JP3183395B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker of a contract type mainly used for a light distribution board, and more particularly to a wiring breaker and a leakage breaker having a function of two poles within a contract width. About the vessel.

[0002]

2. Description of the Related Art FIG. 28 is a perspective view showing the appearance of a conventional circuit breaker of this type, FIG. 29 is a front view showing the inside of a distribution board using this circuit breaker, and FIG. It is an enlarged view of the Q section. In FIG. 28, a circuit breaker 1 for wiring has a one-pole opening / closing part and an overcurrent tripping element housed in a body 2 of an insulator (mold resin) having a width of 25 mm defined by a collective shape. An opening / closing handle 3 protrudes from the front surface, and a power supply terminal 4 and a load terminal 5 are arranged at both ends.

A large number of such circuit breakers 1 are arranged inside a light distribution board 6 as shown in FIG.
The main line 8 from is branched. Generally, a single-phase three-wire circuit is used for the light distribution board 6, and a 100V circuit and a 200V circuit are often mixed. In this case, the voltage line 9a of the wiring 9 (FIG. 30) of the 100V circuit is connected to the circuit breaker 1, and the neutral line 9b is connected to the separately arranged block terminals 10. Also, 20
In the 0V circuit, voltage lines on both sides are connected to each of two wiring circuit breakers 1 arranged in parallel. At this time, the two opening / closing handles 3 are integrally connected by one structural member, and can be simultaneously opened / closed.

[0004] The same type of earth leakage breaker is also basically based on a width dimension of 25 mm per pole determined by the agreement type dimensions, and has two poles.
The mainstream type has a width of 50 mm, but the external dimensions are different from those of the 100 V circuit breaker.

[0005]

In the distribution board 6 using the circuit breaker 1, the wiring breaker 1 is conventionally a single-pole product. 10 requires a space for arranging the block terminals 10 in the distribution board 6, and the wiring circuit breaker 1 and the wiring 9 connected to the block terminals 10 are separated from each other by a voltage line. There is a problem that the length of the connection end portion differs between the neutral wire 9a and the neutral wire 9b, and it takes time to process and connect the wiring. In addition, as for the 200V circuit, as a result of using two circuit breakers 1 in parallel, there is a problem that the required width dimension at that portion is 50 mm, which is twice as large as that of the circuit breaker 1. Furthermore, the outer dimensions of the circuit breaker and the earth leakage breaker were different. Therefore, an object of the present invention is to provide a single-phase 3
Both the 100V circuit and the 200V circuit of the wire circuit can be wired with a single wiring breaker with a contracted size, and the external dimensions of the wiring breaker and earth leakage breaker are shared to reduce the distribution board And reducing the number of man-hours for wiring processing and connection work.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a circuit breaker for a 100V circuit having a two-pole switchgear and a one-pole breaker within a 25 mm-wide contracted size. It has an overcurrent trip element and a 2-pole switch and an overcurrent trip element as a circuit breaker for wiring 200V circuits. In that case, it has a 2-pole switch within the same width. A device shall be devised to secure the necessary insulation distance and current carrying capacity while holding the unit and the overcurrent trip element. Furthermore, as for the earth leakage breaker, an earth leakage trip element is provided in the above-mentioned wiring breaker so that the external dimensions of the wiring breaker and the earth leakage breaker are made common.

A circuit breaker according to a first aspect of the present invention relates to a circuit breaker for a 100 V circuit. The circuit breaker has a substantially I-shaped cross-section provided with a partition wall at the center, and a circuit breaker for the case. An insulating body having left and right two-pole covers respectively combined on both sides, and an opening / closing handle having a pair of left and right legs, rotatably connected to the case across the bulkhead with the legs. A flat plate-like two-pole movable contact having a plate surface disposed on both sides thereof along the case partition wall, one end rotatably connected to the leg of the opening / closing handle, and a movable contact attached to the other end. A fixed iron core having a U-shaped cross-sectional magnetic path composed of a child, a strip-shaped bimetal, a flat base and legs bent on both sides thereof, and surrounding the bimetal in its width direction with both legs. Rotate at one end parallel to bimetal The armature comprises a flat armature whose other end is opposed to the fixed iron core and a return spring for urging the armature to the side opposite to the fixed iron core, and the plate surface of the armature is the case partition wall. An overcurrent trip element disposed on one side of the partition wall along the partition wall, and the plate surface is disposed between the partition wall and the overcurrent trip element along the case partition wall. A flat latch, which is rotatably supported by the case and protrudes laterally at the other end thereof, and is latched to the step on the side surface of the armature with the claw; A left and right two-pole open / close spring comprising a tension spring spanned between the movable contact and the latch, and provided on the overcurrent trip element, respectively. Said baime Screw is loosely inserted into the armature or bimetal, and an adjustment screw whose head faces the bimetal or armature through a gap, and a fixed contact that faces the movable contact are attached and the terminals are integrally formed. A fixed contactor having right and left two poles respectively arranged on both sides of one end of the case bulkhead; terminals of right and left two poles respectively arranged on both sides of the other end of the case bulkhead; A lead wire connecting between one end of the bimetal and the movable contact of the overcurrent trip element and between the other end of the bimetal and the terminal,
A lead wire for connecting the movable contact and the terminal on the other side of the case partition wall.

In this circuit breaker, left and right pole parts are arranged on both sides of the center partition wall of the case having a substantially I-shaped cross section to ensure insulation between both poles. The bimetal and armature of the movable contact, the latch, and the overcurrent trip element are formed in a flat plate shape, and are stacked along the case partition wall to reduce the width dimension. The left and right two-pole open / close springs are respectively arranged between the case partition and the left and right two-pole movable contacts, and are simultaneously placed in the space required between the movable contact and the case partition for mounting the movable contact. I have. The left and right movable contacts are simultaneously opened and closed by a common opening and closing handle. The tripping characteristics of the overcurrent tripping element can be adjusted by turning the adjusting screw to change the gap between its head and the bimetal or armature.

