JP4719064B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a multipolar circuit breaker having a plurality of voltage electrode contacts.

2. Description of the Related Art Conventionally, a circuit breaker has been provided in which a circuit breaker unit having one to a plurality of poles is housed inside a container (see, for example, Patent Document 1). As shown in FIG. 4, this circuit breaker includes a body 100 including a body 101 having two opposite surfaces opened, and a first cover 102 and a second cover 103 that are attached so as to close the respective opening surfaces. And a voltage electrode housed between the first cover 102 and the body 101 and a ground electrode housed between the second cover 103 and the body 101. The voltage electrode and the ground electrode are input terminals 105 and 106 and output terminals (only input terminals in the figure) that are electrically connected to wiring members such as electric wires and bus bars, respectively, and the input terminals 105 and 106 and output terminals of each electrode. And a contact portion (not shown) that is electrically connected to each other. These contact portions are opened and closed in conjunction with the opening and closing operation of the handle 104 protruding from the inside of the body 100 through the handle insertion hole 104a penetrating the upper surface in FIG. 4 of the abutting portion of the first cover 102 and the body 100. To do. Also, a release device (not shown) is provided for forcibly opening both the contact portions on the voltage electrode side and the ground electrode side when an abnormal current due to electric leakage or the like is detected.
Two connecting holes 107 into which wiring members are inserted are respectively provided on both the left and right side surfaces of the vessel body 100 (only the left side surface in the figure), and the input terminals of the respective poles are provided inside the connecting holes 107. Terminal plates (not shown) that are electrically connected to 105 and 106 and the output terminal are provided. A screw operation hole 108 is formed through each of the upper surfaces of the abutting portions of the body 101 and the first cover 102 and the abutting portions of the body 101 and the second cover 103 so as to face the connection holes 107. Is provided with an operation screw (not shown). By rotating the head of the operation screw with the tip of the driver or the like, a terminal fitting (not shown) through which the operation screw is inserted can be moved in the vertical direction. The wiring member is connected to the terminals of each pole by inserting the wiring member into the connection hole 107 and rotating the operation screw so that the wiring member is sandwiched between the terminal fitting and the terminal plate.
JP-A-8-138512

  However, in the above-described conventional example, an external force is applied in a direction in which the butted portion of the body 101 and the first cover 102 and the butted portion of the body 101 and the second cover 103 are opened, and the screw operation hole 108 is larger than a size that allows the fingertip of the hand to enter. If it spreads over, there is a problem that the fingertip of the hand may accidentally come into contact with the operation screw as the charging unit.

  The present invention has been made in view of the above points, and an object thereof is to provide a circuit breaker in which a fingertip of a hand does not come into contact with an operation screw even when a gap is generated between a body and a cover.

  In order to achieve the above object, the first aspect of the present invention is to connect the body having an opening on one side and the opening of the cover to each other and the wiring member housed in the body and externally connected. Input and output terminals having one or more poles, and one or more contact parts that are housed inside the container and are electrically connected between the input terminals and the output terminals of each pole. Both the terminal and the output terminal include a terminal plate electrically connected to the contact portion, a terminal fitting for electrically connecting the terminal plate and the wiring member by sandwiching the wiring member between the terminal plate, and a terminal It consists of an operation screw inserted into one surface of the metal fitting, and the terminal metal plate is connected to the terminal plate by rotating the operation screw with a tool from the screw operation hole provided in the butting surface of the body and cover so as to face the one surface of the terminal metal fitting. And the position where it contacts the terminal board An insulating member having an insertion hole formed with a diameter that does not allow a fingertip of a hand to enter is disposed between the opening of the screw operation hole and the operation screw. It is characterized by that.

  According to a second aspect of the present invention, in the first aspect of the invention, the insulating member is formed so that the insertion hole has the same diameter as the screw operation hole, and the central axis of the screw operation hole coincides with the central axis of the insertion hole. It is arranged.

  According to the first aspect of the present invention, since the insulating member having the insertion hole formed with a diameter that does not fit the fingertip of the hand is disposed between the opening of the screw operation hole and the operation screw, Even if a gap is created between the body and the cover and the screw operation hole expands beyond the size of the fingertip of the hand, the insulating member prevents the fingertip of the hand from accidentally coming into contact with the operation screw that is the live part. Can do.

