JPH0750127A - Circuit breaker - Google Patents

Abstract

PURPOSE:To carry out continuity test or insulating resistance measurement test without removing the terminal cover of a circuit breaker, and to verify the condition of the connection part. CONSTITUTION:In a terminal cover 24 covering the connection part 8 between a power source side terminal 6 and a connection wire 7 for power source, as well as a terminal cover 25 covering the connection part 21 between a load side terminal 19 and a load side connection part 20, an opening part 26 is formed on the part of each connection part 8, 12, and a door 28 for opening/ closing each opening part 26 is provided. When a continuity test or insulating resistance measurement test is to be carried out, the measurement terminal of a meter is brought into contact with the power source side terminal 6 and to the load side terminal 19 through the opening part 26 to carry the test out. The conditions of the connection parts 8, 21 can be seen through the opening part 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having a terminal cover.

[0002]

2. Description of the Related Art Conventionally, in a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, a breaking element having a fixed contact and a movable contact for contacting with and separating from the case is housed in the case and the fixed contact is provided. The power supply side terminal and the load side terminal connected to the child and the movable contact are arranged at the end of the case, and the connection part connecting the power supply side terminal and the power supply side connecting wire, and the load side terminal and the load side connection There is a configuration in which the connection portions connecting the wires are covered with terminal covers.

[0003]

By the way, in the above-mentioned structure, when a continuity test or an insulation resistance measurement test of a circuit breaker is to be performed during maintenance / inspection, the continuity tester with the terminal cover attached is required. The measurement terminal of the insulation resistance tester cannot be brought into contact with the power supply side terminal and the load side terminal. Therefore, when conducting the continuity test or the insulation resistance measurement test, it was necessary to remove the terminal cover.

Therefore, the object of the present invention is to provide a circuit provided with a terminal cover, in which a continuity test and an insulation resistance measurement test can be carried out without removing the terminal cover, and the state of the connecting portion can be confirmed. To provide a circuit breaker.

[0005]

According to the present invention, a terminal connected to the breaking element is arranged at an end of a case having a breaking element accommodated therein, and the terminal is connected to a connecting line from the outside. A circuit breaker in which a connecting portion is covered with a terminal cover is characterized in that an opening is provided in a portion of the terminal cover corresponding to the connecting portion.

In this case, it is preferable that the terminal cover is provided with a door for opening and closing the opening. Further, the terminal cover may be configured to collectively cover the connecting portions at a plurality of locations, and the opening may be provided so as to straddle the connecting portions at the plurality of locations.

[0007]

According to the above means, the measuring terminal of the instrument can be brought into contact with the terminal through the opening of the terminal cover,
Thereby, the continuity test and the insulation resistance measurement test can be performed without removing the terminal cover. Further, since the state of the connecting portion can be seen through the opening, the state of the connecting portion can be confirmed without removing the terminal cover.

When the door for opening and closing the opening is provided, the opening can be opened only when necessary and the opening is usually closed by the door, so that the connection can be protected more reliably.

Further, in the case where the opening is provided so as to straddle the connecting portions at a plurality of positions in the terminal cover configured to collectively cover the connecting portions at a plurality of locations, the opening is provided corresponding to each connecting portion. The structure of the terminal cover can be simplified and the number of doors for opening and closing the opening can be reduced as compared with the case where they are individually provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 1 and 2, a case 1 is composed of a case main body 2 and a cover 3, and three pairs of a fixed contact 4 and a movable contact 5 as a blocking element are housed in the case 1. (Only one pair is shown in FIG. 1).

The fixed contactor 4 is fixedly provided on the case main body 2 and has a fixed contact 4a at one end. The other end of the fixed contactor 4 is shown in FIG.
It is guided to the left end of the center, and is configured as the power supply side terminal 6. Each power source side terminal 6 is exposed from the case 1, and one end portion of the power source side connecting wire 7 is connected thereto by a terminal screw 8a to form a connecting portion 8.

The movable contact 5 has the fixed contact 4 at one end.
It has a movable contact 5a that comes in contact with and separates from a. The crossbar 9 is provided so as to be movable in the vertical direction in FIG. 1 along a guide wall 10 formed in the case main body 2, and a lower portion thereof engages with the movable contact 5 from above. Reference numeral 11 denotes a separation spring composed of a compression coil spring, which is arranged between the case main body 2 and the movable contact 5 and biases the crossbar 9 upward through the movable contact 5. .

