JP2004087241A

JP2004087241A - Voltage switching device of circuit breaker

Info

Publication number: JP2004087241A
Application number: JP2002245193A
Authority: JP
Inventors: Hiroaki Kato; 加藤　裕明
Original assignee: Kawamura Electric Inc
Current assignee: Kawamura Electric Inc
Priority date: 2002-08-26
Filing date: 2002-08-26
Publication date: 2004-03-18
Anticipated expiration: 2022-08-26
Also published as: JP4117776B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker which can simplify the shape of a conductive bar and can perform conductive bar connecting work or voltage switching work simply at a mounting time. <P>SOLUTION: In a voltage switching device 8a, two terminal boards 10 can be connected to or disconnected from a power source side terminal 5a of one voltage pole and a power source side terminal 5b of a neutral pole, and are coupled by a substantially L-shape coupling plate 11. A rotary switch 9 can be operated from the exterior of a housing of the circuit breaker, and is fixed to the plate 11 so that the connecting destinations of the boards 10 are selectable. The boards 10 can be held by a crimp spring 12 fixed at one end to the plate 11 and at the other into the housing in a state that the boards 10 are brought into pressure contact with the terminal 5a or 5b. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、単相３線式分電盤の分岐回路に用いられる回路遮断器の電圧を切り替えるための構造に関する。
【０００２】
【従来の技術】
従来、図４及び図５に示すように単相３線式分電盤３６の分岐回路に用いられる回路遮断器２１はハウジング２２の背面２２ｃに２つの電源側端子２５ａ，２５ｂが設けられ、前面２２ｂに２つの負荷側端子２６ａ，２６ｂが設けられ、上面２２ｄに電路を開閉操作する操作ハンドル２７が設けられている。回路遮断器２１は単相３線式分電盤３６の主幹ブレーカ３７の２次側に接続された３本の主幹導電バー２４ａ，２４ｂ，２４ｃを挟んで両側に複数並設され、主幹導電バー２４ａ，２４ｂ，２４ｃから短手方向に延びる分岐導電バー３８ａ，３８ｂを電源側端子２５ａ，２５ｂに挿入し螺着して接続されている。主幹導電バー２４ａ，２４ｂ，２４ｃから分岐した２本１組の分岐導電バーの一方３８ａは電圧極の主幹導電バー２４ａ若しくは２４ｃと一体に形成され、分岐導電バーの他方３８ｂは取り外し可能で、分岐導電バーの一方３８ａが形成されていない電圧極の主幹導電バー２４ｃ，２４ａ又は中性極の主幹導電バー２４ｂのどちらかに選択的に螺着固定され、回路遮断器２１の電圧を１００Ｖから２００Ｖ又は２００Ｖから１００Ｖに切り替えるにはこの他方の分岐導電バー３８ｂを一旦取り外して接続する主幹導電バーを切り替えることにより行っていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来の方法では導電バーの形状が複雑になるし、分岐導電バーは主幹導電バー及び回路遮断器とネジで接続されているため、ネジを落として紛失する虞があり、取り付け時の接続作業及び電圧切り替え作業が面倒であり、更にネジの増し締めを定期的に行わなければならないという欠点があった。
【０００４】
そこで上記問題点に鑑み、本発明の目的は、導電バーの形状を単純化することができ、簡単に取り付け時の導電バー接続作業や電圧切り替え作業ができる回路遮断器を提供することである。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、ハウジングに３つの左右方向の溝を切り欠き形成し、溝内に単相３線式電路の導電バーを挟持接続するプラグイン形式の電源側端子を備えた分岐回路用の回路遮断器の電圧を切り替えるための電圧切替装置において、一方の電圧極の電源側端子と中性極の電源側端子に接離可能な２枚の端子板を略く字状の連結板で連結して設け、連結板にハウジングの外部から操作可能な回転式のスイッチを固着して端子板の接続先を選択可能にし、一端を連結板に固定し他端をハウジング内に固定した圧接バネによって端子板を電源側端子に圧接した状態で保持可能にしたことを特徴とする。
【０００６】
【発明の実施の形態】
一方の電圧極の電源側端子と中性極の電源側端子に接離可能な２枚の端子板を略く字状の連結板で連結して設け、連結板にハウジングの外部から操作可能な回転式のスイッチを固着して端子板の接続先を選択可能にし、一端を連結板に固定し他端をハウジング内に固定した圧接バネによって端子板を電源側端子に圧接した状態で保持可能にする。
