JPH0430702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a plug-type earth leakage breaker.

[Background Art] Conventionally, in this type of earth leakage breaker, the base, cover, and terminal cover constituting the outer shell are assembled using a plurality of screws, or
It was assembled in one touch using uneven fitting. Therefore, if the outer shell is assembled with multiple screws, the assembly becomes complicated, and if the outer shell is constructed only by concave-convex fitting, the base and cover can be easily removed by hand, and the outer shell can be firmly attached. There was a problem that the shell could not be constructed.

[Object of the Invention] The present invention has been provided in view of the above points, and provides a structure of an earth leakage breaker whose purpose is to simplify the assembly of the outer shell such as the base, cover, terminal cover, etc. It is something.

[Disclosure of the Invention] Examples of the present invention will be described below with reference to the drawings.
FIG. 1 shows an exploded perspective view of the earth leakage breaker main body 11. Inside the housing 8 constituting the outer shell, there is an earth leakage detection block 1 for detecting the earth leakage flowing in the main circuit, and from the earth leakage detection block 1. A relay 2 is driven by a signal to open a contact 3 inserted into the main circuit, a terminal block 4 has one end connected to the contact 3 and the other end connected to a load, and a ground terminal 5 on the surface. A plug blade 7 with a protruding tip, etc., which is inserted into and connected to a plug blade insertion opening 9 of a protruding outlet 6 to receive power, is housed. First, the housing 8, which is a molded part, will be explained. The housing 8, which is made of an insulating material, includes a base 12 on which the above-mentioned members are arranged, a cover 13 that covers the earth leakage detection block 1, the relay 2, etc. It is composed of three members: a terminal cover 14 adjacent to the cover 13 and covering the terminal block 4. As shown in FIGS. 1 and 3, the base 12 has a raised stepped portion 12c at one end where the terminal block 4 is disposed, and is formed into a raised stepped portion. A recess 10 for escape of the ground terminal 5 of the outlet 6 is formed on the lower surface of the base 12 on the opposite side from the base 12c. This recess 10
is open at one end and the bottom side, and is used for escape of the ground terminal 5 and the ground wire connected to the ground terminal 5. Laterally projecting flanges 12a are integrally formed on both sides of the base 12 and on the upper part of the other end. Also, base 12
Elongated protrusions 16 are integrally formed at key points on the upper surface of the outer peripheral portion of the holder to protrude upward. The seal 17 is positioned on the base 12 by inserting the protrusion 16 into the hole 18 of the elastic rubber-like seal 17 formed in a substantially U-shape. Furthermore, locking holes 19 are provided on both sides of the base 12.
are opened upward and downward, and this locking hole 1
On the outer surface of the base 12 below the
A locking step portion 20 is formed as shown in FIG.

The cover 13 covering the upper surface of the other end of the base 12 is formed into a box shape with an open lower surface, as shown in FIGS. 1 and 4. An opening 21 is formed at one end of the cover 13, and a flange 12 of the base 12 is formed at both sides of the lower part of the cover 13 and at the other end.
A flange 13a corresponding to a is integrally formed. In addition, a base 1 is provided on both sides of the bottom surface of the cover 13.
A locking piece 22 is formed to be inserted into the locking hole 19 of No. 2, and an engaging hole 23 that engages with the locking step portion 20 is bored in the locking piece 22. An engagement groove 24 that engages with the terminal cover 14 is formed in a portion of the cover 13 located above and to the side of the opening 21 . The upper surface of the cover 13 is formed with a concave surface 28 on which a nameplate 27 is placed, and a test button 2 which will be described later.
5 and a reset button 26 are arranged therein, respectively. Elevated step 12
As shown in FIG. 2b, one end of the terminal cover 14 that covers the terminal cover 14 is integrally formed with an engaging protrusion 30 that fits into the engaging groove 24 of the cover 13, and the other end is An opening 14b corresponding to the raised step 12b of the base 12 is formed by cutting out the opening 14b. Also, bases 12 are provided on both sides of the terminal cover 14.
A flange 14a corresponding to the flange 12a is integrally formed. Then, the cover 13 is placed on the base 12, and the locking piece 22 of the cover 13 is inserted into the locking hole 19 of the base 12 through the through hole 17a of the gasket 17, and engaged with the locking stepped portion 20. Hole 23
are fitted and engaged with one touch, and are held and fixed on the base 12 of the cover 13. Furthermore, Fig. 2b
As shown in FIG.
Insert the assembly screw 31 into the base 12 from below the base 12.
The screw hole 3 of the terminal cover 14 is inserted through the insertion hole 32 of the
3, the base 12, cover 13, and terminal cover 14 can be assembled with one assembly screw 31.

An insertion hole 35 is formed inside the U-shaped wall 34 of the base 12 to insert the plug blade 7 bent into an L shape, and the plug blade 7 projects to the lower surface of the housing 8 through the insertion hole 35. do. A surge absorber 36 is connected between the outer ends of the fixed pieces 60a, 60b of the pair of plug blades 7a, 7b, and a pair of lead wires 37a, 37b are also connected to the outer ends of the plug blades 7a, 7b. It has been done. The plug blades 7a, 7b are inserted into the insertion holes 35, and the fixing pieces 60a, 60b are attached to the base 12.
By inserting the screws 38 from above through the holes 61a, 61b of the fixing pieces 60a, 60b and screwing them into the screw holes 39 of the protrusion 40, respectively,
a pair of plug blades 7a receiving power from the outlet 6;
7b will be fixed to the base 12. The terminal block 4 that supplies power to the load is composed of a pair of conductive terminal plates 41 and 42, one of which is a flat terminal plate 41 that is screwed and fixed onto the elevated stepped portion 12c of the base 12 with screws 43. and also the other L
Similarly, the letter-shaped terminal plate 42 is screwed and fixed onto the elevated stepped portion 12c with screws 44. Both terminal plates 41, 4
2, contact plates 41a, 42a are formed extending downward, and fixed contacts 41 are formed on the contact plates 41a, 42a.
b, 42b are fixed respectively. Elevated step 12
The relay 2 is fixed to the storage recess 45 on the base 12 on the side of c by a screw 46 from below the base 12, as shown in FIG. 2b. The armature 2b of the relay 2 is biased by a spring 2a in the direction of separating from the iron core 2c, and a pair of conductive movable contact plates 47 and 48 that interlock with the armature 2b are attached to the armature 2b. Furthermore, this movable contact plate 4
The contact plate 4 of the terminal plates 41 and 42 is located at the bottom of 7 and 48.
Movable contacts 47a and 48a facing fixed contacts 41b and 42b of 1a and 42a are fixed, respectively. These movable contacts 47a, 48a and fixed contacts 41b, 42b constitute a contact 3 that opens and closes the main circuit. When the relay 2 is not driven, the movable contact 47 is moved by the biasing force of the spring 2a.
a, 48a are in contact with fixed contacts 41b, 42b, and the main circuit is in a closed state.

Next, the earth leakage detection block 1 will be explained.
Before that, the circuit of the earth leakage breaker main body 11 mainly including the earth leakage detection block 1 will be explained. As shown in FIG. 8, the plug blade 7 is an input end connected to a power source.
The main circuit from the main circuit passes through a zero-phase current transformer (ZCT) 49 and is connected to terminal plates 41 and 42 as output ends via the contacts 3 of the relay 2. The coil 2d of the relay 2 is connected to the input side via a diode bridge DB, and power is supplied to the earth leakage detection block 1 from the output side of this diode bridge DB. The earth leakage detection block 1 includes an amplifier circuit 50 that amplifies the voltage induced in the secondary coil wound on the ZCT 49 at the time of earth leakage and outputs it as a signal;
When the trigger transistor 51 is driven by the output signal of the amplifier circuit 50 and the transistor 51 is driven, a gate current flows and turns on the coil 2d.
The relay 2 is made up of a thyristor 52 and the like that turns on the relay 2 by passing a drive current through it. In addition, a light emitting diode 53 that displays an earth leakage indication when the thyristor 52 is turned on, and a neon lamp 54 that is connected in parallel to the main circuit and that displays electricity when power is being supplied to the load are installed in the earth leakage detection block 1. It is set up. Further, a reset switch 26a driven by the reset button 26 is connected in parallel with the input end of the diode bridge DB to restore the thyristor 52. Further, a test switch 25a driven by the test button 25 is connected to short-circuit the main circuit, and when the test switch 25a is closed, a current leakage is forcibly caused to perform a test.

