JPH07240140A - Circuit breaker and distribution board - Google Patents

Abstract

PURPOSE:To provide a circuit breaker and distribution board in which sealing work can be simplified without especially enlarging the dimension. CONSTITUTION:A circuit breaker has a case body 1 having an interrupting mechanism 4 and a terminal base 10, and a terminal base cover 20 for covering the terminal base. The terminal base has a first sealing protruding part 14 on the upper surface, and the terminal base cover has a through-hole 23 extending through the first sealing protruding part and a second sealing protruding part 24. Thus, the sealing work can be easily performed because the circuit breaker is separated from a part to be mounted, and a connecting wire is not present near. Further, since the sealing protruding part is never protruded in the longitudinal direction of the circuit breaker as in a conventional one, not only the dimension of the circuit breaker itself but also the dimension of the part to be mounted can be minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for interrupting an electric circuit to a load side when an overcurrent, a leakage current, an overvoltage or the like occurs, and a distribution board provided with such a circuit breaker.

[0002]

2. Description of the Related Art An electric power consumer receives supply of electric power within a power receiving contract based on a power receiving contract with a power company. Therefore, the capacity of the circuit breaker used for receiving electric power from outside on the electric wiring must be within the power receiving contract with the electric power company, and must not exceed the contracted capacity. Due to such a relationship, the circuit breaker at the above-mentioned location cannot be arbitrarily replaced by a consumer or the like. That is, after connecting the electric wire to the terminal of the circuit breaker, the electric wire connecting portion of the terminal is covered with the terminal block cover, and the terminal block cover is sealed so as not to be removed.

In addition to the above, the terminal block cover can be used when it is necessary to prevent the circuit breaker from being replaced without permission, or when the wire connection is exposed and it is dangerous, although the use location is different from the above. It is being covered and sealed.

Conventionally, such a sealable terminal block cover is available.
As a circuit breaker equipped with the above, for example, the one disclosed in Japanese Utility Model Laid-Open No. 61-60447 is proposed as shown in FIGS. 10 and 11. This is a product in which a front surface side and an upper surface side of the terminal block 101 are covered and sealed with a synthetic resin terminal block cover 100. That is, this is an insertion hole formed on the upper surface of the terminal block 101 with a columnar body 102 protruding on the back surface of the surface covering the upper surface side of the synthetic resin terminal block cover 100.
It is designed to be inserted into 103. Also, the terminal block cover-1
A protrusion 106 is provided on the tip back surface of the hanging piece 105 extending from the lower edge of the front surface of 00 along one of the insulating partition walls 104a and 104b of the terminal block 101, and the protrusion 106 is provided on the front surface of one insulating partition wall 104b. It is adapted to be engaged with the recessed hole 107. Then, projecting walls 108 and 109 facing each other are provided on the front surface of the terminal block cover 100 and the front surface of the other insulating partition 104a, and the sealing wire 112 is provided in the through holes 110 and 111 provided in both projecting walls 108 and 109. It is designed to be inserted.

[0005]

In the above-mentioned conventional device, the terminal block cover can be easily attached and detached, and the projecting wall for sealing can be formed at the same time as the terminal block cover or the breaker body, so that the structure is simple. It will be relatively cheap.

However, in the conventional case, since the sealing projection wall is provided on the front side of the terminal block, when the sealing wire is inserted while the circuit breaker is mounted on the mounting surface, it is close to the mounting surface. However, there is a problem that the insertion work is difficult due to the presence of the connecting electric wire. Further, since the projecting wall projects to the front side, the length of the circuit breaker becomes long, and the length dimension of the place where the circuit breaker such as a distribution board is mounted becomes large. -There is also the problem that the size becomes large.

The present invention has been made to solve such a conventional problem, and a circuit breaker and a circuit breaker which can simplify the work of mounting a sealing wire or the like without making the size of itself and the size of a mounting portion particularly large. It is an object of the present invention to provide a distribution board provided with such a circuit breaker.

[0008]

According to a first aspect of the present invention, there is provided a breaking mechanism, a case body accommodating the breaking mechanism, and a plurality of terminals connected to the breaking mechanism and protruding from the case body. A base that extends laterally from the case body and on which the terminals are arranged, a partition that protrudes upward from the base so as to be interposed between the terminals, and a first sealing that projects upward from the partition. A terminal block having a convex portion and a through hole through which the first sealing convex portion can penetrate and project upward when placed on the terminal block so as to cover the terminal block and face the first sealing convex portion Terminal cover having a second sealing protrusion formed on the upper surface thereof
It is a circuit breaker equipped with.

