JP2011081988A - Circuit breaker - Google Patents
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- JP2011081988A JP2011081988A JP2009232396A JP2009232396A JP2011081988A JP 2011081988 A JP2011081988 A JP 2011081988A JP 2009232396 A JP2009232396 A JP 2009232396A JP 2009232396 A JP2009232396 A JP 2009232396A JP 2011081988 A JP2011081988 A JP 2011081988A
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Abstract
Description
本発明は、配線用遮断器、漏電遮断器などの回路遮断器に関し、特に、短絡電流を遮断する際に、接触子が両開きする反発形の回路遮断器に関する。 The present invention relates to a circuit breaker such as a circuit breaker for wiring, an earth leakage breaker, and the like, and more particularly, to a repulsive circuit breaker in which a contactor double-opens when a short-circuit current is interrupted.
この種の反発形の回路遮断器として、特許文献１に開示された回路遮断器が知られている。図４は、従来の反発形の３極回路遮断器の閉路状態を示す要部縦断面図である。
図において、１はケース１aとカバー１ｂからなる本体ケース、２は一端に端子が接続される端子部２aを有し、ケース１ａにねじ等により固定された電源側の端子導体、３は一端に第１の可動接点３aを有する第１可動接触子、４は各極の第１可動接触子３の他端を軸支保持するホルダであり、本体ケース１に回動自在に支持されている。
As this type of repulsive circuit breaker, a circuit breaker disclosed in Patent Document 1 is known. FIG. 4 is a longitudinal sectional view of an essential part showing a closed state of a conventional repulsive three-pole circuit breaker.
In the figure, 1 is a main body case comprising a case 1a and a cover 1b, 2 has a terminal portion 2a to which a terminal is connected at one end, a terminal conductor on the power supply side fixed to the case 1a with a screw or the like, and 3 at one end. A first movable contact 4 having a first movable contact 3a is a holder for pivotally supporting the other end of the first movable contact 3 of each pole, and is supported by the main body case 1 so as to be rotatable.
５は一端に第1の可動接点３ａと接触する第２の可動接点５aを有する第２可動接触子、６は端子導体２に電気的に接続されるとともに、前記第２可動接触子５の他端を支点ピン５ｂにより回動自在に支持する導電性の支持部材である。なお、支持部材のかわりにリード線を用いて端子導体２と第２可動接触子５を接続してもよい。 Reference numeral 5 denotes a second movable contact having a second movable contact 5a that contacts the first movable contact 3a at one end, and 6 is electrically connected to the terminal conductor 2 and other than the second movable contact 5 It is an electroconductive support member which supports an end rotatably by a fulcrum pin 5b. In addition, you may connect the terminal conductor 2 and the 2nd movable contact 5 using a lead wire instead of a supporting member.
７は第１および第２可動接触子３、５を囲むように配置された複数の磁性板を有する消弧室、８はトグルリンク機構とラッチ、ラッチ受け等からなり、前記ホルダ４と第１可動接触子３を開閉駆動する開閉機構、９は操作ハンドル、１０は第２可動接触子５を第１可動接触子３側に押圧する接触ばねである。なお、１１は端子導体２にねじ等を用いて取り付けた導電性を有する逆くの字状に折り曲げ形成されたアークホーンであり、端子導体２に電気的に接続されている。 Reference numeral 7 denotes an arc extinguishing chamber having a plurality of magnetic plates arranged so as to surround the first and second movable contacts 3, 5. Reference numeral 8 denotes a toggle link mechanism, a latch, a latch receiver, and the like. An opening / closing mechanism that opens and closes the movable contact 3, 9 is an operation handle, and 10 is a contact spring that presses the second movable contact 5 toward the first movable contact 3. Reference numeral 11 denotes an arc horn which is attached to the terminal conductor 2 using a screw or the like and is bent in a reverse letter shape having conductivity. The arc horn is electrically connected to the terminal conductor 2.
前記端子導体２、第１可動接触子３、第２可動接触子５、支持部材６、消弧室７、接触ばね１０は各極に配置されており、前記開閉機構８、操作ハンドル９は中央極に配置されている。 The terminal conductor 2, the first movable contact 3, the second movable contact 5, the support member 6, the arc extinguishing chamber 7, and the contact spring 10 are arranged on each pole, and the opening / closing mechanism 8 and the operation handle 9 are in the center. Located at the pole.
