JP2004312837A - Breaker mounting unit and switchboard having breaker mounting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a breaker mounting unit which can constitute, in low height with minimum power conductors, a switchboard which can store a controller capable of controlling many electric path load apparatuses, and a switchboard to which this breaker mounting unit is attached. <P>SOLUTION: The breaker mounting unit 1 is equipped with a base 9, three main branch conductors 11 for three phases in a pair which are attached to the bottom of the base 9, a plug-in type contact 12, a base terminal 3 on power source side which contacts with the power-side terminal 5 of a circuit breaker 2, a sub branch conductor 13 whose one end is connected to the main branch conductor 11 and whose other end is positioned on the surface of the base 9 and to which the base terminal 3 is attached, a base terminal 4 on load side which contacts with the terminal 6 on load side, a terminal board 15 to which the base terminal 4 is attached and which has a terminal screw 14, and an insulating cover 17 which has a slit 17a wherein the power conductor 20 of the switchboard gets in. Two or more circuit breakers 2 can be attached, being arranged side by side right and left. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a circuit breaker mounting unit to which a plurality of circuit breakers can be mounted, and a switchboard to which the unit is mounted.
[0002]
[Prior art]
Some distribution boards, such as a motor control center and a centralized starter panel, have a plurality of circuit control units for controlling circuit load devices such as electric motors arranged for each circuit load device. Such a switchboard is disclosed in Japanese Utility Model Laid-Open No. 02-08245. This switchboard has a plurality of circuit control units arranged in the vertical direction. Each of the circuit control units is connected to a set of three-phase vertically extending strip-shaped power supply conductors provided on the inner side of the switchboard. It has a connected configuration. Such a circuit control unit is provided with a plug terminal on the back surface so that it can be easily removed for maintenance and inspection, and is configured to be plugged into a power supply conductor and connected. This conventional circuit control unit for a switchboard requires a circuit breaker, an electromagnetic switch, an overcurrent relay, and the like for each unit, so that there is a problem that the structure is complicated and the switchboard itself becomes large.
[0003]
[Patent Document 1] Japanese Unexamined Utility Model Publication No. 02-084245
[Problems to be solved by the invention]
In order to solve such a problem, circuit breakers in which the function of an electric circuit control unit is housed in a small housing are disclosed in Japanese Patent Application Laid-Open Nos. 2-136079 and 04-075227. These circuit breakers include a switching contact inside, and include an electromagnet for operating the switching contact, an overcurrent trip device for releasing the switching contact when an overcurrent flows, and the like. Although a switchboard using such a circuit breaker has a simple structure and can be reduced in width, it is necessary to arrange a plurality of circuit breakers one by one from the upper side to the lower side along the power supply conductor. In order to be able to control the load equipment, there has been a problem that the height of the switchboard is increased. In order to limit the height, a plurality of circuit breakers can be arranged in two or three rows in the left-right direction, but in this case, there is a problem that a plurality of sets of power conductors must be prepared. .
Therefore, the present invention provides a circuit breaker mounting unit which can be configured with a minimum number of power supply conductors without increasing the height of a switchboard to which control devices for a large number of circuit load devices can be mounted, and a switchboard mounted with the circuit breaker mounting unit. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an invention according to claim 1 is a device provided on a back surface of a base member and a pair of power supply conductors extending in a vertical direction and capable of being inserted and connected to a pair of power conductors arranged in a horizontal direction. A set of plug-in contacts, a base terminal provided on the surface of a base member connected to terminals of a plurality of circuit breakers arranged side by side in the left-right direction, a set of plug-in contacts and a base terminal To form a breaker mounting unit provided with branch conductors for connecting the circuit breakers. With such a configuration, a plurality of circuit breakers can be arranged in the left-right direction in a space having a height of one circuit breaker with respect to one set of power conductors, so that a low-profile switchboard can be configured.
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, the base terminal is a fixed-side terminal of a plug-in connection type circuit breaker. It can be implemented without doing.