In the present invention, the shut-off mechanism shuts off the electric circuit when an overcurrent, a leakage current, an overvoltage, a neutral wire open phase in the case of a single-phase three-wire power source, and some of these. It includes any of a combination of these. That is, the present invention can be applied to a circuit breaker, a safety breaker, an earth leakage breaker, a motor breaker, a current limiter and the like.

Further, in the present invention, as a structure for locking the terminal block cover to the terminal block, a locking projection is provided on one side and a locking recess is provided on the other side so as to be detachable by utilizing elastic deformation.
It is possible to use known means such as screwing, and the positions where the locking projections and locking recesses are provided in the case of elastic attachment and detachment can also be designed as appropriate.

Further, in the present invention, the first and second
It is sufficient that the sealing projection of the terminal block cover cannot be removed without cutting the sealing cord body.
Alternatively, insertion holes may be formed in each of the second sealing protrusions, and the sealing cord body may be inserted into these insertion holes.
Alternatively, the first and second sealing convex portions may be provided in parallel, the respective tip portions may be bent in a direction away from each other, and the root portions may be tied with the sealing cord body. (The above also applies to the following inventions.) The invention according to claim 2 is a shutoff mechanism, and a case body accommodating the shutoff mechanism.
A plurality of terminals connected to the breaking mechanism and protruding from the case main body, a base extending laterally from the case main body on which each terminal is arranged, and an intervening terminal upward from the base. A plurality of partition walls protruding in such a manner, a terminal block having a first sealing protrusion projecting upward from one of the partition walls and a hole formed in the upper surface of the other partition wall, and covering the terminal block. Through hole through which the first sealing projection penetrates and can project upward when the terminal sealing is placed on the terminal block, and the second sealing projection formed on the upper surface so as to face the first sealing projection. And a terminal block cover having an engaging protrusion formed on the lower surface so as to be press-fitted into the hole in a stationary state.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the breaking mechanism is a circuit opening / closing mechanism, a mechanism for closing the circuit opening / closing mechanism by operation, and a desired physical state such as current or voltage is It is characterized by having a sensitive mechanism which responds to a predetermined value to open the circuit opening / closing mechanism.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, the upper ends of the first and second sealing projections are located above the upper surface of the case body. It is characterized in that it is formed to a size that is located in the lower part.

According to a fifth aspect of the present invention, there is provided a distribution board body, the circuit breaker according to any one of claims 1 to 3 disposed in the distribution board body, and a circuit breaker in the distribution board body. It is a distribution board equipped with a plurality of safety breakers arranged in a branched manner.

[0015]

According to the present invention, the electric wire is connected to the terminal block of the main body and the terminal block cover is mounted. After mounting, a wire for sealing, for example, is laid over the first sealing protrusion of the terminal block and the second sealing protrusion of the cover. Such a sealing wire mounting operation is easy because it is a part away from the mounting portion and there is no electric wire. Further, since the first and second sealing projections for mounting the sealing wire do not project to the side of the case body, not only the size of the circuit breaker but also the mounting portion of the distribution board, etc. The size of can be reduced.

According to the second aspect of the present invention, when the terminal block cover is mounted on the terminal block, a guide action can be obtained by press-fitting the engaging convex portion into the hole, and the terminal block cover is engaged. It becomes a stop.

The invention according to claim 3 has the same operation as the invention according to claim 1 or 2.

According to a fourth aspect of the present invention, the first and second sealing projections are formed so that their upper ends are lower than the upper surface of the case body. In the case where the switchboard is inserted, the cover of the distribution board does not come into contact with the front protrusion or the projection, and the problem that the entire distribution board must be enlarged can be solved.

The invention described in claim 5 can provide a distribution board which can be miniaturized, as described with respect to the invention described in claim 3.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is the case body. The case body 1 is composed of a base 2 made of a thermosetting resin such as phenol and a cover 3 made of a thermoplastic resin such as heat resistant ABS, and has a shut-off mechanism 4 built therein. There is. An operating tool, which is a part of the breaking mechanism 4 and can be opened / closed by the breaking mechanism 4 by operation, projects from the upper surface 6 of the cover 3. The shutoff mechanism 4 in the present embodiment is, for example, as shown in FIG.
The circuit opening / closing mechanism 7 is provided with an overcurrent detecting means 8-1 and a leakage detecting means 8-2 as a sensitive mechanism for opening / closing the circuit. It should be noted that although details of the structure of the shutoff mechanism 4 are not shown and described, a known one can be appropriately adopted. Further, as the sensitive mechanism, other than the above, for example, a mechanism that operates the circuit opening / closing mechanism in response to an overvoltage, an open phase detection signal, or the like can be appropriately adopted.