Reference numeral 12 is an operating mechanism provided with a handle 13,
Based on the operation of the handle 13, the movable contactor 5 is moved up and down via the crossbar 11, and based on this, the movable contact 5a of the movable contactor 5 is brought into contact with and separated from the fixed contact 4a.

Reference numeral 14 is a tripping device, which comprises an oil dash pot 15, a coil 16 provided so as to surround the oil dash pot 15, and an rotatably mounted armature 17. Of these, one end of the coil 16 is connected to the other end of the movable contactor 5 via a flexible conductor 18, and the other end is on the load side provided at the right end of the case main body 2 in FIG. It is connected to the terminal 19. Each load-side terminal 19 is exposed from the case 1, and one end of the load-side connecting wire 20 is connected to the load-side terminal 19 with a terminal screw 21a to form a connecting portion 21.

The trip device 14 attracts and rotates the armature 17 by the oil dash pot 15 when an overcurrent flows in the main circuit, and based on this, the operating mechanism 12 is operated.
To move the movable contact 5a of the movable contact 5 to the fixed contact 4
It is configured to be forcibly separated from a.

At both left and right ends of the case 1, interphase barriers 22 and 23 are provided so as to partition the power supply side terminals 6 from each other and the load side terminals 19 from each other. Power supply side terminal 6 and three load side terminals 1
9 and the terminal covers 24 and 25 so as to cover each of them collectively.
Is detachably attached.

The terminal covers 24 and 25 have respective connection parts 8 and
Three rectangular openings 26 are formed in the region corresponding to 21 and L-shaped grooves 27, 27 are formed on both sides of one end of each opening 26 (FIG. 3 and FIG. (See FIG. 4). Further, each terminal cover 24, 25 is provided with a door 28 for opening and closing each opening 26. In addition, each opening 26 is set to a size into which a measuring terminal (not shown) of a continuity tester or an insulation resistance meter can be inserted.

As shown in FIG. 5, each door 28 has shaft portions 29, 29 on both side portions on one end side.
By inserting 9, 29 into the groove portions 27, 27,
The shafts 29, 29 are rotatably attached to the fulcrum. On the outer surface of each door 28, a convex portion 30 for hanging a finger
Is provided.

In the above structure, the terminal covers 24, 25
When the doors 28 are closed, the terminal covers 24, 25
The door 28 covers the connection portion 8 of each power supply side terminal 6 and the connection portion 21 of the load side terminal 19 and protects them.

On the other hand, when it is necessary to conduct a continuity test or an insulation resistance measurement test during maintenance / inspection, the terminal cover 24,
At 25, the required door 28 is opened. Then, the measuring terminal of the instrument is brought into contact with the power source side terminal 6 and the load side terminal 19 through the opening 26, thereby the terminal cover 24,
The continuity test and the insulation resistance measurement test can be performed without removing 25.

At this time, by opening the door 28, the power supply side terminal 6 and the load side terminal 1 are passed through the opening 26.
Since the states of the connecting portions 8 and 21 of the terminal 9 can be visually observed, the discoloration of the power source side terminal 6 and the load side terminal 19 and the terminal screws 8a and 21 can be performed without removing the terminal covers 24 and 25.
It is also possible to confirm the tightened state of a. When the test and inspection are completed, each door 28 is closed.

6 to 11 show a second embodiment of the present invention, which is different from the above-described first embodiment in the following points. That is, the terminal cover 31 collectively covers the three connection portions 8 of the power source side terminal 6 and the terminal cover 32 collectively covers the three connection portions 21 of the load side terminal 19 respectively. Three connection parts 8, 21
One horizontally long rectangular opening 33 is formed so as to straddle the area. Grooves 3 are formed on both sides of one end of each opening 33.
4, 34 are formed, and a concave receiving portion 35 is formed on the other end side.

