JP2001093388A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-size circuit breaker in a simple structure with a great rated breaking capacity. SOLUTION: An operation lever 33 and a control lever 34, joined to each other via a pull spring 37, are provided in a coaxially rotatable manner. If the operation lever 33 rotated anticlockwise after colliding with a kick pin 18 provided on a cross bar 4 for operating a movable contactor is rotated clockwise after colliding with the cross bar, the control lever 34 is continuously rotated anticlockwise with its control side receiving a control pin 19 provided on the cross bar 4, which is rebounded by colliding with a contactor stopper 17, to prevent the rebounding rotation of the cross bar 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing re-contact due to rebound in opening operation of a movable contact of a circuit breaker.

[0002]

2. Description of the Related Art A conventional circuit breaker is shown in FIGS. In FIG. 14, the circuit breaker in the ON state includes a pair of fixed contacts 1, a movable contact 2 that moves in the left-right direction and contacts and separates from the pair of fixed contacts 1, and a movable contact 2 , A contact lever 3 held by a rotatable cross bar 4,
A connecting shaft 6 for connecting the contact holder 3 and the contact lever 5, a roller 7 provided on the contact lever 5, a rotatable lever 9 held on a fixed shaft 8, and a fixed shaft 10. Rotatable lever 11, lever 9 and lever 1
And a link mechanism including an upper link 12 and a lower link 13 connected between the lever 1 and an open spring for urging the movable contact 2 in a direction away from the fixed contact 1 and pressing the roller 7 against the cam surface of the lever 9. A latch 15 for holding the link mechanism in an extended state against the action of the opening spring 14;
And a trip lever 16 for stopping the rotation of the lever 11 urged in the counterclockwise direction by the action of the opening spring 14.

When a trip signal is applied to the circuit breaker in the ON state shown in FIG. 14, the trip lever 16 operates to release the engagement with the lever 11, and the lever 1 is sequentially turned on.
1 rotates counterclockwise, and the lower link 13 and the upper link 1
2, the lever 9 rotates clockwise, the roller 7 moves on the cam surface of the lever 9, and the movable contact 2 moves to the left via the contact holder 3, and the lever 9 moves from the pair of fixed contacts 1. It is separated and becomes the OFF state shown in FIG. FIG.
In FIG. 15, in which some parts of the
1 is returned to the original position by the return spring. In order to limit the leftward movement of the movable contact 2 at the final stage of the above-described trip operation, a contact stopper 17 for preventing the movement of the connecting shaft 6 is provided in FIG.

When a trip signal is applied to cut off a large short-circuit current flowing through such a circuit breaker, the movable contact is generated by an extremely large electromagnetic repulsive force generated between the fixed contact 1 and the movable contact 2. Since 2 moves to the left at high speed, the contact lever 5 also rotates counterclockwise at high speed. As a result, the connecting shaft 6 collides vigorously with the contact stopper 17, and the movable contact 2 rebounds and moves rightward together with the contact lever 5 by the reaction, and re-contacts or remarkably approaches the fixed contact 1. There is a problem that the circuit breaker is degraded due to a decrease in insulation or the like. In order to prevent such a problem, the conventional circuit breakers shown in FIGS.
The latch mechanism 100 shown in FIG.

The latch mechanism 100 has a drive lever 20 fixed to the cross bar 4 and having a kick pin 18 and a control pin 19 attached thereto, and a control member 101 provided on a fixing member of the circuit breaker. The movable contact device is
It comprises a movable contact 2, a contact holder 3, a contact lever 5, a cross bar 4, a connecting shaft 6, a roller 7, a kick pin 18, a control pin 19, a driving lever 20, and the like. Both drive levers 20 are inserted. In these figures, the contact stopper 17
Is shown in dashed lines. The control member 101 includes an operation lever 103 rotatably held by a fixing pin 102.
, Stopper pin 104, and pin 1 of operation lever 103.
There is a pull spring 106 that constitutes a return spring provided between the stop pin 05 and the stopper pin 104.

