JP2000197257A - Ground fault circuit interrupter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable constituting a ground fault circuit interrupter by using a constitution of an interrupter for wiring as is, and enable decision as to whether the cause of the interrupt of a main circuit is generation of leakage or overcurrent. SOLUTION: A ground fault circuit interrupter is constituted by combining a leak-detecting unit 2 and a leak tripping unit 3 with a main circuit interrupting unit 1. The main circuit interrupting unit 1 is constituted by accommodating a switching mechanism or the like in a first case 4. The leak-detecting unit 2 is constituted by accommodating a leak-detecting means constituted of a main circuit conductor part, a zero-phase current transformer, a leak- detecting circuit, etc., in a second case 11. The leak-tripping unit 3 is constituted by accommodating a leak-tripping mechanism constituted of a electromagnet, a moving core, a sliding member which pivots in accordance with pivoting of the moving core and trips and operates the switching mechanism, etc., and a leak-displaying mechanism constituted of a displaying lever which is pivoted linking with the pivoting of the moving core, in a third case 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker configured to shut off a main circuit when an electric leakage occurs and when an overcurrent flows in the main circuit.

[0002]

An earth leakage circuit breaker interrupts the main circuit when a ground fault occurs in a load or a main circuit, and detects an earth leakage current flowing through the main circuit. It is provided with a detection mechanism, a leak detection trip mechanism that trips the opening / closing mechanism when a leak is detected, a leak display mechanism, and the like. Some of the earth leakage breakers have a function of a circuit breaker for wiring. In this case, an overcurrent tripping mechanism that trips the switching mechanism when an overcurrent flows in the main circuit. Etc. are provided.

[0003] By the way, since the earth leakage breaker having the function of the above-mentioned wiring breaker has a smaller market than the wiring breaker, the earth leakage breaker is constructed by using the structure of the wiring breaker. Has been done conventionally. This is because when manufacturing equipment dedicated to earth leakage breakers separately from circuit breakers for wiring,
This is because the total number of component types including the wiring breaker and the earth leakage breaker increases, the management becomes complicated, and the manufacturing cost rises.

An earth leakage circuit breaker using such a circuit breaker is generally constructed by incorporating an earth leakage relay in a case of the circuit breaker. However, when the earth leakage relay is incorporated in the case of the wiring breaker as described above, since the earth leakage display mechanism cannot be provided, whether the cause of the interruption of the main circuit is the occurrence of the earth leakage or the overcurrent. There was a problem of not knowing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make use of the structure of a circuit breaker for wiring as it is. It is an object of the present invention to provide an earth leakage breaker capable of determining whether or not the current is short.

[0006]

According to a first aspect of the present invention, there is provided an earth leakage breaker having an opening / closing mechanism housed in a first case and shutting off the main circuit when an overcurrent flows in the main circuit. An electric leakage detection unit housed in a second case coupled to the first case, the electric leakage detection unit including an electric leakage detection unit that detects the occurrence of electric leakage and outputs an electric leakage detection signal; A leakage leakage release mechanism that is housed in a third case coupled to the case, and that trips and operates the opening / closing mechanism based on the leakage detection signal; and a leakage leakage display mechanism that displays a leakage in conjunction with the leakage leakage removal mechanism. Wherein the second case and the third case are each configured to be detachable from the first case.

[0007] According to the above configuration, the second case moves from the first case to the second case.
When the third case is removed, the main circuit cutoff unit functions as a circuit breaker, so that a small earth leakage breaker on the market can be configured using the structure of the circuit breaker as it is. In addition, since the earth leakage display unit is provided with the earth leakage trip unit, even if the earth leakage breaker is configured using the main circuit interruption unit that functions as a wiring breaker, the cause of the main circuit interruption may not be the same. Thus, it is possible to immediately determine whether the leakage is due to the occurrence of a short circuit or the overcurrent.

In this case, a load-side terminal is provided in the first case, and a main circuit conductor connected to the load-side terminal is provided on the second case so as to protrude outward from the second case. When the second case is connected to the first case by connecting the main circuit conductor to the load-side terminal, the first case and the second case are connected to each other.
There is no need to provide a special member for coupling the case (1), and the configuration can be simplified (the invention of claim 2).

The third case is configured to have an engaging member that engages with a predetermined engaged portion of the first case, and an elastic member that holds the engaging state of the engaging member. Then, the third case can be securely joined to the first case (the invention of claim 3).

