JP2002231118A - Earth leakage breaker with protection against phase interruption - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discriminate forcible opening of a main contact by earth leakage detection and the forcible opening of the main contact by phase interruption detection. SOLUTION: The inside of a case 1 is divided by partitions 28 into three spaces, and a main contact 26 is stored in each space. A first electromagnetic release device 9A and an earth leakage display member 100, and a second electromagnetic release device 9B and a phase interruption display member 110 are arranged in both end spaces (spaces for storing poles connecting with a voltage line), not adjacent, of three spaces formed in the case 1, respectively. As a result, the forcible opening of the main contact 26 by earth leakage detection and the forcible opening of the main contact 26 by phase interruption detection can be easily discriminated.

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 with open-phase protection.

[0002]

2. Description of the Related Art In a conventional earth leakage circuit breaker with phase loss protection, a common electromagnetic release is used in both cases of leakage detection and phase loss detection as described in, for example, Japanese Patent Application Laid-Open No. 5-290687. The opening and closing mechanism was released by the device to forcibly open the main contact. In addition, when a main contact is forcibly opened, a common display member is used to indicate the state of leakage or open phase.

[0003]

However, in the above-mentioned conventional example, the same electromagnetic release device and the same display member are used for leakage and open phase, so that leakage occurs when the main contact is forcibly opened. Or the cause of the loss of phase cannot be determined.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to easily discriminate between forced opening of a main contact due to leakage detection and forced opening of a main contact due to open phase detection. An object of the present invention is to provide an earth leakage breaker with open-phase protection.

[0005]

According to a first aspect of the present invention, there is provided a case for accommodating respective poles of a main circuit in three spaces divided by partition walls.
A handle that is rotatably exposed at least partially from the front of the case, an opening / closing mechanism that opens and closes a main contact of each pole at least according to an operation of the handle, a leak detection unit that detects a leak current flowing through the main circuit, A first electromagnetic release device for releasing the opening and closing mechanism when the leakage current is detected by the detection means and forcibly opening the main contact of each pole; and an open phase detection means for detecting an open phase of the neutral line. A second electromagnetic release device for releasing the open / close mechanism when the open phase detection means detects the open phase and forcibly opening the main contact of each pole; and a first electromagnetic release device for providing the open / close mechanism. A release indicator displaying a state in which the main contacts are opened by releasing the main contact, and an open phase display member displaying a state in which the second electromagnetic release device releases the opening and closing mechanism to open the main contacts, 3
A first electromagnetic release device and a ground fault display member are provided in one of two spaces that are not adjacent to each other, and a second electromagnetic release device and a phase loss display member are provided in the other space. The handle is disposed in the remaining one space interposed between the spaces, so that the forced opening of the main contact due to leakage detection and the forced opening of the main contact due to phase loss detection can be easily determined. Moreover, they are not adjacent 2
Since the first electromagnetic release device and the leakage indicating member are disposed in one of the two spaces and the second electromagnetic release device and the phase-out display member are disposed in the other space, the space in the case can be effectively used. At the same time, the leakage display and the phase loss display can be distinguished at a glance because the leakage display member and the phase loss display member are respectively disposed in the spaces on both sides of the space where the handle is disposed. Further, since the first and second electromagnetic release devices are respectively disposed in two spaces that are not adjacent to each other, it is difficult for the arc generated at each pole to turn around to the adjacent pole when opening the main contact. The insulation is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, two display windows for exposing the earth leakage display member and the open phase display member to the outside are provided in a case substantially perpendicular to the parallel direction of the three poles. It is characterized in that it is opened at substantially the same position on the front surface, and the appearance when viewed from the front surface of the case is improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the opening / closing mechanism includes a latch member for interlocking the opening and closing of the main contact, and a tripping member for latching the latch member with the main contact closed. The second electromagnetic release device comprises: a second electromagnet which is excited when the phase loss is detected by the phase loss detecting means; and a latch member which is moved by the excited second electromagnet to be moved. A second plunger for driving a tripping member to release the latch of the second plunger, and preventing the second plunger driven in a state where the main contact is forcibly opened by the second electromagnetic release device. A second stopper member is provided, and the release member is held at a position where the second plunger does not latch the latch member in a state where the return of the second plunger is prevented by the second stopper member. Characterized by If the main contact is closed by operating the handle when the phase occurs and the load balance is unbalanced, an overvoltage may be applied to the load and the load may be broken. In the state where the return of the second plunger is prevented, the tripping member is held at the position where the latch member is not latched by the second plunger. Therefore, even if the handle is operated, the main contact may be closed. Therefore, it is possible to prevent an overvoltage from being applied to the load.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the second stopper member is operated from outside the case so that the second plunger can be prevented from returning. When the stopper member is operated to release the second plunger from the return inhibition, the trip member can be returned to the position where the latch member is latched, so that the main contact can be closed by operating the handle.

According to a fifth aspect of the present invention, in the third or fourth aspect, the first electromagnetic release device comprises: a first electromagnet which is excited when a leakage current is detected by the leakage detection means;
A first driving means for driving the tripping member to be displaced by the excited first electromagnet to release the latch of the latch member;
And a first stopper member for preventing return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device,
A first engagement having a thickness such that the first engagement is detachably engaged with the first plunger and detached from the first plunger when the return of the first plunger is prevented by the first stopper member; And the second plunger is engaged with the second plunger so that the latch member is not latched when the return of the second plunger is prevented by the second stopper member. And a second engaging portion having an appropriate thickness is provided on the tripping member. The invention according to claim 3 or 4, wherein the thickness of the first and second engaging portions provided on the tripping member is changed only. Since the same action can be achieved, the configuration of the first and second electromagnetic release devices can be shared.

According to a sixth aspect of the present invention, in the third or fourth aspect, the first electromagnetic release device comprises: a first electromagnet which is excited when a leakage current is detected by the leakage detection means;
A first driving means for driving the tripping member to be displaced by the excited first electromagnet to release the latch of the latch member;
And a first stopper member for preventing return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device,
First and second engaging portions respectively engaged with the first and second plungers for releasable engagement and disengagement are provided on the tripping member, and the first plunger and the first plunger are closed when the main contact is closed.
Wherein the distance between the second plunger and the second engaging portion when the main contact is closed is narrowed with respect to the distance between the engaging portions. Since the parts can have the same structure, the space for arranging the first and second electromagnetic release devices and the leakage display member and the open-phase display member is not restricted, and two spaces that are not adjacent to each other can be freely selected. Can be.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, FIGS.
Embodiment 1 of the present invention will be described with reference to FIG.

