JP6840632B2 - Circuit breaker - Google Patents

Description

An embodiment of the present invention relates to a circuit breaker, a so-called circuit protector, that protects a circuit from a current larger than the rated current.

Recently, there is a demand for a compact, lightweight, large-capacity electromagnetic circuit breaker. The circuit breaker has a latch part that latches the switch part having a movable contact and a fixed contact in the ON state, and when a current exceeding the rated current flows, the switch part is released by releasing the latch part by an electromagnetic force. The section is turned off to protect the circuit from overcurrent (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Japanese Patent No. 4122917 Japanese Patent No. 5776327 Japanese Patent No. 5595827

The latch portion has a plurality of link mechanisms, and the accuracy of the parts constituting these link mechanisms and the accuracy of assembling the parts affect the performance of the circuit breaker. Therefore, in the manufacturing process, it is necessary to adjust the positional relationship of the parts in consideration of the accuracy of the parts and the assembly accuracy. Therefore, the manufacturing is complicated and the manufacturing cost is high.

An embodiment of the present invention provides a circuit breaker that does not require adjustment of the positional relationship of parts in a manufacturing process, is easy to manufacture, and can reduce the manufacturing cost.

The circuit breaker of the present embodiment includes a latch portion that latches a switch portion having a movable contact piece in an on state or an off state, and a latch release portion that releases a latch of the latch portion that latches the switch portion in an on state. The latch release portion has a coil, a frame provided on the coil, and a first end portion and a second end portion, and the frame has the first end portion and the second end portion. An intermediate portion between the two is rotatably provided, and the first end portion is provided with an armature urged in a direction away from the coil, and the latch portion is provided on the operator and the operator. When the first link having an interlocking portion and the first link and the movable contact piece are interlocked and the switch portion is set to the on state in conjunction with the operation of the armature, it hits the frame. A second link having a first protrusion to be contacted and a second link rotatably provided on the second link, the engaging portion of the first link engages when the first protrusion abuts on the frame. When the combined shaft portion and the first end portion of the armature are attracted to the coil, the second end portion of the armature is brought into contact with each other to engage the shaft portion with the engaging portion. A release member having a second protrusion to be released is provided.

The side view which shows the appearance of the circuit breaker which concerns on this embodiment. The side view which shows by removing a part of FIG. The perspective view of FIG. It is shown by removing a part of FIG. 2, and is the side view which shows the latch release state. FIG. 5 is a cross-sectional view showing a part of FIG. 4 cut out. A perspective view showing a part of FIG. 4 in an exploded manner. The perspective view which shows the relationship between an actuator and an armature. The perspective view which shows the relationship between an armature and a handle link and a latch link. The perspective view which shows the relationship between the latch link and the holding link. The perspective view which shows the relationship between the latch release member and an armature. The perspective view which shows the relationship between the holding link and the movable contact piece. The side view which shows the latch state of the circuit breaker which concerns on this embodiment. The cross-sectional view which shows the latch state of the circuit breaker which concerns on this embodiment. The figure which shows the operation characteristic of the circuit breaker which concerns on this embodiment. The figure which shows the operation characteristic of the circuit breaker as a comparative example.

Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same parts are designated by the same reference numerals.
[Constitution]
FIG. 1 shows a circuit breaker 10 according to this embodiment. The circuit breaker 10 has a cover 11 that covers the first base and the second base as a housing described later. The cover 11 has a flange-shaped plate 11a, and claws 11b and 11c are provided on the side surfaces corresponding to both sides of the plate 11a. The claws 11b and 11c function as a retaining prevention unit when the circuit breaker 10 is attached to, for example, a switchboard or the like (not shown). An operator 12 rotatably held by the cover 11 is provided at the center of the plate 11a.

2 and 3 show a state in which the cover 11 shown in FIG. 1 is removed. The first base 15 and the second base 16 constitute a housing, and the first base 15 is removable with respect to the second base 16. The first base 15 is provided with a plurality of openings 15a, 15b, 15c into which a plurality of pins, which will be described later, are inserted.

A load terminal 13 and a power supply terminal 14 are provided on the bottoms of the first base 15 and the second base 16.

4 and 5 show a state in which the base 15 shown in FIGS. 2 and 3 is removed. A switch portion 17, a latch portion 18, and a latch release portion 19 are provided in the first base 15 and the second base 16.