[0010] Further, the earth leakage trip mechanism includes an electromagnet comprising a fixed iron core and a coil wound around the fixed iron core;
A movable core rotatably disposed so as to face an end of the fixed core, a biasing unit for biasing the movable core to be separated from the fixed core, and a rotating operation of the movable core. An interlocking actuator, wherein the leakage detecting means is configured to output an operating voltage of the coil as a leakage detecting signal, and when the movable iron core is attracted to the fixed iron core, the actuator opens and closes. May be configured to be tripped (invention of claim 4).

According to the above configuration, when a leakage occurs, the operating voltage is applied to the coil from the leakage detection means. As a result, the movable core is attracted to the fixed core, and the actuator trips and operates the opening / closing mechanism, so that the main circuit can be shut off based on the occurrence of the leakage. In this case, the actuator can be constituted by a slide member that slides in accordance with the turning operation of the movable iron core (the invention of claim 5).

Further, the third case has a window for displaying an electric leakage, and the electric leakage display mechanism is rotatably provided in the third case, and a display lever partially located in the window. And an elastic member that urges the display lever to rotate in one direction, wherein the display lever is normally locked to a movable core or a member that rotates integrally with the movable core, When the iron core is attracted to the fixed iron core, the engagement of the display lever with the movable iron core or the member is released and the display lever is rotated to change the amount of projection of a part of the display lever from the inside of the window. It is good to constitute (the invention of claim 6).

According to the above construction, the display lever is rotated in conjunction with the rotation of the movable iron core or a member which is integrally rotated with the movable iron core based on the occurrence of leakage, and the window portion of a part of the display lever is rotated. The leakage display mechanism can be configured with a relatively simple configuration in which the amount of protrusion from the ground changes.

Further, when the movable core is attracted to the fixed core, the display lever is released from the engagement with the movable core or the member and is rotated, so that the portion of the display lever located in the window changes. This is a good configuration (the invention of claim 7). In such a configuration, if the color of the portion located in the window portion of the display lever is different before and after the movable iron core is sucked by the fixed iron core, the portion of the display lever that is visible from the window portion due to the occurrence of electric leakage. Not only is different, but also its color is changed, so that it is easy to recognize the leakage display, and it is possible to prevent erroneous determination of the cause of the main circuit interruption (the invention of claim 8).

Further, an electric leakage display mechanism is provided in the third case so as to be slidable, and a display lever partially located in the window portion, and a bias is applied so that the display lever slides in one direction. The display lever is normally locked by a slide member, and when the movable core is attracted to the fixed core, the lock on the slide member is released and the display lever slides. The position of a part of the display lever in the window may be changed (the invention of claim 9).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claims 1 to 6) of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing the appearance of the entire earth leakage breaker. As shown in FIG. 1, the earth leakage breaker is configured by combining a main circuit interruption unit 1, an earth leakage detection unit 2, and an earth leakage trip unit 3. FIG. 2 is a perspective view of an earth leakage breaker showing the units 1 to 3 separately. As shown in FIG. 2, a case (hereinafter, a first case) 4 of the main circuit breaking unit 1 is , Upper and lower cases 4a and 4b. An opening 4c is provided on the upper surface of the upper case 4a, and the handle 5 projects outside from the opening 4c.

The upper case 4a has power supply terminals 6a, 6b, and 6c for U, V, and W phases in an upper portion in FIG. 2, and load terminals 7a, 7b in a lower portion. ,
7c is provided. Further, a first hole 8 is provided in the right side surface of the upper case 4a.

Although not specifically shown, the main circuit cutoff unit 1 is configured by housing an opening / closing mechanism, a contact, a tripping mechanism, an arc extinguishing device, and the like in the case 4, and is independent of the case 4. It is configured to function as a circuit breaker for wiring.
The opening and closing mechanism is, as is well known, the O
This is a mechanism for linking the N and OFF operations with the opening and closing operation of the contact. The tripping mechanism is a mechanism that acts on a latch of the opening / closing mechanism to perform a tripping operation when an overcurrent flows in the main circuit. This tripping operation is performed by disengaging the latch between the trip lever common to each phase and the latch.

