JPH0730438U - Circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the shortage of terminal mounting strength and to secure a sufficient insulation distance without increasing the overall width of the circuit breaker case by making the thickness of the side wall and partition wall of the terminal connection part sufficient. It is to provide a highly versatile circuit breaker capable of performing the following. [Structure] The circuit breaker case 1 has both side walls 6 and 6 and a partition wall 6.
In a circuit breaker in which a plurality of terminal connecting portions 3a and 3b partitioned by a are disposed, adjacent terminal connecting portions 3a and 3b
b are arranged in different stages, and the partition wall 6a is offset from the vertical center line of the adjacent terminal connecting portions 3a, 3b and bulges above the lower terminal connecting portion 3b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-pole circuit breaker.

[0002]

[Prior art]

 Conventionally, in order to measure the insulation resistance of the branch circuit of the distribution board, a neutral switch for opening and closing the neutral line is provided separately from the circuit breaker for breaking the voltage line. Since the neutral switch of the neutral line and the circuit breaker of the voltage line must be checked, the wiring work is troublesome, and when measuring the insulation resistance of the branch circuit, the neutral switch of the neutral line and the voltage line of the pair It was necessary to check and break the circuit breaker, and the work of measuring the insulation resistance was troublesome. Therefore, a circuit breaker in which a mechanism for breaking the neutral line is incorporated in a single-pole circuit breaker for breaking the voltage line has also been proposed. A conventional circuit breaker of this type is shown in FIG. Thus, the neutral wire connection terminal 14 of the neutral wire and the voltage wire connection terminal 15 of the voltage wire are arranged in parallel with the terminal connection portion 13 of the circuit breaker case 11, or in Japanese Patent Application No. 5-39798. As the circuit breaker shown in FIG. 4 previously filed by the applicant of the present application, the neutral wire connecting terminal 14 and the voltage wire connecting terminal 15 are arranged above and below the terminal connecting portion 13 of the circuit breaker case 11. It was set up.

However, if the voltage line connection terminal 15 and the neutral line connection terminal 14 are arranged in parallel in the terminal connection portion 13 of the circuit breaker case 11 as shown in FIG. 3, the insulation distance between the terminals will be sufficient. In order to secure the partition wall 16a having a sufficient thickness, the overall width becomes large, and a compact design cannot be achieved. On the other hand, if the partition wall 16a having a thickness that can secure a sufficient insulating distance without increasing the overall width is attempted. Therefore, the thickness of the side walls 16 of the terminal connecting portion 13 is reduced by that much, and it is necessary to change the material of the circuit breaker case 11 and reinforce the terminal connecting portion 13.

Further, when the voltage line connection terminal 15 and the neutral line connection terminal 14 are arranged above and below the terminal connection portion 13 of the circuit breaker case 11 as shown in FIG. 4, the lower neutral line connection is connected. It is impossible to screw the conductive bar 17 connected to the terminal 14, and the neutral wire connection terminal 14 is used as an outlet type, and the plug-type conductive bar 17 is inserted into the outlet type connection terminal for connection. For this reason, if the dimensional accuracy of the contact part of each connection terminal is low, it may cause poor contact with the conductive bar 17, and the gap of the outlet part must be changed according to the thickness of the conductive bar 17. Therefore, there was a problem that the versatility was poor and the cost increased.

[0005]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to solve the above-mentioned problems and to make the thickness of the partition wall and the side wall of the terminal connection part sufficient without increasing the overall width of the circuit breaker case and to improve the terminal mounting strength and insulation distance. It is to provide a highly versatile circuit breaker capable of sufficiently securing

[0006]

[Means for Solving the Problems]

 The circuit breaker of the present invention, which has solved the above-mentioned problems, is a circuit breaker in which a plurality of terminal connecting portions partitioned by both side walls and partition walls are arranged in a circuit breaker case. And the partition walls are arranged above and below each other, and the partition walls are offset from the vertical centerlines of the adjacent terminal connecting portions and bulge above the lower terminal connecting portions.

[0007]

[Action]

 Such a circuit breaker constitutes a branch circuit by connecting the main bus for laying on the distribution board to each connection terminal in the terminal connection section partitioned and formed in the circuit breaker case with a conductive bar for branching. However, the adjacent terminal connection parts are arranged in different levels, and the partition walls are offset from the vertical center line of the adjacent terminal connection parts and bulge above the lower terminal connection parts. By doing so, the thickness of the side walls and partition walls can be secured without increasing the overall width, so that the side walls can be securely fixed to each terminal without being cracked or damaged when the terminals are mounted. In addition, a sufficient insulation distance can be secured between the terminals, and stable operation can be guaranteed.

[0008]

【Example】

 Next, the present invention will be described in detail based on the embodiment of FIG. Reference numeral 1 denotes a circuit breaker case made of hard synthetic resin, and a single pole circuit breaker 2 is incorporated in the circuit breaker case 1. This single-pole circuit breaker 2 opens and closes the voltage line and the neutral line during normal opening and closing operations, and interrupts the voltage line when overcurrent, etc. flows in, and the neutral line along with the breaking operation on the voltage line side. The opening of the neutral wire is necessary when measuring the insulation resistance of the branch circuit.

