JP2002197961A - Earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth leakage breaker which allows easy distinction of a leakage condition from normal condition and whose test button can easily be accommodated in the breaker body. SOLUTION: An electromagnetic releasing device 9 is installed nearer the front within a breaker body 1 in such an arrangement that a leak display member 100 faces a window 40 formed on the front face of the breaker body 1 and a movable contact plate 97 is installed at the front face of the body 1 so that it is easy to push in. Because the leakage displaying member 100 is located opposite the test button 42 in such a way as interposing a coil frame 91, the member 100 does not obstruct the test button 42, and it 42 can easily be accommodated in the body 1. Also because the member 100 moving between the leak display position and non-leak display position is arranged facing the window 40, the normal condition and leaking condition can be distinguished from each other easily owing to the member 100 visible through the window 40.

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 having a function of detecting an earth leakage current such as a leakage current or a ground fault current flowing in a distribution line to interrupt an electric circuit and to indicate an interruption state of the electric circuit. It is.

[0002]

2. Description of the Related Art In general, this type of earth leakage breaker includes a test switch for flowing a pseudo earth leakage current for testing an electric circuit breaking operation by detecting an earth leakage current, and a protruding and retractable push-and-pull to an upper surface of a body. A test button that turns on the test switch during operation and causes a pseudo leakage current to flow, and a leakage display member that protrudes from the upper surface of the body and displays a leakage state (circuit interruption state) when the electric circuit is cut off by detecting the leakage current Have been.

Here, since the leakage display member has a structure protruding from the upper surface of the body when a leakage occurs, it is difficult to determine whether the leakage display member is protruding from a place slightly away from the body. There is a problem that it is difficult to distinguish between the normal state and the earth leakage state.

[0004] On the other hand, there has been proposed a configuration in which a leakage display member is slid when an electric leakage occurs and a leakage state is displayed by exposing the leakage display member to the outside through a window opening in the upper surface of the housing. (Actual opening 53-1153
No. 74).

[0005]

However, in the conventional example described in the above-mentioned publication, a leakage display member is disposed above a plunger attracted by a coil excited by leakage detection. However, there has been a problem that it is difficult to secure a storage space for a test button disposed on the side where the plunger of the coil appears and disappears.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an earth leakage circuit breaker in which a normal state and an earth leakage state can be easily distinguished and a test button can be easily stored in a body. To provide.

[0007]

According to a first aspect of the present invention, there is provided a zero-phase current transformer for detecting a leakage current flowing through an electric circuit, and a current supplied by an output of the zero-phase current transformer. And a coil frame formed in a tubular shape opened at both ends and wound around the outside of the coil. The coil is inserted into the coil frame so as to be freely protruded and retracted. A plunger that is sucked into the frame, a breaking mechanism that opens a contact interposed in the electric circuit when the plunger is sucked to cut off the electric circuit, and a path that flows a pseudo leakage current to the zero-phase current transformer. A test switch, a test button for turning on and off the test switch, a leakage display member that moves between a leakage display position and a non-leak display position in conjunction with the plunger, and a leakage display member at least at the leakage display position is externally provided. Coming A test button is disposed on the surface of the container body where the window hole opens, at a position opposite to the window hole with the coil frame interposed therebetween. A connection portion protruding from the opening on the end side is provided on the electric leakage display member, and when an electric leakage occurs, the electric leakage display member moved to the electric leakage display position can be visually recognized through the window hole of the container, so that it is in a normal state. It is easy to distinguish it from the leakage state, and the leakage display member is located on the opposite side of the test button across the coil frame, so that the leakage display member does not interfere with the test button and the test button is stored in the body. It will be easier.

According to a second aspect of the present invention, in the first aspect of the present invention, the leakage display member is formed by folding back in a direction facing the connecting portion, and the moving range of the leakage display member is set closer to the coil frame. The body can be reduced in size.

A third aspect of the present invention is characterized in that, in the first or second aspect of the invention, the leakage display member is formed of a non-magnetic material, and the magnetic attraction of the excited coil does not act on the leakage display member. Thus, the leakage indicating member can be moved smoothly.

