JP2979785B2 - Earth leakage breaker with terminal block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage circuit breaker which uses a terminal block adapter for positioning a signal line terminal block attached to an earth leakage breaker relative to a main body case and fixing the relative position. The information that the signal line transmits from the earth leakage breaker to the outside includes the type of fault current that the earth leakage breaker has interrupted and the open / closed state of the circuit breaker. There is a check signal for checking for abnormal operation, that is, a test current for passing through the zero-phase current transformer.

[0002]

2. Description of the Related Art An earth leakage breaker detects a fault current generated in an electric circuit, particularly a leakage current to the ground, and cuts off the electric circuit to protect the electric circuit or a load device connected to the electric circuit. Indicates various information at the time of interruption, for example, information on the type of failure current such as whether the interrupted fault current is a ground leakage current or an overload current, and indicates whether the circuit breaker has normally performed an interrupting operation. Information on the position of the movable main contact, or a check signal for remotely checking the presence / absence of an open / close operation of the circuit breaker, that is, data that passes through the zero-phase current transformer and trips to the secondary side of the zero-phase current transformer May be provided with a signal line terminal block for transmitting a test current or the like for inducing an electric current.

[0003] Usually, such a terminal block is attached to the side of the main body case of the earth leakage breaker. 2A and 2B show the mounting state of such a terminal block. FIG. 2A is a perspective view of an earth leakage breaker main body case, and FIG. 2B is a perspective view of the terminal block viewed from the front side. Figure (C) is a perspective view of the terminal block as viewed from the back side, and Figure (D) is a perspective view of the terminal block stopper, and Figure (E).
FIG. 4 is a front view showing a state where the terminal block is attached to the earth leakage breaker main body. The side surface of the earth leakage breaker main body case 1 is provided with a recess 1a having a dovetail-shaped cross section. The rear surface of the terminal block 2 is provided with a dovetail-shaped convex portion 2a having a cross-sectional shape that can be fitted into the concave portion 1a on the side surface of the main body of the earth leakage breaker, and a mortise 2b is provided at a lower portion of the front surface. The terminal block stopper 3 has a mounting hole 3a and a mortise 2b of the terminal block on the front surface.
There is a tenon 3b that can fit into the mortise. 4 is a tapping screw.

When the terminal block 2 is mounted on the side surface of the main body 1 of the earth leakage breaker, the projection 2a on the back surface of the terminal block 2 is inserted from the lower part of the concave portion 1a on the side surface of the main body case 1 of the earth leakage breaker. In this state, the terminal block 2 does not come off in the forward direction, but in order to prevent the terminal block 2 from coming out in the opposite direction to the insertion, the tenon 3b of the terminal block retaining fitting 3 is inserted into the mortise hole 2b at the lower front of the terminal block 2. A tapping screw 4 is screwed into and fixed to the bottom surface of the earth leakage breaker main body case 1 through the mounting hole 3a from the back side of the retaining fitting 3.

[0005]

In the conventional earth leakage breaker with a terminal block, the terminal block is attached to the left or right side of the main body case, so that the width occupied by the earth leakage breaker is smaller than that without the terminal block. And the width is increased by the thickness of the terminal block. This allows
In recent years, in order to reduce the size of the board that houses the earth leakage breaker, the mounting method is mainly used, but the board width is the size taking into account the thickness of the terminal block, and from the size of the terminal block However, there is a problem that the width occupied by the earth leakage breaker cannot be reduced even if it is attached to any side of the earth leakage breaker body case.

An object of the present invention is to provide an earth leakage circuit breaker having a signal line terminal block and having the same width as that without a terminal block.

[0007]

In order to solve the above-mentioned problems, according to the present invention, an earth leakage breaker with a terminal block is provided with a main body case having a concave portion on the load side, and one of the main body case and the main body case load side. It has a terminal block adapter with at least two steps that are at least two steps different from each other, with a surface to be inserted into the concave portion and the rest as a terminal block mounting surface. It has a terminal block adapter with a stepped cross section, for transmitting information such as the type of interrupted fault current. A circuit breaker in which a signal line terminal block having a width smaller than the width of the main body case is mounted on the load side of the main body case.

