JP6209725B2 - Earth leakage breaker - Google Patents

Description

  The present invention relates to a test button misoperation prevention cover for an earth leakage breaker disposed on a switchboard or the like, and an earth leakage breaker using the same. More specifically, the present invention relates to a technique for preventing a person from erroneously operating a test button provided in an earth leakage breaker.

  In general, as shown in Fig. 5, A: a power supply that cannot be temporarily disconnected, such as an alarm, etc., and no mark: a general power supply that is obliged to perform an annual leakage test. Further, three types of B: constant voltage constant frequency device power supply (constant voltage constant frequency, hereinafter referred to as CVCF power supply) are provided.

  In order to make the switchboard more compact and clarify the relevance of the wiring of the three types of power supplies, this switchboard puts three types of power supplies together, and emphasizes the relevance of the wiring system rather than the type of power supply. It was common to have an arrangement.

  For this reason, when performing a leakage test of a leakage breaker for a general power supply that is obliged to perform a leakage test once a year, a power supply that cannot be temporarily disconnected, such as an alarm, or the like Therefore, it was necessary to devise a way to prevent disconnection of the earth leakage circuit breaker of the CVCF power supply by mistaken operation (incorrect operation of the earth leakage test button). Conventionally, there has been only a display that calls attention by a method (Patent Document 1) such as covering the whole or a part of the earth leakage breaker with an acrylic cover or a display label. Moreover, when the arrangement of the earth leakage breakers in the switchboard is dense, a phenomenon in which an acrylic cover cannot be attached has also occurred.

  However, by any of these methods, it is not possible to operate a human error completely, or a structure that cannot be operated erroneously (a structure in which a test button cannot be operated unless a dedicated tool is used) is not used. As a result, the test button of the earth leakage circuit breaker related to the power supply that cannot be temporarily disconnected, such as the accidental operation, may have been mistakenly operated, and the influence on the entire system at that time will be large, and it is very difficult to recover after that. It was something.

On the other hand, when looking at the earth leakage breakers installed in the home and used in the industry, as shown in Fig. 6a) and b), from the earth leakage breaker, the test button can be operated easily. The buttons were designed to pop out, and the structure was not designed to prevent the power from being cut off due to an incorrect operation. (Non-Patent Documents 1 and 2)
Here, the terminal cover relevant to the present invention will be described with reference to FIG. Fig. 7 shows the outline of the terminal cover of the 3-pole earth leakage breaker. The terminal cover is inserted from the surface side of the earth leakage circuit breaker, and is fitted into the terminal cover fitting hole of the terminal portion shown in FIG. It is a structure to protect. This terminal cover is also made of a translucent material, and terminal portion confirmation holes are arranged so that the covered terminal portion can be visually confirmed from the outside. Three terminal portion confirmation holes are arranged at positions directly above the terminals in accordance with the number of terminals. Two terminal cover fixing bosses and two terminal cover fitting holes are provided.
On the other hand, although not shown, the two-pole earth leakage breaker has two terminal portion confirmation holes, one terminal cover fixing boss, and one terminal cover fitting hole.
JP 2013-093275 A Mitsubishi Electric Corporation FA Top>Products> Low Voltage Distribution Control Equipment> Low Voltage Circuit Breaker> Product List “Earth Circuit Breaker” Catalog Panasonic Corporation catalog BJW3403 Panasonic earth leakage breaker BJW type (50AF 3P3E 30mA 40A)

  In view of the problems described in the prior art, the present invention provides a test button erroneous operation prevention cover for a ground fault circuit breaker that prevents a person from operating the test button disposed in the ground fault circuit breaker by mistake, and the same. It is an object to provide an earth leakage circuit breaker.

According to a first aspect of the present invention, there is provided a ground fault circuit breaker in which a ground fault detection unit provided with a ground fault cut-off switch and a test button and a terminal unit are integrally formed. The terminal unit includes a terminal cover fixing boss. Is attached to the terminal cover, and a test button cover for preventing a finger or an article from coming into contact with the test button disposed in the leakage detection section is provided between the leakage detection section and the terminal cover. It is fixed to the said leakage detection part without a screw | thread by pinching between them, It is characterized by the above-mentioned.

According to a second aspect of the present invention, the test button cover has a small diameter and allows the test button to be pressed with a dedicated tool at a position opposite to the test button. It has a hole for use.

According to a third aspect of the present invention, the test button cover is made of a transparent material.

According to a fourth aspect of the present invention, the dedicated tool is a rod having a tip diameter of 2 to 4 mm, and the test tool pressing hole that is penetrated can insert the dedicated tool 2.5 to 4 .5 mm in diameter.

According to the present invention,
First, by disposing the test button cover in the leakage detection part of the leakage breaker, it is possible to prevent accidental touching of the test buttons of other leakage breakers.

In addition, by placing a test button pressing hole that penetrates the test button cover at a position opposite to the test button of the leakage detection unit of the leakage breaker, it is possible to leak once a year without removing the test button cover. It is possible to conduct a leakage test on general power supplies that are required to be tested.

  In addition, by making the test button push-down hole provided in the test button cover 2.5 to 4.5 mm in diameter, it can be limited to a leakage test with a dedicated tool inserted. It is possible to prevent a false electric leakage test from coming into contact.

  In addition, the test button cover can be individually connected to the earth leakage breaker by holding the test button cover with the earth leakage breaker of the earth leakage breaker and the terminal cover, or by fixing it to the earth leakage breaker of the earth leakage breaker with a screw. Can be easily arranged.

  In addition, by arranging the test button cover for each earth leakage breaker, it is possible to easily arrange the test button cover even in the switchboard where the earth leakage breaker is arranged in a complicated manner.

  Furthermore, since the test button cover is made of a transparent flat plate, it is easy to mount and remove even if there is a difference in the shape of the earth leakage breaker.

It is a figure which shows one Example which combined the test button cover and earth-leakage circuit breaker of this invention. It is one Example which shows the structure of the test button cover of this invention. It is a figure which shows one Example of the exclusive tool used for this invention. It is a figure which shows another one Example which combined the test button cover and earth-leakage circuit breaker of this invention. It is a figure which shows the example of the switchboard which has arrange | positioned the earth-leakage circuit breaker in a prior art. It is a figure which shows the structure of the earth-leakage circuit breaker of a prior art. It is a figure which shows an example of the terminal cover (upper and lower) structure of the earth-leakage circuit breaker of a prior art.

  The present invention is a test button cover for preventing a finger or an article from coming into contact with a test button disposed on a ground fault interrupter, and the test button cover is positioned at a position opposite to the test button of the ground fault interrupter. A test button cover having a test button push-down hole with a small diameter of 2.5 to 4.5 mm that allows the test button to be operated with a rod-shaped dedicated tool having a tip diameter of 2 to 4 mm.

  The test button cover is a test button cover made of a transparent material. The transparent material is preferably made of a transparent plastic such as acrylic.

In addition, the test button cover is a structure that is sandwiched between the leakage detection unit of the leakage breaker and the terminal cover, and can be fixed to the leakage detection unit without a screw, or the leakage detection unit of the leakage breaker This structure is fixed to the terminal cover at a position opposite to the test button with a screw.
Here, the names of both the upper terminal cover and the lower terminal cover are changed depending on the position where the terminal cover is attached to the earth leakage breaker, but the present invention can be used for both the upper terminal cover and the lower terminal cover. It is.

[Example 1]
A first embodiment of the present invention will be described with reference to FIG.

The earth leakage breaker 1 includes an earth leakage detection unit 3 incorporating an earth leakage breaking switch 5, an upper terminal unit 2, and a lower terminal unit 4.
An upper terminal cover 6 is mounted on the front surface side of the upper terminal portion 2 by an upper terminal cover fixing boss 6a integrally formed on the back surface of the upper terminal cover. Similarly, the lower terminal cover 7 is attached by a lower terminal cover fixing boss 7a integrally formed on the back surface of the lower terminal cover 7.
On the surface side of the leakage breaker 3, a leakage breaker switch 5 and a test button 8 are arranged.

  As shown in FIGS. 2A) and 2B), the test button cover 9 is positioned with a lower terminal cover fixing boss 7a for positioning with a lower terminal cover fixing boss 7a. And has a test button pressing hole 9a penetrating the test button cover 9 at a position facing the test button 8 installed on the surface side of the leakage breaker 3. The test button pressing hole 9a is a through hole into which a dedicated tool for operating the opposing test button 8 is inserted. Here, the dedicated tool has a rod shape with a tip diameter of 2 to 4 mm, and is configured not to function in the same manner as a dedicated tool when touched by a general article or hand.

The test button may be slightly different depending on the earth leakage breaker, but is approximately d2 = 7 mm in diameter. In order to operate this 7 mm diameter test button, the test button pressing hole 9a has a diameter of 2.5 to 4.5 mm which is slightly larger than a rod-shaped hole having a tip diameter of 2 to 4 mm of a dedicated tool. It is desirable.
Further, the depth t of the test button pressing hole 9a, that is, the thickness t of the test button cover 9 at the portion where the test button pressing hole 9a is disposed, is a dedicated tool even when the corner of an acute article hits. The dimension of d1 ≦ t ≦ 2 × d1 is desirable so as not to perform the same function as.
However, with regard to the maximum value (2 × d1) of the plate thickness t of the test button cover 9, the length of the fitting portion between the lower terminal cover fixing boss and the terminal cover fitting hole of FIG. Therefore, it is necessary to set appropriately so as not to become insufficient.