Next, a circuit breaker according to a second aspect of the present invention relates to a circuit breaker for a 200 V circuit. The circuit breaker has a substantially I-shaped cross-section having a partition wall at the center and a case having the same. An insulator main body comprising a left and right two-pole cover respectively combined on both sides of the main body, and an opening / closing handle having a pair of left and right legs, rotatably connected to the case across the partition wall with the legs. A flat plate-like two-pole movable contact having a plate surface disposed on both sides thereof along the case partition wall, one end rotatably connected to the leg of the opening / closing handle, and a movable contact attached to the other end. A fixed iron core having a U-shaped cross-sectional magnetic path composed of a child, a strip-shaped bimetal, a flat base and legs bent on both sides thereof, and surrounding the bimetal in its width direction with both legs. Rotate at one end parallel to bimetal The armature comprises a flat armature whose other end is opposed to the fixed iron core and a return spring for urging the armature to the side opposite to the fixed iron core, and the plate surface of the armature is the case partition wall. A first overcurrent trip element disposed on one side of the partition wall along the side of the partition wall, a strip-shaped bimetal, a U-shaped cross-section comprising a flat base and legs bent on both sides thereof. A fixed armature having a path and surrounding the bimetal in its width direction at both leg portions, a flat armature supported at one end in a rotatable manner in parallel with the bimetal, and an armature at the other end facing the fixed iron core; And a return spring for urging the armature toward the fixed iron core,
A second overcurrent trip element disposed on the other side of the partition so that a plate surface of the base of the fixed iron core is along the case partition; and the first and second through elements penetrating the case partition. A plate interposed between the armature of the overcurrent trip element and transmitting a suction operation of the armature of the second overcurrent trip element to the armature of the first overcurrent trip element; A surface is disposed between the partition and the overcurrent trip element so as to be along the case partition,
One end is rotatably supported by the case, and the other end has a claw that protrudes laterally.The claw is latched to a step on the side surface of the armature with the claw, Left and right two-pole opening / closing springs, each of which is disposed between the left and right two-pole movable contacts and a tension spring spanned between the movable contact and the latch; Provided on each overcurrent trip element,
A first screw which is loosely inserted into the bimetal or the armature and screwed into the armature or the bimetal, and a head of which is opposed to the bimetal or the armature via a gap;
And a second adjusting screw, a fixed contact opposed to the movable contact is attached, and a terminal is integrally formed. Right and left two-pole fixed contacts arranged on one end sides of the case partition, respectively; Left and right two-pole terminals respectively disposed on both sides of the other end, and between one end of the bimetal of the first overcurrent trip element and the movable contact on one side of the case partition wall and the other of the bimetal. A lead wire for connecting between an end and the terminal; and a lead wire between one end of the bimetal of the second overcurrent trip element and the movable contact on the other side of the case partition wall and the other of the bimetal. And a lead wire for connecting between the end and the terminal.

The circuit breaker of the present invention is obtained by adding a second overcurrent trip element to the circuit breaker of the first aspect, and has two latches for tripping the circuit breaker when an overcurrent is detected. One common overcurrent trip element is provided, and this latch is locked to the armature of the first overcurrent trip element. In order to transmit the operation of the second overcurrent trip element to the first overcurrent trip element, a transmission member is interposed between the two armatures. As a result, the tripping mechanism (latch) can also be used for the left and right poles, and the required width direction space can be reduced. The bending of the bimetal of the second overcurrent trip element is transmitted to the armature via the second adjusting screw and further transmitted to the armature of the first overcurrent trip element via the transmission member. Further, the operation of attracting the armature of the second overcurrent trip element is transmitted to the armature of the first overcurrent trip element via the transmission member regardless of the bimetal.

A circuit breaker according to a third aspect of the present invention relates to an earth leakage breaker configured by adding an earth leakage detection function to the wiring breaker according to the first or second aspect. Left and right two-pole conductors for connecting between the overcurrent trip element and the movable contact and the terminal, or right and left two-pole conductors for connecting between the first and second overcurrent trip elements and the terminal, respectively Current transformer having a primary conductor as a primary conductor, a leakage detection circuit for amplifying the secondary output of the zero-phase current transformer, and a plunger driven by the output of the leakage detection circuit to attract the plunger against the return spring. And a trip lever for moving the armature of the overcurrent tripping element or the armature of the first overcurrent tripping element toward the fixed core side in conjunction with the attraction operation of the plunger. Removal element It shall be provided.

The earth leakage breaker is slidably provided along a case partition wall, and a display portion of the head is urged by a spring in a direction projecting from the case, and is always locked by a trip lever. The display part is moved against the spring in response to the reset operation of the latch after the earth leakage trip, and the earth leakage display piece is held inside the case, and the display part is moved again with the trip lever. It is preferable to provide a leakage display mechanism including a display latch to be engaged.

In the above-mentioned circuit breaker in which the opening / closing spring is disposed between the case partition and the movable contact, the latch receiving the tension of the opening / closing spring between the movable contact and the latch tends to fall toward the case partition. Therefore, a protrusion extending toward the case partition is integrally formed on both legs of the fixed core of the overcurrent tripping element or the first overcurrent tripping element, and the latch is pushed toward the case partition by the protrusion. This makes it possible to reliably hold down the above-mentioned fall of the latch.

Similarly, the movable contact that receives the tension of the opening / closing spring between the latch and the latch falls down toward the case partition, and the end on the movable contact side may contact the case partition. Therefore,
Between the movable contact side end portions of the movable contacts on both sides of the case partition, a connection piece that penetrates the opening provided in the case partition and has both ends fitted to the ends of the movable contact, respectively, is inserted. Is good. The insertion of the connecting piece prevents the left and right movable contacts from approaching each other, so that the movable contacts do not contact the case partition.

In the above movable contact, an end of the connecting piece is provided with a concave portion for accommodating a root portion (a boundary portion between a joined portion and a non-joined portion) of a lead wire joined to the movable contact. Good. A lead wire joined to a movable contact by brazing or welding tends to be frayed or disconnected due to stress concentrated at the root portion due to repeated bending due to opening and closing operations of the movable contact. Therefore, by accommodating this root portion in the concave portion of the connecting piece, the bending of the lead wire is kept away from the root portion, and the phenomenon of fraying and disconnection at this portion is reduced.

On the other hand, the bimetal of the overcurrent trip element is
It is heated and bent by the overcurrent flowing through itself, and this bending operation is transmitted to the armature that has locked the latch via the adjustment screw.At this time, if the head of the adjustment screw directly contacts the bimetal or armature, An electrical path is created that bypasses the bimetal, and some of the heat needed to bend the bimetal is lost. Therefore, it is preferable to insert an insulating material between the head of the adjusting screw and the bimetal or armature facing the adjusting screw. Thus, it is possible to prevent the bypass electric circuit from being generated via the adjusting screw.

In the above-described circuit breaker, if the head of the adjusting screw is located on the cover side and the cover is provided with an adjusting hole facing the head, the adjusting screw is turned through the adjusting hole with the cover attached. This eliminates the need to remove the cover if the trip characteristics need to be readjusted after assembly is completed.