[0010] The invention of claim 4 is the invention of claim 1 or 2 or 3.
And a substantially U-shaped yoke disposed so as to sandwich the coil frame from both ends by the side pieces, and the side piece of the yoke is moved to the end of the plunger through an opening at the other end of the coil frame from which the connecting portion protrudes. The suction force is increased so that the plunger and the leakage indicating member can be reliably moved.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, a leakage preventing member is provided on the earth leakage display member to abut against the end of the coil frame to prevent the plunger from coming off from the coil frame when the coil is not excited. Since the yoke is not involved in preventing the plunger from coming off from the coil frame, unnecessary force does not work when the plunger is moved in the anti-suction direction, and the plunger can be easily moved.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the return spring for urging the plunger in the anti-suction direction is operated in conjunction with the shut-off mechanism, so that the suction is performed inside the coil frame. A stopper member that engages with the plunger, restricts movement of the plunger in the anti-suction direction, and releases the engagement with the plunger at the time of resetting when the interruption of the electric circuit by the interruption mechanism is stopped and the contacts are closed. In the event of leakage, the leakage display member at the leakage display position can be stopped in a state facing the window hole in order to restrict movement of the plunger in the anti-suction direction by the stopper member when leakage occurs. At the time of reset, the engagement between the stopper member and the plunger is released, so that the plunger returns to the original position by the spring force of the return spring, and the leakage display member returns to the non-leakage display position. It can be dynamic. as a result,
The normal state and the earth leakage state can be displayed more reliably.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The present embodiment is used for a main switch of a distribution board for a house, and has a container 1 made of a synthetic resin and formed in a rectangular parallelepiped shape. A terminal block 30 is provided at the upper end of the body 1.
Are formed on the terminal block 30, respectively.
Three input terminals consisting of screw terminals with
3, 3 are arranged side by side in the left-right direction.
Is connected to a single-phase three-wire neutral wire.
3 is connected to a voltage line. An insulating wall 35 is formed on the terminal block 30 to insulate between the adjacent input terminals 3. As shown in FIG. 2, the terminal mounting portion 10 continuously and integrally protrudes upward from the right end of the upper end portion of the body 1, and three output terminals 4, 4, 4 from the right side surface of the terminal mounting portion 10. They are arranged in a projecting manner. Thus, the input terminals 3,
The output terminals 4, 3, and 4 are associated with each other on a one-to-one basis, and the input terminals 3, 3, and 3 are respectively connected to voltage and neutral wire conductors (not shown). , Output terminal 4,
Conductive bars (not shown) serving as busbars are respectively connected to the terminals 4 and 4 using terminal screws. A storage portion 15 for storing the connection wire 7 described later is formed inside the terminal mounting portion 10, and the storage portion 15 and the terminal block 30 are separated by a partition wall 27.

As shown in FIG.
Three contact portions 26, 26, 26 arranged side by side in the width direction (left-right direction in FIG. 3), the opening / closing mechanism portion 5, and the contact portion 2
Zero-phase current transformer C for detecting a leakage current such as a leakage current or a ground fault current flowing in an electric circuit (main circuit) in which 6, 26, 26 are inserted.
T, an electromagnetic release device 9 which is operated by the output of the zero-phase current transformer CT and operates the switching mechanism 5 to forcibly open the contacts 26, 26, 26 when a leakage current flows;
The trip devices 6, 6 for operating the switching mechanism 5 so as to forcibly open the contacts 26, 26, 26 when an abnormal current such as a short circuit current or an overcurrent flows in the electric circuit are housed. The three-pole contact portions 26, 26, 26 can be opened and closed by a single handle 2 exposed on the front surface of the body 1.

Here, the body 1 is a body 1 having an open front surface.
a and a cover 1b covered on the front side of the body 1a. An insulating wall 28 is formed in the body 1a to divide the internal space for each pole, so as to achieve insulation between adjacent contact portions 26.

The contact portion 26 is fixed to the distal ends of L-shaped contact holding pieces 33, 33, 33 extending from the lower edges of the terminal plates 31, 31, of the input terminals 3, 3, 3. The fixed contacts 21, 21, 21 and the movable contact 22, which is fixed to one end of the strip-shaped movable contacts 25, 25, 25 made of conductive metal in the longitudinal direction, and comes into contact with and separates from the fixed contacts 21, 21, 21. , 22 and 22. Here, the movable contacts 25, 25 corresponding to the input terminals 3, 3 on both sides connected to the voltage line, respectively, are connected to the above-mentioned input terminals via the tripping devices 6, 6, and the connecting wires 7, 7, respectively, which are covered wires. The movable contact 27 connected to the output terminals 4 and 4 corresponding to the input terminals 3 and 3 and corresponding to the central input terminal 3 connected to the neutral wire is connected to the output terminal corresponding to the input terminal 3 via the connection line 7. 4 is connected. Further, these connection lines 7, 7, 7 are inserted through the through holes of the toroidal core of the zero-phase current transformer CT housed in the lower part of the case 1, and along the lower surface and the right side inside the case 1. It is routed in an L-shaped storage section 15 formed in the housing 1.