【０００７】
【実施例】
本発明に係る回路遮断器の電圧切替装置の一実施例を図１〜図３の添付図面に基づいて説明する。
【０００８】
単相３線式分電盤の分岐回路に用いられる回路遮断器１はハウジング２の底面２ａの前後に３つの左右方向の溝３を切り欠き形成し、溝内に単相３線式電路の導電バー４ａ，４ｂ，４ｃを挟持接続するプラグイン形式の電源側端子５ａ，５ｂ，５ｃが設けられ、前面２ｂ及び背面２ｃの双方に２つの負荷側端子６ａ，６ｂ、６ｃ，６ｄが設けられ、上面２ｄの前後に電路を開閉操作する２つの操作ハンドル７ａ，７ｂが設けられている。前方の操作ハンドル７ａは前面２ｂの負荷側端子６ａ，６ｂの電路を開閉操作可能とし、後方の操作ハンドル７ｂは背面２ｃの負荷側端子６ｃ，６ｄの電路を開閉操作可能としている。電源側端子５ａ，５ｂ，５ｃは中央を中性極とし、前側と後側を電圧極としている。
【０００９】
また、ハウジング２の左右側面２ｅ，２ｆには負荷側端子６ａ，６ｂと負荷側端子６ｃ，６ｄの各電路に流れる電圧を切り替える電圧切替装置８ａ，８ｂのスイッチ９が夫々設けられている。図２においては片側の電圧切替装置しか示していないが、電圧切替装置８ａ，８ｂは略コ字状の電源側端子５ａ，５ｂ，５ｃの左右方向（図２では奥行き方向）を２分して一方側と他方側に夫々設けられ、電圧極の電源側端子５ａ，５ｃのうち１つと中性極の電源側端子５ｂの上面に接離する２枚の端子板１０と、これらの端子板１０を連結する連結板１１、端子板１０を電源側端子５ａ，５ｂ，５ｃに圧接する圧接バネ１２と、端子板１０の接続先を電圧極の電源側端子５ａ，５ｃ又は中性極の電源側端子５ｂに選択操作するためにハウジング２の左右側面２ｅ，２ｆに露出する回転式のスイッチ９とで成っている。
【００１０】
端子板１０は矩形状に形成され、略く字状に形成された連結板１１によって連結され一体に形成されている。スイッチ９は連結板１１の屈曲部の内側に固着され、電圧極の電源側端子５ａ又は５ｃと中性極の電源側端子５ｂとの中間位置でハウジング２の側面２ｅ，２ｆに形成された係合孔１３に嵌め込まれて回転可能に取り付けられている。圧接バネ１２は両端が直線に延びたコイル状のもので、一端を連結板１１の屈曲部に固定し、他端をスイッチ９より上の垂直方向に延びる中心線上のハウジング２の内部に固定されている。この圧接バネ１２によって端子板１０がどちらの電源側端子５ａ，５ｂに接触した場合でも端子板１０を電源側端子５ａ，５ｂに圧接するため安定した接触が確保できるようになっている。
【００１１】
こうしてハウジング２に組み込まれた電圧切替装置８ａ，８ｂは、連結板１１と、端子板１０が接触しない電圧極の電源側端子５ａ又は５ｃの双方に電線（図示せず）等を接続して電路に接続される。ハウジング２の右側面２ｆに配置された電圧切替装置８ａは連結板１１と電源側端子５ｃとに電線を接続してハウジング２の背面２ｃの負荷側端子６ｃ，６ｄの電路に接続され、ハウジング２の左側面２ｅに配置された電圧切替装置８ｂは連結板１１と電源側端子５ａとに電線を接続してハウジング２の前面２ｂの負荷側端子６ａ，６ｂの電路に接続されている。尚、これと逆にして電路に接続しても何ら問題ない。また、電線をどちらかの端子板に接続しても良い。
【００１２】
図３（ａ）のように電圧切替装置８ａのスイッチ９を操作して端子板１０が中性極の電源側端子５ｂに接続された場合は１００Ｖの電圧が通電され、図３（ｂ）のように端子板１０が電圧極の電源側端子５ａに接続された場合は２００Ｖの電圧が通電される。尚、電圧切替装置８ｂの場合はスイッチ９を操作して端子板１０が中性極の電源側端子５ｂに接続された場合に１００Ｖの電圧が通電され、端子板１０が電圧極の電源側端子５ｃに接続された場合に２００Ｖの電圧が通電される。スイッチ９はマイナスドライバー等で回転させなければならない形状であるため、回路遮断器１を分電盤に設置した状態ではスイッチ９の操作は困難で、電圧の切替操作は回路遮断器１を取り外した状態で行うようになっている。このため、通電中に誤って電圧が切り替わることがなく、また、電圧変動や極間短絡による負荷機器の破壊や故障が発生する虞がない。
【００１３】
尚、本実施例において回路遮断器は２個分を一体に形成したものを用いたため、電源側端子がハウジングの底面に設けられ、電源側端子に各電路用の２個の電圧切替装置を設けたが、ハウジングの前面又は背面にプラグイン形式の電源側端子を備えた回路遮断器にも利用することができ、この場合は電源側端子に１個の電圧切替装置を設ければ良い。
【００１４】
【発明の効果】
以上説明したようにハウジングに３つの左右方向の溝を切り欠き形成し、溝内に単相３線式電路の導電バーを挟持接続するプラグイン形式の電源側端子を備えた分岐回路用の回路遮断器において、一方の電圧極の電源側端子と中性極の電源側端子に接離可能な２枚の端子板を略く字状の連結板で連結して設け、連結板にハウジングの外部から操作可能な回転式のスイッチを固着して端子板の接続先を選択可能にし、一端を連結板に固定し他端をハウジング内に固定した圧接バネによって端子板を電源側端子に圧接した状態で保持可能にしたことにより、電源側端子がプラグイン形式なので導電バーの形状を単純化することができ、而も取り付け時の導電バー接続作業が簡単にでき、更に、電圧切り替えは電圧切替装置のスイッチを回転させるだけで簡単にできるという効果がある。
【図面の簡単な説明】
【図１】本発明に係る回路遮断器の外観斜視図である。
【図２】本発明に係る回路遮断器の電圧切替装置を示す正面図である。
【図３】本発明に係る回路遮断器の電圧切替装置の電圧切替構造を示し、（ａ）は供給電圧を１００Ｖにする場合、（ｂ）は供給電圧を２００Ｖにする場合である。
【図４】従来の回路遮断器を組み込んだ単相３線式分電盤を示す正面図である。
【図５】従来の回路遮断器と導電バーの電圧切り替え構造を示す斜視図である。
【符号の説明】
１…回路遮断器
２…ハウジング
３…溝
４ａ，４ｂ，４ｃ…導電バー
