JP3232213B2 - Terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device used for electric equipment having a relatively large current capacity.

[0002]

2. Description of the Related Art Conventionally, as a terminal device for connecting an external conductor to an electric device such as a circuit breaker or an earth leakage circuit breaker, a copper-based material mounted on a terminal block of an insulating material has been used. In many cases, a screw hole is formed in a terminal plate, and a terminal screw is screwed into the screw hole.

[0003]

In the case where the above structure is used for a device having a relatively small current capacity,
Since the terminal screws are small and the tightening torque is small, even if the terminal screws are directly screwed to the terminal plate made of a material containing copper as a main component, there is not much problem. However, when the current capacity increases, the terminal screw becomes larger and the outer conductor is required to be in close contact with the terminal plate. Therefore, the tightening torque of the terminal screw increases, and the screw thread formed on the terminal plate by tightening the terminal screw is increased. May be cut. That is, when a terminal screw having a large tightening torque is screwed into a relatively soft terminal plate, the screw thread is cut and the terminal screw cannot be tightened.

[0004] The present invention has been made in view of the above circumstances, and its purpose is to solve the problem even when the current capacity is relatively large.
An object of the present invention is to provide a terminal device capable of tightening a terminal screw with a sufficiently large torque.

[0005]

According to the first aspect of the present invention, in order to achieve the above object, a terminal plate made of a material containing copper as a main component and iron provided on the back side of the terminal plate are provided. A terminal nut made of a material that is the main component, a terminal screw whose tip is screwed into the terminal nut through the terminal plate, and a terminal nut
A retaining groove for detachably holding the stopper is formed
From the bottom of the holding groove, set the inner diameter smaller than the outer diameter of the terminal nut.
The connection hole that penetrates the terminal block in the axial direction of the terminal screw is formed.
A terminal block made of an insulating material formed, wherein the holding groove
Then, on the side where the external conductor is introduced,
An opening sized to allow the
A locking groove is formed on the inner peripheral surface of the mouth and the locking groove is formed.
Is fitted with an elastic cover plate.

[0006]

[0007]

According to the structure of the first aspect of the present invention, a terminal plate made of a material containing copper as a main component and a rear surface of the terminal plate are provided.
A terminal nut made of a material whose main component is iron, a terminal screw whose front end is screwed into the terminal nut through a terminal plate, and a terminal nut which is detachably held in a detent form.
A holding groove is formed.
With a smaller inside diameter and penetrates the terminal block in the axial direction of the terminal screw
And a terminal block made of an insulating material with connection holes
Since provided, will be the terminal plate is held between the head and terminal nut pin screws, it is possible to increase the tightening torque of the terminal screw. That is, the terminal screws can be sufficiently tightened so that the external conductor is sufficiently adhered to the terminal plate, and a large terminal screw having a large tightening torque can be used. It will be suitable for equipment . In addition, the security
Insert the terminal into the holding groove and between the terminal
Form an opening large enough to allow the nut to be
A locking groove is formed on the inner peripheral surface of the
Since the elastic cover plate is attached to the stop groove, the terminal nut
Uses a terminal nut while being detachable from the holding groove
The terminal nut before screwing into the terminal screw.
Can be prevented from dropping from the cover plate. You
In other words, always insert the terminal nut into the holding groove and
The terminal nut prevents the terminal nut from being lost.
Can be stopped. Moreover, it is shaped on the side where the external conductor is introduced.
Terminal nut can be attached and detached from the formed opening
Therefore, if only the cover plate is removed, it is not necessary to remove the terminal plate from the terminal block.
Easy and easy to use studs
can do.

[0008]

[0009]

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following embodiments, examples are shown in which the terminal device of the present invention is used for an earth leakage breaker. This terminal device can be used not only for an earth leakage circuit breaker but also for a circuit breaker for wiring, an electromagnetic contactor, and the like. As shown in FIGS. 4 and 5, the body 10 includes a body 11 and a cover 12 each made of a synthetic resin, and each end of the body 11 in the longitudinal direction has a screw connected to a power source and a load. Terminal block 1 with attached terminals
3a and 13b are formed. In this embodiment, an earth leakage breaker used for single-phase three-wire or three-phase three-wire is shown, and terminals for three poles are provided on each of the terminal blocks 13a and 13b. The terminals of each pole are insulated so as not to contact each other by partition walls 11a that partition the two side walls into three sections at both ends in the longitudinal direction of the body 11.