Reference numeral 10 denotes a terminal block. In this embodiment, for example, three terminals 11, 11, 11 for single-phase three-wire and the case body are provided.
Base 12 extending from 1 and supporting the terminals 11, 11, 11.
And the insulating partition walls 13, 13 between the terminals 11, 11, 11, respectively.
It is mainly composed of. In this embodiment, the base 12 and the insulating partition walls 13, 13 are integrally formed with the base 2 or the cover 3. Then, one of the insulating partition walls 13, 13 is formed with a first sealing convex portion 14 projecting to the upper surface side, and an insertion hole 15 is formed in this convex portion 14. The convex portion 14 is formed at a position lower than the upper surface 6 so that its upper end does not protrude from the upper surface 6. Further, a step portion is formed in an intermediate portion on the front surface side of the insulating partition walls 13, 13 and locking recesses 16, 16 are formed above the step portion. A hole 17 is provided on the upper surface of the other insulating partition wall 13. The terminal block 10 of this embodiment is for screwing an electric wire (not shown). Therefore, the terminal screw 1 is attached to each terminal 11, 11, 11.
8 ... are provided. A lock terminal may be used as the terminal block to eliminate the terminal screw.

Reference numeral 20 denotes a terminal block cover, which is the terminal block 10
For covering the front and upper surfaces of
It is molded from a thermoplastic resin such as S. In this embodiment, three hanging pieces 21, 21, 21 corresponding to the terminals 11, 11, 11 are provided on the front side.
have. Corresponding to the locking recesses 15 and 15, the locking recesses are provided at the bases between the hanging pieces 21, 21 and 21, respectively.
Locking protrusions 22 and 22 that are locked to 15 and 15 are formed.
Further, a notch as a through hole 23 for penetrating the first sealing convex portion 14 is formed on the upper surface, and a second sealing convex portion 24 is formed adjacent to the through hole 23. An insertion hole 25 is formed in the convex portion 24. The convex portion 24 is formed in such a size that the upper end thereof does not protrude from the upper surface 6 when mounted on the terminal block 10. Further, in this embodiment, the projection 26 is provided on the back surface of the upper surface, and the projection 26 is press-fitted into the hole 17 on the upper surface of the insulating partition 13.

Next, the operation of this embodiment will be described. Terminal block
After connecting an external electric wire (not shown) on the power source side or the load side to each of the terminals 11, 11, 11 of the terminal 10, the terminal block cover 20 is attached to cover the terminal block 10. That is, in this embodiment, the terminal block cover 20 is provided from above the terminal block 10 and the protrusion 28 is formed as a hole.
It is pressed into 17 and the first sealing projection 14 is inserted into the through hole 23 and pressed. As a result, the locking projections 22, 22 are locked in the locking recesses 16, 16 and the mounting of the terminal block cover 20 is completed. When the terminal block cover 20 is removed, the hanging piece is pulled outward to disengage the engaging recesses 16 and 16 from the engaging protrusions 22 and 22, and pushed upward in FIG. When the mounting is completed, the insertion hole 15 of the first sealing projection 14 and the insertion hole 25 of the second sealing projection 24 face each other.
A sealing cord body, for example, a wire is inserted into 15, 25 as in the prior art shown in FIG.

FIG. 6 shows another embodiment. In this embodiment, the description of the same parts as those in the embodiment shown in FIGS. 1 to 5 will be omitted. In this embodiment, the terminal block
The first sealing convex portion 14 ′ of 10 is separated from the wall surface of the cover 3 to form a closed hole as the through hole 23 ′ of the terminal block cover 20, and the hole 17 of the terminal block 10 is omitted. The protrusion 26 of the base cover 20 is omitted. That is, the fitting between the first sealing convex portion 14 'and the through hole 23' is used both as a guide and as a prevention of disengagement. This embodiment has the effect of further simplifying the structure.

7 to 9 show one embodiment of the distribution board. Reference numeral 70 denotes a base body, and the base body 70 has a circuit breaker as a main breaker as shown in FIGS.
71, a plurality of safety breakers 72, ... Are provided. As for the safety breakers 72, ..., Only the operation part is shown and the main body is not shown. 73 is a cover,
The circuit breaker 71 has a window hole 74 for exposing the upper surface 6 from which the opening / closing operation tool projects, and is provided on the base body 70 so as to be openable / closable. As such an opening / closing mechanism, a known one such as an engaging means for locking one end side of the cover 73 to the base body 70 and elastically engaging the other end side of the cover 73 with the base body 70 is appropriately used. It can be adopted. The cover 73 further has window holes 75, ... For exposing the upper surfaces of the safety breakers 72, ...