In this case, it is preferable that the recess on the load side of the main body case is formed in a groove shape on the back side of the main body case from the load side end face of the main body case toward the power supply side. Preferably, the recess of the main body case formed in a groove shape is provided at an intermediate position between the main circuit load side terminals. Then, a female screw is formed on the insertion surface of the terminal block adapter into the body case load side recess, and a through hole is formed in the body case to penetrate the bottom surface of the recess of the body case from the front side of the body case. It is further preferable that the insertion surface of the terminal block adapter be tightly fitted to the bottom surface of the concave portion of the main body case by being inserted from the front side.

[0009]

According to the present invention, the only information that must be transmitted through the signal line is the type of the fault current interrupted by the circuit breaker, and the mechanical status that indicates the open / closed state (open or closed) of the circuit breaker. Display means and test push buttons for checking whether the circuit breaker operates normally are provided on the circuit breaker itself, and it is often not always necessary to monitor all information from a distance. It pays attention to.
An earth leakage breaker is a tripping mechanism that normally trips a hook that holds an open / close mechanism that drives a movable main contact in an energized state. In addition, an overcurrent tripping mechanism and a short-circuit current tripping mechanism are provided, and the information to be transmitted is either a leakage current or a large current such as an overcurrent or a short-circuit current.
There is no mechanism for mechanically performing all of these displays, and whether the current is a leakage current or a large current is electrically transmitted to the outside via the auxiliary contact. Therefore, by configuring the earth leakage breaker with terminal block as the above means,
Insert the terminal block adapter into the body case load side recess 1
In the case where only two surfaces, one surface and the terminal block mounting surface, are used, an earth leakage breaker having a minimum necessary function for information transmission can be obtained, and a large number of control panels accommodating the earth leakage breakers. Can meet the demands of If necessary, the terminal block mounting surface of the stepped terminal block adapter is formed in a plurality of stages, so that all information can be transmitted as in the related art. Therefore, with the configuration of the above-described means, the circuit breaker with the terminal block can be formed to have the same width as that of the circuit breaker without the terminal block.

[0010] For close mounting of the earth leakage breaker, a connecting plate having a length equal to the arrangement width of the earth leakage breakers is used. The connecting plate usually has an upper edge and a lower edge bent forward, and the upper edge and the lower edge hold the earth leakage breaker between the two edges. Accordingly, by forming the recess on the load side of the earth leakage breaker main body case on the back side of the main body case, and forming a groove shape from the load side end face of the main body case toward the power supply side, and forming the terminal block adapter in a step shape, Even after holding the main body of the earth leakage breaker on the upper and lower edges of the connecting plate, insert the insertion surface of the terminal block adapter into the recess without being hindered by the upper and lower edges, and fix the terminal block adapter to the main body of the earth leakage breaker, Subsequently, the terminal block can be mounted on the terminal block mounting surface of the terminal block adapter.

In this case, when the main body case load side recess formed in a groove shape is located at an intermediate position between the main circuit load side terminals, the fixing of the terminal block adapter to the bottom surface of the recess is prevented by the main circuit load side terminal. It can be easily performed using screws from the front side or the back side of the main body case without using the screws. Therefore, a female screw is formed on the insertion surface of the terminal block adapter into the recess on the load side of the main unit case, and the insertion surface of the terminal block adapter is tightened tightly to the bottom surface of the concave portion through the through hole formed in the main case. For example, it is not necessary to make a hole in the connecting plate for fixing the terminal block adapter to the main body case, and the terminal block adapter can be more easily fixed to the main body case load side recess.

