KR200411539Y1 - Vaccum circuit breaker - Google Patents

Abstract

The present invention provides a vacuum circuit breaker capable of restraining the state by the key lock mechanism only in the blocking state and preventing tripping operation by the key lock mechanism in the closing state. It is intended to provide a vacuum circuit breaker that can be blocked driving the input coil in the state to prevent over-excited burnout of the input coil, is fixed to the open shaft lever can be rotated with the open shaft lever, in the input state A closing lock cam positioned at a position for stopping the rotation of the open lock lever; A stop action portion provided in the open lock lever so as to protrude on the rotation path of the input lock cam, wherein the rotation is stopped by the input lock cam in the input state; A switch installed on a rotation path of the open lock lever, installed on a power supply path between the input coils from a power source on an electrical circuit, and switched by a rotating open lock lever to cut off power supply to the input coils It is provided with a vacuum circuit breaker comprising a.

Vacuum Circuit Breaker, Key Lock Mechanism, Lockout Condition, Prevent Malfunction

Description

Vacuum Circuit Breaker {VACCUM CIRCUIT BREAKER}

1 is an internal front view showing a main portion including a key lock mechanism of a vacuum circuit breaker according to the prior art;

2A and 2B are a front view and a rear side perspective view, respectively, of a main portion including a key lock mechanism of a vacuum circuit breaker according to the prior art;

Figure 3 is an exploded perspective view of the key lock mechanism of the vacuum circuit breaker according to the prior art.

Figure 4 is a perspective view of the open lock lever of the vacuum circuit breaker according to the prior art.

5A and 5B are views for explaining an operation of restraining by a key lock mechanism by a key lock mechanism in a vacuum circuit breaker according to the prior art, and FIG. 5A is an operation state diagram showing a state where the key lock mechanism is not in a restrained position. 5B is an operational state diagram showing a state in which the key lock mechanism is operated to the restraint position.

Figure 6 is a perspective view showing the configuration of the key lock holder and its supporting plate which is part of the key lock mechanism in the vacuum circuit breaker according to an embodiment of the present invention.

Figure 7 is a perspective view of the open lock cam in the vacuum circuit breaker according to an embodiment of the present invention.

Figure 8 is a perspective view of the open lock lever in the vacuum circuit breaker according to an embodiment of the present invention.

Figure 9 is a front view of the inner main portion of the vacuum circuit breaker for explaining the configuration and operation of the vacuum circuit breaker according to an embodiment of the present invention.

Figure 10 is a front view of the inner main portion for explaining the configuration and operation of the switch for preventing over-excitation of the input coil in the vacuum circuit breaker according to an embodiment of the present invention.

FIG. 11 is an enlarged view of a portion of the switch and key lock mechanism of FIG. 10 in an enlarged manner; FIG.

12 is a circuit diagram of an input coil and a micro switch of a vacuum circuit breaker according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: closing latch lever

11: closing coil 12: trip coil

13: power transmission mechanism 10a: roller

15: opening lock cam

20: opening lock lever 23: stopper section

30: key lock mechanism 31: key

33: key lock 34: lock bolt hole

35: key lock holder 36: side opening

37: lock bolt 39: support plate

40: trip latch C / S: closing spring

T / S: trip spring M / S: micro switch

The present invention relates to a vacuum circuit breaker, and more particularly, to prevent the vacuum circuit breaker from being operated in a tripped state by the key lock device in the closed state, and to operate the input coil in a state in which the key lock device is restricted from the blocking state. The present invention relates to a vacuum circuit breaker that can prevent excessive excitation of the input coil.

The high voltage circuit breaker functions as a main circuit breaker that cuts off and supplies various loads such as motors and capacitors in the distribution line system. These high voltage circuit breakers may cause burnout or blackout due to insulation breakdown, phase short, contact deterioration, etc.In order to prevent accidents and operate them stably, periodic maintenance checks are conducted to check for abnormalities. Should be.

In addition, if the breaker is interrupted while the breaker is connected to the main board of the switchboard, and the circuit breaker is inadvertently operated by the third party while checking the load on the switchboard equipment and the lower part of the switchboard, accidents may occur due to the electric shock of the inspector. have.

In order to prevent such electric accidents, the breaker mechanism is equipped with a lock device that operates as a key so that the breaker does not enter or break even if a person other than the person in charge of the electric officer or an unintentional operation mistake is made. And switchboards.

