JP6158597B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP6158597B2
JP6158597B2 JP2013117118A JP2013117118A JP6158597B2 JP 6158597 B2 JP6158597 B2 JP 6158597B2 JP 2013117118 A JP2013117118 A JP 2013117118A JP 2013117118 A JP2013117118 A JP 2013117118A JP 6158597 B2 JP6158597 B2 JP 6158597B2
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case
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protective cover
insulating protective
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JP2014235906A (en
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小有里 石原
小有里 石原
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河村電器産業株式会社
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本発明は回路遮断器に関し、詳しくは遮断器ケースの絶縁性能の向上を図った回路遮断器に関する。   The present invention relates to a circuit breaker, and more particularly to a circuit breaker that improves the insulation performance of a breaker case.

回路遮断器のケースは絶縁性に優れた合成樹脂、特に遮断動作時に発生するアークに対して耐性のある合成樹脂が選択されて使用される。一般的には安価で絶縁性に優れているポリブチレンテレフタレート（ＰＢＴ）樹脂を使用して作製されるものが多い（例えば、特許文献１参照）。
一方で、回路遮断器は小型化される傾向にあり、特に分岐ブレーカは大幅な小型化が進んでいる。このように小型化を進める場合、ケースの耐アーク性の更なる向上が必要となり、ＰＢＴ樹脂より耐アーク性に優れたポリアミド（ＰＡ）系樹脂を使用したものがある（例えば、特許文献２参照）。 For the circuit breaker case, a synthetic resin excellent in insulation, particularly a synthetic resin resistant to an arc generated during a breaking operation is selected and used. In general, many are manufactured using a polybutylene terephthalate (PBT) resin that is inexpensive and excellent in insulation (see, for example, Patent Document 1).
On the other hand, circuit breakers tend to be miniaturized, and in particular, branch breakers are greatly miniaturized. Thus, when further miniaturization is required, it is necessary to further improve the arc resistance of the case, and there is one using a polyamide (PA) resin that has better arc resistance than PBT resin (for example, see Patent Document 2). ).

特開平６−６８７６８号公報JP-A-6-68768 特開２００４−５５１７２号公報JP 2004-55172 A

しかしながら、耐アーク性を向上させたＰＡ系樹脂は、コスト高であるばかりでなく柔軟性を有しており、湿度の影響を受けて湿度が高くなると吸湿膨張して寸法が変化する問題を有していた。   However, PA resins with improved arc resistance are not only costly, but also have flexibility. If the humidity increases due to the influence of humidity, the PA resin has a problem that the dimensions are changed due to hygroscopic expansion. Was.

そこで、本発明はこのような問題点に鑑み、ＰＡ系樹脂をケースの一部のみに使用して、コスト増を押さえつつ耐アーク性の向上を図り、遮断器の小型化に貢献できるケース構造を備えた回路遮断器を提供することを目的としている。   Therefore, in view of such problems, the present invention uses a PA-based resin for only a part of the case, and improves arc resistance while suppressing an increase in cost, thereby contributing to downsizing of the circuit breaker. It aims at providing the circuit breaker provided with.

