JP2749392B2 - Circuit breaker - Google Patents

Circuit breaker

Info

Publication number
JP2749392B2
JP2749392B2 JP1241353A JP24135389A JP2749392B2 JP 2749392 B2 JP2749392 B2 JP 2749392B2 JP 1241353 A JP1241353 A JP 1241353A JP 24135389 A JP24135389 A JP 24135389A JP 2749392 B2 JP2749392 B2 JP 2749392B2
Authority
JP
Japan
Prior art keywords
contact
fixed
movable
movable contact
fixed contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP1241353A
Other languages
Japanese (ja)
Other versions
JPH03102722A (en
Inventor
貢 高橋
孝夫 三橋
義昭 小林
士郎 村田
剛 今村
伸示 山県
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1241353A priority Critical patent/JP2749392B2/en
Publication of JPH03102722A publication Critical patent/JPH03102722A/en
Application granted granted Critical
Publication of JP2749392B2 publication Critical patent/JP2749392B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2066—Fork-shaped bridge; Two transversally connected contact arms bridging two fixed contacts

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は回路遮断器、特にその２点切り開閉部の改
良に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to an improvement of a double-point switchgear.

〔従来の技術〕[Conventional technology]

第３図は例えば特公昭57-45007号公報に示された従来
の回路遮断器の２点切り開閉部を示す斜視図である（筺
体、機構部は図示せず）。図において、（１）は第１の
固定接触子、（２）は第１の固定接触子（１）の一端に
固着された第１の固定接点、（３）は第１の固定接点
（２）と接離する第１の可動接点、（４）は一端に第１
の可動接点（３）が固着されて第１の固定接触子（１）
と略平行になる向きに対向状に置かれた第１の可動接触
子、（５）は第１の可動接触子（４）と並置された第２
の可動接触子、（６）は第２の可動接触子（５）の先端
に固着された第２の可動接点、（７）は第２の可動接点
（６）と接離する第２の固定接点、（８）は第２の固定
接点（７）が一端に固着されて第１の固定接触子（１）
とは逆の方向に延びた第２の固定接触子、（９）は両可
動接触子（４），（５）を連結する連結部、（10）は両
可動接触子（４），（５）を支持する回転軸である。ま
た図示していないが第1,第２の可動接触子（４），
（５）は各々の可動接点（３），（６）と第1,第２の固
定接触子（１），（８）の各固定接点（２），（７）と
の間に必要な接触圧力が得られるように回転軸（10）を
中心としたモーメントがかけられている。FIG. 3 is a perspective view showing a two-point open / close portion of a conventional circuit breaker disclosed in, for example, Japanese Patent Publication No. 57-45007 (a housing and a mechanism are not shown). In the figure, (1) is a first fixed contact, (2) is a first fixed contact fixed to one end of the first fixed contact (1), and (3) is a first fixed contact (2). ), A first movable contact which comes in contact with / separates from the first movable contact.
Movable contact (3) is fixed to the first fixed contact (1).
A first movable contact placed oppositely in a direction substantially parallel to the first movable contact; (5) a second movable contact placed side by side with the first movable contact (4);
(6) is a second movable contact fixed to the tip of the second movable contact (5), and (7) is a second fixed contact that comes into contact with and separates from the second movable contact (6). The contact (8) is a first fixed contact (1) having a second fixed contact (7) fixed at one end.
A second fixed contact extending in a direction opposite to that of the first movable contact, (9) a connecting portion connecting the two movable contacts (4) and (5), and (10) a two movable contact (4) and (5). ) Is a rotating shaft that supports Although not shown, the first and second movable contacts (4),
(5) is a necessary contact between each movable contact (3), (6) and each fixed contact (2), (7) of the first and second fixed contacts (1), (8). A moment about the axis of rotation (10) is applied so that pressure is obtained.

第３図に示した開閉部は、実際には第４図に示すよう
に絶縁物で構成された筺体内に納められている。第４図
において、（11）は筺体ベース、（12）は第１のアーク
消弧空間、（13）は第２のアーク消弧空間、（14）は第
1,第２のアーク消弧空間（12），（13）を隔てる隔壁、
（15）は可動接触子に回転モーメントを与えるバネであ
る。The opening / closing section shown in FIG. 3 is actually housed in a housing made of an insulating material as shown in FIG. In FIG. 4, (11) is a housing base, (12) is a first arc extinguishing space, (13) is a second arc extinguishing space, and (14) is a first arc extinguishing space.
1, a partition separating the second arc extinguishing space (12), (13),
(15) is a spring that applies a rotational moment to the movable contact.

