JPH08161991A - Circuit breaker - Google Patents

Abstract

PURPOSE: To allow the on and off positions of a control handle to readily coincide with the supply and interruption of power to a load, respectively, by using a drive means as a pressure contact-closing drive means which presses and closes a grounded contact following the closing operation of the control handle. CONSTITUTION: A drive means 40 serves as a pressure contact-closing drive means which closes a grounded contact 20 by pressing a grounded movable contact 22 following the closing operation of a control handle 35. When the control handle 35 is on, a power side contact 10 is closed and the grounded movable contact 22 is pressed toward a grounded fixed contact 21 so that the grounded contact 20 is surely closed, thus supplying power. When the control handle 35 is off, the power side contact 10 is opened to interrupt power even if, for example, the force of a grounded closing spring 23 weakens or the grounded contact 20 becomes unopenable as the grounded movable contact 22 is hooked to a body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker in which a power source side contact is opened / closed by an operating handle and a ground side contact is opened / closed by a driving means interlocked with the operating handle.

[0002]

2. Description of the Related Art Generally, in a distribution board containing a circuit breaker, a main circuit breaker is arranged in the upper center of the circuit breaker, and a main bar is connected to the output side of the main circuit breaker so that the main bar on the power supply side is connected. Is connected to the input side of the branch breaker, and the ground-side main bar is connected to the neutral switch arranged at the bottom of the distribution board. When power is supplied to the load from this distribution board, the power supply side line is led to the load from the output terminal of the branch breaker and the ground side line is led to the load from the neutral switch.

However, since the power supply side line leading to the load is derived from the output terminal of the branch breaker and the ground side line is derived from the neutral switch provided at a position distant from the branch breaker, the power source side line leading to the load side. It is necessary to change the length of each of the pair of electric wires of the grounding side wire and the grounding side wire and to connect the electric wires inside the distribution board, which deteriorates the wiring workability.

Therefore, the applicant has arranged the input / output terminals of the power supply side line and the ground side line of the electric circuit on the upper and lower stages on both sides of the housing of the circuit breaker, and the power supply side contact and the ground side between the respective input / output terminals. With intervening contacts (Japanese Patent Laid-Open No. 4-332)
No. 29 publication) is proposed. This one opens and closes the power source side contact by opening and closing the operation handle, and opens and closes the ground side contact by the driving means interlocking with the operation handle, like the normal one-pole type circuit breaker. The ground side contact is
The ground-side movable contact formed of a leaf spring is spring-biased in a direction of contacting the ground-side fixed contact.

The operation of opening and closing the ground contact of the circuit breaker is performed by operating the operation handle to the off side while the power supply contact is closed and pressing the drive means at one end of the operation handle. The contact is opened, and when the power supply side contact is open, the operation handle is turned on to open the drive means to close the ground side contact by the spring force of the ground side movable contact. ing.

According to this circuit breaker, the ground-side contact connected to the ground-side wire of the electric path is housed in the housing, so that the wiring between the ground-side wire and the load side does not have to be routed inside the distribution board, and the wiring can be performed. Work becomes easy. Further, since the grounding side contact is opened / closed via the driving means to the operation handle for opening / closing the power source side contact, it is possible to open / close the power source side contact and the grounding side contact only by opening / closing the operation handle, and the insulation resistance of the load. The work of measuring is easy.

[0007]

However, in the above-mentioned circuit breaker, the operation handle is operated to the off side and the driving means is pushed by one end of the operation handle to move the ground side movable contactor. The ground side contact is opened against the spring force, and the operating handle is operated to the on side to open the drive means so that the ground side contact is closed by the spring force of the ground side movable contact. , Even if the operation handle is turned on, if the spring force of the ground side movable contact becomes weaker or the ground side movable contact or the driving means gets caught in the housing, the ground side movable contact makes the ground side fixed contact. May not contact the child. In this case, even if the operation handle is operated to the on side and the power supply side contact is closed, the power cannot be supplied, and the on / off position of the operation handle and the power supply / interruption state to the load can be matched. There was a problem that I could not.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a circuit breaker in which it is easy to match the on / off position of the operating handle with the power supply / interruption state to the load. To do.

