger is prevented by the second stopper member, the tripping member is held at a position where the latch member is not latched by the second plunger. There is an effect that the main contact is not closed and an overvoltage is prevented from being applied to the load.
[0047]
According to a second aspect of the present invention, in the first aspect of the invention, the two display windows for exposing the leakage current display member and the open phase display member to the outside are respectively provided on the front surface of the case in a direction substantially orthogonal to the parallel direction of the three poles. Since it opened in the same position, there exists an effect that the appearance seen from the case front becomes good.
[0049]
  Claim3The invention of claim1 or 2In this invention, the second stopper member can be prevented from returning by operating the second stopper member from outside the case. Therefore, the second stopper member can be operated to release the second plunger returning prevention. For example, since the tripping member can be returned to the position where the latch member is latched, the main contact can be closed by operating the handle.
[0050]
  Claim4The invention of claimAny one of 1 to 3In the invention, the first electromagnetic release device includes a first electromagnet that is excited when a leakage current is detected by the leakage detection means, and a latch member that is moved by the excited first electromagnet to latch the latch member. A first plunger that drives the tripping member to release the first plunger, and prevents the return of the first plunger that is driven in a state where the main contact is forcibly opened by the first electromagnetic release device. The first stopper member is provided so that the first plunger is engaged with the first plunger so as to be freely disengaged, and the first plunger is removed from the first plunger in a state where the return of the first plunger is blocked by the first stopper member. In a state in which the first engagement portion having the first engagement portion and the second plunger are detachably engaged with each other and the return of the second plunger is blocked by the second stopper member, the latch member is not latched. Trip Is provided with the second engagement portion of the thickness to hold the timber in tripping member, claim simply by changing the first and second thickness of the engaging portion provided on the tripping member1Since the same effect as that of the present invention can be obtained, the configurations of the first and second electromagnetic release devices can be made common, and the cost can be reduced by making the parts common.
[0051]
  Claim5The invention of claimAny one of 1 to 3In the invention, the first electromagnetic release device includes a first electromagnet that is excited when a leakage current is detected by the leakage detection means, and a latch member that is moved by the excited first electromagnet to latch the latch member. A first plunger that drives the tripping member to release the first plunger, and prevents the return of the first plunger that is driven in a state where the main contact is forcibly opened by the first electromagnetic release device. The first stopper member is provided, and the first and second engaging portions that are engaged with the first and second plungers so as to be freely engaged and disengaged are provided on the tripping member, and the first contact when the main contact is closed is provided. Since the interval between the second plunger and the second engagement portion when the main contact is closed is made narrower than the interval between the plunger and the first engagement portion, the first and second provided on the tripping member Since the engaging portion can have the same structure, First and second electromagnetic release device, as well as space for disposing the leakage display member and the open phase display member is not limited, there is an effect that two spaces are not adjacent can be freely selected.
[Brief description of the drawings]
FIG. 1 is a front view of the first embodiment with a cover removed.
FIG. 2 is a front view of the above.
FIG. 3 is an exploded perspective view in which a part of the opening / closing mechanism is omitted.
FIG. 4 is an exploded perspective view of the first and second electromagnetic release devices in the same as above.
FIG. 5 is a circuit diagram of a leakage protection circuit, an open phase protection circuit, and a test circuit in the same as above.
FIG. 6 is a side cross-sectional view of the above when the electrode is closed.
FIG. 7 is a side sectional view at the time of opening with the handle according to the embodiment.
FIG. 8 is a side cross-sectional view immediately before the forced opening as in the above.
FIG. 9 is a side cross-sectional view of the above when the electrode is closed.
FIG. 10 is a side cross-sectional view at the moment when the forcible opening is detected by detecting leakage.
FIG. 11 is a side cross-sectional view after the forcible opening due to the leakage detection same as above.
FIG. 12 is a side cross-sectional view of the above when the electrode is closed.
FIG. 13 is a side cross-sectional view at the moment when the forcible opening is detected by the phase loss detection.
FIG. 14 is a side cross-sectional view after the forcible opening by the phase loss detection same as above.
FIG. 15 is a side sectional view when the second electromagnetic release device is reset.
FIG. 16 is a side cross-sectional view at the time of closing according to the second embodiment.