In the circuit breaker described above, it is preferable that a latch retainer is provided on the side surface of the latch near the claw with a slight gap therebetween, and the latch retainer is fitted into the case partition wall and fixed by the cover. Good. The trip characteristic of the overcurrent trip element is directly affected by the amount of engagement of the claws of the latch locked on the armature. Therefore, when the latch claw portion oscillates, the tripping characteristics become unstable, and there is a danger of mistrip due to vibration at the time of opening and closing. Therefore, if a latch retainer is provided which presses the vicinity of the latch claw with a gap as small as possible, the above-mentioned run-out can be prevented, the tripping characteristics can be stabilized, and mistrip can be prevented.

Meanwhile, the conventional circuit breaker of the contract type has no built-in alarm switch (a switch for outputting an alarm signal at the time of a trip operation) due to dimensional restrictions. Therefore, the present invention enables the incorporation of the alarm switch by disposing the microswitch along the central partition of the case having the I-shaped cross section. That is, in the circuit breaker according to the eleventh aspect, an alarm switch formed of a micro switch is provided along the case partition so as to interlock with the latch, and the alarm switch has a mounting hole fitted to a protrusion formed in the case partition. Then, it is to be sandwiched and fixed between the case partition and the cover.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same reference numerals are used for the portions corresponding to the conventional example. First, FIG. 1 is a perspective view showing an external appearance of a circuit breaker for wiring, FIG. 2 is a front view showing the inside of a distribution board using the circuit breaker for wiring, and FIG. 3 is an enlarged view of a portion Q in FIG. In FIG. 1, a circuit breaker 1 for wiring has a two-pole opening / closing part and a one-pole or two-pole overcurrent tripping element housed in a main body 2 having a width of 25 mm defined by a contracted size. The opening / closing handle 3 protrudes from both ends, and the power supply side terminals 4 and 11 and the load side terminals 5 and 12 are arranged at both ends. A large number of the circuit breakers 1 are arranged inside a light distribution board 6 as shown in FIGS. 2 and 3, and branch off a main line 8 from a main circuit breaker 7. In that case, 100V
The circuit uses two poles (opening / closing part) and one element (overcurrent tripping element), and does not require a conventional neutral pole block terminal. In addition, a two-pole, two-element circuit is used singly for the 200 V circuit, and it is not necessary to use two elements in parallel.

4 to 13 show a circuit breaker for wiring configured as a two-pole, one-element product. FIG. 4 is a side view of the left pole side without a cover, and FIG. 5 is a side view of the right pole side. FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4, FIG. 8 is an exploded perspective view of a movable contact part, and FIG. FIG. 10 is a schematic perspective view of the detaching device, FIG. 10 is a side view of a main part on the left pole side shown in FIG. 1 excluding the overcurrent tripping device, FIG. 11 is an exploded perspective view of the main part of FIG. 10, and FIG.
FIG. 13 is a cross-sectional view taken along line XII-XII of FIG. In these figures, the wiring breaker is shown in FIG.
As shown in the figure, the opening / closing portion and the overcurrent trip element are housed in the insulator main body 2 made of the molded resin. The main body 2 is composed of the case 13 and the left and right 2 fitted on both sides thereof.
After being assembled to the case 13 and being held down by the covers 14 and 15, the case 13 and the covers 14 and 15 are fixed by four screws (not shown) penetrating left and right. Will be concluded.

4 and 5 show the ON state. On the left-hand side shown in FIG. 4, current flows from the power supply terminal 4 to the fixed contact 4a integral therewith, the fixed contact 16 joined thereto, and the movable contact. 17, a movable contact 18 joined thereto, a flexible conductor 19 joined to one end thereof, a bimetal 21 of an overcurrent trip element 20 joined to the other end, a flexible conductor 22 joined to one end thereof Flows to the load-side terminal 5 to which the other end is joined. On the other hand, there is no overcurrent tripping element on the right pole side in FIG. 5, and current flows from the power supply side terminal 11 to the fixed contact 11a, the fixed contact 23, the movable contact 24, the movable contact 2
5, flows to the load terminal 12 via the flexible conductor 26.

As shown in FIG. 6, the case 13 has a substantially I-shaped cross section having a partition wall 13a at the center, and the terminals 4, 5, 11, and 12 bent into an L shape are formed on both side surfaces thereof. And is fitted and attached to a groove of the same shape formed at the bottom. On the left pole side of the case 13, a flat latch 27 made of a resin molded product is arranged so that its plate surface is along the partition 13a, and is rotatably supported by the case 13 via a pin 28 at the left end in FIG. ing. The right end of the latch 27 in FIG. 4 is integrally formed with a claw 27a projecting sideways.
a engages with the armature of the overcurrent trip element 20 as described below.

The left and right two-pole movable contacts 18 and 25 are formed from flat conductors and have the same shape with different right and left sides. As shown in FIG. 8, a portion 18a bent inside the lower end portion (in the case 13 side) of FIG. , 25a are joined to the movable contacts 17 and 24. The movable contacts 18 and 25 have a plate surface of the partition 13.
8, the movable contact 18 is arranged on both sides of the partition 13a so as to be located outside the latch 27, and is rotatable with respect to the opening / closing handle 3 by an arc-shaped portion formed at the upper end in FIG. It is connected to. Open / close handle 3 for resin molding
6, has a pair of left and right legs 3b on both sides of the base of the handle 3a protruding outside the main body 2, as is apparent from FIG. The opening / closing handle 3 straddles the partition 13 a by the leg 3 b and is rotatably connected to the case 13 via a pin 29. Note that instead of the pins 29, the covers 14, 15
A protruding shaft may be integrally formed inside (FIG. 7), and the protruding shaft may be fitted into the opening / closing handle 3 from both sides to support the opening / closing handle 3, but in this case, the covers 14 and 1 are provided.
There is a problem that the opening / closing handle 3 cannot be supported until the user attaches the handle 5.

The movable contact 1 is provided at the tip of the leg 3b.
Concave portions corresponding to the arc-shaped portions of 8, 25 are formed,
Each of the movable contacts 18 and 25 has an arc-shaped portion slidably fitted into the concave portion, and a left and right two-pole opening / closing spring 3 formed of a tension spring respectively extended between the movable contact 18 and the latch 27.
0, and is rotatably connected to the opening / closing handle 3 as described above. Here, the movable contact 1
The spring hook pieces 18b and 25b are formed to be bent on the reference numerals 8 and 25, and the spring hook projections 27b are provided on the latch 27 (FIG. 6).
Are formed so as to protrude on both left and right sides.
Are stretched and both ends are respectively hung on these. In the portion where the spring hooking projection 27b on the right pole side (left side in FIG. 6) penetrates the partition wall 13a, an arc-shaped long hole 3 is formed.
One is open.