上記課題を解決する為に、請求項１の発明は、ケースの背面に電源側端子、前面に負荷側端子が配置され、ケース上面に電路のオン／オフ操作を行う操作ハンドルを備え、ケース内に電路のオン／オフを実施する固定接点及び可動接点から成る接点部、電路に流れる異常電流を検知する異常電流検出部、前記異常電流検出部の検知動作を受けて前記接点部をオフ動作させる開閉機構部を備えた回路遮断器であって、前記ケースの前記接点部を収容する接点収容部は、前記接点部を囲むように前記ケースの内壁にポリアミド系樹脂から成る絶縁保護カバーが配設され、前記絶縁保護カバーは、前記ケースに係止する複数の係止片を有する一方、前記ケースの内壁には前記係止片を収容して保持する係止部が設けられ、前記係止片が前記係止部に係止して前記絶縁保護カバーが前記ケースに装着されると共に、前記絶縁保護カバーは、前記接点収容部のケース装着面に平行な特定方向に対して弾性を発揮可能とするための帯状の折り曲げ部を有すると共に、前記特定方向の両端部に前記係止片を有し、対を成す前記係止片を前記係止部へ係止することで、前記絶縁保護カバーが圧縮されて装着されるよう前記係止部が前記係止片間の距離に対して短い距離で配置されて成ることを特徴とする。
この構成によれば、最も耐アーク性を必要とする部位をポリアミド系樹脂で覆うことができ、回路遮断器ケース全体を安価な樹脂で作製してもケースの絶縁性の向上を図ることができる。よって、コスト増を招くこと無く回路遮断器の小型化に貢献できる。
また、絶縁保護カバーをケースに装着した段階で、絶縁保護カバーに特定方向の伸張力が発生するため、この応力で絶縁保護カバーを安定してケースに固定できる。また、折り曲げ部により弾性力をスムーズに発生できる。
請求項２の発明は、ケースの背面に電源側端子、前面に負荷側端子が配置され、ケース上面に電路のオン／オフ操作を行う操作ハンドルを備え、ケース内に電路のオン／オフを実施する固定接点及び可動接点から成る接点部、電路に流れる異常電流を検知する異常電流検出部、前記異常電流検出部の検知動作を受けて前記接点部をオフ動作させる開閉機構部を備えた回路遮断器であって、前記ケースの前記接点部を収容する接点収容部は、前記接点部を囲むように前記ケースの内壁にポリアミド系樹脂から成る絶縁保護カバーが配設され、前記絶縁保護カバーは、前記ケースに係止する複数の係止片を有する一方、前記ケースの内壁には前記係止片を収容して保持する係止部が設けられ、前記係止片が前記係止部に係止して前記絶縁保護カバーが前記ケースに装着されると共に、前記絶縁保護カバーは前記接点収容部のケース装着面を覆う側面部材を有し、前記側面部材が、前記ケースに密着する裏部材と、前記接点部に対峙する表部材とを具備して二重に形成され、前記係止片は、前記裏部材の対向する両側部に形成されると共に、前記裏部材と前記表部材との間に空間を有するよう前記表部材に膨らみ部が設けられ、更に前記表部材には、前記接点部において発生するアークを前記空間に侵入させるための開口部が形成され、前記空間を消弧空間として使用することを特徴とする。
この構成によれば、最も耐アーク性を必要とする部位をポリアミド系樹脂で覆うことができ、回路遮断器ケース全体を安価な樹脂で作製してもケースの絶縁性の向上を図ることができる。よって、コスト増を招くこと無く回路遮断器の小型化に貢献できる。
また、側面部材が二重に形成されて両者の間の空間を消弧空間として使用するため、接点部で発生するアークを効果的に消弧できる。 In order to solve the above-mentioned problem, the invention of claim 1 is provided with a power-side terminal on the back of the case and a load-side terminal on the front, and an operation handle for turning on / off the electric circuit on the top of the case. A contact part composed of a fixed contact and a movable contact for turning on / off the electric circuit, an abnormal current detecting part for detecting an abnormal current flowing in the electric circuit, and a detection operation of the abnormal current detecting part to turn off the contact part. A circuit breaker having an opening / closing mechanism, wherein the contact accommodating portion that accommodates the contact portion of the case is provided with an insulating protective cover made of polyamide resin on the inner wall of the case so as to surround the contact portion The insulating protective cover includes a plurality of locking pieces that are locked to the case, and an inner wall of the case is provided with a locking portion that receives and holds the locking pieces. In the locking part Together with the insulating protective cover sealed is mounted on the case, the insulating protective cover, the bent portions of the strip to allow exert resilient against parallel specific direction in case mounting surface of said contact housing part And having the locking pieces at both ends in the specific direction, and locking the pair of locking pieces to the locking portion so that the insulating protective cover is compressed and mounted. The locking portion is arranged at a short distance with respect to the distance between the locking pieces .
According to this configuration, it is possible to cover the most arc-resistant part with the polyamide-based resin, and it is possible to improve the insulation of the case even if the entire circuit breaker case is made of an inexpensive resin. . Therefore, it is possible to contribute to the miniaturization of the circuit breaker without increasing the cost.
Further, when the insulating protective cover is attached to the case, an extension force in a specific direction is generated in the insulating protective cover, so that the insulating protective cover can be stably fixed to the case with this stress. Also, the elastic force can be smoothly generated by the bent portion.
The power supply side terminal is arranged on the back surface of the case, the load side terminal is arranged on the front surface, the operation handle for turning on / off the electric circuit is provided on the upper surface of the case, and the electric circuit is turned on / off in the case. Circuit breaker provided with a contact part composed of a fixed contact and a movable contact, an abnormal current detection part for detecting an abnormal current flowing in the electric circuit, and an opening / closing mechanism part for turning off the contact part in response to the detection operation of the abnormal current detection part The contact accommodating portion that accommodates the contact portion of the case is provided with an insulating protective cover made of a polyamide-based resin on the inner wall of the case so as to surround the contact portion. While having a plurality of locking pieces for locking to the case, a locking portion for receiving and holding the locking pieces is provided on the inner wall of the case, and the locking pieces are locked to the locking portion. The insulation protection cover Is attached to the case, and the insulating protective cover includes a side member that covers a case mounting surface of the contact accommodating portion, and the side member faces a back member that is in close contact with the case and the contact portion. A front member is formed in a double, and the locking pieces are formed on opposite side portions of the back member, and a space is provided between the back member and the front member. The member is provided with a bulge, and the front member is formed with an opening for allowing an arc generated in the contact portion to enter the space, and the space is used as an arc extinguishing space. .
According to this configuration, it is possible to cover the most arc-resistant part with the polyamide-based resin, and it is possible to improve the insulation of the case even if the entire circuit breaker case is made of an inexpensive resin. . Therefore, it is possible to contribute to the miniaturization of the circuit breaker without increasing the cost.
Further, since the side members are formed in a double manner and the space between the two is used as the arc extinguishing space, it is possible to effectively extinguish the arc generated at the contact portion.