According to the distribution board of this embodiment, since the upper ends of the first and second sealing projections of the circuit breaker 71 are located lower than the upper surface of the case body, the cover 73 is used. The first when covering
Also, the second sealing protrusion does not interfere, and therefore the distribution board as a whole can be made thin and the height of projection from the wall surface can be reduced. For this reason, it is less intrusive to the user and has a clean appearance.

[0027]

As described above, according to the first aspect of the invention, the terminal block is provided with the first sealing projection, and the through hole and the second sealing projection are provided on the upper surface of the terminal block cover. Since the sealing cord is supported by the first and second sealing protrusions, the sealing cord is separated from the attached portion at the time of mounting the sealing cord, and the connecting electric wire is close to it. Since it does not exist, work can be performed easily. Further, unlike the conventional one, since the mounting member of the sealing cord does not project in the longitudinal direction of the circuit breaker, not only the size of the circuit breaker itself but also the size of the mounted portion can be reduced.

According to the second aspect of the present invention, the terminal block cover can be easily attached to the terminal block, and the locking structure and work can be simplified.

The invention according to claim 3 has the same effect as the invention according to claim 1 or 2.

The invention according to claim 4 is the first and second aspects.
Since the height of the sealing projection of the circuit breaker was set lower than the top surface of the mechanism for opening and closing the circuit breaker main body, when the circuit breaker was installed in the distribution board, the cover of the distribution board was The entire distribution board can be miniaturized without coming into contact with the protrusion.

According to the invention described in claim 5, the distribution board can be downsized similarly to the invention described in claim 4.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a state where the terminal block cover of the embodiment is removed.

FIG. 3 is a rear view of the terminal block cover of the embodiment.

FIG. 4 is a cross-sectional view taken along the line A-A ′ in FIG.

FIG. 5 is a circuit diagram showing a breaking mechanism in the embodiment.

FIG. 6 is a partially cutaway exploded perspective view showing another embodiment of the present invention.

FIG. 7 is a simplified plan view of an embodiment of a distribution board.

FIG. 8 is a simplified partial sectional front view of the same.

FIG. 9 is a simplified partial cross-sectional side view of the same.

FIG. 10 is a partially cutaway perspective view showing a conventional technique.

FIG. 11 is an exploded perspective view of a cutaway portion of the same portion.

[Explanation of symbols]

1 ... Case main body, 4 ... Shutoff mechanism, 10 ... Terminal block, 14 ... First sealing projection, 20 ... Terminal block cover, 23 ... Through hole, 24 ... Second
Sealing convex portion, 70 ... Base, 73 ... Cover.

Claims (5)

[Claims] 1. A breaking mechanism; a case body accommodating the breaking mechanism; a plurality of terminals connected to the breaking mechanism and projecting from the case body; and extending laterally from the case body. A base on which the terminals are disposed, a terminal block having a partition wall projecting upward from the base plate so as to be interposed between the terminals, and a first sealing projection projecting upward from the partition wall; and covering the terminal block. The second sealing projection formed on the upper surface so as to face the through hole through which the first sealing projection penetrates and can project upward when placed on the terminal block as described above, and the first sealing projection. And a terminal block cover having a portion; 2. A breaking mechanism; a case body accommodating the breaking mechanism; a plurality of terminals connected to the breaking mechanism and projecting from the case body; extending laterally from the case body. A base on which each terminal is arranged, a plurality of partition walls protruding upward from the base so as to be interposed between the terminals, a first sealing convex portion protruding upward from one of the partition walls, and A terminal block having a hole formed on the upper surface of another partition; a through hole through which the first sealing projection can penetrate and project upward when the terminal block is placed on the terminal block so as to cover the terminal block; A terminal block cover having a second sealing convex portion formed on the upper surface so as to face the sealing convex portion and an engaging convex portion formed on the lower surface so as to be press-fitted into the hole in the stationary state; A circuit breaker characterized by being provided. 3. The circuit breaking mechanism opens the circuit opening / closing mechanism in response to a desired physical condition such as a circuit opening / closing mechanism, a circuit closing mechanism for closing the circuit opening / closing mechanism by operation, or a current, voltage, or the like. The circuit breaker according to claim 1 or 2, further comprising a sensitive mechanism. 4. The first and second sealing projections are dimensioned so that their upper ends are located lower than the upper surface of the case body. The circuit breaker according to any one of 1 to 3. 5. A distribution board main body; a circuit breaker according to any one of claims 1 to 3, which is arranged in the distribution board main body; and a branching device arranged in the distribution board main body. A distribution board characterized by comprising a plurality of safety breakers provided.