JP3308776B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker.

[0002]

2. Description of the Related Art In a conventional circuit breaker, as shown in FIG. 11, a perforated hole is provided in a rear wall 2 of an arc-extinguishing chamber, and ventilation cooling by convection and discharge of a cut-off arc gas are performed through the perforated hole.

However, since dust, dust and the like intrude from the porous holes, there is a concern about the contact reliability of the contacts. Therefore, in recent years, as shown in FIG. 12, a dustproof cover 8 is attached to the rear wall 2 of the arc-extinguishing chamber. The dustproof cover 8
Is a valve that can be opened and closed according to the internal pressure of the arc-extinguishing chamber 6. Therefore, normally, the dustproof cover 8 is closed. When a short circuit accident occurs and the station is opened, the internal pressure of the arc-extinguishing chamber 6 increases, and the dust-proof cover 8 is opened as shown in FIG. 13 to discharge the arc gas to the outside.

[0004]

However, in the above-mentioned prior art, due to the consideration of the dustproofness, there is a problem in that the temperature, the breaking performance, and the like are not considered.

That is, when the above-described structure is adopted, the porous hole is closed by the dustproof cover 8. Then, ventilation by convection could not be performed, and the temperature tended to increase. To suppress heat generation, carry current (maximum allowable current)
I have to lower. However, the required specifications cannot be satisfied by reducing the energizing current. It is conceivable to reduce the current density, but to do so,
The conductor cross-sectional area must be increased, which leads to an increase in the size of the device. Thus, it has been difficult to reduce the size while suppressing the temperature rise.

[0006] The rise in temperature leads to an accelerated shortening of the life of the insulator. Further, the lubricating oil of the mechanism 7 is volatilized, and the movement of the mechanism 7 is hindered. In particular, the tripping section can be an obstacle to the automatic tripping operation when an overcurrent occurs.

When the short circuit is interrupted, the dust cover 8 may not be sufficiently opened and the arc gas may not be exhausted. In such a case, the generated arc gas (metal melt, metal vapor gas, carbon) leaks out of the arc extinguishing chamber 6 and is deposited on the mechanism 7, the handle 5, the case 12, etc. Damage will occur and the blocking performance will be reduced. For example, if the arc gas adheres to the mechanism 7, the operation may be disabled. If it adheres to the handle 5, insulation deterioration may occur, causing a ground fault electric shock during operation. If it is attached to the case 12, there is a possibility that a failure in circuit insulation may occur due to deterioration of insulation between the electrodes. There is a conventional technique for reducing such internal damage by using the handle protection separator 9 and the mechanism protection separator 10, but this has the problem of increasing the number of parts and increasing the cost of parts and assembly. Was.

An object of the present invention is to provide a small and high-performance circuit breaker.

[0009]

Means for Solving the Problems The present invention has been made to achieve the above-mentioned object, and the first aspect thereof is as follows.
A contact configured to be openable and closable, an opening and closing mechanism for opening and closing the contact, an operation handle for operating the opening and closing mechanism,
A case accommodating the contact and the opening / closing mechanism therein, a contact chamber accommodating the contact therein, and a separator for partitioning the inside of the case into a mechanism chamber accommodating a part of the opening / closing mechanism, The case further includes a first opening, and a second opening that connects the mechanism chamber to the outside world. The case connects the first opening to the mechanism chamber or the contact chamber. A circuit breaker having switching means is provided.

Preferably, the switching means operates in accordance with the pressure in the contact chamber.

The separator may be configured to be deformable and / or movable according to the pressure in the contact chamber, and the switching means may be realized by the separator. In this case, it is preferable that the switching means connects the first opening to the contact chamber when the pressure in the contact chamber is higher than the pressure in the mechanism chamber.

It is preferable that the switching means operates in response to an opening / closing operation of the contact by the opening / closing mechanism.

The separator is configured to be movable in accordance with the opening and closing operation of the contact by the opening and closing mechanism.
The switching means may be realized by the separator. In this case, the switching means connects the first opening to the contact chamber as the contact switches from the closed state to the open state, and, as the contact switches from the open state to the closed state, It is preferable that the first opening is connected to the mechanism chamber.