FIG. 6 shows the positional relationship between the trip lever 9 and the latch 10 in the first case 4. As shown in FIG. 6, the trip lever 9
The latch 10 is rotatably mounted in the case 4 via a shaft 9a.
It is rotatably mounted via a. The trip lever 9 is urged in the direction of arrow A1 by a spring (not shown), and is at the position shown in FIG. 6 when overcurrent is not detected. The latch 10 is urged in the direction of arrow A2 by a spring (not shown). The handle 5 is O
When the latch 10 is at the N position, the right end of the latch 10 in the figure is locked by the trip lever 9, thereby preventing the latch 10 from rotating in the direction of arrow A2.

On the other hand, as shown in FIG. 2, the case (hereinafter, referred to as a second case) 11 of the earth leakage detecting unit 2 is composed of upper and lower cases 11a and 11b. The main circuit conductors 12a of each phase of U, V, and W are provided from the side of the case 11 to be attached to the first case 4.
12c protrude from one end. The lower part of the second case 11 in FIG.
Load-side terminals 13a-1 to which the other ends of a-12c are connected
3c is provided. The main circuit conductors 12a to 12
c are connected to the corresponding load-side terminals 7a to 7c of the main circuit cutoff unit 1 by screws, so that the second case 11 is coupled to the first case 4. Have been. Further, output terminals 14 are provided on the right side surface in FIG. 2 of the second case 11 (upper case 11a).

Next, the internal configuration of the leakage detecting unit 2 will be described with reference to FIG. FIG. 3 is a view showing the second case 11 from which the right side surface portion shown in FIG. 2 is removed. As shown in FIG. 3, the main circuit conductor portions 12a to 12c are provided at a lower portion in the case 11. (Only the main circuit conductors 12b and 12c are shown), and the zero-phase current transformer 15 is provided in these main circuit conductors 12a to 12c. Further, a circuit board 17 on which an electric leakage detection circuit 16 and the like are mounted is provided in an upper part in the case 11.
The zero-phase current transformer 15, the leakage detection circuit 16 and the like constitute leakage detection means.

The zero-phase current transformer 16 includes a main circuit conductor 12
It is configured to generate a detection voltage corresponding to the magnitude of the leakage current flowing to the ground through a to 12c and to supply the detection voltage to the leakage detection circuit 16. Then, the leakage detection circuit 16
Is configured to output a leakage detection signal according to the detection voltage, in this case, an operating voltage of an electromagnet described later.

On the other hand, as shown in FIG. 2, a case (hereinafter, a third case) 1 of the earth leakage trip unit 3 is used.
8 includes a left case 18a and a right case 18b. As shown in FIG. 4, a second hole 19 is provided at a portion of the left case 18 a corresponding to the first hole 8 on a surface of the left case 18 a to be attached to the first case 4.
The operation protrusion 20a of the slide member 20 as an actuator is configured to protrude from the second hole 19. The configuration of the slide member 20 will be described later.

The left case 18a has two engaging projections 21a and 21b on its left side in FIG. 4 as engaging members. These engagement projections 21a and 21b are
The first case 4 is configured to engage with engagement recesses 22a and 22b (see FIG. 2), which are engaged portions, provided at corresponding portions of the first case 4. Further, the left case 18
4, an engaging member 23 is rotatably mounted on a shaft 23a. This engaging member 2
3 is configured to engage with an engagement recess 24 which is an engaged portion provided at a corresponding portion of the first case 4.

The engaging member 23 is urged in the direction of arrow B by a coil spring 25 (see FIG. 5), which is an elastic member, and its upper half is normally a concave portion 18c of the left case 18a (see FIG. 5). See). Then, when the pressing portion 23b is pressed, as shown in FIG. 5, it is configured to come out of the concave portion 18c. Therefore, when attaching the third case 18 to the first case 4, the engaging projections 21a, 21b are pressed while pressing the pressing portion 23b.
Are engaged with the engagement recesses 22a and 22b, and the engagement member 23 is matched with the engagement recess 24. Thereafter, by returning the engagement member 23 to the original state, the engagement member 23 is engaged with the engagement concave portion 24, and the third case 18 is attached to the first case 4.

Further, two holes 26, 26 are formed in the upper part of the right side in FIG. 4 of the left case 18a, and connection conductors 27, 27 extend from these holes 26 to the outside. I have. The connection conductor 27 is configured so that its end is connected to the output terminal 14 of the leakage detection unit 2. Further, as shown in FIG.
A window 28 is provided on the upper part of the case 18.
The display lever 2 which constitutes the leakage display mechanism in the window 28
9 (see FIG. 5) are disposed.