The switch unit 17 includes a contact (fixed contact) 20 provided at the power supply terminal 14, a contact (movable contact) 22 provided at one end of the movable contact piece 21 and the like.

The latch portion 18 is configured by a link mechanism that latches (holds) the switch portion 17 in an on state or an off state. That is, the latch portion 18 includes an armature 30, a handle link 31, a latch link (first link) 32, a holding link (second link) 33, a latch release member (trip pin) 34, and the like.

The latch release unit 19 has an actuator 50. The actuator 50 includes a frame 51, a coil 52, and the like.

As shown in FIG. 5, the central portion of the armature 30 is rotatably held by a pin 35 provided on the frame 51 of the latch release portion 19, although details will be described later.

The central portion of the handle link 31 is rotatably held by a pin 36 provided on the frame 51. A pin 37 is provided at one end of the handle link 31, and is connected to the operator 12 via the pin 37.

One end of the latch link 32 is connected to the other end of the handle link 31 by a pin 38.

One end of the holding link 33 is connected to the other end of the latch link 32 by a pin 39. The other end of the holding link 33 is connected to the central portion of the movable contact piece 21 by a pin 40.

The latch release member 34 is rotatably provided at a substantially central portion of the holding link 33.

The other end of the movable contact piece 21 is rotatably provided on a pin 41 provided on the frame 51.

In the latch release unit 19, the actuator 50 includes a frame 51, a coil 52, a tube 53 including a plunger 54, and the like.

The frame 51 has a function as a yoke for forming a magnetic circuit. The frame 51 has a first portion 51a parallel to the bottom of the second base 16, a second portion 51b orthogonal to the first portion 51a, and a third portion 51b orthogonal to the second portion 51b and parallel to the side surface of the second base 16. It has a portion 51c. One end of the pins 35, 36, 41 is fixed to the third portion 51c, and the other end of the pins 35, 36, 41 is inserted into the openings 15a, 15b, 15c of the first base 15 shown in FIG. 3, respectively. ing.

The tube 53 is arranged in the central portion of the first portion 51a in parallel with the second portion 51b.

The coil 52 is arranged around the tube 53. One end of the coil 52 is connected to the load terminal 13, and the other end is connected to the movable contact piece 21.

The tube 53 has a plunger 54 that can move inside and a coil spring 56 that urges the plunger 54 toward the bottom of the tube 53, and the inside of the tube 53 is filled with, for example, oil 55. The oil 55 functions as a damper that delays the operating speed of the plunger 54.

The armature 30 rotatably held by the frame 51 is rotated in the direction of arrow A shown in FIG. 4 by exciting the coil 52, and one end of the armature 30 is brought into contact with the upper portion of the tube 53. ..

In the first portion 51a of the frame 51, the portion to which the tube 53 is mounted is bent downward along the side surface of the tube 53, and the area facing the plunger 54 is expanded. Further, the upper end of the second portion 51b of the frame 51 is bent in the pin 35 direction, and the area facing the armature 30 is expanded.

By expanding the facing area between the frame 51 and the plunger 54 and the frame 51 and the armature 30 in this way, the magnetic flux generated by the coil 52 can be easily passed through the plunger 54, the frame 51, and the armature 30, and the magnetic circuit. Can be improved.

The configuration of the latch release unit 19 will be further described with reference to FIGS. 6 to 11.

As shown in FIG. 6, the central portion of the armature 30 is rotatably held by a pin 35 provided in the third portion 51c of the frame 51, and one end portion thereof can come into contact with the actuator 50. The other end of the armature 30 has two portions, one serving as a driving unit 30a for releasing the latch of the latching 18 and the other serving as, for example, a balancer 30b. An inertial disc (weight) (not shown) is attached to the balancer 30b. As a result, when the motor is started, for example, when an inrush current several times to several tens of times the current during normal operation flows through the coil 52 in a few msec or less, the armature 30 is attracted and the motor is started. It prevents it from being disturbed.