The operation of the latch mechanism 100 will be described. FIG. 16 shows a main part when the circuit breaker is in the ON state. The operation lever 103 is pressed against the stopper pin 104 by the pulling spring 106, and its clockwise rotation is prevented. In this state, when a trip signal for interrupting the short-circuit current is applied, the drive lever 20 rotates counterclockwise at high speed, and the kick receiving portion 103a is kicked by the kick pin 18 as shown in FIG. Rotate counterclockwise against 106. As shown in FIG. 18, almost simultaneously with the collision of the connecting shaft 6 with the contact stopper 17, the operating lever 103 collides with the cross bar 4 constituting the operating lever stopper at the collision side 103 b, and the rebound force and the tension spring 10
6 causes the operating lever 103 to rotate clockwise. On the other hand, when the connecting shaft 6 collides with the contact stopper 17, the driving lever 20 starts to bounce clockwise together with the crossbar 4, and the control pin 19 of the driving lever 20 is moved to the contact of the operating lever 103 as shown in FIG. The rotation of the movable contact 2 is prevented from colliding with the control side 103c constituting the rebound preventing means, so that the movable contact 2 does not approach or re-contact the fixed contact 1.

[0007]

However, FIG.
When a larger short-circuit current flows in the state of
The electromagnetic repulsion also becomes larger, the rotation of the drive lever 20 in the counterclockwise direction and the rotation of the operation lever 103 in the counterclockwise direction become faster, and in FIG. 18, the rebound speed of the operation lever 103 after colliding with the crossbar 4 is also increased. It will be faster. As a result, the control pin 19 does not contact the control side 103c of the operation lever 103 and is in a state of idle swing, and the drive lever 20 rebounds and rotates clockwise. As a result, the movable contact 2 comes into contact with or approaches the fixed contact 1. There was a problem that sometimes. Therefore, the object of the present invention is to
An object of the present invention is to provide a circuit breaker that does not re-contact or approach a fixed contact immediately after a movable contact is opened even if a larger short-circuit current is interrupted.

[0008]

According to a first aspect of the present invention, there is provided a circuit breaker including a fixed contact, a movable contact device that contacts and separates from the fixed contact, and a movable contact. A contact stopper that limits the amount of separation of the slave device, an operation lever that rotates by colliding with a movable contact device that is being separated,
An operation lever stopper for limiting the rotation amount of the operation lever,
A return spring for the operating lever, a control lever that rotates when the operating lever that collides and rotates rotates, and an operating lever or control lever that engages with the movable contact device that has collided with the contact stopper and prevents its rebound movement. And a control means for controlling the movement of the contact bounce preventing means so as to engage with the movable contact device. With such a configuration, the movable contact device collides with the operation lever during the separation and rotates the operation lever at a high speed, and the control lever rotates via the operation lever. When the operating lever that has collided and collides with the operating lever stopper, the movement of the operating lever or the control lever having the contact bounce-preventing means is controlled to engage with the movable contact device that bounces behind and engages the bounce movement. Block.

According to a second aspect of the present invention, in the circuit breaker according to the first aspect, the control means is obtained by inertia of the control lever. With such a configuration,
The control lever rotated through the operation lever has an inertial force even if the operation lever collides with the operation lever stopper, and continues to rotate independently or controls the rebound rotation of the operation lever to prevent contact bounce. Control movement.

According to a third aspect of the present invention, there is provided the circuit breaker according to the second aspect, wherein the contact bounce-preventing means is provided on the control lever, the operating lever and the control lever are provided coaxially, and the control lever is connected to the operating lever. The two springs are coupled to each other by a coupling spring that urges in the return direction, and the return spring is provided between the fixed member and the operation lever.
With such a configuration, the control lever connected to the operation lever by the connection spring rotates together with the operation lever until the operation lever collides with the operation lever stopper. Even if the operating lever collides with the operating lever stopper and rebounds, the control lever having the contact rebound preventing means continues to rotate as it is against the coupling spring by inertia force and rebounds with a delay. Engage.

According to a fourth aspect of the present invention, in the circuit breaker according to the second aspect, the contact bounce-preventing means is provided on the control lever, and the operation lever and the control lever are provided coaxially, and the operation lever collides and rotates. When the control lever rotates together with the control lever and the control lever returns and rotates, the coupling lever rotates together with the operation lever, and the return spring of the operation lever is provided between the fixed member and the control lever. With such a configuration, even if the operating lever that has rotated and collided rotates the control lever via the coupling means, and the operating lever collides with the operating lever stopper and rebounds, the control lever having the contact rebound preventing means retains the inertial force. As a result, the rotating contact device continues to rotate against the return spring and engages with the movable contact device that rebounds with a delay. The operating lever which has been in the free state returns to a predetermined position via the coupling means when the control lever is returned and rotated by the return spring.

According to a fifth aspect of the present invention, in the circuit breaker according to the second aspect, the contact rebound preventing means is provided on the operating lever, the return spring is provided between the fixed member and the operating lever, and the operating lever is connected to the operating lever. The control lever is provided on a different axis,
The operating lever and the control lever are connected by a pin provided on one of them, a notch provided on the other and having both ends in the rotating direction, and a control lever return spring for pressing the pin against one end of the notch. With such a configuration, the control lever that is linked to the operation lever by the pin, one end of the notch, and the control lever return spring rotates together with the operation lever until the operation lever collides with the operation lever stopper. Even if the operating lever collides with the operating lever stopper and rebounds, the control lever continues to rotate against the control lever return spring due to the inertial force, and the other end of the notch engages with the pin to actuate the contact rebound preventing means. Bounce of the provided operation lever is suppressed, and the movable lever engages with the movable contact device that rebounds with a delay.

According to a sixth aspect of the present invention, in the circuit breaker of the second aspect, the contact rebound preventing means is provided on the operating lever, and the operating lever and the control lever are provided on different axes and connected by a link member. You are going to. With such a configuration, the control lever interlocked with the operation lever by the link member rotates together with the operation lever until the operation lever collides with the operation lever stopper.
Even if the operating lever collides with the operating lever stopper and a rebound rotational force is applied, the inertial force of the control lever in the direction opposite to the rebound rotational force is applied to the operation lever via the link member, and a contact element rebound preventing means is provided. The operating lever suppresses rebound of the operating lever and engages with the movable contact device that rebounds with a delay.

According to a seventh aspect of the present invention, there is provided a circuit breaker, comprising: a fixed contact; a movable contact device that contacts and separates from the fixed contact;
A contact stopper for limiting the amount of separation of the movable contact device;
An operating lever that rotates by colliding with the movable contact device that is in the process of being separated; a contact bounce preventing means provided on the operating lever that engages with the movable contact device that collides with the contact stopper to prevent rebound movement thereof; A return spring for the operation lever, a control lever rotatably held on one of the operation lever and the fixed member, a control lever stopper for preventing rotation of a control lever provided on the other, and a collision rotation of the operation lever. And a control spring for urging the control lever in a direction to reduce the collision rotational force of the operation lever when the control lever and the control lever stopper are engaged. With such a configuration, the movable contact device collides with the operation lever during the separation and rotates the operation lever at high speed.
The control lever engages with the control lever stopper during rotation of the operation lever, and the action of the control spring suppresses the rotational force of the operation lever provided with the contact rebound prevention means, and engages with the movable contact device that rebounds with a delay. I do.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. Since most of the circuit breakers in these embodiments are the same as those in the prior art, illustration and description thereof are omitted, and only the main parts will be described. Is assigned. 1 to 3 show a latch mechanism of a circuit breaker according to a first embodiment. The control member 31 of the latch mechanism 30 includes an operating lever 3 rotatably held by a fixed pin 32.
3 and a control lever 34; a pull spring 37 constituting a coupling spring provided between a pin 35 of the operation lever 33 and a pin 36 of the control lever 34; a stopper pin 38 and the operation lever 3
And a pull spring 40 constituting a return spring of the operating lever provided between the third pin 39 and the third lever 39.

The operation of the latch mechanism of the circuit breaker according to the first embodiment will be described. In FIG. 1, when the circuit breaker is in the ON state, the operation lever 33 is connected to the tension spring 4.
0 presses against the stopper pin 38 to prevent its clockwise rotation, and the control lever 34 is pressed against the pin 35 by the pulling spring 37 so that the operation lever 33 and the control lever 34 are integrated. When the drive lever 20 rotates counterclockwise in this state, the kick receiving portion 33a is kicked by the kick pin 18 and the operation lever 33 rotates counterclockwise with the control lever 34 against the tension spring 40, and the coupling shaft 6 Almost at the same time as collides with the contact stopper 17, the operating lever 33 collides with the cross bar 4 at the collision side 33b as shown in FIG. At this time, the control lever 34 is away from the crossbar 4 without colliding.

The operation lever 33 is rotated clockwise by the reaction of the collision with the cross bar 4 and the urging force of the tension spring 40. However, the control lever 34 does not rotate together with the operation lever 33, and the tension of the tension spring 37 is reduced by inertia. Continue to rotate counterclockwise in opposition. On the other hand, as shown in FIG. 3, the drive lever 20 which has started to bounce clockwise rotates its control pin 1
9 is a control lever 34 constituting contact bounce prevention means.
The rotation of the movable contact 2 and the fixed contact 1 is prevented by colliding with the control side 34a. When the short-circuit current is small, the rebound speed of the operation lever 33 is low, so that the control pin 19 collides with the control side 33c of the operation lever and the rebound of the drive lever 20 is prevented even without the operation of the control lever 34. You.

FIGS. 4 to 6 show a latch mechanism of a circuit breaker according to a second embodiment. The control member 51 of the latch mechanism 50
The operation lever 53 and the control lever 54, which are rotatably held by the fixed pins 52, and the pin 55 of the control lever 54
And a pull spring 57 that constitutes a return spring of the operation lever provided between the stopper pin 56.

The operation of the latch mechanism of the circuit breaker according to the second embodiment will be described. In FIG. 4, when the circuit breaker is in the ON state, the control lever 54
7, an operation lever 53 constituting a control lever stopper
The operation lever 53 urged clockwise by this pressing is pressed against the stopper pin 56, and its rotation is prevented. When the drive lever 20 rotates counterclockwise in this state, the kick receiving portion 53a is kicked by the kick pin 18 as in the first embodiment, and the operating lever 53 is rotationally urged against the pulling spring 57. The lever rotates counterclockwise together with the control lever 54 pushed by the pin 58 of the operation lever 53 by the urging. At approximately the same time when the connecting shaft 6 collides with the contact stopper 17, the operating lever 53 collides with the cross bar 4 at the collision side 53b as shown in FIG. Also at this time, the control lever 54 is at a position away from the crossbar 4 without colliding.

The operation lever 53 rotates clockwise due to the reaction that collides with the cross bar 4, but the control lever 54 does not rotate together with the operation lever 53, and rotates counterclockwise against the pulling spring 57 due to inertia. Continue. on the other hand,
As shown in FIG. 6, the drive lever 20 that has started to bounce clockwise collides with the control side 54a of the control lever 54 as shown in FIG. Prevent re-contact with 1.

FIGS. 7 to 9 show a latch mechanism of a circuit breaker according to a third embodiment. The control member 61 of the latch mechanism 60
The operation lever 6 rotatably held by the fixing pin 62
3, a control lever 65 rotatably held by a fixed pin 64, and a pull spring 67 constituting a return spring provided between the pin 66 of the operation lever 63 and the fixed pin 64. A notch 65a is formed in the control lever 65, and the pin 68 of the operating lever 63 can move within the range of the notch 65a.

The operation of the latch mechanism of the circuit breaker according to the third embodiment will be described. In FIG. 7, when the circuit breaker is in the ON state, the operating lever 63 urged clockwise by the pull spring 67 is pressed against the fixing pin 64, and a torsion spring 69 provided around the fixing pin 64. Control lever 65 urged in the counterclockwise direction by
Since the right end of the notch 65a is pressed against the pin 68, the respective rotations are prevented. When the drive lever 20 rotates counterclockwise in this state, the kick receiving portion 63a is kicked by the kick pin 18 as in the first embodiment, and the operating lever 63 is pulled by the tension spring 6.
7, the control lever 65 also rotates clockwise via the pin 68. At approximately the same time when the connecting shaft 6 collides with the contact stopper 17, the operating lever 63 collides with the cross bar 4 at the collision side 63 b, as shown in FIG. It is rotationally biased.

However, since the control lever 65 continues to rotate clockwise due to inertia, the upper end of the notch 65a collides with the pin 68 of the operating lever 63 which starts to rebound, resulting in the state shown in FIG. The control pin 19 of the drive lever 20 which starts the rebound rotation while being suppressed collides with the control side 63c of the operation lever 63 to prevent the movable contact 2 and the fixed contact 1 from re-contacting.

FIGS. 10 and 11 show a latch mechanism of a circuit breaker according to a fourth embodiment. The control member 71 of the latch mechanism 70 includes an operation lever 73 rotatably held by a fixed pin 72, a control lever 75 rotatably held by a fixed pin 74, a pin 76 of the operation lever 73, and a fixed pin 74. Spring 77 provided between the control lever 7 and the control lever 7
5 and a link plate 79 provided between the pin 78 of the operating lever 73 and the pin 76 of the operating lever 73.

The operation of the latch mechanism of the circuit breaker according to the fourth embodiment will be described. In FIG. 10, when the circuit breaker is in the ON state, the operation lever 73 urged clockwise by the pulling spring 77 is pressed against the fixing pin 74, and is clockwise rotated by the pulling spring 77 via the link plate 79. The control lever 75 biased to the
9 are pressed against the fixing pins 74, and their rotation is prevented. In this state, the drive lever 20
Is rotated counterclockwise, the kick receiving portion 73a is kicked by the kick pin 18 as in the first embodiment, and the operation lever 7 is rotated.
3 rotates counterclockwise against the tension spring 77, and the control lever 75 also rotates counterclockwise via the link plate 79. By this rotation, almost simultaneously with the connection shaft 6 colliding with the contact stopper 17, as shown in FIG.
b, the operation lever 73 collides with the cross bar 4 and rebounds and the action of the pull spring 77 causes the operation lever 73 to move.
Is biased to rotate clockwise. However, this rotational urging force is remarkably suppressed by the counterclockwise inertia of the control lever 75 and the pins 76, 78, and the fixing pin 74 being substantially aligned, and the drive lever 20 that has started rebounding starts rotating.
Control pin 19 collides with the control side 73c of the operating lever 73 to prevent re-contact between the movable contact 2 and the fixed contact 1.
The re-contact prevention characteristics can be adjusted by the positions of the pins 76, 78 and the fixing pins 74.

FIGS. 12 and 13 show a latch mechanism of a circuit breaker according to a fifth embodiment. The control member 81 of the latch mechanism 80 includes an operation lever 83 rotatably held by a fixed pin 82, a fixed pin 84, a control lever 86 rotatably held by a pin 85 of the operation lever 83, and an operation lever 86. A pulling spring 87 is provided between the pin 89 of the 83 and the fixed pin 84 and constitutes a return spring of the operating lever.

The operation of the latch mechanism of the circuit breaker according to the fifth embodiment will be described. In FIG. 12, when the circuit breaker is in the ON state, the operating lever 83 urged clockwise by the pulling spring 87 is pressed against a fixed pin 84, and the control lever 83 is provided around the pin 85. The control lever 86 urged in the counterclockwise direction by the torsion spring 88 forming a spring is pressed against the projection of the operation lever 83, and its rotation is prevented. When the drive lever 20 rotates counterclockwise in this state, the kick receiving portion 83a is kicked by the kick pin 18 as in the first embodiment, and the operation lever 83 and the control lever 86 are integrally opposed to the pulling spring 87. Rotates counterclockwise. Due to this rotation, as shown in FIG. 13, immediately before the connecting shaft 6 collides with the contact stopper 17, the control lever 86 engages with the fixing pin 84 constituting the control lever stopper, thereby preventing its rotation. Operating lever 8
3, the control pin 19 on the drive lever 20 that has started to rebound and collides with the control side 83c of the operation lever 83 before the collision side 83b collides with the crossbar 4. The movable contact 2 and the fixed contact 1 are prevented from re-contacting. The control lever 86 may be provided on a fixing member, and the fixing pin 84 may be provided on the operation lever 83 to reduce the rotation speed of the operation lever 83.

Although the embodiment of the present invention has been described above, the embodiment of the present invention disclosed above is merely an example, and the scope of the present invention is not limited to the above-described embodiment of the present invention. It is not limited. The scope of the present invention is:
It is indicated by the description of the appended claims, and is intended to include all modifications within the meaning and scope equivalent to the description of the claims.

[0029]

As described above, according to the present invention,
With a simple configuration that only requires the operation lever, the control lever, and the control means of the contact bounce-preventing means, the movable contact can be prevented from re-contacting or remarkably approaching the fixed contact immediately after the separation. There is an effect that a small circuit breaker having a short-circuit breaking current can be configured.

[Brief description of the drawings]

FIG. 1 is an essential part explanatory diagram for explaining an operation of a latch mechanism of a circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a view showing the operation of the latch mechanism of the circuit breaker according to the first embodiment.

FIG. 3 is a view showing the operation of the latch mechanism of the circuit breaker according to the first embodiment;

FIG. 4 is an explanatory view of a main part for explaining an operation of a latch mechanism of a circuit breaker according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the second embodiment.

FIG. 6 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the second embodiment.

FIG. 7 is an explanatory view of a main part for explaining an operation of a latch mechanism of a circuit breaker according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the third embodiment.

FIG. 9 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the third embodiment.

FIG. 10 is an explanatory view of a main part for explaining an operation of a latch mechanism of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 11 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the fourth embodiment in the middle of operation.

FIG. 12 is an explanatory view of a main part for explaining an operation of a latch mechanism of a circuit breaker according to a fifth embodiment of the present invention.

FIG. 13 is a diagram illustrating the operation of the latch mechanism of the circuit breaker according to the fifth embodiment during operation.

FIG. 14 is an overall side view of the conventional circuit breaker in an ON state.

FIG. 15 is an overall side view of the circuit breaker of FIG. 14 in an OFF state.

FIG. 16 is an explanatory view of a principal part for explaining the operation of the latch mechanism of the circuit breaker of FIG. 14;

FIG. 17 is a diagram showing the latch mechanism of the circuit breaker shown in FIG. 14 in the middle of operation.

FIG. 18 is a view showing the operation of the latch mechanism of the circuit breaker of FIG. 14 in the middle of operation.

FIG. 19 is a view showing the operation of the latch mechanism of the circuit breaker of FIG. 14 in the middle of operation.

[Explanation of symbols]

1: fixed contact, 2: movable contact, 5: contact lever,
4 crossbar, 6 connecting shaft, 17 contact stopper,
18 kick pin, 19 control pin, 20 drive lever, 30, 50, 60, 70, 80 latch mechanism, 3
1, 51, 61, 71, 81 ... control members, 33, 53,
63, 73, 83... Operating lever, 33a, 53a, 63
a, 73a, 83a ... kick receiving portion, 33b, 53b,
63b, 73b, 83b: collision side, 33c, 34a, 5
4a, 63c, 73c, 83c ... control sides, 34, 54,
65, 75, 86 ... control lever, 37, 40, 57, 6
7, 77, 87 ... pull spring, 59, 68 ... pin, 65a
... notches, 69, 88 ... torsion springs, 79 ... link plates,
84 fixing pin.

Claims (7)

[Claims] 1. A fixed contact, a movable contact device that contacts and separates from the fixed contact, a contact stopper that limits an amount of opening of the movable contact device, and the movable contact that is in the process of being separated. An operating lever that rotates by colliding with the slave device; an operating lever stopper that limits the rotation amount of the operating lever; a return spring of the operating lever; a control lever that rotates when the operating lever collides and rotates; Contact bounce prevention means provided on the operation lever or control lever for engaging with the movable contact device that has collided with the child stopper and preventing rebound movement thereof, and the contact so as to engage with the movable contact device. Control means for controlling the movement of the child rebound preventing means. 2. The circuit breaker according to claim 1, wherein said control means is obtained by inertia of said control lever. 3. The control device according to claim 1, wherein the contact bounce-preventing means is provided on the control lever, and the operating lever and the control lever are provided coaxially and a coupling spring for urging the control lever in a returning direction of the operating lever. 3. The circuit breaker according to claim 2, wherein the return springs are connected to each other, and are provided between a fixed member and the operation lever. 4. The contact bounce preventing means is provided on the control lever, the operating lever and the control lever are provided coaxially, and the control lever rotates together when the operating lever collides and rotates. 3. The circuit according to claim 2, further comprising: coupling means for rotating the operation lever together when the control lever is rotated back, wherein a return spring of the operation lever is provided between a fixed member and the control lever. Circuit breaker. 5. The contact bounce preventing means is provided on the operating lever, the return spring is provided between a fixed member and the operating lever, and the operating lever and the control lever are provided on different axes. The operating lever and the control lever are connected by a pin provided on one of them and a notch provided on the other and having both ends in the rotation direction and a control lever return spring for pressing the pin against one end of the notch. 3. The circuit breaker of claim 2, wherein: 6. The operation lever according to claim 2, wherein the contact bounce preventing means is provided on the operation lever, and the operation lever and the control lever are provided on different axes and are connected by a link member. Circuit breaker. 7. A fixed contact, a movable contact device that contacts and separates from the fixed contact, a contact stopper that limits an amount of separation of the movable contact device, and the movable contact that is in the process of being separated. An operation lever that rotates in collision with the slave device; a contact bounce preventing means provided in the operation lever that engages with the movable contact device that collides with the contact stopper to prevent the movement thereof; A return spring for a lever, a control lever rotatably held on one of the operation lever and the fixed member, and a control lever stopper for preventing rotation of the control lever provided on the other side; and a collision rotation of the operation lever. A control spring that urges the control lever in a direction to reduce the collision rotational force of the operation lever when the control lever and the control lever stopper are engaged on the way. A circuit breaker characterized by the above.