図において、電流は、電源側の端子導体２から支持部材６、第２可動接触子５、第１可動接触子３、図示しない過電流引外し装置を経て図示しない負荷側の端子導体まで流れる。 In the figure, a current flows from the terminal conductor 2 on the power source side to the support member 6, the second movable contact 5, the first movable contact 3, and the load-side terminal conductor (not shown) through the overcurrent tripping device (not shown).
かかる回路遮断器の開閉動作は周知の通りであり、操作ハンドル９を開閉操作すると開閉機構８を介してホルダ４及び第１可動接触子３が開閉駆動され、接点がオンオフする。
また、短絡電流などの大電流が流れると、第１可動接触子３と第２可動接触子５との間には互いに逆方向の電流が流れるため、図に矢印で示すような大きな電磁反発力が働き、両接触子は互いに離れる方向に開極する。ここで、第２可動接触子５は接触ばね１０に抗して図の反時計方向に回動され、第１可動接触子３から開離する。また、第１可動接触子３は図の時計方向に回動され、トリップした開閉機構８により、第１可動接触子３の開極位置で保持される。
The opening / closing operation of such a circuit breaker is well known, and when the operation handle 9 is opened / closed, the holder 4 and the first movable contact 3 are driven to open / close via the opening / closing mechanism 8, and the contact is turned on / off.
Further, when a large current such as a short-circuit current flows, currents in opposite directions flow between the first movable contact 3 and the second movable contact 5, so that a large electromagnetic repulsive force as indicated by an arrow in the figure. The two contacts are opened in a direction away from each other. Here, the second movable contact 5 is rotated counterclockwise in the figure against the contact spring 10 and separated from the first movable contact 3. The first movable contact 3 is rotated in the clockwise direction in the figure, and is held at the open position of the first movable contact 3 by the tripping opening / closing mechanism 8.
電流遮断時には、第１可動接触子３と第２可動接触子５の接点３ａ、５ａ間にアークが発生し、該アークは消弧室７側に引き伸ばされて、磁性板により分断され、陰極・陽極降下および冷却作用により消滅する。 When the current is interrupted, an arc is generated between the contacts 3a and 5a of the first movable contact 3 and the second movable contact 5, and the arc is stretched toward the arc extinguishing chamber 7 and divided by the magnetic plate. Disappears due to anode lowering and cooling action.
ところで、図４に示した従来例の反発形の回路遮断器には、次記のような問題がある。
すなわち、電流遮断により第１可動接触子３及び第２可動接触子５が開離した際には、両接点間にアークが発生するが、アークが接点上に滞留すると、接点がダメージを受ける。通常、電流遮断時に第１可動接触子３及び第２可動接触子５が開離した際には、第１可動接触子３は、開閉機構により開極した状態に保持されるが、第２可動接触子５は、開閉機構８により強制的に開極した状態を保つ構造が付加されていない。
Incidentally, the conventional repulsive circuit breaker shown in FIG. 4 has the following problems.
That is, when the first movable contact 3 and the second movable contact 5 are separated due to current interruption, an arc is generated between the two contacts, but if the arc stays on the contact, the contact is damaged. Normally, when the first movable contact 3 and the second movable contact 5 are separated when the current is interrupted, the first movable contact 3 is held in an open state by an opening / closing mechanism. The contact 5 is not added with a structure for maintaining a state in which the contact is forcibly opened by the opening / closing mechanism 8.
そのために、電流遮断後期において、一旦開極した第２可動接触子５は、電磁反発力の低下に伴って接触ばね１０により、再び、閉極位置へ戻されてしまうため、第２可動接触子５の接点５ａ上にアークが滞留しやすいという問題があった。 For this reason, the second movable contactor 5 once opened in the latter half of the current interruption is returned to the closed position by the contact spring 10 as the electromagnetic repulsion force decreases. There is a problem that the arc tends to stay on the contact 5a.