In FIG. 6, the spring hook pieces 18b, 25b
Movable contacts 18, 2 with an opening / closing spring 30
Numeral 5 has a tendency to fall inward by receiving a rotational force in a direction indicated by an arrow in FIG. 6 with a connection end with the opening / closing handle 3 as a fulcrum. In some cases, the bent portions 18a and 25a
May come into contact with the partition wall 13a to generate abrasion powder or hinder the opening and closing operation. Therefore, as shown in FIG. 8, a connecting piece 32 for regulating the interval between the movable contacts 18, 25 is interposed between the ends of the movable contacts 18, 25. The connecting piece 32 of the resin molded product is divided into left and right parts as shown in the figure, and one shaft part 32a passes through a triangular window hole 33 formed in the case partition wall 13a and fits into the other hole part 32b. , Are integrated as shown in FIG. Since the left and right pieces of the connecting piece 32 are pressed inward by the above-mentioned rotational force, they are not separated from each other without providing a retaining means. The connecting piece 32 has flat surfaces at both ends abutting against the inner surfaces of the movable contacts 18 and 25 to prevent the movable contacts 18 and 25 from falling down, and two projections 32c are fitted into upper and lower cutouts of the spring hooking pieces 18b and 25b. Is positioned.

In FIG. 8, concave portions 32d are provided at both ends of the connecting piece 32, and the concave portions 32d are formed at the roots of the flexible conductors 19, 26 joined to the inner surfaces of the movable contacts 18, 25 by brazing. The portion, that is, the boundary portion between the joined portion where the brazing material has penetrated and solidified and the non-joined portion where it has not been solidified, is housed inside. The bases of the flexible conductors 19 and 26 move along with the opening and closing movements of the movable contacts 18 and 25, respectively.
When the wires 9 and 26 are repeatedly bent, they are liable to be broken or frayed due to stress concentration. In this case, by accommodating the root portion in the recess 32d, the bending is kept away from the hard / soft boundary between the flexible conductors 19 and 26, and phenomena such as disconnection and fraying are suppressed.

In FIG. 4, FIG. 7, and FIG. 9, the overcurrent trip element 20 is a strip-shaped bimetal 21, a fixed iron core 35 connected to the bimetal 21, and a rivet 34, and one end is rotatably supported via a pin 36. The armature 37 is a flat armature having the other end contacting portion 37a opposed to the fixed iron core 35, and a torsion for urging the armature 37 in a direction opposite to the fixed iron core 35 (counterclockwise in FIG. Return spring 38 composed of a spring
Consists of The fixed iron core 35 has a magnetic path having a U-shaped cross section composed of a flat substrate 35a having two bent steps and leg portions 35b formed on both sides at the lower end thereof. Is enclosed in the width direction. The substrate 35a and the armature 37 of the fixed iron core 35
A pair of left and right arms are bent at the upper end of
A pin 36 supporting the armature 37 is inserted through these arms, and a return spring 38 (FIG. 7) mounted on the pin 36 has one end hung on the arm of the fixed iron core 35 and the other end hung on the upper end of the armature 37. I have.

In FIG. 7, the armature 37 is urged by the return spring 38 to the side opposite to the fixed core 35 as described above, but a hook (not shown) engages with the leg 35b of the fixed core 35, It is held in a posture parallel to the bimetal 21. Armature 37 armature 3
7a, a stepped portion 37b is formed on the surface opposite to the fixed iron core 35 by extrusion using a press. Further, a screw hole 37c (FIG. 9) formed by threading a burring-processed hole is provided at a tip portion of the armature 37, and a hole 21a formed in the bimetal 21 is formed in the screw hole 37c.
39a of adjusting screw 39 which is loosely inserted and screwed
Is opposed to the bimetal 21 via a gap G (FIG. 7).

The overcurrent trip element 20 having the above structure is arranged on the same side as the latch 27 so that the plate surface of the armature 37 is along the case partition 13a, as shown in FIG.
Mounting pieces 35 integrally formed at both ends of a pin 36 protruding from the arm of the fixed iron core 35 and vertically and horizontally on the fixed iron core 35.
c, 35d, and 35e are elastically press-fitted into the recesses of the case partition wall 13a and positioned, and are pressed and fixed by the cover 14. The claw 27a of the latch 27 is always engaged with the step 37b of the armature 37. When a current flows through the bimetal 21 as indicated by an arrow in FIG. 9, the bimetal 21 bends leftward in FIG. 7 by the Joule heat and approaches the head 39 a of the adjusting screw 39.

At this time, when the bimetal 21 directly contacts the head 39a, the bimetal 21-adjustment screw 39-armature 37-pin 36-fixed iron core 35-bimetal 21
Is formed, the current flowing through the bimetal 21 decreases, a part of the heat required for the bending of the bimetal 21 disappears, and the tripping characteristics are affected. Therefore, here, as shown in FIG. 9, an insulating washer 40 made of fluororesin is used.
Is mounted below the neck of the adjusting screw 39 to achieve insulation between the bimetal 21 and the adjusting screw 39.

When the current flowing through the bimetal 21 is overloaded, the curved bimetal 21
The armature 37 is attracted to the fixed iron core 35 side via 9. As a result, the latch 27 is unlocked by the armature 37 after a lapse of time according to the current. When a large current such as a short-circuit current flows through the bimetal 21, the armature 37 is instantaneously attracted to the fixed iron core 35 by the magnetic flux passing through the U-shaped magnetic path of the fixed iron core 35 and the armature 37, and the armature 37 of the latch 27 is moved. Is released.

When the latch 27 is unlocked by the armature 37, the circuit breaker trips as described later, but the time (tripping characteristic) from the time when an overcurrent flows until the trip (tripping characteristic) depends on the level of the armature 37. It varies depending on the amount of engagement of the pawl 27a of the latch 27 with the portion 37b. On the other hand, in the latch 27 supported by the pin 28 at the end opposite to the claw 27a, the end on the claw 27a side easily swings laterally due to assembling play or temperature creep. Therefore, in order to obtain a stable tripping characteristic, the latch 2 having the claw 27a is formed.
It is preferable to hold the end of 7 and to suppress the horizontal runout.
Therefore, as shown in FIG. 10, a latch holder 45 is provided near the side surface of the latch 27 near the claw 27a with a slight gap therebetween. The latch retainer 45 is a resin molded product and has a shape shown in FIG. 11, and is fitted in a notch in a ridge 13b formed integrally with the case 13 in the direction of the arrow, and the tip of the latch retainer 45 is formed as shown in FIG. It overlaps with the tip portion, and holds down the lateral run-out of the latch 27.