As shown in FIG. 7, the armature 30 is urged in the direction of arrow B in the drawing by the spring 42 mounted on the pin 35 while being held by the pin 35, and as shown in FIGS. 4 and 5, the armature 30 is second. The rotation position is defined by abutting on the inner surface of the base 16. Specifically, one end of the armature 30 is held at a position rotated by an angle θ from the horizontal position as shown in FIG. 4 in a state where the actuator 50 is not driven. The angle θ is, for example, approximately 11 ° to 12 °. The rotation position of the armature 30 may be defined, for example, by bringing a part of the balancer 30b into contact with the second portion 51b of the frame 51.

At this time, the drive unit 30a of the armature 30 is arranged substantially parallel to the second portion 51b of the frame 51. As will be described later, when the actuator 50 is driven, the drive unit 30a collides with the latch release member 34 by rotating the armature 30 in the direction of the arrow A in the drawing, and drives the latch unit 18.

As shown in FIGS. 6 and 8, the central portion of the handle link 31 is held by the pin 36 provided in the third portion 51c of the frame 51 by the spring 43 mounted on the pin 36, and the arrow A in the drawing shows. Be urged in the direction. The other end of the handle link 31 has a groove 31a, and one end of the latch link 32 is connected to the handle link 31 by a pin 38 in a state of being inserted into the groove 31a.

A stepped engaging portion 32a is provided at the other end of the latch link 32, which faces the second portion 51b of the frame 51. The engaging portion 32a is capable of engaging with a part of the latch releasing member 34 in the latch state in which the latch portion 18 will be described later.

As shown in FIGS. 6 and 9, the holding link 33 is configured to be bent so as to sandwich both side surfaces of the latch link 32, for example. One end of the holding link 33 is connected to the other end of the latch link 32 by a pin 39.

For example, a pair of first protrusions 33a are provided in the intermediate portion of the holding link 33, which faces the second portion 51b of the frame 51. The first protrusion 33a is capable of contacting the second portion 51b of the frame 51 in the latch state in which the latch portion 18 will be described later.

As shown in FIGS. 6 and 10, a latch release member 34 is rotatably provided in the intermediate portion of the holding link 33. The latch release member 34 includes a columnar shaft portion 34a, a flange 34c, and a second protrusion 34d.

The shaft portion 34a is rotatably provided on the holding link 33, and the portion of the shaft portion 34a located inside the holding link 33 has a recess 34b. The other end of the latch link 32 can enter the recess 34b, and the engaging portion 32a of the latch link 32 is engaged with the shaft portion 34a of the latch releasing member 34 in the latch state described later.

The flange 34c is provided at one end of the shaft portion 34a, and the second protrusion 34d is a part of the flange 34c and is provided so as to project in the direction opposite to the shaft portion 34a.

As shown in FIG. 10, the latch release member 34 is rotatably inserted into the holding link 33 with the spring 44 mounted on the shaft portion 34a. One end of the spring 44 is in contact with the pin 39, and the other end is in contact with the lower portion of the flange 34c of the latch release member 34. Therefore, the latch release member 34 is urged in the direction of arrow B in the drawing, and a part of the flange 34c comes into contact with the third protrusion 33b provided on the holding link 33, whereby the rotation position is defined. The second protrusion 34d of the latch release member 34 is arranged at a position where the drive portion 30a of the armature 30 can come into contact with the second protrusion 34d.

In the latch state described later, when the actuator 50 is driven and the armature 30 is rotated in the direction of the arrow A in the drawing, the drive portion 30a of the armature 30 comes into contact with the second protrusion 34d, and the latch release member 34 is attached with the spring 44. It is rotated in the direction of arrow A in the figure against the force. As a result, the engagement state between the latch release member 34 and the latch link 32 is released.

As shown in FIGS. 6 and 11, the central portion of the movable contact piece 21 is rotatably connected to the holding link 33 by a pin 40 in a state of being inserted inside the holding link 33. A spring 45 is attached to the pin 40, and the holding link 33 is urged by the spring 45 in the direction of the arrow A shown in FIG. The spring 45 holds the posture of the holding link 33.

Further, at the other end of the movable contact piece 21, a long hole 21a is provided in a direction intersecting the longitudinal direction of the movable contact piece 21, and a pin 41 provided in the long hole 21a in the third portion 51c of the frame 51. Is inserted. Therefore, the movable contact piece 21 is movable in a direction intersecting the longitudinal direction of the pin 41. A spring 46 is attached to the pin 41, and the movable contact piece 21 is urged by the spring 46 in the direction of the arrow A shown in FIG.