Hereinafter, a structure and an operation of a conventional vacuum circuit breaker will be described with reference to the accompanying drawings.

1 is an internal front view showing a main part including a key lock mechanism of a vacuum circuit breaker according to the prior art, and FIGS. 2A and 2B are respectively a perspective view of the main part including a key lock mechanism of a vacuum circuit breaker according to the prior art as viewed from the front side; And a perspective view seen from the rear side.

The closing and closing operations of the vacuum circuit breaker will be described with reference to these drawings. The moving core inside the closing coil 11 excited by manually rotating the closing lever 10 or applying power to the closing coil 11 ( Rotating the closing latch lever 10 while the moving core (not shown) pops up and strikes the closing latch lever 10, and the power transmission mechanism including a crank shaft and a link. The restraint of the closing latch lever 10 with respect to 13 is released, and the closing spring (not shown) prevails the elastic energy through the driving lever and the power transmission mechanism 13 so that the closing operation of the vacuum circuit breaker is performed.

On the other hand, when the vacuum breaker is to be shut off, the open lock lever 20 is manually rotated or a trip signal is applied to excite the trip coil 12, and the moving core inside the excited trip coil 12 bounces upward. Rotating the trip latch 40 while hitting the trip latch 40 and the release latch releases the restraint of the trip latch 40 to the power transmission mechanism 13 including the link, thereby driving the drive lever and the drive lever. A tripping spring (not shown) prevails the elastic energy through the power transmission mechanism 13 to trip the vacuum circuit breaker.

On the other hand, the vacuum circuit breaker is provided with a key lock mechanism 30 for restraining it in a blocked state, the key lock mechanism 30 is a key (key; 31), key lock (33), key lock A key lock holder 35 and the like, and the key lock mechanism 30 prevents the blocking state of the vacuum circuit breaker by restraining the rotation of the input latch lever 10.

In FIG. 1, FIG. 2A, and FIG. 2B, the reference numeral 10a is a roller which is rotatably installed at the distal end of the closing latch lever 10 to reduce the frictional impact with the power transmission mechanism 13.

This key lock mechanism 30 and the open lock lever 20 are installed on the support frame 1.

Figure 3 is an exploded perspective view of the key lock mechanism of the vacuum circuit breaker according to the prior art, Figure 4 is a perspective view of the open lock lever of the vacuum circuit breaker according to the prior art.

Referring to Figs. 3 and 4, the conventional key lock mechanism 30 and the open lock lever 20 will be described. As shown in Fig. 3, the key 31 is inserted into the key lock 33 and rotated. It is installed as possible, the key lock 33 is formed with a lock bolt hole (34) in which the lock bolt 37 is inserted and fixed, the key lock 33 is inserted into the key lock holder 35 And rotatably installed. At this time, the side lock portion 36 is also formed in the key lock holder 35 at a position corresponding to the lock bolt hole 34 of the key lock 33.

In addition, as shown in FIG. 4, a mounting hole 21 for mounting to the support frame 1 is formed in the opening lock lever 20, and the opening lock lever 20 is provided with a pin () in the mounting hole 21. It is installed so as to rotate by inserting.

A restraining operation and a releasing operation by the key lock mechanism in the vacuum circuit breaker configured as described above will be described with reference to FIGS. 5A and 5B.

5A is a view for explaining a state in which a breaker is restrained by a conventional key lock mechanism, and FIG. 5B is a view for explaining a restraint operation of a conventional key lock mechanism. Will be explained first. The same components as those in Figs. 1 to 4 are assigned the same reference numerals.

In the restraining operation of the key lock device 30, when the key is turned clockwise, the lock bolt 37 is pushed to the right while pushing the open lock lever 20, and the open lock lever 20 rotates. At this time, the upper end of the open lock lever 20 supports the closing latch lever 10 to prevent rotation of the closing latch lever 10, and the lower end of the opening lock lever 20 is a pin welded to the trip latch 40. While pushing in the left direction to rotate the trip latch 40 to the release position to block the breaker.

As such, when the state of the vacuum circuit breaker is restricted by the key lock mechanism, it is impossible to operate the battery without the key.

On the other hand, when attempting to input the vacuum circuit breaker constrained by the key lock device 30, first, the restraint of the key lock device 30 must be released, which will be described with reference to FIG.