次に動作について説明する。通常、電流は第３図中矢
印で示すように第１の固定接触子（１）→第１の固定接
点（２）→第１の可動接点（３）→第１の可動接触子
（４）→連結部（９）→第２の可動接触子（５）→第２
の可動接点（６）→第２の固定接点（７）→第２の固定
接触子（８）の順に流れる。こうした図示の閉状態から
機構部（図示せず）によって、第1,第２の可動接触子
（４），（５）が回転軸（10）を中心として時計回りに
回動すると、接点（２）と（３）および（６），（７）
が開離し、各々の接点間にアークが発生する。これらの
二つのアークは、隔壁（14）によって隔てられているた
め電気的に直列であり、一つのアークに比べてアーク柱
の長さは２倍である。従って、この構成の開閉部ではア
ーク電圧を２倍の速さで高めることができる。この結
果、電流は速やかに抑制され、遮断時間も短く、遮断器
の損傷も低減できる。Next, the operation will be described. Normally, the current is supplied as shown by an arrow in FIG. 3 to the first fixed contact (1) → the first fixed contact (2) → the first movable contact (3) → the first movable contact (4). → connecting part (9) → second movable contact (5) → second
, The movable contact (6) → the second fixed contact (7) → the second fixed contact (8). When the first and second movable contacts (4) and (5) are rotated clockwise about the rotation axis (10) by the mechanism (not shown) from the closed state shown in FIG. ) And (3) and (6), (7)
Are separated, and an arc is generated between each contact. These two arcs are electrically in series because they are separated by a partition (14), and the length of the arc column is twice as long as one arc. Therefore, in the opening / closing section having this configuration, the arc voltage can be increased twice as fast. As a result, the current is quickly suppressed, the interruption time is short, and the damage to the circuit breaker can be reduced.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

従来の回路遮断器の２点切り開閉部は以上のように構
成されているので、第１の可動接触子（４）と第１の固
定接触子（１）とに流れる電流は平行でかつ逆方向のた
め、短絡電流等の大電流時には電磁反発力により第１の
可動接触子（４）には第３図の（Ｆ）で示した方向の強
大な力が働き、この力を接点の開離に利用できる。一方
第２の可動接触子（５）と第２の固定接触子（８）との
間には電流が同じ方向に流れるため電磁反発力が働かず
接点の開離に利用できない。さらに、このように第1,第
２の接触子対が対称に構成されていないために第1,第２
の可動接触子（４），（５）に働く力が非対称となり、
連結部（９）をねじる方向に力が働く。大電流時におい
ては、このねじれの力は強大になり、連結部（９）が破
損する可能性がある。従って、従来の構成では連結部
（９）を上記のねじれの力に耐えるようにしておく必要
がある。また連結部（９）を剛体でなく編線にしても、
ねじれが繰り返されると破断する恐れがある。また、第
1,第２の接触子対の構成が対称でないために第1,第２の
消弧空間（12），（13）における磁場分布が異なり、そ
のために第１のアークと第２のアークとの動きや、消弧
の様子が異なる。この結果、アークによる損傷程度が第
1,第２の消弧空間（12），（13）において異なり、これ
を考慮した計画が必要になるという問題点があった。Since the two-point open / close portion of the conventional circuit breaker is configured as described above, the currents flowing through the first movable contact (4) and the first fixed contact (1) are parallel and opposite. In the case of a large current such as a short-circuit current, a strong force acts in the direction shown in FIG. 3 (F) on the first movable contact (4) due to the electromagnetic repulsive force at the time of a large current such as a short-circuit current. Available for separation. On the other hand, current flows between the second movable contact (5) and the second fixed contact (8) in the same direction, so that the electromagnetic repulsion does not work and cannot be used for opening contacts. Further, since the first and second contact pairs are not configured symmetrically,
The forces acting on the movable contacts (4) and (5) become asymmetric,
A force acts in the direction of twisting the connecting part (9). At the time of a large current, the torsional force becomes strong, and the connecting portion (9) may be damaged. Therefore, in the conventional configuration, it is necessary to make the connecting portion (9) withstand the above-mentioned torsional force. Also, if the connecting portion (9) is not a rigid body but a knitted wire,
Repeated torsion may cause breakage. Also,
1, the magnetic field distribution in the first and second arc-extinguishing spaces (12) and (13) is different because the configuration of the second contactor pair is not symmetrical, so that the first arc and the second arc Movement and arc extinction are different. As a result, the degree of damage
1, There is a problem that the second arc extinguishing space (12), (13) is different, and a plan taking this into consideration is required.