[0012]

FIG. 1 shows an embodiment of the present invention. Members or portions corresponding to those in FIG. 2 are denoted by the same reference numerals. The concave portion 1a on the main body case load side is formed in a square groove shape on the back side of the main body case 1 and from the load side end face of the main body case 1 toward the power supply side, and this groove is not particularly shown in the drawing. Is located at an intermediate position between the load terminals of the main circuit in the main body case. A large-diameter hole 1 that penetrates through the insulating cover 6 of the earth leakage breaker main body and reaches an appropriate depth of the main body case 1.
b and a small-diameter hole 1d extending coaxially from the hole 1b and penetrating the bottom surface of the concave portion 1a. A signal terminal block 2 is used for two terminals.
The terminal block 2 is attached to the main body case 1 by inserting the insertion surface 13c of the terminal block adapter 13 into the concave portion 1a of the main body case and screwing the screw 5 through the stepped hole into the female screw 13a of the terminal block adapter. After fixing the terminal block adapter to the main body case 1 by tightening the terminal block adapter to the bottom of the concave portion, the hole 2a of the terminal block 2 and the female screw 13 of the terminal block adapter are fixed.
The fixing is performed by fixing the terminal block 2 to the terminal block adapter 13 by using b.

[0013]

As described above, according to the present invention, in the present invention, the earth leakage breaker with a terminal block is formed as a main body case having a concave portion on the load side, and one is formed as a surface to be inserted into the main body case load side concave portion. It has a terminal block mounting surface, at least two stepped surfaces, and a terminal block adapter with a stepped cross section. The width of the terminal block is smaller than the width of the main body case for transmitting information such as the type of fault current that has been interrupted. Since the small signal line terminal block is mounted on the load side of the body case, the width of the circuit breaker is the same as that of the circuit breaker without terminal block.
The width was reduced by about 1/4 to 1/6. Conventionally,
The width dimension of multiple earth leakage breakers arranged in close contact in a horizontal row, which was distinguished by the presence or absence of the terminal block, can be managed only by the width of the earth leakage breaker main body, and the specification of the board width is incorrect. Is avoided, the size of the board is reduced, and the cost of the board is reduced, and the cost of the board related to the width of the board is also reduced.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of an earth leakage breaker with a terminal block according to the present invention, wherein FIG. 1 (A) is a perspective view of an earth leakage breaker main body case, and FIG. 1 (B) is a perspective view of the terminal block. (D) is a perspective view of the terminal block adapter.

FIG. 2 is a diagram showing an example of a conventional earth leakage circuit breaker with a terminal block, wherein FIG. 2 (A) is a perspective view of an earth leakage silicon main body case,
FIG. 2B is a perspective view of the terminal block viewed from the front side, FIG. 2C is a perspective view of the terminal block viewed from the back side, and FIG. 2D is a perspective view of the terminal block stopper. Figure (E) is a front view showing the terminal block attached to the earth leakage breaker body.

[Explanation of symbols]

 Reference Signs List 1 body case 1a recess 1b hole 1d hole 2 terminal block 5 screw 13 terminal block adapter 13a female screw 13c insertion surface 13d terminal block mounting surface

Claims (4)

(57) [Claims] 1. A main body case having a concave portion on a load side, and at least two surfaces having a step difference, one of which is a surface for inserting into the concave portion on the load side of the main body case and the other is a mounting surface for a terminal block. And a terminal block for signal lines with a width smaller than the width of the main body case to transmit information such as the type of interrupted fault current. Characteristic earth leakage breaker with terminal block. 2. The earth leakage breaker according to claim 1, wherein the recess on the load side of the main body case is formed in a groove shape on the back side of the main body case from the load side end face of the main body case toward the power supply side. An earth leakage circuit breaker with a terminal block. 3. An earth leakage breaker with a terminal block according to claim 2, wherein the recess of the main body case formed in a groove shape is located at an intermediate position between the main circuit load side terminals. vessel. 4. An earth leakage circuit breaker according to claim 3, wherein a female screw is formed on the insertion surface of the terminal block adapter into the concave portion on the load side of the main body case, and the bottom surface of the concave portion of the main body case is arranged from the front side of the main body case. A through hole is formed in the main body case, and the insertion surface of the terminal block adapter is tightened to the bottom surface of the main body case recess by inserting screws from the front side of the main body case. Earth leakage breaker.