５ａ，５ｃ…電圧極の電源側端子
５ｂ…中性極の電源側端子
６ａ〜６ｄ…負荷側端子
７ａ，７ｂ…操作ハンドル
８ａ，８ｂ…電圧切替装置
９…スイッチ
１０…端子板
１１…連結板
１２…圧接バネ
１３…係合孔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for switching a voltage of a circuit breaker used in a branch circuit of a single-phase three-wire distribution board.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 4 and 5, a circuit breaker 21 used in a branch circuit of a single-phase three-wire distribution board 36 is provided with two power supply terminals 25a and 25b on a rear surface 22c of a housing 22 and a front surface. Two load-side terminals 26a and 26b are provided on 22b, and an operation handle 27 for opening and closing an electric circuit is provided on the upper surface 22d. A plurality of circuit breakers 21 are arranged in parallel on both sides of the three main conductive bars 24a, 24b, 24c connected to the secondary side of the main breaker 37 of the single-phase three-wire distribution board 36. Branch conductive bars 38a, 38b extending in the short direction from 24a, 24b, 24c are inserted into the power supply side terminals 25a, 25b and connected by screwing. One of the two sets of branched conductive bars 38a branched from the main conductive bars 24a, 24b, 24c is formed integrally with the main conductive bar 24a or 24c of the voltage electrode, and the other 38b of the branch conductive bar is removable and can be branched. One of the conductive bars 38a is selectively screwed and fixed to one of the main conductive bars 24c and 24a of the voltage pole where the one of the conductive bars 38a is not formed or the main conductive bar 24b of the neutral pole, and the voltage of the circuit breaker 21 is set to 100V to 200V. Alternatively, switching from 200V to 100V has been performed by temporarily removing the other branch conductive bar 38b and switching the main conductive bar to be connected.
[0003]
[Problems to be solved by the invention]
However, in the conventional method, the shape of the conductive bar becomes complicated, and the branch conductive bar is connected to the main conductive bar and the circuit breaker with a screw. The operation and the voltage switching operation are troublesome, and there is a disadvantage that the screws must be retightened periodically.
[0004]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a circuit breaker that can simplify the shape of a conductive bar and can easily perform a conductive bar connection operation and a voltage switching operation at the time of installation.
[0005]
[Means for Solving the Problems]