この発明は上記のような問題点を解消するためになさ
れたもので、接点を高速に開離でき、しかも第1,第２の
可動接触子間の連結部の機械的強度が低くても破損する
恐れがなく、また二つのアークの動きの違いを考慮した
設計が不要となる回路遮断器を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and enables the contacts to be quickly opened and damaged even if the mechanical strength of the connecting portion between the first and second movable contacts is low. It is an object of the present invention to provide a circuit breaker which does not need to be designed in consideration of a difference between two arc movements.

〔課題を解決するための手段〕[Means for solving the problem]

この発明に係る回路遮断器は、第１の固定接触子と可
動接触子間および第２の固定接触子と可動接触子間にそ
れぞれ逆方向電流による電磁反発力を生じさせ、かつ第
1,第２の接触子対の構造を隔壁に対して対称にしたもの
である。The circuit breaker according to the present invention generates an electromagnetic repulsion by a reverse current between the first fixed contact and the movable contact and between the second fixed contact and the movable contact, and
1. The structure of the second contactor pair is symmetrical with respect to the partition.

〔作用〕[Action]

この発明における回路遮断器は、端部が連結されて同
じ方向に回動する第1,第２の可動接触子に共に逆方向電
流による電磁反発力が働いて接点の開離を助け、しかも
大きさが等しいために連結部に無理なねじれの力が働か
ないし、また二つの消弧空間の磁場分布が等しいために
アークの動きの違いによる設計上の特別な配慮が不要と
なる。In the circuit breaker according to the present invention, both the first and second movable contacts whose ends are connected and rotate in the same direction are acted on by electromagnetic repulsion by a reverse current, thereby assisting the opening of the contacts. Due to the equality, no unreasonable twisting force acts on the connecting portion, and since the magnetic field distributions of the two arc-extinguishing spaces are equal, special design considerations due to differences in arc movements are not required.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。第
１図において、（8A）は第１の固定接触子（１）と隔壁
（14）を隔てて対称に並置された第２の固定接触子、
（5A）は隔壁（14）をはさんで第１の可動接触子（４）
と対称に並置された第２の可動接触子、（9A）は第1,第
２の可動接触子（４），（5A）をつなぐ連結部である。
なお、図中従来のものと同一または相当部分には同一符
号を付して説明を省略する。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (8A) is a second fixed contact symmetrically juxtaposed with the first fixed contact (1) and a partition (14),
(5A) is the first movable contact (4) sandwiching the partition (14)
The second movable contact (9A), which is symmetrically juxtaposed with the first movable contact (9A), is a connecting portion connecting the first and second movable contacts (4) and (5A).
In the drawings, the same or corresponding parts as those in the related art are denoted by the same reference numerals, and description thereof is omitted.