Reference numerals 3 a and 3 b denote two-pole terminal connecting portions formed in the base end portion of the circuit breaker case 1 in a vertically-different manner, and the upper terminal connecting portion 3 a is one side upper half portion of the base end portion. In addition, the lower terminal connection portion 3b is recessed in the form of a compartment from the lower portion on the other side of the base body to the upper end, and is provided between both side walls 6 and 6 which are outer walls of the terminal connection portions 3a and 3b. A partition 6a is provided upright to partition the upper portion of the lower terminal connecting portion 3b from the upper terminal connecting portion 3a. The lower terminal connecting portion 3b is provided with a neutral wire connecting terminal 5, and the upper terminal connecting portion 3a is provided with a voltage wire connecting terminal 4. The partition wall 6a is offset from the vertical centerlines of the two terminal connection parts 3a, 3b and bulges above the lower terminal connection part 3b, so that the partition wall 6a has a sufficient thickness to have a required strength. Since the neutral wire connection terminal 5 is located below and adjacent to the voltage line connection terminal 4, the partition wall 6a does not narrow the terminal connection portion 3a, and the thickness of the partition wall 6a is not increased. The compact design is designed so that the necessary strength can be obtained by making the thickness sufficiently thick, and the total width does not become large even if the insulation distance is sufficiently secured.

[0010] The thus-configured one has the neutral busbar and the voltage busbar, which are laid on the distribution board, as in the conventional circuit breaker of this kind, and are connected to the two-pole terminal connecting portions 3a and 3b. A branching circuit is constructed by screwing and connecting a conductive bar, an electric wire, etc. for branching to a certain voltage wire connection terminal 4 and neutral wire connection terminal 5, and at the time of this screwing, voltage line connection is made. Even if part of the tightening force applied to the terminal 4 and the neutral wire connection terminal 5 is received by the side walls 6 and 6 and the partition wall 6a, the two-pole terminal connection parts 3a and 3b are arranged in different levels. The side walls 6 and 6 and the partition wall 6a are provided by arranging the partition walls 6a and bulging them above the vertical terminal lines of the adjacent terminal connecting parts 3a and 3b to the upper part of the lower terminal connecting part 3b. Can be thick enough to withstand the mounting force of each connection terminal. Therefore, the side walls 6 and 6 and the partition wall 6a are not cracked or damaged, and the voltage busbar and the neutral busbar are securely fixed to the voltage wire connection terminal 4 and the neutral wire connection terminal 5. Become.

Moreover, since the voltage line connecting terminal 4 and the neutral line connecting terminal 5 are located in the terminal connecting portions 3a and 3b which are arranged in different levels, the voltage line connecting terminal 4 and the neutral line connecting terminal 5 are arranged. A sufficient insulation distance is secured between the terminals and there will be no trouble due to poor insulation between terminals. When measuring the insulation resistance of the branch circuit formed on the distribution board, turn off the single-pole circuit breaker 2, turn off the voltage line and neutral line at the same time, and measure the insulation resistance of the branch circuit. In addition, if an abnormal current flows in the branch circuit, the single-pole circuit breaker 2 will break the voltage line.

In another embodiment shown in FIG. 2, the upper portion of the outer side wall 6 of the lower terminal connecting portion 3b of the circuit breaker case 1 is formed as a cut-out missing portion 7 of the side wall 6. This is to improve the workability of inserting and mounting the mounting screw when connecting the conductive bar to the sex wire connecting terminal 5, and thus the upper part of the outer side wall 6 of the lower terminal connecting part 3b is missing. If the part 7 is provided, the insulation distance will be shortened, but since the circuit breaker case 1 has the voltage line connection terminal 4 and the neutral line connection terminal 5 arranged in different stages, a plurality of circuit breakers are used in parallel. Then, since the missing portion 7 is shielded by the side wall having no missing portion of the other adjacent circuit breaker, the insulation distance does not become insufficient. Since the structure is the same as that of the embodiment shown in FIG. 1 except the above-mentioned missing portion 7, the same reference numerals are given and the description thereof will be omitted. Further, although the above embodiment has been described only with a two-pole circuit breaker, the present invention is not limited to this, and it is of course applicable to all multi-pole circuit breakers.

[0013]

As is apparent from the above description, the present invention provides a circuit breaker in which a plurality of terminal connecting portions partitioned by side walls and partition walls are arranged in a circuit breaker case, and adjacent terminal connections are provided. In addition to arranging the parts in different vertical positions, the partition walls are offset from the vertical center line of the adjacent terminal connection parts and bulged above the terminal connection parts in the lower part, so that the terminal connection can be made without expanding the overall width. The partition walls and side walls between the parts can be made sufficiently thick to secure the required strength, and it is not necessary to change or reinforce the material of the circuit breaker case, which can suppress the cost increase. A compact design is possible. However, since a sufficient insulation distance can be secured, stable operation can be maintained for a long period of time, and since the connection can be made with mounting screws, it is not necessary to make the connection terminal into an outlet type. The circuit breaker is highly versatile and inexpensive because it does not cause contact failure due to dimensional accuracy and does not require changing the gap size of the outlet according to the thickness of the conductive bar. Can be provided. Therefore, the present invention is of great practical value as a circuit breaker that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional circuit breaker.

FIG. 4 is a perspective view showing another example of a conventional circuit breaker.

[Explanation of symbols]

 1 Circuit breaker case 2 Single pole circuit breaker 3a Terminal connection part 3b Terminal connection part 6 Side wall 6a Partition wall 7 Missing part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Akihisa Kuwahara 1-2-23 Ikenohata, Taito-ku, Tokyo Inside Nippon Electric Construction Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A circuit breaker in which a plurality of terminal connecting portions partitioned by both side walls and a partition wall are arranged in a circuit breaker case, wherein adjacent terminal connecting portions are arranged in a vertically staggered manner. The circuit breaker is characterized in that the partition wall is offset from the vertical center line of the adjacent terminal connection portion and bulges above the lower terminal connection portion. 2. The circuit breaker according to claim 1, wherein the upper portion of the side wall of the lower terminal connection portion is a missing portion.