JP2021197297A - Molded case circuit breaker - Google Patents

Abstract

To reduce the loss of a contact area between a terminal seat and a crimp terminal and suppress excessive temperature rise.SOLUTION: A molded case circuit breaker 1 includes a base 11 with a mounting portion on which a terminal seat 5 is mounted, and the terminal seat to which an electric wire is connected, a terminal seat fixing screw 61 that is inserted into a terminal seat fixing hole 51 provided in the terminal seat to fix the terminal seat, and a wall portion 15 provided to stand up to the side of the terminal seat, and the wall portion is provided with a notch portion 16 extending in the rising direction, the terminal seat fixing hole is provided such that at least a part thereof is located in a space formed by the notch portion, and the terminal seat fixing screw is inserted into the terminal seat fixing hole from the base side and screwed with the thread of the terminal seat fixing hole to fix the terminal material to the base.SELECTED DRAWING: Figure 2

Description

The present invention relates to a circuit breaker for wiring.

As can be understood from Patent Document 1, the terminal seat is provided with a terminal screw insertion hole for fixing a terminal screw for connecting and fixing an electric wire. The terminal seat may be further provided with a hole in the vicinity of the terminal screw insertion hole. In this case, the base is also provided with a hole at a position corresponding to this. These holes were used to secure the terminal seat to the base. A typical example of the method of fixing the terminal seat to the base of the molded case circuit breaker is screw fixing using a screw.

Japanese Unexamined Patent Publication No. 2019-8927

By the way, the electric wire connected to and fixed to the circuit breaker for wiring is often equipped with a crimp terminal, but the screw hole for fixing the terminal seat to the base is within the connection range between the crimp terminal and the terminal seat. The closer it is, the smaller the contact area between the crimp terminal and the terminal seat. If the contact area between the crimp terminal and the terminal seat becomes small, there is a risk that the temperature of the terminal portion will rise beyond the permissible range.

The inventor of this case tried to solve this problem by diligently examining this point. The problem to be solved by the present invention is to reduce the loss of the contact area between the terminal seat and the crimp terminal and suppress an excessive temperature rise.

In order to solve the above problems, a base equipped with a mounting portion for mounting a terminal seat, a terminal seat to which an electric wire is connected, and a terminal inserted into a terminal seat fixing hole provided in the terminal seat to fix the terminal seat. It is a circuit breaker for wiring provided with a seat fixing screw and a wall portion provided so as to stand up to the side of the terminal seat. The wall portion is provided with a notch extending in the rising direction to fix the terminal seat. The hole is provided so as to be located in a space formed by at least a part of the notch, and the terminal seat fixing screw is inserted into the terminal seat fixing hole from the base side and screwed with the thread of the terminal seat fixing hole. A circuit breaker for wiring with the terminal material fixed to the base.

Further, the terminal seat fixing hole is provided on the outer side in the front-rear direction from the center point of the wire fixing screw hole provided on the terminal seat, and is provided on one side in the left-right direction with respect to the center point of the wire fixing screw hole in one pole. It is preferable to form a terminal seat fixing hole so that the exhaust portion capable of exhausting the arc gas generated at the contact is biased to the other side.

In addition, the wall is provided with a circuit breaker fixing hole for wiring into which fixing parts are inserted to fix the circuit breaker for wiring to the base, and the center point of the terminal seat fixing hole is located in front of and behind the center of the circuit breaker fixing hole for wiring. It is preferable to provide them in different directions and in the left-right direction.

Further, it is preferable that a plurality of poles provided with terminal seats are provided and the exhaust portions are arranged so as to be biased in the same direction at the plurality of poles.

In addition, the base is provided with a screw insertion hole for inserting the terminal seat fixing screw and a nut storage space for storing the nut for fixing the wire fixing screw, and the screw insertion hole and the nut storage space are continuous. Is preferable.

In the present invention, it is possible to reduce the loss of the contact area between the terminal seat and the crimp terminal and suppress an excessive temperature rise.

It is a perspective view of the molded case circuit breaker in embodiment. It is an exploded perspective view of the base of the molded case circuit breaker shown in FIG. It is a figure which shows the positional relationship in the vicinity of the terminal seat fixing hole in an embodiment. FIG. 3 is a diagram with a boundary line. However, the broken line represents the boundary of the space formed by the notch, and the two-dot chain line represents the left and right boundaries with respect to the center point of the electric wire fixing screw hole. It is a side view which looked at the circuit breaker for wiring shown in FIG. 1 from the front side. It is a figure which shows around the front end of the molded case circuit breaker in the VI-VI cross section of FIG. It is a figure which shows the state before arranging the terminal seat in the mounting part around the mounting part of the molded case circuit breaker of embodiment. It is a vertical cross-sectional view of one pole at the left end of FIG.