[0007]
The invention according to claim 3 is provided with a power supply conductor extending in the vertical direction at the back, and constitutes a switchboard in which a plurality of circuit breaker mounting units according to claim 1 or 2 are mounted along the power supply conductor. It is possible to provide a low-profile switchboard that can mount a large number of circuit breakers with a small number of power supply conductors.
[0008]
According to a fourth aspect of the present invention, in the switchboard according to the third aspect, the circuit breaker automatically operates when an overcurrent flows in an electromagnet for opening and closing the switching contact of the circuit breaker inside the housing made of an insulating material. Since the overcurrent protection function for opening the switching contact is accommodated, a switchboard capable of controlling a large number of motors can be configured.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to an embodiment shown in FIGS. Referring to FIG. 1, a circuit breaker 2 mounted on a circuit breaker mounting unit 1 of the present embodiment is internally opened and closed as shown in JP-A-2-13679 and JP-A-04-075227. The circuit breaker includes a contact, an electromagnet for operating the switching contact, and an overcurrent tripping device for opening the switching contact when an overcurrent flows. Since these are not main parts, their illustration and description are omitted. Although not disclosed in the above-mentioned publication, the circuit breaker 2 used in the present embodiment is a plug-in connection type, and a power supply side terminal 5 which is inserted into and contacts a base terminal 3 and a base terminal 4 described later. And a load-side terminal 6 on the back surface, and a rotary handle 7 having a function of resetting after the overcurrent trip device operates and a liquid crystal display 8 for displaying a current value flowing through the circuit on the front surface. ing.
[0010]
2 to 4 show a circuit breaker mounting unit 1 according to the present embodiment, in which three circuit breakers used in a three-phase circuit can be mounted. The circuit breaker mounting unit 1 includes a base member including a base 9 made of an insulating material and a cover 10, a set of three main branch conductors 11 for three phases mounted on the bottom of the base member, and a base 9. At the holes 9a provided, the two plug-in contacts 12 respectively attached to the main branch conductor 11 by screws at the holes 9a, and the opposing contacts 12a, 12a of the plug-in contacts are urged toward each other. A spring (not shown), nine power-supply-side base terminals 3 provided on the surface of the base 9 which is in contact with the power-supply-side terminals 5 of the three circuit breakers 2, and one end connected to the main branch conductor 11 by rivets. The other branch conductor 13 having the base terminal 3 attached to the other end, the nine load-side base terminals 4 in contact with the load-side terminals 6 of the three circuit breakers 2, and the base terminal 4 attached by screws. end An insulating cover 17 attached to the rear surface of the base 9 so as to surround the plug-in contact 12 has a slit 17a which switchboard power supply conductor 20 to the terminal plate 15 and will be described later with the screw 14 enters individually. The above-described base terminals 3 and 4 are divided into a plurality of contact pieces 3a and 4a, respectively, from their mounting surfaces toward the tip, and when viewed from the front, the tips of the plurality of contact pieces cooperate to form an annular shape. A spring 16 is formed and biases the tips of the plurality of contact pieces 3a, 4a toward the center of the ring. Therefore, even if the power supply terminal 5 or the load terminal 6 of the circuit breaker 2 is inserted, stable contact can be maintained. The cover 10 is mounted such that the base terminal 3, base terminal 4, terminal plate 15, and terminal screw 14 are exposed on the surface.