請求項３の発明は、請求項１又は２に記載の構成において、前記ケースが、前記接点収容部を分割するよう左右に少なくとも２分割して形成される一方、前記絶縁保護カバーは左右に２分割して形成され、分割した絶縁保護カバー毎に前記係止片を備えて個々に前記ケースに装着可能としたことを特徴とする。
この構成によれば、絶縁保護カバーが分割形成されても、分割された絶縁保護カバーは個々に係止片を備えているため、個々にケースに装着することができる。 According to a third aspect of the present invention, in the configuration according to the first or second aspect, the case is formed by dividing it into at least two left and right so as to divide the contact accommodating portion, while the insulating protective cover has two left and right Each of the divided insulating protective covers is provided with the locking piece so that it can be individually attached to the case.
According to this configuration, even if the insulating protective cover is divided, the divided insulating protective covers are individually provided with the locking pieces, so that they can be individually attached to the case.

請求項４の発明は、請求項３に記載の構成において、分割した前記絶縁保護カバーは、前記ケースを一体化した際に互いに対向して当接する対向片を具備し、前記対向片同士の当接により前記絶縁保護カバーは前記ケースに密着することを特徴とする。
この構成によれば、カシメや溶着する工程を設けること無く絶縁保護カバーを簡易な操作でケースに安定して固定できる。 According to a fourth aspect of the present invention, in the configuration according to the third aspect , the divided insulating protective cover includes opposed pieces that are opposed to each other when the case is integrated. The insulating protective cover is in close contact with the case by contact.
According to this configuration, the insulating protective cover can be stably fixed to the case by a simple operation without providing a caulking or welding step.

請求項５の発明は、請求項１乃至４の何れかに記載の構成において、前記係止部は、前記係止片より小さく形成され、前記ポリアミド系樹脂が具備する柔軟性により、前記係止片が収縮して前記係止部に係止されることを特徴とする。
この構成によれば、係止片が単純な形状でも係止部に確実に係止させることができる。 According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the locking portion is formed smaller than the locking piece, and the locking is provided by the flexibility of the polyamide-based resin. The piece is contracted and locked to the locking portion.
According to this configuration, even if the locking piece has a simple shape, it can be reliably locked to the locking portion.

本発明によれば、最も耐アーク性を必要とする部位をポリアミド系樹脂で覆うことができ、回路遮断器ケース全体を安価な樹脂で作製してもケースの絶縁性の向上を図ることができる。よって、コスト増を招くこと無く回路遮断器の小型化に貢献できる。   According to the present invention, a portion requiring the most arc resistance can be covered with a polyamide-based resin, and the insulation of the case can be improved even when the entire circuit breaker case is made of an inexpensive resin. . Therefore, it is possible to contribute to the miniaturization of the circuit breaker without increasing the cost.

本発明に係る回路遮断器の一例を示し、ケースの一部を外して内部を露出させた斜視図である。It is the perspective view which showed an example of the circuit breaker which concerns on this invention, removed a part of case and exposed the inside. 図１の露出面方向から見た回路遮断器の側面図である。It is the side view of the circuit breaker seen from the exposed surface direction of FIG. 絶縁保護カバー単体を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。The insulation protection cover single-piece | unit is shown, (a) is a perspective view, (b) is a side view, (c) is a bottom view. 絶縁保護カバーの装着説明図である。It is mounting explanatory drawing of an insulation protective cover. 絶縁保護カバーの他の形状を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。The other shape of an insulation protective cover is shown, (a) is a perspective view, (b) is a side view, (c) is a bottom view. 絶縁保護カバーの他の形状を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。The other shape of an insulation protective cover is shown, (a) is a perspective view, (b) is a side view, (c) is a bottom view. 絶縁保護カバーの他の形状を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。The other shape of an insulation protective cover is shown, (a) is a perspective view, (b) is a side view, (c) is a bottom view.

本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図１は本発明に係る回路遮断器の一例を示し、ケースの一部を外して内部を露出させた斜視図を示している。図１において、１はケース１０の一方の端面に配置された電源側端子、２はケース１０の他方の端面に配置された負荷側端子、３はケース１０の上面に配置されて回路遮断器のオン／オフ操作を行う操作ハンドルである。そして、ケース１０内には、電源側端子１と負荷側端子２との間の電路上に配置されて電路の接続／遮断（オン／オフ）を行う接点部５、電路に流れる異常電流を検知する異常電流検出部６、この異常電流検出部６の検知動作を受けて接点部５を遮断動作させる開閉機構部７が配置され、接点部５が配置された接点収容部８には絶縁保護カバー９が組み付けられている。
尚、説明の都合上、負荷側端子２を配置した端面を前面、電源側端子１を配置した端面を背面として説明する。 Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a circuit breaker according to the present invention, and shows a perspective view in which a part of a case is removed and the inside is exposed. In FIG. 1, 1 is a power supply side terminal disposed on one end surface of the case 10, 2 is a load side terminal disposed on the other end surface of the case 10, and 3 is disposed on the upper surface of the case 10 to provide a circuit breaker. An operation handle for performing an on / off operation. And in the case 10, the contact part 5 which is arrange | positioned on the electrical circuit between the power supply side terminal 1 and the load side terminal 2, and connects / cuts off (ON / OFF) of an electrical circuit, The abnormal current which flows into an electrical circuit is detected An abnormal current detection unit 6 that performs the detection operation of the abnormal current detection unit 6 and an opening / closing mechanism unit 7 that cuts off the contact unit 5 are disposed. An insulating protective cover is provided in the contact accommodating unit 8 in which the contact unit 5 is disposed. 9 is assembled.
For convenience of explanation, the end surface on which the load side terminal 2 is arranged will be described as the front surface, and the end surface on which the power source side terminal 1 is disposed will be described as the back surface.