  According to the invention of claim 2, the insulating member is formed so that the insertion hole has the same diameter as the screw operation hole, and the central axis of the screw operation hole and the central axis of the insertion hole coincide with each other. When the tool is inserted from the screw operation hole into the insertion hole, it is possible to prevent the tip of the tool from hitting the insulating member, so that the operation screw can be easily tightened or loosened by the tool.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the upper, lower, left, and right directions in FIG.
This embodiment is a circuit breaker with so-called single-phase three-wire neutral wire phase loss protection, which includes three voltage electrodes and a ground electrode, and the upper surface of the container 1 is opened as shown in FIG. A body 10 in which a first storage part (not shown) and a second storage part (not shown) having an open front are arranged in the front-rear direction, and the body 10 is closed so as to close the opening of the first storage part. The upper cover 12 is attached, and the front cover 11 is attached to the body 10 so as to close the opening of the second storage portion.
Although not shown, the first storage portion is formed with three storage chambers arranged in the front-rear direction by partitioning the interior with a plurality of partition walls, and each storage chamber has a voltage electrode side at both ends in the left-right direction. The input terminal and the output terminal are housed, and the contact portion on the voltage electrode side is electrically connected between the input terminal and the output terminal of each pole. In addition, the first storage portion opens and closes each contact portion in conjunction with an opening / closing operation of the handle 4 protruding from the inside of the container body 1 through a handle insertion hole 14 penetrating substantially at the center of the upper surface of the upper cover 12. In addition, an opening / closing / trip device (not shown) is housed for forcibly opening each contact portion when an abnormal current flows through any of the contact portions.
On the other hand, the second storage part includes an input terminal 2a and an output terminal 2b (see FIG. 1A) on the ground electrode side, a contact part (not shown) electrically connected between both terminals, An earth leakage breaker mechanism (not shown) is housed that operates the switching / trip device and forcibly opens the contact portions on the voltage electrode side and the ground electrode side when an abnormal current is detected. In addition, since operation | movement of the above-mentioned switching / trip apparatus, the earth-leakage interruption | blocking mechanism, and a circuit breaker is known, detailed description is abbreviate | omitted here.
As shown in FIG. 2, four connection holes 13 for inserting wiring members are respectively provided in the left and right side surfaces of the body 10 (only the left side surface in the drawing). Screw operation holes 23 and 24 in which operation screws 22 (to be described later) are respectively disposed are passed through the upper surfaces of the body 10, the upper cover 12, and the front cover 11. In addition, the connection hole 13 and the screw operation hole 23 provided in the abutting part of the body 10 and the front cover 11 are for the ground electrode, and the remaining connection hole 13 and the screw operation hole 24 are for the voltage electrode.
In the present embodiment, as shown in FIG. 1 (a), in the input terminal 2a and the output terminal 2b on the grounding pole side provided at the abutting portion between the body 10 and the front cover 11, the opening of the screw operation hole 23 It is characterized in that the insulating member 3 is disposed between the head of the operation screw 22. Accordingly, only the input terminal 2a and the output terminal 2b on the ground electrode side will be described below, and the description of the input terminal and the output terminal on the voltage electrode side will be omitted. The configuration of the input terminal and output terminal on the voltage electrode side is the same as that of the input terminal 2a and output terminal 2b on the ground electrode side except that the insulating member 3 is not provided.
The input terminal 2a and the output terminal 2b are each composed of a terminal metal fitting 20 formed by bending a conductive metal plate to have a substantially rectangular cross section, an operation screw 22 inserted through an upper piece of the terminal metal piece 20, and an operation screw 22 Terminal plates 21a and 21b that are in contact with the lower ends of the terminals. Each terminal fitting 20 is accommodated so as to be movable up and down in terminal accommodating chambers 15a and 15b having a horizontal cross section formed in the container body 1. That is, the terminal storage chambers 15a and 15b are larger in height than the terminal fitting 20, and the terminal fitting 20 is prevented from rotating by the terminal storage chambers 15a and 15b and can move only in the vertical direction. In addition, screw operation holes 23 having diameters that do not allow the heads of the operation screws 22 to pass through are formed in the upper walls of the terminal storage chambers 15a and 15b, that is, the abutting portions of the body 10 and the front cover 11. ing. Thus, when the tip of the driver is inserted into the screw operation hole 23 and the operation screw 22 is rotated, the terminal fitting 20 moves up and down in accordance with the rotation direction of the operation screw 22. The distance between the lower piece and the terminal plates 21a and 21b can be changed. That is, the wires and bus bars are connected through the connection holes 13 (see FIG. 2) penetrating the left and right sides of the body 10 corresponding to the portions between the lower walls of the terminal storage chambers 15a and 15b and the terminal plates 21a and 21b. After the wiring member is inserted, the operation screw 22 is rotated to bring the lower piece of the terminal fitting 20 closer to the terminal plates 21a and 21b, so that the wiring member is connected to the lower piece of the terminal fitting 20 and the terminal plates 21a and 21b. The wiring member is electrically connected to the wiring member.
As shown in FIG. 1B, the insulating member 3 is formed in a substantially rectangular shape from an insulating material, and an insertion hole 3a is provided in the center in the thickness direction. The diameter of the insertion hole 3a may be a size that does not allow the fingertip of the hand to enter. In the present embodiment, the diameter is the same as the diameter of the screw operation hole 23. The insulating member 3 includes the body 10 and the front cover 11 so that the central axis of the insertion hole 3 a and the central axis of the screw operation hole 23 coincide between the opening of the screw operation hole 23 and the head of the operation screw 22. It is embedded and arranged across the.
As described above, the insulating member 3 having the insertion hole 3a formed with a diameter that does not allow the fingertip of the hand to enter is disposed between the head of the operation screw 22 and the opening of the screw operation hole 23. As shown in FIG. 3, even when an external force is applied to the abutting portion of the body 10 and the front cover 11 and the screw operation hole 23 is expanded to a size that allows the fingertip of the hand to be inserted, the insulating member 3 is Therefore, it is possible to prevent the fingertip of the hand from accidentally contacting the head of the operation screw 22. Further, since the diameter of the insertion hole 23 is formed to be the same as the diameter of the screw operation hole 23 and is arranged so that the respective central axes coincide with each other, the operation screw 22 is not caught by the insulating member 3. Can be tightened.