FIG. 17 is a side cross-sectional view at the moment when the forcible opening is detected by detecting the electric leakage.
FIG. 18 is a side cross-sectional view after the forcible opening due to the leakage detection described above.
FIG. 19 is a side cross-sectional view of the above when the electrode is closed.
FIG. 20 is a side cross-sectional view at the moment when the forcible opening is detected by the phase loss detection same as above.
FIG. 21 is a side cross-sectional view after the forced opening by the phase loss detection same as above.
[Explanation of symbols]
1 case
2 Handle
5 Opening / closing mechanism
9A First electromagnetic release device
9B Second electromagnetic release device
28 Bulkhead
100 Earth leakage display member
110 Phase loss display member

Claims (5)

隔壁により区分けされた３つのスペースにそれぞれ主回路の各極を収納するケースと、少なくとも一部がケース前面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各極の主接点を開閉する開閉機構と、主回路に流れる漏電電流を検出する漏電検出手段と、漏電検出手段にて漏電電流が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第１の電磁釈放装置と、中性線の欠相を検出する欠相検出手段と、欠相検出手段にて欠相が検出されると開閉機構を釈放して各極の主接点を強制的に開極する第２の電磁釈放装置と、第１の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する漏電表示部材と、第２の電磁釈放装置が開閉機構を釈放して主接点を開極した状態を表示する欠相表示部材とを備え、３つのスペースのうちで隣り合わない２つのスペースの一方に第１の電磁釈放装置並びに漏電表示部材を配設するとともに他方に第２の電磁釈放装置並びに欠相表示部材を配設し、これら２つのスペースに挟まれた残り１つのスペースにハンドルを配設し、開閉機構は、主接点の開閉と連動するラッチ部材と、主接点を閉極した状態でラッチ部材をラッチする引外し部材とを具備し、第２の電磁釈放装置は、欠相検出手段にて欠相が検出されたときに励磁される第２の電磁石と、励磁された第２の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第２のプランジャとを具備し、第２の電磁釈放装置により主接点が強制開極された状態において駆動された第２のプランジャの復帰を阻止する第２のストッパ部材を設け、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態では第２のプランジャにてラッチ部材をラッチしない位置に引外し部材を保持してなることを特徴とする欠相保護付漏電遮断器。A case that accommodates each pole of the main circuit in three spaces separated by a partition, a handle that is at least partially exposed from the front of the case, and at least a main contact of each pole according to the operation of the handle An open / close mechanism that opens and closes, a leakage detection means that detects a leakage current flowing in the main circuit, and a leakage contact current that is detected by the leakage detection means releases the opening and closing mechanism to forcibly open the main contact of each pole. The first electromagnetic release device, the phase loss detection means for detecting the phase loss of the neutral wire, and when the phase loss is detected by the phase loss detection means, the switching mechanism is released to force the main contact of each pole. A second electromagnetic release device that opens the contact, an earth leakage display member that displays a state in which the first electromagnetic release device releases the switching mechanism to open the main contact, and the second electromagnetic release device provides the switching mechanism. An open phase indicator that displays the state of the main contact that has been released. A first electromagnetic release device and an earth leakage display member are disposed in one of two spaces that are not adjacent to each other, and a second electromagnetic release device and an open phase display member are disposed on the other of the three spaces. The handle is arranged in the remaining space between these two spaces, and the open / close mechanism has a latch member that interlocks with the opening and closing of the main contact, and a trip that latches the latch member with the main contact closed. The second electromagnetic release device includes a second electromagnet that is excited when an open phase is detected by the open phase detecting means, and is moved and latched by the excited second electromagnet. And a second plunger that drives the tripping member to release the latch of the member, and the second plunger that is driven in a state where the main contact is forcibly opened by the second electromagnetic release device. The first to stop The stopper member is provided for, in a state in which return of the second plunger is blocked by the second stopper member and characterized by being obtained by holding the tripping member in a position not latching the latching member at a second plunger Earth leakage breaker with phase loss protection. 