In the center of the front surface of the body 1 (the front surface of the cover 1b), a handle insertion hole 29 which opens in a rectangular shape is formed. A frame 12 having a bearing (not shown) for receiving both ends of the handle shaft 8 that supports the handle 2 is provided near the handle insertion hole 29 inside the body 1. The handle 2 is provided with an operation section 2 a that projects through the handle insertion hole 29 to the front of the body 1. That is, the handle 2 moves the handle shaft 8 between a position where the operation portion 2a is substantially flush with the opening surface of the handle insertion hole 29 and a position where the operation portion 2a protrudes from the handle insertion hole 29 (see FIG. 4). It rotates as a fulcrum and can be raised and lowered freely. A link support 2b projects from a lower surface of the handle 2 housed inside the body 1, and a shaft projection 2 is provided on both lower sides of the link support 2b.
c is protruded. Here, the operation unit 2a and the link support unit 2
b, the protruding directions are set such that they are not in a straight line but in a substantially rectangular shape as shown in FIG. further,
The operating portion 2a of the handle 2 is formed by a handle return spring 16 composed of a scissor-shaped spring mounted around a bearing portion.
It is urged to stand up from the front.

The opening / closing mechanism 5 has a pair of legs connected to each other by a support shaft 11b to form a substantially U-shape, and a handle 2 with respect to a bearing hole 11a formed at the tip of each leg. A handle link 11 through which a shaft projection 2c provided on the handle 1 is inserted, and a frame 1 having one end near the handle 2
2 is rotatably supported, the other end is extended to the movable contact 25 side, and the extended end is a tripping member 6.
Latch plate 1 latched in contact with the tip of leg piece 60b
3, both ends are locked in a groove 27 formed in the front-rear direction (a direction perpendicular to the paper surface of FIG. 3) on the partition 27 and the inner wall surface facing the partition 27 of the body 1. And a movable frame 17 that is housed movably in the front-rear direction.
Here, an arc-shaped curved guide groove 12a is formed in the frame 12 so as to be convex toward the rear of the container body 1.
By inserting the tip of the shaft projection 2c of the handle 2 into a, the movement range of the handle link 11 is restricted. The support shaft 11b of the handle link 11 is in contact with the latch plate 13 and the center front end of the movable frame 17.

As shown in FIG. 8, the movable frame 17 is made of an insulative synthetic resin molded product, and is provided with a locking groove 17 into which the three movable contacts 25, 25, 25 are inserted and locked, respectively.
a are juxtaposed. Here, the movable contacts 25, 25, 25
The portion opposite to the movable contact 22 is locked by a locking piece 18 projecting from the inner bottom surface of the body 1a, and a portion locked by a locking groove 17a of the movable frame 17 and a locking piece. A portion between the end portion and the end portion which is locked by 18 is urged forward of the body 1 by a coil spring 19. This coil spring 19 is
One end is inserted into a projection 20 projecting between the groove 14 on the inner bottom surface of the body 1a and the locking piece 18, and the other end is in contact with the movable contact 25.

The trip plate 60 includes three movable contacts 2.
A base piece 60a disposed along the left-right width direction of the container body 1 so as to straddle 5, 25, 25, a leg piece 60b projecting upward from a substantially lower center portion of the base piece 60a, and a base piece 60a. Partition wall 2
And a driving piece 60c protruding upward from the vicinity of the end on the 7th side and having an engaging projection 60d protruding from the distal end thereof. The shaft projection 6 is supported by a bearing portion (not shown).
It is rotatable around 0e. Here, the tripping plate 60 is urged in a direction (clockwise in FIG. 4) in which the leg piece 60b approaches the latch plate 13 by a tripping plate return spring 61 composed of a scissor spring mounted around the bearing. I have.