[0011] Copper exposed end of the power supply formed by guide material shall be the main component side terminal plate 14 to the terminal block 13a, comprising hexagonal hole bolt on the exposed portion of the power source side terminal plate 14 pin The leg of the screw 15a is inserted and the terminal screw 15a is inserted.
A terminal nut 15b (see FIG. 17) formed of a material containing iron as a main component is screwed into the leg portion. As shown in FIG. 6, a positioning piece 14a bent downward is formed at the other end of the power supply side terminal plate 14, and the other end of the power supply side terminal plate 14 is cut and raised so that the power supply side terminal plate 14 is cut and raised. 14
A terminal support piece 14b located below the upper surface of the terminal piece extends from the positioning piece 14a. The opening 14c is formed at the other end of the power supply terminal plate 14 by cutting and raising the power supply terminal plate 14.
The fixed contact 21 is fixed to the upper surface of the terminal support piece 14b exposed through the terminal 4c. A substantially U-shaped support plate 16 that opens upward is disposed on the bottom surface of the body 11, and the terminal support plate 14 b is provided between the two legs of the support plate 16.
Is stored in the body 11 in the form of being placed on the body 11. Supporting piece 16
A positioning projection 11b protruding from the bottom of the body 11
(See FIG. 17), and the positioning piece 14a provided on the power supply side terminal plate 14 is inserted into a positioning recess 11c (see FIG. 17) formed on the bottom of the body 11. As shown in FIG. 1, the power supply side terminal plate 14 is fixed to the body 11 by screwing a fixing screw 19 inserted from the lower surface side of the body 11. It is fixed to the body 11 so as to be sandwiched between the power supply-side terminal plate 14.

On the other hand, one end of a load-side terminal plate 17 made of a conductor material mainly composed of copper is exposed on the terminal block 13b.
7 is a terminal screw 15 made of a hexagon socket bolt at the one end.
a and a terminal nut 15b made of a material containing iron as a main component and screwed to the leg of the terminal screw 15a. The load-side terminal plate 17 is fixed to the body 11 by screwing a fixing screw 19 inserted from the lower surface side of the body 11.

Power supply terminal plate 14 and load side terminal plate 17
As shown in FIGS. 1 and 2, holding grooves 11 d having openings on the outer surface side and the upper surface side of the body 10 are formed in the terminal blocks 13 a and 13 b on which are mounted. A connection hole 11e penetrating the bottom surface of the container 10 is formed on the bottom surface of the holding groove 11d. The inner peripheral surface of the holding groove 11d is formed in a shape capable of preventing rotation of the square-shaped terminal nut 15b having a reduced angle, and the inner diameter of the connection hole 11e is formed smaller than the outer diameter of the terminal nut 15b. Terminal nut 15b has connection hole 1
1e. The holding groove 11
In FIG. 4D, a locking groove 11f is formed on the inner peripheral surface of the opening on the outer surface side of the container body 10, and both ends of the lid 15c formed by bending a band-shaped sheet metal are detachable in the locking groove 11f. It is attached to. The lid 15c has a vertical width approximately equal to the depth of the holding groove 11d, and both ends are bent in a substantially V-shape. The lid 15c is fixed to the holding groove 11d by utilizing the elasticity of the V-shaped portion.

When an external conductor (for example, an electric wire having a terminal having a round connection portion) is connected to the power supply side terminal plate 14 or the load side terminal plate 17 from the side of the body 10, the terminal Attach the nut 15b to the holding groove 11d,
The lid 15c is attached to the holding groove 11d. In this state, when the terminal screw 15a is tightened,
a is screwed into a terminal nut 15b to form a terminal screw 15a.
a and the terminal nut 15b. Here, since the terminal nut 15b is mainly composed of iron, even if the tightening torque of the terminal screw 15a is large, the screw groove of the terminal nut 15b is not cut, and the terminal screw 1b is not cut.
5a can be sufficiently tightened, and the external conductor can be sufficiently adhered to the power supply terminal plate 14 and the load terminal plate 17.