漏電表示部材並びに欠相表示部材をそれぞれ外部に露呈する２つの表示窓を、３つの極の並列方向と略直交する方向においてケース前面の略同一の位置に開口したことを特徴とする請求項１記載の欠相保護付漏電遮断器。  2. The two display windows that expose the leakage current display member and the phase loss display member to the outside, respectively, are opened at substantially the same position on the front surface of the case in a direction substantially perpendicular to the parallel direction of the three poles. Earth leakage breaker with phase loss protection as described. ケース外から第２のストッパ部材を操作することにより第２のプランジャの復帰阻止を解除可能としたことを特徴とする請求項１又は２記載の欠相保護付漏電遮断器。 3. The leakage breaker with phase loss protection according to claim 1 or 2, wherein the second stopper member can be released from the outside of the case by operating the second stopper member . 第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１のプランジャと係止離脱自在に係合し、第１のプランジャの復帰が第１のストッパ部材で阻止されている状態では第１のプランジャから離脱するような厚みを有する第１の係合部と、第２のプランジャと係止離脱自在に係合し、第２のプランジャの復帰が第２のストッパ部材で阻止されている状態ではラッチ部材をラッチしない位置に引外し部材を保持するような厚みの第２の係合部とを引外し部材に設けたことを特徴とする請求項１乃至３のいずれか記載の欠相保護付漏電遮断器。 The first electromagnetic release device is moved by the excited first electromagnet when the leakage current is detected by the leakage detection means, and is released by the excited first electromagnet to release the latch of the latch member. A first plunger for driving the tripping member to prevent the return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device. The first plunger has a thickness such that the first plunger is disengaged from the first plunger in a state in which the first plunger is engaged with the first plunger so as to be freely disengaged and the return of the first plunger is blocked by the first stopper member. The engagement portion and the second plunger are engaged with the second plunger so as to be freely disengaged, and when the return of the second plunger is blocked by the second stopper member, the trip member is moved to a position where the latch member is not latched. Hold The second engagement portion and the phase loss with earth leakage breaker according to any one of claims 1 to 3, characterized in that provided on the tripping member having a thickness of a. 第１の電磁釈放装置は、漏電検出手段にて漏電電流が検出されたときに励磁される第１の電磁石と、励磁された第１の電磁石により移動させられてラッチ部材のラッチを解除するように引外し部材を駆動する第１のプランジャとを具備し、第１の電磁釈放装置により主接点が強制開極された状態において駆動された第１のプランジャの復帰を阻止する第１のストッパ部材を設け、第１及び第２のプランジャとそれぞれ係止離脱自在に係合する第１及び第２の係合部を引外し部材に設けるとともに、主接点の閉極時における第１のプランジャと第１の係合部の間隔に対して主接点の閉極時における第２のプランジャと第２の係合部の間隔を狭くしたことを特徴とする請求項１乃至３のいずれか記載の欠相保護付漏電遮断器。The first electromagnetic release device is moved by the excited first electromagnet when the leakage current is detected by the leakage detection means, and is released by the excited first electromagnet to release the latch of the latch member. A first plunger for driving the tripping member to prevent the return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device. And the first and second engaging portions that are detachably engaged with the first and second plungers, respectively, are provided on the tripping member, and the first plunger and the second plunger when the main contact is closed second plunger and open phase according to any one of claims 1 to 3, characterized in that the narrow spacing of the second engagement portion during closing of the main contact relative to the first interval of the engaging portion Earth leakage breaker with protection.
JP2001024702A 2001-01-31 2001-01-31 Earth leakage breaker with phase loss protection Expired - Fee Related JP3687543B2 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2013125637A (en) * 2011-12-14 2013-06-24 Panasonic Corp Circuit breaking device

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KR100475071B1 (en) * 2002-12-14 2005-03-10 엘지산전 주식회사 open phase display device for circuit breaker
JP2014072178A (en) * 2012-10-02 2014-04-21 Kawamura Electric Inc Leakage breaker with poor connection cut-off function
US9589755B1 (en) * 2016-04-27 2017-03-07 Sensata Technologies, Inc. Circuit breaker having a framed finger area
CN116779283B (en) * 2023-07-07 2024-02-13 昆山宝誉斯电源科技有限公司 Open-phase protection equipment of combined transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013125637A (en) * 2011-12-14 2013-06-24 Panasonic Corp Circuit breaking device

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