According to a second aspect of the present invention, there is provided a contact configured to be openable and closable, an opening and closing mechanism for opening and closing the contact,
A case partitioned into at least two rooms: an operation handle for operating the opening / closing mechanism, a contact chamber in which the contact is accommodated, and a mechanism chamber in which a part of the opening / closing mechanism is accommodated; A circuit breaker, comprising: a separator provided with a handle protection surface for protecting the operation handle and a mechanism protection surface for protecting the opening / closing mechanism.

[0015]

In a normal energized state, the switching means connects the first opening to the mechanism room. The mechanism chamber is connected to the outside world at two places, a first opening and a second opening. Therefore, the mechanism room is efficiently ventilated by the convection generated by the heat of the circuit breaker, and the temperature rise is suppressed. On the other hand, in this state, the contact chamber is not connected to the outside world. As a result, dust or the like enters the contact room and contacts /
There is no barrier to separation. That is, the reliability is high.

When the contact is separated by the opening / closing mechanism, the switching means is operated to connect the first opening to the contact chamber.
Consider a case in which the switching means operates in accordance with the internal pressure of the contact chamber (for example, it may be constituted by a separator). In this case, the arc gas generated with the separation of the contacts fills the contact chamber and increases its internal pressure. as a result,
The separator rotates (or moves) and connects the first opening to the contact chamber. Further, the switching means operates in response to the opening / closing operation of the contact by the opening / closing mechanism (for example,
(A separator may be used). In this case, with the separation of the contacts, the switching means becomes the first
Connect the opening to the contact chamber.

As a result, the arc gas generated as a result of the separation of the contacts is discharged to the outside through the first opening. Therefore, the arc gas does not overflow from the contact chamber to the mechanism room and the like, and does not damage the operation handle, the opening / closing mechanism and the like.

In the second aspect, the arc gas directed to the operation handle, the opening / closing mechanism, and the like is blocked by the handle protection surface and the mechanism protection surface of the separator. Since the separator is configured as a single component, the cost of components and the cost of assembly are not increased.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 As shown in FIG. 1, the inside of a case 12 of a circuit breaker is roughly divided into an arc-extinguishing chamber 6 and other parts by a separator 1 and the like.

In the arc-extinguishing chamber 6, the fixed contact 4 and the tip of the movable contact 15 (the side provided with the contact 150) are arranged. Further, an arc extinguishing device 11 for suppressing an arc gas g generated due to the contact / separation between the fixed contact 4 and the contact 150 is provided.

In portions other than the arc extinguishing chamber 6 in the case 12,
The mechanism unit 7 is housed. The mechanism 7 operates the movable contact 15 in response to the operation of the handle 5 by the user, thereby bringing the fixed contact 4 and the contact 150 into and out of contact with each other.

The area adjacent to the arc-extinguishing chamber 6 has a ventilation hole 20.
Is provided on the rear wall 2 of the arc-extinguishing chamber. A relay-side lid plate 3 having a ventilation hole 30 is provided below the case 12. The size of the ventilation holes 20 and the ventilation holes 30 is so small that screws and the like normally used in wiring, construction and the like cannot pass through. On the other hand, the size is such that ventilation by convection is sufficiently possible. In FIG. 1 (1), a perspective view of the rear wall 2 of the arc-extinguishing chamber is drawn near the reference numeral "2", and a perspective view of the relay side lid plate 3 is drawn similarly on the reference numeral "3". .

As a result, [external →
An air flow path (hereinafter, referred to as a “counter flow path”) is formed from the ventilation hole 30 → the inside of the case 12 (the part other than the arc extinguishing chamber 6) → the ventilation hole 20 → the outside]. In addition, a flow path (hereinafter, referred to as a “discharge path”) for discharging the arc gas g to the outside, which is called “arc extinguishing chamber 6 → ventilation hole 20 → outside”, is also formed separately. The roads are arranged in parallel with the ventilation hole 20 being shared.

As shown in FIG. 2, the separator 1 is composed of a handle protection surface 18 for protecting the handle 5 and a mechanism protection surface 19 for protecting the mechanism 7. The handle protection surface 18 and the mechanism protection surface 19 are connected at one side 180, and the angle between the two can be freely changed with the one side 180 as a fulcrum.