Turn the adjusting screw 39 until the latch 27 is unlocked due to the bending of the bimetal 21, and turn the adjusting screw 39.
Adjust by changing. In order to make this adjustment possible with the cover 14 attached, as shown in FIG. 7, the cover 14 has an adjustment hole 41 in which the head 39a of the adjustment screw 39 faces.
Is provided. By inserting the driver 42 through the adjustment hole 41 and turning the adjustment screw 39, the tripping characteristics can be adjusted even after the wiring breaker 1 is assembled. Adjustment hole 4
As shown in FIG. 13, after adjustment, a cover plate 43 is attached to 1 via a hook 43a. In order to reliably prevent the cover plate 43 from falling off, it is preferable to attach an adhesive sheet 44 such as a main body nameplate to the cover 14 from above.

In the ON state of FIGS. 4 and 5, the movable contacts 18 and 25 are pivotally supported at the connection end with the opening / closing handle 3 by the tension from the opening / closing spring 30 spanned between the latch 27 and the movable contact 18. 4, and is pressed by the fixed contacts 4a and 11a. When the opening / closing handle 3 is tilted rightward in FIG. 4 with the pin 29 as a fulcrum from this ON state, the connecting end of the movable contacts 18, 25 with the opening / closing handle 3 changes the action line of the opening / closing spring 30 to the right in FIG. At the stage where the movable contacts 18 and 25 pass to the left, the rotational force acting on the movable contacts 18 and 25 is reversed in the counterclockwise direction, and the movable contacts 18 and 25 are separated from the fixed contacts 4a and 11a (off operation).

On the other hand, the latch 27 receives a rotational force from the opening / closing spring 30 in the clockwise direction in FIG. 4 with the pin 28 as a fulcrum. The latch 27 engages with the stepped portion 37b of the armature 37 in the state shown in the figure. Has been stopped. However, when the latch is released in the ON state as described above, the latch 27 rotates clockwise in FIG. 4, and the action line of the opening / closing spring 30 accordingly moves the opening / closing handle of the movable contacts 18, 25. The rotational force is reversed by shifting from the left side to the right side in FIG. 4 of the end of the connection with the movable contact 3, and the movable contacts 18, 25 are separated from the fixed contacts 4a, 11a (trip operation). The resetting of the circuit breaker 1 after the trip operation is performed by operating the opening / closing handle 3 to partially lift the latch 27 in the counterclockwise direction in FIG. 4 and re-engaging the latch 27 with the step portion 37b. .

The above is the configuration and operation of the two-pole one-element product. Next, referring to FIGS.
The operation will be described. Here, FIG. 14 is a side view of the right pole side of the circuit breaker 1, FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG. 14, and FIG. 16 shows the armature of the overcurrent trip element in FIG. FIG. In the two-pole two-element product, a second overcurrent trip element 46 is added to the right pole side (FIG. 5) of the two-pole one-element product, and the bimetal 47 and the movable contact 2 are added.
5 and the load-side terminal 12 are connected by lead wires 48 and 49, respectively, and the configuration of the terminal is the same as that of the two-pole one-element product.

The second overcurrent trip element 46 has substantially the same configuration as the first overcurrent trip element 20. However, as shown in FIG. 15, the return spring 50 moves the armature 51 to the fixed core 52 side. The difference is that the adjusting screw 53 is loosely inserted through the hole 51a of the armature 51 and is screwed into a screw hole (not shown) of the bimetal 47. An adjustment hole 54 is formed in the cover 15 so that the head of the adjustment screw 53 faces. Note that the second armature 51 does not require a step for locking the latch 27, but the first armature 37 can be used as it is to reduce the number of parts.

The second overcurrent trip element 46 described above
A fixed core base 52a is disposed on the right pole side along the case partition 13a, and both ends of the pin 55 and the fixed portion 52b of the fixed core 52 are connected to the case partition in the same manner as the first overcurrent trip element 20. After being fitted into the groove 13a and positioned, it is pressed down and fixed by the cover 15. As shown in FIG. 15, a transmission member 56 made of a resin-made cylindrical material is interposed between the first armature 37 and the second armature 51.

The transmission member 56 is slidably inserted into a cylindrical guide hole 57 (see FIG. 5) provided through the case partition wall 13a and receives the force of the return spring 50.
Is pushed by the armature 51 of the first armature 3
7 is in contact. Here, the first return spring 38
Is stronger than the second return spring 50,
The armature 37 is maintained in the position shown in FIG. 15 by the spring force of the first return spring 38 while receiving the spring force of the second return spring 50 via the transmission member 55,
The latch 27 is locked via 7b.

When a large current such as a short-circuit current flows in the circuit breaker for wiring, as shown in FIG. 16, the armatures 37 and 51 of the first and second overcurrent trip elements 20 and 46 are normally At the same time, it is sucked by the fixed iron cores 35 and 52, but when only the second armature 51 is sucked in advance,
The suction operation is transmitted to the first armature 37 via the transmission member 56, the latch 27 is released, and a trip is performed. On the other hand, when the first armature 37 is sucked in advance, a trip is performed regardless of the transmission member 55. Further, the bending of the second bimetal 47 is transmitted to the first armature 37 via the adjusting screw 53, the armature 51 and the transmission member 55, and a trip is performed.

FIG. 17 is a left side view of the circuit breaker for wiring having two poles and two elements shown in FIG. 14 in which a ground leakage trip element is provided and a cover of the earth leakage breaker is removed, and FIG. 18 is a right side view thereof. is there. In FIG. 17 and FIG.
Is a zero-phase current transformer 61 having conductors 22 and 49 as primary conductors connecting the overcurrent tripping elements 20 and 46 and the load-side terminals 5 and 12, respectively. 2
A leakage detection circuit 62 for amplifying the next output, a trip coil unit 64 driven by the output of the leakage detection circuit 62 to attract the plunger 63 (FIG. 17) against a return spring (not shown), and a suction operation of the plunger 64 And a tripping lever 65 for moving the armature 37 of the overcurrent tripping element 20 to the fixed iron core 35 side in conjunction therewith.