The present embodiment is used for a main switch of a distribution board for a house, and has a case 1 made of a synthetic resin and formed in a rectangular parallelepiped shape. A terminal block 30 is formed at the upper end of the case 1. Three input terminals 3, 3, 3 each having a screw terminal having a terminal screw 32 are provided on the terminal block 30 in parallel in the left-right direction. In addition, a single-phase three-wire neutral wire is connected to the central input terminal 3, and a voltage wire is connected to the input terminals 3, 3 on both sides. 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 projects upward from the right end of the upper end of the case 1, and the three output terminals 4 from the right side surface of the terminal mounting portion 10.
4, 4 are arranged so as to protrude. Thus, the input terminals 3, 3, 3 are associated with the output terminals 4, 4, 4 on a one-to-one basis. (Not shown) is connected, and a conductive bar (not shown) serving as a bus is connected to each of the output terminals 4, 4, and 4 using terminal screws. A housing 15 for housing a connection wire 7 described later is provided inside the terminal mounting portion 10.
Are formed, and the storage portion 15 and the terminal block 30 are
Is divided by

As shown in FIG. 1, three cases 3 are arranged in the case 1 in the width direction of the case 1 (the left-right direction in FIG. 1).
A zero-phase current detecting means for detecting a leakage current such as a leakage current or a ground fault current flowing through an electric circuit (main circuit) through which the main contacts 26, 26, 26, the switching mechanism 5, and the main contacts 26, 26, 26 are inserted. The current transformer CT and the main contacts 26, 26,
The operation of the first electromagnetic release device 9A that operates the opening / closing mechanism unit 5 so as to forcibly open the electrode 26 and the operation of the first electromagnetic release device 9A according to the detection output of the zero-phase current transformer CT are performed. A leakage protection circuit 50, a second electromagnetic release device 9B for operating the opening / closing mechanism 5 so as to forcibly open the main contacts 26, 26, 26 when a neutral phase is lost; An open-phase protection circuit 51 for detecting an open phase of a sex wire and controlling the operation of the second electromagnetic release device 9B; and a main contact 26 when an abnormal current such as a short-circuit current or an overload current flows in the electric circuit. , 2
Trip devices 6 and 6 for operating the opening and closing mechanism 5 so as to forcibly open the poles 6 and 26 are housed therein, and three-pole main contacts 26 26 and 26 are exposed on the front surface of the case 1. It can be opened and closed by a single handle 2.

Here, the case 1 comprises a body 1a having an open front surface and a cover 1b covered on the front side of the body 1a. A partition 28 is formed in the body 1a to partition the internal space for each pole, and a partition (not shown) is similarly formed in the cover 1b. The case 1 is assembled by connecting the body 1a and the cover 1b. If the body 1
The partition wall 28 on the side a and the partition wall on the side of the cover 1b abut against each other to form three spaces that insulate and house three electric paths including the main contact 26.

The main contacts 26 are fixed to the tips of L-shaped contact holding pieces 33, 33, 33 extending from the lower edges of the terminal plates 31, 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, are respectively connected to the trip devices 6, 6 by connecting wires 7a, 7a made of braided wires, and furthermore, are tripped. Device 6,
Reference numeral 6 is connected to output terminals 4 and 4 corresponding to the input terminals 3 and 3 via connection wires 7b and 7b made of coated electric wires. The movable contact 25 corresponding to the central input terminal 3 connected to the neutral wire is connected to the output terminal 4 corresponding to the input terminal 3 via the connection line 7b. Further, these connection lines 7b, 7b, 7b are inserted into through holes of the toroidal core of the zero-phase current transformer CT housed in the lower part of the case 1 and are formed along the lower surface and the right side surface of the case 1 inside the case 1. It is routed in the L-shaped storage portion 15 formed therein.

At the center of the front of the case 1 (the front of the cover 1b), that is, at a position facing the center of the three spaces formed in the case 1, a handle insertion hole 29 that opens in a rectangular shape is formed. You. Case 1
A frame 12 having a bearing hole 12e for receiving both ends of a handle shaft 8 that supports the handle 2 is provided near the handle insertion hole 29 inside. The frame 12 is formed of a metal plate, and as shown in FIG. 3, a pair of side pieces 12a, 12a having substantially the same shape, a connecting piece 12b connecting the side pieces 12a, 12a at edges, and each side piece 12a, 12a. And a fixing piece 12c protruding outward from the lower edge of the fixing member 12c. Fixing piece 12
A screw hole 12d is formed in c, and the screw hole is fixed to a mounting stand (not shown) protruding from the bottom surface of the body 1a. The handle 2 is made of a synthetic resin and has an operation portion 2a protruding from the front surface of the case 1 through the handle insertion hole 29. A bearing portion 2c for receiving the handle shaft 8 is provided on the back surface of the operation portion 2a. Bearing 2c
Is provided with a link bearing portion 2b protruding downward. The operating portions 2a and the link support portions 2b are set to project from each other so that they are not linear but substantially rectangular. The handle 2 is rotatably attached to the frame 12 by inserting both end portions of the handle shaft 8 inserted into the bearing portion 2c into bearing holes 12e, 12e provided in both side pieces 12a, 12a of the frame 12. Can be That is, the handle 2 is located between a position where the operation portion 2a is substantially flush with an opening surface of the handle insertion hole 29 (see FIG. 6) and a position where the operation portion 2a protrudes from the handle insertion hole 29 (see FIG. 7). With the handle shaft 8 as a fulcrum, it can be turned up and down freely. Here, a handle return spring 16 composed of a scissor-shaped spring is mounted on the outer periphery of the bearing portion 2c of the handle 2,
An engaging piece 16a provided at one end of the handle return spring 16 has a hook groove 12 formed on one side piece 12a of the frame 12.
The handle 2 is urged by the spring force of the handle return spring 16 so that the operating portion 2a stands upright from the front of the case 1.

The opening / closing mechanism 5 includes a handle link 11, a latch plate 13, and a movable frame 17. Handle link 11
Is a pair of substantially strip-shaped leg pieces 11c, 1 as shown in FIG.
1c, a cylindrical drive shaft 11b bridged at the lower ends of the legs 11c, 11c, a connecting piece 11d for connecting the legs 11c, 11c, and a link bearing 2b of the handle 2.
Link bearing holes 11a, 11a into which both ends of the link shaft 36 inserted through the shaft holes are inserted are formed at the upper ends of the legs 11c, 11c. Link bearing holes 11a, 11
a, both ends of the link shaft 36 protruding outside of the leg pieces 11c, 11c from the side pieces 12a, 12a of the frame 12.
The guide grooves 12f, 12f, which are convexly curved downwardly and are formed and locked, are inserted and locked. The movement range of the handle link 11 is regulated by the guide grooves 12f, 12f.

The latch plate 13 has a latch piece 13a formed in a substantially rectangular shape, and a pair of arm pieces 13b, 13b protruding in the same direction from both sides of the upper end of the latch piece 13a.
A substantially semicircular bearing groove 1 is provided at the tip of each of the arms 13b, 13b.
3c, 13c are formed, and shaft projections 12g, 12g projecting from opposite surfaces of both side pieces 12a of the frame 12 are formed.
Is supported by the bearing grooves 13c, 13c, whereby the latch plate 13 is rotatably attached to the frame 12. The drive shaft 11b of the handle link 11 is in contact with the latch plate 13 and the central front end of the movable frame 17 (see FIG. 6).

As shown in FIG. 4, the movable frame 17 is formed of a synthetic resin molded product having an insulating property.
a are arranged side by side, and both ends are locked in a groove 14 formed along the front-rear direction (a direction perpendicular to the paper surface in FIG. 1) on the partition wall 27 of the case 1 and the inner wall surface facing the partition wall 27. Are housed in the case 1 so as to be movable in the front-rear direction (vertical direction in FIG. 6). On the other hand, the movable contact 25,
25, 25, the end opposite to the movable contact 22 is the body 1
a portion which is locked by the locking piece 18 protruding from the inner bottom surface and between the portion locked by the locking groove 17a of the movable frame 17 and the end locked by the locking piece 18 Is the coil spring 19
Urged forward of case 1. One end of the coil spring 19 is inserted into a protrusion 20 that is provided between the groove 14 on the inner bottom surface of the body 1 a and the locking piece 18,
The other end is in contact with the movable contact 25.