第１図において、通常電流は矢印で示すように第１の
固定接触子（１）→第１の固定接点（２）→第１の可動
接点（３）→第１の可動接触子（４）→連結部（9A）→
第２の可動接触子（5A）→第２の可動接点（６）→第２
の固定接点（７）→第２の固定接触子（8A）の順に流れ
る。可動接触子と固定接触子とに流れる電流は平行でか
つ向きが逆であるため、電磁反発力が働く。可動接触子
に働くこの力は、図に示すように第１の可動接触子
（４）では（Ｆ1）、第２の可動接触子（5A）では
（Ｆ2）である。この力（Ｆ1），（Ｆ2）によって、可
動接触子（４），（5A）は回転軸（10）の回りに接点
（２）と（３）および（６）と（７）が開離する方向に
回動しようとする。電流値が定格電流のときは、接圧バ
ネ（図示せず）によって力（Ｆ1），（Ｆ2）による回動
接触子の回動は押えられている。しかし短絡電流のよう
な大電流時には電磁反発力は強大になり、接圧バネの力
を越え可動接触子（４），（5A）は急激に回転軸（10）
を中心として回動する。このときの電磁反発力
（Ｆ1），（Ｆ2）は、固定接触子と可動接触子とにおけ
る互いに平行で逆方向の電流経路の長さで決まる。この
発明においては、第1,第２の接触子対における上記電流
経路の長さが等しくなるように、第1,第２の接触子対を
隔壁（14）を挟んで対称に構成したので、電磁反発力
（Ｆ1），（Ｆ2）とは等しい。すなわち、第1,第２の可
動接触子（４），（5A）に働く力が対称である。従っ
て、これらの可動接触子（４），（5A）の動きも対称に
なり、強大な電磁反発力が働いたとしても、連結部（9
A）にねじれ等の無理な力がかからず、必要な機械的強
度を減らすことができる。また連結部（9A）の機械的強
度が必要でないことから、可動接触子（４），（5A）と
連結部（9A）を含めた可動部全体の質量を軽く構成で
き、高速開極にも有利である。さらに、第1,第２の接触
子対が隔壁（14）を挟んで対称であるために、接触子に
流れる電流による磁場分布が、第1,第２の消弧空間（1
2），（13）において同じになる。従って、アークの動
きや消弧の様子も第1,第２の消弧空間（12），（13）で
同じなため、アークの動きの違いに対する特別な配慮が
必要でなくなる。このため、設計が容易になる利点もあ
る。In FIG. 1, the normal current is the first fixed contact (1) → the first fixed contact (2) → the first movable contact (3) → the first movable contact (4) as shown by the arrow. → Connecting part (9A) →
Second movable contact (5A) → second movable contact (6) → second
Flows from the fixed contact (7) to the second fixed contact (8A). Since the currents flowing through the movable contact and the fixed contact are parallel and opposite in direction, an electromagnetic repulsion acts. The force acting on the movable contact is in the first movable contact (4) as shown in FIG. (F 1), a second movable contact (5A) in (F 2). Due to these forces (F 1 ) and (F 2 ), the movable contacts (4) and (5A) open the contacts (2) and (3) and (6) and (7) around the rotation axis (10). Attempts to rotate in the direction away. When the current value is the rated current, the rotation of the rotary contact by the forces (F 1 ) and (F 2 ) is suppressed by the contact pressure spring (not shown). However, at the time of a large current such as a short-circuit current, the electromagnetic repulsion becomes strong and exceeds the force of the contact pressure spring, and the movable contacts (4) and (5A) suddenly rotate (10).
Around the center. At this time, the electromagnetic repulsion (F 1 ) and (F 2 ) are determined by the lengths of current paths in the fixed contact and the movable contact which are parallel and opposite to each other. In the present invention, the first and second contact pairs are configured symmetrically with the partition wall (14) interposed therebetween so that the lengths of the current paths in the first and second contact pairs are equal. The electromagnetic repulsion (F 1 ) is equal to (F 2 ). That is, the forces acting on the first and second movable contacts (4) and (5A) are symmetric. Therefore, the movements of these movable contacts (4) and (5A) are also symmetrical, and even if a strong electromagnetic repulsion is applied, the connecting portion (9
A) No excessive force such as twisting is applied to A), and the required mechanical strength can be reduced. In addition, since the mechanical strength of the connecting part (9A) is not required, the mass of the entire movable part including the movable contacts (4) and (5A) and the connecting part (9A) can be made light, and high-speed opening can be achieved. It is advantageous. Further, since the first and second contact pairs are symmetrical with respect to the partition wall (14), the magnetic field distribution due to the current flowing through the contacts is reduced by the first and second arc-extinguishing spaces (1).
The same applies to 2) and (13). Therefore, since the movement of the arc and the state of arc extinction are the same in the first and second arc extinction spaces (12) and (13), no special consideration is required for the difference in arc movement. For this reason, there is an advantage that the design becomes easy.

〔発明の効果〕〔The invention's effect〕

以上のように、この発明によれば第１の固定接触子と
可動接触子間および第２の固定接触子と可動接触子間に
それぞれ逆方向電流による電磁反発力を生じさせ、かつ
二つの接触子対を対称に構成したので、前記電磁反発力
を接点の開離に有効に利用して接点を高速に開離でき、
しかも可動接触子に必要とされる機械的強度を低減する
ことができ、また設計が容易に行える回路遮断器が得ら
れるという効果がある。As described above, according to the present invention, an electromagnetic repulsive force is generated between the first fixed contact and the movable contact and between the second fixed contact and the movable contact by a reverse current, and the two contact Since the child pairs are configured symmetrically, the electromagnetic repulsion force can be effectively used for opening the contacts, and the contacts can be quickly opened,
In addition, the mechanical strength required for the movable contact can be reduced, and a circuit breaker that can be easily designed can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