[0009]

In order to solve the above problems, a circuit breaker according to a first aspect of the present invention includes a power source side contact and a ground side contact interposed in each of the electric paths formed by the power source side line and the ground side line, A shut-off mechanism that has an operating handle that opens and closes the contact on the power supply side and forcibly opens the contact on the power supply side in response to an abnormality in the current flowing through the contact on the power supply side, and opens and closes the contact on the ground side as the operation handle is opened and closed. In the circuit breaker including the driving means, the driving means is configured as a pressing and closing driving means that presses and closes the ground side contact in accordance with the closing operation of the operating handle.

According to another aspect of the circuit breaker of the present invention, the driving means of the first aspect is configured to open and close the ground side contact on the opening side rather than the closing position of the power source side contact by the operating handle. .

According to a third aspect of the circuit breaker, the operating handle or the driving means of the first or second aspect closes the ground side movable contactor when the power source side contact is forcibly opened. The structure is provided with a drive restraining unit that holds the state.

According to a fourth aspect of the circuit breaker, a partition wall is interposed between the power source side contact and the ground side contact of the first to third aspects.

According to another aspect of the circuit breaker of the present invention, the drive means according to any one of the first to fourth aspects is rotated by the first drive member connected to the operating handle and the drive of the first drive member. And a non-circular second drive member that is in contact with the ground-side movable contact and has a different distance from the center of rotation.

[0014]

According to the structure of the present invention, since the driving means is the pressing and closing driving means for pressing and closing the ground side contact in accordance with the closing operation of the operating handle, when the operating handle is turned on, the power source is turned on. The side contact is closed, and the ground side contact is pressed by the drive means to be surely closed to enter the power supply state. Also, when the operation handle is turned off, at least the power supply side contact is opened and the power is cut off. .

According to the second aspect of the present invention, the grounding side contact is opened and closed on the opening side of the power source side contact point closed by the operating handle. Therefore, when the operating handle is turned on, the grounding side contact point is opened. The contact is closed first, and when the operation handle is turned off, the contact on the power source side is opened first.

According to the third aspect of the present invention, when the contact on the power source side is forcibly opened, the drive restraining portion holds the movable contact on the ground side in the closed state, so that the contact on the power source side is forcibly opened. Occurrence of an arc, which sometimes occurs when the ground contact is opened, can be suppressed.

According to the fourth aspect of the invention, since the isolation wall is interposed between the power source side contact and the ground side contact, the opening / closing operation of the power source side contact and the ground side contact are isolated. You can

According to the fifth aspect of the present invention, the drive means includes the first drive member connected to the operation handle, and the rotation center which is rotated by the drive of the first drive member and abuts on the ground side movable contact. And a non-circular second drive member having different distances from each other, the first drive member is interlocked with the opening / closing operation of the operation handle, the second drive member is rotated, and the ground side movable contact is brought into contact with the ground side. It comes in and out of the fixed contact.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, this circuit breaker has a body 1 having openings on the front and back sides, in which components are laterally fitted, and a first cover 2 for closing the opening on the front of the body 1.
And a second cover 3 that closes the opening on the back of the body 1 to form a housing. This body 1 and both covers 2,
As shown in FIG. 2 and FIG. 3, a rectangular handle protrusion 1a that is inserted into a window hole formed in the inner lid of the distribution board is formed on the upper surface of the center of the 3, and both sides thereof are formed. Power supply side input / output terminal 4, which is connected to the power supply side wire and the ground side wire of the electric circuit,
5 and ground side input / output terminals 6 and 7 are equipped.