Next, the internal structure of the earth leakage trip unit 3 will be described with reference to FIGS. As shown in FIG. 5, a fixed frame 30 is provided at a lower central portion in the third case 18. A fixed iron core 32 around which a coil 31 is wound is fixed to the fixed frame 30. An electromagnet 33 is composed of the coil 31 and the fixed iron core 32. The left end of the third case 18 in FIG.
1 and a connecting conductor 2 extending outside through the hole 26
7 are provided. The connection conductor 27 extends the electric wire 31a of the coil 31 and surrounds the covering member 27.
a.

A movable frame 34 is rotatably mounted on the fixed frame 30 via a shaft 34a. FIG.
As shown in the figure, the movable frame 34 has a concave portion 34b opening downward, and the movable iron core 35 is provided in the concave portion 34b.
Is housed. A coil spring 36 serving as an urging means is attached between the fixed frame 30 and the movable frame 34, and the movable frame 34 is urged in the direction of arrow C1 by the elastic force of the coil spring 36. . Therefore, normally, as shown in FIG. 6, the movable core 35 is separated from the fixed core 32.

The slide member 20 is disposed in the third case 18 to the left of the movable frame 34 and the electromagnet 33 in FIG. 6 (to the rear in FIG. 5). A U-shaped guide portion 37 is provided on a left surface portion in FIG. 6 of the movable frame 34 (a rear surface portion in FIG. 5), and an engagement protrusion 20b provided on a right surface portion of the slide member 20 is provided. It is locked to the guide portion 37. Although not shown, the slide member 20 is provided on both front and rear sides (in FIG. 5, both right and left sides) of the slide member 20 in the inner surface of the third case 18 in accordance with the rotation of the movable frame 34. 2
A guide member is provided for guiding the O to slide vertically.

Further, the operation protrusion 20a is provided on the left side of the slide member 20 in FIG. The operation protrusion 20a is disposed in the first case 4 through the second hole 19 and the first hole 8 when the third case 18 is attached to the first case 4. It is configured to: At this time, the operation protrusion 20a is configured to be located above the right end of the trip lever 9, as shown in FIG. As described above, the leakage leakage removing mechanism is configured from the fixed frame 30, the electromagnet 33 (the coil 31, the fixed iron core 32), the movable frame 34, the movable iron core 35, the coil spring 36, and the slide member 20.

Further, as shown in FIG. 5, the above-mentioned display lever 29 is provided at the upper part in the left case 18a.
It is provided so as to be rotatable via “b”. The display lever 29 has a substantially Z-shape, and the upper end 29a is disposed in the window 28 of the case 18 as described above. The display lever 29 is urged to rotate in the direction of arrow C2 by a torsion coil spring 38 (see FIGS. 7 and 8) serving as an elastic member inserted into the shaft 29b. ), The lower end of which is the movable frame 34
At the left end. Thus, the rotation of the display lever 29 in the direction of the arrow C2 is prevented. The display lever 29, the shaft 29b, the torsion coil spring 38 and the like constitute a leakage display mechanism.

Next, the operation of the present embodiment will be described with reference to FIGS. 7 and 8 are simplified plan views showing the internal structure of the earth leakage trip unit 3, FIG. 7 shows a normal state, and FIG. 8 shows a state when an earth leakage occurs. Here, among the operations of interrupting the main circuit by the earth leakage breaker, only the operation according to the present invention, that is, the operation when an earth leakage occurs will be described.

First, as shown in FIG. 7, the movable iron core 35 is normally separated from the fixed iron core 32,
Window 28 at the upper end 29a of the display lever 29 locked to the
The amount of protrusion from is small. In this state, when a leakage occurs, a detection voltage corresponding to the magnitude of the leakage current is generated in the zero-phase current transformer 15, and a detection signal corresponding to the detection voltage is output from the leakage detection circuit 16. As a result, the output terminal unit 1
4. An operating voltage is applied to the coil 31 via the connection conductor 27, the movable iron core 35 is attracted to the fixed iron core 32, and the movable frame 34 rotates in the direction opposite to the arrow C1. For this reason, the lock of the display lever 29 with respect to the movable frame 34 is released, the display lever 29 rotates in the direction of arrow C2, and the upper end 29a of the display lever 29 protrudes greatly from the window 28 (see FIG. 8). State shown).

