JP6922673B2 - Circuit breaker - Google Patents

Description

The present invention relates to a circuit breaker having a fixed contact and a movable contact, and provided with an electromagnetic operation mechanism for charging the movable contact into the fixed contact.

A conventional circuit breaker is composed of a toggle mechanism and a closing spring, and uses the energy released when the stored closing spring is released to push a movable contact beyond the dead center of the toggle mechanism. The method was common (see, for example, Patent Document 1).
On the other hand, there is also known a circuit breaker in which the movable contact is turned on by the electromagnetic operation mechanism and the movable contact is opened by a spring for opening the pole (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2000-209719 Japanese Unexamined Patent Publication No. 49-11167

When the movable contact is inserted beyond the dead center of the toggle mechanism, the insertion speed of the movable contact can be increased, but on the other hand, it is necessary to open the movable contact beyond the dead center even when shutting off, ensuring the opening speed. Therefore, there is a problem that the number of parts increases and the structure of the circuit breaker becomes complicated.
In addition, when the movable contact is charged by the electromagnetic operation mechanism, the structure of the circuit breaker can be simplified, but it is necessary to charge the movable contact against the spring for opening the pole, and the speed at which the movable contact is charged is increased. There was a problem that it was difficult to make it faster.

The present invention has been made to solve the problems in such a conventional circuit breaker. The circuit breaker in which the movable contact is input by the electromagnetic operation mechanism and the movable contact is opened by the opening spring. The present invention provides a circuit breaker capable of reducing the number of component parts and reducing the cost while ensuring the closing speed of the movable contact.

The circuit breaker according to the present invention has an opening / closing contact that opens / closes an electric circuit by a movable contact provided in a rotatable movable contactor, and an opening / closing contact that is urged in a direction to open / close the opening / closing contact to change from an open state to a contact state. driving an opening and closing device having a latch biasing force to hold accumulated opening spring, and the biasing force increases, the electromagnetic operating mechanism of the order to put switchgear against the biasing force, the switching contact towards The switchgear has a first link for driving a movable contactor at one end, a second link for rotatably holding the other end of the first link, and a second link. The switchgear mechanism is equipped with a shaft that rotatably holds the link and is driven to rotate by the electromagnetic operation mechanism, and the toggle mechanism has the opening / closing contact completed before the dead center where the first link and the second link are aligned. Is what becomes.

According to the circuit breaker according to the present invention, the number of parts constituting the circuit breaker can be reduced and the cost can be reduced while ensuring the closing speed of the movable contact.

It is a figure which shows the structural example of the circuit breaker which concerns on Embodiment 1 of this invention. It is a figure which shows the structure in the housing of the circuit breaker which concerns on Embodiment 1 of this invention. It is an enlarged view of the electromagnetic operation mechanism part shown in FIG. 2 and the upper part of this electromagnetic operation mechanism part. It is a figure which shows the electromagnetic operation mechanism part which concerns on Embodiment 1 of this invention. It is a figure which shows the closing state of the circuit breaker which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the stroke of the movable iron core of the electromagnetic operation mechanism part and the load applied to the drive shaft from the time of opening a pole to the time of putting in according to Embodiment 1 of this invention.

Embodiment 1.
The circuit breaker according to the first embodiment is a circuit breaker that opens and closes an electric circuit such as a low-voltage distribution line, and cuts off the electric circuit by detecting at least one of an overcurrent and an electric leakage. In the following, for convenience of explanation, the Z-axis positive direction is upward, the Z-axis negative direction is downward, the X-axis positive direction is right, the X-axis negative direction is left, and the Y-axis positive direction is forward. The negative direction of the Y axis is the rear. Further, in the following, clockwise and counterclockwise mean clockwise and counterclockwise in the drawings described later.