When the actuator 50 is driven, the spring 46 makes the movable contact piece 21 rotatable in the direction of arrow A in the drawing at high speed with the pin 41 as the center of rotation. Further, the spring 46 rotates the movable contact piece 21 around the pin 40 in the latch state, and supplies the contact pressure when the contact 22 contacts the contact 20.

Further, the spring 46 supplies the engaging force between the shaft portion 34a of the latch releasing member 34 and the engaging portion 32a of the latch link 32. The engaging force between the shaft portion 34a of the latch releasing member 34 and the engaging portion 32a of the latch link 32 is mainly determined by the difference between the acting forces of the spring 46 and the spring 43. The force relationship between the spring 46 and the spring 43 is set to spring 46> spring 43. If this relationship is reversed, the latch will not hold.
[Action]
In the above configuration, the operation of the circuit breaker 10 will be described.

4 and 5 show a case where the circuit breaker 10 is in the off state and the latch portion 18 is in the latch release state. When the circuit breaker 10 is off, the movable contact piece 21 constituting the switch portion 17 is rotated in the direction of arrow A in the drawing, the contact 22 of the movable contact piece 21 is separated from the contact 20 of the power supply terminal 14, and the actuator 50 Is not driven. At this time, the holding link 33, the latch link 32, and the handle link 31 which are sequentially connected to the movable contact piece 21 are interlocked, and the handle link 31 is rotated in the direction of the arrow A in the drawing with the pin 36 as a fulcrum. Therefore, the operator 12 is rotated in the direction of arrow B in the drawing.

When the circuit breaker 10 is off, the engaging portion 32a of the latch link 32 is separated from the shaft portion 34a of the latch releasing member 34, and the first protrusion 33a of the holding link 33 is separated from the second portion 51b of the frame 51. Has been done.

Further, the movable contact piece 21 is rotated by the spring 46 in the direction of arrow A in the drawing about the pin 41, and the pin 41 is in contact with the lower end portion of the elongated hole 21a.

On the other hand, FIGS. 12 and 13 show a case where the circuit breaker 10 is in the ON state and the latch portion 18 is in the latch state.

In the state shown in FIGS. 4 and 5, when the operator 12 is rotated in the direction of arrow A in the drawing, the handle link 31 is rotated in the direction of arrow B in the drawing with the pin 36 as a fulcrum. Therefore, the latch link 32, the holding link 33, and the movable contact piece 21 which are sequentially connected to the handle link 31 are interlocked with the handle link 31 as shown in FIGS. 12 and 13, and the contact 22 of the movable contact piece 21 is connected. The state of contact with the contact 20 of the power supply terminal 14, that is, the circuit breaker 10 is on, and the latch portion 18 is in the latch state.

Specifically, when the operator 12 is rotated in the direction of the arrow A in the drawing, the engaging portion 32a of the latch link 32 first engages with the shaft portion 34a of the latch releasing member 34, as shown in FIG. Will be done. After that, as the operator 12 rotates, the contact 22 of the movable contact piece 21 comes into contact with the contact 20 of the power supply terminal 14.

Further, when the operator 12 is rotated in the direction of the arrow A in the drawing, the holding link 33 is rotated in the direction of the arrow A in the drawing, so that the other end of the movable contact piece 21 is as shown in FIG. As shown in FIG. 13, the pin 41 is moved from the position where the pin 41 abuts on the lower end of the elongated hole 21a to a position substantially in the middle of the elongated hole 21a.

After that, as shown in FIG. 13, the first protrusion 33a of the holding link 33 is brought into contact with the second portion 51b of the frame 51.

As shown in the D portion of FIG. 13, the first protrusion 33a of the holding link 33 abuts on the second portion 51b of the frame 51, so that the pin 39 connecting the holding link 33 and the latch link 32 is directed in the direction of arrow C in the drawing. When pressed, the pin 39 moves slightly from the straight line L connecting the pin 38 and the pin 40 to the side opposite to the first protrusion 33a. As a result, the engaging portion 32a of the latch link 32 is securely engaged with the shaft portion 34a of the latch releasing member 34.

By defining the positions of the holding link 33, the latch link 32, the movable contact piece 21, and the latch releasing member 34 in this way, the latch state of the latch portion 18 is maintained.

When the latch portion 18 is held in the latched state, the movable contact piece 21 is urged by the spring 46 in the direction of arrow B in the drawing centering on the pin 40. Further, the spring 46 supplies the contact pressure between the contact 22 and the contact 20, and also imparts a holding force for holding the latch state of the latch portion 18.
[Latch release operation]
When the circuit breaker 10 shown in FIGS. 12 and 13 is in the latched state, it is rated between the contact 20 of the power supply terminal 14, the contact 22 of the switch portion 17, the movable contact piece 21, the coil 52 of the actuator 50, and the load terminal 13. Current is flowing.
(Operation at overload current)
In the latch state, when an overload current exceeding the rated current, for example, flows through the coil 52, the plunger 54 moves to the upper part of the tube 53 due to the electromagnetic force generated in the coil 52. Therefore, one end of the armature 30 is attracted by an electromagnetic force and is rotated in the direction of arrow A in the drawing. Along with this, the drive unit 30a of the armature 30 comes into contact with the second protrusion 34d of the latch release member 34, and the latch release member 34 is rotated in the direction of the arrow A in the drawing. Therefore, the engagement state between the shaft portion 34a of the latch release member 34 and the engaging portion 32a of the latch link 32 is released, and the latch link 32 and the holding link 33 rotate about the pin 39. That is, the latch link 32 rotates in the direction of the arrow A in the figure, and the holding link 33 rotates in the direction of the arrow B in the figure.

When the holding link 33 rotates in the B direction, the movable contact piece 21 connected to the holding link 33 is raised, and the other end of the movable contact piece 21 moves to a position where the pin 41 contacts the lower end of the elongated hole 21a. To do. At the same time, the movable contact piece 21 is rotated in the direction of arrow A around the pin 41 by the urging force of the spring 46, and the contact 22 is separated from the contact 20 and the switch portion 17 is turned off, so that the circuit breaker 10 is in a cutoff state.

As the pressing force on the movable contact piece 21 by the holding link 33 is released, the latch link 32, the handle link 31, and the operator 12 connected to the holding link 33 are interlocked, as shown in FIGS. 4 and 5. In addition, the operator 12 is rotated in the direction of arrow B in the drawing to be in the latch release state.
(Operation at short circuit current)
In the latched state shown in FIGS. 12 and 13, when a large current (short-circuit current, for example, a current of 400% or more in the rated current ratio) that greatly exceeds the rated current flows through the coil 52, the electromagnetic force generated by the coil 52 is generated. Before the plunger 54 is moved to the upper part of the tube 53 by the force, one end of the armature 30 is attracted by the electromagnetic force and rotated in the direction of the arrow A in the drawing. Along with this, the drive unit 30a of the armature 30 collides with the second protrusion 34d of the latch release member 34, and the latch release member 34 is rotated in the direction of the arrow A in the drawing. Therefore, the engagement state between the shaft portion 34a of the latch release member 34 and the engaging portion 32a of the latch link 32 is released, and the pressing force on the movable contact piece 21 by the holding link 33 is released. Therefore, the movable contact piece 21 is rotated in the direction of arrow A in the drawing by the urging force of the spring 46, the contact 22 is separated from the contact 20, and the switch portion 17 is turned off, so that the circuit breaker 10 is in a cutoff state. .. The operation of the latch portion 18 is the same as the operation at the time of overload current.
(Effect of embodiment)
According to the present embodiment, the latch portion 18 includes a latch link 32, a holding link 33, and a movable contact piece 21 which are sequentially connected to the operator 12 and the handle link 31, and frame the first protrusion 33a of the holding link 33. By abutting the second portion 51b of 51, the positions of the holding link 33, the latch link 32, the movable contact piece 21, and the latch releasing member 34 can be defined. Therefore, since the position of the latch release member 34 can be easily defined, it is possible to reduce the variation in the distance between the second protrusion 34d of the latch release member 34 and the drive unit 30a of the armature 30, and the relative parts of each component can be reduced. Position accuracy can be improved.

Further, by providing the holding link 33 with the first protrusion 33a and bringing the first protrusion 33a into contact with the second portion 51b of the frame 51, the position of the latch release member 34 can be defined, and the relative of each component can be defined. Since the position accuracy is improved, it is possible to obtain desired blocking characteristics without performing adjustment work in the assembly work. Therefore, it is possible to stabilize the quality, it is easy to manufacture, and it is possible to suppress an increase in manufacturing cost.

