JPS63292545A - Breaker - Google Patents

Abstract

PURPOSE:To facilitate assembly and eliminate any retaining means for a spring by coupling a movable contact piece with a contact pressure spring using a projection provided at the movable contact piece, and by constructing the retaining means for spring so that the top of the protrusion is energized in the direction of pole opening of the movable contact piece. CONSTITUTION:A protrusion 27B larger than the thickness of a contact pressure spring 28 is provided at the base of a movable contact piece 27, and in correspondence to this protrusion 27b the contact pressure spring 28 is furnished with a mounting hole 28a. This mounting hole 28a is set in the protrusion 27b and caulked fast, and the movable contact piece 27 is coupled with the contact pressure spring 28. A spring 35 is interposed between the oversurface of the base of contact pressure spring 28 and the undersurface of a yoke 32 constituting a shortcircuiting sensor, and the small dia. bottom of this spring 35 is held at the upper part of the protrusion 27b. That is, the protrusion 27b serves both holding and slipoff prevention of the spring 35. This facilitates location of lief spring, enhances the processing easiness, enhances the accuracy, and eliminates use of any separate holding means.

Description

[Detailed Description of the Invention] Technical Field 1 The present invention relates to a breaker such as a remote control breaker that can be remotely operated.

[Background Art j] Fig. 9 shows a portion of a movable contact 102 used in a breaker such as a remote control breaker capable of remote control of this type. The movable contact 10 is rotatably supported on the shaft.
2, there is a movable contact 1 facing the identification contact 104 on the lower surface of the tip.
03 is fixed, and a contact pressure spring 105 is attached to the movable contact 103 side.
As a result, an appropriate contact pressure is applied to the movable contactor 102. Moreover, an opening spring +0 is provided on the upper surface of the base of the movable contact 102
6 is arranged, and this opening spring 106 connects to the movable contact 102.
The direction of clockwise rotation, that is, tangent, 103.1 (
M is biased in the direction of opening. In such a conventional example, since the contact pressure spring 105 and the movable contact 102 are not coupled, there is a problem in that it is difficult to assemble. Further, there was a problem in that the opening spring t06 had to be provided with a separate holding means.

[Objective of the Invention 1] The present invention has been provided in view of the above-mentioned points, and includes a movable contact and a contact pressure spring that are interposed by a protrusion protruding from the movable contact, and a movable upper part of the protrusion. It is an object of the present invention to provide a breaker that is easy to assemble and does not require a spring body holding means by using a contactor as a holding means for a spring body that is applied in the direction of opening.

1 Disclosure of the Invention 1 (Structure) The present invention comprises a movable contact that contacts a movable contact that is pressed into contact with a forged handle and is fixed at its tip to an opposing identification contact, and an appropriate contact when both contacts make contact. A leaf spring that applies pressure and an electromagnetic force that flows to the short circuit coil when a large current is detected at the time of short circuit current.J: A short circuit sensor that drives the litresop mechanism and urges the movable contact in the direction that both contacts open. In this breaker, a movable contact (f) is attached to the lower surface of the tip of the N-f movable contact whose approximately central portion is pivotally supported, and is located above the movable contact and on the same level as the movable contact. A mounting hole is drilled in the base of the leaf spring arranged in the direction, and a protrusion higher than the thickness of the leaf spring is provided on the upper surface of the base of the movable contact. At the same time as driving the Triumph camera mechanism, a short-circuit sensor having a drive pin that touches the two protrusions is placed on one side of the base of the movable contact, and the lower surface of the short-circuit sensor and the - side of the base of the movable contact are arranged. By holding the lower end of a spring body disposed between the movable contact and biasing the movable contact in the direction of opening the contact on the protrusion, the mounting hole of the contact pressure spring can be attached to the protrusion of the movable contact. The contact pressure spring is fixed to the movable contact to connect the contact pressure spring and the movable contact, and the lower end of the spring body is held by a protrusion so that the protrusion also serves as a holding means for the spring body. Furthermore, in the event of a short circuit, the lower end of the drive pin, which is attracted and driven downward by the short circuit coil, is brought into contact with the protrusion, which applies force to the movable contact in the direction of opening the contact, and the movable contact can be quickly moved. The contact point is forcibly opened by rotating the contact point.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an exploded perspective view of the entire breaker, and the breaker of the present invention is composed of an electromagnet block A and a contact opening/closing mechanism section B controlled by the electromagnet block A.