On the other hand, as the movable frame 34 rotates in the direction opposite to the arrow C1, the slide member 20 moves downward. As a result, as shown in FIG.
0a turns the trip lever 9 in the direction opposite to the arrow A1. Therefore, the latch 10 is unlocked from the trip lever 9, and the latch 10 rotates in the direction of the arrow A2, thereby causing the opening / closing mechanism to perform a trip operation. As a result, the main circuit is shut off. At this time, the handle 5 moves to the trip position.

When returning the handle 5 to the ON position and returning the display lever 29 to the normal position, first, the leakage of the main circuit is removed. When the handle 5 is reset to the OFF position, the latch 10 returns to the position shown in FIG.
Further, the display lever 29 is pushed down. Then, since the lower end of the display lever 29 moves upward, the movable frame 3
4 is separated from the electromagnet 33 by the urging force of the coil spring 36. As a result, the movable frame 34 rotates in the direction of arrow C1 and returns to the state shown in FIG. At the same time, the slide member 2
0 moves upward and the trip lever 9 returns to the position shown in FIG.

In this embodiment having such a structure, the main circuit shut-off unit 1 having an opening / closing mechanism and independently functioning as a circuit breaker, the earth leakage detecting unit 2 having an earth leakage detecting unit, and the opening / closing mechanism are connected. An earth leakage circuit breaker was configured by combining an earth leakage trip unit 3 having an earth leakage trip mechanism to be operated to be detached. Therefore, since the configuration of the circuit breaker for wiring can be used as it is, unlike the case where a device dedicated to the earth leakage breaker is configured, the number of types of components can be reduced, and the manufacturing cost can be reduced.

Moreover, in this embodiment, since the earth leakage trip unit 3 is provided with the earth leakage display mechanism, the earth leakage breaker is constituted by using the main circuit interruption unit 1 which functions as a wiring breaker. However, it is possible to immediately determine whether the cause of the interruption of the main circuit is due to overcurrent or leakage, and the cause of the interruption of the main circuit can be quickly removed.

In this embodiment, the main circuit cutoff unit 1, the leakage detection unit 2, the leakage trip unit 3
Are respectively housed in first to third cases 4 to 6, and the second and third cases are
Since the cases 5 and 6 are externally attached, the workability of assembling the earth leakage breaker is improved.

Further, in the present embodiment, the movable iron core 35
The leakage of electricity is displayed by changing the amount of protrusion of the display lever 29 from the window 28 that rotates in conjunction with the rotation of the movable frame 34, which is a member that rotates together with the movable frame 34. Therefore, the leakage display mechanism can be configured to have a relatively simple configuration and to reliably display the occurrence of leakage.

FIGS. 9 to 11 show a second embodiment (corresponding to claims 7 and 8) of the present invention, and parts different from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In this second embodiment,
The configuration of the leakage display mechanism is different from that of the first embodiment. That is, a window 41 is formed on the upper surface of the third case 18 instead of the window 28. The case 18
A display lever 42 is rotatably provided at an upper portion of the inside through a shaft 42a. The display lever 42 has a shaft 42
The torsion coil spring 43, which is an elastic member inserted in a, is constantly urged to rotate in the direction of arrow D.

One end of the display lever 42 has a substantially fan-like shape.
The right end of the lower end of the arc 2b is locked to the left end of the movable frame 34. As a result, the rotation of the display lever 42 in the direction of arrow D is prevented. Further, in the present embodiment, the lower end of the fan-shaped portion 42b is set so as to form an arc centered on a point (not shown) which is located slightly rightward in FIG. 9 from the shaft 42a. I have.

On the other hand, the other end of the display lever 42 serves as a leakage display section 44 which is disposed in the window 41 and displays the presence or absence of leakage. When the display lever 42 is at the normal position, as shown in FIG. 9, the flat portion 44a of the electric leakage display portion 44 is located in the window portion 41, and when an electric leakage occurs, as shown in FIG. As shown in the figure, the arc-shaped portion 44b is configured to be located.
Further, in the present embodiment, a seal 44c of a color different from the color of the display lever 42 itself is affixed to the surface of the arc-shaped portion 44b of the leakage display portion 44.