1 and 2 are explanatory views for explaining the operation of the circuit breaker according to the first embodiment of the present invention.
Further, FIGS. 3 and 4 are explanatory views for explaining the electromagnetic operation mechanism unit according to the first embodiment of the present invention. FIG. 5 is a diagram showing a completed state of the circuit breaker according to the first embodiment of the present invention.

As shown in FIG. 1, the circuit breaker 100 according to the first embodiment includes a housing 1 formed of an insulating member, a first fixed conductor 10 connected to a power supply side conductor (not shown), and a conductor (not shown). A flexible conductor that electrically connects the second fixed conductor 11 connected to the load-side conductor, the mover 20 having the movable contact 20a, and the second fixed conductor 11 and the mover 20 to have flexibility. 30 and.

Inside the housing 1, a first space portion 7 and a second space portion 8 partitioned by an insulating wall 3 are formed. The first fixed conductor 10 extends from the outside of the housing 1 to the first space portion 7 and penetrates the wall portion 2 of the housing 1. One end 101 of the first fixed conductor 10 projects outward and is connected to a power supply side conductor (not shown), and the other end 102 of the first fixed conductor 10 is arranged and fixed in the first space 7. Contact 10a is provided.

Like the first fixed conductor 10, the second fixed conductor 11 extends from the outside of the housing 1 to the first space portion 7 and penetrates the wall portion 2 of the housing 1. One end 111 of the second fixed conductor 11 projects outward and is connected to a load-side conductor (not shown), and the other end 112 of the second fixed conductor 11 is arranged in the first space 7.

A movable contact 20a is provided at one end 201 of the mover 20, and the other end 202 of the mover 20 is connected to one end 301 of the flexible conductor 30. The other end 302 of the flexible conductor 30 is connected to the other end 112 of the second fixed conductor 11.

Further, the circuit breaker 100 was rotatably held by the holder 40 rotatably attached to the other end 112 of the second fixed conductor 11, the pressure contact spring 41 held by the holder 40, and the holder 40. A movable child pin 42 is provided. The pressure contact spring 41 urges the mover 20 to rotate clockwise around the mover pin 42, and when the movable contact 20a provided on the mover 20 is connected to the fixed contact 10a, the fixed contact is made. A contact pressure is applied between the 10a and the movable contact 20a.

The circuit breaker 100 includes a toggle mechanism unit 50 connected to the mover 20, an electromagnetic operation mechanism unit 60 that moves the mover 20 via the toggle mechanism 50, and a toggle mechanism unit 50 and an electromagnetic operation mechanism unit 60. The circuit breaker 100 includes a transmission mechanism unit 70 to be connected, and a trip mechanism unit 80 for maintaining the charging completed state and releasing the charging completed state in the circuit breaker 100. The toggle mechanism unit 50 is arranged so as to straddle the first space unit 7 and the second space unit 8, and the electromagnetic operation mechanism unit 60, the transmission mechanism unit 70, and the tripping mechanism unit 80 are second. It is arranged in the space portion 8.

Here, the closing state is a state in which the fixed contact 10a and the movable contact 20a are in contact with each other, and the closing operation or the closing operation is an operation or operation of moving the movable contact 20a to bring it into contact with the fixed contact 10a. show. The pulling operation or the pulling operation indicates an operation or an operation of separating the movable contact 20a from the fixed contact 10a.

As shown in FIG. 2, the toggle mechanism portion 50 has an operation arm 51 in which one end portion 511 is rotatably connected to the mover 20 by a mover pin 42, and one end portion 531 is attached to the other end portion 512 of the operation arm 51. A connecting plate 53, which is an example of a rotating member rotatably connected by a link pin 52, and a shaft 54 fixed to the other end 532 of the connecting plate 53 and rotating around an axis 56, and fixed to the shaft 54. A lever 55 that rotates about the axis 56 together with the shaft 54.
The "first link" described in the claims is the operation arm 51, and the "second link" is the connecting plate 53.

The electromagnetic operation mechanism unit 60 is arranged below the lever 55, and is fixed to the support portions 4 and 5 protruding from the insulating wall 3 of the housing 1 toward the second space portion 8.

As shown in FIG. 2, the electromagnetic operation mechanism unit 60 is movable so as to be able to reciprocate linearly in the vertical direction with a fixed iron core 61 formed of a magnetic material and an electromagnetic coil 62 fixed inside the fixed iron core 61. It includes an iron core 63 and a drive shaft 64 fixed to the movable iron core 63. The drive shaft 64 reciprocates in the vertical direction at a position spaced leftward from the axis 56. The movable iron core 63 and the drive shaft 64 may be fixed, and the method of fixing the movable iron core 63 and the drive shaft 64 does not matter.

The drive shaft 64 is arranged inside the fixed iron core 61 through a gap (not shown). The drive shaft 64 moves in the vertical direction inside the fixed iron core 61 by energizing the electromagnetic coil 62.

As shown in FIG. 3, the transmission mechanism unit 70 that connects the toggle mechanism unit 50 and the electromagnetic operation mechanism unit 60 includes connecting pins 71 and 72 and a connecting link 73. One connecting hole 74 of the connecting link 73 is pivotally mounted by a connecting pin 71 in a connecting hole 65 formed at the tip of the drive shaft 64. The other connecting hole 75 of the connecting link 73 is pivotally mounted by a connecting pin 72 in a connecting hole (not shown) formed in the middle of the connecting plate 53.

The tripping mechanism portion 80 is erected between the frame 81 fixed to the housing 1 and one end portion 551 of the frame 81 and the lever 55, and urges the mover 20 and the movable contact 20a in a direction to be separated from each other. The frame 81 is provided by an opening spring 82 in which the urging force of the movable contact 20a increases from the open state to the contact state, a trip bar 83 rotatably supported by the frame 81, and a shaft 843 provided at one end 841. A trip lever 84 rotatably supported on the shaft and a reset spring 85 installed between the frame 81 and the trip lever 84 are provided.

The frame 81 is connected to the insulating wall 3 by a fixing member (not shown). The fixing member for fixing the frame 81 to the insulating wall 3 is, for example, a fixing means such as caulking a pin. The frame 81 faces a part of the toggle mechanism part 50 and at least a part of the transmission mechanism part 70 when viewed from the extending direction of the axis 56 which is the axial direction of the connecting plate 53, and a part of the toggle mechanism part 50 and the transmission. It covers at least a part of the mechanical portion 70.

One end 821 of the open pole spring 82 is held by the connecting pin 86, and the connecting pin 86 is inserted into a connecting hole (not shown) formed in the one end 551 of the lever 55. Further, the other end 822 of the opening pole spring 82 is held by the connecting pin 87, and the connecting pin 87 is inserted into a connecting hole (not shown) formed in the frame 81. As a result, the open pole spring 82 is erected between the frame 81 and the lever 55.

In a state where the open pole spring 82 is erected between the frame 81 and the lever 55, the open pole spring 82 stores energy when the lever 55 is rotated clockwise around the axis 56 of the shaft 54. It is a tension spring that is made. The open pole spring 82 applies a force to the lever 55 in the counterclockwise direction about the axis 56.

A shaft shaft 833 extending in a direction perpendicular to the paper surface is fixed to the trip bar 83, and the shaft shaft 833 is rotatably inserted into a rotation hole (not shown) provided in the frame 81. The trip bar 83 has a semicircular portion 831 formed in a semicircular shape, and as will be described later, when the circuit breaker 100 is in the closing state, the arc portion of the semicircular portion 831 in the trip bar 83 The trip lever 84 is locked by the 832.

The trip lever 84 is an engaging surface 844 provided on the other end 842 side, and engages with an engaging pin 553 provided on the other end 552 of the lever 55. Further, one end portion 851 of the reset spring 85 is locked in the hole 845 provided between the shaft 843 of the trip lever 84 and the engaging surface 844. The other end 852 of the reset spring 85 is held by an engaging pin (not shown) on the frame 81. As a result, the reset spring 85 is installed between the frame 81 and the trip lever 84, and the trip lever 84 is urged clockwise by the reset spring 85. However, in the state shown in FIG. 3, the engagement pin 553 of the lever 55 comes into contact with the engagement surface 844, so that the clockwise rotation of the trip lever 84 is prevented.
Further, between the shaft 843 and the engaging surface 844, an engaging recess 846 with which the engaging pin 553 is engaged in the fully loaded state is provided.

Next, the details of the electromagnetic operation mechanism unit 60 will be described.
As shown in FIG. 4, in the fixed iron core 61, the distance between the first suction surface 611 that sucks the movable iron core 63 and the movable iron core 63 is the distance between the first suction surface 611 and the movable iron core 63. It has a longer second suction surface 612 and.
Similarly, the movable iron core 63 has a first suction surface 631 facing the first suction surface 611 and a second suction surface 632 facing the second suction surface 612.

Then, assuming that the distance between the first suction surface 611 that sucks the movable iron core 63 and the first suctioned surface 631 of the movable iron core 63 is A, the movable contact 20a resists the urging force of the open pole spring 82. The distance B, which is the stroke at which the movable iron core 63 moves for charging, has a relationship of A <B. Further, in this embodiment, the inter-plane distance between the second suction surface 612 and the second suction surface 632 is equal to the distance B, which is the stroke at which the movable iron core 63 moves for charging.

The "first distance" described in the claims is the stroke in which the movable iron core 63 moves, and the "second distance" is the first suction surface 611 and the movable iron core 63 that attract the movable iron core 63. This is the inter-plane distance from the first surface to be adsorbed 631.

Next, the operation of the circuit breaker 100 will be described.
In the state shown in FIG. 1, the fixed contact 10a and the movable contact 20a are separated from each other, and the circuit breaker 100 is in a detached state. The closing operation of the circuit breaker 100, which performs the closing operation from the state shown in FIG. 1, will be described. FIG. 5 is a diagram showing the circuit breaker 100 in the closed state.

When the movable iron core 63 moves upward by energizing the electromagnetic coil 62 of the electromagnetic operation mechanism unit 60 from the pulled state shown in FIG. 1, it is fixed to the movable iron core 63 as the movable iron core 63 moves upward. The drive shaft 64 also moves upward.

When the drive shaft 64 moves upward, the lever 55 connected to the drive shaft 64 by the transmission mechanism unit 70 rotates clockwise around the axis 56. As the shaft 54 and the connecting plate 53 rotate clockwise due to this rotation, as shown in FIG. 5, the operating arm 51 constituting the toggle mechanism is driven together with the connecting plate 53, and the connecting plate 53 and the operating arm 51 are brought into contact with each other. It is in a state of being arranged in a substantially straight line before the dead center that becomes a straight line.

As a result, the mover 20 moves to the right, and the movable contact 20a comes into contact with the fixed contact 10a. Then, a contact pressure is applied between the fixed contact 10a and the movable contact 20a by the contact pressure spring 41, and the charging completed state is maintained. In the fully charged state, the first fixed conductor 10 is electrically connected to the second fixed conductor 11 via the fixed contact 10a, the movable contact 20a, the mover 20, and the flexible conductor 30.

Further, when the lever 55 rotates clockwise about the axis 56, the engaging pin 553 of the lever 55 rises along the engaging surface 844 of the trip lever 84 and the engaging recess 846, as shown in FIG. To reach. When the engaging pin 553 reaches the engaging recess 846, the trip lever 84 rotates clockwise due to the urging force of the reset spring 85. The rotation of the trip lever 84 disengages the semicircular portion 831 of the trip bar 83 from the trip lever 84, and the trip bar 83 also rotates clockwise. Then, by engaging the trip lever 84 with the arc portion 832 of the trip bar 83, the counterclockwise rotation of the trip lever 84 is restricted, and the closing operation by the electromagnetic operation mechanism unit 60 is completed.

The closing operation of the electromagnetic operation mechanism unit 60 will be described in detail.
First, the relationship between the moving position of the movable iron core 63 and the load amount applied to the electromagnetic operation mechanism unit 60 will be described. FIG. 6 is a diagram showing the relationship between the moving position of the movable iron core and the load amount applied to the electromagnetic operation mechanism portion according to the present embodiment. The movable iron core 63 moves in a range from the position shown in FIG. 1 to the insertion completion position shown in FIG.

In the following, the upward movement of the movable iron core 63 will be described as forward, and the downward movement of the movable iron core 63 will be described as backward. Further, the moving position of the movable iron core 63 when moving forward is described as a forward position, and the moving position of the movable iron core 63 when moving backward is described as a backward position. Further, the load applied to the electromagnetic operation mechanism unit 60 when the movable iron core 63 is advanced is described as a forward load, and the load applied to the electromagnetic operation mechanism unit 60 when the movable iron core 63 is retracted is described as a backward load.

As shown in FIG. 6, when the forward position of the movable iron core 63 is the cutoff state position from the cutoff state position to the contact contact start position, transmission is performed in a state where the fixed contact 10a and the movable contact 20a are not in contact with each other. The mechanism unit 70 is driven. Therefore, when the forward position of the movable iron core 63 is the cutoff state position, the load applied to the electromagnetic operation mechanism unit 60 is relatively small.

On the other hand, as shown in FIG. 4, the electromagnetic operation mechanism unit 60 has a first suction surface 611 for sucking the movable iron core 63 and a first suction surface of the movable iron core 63 with a distance B which is a stroke of the movable iron core 63. Since it is configured to be longer than the surface-to-plane distance A with 631, when an operating current is passed through the electromagnetic coil 62 of the electromagnetic operating mechanism unit 60, as shown in FIG. 6, the initial driving force is the stroke distance B and the surface. It becomes larger than the case where the distance A is equal. This initial large driving force is used to accelerate the movable iron core 63 and the drive shaft 64 to increase the forward speed.

Then, when the forward position of the movable iron core 63 becomes the contact contact start position, the movable contact 20a starts to come into contact with the fixed contact 10a, so that the connecting plate 53 and the lever 55 apply the reaction force from the pressure contact spring 41 to the mover. Since it is received as a load torque in the counterclockwise direction centered on the shaft 54 via the pin 42 and the link pin 52, the load applied to the electromagnetic operation mechanism unit 60 increases sharply.
Therefore, the load of the electromagnetic operation mechanism unit 60 exceeds the driving force of the electromagnetic operation mechanism unit 60, but the movable iron core 63 and the drive shaft 64 have reached a sufficient speed due to the acceleration up to that point. According to the law of inertia, it keeps moving forward while slowing down the forward speed.

When the movable iron core 63 and the drive shaft 64 are further advanced, the connecting plate 53 and the operating arm 51 are brought into a state of being close to a straight line, and the toggle mechanism portion 50 composed of the connecting plate 53 and the operating arm 51 approaches the dead center. Therefore, before the moving speeds of the movable iron core 63 and the drive shaft 64 become zero, they are perpendicular to the straight line connecting the axis 56 and the link pin 52 in the reaction force from the pressure spring 41 acting on the link pin 52 which is the point of action. The directional component sharply decreases. As a result, the load torque in the counterclockwise direction centered on the axis 56 begins to decrease. In response to this decrease in load torque, the load load of the electromagnetic operating mechanism unit 60 required to rotate the connecting plate 53 and the lever 55 also starts to decrease. Therefore, the driving force of the electromagnetic operation mechanism unit 60 exceeds the charging load again, and the movable iron core 63 and the driving shaft 64 reach the charging completion position while accelerating again.