The conductors 22 and 49 are formed by bending a Z-shaped punched plate conductor, and have one end connected to the load-side terminals 5 and 1.
23, and the other end is joined to the bimetals 21 and 47 as shown in FIG.
Are fastened with screws 67. The fixed end of the test circuit contact 68 is sandwiched between the conductor 22 and the relay conductor 66, and is simultaneously tightened. The test circuit contact 68
Pressing operation is performed by a test button 69 shown in FIG.
In FIG. 24, a test button 69 having a slit 69a cut therein is elastically pushed into a guide hole 70a of a button base 70, is stopped at a bulge portion at the tip, and is held vertically movable. The button base 70 is connected to the case partition 13 via a pair of mounting legs 70b each having a hook at the tip.
a.

FIG. 19 is a circuit diagram showing an electric leakage display mechanism in FIG.
7, the overcurrent trip element 20 and the zero-phase current transformer 61 are removed. In FIG. 19, an electric leakage display mechanism 71 includes an electric leakage display piece 72 that is long in the vertical direction in the figure and a case partition wall 13a.
And a display latch 73 rotatably supported by a support shaft integrally projecting therefrom. The leakage display piece 72 is slidably inserted into the groove on the left pole side of the case partition wall 13a, and the display portion 72a of the head projects from the case 13 by a spring 74 made of a compression coil spring (upward in FIG. 19). However, the display unit 72a is always locked by the trip lever 65 so that the display unit 72a is kept in the state shown in FIG. On the other hand, the display latch 73 is urged in the counterclockwise direction in the figure by a spring (not shown), but is normally locked by the reset projection 27b of the latch 27 and held in the illustrated position. 72 are recessed. The end faces of the left and right arms bent at both ends of the upper end portion of the fixed iron core 35 of the overcurrent trip element 20 are close to the short circuit display piece 72 and the display latch 73, and they are the groove and the support shaft of the case partition wall 13a. From each other.

FIG. 21 is an enlarged sectional view of a main part along the line XXI-XXI in FIG. In FIG. 21, a tripping coil 76 is arranged so as to surround a fixed iron core 75 and a plunger 63 which are always opposed to each other, and an applied voltage type trip coil unit 6 in which a magnetic path is formed by a gate-shaped yoke 77.
Reference numeral 4 is fixed to the case partition 13a by a screw (not shown). A trip lever 65 made of a mold resin is rotatably supported by a pair of left and right arms 77a formed by bending a yoke 77 via projecting shafts integrally formed on both the left and right sides.

The upper end 65a of the trip lever 65 in the drawing is formed in a hook shape, engages with the projection 72a of the leakage indicator 72, and is urged upward by the spring 74 as described above. 72 is held. The lower end 65b of the trip lever 65 is opposed to the lower end of the armature 37 in close proximity. The plunger 63 is loosely engaged with the trip lever 65 at the left end in the figure, and is urged leftward in the figure by a spring (not shown).

In FIG. 17, when the current flowing through the primary conductors 22 and 49 of the right and left poles passing through the zero-phase current transformer 61 becomes unbalanced due to the occurrence of electric leakage, the current is output to the secondary side of the zero-phase current transformer 61. Occurs, and when the level exceeds a predetermined value, a trip signal is output from the electric leakage detection circuit 62 and the trip coil 76 of the trip coil unit 64 is excited. Then, as shown in FIG. 22, the plunger 63 is sucked, and the trip lever 65 rotated clockwise thereby moves the armature 37 to the fixed iron core 35 side. As a result, the latch 27 is unlocked and pivots as shown in FIG. 20, and the movable contacts 18, 25 are separated as described above. At the same time, the leakage indication piece 7 by the trip lever 65
2 is released, and the display latch 73 unlocked by the latch 27 is rotated counterclockwise to disengage from the electric leakage display piece 72, and the electric leakage display piece 72 is
, The display portion 72a projects from the case 13 to indicate the occurrence of the earth leakage trip. In the case of a trip due to an overcurrent, the display latch 73 is connected to the leakage indicator 7.
However, since the lock by the trip lever 65 is not released, the earth leakage trip display is not performed.

When the tripping operation of the earth leakage circuit breaker shown in FIG. 20 is reset by the above-described operation and the latch 27 is rotated in the counterclockwise direction in the figure, the display latch 73 is interlocked therewith.
Rotates clockwise, and pushes down the electric leakage display piece 72. As a result, the trip lever 65 is engaged with the electric leakage display piece 72 again, and the electric leakage display mechanism 71 is reset at the same time. In order to test the above trip operation, in FIG.
Press the test button 69 down. Here, a resistance element 78 is fixed below the test circuit contact 68, one terminal of which is opposed to the free end of the test circuit contact 68, and the other terminal is connected to the right terminal 1 via a lead wire (not shown). Next conductor 4
9 is connected near the terminal 12. Then, when the test button 69 is depressed to bring the test circuit contact 68 into contact with the terminal of the resistance element 78 as a fixed contact, the left and right pole primary conductors 22 and 49 are short-circuited across the zero-phase current transformer 61. . As a result, imbalance occurs in the current flowing through each of the primary conductors 22 and 49, and a trip operation is performed.

FIG. 25 shows a structure in which the latch 27 is pressed so as not to rise from the case partition 13a. That is, an arc-shaped projection 35 d is integrally formed on the leg 35 b formed by bending at both ends of the lower end of the fixed core 35 of the overcurrent trip element 20. The projection 35d is close to the side surface of the latch 27 as shown in the figure. Hold down.

In the above-described embodiment of the earth leakage breaker, the overcurrent tripping element has two elements.
Of course, an overcurrent trip device having a single element can be used. In this case, the fixed iron core 52 (FIG. 18) of the overcurrent trip element 46 on the right pole side is left as it is, and
It is preferable that a conductor such as a brass plate is fixed instead of 7, and the primary conductor 49 is connected to the brass plate via the relay conductor 66. The movable contact 25 and the brass plate are connected by a flexible conductor 48 as in the case of two elements.

FIGS. 26 and 27 show a circuit breaker with a built-in alarm switch. In FIG.
The alarm switch 78 composed of a micro switch is disposed along the case partition 13a by fitting two mounting holes for screw fitting into a projection 79 integrally formed so as to protrude laterally from the case partition 13a. Have been. The alarm switch 78 is restrained in a state where the actuator 78a is normally pushed by the tip of the latch 27 locked to the armature 37 and the push button 78b is pushed. The lead wire 78c of the alarm switch 76 is drawn out through the groove of the case 13. Alarm switch 78 is case 1
The case partition 1 is provided by a cover 14 (FIG. 7) attached to the cover 3.
3a and is fixed.

FIG. 27 shows a trip state.
When an overcurrent occurs, the latching of the latch 27 by the armature 37 is released, and the latch 27 is rotated clockwise in FIG. Therefore, the actuator 78a separates from the latch 27, and the released push button 78b protrudes. As a result, the contact of the alarm switch 78 is switched, and a trip signal is sent to the outside via the lead wire 78c. The circuit breaker of the configuration shown can obtain a trip signal only by adding a standard microswitch, and the alarm switch 78 can be provided along the case partition 13a without changing the 25 mm width contracted size. Can be built-in.

[0053]

According to the present invention described above, the following effects can be obtained. (1) The two-pole, one-element and two-pole, two-element switching and overcurrent tripping elements are integrated within the common width dimension, eliminating the need for a 100 V circuit block terminal and a 200 V circuit. A single circuit breaker can be used, and the distribution board can be reduced and the wiring work can be simplified. Further, by incorporating the earth leakage trip element into the wiring breaker, it is possible to easily configure an earth leakage breaker having the same external dimensions as the wiring breaker. (2) In that case, the left and right poles are separately arranged on both sides of a case having a partition wall at the center, and the constituent members of the movable contact and the overcurrent trip element are flat plates, and these members are flat surfaces. Since it is configured to be stacked and assembled on both sides of the case partition wall along the case partition wall, the width dimension can be reduced without difficulty, and the insulation between the left and right poles is sufficiently ensured. (3) For the two-pole two-element product, a second overcurrent trip element is added to the neutral pole side of the one-pole one-element product, and the operation of the second overcurrent trip element is controlled by the first through the transmission member. The overcurrent trip element is transmitted to the two-pole / one-element product and the two-pole / two-element product is easily rearranged.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is an internal front view of a distribution board using the circuit breaker of FIG. 1;

FIG. 3 is an enlarged view of a portion P in FIG. 2;

FIG. 4 is a side view of the left pole side in a state where a cover of the circuit breaker of FIG. 1 is removed.

5 is a side view of the right pole side with the cover of the circuit breaker of FIG. 1 configured as a two-pole one-element product removed.

6 is a sectional view taken along the line VI-VI in FIG.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is an exploded perspective view of a movable contact portion in FIG.

FIG. 9 is a schematic enlarged perspective view of the overcurrent trip element in FIG.

10 is a main part side view showing a state where an overcurrent trip element is removed from FIG. 4;

11 is an enlarged perspective view of a main part of FIG.

FIG. 12 is a sectional view taken along the line XII-XII of FIG. 10;

FIG. 13 is an enlarged view of a main part of FIG. 7.

14 is a side view of the right pole side with the cover of the circuit breaker of FIG. 1 configured as a two-pole two-element product removed.

15 is a cross-sectional view taken along the line XV-XV in FIG.

16 is a diagram illustrating a state in which the armature in FIG. 15 is sucked.

FIG. 17 is a side view of the left pole side with the cover of the earth leakage breaker showing the embodiment of the present invention removed.

18 is a right pole side view of the earth leakage breaker of FIG. 17 with the cover removed.

19 is a diagram in which a part is omitted from FIG. 17.

FIG. 20 is a diagram in which a part is omitted from FIG. 18;

FIG. 21 is a cross-sectional view of FIG. 17 taken along the line XXI-XXI.

FIG. 22 is a diagram when the trip coil unit in FIG. 17 operates.

23 is an exploded perspective view showing a connection configuration between a conductor and a bimetal in FIG. 17;

24 is an exploded perspective view showing an attachment configuration of the test button in FIG.

FIG. 25 is a fragmentary cross-sectional view showing a configuration in which a latch is pressed by a fixed iron core of an overcurrent trip element.

26 is a side view showing an embodiment in which an alarm switch is incorporated in the circuit breaker of FIG. 4;

27 is a diagram showing a state in which the wiring breaker of FIG. 26 has tripped.

FIG. 28 is an external perspective view of a wiring breaker showing a conventional example.

29 is an internal front view of a distribution board using the circuit breaker of FIG. 28.

30 is an enlarged view of a portion Q in FIG. 29.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker for wiring 3 Switching handle 4 Power supply terminal 5 Load side terminal 6 Distribution board 11 Power supply terminal 12 Load side terminal 13 Case 13a Case partition 14 Cover 15 Cover 18 Movable contact 19 Conductor 20 Overcurrent trip element 21 Bimetal 22 Conductor 25 Movable contact 26 Conductor 27 Latch 27a Claw 30 Opening / closing spring 32 Connecting piece 35 Fixed iron core 37 Armature 38 Return spring 39 Adjustment screw 40 Insulation washer 45 Latch presser 46 Overcurrent tripping element 47 Bimetal 48 Conductor 49 Conductor 50 Return Spring 51 Armature 52 Fixed core 53 Adjusting screw 54 Adjusting hole 56 Transmission member 60 Leakage trip element 61 Zero-phase current transformer 62 Leakage detection circuit 63 Plunger 64 Trip coil unit 65 Tripping lever 68 Test circuit contact 9 test button 71 leak display mechanism 72 leakage indicating piece 73 display latch 75 fixed iron core 76 releasing coil 77 yoke 78 alarm switch

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideki Koyama 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (56) References JP-A-4-36921 (JP, A) Showa 53-56565 (JP, U) Actually open Showa 56-75454 (JP, U) Actually open Showa 56-120624 (JP, U) Actually open 4-98241 (JP, U) Actually open 7-41945 (JP) , U) Tokuhyo Hei 6-511596 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 73/26 H01H 73/06 H02B 1/42

Claims (11)

(57) [Claims] 1. A case having a substantially I-shaped cross-section having a partition wall in the center, a body of an insulator comprising left and right two-pole covers combined on both sides of the case, and a pair of left and right legs. An opening / closing handle rotatably connected to the case across the partition wall with a leg portion, and a plate surface disposed on both sides of the case partition wall along the case partition wall, and one end rotatable with the leg portion of the opening / closing handle. And a flat bilateral movable contactor having a movable contact attached to the other end thereof, a strip-shaped bimetal, a flat base body and legs bent on both sides thereof and having a U-shaped cross section. A fixed armature having a path and surrounding the bimetal in its width direction at both leg portions, a flat armature supported at one end in a rotatable manner in parallel with the bimetal, and an armature at the other end facing the fixed iron core; And this armature An overcurrent trip element disposed on one side of the partition so that a plate surface of the armature is along the case partition. Arranged between the partition and the overcurrent trip element so as to be along the case partition, and is rotatably supported by the case at one end, and has a claw projecting laterally at the other end, A flat latch latched to a step on the side of the armature with the claw; and a latch disposed between the case partition wall and the left and right two-pole movable contacts, respectively, between the movable contact and the latch. A left / right two-pole open / close spring composed of a tension spring that is bridged, and provided on the overcurrent trip element, loosely penetrating the bimetal or armature, screwed into the armature or bimetal, and having a head gap. An adjusting screw opposed to the bimetal or the armature via a fixed contact opposed to the movable contact, and terminals are integrally formed, and fixed contacts having left and right two poles respectively arranged on both ends of one end of the case partition wall Left and right 2 respectively arranged on both sides of the other end of the case partition wall
A pole terminal, and a conductor connecting between the one end of the bimetal and the movable contact of the overcurrent trip element and the other end of the bimetal and the terminal on one side of the case partition, respectively. A circuit breaker, comprising: a conductor connecting between the movable contact and the terminal on the other side of the case partition. 2. A case having a substantially I-shaped cross section provided with a partition wall at the center thereof, an insulator main body comprising left and right two-pole covers combined on both sides of the case, and a pair of left and right legs. An opening / closing handle rotatably connected to the case across the partition wall at a portion thereof, and a plate surface disposed on both sides thereof along the case partition wall, and one end rotatably connected to a leg of the opening / closing handle. A U-shaped cross-section magnetic path comprising a flat bilateral movable contactor having a movable contact attached to the other end, a strip-shaped bimetal, a flat base, and legs bent on both sides thereof. A fixed armature that surrounds the bimetal in its width direction at both legs, a flat armature that is rotatably supported at one end in parallel with the bimetal, and that has an armature at the other end facing the fixed iron core; This armature A first overcurrent trip element, comprising a return spring for urging the armature to the side opposite to the fixed core, wherein the first overcurrent trip element is arranged on one side of the partition so that the plate surface of the armature is along the case partition. It has a U-shaped magnetic path composed of a strip-shaped bimetal, a flat base and legs bent on both sides thereof, and a fixed iron core surrounding the bimetal in its width direction at both legs, parallel to the bimetal. , One end of which is rotatably supported, the other end of which comprises a flat armature facing the fixed core and a return spring for urging the armature toward the fixed core, and a plate of the base of the fixed core. A second overcurrent trip element disposed on the other side of the partition so that a surface is along the case partition; and the first and second overcurrent trip elements penetrating the case partition. A A transmission member inserted between the armature and the armature for transmitting the armature suction operation of the second overcurrent tripping element to the armature of the first overcurrent tripping element; and a plate surface along the case partition wall. Disposed between the partition wall and the overcurrent trip element, rotatably supported at one end by the case, and having a claw projecting laterally at the other end. A flat latch latched to a step on the armature side surface of the overcurrent trip element of claim 1; and the movable contact and the latch disposed between the case partition and the left and right movable contacts, respectively. Left and right two-pole open / close springs composed of tension springs stretched between the first and second overcurrent trip elements, respectively, and loosely penetrating the bimetal or the armature to allow the armature or First and second adjusting screws which are screwed into the metal plate and whose head faces the bimetal or the armature via a gap; fixed contacts facing the movable contacts are attached and terminals are integrally formed; Left and right two-pole fixed contacts arranged on both sides of one end of the case, and two left and right poles arranged on both sides of the other end of the case partition wall, respectively.
A pole terminal is connected between one end of the bimetal of the first overcurrent trip element and the movable contact and between the other end of the bimetal and the terminal on one side of the case partition. And one end of the bimetal of the second overcurrent trip element and the movable contact and between the other end of the bimetal and the terminal on the other side of the case partition. A circuit breaker comprising: a conductor. 3. A two-pole conductor connecting left and right terminals between the overcurrent trip element and the movable contact and the terminal on both sides of the case partition, or between the first and second overcurrent trip elements and the terminal. A zero-phase current transformer having primary conductors of left and right two-pole conductors connecting the two, a leakage detection circuit for amplifying the secondary output of the zero-phase current transformer, and a drive driven by the output of the leakage detection circuit A trip coil unit that attracts the plunger against the return spring, and the armature of the overcurrent tripping element or the armature of the first overcurrent tripping element in the fixed core side in conjunction with the attraction operation of the plunger. 3. The circuit breaker according to claim 1, further comprising an earth leakage trip element comprising a trip lever to be moved. 4. It is provided slidably along the case partition,
A leakage indicator piece in which the display portion of the head is urged by a spring in a direction protruding from the case and is always locked by a trip lever so that the display portion is held inside the case; And a display leakage mechanism comprising: a display latch that moves the leakage display piece against the spring in conjunction with the reset operation of the latch, and that re-engages the trip lever. 3. The circuit breaker according to 3. 5. A projecting portion extending toward the case partition is integrally formed on both legs of the fixed core of the overcurrent tripping element or the first overcurrent tripping element, and the latch is directed toward the case partition by the projecting portion. Claim 1 characterized by being made to hold down.
The circuit breaker according to claim 4. 6. A connecting piece which penetrates through an opening formed in the case partition wall between ends of the movable contact having two poles on the movable contact side, and both ends of which are fitted to the ends of the movable contact, respectively. The circuit breaker according to any one of claims 1 to 5, wherein the circuit breaker is interposed. 7. The circuit breaker according to claim 6, wherein a concave portion is provided at an end of the connecting piece for accommodating a base portion of the conductor joined to the movable contact. 8. The circuit breaker according to claim 1, wherein an insulating material is inserted between a head of the adjusting screw and a bimetal or an armature facing the adjusting screw. 9. The circuit according to claim 1, wherein the head of the adjusting screw is located on the cover side, and the cover has an adjusting hole facing the head. Circuit breaker. 10. A latch retainer facing a side surface of the latch with a slight gap in the vicinity of the claw is provided by being fitted into a case partition wall, and the latch retainer is fixed by being pressed by a cover. The circuit breaker according to claim 9. 11. An alarm switch comprising a micro switch is provided along a case partition so as to interlock with a latch,
3. The circuit breaker according to claim 1, wherein the alarm switch has a mounting hole fitted to a projection formed on the case partition wall, and is fixed by being sandwiched between the case partition wall and the cover.