Patent Description:
Circuit breakers, especially DC circuit breakers, are required to cut off the circuit short-circuit current for a short time, and the operation mechanism needs to open the main contact in a short time. Therefore, a switch operation mechanism as in <CIT> has been proposed.

<CIT> shows a compact load break switch having at least one vacuum interrupter connected between two terminals carried by respective insulating bushings through a current exchange assembly. The vacuum interrupter is disposed within one of the insulating bushings, and a current exchange insulating housing having portions which extend telescopically into both insulating bushings, provides adequate creepage distance through air from the vacuum interrupter and the current exchange assembly to a grounded housing for the load break switch. Also, a current transformer is disposed about the insulating housing to provide remote indication of the flow of fault current through the current exchange assembly. The switch operating mechanism includes: a torsion spring which when fully charged, is capable of opening and closing the switch several times; a motor driven spring charging mechanism, for fully recharging the torsion spring after each switch operation; a solenoid actuated latch mechanism which may be remotely actuated to open or close the switch; a lockout mechanism for preventing closure of the switch when the torsion spring has insufficient stored energy to open the switch thereafter without being recharged; auxiliary switches for remote indication of the position of the load break switch; and manually-opened mechanisms for recharging the torsion spring and operating the load break switch. <CIT> shows A switch control device includes a prestressing spring, a make-break contact, and at least one of a device for closing a circuit and a device for opening the circuit, wherein the device for closing the circuit includes a first elastic member, closing the make-break contact with a releasing force applied by the prestressing spring, and a second elastic member for aiding closing of the circuit and prestressed by the prestressing spring, and the device for opening the circuit includes a third elastic member for opening the circuit by opening the make-break contact with a releasing force and a fourth elastic member for aiding opening of the circuit, aiding the releasing force of the third elastic member. Disclosure of Invention.

The circuit breaker may be affected by impact vibration during switch operation, and vibration due to installation conditions when holding the closing. In a circuit breaker that maintains a closing state by a latch mechanism, there is a problem that the latch oscillates due to the vibration, the latch engaging part is disengaged, and an unnecessary opening is reached.

The present application discloses a technique made in view of the above circumstances, and it is an object of the present invention to obtain a structure not easily affected by vibration and being able to stabilize the closing operation and the closing holding.

The circuit breaker disclosed in this application is equipped with a fixed contact, a traveling contact connected to and separated from the fixed contact, a rod-shaped latch that is rotatably pivotally supported in the barycentric region between one end having a latch engaging part and the other end driven by tripping, an insulating rod having a latch pin at one end that engages with the latch engaging part, an input actuator that drives the other end of the insulating rod, and a spring for opening that drives the traveling contact in the opening direction,.

When the other end of the latch is pulled off and driven while the traveling contact is closed to the fixed contact, the engagement between the latch engaging part and the latch pin is disengaged, and the traveling contact is driven in the opening direction by the opening spring.

When the latch pin is driven in the input direction by the input actuator via the insulating rod in a state where the traveling contact is open, the latch is driven in the input direction via the latch engaging part, and the traveling contact is driven in the opening direction with the fixed contact.

According to the circuit breaker disclosed in the present application, it is not easily affected by the vibration of the circuit breaker, it is possible to stabilize the closing operation and the closing holding.

Hereinafter, each embodiment of the present application will be described with reference to the drawings as an example of application to a DC circuit breaker.

In the drawings, the same reference numerals indicate the same or corresponding parts.

<FIG> explain the structure of the operation mechanism of the circuit breaker in the first embodiment of the present application, <FIG> shows the structure of the operation mechanism of the circuit breaker, <FIG> shows the opening state of the circuit breaker, which is mainly the operation mechanism, <FIG> shows the closing state of mainly the circuit breaker of the operating mechanism, <FIG> shows the excitation state of the input actuator in the opening state due to the release of the latch engaging part of the operation mechanism of the circuit breaker, <FIG> shows the connection between the input driving rod and the insulation rod of the circuit breaker, which is mainly the operation mechanism, <FIG> and <FIG> show the connection between the traveling terminal of the operation mechanism and the opening spring unit of the circuit breaker, <FIG> and <FIG> show mainly the insulating rod and latch engaging part of the operating mechanism of the circuit breaker.