The embodiment for carrying out the invention is shown below. As can be understood from FIGS. 1 to 4, in the circuit breaker 1 for wiring of the present embodiment, the electric wire is connected to the base 11 provided with the mounting portion 21 on which the terminal seat 5 is mounted. The terminal seat 5 is inserted, the terminal seat fixing screw 61 inserted into the terminal seat fixing hole 51 provided in the terminal seat 5 to fix the terminal seat 5, and the wall portion provided so as to stand up to the side of the terminal seat 5. It is equipped with 15. The wall portion 15 of the wiring breaker 1 is provided with a notch portion 16 extending in the rising direction, and a terminal seat fixing hole 51 is provided so as to be located in a space formed by at least a part of the notch portion 16. The terminal seat fixing screw 61 is inserted into the terminal seat fixing hole 51 from the base 11 side and screwed with the thread of the terminal seat fixing hole 51 to fix the terminal material to the base 11. Therefore, it is possible to reduce the loss of the contact area between the terminal seat 5 and the crimp terminal and suppress an excessive temperature rise.

Here, the vertical, front-back, and left-right directions in the specification will be described. The side on which the handle 19 used for turning on / off the wiring breaker 1 is provided is the upper side. Further, the surface on the opposite side thereof, and the side on which the surface facing the mounting surface such as the distribution board is provided is the lower side. Further, the front-rear direction is a direction in which the terminals of the wiring breaker 1 are located at both ends. In this embodiment, the side on which the fixed contact having the terminal seat 5 and the fixed contact 58 is located is the front side. Further, the direction orthogonal to the vertical direction and the front-back direction is the left-right direction. In the embodiment, a wall portion 15 is provided between the terminal seats 5 arranged side by side. Further, a plurality of wall portions 15 are arranged at intervals in the left-right direction.

Here, the outline of the circuit breaker 1 for wiring of the embodiment will be described. In the circuit breaker 1 for wiring of the embodiment, most of the parts constituting the main function are housed in the base 11. As can be understood from the fact shown in FIG. 2, the base 11 of the embodiment includes a first base portion 12 and a second base portion 13, and is a first base portion that serves as a mounting surface for a distribution board or the like. 12 is combined with the second base portion 13 to which the terminal seat 5 and the like are fixed.

The terminal seat 5 is attached to the mounting portion 21 of the base 11, but in the embodiment, the mounting portion 21 is provided on the second base portion 13. The terminal seat 5 mounted on the mounting portion 21 has a terminal seat fixing screw 61 inserted into the terminal seat fixing hole 51 from the base 11 side (mounting portion 21 side) to form a screw thread of the terminal seat fixing hole 51. It is screwed and fixed to the base 11. More specifically, the terminal seat fixing screw 61 is inserted into the screw insertion hole 24 provided in the base 11 so that the head portion 62 is on the lower side, and the terminal seat fixing screw is inserted from the lower side surface of the terminal seat 5. The terminal seat 5 is fixed to the base 11 by screwing the 61 into the terminal seat fixing hole 51. After screwing the terminal seat fixing screw 61 into the terminal seat fixing hole 51, it is preferable that the tip of the terminal seat fixing screw 61 stays below the upper surface of the terminal seat 5.

Since the terminal seat 5 is a portion for connecting to an electric wire, the terminal seat 5 is provided with an electric wire fixing screw hole 53 into which the electric wire fixing screw 81 used for fixing the electric wire is inserted. In order to provide the terminal seat fixing hole 51 at a position even slightly away from the center point 53c of the electric wire fixing screw hole 53, in the embodiment, the wall portion 15 located next to the terminal seat 5 has a notch extending in the rising direction. The part 16 is provided. Since some space can be secured by providing the notch portion 16, the terminal seat fixing hole 51 can be inserted into this space. From the size of the terminal seat fixing hole 51 and the size of the wall portion 15, in the embodiment, it is assumed that a part of the terminal seat fixing hole 51 is located in the space formed by the notch portion 16, but each size is Depending on the case, the entire terminal seat fixing hole 51 may be located in the space formed by the notch portion 16. Although the cutout portion 16 is formed perpendicular to the terminal seat 5 in the present embodiment, it may be formed so as to be inclined with respect to the terminal seat 5.

In the embodiment, the terminal seat fixing hole 51 is provided on the outer side in the front-rear direction from the center point 53c of the electric wire fixing screw hole 53 provided in the terminal seat 5. This means that in the example shown in each figure, the terminal seat fixing hole 51 is provided on the front side of the center point 53c of the electric wire fixing screw hole 53. When arranging the terminal seat fixing hole 51 on the inner side (the central side of the wiring breaker 1), it may be necessary to extend the terminal seat 5 to the rear side to secure a space, but it may be necessary to secure a space on the outer side. When the terminal seat fixing hole 51 is arranged on the side (front and rear end side of the wiring breaker 1), the terminal seat fixing hole 51 can be provided without extending to the front side more than usual.

Further, as can be understood from FIGS. 2 to 6, a terminal seat fixing hole 51 is formed on one side in the left-right direction with respect to the center point 53c of the electric wire fixing screw hole 53 in one pole, and a contact point is formed. It is preferable to form the exhaust portion 17 capable of exhausting the arc gas generated in the above so as to be biased to the other side. In this case, it is possible to prevent the terminal seat fixing screw 61 from obstructing the passage of the arc gas. Therefore, it is possible to reduce the size while ensuring the exhaust performance. The reason why the exhaust unit 17 is biased to the other side is that, as shown in FIG. 5, the central portion of the exhaust unit 17 in the left-right direction is located on the side opposite to the side where the terminal seat fixing hole 51 is provided. All you need is. Further, the entire exhaust portion 17 may be located on the side opposite to the side where the terminal seat fixing hole 51 is provided. The arc gas generated at a contact such as the fixed contact 58 is discharged from the exhaust unit 17 through the gas exhaust passage 18.