このため、第２可動接触子の接点は、第１可動接触子の接点よりもダメージが大きくなり、短絡電流遮断後に回路遮断器を投入した際に、接点間の接触抵抗が大きくなり、接点間での温度上昇が問題になる可能性があった。 For this reason, the contact of the second movable contact is more damaged than the contact of the first movable contact, and when the circuit breaker is turned on after the short-circuit current is interrupted, the contact resistance between the contacts increases, There was a possibility that the temperature rise at would be a problem.
また、上記の対策として、電源側の端子導体２にアークホーン１１を取り付けることにより、第１可動接触子３と第２可動接触子５が開離した際に、第２可動接触子５の接点側に発生したアークをアークホーン１１にバイパスさせて、アークが第２可動接触子５の接点上に滞留しないようにした構成が採用されている。 Further, as the above countermeasure, by attaching an arc horn 11 to the terminal conductor 2 on the power source side, when the first movable contact 3 and the second movable contact 5 are separated, the contact of the second movable contact 5 A configuration is adopted in which the arc generated on the side is bypassed to the arc horn 11 so that the arc does not stay on the contact of the second movable contact 5.
しかしながら、上記のように端子導体にアークホーンを取り付ける構成では、部品点数が増えるとともに、端子導体とアークホーンを電気的に確実に接続する必要があるため、コストがアップするという欠点があった。また、端子導体にアークホーンを取付けると、第２可動接触子がアークホーンを超えて開極した場合に、第２可動接触子の開極に伴って変わる第１可動接触子と第２可動接触子のギャップ長が、アークホーンの上面と第１可動接触子との距離で決定されてしまうため、遮断性能が犠牲になるという欠点があった。 However, in the configuration in which the arc horn is attached to the terminal conductor as described above, the number of parts is increased, and the terminal conductor and the arc horn need to be electrically and reliably connected. Further, when the arc horn is attached to the terminal conductor, the first movable contact and the second movable contact that change with opening of the second movable contact when the second movable contact opens beyond the arc horn. Since the gap length of the child is determined by the distance between the upper surface of the arc horn and the first movable contact, there is a drawback in that the interruption performance is sacrificed.
そこで、本発明の目的は、遮断性能を低下させることなく、アークによる第２可動接触子の接点の損耗を抑制できるようにした反発形の回路遮断器を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a repulsive circuit breaker capable of suppressing the wear of the contacts of the second movable contact due to an arc without reducing the breaking performance.
上記目的を達成するために、本発明によれば、第１の可動接点を有し、開閉機構により開閉駆動される第１可動接触子と、第２の可動接点を有し、接触ばねにより前記第１可動接触子に向かって付勢される回動自在な第２可動接触子と、前記第１および第２の可動接点間に発生したアークを消弧する消弧室とを備え、前記第２可動接触子は電流遮断時に電磁反発力を受けると第１可動接触子から前記接触ばねに抗して開極する回路遮断器において、前記第２可動接触子の先端に、第２の可動接点の接触面よりも突出する突起部を設けるようにする。 In order to achieve the above object, according to the present invention, a first movable contact having a first movable contact and driven to be opened and closed by an opening / closing mechanism and a second movable contact are provided, and the contact spring is used to A rotatable second movable contact that is biased toward the first movable contact; and an arc extinguishing chamber that extinguishes an arc generated between the first and second movable contacts; In the circuit breaker that opens the second movable contact against the contact spring when receiving an electromagnetic repulsive force when the current is interrupted, a second movable contact is formed at a tip of the second movable contact. Protrusions that protrude from the contact surface are provided.
上記回路遮断器において、前記第２可動接触子の先端に設けた突起部を第２可動接触子よりも融点の高い材料で形成するようにしてもよい。
また、上記回路遮断器において、前記第２可動接触子の先端に設けた突起部に、第２可動接触子よりも融点の高い材料からなるカバーを取り付けるようにしてもよい。
In the circuit breaker, the protrusion provided at the tip of the second movable contact may be formed of a material having a melting point higher than that of the second movable contact.
In the circuit breaker, a cover made of a material having a melting point higher than that of the second movable contact may be attached to the protrusion provided at the tip of the second movable contact.