As shown in FIG. 2, the opening on the front side of the body 1 is provided with a guide groove for holding a blocking mechanism 30 which will be described later.
1b, an exhaust wall 1c that forms an exhaust passage for the arc gas accompanying the opening and closing of a power supply side contact 10 described below between the bottom surface, and an insertion port through which a driving means 40 described below is movably inserted An isolation wall 1d for isolating the contact 10 and the ground side contact 20 is formed. As shown in FIG. 4, the opening on the rear side of the body 1 is formed with a storage portion 1e for storing the ground side contact 20 which is opened / closed by the driving means 40, and the braided wire 8 which is the ground side energization path is formed. It is stored. The storage portion 1e is formed with a holding projection 1f for holding a ground side movable contact 22 described later in a state of being separated from the ground side fixed contact 21.
In this body 1, the power supply side contact 10 intervening in the power supply side wire of the electric line, the ground side contact 20 interposing in the grounding side wire of the electric line, the breaking mechanism 30 for opening and closing the power supply side contact 10, and the ground side contact 20 are opened and closed. The driving means 40 for driving is housed.

As shown in FIG. 3, the power source side contact 10 includes a power source side fixed contact 11 fixed to the power source side input terminal 4 and a power source side movable contact 12 facing the power source side fixed contact 11.
And is arranged in the opening on the front side of the body 1. Then, by closing the electrodes, the power-supply-side input terminal 4 and the power-supply-side output terminal 5 are brought into conduction via the bimetal 33 and the braided wire. As shown in FIG. 2, the ground-side contact 20 includes a ground-side fixed contact 21 that is integrally formed with the ground-side output terminal 7.
And a ground-side movable contact 22 that faces the ground-side fixed contact 21 so that it can come into contact with and separate from the ground-side fixed contact 21, and a ground-side opening that urges the ground-side movable contact 22 away from the ground-side fixed contact 21. Spring
23 and the power supply side contact 10 with the isolation wall 1d interposed.
It is arranged in an opening on the back side of the body 1 so as to be isolated from the above, and the influence of the arc due to the opening / closing operation of the power source side contact 10 is eliminated to prevent insulation failure.

The ground contact 20 is opened and closed by the drive means 40 which is interlocked with the operation handle 35.
As shown in FIG. 4, the bent portion of the ground-side movable contact 22 contacts the holding projection 1f in the open state to prevent the spring force of the ground-side opening spring 23 from being applied to the driving means 40. As shown in the figure, the ground-side movable contact 22 and the ground-side fixed contact are centered around the contact position of the driving means 40 with the ground-side movable contact 22 by the spring force of the ground-side opening spring 23 in the closed state. Apply contact pressure to the contact point with the child 21.

The breaking mechanism 30 fixes the movable contact 12 on the power source side to a contact drive plate 31 on the power source side formed in a substantially U shape, and the movable contact 12 on the power source side of the contact drive plate 31 on the power source side in the opening direction. A power source side opening spring 32 for urging, a bimetal 33 having one end fixed to the power source side contact drive plate 31 and the other end being a free end and arranged inside the power source side contact drive plate 31, and a power source side contact Drive plate 31
Is pivoted to one end 34a, an operation handle 35 pivotally attached to the other end 34b of the coupling link 34 for opening and closing the power source side contact 10 from the outside of the body 1, and rotation of the power source side contact drive plate 31. The latch link 36 is spring-biased to the other end of the bimetal 33 with the center point as a fulcrum, and the central portion is the power source side contact drive plate.
A trip link 37 that is pivotally attached to 31 and one end 37a of which is latch-engaged with a latch link 36; and an operation link 38 that is pivotally attached to the operation handle 35 at one end 38a and pivotally attached at the other end of the trip link 37 at the other end 38b. ,,.

The operating handle 35 is formed of an insulating material such as synthetic resin, and has a connection point with the other end 34b of the connection link 34 as a rotation center point. The power source side contact 10 is forcibly opened near the rotation center point. A long hole-shaped drive restraint portion 35a is provided to prevent the drive means 40 from interlocking when the electrodes are poled, and is locked to the operating link 38 when the power source side contact 10 is forcibly opened to neutralize the on / off position. Locking projection 35 to be held in position
b is provided. The operation link 38 is provided with the operation handle 35.
The neutral position that locks the link spring that connects the trip link 37 with the trip link 37 and the locking protrusion 35b of the operation handle 35 to hold the operation handle 35 in the on / off neutral position when the contact 10 on the power supply side is forcibly opened. The link plate has a restricting piece 38c, and both ends of the link spring are loosely inserted to restrict the bending amount of the link spring.

The operation of the shut-off mechanism 30 will be described. First, when the operation handle 35 is tilted from the off position side shown in FIG. 3 toward the on position side shown in FIG. 5, a trip link is generated as the operation handle 35 rotates. 37 rotates clockwise in FIG. 3, and one end 37a thereof starts to push the latch link 36. Then, when one end 38a of the operating link 38 crosses a straight line connecting the other end 34b of the connecting link 34 and the other end 38b of the operating link 38, the power source side contact drive plate 31 rapidly moves around the one end 34a of the connecting link 34. Inverting, as shown in FIG. 5, the power supply side movable contact 12 contacts the power supply side fixed contact 11. Further, as shown in FIG. 5, when the power supply side contact 10 is in the closed state, the power supply side contact 10
When an abnormal current such as an overcurrent or a short-circuit current flows in 10, the bimetal 33 slides in the bottom direction of the body 1, the latch link 36 rotates clockwise, and the trip link 37 latch-engaged with the latch link 36 is released. The trip link 37 is released, and the other end of the trip link 37 rotates clockwise around the center.
Then, the power source side contact drive plate 31 rotates counterclockwise around the one end 34a of the connection link 34 by the power source side opening spring 32, so that the power source side movable contact 12 becomes the power source side fixed contact as shown in FIG. By separating from 11, the power source side contact 10 is forcibly opened. At this time, the operation handle 35 is
35b is locked to the neutral position restricting piece 38c of the actuation link 38 and held at the neutral position of the on / off position, thereby indicating that the power source side contact 10 is forcibly opened and inhibiting the driving means 40 from being driven. The part 35a is not linked.

The driving means 40 has one end 41a at the operation handle 35.
The first drive member 41 interlocked with the operation handle 35 by allowing the other end 41b to be located on the side of the second cover 3 via the isolation wall 1d, while allowing the other end 41b to be loosely inserted into the drive restraint portion 35a.
The second drive member 42 is connected to the other end 41b of the drive shaft 41 and is rotated by the drive of the first drive member 41. First
The driving member 41 is formed into a substantially Z shape by bending one end 41a and the other end 41b in opposite directions, and each has a manipulation handle.
35 and the second driving member 42. Second drive member 42
Is formed of an insulating material such as a synthetic resin in a non-circular egg shape, and is rotatably and pivotally attached to the body 1. The second drive member 42 drives the ground-side movable contact 22 to move toward and away from the ground-side fixed contact 21 by using a contact part 42a that abuts the ground-side movable contact 22 with a longer distance from the rotation center point. In addition, the other side on the straight line connecting the contact portion 42a and the rotation center point is used as the interlocking portion 42b interlocking with the first driving member 41.
By driving the driving member 41, the interlocking portion 42b is driven with the rotation center point of the second driving member 42 as a fulcrum, and the abutting portion 42a brings the movable contact 22 on the ground side into contact with and separates from the fixed contact 21 on the ground side.

In general, in order to supply power to a load, the contacts on the power supply side and the contacts on the ground side must be closed, and when interrupting the power supply to the load, at least only the contacts on the power supply side are closed. Open the contact. According to the present embodiment, the drive means 40 is a pressing and closing drive means for pressing the ground side movable contact 22 to close the ground side contact 20 in accordance with the closing operation of the operation handle 35, and therefore, the operation is performed. When the handle 35 is turned on, the contact 10 on the power supply side is closed, the movable contact 22 on the ground side is pressed against the fixed contact 21 on the ground side, and the contact 20 on the ground side is securely closed, and the power is supplied. , When the operation handle 35 is turned off, for example, the grounding side opening spring 23
If the spring force of the
Even if the ground side contact 20 cannot be opened due to being caught on the power source side contact 10, the power source side contact 10 is opened and the power is cut off. Therefore, it is possible to easily match the on / off position of the operation handle 35 with the power supply / interruption state to the load.