Additionally, this breaker has a three-pole structure for three phases.

First, the electromagnet block A will be explained.

A box-shaped mounting base 1 with an open top and an insulation shrine.
A storage recess 2 is formed inside the storage recess 2, and an electromagnet section (2) is housed in the storage recess 2. The fixed core 6 is formed into a substantially U-shape, and the core portions 6a on both sides are inserted through the insertion holes 8a of the damper 8. The core portion 6a is inserted into the through hole 4a of the coil boppin 4 so that its end surface slightly protrudes from the opening surface.The movable core 7 is fixed within a U-shaped fixed plate 9, and is movable. A spring 1 is installed between the iron core 7 and the coil boppin 4.
Distribution Ml with 0 interposed? It will be done. The spring 10 is mounted on a protrusion 41 projecting between the upper and lower protrusions 4c of the coil boppin 4.

The conversion shaft 11, which is formed in a substantially U-shape, converts the horizontal movement of the movable iron core 7 into the vertical direction, and the pongee 13 is inserted into a shaft hole 11a bored in the axial direction. Both ends of the shaft 13 are supported within grooves 14a formed on the upper surface of the stepped portion 14 of the mounting base 1, making the conversion shaft 11 rotatable. The hole 12a of the central protrusion 12 protruding from the center of the conversion shaft 12 and the hole 17a of the connecting piece 17 formed on the fixing plate 9 form a U-shape after the 1-shaped pin 16 is inserted. The conversion shaft 11 is rotatably connected to the movable iron core 7 side by a pin 16 . Also, one end 1) of the connecting pin 18 is inserted into the hole 15a of the side piece 15 formed on both sides of the conversion shaft 11.
1a are inserted through and connected to each other. Thus, the electromagnet portion 3 configured in this manner is housed in the storage recess 2 of the handle 1 base 1 with the gun bar 19 provided on the side surface of the fixed iron core 6. A terminal storage portion 20 is formed at the end of the mounting base 1 on the side of the storage recess 2. A cutout portion 21 is formed in this terminal storage portion 20, and an auxiliary terminal 22 is formed in this cutout portion 21. is now installed.

Next, the contact opening/closing mechanism section B will be explained. The upper surface of the body 23 made of an insulating material is provided with a mechanism housing section 2 through a partition wall 24.
Three 5's are formed. Three holes 26α are formed in the interlocking plate 26 made of an insulating material and interlocking the three poles.
The movable contact 27 and the contact pressure spring 28 are inserted through the 6 m. A protrusion 261) is integrally provided on the lower surface of the interlocking plate 26, and the upper part of the opening spring 29 that urges the interlocking plate 26 upward is attached to the protrusion 261). As shown in FIG. 6(I), it is housed in a recess 30 formed in the body 23. The interlocking plate 26 is the body 2
It is inserted into the slit 31 of the partition wall 24 of No. 3 and arranged so as to span each mechanism housing section 25.

A short-circuit sensor for detecting overcurrent and short-circuit current is arranged in the mechanism storage part 25. A short-circuit coil 33 is provided in a yoke 32 bent into a substantially F-shape. A drive pin 34 that can protrude from the upper and lower surfaces of the yoke 32 is attached to the yoke 32. Movable contact 36 on the bottom surface of the tip
The base of the movable contact 27 and the base of the contact pressure spring 28 are fixed together by caulking, and the contact pressure spring 28 is fixed to the movable contact 2.
It is located above 7. A conical spring 3 is provided between the lower surface of the yoke 32 and the upper surface of the base of the contact pressure spring 28, etc.
5 is interposed.

That is, as shown in FIGS. 1 and 8, a protrusion 2 larger than the thickness of the contact pressure spring 28 is provided at the base of the movable contact 27.
71) is provided protrudingly, and a contact pressure spring 2 is provided corresponding to this protrusion 27b.
8 has a mounting hole 28a drilled therein. This protrusion 27b is work-hardened by, for example, doweling processing, and this protrusion 27b is
By applying the lower end of the drive pin 34, which will be described later, in 1), the movable contact 27 itself is not contacted, so that deformation of the movable contact during forced opening is prevented. The mounting hole 28a of the contact pressure spring 28 is inserted into the protrusion 271) of the movable contact 27 and fixed by caulking to connect the 01 movable contact 27 and the contact pressure spring 28. The lower end of the small diameter of the spring 35, which is interposed between the upper surface of the base of the contact pressure spring 28 and the lower surface of the yoke 32 constituting the short circuit sensor, is held by the upper part of the projection 271). In other words, protrusion 271)
holds the spring 35 and prevents it from being removed. The spring 35 biases the movable contact 27 in the direction of opening. In other words, the movable contactor 27 moves around the protrusion 37a (Fig. 2) engaged with the four parts 27a formed on both sides of the approximate center, but is biased clockwise by the spring 35. .

In this way, when the movable contactor 27 and the contact pressure spring 28 are integrated, the protrusion 271) can be easily positioned, improving workability and increasing accuracy.

I-shaped mounting pieces 37 are integrally formed from both sides of the lower part of the yoke 32, which constitutes a magnetic circuit with the shorting coil 33, and projections 37a are integrally provided on the inner sides of both mounting pieces 37. The movable contact 27 is formed with four parts 27a whose lower surface is concave upward in the approximate center of the movable contact 27.
engage the projections 37a of the mounting piece 37.

At this time, the movable contactor 27 and the contact pressure spring 28 are connected to the interlocking plate 26.
As shown in FIG.
Center a and 1. receives a clockwise force. Further, as shown in FIG. 5(1)), since the base of the movable contact 27 is urged downward by the spring 35, the protrusion 37a
receives a clockwise force around the axis. Further, an arc horn 38 with a U-shaped tip is provided from one end of the yoke 32, and a bimetal 38 that detects overcurrent is provided at the other end.
9 is the setting. A current Il is applied to the tips of the three bimetals.
l Neno 40 for maintenance is hinged.

The seven frames 41 formed in a substantially U-shape are shown in FIG. 6(a).
It is fixed to the body 23 by screws 42 from the bottom surface of the body 23, as shown in FIG. Nine arc-shaped elongated holes 44 are formed in the side plates 43 of the frame 41, and a U-shaped latch plate 48 and legs 46 of a substantially H-shaped link 45 are positioned on the outer surface of the elongated holes 44. The hole 46a of the leg portion 46 and the latch plate 4
8, and a rotating shaft 50 in the long hole 44 of the frame 41.
is inserted, and the link 45 and the latch plate 48 are rotatably connected to the 7-frame 41 by this rotating shaft 5 ( ). On the other hand, a hole 481) is bored in the approximate center of the side piece 48a of the latch plate 48, and a latch plate is provided between the shaft support piece 51 extending upward from the lower part of the seven frames 41 and the side plate 43. The side piece A 8a of 48 is located, and the hole 51 of the shaft support piece 51 is located.
a, the hole 481 of the latch plate 48), and the hole 41a of the side plate 43
By inserting the pin 52 through the pin 52, the latch plate 48 is rotatably supported by the seven frames 41 about the pin 52.

A shaft support 53 formed in the center of the latch engagement plate 53
a is located between the protruding pieces 54 formed on the rear side of the frame 41, and the pin 55 is located between the hole 54a of the protruding piece 54 and the latch engagement plate 5.
The L1 latch engagement plate 53 is inserted into the hole 531) of the shaft support 53a of No. 3 and is rotatably supported around a pin 55 inserted through the protrusion 54 of the frame 41. Three engaging portions 56 are protruded from the front side of the latch engaging plate 53, and these engaging portions 56 are connected to the head portion of the drive pin 34 as shown in FIG. 5(a).
4a and engages with the head 348. Also,
A retaining piece 57 with an I-shaped tip is protruded from the lower surface of the latch engagement plate 53, and this retaining piece 57 is attached to the latch plate 48.
The engagement L1 launch engagement plate 53 and the launch plate 48 engage with the engagement recess 58 formed in the center piece 48c.

On the rear surface 53c of the latch engagement plate 53, there is located a wire 40 attached to the tip of the bimetallic material 9, and depending on the amount of protrusion of the wire 40 toward the latch engagement plate 53, the magnitude of the overcurrent that causes the U-tube operation is determined. can be adjusted. An arm piece 59 is formed on the front side of the 7-frame 41, and a hole 59a is bored at the tip of the arm piece 59. The lower part of the handle 60 is located between the arm pieces 59, and the hole 6 drilled in the handle 60
The handle shaft 61 is inserted into the frame 41 through the hole 59a of the arm piece 59, and the handle shaft 61 is inserted through the hole 59a of the arm piece 59.
It is mounted so that it can rotate freely around the axis. A protrusion 601+ is protruded from the side surface of the handle 60, and this protrusion 60I)
One end of a reversing spring 62 that positions the off position and on position of the handle 60 beyond the dead center is locked. Incidentally, the latch plate 48, the latch engagement plate 53, etc. constitute a trip a mechanism.

The protrusions 64a protruding from both sides of the auxiliary contact device 64 are engaged with the notch 63 formed at the upper end of the frame 41, so that the auxiliary contact device 64 is disposed at the top of the frame 41. ing. Handle 6 of auxiliary contact device 64
At the bottom of one fixed plate 65a located on the 0 side, there is a mark shown in
As shown in a), the auxiliary identification contact 66 is fixed,
A conductive auxiliary contact spring 67 whose tip is located up to the handle 60 is provided on the lower surface of the other fixed plate 65b. Furthermore, a projection 60c for pressing the auxiliary contact spring 67 is integrally formed on the side surface of the handle 60 above the auxiliary contact spring 67. As shown in FIG. 5(,), the handle 60
When turned to the on position, the protrusion 60C separates from the auxiliary contact spring 67 and returns upward due to the restoring force of the auxiliary contact spring 67 itself, thereby closing the auxiliary contact spring 67 with the auxiliary identification contact 66. Further, when the handle 60 is in the off position as shown in FIG. 5(c), the protrusion 60 of the handle 60
C presses the tip of the auxiliary contact spring 67 downward to separate the auxiliary contact spring 67 from the auxiliary identification contact 66, so that the auxiliary contact spring 67 and α66 are opened after being auxiliary fixed. The handle 60 is provided with a pressing piece 68 that presses the link 45 downward to set the link 45 to the initial position when the handle 60 is set to the off position, as shown in FIG. 6(c).
is formed.

The electromagnet block A and the contact opening/closing mechanism section B are connected as follows. That is, the partition wall 24 is attached to the body 23.
A through hole 69 is bored through the upper and lower surfaces of the body 23, and the connecting pin 18 is inserted into this through hole 69, and one end 18a of the connecting pin 18 is inserted into the hole 1 of the conversion shaft 11.
5a, and the other end 181 of the pin 18 is inserted into the hole 47a of the arm piece 47 of the link 45.
7 (by which the conversion shaft 11 and link 45 are connected by a force l.

With these connecting structures, the horizontal movement of the electromagnet part 3 is converted into a vertical movement by the connecting pin 18, and the movement of the electromagnet part 3 is transmitted to the link 45.

A terminal section 70 on the power supply side is provided at one end of the mechanism storage section 25. This terminal portion 70 is composed of a terminal screw 7()a, a tightening plate 701), a terminal plate 70c, and the like. The tip of the terminal plate 70c and the lower end of the shorting coil 33 are fixed,
A wire element 71 is connected between the upper end of the short-circuiting coil 33 and the upper end of the bimetal 39, and a lower part of the bimetal 39 is connected to the base of the movable contact 270 via a wire element 72.

A load-side terminal portion 73 is disposed on the other side of the mechanism housing portion 25 . The terminal portion 73 includes a terminal screw 73a1, a tightening plate 73b,
It is composed of a terminal plate 73c and the like.

A circular arc portion 73d curved in an arc shape is formed on both sides of the inside of the terminal plate 73c. An arc horn 74 is provided on the front side of 3d. Also, the arc part? An identification contact 75, which faces the movable contact 36, is fixed to the second part of the terminal plate 73c inside the terminal plate 3d. Also, the terminal board? Circle lA part in 3c? 3d is formed by the electromagnetic force generated by the current flowing through the arc portion 73d, which urges the arc generated when the contact 36.75 is opened toward the arc extinguishing device 76 to quickly extinguish the arc. Thus, the movable contactor 27 is opened quickly. 'lr'l arc device 76 is 2
It is composed of two side plates, a plurality of grid plates 78 arranged in parallel between the two side plates 76, an insulating plate 79 covering these, and the like. Here, both arc horns 38°74 are shown in Fig. 5 (
As shown in a), it is arranged in parallel with the grinding plate within the insulating plate 79.

A cover 80 covering the upper surface of the body 23 is made of an insulating material,
A window hole 81 is bored approximately in the center of the handle 60 so that the operating portion 60d of the handle 60 protrudes from the top surface. Also, window hole 8
A display window 82 from which a display protrusion 26c protruding upward from the interlocking plate 26 can be freely projected is provided on the side of the interlocking plate 26. If the display protrusion 26c does not protrude from the display window 82, it indicates that the movable contact 36 and the identification contact 75 are closed, that is, the main circuit is connected. , the movable contact 36 and the identification contact 75
This indicates that the terminal is open, that is, the main circuit is cut off. In addition, notches 8 are provided at both ends of the cover 80, respectively.
3 is formed, and each terminal portion 70 .
73 is positioned as shown in FIG.

Furthermore, the mounting base 1 housing the electromagnetic block A is attached to the bottom surface of the body 23 with assembly screws 84 as shown in FIG. 6(a), and the cover 80 is fixed to the top surface of the body 23 with assembly screws 85. be done. Here, the top surface of the electromagnet block A is insulated by the bottom of the body 23 made of an insulating material. It stands out.

FIG. 7 shows an electric circuit diagram in which a series circuit including a shorting coil 33, a bimetal 39, contacts 36, 75, etc. is inserted between terminal portions 70 and 73. Further, an auxiliary contact SW composed of an auxiliary identification contact 66 and an auxiliary contact spring 67,
A series circuit of the coil 5 of the electromagnet section 3 and the coil 5 of the electromagnet section 3 is connected to the auxiliary terminal 22. An external switch SW2 is connected to the auxiliary terminal 22. The feature of this breaker is that even if the handle 60 is turned on, the contacts 36.75 are not turned on and the main circuit is not energized unless the operator operates the external switch SW2. Then, if the external switch SW2 is turned off or the handle 60 is turned off 'Pj' and l5Wl is turned off, the auxiliary contact SW and the external switch SW2 are connected to the coil 5 of the electromagnet section 3. Because they are inserted in series, the electromagnet part 3
is cut off, contacts 36.75 are opened, and the main circuit is cut off.

Next, the operation of this breaker will be explained.

FIG. 5 shows a sectional view taken along line AA in FIG. 3, and FIG. 6 shows a cross-sectional view taken along line BB[rt?] in FIG. The figure shows. Figures 5 (,) and 6
Figure (a) shows the on state, Figure 5 (1+) and Figure 6 (
11) shows the off state when the handle 60 is on and the electromagnet part 3 is off, FIG. 5(c) and FIG. 6(c) show the off state, and FIG. 5(d) and FIG. (d) shows a trip state.

First, when the handle 60 is turned on as shown in FIG. 6(a) from the off state shown in FIG. 6(()), the handle 60
The protrusion 60c of is separated from the auxiliary contact spring 67 of the auxiliary contact SW, the auxiliary contact spring 67 returns, and the auxiliary contact SW is closed as shown in FIG. 5(a). Therefore, when the external switch SW2 shown in FIG. 7 is on, the coil 5 of the electromagnet part 3 is excited, and the movable core 7 is attracted to the fixed core 6 as shown in FIGS. 5 and 6 (a). be done. Movable iron core 7
When is attracted, the conversion shaft 11 connected to the movable iron core 7 and the U-shaped pin 16 rotates clockwise about the shaft 13. Move downward. When the connecting pin 18 moves downward, the link 45 connected to the connecting pin 18 rotates around the rotating shaft 50.
The half-hour hand rotates around the axis. Therefore, link 45
The interlocking plate 26 disposed below is moved downward against the return force of the opening spring 29. When the interlocking plate 26 moves downward, the movable contact 27 and the contact pressure spring 28 are located in the hole 26a of the interlocking plate 26 as shown in FIG. 5(a). 28 is moved downward, and the movable contact 36 of the movable contact 27 and the identification contact 75 are moved by the contact force of the contact pressure spring 28.
will come into contact with the main circuit and the main circuit will be energized.

Here, when only the electromagnet section 3 is turned off using the external switch SW2, the movable core 7 returns to the left in the figure due to the return force of the spring 10, as shown in (1) in FIGS. 5 and 6. do. This movement of the movable iron core 7 causes the conversion shaft 11 to rotate about the shaft 13 in the direction of the half-hour hand. This conversion axis 11
As the link pin 18 rotates in the direction of the half-hour hand, the connecting pin 18 is moved upward, causing the link 45 to rotate clockwise. Therefore, the interlocking plate 26 whose urging force by the link 45 has been released is moved upward by the restoring force of the opening spring 29, and the movable contact 27 is also moved upward, and the contacts '(6 and 75) are opened. -20= At this time, the biasing force of the spring 35 that biases the base of the movable contact 27 together with the return force of the opening spring 29 rotates the protrusion 37a as an axis in the direction of the half-hour hand to open the pole. It is something.

Next, when the handle 60 is turned off from the on position, the protrusion 60c of the handle 60 presses the auxiliary contact spring 67 of the auxiliary contact SW downward, as shown in FIGS. 5 and 6(c). The auxiliary contact spring 67 is connected to the auxiliary identification contact 66.
Further away, the auxiliary contact SW opens. Therefore, the opening of this auxiliary contact SW1 cuts off the current supply to the electromagnet 3, and the connecting pin 18 and the like operate in the same manner as in the above case to open the contact 36.75.

Next, the case of trip state will be explained. First, the case where the main circuit is short-circuited will be explained. In the case of a short-circuit, a large current flows, so that an electromagnetic force is generated in the short-circuit coil 33, causing a trip operation.

Here, in a normal state before a short circuit occurs, the sixth
As shown in the figure (,), the rotating shaft 50 that pivotally supports the link 45 and the latch plate 48 is located at the lower part of the elongated hole 44 of the frame 41. The latch plate 48 is engaged with the engagement piece 57 of the latch engagement plate 53.

Furthermore, the engaging portion 56 of the latch engaging plate 53 is as shown in FIG. 5(a).
As shown in FIG. 3, it engages with the head 34a of the drive pin 34. When a short circuit occurs, the electromagnetic force generated in the short circuit filter 33 attracts and drives the drive pin 34 downward. This drive pin 3
4 moves in the F direction, the engaging portion 56 is pressed against the pin 5.
5 as an axis, the latch engagement plate 53 rotates in the direction of the half hour hand. Then, the latch plate 48 disengaged from the engagement piece 57 of the latch engagement plate 53 enters the 717-state, and the link 45 is urged upward via the interlocking plate 26 by the return force of the opening spring 29. The rotation shaft 50 of the link 45 moves to the upper end of the elongated hole 44 of the frame 41.

Therefore, when the downward urging force of the interlocking plate 26 is released, the movable contact 27 also moves upward, and the contacts 36.75 are opened and separated. : Since the drive pin 34 is rapidly sucked downward, the lower end of the drive pin 34 is connected to the movable contact 2.
7 and apply a clockwise rotational force to the movable contact 27 to rotate the movable contact 27 at once, and the contact 3
6, 75 to lul pole. In addition, the display protrusion 26c can freely protrude from the display window 82 in accordance with the driving of the interlocking plate 26, and when the contact 36.75 is opened, the display protrusion 26c
c protrudes, and when contact 3 (i, 75 is closed, the display protrusion 26c does not protrude from the display window 82, and the contact 36,
The opening and closing of 75 are displayed. In addition, when a short circuit occurs, the short circuit coil 33 also attracts the drive pin 34 in the l direction by electromagnetic force, as in the case of a double series.
At this time, the lower end of the drive pin 37I hits the protrusion 271), and the movable contact 27 is rotated clockwise together with the opening spring 29 (7) to forcibly open the contact 36°75.

Also, when an overcurrent flows, the bimetal 39 bends,
The lever 40 attached to the tip of the bimetal 39 presses against the back surface 53c of the latch engagement plate 53, rotates the latch engagement plate 53 clockwise around the pin 55, and engages the engagement piece 57.
The engagement with the latch plate 48 is released. As a result of this release, the link 45 moves as in the previous case, the urging force on the interlocking plate 26 is released, and the contacts 36.75 are opened.

Next, after the tripping operation, the user turns off the external switch SW 2 after seeing that the handle 60 is in the on position and the display protrusion 26c is protruding, thereby turning off the electromagnet section 3 and returning the movable iron core 7. As a result, as shown in (1) of FIGS. 5 and 6, the connecting pin 18 is moved upward by the conversion shaft 11, and the link 45 is moved as shown. Then, as shown in FIGS. 5 and 6 (c), the handle 6 ()
to the OFF position to return it to the OFF state. Also, when the handle 60 is turned off, the pressing piece 68 of the handle 60 allows
The connecting portion between the link 45 and the latch plate 48 is pressed downward, and the latch plate 48 is rotated in a clockwise direction to close the latch plate 48.
The engagement recess 58 of the latch engagement plate 53 can be engaged with the engagement piece 57 of the latch engagement plate 53 to be reset. At this time, since the auxiliary contact SW1 is turned off by turning the handle 60 off, the movable iron core 7 of the electromagnet section 3 returns to its initial position. Therefore, the reset is done by operating the handle 60 and by operating the electromagnet part 3.
This can also be done by stopping the supply of the electric pressure and returning the movable iron core 7 to its original position.

I. Effects of the Invention] As described above, the present invention includes a movable contact that is pressed by operating a handle and is fixed at its tip, and a movable contact that contacts an opposing identification contact, and an appropriate contact pressure when both contacts are in contact with each other. It is equipped with a flat spring that bends, and a short-circuit sensor that drives a trip mechanism by electromagnetic force flowing through the short-circuit coil when a large current is detected at the time of a short-circuit current, and urges a movable contact in a direction in which both contacts open. In a breaker, a movable contact is fixed to the lower surface of the tip of a movable contact whose approximately central portion is pivotally supported, and is attached to the base of a leaf spring arranged above the movable contact and in the same direction as the movable contact. A hole is drilled, and a protrusion higher than the thickness of the leaf spring is provided on the upper surface of the base of the movable contact, which is attracted downward by the electromagnetic force of the short-circuited coil, and drives the trip mechanism at one end, and the lower end. a short-circuit sensor having a drive pin that contacts the protrusion is disposed above the base of the movable contact;
Since the lower end of the spring body is disposed between the lower surface of the short circuit sensor and the upper surface of the base of the movable contact and biases the movable contact in the direction of opening the movable contact, the lower end thereof is held on the protrusion. The mounting hole of the contact pressure spring is attached to the protrusion of the movable contact and the contact pressure spring is fixed to the movable contact to connect the contact pressure spring and the movable contact, and the lower end of the spring body is held by the protrusion. The protrusion also serves as a means for holding the spring body, and therefore the protrusion allows easy positioning of the leaf spring.
This improves workability and improves accuracy. Furthermore, by holding the spring body with the protrusion, there is no need to provide a separate holding means as in the conventional case. Furthermore,
In the event of a short circuit, the lower end of the drive pin, which is attracted and driven downward by the short circuit coil, is brought into contact with the protrusion to move the movable contactor to the MM of the contact point.
By applying a force in the force direction, the movable contactor is quickly rotated to forcibly open the contacts, thereby producing an effect. Therefore, by transmitting the short circuit sensor through the protrusion, the movable contact itself is not brought into contact with the short circuit sensor, so that the movable contact is not deformed and the reliability of forced opening is maintained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of an embodiment of the present invention, Fig. 2 is an exploded perspective view of the entire remote control breaker as above, Fig. 3 is a plan view of the above, Fig. 4 is a side view of the above, and Fig. 5 is a sectional view taken along the line A-A in FIG. 3, and FIG.
Figure (b) is a cross-sectional view when the electromagnet is in the off state.
The same figure (C) is a cross-sectional view of the off state, the same figure (d) is a cross-sectional view of the trip state, FIG. 6 is a BB cross-sectional view of the same figure 3, and the same figure (a) is the on state Figure 7 (1)) is a cross-sectional view when the electromagnet is in the OFF state, Figure (c) is a cross-sectional view in the OFF state, Figure (d) is a cross-sectional view in the tripped state, and Figure 7. 8(a)(+1) is an exploded perspective view and a perspective view of a main part of the same, and FIG. 9 is a configuration diagram of a main part of a conventional example. 27 is a movable contact, 27b is a protrusion, 28 is a contact spring, 2
8a is a single hole, 33 is a short circuit coil, 34 is a drive pin,
36 is a movable contact, and 75 is an identification contact. =27- Figure 5 (a) Figure 5 Ka 5 Ward 5 Figure 6 (G) Figure 6 (b) Figure 6 (C) Figure 6 (d) Figure 7 (a) Figure 8 Figure 9

Claims (1)

[Claims] (1) A movable contact that is pressed by operating a handle and is fixed to the tip of the movable contact and contacts an opposing identification contact;
A leaf spring applies an appropriate contact pressure when both contacts make contact, and when a large current is detected during a short circuit, the electromagnetic force that flows through the short circuit coil drives the trip mechanism to move the movable contact in the direction in which both contacts open. In a breaker equipped with a short-circuit sensor that energizes, a movable contact is fixed to the lower surface of the tip of a movable contact whose approximately central portion is pivotally supported, and a movable contact is fixed above the movable contact in the same direction as the movable contact. A mounting hole is drilled at the base of the leaf spring to be placed, and a protrusion higher than the thickness of the leaf spring is provided on the upper surface of the base of the movable contact, which is attracted downward by the electromagnetic force of the short circuit coil and trips at the upper end. A short-circuit sensor having a drive pin that drives the mechanism and whose lower end is brought into contact with the protrusion is disposed above the base of the movable contact, and is disposed between the lower surface of the short-circuit sensor and the upper surface of the base of the movable contact, and is movable. A breaker characterized in that the lower end of a spring body that biases the contact in the direction of opening the contact is held in the projection.