本発明によれば、第２可動接触子の先端に、第２の可動接点の接触面よりも突出する突起部を設けたので、遮断性能を低下させることなく、アークによる第２可動接触子の接点の損耗を抑制することができる。 According to the present invention, the protrusion of the second movable contact that protrudes beyond the contact surface of the second movable contact is provided at the tip of the second movable contact, so that the second movable contact by the arc is not degraded without reducing the interruption performance. Contact wear can be suppressed.
以下、本発明の実施の形態を図示実施例に基づいて説明する。なお、実施例の図中で図４に対応する部材には同じ符号を付してその詳細な説明は省略する。
図１は、本発明の第１の実施形態を示す反発形の回路遮断器の閉路状態を示す要部縦断面図、図２は、反発形の回路遮断器の電流遮断時の状態を示す要部縦断面図である。
Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 4, and the detailed description is abbreviate | omitted.
FIG. 1 is a longitudinal sectional view of an essential part showing a closed state of a repulsive circuit breaker according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a state of the repulsive circuit breaker during current interruption. FIG.
本実施例において、従来例と異なる点は、第２可動接触子１５の先端に、第２の可動接点の接触面よりも突出する突起部を設けた点である。
図において、本体ケース１内には、先端に第１の可動接点３aを有する第１可動接触子３、先端に第２の可動接点１５aを有する第２可動接触子１５、電源側の端子導体２、複数の磁性板７ａを有する消弧室７が収容されている。前記第１可動接触子３及び第２可動接触子１５は例えば銅などの材料により形成されている。
なお、第１可動接触子３を保持するホルダ、開閉機構、第２可動接触子１５と端子導体２を電気的に接続する支持部材等は、従来例と同じであるため図示を省略している。
In this embodiment, the point different from the conventional example is that a protrusion protruding from the contact surface of the second movable contact is provided at the tip of the second movable contact 15.
In the figure, a main body case 1 includes a first movable contact 3 having a first movable contact 3a at the tip, a second movable contact 15 having a second movable contact 15a at the tip, and a terminal conductor 2 on the power source side. The arc extinguishing chamber 7 having a plurality of magnetic plates 7a is accommodated. The first movable contact 3 and the second movable contact 15 are made of a material such as copper.
The holder for holding the first movable contact 3, the opening / closing mechanism, the support member for electrically connecting the second movable contact 15 and the terminal conductor 2, and the like are the same as in the conventional example, and are not shown. .
また、９は、前記第１可動接触子３を図示しない開閉機構を介してオン、オフ操作する操作ハンドル、１０は第２可動接触子１５を第１可動接触子３側に押圧する接触ばね、１２は接触ばね１０の一端を固定する固定ピンである。 Further, 9 is an operation handle for turning on and off the first movable contact 3 via an opening / closing mechanism (not shown), 10 is a contact spring for pressing the second movable contact 15 toward the first movable contact 3, Reference numeral 12 denotes a fixing pin that fixes one end of the contact spring 10.
前記第１可動接触子３は、図示しないホルダに軸支保持されるピン３ｂを有し、該ピン３ｂを中心に回動自在に配置されている。前記第２可動接触子１５は、支点ピン１５ｂを中心に回動自在に配置されており、接触ばね１０により第１可動接触子３側に押圧されている。 The first movable contact 3 has a pin 3b that is pivotally supported by a holder (not shown), and is arranged to be rotatable about the pin 3b. The second movable contact 15 is disposed so as to be rotatable about a fulcrum pin 15 b and is pressed toward the first movable contact 3 by the contact spring 10.
そして、図1に示す回路遮断器の閉極状態では、第１の可動接点３ａの接触面と第２の可動接点１５ａの接触面が接触している。
ここで、前記第２可動接触子１５の先端側には突起部１５ｃが設けられている。この突起部１５ｃは、第２可動接触子１５の第２の可動接点１５ａよりも先端側に設けられており、かつ第２の可動接点１５ａの接触面よりも第１可動接触子３の先端側に突出して設けられている。
In the closed state of the circuit breaker shown in FIG. 1, the contact surface of the first movable contact 3a and the contact surface of the second movable contact 15a are in contact.
Here, a protrusion 15 c is provided on the distal end side of the second movable contact 15. The protrusion 15c is provided on the distal end side of the second movable contact 15 with respect to the second movable contact 15a, and the distal end side of the first movable contact 3 with respect to the contact surface of the second movable contact 15a. Is provided to protrude.