In the case 12, the separator 1 is fixed such that the mechanical part protection surface 19 is sandwiched between the case 12 and the lower part of the arc extinguishing device 11. Therefore, in this state, only the handle protection surface 18 is actually in a rotatable state. The handle protection surface 18 is arranged at a position close to the above-described ventilation hole 20 and at a position within the movable range angle so as to include a region where the ventilation hole 20 is provided. In the vicinity of the ventilation hole 20, the handle protection surface 18 forms a partition between the convection flow path and the discharge path.
Therefore, the rotation of the handle protection surface 18 connects the ventilation hole 20 to the above-described counter flow path or discharge path. That is, the handle protection surface 18 of the separator 1
Plays a role of switching between the two flow paths. Rotation of the handle protection surface 18 (that is, switching of the flow path)
Is caused by the fluctuation of the internal pressure in the arc-extinguishing chamber 6.

An opening 17 through which the movable contact 15 passes is provided on the mechanical section protection surface 19 of the separator 1. The opening 17 is shaped and sized so as to cover the entire operation range of the movable contact 15 in a plane including the mechanism section protection surface 19. (See FIG. 2). Therefore, the mechanism protection surface 19 does not hinder the operation of the movable contact 15.

The shape (outline) of the entire separator 1 is adapted to the shape of the inner wall surface of the case 12 so as not to interfere with the movement of each part.

In this embodiment, the separator 1 is constituted by bending one sheet material. The separator 1 is made of a material having flexibility and flame resistance that can withstand arc gas at the time of interruption (for example, flame-retardant fiber, Nomex, Teflon sheet, polyester).

The "contact chamber" in the claims corresponds to the arc-extinguishing chamber 6 in this embodiment. The “mechanism room” corresponds to a portion of the case 12 that accommodates the mechanism 7 and the like other than the arc extinguishing chamber 6.
The “opening / closing mechanism” corresponds to the mechanism section 7 and the like.
The “first opening” corresponds to the ventilation hole 20. The “second opening” corresponds to the ventilation hole 30. The “switching means” corresponds to the separator 1.

The operation will be described.

During normal energization, as shown in FIG. 1A, the handle protection surface 18 of the separator 1 is
Is connected to the counter flow path. The air in the convection passage is replaced by convection generated by heat in the circuit breaker, thereby cooling the circuit breaker. In this state, the ventilation hole 20 is not communicated with the arc extinguishing chamber 6. Therefore, the dust d does not enter through the ventilation hole 20 and does not hinder the connection / separation between the fixed contact 4 and the contact 150.

When the movable contact 15 is actuated due to the occurrence of a short circuit and the fixed contact 4 is separated from the contact 150, an arc gas g is generated. The inside of the arc-extinguishing chamber 6 is not partitioned while keeping the other parts in the case 12 airtight.
However, since the generation of the arc gas g is rapid,
The internal pressure of the arc-extinguishing chamber 6 rises, and its pressure value becomes higher than that of parts other than the arc-extinguishing chamber. Then, the handle protection surface 18 of the separator 1 rotates, and the ventilation hole 20 communicates with the arc-extinguishing chamber 6. As a result, the arc gas g goes outside through the ventilation hole 20. Although the arc gas g may come out of the arc extinguishing chamber 6 through the gap of the separator 1, the handle 5, the mechanism 7
, So that arc gas damage is minimized. The state at this time is shown in FIG.
It was shown to.

The configuration of the first embodiment is preferably applied to a relatively small circuit breaker. This is because the opening 17 must be larger than the movable contact 15. In a large circuit breaker, since the movable contact 15 itself is large, the leakage of arc gas through the opening 17 increases.

The specific shape and application of the separator 1 are not limited to those shown in FIG. For example, the shape shown in FIG. 3 is also possible.

FIG. 3A shows the separator 1 shown in FIG.
In this example, a component 171 is combined and applied. The component 171 has an opening 1 having substantially the same shape as the cross section of the movable contact 15.
72 is a plate having temporary flexibility. After the opening 172 is elastically deformed and the movable contact 15 is mounted on the component 171, the opening 172 returns to its original size and the space between the opening 172 and the movable contact 15 is substantially closed. The movable contact 15 is passed through the opening 17 of the separator 1 with the component 171 mounted thereon, and the interval between the component 171 and the separator 1 is set to a size that can substantially prevent the outflow of the arc gas to the mechanical unit side. I do. Thereby, the gap between the opening 17 and the movable contact 15 is substantially closed by the component 171. In this state, the component 171 is provided slidably with respect to the separator 1, so that the component 171 is slidable in conjunction with the movement of the movable contact 15. The component 171 does not hinder the movement of the movable contact 15. In this example, it is possible to minimize the amount of arc gas flowing out of the gap between the opening 17 and the movable contact 15 to the mechanism. If the separator 1 and the component 171 are in contact,
Outflow of arc gas from the gap between the separator 1 and the component 171 can also be suppressed.