Further, each terminal cover 31, 32 is provided with a door 36 for opening and closing each opening 33. As shown in FIG. 10, each door 36 has a shaft portion 3 on both side portions on one end side.
7 and 37, and a protrusion 38 at the other end.
And has both shaft portions 37, 37 in the groove portions 34, 34.
Is attached to the shaft portion 37, 37 so as to be rotatable around the fulcrum.
(See FIG. 11). Each door 3
6, a convex portion 39 for hanging a finger is provided on the outer surface on the side of the convex portion 38.
Is provided. In this case, the interphase barriers 22 and 23 are not provided at both ends of the case 1.

According to such a second embodiment, in addition to the same operational effects as those of the first embodiment, there are the following advantages. That is, since the openings 33 of the terminal covers 31 and 32 are formed so as to straddle the connecting portions 8 and 21, respectively, at the three places, the openings 33 are formed in each of the terminal covers 31 and 32.
The number of individual terminal covers 31 and 32 is simple, and the structure of these terminal covers 31 and 32 is simplified. Further, the door 36 for opening and closing the opening 33 is also 1
The number of the doors 36 can be reduced, and the number of the doors 36 can be reduced, and the opening and closing work of the doors 36, and the test and inspection can be facilitated.

12 and 13 show a third embodiment of the present invention, which is different from the above-mentioned second embodiment in the following points. That is, the opening 40 of the terminal cover 32 (31) (only the terminal cover 32 side is shown in FIGS. 12 and 13) is open at one end side, and the grooves 41, 41 are formed on both sides of the opening 40. There is. The door 42 that opens and closes the opening 40 has ridges 43, 43 on both sides, and by inserting the ridges 43, 43 into the grooves 41, 41 slidably, the terminal cover 32 is formed. It is provided slidably at (31). Also in such a third embodiment, the same operational effects as those of the above-described second embodiment can be obtained.

[0026]

As is apparent from the above description, according to the present invention, in the terminal cover for covering the connecting portion between the terminal and the connecting wire, the opening is provided at the portion corresponding to the connecting portion. Thus, the continuity test and the insulation resistance measurement test can be performed without removing the terminal cover, and the state of the connection portion can be confirmed.

When a door for opening and closing the above-mentioned opening is provided, the opening is opened only when necessary and the opening is normally closed by the door, so that the connecting portion is protected more reliably. You can

Further, when the opening is provided in the terminal cover configured to collectively cover the connecting portions at a plurality of locations so as to extend over the connecting portions at the plurality of locations, the configuration of the terminal cover can be simplified, and The number of doors that open and close the opening can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

2 is a plan view

FIG. 3 is a vertical sectional side view of the terminal cover.

FIG. 4 is a plan view of the terminal cover.

FIG. 5 is a perspective view of a door

FIG. 6 is a plan view showing a second embodiment of the present invention.

FIG. 7 is a view equivalent to FIG.

FIG. 8 is a plan view of the terminal cover with the door attached.

FIG. 9 is a plan view of the terminal cover alone.

FIG. 10 is a perspective view of a door

11 is a sectional view taken along line XX in FIG.

FIG. 12 shows a third embodiment of the present invention, and is a plan view of the terminal cover with a door attached.

13 is a cross-sectional view taken along the line YY in FIG.

[Explanation of symbols]

1 is a case, 4 is a fixed contact (breaking element), 5 is a movable contact (breaking element), 6 is a power source side terminal, 7 is a power source side connecting wire, 8 is a connecting portion, 12 is an operating mechanism, 19 is a load Side terminal,
20 is a load side connecting wire, 21 is a connecting portion, 24 and 25 are terminal covers, 26 is an opening, 28 is a door, 31 and 32 are terminal covers, 33 is an opening, 36 is a door, 40 is an opening, 42 Is a door.

Claims (3)

[Claims] 1. A terminal connected to the blocking element is arranged at an end of a case having a blocking element housed therein, and a connection portion connecting the terminal and a connecting wire from the outside is covered with a terminal cover. The circuit breaker according to claim 1, wherein an opening is provided in a portion of the terminal cover corresponding to the connecting portion. 2. The circuit breaker according to claim 1, wherein the terminal cover is provided with a door that opens and closes the opening. 3. The terminal cover is configured to collectively cover the connecting portions at a plurality of locations, and the opening is provided so as to straddle the connecting portions at the plurality of locations. Or the circuit breaker described in 2.