The circuit shown in FIG. 8 operates as follows. That is, in a normal state where there is no current leakage, the relay 2 is not driven, the contacts 3 are closed, and the power is supplied to the load via the plug blade 7, the main circuit, the contacts 3, and the terminal boards 41 and 42. supplied to At this time, power is supplied to the neon lamp 54, so
A neon lamp 54 is used to indicate energization. Here, when a leakage occurs, the current flowing through the main circuit becomes unbalanced, a voltage is induced in the secondary coil wound around the ZCT 49, and the voltage is transferred to the amplifier circuit 50.
is amplified by The signal amplified by the amplifier circuit 50 drives the transistor 51 to turn on the thyristor 52. When the thyristor 52 is turned on, current flows through the coil 2d of the relay 2, the diode bridge DB, and the thyristor 52, so the relay 2 is driven and the armature 2b is connected to the iron core 2c.
The movable contact plates 47 and 48 are attracted to the terminal plate 4.
Fixed contacts 41 of contact plates 41a and 42a of 1 and 42
The movable contacts 47a and 48a are driven in the direction of opening and opening from the movable contacts 47a and 48a. Therefore, the contact 3 inserted into the main circuit is opened, and the power supply to the load is cut off. At this time, the neon lamp 54 is turned off, and the light emitting diode 53 is turned on to indicate a current leakage. In addition, the earth leakage detection block 1
When resetting, the reset button 26 is pressed, the reset switch 26a is closed, the power is temporarily cut off, and the thyristor 52 is reset to return to the initial state. Incidentally, when the test button 25 is operated, the operation is similar to that described above.

Next, the structure of the earth leakage detection block 1 will be explained. As shown in FIGS. 1, 2, and 5, the earth leakage detection block 1 has a frame 55 whose outer shell is L-shaped.
An L-shaped piece 55a is formed on the lower surface of the frame 55.
and the fixed piece 55b are integrally formed. The frame 55 is placed on the U-shaped wall 34 of the base 12, and the L-shaped piece 55a is located inside the inner corner 57 of the base 12 and the wall 58, and the frame 55, that is, the leakage detection Block 1 will be positioned on base 12. Inside the frame 55 is a printed circuit board 5 on which electronic circuit components of the earth leakage detection block 1 are mounted.
6, ZCT49, etc. are installed. A light emitting diode 53 is arranged on the upper surface of the printed circuit board 56, and a neon lamp 54 is attached to a mounting portion 59 formed at one end edge of the frame 55.
In addition, the through hole 4 of the ZCT 49 on the other end side of the frame 55
On the printed circuit board 56 located on both sides of the test switch 9a and above it, there are a conductive contact spring 25b and a terminal bar 25c that constitute the test switch 25a, and a conductive contact spring 26b that constitutes the reset switch 26a. Terminal rods 26c are respectively provided. The bases of the contact springs 25b and 26b are positioned by the protrusion 55d, and the lower ends are fixed to the printed circuit board 56. The contact springs 25b, 26b are biased upward and are normally separated from the terminal bars 25c, 26c, and the test switch 25a and reset switch 26
A is open. ZCT49 lead wire 49b
is wired along the lower surface of the frame 55, and is further connected to the printed circuit board 56 from the side surface of the frame 55 via the slit 55c of the fixed piece 55b.

By the way, on the base 12 there is a relay 2, a plug blade 7,
When the earth leakage detection block 1 is installed, as shown in FIGS. 1 and 2, a pair of plug blades 7a, 7b
An earth leakage detection block 1 is located above the relay 2.
The ZCT 49 of the earth leakage detection block 1 is located behind the ZCT 49. The lead wire 37a connected to one of the blades 7a is wired toward the other blade 7b, and is paired with the lead wire 37b connected to the blade 7b as shown in FIG. 2e. , the pair of lead wires 37a and 37b pass through the through hole 49a of the ZCT 49, as shown in FIGS. 2b and d,
The conductors at the tips of the lead wires 37a and 37b that constitute the main circuit are held down and fixed by a holding claw 62 that is integrally provided on the frame 55, and the movable contact plate 47,
48 connection terminals 47b and 48b. With this configuration, no extra force is applied to the relay 2 by the lead wires 37a, 37b, which are the main circuit wires, and the lead wires 37a, 37b can be stored smoothly. Also, one lead wire 63a from the coil 2d of the relay 2 is connected to the plug blade 7a as shown in FIG. 2e, and the other lead wire 63b is connected to the contact spring 26b as shown in FIG. 2d. . Further, a lead wire 64 from the printed circuit board 56 of the earth leakage detection block 1 is connected to the terminal plate 42.