FIG. 3 (2) shows an example in which a cutout portion 170 is provided on the mechanical section protection surface 19, and the movable contact 15 is passed through the cutout portion 170. In this example, the separator 1 can be attached after assembling the movable contact 15 and the like, and the assembling property is good.

FIGS. 3 (5) and (6) show the handle protection surface 1.
8 is not provided. The whole of the separator 1 is constituted only by the mechanical part protection surface 19, and the lower part thereof is attached to the arc extinguishing device 11. FIG. 4 shows a state where such a separator 1 is actually attached to a circuit breaker.

FIGS. 3 (3) and 3 (4) show a combination of the structure of FIG. 3 (1) and the structures of FIGS. 3 (5) and 3 (6). That is, the handle protection surface 18 and the mechanism portion protection surface 1
And 9 are configured separately. And handle protection surface 1
8 has its lower part fixed to the arc extinguishing device 11, while the mechanism protection surface 19 is sandwiched between the case 12 and the arc extinguishing device 11. The handle protection surface 18 and the mechanism protection surface 19 may or may not be connected.

Embodiment 2 Embodiment 2 is characterized in that a dustproof cover 8 for closing a ventilation hole 20 is provided on the rear wall 2 of the arc-extinguishing chamber as shown in FIG. In FIG. 5A, a perspective view of the rear wall 2 of the arc-extinguishing chamber provided with the dust cover 8 is shown on the side of the reference numeral 2.

During normal energization, the dust cover 8 completely covers the ventilation hole 20. The situation at this time is shown in FIG.
It was shown to. However, when the arc gas g is generated, the internal pressure of the arc extinction chamber 6 increases, and the dust cover 8 is pushed up. The arc gas g goes outside through the ventilation hole 20. The state at this time is shown in FIG.

In the second embodiment, the separator 1
The mechanism 7 and the handle 5 can be protected from the arc gas g. In addition, since the separator 1 is formed as a single component, there is no increase in component costs and no complicated assembly process.

However, in the second embodiment, since the dust cover 8 is provided, ventilation through the convection channel cannot be expected. Therefore, in the second embodiment, the handle protection surface 1 of the separator 1 is used.
It is not necessary to make 8 pivotable. Handle protection surface 1
8 may be fixed in a state where the arc-extinguishing chamber 6 and the ventilation hole 20 communicate with each other. Even in such a case, in the second embodiment, since the dustproof cover 8 covers the ventilation hole 20, there is no possibility that dust or the like enters the arc-extinguishing chamber 6.

Embodiment 3 The third embodiment differs from the first embodiment in that the switching between the discharge path and the counter flow path is performed not by the rotating operation of the separator but by the sliding operation (parallel movement) of the separator. Are different. The difference is that such a movement of the separator is created by the movable contact 15 (Note: In the first embodiment, the rotation operation of the separator is realized by utilizing the change in the internal pressure of the arc-extinguishing chamber 6). As shown in FIG. 6, the separator 1 of the third embodiment has an upper surface 22, a handle protection surface 18, and a mechanism protection surface 19 that are substantially “U”.
It is configured to be connected to the shape of a letter.

The upper surface 22 is provided with an exhaust hole 220 for passing the arc gas g. On the other hand, an opening 17 through which the movable contact 15 passes is provided on the mechanism section protection surface 19 opposed thereto. The opening 17 has substantially the same shape and size as the cross section of the movable contact 15 on the mechanism section protection surface 19.