On the other hand, as shown in FIG. 3, a stud (back stud) 9 can be connected to the power supply side terminal plate 14 and the load side terminal plate 17 of this embodiment. Stud 9
Is formed in an octagonal cylindrical shape, and is prevented from rotating when inserted into the connection hole 11e. A thread (not shown) that can be screwed to the tip of the terminal screw 15 a is formed on the inner peripheral surface of the tip of the stud 9. A connection piece 9a is formed on a portion of the stud 9 that is exposed from the container 10, and an external electric wire or the like can be connected to the connection piece 9a.

To connect the stud 9, the lid 15c is removed from the body 10, and the terminal nut 15b is also removed from the body 10. When the stud 9 (mainly composed of copper) is inserted into the connection hole 11e in this state, the stud 9 is connected to the connection hole 11e.
And the terminal screw 15a can be screwed. That is, by attaching the lid 15c,
Loss of the terminal nut 15b when the stud 9 is not connected can be prevented. As described above, since the wiring path of the external conductor can be changed depending on whether or not the stud 9 is used as the external conductor, it can be used in various forms. In addition, despite the fact that relatively soft material mainly composed of copper is used for the power supply side terminal plate 14 and the load side terminal plate 17 to secure conductivity, the terminal nut 15b is mainly composed of iron. By using a screw, the terminal screw 15a can be sufficiently tightened. Here, the terminal screw 15a may be screwed to the power-supply-side terminal plate 14 or the load-side terminal plate 17.

The other end of the load-side terminal plate 17 is connected to one end of a heater plate 22 forming a substantially U-shaped electric path in one plane. Here, the load-side terminal plate 17 and the heater plate 22 are arranged so as to be substantially orthogonal. Further, one end of an indirectly heated bimetal plate 41 is fixed to the other end of the heater plate 22, and the other end of each of the three-pole heater plates 22 has a circuit conductor 23 a,
One ends of 23b and 23c (see FIG. 7) are connected. The intermediate portions of the circuit conductors 23a, 23b, and 23c are inserted into the leakage current detecting device 30 and the other end is connected to one end of the movable contact 25 through the braided wire 24. The other end of the movable contact 25 is provided with a movable contact 26 constituting a contact device together with the fixed contact 21 described above. That is, the power supply side terminal plate 1
4 and a load-side terminal plate 17, a contact device comprising a fixed contact 21 and a movable contact 26, a movable contact 25, a braided wire 24, electric circuit conductors 23a, 23b, 23c, and a heater plate 2
2 is formed.

Incidentally, the heater plate 22 and the load-side terminal plate 1
7, a terminal separating plate 18 made of a magnetic material and having an exhaust hole formed therein is opposed to the heater plate 22 so as to be opposed to the side wall of the body 11 and the partition 11a and between the terminal screw 15a and the partition 11a. Held between each other. Immediately below the terminal separation plate 18 with the load-side terminal plate 17 interposed therebetween, a suction plate 42 formed of a magnetic material in a substantially U-shape that is open upward is disposed. A plunger 43 extending upward is fixed to the suction plate 42, and the suction plate 42 is a return spring 4 composed of a coil spring sandwiched between the suction plate 42 and the load-side terminal plate 17.
4 is urged downward by the spring force. A cutout is formed at the side of the load-side terminal plate 17 at a position where the end surfaces of both leg pieces of the suction plate 42 and the lower end surface of the terminal separation plate 18 face each other. That is, the front end surfaces of both leg pieces of the suction plate 42 and the lower end surface of the terminal separation plate 18 directly face each other.