To achieve the above object, a branch circuit having a plug-in type power supply side terminal in which three lateral grooves are cut out and formed in a housing, and a conductive bar of a single-phase three-wire circuit is sandwiched and connected in the groove. Switching device for switching the voltage of a circuit breaker for use in a power supply terminal of one of the voltage poles and a power supply terminal of a neutral pole and two terminal plates which can be separated from and connected to each other in a substantially rectangular shape. A rotary switch operable from the outside of the housing is fixed to the connection plate to enable selection of the connection destination of the terminal plate. One end is fixed to the connection plate and the other end is fixed in the housing. It is characterized in that the terminal plate can be held in a state of being pressed against the power supply side terminal by a spring.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Two terminal plates which can be connected to and separated from the power supply side terminal of one of the voltage poles and the power supply side terminal of the neutral pole are connected by a substantially rectangular connecting plate, and the connecting plate can be operated from outside the housing. A rotary switch is fixed and the connection destination of the terminal plate can be selected, and the terminal plate can be held in a state in which the terminal plate is pressed against the power supply side terminal by a pressure contact spring with one end fixed to the connecting plate and the other end fixed in the housing. I do.
[0007]
【Example】
One embodiment of a voltage switching device for a circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.
[0008]
A circuit breaker 1 used in a branch circuit of a single-phase three-wire switchboard has three lateral grooves 3 cut out before and after a bottom surface 2a of a housing 2, and a single-phase three-wire circuit is provided in the groove. Plug-in type power supply terminals 5a, 5b, 5c for pinching and connecting the conductive bars 4a, 4b, 4c are provided, and two load terminals 6a, 6b, 6c, 6d are provided on both the front surface 2b and the rear surface 2c. , Two operation handles 7a and 7b for opening and closing the electric circuit before and after the upper surface 2d. The front operation handle 7a can open and close the electric circuit of the load side terminals 6a and 6b on the front surface 2b, and the rear operation handle 7b can open and close the electric circuit of the load side terminals 6c and 6d on the rear surface 2c. The power supply terminals 5a, 5b and 5c have a neutral pole at the center and voltage poles at the front and rear sides.
[0009]
The left and right side surfaces 2e and 2f of the housing 2 are provided with switches 9 of voltage switching devices 8a and 8b for switching voltages flowing through respective electric paths of the load terminals 6a and 6b and the load terminals 6c and 6d, respectively. Although only one voltage switching device is shown in FIG. 2, the voltage switching devices 8a and 8b divide the left and right direction (the depth direction in FIG. 2) of the substantially U-shaped power supply terminals 5a, 5b and 5c into two. Two terminal plates 10 provided on one side and the other side, respectively, for contacting and separating one of the power terminals 5a and 5c of the voltage electrode and the upper surface of the power terminal 5b of the neutral electrode; A connection plate 11, a pressure contact spring 12 for pressing the terminal plate 10 against the power supply terminals 5a, 5b, 5c, and a connection destination of the terminal plate 10 to the power supply terminals 5a, 5c of the voltage pole or the power supply side of the neutral electrode. A rotary switch 9 is exposed on the left and right side surfaces 2e and 2f of the housing 2 to select and operate the terminal 5b.
[0010]
The terminal plate 10 is formed in a rectangular shape, and is connected and integrally formed by a connecting plate 11 formed in a substantially rectangular shape. The switch 9 is fixed to the inside of the bent portion of the connecting plate 11, and is formed on the side surfaces 2e and 2f of the housing 2 at an intermediate position between the power supply terminal 5a or 5c of the voltage electrode and the power supply terminal 5b of the neutral electrode. It is fitted in the hole 13 so as to be rotatable. The press-contact spring 12 has a coil shape with both ends extending straight. One end is fixed to the bent portion of the connecting plate 11, and the other end is fixed inside the housing 2 on the center line extending vertically above the switch 9. ing. When the terminal plate 10 comes into contact with either of the power supply terminals 5a and 5b by the pressure contact spring 12, the terminal plate 10 is pressed against the power supply terminals 5a and 5b so that stable contact can be secured.
[0011]
The voltage switching devices 8a and 8b thus incorporated in the housing 2 connect electric wires (not shown) or the like to both the connection plate 11 and the power supply side terminals 5a or 5c of the voltage poles with which the terminal plate 10 does not contact. Connected to. The voltage switching device 8a disposed on the right side surface 2f of the housing 2 is connected to the connection plate 11 and the power supply side terminal 5c by connecting an electric wire to the electric circuit of the load side terminals 6c and 6d on the rear surface 2c of the housing 2. The voltage switching device 8b arranged on the left side surface 2e of the housing 2 is connected to electric wires of the connection plate 11 and the power supply terminal 5a, and is connected to the electric circuit of the load terminals 6a and 6b on the front surface 2b of the housing 2. It should be noted that there is no problem if the connection is made to the electric circuit in the opposite manner. Further, the electric wire may be connected to either terminal plate.
[0012]
As shown in FIG. 3 (a), when the switch 9 of the voltage switching device 8a is operated and the terminal plate 10 is connected to the power terminal 5b of the neutral electrode, a voltage of 100 V is applied, and the voltage of FIG. As described above, when the terminal plate 10 is connected to the power supply terminal 5a of the voltage electrode, a voltage of 200 V is supplied. In the case of the voltage switching device 8b, when the switch 9 is operated and the terminal plate 10 is connected to the power terminal 5b of the neutral electrode, a voltage of 100 V is supplied, and the terminal plate 10 is connected to the power terminal of the voltage electrode. When connected to 5c, a voltage of 200V is supplied. Since the switch 9 has a shape that must be rotated by a flathead screwdriver or the like, the operation of the switch 9 is difficult when the circuit breaker 1 is installed on the distribution board, and the voltage switching operation is performed by removing the circuit breaker 1. It is designed to be performed in a state. For this reason, there is no possibility that the voltage is erroneously switched during energization, and there is no danger of the load device being destroyed or broken due to voltage fluctuation or short circuit between the poles.
[0013]
In this embodiment, since two circuit breakers are integrally formed, the power supply side terminal is provided on the bottom surface of the housing, and the power supply side terminal is provided with two voltage switching devices for each electric circuit. However, it can also be used for a circuit breaker having a plug-in type power supply terminal on the front or back surface of the housing. In this case, one voltage switching device may be provided for the power supply terminal.
[0014]
【The invention's effect】
As described above, a circuit for a branch circuit having a plug-in type power supply side terminal in which three lateral grooves are cut out and formed in a housing and a conductive bar of a single-phase three-wire circuit is sandwiched and connected in the groove. In the circuit breaker, two terminal plates which can be connected to and separated from the power supply side terminal of one of the voltage poles and the power supply side terminal of the neutral pole are provided by being connected by a substantially rectangular connection plate. The terminal switch is pressed against the power supply terminal by a pressure spring with one end fixed to the connecting plate and the other end fixed in the housing by fixing a rotary switch that can be operated from Since the power supply side terminal is a plug-in type, the shape of the conductive bar can be simplified, the work of connecting the conductive bar at the time of installation can be simplified, and the voltage switching is performed by a voltage switching device. Rotate the switch There is an effect that only the can easily.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a circuit breaker according to the present invention.
FIG. 2 is a front view showing a voltage switching device of the circuit breaker according to the present invention.
3A and 3B show a voltage switching structure of a voltage switching device of a circuit breaker according to the present invention, wherein FIG. 3A shows a case where the supply voltage is set to 100V, and FIG. 3B shows a case where the supply voltage is set to 200V.
FIG. 4 is a front view showing a single-phase three-wire distribution board incorporating a conventional circuit breaker.
FIG. 5 is a perspective view showing a conventional circuit breaker and a voltage switching structure of a conductive bar.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2 ... Housing 3 ... Groove 4a, 4b, 4c ... Conductive bar 5a, 5c ... Power supply terminal 5b of a voltage pole ... Power supply terminal 6a-6d of a neutral pole ... Load terminal 7a, 7b ... Operation Handles 8a, 8b Voltage switching device 9 Switch 10 Terminal plate 11 Connection plate 12 Pressure spring 13 Engagement hole

Claims

ハウジングに３つの左右方向の溝を切り欠き形成し、該溝内に単相３線式電路の導電バーを挟持接続するプラグイン形式の電源側端子を備えた分岐回路用の回路遮断器の電圧を切り替えるための電圧切替装置において、一方の電圧極の電源側端子と中性極の電源側端子に接離可能な２枚の端子板を略く字状の連結板で連結して設け、該連結板に前記ハウジングの外部から操作可能な回転式のスイッチを固着して前記端子板の接続先を選択可能にし、一端を前記連結板に固定し他端を前記ハウジング内に固定した圧接バネによって前記端子板を前記電源側端子に圧接した状態で保持可能にしたことを特徴とする回路遮断器の電圧切替装置。Voltage of a circuit breaker for a branch circuit having a plug-in type power supply side terminal in which three lateral grooves are cut out and formed in a housing and a conductive bar of a single-phase three-wire circuit is sandwiched and connected in the grooves. In the voltage switching device for switching between the power supply side terminal of one of the voltage pole and the power supply side terminal of the neutral pole, two terminal plates that can be connected and separated from each other are provided by being connected by a substantially rectangular connection plate, A rotary switch operable from the outside of the housing is fixed to the connecting plate so that a connection destination of the terminal plate can be selected, and one end is fixed to the connecting plate and the other end is fixed by a pressure contact spring fixed in the housing. A voltage switching device for a circuit breaker, wherein the terminal plate can be held while being pressed against the power supply side terminal.