In the above configuration, when a leakage occurs, as shown by a two-dot chain line in FIG. 10, when the movable iron core 35 is attracted by the fixed iron core 32 and the movable frame 34 rotates in the direction indicated by the arrow C1.
The engagement of the display lever 42 with the movable frame 34 is released. Thereby, the display lever 42 is moved to the flat surface portion 44a.
Rotate in the direction of arrow D until abuts against the inner peripheral edge of the window 41. As a result, as shown in FIG. 11, the arc-shaped surface portion 44 b of the electric leakage display portion 44 of the display lever 42 protrudes from the window 41. Therefore, the operator can determine that the main circuit has been interrupted by the occurrence of the electric leakage by looking at the portion of the display lever 42 located in the window 41, that is, the arc-shaped portion 44b. In particular, in the present embodiment, since the arc-shaped portion 44b is affixed with a seal 44c of a color different from the color of the display lever 42, not only the shape of the portion of the display lever 42 that can be seen from the window 41 but also the color Therefore, it is possible to determine that an electric leakage has occurred, so that erroneous determination can be prevented as much as possible.

The operation of returning the display lever 42 to the normal position is substantially the same as that of the first embodiment. However, in this embodiment, the display lever 42 at the leakage display position is in the normal position. If it is not completely restored to the above, it is configured to return to the leakage display position. This means that the operation protrusion 20a of the slide member 20 is located at an intermediate position between the uppermost position and the lowermost position.
This is because if the handle 2 is not at the normal position, the handle 5 cannot be put into the ON position.

That is, when the leakage is removed while the display lever 42 is at the leakage display position, the movable frame 34 rotates in the direction of the arrow C1, and as shown by the solid line in FIG.
The movable frame 34 is in contact with the left end of the lower end of 2. At this time, the center of the fan-shaped portion 42b is closer than the shaft 42a in FIG.
0, the contact point between the lower end of the display lever 42 and the movable frame 34 is located to the right of the position where the shaft 42a is lowered directly below. Display lever 4
The force P received by the movable frame 34 from the movable frame 34 acts to rotate the display lever 42 in the direction of arrow D. This is the same even when the display lever 42 is at an intermediate position (for example, the position shown in FIG. 11) between the leakage display position and the normal position. Therefore, unless the display lever 42 is completely returned to the normal position and locked on the movable frame 34, the display lever 42 is returned to the leakage display position by the urging force and the force P of the torsion coil spring 43.

Since the configuration other than the above is the same as that of the first embodiment, it is possible to obtain substantially the same operation and effect in the second embodiment as in the first embodiment and the first embodiment. it can.

Further, the sticking of the seal 44c on the arc-shaped surface portion 44b of the leakage display portion 44 may be stopped.
That is, the leakage display may be performed depending on whether the portion of the leakage display portion 44 that is visible from the window 41 is the flat surface portion 44a or the arc surface portion 44b. Further, it is also possible to configure so that the portion of the leakage display portion 44 that is visible from the window portion 41 has the same shape and different colors only in the normal state and when the leakage occurs.

FIGS. 12 and 13 show a third embodiment (corresponding to claim 9) of the present invention, and the differences from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In the third embodiment, the configuration of the slide member and the leakage display mechanism is the first.
Is different from the embodiment. That is, instead of the slide member 20, a slide member 51 is provided at the rear of the movable frame 34 in FIG.
Is attached. A portion of the slide member 51 located above the movable frame 34 is provided with an inclined protrusion 51a having a configuration in which the tip end is inclined downward from the right side to the left side in FIG. The slide member 51 has an operation protrusion (not shown) and an engagement protrusion 51b at portions corresponding to the slide member 20 shown in the first embodiment.
Is provided.

On the other hand, a window 52 is formed on the upper surface of the third case 18. The third case 18
A lever housing 53 is provided on the upper left side of the inside, and a display lever 54 is housed therein so as to be slidable in the left-right direction. Note that a pair of guide members 55 for guiding the slide movement of the display lever 54 is provided on the right side of the lever housing 53. A coil spring 56 as an elastic member is disposed between the left end of the display lever 54 and the third case 18, and the display spring 54 is biased rightward by the coil spring 56. Have been.

Further, a projection 54a is provided at a substantially central portion of the upper surface of the display lever 54 in the left-right direction. The projection 54a is disposed in the window 52. Further, a concave portion 54b is provided on the lower surface of the display lever 54. Normal (state shown in FIG. 12)
The inclined projection 51a of the slide member 51 is inserted into the recess 54b. This prevents the display lever 54 from moving rightward. At this time, the protrusion 54a is located in the window 52 at the left end in FIG. A seal 57 of a color different from the color of the display lever 54 itself is attached to a portion of the upper surface of the display lever 54 on the left side of the protrusion 54a.