In the embodiment, it is a three-pole wiring circuit breaker 1, and three terminal seats 5 are arranged so as to be lined up on one end side of the wiring circuit breaker 1. At some of these poles, a terminal seat fixing hole 51 is formed on one side in the left-right direction with respect to the center point 53c of the electric wire fixing screw hole 53, and an exhaust portion 17 capable of exhausting arc gas generated at a contact is provided on the other side. However, in the embodiment, such a configuration is adopted in all of the plurality of terminal seats 5 adjacent to each other so as to be arranged in the left-right direction. Further, the exhaust portions 17 adjacent to each other in the left-right direction are arranged so as to be biased in the same direction at all the poles.

It should be noted that the number of poles provided with the terminal seats 5 may be a plurality other than three, and even in this case, only some of them are used in one pole with respect to the center point 53c of the wire fixing screw hole 53. The terminal seat fixing hole 51 may be formed on one side in the left-right direction so that the exhaust portion 17 capable of exhausting the arc gas generated at the contact is biased to the other side, or only some of them are exhausted. The portions 17 may be biased in the same direction at a plurality of poles. If the exhaust portions 17 are arranged so as to be biased in the same direction at a plurality of poles, the distance between the exhaust portions 17 between the poles can be maintained at a certain level or more. Therefore, it is possible to suppress a short circuit between the exhaust portions 17 between the poles.

In the embodiment, the wall portion 15 is provided with a wiring breaker fixing hole 22 into which a fixing component is inserted to fix the wiring breaker 1 to the base 11, and the center point 51c of the terminal seat fixing hole 51 is cut off for wiring. It is provided so as to be different from the central portion 22c of the circuit breaker fixing hole 22 in the front-rear direction and the left-right direction. By doing so, the circumference of the wall portion 15 can be effectively used, and it is not necessary to increase the size of the wiring breaker 1 in order to provide the terminal seat fixing hole 51. Although screws are used as the fixing parts of the embodiment, they may be other than screws.

Further, as can be understood from FIGS. 7 and 8, the base 11 of the embodiment has a nut for accommodating a screw insertion hole 24 for inserting the terminal seat fixing screw 61 and a nut 25 for fixing the electric wire fixing screw 81. A storage space 26 is provided. Further, the screw insertion hole 24 and the nut storage space 26 are connected to form a continuous structure. Therefore, it is possible to suppress the increase in size of the wiring breaker 1.

Although the present invention has been described above by taking an embodiment as an example, the present invention is not limited to the above embodiment and can be various modes. The notch provided in the wall portion does not have to have an arc-shaped cross section, and can be in various forms.

1 Circuit breaker for wiring 5 Terminal seat 11 Base 14 Cover 15 Wall part 16 Notch 21 Mounting part 22 Circuit breaker fixing hole for wiring 24 Screw insertion hole 51 Terminal seat fixing hole 53 Wire fixing screw hole 61 Terminal seat fixing screw

Claims (5)

A base with a mounting part for mounting the terminal seat, a terminal seat to which the electric wire is connected, a terminal seat fixing screw for fixing the terminal seat by inserting it into the terminal seat fixing hole provided in the terminal seat, and a terminal seat. It is a circuit breaker for wiring equipped with a wall part provided so as to stand up to the side of the.
The wall is provided with a notch that extends in the rising direction.
The terminal seat fixing hole is provided so as to be located in a space formed by at least a part of the notch.
A circuit breaker for wiring in which a terminal seat fixing screw is inserted into the terminal seat fixing hole from the base side and screwed with the thread of the terminal seat fixing hole to fix the terminal material to the base. A terminal seat fixing hole is provided on the outer side in the front-rear direction from the center point of the wire fixing screw hole provided on the terminal seat.
A claim in which a terminal seat fixing hole is formed on one side in the left-right direction with respect to the center point of the electric wire fixing screw hole in one pole, and the exhaust portion capable of exhausting the arc gas generated at the contact is biased to the other side. Item 1. The circuit breaker for wiring according to Item 1. The wall is equipped with a wiring breaker fixing hole into which fixing parts are inserted to fix the wiring breaker to the base.
The circuit breaker for wiring according to claim 2, wherein the center point of the terminal seat fixing hole is provided so as to be different from the center of the circuit breaker fixing hole in the front-rear direction and the left-right direction. With multiple poles with terminal seats,
The circuit breaker for wiring according to claim 2 or 3, wherein the exhaust unit is biased in the same direction at a plurality of poles. The base is equipped with a screw insertion hole for inserting the terminal seat fixing screw and a nut storage space for storing the nut for fixing the wire fixing screw.
The circuit breaker for wiring according to any one of claims 1 to 4, wherein the screw insertion hole and the nut storage space are continuous.

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