FIG. 14 shows the operating characteristics of the circuit breaker 10 according to the present embodiment, and shows the operating angle of the armature 30 and the electromagnetic force and load of the actuator 50 (the urging force of the spring 42 and the latch releasing force of the latch portion 18). Shows the relationship with.

Here, the urging force F1 of the spring 42 provided on the armature 30 is, for example, substantially 4 gf constant, and the urging force F1 of the spring 42 + the urging force of the spring 44 + the engaging portion 32a of the latch link 32 and the shaft of the latch releasing member 34. The sum of the frictional forces corresponding to the engaging force of the portion 34a is the latch releasing force F2 of the latch portion 18, and the latch releasing force F2 of the latch portion 18 is substantially constant at 14 gf. As described above, the armature 30 is rotated to a position of an angle θ, for example, approximately −11 ° to −12 ° in the non-operating state of the actuator 50.

In this state, for example, an overcurrent flows to drive the actuator 50, and the magnetic flux generated by the coil 52 moves the plunger 54 in the tube 53 to the upper end, forming a magnetic circuit including the plunger 54 and the frame 51. Next, a magnetic attraction force (electromagnetic force F3) is generated between the upper end of the tube 53 and the end of the armature 30 by the magnetic flux generated by the coil 52. When the opening angle θ of the armature 30 is maximum, the armature 30 rotates in the direction of arrow A shown in FIG. 12 under the condition that the electromagnetic force F3 is larger than the urging force of the spring 42 (the urging force of the spring 42 <electromagnetic force F3). Be moved. Then, after the electromagnetic force F3 of the coil 52 exceeds the latch release force F2, the drive unit 30a of the armature 30 comes into contact with the second projection 34d of the latch release member 34.

In this way, in a state where the electromagnetic force F3 of the coil 52 exceeds the latch release force F2, the drive unit 30a of the armature 30 comes into contact with the second protrusion 34d of the latch release member 34, so that the drive unit 30a of the armature 30 is pressed. With sufficient force, it can collide with the second protrusion 34d of the latch release member 34, and the latch state can be reliably released.

That is, when the first protrusion 33a of the holding link 33 is in contact with the second portion 51b of the frame 51, the contact start position between the second protrusion 34d of the latch release member 34 and the drive portion 30a of the armature 30 is the armature. The operating angles θ of 30 are distributed in a narrow range of 1.4 °, for example, -4.4 ° to -3 °.

The amount of engagement required for the shaft portion 34a of the latch release member 34 and the engagement portion 32a of the latch link 32 to stably hold and release the latch state in consideration of vibration and impact is, for example, about 0.16 mm (0. 25 to 0.07 mm). When converted to the operating angle of the armature 30, the maximum is 3 °, and in order to release the latch state, the operating angle until one end of the armature 30 contacts the upper end of the tube 53 is 3 ° or more. It takes.

Therefore, there are two conditions necessary for releasing the latch state. First, when the second protrusion 34d of the latch release member 34 and the drive unit 30a of the armature 30 come into contact with each other, the electromagnetic force F3 is applied. The latch release force F2 has been exceeded. Second, the operating angle from when the drive portion 30a of the armature 30 contacts the second protrusion 34d of the latch release member 34 until the end portion of the armature 30 contacts the upper end portion of the tube 53 is 3 ° or more. Is.

When the first protrusion 33a of the holding link 33 is in contact with the second portion 51b of the frame 51, the range of the contact start position between the second protrusion 34d of the latch release member 34 and the drive portion 30a of the armature 30 is the armature. Since the operating angle can be suppressed to a narrow range of 1.4 °, the above two conditions can be easily satisfied, and the latch state of the latch portion 18 can be released reliably and quickly.

On the other hand, FIG. 15 shows the operating characteristics of the circuit breaker as a comparative example. This comparative example is a case where the holding link 33 is not provided with the first protrusion 33a.

When the holding link 33 is not provided with the first protrusion 33a, the latch portion 18 can hold the latched state by abutting the pin 38 on the side wall of the third portion 51c of the frame 51, but the latch portion When 18 is in the latched state, the position of the latch releasing member 34 varies. That is, since the rotation position of the latch link 32 and the rotation position of the holding link 33 vary, the position of the latch release member 34 provided on the holding link 33 varies.

Therefore, as shown in FIG. 15, the contact start position between the second protrusion 34d of the latch release member 34 and the drive unit 30a of the armature 30 has an operating angle θ of the armature 30 of, for example, −5.4 ° to −2. It is distributed in the range of 5 °. That is, in the case of the comparative example, the range of the contact start position between the second protrusion 34d of the latch release member 34 and the drive unit 30a of the armature 30 becomes wider than that of the present embodiment due to the variation in the position of the latch release member 34. ..

Moreover, when the operating angle θ of the armature 30 is, for example, −5.4 °, and the drive unit 30a of the armature 30 comes into contact with the second protrusion 34d of the latch release member 34, the electromagnetic force F3 of the coil 52 is generated from the latch release force F2. small. Therefore, the switch unit 17 cannot be turned off.

Further, when the operating angle θ of the armature 30 is, for example, −2.5 °, the drive unit 30a of the armature 30 contacts the second protrusion 34d of the latch release member 34, and the armature 50 contacts the upper end of the tube 53 at an angle of 0. In the case of 3 °, the operating angle until the end of the armature 30 and the upper end of the tube 53 come into contact is less than 3 °, and the shaft portion 34a of the latch release member 34 and the engaging portion 32a of the latch link 32 are engaged with each other. The end of the armature 30 and the upper end of the tube 53 come into contact with each other before releasing. Therefore, the switch unit 17 cannot be turned off in the same manner as described above. Therefore, it is difficult to obtain sufficient performance as a circuit breaker.

As described above, the variation in the position of the latch release member 34 is the variation in the start of contact between the drive unit 30a of the armature 30 and the second protrusion 34d of the latch release member 34. Therefore, in order to release the latch state of the latch portion 18 reliably and quickly, it is important to suppress the variation in the position of the latch release member 34 as in the present embodiment.

The present embodiment is not limited to the above configuration. For example, when the operator 12 and the latch link 32 can be directly connected and the latch link 32 can be rotated by the operator 12, the handle The link 31 can be omitted.

In addition, the present invention is not limited to each of the above embodiments as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by appropriately combining the plurality of components disclosed in each of the above embodiments. For example, some components may be removed from all the components shown in the embodiments. In addition, components across different embodiments may be combined as appropriate.

10 ... Circuit breaker, 12 ... Operator, 17 ... Switch part, 18 ... Latch part, 19 ... Latch release part, 21 ... Movable contact piece, 30 ... Armature, 30a ... Drive part, 31 ... Handle link, 32 ... Latch Link (first link), 32a ... engaging part, 33 ... holding link (second link), 33a ... first protrusion, 34 ... latch release member (trip pin), 34a ... shaft part, 34d ... second protrusion, 42, 44, 46 ... springs, 50 ... actuators, 51 ... frames.

Claims (2)

A latch part that latches a switch part with a movable contact piece into an on state or an off state,
A latch release unit that releases the latch of the latch unit that has latched the switch unit in the ON state, and a latch release unit.
Equipped with
The latch release part is
With the coil
The frame provided on the coil and
It has a first end portion and a second end portion, and an intermediate portion between the first end portion and the second end portion is rotatably provided on the frame, and the first end portion is separated from the coil. Armatures urged in the direction of
Equipped with
The latch portion is
With the operator
A first link interlocked with the operator and having an engaging portion,
A second link having a first protrusion that is connected to the first link and the movable contact piece and has a first protrusion that comes into contact with the frame when the switch unit is set to the ON state in conjunction with the operation of the operator.
A shaft portion rotatably provided on the second link and with which the engaging portion of the first link is engaged when the first protrusion is brought into contact with the frame, and the first armature. When the end portion is sucked into the coil, the second end portion of the armature is brought into contact with the release member having a second protrusion that disengages the shaft portion from the engaging portion.
A circuit breaker comprising. The first pin that links the first link to the operator,
A second pin connecting the first link and the second link, a third pin connecting the second link and the movable contact piece, and the like.
Equipped with
A claim characterized in that, in a state where the first protrusion is in contact with the frame, the second pin is located on the opposite side of the straight line connecting the first pin and the third pin to the first protrusion. Item 1. The circuit breaker according to item 1.

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