The tripping member 60 includes a base piece 60a disposed along the left and right width direction of the case 1 so as to straddle the three movable contacts 25, 25, 25 as shown in FIGS.
A substantially L-shaped leg piece 60b protruding below the substantially central edge of the base piece 60a in the longitudinal direction, and a substantially triangular drive piece protruding laterally from near the longitudinal ends of the base piece 60a. 60
c, 60e, and first and second projections projecting substantially in parallel with the longitudinal direction of the base piece 60a from the distal ends of the driving pieces 60c, 60e.
Are integrally formed of a synthetic resin. In addition, the rotating shaft 3 is provided at the bent portion of the leg piece 60b.
A bearing portion 60g having a bearing hole through which the shaft 7 is inserted is formed. End portions of a rotating shaft 37 protruding from both ends of the bearing portion 60g are inserted into bearing holes 12i, 12i formed in both side pieces 12a of the frame 12. By supporting each, the trip plate 60 is rotatably attached to the frame 12. Here, a tripping member return spring 61 composed of a scissor spring is mounted on the outer periphery of the bearing portion 60g, and a locking piece 61a provided at one end of the tripping member return spring 61 is attached to one side piece of the frame 12. The trip member 60 is urged in a direction (clockwise in FIG. 6) in which the leg piece 60b approaches the latch plate 13 by the spring force of the trip member return spring 61.

As shown in FIG. 7, when the handle 2 is turned so that the operating portion 2a is turned down from the state in which the main contact 26 is opened (open state), the link bearing portion 2b is moved toward the latch plate 13. The handle link 11 rotates clockwise in FIG. 7 around the link shaft 36 as a fulcrum. With the rotation of the handle link 11, the drive shaft 11b of the handle link 11 moves toward the movable contact 25 (downward in FIG. 6) while slidingly contacting the latch piece 13a of the latch plate 13, and the coil spring 19 The movable contact 25 moves downward by pushing the movable frame 17 downward against the spring force. When the link shaft 36 moves to the latch plate 13 side (right side in FIG. 6) with respect to the straight line connecting the handle shaft 8 and the drive shaft 11b of the handle link 11, the lower end of the latch plate 13 is moved to the leg of the tripping member 60. The handle 2 is held at a position where the operating portion 2a is substantially flush with the opening surface of the handle insertion hole 29 because the operating portion 2a is latched in contact with the tip of the piece 60b. At this time, since the movable frame 17 is pressed downward by the drive shaft 11b of the handle link 11, the three movable contacts 25, 25, 25 locked in the locking grooves 17a of the movable frame 17 are also pressed downward. As shown in FIG. 6, the movable contacts 22 fixed to the distal end of each movable contact 25 face the fixed contacts 2 facing each other.
1 and the main contact 26 is closed (closed state). Contrary to the above description, if the handle 2 is turned in the direction of raising the operating portion 2a from the closed state shown in FIG. 6, the drive 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 upward by the force, the movable contact 22 is separated from the fixed contact 21 and the main contact 26 is opened, so that an open state shown in FIG. 7 is obtained. As shown in FIG. 3, the operating portion 2a of the handle 2 is provided with a projection 2d projecting from substantially the center of one end thereof, and the upper end of the latch piece 13a of the latch plate 13 when the main contact 26 is opened. The protrusion 2d abuts on the edge (see FIG. 7), and the rotation of the latch plate 13 is restricted.

The opening / closing mechanism 5 configured as described above includes
If a leakage current flows through the main circuit in the closed state of the main contact 26, the first electromagnetic release device 9A is activated by the operation of the first electromagnetic release device 9A. If an abnormal current such as a current or an overload current flows, the tripping members 60 are driven to drive the tripping member 60 to release the latch state of the latch plate 13 and forcibly open the main contact 26. It works to make it work.

As shown in FIG. 4, the first electromagnetic release device 9A is provided with a first electromagnet which is energized and excited by the output of the leakage protection circuit 50, and is moved and latched by the excited first electromagnet. A first plunger 93A for driving the tripping member 60 to release the latched state of the plate 13. The first electromagnet includes a coil 90 that is energized and energized by the output of the leakage protection circuit 50, and a coil frame 91 that is formed of an insulating material into a cylindrical shape having openings at both ends and around which the coil 90 is wound. The first plunger 93A is inserted into the coil frame 91 so as to be freely retractable. 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 a coil 90 is provided at both ends in a direction orthogonal to the axial direction of one outer flange 91b.
The terminals 91c, 91c for connecting the terminals are implanted, and these terminals 91c, 91c
Connected to 0. In the earth leakage protection circuit 50, as described later, when the output of the secondary winding of the zero-phase current transformer CT exceeds a predetermined level, the coil 90 is energized and excited. Also, the coil frame 9
A protrusion 95 is provided on the right side of the outer flange 91b in FIG. The protrusion 95 has a stopper member insertion hole 95a through which a first stopper member 94A described later is vertically movably inserted, and a support base 95b for supporting a fixed contact plate 96 constituting a test switch.
And the inside communicates with the internal cavity of the coil frame 91 and the end is open. Also, the support 95b of the projection 95
A fixed contact plate 96 is supported, and a base end portion 97a of a movable contact plate 97 formed by bending a strip-shaped conductive member into a substantially O-shape is fixed. 9
7b and the fixed contact plate 96 oppose each other so as to freely contact and separate. Thus, the test switch SW is constituted by the fixed contact plate 96 and the movable contact plate 97.
Contact portion 9 of movable contact plate 97 bent by pressing operation
7b is brought into contact with the fixed contact plate 96 so that the test switch S
When W is turned on, the test circuit 52 operates to operate the zero-phase current transformer CT.
An unbalanced current is passed through to generate a pseudo leakage state.

The first stopper member 94A is formed of a synthetic resin in the shape of a rectangular flat plate, and the first stopper member 94A is located at the center as shown in FIG.
The main body 94a has an insertion window 94c through which the plunger 93A is inserted, and an arm portion 94b that is provided vertically below a corner on one end side of the main body 94a and has an engagement protrusion 94d protruding at a distal end portion. A mounting projection 94e projecting downward in FIG. 4 is formed from the inner peripheral surface of the main body 94a in front of the insertion window 94c. Thus, the mounting projection 94e is fitted and attached to one end of the stopper member return spring 98 made of a coil spring, and the first stopper member 94A is inserted into the stopper member insertion hole 95a of the projection 95 from the side of the arm 94b. Is inserted, the other end of the stopper member return spring 98 is engaged with the engagement step 95c formed on the inner wall surface of the stopper member insertion hole 95a, and the stopper member return spring 98 urges the stopper member 98 in the anti-insertion direction. In this state, the first stopper member 94A is
5 is attached.