  In this embodiment, acrylic resin is used as the material for the test button cover 9, but the temperature of the distribution board or switchboard serving as the use environment is generally 40 to 70 ° C. It is necessary to be able to withstand the temperature and to be transparent so that the condition inside the test button cover 9 can be confirmed from the outside.

  Considering these factors, methacrylic resin (acrylic resin), AS resin (acrylonitrile styrene), polycarbonate, and ABS resin are suitable although there is a disadvantage that some opacity appears after long-term use. ing. In view of price, availability, etc., methacrylic resin (acrylic resin) is suitable.

Next, a dedicated tool will be described with reference to FIG.
FIG. 3a) is a conceptual diagram of a round dedicated tool having a flat tip shape. The outer diameter is d1 = 2 to 4 mm. Further, the length of the outer diameter d1 portion is set to an appropriate value that is one to two times the outer diameter.
FIG. 3b) shows an example in which a + driver of a precision screwdriver is used as a dedicated tool instead of a round dedicated tool with a flat tip shape. An outer diameter d1 = 2 to 4 mm is appropriately selected. As for the length of the outer diameter d1, the appropriate value of 1 to 2 times the outer diameter can be automatically selected by using a standard precision screwdriver.
By using these dedicated tools, it is possible to make the worker who conducts the leakage test aware that the leakage test will be performed from now on, and improve the reliability of the leakage test.

With the above configuration, the test button cover 9 is disposed without protruding from the external dimensions of the earth leakage circuit breaker 1, so that the same distribution board or distribution board as in the past can be employed. In addition, the present invention can be adopted even for a distribution board or a leakage breaker 1 in a distribution board that is currently installed and used.
[Example 2]
As Embodiment 2 of the present invention, another embodiment in which the arrangement of the test button cover 9 of Embodiment 1 is changed will be described with reference to FIG. In addition, description of the part which is common in Example 1 is omitted.

  The test button cover 9 according to the second embodiment is not mounted between the lower terminal portion 4 and the lower terminal cover 7 of the earth leakage circuit breaker 1 according to the first embodiment, but is attached to the lower terminal cover 7. A hole 10a is provided, the test button cover mounting hole 10a is used to fasten the test button cover connecting bolt 10 to the terminal cover confirmation window of the terminal cover shown in FIG. The difference from the first embodiment is related to the change in the fixing method of the test button cover 9, and the material, plate thickness, dedicated tool and the like of the test button cover 9 are the same as those in the first embodiment. Here, the terminal portion confirmation window is previously tapped in accordance with the test button cover connecting bolt.

  Also in this method, as in the first embodiment, the test button cover 9 is disposed without protruding from the external dimensions of the earth leakage breaker 1, so that the same distribution board or switchboard as in the past should be adopted. Can do. In addition, the present invention can be adopted even for a distribution board or a leakage breaker 1 in a distribution board that is currently installed and used.

  Further, in both Example 1 and Example 2, the structure around the test button is such that only the test button pressing hole of the test button cover is released to the outside (the test button is completely covered with the test button cover and the test button is pressed down). The earth leakage test is limited to the operation of the test button with the dedicated tool, because only the hole is released, and the test button push hole is used and the earth leakage test can be performed only with a dedicated tool. The As a result, a so-called fully interlocked test button cover can be provided, and an erroneous leakage test due to inadvertent contact can be completely prevented.

DESCRIPTION OF SYMBOLS 1 ... Earth leakage breaker 2 ... Upper terminal part 3 ... Earth leakage detection part 4 ... Lower terminal part 5 ... Earth leakage interruption switch 6 ... Upper terminal cover (terminal cover)
6a: Upper terminal cover fixing boss 7: Lower terminal cover (terminal cover)
7a ... Lower terminal cover fixing boss 8 ... Test button 9 ... Test button cover 9a ... Test button pressing hole 9b ... Positioning notch 10 ... Test button cover connecting bolt 10a ... Test button cover mounting hole

Claims (4)

In the earth leakage circuit breaker in which the earth leakage detection part in which the earth leakage breaking switch and the test button are arranged and the terminal part are configured integrally,
A terminal cover integrally formed with a terminal cover fixing boss is attached to the terminal portion.
A test button cover for preventing a finger or an article from coming into contact with the test button disposed in the leakage detection unit is sandwiched between the leakage detection unit and the terminal cover, so that the leakage can be performed without a screw. An earth leakage circuit breaker fixed to a detection unit. The test button cover has a small-diameter and penetrating test button pressing hole that allows the test button to be operated with a dedicated tool at a position facing the test button. The earth leakage circuit breaker according to claim 1. The earth leakage circuit breaker according to claim 1, wherein the test button cover is made of a transparent material. The dedicated tool is in a rod shape having a tip diameter of 2 to 4 mm, and the penetrating test button pressing hole has a diameter of 2.5 to 4.5 mm into which the dedicated tool can be inserted. The earth leakage circuit breaker according to any one of claims 1 to 3.