Therefore, when a current of several tens times or more of the rated current flows in the main circuit, such as a short-circuit current, the terminal separation plate 18 is magnetized by the magnetic field formed around the heater plate 22, and the suction plate is drawn. Reference numeral 42 is attracted to the terminal separation plate 18 against the spring force of the return spring 44. That is, when the short-circuit current flows in the main electric circuit, the suction plate 42 and the plunger 43 move upward. Further, when an overcurrent of several times the rated current flows through the main circuit, the bimetal plate 41 is heated by the heat generated by the heater plate 22, and the bimetal plate 41 is heated.
Is curved in a direction away from the heater plate 22. Here, a push screw 45 is screwed onto the upper end of the bimetal plate 41 so that the amount of screw of the push screw 45 can be adjusted.

A trip device 50 is provided at the center of the body 11.
Is stored. Although a general trip device 50 is used, a brief description will be given. In the trip device 50, as shown in FIG. 17, a latch link 52, a latch plate 53,
Cradle 54 and handle 55 are connected to shafts 52a and 52, respectively.
At 3a, 54a and 55a, it is pivotally connected to the metal frame 51. In addition, the movable contact 2 of the central one of the three poles
Links 5a and 56b to cradle 54
Is pivotally connected, and the other ends of both links 56a and 56b are pivotally mounted. That is, the cradle 54 and the movable contact 25 are connected via the two links 56a and 56b. A latch return spring 57 composed of a torsion coil spring is mounted on the shaft 51a fixed to the frame 51,
One end of the latch return spring 57 is connected to the latch link 5
2 and the latch plate 53. Here, the latch return spring 57 urges the latch plate 53 clockwise around the shaft 53a in FIG. A handle return spring 58, which is a tension spring, is mounted between the handle 55 and the shaft pin 56 on which the links 56a and 56b are mounted.

The movable contact 25 is swingably held in the plane of FIG. 17 with respect to the interlocking body 59 made of synthetic resin, and a contact pressure formed by a coil spring is provided between the movable contact 25 and the interlocking body 59. The spring 46 is held. The contact pressure spring 46 urges the movable contact 25 in a direction to apply a contact pressure when the movable contact 26 closes the fixed contact 21, and is movable when the movable contact 26 opens the fixed contact 21. The movable contact 25 is urged in a direction to separate the contact 26 from the fixed contact 21. The interlocking body 59 has a shaft portion 59a rotatably supported by the body 11, and holds all three-pole movable contacts 25. Accordingly, the other two-pole movable contacts 25 also open and close in conjunction with the opening and closing operations of the one-pole movable contact 25.

On the other hand, an interlocking bar 47 is supported on the body 11 so as to straddle the three poles. In the interlocking bar 47, as shown in FIG. 6, each of the plungers 43 described above has moved upward. When pushed by the plunger 43, the interlocking bar 47
17 are rotated counterclockwise in FIG. 17 around the bearing portion. In addition, bimetal plate 4
The three pressing pieces 47 which are pushed by the push screw 45 screwed to the bimetal plate 41 when the 1 is curved, and rotate the interlocking bar 47 counterclockwise in FIG.
b is projected. Further, the interlocking bar 47 is provided with a set cylinder portion 47c into which a set piece 52b protruding from the latch link 52 is inserted.

The above-described handle 55 protrudes from the upper surface of the body 10 so that it can be turned upside down. When the handle 55 is tilted to the left end as shown in FIG. 17, the movable contact 26 comes into contact with the fixed contact 21 to close the pole. In this state, the set piece 52b of the latch link 52 is inserted into the set cylinder portion 47c of the interlocking bar 47. At this time, since the latch plate 53 is locked by the cradle 54, the force for rotating the latch plate 53 clockwise around the shaft 53a by the spring force of the latch return spring 57 is reduced. The latch link 52 is connected to the latch return spring 5.
17, but stops at the position shown in FIG. 17 by abutting against the upper edge of the latch plate 53. That is, in the state of FIG. 17, the latch plate 53 is kept in contact with the latch link 52. The cradle 54 is also locked to the latch plate 53 to prevent rotation about the shaft 54a. At this time, the spring force of the handle return spring 58 acts in a direction to develop the links 56a and 56b in a straight line, and the movable contact 25 is pushed downward. That is, the movable contact 26 is kept at a position where it contacts the fixed contact 21.