As shown in <FIG>, the circuit breaker has a traveling terminal <NUM>, a first fixed terminal <NUM>, and a second fixed terminal <NUM> provided below the first fixed terminal <NUM>. The second fixed terminal <NUM> is connected to the traveling terminal <NUM> via a flexible shunt <NUM>.

Various driving mechanisms including a closing drive mechanism are attached to a mechanical frame <NUM> fixed in the circuit breaker. The closing driving mechanism is connected to an insulating rod <NUM>, and the insulating rod <NUM> is moved (to be exact, pivoted) in the left-right direction of <FIG> by an input actuator <NUM>.

A part of an opening driving mechanism having a spring rod <NUM> for opening, a spring <NUM> for opening, and a spring guide <NUM> for opening is connected to the traveling terminal <NUM>. The opening driving mechanism is composed of a spring rod <NUM>, a spring <NUM>, a spring guide <NUM>, and the traveling terminal <NUM>.

The traveling terminal <NUM> is provided with a traveling contact 1a at one end thereof, and the other end is connected to the mechanical frame <NUM>. Further, a rod-shaped latch <NUM> as shown in the figure is rotatably attached to the traveling terminal <NUM> with a traveling connecting pin S3 as a support.

An engaging part 11a is provided at one end of the latch <NUM>, and the latch engaging part 11a engages with the latch pin S1 provided on the insulating rod <NUM>. The tripping part is provided at the other end of the latch <NUM>, and the tripping part of the latch <NUM> is pushed by a latch tripping mechanism, rotating the latch <NUM>. In this embodiment, the engagement between the latch engaging part 11a and the latch pin S1 is shown, and for example, any other material such as an edge part of a component other than the pin may be used as long as the latch can be engaged and disengaged. Further, the engaging part may be provided on the insulating rod and the pin may be provided on the latch.

In this way, by providing an engaging part on one side of the latch <NUM> and a tripping part on the other side via the rotation axis of the latch <NUM>, the latch <NUM> is provided with an engaging part and a tripping part on the other side, the center of gravity of the latch is not biased to one side, and it is less susceptible to vibration, and the operation in closing can be stabilized. Further, when the installation location is affected by vibration, the influence of vibration can be reduced even when the closing is held. The rotation axis of the latch <NUM> is preferably provided near the center of gravity of the latch <NUM>, and more preferably provided in accordance with the center of gravity. In other words, the rotation center of the latch <NUM> is located in the center of gravity region of the rod-shaped latch <NUM>, further, by providing an engaging part at one end of the latch <NUM> and a tripping part at the other end, the latch <NUM> is provided, the center of gravity of the latch is not significantly biased to one of the rod-shaped latches <NUM>, it is less likely to be affected by vibration, and stable engagement between the latch <NUM> and the latch pin S1 can be ensured.

Further, the circuit breaker has an auxiliary switch driving mechanism. The auxiliary switch drive mechanism is composed of a driving rod <NUM> for auxiliary switch, a spring guide <NUM> for driving auxiliary switch, and a link <NUM> for driving an auxiliary switch, the link <NUM> is attached to the mechanical frame <NUM>.

The operation mechanism of the circuit breaker consists of a closing driving mechanism, an opening driving mechanism, a latch mechanism connecting them, and an auxiliary switch drive mechanism, the detailed structure of each mechanism will be sequentially described below with reference to <FIG> together with the input actuator that urges the opening direction.

First, the input actuator will be described.

As shown in <FIG>, the input actuator <NUM> is equipped with a driving rod 7a for input, a return spring 7b for returning the driving rod 7a, and an input coil 7c. At the time of closing, the driving rod 7a moves horizontally to the right in <FIG> and the return spring 7b is stored by the excitation of the input coil 7c. At the time of opening, the return spring 7b is released by the demagnetization of the input coil 7c, and the driving rod 7a horizontally moves to the left in <FIG> and is in the reset state.

Next, the closing driving mechanism will be described.