Further, when the operating means cannot be opened / closed because the driving means is caught on the ground side movable contactor, the on / off position of the operating handle is the power supply state to the load, and the on / off position of the operating handle and the load are not supplied. It is possible to easily match the power supply / interruption states of.

By setting the hole diameter of the drive restraining portion 35a of the operating handle 35, the grounding side contact 20 is opened and closed on the open side of the power source side contact 10 of the operating handle 35. Therefore, it is possible to prevent the arc from being generated when the ground side contact 20 is opened and closed, and to reduce the wear of the ground side contact 20.

Next, the opening / closing operation of the ground contact 20 by the operating handle 35 and the driving means 40 will be described. First, FIG.
Also, as shown in FIG. 4, with the operation handle 35 at the off position side and the power supply side contact 10 and the ground side contact 20 opened,
As shown in FIG. 5, when the operation handle 35 is tilted toward the ON position side, the one end 41a of the first drive member 41 is moved to the operation handle side.
The entire first driving member 41 moves to the input terminals 4 and 6 side by contacting the end of 35, and the other end 41b of the first driving member 41 as shown in FIG.
When the interlocking portion 42b is driven by the second drive member 42
Rotates about the center of rotation as a fulcrum, and the contact portion 42a presses the ground side movable contact 22 to bring the ground side movable contact 22 into contact with the ground side fixed contact 21. After the ground contact 20 is closed,
By the operation of the operation handle 35 described above, the power source side contact 10 is closed as shown in FIG. At this time, as shown in FIG. 6, the interlocking portion 42b of the second drive member 42 is slightly on the side of the input terminals 4 and 6 with respect to the contact portion 42a, and this state is maintained.

Further, as shown in FIGS. 5 and 6, with the operation handle 35 at the ON position side and the power source side contact 10 and the ground side contact 20 closed, the operation handle 35 is moved toward the OFF position side. When tilted, the contact 10 on the power supply side is opened as shown in FIG. After the contact 10 on the power supply side is opened, the first driving member 41
One end 41a of the first contact member abuts on the end of the operation handle 35, and the entire first driving member 41 moves to the output terminals 5 and 7 side, as shown in FIG.
When the interlocking portion 42b is driven by the other end 41b of the first driving member 41, the second driving member 42 rotates about the center of rotation as a fulcrum, and the abutting portion 42a does not press the ground side movable contact 22 and the ground contact is made. The side movable contact 22 is separated from the ground side fixed contact 21 to open the ground side contact 20.

When an abnormal current such as an overcurrent or a short-circuit current flows to the power source contact 10 while the power source side contact 10 and the ground side contact 20 are closed, the power source side contact 10 is forcibly opened as described above. At the same time, the operation handle 35 is held at the on / off neutral position. At this time, the drive suppressing portion of the operation handle 35
The driving means 40 composed of the first driving member 41 and the second driving member 42 is not driven by 35a, and the ground side movable contact 22 is in the ON position of the operation handle 35, that is, the ground side contact 20 is closed. Held in.

According to this embodiment, the operation handle is formed with a drive restraining portion for holding the ground side movable contact at the ON position of the operation handle when the power source side contact is forcibly opened. However, the grounding side contact may be kept closed when the power source side contact is forcibly opened, such as loosely inserting the first driving member by making the hole of the interlocking portion of the second driving member a long hole. Good.

Further, the operation handle is not always held in the neutral position when the contact on the power source side is forcibly opened.
Normally, when the drive member is interlocked with the operation handle and the power source side contact is forcibly opened, if the drive member is not interlocked with the operation handle, the operation handle will be opened when the power source side contact is forcibly opened. It may move to an on or off position.