On the other hand, when the handle 55 is tilted rightward as shown in FIG. 18 in a state where the cradle 54 is engaged with the latch plate 53, the upper end of the handle return spring 58 is pivotally connected to the link 56b relative to the cradle 54. Therefore, the links 56a and 56b are bent in a rectangular shape, and the movable contact 25 is pulled upward. That is,
The movable contact 26 opens away from the fixed contact 21.

By the way, the cradle 54 is
Is engaged, the interlocking bar 47 is
19, the set piece 52b of the latch link 52 is pressed by the inner surface of the set tube portion 47c of the interlocking bar 47 and moves downward as shown in FIG. That is, the latch plate 53 is connected to the latch link 5.
As a result, the force for rotating the latch plate 53 clockwise around the shaft 53a is released, and the latch plate 53 rotates clockwise. At this time, Cradle 5
4 is also disengaged from the latch plate 53 and the cradle 54 is released.
Can rotate freely, and the links 56a and 56b are bent by the spring force of the handle return spring 58,
The movable contact 25 is pulled up. That is, the movable contact 26 separates from the fixed contact 21 and opens. Such an operation is generally called a trip operation.

In order to return the latch plate 53 and the cradle 54 from the disengaged state to the engaged state as shown in FIG. 19, the handle 55 may be tilted to the right end. At this time, the cradle 54 is
5b, the latch link 52 rotates clockwise about the shaft 54a, and the latch link 52 is pressed by the handle 55 to rotate counterclockwise about the shaft 52a. That is, if the handle 55 is sufficiently tilted to the right end side, as shown in FIG.
The cradle 54 is engaged with the latch plate 53, and the movable contact 26 returns to the state where the fixed contact 21 is opened.
To close the movable contact 26 with respect to the fixed contact 21,
Thereafter, the handle 55 may be tilted to the left end.

In the trip operation as described above, the plunger 43 moves upward due to the short-circuit current, and the interlocking bar 47 is moved.
The kick piece 47a is pushed upward, or the bimetal plate 41 is bent by an overcurrent, and the push screw 45
This operation is performed when the user presses “b”, activates the leakage current detection device 30 as described later, or presses the trip operation confirmation button 48 provided on the cover 12. The trip operation confirmation button 48 is held by the cover 12, and the trip operation confirmation button 4 is provided by an inclined surface 48a formed at the lower end.
When 8 moves downward, the interlocking bar 47 is rotated counterclockwise around the pivot position. The trip operation confirmation button 48 is urged upward by a button return spring 49 made of a coil spring, and the upper surface of the trip operation confirmation button 48 stops at a position slightly lower than the upper surface of the cover 12.

An arc extinguishing device 60 is provided on the power supply side terminal plate 14. The arc-extinguishing device 60 includes an insulating frame 61 made of a synthetic resin, and a magnetic yoke 62 mounted on the insulating frame 61. The yoke 62 is the power supply side terminal plate 1
4 is formed in a substantially U-shape that is located above the upper surface and that is opened downward. In addition, a plurality of grid pieces 62a are formed on both sides of the yoke 62 such that a gap is formed at a side edge near the terminal screw 15a so as to allow arc gas to pass while shielding the arc. Is extended, and the opening on the left front side of the yoke 62 in FIG. 6 is covered by the grid pieces 62a of both leg pieces. That is, the grid pieces 62a are alternately provided in a staggered manner from the leg pieces in the vertical direction, and are spaced apart from each other in the thickness direction of the grid pieces 62a to form gaps between the grid pieces 62a.

As described above, the terminal support piece 14b provided with the fixed contact 21 in the power supply side terminal plate 14 extends from the positioning piece 14a provided at the right end of the power supply side terminal plate 14, and Because it is located below
When the fixed contact 21 and the movable contact 26 are opened to generate an arc, a magnetic field generated by a current flowing through the power supply terminal plate 14 through the terminal support pieces 14b, the positioning pieces 14a, and the mounting portions of the terminal screws 15a. An electromagnetic force acts between the arc and the arc, and the arc is elongated in the direction of the terminal screw 15a. In addition, since the magnetic field passes through the inside of the yoke 62 above the power-supply-side terminal plate 14, an electromagnetic force for causing the arc to run in the opposite direction does not act. Here, the insulating frame 61 has not only the function of positioning the yoke 62 but also the function of extinguishing the arc efficiently without releasing the pressure applied by the arc gas. An exhaust plate 63 for discharging arc gas to the outside of the housing 10 is provided at a portion corresponding to between the arc extinguishing device 60 and the terminal screw 15a.