Next, the structure and mounting structure of operation buttons such as the test button 25 and the reset button 26 will be explained based on FIGS. 2 and 6. The explanation is about the reset button 26.
The same applies to the test button 25. The reset button 26 is a columnar body having elasticity and an elliptical cross section, and is made of sunplain material to provide a waterproof effect. The upper part of the reset button 26 is an operating part 65 that protrudes from the upper surface of the cover 13, and the lower part has a smaller diameter than the operating part 65, and a collar 67 for preventing slipping out is integrally formed around the entire circumference of the lower edge. Further, a cylindrical body 66 is integrally formed approximately at the center of the reset button 26 with a thin wall portion 68 interposed therebetween. The upper and lower surfaces of this cylindrical body 66 are formed into planar shapes. On the other hand, on the top surface of the cover 13, there are a reset button 26 and a test button 2.
Two button storage portions 29 are formed in which buttons 5 are disposed, and the button storage portions 29 have the following structure. That is, as shown in FIG. 2b and FIG. 4, the button storage portion 29 is similarly shaped in an ellipse in accordance with the formation of the reset button 26 having an elliptical cross section. An insertion hole 70 through which the lower part of the reset button 26 is inserted is bored in the center of the bottom plate 69, which is formed one step lower.
A rib 72 is integrally formed on the upper surface of the bottom plate 69 around 0. A groove formed between the rib 72 and the outer wall 73 is a fitting groove 71.
1 into which the cylindrical body 66 of the reset button 26 is fitted. Note that the dimension between the top surface of the cover 13 and the bottom plate 69 and the length dimension of the cylindrical body 66 of the reset button 26 are approximately the same dimension. Therefore, although the reset button 26 is attached to the button storage section 29,
Insert the lower part of the reset button 26 into the insertion hole 70 of the bottom plate 69, and lock the collar 67 of the reset button 26 to the lower surface of the bottom plate 69 around the insertion hole 70 to prevent the reset button 26 from coming off. Reset button 26
The cylindrical body 66 fits into the fitting groove 71, and the reset button 2
6 is positioned in the button storage section 29. Furthermore, the operation part 65 of the reset button 26 is passed through the through hole 74 drilled in the nameplate 27, and the
is attached to the upper surface of the concave surface 28 of the cover 13. At this time, the size of the through hole 74 of the name plate 27 is large enough for the operation part 65 of the reset button 26 to pass through, so as shown in FIG. The upper surface of the cylindrical body 66 of the reset button 26 is pressed or elastically contacted with the lower surface of the reset button 2.
It is held by the name plate 27 of No. 6, and is made waterproof by the contact between the lower surface of the name plate 27 and the upper surface of the cylindrical body 66. Furthermore, contact between the name plate 27 and the cylindrical body 66 of the reset button 26 and the contact between the collar 67 and the bottom plate 69
The reset button 26 can be prevented from coming off by being locked with the button. In this way, one reset button 26 can have both a waterproof effect and a retaining effect.

Then, the test button 25 attached to the button storage section 29
A test switch 25a and a reset switch 26a of the earth leakage detection block 1 are located below the reset button 26. That is, a contact spring 25b is located below the test button 25, and a contact spring 26b is located below the reset button 26. Then, test button 25 and reset button 26
When pressed, contact springs 25b and 26b are energized, and test switch 25a and reset switch 26a are closed. When the test button 25 and the reset button 26 are released, the elastic return force of the test button 25 and the reset button 26 themselves and the contact spring 25
The test button 25 and the reset button 26 are restored by the restoring forces of b and 26b. The cover 13 is provided with opening windows 75 and 76 through which the light from the light emitting diode 53 and neon lamp 54 of the earth leakage detection block 1 is transmitted.
Similarly, display windows 78 and 79 are provided. In addition, the bushing 79 for inserting and holding the lead wire for supplying power to the load is connected to the base 12 and the terminal cover 1.
4 and the semicircular notch 80 when assembled.
It is fitted and held by a and 80b.

However, the earth leakage breaker body 11 is connected to the outlet 6.
When installing, proceed as follows. That is, as shown in FIG. 7, the outlet 6 provided on the wall has two sets of plug blade insertion holes 9 formed therein, and below the plug blade insertion holes 9, a ground terminal 5 protrudes toward the front side. It is formed. In normal installation, where the earth leakage breaker main body 11 is installed with the earth terminal 5 facing downward, a recess 10 for escape of the earth terminal 5 is provided at the bottom of the earth leakage breaker main body 11, which has the plug blade 7 on the upper part. Because we have established
Even if the plug blade 7 is inserted and connected to the plug blade insertion port 9, the earth terminal 5 of the outlet 6 is connected to the earth leakage breaker main body 1.
It will be located in the recess 10 of 1. Therefore,
Even though the ground terminal 5 is located below the plug blade insertion slot 9 and protrudes from the front, the ground terminal 5 escapes through the recess 10 of the earth leakage breaker body 11, so the ground terminal 5 Connect the earth leakage breaker main body 11 to the outlet 6 without getting in the way.
It can be set up in a nice manner.

9 to 11 show the earth leakage breaker body 1 when the earth leakage breaker body 11 is attached to the outlet 6.
1 shows the structure and attachment method of a fixing frame 81 that holds and fixes the earth leakage breaker main body 11 so that the earth leakage breaker main body 11 does not easily come off from the outlet 6. That is, holding pieces 82 are formed to protrude from the upper portions of both sides of the fixed frame 81 toward the front side, and at the inner tips of the holding pieces 82,
A locking protrusion 83 that locks the flange portion 15 formed by the flange 12a of the base 12, the flange 13a of the cover 13, the flange 14a of the terminal cover 14, etc. is integrally provided. Further, a screw insertion hole 84 is formed in the center of the fixed frame 81, and a pedestal 85 is integrally formed on the lower back side, and this pedestal 85 also has a screw hole 86 for screw insertion. 1st
As shown in Figure 0, when the plate screws 90 that fix the plate 87 attached to the front of the outlet 6 are exposed, the upper part of the plate 87 fixes the plate 87 with the original plate screw 90, and the plate 87 A screw 88 such as a flat head machine screw is screwed into the outlet 6 through the screw insertion hole 84 of the fixed frame 81 to attach the fixed frame 81 to the plate 87 of the outlet 6. At this time, the protruding dimension of the pedestal 85 of the fixed frame 81 is almost the same as the thickness of the plate 87, and the fixed frame 81 is
When attached to the plate 87, the back surface of the pedestal 85 is in close contact with the surface of the construction material 91, and the fixed frame 81 can be attached to the plate 87 without deforming or wobbling. Then, insert the plug blade 7 of the earth leakage breaker main body 11 into the plug blade insertion opening 9 of the outlet 6.
Insert and attach. At this time, since the holding piece 82 of the fixed frame 81 has elasticity, the holding piece 82 opens outward and the flange portion 15 of the earth leakage breaker main body 11
, and then elastically returns so that the locking protrusion 83 of the holding piece 82 engages with the flange 1 of the earth leakage breaker main body 11.
5, the earth leakage breaker main body 11 is fixed to the fixed frame 81.
It will be held and fixed. FIG. 11 shows a case where the plate screws are not exposed on the plate 87. In this case, the screw holes 86 drilled in the pedestal 85 are inserted into the screw holes 84 of the fixing frame 81 instead of using the screw insertion holes 84 of the fixing frame 81. A screw 89 such as a wood screw is inserted, and this screw 89 is directly screwed into the construction material 91 below the plate 87, thereby fixing the fixed frame 81 to the construction material 91. Therefore, this fixed frame 81
By using the fixed frame 81 for all plates
Furthermore, even in the worst case where it is difficult to fix to construction materials, the fixing frame 81 can be fixed by replacing it with a plate with exposed screws.

12 to 14 show other embodiments of the fixed frame 81. FIG. That is, the elastic holding pieces 82 on both sides of the U-shaped fixed frame 81
A locking protrusion 83 that locks the flange portion 15 of the earth leakage breaker main body 11 to hold and fix the earth leakage breaker main body 11 is integrally formed at the inner upper end portion of the earth leakage breaker main body 11 .
Further, a U-shaped fixing piece 92 is provided on the lower surface of the fixing frame 81.
are formed, and insertion pieces 92a are formed on both sides of this fixing piece 92 so as to project laterally.
The fixing frame 81 is fixed by fitting the insertion piece 92a of the fixing piece 92 between the outlet 6 and the plate 87, as shown in FIG. That is, before attaching the plate 87 to the mounting frame on the outlet 6 side, insert the insertion piece 92a of the fixed piece 92 of the fixed frame 81 through the opening window 87a of the plate 87, and insert the insertion piece 92a between the front of the outlet 6 and the back of the plate 87. The plate 87 is attached to the mounting frame by inserting the insertion piece 92a into the gap 93 formed in the mounting frame. At this time, the fixing piece 92 is attached to the outlet 6
The insertion piece 92a is fixed between the outlet 6 and the plate 87. Then, the plug blade 7 of the earth leakage breaker main body 11 is inserted into the plug blade insertion opening 9 of the outlet 6 and attached.
At this time, since the holding piece 82 of the fixed frame 81 has elasticity, the holding piece 82 opens outward and climbs over the flange portion 15 of the earth leakage breaker main body 11, and then returns elastically to lock the holding piece 82. The protrusion 83 locks the flange portion 15 of the earth leakage breaker main body 11, and the earth leakage breaker main body 11 is held and fixed to the fixed frame 81.

15 to 17 show still another embodiment of the fixed frame 81, in which U-shaped locking pieces 94 are inserted from the lower ends of both sides of the fixed frame 81 so that their recesses 94a face each other. It is formed to protrude in the lateral direction. That is, the thickness of the recess 94a of the locking piece 94 is formed to be approximately the same as the thickness of the plate 87, and both sides of the plate 87 are connected to the locking piece 9.
By inserting it into the recess 94a of No. 4, the fixed frame 81
is held on plate 87. And fixed frame 8
1 to an appropriate position on the plate 87, and then fixing the plate 87 to the mounting frame, the locking piece 94 is held between the front surface of the construction material 91 and the edge of the plate 87, and is fixed. The frame 81 is held and fixed to the plate 87. Note that the function of holding and fixing the earth leakage breaker body 11 by the fixing frame 81 is the same as in the previous embodiment, so a description thereof will be omitted.

Figure 18 shows the set switch 25 in Figure 1.
a and the terminal bar 25c of the reset switch 26a,
26c is integrated into a terminal plate 95, and this terminal plate 95 is used as a common terminal. That is, the set switch 25a and the reset switch 2
6a are connected to one side of the main circuit, respectively, so the terminal board 95 has one end common to the set switch 25a and the reset switch 26a.
Therefore, it is connected to one side of the main circuit. Therefore, the two terminal bars 25c, 26c
Compared to the case of the above-described embodiment in which a terminal board 95 was used, only one terminal board 95 can be used, and the configuration of the terminal portion can be simplified.

[Effects of the Invention] As described above, the present invention includes an earth leakage detection block that detects electric leakage flowing in the main circuit, and a relay that is driven by a signal from the earth leakage detection block and opens a contact inserted in the main circuit. and a terminal block having one end connected to the above-mentioned contact and the other end connected to the load, a base disposed on the top surface, a cover attached to the base covering the earth leakage detection block, relay, etc., and a cover that covers the terminal block. A locking hole having a locking step inside is bored in the contact surface of the base with the cover, and a locking convex portion is inserted into the locking hole in the cover. A locking piece having an engagement hole that engages with the terminal cover is formed, and an engagement groove is formed on the side surface of the cover opposite to the terminal cover, and the locking piece is engaged with the engagement groove of the cover when the cover is attached to the base. The terminal cover is formed with an engaging protrusion on the terminal cover, and the terminal cover is screwed with a screw that is screwed from the bottom side of the base. Therefore, first, the cover is attached to the base without screwing by concave-convex engagement. After that, by engaging the engagement protrusion in the engagement groove of the cover and screwing the terminal cover, the cover and terminal cover can be attached to the base with one screw. Assembly is easier than attaching the cover and terminal cover to the base using screws. In addition, since the terminal cover is screwed on, it cannot be removed unless the screws are removed, and the engagement protrusion of the terminal cover is engaged in the engagement groove of the cover, so unless the terminal cover is removed. It cannot be removed. In other words, the cover and terminal cover cannot be removed without removing the screws, and since the cover and terminal cover are attached to the base and screwed on in areas that are not exposed to the surface, when in use, the cover and terminal cover must be removed from the surface side. This has the effect of being safe since there is no fear that the cover or terminal cover will be removed inadvertently.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the earth leakage breaker body according to the embodiment of the present invention, FIG. Figure 2 d is a plan view with the above cover and terminal cover removed; Figure 2 e is a plan view with the same cover, terminal cover and earth leakage detection block removed; Figure 3 a is a plan view of the base as above,
Figure 3b is a cross-sectional view taken along line A-A in Figure 3a above.
Figure c is the bottom view of the same as above, Figure 3 d is the same as Figure 3 a of the above.
BB sectional view of , FIG. 3e is a broken front view of the same as above,
Figure 3f is a sectional view taken along the line C-C in Figure 3a above.
Figure g is a sectional view taken along line DD in Figure 3a above, Figure 4a
~d are a plan view, a sectional view, a bottom view, and a broken front view of the same cover, and Figures 5 a~c are a plan view, a sectional view, and a bottom view of the earth leakage detection block, and Figures 6 a~
d is a plan view, a cutaway front view, a bottom view, and a cross-sectional view of the reset button as above; FIG. 7 is a perspective view of the earth leakage breaker body and an outlet with a ground terminal as above;
Figure 8 is the overall circuit diagram of the same as above, Figures 9 a to c are front, side, and bottom views of the above fixing frame attached to the earth leakage breaker main body, and Figure 10 shows the plate screws of the same as above. A diagram showing the mounting state of the fixed frame when it is exposed, FIG. 11 is a diagram showing the mounting state of the fixed frame when the plate screw same as above is not exposed,
FIG. 12 is a perspective view of another embodiment of the fixed frame same as above;
FIG. 13 is a perspective view of the same as the above, FIG. 14 is a cross-sectional view showing the mounting state of the same as the above, FIG. 15 is a perspective view of still another embodiment of the fixed frame of the same as the above, and FIG. FIG. 17 is a cross-sectional view showing the installed state of the same as above, and FIG. 18 is a perspective view of another embodiment of the earth leakage detection block same as above. 1 is an earth leakage detection block, 2 is a relay, 3 is a contact, 4 is a terminal block, 12 is a base, 13 is a cover, 14 is a terminal cover, 19 is a locking hole, 20 is a locking step, 22 is a locking piece , 23 is an engagement hole, 24 is a locking groove, 30 is an engagement protrusion, and 31 is an assembly screw.

Claims (1)

[Claims] 1. An earth leakage detection block that detects electric leakage flowing in the main circuit, a relay that is driven by a signal from the earth leakage detection block and opens a contact inserted in the main circuit, and one end connected to the above contact and the other end It consists of a base on which the terminal block connected to the load is placed, a cover that is attached to the base to cover the earth leakage detection block, relay, etc., and a terminal cover that is attached to the base to cover the terminal block. A locking hole having a locking step inside is bored in the surface that comes into contact with the cover, and a locking piece is inserted into the cover and has a locking hole that is inserted into the locking hole and engages with the locking protrusion. forming an engagement groove on the side surface of the cover facing the terminal cover, and forming an engagement protrusion on the terminal cover that is engaged with the engagement groove of the cover when the cover is attached to the base; An earth leakage breaker structure in which the terminal cover is screwed onto the base using screws that are screwed in from the bottom side of the base.