It is a figure which shows the circuit breaker of embodiment of this invention, (a) is the fragmentary sectional view which looked at the butting | matching part of a body and a front cover from the front side, (b) is an expansion perspective view of an insulating member. It is a whole perspective view same as the above. It is a top view which shows the case where a clearance gap is produced in the butted part of the body and front cover same as the above. It is a whole perspective view which shows the conventional circuit breaker.

Explanation of symbols

1 Body 10 Body 11 Front cover 2a Input terminal (grounding pole side)
2b Output terminal (grounding pole side)
20 Terminal metal fittings 21a, 21b Terminal plate 22 Operation screw 23 Screw operation hole 3 Insulating member

Claims (2)

  A body formed by abutting the opening surfaces of the body and cover that are open on one side, one or more input terminals and output terminals that are housed inside the body and connected to wiring members from the outside, and the body It has one or more contact points that are housed inside and electrically connected between the input terminal and output terminal of each pole, and both the input terminal and the output terminal are electrically connected to the contact part. A terminal plate, a terminal fitting for electrically connecting the terminal plate and the wiring member by sandwiching the wiring member between the terminal plate, and an operation screw inserted into one surface of the terminal fitting. The terminal fitting is moved between a position where it abuts against the terminal plate and a position where the terminal plate is separated from the terminal plate by rotating the operating screw with a tool from the screw operating hole provided in the butting surface of the body and the cover. It ’s something that makes you Circuit breaker being characterized in that disposed between the insulating member previously has a size insertion hole formed in the diameter of which does not enter the opening of the screw operation hole and the actuating screw. 2. The insulating member according to claim 1, wherein the insertion hole is formed with the same diameter as the screw operation hole, and the central axis of the screw operation hole is aligned with the central axis of the insertion hole. Circuit breaker as described.

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