JP4092599B2 - Branch circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distribution board mainly used as a lamp distribution board, and an agreement-type plug-in branch circuit breaker used in the distribution board.
[0002]
[Prior art]
The electric distribution board is mainly a single-phase three-wire system. In this case, in order to connect the main circuit breaker and the branch circuit breaker, they are arranged parallel to each other in the width direction along the bottom surface of the distribution board. A main circuit breaker is connected to three main conductors (bus bars) made of flat conductors, and branch circuit breakers arranged in two rows on both sides of the bus bar are connected to both ends of the branch conductors that are screw-connected perpendicularly to the bus bars. A connection configuration is generally employed (see Japanese Utility Model Publication No. 59-13006).
[0003]
[Problems to be solved by the invention]
However, the above arrangement requires a large space in the horizontal direction because the bus bars are arranged in a plane, and it takes time to connect the screw between the bus bar and the branch conductor and the screw connection between the branch conductor and the branch circuit breaker. There's a problem. Therefore, there is a configuration according to Japanese Utility Model Publication No. 59-44106 as a solution. This is because three bus bars are arranged so as to be orthogonal to the bottom surface of the panel, while a connecting blade is attached to the mounting surface (bottom surface) of the branch circuit breaker, and the branch circuit breaker is attached to the bus bar via the connecting blade. It is plugged in from above.
[0004]
In the construction according to the above-mentioned Japanese Utility Model Publication No. 59-44106, the bus bar is arranged so as to be orthogonal to the bottom surface of the board, so that the required space in the lateral direction is reduced and the branch circuit breaker is directly connected to the bus bar from above. Since it is plugged in, it is excellent in that branch conductors and screw connections are unnecessary. However, since only one row of branch circuit breakers can be connected to three single row bus bars, two rows of bus bars are required to arrange and connect two rows of branch circuit breakers on both sides of the main circuit breaker. There is a problem that it becomes necessary.
[0005]
The inventors of this application, on the other hand, have already agreed on a 1-pole size and 2-pole circuit breaker (a circuit breaker for wiring and a 2-pole type) in which a 2-pole switching part is accommodated in a 25 mm wide JIS agreement-type dimension. An earth leakage breaker) was developed, and a patent application was filed by the applicant of this application (Japanese Patent Application No. 9-147345). This circuit breaker can be wired with a single circuit breaker of the agreement type width dimension (25m) for both 100V circuit and 200V circuit in single-phase three-wire circuit. The installation space is reduced and the wiring man-hours are reduced.
[0006]
An object of the present invention is to provide a branch circuit breaker suitable for a distribution circuit breaker used in a distribution board that can be connected by connecting a small number of two rows of branch circuit breakers, and particularly suitable for the above-mentioned agreement type 1-pole size and 2-pole type circuit breaker. It is to provide a circuit breaker.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, first, the branch circuit breaker according to claim 1 is composed of a two-pole circuit breaker, and has an interval between three bus bars arranged in a flat shape at the power supply side end portion. A pair of contact pieces sandwiching the bus bar are respectively provided in three concave portions provided in the upper and lower portions, and any two of the three concave portions, and loosely inserted into the concave portions. Can be connected to the main contact of the circuit breaker or the conductive plate holding the main contact, respectively, and can swing up and down in the recess by its own bending. And a flexible lead plate to be supported .
[0008]
According to such a branch circuit breaker, when the branch circuit breaker is inclined and inserted or removed from the bus bar from the side, the terminal plug can swing according to the insertion / extraction angle. The circuit breaker can be easily attached and detached, and the danger of the terminal plug being deformed by an excessive force is eliminated.
[0009]
The branch circuit breaker according to claim 2 is the branch circuit breaker according to claim 1, wherein one of the three recesses having no terminal plug has a U-shaped insulating member therein. To do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 is a diagram showing the arrangement and connection of bus bars and circuit breakers in a distribution board. FIG. 1 (A) is a side view, FIG. 1 (B) is a front view, and FIG. FIG. In FIG. 1, a mounting base 1 made of a steel plate is formed by bending mounting flanges 1 a on both left and right sides, and is fixed to a bottom surface of a distribution board main body (not shown) by screws passing through the mounting holes 2. The main circuit breaker 3 is fixed with screws at the upper center of the mounting base 1, and three bus bars 4, 5, 6 constituting R, N, and T phases are connected to the load side terminals, respectively. The bus bars 4, 5 and 6 are made of the same size rectangular conductors, and are placed in two layers at the top and bottom via 3 types and 4 insulation bushes 7, 8 and 9 respectively, that is, up and down parallel to the bottom of the distribution board. Are arranged at equal intervals. Each of the insulating bushes 7, 8, and 9 is configured as a stepped cylindrical body having a head and a shaft portion having a smaller diameter than that of the head. The insulating bush 7 has a lower head height than the other two, The insulating bush 9 is slightly different in size in that the diameter of the shaft portion is larger than the other two.
[0011]
The insulating bushes 7 and 8 are laminated so that the small-diameter shaft portions are inserted into through holes (not shown) of the bus bars 4, 5, and 6, and are fitted into recesses (not shown) of the heads of the lower insulating bushes 8 and 9. Then, it is fastened to the mounting base 1 integrally with the bus bars 4, 5, 6 by a through bolt 10 for inserting them. As a result, the head of one insulating bush 8 separates the R-phase bus bar 4 from the N-phase bus bar 5, and the head of the other insulating bush 8 separates the gap between the N-phase bus bar 5 and the T-phase bus bar 6. The T-phase bus bar 6 and the mounting base 1 are separated by an insulation bush 9.
[0012]
Between the main circuit breaker 3 and the bus bars 4, 5, 6, flat connection conductors 11, 12, 13 aligned in the vertical direction by the bent step portions and aligned in the horizontal direction by the L-shape are provided. The terminal screw 14 and the connection screw 15 are connected to each other. Upper surfaces of the R-phase bus bar 4 and the connection conductors 11, 12, 13 are covered with a flat insulating cover 16. The insulating cover 16 has a T-shape in which the portion covering the connection conductors 11, 12, 13 is wider than the portion covering the R-phase bus bar 4, and the gaps 17 have the same height as the head of the insulating bush 7. It is fastened to the R-phase bus bar 4 by mounting screws 18. The branch circuit breakers 19 are arranged in two rows on both sides of the bus bars 4, 5, 6. These branch circuit breakers 19 are inserted and connected to the bus bars 4, 5, 6 from the side to fix the front and rear. The claw 20 and the movable claw 21 are fixed to the mounting base 1. The bus bars 4, 5 and 6 of the R, N and T phases constitute a single-phase three-wire circuit. The AC phase is 100V between the R phase and the T phase and between the T phase and the N phase, and the AC phase between the R phase and the T phase is 200V. .
[0013]
2 and 3 show the branch circuit breaker 19. FIG. 2 (A) is a front view with the power supply side end of the cover removed, and FIG. 2 (B) shows the inside with the cover removed. The left side view and FIG. 3 are also right side views. The illustrated branch circuit breaker 19 is an earth leakage circuit breaker in which two-pole switching parts are accommodated within a 25 mm agreement-type width dimension. These switching parts are arranged on both sides of the main body case 22 constituting the central partition wall, and the left pole 2 (B) includes a fixed contact 23 and a movable contact 24, and the right pole (FIG. 3) includes a fixed contact 25 and a movable contact 26. Thus, on the left pole side, the current is fixed contact 23 → fixed contact 23a → movable contact 24a → movable contact 24 → lead wire 27 → bimetal 28a of overcurrent trip device 28 → zero-phase current transformer 29 primary. It flows along the path from the conductor 30 to the load side terminal 31. Similarly, on the right pole side, fixed contact 25 → fixed contact 25a → movable contact 26a → movable contact 26 → lead wire 32 → bimetal 33a of overcurrent trip device 33 → primary conductor of zero-phase current transformer 29 It flows in the path of 34 → load side terminal 35. These energization paths are covered with a pair of left and right covers 36 and 37 (FIG. 2A) mounted on both sides of the main body case 22 (Note that the detailed configuration and operation of the branch circuit breaker 19 are specially described. (See Japanese Patent Application No. 9-147345).
[0014]
Here, the branch circuit breaker 19 has a terminal plug 38 at the power source side end. The terminal plug 38 is mounted in three upper and lower recesses provided in the main body case 22, and these recesses are separate plug bases as shown in FIG. 6 ((A) is a front view and (B) is a side view). The plug base 39 is fitted into the power source side end of the main body case 22 from the side surface. That is, in FIG. 6, the plug base 39 made of mold resin is formed with three Ω-shaped recesses 40 at the top and bottom. A pair of arms 39a projecting to the left and right are provided at the lower part of the plug base 39, and shallow grooves are formed on the back surface of the arms. The arms 39a connect the left and right pole fixed contacts 23, 25 from the back surface. This is for supporting the pressure (see FIG. 2B). On the other hand, FIG. 7 ((A) is a front view and (B) is a side view) shows a terminal plug 38, and the terminal plug 38 made of a phosphor bronze plate is bent into an Ω shape along the recess 39, and the bus bars 4, 5 , 6 is formed between the upper and lower sides, and a connecting piece 38b extending in one side is integrally provided in a tongue shape at the bottom.
[0015]
2 and 3, the terminal plug 38 is attached from the side to the uppermost and lowermost concave portions 40 of the plug base 39 fitted in the main body case 22, and as shown in FIG. 2A, as shown in FIG. Is directed to the left pole at the top and to the right pole at the bottom. Then, one end of a lead plate 41 (FIG. 2B) and 42 (FIG. 3) made of a phosphor bronze thin plate is joined to the front end portion of the connection piece 38b protruding from the left and right side surfaces of the main body case 22 by spot welding. The other ends of the lead plates 41 and 42 are also joined to the fixed contacts 23 and 25 by spot welding. Here, the gap between the contact pieces 38 a (FIG. 7) is set slightly narrower than the thickness of the bus bars 4, 5, 6, while the terminal plug 38 is loosely inserted into the recess 40 and vertically Consideration is given to allow for some swinging (rotation) movement.
[0016]
On the other hand, insulating caps 43 are respectively attached to the side of the uppermost and lowermost concave portions 40 where the connection pieces 38b are not provided and the left and right sides of the intermediate concave portion 40 where the terminal plugs 38 are not provided. FIG. 8 ((A) is a front view and (B) is a side view) shows an insulating cap 43. The insulating cap 43 made of nylon has a U-shaped cover portion 43a and a flange-like fitting portion 43b at one end thereof. In addition, it is integrally formed in the illustrated shape comprising the positioning portion 43c adjacent thereto. The insulating cap 43 is press-fitted so that the fitting portion 43b is fitted to the above-described side of the recess 40 and the positioning portion 43c is in contact with the side surface of the main body case 22 (plug base 39). The insulation between 41 and the bus bar 5 and the blinding on the appearance are performed.
[0017]
9, the branch circuit breaker 19 is inserted into the bus bars 4, 5 and 6 obliquely from the side as shown in FIG. 9, and in the case of FIGS. 2 and 3, the contact piece 38a of the terminal plug 38 is used for the R-phase bus bar 4 And the T-phase bus bar 6 are electrically connected to each other. At that time, the concave portion 22a of the main body case 22 is fitted to a fixed claw 45 made of a steel plate fixed in advance on the upper surface of the mounting base 1 with screws 44, and then the movable claw 47 made of a leaf spring fixed with screws 46 is recessed. The branch circuit breaker 19 is fixed to the mounting base 1 as shown in FIG. Thereby, the branch circuit breaker 19 is inserted and connected between the R phase and the T phase, that is, the 200 V circuit. In order to remove the branch circuit breaker 19, the front of the branch circuit breaker 19 is lifted, the movable claw 47 is removed, and the branch circuit breaker 19 is pulled out.
[0018]
In the installation / removal of the branch circuit breaker 19 described above, when the branch circuit breaker 19 is inclined, a vertical rotational force acts on the terminal plug 38 from the bus bars 4, 5, 6. As described above, the plug 38 is movably mounted in the recess 40, and the lead plates 41 and 42 joined thereto are also flexible, so that the terminal plug 38 follows the rotational force. It moves slightly and does not cause damage such as deformation. On the other hand, when there is an accident in the load circuit and the target branch circuit breaker 19 is replaced, it is necessary to remove and reattach the branch circuit breaker 19 without stopping energization of the healthy circuit. In such a case, since the upper surfaces of the bus bar 4 and the connection conductors 11, 12, 13 are covered with the insulating cover 16, the fingertip does not touch the charging part during the operation shown in FIG. The container 19 can be attached and detached safely.
[0019]
The branch circuit breaker 19 shown in FIGS. 2 and 3 is 200V compatible, but in the case of 100V compatible, the terminal plug 38 is attached at the position shown in FIG. 4 or FIG. 4 and 5 are side views showing only the power supply side end portion of the branch circuit breaker 19, in which (A) shows the left pole side and (B) shows the right pole side, respectively. In FIG. 4, the terminal plug 38 is mounted in the recesses 40 at the uppermost part and the intermediate part, and in this case, 100 V is taken out from between the R phase and the N phase. On the other hand, in FIG. 5, the terminal plug 38 is attached to the middle portion and the lowermost concave portion 40. In this case, 100V is taken out from between the N phase and the T phase. As described above, the specification of the branch circuit breaker 19 can be easily selected from three types of 200V and two types of 100V by the combination of the positions of the terminal plugs 38, and the circuit configuration of the existing distribution board can be changed to the branch circuit breaker 19. It can be easily changed only by exchanging.
[0020]
In the above embodiment, the branch circuit breaker is an agreement type 1-pole size and 2-pole type earth leakage breaker. However, the circuit breaker may be a wiring breaker and, of course, the conventional 2-pole width dimension is 50 mm. The present invention can also be applied to a circuit breaker for wiring or a circuit breaker.
[0021]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
(1) As a branch circuit breaker, at the power supply side end of a two-pole circuit breaker, three concave and convex portions are provided in accordance with the spacing of three flat-stacked bus bars made of rectangular conductors. A terminal plug having a pair of contact pieces sandwiching the bus bar in any two of the recesses is loosely inserted into the recess and movably mounted, and the terminal plug has flexibility. When installing / removing a branch circuit breaker at an angle by connecting it to the main contact of the circuit breaker or a conductive plate holding the main contact with the lead plate so that it can swing up and down in the recess. The terminal plug swings according to the insertion angle, and the branch circuit breaker is easily attached and detached, and the terminal plug is not deformed by an excessive force.
(2) As a branch circuit breaker, the power supply side end of the two-pole circuit breaker is provided with three recesses at the top and bottom according to the interval between the three bus bars made of flat conductors. or with each mounting a terminal plug sandwiching the bus bars in two places, by providing the insulating member in the recess is not terminal plug out of the recess, to perform insulation between the recess there is no terminal plug and bus bars by an insulating member Can do.
[Brief description of the drawings]
1A and 1B are diagrams showing the arrangement and connection of bus bars and circuit breakers in a distribution board according to an embodiment of the present invention, where FIG. 1A is a side view, FIG. 1B is a front view, and FIG. FIG.
2 shows the branch circuit breaker in FIG. 2, (A) is a front view, and (B) is a left side view. FIG.
FIG. 3 is a right side view of the branch circuit breaker of FIG.
4 shows a power supply side end of a branch circuit breaker in which a terminal plug is mounted at a position different from that in FIG. 2, (A) is a left side view, and (B) is a right side view.
5 shows a power supply side end of a branch circuit breaker in which a terminal plug is mounted at a different position from FIG. 4, (A) is a left side view, and (B) is a right side view.
6 shows the plug base in FIG. 2, in which (A) is a front view and (B) is a side view. FIG.
7 shows a terminal plug in FIG. 2, in which (A) is a front view and (B) is a side view. FIG.
8 shows the insulating cap in FIG. 2, (A) is a front view, and (B) is a side view. FIG.
FIG. 9 is a side view for explaining a method of attaching the branch circuit breaker in FIG.
FIG. 10 is a side view showing a mounting state of the branch circuit breaker of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mounting base 3 Main circuit breaker 4 Bus bar 5 Bus bar 6 Bus bar 7 Insulation bush 8 Insulation bush 9 Insulation bush 11 Connection conductor 12 Connection conductor 13 Connection conductor 14 Insulation cover 16 Insulation cover 19 Branch circuit breaker 22 Main body case 23 Fixed contact 25 Fixed contact 38 Terminal plug 39 Plug base 40 Recess 41 Lead plate 42 Lead plate 43 Insulation cap

Claims (2)

Consists of a two-pole circuit breaker, and at the power supply side end , three concave and convex portions provided in accordance with the spacing between three flat stacked bus bars, and any of these three concave portions Terminal plugs that have a pair of contact pieces sandwiching the bus bar in each of the two recesses , and that are movably mounted by being loosely inserted into the recesses, and these terminal plugs are connected to a circuit breaker, respectively. A branch circuit breaker comprising a flexible lead plate that is connected to a main plate or a conductive plate holding the main contact and is supported so as to swing up and down within the recess by its own bending. vessel. The branch circuit breaker according to claim 1, wherein one of the three recesses having no terminal plug has a U-shaped insulating member therein .

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