次に本発明の動作原理について説明する。
図１の回路遮断器の閉路状態において、回路遮断器に短絡電流などの大電流が流れると、第１可動接触子３と第２可動接触子１５の間には電磁反発力が働き、両接触子３、１５は互いに離れる方向に開離する。
このとき、第１の可動接点３ａと第２の可動接点１５ａとの間にはアーク１４が発生し、アーク１４は、第１可動接触子３と第２可動接触子１５からの電磁力により消弧室７側に駆動されるとともに、消弧室７の磁性板からの吸引力も作用して、アーク１４の経路は図２に示すように湾曲した形状になる。
ここで、第２の可動接点１５ａ側のアークの起点は、消弧室７の磁性板とのギャップ長が最も短くなる地点となるが、第２可動接触子１５の先端側に、第２の可動接点１５ａの接触面よりも突出する突起部１５ｃを設けたことにより、第２の可動接点１５ａ上に発生したアーク１４の発弧点は、第２の可動接点１５a上から突起部１５ｃに転流する。
Next, the operation principle of the present invention will be described.
In the closed state of the circuit breaker of FIG. 1, when a large current such as a short circuit current flows through the circuit breaker, an electromagnetic repulsive force acts between the first movable contact 3 and the second movable contact 15, and both contacts The children 3 and 15 are separated in a direction away from each other.
At this time, an arc 14 is generated between the first movable contact 3 a and the second movable contact 15 a, and the arc 14 is extinguished by electromagnetic force from the first movable contact 3 and the second movable contact 15. While being driven to the arc chamber 7 side, the attractive force from the magnetic plate of the arc extinguishing chamber 7 also acts, and the path of the arc 14 has a curved shape as shown in FIG.
Here, the starting point of the arc on the second movable contact 15a side is a point where the gap length with the magnetic plate of the arc extinguishing chamber 7 becomes the shortest. By providing the protrusion 15c that protrudes from the contact surface of the movable contact 15a, the arc 14 generated on the second movable contact 15a is transferred from the second movable contact 15a to the protrusion 15c. Shed.
これにより、第２の可動接点１５ａ上にアークが滞留することがなくなり、第２可動接触子１５側の可動接点１５ａの損耗を防止することができる。
また、第１の可動接点３ａ上に発生したアーク１４の発弧点も、第1可動接触子３の先端側に移動し、前記突起部１５ｃと第１可動接触子３の先端側との間に発生したアーク１４は、消弧室７の磁性板７ａにより分断され、陰極・陽極降下および冷却作用により消滅する。
Thereby, the arc does not stay on the second movable contact 15a, and wear of the movable contact 15a on the second movable contact 15 side can be prevented.
In addition, the starting point of the arc 14 generated on the first movable contact 3a also moves to the distal end side of the first movable contact 3, and between the protrusion 15c and the distal end side of the first movable contact 3. The arc 14 generated in the arc is divided by the magnetic plate 7a of the arc extinguishing chamber 7 and disappears by the cathode / anode drop and the cooling action.
このように、本実施例によれば、第２可動接触子１５の先端側に突起部１５ｃを設けたので、部品点数を増やすことなく、アークによる第２可動接触子１５の接点の損耗を抑制することができる。 As described above, according to the present embodiment, the protrusion 15c is provided on the distal end side of the second movable contact 15, so that the wear of the contact of the second movable contact 15 due to the arc is suppressed without increasing the number of parts. can do.
また、本発明の構成は、直流小電流を遮断する場合に特に有効である。すなわち、直流電流の遮断は、交流電流の遮断と異なり、数１０〜数１００ｍｓかかって遮断するケースがある。特に、小電流領域では、アーク自身に作用する電磁力が弱くなるため、アークが接点上に滞留しやすくなり、遮断時間が長くなったり、遮断不能が生じるおそれがある。
これに対して、本発明の構成を採用することにより、アークに作用する電磁力が弱い条件（小電流領域）においても、第２の可動接点側に発生したアークをすみやかに第２の可動接点から突起部に転流できるため、アークが磁性板に移動しやすくなり、遮断時間の延長や遮断不能を防止することができ、直流小電流の遮断性能を高めることができる。
The configuration of the present invention is particularly effective when cutting off a small direct current. That is, the interruption of the direct current differs from the interruption of the alternating current in some cases taking several tens to several hundreds of milliseconds. In particular, in a small current region, the electromagnetic force acting on the arc itself is weakened, so that the arc tends to stay on the contact, and there is a possibility that the interruption time becomes long or the interruption is impossible.
On the other hand, by adopting the configuration of the present invention, the arc generated on the second movable contact side can be quickly transferred to the second movable contact even under the condition where the electromagnetic force acting on the arc is weak (small current region). Therefore, the arc can easily move to the magnetic plate, the extension of the interruption time and the inability to interrupt can be prevented, and the interruption performance of a small direct current can be improved.
なお、本実施例では、突起部の形状を矩形状に形成したが、円弧状や三角形状などに形成してもよい。また、本実施例では、第２可動接触子の先端側に突起部を一体形成するようにしたが、突起部を第２可動接触子よりも融点の高い材料、例えば鉄などで形成すれば、アークの熱による突起部自体の損傷を防止することができる。前記突起部は第２可動接触子の先端部に溶接、接合等などにより接合してもよい。 In the present embodiment, the shape of the protrusion is formed in a rectangular shape, but may be formed in an arc shape or a triangular shape. In the present embodiment, the protrusion is integrally formed on the distal end side of the second movable contact, but if the protrusion is formed of a material having a melting point higher than that of the second movable contact, such as iron, It is possible to prevent the protrusion itself from being damaged by the heat of the arc. The protrusion may be joined to the tip of the second movable contact by welding, joining, or the like.
図３は、本発明の第２の実施形態を示す反発形の回路遮断器であり、（ａ）は反発形の回路遮断器の閉路状態を示す要部縦断面図、（ｂ）は（ａ）のＡ矢視図である。
図において、本実施例は、第２可動接触子１５の先端側に設けた突起部１５ｃに、第２可動接触子１５よりも融点の高い材料からなるカバー１５ｄを取り付けるようにしたものである。
FIG. 3 is a repulsive circuit breaker showing a second embodiment of the present invention. FIG. 3A is a longitudinal sectional view of a main part showing a closed state of the repulsive circuit breaker, and FIG. FIG.
In the figure, in this embodiment, a cover 15 d made of a material having a higher melting point than that of the second movable contact 15 is attached to a protrusion 15 c provided on the tip side of the second movable contact 15.
図３において、第２可動接触子１５の先端側には、第１の実施形態と同じように、突起部１５ｃが設けられている。この突出部１５ｃは、第２可動接触子１５の第２の可動接点１５ａよりも先端側に設けられており、かつ第２の可動接点１５ａの接触面よりも第１可動接触子３の先端側に突出して設けられている。
また、前記突起部１５ｃの表面には、コ字状からなる高融点材からなるカバー１５ｄが、接着、溶接などにより取り付けられている。カバー１５ｄとしては、第２可動接触子１５が銅から形成される場合に、銅よりも融点の高い鉄などを用いることができる。
上記の構成において、図３（ａ）の回路遮断器の閉路状態において、回路遮断器に短絡電流などの大電流が流れると、第１可動接触子３と第２可動接触子１５の間には電磁反発力が働き、両接触子３、１５は互いに離れる方向に開離し、第１の可動接点３ａと第２の可動接点１５ａとの間にアークが発生する。
ここで、第２の可動接点１５ａ側に発生したアークは、第２の可動接点１５ａから第２可動接触子１５の先端側に設けた突起部１５ｃに移動するが、突起部１５ｃには、第２可動接触子１５よりも融点の高い材料からなるカバー１５ｄが取り付けられているので、第２の可動接点１５ａ側のアークが突起部１５ｃに移動しても、カバー１５ｄによりアークの熱による突起部１５ｃ自体の損傷を防止することができる。
In FIG. 3, a protrusion 15 c is provided on the distal end side of the second movable contact 15 in the same manner as in the first embodiment. The projecting portion 15c is provided on the distal end side of the second movable contact 15 with respect to the second movable contact 15a, and the distal end side of the first movable contact 3 with respect to the contact surface of the second movable contact 15a. Is provided to protrude.