Next, the leakage current detecting device 30 will be described. The leakage current detection device 30 drives the trip device 50 by determining an abnormal current when an unbalanced current flows in the main circuit, and as shown in FIGS. 7 to 10, the circuit conductors 23a and 23b , 23c, and a main body 31 having a zero-phase current transformer 32 for detecting that an unbalanced current has flowed, and for rotating the interlocking bar 47 counterclockwise in FIG. 17 when an unbalanced current is detected. And a driving unit 33 provided with a solenoid 34 of the above.

The main body 31 comprises a printed wiring board on which a zero-phase current transformer 32 and electronic components 35 constituting an electronic circuit for detecting an unbalanced current by the secondary output of the zero-phase current transformer 32 are mounted. The circuit board 36 is provided in the sensor case 37. The sensor case 37 is composed of a case body 37a and a case cover 37b, and a coupling claw 38a protruding from the case body 37a is engaged with the coupling hole 38b provided in the case cover 37b so as to form a concave and a convex. Are combined. The zero-phase current transformer 32 is resin-molded and has a positioning projection 32a on the outer peripheral portion. The positioning projection 32a is engaged with the positioning notch 37e on the peripheral portion of the opening window 37d formed on the case cover 37b. Sensor case 3
7 is performed. Similarly to the case cover 37b, an opening window 37c is formed in the case body 37a, and an opening window 36a is also formed in the circuit board 36.
These open windows 36a, 37c, 37d are connected to the zero-phase current transformer 3
2 is formed coaxially with the opening.

The circuit conductors 23a, 23b and 23c are inserted into the opening windows 36a, 37c and 37d. As shown in FIG. 7, each of the circuit conductors 23a, 23b and 23c is bent in a substantially U-shape. You. Further, a pair of insulating separators 81 and 82 made of synthetic resin are attached to the sensor case 37 so that the circuit conductors 23a, 23b and 23c do not come into contact with each other at a portion where the current transformer 32 is inserted. Is done. Each of the insulating separators 81 and 82 includes main plates 81a and 82a facing the outer surface of the sensor case 37 and separating pieces 81b and 82b inserted into the zero-phase current transformer 32 continuously and integrally. Each main piece 8
Mounting projections 81c and 82c having a swelling tip are protruded from the surfaces facing the sensor case 37 in 1a and 82a, and the mounting projections 81c and 82c are pressed into mounting holes 37h provided in the sensor case 37. Thereby, the insulating separators 81 and 82 are fixed to the sensor case 37. That is, the concave / convex engaging means is formed by the mounting projections 81c and 82c and the mounting hole 37h. Separation piece 81 of insulating separator 81
b is formed in a cross-sectional shape in which a pair of U-shapes are back to back and a narrow slit 81d is formed therebetween. The separating piece 82b of the insulating separator 82 is formed in a substantially U-shaped cross section opened downward, and has a shape provided with a protruding piece 82d inserted into the slit 81d of the separating piece 81b on the upper surface of the central piece of the U-shape. It is formed. That is, the two insulating separators 81 and 82 are positioned by the engagement between the slit 81d and the protruding piece 82d. Each of the conductors 23a, 23b, and 23 is provided inside the groove, which is a U-shaped portion of each of the separation pieces 81b and 82b.
c, each of the conductors 23
a, 23b and 23c are insulated from each other.