When the separator 1 is incorporated in the circuit breaker, the mechanical protection surface 19 is provided with the arc extinguishing device 1.
1 below. The mechanism section protection surface 19 is not restricted in the movement in the horizontal direction in the figure. on the other hand,
The upper surface 22 is kept parallel to the rear wall 2 of the arc-extinguishing chamber and in contact with the inner surface of the upper surface 22. The upper surface 22 is not fixed to the rear wall 2 of the arc-extinguishing chamber. Therefore,
In the assembled state, the separator 1 is a movable contact 1
5 to move left and right. When the movable contact 15 is located on the left side (see FIG. 8), the separator 1 is also located on the left side. Conversely, when the movable contact 15 is located on the right side (see FIG. 8), the separator 1
Is also located on the right.

The rear wall 2 of the arc-extinguishing chamber is provided with a ventilation hole 20 in a right region thereof (that is, a region where the exhaust hole 220 faces when the separator 1 is located on the rightmost side). However, when the separator 1 is located at the leftmost region in the left region (ie, when the exhaust holes 22
No ventilation hole 20 is provided in the region (opposite to 0). Therefore, the communication state between the outside and the arc-extinguishing chamber 6 through the ventilation hole 20 and the exhaust hole 220 differs depending on the position of the separator 1 in the left-right direction.

The operation will be described.

The separator 1 is moved with the operation of the movable contact 15.

In the energized state, since the movable contact 15 is located on the left side, the separator 1 is also located on the left side (see FIG. 7A). In this state, the exhaust hole 220 and the ventilation hole 20 are located apart from each other, and the arc extinguishing chamber 6 is not in communication with the outside. The ventilation hole 20 is in a state of being connected to the counter flow path. Therefore, the temperature rise in the circuit breaker is suppressed by the ventilation through the counter flow path.

When the circuit is cut off, the tip of the movable contact 15 (the side where the contact 150 is installed) moves to the right. Then, in conjunction with this, the separator 1 is also located on the right side (see FIG. 7 (2)). In this state, the exhaust holes 220
And the ventilation hole 20 are at the same position, so that the arc-extinguishing chamber 6 communicates with the outside. That is, the ventilation hole 20 is in a state of being connected to the discharge path. Therefore, the arc gas g generated when the circuit is cut off is discharged outside through the discharge path.

In FIG. 8, the upper surface 22 provided with the exhaust hole 220 is omitted.

The configuration of the third embodiment can be applied to a circuit breaker having a large movable contact 15 (that is, a large circuit breaker) because the opening 17 can be made smaller than that of the first embodiment.

The configurations of the above embodiments may be combined as appropriate. For example, the separator 1 may slide according to the internal pressure of the arc-extinguishing chamber 6. Conversely, the movable contact 15 may rotate the handle protection surface 18 of the separator.

In order to confirm the effects of the present invention, JIS-C
The test specified in the 8370 standard was performed. How to explain the results of the test.

An experiment was conducted to compare the temperature inside the circuit breaker between a circuit breaker having a convection ventilation structure (Example 1, FIG. 1) and a circuit breaker without a ventilation structure (prior art). The results are shown in FIG. As can be seen from FIG. 9, the embodiment 1 having the convection ventilation structure has the
2 degrees lower temperature. From this result, it was confirmed that the convection ventilation structure was effective in suppressing the temperature rise in the circuit breaker.

A cut-off test was conducted to actually cut off the circuit with a circuit breaker. FIG. 10 shows the results of measurement of the current and voltage fluctuations at the time of circuit interruption with an oscilloscope.
It was shown to. As can be seen from FIG. 10, in the conventional circuit breaker, it took 12 ms to cut off the circuit. On the other hand, the circuit breaker of the present invention required only 9.5 ms, and it was confirmed that the circuit breaker was excellent in terms of circuit breaking performance. The mechanism for interrupting both circuits is basically the same. Therefore, it is considered that such a difference is caused by the fact that the temperature rise in the circuit breaker of the present invention is suppressed.

[0058]

As described above, in the circuit breaker to which the present invention is applied, a rise in temperature is suppressed. In addition, it is possible to prevent the circuit breaking performance from being reduced.

Incidentally, the arc energy is given by the following equation (1).
Is defined by

[0060]

(Equation 1)

As is evident from Equation 1, the shorter the time required for breaking, the smaller the arc energy (passing energy) passing between the contacts. Therefore, by applying the present invention, damage inside the circuit breaker can be reduced. This is effective in achieving a small and high performance circuit breaker.