[0011]
5 and 6 show a switchboard of an embodiment in which four of the above-described circuit breaker mounting units 1 are vertically arranged. In the interior of the switchboard, three power supply conductors 20 for one set of three phases extending vertically are arranged side by side in the left-right direction when viewed from the front. The power conductor 20 has an L-shaped cross section when viewed from above, one side of which is an attachment side and the other side is a contact side with the plug-in contact 12. The handle 7 and the liquid crystal display 8 are exposed on a panel surface on the surface of the switchboard. The circuit breaker mounting unit 1 is inserted from the surface side of the switchboard to the back so as to widen the distance between the contacts 12a whose opposing interval is smaller than the thickness of the contact side of the power supply conductor 20, and is screwed to the structural member 22 by the screw 21. It can be easily installed simply by fixing it. Further, three circuit breakers 2 are mounted on one circuit breaker mounting unit 1, and the power supply conductor 20, the plug-in contact 12, the main branch conductor 11, the slave branch conductor 13, the base terminal 3, the circuit breaker 2, electric power is supplied to the circuit load device via the base terminal 4, the terminal plate 15, and the electric wire 23 connected to the terminal plate 15. That is, in the case of this switchboard, twelve circuit load devices can be controlled by a total of twelve circuit breakers 2 in three rows in the horizontal direction and four rows in the vertical direction. When performing maintenance and inspection of the plug-in connection type circuit breaker 2, only the circuit breaker 2 to be maintained can be removed from the circuit breaker mounting unit 1 without causing a power outage to an electric circuit load device of another circuit.
[0012]
【The invention's effect】
The present invention is embodied in the above-described embodiment, and includes a pair of plug-in contacts provided on the back surface of a base member that can be connected to a pair of power conductors extending in the vertical direction and arranged in the horizontal direction. A base terminal provided on the surface of the base member connected to the terminals of a plurality of circuit breakers arranged side by side, and a branch conductor connecting the set of plug-in contacts and the base terminal. With a set of power conductors, multiple circuit breakers can be arranged in the horizontal direction in a space that is the height of one circuit breaker in the height direction. It is possible to provide a circuit breaker mounting unit that can be constituted by a power supply conductor and a switchboard to which the circuit breaker mounting unit is mounted.
[Brief description of the drawings]
FIG. 1A is a front view and FIG. 1B is a side view of a circuit breaker that can be mounted on an embodiment of a circuit breaker mounting unit according to the present invention.
FIG. 2 is a front view of a circuit breaker mounting unit according to an embodiment of the present invention, which is partially cut away.
FIG. 3 is a plan view, partly broken away, of an embodiment of the circuit breaker mounting unit according to the present invention.
FIG. 4 is a side view, partly broken away, of an embodiment of the circuit breaker mounting unit according to the present invention.
5 (a) is an external front view and FIG. 5 (b) is an internal side view of a switchboard to which the circuit breaker mounting unit of FIG. 2 is mounted.
FIG. 6 is a plan view showing the inside of the switchboard of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Breaker mounting unit 2 Circuit breaker 3, 4 Base terminal, 3a, 4a Contact piece 5 Power supply terminal 6 Load side terminal 7 Handle 8 Liquid crystal display 9 Base, 9a Hole 10 Cover 11 Main branch conductor 12 Plug-in contact , 12a contactor 13 slave branch conductor 14 terminal screw 15 terminal plate 16 spring 17 insulating cover, 17a slit 20 power supply conductor 21 screw 22 structural member 23 electric wire

Claims (4)

A base member, and a pair of plug-in contacts provided on the back surface of the base member that can be plugged and connected to a pair of power conductors extending in the vertical direction and arranged in the horizontal direction, are arranged side by side in the horizontal direction. A base terminal provided on the surface of the base member connected to terminals of a plurality of circuit breakers, and a branch conductor connecting the set of plug-in contacts and the base terminal are provided. Circuit breaker mounting unit. The circuit breaker mounting unit according to claim 1, wherein the base terminal is a fixed-side terminal of the circuit breaker of a plug-in connection type. A power distribution panel comprising the power supply conductor extending vertically in the back, and a plurality of circuit breaker mounting units according to claim 1 or 2 mounted along the power supply conductor. The circuit breaker has an electromagnet for opening and closing the switching contacts of the circuit breaker inside a housing made of an insulating material and an overcurrent protection function for automatically opening the switching contacts when an overcurrent flows. The switchboard according to claim 3, wherein the switchboard is housed.

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