As shown in FIGS. 11 and 12, a storage recess 37i is formed on the inner surface of the case body 37a, and two magnetic shield plates 85a and 85a made of a magnetic material plate are formed in the storage recess 37i. 85b are arranged. As shown in FIGS. 13 and 14, the magnetic shield plates 85a and 85b
Synthetic resin insulating plate 8 fitted in case body 37a
6 and the case body 37a. Insulating plate 8
6 are provided with engaging claws 8 on the surface facing the case body 37a.
The insulating plate 86 is held by the case body 37a by projecting and protruding the engagement claws 86a into and out of the engagement holes 37j formed in the case body 37a. Further, a positioning portion 85c is formed by cutting and raising the lower edges of the magnetic shield plates 85a and 85b to prevent the magnetic shield plates 85a and 85b from being displaced from each other and to position in the positioning notch 86b provided in the insulating plate 86. By matching the portions 85c, the magnetic shield plates 85a,
85b is prevented from being displaced. Further, reverse assembling notches 85d and 86d are formed at both upper and lower edges of the magnetic shield plates 85a and 85b and the insulating plate 86, respectively, and the reverse assembling preventing protrusions 37k projecting from the inner surface of the case body 37a prevent the reverse assembling. By matching the notches 85d, 86d, the magnetic shield plates 85a, 85b with respect to the case body 37a are formed.
And the reverse assembly of the insulating plate 86 is prevented. Also, the insulating plate 8
6 has a cylindrical portion 86c inserted into the center hole of the zero-phase current transformer 32.
The magnetic shield plates 85a and 85b and the insulating plate 86 are coaxial with the central hole of the zero-phase current transformer 32 and have an opening
5e and 86e are formed.

On the other hand, the driving part 33 is connected to a lid part 37f projecting upward from the case body 37a.
1 is provided. The lid 37f and the sub case 71 are connected to the lid 3
The coupling hole 37g provided in the sub-case 71 and the coupling claw 71a provided in the sub-case 71 are engaged by concave and convex engagement. The sub-case 71 houses a circuit board 73 on which a test switch 72 for performing an operation test is mounted together with the solenoid 34, and a display button 74 protruding from the upper surface of the body 10 when the solenoid 34 is operated. Further, a slide switch 75 for switching the sensitivity for operating the solenoid 34 with respect to the unbalanced current is mounted on the circuit board 73. The display button 74 is connected to the solenoid 34
Can be engaged with the plunger 34a when the plunger 34a protrudes, and in the engaged state, the upper surface of the display button 74 and the upper surface of the body 10 are substantially flush. Further, when the engagement with the plunger 34a is released in the state of engagement with the plunger 34a, the push-up spring 76 pushes the same upward and projects from the upper surface of the container 10. Here, the circuit board 73 is integrated with the circuit board 36 when the electronic component 35 is mounted, as shown in FIG.
After the electronic component 35 is mounted, the electronic component 35 is separated at the position of the sewing line 39 as shown in FIG. 16, and after the separation, the solenoid 34 is mounted.

The test switch 72 includes a contact piece 72 a forming a contact portion and an operation button 7 protruding from the upper surface of the body 10.
When the operation button 72b is pushed into the body 10, the current flows through the test winding 32b wound around the zero-phase current transformer 32 by one turn, and the secondary output is the same as when an unbalanced current is generated. Is generated in the zero-phase current transformer 32. Therefore, if the operation button 72b of the test switch 72 is pressed in a state where the display button 74 is reset to be engaged with the plunger 34a,
A test can be performed to determine whether or not the leakage current detection device 30 functions normally.

The tip of the plunger 34a of the solenoid 34 is inserted into a catching groove 47d provided in the interlocking bar 47,
When the plunger 34a is retracted, the plunger 34
The hooking pin 34b protruding from the front end of the hole a contacts the periphery of the hooking groove 47d to rotate the interlocking bar 47. That is, the pull-in of the plunger 34a also rotates the interlocking bar 47 to operate the trip device 50.

The leakage current detecting device 30 configured as described above is housed in the body 11 with the case body 37a close to the load terminal plate 17. Therefore, the magnetic field generated around the heater plate 22 is reduced by the magnetic shield plates 85a and 85a.
As a result, the effect of the magnetic field on the zero-phase current transformer 32 and the electronic component 35 mounted on the circuit board 36 can be prevented.