The closing driving mechanism is composed by an insulation rod <NUM>, the latch pin S1 provided on the insulating rod <NUM>, one end is rotatably attached to the latch pin S1, a link <NUM> for closing driving, the other end of which is pivotally supported with a fixing pin P2 as the center of rotation, a spring receiving pin 16a provided on the link <NUM>, a return spring <NUM> for returning the closing driving link <NUM> to return the closing driving link <NUM>, and the fixing pin P2 fixed to the mechanical frame <NUM>, these members are mounted on the mechanical frame <NUM> as follows.

One end of the closing driving link <NUM> is rotatably supported by the mechanical frame <NUM> by the fixing pin P2, an insulating rod <NUM> is supported by the latch pin S1 on the link <NUM>. Further, the link return spring <NUM> composed of the twist spring for the closing driving link return uses the fixing pin P2 as the support shaft, one of the arms is arranged so as to hang on a fixing pin P5, and the other arm is hung on the spring receiving pin 16a provided on the link <NUM>, the closing driving link <NUM> is always urged counterclockwise.

Further, as shown in <FIG>, the other end of the insulating rod <NUM> connected to the closing driving link <NUM> is as shown in Fig, it is connected to the driving rod 7a via a connecting hole 6b formed in the insulating rod <NUM>. Returning to <FIG>, the tip of the driving rod 7a pushes the pushing surface 6a of the insulating rod formed on the insulating rod <NUM>, the latch pin S1 connected to the insulating rod <NUM> moves in an arc with the fixing pin P2 as the axis of rotation.

Next, the opening driving mechanism and the latch mechanism will be described.

The opening driving mechanism is composed of a traveling terminal <NUM> composed of a traveling contactor 1b on which a traveling contact 1a is formed and an opening driving link 1c, a shunt <NUM>, a fixing pin P1 and an opening spring unit.

Here, a traveling contact 1a that is in contact with and separated from the fixed contact 2a is formed at one end of the traveling contactor 1b.

The opening spring unit includes a spring rod <NUM> for opening, a spring <NUM> for opening, a spring guide <NUM> for opening, a traveling connecting pin S2 for opening, and a retaining pin S7.

The spring guide <NUM> is fixed in the circuit breaker.

Further, the latch mechanism is composed of a latch <NUM>, the traveling connecting pin S3, and a latch return spring <NUM>, these members are mounted on the mechanical frame <NUM> as follows.

At the other end of the traveling terminal <NUM> where one end is rotatably supported by the mechanical frame <NUM> by the fixing pin P1, a spring rod <NUM> for opening constituting the opening spring unit is pivotally supported by the traveling connecting pin S2 for opening.

As shown in <FIG>, the traveling connecting pin S2 is prevented from being pulled out, this is done by inserting the retaining pin S7 into a pin hole <NUM> of the blind hole provided in the opening driving link 1c, and attaching the traveling contactor 1b so as to cover it.

As shown in <FIG>, when viewed from the fixed contact 2a, the traveling contactor 1b and the opening driving link 1c are formed to have the same width, the diameter of the spring rod <NUM> for opening is also configured to be the same as the width of the traveling terminal <NUM>. Further, the opening spring rod <NUM> is supported by the opening spring guide <NUM> so as to be freely movable in the vertical direction to some extent.

To secure the space for arranging arc behavior control parts when cutting off the circuit short-circuit current, it is preferable to configure the vicinity of the traveling contact in the operation mechanism in a small space, in the circuit breaker of this embodiment, the traveling connecting pin S2 for opening for axially supporting the spring rod <NUM> to the traveling terminal <NUM> is provided with a structure inserted into the stopper pin through hole 1d formed in the traveling terminal <NUM> in the direction orthogonal to the opening/closing movement direction of the contact, the traveling connecting pin S2 is configured so as not to protrude from the stopper pin through hole 1d of the traveling terminal <NUM> in the orthogonal direction, that is, in the width direction of the traveling terminal <NUM>. Therefore, the vicinity of the traveling contact in the operation mechanism can be configured in a space-saving manner.

One end and the inner diameter of the spring <NUM> are supported by the spring rod <NUM>, and the other end of the spring <NUM> is regulated by the spring guide <NUM>. As described above, the spring <NUM> is provided so as to be expandable and contractible according to the operation of the spring rod <NUM> due to the arc movement of the traveling terminal <NUM>. The traveling terminal <NUM> is always urged counterclockwise by this opening spring force, and the opening position is regulated by a stopper pin P3.

The latch mechanism includes the latch <NUM>, the latch return spring <NUM>, and the traveling connecting pin S3, and these members are mounted on the traveling terminal <NUM> as follows.

The latch <NUM> is rotatably supported by the traveling connecting pin S3 in a state of penetrating the latch through hole 1e of the traveling terminal <NUM>. The latch <NUM> is composed of the latch engaging part 11a at one end and a latch pushing part 11b at the other end of the rotation shaft, as shown in <FIG> and <FIG>, the latch engaging part 11a is engaged with the latch pin S1 with the insulating rod <NUM> covering the upper surface and the side surface with a cover.

Further, the latch return spring <NUM> of the twist spring is arranged so that one arm is hooked on the traveling terminal <NUM> and the other arm is hooked on the latch <NUM> with the traveling connecting pin S3 as a support shaft, the latch <NUM> is always urged clockwise.

If metal-based scattered matter generated when the current is cut off accumulates on the latch engagement part, engagement failure may occur, in the circuit breaker of this embodiment, the latch engaging part (the part that engages with the latch pin S1) is not located directly below the arc generation location (contact/detachment position), since it is provided at a position away from the position directly below, it is possible to suppress poor engagement. Further, since the upper surface or the side surface of the latch engaging part is covered with a cover or the like, the possibility of poor engagement can be further reduced.

The traveling connecting pin S3 moves in an arc with the fixed pin P1 that pivotally supports the traveling terminal <NUM> as a rotation axis. This arc radius r1 (corresponding to the distance between the fixed pin P1 and the traveling connecting pin S3) is equivalent to the arc traveling radius r2 (corresponding to the distance between the fixed pin P2 and the latch pin S1) of the latch pin S1 constituting the closing driving mechanism.

A parallel crank mechanism is formed by a link <NUM> of a closing driving mechanism connected via a latch pin S1 and the traveling connecting pin S3, a link 1c of an opening driving mechanism, and a latch <NUM> of a latch mechanism. The relationship between r1 and r2 may be r1 = r2 or r1≈r2.

Next, the auxiliary switch driving mechanism will be described.

The auxiliary switch driving mechanism includes Link <NUM> for driving the auxiliary switch, the rod <NUM> for driving the auxiliary switch, the spring guide <NUM> for driving the auxiliary switch, a spring <NUM> for driving the auxiliary switch, a traveling connecting pin S4, a traveling connecting pin S5, a traveling connecting pin S6, a fixing pin P4, these members are mounted on the mechanical frame <NUM> as follows.

The mechanical frame <NUM> is provided with a fixing pin P1 that pivotally supports the traveling terminal <NUM>. The link <NUM> is rotatably provided on the fixing pin P1. The driving rod <NUM> is pivotally supported by the traveling connecting pin S5 formed on the link <NUM>.

Further, the driving rod <NUM> is supported by the fixing pin P4 provided in an elongated hole formed in the drive rod <NUM>, and moves in the horizontal direction in conjunction with the operation of the link <NUM>. Further, the spring guide <NUM> is connected to the driving rod <NUM> by the traveling connecting pin S6. That is, the spring guide <NUM> is connected to the traveling connecting pin S6 formed on the driving rod <NUM>. With the driving rod <NUM> as the inner diameter support shaft, the spring <NUM> is flexibly provided according to the horizontal movement of the driving rod <NUM> in a state where one end is restricted by the fixing pin P4 and the other end is restricted by the spring guide <NUM>.

The driving rod <NUM> is always urged to the left by the spring <NUM>, and the link <NUM> is always urged clockwise with the fixing pin P1 as the axis of rotation via the traveling connecting pin S5. In the opening state, the traveling connecting pin S4 provided on the link <NUM> comes into contact with the traveling terminal <NUM>, so that clockwise rotation is restricted.

The opening/closing operation by the excitation and demagnetization of the input actuator <NUM> will be described with reference to <FIG> and <FIG>.

The load of the main configuration spring is in the relationship of the opening spring <NUM>> the spring for driving auxiliary switch <NUM>, and the spring load of each return spring is smaller than these spring loads.

<FIG> shows the input coil 7c in the demagnetized state and the operating mechanism in the opening state, and the closing operation will be described first from this state.

When the input coil 7c is excited, the driving rod 7a moves horizontally to the right in <FIG>, and the return spring 7b for returning the driving rod is stored. At this time, the driving rod 7a pushes the pushing surface 6a of the insulating rod <NUM>, and the insulating rod <NUM> moves to the right. Along with the movement of the insulating rod <NUM>, the link <NUM> connected to the latch pin S1 moves in a clockwise arc with the fixing pin P2 as the center of rotation while accumulating the return spring <NUM>. During the traveling process, the latch pin S1 engages with the latch engaging part 11a of the latch <NUM> and urges the latch <NUM> to the right.

At this time, the traveling connecting pin S3 that pivotally supports the latch <NUM> has the fixing pin P1 as the center of rotation, by moving in an arc clockwise with the traveling terminal <NUM>, the traveling contact 1a formed on the traveling contactor 1b constituting the traveling terminal <NUM> comes into contact with the fixed contact 2a of the first fixed terminal <NUM>.

Further, the spring <NUM> for opening is stored by the spring rod <NUM> that follows the traveling of the traveling terminal <NUM>, the traveling terminal <NUM> is urged counterclockwise, but the closing state shown in <FIG> is maintained while the input actuator <NUM> is excited. In such a closed state, an electric path is formed from the first fixed terminal <NUM> to the second fixed terminal <NUM> via the traveling contactor 1b and the shunt <NUM> of a copper-based material that carries electricity.

In the closing process, the link <NUM> for driving the auxiliary switch pivotally supported by the fixed pin P1 moves in a clockwise arc with the fixed pin P1 as the center of rotation. At this time, the driving rod <NUM> connected via the traveling connecting pin S5 is driven by the spring force of the spring <NUM> for driving the auxiliary switch moves to the left until the end of the slotted hole provided in the link <NUM> for driving the auxiliary switch comes into contact with the fixing pin P5, an auxiliary switch <NUM> is operated at the tip part.

In the closing state of <FIG>, a gap <NUM> is provided between the traveling connecting pin S4 and the traveling terminal <NUM> so that the traveling connecting pin S4 does not come into contact with the traveling terminal <NUM>.

In other words, in the process of operating the traveling terminal <NUM> to closing, the traveling connecting pin S4 of the link <NUM> is regulated by the traveling terminal <NUM>, and the traveling amount of the link <NUM> is regulated, in the completed state of the operation of the traveling terminal <NUM> to the closing, a gap <NUM> is generated between the traveling connecting pin S4 and the traveling terminal <NUM>, and the regulation is released.

Next, the opening operation by demagnetizing the input coil 7c will be described.

When the input coil 7c is demagnetized from the closing state shown in <FIG>, the return spring 7b is released and the driving rod 7a moves to the left in <FIG>. At this time, since the force with which the driving rod 7a pushes the pushing surface 6a of the insulating rod <NUM> disappears, the return spring <NUM> is released, the closing driving link <NUM> having the insulating rod <NUM> and the latch pin S1 moves in an arc counterclockwise with the fixing pin P2 as the axis of rotation.

As a result, the force pushing the latch engaging part 11a of the latch pin S1 disappears, and the opening spring <NUM> is released, the traveling terminal <NUM> having the latch <NUM> moves in an arc counterclockwise with the fixing pin P1 as the axis of rotation.

In the process of opening, the traveling terminal <NUM> and the traveling connecting pin S4 come into contact with each other, and the link <NUM> having the traveling connecting pin S4 moves in an arc counterclockwise with the fixing pin P1 as the axis of rotation due to the release force of the spring <NUM>. At this time, the driving rod <NUM> horizontally moves to the right in <FIG> via the traveling connecting pin S5 to reset the auxiliary switch <NUM> and store the spring <NUM>. The traveling terminal <NUM> stops when it comes into contact with the stopper pin P3, and maintains the opening state of <FIG> by the initial load of the opening spring <NUM>.

Next, the opening operation by disengaging the latch engagement in the tripping device from the closing state will be described with reference to <FIG> and <FIG>.

<FIG> shows the traveling terminal <NUM> in the opening state and the input coil 7c in the excited state due to the release of the latch engagement in the tripping device.

In the closing state of <FIG>, a tripping device <NUM> that has detected the circuit short-circuit current operates upward and pushes the latch pushing part 11b to rotate the latch <NUM> counterclockwise.

When the latch <NUM> rotates, the engagement between the latch engaging part 11a and the latch pin S1 is released, and the traveling terminal <NUM> shifts to the opening state while the input coil 7c is maintained in the excited state.

In the process of opening of the traveling terminal <NUM> or after opening, the input actuator <NUM> shifts to the reset state and the link <NUM> for closing also shifts to the reset state by releasing the excitation of the input coil 7c.

The latch <NUM> is returned counterclockwise by the latch return spring <NUM>, and is in the opening state shown in <FIG>.

The operation description of the auxiliary switch driving mechanism in the main opening operation is the same as the opening operation by demagnetization of the input coil 7c, and is omitted because it has already been explained.

As described above, according to the operation mechanism of the circuit breaker of the first embodiment, one end is a latch engaging part and the other end is a pushing part for disengaging the latch rotation shaft, by arranging the position of the center of gravity of the latch near the center of rotation of the latch, it is less susceptible to vibration during circuit breaker operation and vibration in the installed state, it is possible to stabilize the closing operation and the closing holding.

In addition, by keeping the latch engagement part away from the bottom of the contact part and covering it, it is possible to avoid the adhesion of metal-based scattered matter when the current is cut off, it is possible to stabilize the closing operation and the closing holding, and to stabilize the latch release force at the time of opening.

Further, by forming the closing driving mechanism, the opening driving mechanism and the latch mechanism by the parallel crank mechanism, it is possible to suppress the amount of slippage of the latch engaging surface with respect to the latch pin in the closing process, engagement failure due to slippage of the latch engaging surface can be suppressed, and the closing operation and closing holding can be stabilized.

In addition, in order to efficiently use the spring energy of the opening spring in the opening driving mechanism, by arranging the opening spring near the main contact part away from the center of rotation of the traveling terminal, it is possible to reduce the load on the opening spring, and further by separating the traveling terminal configuration into a copper-based material that is responsible for energization and an iron-based material that is responsible for rigidity, the wall thickness of the components can be reduced, and the opening time can be shortened by reducing the size and weight.

Further, by keeping the space within the main contact width without using a retaining ring for the connecting part of the opening spring unit, it is possible to secure a space for arranging the arc behavior control component at the time of current interruption.

Further, the traveling terminal and the auxiliary switch driving link are separated in the process of closing, and a gap is provided between both parts when closing, high-speed opening operation is possible without hindering the movement of the traveling terminal in the initial process of opening in the short-circuit current cutoff.

In addition, by connecting the input actuator and the insulating rod of the closing driving mechanism only in the opening direction, it is possible to reduce the transmission of the release energy of the contact pressure released from the input actuator at the time of opening to the closing driving mechanism and the opening driving mechanism, the components can be made thinner and smaller.

The second embodiment of the present invention will be described below with reference to <FIG>. In the second embodiment of the present application, the description of the same or corresponding part as that of the first embodiment will be omitted, and the parts different from the first embodiment will be mainly described below.

In the first embodiment, special part to drive the auxiliary switch were needed, as the link <NUM> for driving the auxiliary switch to turn on / off the auxiliary switch <NUM>, the drive rod <NUM> for driving the auxiliary switch, the auxiliary switch drive spring <NUM>, but in the second embodiment, the auxiliary switch <NUM> is driven by the opening spring rod <NUM>.

With such a configuration, the above-mentioned parts required in the first embodiment become unnecessary, and the number of parts can be reduced.

In the first and second embodiments described above, the circuit breaker having a structure in which the traveling terminal rotates has been described, but the opening/closing mechanism is not limited to this structure, for example, it may be a circuit breaker having a structure in which the traveling terminal moves linearly in the horizontal direction.

Further, in the third embodiment of the present application, the description of the same or corresponding part as that of the first and second embodiments will be omitted, and the parts different from the first and second embodiments will be mainly described below.

<FIG>, <FIG> and <FIG> are diagrams showing the circuit breaker of the third embodiment.

<FIG> shows the circuit breaker opening state, <FIG> shows the closing state, and <FIG> shows the circuit breaker opening state and the input actuator excitation state by releasing the latch by the tripping device.

In <FIG>, <FIG> and <FIG>, the traveling terminal has a traveling contactor 1b, the traveling contact 1a and an opening driving link 1c, the traveling contactor 1b is connected to the second fixed terminal <NUM> via the shunt <NUM>.

In the opening state shown in <FIG>, the engaging part of the latch <NUM> is located in a state where a slight gap is provided with respect to the latch pin S1 provided on the insulating rod <NUM>.

At the time of transition from the opening state shown in <FIG> to the closing state shown in <FIG>, the insulating rod <NUM> is horizontally moved to the right by the excitation of the input actuator <NUM>. In the process of this horizontal traveling, the latch pin S1 provided on the insulating rod <NUM> engages with the latch <NUM> pivotally supported by the pin S3 on the traveling contactor 1b, the insulating rod <NUM> and the traveling contactor 1b move horizontally to the right. At the same time, the spring rod <NUM> connected to the opening driving link 1c by the pin S2 also moves in the same direction, the spring rod <NUM> stores the spring <NUM> for opening.

By moving the traveling contactor 1b in the horizontal direction in this way, the traveling contact 1a comes into contact with the fixed contact 2a of the first fixed terminal <NUM>, resulting in the closing state as shown in <FIG>.

Further, the auxiliary switch <NUM> is driven by the movement of the spring rod <NUM>.

On the other hand, the spring <NUM> is released by the demagnetization of the input actuator <NUM>, and the traveling contactor 1b moves horizontally to the left in <FIG>, the opening driving link 1c comes into contact with the stopper pin P3, resulting in the opening state as shown in <FIG>.

Further, in the case that the latch <NUM> and the latch pin S1 are disengaged from each other to opening, the tripping device <NUM> is driven, by pushing the latch and rotating the latch counterclockwise, the latch engagement is released, the spring <NUM> is released, and while the input actuator <NUM> keeps the excited state, the traveling contactor 1b and the fixed contact 2a are separated from each other, resulting in the opening state as shown in <FIG>.

After the opening state of <FIG> or in the opening process, the input actuator <NUM> is demagnetized, resulting in the opening state as shown in <FIG>.

Claim 1:
A circuit breaker comprising:
a fixed contact (2a), a traveling contact (1a) connected to and separated from the fixed contact,
characterised by further comprising a rod-shaped latch (<NUM>) that is rotatably pivotally supported in the barycentric region between one end having a latch engaging part (11a) and the other end driven by tripping, an insulating rod (<NUM>) having a latch pin (S1) at one end that engages with the latch engaging part (11a), an input actuator (<NUM>) that drives the other end of the insulating rod (<NUM>), and a spring (<NUM>) for opening that drives the traveling contact (1a) in the opening direction, wherein;
when the other end of the latch (<NUM>) is pulled off and driven while the traveling contact (1a) is closed to the fixed contact(2a) , the engagement between the latch engaging part (11a) and the latch pin (S1) is disengaged, and the traveling contact (1a) is driven in the opening direction by the opening spring (<NUM>),
when the latch pin (S1) is driven in the input direction by the input actuator (<NUM>) via the insulating rod (<NUM>) in a state where the traveling contact (1a) is open, the latch (<NUM>) is driven in the input direction via the latch engaging part (11a), and the traveling contact (1a) is driven in the closing direction with the fixed contact (2a).