As shown in FIG. 4, when the handle 2 is turned so that the operating portion 2a is turned down from the state in which the contact portion 26 is opened (open state), the link support portion 2b moves toward the latch plate 13. 4 and the handle link 11 is pivoted about the shaft projection 2c of the handle 2 as a fulcrum.
Rotate clockwise. With the rotation of the handle link 11, the support shaft 11b of the handle link 11
The movable contact 25 moves rearward by sliding the movable frame 17 rearward (leftward in FIG. 4) while slidingly contacting the movable frame 17 and pushing the movable frame 17 rearward against the spring force of the coil spring 19. When the shaft projection 2c of the handle 2 moves toward the latch plate 13 with respect to a straight line connecting the handle shaft 8 and the support shaft 11b of the handle link 11, the tip of the latch plate 13 is pulled out of the leg 60b of the tripping member 60. The handle 2 is fixed at a position where the operating portion 2 a is substantially flush with the opening surface of the handle insertion hole 29 because the operating portion 2 a is latched by contacting the distal end. At this time, the movable frame 1 is moved by the support shaft 11b of the handle link 11.
7 is pressed backward, so that the locking groove 17a of the movable frame 17 is formed.
The three movable contacts 25, 25, 25 locked to the movable contacts 25 are also pushed rearward, and the movable contacts 22 fixed to the tips of the movable contacts 25 face each other as shown in FIG. Then, the contact portion 26 is brought into contact with the contact portion 21 so that the contact portion 26 is closed (closed state). Contrary to the above description, if the handle 2 is rotated in the direction to raise the operation unit 2a from the closed state shown in FIG. 6, the support shaft 11b of the handle link 11 moves forward, and the spring of the coil spring 19 is moved. Since the movable frame 17 is moved forward by the force, the movable contact 22 is separated from the fixed contact 21 and the contact portion 26 is opened, so that an open state shown in FIG. 4 is obtained.

The opening / closing mechanism 5 configured as described above includes
If leakage current flows in the main circuit in the closed state of the contact portion 26, the electromagnetic release device 9 is activated, and if abnormal current such as short-circuit current or overcurrent flows, the trip devices 6, 6 are activated to trip. When the member 60 is driven, the latched state of the latch plate 13 is released, and the contact portion 26 is forcibly opened. That is, in the present embodiment, the opening and closing mechanism 5
Also serves as a blocking mechanism.

As shown in FIG. 8, the electromagnetic release device 9 is a coil 9 that is energized and excited by the output of the zero-phase current transformer CT.
0, a coil frame 91 formed of an insulating material into a tubular shape having openings at both ends and around which a coil 90 is wound,
The yoke 92 includes a yoke 92 formed in a substantially U-shape that is opened forward (upward in FIG. 8) by a magnetic body, and a plunger 93 that is inserted into and retracted from the coil frame 91. The coil frame 91 is formed in a rectangular cylindrical shape having outer flanges 91a and 91b at both ends in the axial direction, and coil terminals 91c for connecting terminals of the coil 90 to both ends in a direction orthogonal to the axial direction of one outer flange 91b. , 91c are implanted and these terminals 9
1c and 91c are connected to the output terminal of a leakage detection circuit (not shown). The leakage detection circuit amplifies the output of the secondary winding of the zero-phase current transformer CT, and when the amplified output exceeds a predetermined level, energizes the coil between the output terminals to excite the coil 90. Further, below the outer flange 91b of the coil frame 91 (to the right in FIG. 8),
A stopper member insertion hole 9 through which a stopper member 94 described later is movably inserted in the front-rear direction (the vertical direction in FIG. 8).
5a and a fixed contact plate 96 constituting a test switch
And a projection 95 whose inside communicates with the internal cavity of the coil frame 91 and whose end is open is formed integrally with the coil frame 91. A fixed contact plate 96 is supported on the support 95b of the projection 95, and the movable contact plate 9 is formed by bending a strip-shaped conductive member into a substantially elliptical shape.
7 is fixed, and the contact portion 97b at the tip of the movable contact plate 97 and the fixed contact plate 96 oppose each other so as to be able to freely contact and separate. Thus, a test switch is constituted by the fixed contact plate 96 and the movable contact plate 97, and the contact portion 97b of the movable contact plate 97 bent by pressing the test button 42 is fixed contact plate as described later. When the test switch is turned on by contacting with the contact 96, a test circuit (not shown) operates to supply an unbalanced current to the zero-phase current transformer CT, thereby creating a pseudo leakage state.

The stopper member 94 is formed of a synthetic resin in the shape of a rectangular flat plate. The main body 94a has an insertion window 94c through which the plunger 93 is inserted at the center, and the stopper 94 is located rearward (downward in FIG. 8) from a corner at one end of the main body 94a. And an arm portion 94b that is vertically provided and has an engagement protrusion 94d protruding at a distal end portion. A mounting projection 94e is formed to project rearward from an inner peripheral surface of the main body 94a in front of the insertion window 94c. Thus,
The fitting protrusion 94e is fitted and attached to one end of a stopper member return spring 98 made of a coil spring, and the stopper member 94 is inserted into the stopper member insertion hole 95a of the protrusion 95 from the arm 94b side. The other end of the stopper member return spring 98 is engaged with an engagement step 95c formed on the inner wall surface of the insertion hole 95a, and the stopper member return spring 98 is engaged.
The stopper member 94 is urged in the anti-insertion direction by the
Is attached to the protrusion 95.

The plunger 93 is formed by bending a metal plate having magnetism so as to be opened rearward (downward in FIG. 8), and has a substantially U-shaped cross section and a lower surface of the main portion 93a (right end face in FIG. 8). ) Leg pieces 93b, 93b, which open outward in a substantially C-shape, are integrally formed. here,
At the rear end (the lower end in FIG. 8) of one of the leg pieces 93b, a substantially O-shaped driving piece 93c is integrally extended. Thus,
The upper end (left end in FIG. 8) of the main portion 93a inserted into the plunger return spring 99 formed of a coil spring passes through the insertion window 94c of the stopper member 94 attached to the projection 95 from the opening of the projection 95, and the coil. By inserting the plunger 93 into the inside of the frame 91, the plunger 93 can come and go freely through the opening of the projection 95 from the opening on the lower end side of the coil frame 91.
Here, as shown in FIG. 5, the inside of the projection 95 is composed of a large-diameter part on the opening side and a small-diameter part on the coil frame 91 side, and the plunger return spring 99 inserted into the large-diameter part from the opening is a small-diameter part. Of the opening and the leg pieces 93b, 9 of the plunger 93
3b, the plunger 93 is urged by the plunger return spring 99 in the direction opposite to the insertion into the coil frame 91. Further, the stopper member 94 is attached to the main body 9.
The peripheral portion 94f behind the insertion window 94c of 4a is
The third main portion 93a contacts the open edge of the main portion 93a to prevent the main portion 93a from coming out of the stopper member insertion hole 95a.

The yoke 92 is, as shown in FIG.
2a and 92a are outer flanges 91 along the axial direction of the coil 90.
a, 91a is attached to the rear side of the coil frame 91 so as to abut against the coil frame 91. Here, an escape groove 92b for allowing the plunger 93 to escape is formed in the side piece 92a on the lower end side,
The plunger 93 is inserted into the coil frame 91 through the escape groove 92b. The upper side piece 92a is formed so as to cover approximately half of the upper end opening of the coil frame 91, and the upper end of the plunger 93 and the upper side piece 92a of the yoke 92 pass through this opening. It is facing.

A leakage display member 100 is attached to the upper end of the plunger 93 via a connecting portion 101. The leakage display member 100 slides between the leakage display position and the non-leak display position in conjunction with the plunger 93 as described later, and is formed of a non-magnetic material in a rectangular plate shape. Characters (for example, two characters “abnormal”) indicating the state of electric leakage are displayed by an appropriate method such as printing. A substantially L-shaped connecting portion 101 is integrally formed from the center of the upper edge of the leakage display member 100, and the whole of the leakage display member 100 and the connection portion 101 has a substantially U-shape. The connecting portion 101 has a width dimension that can be inserted into the inside of the coil frame 91, and has a plunger 93 at the end.
Are integrally formed. The fixing portion 102 is narrower than the connecting portion 101 and has a forked end formed at two ends.
2a is protruded. On the other hand, the main part 9 of the plunger 93
3, three mounting claws 93d, 93d, 93d for holding the fixing portion 102 in the front-rear direction protrude from an upper edge of the fixing portion 3, and an engaging groove 93e for engaging the engaging claws 102a, 102a of the fixing portion 102. , 93e are formed above the main portion 93a. Thus, as shown in FIG.
Is located in front of the coil frame 91, and the coil frame 91
The fixing portion 102 and the connecting portion 101 are inserted into the inside of the coil frame 91 from the gap between the opening edge on the upper end side and the tip edge of the side piece 92a of the yoke 92, and the mounting claws 93d of the plunger 93,
93d, the fixing portion 102 is held between
The fixing portion 102 is fixed to the plunger 93 in a state where the fixing portions 102 do not come off by engaging the engagement grooves 02e, 102a with the engagement grooves 93e, 93e. As a result, the connecting portion 101 protruding from the opening on the upper end side of the coil frame 91 is folded back to the front side of the coil frame 91 so as to straddle the outer flange 91a, and the leakage display member 100 is arranged substantially parallel to the front surface of the coil frame 91. Will be done. When the plunger 93 moves out of the coil frame 91, the connecting portion 101 comes into contact with the outer flange 91a of the coil frame 91 as shown in FIG.

The movable frame 17 has a stopper 9
4 is formed with a concave groove 17b into which the arm portion 94b is inserted so as to be able to move forward and backward, and the arm portion 94b is formed at the front end of the concave groove 17b.
An engagement projection 17c is formed, which is engaged with the engagement projection 94d at the tip and is prevented from falling off.

The electromagnetic release device 9 configured as described above
As shown in FIG. 1, the electric leakage display member 100 faces the window hole 40 formed on the front surface of the housing 1, and the movable contact plate 97 faces the test button 42 disposed so as to be able to be pushed into the front surface of the housing 1. It is arranged near the front inside the body 1 so as to perform. Since the leakage display member 100 is disposed on the opposite side of the test button 42 with the coil frame 91 interposed therebetween, the leakage display member 100
Does not interfere with the test button 42, and the test button 42
It becomes easy to store in.

Next, the operation of the electromagnetic release device 9 configured as described above will be described. First, in a normal state where no leakage current flows in the main circuit, the unbalanced current does not flow on the secondary side of the zero-phase current transformer CT as shown in FIG.
0, and the coil 90 is not excited, so that the plunger 93 protrudes from the inside of the coil frame 91 by the spring force of the plunger return spring 99, and
Stops at a position where it contacts the outer flange 91 a of the coil frame 91. At this time, the movable frame 17 is pushed down by the handle link 11 and moves backward to close the contact portion 26.
Further, the stopper member 94 is provided with an engagement protrusion 94 of the arm portion 94b.
Since d is engaged with the engaging projection 17c of the movable frame 17, it is pulled backward in accordance with the movement of the movable frame 17.
In this state (normal state), the driving piece 93c of the plunger 93 is inserted into the through hole 60e provided in the base piece 60a of the tripping member 60 so as not to interfere with the tripping member 60. At this time, the leakage display member 100 connected to the plunger 93 by the connection portion 101 is at the lowermost position (non-leakage display position) of the moving range, and the leakage hole is provided in the window hole 40 provided on the front surface of the housing 1. Member 100
9A, that is, a portion where the character indicating the electric leakage state is not written, and a non-electric leakage state (normal state) is displayed through the window hole 40 as shown in FIG. 9A.

On the other hand, a ground fault occurs and the zero-phase current transformer CT
When an unbalanced current flows on the secondary side of the above, the coil 90 of the electromagnetic release device 9 is energized by the output of the leakage detection circuit (not shown). When the coil 90 is excited by energization, an attractive force acts on the plunger 93 so as to reduce the magnetic resistance of the magnetic path passing through the coil 90, the plunger 93, and the yoke 92, and opposes the spring force of the plunger return spring 99. As a result, the plunger 93 is drawn into the coil frame 91 and moves upward. When the plunger 93 moves upward, the driving piece 93c of the plunger 93 is disengaged from the engagement protrusion 6 of the tripping member 60.
An upward force is applied to the drive piece 60c on which the engagement protrusion 60d is protruded by engaging with 0d. The upward force causes the tripping member 60 to rotate counterclockwise in FIG. Is released. Then, the handle link 11, which is no longer supported by the latch plate 13, moves downward (to approach the latch plate 13), and the shaft projection 2 c of the handle 2 is moved from a straight line connecting the handle shaft 8 and the support shaft 11 b of the handle link 11. Since the handle 2 also moves toward the movable frame 17, the handle 2 rotates in the upright direction (clockwise in FIG. 4) by the spring force of the handle return spring 16, and the support shaft 11 b of the handle link 11 moves forward accordingly. . Therefore, the pressing force of the handle link 11 against the movable frame 17 is not applied, and the movable contact 25 and the movable frame 17 also move forward by the spring force of the coil spring 19, and the contact portion 26 is forcibly opened. (Trip) (see FIG. 7). Also,
The forward movement of the movable frame 17 disengages the engagement projection 94d of the arm portion 94b from the engagement projection 17c of the movable frame 17, and the stopper member 94 moves forward by the spring force of the stopper member return spring 98. And the main body 9 of the stopper member 94.
A peripheral portion 94f of the 4a engages with a concave portion 93e formed on the lower end side of the main portion 93a of the plunger 93. At this time,
Leakage display member 1 as plunger 93 moves upward
00 moves to the uppermost end position (leakage display position) of the movement range, and a lower portion of the front surface of the leakage display member 100, that is, a portion on which a character indicating a leakage state is written faces the window hole 40 on the front surface of the housing 1. As shown in FIG. 9 (b), it is displayed through the window hole 40 that an electric leakage is occurring. The window hole 40 is fitted with a lens 41 for enlarging the characters of the leakage display, so that the characters ("abnormal") of the leakage display are easy to see.

Here, if the contact portion 26 is opened, the unbalanced current does not flow to the secondary side of the zero-phase current transformer CT, the power supply from the leakage detecting circuit is stopped, and the coil 90 is not excited, so that the plunger The suction force also does not act on the plunger 93, and the plunger 93 attempts to move downward due to the spring force of the plunger return spring 99. As described above, the peripheral portion 94f of the main body 94a of the stopper member 94 becomes the main portion 93a of the plunger 93.
As shown in FIG. 1, the movement of the plunger 93 causes the stopper member 9 to engage with the concave portion 93e formed on the lower end side.
4 and the leakage display member 100 stops at the leakage display position. When the reset operation for closing the contact portion 26 by operating the handle 2 is performed as described above, the rearward movement of the movable frame 17 causes the engagement projection 94d of the arm portion 94b and the engagement projection of the movable frame 17 to move. The stopper member 9 against the spring force of the stopper member return spring 98.
4 is displaced rearward, the engagement between the peripheral portion 94f of the main body 94a of the stopper member 94 and the concave portion 93e of the plunger 93 is released, and the plunger 93 is moved downward by the spring force of the plunger return spring 99, so that the insertion in FIG. Returns to the state. Thus, when a leakage occurs, the stopper member 94 restricts the movement of the plunger 93 in the anti-suction direction, so that the leakage display member 100 at the leakage display position can be stopped in a state facing the window hole 40. At the time of reset, the engagement between the stopper member 94 and the plunger 93 is released, so that the plunger 93 is released by the spring force of the plunger return spring 99.
Can return to the original position and move the leakage display member 100 to the non-leak display position, so that the normal state and the leakage state can be reliably displayed.

The present embodiment operates as described above to forcibly open the contact portion 26 when an electric leakage occurs, and to display the electric leakage state by the electric leakage display member 100 through the window hole 40 provided on the front surface of the housing 1. In this case, the leakage display member 100 is folded back in a direction facing the connecting portion 101, thereby moving the leakage display member 100 closer to the coil frame 91, thereby reducing the size of the body 1. . Further, by forming the leakage display member 100 from a non-magnetic material, the magnetic attractive force of the excited coil 90 does not act on the leakage display member 100, and the leakage display member 100 can be moved smoothly. Further, since the plunger 93 is prevented from coming off by the connecting portion 101, the yoke 92 does not participate in preventing the plunger 93 from coming off from the coil frame 91, and the plunger 93 is moved in the anti-suction direction by the spring force of the plunger return spring 99. Unnecessary force does not work when moving,
There is an advantage that the movement of the plunger 93 is facilitated.

[0035]

According to the first aspect of the present invention, a zero-phase current transformer for detecting a leakage current flowing in an electric circuit, a coil which is energized and energized by an output of the zero-phase current transformer, and has openings at both ends. A coil frame formed in a cylindrical shape and wound with a coil outside;
The plunger, which is inserted into the coil frame so as to be freely retractable and is sucked into the coil frame from the opening on one end side when the coil is excited, and the contact interposed in the electric circuit when the plunger is sucked are opened to cut off the electric circuit. A shut-off mechanism, a test switch interposed in a path through which a pseudo-leakage current flows through the zero-phase current transformer, a test button for turning the test switch on and off, and interlocking between a leakage display position and a non-leakage display position in conjunction with a plunger. A moving earth leakage display member, comprising a body having a window hole that exposes the earth leakage display member at least at the earth leakage display position, and a window hole sandwiching a coil frame on the body surface where the window hole opens. A test button is provided at the opposite position, and a connection portion that is connected to the plunger and protrudes from the opening at the other end of the coil frame so as to be able to advance and retreat is provided on the leakage display member. Since the leaked display member moved to is visible through the window of the body, it is easy to distinguish between the normal state and the leaked state.Moreover, since the leaked display member is arranged on the opposite side of the test button with the coil frame interposed therebetween. There is an effect that the test button can be easily stored in the body without the leakage display member interfering with the test button.

According to a second aspect of the present invention, in the first aspect of the present invention, since the leakage display member is formed by folding back in a direction facing the connecting portion, the moving range of the leakage display member is brought closer to the coil frame, and the electric leakage display member is formed. There is an effect that the size can be reduced.

According to a third aspect of the present invention, in the first or second aspect of the present invention, since the leakage display member is formed of a non-magnetic material, the magnetic attraction force of the excited coil does not act on the leakage display member, and the leakage display is performed. There is an effect that the member can be moved smoothly.

The invention of claim 4 is the invention of claim 1 or 2 or 3
And a substantially U-shaped yoke disposed so as to sandwich the coil frame from both ends by the side pieces, and the side piece of the yoke is moved to the end of the plunger through an opening at the other end of the coil frame from which the connecting portion protrudes. Therefore, there is an effect that the attraction force is increased and the plunger and the electric leakage display member can be surely moved.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a retaining portion is provided on the electric leakage display member to abut against the end of the coil frame to prevent the plunger from coming off from the coil frame when the coil is not excited. Since the yoke is not involved in preventing the plunger from coming off from the coil frame, unnecessary force does not work when the plunger is moved in the anti-suction direction, so that the plunger can be easily moved.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the return spring for urging the plunger in the anti-suction direction and an interlocking mechanism are operated in cooperation with each other to attract the plunger into the coil frame. A stopper member that engages with the plunger, restricts movement of the plunger in the anti-suction direction, and releases the engagement with the plunger at the time of resetting when the interruption of the electric circuit by the interruption mechanism is stopped and the contacts are closed. Therefore, when a leakage occurs, the stopper member restricts the movement of the plunger in the anti-suction direction, so that the leakage display member at the leakage display position can be stopped in a state facing the window hole. By releasing the engagement between the stopper member and the plunger, the plunger returns to the original position by the spring force of the return spring, and moves the leakage display member to the non-leak display position. Bets can be, there is an effect that it is possible to further reliably view the normal state and the electric leakage state.

[Brief description of the drawings]

FIG. 1 shows the embodiment and is a partially broken side view showing a stable state after an opening / closing mechanism has tripped.

FIG. 2 is a front view of the same.

FIG. 3 is a front view showing a state where the cover is removed.

FIG. 4 is a partially broken side view showing an opened state by operating the handle of the above.

FIG. 5 is a partially broken side view showing an open state by operating the handle of the above.

FIG. 6 is a partially cutaway side view showing the above-mentioned input state.

FIG. 7 is a partially broken side view showing a state immediately after the opening and closing mechanism has tripped.

FIG. 8 is an exploded perspective view of the electromagnetic release device in the same.

9A is a partially omitted front view showing a leakage display member seen from a window hole in a normal state, and FIG. 9B is a partially omitted front view showing a leakage display member seen from a window hole when a leakage occurs. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 5 Opening / closing mechanism part 6 Tripping device 9 Electromagnetic release device 40 Window hole 42 Test button 90 Coil 91 Coil frame 93 Plunger 94 Stopper member 100 Leakage display member 101 Connecting part

Claims (6)

[Claims] 1. A zero-phase current transformer for detecting a leakage current flowing through an electric circuit, a coil energized and energized by an output of the zero-phase current transformer, and a cylindrically formed outer opening at both ends. A coil frame around which a coil is wound, a plunger which is inserted into and retracted from the inside of the coil frame and which is sucked into the coil frame from an opening at one end when the coil is excited, and which is interposed in an electric circuit when the plunger is sucked. A break mechanism that opens the contact and cuts off the electric circuit, a test switch that intervenes in a path that causes a pseudo-leakage current to flow through the zero-phase current transformer, a test button that turns this test switch on and off, and a linkage with the plunger A device having a leakage display member that moves between the leakage display position and the non-leak display position, and a container having a window hole that exposes at least the leakage display member located at the leakage display position, wherein the window hole is open. Carp on the body surface A test button is provided at a position opposite to the window hole with the frame sandwiched therebetween, and a connection portion connected to the plunger and protruding from the opening on the other end side of the coil frame so as to be able to advance and retreat is provided on the earth leakage display member. Characteristic earth leakage breaker. 2. The leakage breaker according to claim 1, wherein the leakage display member is formed by folding back in a direction facing the connecting portion. 3. The earth leakage breaker according to claim 1, wherein the earth leakage display member is formed of a non-magnetic material. 4. A substantially U-shaped yoke disposed so as to sandwich the coil frame from both ends by side pieces, and the side piece of the yoke is connected to the end of the plunger through an opening at the other end side of the coil frame from which the connecting portion protrudes. The earth leakage breaker according to claim 1, 2 or 3, wherein the earth leakage breaker is opposed to the portion. 5. An earth leakage circuit breaker according to claim 4, wherein a leakage prevention member is provided on the earth leakage display member to contact the end of the coil frame to prevent the plunger from coming off from the coil frame when the coil is not excited. . 6. A return spring that urges the plunger in the anti-suction direction, and operates in conjunction with the blocking mechanism to engage the plunger sucked into the coil frame to move the plunger in the anti-suction direction. 6. A stopper member for restricting and interrupting engagement with the plunger at the time of resetting when the interruption of the electric circuit by the interruption mechanism is stopped and the contact is closed. 3. The earth leakage breaker according to 2.