The first plunger 93A is formed by bending a metal plate having magnetism to form a main portion 93a having a substantially U-shaped cross section, which opens downward as shown in FIG. 4, and an outer side from the right end surface of the main portion 93a. Leg pieces 93b, 93b that open in a substantially C-shape
Are integrally formed. Here, one leg piece 93b
Is bent into a substantially hook shape, so that a driving piece 93c is integrally formed at the lower end thereof. Thus, the left end of the main portion 93a inserted into the plunger return spring 99 made of a coil spring passes through the insertion window 94c of the first stopper member 94A attached to the projection 95 from the opening of the projection 95. Coil frame 91
, The first plunger 93 </ b> A can freely come and go from the opening on the right end side of the coil frame 91 through the opening of the projection 95. Here, as shown in FIG. 10, the inside of the projection 95 is composed of a large-diameter portion on the opening side and a small-diameter portion on the coil frame 91 side, and the plunger return spring 99 inserted into the large-diameter portion from the opening has a small-diameter portion. Opening edge and first
The plunger 93A is interposed in a compressed state with the leg pieces 93b, 93b of the plunger 93A.
Plunger 93A is urged in the direction opposite to insertion into coil frame 91. Further, the first stopper member 94A is attached to the main body 9.
A peripheral edge portion 94f behind the insertion window 94c of 4a abuts on the open end edge of the main portion 93a of the first plunger 93A, thereby preventing the first plunger 93A from falling 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 first plunger 93A to escape is formed in the right side piece 92a, and the first plunger 93A is inserted into the coil frame 91 through the escape groove 92b. The left end side piece 92a is formed to have a size that covers about half of the opening on the upper end side of the coil frame 91.
The left end of the plunger 93A and the side piece 92a on the left end of the yoke 92 are opposed to each other.

The leakage indicator 100A is attached to the upper end of the first plunger 93A via the connecting portion 101. The electric leakage display member 100 slides between an electric leakage display position and a non-electric leakage display position in conjunction with the first plunger 93A as described later, and is formed of a non-magnetic material in a rectangular plate shape. On the right side, characters indicating the state of electric leakage (for example, two characters of “electric leakage”) are displayed by an appropriate method such as printing. Also, from the center of the left edge of the earth leakage display member 100, a substantially L-shaped connecting portion 10 is formed.
1 are formed integrally, and the whole of the leakage display member 100 and the connecting portion 101 has a substantially U-shape. Connecting part 10
1 is a width dimension that can be inserted inside the coil frame 91,
A fixing portion 1 fixed to the first plunger 93A at the tip
02 are integrally formed. The fixing portion 102 is narrower than the connecting portion 101 and the tip portion is formed in a forked shape.
Engaging claws 102a, 102a protrude from both end edges. On the other hand, three mounting claws 93d, 93d, 93d for holding the fixing portion 102 in the front-rear direction protrude from the left end edge of the main portion 93 of the first plunger 93A, and the engaging claws 102a of the fixing portion 102 , 102a are formed in the upper portion of the main portion 93a.

As shown in FIG. 10, when the leakage indicating member 100 is positioned in front of the coil frame 91, the opening edge on the left end side of the coil frame 91 and the tip edge of the side piece 92a of the yoke 92 are aligned. The fixing portion 102 and the connecting portion 101 are inserted into the coil frame 91 from the gap, and the fixing portion 102 is held between the mounting claws 93d, 93d, 93d of the first plunger 93A, and the engaging claws 102a, 102a are engaged. Grooves 93e, 93
e, the fixing portion 102 is connected to the first plunger 9.
3A is fixed in a retaining state. As a result, the connecting portion 101 protruding from the left end opening of the coil frame 91 is
1a, it is folded back to the front side of the coil frame 91,
The leakage display member 100 is arranged substantially parallel to the front surface of the coil frame 91. However, when the first plunger 93A moves in a direction to get out of the inside of the coil frame 91, as shown in FIG.
1a, the first plunger 93A is prevented from coming off.

As shown in FIG. 4, the second electromagnetic release device 9B and the second stopper member 94B are respectively connected to the first electromagnetic release device 9A and the first stopper member 94A.
Since the configuration is the same as that described above, the same components are denoted by the same reference numerals and description thereof will be omitted. In addition, the phase loss display member 110 has the same configuration as the leakage display member 100, and a second
This slides between the open phase display position and the non-open phase display position in conjunction with the plunger 93B, and is attached to the left end of the second plunger 93B via the connecting portion 111. The phase-loss display member 110 is formed of a nonmagnetic material in a rectangular plate shape, and characters indicating a phase-loss state (for example, two characters of “phase-loss”) are displayed on the right front part by an appropriate method such as printing. I have.

On the other hand, as shown in FIG. 4, the movable frame 17 includes a first stopper member 94A and a second stopper member 9A.
The recesses 17b and 17d into which the arms 94b and 94b of the 4B are inserted so as to be able to move forward and backward respectively are formed.
Engagement projections 17c, 17e are formed at the front ends of the arms 7b, 17d to engage with the engagement projections 94d, 94d at the tips of the arms 94b, 94b.

The first electromagnetic release device 9A and the ground fault display member 100 and the second electromagnetic release device 9B and the phase loss display member 110 configured as described above are formed in the case 1 as shown in FIG. Of the three spaces that are not adjacent to each other (spaces for accommodating the poles connected to the voltage lines). At this time, as shown in FIG. 2, the leakage display member 100 faces the display window 40A formed on the front surface of the case 1, the phase-loss display member 110 faces the display window 40B also formed on the front surface of the case 1, and The movable contact plate 97 that constitutes the test switch SW faces the test button 42 that is disposed so as to be pushed into the front of the case 1. Here, the two display windows 40A and 40B are
In the direction (vertical direction in FIG. 2) substantially perpendicular to the parallel direction of the two poles (the width direction of the case 1), each display window 4 is located at substantially the same position on the front surface of the case 1, that is, from the lower end of the case 1.
Since the openings are provided at positions where the distances to the lower edges of 0A and 40B are substantially equal, the appearance as viewed from the front of the case 1 is improved.

FIG. 5 is a circuit diagram showing a leakage protection circuit 50 for driving the first electromagnetic release device 9A, an open-phase protection circuit 51 for driving the second electromagnetic release device 9B, and a test circuit 52 for the leakage test. ing. In the leakage protection circuit 50, the output of the secondary winding of the zero-phase current transformer CT is converted into a voltage and input to the detection terminal of the leakage protection IC 50a. When the leakage current flows, the input voltage of the detection terminal becomes a predetermined level. Is exceeded, the leakage detection is performed by the leakage protection IC 50a, a leakage detection signal is output from the output terminal, the thyristor SCR1 is turned on by this leakage detection signal, and an exciting current flows through the coil 90 of the first electromagnetic release device 9A. That is, the main contact 26 is opened to protect the load. The test circuit 52 includes a normally open test switch SW, a resistor RT, and a lead wire Lx inserted into a through hole of a toroidal core of the zero-phase current transformer CT between the two input terminals T1 and T2 connected to the voltage poles. When the test switch SW is turned on, a current flows through the lead wire Lx, thereby causing an unbalanced current to flow through the zero-phase current transformer CT to create a pseudo leakage state.

On the other hand, in the open-phase protection circuit 51, the input terminal T
1 and T2 are full-wave rectified by the diode bridge DB and input to the open-phase protection IC 51a, and the detection line Ln from the input terminal T3 connected to the neutral line is connected between the input terminals T1 and T2. Connected voltage dividing resistors R8, R9
, Which is connected to the resistors R5 and R5.
6, R12 and R13 are connected to the detection terminal of the open-phase protection IC 51a. When the power supply and the load are connected normally, the voltage at the detection terminal will appear as a pulsating voltage with a uniform amplitude. When the potential of the detection terminal exceeds a predetermined level, a phase loss detection is performed by the phase loss protection IC 51a, and a phase loss detection signal is output to the output terminal. The thyristor SCR2 is turned on in response to the open-phase detection signal, and an exciting current flows through the coil 90 of the second electromagnetic release device 9B to open the main contact 26 to protect the load. The leakage protection circuit 50, the open-phase protection circuit 51 and the test circuit 52 are connected to a rectangular flat printed circuit board 53 by a leakage protection IC.
It is configured by mounting circuit components such as C50a and open-phase protection IC 51a, and is housed inside the case 1 as shown in FIGS.

Next, the operation of the first electromagnetic release device 9A configured as described above will be described. First, in a normal state where no leakage current flows in the main circuit, the leakage protection circuit 50 supplies current to the coil 90 because no unbalanced current flows on the secondary side of the zero-phase current transformer CT as shown in FIG. And the plunger return spring 99 is not excited.
Of the first plunger 93A by the spring force of the coil frame 9
1 and stops at a position where the connecting portion 101 comes into contact with 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 downward in FIG. 9 to close the main contact 26. Further, the first stopper member 94A is pulled downward in accordance with the movement of the movable frame 17 because the engagement projection 94d of the arm portion 94b is engaged with the engagement projection 17c of the movable frame 17. . In addition,
In this state (normal state), the driving piece 93c of the first plunger 93A is inserted into the concave groove 60h 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 first
Leakage display member 10 connected to plunger 93A
0 is located at one end position (the right end position in FIG. 9) of the movement range which is a non-leakage display position, and a display window 40A provided on the front surface of the case 1 has a front left portion of the leakage display member 100, that is, a leakage. The part where the character indicating the state is not written comes up, and it is displayed through the display window 40A that the state is the non-leakage state (normal state).

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 first electromagnetic release device 9A is energized by the output of the leakage protection circuit 50 as described above. When the coil 90 is excited by energization, an attractive force acts on the first plunger 93A so as to reduce the magnetic resistance of the magnetic path passing through the coil 90, the first plunger 93A, and the yoke 92, and the plunger return spring 99 The first plunger 93A is drawn into the coil frame 91 against the spring force of (1) and moves leftward in FIG. When the first plunger 93A moves to the left, the driving piece 93c of the first plunger 93A engages with the first engaging portion 60d of the tripping member 60, and the first engaging portion 6d.
A leftward force in FIG. 9 is applied to the driving piece 60c provided with 0d protruding. The leftward force causes the tripping member 60 to rotate counterclockwise in FIG. 9 against the spring force of the tripping member return spring 61, and the leg 60 b of the tripping member 60 and the tip end of the latch plate 13 Is released. Then, as shown in FIG. 8, the handle link 11, which is no longer supported by the latch plate 13, moves toward the latch plate 13 (to the right in FIGS. 8 and 9), and the link shaft 36 is connected to the handle shaft 8 and the handle link 11. 8 moves to the movable frame 17 side (left side in FIG. 8) with respect to the straight line connecting the drive shaft 11b with the drive shaft 11b, so that the handle 2 rotates in the upright direction (clockwise in FIG. 8) by the spring force of the handle return spring 16. At the same time, the drive shaft 11b of the handle link 11 moves to the left in FIG. For this reason, 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 upward in FIG. (See FIG. 10). Further, the upward movement of the movable frame 17 disengages the engagement projection 94d of the arm 94b from the engagement projection 17c of the movable frame 17, and the first stopper member is returned by the spring force of the stopper member return spring 98. 94A moves upward, and the peripheral portion 9 of the main body 94a of the first stopper member 94A is moved.
4f engages with a concave groove-shaped engaging portion 93f formed on the lower end side of the main portion 93a of the first plunger 93A. At this time, as the first plunger 93A moves to the right, the leakage display member 100 moves to the other end position (the left end position in FIG. 10) of the movement range that is the leakage display position, and The right side of the front surface of the electric leakage display member 100, that is, the portion where the character indicating the electric leakage state is written faces the display window 40A, and it is displayed through the display window 40A that the electric leakage state is present. The display window 40A is fitted with a lens 41 for enlarging the characters of the leakage display, so that the characters of the leakage display are easy to see.

On the other hand, when the main contact 26 is opened, the unbalanced current does not flow to the secondary side of the zero-phase current transformer CT, the power supply by the leakage protection circuit 50 is stopped, and the coil 90 is not excited. No suction force acts on the plunger 93A, and the first plunger 93A tries to move rightward in FIG. 10 by the spring force of the plunger return spring 99. However, as described above, the main body 94 of the first stopper member 94A is moved.
a of the main portion 93 of the first plunger 93A
aBecause it engages with the engaging portion 93f formed at the lower end side, the movement of the first plunger 93A is restricted to a small distance by the first stopper member 94A as shown in FIG. Stops at the leakage display position.
Here, as described above, when the first plunger 93A moves slightly rightward due to the opening of the main contact 26, the leftward force of the driving piece 93c of the first plunger 93A is applied to the driving piece 60c of the tripping member 60. Therefore, the tripping member 60 is rotated clockwise in FIG. 11 to return to the original position by the spring force of the tripping member return spring 61.
In other words, the thickness (dimension in the diameter direction) t1 of the first engagement portion 60d is set so that the tripping member 60 can return to the original position after the forcible opening of the main contact 26 due to the leakage detection. is there. Thus, by performing the reset operation for closing the main contact 26 by operating the handle 2 as described above,
The downward movement of the movable frame 17 causes the engagement projection 94d of the arm 94b and the engagement projection 17c of the movable frame 17 to engage, and the first stopper member against the spring force of the stopper member return spring 98. The first stopper member 94A moves downward.
A main body 94a and peripheral portion 94f and first plunger 93
A is disengaged from the engagement portion 93f, and the first plunger 93A moves rightward by the spring force of the plunger return spring 99 to return to the closed state in FIG.

Next, the operation of the second electromagnetic release device 9B will be described. First, in the normal state in which the neutral wire is not open, the open-phase protection circuit 51 does not energize the coil 90 as shown in FIG. The second plunger 93B protrudes from the inside of the coil frame 91 due to the force, and stops at a position where the connecting portion 101 comes into contact with the outer flange 91a of the coil frame 91. At this time, the movable frame 17 is
And moves downward in FIG. 12 to close the main contact 26. Further, the second stopper member 94B is configured such that the engagement protrusion 94d of the arm portion 94b is engaged with the engagement protrusion 17 of the movable frame 17.
e, it is pulled downward in accordance with the movement of the movable frame 17. In this state (normal state), the driving piece 93c of the first plunger 93B is inserted into the concave portion 60i provided on the base piece 60a of the tripping member 60 so as not to interfere with the tripping member 60. At this time, the phase missing display member 110 connected to the second plunger 93B by the connecting portion 101 is at one end position (the right end position in FIG. 12) of the movement range that is the non-phase missing display position, and the case 1 Window 40B provided on the front of the camera
The front left portion of the phase-loss display member 110, that is, the portion where the character indicating the phase-loss state is not written faces, and the display window 4
Through 0B, it is displayed that it is in a non-open phase state (normal state).

On the other hand, if the neutral wire loses phase, the coil 90 of the second electromagnetic release device 9B is energized by the output of the phase loss protection circuit 51 as described above. Energized coil 90
Is excited, the coil 90-the second plunger 93B
-Attraction force acts on the second plunger 93B so as to reduce the magnetic resistance of the magnetic path passing through the yoke 92, and the second plunger 9 resists the spring force of the plunger return spring 99.
3B is drawn into the coil frame 91 and moves leftward in FIG. When the second plunger 93B moves to the left, the driving piece 93c of the second plunger 93B engages with the second engaging portion 60f of the tripping member 60 to project the second engaging portion 60f. A leftward force in FIG. 12 is applied to the driving piece 60e. This leftward force causes the tripping member 60 to rotate counterclockwise in FIG. 12 against the spring force of the tripping member return spring 61, and the leg 60 b of the tripping member 60 and the tip of the latch plate 13 Is released. Then, similarly to the case of the first electromagnetic release device 9A, the pressing force on the movable frame 17 by the handle link 11 is not applied, and the movable contact 25 and the movable frame 17 are also moved by the spring force of the coil spring 19 in FIG. And the main contact 26 is forcibly opened (tripped) (see FIG. 13). Further, the upward movement of the movable frame 17 disengages the engagement projection 94d of the arm 94b from the engagement projection 17e of the movable frame 17, and the stopper member return spring 9
The second stopper member 94B is moved upward by the spring force of 8, and the peripheral portion 94f of the main body 94a of the second stopper member 94B is formed in a concave groove formed at the lower end side of the main portion 93a of the second plunger 93B. With the engaging portion 93f. At this time, as the second plunger 93B moves to the right, the phase-loss display member 110 moves to the other end position (the left end position in FIG. 13) of the movement range that is the phase-loss display position,
The right side of the front face of the phase-loss display member 110, that is, the portion where the character indicating the phase-loss state is written, faces the display window 40B on the front surface of the case 1, and it is displayed through the display window 40B that the phase-loss state. In addition, a lens 41 for enlarging the characters of the phase loss display is fitted into the display window 40B, so that the characters of the phase loss display are easy to see.

On the other hand, when the main contact 26 is opened, the energization by the phase loss protection circuit 51 is stopped, the coil 90 is not excited, and the attraction force does not act on the second plunger 93B.
Although the second plunger 93B attempts to move rightward in FIG. 13 due to the spring force of the plunger return spring 99, the peripheral portion 94f of the main body 94a of the second stopper member 94B is moved similarly to the first electromagnetic release device 9A. Engaging part 9 formed on the lower end side of main part 93a of second plunger 93B
Since the second plunger 93B is engaged with 3f, the movement of the second plunger 93B is restricted to a small distance by the second stopper member 94B as shown in FIG. 14, and the phase-loss display member 110 stops at the phase-loss display position. However, even if the second plunger 93B slightly moves rightward due to the opening of the main contact 26 as described above, the leftward force of the driving piece 93c of the second plunger 93B causes the driving piece of the trip member 60 to move. Since it is still acting on 60e, the tripping member 60 cannot return to its original position. In other words, the thickness t2 of the second engaging portion 60f is set so that the tripping member 60 cannot return to the original position after the forcible opening of the main contact 26 due to the phase loss detection (t1). <T2). Therefore, in this case, even if the handle 2 is operated, the engagement protrusion 94d of the arm portion 94b is formed.
And the engaging projection 17e of the movable frame 17 do not engage with each other, and the forced opening of the main contact 26 due to the phase loss detection cannot be reset. That is, when the main contact 26 is closed by operating the handle 2 when the load balance is unbalanced due to the occurrence of phase loss, an overvoltage may be applied to the load and the load may be broken. In the embodiment, the second stopper member 94B
When the return of the second plunger 93B is prevented by the second plunger 93B,
Since the trip member 60 is held at a position where the latch is not latched, the main contact 26 does not close even when the handle 2 is operated, and it is possible to prevent an overvoltage from being applied to the load.

On the other hand, when the main contact 26 is forcibly opened by the second electromagnetic release device 9B, resetting is performed as follows. That is, a thin rod-shaped jig is inserted from the reset hole 43 penetrating the front surface of the case 1 facing the second stopper member 94B, and the tip of the jig presses the upper part of the main body 94a of the second stopper member 94B. By moving the second stopper member 94B downward in FIG. 14 against the spring force of the stopper member return spring 98, the peripheral portion 9 of the main body 94a of the second stopper member 94B can be moved.
4f is disengaged from the engaging portion 93f of the second plunger 93B, the second plunger 93B moves rightward by the spring force of the plunger return spring 99, and the second electromagnetic release device 9B operates normally. Returns to the state. As a result, the leftward force of the driving piece 93c of the second plunger 93B does not act on the driving piece 60e of the tripping member 60, so that the tripping member 60 is moved by the spring force of the tripping member return spring 61 as shown in FIG.
4 and return to the original position as shown in FIG. In this state, if a reset operation for closing the main contact 26 by operating the handle 2 is performed,
The main contact 26 shown in FIG. 12 can be returned to the closed state.

In this embodiment, the first electromagnetic release device 9 is provided in one of two non-adjacent spaces among the three spaces provided in the case 1.
A and the ground fault display member 100 are disposed, and the second electromagnetic release device 9B and the phase loss display member 110 are disposed on the other side, and the handle 2 is disposed in the central space between these two spaces. Therefore, the forced opening of the main contact 26 due to leakage detection and the forced opening of the main contact 26 due to phase loss detection can be easily determined. In addition, the first electromagnetic release device 9A and the earth leakage display member 100 are provided in one of two spaces that are not adjacent to each other, and the second electromagnetic release device 9B and the open phase display member 110 are provided in the other space. The space in the case 1 can be effectively used, and the ground fault display member 100 and the phase loss display member 110 are disposed in the spaces adjacent to the space where the handle 2 is disposed. There is an advantage that the display can be determined at a glance. Furthermore, since the first and second electromagnetic release devices 9A and 9B are respectively disposed in two spaces that are not adjacent to each other, the arc generated at each pole when the main contact 26 is opened is connected to the adjacent pole. There is also an advantage that it is difficult to wrap around and the insulating property is improved.

(Embodiment 2) In Embodiment 1, in order to prevent an erroneous reset due to the operation of the handle 2 after the phase loss protection, the tripping member 60 is provided after the main contact 26 is forcibly opened by the phase loss detection. Second so that it cannot return to the original position
The thickness t2 of the engaging portion 60f is set. as a result,
The first electromagnetic release device 9A and the second electromagnetic release device 9B can have the same configuration, and the cost can be reduced by using common components. On the other hand, in the present embodiment, in order to prevent an erroneous reset due to the operation of the handle 2 after the open-phase protection, a first member provided on the tripping member 60 is provided.
And the second engagement portions 60d and 60f have the same thickness, and the first plunger 93 when the main contact 26 is closed.
The second plunger 93B and the second engagement portion 6 when the main contact 26 is closed with respect to the distance between the first engagement portion 60d and the first engagement portion 60d.
The interval of 0f is narrowed (see FIGS. 16 and 19).

Thus, the first and second engaging portions 60d, 60d
0f and the first and second plungers 93 respectively engaged with
A, 93B drive pieces 93c, 93c are leg pieces 93b, 93
b is bent into a substantially hook shape. For example, by changing the angle at which the leg pieces 93b, 93b are bent, the main portion 93a of the first plunger 93A as shown in FIG. From the base end of the leg piece 93b to be connected,
19, the distance W2 from the base end of the leg piece 93b connected to the main portion 93a of the second plunger 93B to the driving piece 93c is shorter than the distance W1 to the driving piece 93c (W2 <W).
1) Yes. The other components are the same as those in the first embodiment, and the same reference numerals are given to the same components, and the description will be omitted.

That is, the first electromagnetic release device 9A operates in the same manner as in the first embodiment, and after the forcible opening of the main contact 26 due to the leakage detection, the driving piece 93c of the first plunger 93A turns leftward in FIG. Since the force no longer acts on the driving piece 60c of the tripping member 60, the tripping member 60 is rotated clockwise in FIG. 17 by the spring force of the tripping member return spring 61 to return to the original position as shown in FIG. Return to. On the other hand, as for the second electromagnetic release device 9B, FIG.
When the main contact 26 is forcibly opened by detecting the open phase, the energization by the open phase protection circuit 51 is stopped, the coil 90 is not excited, and the attraction force does not act on the second plunger 93B. Although the second plunger 93B tends to move rightward in FIG. 20 by the spring force of 99, the peripheral portion 94f of the main body 94a of the second stopper member 94B is engaged with the second plunger 93B as in the first embodiment. Since the second plunger 93B is engaged with the joint 93f, the movement of the second plunger 93B is restricted to a small distance by the second stopper member 94B as shown in FIG. Then, as described above, the second plunger 9 is opened by opening the main contact 26.
Even if 3B moves slightly to the right, the second plunger 9
The leftward force of the 3B driving piece 93c is applied to the tripping member 60.
, The trip member 60 cannot return to the original position. In other words, after the forcible opening of the main contact 26 due to the detection of the phase loss, the trip member 60 is connected to the main portion 93a of the second plunger 93B such that the trip member 60 cannot return to the original position from the base end of the leg piece 93b. The distance W2 to the driving piece 93c is set. Therefore, in this case, even if the handle 2 is operated, the engagement protrusion 94d of the arm portion 94b and the engagement protrusion 17e of the movable frame 17 are provided.
Does not engage, and the forced opening of the main contact 26 due to the phase loss detection cannot be reset. Therefore, even if the handle 2 is operated, the main contact 26 does not close, and an overvoltage is applied to the load. Can be prevented. Note that the reset procedure of the second electromagnetic release device 9B in the present embodiment is the same as that in the first embodiment, and thus the description is omitted.

Thus, in this embodiment, the first electromagnetic release device 9A and the second electromagnetic release device 9B cannot have the same configuration, but the driving pieces 60c and 60e of the tripping member 60.
Since the first and second engaging portions 60d and 60f provided in the first and second engagement portions 60d and 60f can have the same thickness, the first and second electromagnetic release devices 9A and 9B, the leakage display member 100 and the phase loss display member 110 are provided. Is not restricted, and two non-adjacent spaces can be freely selected. That is, in the first embodiment and the present embodiment, FIG.
In the space to the right of the center space in
The electromagnetic release device 9A and the earth leakage display member 100 are disposed, and the second electromagnetic release device 9B and the phase loss display member 110 are disposed in the space on the left side with respect to the center space. Even if the first electromagnetic release device 9A and the earth leakage display member 100 are provided in the space on the left side and the second electromagnetic release device 9B and the phase loss display member 110 are provided in the right space, the operation is completely the same. You get.

[0046]

According to the first aspect of the present invention, there is provided a case for accommodating the respective poles of the main circuit in three spaces separated by partition walls, a handle at least partially exposed rotatably from the front of the case, An open / close mechanism that opens and closes the main contacts of each pole in response to the operation of the handle, a leak detection means that detects a leak current flowing through the main circuit, and releases the open / close mechanism when the leak current is detected by the leak detection means A first electromagnetic release device for forcibly opening a main contact of each pole, an open phase detecting means for detecting an open phase of a neutral line, and an opening / closing mechanism when an open phase is detected by the open phase detecting means A second electromagnetic release device for releasing the main contact of each pole by forcibly releasing the main contact, and a leakage display member for displaying a state in which the first electromagnetic release device releases the opening / closing mechanism to open the main contact. And the second electromagnetic release device releases the opening / closing mechanism to open the main contact. A first electromagnetic release device and an earth leakage display member in one of two spaces that are not adjacent to each other among the three spaces, and a second electromagnetic release device in the other. Since the device and the phase-loss display member were arranged, and the handle was arranged in the remaining one space between these two spaces, the main contacts were forcibly opened by detecting leakage and the main contacts were forcibly opened by detecting phase-loss. The first electromagnetic release device and the leakage display member are disposed in one of two spaces that are not adjacent to each other, and the second electromagnetic release device and the open phase display member are disposed in the other space. The space inside the case can be used effectively, and the leakage display member and the open-phase display member are placed in the spaces on both sides of the space where the handle is placed. There is an effect that the display and open phase display can be determined at a glance. Further, since the first and second electromagnetic release devices are respectively disposed in two spaces that are not adjacent to each other, it is difficult for the arc generated at each pole to turn around to the adjacent pole when opening the main contact. There is an effect that the insulating property is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the two display windows that expose the leakage display member and the open-phase display member to the outside are provided in a direction substantially orthogonal to the parallel direction of the three poles. Since the opening is provided at substantially the same position on the front surface, the appearance as viewed from the front surface of the case is improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the opening / closing mechanism comprises a latch member for interlocking the opening and closing of the main contact, and a tripping member for latching the latch member with the main contact closed. The second electromagnetic release device comprises: a second electromagnet which is excited when the phase loss is detected by the phase loss detecting means; and a latch member which is moved by the excited second electromagnet to be moved. A second plunger for driving a tripping member to release the latch of the second plunger, and preventing the second plunger driven in a state where the main contact is forcibly opened by the second electromagnetic release device. In the state where the return of the second plunger is blocked by the second stopper member, the tripping member is held at a position where the latch member is not latched by the second plunger. , Phase loss occurs When the load balancing is closing the main contact by operating the handle in a case when it is unbalanced Te, load overvoltage is applied to the load is likely to fail. However, the second
In the state where the return of the second plunger is prevented by the stopper member, the release member is held at the position where the latch member is not latched by the second plunger, so that the main contact is closed even when the handle is operated. There is an effect that overvoltage can be prevented from being applied to the load without being poled.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the second stopper member can be released from the case by operating the second stopper member from outside the case. If the release prevention of the second plunger is released by operating, the tripping member can be returned to the position where the latch member is latched, so that the main contact can be closed by operating the handle.

According to a fifth aspect of the present invention, in the third or fourth aspect, the first electromagnetic release device comprises: a first electromagnet which is excited when a leakage current is detected by the leakage detection means;
A first driving means for driving the tripping member to be displaced by the excited first electromagnet to release the latch of the latch member;
And a first stopper member for preventing return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device,
A first engagement having a thickness such that the first engagement is detachably engaged with the first plunger and detached from the first plunger when the return of the first plunger is prevented by the first stopper member; And the second plunger is engaged with the second plunger so that the latch member is not latched when the return of the second plunger is prevented by the second stopper member. Since the second engaging portion having a large thickness is provided on the tripping member, the same effect as the invention of the third or fourth aspect can be obtained only by changing the thickness of the first and second engaging portions provided on the tripping member. Therefore, the configuration of the first and second electromagnetic release devices can be shared, and there is an effect that cost can be reduced by using common components.

According to a sixth aspect of the present invention, in the third or fourth aspect, the first electromagnetic release device comprises: a first electromagnet which is excited when a leakage current is detected by the leakage detection means;
A first driving means for driving the tripping member to be displaced by the excited first electromagnet to release the latch of the latch member;
And a first stopper member for preventing return of the first plunger driven in a state where the main contact is forcibly opened by the first electromagnetic release device,
First and second engaging portions respectively engaged with the first and second plungers for releasable engagement and disengagement are provided on the tripping member, and the first plunger and the first plunger when the main contact is closed.
Since the distance between the second plunger and the second engaging portion when the main contact is closed is narrowed with respect to the distance between the engaging portions, the first and second engaging portions provided on the tripping member are the same. Therefore, the space for disposing the first and second electromagnetic release devices and the leakage display member and the phase-loss display member is not restricted, and two non-adjacent spaces can be freely selected. effective.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment with a cover removed.

FIG. 2 is a front view of the same.

FIG. 3 is an exploded perspective view in which the opening / closing mechanism is partially omitted.

FIG. 4 is an exploded perspective view of the first and second electromagnetic release devices in the same.

FIG. 5 is a circuit diagram of a leakage protection circuit, an open-phase protection circuit, and a test circuit in the above.

FIG. 6 is a side sectional view when the pole is closed.

FIG. 7 is a side sectional view when the handle is opened by the same handle.

FIG. 8 is a side cross-sectional view immediately before the same forcible opening.

FIG. 9 is a side cross-sectional view when the electrode is closed.

FIG. 10 is a side cross-sectional view at the moment when a forcible opening is performed due to leakage detection in the above.

FIG. 11 is a side cross-sectional view after forcibly opening the electrodes due to the detection of the leakage.

FIG. 12 is a side cross-sectional view when the electrode is closed.

FIG. 13 is a side cross-sectional view at the moment when a forcible opening is performed due to the detection of an open phase according to the first embodiment.

FIG. 14 is a side cross-sectional view after the forcible opening has been performed by the same open phase detection.

FIG. 15 is a side cross-sectional view when the second electromagnetic release device is reset.

FIG. 16 is a side cross-sectional view of Embodiment 2 when the pole is closed.

FIG. 17 is a side cross-sectional view at the moment when a forcible opening is performed due to leakage detection in the above.

FIG. 18 is a side cross-sectional view after forcibly opening the electrodes due to the leakage detection.

FIG. 19 is a side cross-sectional view when the pole is closed in the embodiment.

FIG. 20 is a side cross-sectional view at the moment when the forcible opening is performed by the same open phase detection.

FIG. 21 is a side cross-sectional view after the forcible opening is performed by the open phase detection according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Handle 5 Opening-and-closing mechanism part 9A 1st electromagnetic release device 9B 2nd electromagnetic release device 28 Partition wall 100 Electric leakage display member 110 Open phase display member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G004 AA03 AB02 BA01 BA06 CA02 DA01 DC04 5G030 CA03 FC05 XX18 YY13 5G058 BB01 BB02 BC16 BD11

Claims (6)

[Claims] 1. A case accommodating respective poles of a main circuit in three spaces separated by a partition, a handle at least partially exposed rotatably from a front surface of the case, and at least a part corresponding to operation of the handle. A switching mechanism that opens and closes the main contacts of the poles, a leakage detection unit that detects the leakage current that flows through the main circuit, and releases the switching mechanism when the leakage detection unit detects a leakage current, forcing the main contacts of each pole A first electromagnetic release device that opens a pole, a phase loss detecting means for detecting a phase loss of a neutral line, and an open / close mechanism which is released when the phase loss is detected by the phase loss detecting means to release each pole. Second forcibly opening the main contact
An electromagnetic release device, a first electromagnetic release device that releases the opening and closing mechanism to display a state in which the main contact is opened, and a second electromagnetic release device that releases the opening and closing mechanism to release the main contact. An open-phase display member for displaying an open state, wherein a first electromagnetic release device and a leakage display member are disposed in one of two non-adjacent spaces among the three spaces, and a second is provided in the other. An earth leakage breaker with phase loss protection, comprising an electromagnetic release device and a phase loss display member, and a handle disposed in the remaining one space between the two spaces. 2. The display device according to claim 1, wherein two display windows for exposing the earth leakage display member and the phase loss display member to the outside are respectively opened at substantially the same position on the front surface of the case in a direction substantially orthogonal to the parallel direction of the three poles. The earth leakage circuit breaker with open-phase protection according to claim 1. 3. The opening / closing mechanism includes a latch member interlocked with opening and closing of the main contact, and a tripping member that latches the latch member in a state where the main contact is closed.
A second electromagnet that is excited when the phase loss is detected by the phase loss detecting means, and a tripping member that is moved by the excited second electromagnet to release the latch of the latch member. A second stopper member for preventing return of the second plunger driven in a state where the main contact is forcibly opened by the second electromagnetic release device; and a second plunger. 3. The phase loss according to claim 1, wherein the release member is held at a position where the latch member is not latched by the second plunger in a state where the return of the latch member is prevented by the second stopper member. Earth leakage breaker with protection. 4. The leakage breaker with open-phase protection according to claim 3, wherein the second blocker member can be operated from outside the case to release the second plunger from returning. 5. A first electromagnetic release device, comprising: a first electromagnet which is excited when a leakage current is detected by a leakage detection means; and a first electromagnet which is moved by the excited first electromagnet to form a latch member. A first plunger for driving a tripping member to release a latch, wherein the first plunger is driven in a state where a main contact is forcibly opened by a first electromagnetic release device.
A first stopper member for preventing return of the plunger is engaged with the first plunger such that the first plunger is locked and released, and the first stopper member is prevented from returning by the first stopper member. A first engaging portion having a thickness such that the second plunger is detached from the plunger, and is engaged with the second plunger so that the second plunger can be disengaged, and the second plunger is prevented from returning by the second stopper member. 5. The earth leakage interrupter with phase loss protection according to claim 3, wherein a second engagement portion having a thickness to hold the trip member at a position where the latch member is not latched is provided on the trip member. vessel. 6. A first electromagnetic release device, comprising: a first electromagnet that is excited when a leakage current is detected by a leakage detection means; and a first electromagnet that is moved by the excited first electromagnet to form a latch member. A first plunger for driving a tripping member to release a latch, wherein the first plunger is driven in a state where a main contact is forcibly opened by a first electromagnetic release device.
A first stopper member for preventing return of the plunger is provided, and first and second engaging portions respectively engaged with the first and second plungers for releasable engagement and disengagement are provided on the tripping member. The distance between the second plunger and the second engaging portion when the main contact is closed is narrower than the distance between the first plunger and the first engaging portion when the contact is closed. The earth leakage breaker with open-phase protection according to claim 3 or 4.