In the above configuration, when an electric leakage occurs, the movable core 35
Is attracted to the fixed iron core 32, and the movable frame 34
When rotated in one direction, the slide member 51 moves downward, and the inclined protrusion 51a comes out of the recess 54b.
Therefore, the display lever 54 moves rightward by the urging force of the coil spring 56 until the projection 54a comes into contact with the right end in the window 52 (the state shown in FIG. 13). As a result, the seal 57 affixed to the display lever 54 from the window 52
Can be seen, so that the worker can know whether or not leakage has occurred.

Since the configuration other than the above is substantially the same as that of the first embodiment, the same operation and effect as in the first embodiment can be obtained in this embodiment.

In the above-described embodiment, a seal 57 is attached to a portion of the upper surface of the display lever 54 on the left side of the protrusion 54a, and an electric leakage is caused by the color of the portion of the display lever 54 visible from the window 52. Although the presence / absence of the occurrence of the leakage is displayed, the presence / absence of the occurrence of the earth leakage may be displayed simply by changing the position of the projection 54a in the window 52.

Further, the present invention is not limited to the above-described embodiment, and for example, the following modifications are possible.
Although the operation protrusion of the slide member is configured to trip the opening / closing mechanism by rotating the trip lever, it is configured to rotate a member other than the trip lever, such as a member for rotating the trip lever. May be. Further, the actuator may be configured by a member that rotates in accordance with the rotation of the movable iron core.

[0055]

As is apparent from the above description, the present invention provides a main circuit interrupter which is housed in a first case and has an opening / closing mechanism for shutting off the main circuit when an overcurrent flows in the main circuit. A leakage detection unit housed in a second case coupled to the first case, the leakage detection unit including: a leakage detection unit configured to detect occurrence of leakage and output a leakage detection signal; Housed in a third case to be joined,
An earth leakage trip unit that trips the switching mechanism based on the earth leakage detection signal and an earth leakage trip unit that includes an earth leakage display mechanism that displays an earth leakage in conjunction with the earth leakage trip mechanism. The second case and the third case are configured to be detachable from the first case, respectively, and when the second and third cases are removed from the first case, the main circuit interrupting unit is wired. The circuit breaker can be used as a circuit breaker, so that a small earth leakage circuit breaker in the market can be configured using the structure of the wiring circuit breaker as it is, standardizing parts and reducing manufacturing costs. be able to. Moreover,
By providing an earth leakage display mechanism in the earth leakage trip unit, it is possible to determine whether the main circuit was interrupted due to overcurrent or leakage, and quickly remove the cause of the main circuit interruption. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a plan view of an earth leakage breaker showing a first embodiment of the present invention.

FIG. 2 is a perspective view of an earth leakage circuit breaker in a state where an earth leakage detection unit and an earth leakage trip unit are removed from a main circuit interruption unit.

FIG. 3 is a diagram showing an internal configuration of a leakage detection unit.

FIG. 4 is a perspective view of the third case with the right case removed, as viewed from the mounting surface side of the earth leakage trip unit to the main circuit interruption unit.

FIG. 5 is a perspective view showing a state in which a right case is removed from the third case, and shows an inside of a ground fault trip unit.

FIG. 6 is a diagram showing a part of the internal configuration of the main circuit cutoff unit and the internal configuration of the earth leakage trip unit.

FIG. 7 is a diagram schematically showing an internal state of the earth leakage trip unit in a normal state.

FIG. 8 is a diagram schematically showing an internal state of the earth leakage trip unit in an earth leakage occurrence state.

FIG. 9 is a view corresponding to FIG. 7, showing a second embodiment of the present invention.

10 is a diagram corresponding to FIG.

FIG. 11 is a diagram showing a state where the display lever is at an intermediate position between the normal position and the earth leakage display position.

FIG. 12 is a view corresponding to FIG. 7, showing a third embodiment of the present invention.

13 is a diagram corresponding to FIG.