第１図はこの発明の一実施例による回路遮断器の開閉部
を示す斜視図、第２図は従来のものの開閉部を示す斜視
図、第３図は第２図の開閉部を筺体内に組み込んだ状態
を示す斜視図である。 図において、（１）は第１の固定接触子、（２）は第１
の固定接点、（３）は第１の可動接点、（４）は第１の
可動接触子、（5A）は第２の可動接触子、（６）は第２
の可動接点、（７）は第２の固定接点、（8A）は第２の
固定接触子、（9A）は連結部、（14）は隔壁を示す。 なお、図中同一符号は同一または相当部分を示す。FIG. 1 is a perspective view showing an open / close portion of a circuit breaker according to one embodiment of the present invention, FIG. 2 is a perspective view showing a conventional open / close portion, and FIG. 3 is a diagram showing the open / close portion of FIG. It is a perspective view showing the state where it was incorporated. In the figure, (1) is the first fixed contact, (2) is the first fixed contact.
(3) is a first movable contact, (4) is a first movable contact, (5A) is a second movable contact, and (6) is a second movable contact.
, (7) is a second fixed contact, (8A) is a second fixed contact, (9A) is a connecting portion, and (14) is a partition. In the drawings, the same reference numerals indicate the same or corresponding parts.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 義昭 兵庫県尼崎市塚口本町８丁目１番１号 三菱電機株式会社中央研究所内 (72)発明者 村田 士郎 広島県福山市緑町１番８号 三菱電機株 式会社福山製作所内 (72)発明者 今村 剛 広島県福山市緑町１番８号 三菱電機株 式会社福山製作所内 (72)発明者 山県 伸示 広島県福山市緑町１番８号 三菱電機株 式会社福山製作所内 (56)参考文献 特開 昭58−209815（ＪＰ，Ａ) 実開 昭63−165732（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Kobayashi 8-1-1, Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture Inside the Central Research Laboratory of Mitsubishi Electric Corporation (72) Inventor Shiro Murata 1-8 Midoricho, Fukuyama City, Hiroshima Prefecture Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Tsuyoshi Imamura 1-8 Midoricho, Fukuyama City, Hiroshima Prefecture Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Shinji Yamagata 1-8 Midoricho, Fukuyama City, Hiroshima Mitsubishi Electric Corporation (56) References JP-A-58-209815 (JP, A) JP-A-63-165732 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】一端に第１の固定接点が固着された第１の
固定接触子と、同じく一端に前記第１の固定接点に接離
可能な第１の可動接点が固着されて前記第１の固定接触
子と略平行になる向きに対向状に置かれ、前記第１の固
定接触子と逆方向の電流が流れる第１の可動接触子とか
らなる第１の接触子対、および前記第１の接触子対と面
対称に配置され、一端に第２の固定接点が固着された第
２の固定接触子と、同じく一端に前記第２の固定接点に
接離可能な第２の可動接点が固着されて前記第２の固定
接触子と略平行になる向きに対向状に置かれ、前記第２
の固定接触子と逆方向の電流が流れる第２の可動接触子
とからなる第２の接触子対を有し、前記第１、第２の可
動接触子は各他端を互いに導電体にて連結し接点開離時
に軸を中心として同じ方向に回動する開閉部を備えたこ
とを特徴とする回路遮断器。A first fixed contact having one end fixed with a first fixed contact; and a first movable contact which is fixed to one end with the first fixed contact, the first movable contact being fixed to the first fixed contact. A first contact pair comprising: a first movable contact that is placed opposite to the fixed contact in a direction substantially parallel to the first fixed contact, and a current that flows in a direction opposite to that of the first fixed contact; A second fixed contact having a second fixed contact fixed to one end thereof and a second movable contact capable of coming into contact with and separating from the second fixed contact at one end. Are fixed to each other so as to be substantially parallel to the second fixed contact and opposed to each other.
And a second movable contact pair comprising a second movable contact through which a current flows in the opposite direction. The first and second movable contacts have their other ends connected to each other by a conductor. A circuit breaker, comprising: an open / close portion that is connected and rotates in the same direction about an axis when a contact is separated.
JP1241353A 1989-09-18 1989-09-18 Circuit breaker Expired - Fee Related JP2749392B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1241353A JP2749392B2 (en) 1989-09-18 1989-09-18 Circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1241353A JP2749392B2 (en) 1989-09-18 1989-09-18 Circuit breaker

Publications (2)

Publication Number Publication Date
JPH03102722A JPH03102722A (en) 1991-04-30
JP2749392B2 true JP2749392B2 (en) 1998-05-13

Family

ID=17073036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1241353A Expired - Fee Related JP2749392B2 (en) 1989-09-18 1989-09-18 Circuit breaker

Country Status (1)

Country Link
JP (1) JP2749392B2 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5657214A (en) * 1979-10-16 1981-05-19 Mitsubishi Electric Corp Switch
JPS5745007A (en) * 1980-08-30 1982-03-13 Matsushita Electric Works Ltd Manufacture of artificial decorative veneer
US4810841A (en) * 1986-07-31 1989-03-07 Siemens Aktiengesellschaft Current-limiting switching element
JPS63165732U (en) * 1987-04-18 1988-10-28

Also Published As

Publication number Publication date
JPH03102722A (en) 1991-04-30

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