ケース１０はＰＢＴ樹脂で形成され、右側面を有する第１ケース部材１０ａと、中央部を形成する第２ケース部材１０ｂと、左側面を有する第３ケース部材（図示せず）との３部材に分割形成され、接点収容部８は操作ハンドル３の後方に隣接するケース１０の上部に配置されている。
図２は、図１の露出面方向である左側から見た回路遮断器の側面図を示し、絶縁保護カバー９の一部を取り除いて接点部５を露出させている。この図２に示すように、接点部５は電源側端子１に連結された固定接点５ａと、負荷側端子２に連結された可動接点５ｂとで構成されている。具体的に、固定接点５ａは電源側端子１の端子金具の端部に起立形成された固定接触子１２の先端に設けられ、可動接点５ｂは固定接触子１２に平行に起立配置された可動接触子１３の先端に固定接点５ａに対峙するように設けられている。
また、異常電流検出部６は、短絡電流を検知する電磁装置６ａと、過電流を検知するためのバイメタル片６ｂとで構成されている。 The case 10 is made of PBT resin, and includes three members: a first case member 10a having a right side surface, a second case member 10b forming a central portion, and a third case member (not shown) having a left side surface. The contact accommodating portion 8 is divided and formed on the upper portion of the case 10 adjacent to the rear of the operation handle 3.
FIG. 2 is a side view of the circuit breaker as viewed from the left side, which is the exposed surface direction of FIG. 1, and a part of the insulating protective cover 9 is removed to expose the contact portion 5. As shown in FIG. 2, the contact portion 5 includes a fixed contact 5 a connected to the power supply side terminal 1 and a movable contact 5 b connected to the load side terminal 2. Specifically, the fixed contact 5 a is provided at the tip of the fixed contact 12 that is erected at the end of the terminal fitting of the power supply side terminal 1, and the movable contact 5 b is a movable contact that is erected in parallel with the fixed contact 12. The tip of the child 13 is provided so as to face the fixed contact 5a.
Moreover, the abnormal current detection part 6 is comprised by the electromagnetic device 6a which detects a short circuit current, and the bimetal piece 6b for detecting an overcurrent.

尚、図１及び図２において、電路を構成する可撓導線及び負荷側端子２から電磁装置６ａ及びバイメタル片６ｂに至る負荷座を省略している。   In FIG. 1 and FIG. 2, the flexible conductive wire constituting the electric circuit and the load seat from the load side terminal 2 to the electromagnetic device 6a and the bimetal piece 6b are omitted.

以下、絶縁保護カバー９について具体的に説明する。絶縁保護カバー９は、接点部５が遮断動作（オフ動作）時に発生するアーク放電からケース１０を守るために、接点部５を囲むように、特にアーク放電の主な飛散方向である左右壁面を保護するように配置されている。
図３は絶縁保護カバー９単体を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図を示している。但し、絶縁保護カバー９は、右側に配置される右カバー９ａと左側に配置される左カバー９ｂの２部材で構成され、（ａ）は絶縁保護カバー９の全体を示し、（ｂ），（ｃ）は右カバー９ａのみを示している。
絶縁保護カバー９はＰＡ系樹脂で形成され、右カバー９ａと左カバー９ｂとは対称形状となっている。右カバー９ａは第１ケース部材１０ａの接点収容部８に取り付けられ、左カバー９ｂは第３ケース部材に取り付けられる。尚、右カバー９ａと左カバー９ｂとは対称形状であるため、以下右カバー９ａについて説明し、左カバー９ｂの説明を省略する。 Hereinafter, the insulating protective cover 9 will be specifically described. Insulation protection cover 9 is provided to protect the case 10 from arc discharge that occurs when the contact portion 5 is cut off (off operation), particularly on the left and right wall surfaces that are the main scattering direction of arc discharge so as to surround the contact portion 5. Arranged to protect.
3 shows the insulating protective cover 9 alone, (a) is a perspective view, (b) is a side view, and (c) is a bottom view. However, the insulating protective cover 9 is composed of two members, a right cover 9a arranged on the right side and a left cover 9b arranged on the left side, (a) showing the whole insulating protective cover 9, (b), ( c) shows only the right cover 9a.
The insulating protective cover 9 is made of PA resin, and the right cover 9a and the left cover 9b are symmetrical. The right cover 9a is attached to the contact accommodating portion 8 of the first case member 10a, and the left cover 9b is attached to the third case member. Since the right cover 9a and the left cover 9b are symmetrical, the right cover 9a will be described below, and the description of the left cover 9b will be omitted.

右カバー９ａは、第１ケース部材１０ａの内面である接点収容部８の側部を覆う平坦な側面部材９１を有し、その左右（ケース１０の前後方向）にはケース１０に係止させるための台形形状の係止片９２，９２が突設されている。また、側面部材９１の上端には、対向配置される左カバー９ｂに当接する対向片９３が側方に向けて設けられ、図３（ａ）に示すように全体はＬ字状に形成されている。
れている。 The right cover 9a has a flat side surface member 91 that covers the side portion of the contact accommodating portion 8 that is the inner surface of the first case member 10a, and is engaged with the case 10 on the left and right sides (front and rear direction of the case 10). The trapezoidal locking pieces 92 and 92 are projected. Further, an opposing piece 93 that abuts the opposing left cover 9b is provided laterally at the upper end of the side member 91, and is formed in an L shape as a whole as shown in FIG. Yes.
It is.

図４はケース１０と絶縁保護カバー９の関係を示す説明図であり、（ａ）は右カバー９ａを第１ケース部材１ａに固定した状態を示し、（ｂ）はＭ１部を拡大した図であり係止片９２の係止説明図である。
ケース１０には絶縁保護カバー９を収容する凹部１５が絶縁保護カバー９の形状に合わせて形成されている。ただし、図４（ｂ）に示すように凹部１５のうち、係止片９２を収容する係止部１５ａは、係止片９２が収縮して収容されるよう係止片９２の大きさに対して僅かに小さく形成されている。この結果、係止片９２が収縮した状態で収容され、係止部１５ａに確実に保持される。尚、Ｔ１，Ｔ２は凹部１５の幅を示し、絶縁保護カバー９の側面部材９１の幅より僅かに大きい寸法となっている。 4A and 4B are explanatory views showing the relationship between the case 10 and the insulating protective cover 9, wherein FIG. 4A shows a state in which the right cover 9a is fixed to the first case member 1a, and FIG. 4B is an enlarged view of the M1 portion. FIG. 10 is an explanatory diagram of the locking piece 92.
The case 10 is formed with a recess 15 that accommodates the insulating protective cover 9 according to the shape of the insulating protective cover 9. However, as shown in FIG. 4 (b), the locking portion 15a for receiving the locking piece 92 in the recess 15 is smaller than the size of the locking piece 92 so that the locking piece 92 is retracted and received. Slightly smaller. As a result, the locking piece 92 is accommodated in a contracted state and is securely held by the locking portion 15a. T1 and T2 indicate the width of the recess 15 and are slightly larger than the width of the side member 91 of the insulating protective cover 9.

そして、３部材から成るケース１０を一体化することで、同様に第３ケース部材に組み付けられた左カバー９ｂと、対向片９３同士が当接することで、互いにケース１０に密着する応力が発生し、絶縁保護カバー９の抜けが防止される。   Then, by integrating the case 10 made of three members, the left cover 9b similarly assembled to the third case member and the opposing pieces 93 come into contact with each other, so that stress is brought into close contact with the case 10 with each other. The insulation protective cover 9 is prevented from coming off.

このように、最も耐アーク性を必要とする部位がＰＡ系樹脂で作製された絶縁保護カバー９で覆われるため、回路遮断器ケース１０の全体を安価なＰＢＴ樹脂で作製してもケース１０の絶縁性の向上を図ることができる。よって、コスト増を招くこと無く回路遮断器の小型化に貢献できる。
また、ケース１０が分割形成されて、絶縁保護カバー９もそれに合わせて分割されても、分割された絶縁保護カバー９は個々に係止片９２を備えているため、個々にケース１０に保持させることができ、スムーズな組み立てを行うことができる。また、分離形成することで、接点部５を容易に覆うよう配置できる。
更に、対向片９３を設けることで、分割形成された絶縁保護カバー９は互いに押圧してケース１０に密着させるため、カシメや溶着する工程を設けること無く絶縁保護カバー９を簡易な操作でケース１０に固定できる。 As described above, since the portion requiring the most arc resistance is covered with the insulating protective cover 9 made of PA resin, even if the circuit breaker case 10 is entirely made of inexpensive PBT resin, The insulation can be improved. Therefore, it is possible to contribute to the miniaturization of the circuit breaker without increasing the cost.
Further, even if the case 10 is divided and the insulation protection cover 9 is also divided accordingly, the divided insulation protection cover 9 is individually provided with the locking pieces 92, so that the case 10 is held individually. Can be assembled smoothly. Moreover, it can arrange | position so that the contact part 5 may be covered easily by forming separately.
Further, since the insulating protection cover 9 formed in a divided manner is pressed against each other by being provided with the facing piece 93, the insulating protection cover 9 can be easily operated without being caulked or welded. Can be fixed.

図５は絶縁保護カバー９の他の形状を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。上記絶縁保護カバー９と同様に、ＰＡ系樹脂により対称形状の２部材で構成されている。具体的に、右側に配置される右カバー９ｃと左側に配置される左カバー９ｄの２部材で構成され、（ａ）は絶縁保護カバー９の全体を示し、（ｂ），（ｃ）は右カバー９ｃを示している。
上記図３の形状とは、側面部材９１の略中央部に折り曲げ部９４を形成している点が相違している。折り曲げ部９４は、側面部材９１を左右から撓ませて接点部５に向けて突起を形成し、左右に形成された係止片９２，９２に対して直交する縦方向に延設されている。また、折り曲げ部９４の上下端部は、収縮操作をスムーズに実施できるよう切り欠き９４ａが形成されている。この結果、側面部材９１が左右方向に伸縮可能となり、この伸縮性を利用してケース１０の凹部に収容される。 FIG. 5 shows another shape of the insulating protective cover 9, (a) is a perspective view, (b) is a side view, and (c) is a bottom view. Similar to the insulating protective cover 9, it is composed of two symmetrical members made of PA resin. Specifically, it is composed of two members, a right cover 9c disposed on the right side and a left cover 9d disposed on the left side. (A) shows the entire insulating protective cover 9, and (b) and (c) are on the right. The cover 9c is shown.
3 is different from the shape of FIG. 3 in that a bent portion 94 is formed at a substantially central portion of the side member 91. The bent portion 94 bends the side member 91 from the left and right to form a protrusion toward the contact portion 5, and extends in the vertical direction perpendicular to the locking pieces 92 and 92 formed on the left and right. Further, notches 94a are formed at the upper and lower end portions of the bent portion 94 so that the contraction operation can be performed smoothly. As a result, the side member 91 can be expanded and contracted in the left-right direction, and is accommodated in the concave portion of the case 10 using this elasticity.

そして、側面部材９１の幅Ｔ３，Ｔ４が凹部（図４に示す）１５の幅Ｔ１，Ｔ２に対して僅かに大きくなるよう形成されている。尚、側面部材９１の４角に設けられた突起Ｑは、凹部（図４に示す）１５との係合をスムーズに行うためのものである。   The side members 91 are formed such that the widths T3 and T4 are slightly larger than the widths T1 and T2 of the recesses 15 (shown in FIG. 4). The protrusions Q provided at the four corners of the side member 91 are for smoothly engaging with the recesses 15 (shown in FIG. 4).

絶縁保護カバー９をこのような形状とすることで、側面部材９１が収縮した状態で凹部１５に収容されるため、折り曲げ部９４に伸張しようとする弾性が発生し、係止部１５ａに係止片９３を係止する簡易な構成でも、絶縁保護カバー９を安定してケース１０に固定できる。また、折り曲げ部９４により弾性力をスムーズに発生できる。
尚、折り曲げ部９４は複数設けても良く、図６は右カバー９ｅ及び左カバー９ｆの双方に折り曲げ部９４をそれぞれ２本形成した絶縁保護カバー９を示している。 By forming the insulating protective cover 9 in such a shape, the side member 91 is accommodated in the recessed portion 15 in a contracted state, so that elasticity that tends to extend to the bent portion 94 is generated and locked to the locking portion 15a. Even with a simple configuration for locking the piece 93, the insulating protective cover 9 can be stably fixed to the case 10. Further, the bending portion 94 can generate an elastic force smoothly.
A plurality of the bent portions 94 may be provided. FIG. 6 shows the insulating protective cover 9 in which two bent portions 94 are formed on both the right cover 9e and the left cover 9f.

図７は絶縁保護カバー９の更に他の形状を示し、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は底面図である。上記図３に示す絶縁保護カバー９と同様に、ＰＡ系樹脂により対称形状の２部材で構成されている。具体的に、右側に配置される右カバー９ｇと左側に配置される左カバー９ｈの２部材で構成され、（ａ）は絶縁保護カバー９の全体を示し、（ｂ），（ｃ）は右カバー９ｇを示している。   FIG. 7 shows still another shape of the insulating protective cover 9, wherein (a) is a perspective view, (b) is a side view, and (c) is a bottom view. Similar to the insulating protective cover 9 shown in FIG. 3, it is composed of two symmetrical members made of PA resin. Specifically, it is composed of two members, a right cover 9g arranged on the right side and a left cover 9h arranged on the left side, (a) showing the entire insulating protective cover 9, and (b), (c) being the right The cover 9g is shown.

上記図３の形状とは、側面部材９１がケース１０に密着させる裏部材９１ａと接点部５に対峙する表部材９１ｂとの二重に形成されている点が大きく相違している。そして、裏部材９１ａは平坦に形成されて左右端部に係止片９２が設けられ、表部材９１ｂは上記図６の側面部材９１のように折り曲げ部９４が２本形成されている。
また、表部材９１ｂの略中央には長穴９５が開口形成されて、折り曲げ部９４を形成することで裏部材９１ａとの間に形成された内部空間９６にアークが侵入できるよう形成されている。 3 is largely different from the shape of FIG. 3 in that the side member 91 is formed in duplicate with a back member 91 a that is in close contact with the case 10 and a front member 91 b that faces the contact portion 5. And the back member 91a is formed flat, the latching piece 92 is provided in the right-and-left end part, and the bending part 94 is formed in the front member 91b like the side member 91 of the said FIG.
In addition, an elongated hole 95 is formed in the approximate center of the front member 91b so that an arc can enter the internal space 96 formed between the back member 91a by forming a bent portion 94. .

このように、側面部材９１を二重に形成し、両者の間の空間を消弧空間として使用するため、接点部５で発生するアークを効果的に消弧でき、ケース１０に対するアークの作用を更に弱めることができる。   Thus, since the side member 91 is formed in a double manner and the space between the two is used as the arc extinguishing space, the arc generated at the contact portion 5 can be effectively extinguished, and the action of the arc on the case 10 can be reduced. It can be further weakened.

尚、この消弧空間を形成した絶縁保護カバー９の場合、表部材９１ｂに形成される突起は折り曲げ部９４でなくとも良く、裏部材９１ｂとの間に空間が発生するよう膨らみ部を設ければよい。
また、ＰＡ系樹脂とは、ポリアミド樹脂を主成分とする樹脂を言い、ポリアミド樹脂はアミド結合を持つ高分子化合物である。ポリアミド樹脂としては、例えばナイロン６、ナイロン６６、ナイロン４６等がある。
更に、係止片９２を台形形状で形成しているが四角形であれば良好に係止させることが可能である。また側面部材９１の左右に一対設けているが、更に多く設けても良い。
また、ケース１０を３部材で構成しているが、分割数は任意であり２部材で構成しても良い。 In the case of the insulating protective cover 9 in which the arc extinguishing space is formed, the protrusion formed on the front member 91b may not be the bent portion 94, and a bulging portion may be provided so as to generate a space between the back member 91b. That's fine.
The PA resin is a resin mainly composed of a polyamide resin, and the polyamide resin is a polymer compound having an amide bond. Examples of the polyamide resin include nylon 6, nylon 66, nylon 46, and the like.
Furthermore, although the locking piece 92 is formed in a trapezoidal shape, it can be satisfactorily locked if it is square. A pair of side members 91 are provided on the left and right sides, but more may be provided.
Moreover, although the case 10 is comprised by 3 members, the division | segmentation number is arbitrary and may be comprised by 2 members.

１・・電源側端子、２・・負荷側端子、３・・操作ハンドル、５・・接点部、６・・異常電流検出部、７・・開閉機構部、８・・接点収容部、９・・絶縁保護カバー、１０・・ケース、１５ａ・・係止部、９１・・側面部材、９１ａ・・裏部材、９１ｂ・・表部材、９２・・係止片、９３・・対向片、９４・・折り曲げ部、９５・・長穴（開口部）、９６・・内部空間（消弧空間）。   1 .... Power supply side terminal 2 .... Load side terminal 3 .... Operation handle 5 .... Contact part 6 .... Abnormal current detection part 7 .... Opening / closing mechanism part 8 .... Contact accommodating part 9 ... · Insulation protective cover, 10 · · Case, 15a · · Locking portion, 91 · · Side member, 91a · · Back member, 91b · · Front member, 92 · · Locking piece, 93 · · Opposing piece, 94 · ·・ Bending part, 95 ・ ・ Elongated hole (opening), 96 ・ ・ Internal space (arc extinguishing space).

Claims (5)

ケースの背面に電源側端子、前面に負荷側端子が配置され、ケース上面に電路のオン／オフ操作を行う操作ハンドルを備え、ケース内に電路のオン／オフを実施する固定接点及び可動接点から成る接点部、電路に流れる異常電流を検知する異常電流検出部、前記異常電流検出部の検知動作を受けて前記接点部をオフ動作させる開閉機構部を備えた回路遮断器であって、
前記ケースの前記接点部を収容する接点収容部は、前記接点部を囲むように前記ケースの内壁にポリアミド系樹脂から成る絶縁保護カバーが配設され、
前記絶縁保護カバーは、前記ケースに係止する複数の係止片を有する一方、前記ケースの内壁には前記係止片を収容して保持する係止部が設けられ、
前記係止片が前記係止部に係止して前記絶縁保護カバーが前記ケースに装着されると共に、
前記絶縁保護カバーは、前記接点収容部のケース装着面に平行な特定方向に対して弾性を発揮可能とするための帯状の折り曲げ部を有すると共に、前記特定方向の両端部に前記係止片を有し、
対を成す前記係止片を前記係止部へ係止することで、前記絶縁保護カバーが圧縮されて装着されるよう前記係止部が前記係止片間の距離に対して短い距離で配置されて成ることを特徴とする回路遮断器。 A power supply side terminal is arranged on the back of the case, a load side terminal is arranged on the front, an operation handle for turning on / off the electric circuit is provided on the upper surface of the case, and a fixed contact and a movable contact for turning on / off the electric circuit in the case A circuit breaker comprising a contact portion, an abnormal current detection portion for detecting an abnormal current flowing in an electric circuit, and an opening / closing mechanism portion for turning off the contact portion in response to a detection operation of the abnormal current detection portion,
The contact accommodating portion for accommodating the contact portion of the case is provided with an insulating protective cover made of polyamide resin on the inner wall of the case so as to surround the contact portion,
The insulating protective cover has a plurality of locking pieces that are locked to the case, while an inner wall of the case is provided with a locking portion that houses and holds the locking pieces,
The locking piece is locked to the locking portion and the insulating protective cover is attached to the case .
The insulating protective cover has a belt-like bent portion for enabling elasticity in a specific direction parallel to the case mounting surface of the contact accommodating portion, and the locking pieces are provided at both ends in the specific direction. Have
By locking the pair of locking pieces to the locking portion, the locking portion is arranged at a short distance relative to the distance between the locking pieces so that the insulating protective cover is compressed and mounted. The circuit breaker characterized by being made . ケースの背面に電源側端子、前面に負荷側端子が配置され、ケース上面に電路のオン／オフ操作を行う操作ハンドルを備え、ケース内に電路のオン／オフを実施する固定接点及び可動接点から成る接点部、電路に流れる異常電流を検知する異常電流検出部、前記異常電流検出部の検知動作を受けて前記接点部をオフ動作させる開閉機構部を備えた回路遮断器であって、
前記ケースの前記接点部を収容する接点収容部は、前記接点部を囲むように前記ケースの内壁にポリアミド系樹脂から成る絶縁保護カバーが配設され、
前記絶縁保護カバーは、前記ケースに係止する複数の係止片を有する一方、前記ケースの内壁には前記係止片を収容して保持する係止部が設けられ、
前記係止片が前記係止部に係止して前記絶縁保護カバーが前記ケースに装着されると共に、
前記絶縁保護カバーは前記接点収容部のケース装着面を覆う側面部材を有し、
前記側面部材が、前記ケースに密着する裏部材と、前記接点部に対峙する表部材とを具備して二重に形成され、
前記係止片は、前記裏部材の対向する両側部に形成されると共に、前記裏部材と前記表部材との間に空間を有するよう前記表部材に膨らみ部が設けられ、
更に前記表部材には、前記接点部において発生するアークを前記空間に侵入させるための開口部が形成され、前記空間を消弧空間として使用することを特徴とする回路遮断器。 A power supply side terminal is arranged on the back of the case, a load side terminal is arranged on the front, an operation handle for turning on / off the electric circuit is provided on the upper surface of the case, and a fixed contact and a movable contact for turning on / off the electric circuit in the case A circuit breaker comprising a contact portion, an abnormal current detection portion for detecting an abnormal current flowing in an electric circuit, and an opening / closing mechanism portion for turning off the contact portion in response to a detection operation of the abnormal current detection portion,
The contact accommodating portion for accommodating the contact portion of the case is provided with an insulating protective cover made of polyamide resin on the inner wall of the case so as to surround the contact portion,
The insulating protective cover has a plurality of locking pieces that are locked to the case, while an inner wall of the case is provided with a locking portion that houses and holds the locking pieces,
The locking piece is locked to the locking portion and the insulating protective cover is attached to the case.
The insulating protective cover has a side member that covers a case mounting surface of the contact housing part,
The side member is formed in duplicate with a back member closely contacting the case and a front member facing the contact portion,
The locking pieces are formed on opposite side portions of the back member, and a bulge portion is provided on the front member so as to have a space between the back member and the front member,
The circuit breaker according to claim 1 , wherein an opening for allowing an arc generated at the contact portion to enter the space is formed in the front member, and the space is used as an arc extinguishing space . 前記ケースが、前記接点収容部を分割するよう左右に少なくとも２分割して形成される一方、前記絶縁保護カバーは左右に２分割して形成され、
分割した絶縁保護カバー毎に前記係止片を備えて個々に前記ケースに装着可能としたことを特徴とする請求項１又は２記載の回路遮断器。 The case is formed to be divided into at least two left and right so as to divide the contact accommodating part, while the insulating protective cover is divided into two left and right,
3. The circuit breaker according to claim 1, wherein each of the divided insulating protective covers is provided with the locking piece and can be individually attached to the case. 分割した前記絶縁保護カバーは、前記ケースを一体化した際に互いに対向して当接する対向片を具備し、前記対向片同士の当接により前記絶縁保護カバーは前記ケースに密着することを特徴とする請求項３記載の回路遮断器。 The divided insulating protective cover includes opposing pieces that are opposed to each other when the case is integrated, and the insulating protective cover is in close contact with the case by the contact of the opposing pieces. The circuit breaker according to claim 3 . 前記係止部は前記係止片より小さく形成され、前記ポリアミド系樹脂が具備する柔軟性により、前記係止片が収縮して前記係止部に係止されることを特徴とする請求項１乃至４の何れかに記載の回路遮断器。 The locking portion is formed smaller than the locking piece, according to claim 1, wherein said polyamide resin is a flexibility that includes, wherein the locking member is locked to the locking portion to contract The circuit breaker in any one of thru | or 4 .
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