[0036]

According to the circuit breaker of the first aspect of the present invention, the drive means is the push-closed drive means for pushing and closing the ground side contact in accordance with the closing operation of the operating handle. When turned on, the contact on the power supply side is closed and the contact on the ground side is pressed by the drive means to ensure the contact closure.
When the power is supplied, and when the operation handle is turned off, at least the contact on the power supply side is opened and the power is cut off. Therefore, it is possible to easily match the on / off position of the operation handle with the power supply / interruption state to the load.

According to the circuit breaker of the second aspect, the ground-side contact is opened and closed on the opening side of the power-side contact closed position by the operating handle. When the handle is turned on, the ground contact can be closed first, and when the handle is turned off, the power contact can be opened first so that no arc is generated when the ground contact is opened or closed. , It is possible to prevent contact wear due to the arc of the ground side contact.

According to the circuit breaker of the third aspect, when the power source side contact is forcibly opened, the grounding side movable contact is held in the closed state by the drive inhibiting portion. In addition to the effect of item 2, it is possible to suppress the arc generation that occurs when the ground side contact is opened during the forced opening of the power source side contact,
It is possible to prevent contact wear of the ground side contact.

According to the circuit breaker of the fourth aspect, since the isolation wall is interposed between the power source side contact and the ground side contact,
In addition to the effects of claims 1 to 3, it is possible to separate the opening / closing operation of the power source side contact and the opening / closing operation of the ground side contact, and the influence of the arc generated when the power source side contact is opened to the ground side contact. Insulation failure can be prevented without affecting.

According to another aspect of the circuit breaker of the present invention, the drive means includes a first drive member connected to the operation handle, and rotation driven by the drive of the first drive member to come into contact with the ground side movable contact. Since the second drive member having a non-circular shape having a different distance from the center is provided, the first drive member is interlocked with the opening / closing operation of the operation handle in addition to the effect according to claim 1 to claim 4, (2) The driving member can rotate to bring the ground-side movable contact into contact with and separate from the ground-side fixed contact, so that the operation handle can smoothly open and close the ground-side movable contact.

[Brief description of drawings]

FIG. 1 is a front view showing a circuit breaker of the present invention.

FIG. 2 is an exploded perspective view of the one shown in FIG.

FIG. 3 is a side view showing the state of FIG. 2 with the first cover removed.

FIG. 4 is a side view showing the state of FIG. 2 with the second cover removed.

FIG. 5 is a side view showing a state where the operation handle of the one shown in FIG. 3 is turned on.

FIG. 6 is a side view showing a state where the operation handle of the one shown in FIG. 4 is turned on.

FIG. 7 is a side view showing a state in which the contacts on the power supply side of FIG. 3 are forcibly opened.

FIG. 8 is a side view showing a state in which the power source side contacts of FIG. 4 are forcibly opened.

[Explanation of symbols]

 10 Power supply side contact 20 Ground side contact 30 Breaking mechanism 35 Operation handle 40 Driving means

Claims (5)

[Claims] 1. A power source side contact and a ground side contact interposed in each of the electric paths consisting of the power source side line and the ground side line, and an operation handle for opening and closing the power source side contact, and responding to an abnormality in the current flowing through the power source side contact. A circuit breaker including a disconnecting mechanism for forcibly opening the contacts on the power source side and a drive means for opening and closing the ground contact in accordance with the opening and closing operation of the operation handle. A circuit breaker, characterized in that the circuit breaker is a pressing and closing drive means for pressing and closing the ground side contact in accordance with the pole operation. 2. The circuit breaker according to claim 1, wherein the drive means opens and closes the ground-side contact on the opening side of the power-side contact closed position by the operation handle. 3. A drive restraining section for holding the ground side movable contact in a closed state when at least one of the operation handle and the driving means is forcibly opened at the power source side contact. The circuit breaker according to claim 1 or 2. 4. The circuit breaker according to claim 1, wherein a partition wall is interposed between the power source side contact and the ground side contact. 5. The non-circular shape in which the driving means has different distances from a first driving member connected to the operation handle and a rotation center which is rotated by the driving of the first driving member and abuts on the ground side movable contactor. 5. The circuit breaker according to any one of claims 1 to 4, further comprising: