JPH09147726A - Circuit breaker for distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately perform the work of making connections with circuit breakers by providing primary and secondary side terminals connected to two overcurrent protection terminals or neutral-phase connection points, and spacing the RT- and N-phase primary terminals apart along the cross direction of a case, at the input side end of the case. SOLUTION: Primary side terminals 2, 3 are made to branch from each other inside a case 8 and connected to two overcurrent protection contacts 11, 12 and to two neutral-phase terminals 13, 14. Four secondary side terminals 4 to 7 are individually connected to the secondary side of the contacts 11, 12 and to the secondary side of the contacts 13, 14. Three electrode bars R, N, T are arranged parallel to one another at the center of a distribution board 9, and circuit breakers 1 are arranged on both sides of them. The primary terminal 2 on the N-phase side of each circuit breaker 1 is connected to the N-phase electrode bar N, and the primary terminal 3 on the RT phase side is connected to the electrode bar R or T by branch bars 17, 18. The bars 17, 18 are formed by strip copper plates curved in both directions by the amount of deviation from the height at which they are arranged to the height of the primary side terminal 2 of the circuit breaker 1, and can be installed at a distance from each other along the cross direction of the case 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker or an earth leakage circuit breaker provided in a branch circuit of a distribution board, in which an overcurrent protection contact and a neutral phase contact are provided in one case. The present invention relates to a so-called two-pole type circuit breaker built into the.

[0002]

2. Description of the Related Art A power source drawn into a building is branched in a distribution board and distributed to each section in the building. Normally, the power is drawn to the building by single-phase three-wire, and is branched into single-phase two-wire in the distribution board, and each branch circuit is provided with an overcurrent protector and a branch switch. FIG. 5 schematically shows a conventional structure of such a distribution board, in which the R-phase or the T-phase is arranged on both sides of the three electrode bars R, N, T arranged in the center of the distribution board 9. Single pole type circuit breaker 2 connected to electrode bars R and T
Are arranged side by side, and the auxiliary electrode bar 22 in the direction orthogonal to the electrode bar N of the N (neutral) phase is fixed to the tip of the electrode bar N. ) 23 is connected. The base ends of the three electrode bars R, N and T are fixed to the output side of the main circuit breaker 24.

The three electrode bars R, N, T and the auxiliary electrode bar 22 are made of a slender yokan-shaped or strip-shaped copper material, and the branch bar 17 for connecting these electrode bars and the breaker 21 is also provided. It is a strip-shaped copper material. Each branch bar 17 is fastened to the primary terminal 3 of the circuit breaker 21 and the R-phase or T-phase electrode bar R or T with screws 25 and 26.

The N phase of the primary side power supply is called a neutral phase, and a single phase 100 V is distributed by branching the wiring from the N phase and R phase or the N phase and T phase. When branched from the R phase and the T phase, 200 V of single phase is distributed. A normal single-phase 100-volt branch wiring is formed by a pair of a cable 20 drawn from the R phase or the T phase through a circuit breaker 21 and a cable 19 drawn from the N phase through a manual switch 23. These secondary cables 2
0 and 19 are stranded or single-wire cables having an insulating coating. The circuit breaker 21 and the manual switch 23 are numbered in a fixed order, and the circuit breaker and the manual switch having the same number are paired to pull out a pair of secondary cables.

When an overcurrent flows through the branched secondary side cable, an overcurrent protector of a circuit breaker connected to the cable operates to cut off the circuit. Further, when it is necessary to completely shut off the secondary side circuit for a leakage test or the like, the manual tumbler 15 and the manual switch 23 of the circuit breaker are operated to shut off both ends of the secondary side circuit from the power supply.

In the distribution board having such a conventional structure, since it is necessary to connect the secondary side cable to the circuit breaker 21 and the manual switch 23, a wiring mistake is likely to occur and the manual switch 23 must be arranged. The size of the distribution board is increased by the amount that does not happen. In order to avoid such a problem, there is provided a so-called two-pole type circuit breaker in which an overcurrent protector and a contact (neutral phase contact) of a manual switch are housed in one case and integrated.

An example of such a circuit breaker is disclosed in, for example, Japanese Utility Model Laid-Open No. 7-36343. 2 of this kind
As shown in FIGS. 6 and 7, the pole-type circuit breaker 28 has two terminals 2, 3 and 4, 5 on each of the primary side and the secondary side. Phase or T phase and N phase are connected, and two cables 19 and 20 on the secondary side are connected to the secondary side terminals 4 and 5. Two wires pass through the case 8, one of which is provided with an overcurrent protector having the same structure as the conventional one, and the other of which is provided with a manual neutral phase contact. The contact and the neutral phase contact of the overcurrent protector are of a structure that can be operated individually and a structure that can be operated simultaneously by the tumbler 15 of the overcurrent protector.

The distribution board is used everywhere, and if the circuit breakers built in the distribution board have different shapes and sizes, repairs are troublesome. Therefore, the shape and size of the circuit breaker, the current capacity, etc. are stipulated as an agreement type circuit breaker in the JIS appendix, and the circuit breaker is manufactured in a shape according to this.

Therefore, even with the two-pole type circuit breaker 28 in which two wires are provided in the same case, the width and height of the case cannot be increased. Therefore, two terminals on each of the primary side and the secondary side are arranged in multiple stages (in the height direction of the case) to prevent the width of the case 8 from becoming wide.
When the terminals are arranged in the height direction of the case, the branch bar 17,
18 and the screws 25 that connect the secondary side cables 19 and 20,
Since the operations of 26 and 29 become cramped, for example, as shown in FIGS. 6 and 7, the two terminals 2, 3 (or 4, 5) arranged in the height direction of the case are biased in the width direction of the case. Therefore, a driver can be inserted into the screw of the lower terminal 3 (or 5).

When such a two-pole type circuit breaker is used, it is not necessary to separately provide the manual switch 23 in the distribution board, the distribution board can be downsized, and a pair of secondary side cables can be used. Since it is pulled out from the breaker, wiring mistakes can be prevented.

[0011]

As described above, it is theoretically very effective to use the two-pole type circuit breaker in the distribution board, but actually, the two-pole type circuit breaker is used in the distribution board. When trying to assemble the container 28, it has been found that the following problems occur.

That is, as described above, since the branch bar 17 connected to the primary side of the circuit breaker is a strip-shaped copper material, it is poor in flexibility, and for safety, the two branch bars 17,
18 must be spaced apart by a certain distance or more. Under such conditions, the work of connecting the branch bars 17 and 18 from the R phase or the T phase and the N phase to the primary side terminals 2 and 3 arranged in the height direction in the case of each breaker is performed from the copper plate. It has been found that the bending work of the branch bar becomes complicated, and the insulation distance cannot be taken, so that an insulation coating must be applied, which causes more difficult mounting work than expected.

The present invention has been made on the basis of the discovery of the above-mentioned problems, solves the difficulty in mounting the conventional two-pole type circuit breaker, and connects the branch bar to each circuit breaker. ,
An object of the present invention is to obtain a two-pole type circuit breaker that can be surely performed by the same simple work as the conventional single-pole type circuit breaker.

[0014]

A circuit breaker for a distribution board according to claim 1 has two overcurrent protection contacts 1 in one case 8.
1 and 12 and two neutral phase contacts 13 and 14 are built in each one pair, and these two overcurrent protection contacts 11 and 12 and two neutral phase contacts 13 and Four secondary side terminals 5, 7, 4, 6 respectively connected to each of
And one RT-phase primary side terminal 3 connected to the two overcurrent protection contacts 11 and 12, and two neutral-phase contacts 13 and 14
With one N-phase primary side terminal 2 connected to
The two primary side terminals 3 and 2 of the T phase and the N phase are characterized in that they are arranged on the input side end face of the case 8 so as to be separated from each other in the width direction.

According to a second aspect of the invention, in the circuit breaker for the distribution board according to the first aspect, the two primary side terminals 2 and 3 are arranged at the same height position on the input side end face of the case 8. The four secondary side terminals 4, 5, 6 and 7 are separated from each other in the height direction of the case and are different from each other, each pair being connected to the overcurrent protection contact and the neutral phase contact forming a pair. The members belonging to the pair are arranged on the output side end surface of the case 8 with being separated from each other in the width direction of the case.

[0016]

Since the two overcurrent protection contacts 11 and 12 and the two neutral phase contacts 13 and 14 forming the two sets of branch circuits are built in the same case 8, the width of the case 8 is smaller than that of the conventional case. The width of the circuit breaker can be set to two, and the case 8 having the width of the two circuit breakers is provided with one primary side terminal 3 and one primary side terminal 2 on the RT phase side in the width direction of the case. Since it was placed apart,
Branch bars 17, 18 made of copper strip between the electrode bars R, N, T arranged in the distribution board and the primary side terminals 2, 3 of the circuit breaker.
Wiring work using can be easily done,
The insulation distance between the branch bars 17 and 18 can be made sufficiently wide, and complicated bending work of the copper strips to be the branch bars 17 and 18 is not necessary.

[0017]

2 and 3 show the primary side terminals 2 and 3 and the secondary side terminals 4,5 of the two-pole type circuit breaker 1 of the present invention.
It is a figure showing an example of arrangement of 6 and 7. The case 8 of the two-pole type circuit breaker 1 of the present invention has the width of two cases of the conventional single-pole type circuit breaker, and has two overcurrent protection contacts 11 and 12 and two cases. The neutral phase contacts 13 and 14 are built in (see FIG. 1). That is, 1 of the circuit breaker of the present invention
In this case, the overcurrent protection contacts 11 and 12 and the neutral phase contacts 13 and 14 for two circuits of the branch circuit are built in, so that the secondary side has four terminals 4 of two circuits. 5,
6 and 7 are provided. And 2 for one branch circuit
The two secondary side terminals 4, 5 (or 6, 7) are arranged in a staggered manner in the height direction of the case 8, and the secondary side terminals 4, 5, 6 and 7 for different branch circuits are mutually arranged. Are separated from each other in the width direction of the case 8.

On the other hand, there are only two primary side terminals 2 and 3 shown in FIG. 2, and the two primary side terminals 2 and 3 are arranged on the input side end surface of the case 8 so as to be separated in the width direction. In this case, the height of the primary side terminals 2 and 3 from the case bottom surface is JIS
It is practical to make them the same height according to the dimensions of the annexed agreement type circuit breaker.

The two primary side terminals 2 and 3 are connected to the case 8
And the primary side terminal 3 for the R or T phase is connected to the primary side of the two overcurrent protection contacts 11 and 12 in the case 8, and the primary side terminal 2 for the N phase is in the case 8. It is connected to the primary side of two neutral phase contacts 13, 14.

The above-mentioned two primary side terminals 2, 3 and 4 secondary side terminals 4, 5, 6, 7 and two overcurrent protection contacts 11, 12 and two neutral phase contacts 13 are provided. , 14 are shown in FIG. As shown in the figure, the primary side terminals 2 and 3 are branched in the case 8 and connected to two overcurrent protection contacts 11 and 12 and two neutral phase contacts 13 and 14, respectively. Secondary side terminals 4, 5,
Reference numerals 6 and 7 are individually connected to the secondary sides of the two overcurrent protection contacts 11 and 12 and the secondary sides of the two neutral phase contacts 13 and 14, respectively. The pair of overcurrent protection contacts 11 and the neutral phase contact 13 that form one set of branch circuits are linked by a single tumbler 15 to be opened and closed.
Therefore, two tumblers 15 and 16 for opening and closing each of the two sets of circuits are provided on the upper surface of the case 8.

FIG. 4 schematically shows the internal structure of a distribution board provided with a plurality of the circuit breakers 1 of the present invention having the above-mentioned structure. At the center of the distribution board 9, three electrode bars R, N and T are arranged in parallel.

On both sides of these electrode bars R, N, T,
The circuit breakers 1 are arranged, the primary side terminals (terminals connected to the neutral phase contacts) 2 on the N phase side of each circuit breaker 1 are connected to the electrode bar N of the N phase, and the primary side on the RT phase side. The terminal 3 is connected to the R-phase or T-phase electrode bar R or T by branch bars 17 and 18 made of copper strips, respectively. Branch bars 17, 18
As shown in the figure, is a copper plate that is bent in the plane direction by the deviation of the height of the electrode bar and the height of the primary side terminal of the circuit breaker. do not need. Further, since the primary side terminals 2 and 3 are provided apart from each other in the width direction of the case 8 having the width of two pieces of the conventional product, the electrode bars R, N and T and the primary side terminals 2 and 3 are linearly arranged. Even when the branch bars 17 and 18 are connected to each other, it is possible to easily secure a sufficient insulation distance between the branch bars.

The pair of secondary side terminals 4, 5 and 6, 7 of each circuit breaker 1 are arranged apart from each other in the height direction of the case 8, but the cables 19 and 20 on the secondary side are insulated. Since the flexible cable is provided with the coating, there is no problem in connecting the cable to the secondary side terminal. Of course, when the secondary terminals 4 and 5 and 6 and 7 of each set are arranged in the same position and arranged in two stages, it is impossible to insert a screwdriver into the screw of the lower terminal. As described above, it is preferable that the driver be inserted into the screw of the lower terminal by slightly offsetting it in the width direction or slightly offsetting in the pull-out direction of the cables 19 and 20.

[0024]

According to the above-described circuit breaker of the present invention, the distribution board can be downsized and the wiring error of the secondary side cable can be prevented, as in the case of using the conventional two-pole type circuit breaker. It is possible to avoid it, and it is possible to easily connect the branch bar to the primary side terminal in the distribution board,
Moreover, there is an effect that a sufficient insulation distance between the branch bars can be secured.

[Brief description of the drawings]

FIG. 1 is an internal circuit diagram of a circuit breaker of the present invention.

FIG. 2 is a perspective view showing the arrangement of primary side terminals.

FIG. 3 is a perspective view showing an arrangement of secondary side terminals.

FIG. 4 is a schematic front view of a distribution board using the circuit breaker of the present invention.

FIG. 5 is a schematic front view showing an example of a distribution board having a conventional structure.

FIG. 6 is a front view showing a terminal arrangement of a conventional two-pole type circuit breaker.

FIG. 7 is a rear view showing a terminal arrangement of a conventional two-pole type circuit breaker.

[Explanation of symbols]

 2 Primary side terminal 3 Primary side terminal 4 Secondary side terminal 5 Secondary side terminal 6 Secondary side terminal 7 Secondary side terminal 8 Case 11 Overcurrent protection contact 12 Overcurrent protection contact 13 Neutral phase contact 14 Neutral phase contact

Claims (2)

[Claims] 1. A case (8) having two overcurrent protection contacts (11,12) and two neutral phase contacts (13,14), one each of which is incorporated in a pair. And these two overcurrent protection contacts
(11,12) and two neutral phase contacts (13,14), each with four secondary terminals (5,7,4,6) individually connected and two One RT phase primary side terminal (3) connected to the current protection contact (11,12) and one N phase primary side terminal (3 connected to the two neutral phase contacts (13,14). 2) and, this RT phase and N
A circuit breaker for a distribution board, characterized in that the two primary side terminals (3, 2) with respect to the phase are spaced apart from each other in the width direction on the input side end surface of the case (8). 2. Two primary side terminals (2,3) are arranged at the same height, and four secondary side terminals (4,5,6,7) are paired with an overcurrent protection contact. The pair connected to the neutral phase contact are separated from each other in the height direction of the case, and those belonging to different pairs are separated from each other in the width direction of the case, and are arranged on the output side end surface of the case (8). The circuit breaker for a distribution board according to claim 1, wherein: