JP2555415B2 - Remote control breaker - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a remote control breaker having an electromagnet portion that can be remotely controlled.

[Prior Art] Conventional remote control breakers of this type are disclosed in
-13211, JP41-13700, JP41-21
There are 252, Japanese Patent Publication No. 43-18805, Japanese Patent Publication No. 44482, and Japanese Patent Publication No. 4824. In these conventional examples, since the so-called latch portion is directly connected to the movable iron core, there is a problem that a miss lip is apt to occur due to the impact of the iron core during opening and closing. Further, since the latch portion moves by the stroke of the iron core, unnecessary force acts on the latch portion during opening / closing (latch tripping force due to swing of the iron core during opening / closing), and it is easy to miss-strip. Further, as the number of times of opening and closing increases, there is a problem that the wear of the latch portion becomes large and the miss lip is accelerated.

[Problems to be Solved by the Invention] The present invention has been provided in view of the above points,
An object of the present invention is to provide a remote control breaker that can obtain stable operation without a miss strip.

[Means for Solving the Problems] The present invention provides a switch that is turned on in association with an on operation of a handle, an external switch that is connected in series with the switch and is installed remotely, and the external switch and the switch. An electromagnet part that attracts and drives the movable iron core when both are in an on state, a conversion shaft that converts the lateral movement of the movable iron core to the vertical direction, and one end that is vertically movable in an arc-shaped long hole drilled in the frame. Is rotatably supported, the other end of the link is rotatably connected to the conversion shaft, and a connecting pin that urges the other end of the link upward when the electromagnet portion is turned off and the rotation of the link. Interlocking plate, a movable contactor that is inserted into the interlocking plate to open and close the contact, a protrusion that is integrally projected from the interlocking plate above the link located at the top of the interlocking plate, and a contact Opening that urges the interlocking plate in the opening direction A spring, a contact pressure spring for applying a contact pressure by urging the movable contact in the direction of closing the contact, a latch plate whose one end is pivotally supported together with one end of the link in the long hole of the frame, Latch engagement plate that has an engagement piece that latches with the engagement recess formed on the other end side, a spring that biases in the latch engagement releasing direction, and an abnormal current such as a short-circuit current or overcurrent is detected. Between the switch and the external switch, a sensor for driving the latch engagement plate that is driven by the sensor output to release the latch engagement between the engagement recess and the engagement piece for tripping operation. And a trip switch that is connected to and is driven by a latch plate whose latch engagement is released at the time of trip, and shuts off the power supply to the electromagnet portion.

[Operation] According to the present invention, the ends of the link and the latch plate are pivotally supported in the long hole of the frame, and the portion where the latch engagement is performed is provided on the side opposite to the connecting pin or the link receiving the movement from the electromagnet portion. To prevent the impact of the connecting pin or the link caused by the movement of the movable iron core from being transmitted to the engaging portion of the latch plate, and also to form the link between the top of the interlocking plate and the protrusion protruding integrally from the interlocking plate. It is arranged such that when the link moves upward, the movable contactor is inserted to forcibly move the interlocking plate upward.

(Example) Hereinafter, the Example of this invention is described with reference to drawings. 4A and 4B are exploded perspective views 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. There is. Further, the breaker has a three-pole structure for three phases.

First, the electromagnet block A will be described. An upper surface is opened, and a storage recess 2 is formed in a box-shaped mounting base 1 made of an insulating material, and an electromagnet portion 3 is stored and arranged in the storage recess 2. The electromagnet unit 3 includes a coil 5 wound around the outer periphery of the coil bobbin 4, a fixed iron core 6, a movable iron core 7 attracted to the fixed iron core 6 by the magnetic attraction of the coil 5, and the like. The fixed iron core 6 is formed in a substantially U shape, and the iron core portions 6a on both sides are inserted and arranged in the through hole 4a of the coil bobbin 4 such that the end surface of the iron core portion 6a slightly projects to the opening surface. The movable core 7 is fixed in a U-shaped fixing plate 9, and a spring 10 is provided between the movable core 7 and the coil bobbin 4.
Are arranged with interposition. The spring 10 is mounted and arranged on a protrusion 4 b protruding from the side surface of the coil bobbin 4.

The substantially U-shaped conversion shaft 11 converts the horizontal movement of the movable core 7 in the vertical direction, and the shaft 13 is inserted into a shaft hole 11a drilled in the axial direction. This axis 13
Both ends of the mounting base 1 are pivotally supported in the stepped portion 14 of the mounting base 1 so that the conversion shaft 11 is rotatable. The U-shaped pin 16 is inserted into the hole 12a of the central projection 12 formed in the center of the conversion shaft 11 and the hole 17a of the connecting piece 17 formed in the fixed plate 9,
The conversion shaft 11 is rotatably connected to the movable iron core 7 side by the U-shaped pin 16. Further, one end 18a of the connecting pin 18 shown in FIG. 4 (a) is inserted into the hole 15a of the side piece 15 formed on both sides of the conversion shaft 11.
Are inserted and connected respectively. As a result, the electromagnet portion 3 having the above-described structure is fixed in the storage recess 2 of the mounting base 1 as shown in FIG.
It is equipped with a damper 19 on the side of and stored.

Next, the contact opening / closing mechanism B will be described. On the upper surface of the body 23 made of an insulating material, three mechanism housing portions 25 are formed with a partition wall 24 interposed therebetween. As shown in FIG. 4A, three holes 26a are formed in the interlocking plate 26 that interlocks the three poles and is made of an insulating material, and the movable contacts 27 are inserted into the holes 26a. Further, the contact pressure spring 28 is installed in the hole 26a, and the movable contact 27
Is applied with an appropriate contact pressure. A recess 26c is formed on the lower surface of the interlocking plate 26, and an upper portion of an opening spring 29 that biases the interlocking plate 26 upward is mounted in the recess 26c, and the opening spring 29 is shown in FIG. As shown in a), it is accommodated in a recess 30 formed in the body 23. Interlocking plate 26 is body
It is inserted into the slit 31 of the partition wall 24 of 23, and is arranged so as to extend over each mechanism housing portion 25. A sensor for detecting an overcurrent or a short-circuit current is arranged in the mechanism housing section 25,
A short-circuit coil 33 is provided in a yoke 32 that is bent in a substantially U shape, and a drive pin 34 that can project from the upper and lower surfaces of the yoke 32 is mounted in the short-circuit coil 33. A contact 36 is provided on the lower surface of the tip of the movable contact 27.

An L-shaped mounting piece 37 is integrally formed from both lower sides of the short-circuit coil 33 and the yoke 32 constituting the magnetic circuit, and a hole 37b is drilled inside the mounting pieces 37. A tongue 27b is formed integrally at a substantially central portion of the movable contact 27, and a hole 27c is formed in the tongue 27b.
Is perforated. The movable contact 27 is positioned between the two mounting pieces 37, and the pin 86 is inserted into each of the holes 27c and 37b to support the movable contact 27. At this time, the movable contact 27 is
Since it is inserted in the hole 26a of the movable contact 27, the interlocking plate 26 biased upward by the opening spring 29 causes the movable contact 27 to move around the pin 86 by the interlocking plate 26 as shown in FIG. 2B. It receives a force in the direction of rotation. An arc horn 38 having a U-shaped tip is provided from one end of the yoke 32, and a bimetal 39 for detecting an overcurrent is provided at the other end. A screw 40 for current adjustment is screwed to the tip of the bimetal 39.

The frame 41 formed in a substantially U shape is shown in FIG. 1 (a).
As shown in the figure, the body 42 is
Fixed at 23. A circular arc-shaped long hole 44 is formed in both side plates 43 of the frame 41, and a U-shaped latch plate 48 and a leg portion 46 of a substantially H-shaped link 45 are located on the outer surface of the long hole 44. Then, the hole 46a of the leg portion 46 and the notch hole 4 opened at the tip side of the latch plate 48
The rotating shaft 50 is inserted through the elongated hole 44 of the frame 41 and the shaft 9a, and the link 45 and the latch plate 48 are rotatably connected to the frame 41 by the rotating shaft 50. On the other hand, a hole 48b is bored in the side piece 48a of the latch plate 48, and the hole 48b is inserted into the shaft 41b provided in the frame 41, so that the latch plate 48 is rotatable about the shaft 41b as a fulcrum. The frame 41 is pivotally supported.

A shaft support 53a formed at the center of the latch engagement plate 53
Are located between the projecting pieces 54 formed on the rear side of the frame 41, and the pin 55 is a hole 54a of the projecting piece 54 and a hole of the shaft support 53a of the latch engagement plate 53.
The latch engagement plate 53 is rotatably supported on a pin 55 inserted through the projecting piece 54 of the frame 41 as an axis. Three engaging portions 56 are provided on the front surface side of the latch engaging plate 53, and the engaging portions 56 are driven by a drive pin as shown in FIG. 2 (a).
34 is located below the head 34a and engages with the head 34a. Further, an engaging piece having an L-shaped tip from the lower surface of the latch engaging plate 53
A projection 57 is provided, and this engagement piece 57 engages with an engagement recess 58 formed in the central piece 48c of the latch plate 48, and the latch engagement plate 53
And the latch plate 48 are engaged.

A drive piece 89 is attached between the L-shaped attachment pieces 88 on both sides of the yoke 87 by pins 90, and the projection 87a of the yoke 87 and the frame 4
The protrusion 41c of 1 is attached by a pin (not shown) correspondingly. The spring 91 is interposed between the protrusion 41d below the protrusion 41c and the tongue 87b of the yoke 87, and the yoke 87
The positioning is regulated. The drive piece 89 attached to the yoke 87 is located on the back side of the latch engagement plate 53. Further, an adjusting plate 92 is integrally protruded upward from the yoke 87, and by adjusting the inclination of the adjusting plate 92 with an adjusting screw 93 having an eccentric shaft from above, the inclination of the entire yoke 87 can be reduced. The magnitude of the overcurrent for performing the trip operation can be adjusted by adjusting the inclination. Also the frame
A spring 94 is interposed between the protrusion 41e of 41 and the recess 53d of the latch engagement plate 53 to urge the latch engagement plate 53 in the direction of latching with the latch plate 48.

An arm piece 59 is formed on the front side of the frame 41.
A hole 59a is perforated at the tip of. The lower part of the handle 60 is located between the arm pieces 59, the handle shaft 61 is inserted into the hole 60a drilled in the handle 60 through the hole 59a of the arm piece 59, and the handle 60 is attached to the frame 41 with the handle shaft 61 as an axis. It is rotatably attached. A protrusion 60b is bored from the side surface of the handle 60, and one end of a reversing spring 62 for positioning the off position and the on position of the handle 60 beyond the dead center is locked to the protrusion 60b. Further, as shown in FIG. 1 (c), the handle 60 is formed with a pressing piece 68 for pressing the link 45 downward so as to set the link 45 to the initial position when the handle 60 is set to the off position. There is. The latch plate 48, the latch engagement plate 53 and the like constitute a trip mechanism, and the link 45, the conversion shaft 11, the interlocking plate 26 and the like constitute a link mechanism.

As shown in FIG. 4 (a), one end of the spring 95 is locked in the hole 96 of the window 41c of the frame 41, and the other end is a hole at the front portion of the latch plate 48 as shown in FIG. 1 (a). When the latch 95 is locked by the spring 48e and is disengaged by the spring 95, the latch plate 48 is urged in the clockwise direction so that the latch plate 48 can be quickly disengaged. The handle shaft 61 is inserted through the insertion hole 97a of the arc-shaped display piece 97, and is disposed on the side of the handle 60. As shown in FIG. 1 (c), the locking portion 97c of the display piece 97 and the link 45 are connected by the connecting pin 98, and the rotational position of the display piece 97 is changed by the operation of the link 45 and the connecting pin 98. Display on the surface of the display piece 97.
97b is displayed from the display window 80a of the cover 80.

Further, the limit switch 99 driven by the protrusion 60e of the handle 60 is arranged, and by operating the handle 60, the protrusion 60e drives the actuator 99a of the limit switch 99 to open and close the internal contacts. It has become. Further, a limit switch 100 for alarm notification is provided, and the projection 48d of the latch plate 48 drives the actuator 100a of the limit switch 100 to perform alarm notification in a trip state. Further, recesses 45a are formed on both sides of the link 45, and the recesses 45a are formed below the protrusions 26d that are provided so as to face the inner side of the upper portion of the interlocking plate 26. As shown in FIG. The link 45 is located on the top of the plate 26, and is arranged so that the link 45 is sandwiched by the protrusion 26d. Even when the interlocking plate 26 does not move upward due to the return force of the opening spring 28 due to contact welding or the like due to the protrusion 26d, the protrusions 26d of the interlocking plate 26
, The interlocking plate 26 is forcibly moved upward to open the contacts. Therefore, when off,
Since the interlocking plate 26 is pulled up by the return force of the movable iron core 7, contact welding is unlikely to occur. Also,
As shown in FIG. 4 (b), a limit switch 122 is provided, and this limit switch 122 is for holding the electromagnet part 3 by itself when the main contact is closed.

The electromagnet block A and the contact opening / closing mechanism B are connected as follows. That is, the partition wall 24 of the body 23 is provided with a penetrating portion that penetrates the upper and lower surfaces of the body 23, and the connecting pin 18 is inserted and arranged in the penetrating portion, and one end 18a of the connecting pin 18 is a hole of the conversion shaft 11. Insert into 15a, connecting pin
The other end 18b of 18 is inserted into the hole 47a of the arm piece 47 of the link 45, and the conversion shaft 11 and the link 45 are connected by the connecting pin 18.
With these connection configurations, the horizontal movement of the electromagnet section 3 is converted into the vertical movement by the connection pin 18, and the movement of the electromagnet section 3 is transmitted to the link 45. A terminal 70 on the load side is provided at one end of the mechanism housing section 25. This terminal part 70
Is composed of a terminal screw 70a, a fastening plate 70b, a terminal plate 70c, and the like. The tip of the terminal plate 70c and the lower end of the short-circuit coil 33 are fixed to each other, and a braid wire 71 is connected between the upper end of the short-circuit coil 33 and the upper end of the bimetal 39.
The lower part of 39 is connected to the base of the movable contactor 27 via the braided wire 72.

On the other side of the mechanism storage section 25, as shown in FIG.
A power supply terminal 73 is provided. Terminal 73 is a terminal screw
73a, a fastening plate 73b, a terminal plate 73c, and the like. An arc horn 74 is provided on the upper surface of the terminal plate 73c.
A fixed contact 75 facing the movable contact 36 is fixed on the end of the terminal plate 73c. The arc extinguishing device 76 has two side plates.
77 and a plurality of grid plates 78 juxtaposed between the two side plates 77
And an insulating plate 121 respectively located outside the side plate 77, and an insulating box 79 for covering these. Here, both arc horns 38 and 74 are insulated boxes 79 as shown in FIG. 2 (a).
Inside, it is arranged side by side with the grid plate 78.

The cover 80 that covers the upper surface of the body 23 is made of an insulating material, and a window hole 81 that allows the operation portion 60d of the handle 60 to protrude from the upper surface is formed in a substantially central portion of the cover 80. Further, on the side of the window hole 81, a display window 80a for displaying the display portion 97b of the display piece 97 is provided. The display unit 97b is adapted to display the ON state, the OFF state, the trip state, etc. of the main circuit. Notches 83 are formed at both ends of the cover 80, respectively.
The terminal portions 70, 73 are located in the cutout portion 83 as shown in FIG. The mounting base 1 in which the electromagnet block A is housed is mounted on the lower surface of the body 23 by the assembly screw 84 as shown in FIG. 1 (a), and the cover 80 is fixed on the upper surface of the body 23 by the assembly screw 85. To be done. Here, the upper surface of the electromagnet block A is a body made of an insulating material.
It is insulated by the bottom of 23, but the connecting pin 18 projects from the electromagnet block A toward the body 23 side through the through portion of the body 23.

FIG. 6 shows an electric circuit diagram in which a series circuit of the short-circuit coil 33, the bimetal 39, the contacts 36, 75, etc. is inserted between the terminal portions 70, 73. Also, the series circuit of between the auxiliary terminal 22 _1, 22 ₂ and the limit switch 99 in conjunction with the handle 60 and the limit switch 100 for alarm notification are connected, an alarm lamp 123 is connected to the auxiliary terminal 22 ₃ . Further, for the self-retention between the auxiliary terminal 22 _4, 22 ₅ limit switch 122
Lamp 124 but is connected, for off indication to the auxiliary terminal 22 ₅
But the auxiliary terminal 22 ₆ lamp 125 for on display are then respectively connected. Further, a switch SW ₃ for ON operation is connected to the auxiliary terminals 22 ₂ and 22 ₆ , and a switch SW ₄ for OFF operation is connected between the auxiliary terminals 22 ₂ and 22 ₄ . The features of this breaker are:
The main circuit contact 36,75 is not turned on unless the operator switch SW ₃ also handles 60 and turned on is not operated are those so as not to be energized. And switch SW ₃
Or the handle 60 is turned off to turn off the limit switch 122, the power supply to the coil 5 of the electromagnet unit 3 is cut off, the contacts 36 and 75 are opened, and the main circuit is cut off. You.

Next, the operation of the breaker will be described. 1 shows a sectional view taken along the line AA in FIG. 3, and FIG. 2 shows a line BB in FIG.
FIG. 1 (a) and 2 (a) show an off state, and FIGS. 1 (b) and 2 (b) show a handle.
Shows the off state when 60 is on and the electromagnet part 3 is off,
1 (c) and 2 (c) show an ON state, and FIGS. 1 (d) and 2 (d) show a trip state.

First, in the off state shown in (a) of FIGS. 1 and 2, the pressing piece 68 of the handle 60 presses the upper surface of the link 45 downward, and the projection 60e is the actuator of the limit switch 99. Press 99a to turn off the contact of limit switch 99. The power supply to the electromagnet unit 3 is cut off by turning off this contact. A rotary shaft 50 that pivotally supports the link 45 and the latch plate 48 is located below the elongated hole 44 of the frame 41. Further, the contacts 36 and 75 of the main circuit are open. Next, when the handle 60 is turned on as shown in FIG. 1C from the OFF state of FIG. 1A, the protrusion 60e of the handle 60 separates from the actuator 99a of the limit switch 99, and the limit switch 99 Turns on. Therefore, the sixth
As shown, power is applied to the lamp 124 to indicate that the handle 60 is on and the electromagnet portion 3 is off. Then, the switch SW shown in FIG.
_{The 3} is turned on to excite the coil 5 of the electromagnet section 3.
At the same time, the limit switch 122 is driven to switch the contacts and perform self-holding. Therefore, even release the switch SW _3, the coil 5 is continued to be energized. At this time, the lamp 125 lights up to indicate that it is in the on state. When the coil 5 is excited, the movable iron core 7 is attracted to the fixed iron core 6 as shown in (c) of FIGS. 1 and 2. Movable iron core 7
When the conversion shaft 11 is sucked, the conversion shaft 11 connected to the movable iron core 7 and the U-shaped pin 16 rotates clockwise about the shaft 13 as a fulcrum. Move down. When the connecting pin 18 moves downward, the link 45 connected to the connecting pin 18 rotates counterclockwise about the rotation shaft 50. Therefore, the interlocking plate 26 disposed below the link 45 is moved downward in cooperation with the link 45 against the return force of the opening spring 29. When the interlocking plate 26 moves downward, the movable contactor 27 is located in the hole 26a of the interlocking plate 26 as shown in FIG. The contact pressure brings the movable contact 36 of the movable contact 27 into contact with the fixed contact 75, and the main circuit is energized.

Here, when only the electromagnet unit 3 is turned off by operating the switch SW _4, as shown in (b) of FIGS. 1 and 2,
The movable iron core 7 is returned to the left side of the figure by the return force of the spring 10. By the movement of the movable core 7, the conversion shaft 11 is
Rotates counterclockwise around 13. The rotation of the conversion shaft 11 in the counterclockwise direction moves the connecting pin 18 upward, thereby rotating the link 45 clockwise. Accordingly, the interlocking plate 26 from which the urging force of the link 45 has been released is moved upward by the return force of the opening spring 29, so that the movable contact 27 also moves upward, and the contacts 36 and 75 are separated.

Next, when the handle 60 is turned off from the on position, as shown in (a) of FIG. 1 and FIG.
60e presses the actuator 99a of the limit switch 99 to turn off the contact. Therefore, when the limit switch 99 is turned off, the power supply to the electromagnet section 3 is completely shut off, and the electromagnet section 3 returns to the initial position as described above.

Further, at the time of off, as shown in FIGS. 2 (a) and 5 (a), the interlocking plate 26 biased upward by the opening spring 29 hits the lower surface of the yoke 32 and stops. Also the electromagnet part 3 returns and links via the connecting pin 18.
The link 45 further rotates, and thereafter, the link 45 contacts the protrusion 26d of the interlocking plate 26, and thereafter, the link 45 rotates about the vicinity of the contact point. The rotation of this link 45 causes the latch plate
By rotating 48 via the rotary shaft 50, the engagement recess 58 of the latch plate 48 more securely latches with the engagement piece 57 of the latch engagement plate 53, and therefore the reset margin It is possible to reliably obtain the above, eliminates the miss lip, and improves the operation reliability.

Here, a link 45 for driving the interlocking plate 26 is connected to one end of the latch plate 48 and the rotating shaft 50, and a connecting pin 18 having an end opposite to the latch plate 48 connected to the electromagnet unit 3 side. The latch portion between the latch plate 48 and the latch engagement plate 53 (the portion where the engagement piece 57 engages with the engagement recess 58) does not move at the time of the above-mentioned on / off operation. A stable operation without noise is obtained. That is, since the latch section does not come off when it is in the on / off state, the trip operation can be reliably performed when an abnormal state occurs. In addition, at the time of on / off, since all the members attached to the frame 41 are performed by pin connection,
Long life can be expected.

Next, the case of the trip state will be described. First, a case where the main circuit is short-circuited will be described. In the case of a short-circuit, since a large current flows, an electromagnetic force is generated in the short-circuit coil 33 and a trip operation is performed. Here, in the normal state before the short circuit occurs, the link 45 as shown in FIG.
The rotary shaft 50 that supports the latch plate 48 and the latch plate 48 is
Is located below the long hole 44. The latch plate 48 is engaged with the engagement piece 57 of the latch engagement plate 53. Also, the latch engagement plate
As shown in FIG. 2 (c), the engaging portion 56 of the 53 is a drive pin 34.
Engages with the head 34a of the.

As shown in (d) of FIGS. 1 and 2, when a short circuit occurs, the drive pin 34 is suction-driven downward by the electromagnetic force generated in the short circuit coil 33. The downward movement of the drive pin 34 pushes the engagement portion 56, and the latch engagement plate 53 rotates counterclockwise about the pin 55. Then, the latch engagement plate 53
The latch plate 48 is disengaged from the engagement piece 57 of the latch plate 48 and the engagement recess 58 of the latch plate 48, and the link 45 is connected to the opening spring 29.
As a result, the link 45 is moved upward to the upper end of the long hole 44 of the frame 41 by the link 45. At this time, the latch plate 48 rotates in the clockwise direction about the shaft 41b as a fulcrum by the restoring force of the spring 95, and the protrusion 48d causes the actuator 10 of the limit switch 100 to move.
By pressing 0a, the contact is switched, the alarm lamp 123 is turned on to display the trip state, and the power supply to the coil 5 of the electromagnet unit 3 is cut off. Accordingly, when the downward urging force of the interlocking plate 26 is released, the movable contact 27 also moves upward, and the contacts 36 and 75 are separated.

Also, at the time of trip, the notch hole 49a of the latch plate 48 connected to the link 45 is opened at the end, so that the opening operation of the link 45 is hastened. That is, when the periphery of the cutout hole 49a is closed, the link 45
Since the latch plate 48 and the latch plate 48 move in conjunction with each other until the opening is completed, the opening behavior of the interlocking plate 26 is also restricted, and the mechanical delay time becomes long. However, as mentioned above
Since the end of 49a on the link 45 side is open, the link 45 and the latch plate 48 work together halfway during a trip, but at some point the rotary shaft 50 protrudes from the notch hole 49a in the latch plate 48. Since the link 45 moves while being separated from the latch plate 48, the movement of the link 45 becomes faster, so that the mechanical delay time can be shortened and the contact opening characteristic is improved.

In addition, since the coil 5 is de-energized during the trip, the movable iron core 7 also tries to return. However, when the movable iron core 7 returns a little, the connecting pin 18 tries to move upward by the conversion shaft 11, An abutting piece 47a protruding from the tip of 45 abuts against the wall surface of the protruding portion 23a formed on the body 23 to prevent the connecting pin 18 from moving upward. That is, during normal on / off, the link 45 rotates about the rotary shaft 50, and therefore operates smoothly without contacting the wall surface of the protrusion 23a. Link 45 receives the restoring force, one side is the rotation axis
The link 45 is sandwiched between a part of the link 45 and the wall surface of the protruding portion 23a, and the link 45 is prevented from moving upwards. Therefore, the handle 60 of the link 45 which is prevented from moving upward is moved by the pressing piece 68 to move one end of the link 45 to the lower end of the long hole 44, and only the manual operation of the handle 60 can be reset. It is safe because it is possible to reliably prevent the remote reset by only the electromagnet section 3.

Also, when an overcurrent flows, the bimetal 39 bends,
The screw 40 attached to the tip of the bimetal 39 is shown in Figs.
As shown in (d) of the figure, the back surface of the drive piece 89 is pressed against and rotated, and the rotation of the drive piece 89 causes the latch engagement plate 53 to pivot.
The engagement piece 57 is disengaged from the latch plate 48 by rotating counterclockwise about 41b as a fulcrum. As a result of this release, the link 45 moves upward 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 trip operation, when the handle 60 is in the on position and the display of the display portion 97b of the display piece 97 is viewed, the handle 60 is turned off as shown in (a) of FIG. 1 and FIG. The link 45 or the like is positioned downward by the pressing piece 68 of the handle 60, and the latch plate 48 is rotated counterclockwise to form the engaging recess 58 of the latch plate 48 and the engaging piece 57 of the latch engaging plate 53. Can be engaged and reset. Therefore, by providing the pressing piece 68 on the handle 60, a manual reset can be easily performed.

The display piece 97 rotates independently of the handle 60 about the handle shaft 61, and the position of the display portion 97b is changed by the inclination of the link 45. That is, as shown in FIGS. 1 and 2, since the inclination of the link 45 differs depending on the on state, the off state, the trip state, etc., the link pin 98 rotates in accordance with the inclination and the display is made through the display window 80a. It is supposed to do.

[Advantages of the Invention] As described above, the present invention includes a switch that is turned on in association with a turning-on operation of a handle, an external switch that is connected in series with the switch and is installed remotely, and the external switch and the switch. An electromagnet part that attracts and drives the movable iron core when both are in an on state, a conversion shaft that converts the horizontal movement of the movable iron core to the vertical direction, and one end that is vertically movable in an arc-shaped long hole drilled in the frame. Is rotatably supported, the other end of the link is rotatably connected to the conversion shaft, and a connecting pin that urges the other end of the link upward when the electromagnet portion is turned off and the rotation of the link. Interlocking plate that interlocks with the interlocking plate, a movable contactor that is inserted into the interlocking plate to open and close the contact point, a protrusion that is integrally projected from the interlocking plate above the link located at the top of the interlocking plate, An opening bar that biases the interlocking plate in the opening direction. A contact pressure spring that applies contact pressure by urging the movable contact in the contact opening direction; a latch plate whose one end is pivotally supported together with one end of the link in the long hole of the frame; Detects an abnormal current such as a short circuit current or an overcurrent, a latch engagement plate having an engagement recess that is engaged with the engagement recess formed on the other end side, a spring that biases in the latch engagement release direction. Between the sensor, the drive piece driven by the sensor output to drive the latch engagement plate to release the latch engagement between the engagement recess and the engagement piece to perform the trip operation, and between the switch and the external switch. Since it is equipped with a trip switch that is inserted and connected and is driven by a latch plate whose latch engagement is released at the time of trip, the end of the link and the latch plate are framed together. It is supported by the long hole of The location where the engagement is performed is provided on the side opposite to the connecting pin or link that receives the movement from the electromagnet section so that the impact of the connecting pin or link due to the movement of the movable iron core cannot be easily transmitted to the engaging location of the latch plate. Therefore, since the latch portion does not move, a stable operation without a miss strip is obtained. In addition, a link is arranged between the top of the interlocking plate and a protrusion integrally provided so as to project from the interlocking plate, and the movable contact is inserted by the upward movement of the link to forcibly move up the interlocking plate. Therefore, there is an effect that welding of the contacts is less likely to occur.

In addition, when the link is rotated in the direction in which the other end moves upward when it is turned off, a stopper portion is provided to prevent the interlocking plate from moving upwards in conjunction with the link, and the stopper that abuts the protrusion of the interlocking plate. By rotating the link in the vicinity of the contact and rotating the latch plate in the reset margin direction by the rotation of the link, the reset margin of the latch engagement between the latch plate and the latch engagement plate is surely obtained, and the miss strip is eliminated. The operation reliability is improved, and in particular, a switch that is turned on in conjunction with the turning operation of the handle, an external switch that is connected in series with the switch, and is installed remotely, and the external switch and the switch are both Since it is equipped with an electromagnet device that attracts and drives the movable iron core when it is in the on state, the contacts cannot be closed as long as the handle is turned on and the electromagnet device is turned on. Be those, there is the advantage that it is possible to perform very safe operation.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line BB of FIG. 3 of the embodiment of the present invention, in which FIG. 1 (a) is a sectional view in an off state and FIG. The figure, the same figure (c) is a sectional view of an ON state, the same figure (d) is a sectional view of a trip state, FIG. 2 is the AA sectional view of FIG. 3 above, and the same figure (a)
Is a cross-sectional view in the off state, (b) is a cross-sectional view when the electromagnet portion is in the off-state, (c) is a cross-sectional view in the on-state,
FIG. 4D is a cross-sectional view of the trip state, FIG. 3 is a plan view of the same, FIG. 4A is an exploded perspective view of the same, and FIG.
Is an exploded perspective view of the above, FIG. 5 (a) is an exploded perspective view of the same, FIG. 5 (b) is an exploded perspective view of the same, and FIG. 6 is an electric circuit diagram of the same. 3 ... Electromagnet part, 7 ... Movable iron core, 11 ... Conversion axis, 18 ...
… Connecting pin, 26 …… Interlocking plate, 26d …… Projection part, 27 …… Moveable contactor, 28 …… Contact pressure spring, 29 …… Opening spring, 36 …… Movable contact, 41 …… Frame, 44… … Slot, 45… Link,
48 …… Latch plate, 50 …… Rotating shaft, 53 …… Latch engagement plate,
57 …… engaging piece, 58 …… engaging recess, 60 …… handle, 75…
… Fixed contact, 89 …… Drive piece, 93 …… Spring.

Claims (2)

(57) [Claims] 1. A switch that is turned on in association with a turning-on operation of a handle, an external switch that is connected in series with the switch and is installed remotely, and a movable iron core when the external switch and the switch are both on. An electromagnet portion for driving to drive, a conversion shaft for converting the lateral movement of the movable core into a vertical direction, and a link whose one end is rotatably supported by an arc-shaped long hole bored in the frame, The other end of the link and the conversion shaft are rotatably connected to each other, and a connecting pin that urges the other end of the link upward when the electromagnet section is turned off and an interlocking plate that interlocks with the rotation of the link are interlocked. A movable contactor that inserts into the plate to open and close the contacts, a protrusion that integrally projects from the interlocking plate above the link located at the top of the interlocking plate, and an interlocking plate in the contact opening direction Opening spring that urges and contact closing direction A contact pressure spring that urges the contactor to apply contact pressure, a latch plate whose one end is pivotally supported together with one end of the link in the elongated hole of the frame, and an engagement recess formed on the other end side of the latch plate. It is driven by the sensor output, the latch engagement plate that has an engagement piece that engages with the location, the spring that biases in the latch engagement release direction, the sensor that detects an abnormal current such as a short-circuit current or overcurrent, and the sensor output. It is inserted and connected between the drive piece that drives the latch engagement plate and releases the latch engagement between the engagement recess and the engagement piece to perform trip operation, and the switch and the external switch, and latches when the trip occurs. And a trip switch that is driven by the released latch plate to cut off power to the electromagnet section. 2. A stopper portion is provided to prevent upward movement of the interlocking plate that is interlocked with the link during the rotation of the link in the direction in which the other end moves up when it is off. The remote control breaker according to claim 1, wherein the link is rotated in the vicinity of the abutting contact point and the latch plate is rotated in the reset margin direction by the rotation of the link.