[Explanation of symbols]

In the figure, 1 is a main circuit cutoff unit, 2 is a leakage detection unit, 3 is a leakage trip unit, 4 is a first case, 7a
7c is a load side terminal, 11 is a second case, 12a to 1
2c is a main circuit conductor, 15 is a zero-phase current transformer (leakage detection means), 16 is a leakage detection circuit (leakage detection means), 18 is a third case, and 20 and 51 are sliding members (actuator, leakage tripping). Mechanism), 21a, 21b are engaging projections (engaging members), 22a, 22b, 24 are engaging concave portions (engaged portions), 23 is an engaging member, 25 is a coil spring (elastic member), 28, 41 and 52 are windows, 29, 42 and 54 are display levers (leakage display mechanism), 31 is a coil (leakage release mechanism), 32 is a fixed iron core (leakage release mechanism), and 33 is an electromagnet (leakage release mechanism). ) And 35 are movable iron cores (leakage tripping mechanism), 36 is a coil spring (biasing means), 38 and 43 are torsion coil springs (elastic members), and 56 is a coil spring (elastic member).

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Eiji Kanamori 2121, Nao, Asahimachi, Mie-gun, Mie Prefecture Inside the Mie Plant, Toshiba Corporation (72) Inventor Ryuji Kikuchi 2121, Ozai, Asahi-machi, Mie-gun, Mie Prefecture F-term in Toshiba Mie Plant (reference) 5G004 AA01 AB02 BA01 BA03 BA04 CA02 DA01 GA01 5G030 CA03 FC08 FE29 XX07 YY01 YY13

Claims (9)

[Claims] A main circuit shutoff unit housed in a first case and provided with an opening / closing mechanism for shutting off the main circuit when an overcurrent flows in the main circuit; A leakage detection unit that is housed in a second case, and is provided with a leakage detection unit that detects the occurrence of leakage and outputs a leakage detection signal; and a leakage detection unit that is housed in a third case coupled to the first case. A ground fault trip unit comprising a ground fault tripping mechanism that trips and operates the opening / closing mechanism based on the detection signal, and a ground fault tripping mechanism that displays a ground fault in conjunction with the ground trip mechanism; The earth leakage breaker, wherein the case and the third case are each configured to be detachable from the first case. A first case provided with a load-side terminal, and a main circuit conductor connected to the load-side terminal provided on the second case so as to protrude outward from the second case. The earth leakage breaker according to claim 1, wherein the second case is coupled to the first case by connecting the main circuit conductor to the load-side terminal. 3. The third case includes an engaging member that engages with a predetermined engaged portion of the first case, and an elastic member that holds the engaging state of the engaging member. The earth leakage breaker according to claim 1 or 2, wherein 4. An earth leakage trip mechanism comprising: an electromagnet including a fixed core and a coil wound around the fixed core; and a movable core rotatably arranged to face an end of the fixed core. An urging means for urging the movable iron core away from the fixed iron core; and an actuator interlocking with the turning operation of the movable iron core. The electric leakage detecting means comprises an operating voltage of the coil as an electric leakage detection signal. The actuator is configured to trip the opening / closing mechanism when the movable iron core is attracted to the fixed iron core. 3. The earth leakage breaker according to 2. 5. The earth leakage breaker according to claim 4, wherein the actuator comprises a slide member that slides in accordance with the turning operation of the movable iron core. 6. The third case has a window for displaying an electric leakage, and the electric leakage display mechanism is rotatably provided in the third case, and a display lever partially located in the window. And an elastic member for urging the display lever to rotate in one direction. The display lever is normally locked to a movable core or a member that rotates integrally with the movable core, and When the iron core is attracted to the fixed iron core, the engagement of the display lever with the movable iron core or the member is released and the display lever is rotated to change the amount of projection of a part of the display lever from the inside of the window. The earth leakage breaker according to claim 4, wherein the earth leakage breaker is configured. 7. The third case has a window for displaying an electric leakage, and the electric leakage display mechanism is rotatably provided in the third case, and a display lever partially located in the window. And an elastic member for urging the display lever to rotate in one direction. The display lever is normally locked to a movable core or a member that rotates integrally with the movable core, and When the iron core is attracted to the fixed iron core, the display lever is unlocked from the movable iron core or the member and is rotated so that a portion located in the window portion changes. The earth leakage breaker according to claim 4, wherein 8. The earth leakage breaker according to claim 7, wherein a color of a portion located in a window portion of the display lever is different before and after the movable core is attracted to the fixed core. 9. The third case has a window for leakage display, and the leakage display mechanism includes a display lever slidably provided in the third case and a part of which is located in the window. An elastic member that urges the display lever to slide in one direction. The display lever is normally locked by a slide member, and the slide member is pulled when the movable core is attracted to a fixed core. The position of a part of the display lever in the window portion is changed by releasing the engagement with and sliding the display lever.
The earth leakage breaker as described.