When the user turns the key 31 counterclockwise, the lock bolt 37 moves (retracts) to the left in the drawing, and the open lock lever 20 also returns to its original position. Then, the closing latch lever 10, which is caught on the upper end of the open lock lever 20 and cannot rotate, is brought into a state in which the rotating latch can be rotated again. In this state, the breaker is manually or electrically operated.

However, the vacuum circuit breaker by the conventional key lock mechanism operating as described above has the following problems.

That is, even though the key lock mechanism must be operated to restrain the shut-off state only when the vacuum breaker is in the shut-off state, it is possible to operate the key to the restraint position in the put-in state. In this case, when the circuit is unnecessarily disconnected and reinserted, the key must be returned to its original position (released position) and then the closing operation is troublesome.

In addition, since the electrical circuit for the key lock mechanism is not configured, when the closing of the vacuum circuit breaker is restricted by the key lock mechanism, the mechanical interlock is engaged and the input signal is electrically applied even though the closing operation is not performed. There is a problem that the input coil is overexcited and burned out.

Therefore, the present invention is devised to solve the above problems, the object of the present invention, the blocking state is constrained by the key lock mechanism only in the blocking state, in the closing state is operated in the trip state by the key lock mechanism It is to provide a vacuum circuit breaker that is prevented.

Another object of the present invention is to provide a vacuum circuit breaker which can prevent the burnout caused by over-excitation of the input coil by blocking the input circuit when the vacuum circuit breaker is restricted by the key lock mechanism.

An object of the present invention as described above, the input spring for storing the elastic energy for the closing operation and the stored elastic energy during the charging operation, and the constraint that the closing spring to maintain the elastic energy for the closing operation A closing latch lever rotatable to a release position for releasing the elastic energy to prevail in position and closing operation, an closing coil for rotationally driving the closing latch lever to a release position for closing operation when power is supplied; A trip spring for storing the elastic energy for the trip operation and preserving the elastic energy for the trip operation; and releasing the tripping spring to restrain the restraint position and the elastic energy to maintain the elastic energy for the trip condition A trip latch that can be rotated to the release position, and the release latch to the release position for a trip operation A trip coil for rotationally driving the trip latch, and an opening shaft lever rotatable by the presumptive elastic energy as part of a power transmission mechanism for power transmitting the presumptive elastic energy of the input spring and the trip spring. In the vacuum breaker,

A key lock rotatable in accordance with the rotation of the key;

A lock bolt connected to a side of the key lock and movable back and forth according to the rotation of the key lock;

A key lock holder having a side opening for permitting movement of the lock bolt and rotatably supporting the key lock and fixed to a front operation portion of the vacuum circuit breaker; It is installed in a position where it can be rotated by the pressurization of the lock bolt inside the vacuum breaker, and the upper part stops the rotation to the release position of the closing latch lever by the pressurization of the advance lock bolt and the lower part releases the trip latch. An opening lock lever rotatable to a releasing position;

A closing lock cam fixed to the open shaft lever and rotatable with the open shaft lever, the closing lock cam being positioned at a position for stopping the rotation of the open lock lever in a closed state;

And a stop action part provided on the open lock lever to protrude on a rotation path of the input lock cam, the rotational action being stopped by the input lock cam in a closed state. Can be achieved by providing

Another object of the present invention is an injection spring for accumulating the elastic energy for the closing operation and the stored elastic energy during the closing operation, and the restrained position to keep the elastic energy for the closing operation in the compressed state; A closing latch lever rotatable to a release position for releasing elastic energy during the closing operation, an closing coil for rotationally driving the closing latch lever to the release position when power is supplied, and an elasticity for a trip operation A trip spring for accumulating energy and preserving the elastic energy accumulated during the trip operation, a tripping position capable of rotating the trip spring to a restraint position for maintaining the elastic energy for the trip in a condensed state and a release position for releasing the elastic energy Latch and a trip for rotating the trip latch to the release position when supplying power. The coil and the closing spring, and a vacuum breaker having a rotatable opening lever shaft (opening lever shaft) by whether the rent acoustic energy as a part of a power transmission mechanism for transmitting power to rent the elastic energy of the trip spring,

A key lock rotatable according to the rotation of the key;

A lock bolt connected to a side of the key lock and movable back and forth according to the rotation of the key lock;

A key lock holder having a side opening for permitting movement of the lock bolt and rotatably supporting the key lock and fixed to a front operation portion of the vacuum circuit breaker;

It is installed at the position which can be rotated by the pressurization of the said lock bolt in a vacuum circuit breaker, The upper part restrains rotation to the release position of the said input latch lever by the pressurization of the said advance lock bolt, and the lower part releases the trip latch. An opening lock lever rotatable to a position;

It is installed on the rotation path of the open lock lever, is installed on the power supply path between the power supply coil from the power source on the electrical circuit, switching drive by the rotating open lock lever can cut off the power supply to the input coil It can be achieved by providing a vacuum circuit breaker according to the present invention, characterized in that it comprises a switch; and.

The object of the present invention and the configuration of the present invention to achieve the same will be more clearly understood by the following description of an embodiment of the present invention with reference to the accompanying drawings.

In the present invention and the prior art, the same reference numerals are given to the components corresponding to each other to facilitate the contrast of the mutual configuration and the effect. In addition, the parts that are not the same as the prior art have been described with reference to the prior art and the accompanying drawings, which omit a separate designation of instructions and drawings in the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

First, the inner main portion of the vacuum circuit breaker according to the preferred embodiment of the present invention will be described with reference to FIG. 9.

The vacuum circuit breaker according to the embodiment of the present invention accumulates the elastic energy for the closing operation, and the closing spring (refer to C / S of FIG. 10) and the closing spring (C / S) for controlling the stored elastic energy during the closing operation. A closing latch lever (10) rotatable to a restraining position for maintaining the elastic energy for the closing operation in a confined state and a releasing position for releasing the elastic energy during the closing operation; An injection coil (see 11 in FIG. 2A) for rotating and driving the latch lever 10 to the release position, and a tripping spring (T in FIG. 10) that accumulates the elastic energy for the trip operation and presume the elastic energy for the trip operation. / S), a tripping latch (40) rotatable to a restraint position for the trip spring (T / S) to keep the elastic energy for the trip in the compressed state and a release position for releasing the elastic energy to prevail; When supplying the trip coil 40 to rotate the trip latch 40 to the release position (see 12 in Fig. 2a), and for the power transmission of the prevailing elastic energy of the closing spring (C / S) and trip spring (T / S) As part of the power transmission mechanism (see 13 in FIG. 1), there is provided an opening shaft lever 16 which is rotatable by the room force elastic energy.

In FIG. 9, reference numeral R / A is a rod assembly, which is composed of a rod moving up and down in accordance with the rotation of the open shaft lever 16, and then opens and closes the shaft lever and a push rod. It is connected to a movable electrode in a vacuum interrupter, which is connected to a power supply side and a load side line, respectively, via a rod and a connecting rod. In FIG. 9, reference numeral 17 is also an axis passing through the input lock cam 15 to be described as a rotating shaft of the open shaft lever 16.

In FIG. 9, the closing spring C / S and the trip spring T / S each have one end connected to both ends of the driving lever D / L, respectively, and the other end of the closing spring C / S. Is fixed on the lower side not shown support frame, the other end of the trip spring (T / S) is connected to one side of the opening and closing shaft lever to accumulate elastic energy during the closing operation. The elastic energy accumulation of the input spring C / S is, as is well known, by driving the drive lever D / L with a drive wheel WHEEL connected to the drive shaft of the motor, a crankshaft, a link, etc. coaxially connected to the drive wheel. It is made by rotating and more detailed description will be omitted.

For reference, the components after the open / close shaft lever (not shown) are referred to as main circuit parts because they have the open / close electrodes of the vacuum circuit breaker, and the parts before the open / close shaft lever (not shown) to which the present invention is applied are connected to the main circuit part. It is also called an actuator part because it provides opening and closing power.

Meanwhile, the configuration of the present invention will be described with reference to FIGS. 6 to 9 and FIG. 3 of the prior art.

The vacuum circuit breaker according to the present invention additionally includes a key lock (see 33 in FIG. 3) rotatable according to rotation of the key (see 31 in FIG. 3); A lock bolt (see 37 in FIG. 3) connected to a side of the key lock and movable back and forth according to the rotation of the key lock; A key lock holder (35) rotatably supporting the key lock and fixed to a front operation portion of the vacuum circuit breaker having a side opening (36) to allow movement of the lock bolt; The lock bolt is installed in a position where it can be rotated by the pressing of the lock bolt, and the upper part stops the rotation to the release position of the closing latch lever 10 by the pressing of the moving lock bolt, and the lower part opens the trip latch 40. An opening lock lever 20 rotatable to a releasing position, fixed to the opening shaft lever 16, rotatable with the opening shaft lever 16, and in the closed state of the opening lock lever 20; A closing lock cam 15 positioned at a position for stopping the rotation, and provided in the opening lock lever 20 so as to protrude on a rotation path of the closing lock cam 15; Meeting by 15 And a stopping action part 23 to be restrained.

In FIG. 6, reference numeral 36 is a side opening provided on the side of the key lock holder 35 as in the prior art, and the lock bolt (reference numeral 37 in FIG. 3) as described in the prior art with reference to FIG. 3. It was prepared to allow movement. In FIG. 6, reference numeral 39 denotes a support plate fixed to the support frame 1 shown in FIGS. 2A and 2B by means of fastening means such as bolts and for supporting the key lock holder 35. In FIG. 6, reference numerals 39a and 39b indicate two screw insertion holes for laying a micro switch (see FIG. 10 and FIG. 11) (Micro Switch, hereinafter referred to as Micro S / W) according to the present invention.

In FIG. 7, the three holes formed along the longitudinal direction from the center part of the input lock cam 15 are axial holes through which the rotation shaft of the open shaft lever 16 penetrates coaxially, and the other two formed along the longitudinal direction. The two holes are installation holes of fixing means (for example, bolts and nuts) for fixing the input lock cam 15 to the open shaft lever 16.

FIG. 10 is a front view illustrating internal parts of a switch and a key lock mechanism of FIG. 10 to explain a configuration and operation of a switch for preventing overexcitation of an input coil in a vacuum circuit breaker according to an exemplary embodiment of the present invention. 12 is a partially enlarged view showing an enlarged portion, and FIG. 12 is a circuit diagram of an input coil and a micro switch of a vacuum circuit breaker according to an embodiment of the present invention.

Referring to Figure 10 to 12 will be described the interlocking configuration of the switch and the key lock mechanism according to the present invention.

The vacuum circuit breaker according to the present invention is installed on the rotation path of the open lock lever 20, and is installed on the power supply path between the input coil 11 and the power supply on the electrical circuit, and rotates to the open lock lever 20. And a micro switch (M / S) capable of switching driving to cut off power supply to the input coil (11).

The micro switch M / S is installed to protrude on the rotation path of the open lock lever 20 so that an operation lever (M / S lever) for opening and closing the contact therein can be interlocked.

Meanwhile, the operation of the vacuum circuit breaker according to the present invention configured as described above will be described with reference to FIGS. 9 to 12.

In the blocking state, when the key is turned clockwise, the key lock 33 is rotated clockwise while the key lock bolt 37 is advanced in the right direction on the drawing. The advancing key lock bolt 37 presses and rotates the open lock lever 20, so that the upper portion of the open lock lever 20 restrains the rotation of the input latch lever 10 to the release position and at the same time, the open lock lever. The lower part of 20 rotates to the position which releases the trip latch 40. FIG.

Therefore, since the closing latch 40 is stopped from being rotated to the release position and the trip latch 40 is released, the vacuum circuit breaker maintains the cutoff state.

At the same time, the actuating lever (M / S lever) of the micro switch (M / S) is pressed in accordance with the rotational pressure of the open lock lever 20 to open the internal contact of the micro switch (M / S) as shown in FIG. Likewise, the micro switch M / S provided between the power supply and the input coil 11 is opened to cut off the power supply to the input coil 11, and the input coil 11 is excited when the key is operated to the restraint position. Therefore, burnout of the input coil 11 due to overexcitation can be prevented.

On the other hand, in the closing state, even if the user tries to turn the key clockwise, the closing lock cam 15 fixed to the opening shaft lever 16 is positioned at the position indicated by the dashed line in FIG. Since the stop action part 23 of 20 is restrained, the counterclockwise rotation on the drawing of the open lock lever 20 is restrained, which means that the clockwise rotational operation of the key is impossible.

Therefore, even if the user attempts to operate the key in the open restraint position, the rotation operation of the key itself is impossible.

In the above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein for the purpose of description, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the Utility Model Registration Claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the attached utility model registration claims.

According to the present invention, the blocking state is restricted only in the blocking state, and in the closing state, the key lock mechanism does not operate so as to cause a tripping operation, so that unnecessary circuit blockage due to a mistake of operation can be prevented.

In addition, in the restrained operation of the key lock mechanism, even if the operator attempts to drive the input coil due to an operator's mistake or immaturity, the micro switch cuts off the power supply to the input coil, thereby preventing overcharging of the input coil.

Claims (5)

An input spring for storing the elastic energy for the feeding operation and precipitating the elastic energy for the feeding operation; a restraint position for maintaining the elastic energy for the feeding operation in the compressed state; and an elastic energy for the feeding operation A closing latch lever rotatable to a release position for releasing, a closing coil for rotationally driving the closing latch lever to the release position when power is supplied, and elastic energy for a tripping operation A trip spring for preserving elastic elastic energy, a trip latch rotatable to a restraint position for maintaining the elastic energy for the trip in a preserved state, and a trip latch rotatable to a release position for releasing elastic energy; A trip coil for rotating the trip latch to the release position; In the vacuum breaker having a rotatable opening lever shaft (opening lever shaft) by RENT elastic energy as part of the power transmission mechanism for transmitting power to rent the elastic energy of the trip spring, A key lock rotatable according to the rotation of the key; A lock bolt connected to a side of the key lock and movable back and forth according to the rotation of the key lock; A key lock holder having a side opening for allowing movement of the lock bolt and rotatably supporting the key lock and fixed to a front operation portion of the vacuum circuit breaker; It is installed at the position which can be rotated by the pressurization of the said lock bolt in a vacuum circuit breaker, The upper part restrains rotation to the release position of the said input latch lever by the pressurization of the said advance lock bolt, and the lower part releases the trip latch. An opening lock lever rotatable to a position; And It is installed on the rotation path of the open lock lever, is installed on the power supply path between the power supply coil from the power source on the electrical circuit, switching drive by the rotating open lock lever can cut off the power supply to the input coil switch; Vacuum breaker, characterized in that comprises a. The method of claim 1, And said switch is a micro switch. An elastic spring for storing the elastic energy for the charging operation and preserving the elastic energy for the charging operation; and a restraint position for maintaining the elastic energy for the charging operation in the compressed state; A closing latch lever rotatable to a release position for releasing the presumptive force, a closing coil for rotationally driving the closing latch lever to a release position for closing operation during supply of power, and elastic energy for tripping operation And a trip spring for preserving the elastic energy accumulated in the trip operation, a trip latch rotatable to a release position for releasing the restraining position and the elastic energy for preserving the elastic energy for the trip in a compact state; Rotation drive of the trip latch to the release position for tripping operation when power is supplied. The coil and the closing spring, and a vacuum breaker having a rotatable opening lever shaft (opening lever shaft) rent by the elastic energy as part of the power transmission mechanism for transmitting power to rent the elastic energy of the trip spring, A key lock rotatable according to the rotation of the key; A lock bolt connected to a side of the key lock and movable back and forth according to the rotation of the key lock; A key lock holder having a side opening for allowing movement of the lock bolt and rotatably supporting the key lock and fixed to a front operation portion of the vacuum circuit breaker; It is installed at the position which can be rotated by the pressurization of the said lock bolt in a vacuum circuit breaker, The upper part restrains rotation to the release position of the said input latch lever by the pressurization of the said advance lock bolt, and the lower part releases the trip latch. An opening lock lever rotatable to a position; A closing lock cam fixed to the open shaft lever and rotatable with the open shaft lever, the closing lock cam being positioned at a position for stopping the rotation of the open lock lever in a closed state; And A stop action portion provided in the open lock lever so as to protrude on the rotation path of the input lock cam, the rotation action being stopped by the input lock cam in the input state; Vacuum breaker, characterized in that comprises a. The method of claim 3, wherein It is installed on the rotation path of the open lock lever, is installed on the power supply path between the input coil from the power source on the electrical circuit, the switching is driven by the rotating open lock lever can cut off the power supply to the input coil Vacuum breaker, characterized in that further comprises a switch. The method of claim 4, wherein And said switch is a micro switch.

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