Further, a cover 15d made of a high melting point material having a U-shape is attached to the surface of the protruding portion 15c by adhesion, welding or the like. As the cover 15d, when the second movable contact 15 is made of copper, iron having a melting point higher than that of copper can be used.
In the above configuration, when a large current such as a short-circuit current flows through the circuit breaker in the closed state of the circuit breaker in FIG. 3A, the first breaker between the first movable contact 3 and the second movable contact 15. The electromagnetic repulsive force works, the two contacts 3 and 15 are separated from each other, and an arc is generated between the first movable contact 3a and the second movable contact 15a.
Here, the arc generated on the second movable contact 15a side moves from the second movable contact 15a to the protruding portion 15c provided on the distal end side of the second movable contact 15, but the protruding portion 15c includes 2 Since the cover 15d made of a material having a higher melting point than the movable contact 15 is attached, even if the arc on the second movable contact 15a side moves to the projection 15c, the projection due to the heat of the arc is caused by the cover 15d. Damage to 15c itself can be prevented.
なお、カバー１５ｄの形状は、コ字状以外にも、箱状や平板状でもよく、第２の可動接点から移動したアークの熱による突起部の損傷が防止できればよい。 The shape of the cover 15d may be a box shape or a flat plate shape other than the U-shape, as long as the damage of the protrusion due to the heat of the arc moved from the second movable contact can be prevented.
１ 本体ケース
３ 第１可動接触子
３ａ 第１の可動接点
７ 消弧室
１０ 接触ばね
１５ 第２可動接触子
１５ａ 第２の可動接点
１５ｃ 突起部
１５ｄ カバー
DESCRIPTION OF SYMBOLS 1 Main body case 3 1st movable contact 3a 1st movable contact 7 Arc-extinguishing chamber 10 Contact spring 15 2nd movable contact 15a 2nd movable contact 15c Protrusion part 15d Cover
Claims (3)
前記第２可動接触子は電流遮断時に電磁反発力を受けると第１可動接触子から前記接触ばねに抗して開極する回路遮断器において、
前記第２可動接触子の先端に、第２の可動接点の接触面よりも突出する突起部を設けたことを特徴とする回路遮断器。 A first movable contact having a first movable contact and driven to be opened and closed by an opening / closing mechanism, and a rotation having a second movable contact and biased toward the first movable contact by a contact spring A free second movable contact; and an arc extinguishing chamber that extinguishes an arc generated between the first and second movable contacts;
In the circuit breaker that opens the second movable contact against the contact spring from the first movable contact when receiving an electromagnetic repulsive force at the time of current interruption,
A circuit breaker characterized in that a protrusion projecting from the contact surface of the second movable contact is provided at the tip of the second movable contact.
2. The circuit breaker according to claim 1, wherein a cover made of a material having a higher melting point than that of the second movable contact is attached to the protrusion provided at the tip of the second movable contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009232396A JP2011081988A (en) | 2009-10-06 | 2009-10-06 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009232396A JP2011081988A (en) | 2009-10-06 | 2009-10-06 | Circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2011081988A true JP2011081988A (en) | 2011-04-21 |
Family
ID=44075847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009232396A Withdrawn JP2011081988A (en) | 2009-10-06 | 2009-10-06 | Circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2011081988A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57136714A (en) * | 1981-02-18 | 1982-08-23 | Mitsubishi Electric Corp | Switch |
| JPH07282710A (en) * | 1994-04-11 | 1995-10-27 | Mitsubishi Electric Corp | Open/close device |
| JP2007257906A (en) * | 2006-03-22 | 2007-10-04 | Fuji Electric Fa Components & Systems Co Ltd | Circuit breaker |
-
2009
- 2009-10-06 JP JP2009232396A patent/JP2011081988A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57136714A (en) * | 1981-02-18 | 1982-08-23 | Mitsubishi Electric Corp | Switch |
| JPH07282710A (en) * | 1994-04-11 | 1995-10-27 | Mitsubishi Electric Corp | Open/close device |
| JP2007257906A (en) * | 2006-03-22 | 2007-10-04 | Fuji Electric Fa Components & Systems Co Ltd | Circuit breaker |
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