The thermal energy generated by energization is defined by the following equation (2).

[0063]

(Equation 2)

As is apparent from Equation 2, the shorter the time required for breaking, the smaller the heat energy generated at the contact portion. As a result, damage to the switchboard and the electric circuit is reduced.

Further, the separator has a simple structure and can be manufactured at low cost. Therefore, there is almost no increase in the manufacturing cost of the circuit breaker due to the application of the present invention.

[Brief description of the drawings]

FIG. 1 is a side perspective view and a main part perspective view of a circuit breaker having a convection ventilation structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an attachment relationship between a separator 1 and a movable contact 15;

FIG. 3 is a perspective view showing various shape examples of a separator.

FIG. 4 shows a separator 1 having only a handle protection surface 18.
It is a principal part perspective view which shows the attachment state of.

FIG. 5 is a side perspective view and a main part perspective view of a circuit breaker having a dustproof cover 8, which is Embodiment 2 of the present invention.

FIG. 6 is a circuit breaker according to a third embodiment of the present invention;
The separator 1.

FIG. 7 is a side perspective view and a main part perspective view of a circuit breaker in which a separator 1 slides according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing an attachment relationship between a separator 1 and a movable contact 15;

FIG. 9 is a graph showing a temperature test result.

FIG. 10 is a diagram showing a current waveform and a voltage waveform during a cutoff test.

FIG. 11 is a side perspective view and a main part perspective view showing the structure of a conventional circuit breaker.

FIG. 12 is a side perspective view and a main part perspective view showing the structure of a conventional circuit breaker.

FIG. 13 is an exploded perspective view showing a state in which arc gas is discharged in the circuit breaker of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Separator, 2 ... Arc extinguishing room rear wall, 3 ... Relay side lid plate, 4 ... Fixed contact, 5 ... Handle, 6 ... Arc extinguishing room, 7 ... Mechanical part, 8 ... Dustproof cover, 9 ... Handle protection separator,
10 ... mechanical part protection separator, 11 ... arc extinguishing device, 12 ...
Case, 15: movable contact, 17: opening hole, 18: handle protection surface, 19: mechanism part protection surface, 20: ventilation hole, 22
... upper surface, 30 ... ventilation hole, 150 ... contact, 170 ... cutout portion, 180 ... one side, 220 ... exhaust hole, d ... dust,
f: convection, g: arc gas

Continuation of the front page (56) References JP-A-7-21898 (JP, A) JP-A 4-131844 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 73 / 20 H01H 73/06

Claims (6)

(57) [Claims] And 1. A contacts can be opened and closed configuration, the opening and closing mechanism for opening and closing the contacts, an operating handle for actuating the closing mechanism, a case accommodating the contact and a switching mechanism therein, in the case a contact chamber which is accommodated in the contact, and a separator for partitioning into a part of which is housed the mechanism compartment of the opening and closing mechanism, in the case, the contact chamber, and, Dochi of the mechanism chamber
Switch connecting the one Laka, a first opening connecting with the outside world, in the mechanism chamber and a second opening connecting the outside world, wherein the mechanism compartment or the contact chamber and the first opening and means, said switching means operates in response to the pressure of the contact chamber
Circuit breaker, characterized in that. 2. The separator according to claim 1, wherein the pressure in the contact chamber is increased.
Is deformed or movable in accordance, the switching means is realized by the separator
It is shall, circuit breaker according to claim 1, wherein. 3. The switching means according to claim 1, wherein the pressure in the contact chamber is higher than the pressure in the mechanism chamber.
In this case, the first opening is connected to the contact chamber.
It, circuit breaker according to claim 2, wherein. 4. The switching means is provided by the opening / closing mechanism.
2. The circuit breaker according to claim 1, wherein the circuit breaker operates in response to the opening / closing operation of the contact . 5. The separator according to claim 1 , wherein the opening and closing mechanism includes
The switching means is configured to be movable in accordance with the opening and closing operation of the contact, and the switching means is realized by the separator.
5. The circuit interruption according to claim 4, wherein
Breaker. 6. The switching means determines whether the contact is in a closed state.
With the switch to the open state, the first opening is
Connected to the contact chamber, and as the contact switches from the open state to the closed state,
Connecting the first opening to the mechanism chamber.
The circuit breaker according to claim 5.