[0038]

According to the first aspect of the present invention, there is provided a material mainly composed of copper.
Terminal board made of a material, and disposed on the back side of this terminal board.
A terminal nut made of a material whose main component is iron and a terminal plate
A terminal screw through which the tip is screwed into the terminal nut
A retaining groove that holds the nut detachably in a form that prevents the nut from rotating
Formed and smaller than the outer diameter of the terminal nut from the bottom of the holding groove
Connections with a large inside diameter that penetrate the terminal block in the axial direction of the terminal screw
A terminal block made of an insulating material having a hole formed therein.
Runode, will be the terminal plate is held between the head and terminal nut pin screw, there is an effect that it is possible to increase the tightening torque of the terminal screw. That is, the terminal screws can be sufficiently tightened so that the external conductor is sufficiently adhered to the terminal plate, and a large terminal screw having a large tightening torque can be used. It has the advantage of being suitable for equipment . Further, the holding groove has an end on the side where the external conductor is introduced.
Dimensions that allow terminal nuts to be attached and detached from the child plate
An opening is formed, and a locking groove is formed on the inner peripheral surface of this opening.
And fitted an elastic lid plate in this locking groove
Therefore, while making the terminal nut detachable from the holding groove
When using terminal nuts, the terminal nuts
The cover plate prevents the terminal plate from falling off before screwing.
There is an effect that can be. That is, always
Insert the child nut into the holding groove and attach the cover plate to the terminal block.
By doing so, the terminal nut can be prevented from being lost.
You. Moreover, through the opening formed on the side where the external conductor is introduced
The terminal nut can be attached and detached, so only the lid plate is
Easy to stud without removing terminal board from terminal block
Can be changed between specifications that use
You.

[0039]

[0040]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a sectional view showing a usage example of the embodiment.

FIG. 4 is an exploded perspective view of the embodiment.

FIG. 5 is a perspective view of the embodiment.

FIG. 6 is an exploded perspective view of a main part of the embodiment.

FIG. 7 is an exploded perspective view of a main part of the embodiment.

FIG. 8 is an exploded perspective view of a main part of the embodiment.

FIG. 9 is a front view of a main part of the embodiment.

FIG. 10 is a side view of a main part of the embodiment.

FIG. 11 is an exploded perspective view of a main part of the embodiment.

FIG. 12 is an exploded perspective view of a main part of the embodiment.

FIG. 13 is a horizontal sectional view of a main part of the embodiment.

FIG. 14 is a vertical sectional view of a main part of the embodiment.

FIG. 15 is a perspective view showing a state where components are mounted on a circuit board used in the example.

FIG. 16 is a rear view of a state in which the circuit board used in the example is separated after component mounting.

FIG. 17 is a sectional view of the embodiment in a closed state.

FIG. 18 is a sectional view of the embodiment in an opened state.

FIG. 19 is a cross-sectional view showing a state immediately after the trip operation of the embodiment.

[Explanation of symbols]

 11d Holding groove 11e Connection hole 13a, 13b Terminal block 14 Power supply side terminal plate 15a Terminal screw 15b Terminal nut 15c Cover plate 17 Load side terminal plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuharu Sonoda, Mie Pref., Mie Pref., 564, Ota, Mie Metal Industry Co., Ltd. (72) Inventor Kazuki Tanaka, Mie Pref. Inside Industrial Co., Ltd. (56) References: Japanese Utility Model 57-176046 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 4/38

Claims (1)

(57) [Claims] 1. A terminal plate made of a material containing copper as a main component, a terminal nut made of a material containing iron as a main component disposed on a back side of the terminal plate, and a terminal nut passing through the terminal plate and having a tip end portion. Terminal screw and terminal nut
The holding groove is formed to hold
Terminal with an inner diameter smaller than the outer diameter of the terminal nut from the bottom
A connection hole was formed through the base in the axial direction of the terminal screw.
A terminal block made of an insulating material;
Attach and remove the terminal nut from the terminal board to the conductor introduction side
Forming an opening of the size that can be
A locking groove is formed on the surface and this locking groove has elasticity.
A terminal device comprising a cover plate having the same .