When the closing operation by the electromagnetic operation mechanism unit 60 is completed, the energization of the electromagnetic coil 62 is also stopped, and the driving force of the lever 55 by the drive shaft 64 in the clockwise direction is lost. Then, the lever 55 receives the urging force of the opening pole spring 82 and exerts a force to rotate in the counterclockwise direction. The force of this lever 55 attempts to rotate the trip lever 84 in the counterclockwise direction via the engagement pin 553.
However, due to the engagement between the trip lever 84 and the arc portion 832 of the trip bar 83, the rotation of the trip lever 84 that tries to rotate counterclockwise at the closing completion position is restricted, and the closing completed state is maintained. ..

As described above, when the circuit breaker 100 is in the cutoff state, a constant initial contact pressure is applied to the pressure contact spring 41 in advance, and the fixed contact 10a starts from the moment when the movable contact 20a starts contacting the fixed contact 10a. The contact pressure of the movable contact 20a with respect to the movable contact 20a is set to be strong. Therefore, when the circuit breaker 100 is energized, the occurrence of separation between the contacts due to the electromagnetic repulsive force generated between the movable contact 20a and the fixed contact 10a is prevented, and a trip command to be described later is issued. The opening speed of the later movable contact 20a and the fixed contact 10a, that is, the opening speed can be increased.

The operation of the circuit breaker 100 when the pulling operation for separating the movable contact 20a from the fixed contact 10a is performed from the closing state will be described.
In the closing state shown in FIG. 5, the opening pole spring 82 and the pressure contact spring 41 are accumulating, and the lever 55 applies a load in the counterclockwise direction around the axis 56 of the shaft 54. It is in a state.

When a trip command is given to the circuit breaker 100, the trip bar 83 is driven to rotate counterclockwise by an actuator (not shown) provided on the circuit breaker 100. When the trip bar 83 rotates counterclockwise, the arc portion 832 of the trip bar 83 and the trip lever 84 are disengaged. Therefore, the trip lever 84 rotates counterclockwise, and the engagement pin 553 and the engagement recess 846 are disengaged. As a result, the lever 55 and the connecting plate 53 rotate counterclockwise due to the reaction force of the opening pole spring 82 and the pressure contact spring 41, and the other end 512 of the operating arm 51 rotates with the counterclockwise rotation of the lever 55. Move upwards.

When the other end 512 of the operation arm 51 moves upward, the one end 511 of the operation arm 51 moves to the left. Therefore, the mover 20 moves to the left, and the movable contact 20a separates from the fixed contact 10a. As a result, the circuit breaker 100 cuts off the electric circuit including the first fixed conductor 10 and the second fixed conductor 11.

According to the present embodiment, the movable iron core 63 and the movable iron core 63 that move the first distance B in order to input both contacts 10a and 30a against the urging force of the opening pole spring 82 and the pressure contact spring 41 are attracted. Since the electromagnetic operation mechanism unit 60 having the fixed iron core 61 in which the inter-plane distance A between the first suction surface and the movable iron core 63 is shorter than the first distance B is provided, the movable contact 20a is input to the electromagnetic operation mechanism unit 60. Since the opening speed of the movable contact is secured while the opening of the movable contact 20a is performed by the opening spring 82, the number of parts constituting the circuit breaker can be reduced and the cost can be reduced.

Further, a movable iron core 63 that moves a first distance B in order to input both contacts 10a and 30a against the urging force of the opening pole spring 82 and the pressure contact spring 41, and a first suction surface that attracts the movable iron core 63. Since the electromagnetic operation mechanism unit 60 having the fixed iron core 61 having the face-to-face distance A between the movable iron core 63 and the movable iron core 63 is shorter than the first distance B, the charging operation is performed, so that the driving force of the movable iron core 63 increases during the charging operation, and the opening pole spring And the load of the pressure contact spring can be increased, and the breaking performance can be improved.

Further, since the toggle mechanism portion 50 including the operation arm 51 and the connecting plate 53 is configured to complete the insertion of the movable contact 20a and stop the advance of the movable iron core 63 before the dead center is exceeded, the movable iron core 63 is cut off from the insertion state. Since the configuration of the tripping mechanism unit 80 can be simplified without exceeding the dead center even at the time of transition to the state, it is possible to reduce the size and cost of the circuit breaker.

Further, since the toggle mechanism portion 50 including the operation arm 51 and the connecting plate 53 is configured so that the movable contact 20a is completely inserted and the movable iron core 63 stops advancing before the toggle mechanism portion 50 including the connecting plate 53 exceeds the dead center, the link pin 52 is connected. Since the component in the direction perpendicular to the straight line connecting the axial center 56 and the link pin 52 in the reaction force from the working pressure contact spring 41 is reduced, the electromagnetic operation mechanism unit 60 receives from the pressure contact spring 41 via the transmission mechanism unit 70. The load is also reduced, and the closing operation can be completed even if the load of the opening pole spring 82 is increased.

Further, since the toggle mechanism portion 50 including the operation arm 51 and the connecting plate 53 is configured so that the movable contact 20a is completely inserted and the movable iron core 63 stops advancing before the toggle mechanism portion 50 including the connecting plate 53 exceeds the dead center, the link pin 52 is connected. Since the component in the direction perpendicular to the straight line connecting the axial center 56 and the link pin 52 in the reaction force from the working pressure contact spring 41 is reduced, the electromagnetic operation mechanism unit 60 receives from the pressure contact spring 41 via the transmission mechanism unit 70. The load can also be reduced, the load of the opening pole spring 82 can be increased, the opening speed of the movable contact 20a can be increased, and the breaking performance can be improved.

1 housing, 2 walls, 3 insulated walls, 4, 5 supports,
7 1st space part, 8 2nd space part,
10 1st fixed conductor, 10a fixed contact, 11 2nd fixed conductor,
20 movers, 20a movable contacts, 30 flexible conductors, 41 pressure springs,
50 toggle mechanism, 51 operation arm, 52, 53 link pin,
54 shaft, 55 lever, 60 electromagnetic operation mechanism,
61 Fixed core, 62 Electromagnetic coil, 63 Movable core, 64 Drive shaft,
70 Transmission mechanism, 71, 72 connecting pins, 73 connecting links,
80 trip mechanism, 82 open pole spring, 83 trip bar, 84 trip lever,
85 reset spring, 100 circuit breaker,
611 first suction surface, 612 second suction surface,
631 First surface to be adsorbed, 632 Second surface to be adsorbed.

Claims (5)

An opening / closing contact that opens and closes the electric path by a movable contact provided on the rotatable movable contact
An opening / closing device having an opening spring that urges the opening / closing contact in a direction to open and detach the opening / closing contact to increase the urging force from the open state to the closed state, and a tripgear that accumulates and holds the urging force. When,
Includes a solenoid operating mechanism of the order to put the switchgear against the biasing force, and a toggle mechanism for driving the switching contact,
The switchgear makes the first link, one end of which drives the movable contact, a second link that rotatably holds the other end of the first link, and the second link rotatable. The electromagnetic operation mechanism unit is provided with a shaft that is held and driven to rotate.
The toggle mechanism unit is a circuit breaker characterized in that the opening / closing contact is completed before the dead center where the first link and the second link are aligned. The electromagnetic operation mechanism unit has a movable iron core that moves a first distance, and a fixed iron core in which the distance between the first suction surface that attracts the movable iron core and the movable iron core is shorter than the first distance. The circuit breaker according to claim 1. The circuit breaker according to claim 1 or 2 , wherein the electromagnetic operation mechanism portion has a second suction surface for sucking the movable iron core. The circuit breaker according to claim 3 , wherein the distance between the second suction surface and the movable iron core is longer than the distance between the first suction surface and the movable iron core. The circuit breaker according to claim 4 , wherein the distance between the second suction surface and the movable iron core is the same as the first distance.

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