JPS641892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a single-pole neutral circuit breaker equipped with a narrow, flat, and substantially parallelepiped shaped casing, which is symmetrical in a median plane perpendicular to the narrow surface of the casing. a control mechanism located on the casing, occupying the entire width of the casing, and comprising a manual control lever and an electromagnetic device for automatic tripping in the event of a short circuit; a single pole comprising a pair of phase contacts and a pair of neutral contacts juxtaposed in the middle, and an insulating partition parallel to the median plane and interposed between the phase contacts and the neutral contact. This relates to neutral circuit breakers.

Circuit breakers of the type described above are used in terminal wiring installations, in particular for protecting electrical circuits.
This circuit breaker is used in various devices to completely isolate the circuit by simultaneously interrupting the phase conductor and the neutral conductor in the open position. In the known modular system, the circuit breaker is made by a combination of two pairs of electrodes, which are protected together, or one of which is protected by the phase electrode and the other by the neutral electrode. is blocked. In either case, the number of modules is doubled, significantly increasing the volume and cost of the device.

The invention simplifies the disconnection device of the neutral conductor and is based on the recognition that circuit protection can be guaranteed by means of a phase disconnection device.

The simplification of such a neutral conductor interrupter is achieved by using the control mechanism of a phase interrupter for the actuation of this neutral conductor interrupter, and by using a width equivalent to a single pole casing or This is accomplished by combining the phase and neutral devices in the same casing with a pitch.

Width circuit breakers comprising two pairs of mutually insulated contacts for use as double-pole circuit breakers or as circuit-breakers with one pole protected by a neutral pole circuit-breaker are already known (French patent No. 2167302
issue). These two pairs of contacts and the corresponding isolation chambers are absolutely symmetrical, are of the same width, and the contacts open and close simultaneously. Considering the use for interrupting phase and neutral conductors, this device is not optimal.

The object of the present invention is to eliminate the above-mentioned drawbacks, and in the circuit breaker according to the present invention, the partition, together with the large side of the casing, separates a first storage chamber for the phase contact and a second storage chamber for the neutral contact. In order to define, in the extended area of the electric arc that occurs between these contacts,
As a result of this lateral offset of the partition, the volume of the first chamber is greater than the volume of the second chamber.

The control mechanism and the tripper of the pole to be protected occupy the entire width of the casing, and only the lower part of the casing is divided into two chambers, a first chamber and a second chamber, for receiving the neutral contact and the phase contact.

According to another feature of the invention, if the neutral and phase contacts are made different, it is important that in the event of a short circuit, the phase contact opens first, and also the neutral contact first closes, and both contacts open almost simultaneously. It is. In this way opening delays, which are detrimental to rapid shutoffs, can be avoided.

According to a development of the invention, the phase movable contact and the neutral movable contact are fixed at the ends of the phase contact arm and the neutral contact arm, respectively, of insulating material rotatably mounted on a common axis. The opening delay of the neutral contact is implemented by extending the neutral contact arm and inserting additional play between this contact arm and the common control mechanism.

Control of the thermal trip of the circuit breaker is preferably carried out by means of an adjustment screw accessible from the outside of the circuit breaker casing, which screw screws into a threaded hole made in the plastic wall of the casing. It will be done. Such screwing into plastic material does not require nuts and, according to an important refinement of the invention, this screw hole is located in a recess on the fastening surface of the casing, preferably receiving a removable fastening lock. so that it opens inside. With this lock in place, the control screw is hidden and changes to the adjustments made during manufacture are prevented.

For each contact pair, a breaking chamber is provided with two electrodes or arc contacts facing each other. The minimum separation area or net of these electrodes is
The contacts are provided at a remote location to prevent re-discharge on the contacts. It is also desirable that the commutation of the arc generated on the phase contact to the arc contact be delayed relative to the commutation of the arc anchored on the neutral contact. This is to prevent the electromagnetic tripper and associated extractor from leaving the circuit prematurely, and also to neutralize the arc, since the neutral contact has no resistance to the action of the arc. This is because it is necessary to quickly move from the contact to the electrode to reduce fatigue of the neutral contact. The neutral contact arm and the phase contact arm are mounted on opposite sides of a plate-like support cast from Zanak alloy, from which the shaft and stopper are formed by casting. Manufacturing and assembly are thus greatly simplified.

Embodiments illustrating the present invention will be described in detail below with reference to FIGS. 1 to 9.

In these figures, a molded casing 10 of insulating material has two halves 12, 14 held together by rivets 16. This casing 10 has a generally parallelepiped shape with a small width that can be compatible with the modular system of the product name Multi9. This casing 10 has a bottom surface 18 fixed on a symmetrical DIN rail and a front surface 20 with an insertion hole for a control lever 22. A pair of power supply terminals 26 and 28 arranged inside the casing 10 are arranged on one side 24 of the narrow sides,
The output surface 30 on the opposite side of the side surface 24 has a pair of output terminals 32 and 34 arranged side by side. The width of the casing 10 corresponds to the width of the single-pole circuit breaker of the above-mentioned modular system, and has a width of 9 mm2 pitch, that is, a width of 18 mm.

Both terminals 26, 32 belong to a neutral cutoff circuit arranged inside the casing 10, and terminals 28, 34
belongs to the phase cutoff circuit also arranged inside the casing 10. Between the halves 12 , 14 an insulating partition 36 extends substantially parallel to the large side of the casing 10 . This partition 36 is interposed between the neutral cutoff circuit and the phase cutoff circuit and separates them (sixth
figure). The partition 36 has peripheral portions 38 and 40 at both ends thereof.
have. One peripheral portion 38 is connected to the power supply terminal 2
6 and 28, and parallel to the large side surface of the casing 10.
It extends along the median plane of Further, the other peripheral portion 40 is disposed between the output terminals 32 and 34 and extends along the median plane of the casing 10 in parallel to the large side surface of the casing 10. The center part 42 of the partition 36 is the casing 10
The interior of the casing 10, which is disposed upwardly in FIG. 6 and close to the bottom surface 18, is divided into two chambers 44 and 46 having different thicknesses. The chamber 44 located between the terminals 28 and 34 on the phase cutoff circuit side is thicker. The partition 36 extends inside the casing 10 toward the bottom surface 18 and separates the elements belonging to the neutral cutoff circuit and the phase cutoff circuit, respectively.

By the way, a power supply circuit having two wires, a phase conductor and a neutral conductor, can be protected by simply cutting off the phase conductor. However, in order to completely isolate the supply side circuit from the power supply side, it is safer to also interrupt the neutral conductor.

In this embodiment, as will be described later, the pair of phase contacts 58 and 62 are first opened, and then the pair of neutral contacts 48 and 50 are opened. That is, first, phase contacts 58 and 62 open, and an electric arc is generated between these contacts 58 and 62. As soon as the electric arc is extinguished in the chamber 44 in which the phase contacts 58, 62 are located, the current between the contacts is interrupted. Thereafter, neutral contacts 48, 50 open. However, since the current is already completely or at least partially interrupted by the opening of the phase contacts 58, 62, no electrical arc occurs or only a small electrical arc occurs.

Therefore, the neutral chamber 46 housing the neutral contacts 48, 50 is the same as the chamber 4 housing the phase contacts 58, 62.
It may be smaller than 4. Therefore, by shifting the partition 36 to the side, a large room 44 can be created.
and a small chamber 46 can be arranged within the limited width of the casing 10, making it possible to accommodate the phase cut-off device and the neutral cut-off device in the casing 10 of the same width as the single-pole circuit breaker.

Elements that act in common on both circuits, particularly a control mechanism and a contact tripping mechanism described later, are arranged in a common part of the inside of the casing 10 on the front side 20 where the partition 36 is not provided. There is.

Referring to FIG. 3, which shows the neutral circuit, the power supply terminal 26 has a fixed contact 48 . This fixed contact 48 cooperates with a neutral movable contact 50 provided on an insulated contact arm 52 pivotally mounted on a shaft 54 . An arc contactor 49 extends from the fixed contact 48 toward the output terminal 32, and this arc contactor 49
extends inside the neutral chamber 46, facing the electrode 51 disposed on the output terminal 32 side of the movable contact 50. The electrode 51 is connected to the output terminal 32 on the one hand.
On the other hand, it is connected to the movable contact 50 via a braided wire 56. Power supply terminal 2
6, fixed contact 48, movable contact 50, braided wire 56,
Output terminal 32, arc contact 49 and electrode 51
The neutral cutoff circuit consists of a neutral chamber 46 defined by the partition 36 and the half 12 of the casing 10.
is located inside. The arc contactor 49 and the electrode 51 are arranged so that the distance between them increases toward the output terminal 32 from the minimum distance point or net 53 immediately after the movable contact 50 in the open state.

FIG. 2 shows a phase cut-off circuit which includes a feed terminal 28, a stationary contact 58 connected to the feed terminal 28 on the one hand and extended to the arcing contact 60 on the other hand, and a fixed contact 58 pivoted on an axis 54. A phase movable contact 62 is provided on a freely mounted contact arm 64 of insulating material. The phase movable contact 62 is connected to the electromagnetic circuit breaker 70 by means of a braided wire 66.
is connected to the input side of the winding 68 of. The output of this winding 68 is connected to the bimetal 7 by means of a braided wire 72.
4, and this bimetal 74 is connected to output terminal 3.
Connected to 4. An electrode 76 is arranged on the output terminal 34 side of the phase movable contact 62 so as to face the arc contact 60 , and this electrode 76 is connected to the output terminal 34 . Power supply terminal 28, fixed contact 58,
Arc contactor 60, electrode 76 and output terminal 34
The phase cut-off circuit part consisting of is arranged in a space limited by the partition 36 and the housing half 14, ie in a chamber 44 forming an arc cut-off chamber. The arc contactor 60 and the electrode 76 have a structure in which the distance between them converges toward the output terminal 34 and then widens.
4, that is, in a direction toward the output terminal 34. Therefore, the phase movable contact 6
2 separates from the fixed contact 58, this net 77
It takes time for the phase shift contact 62 to approach the electrode 76, thus delaying the commutation of the arc from the phase movable contact 62 to the electrode 76.

By the way, when an excessive current occurs, the current flows from the power supply terminal 28 through the phase contacts 58 and 62, through the winding 68 and the bimetal 74, and to the other output terminal 34. This current pulls extractor 118 back through winding 68, quickly releasing phase contact 62 from stationary contact 58. When the phase movable contact 62 comes close to the electrode 76, the arc commutates from the phase movable contact 62 to the electrode 76. The current then flows to the power supply terminal 28 and the arc contactor 6.
0 through electrode 76 to output terminal 34 .
The winding 68, which is no longer energized, then releases the extractor 118 and the phase movable contact 62
moves to the closed position. To prevent such a contact re-closing, a contact opening mechanism consisting of the mooring device 106, lock 102, shaft 92, plate-like support 78, etc. is actuated before the contact re-closes;
The phase movable contact 62 must be held in the open position.

In contrast, in this embodiment, as described above, the commutation of the arc from the phase movable contact 62 to the electrode 76 can be delayed, so the contact opening mechanism can be operated reliably during this time, and the contact can be re-opened. Closure can be prevented.

On the other hand, the convergence part in which the arc contactor 60 and the electrode 76 converge as they move from the power supply terminal 28 side toward the net 77 moves the arc to the phase movable contact 62 after the phase movable contact 62 is separated from the fixed contact 58 by a predetermined distance. It is possible to reliably migrate from the contact point to the net 77 and reliably separate it from the contacts 62 and 58.
In addition, the distance between the net 77 and the contacts 58 and 62 is
Since the spacing is smaller than that of net 77
The arc that has moved upward can be prevented from re-discharging on the contacts 58, 62.

As shown in FIG. 3, an extractor 118 is provided at the axial center of the electromagnetic circuit breaker 70.
This extractor 118 has contact arms 52,
64. When an excessive current flows through the winding 68, the extractor 118 is attracted and the contacts 50 and 62 are opened. Further, an iron core 112 is provided on the output terminal 34 side of the electromagnetic breaker 70. Then, when an excessive current flows through the winding 68, the iron core 112
It protrudes to the left in FIGS. 3 and 3, and rotates the mooring device 106 to operate a drive/lock device to be described later. Furthermore, bimetal 74
The upper end of the mooring device 106 also moves to the right in FIG. 2 due to the excessive current, rotating the mooring device 106 and operating a drive/lock device to be described later.

In FIGS. 2 and 3, the control mechanism located in the upper portion of the partition 36 of the casing 10 is commonly used for the phase movable contact 62 and the neutral movable contact 50. Respective contact arms 64,5
2 are pivotally supported by a pivot shaft 54, and are designed to be able to rotate individually around the pivot shaft 54. This pivot shaft 54 is connected to the plate-like support 7
Supported by 8. This plate-like support 78 is pivotally mounted on a fixed shaft 80 .
0 is connected to the halves 12, 14 of the casing 10. The contact arms 52, 64 are provided with a passage slot 82 through which a shaft 80 passes.
2, these contact arms 52, 64 can be swung in a limited manner on a plate-like support 78. Further, the helical spring 84 is connected to the contact arms 52 and 6.
4 counterclockwise around the shaft 54 as shown in FIGS. 2 and 3, the contacts 48, 50; 58, 6
It is fired in the closed position of 2. The spring 86 holds the plate-like support 78 about the axis 80 at the contacts 48, 5.
0; in the opening direction of 58 and 62, it bounces in the clockwise direction in FIG. In order to rotate the neutral movable contact 50 and the phase movable contact 62 towards the open position, the plate-like support 78 has stops 88 which cooperate with the ends 90, 91 of the contact arms 52, 64. The plate-shaped support 78 is
Cooperates with drive/lock device.

This drive/locking device consists of a plate-like support 7
8, link 96, control lever 22, lock 10
2 and a mooring device 106. The plate-like support 78 is formed with a dowel-like slot 94 as shown in FIG. This slotted slot 94
is a part formed in the circumferential direction with respect to the fixed shaft 80, and a part formed in the circumferential direction with respect to the fixed shaft 80.
It has a key-shaped part formed in a direction that is spaced apart from the main body. A shaft 92 formed by bending one end of a link 96 is fitted into the slotted slot 94 . The other end of the link 96 is connected to a hole 98 in the control lever 22. The control lever 22 is rotatably supported on the rotating shaft 100 and biased counterclockwise by a spring 116.

On the other hand, the slotted slot 9 of the plate-like support 78
A lock 102 is disposed near 4.
This lock 102 is rotatably supported by a fixed shaft 103 fixed to the casing 10, and is biased counterclockwise by a helical spring 114. The stop surface 104 of this lock 102 is connected to the shaft 92.
This is to prevent the metal from entering the circumferentially formed portion of the slotted slot 94. The lock 102 engages a mooring device 106 which is pivoted on a fixed shaft 110. This mooring device 106 also has a helical spring 114.
is biased counterclockwise by. This mooring device 106 has a mooring lever 108, and this mooring lever 108 is in contact with the bimetal 74. Then, when the bimetal 74 is activated and its upper end moves to the right in FIG. 2, the mooring device 106
is designed to rotate clockwise. Also,
The end of the mooring device 106 on the opposite side of the mooring lever 108 is brought into contact with the iron core 112 of the electromagnetic circuit breaker 70, and when the iron core 112 is moved to the left in FIG. 2, the mooring device 106 is rotated clockwise. It's getting old.

The support plate 78 is, for example, a cast part made of Zanak alloy. Further, the shaft 54, fixed shaft 80 and stopper 88 are formed on the plate-shaped support 7 by casting.
8 and protrudes from both sides of the plate,
Makes assembly easy.

Next, the operation of the mechanical parts of this circuit breaker will be explained. Plate-shaped support 78 of circuit breaker, link 9
6. In the contact closed state of the control lever 22,
It is held in the position shown in FIG. The reason for this will be explained. The shaft 92 of the link 96 is prevented from entering the circumferentially formed portion of the dowel-shaped slot 94 by the stop surface 104, and as shown in FIG. It is held in a key-shaped portion of the slot that is formed in a direction away from the fixed shaft 80. In this state, the plate-like support 78, the link 96, the control lever 22
is a fixed shaft 80, a shaft 92, a hole 98, and a rotating shaft 100.
Construct a four-bar link that connects the .

By the way, the force of the spring 86 that biases the plate-shaped support 78 is equal to the force of the spring 1 that biases the control lever 22.
Much larger than the power of 16. Therefore, the force trying to rotate the plate-like support 78 clockwise is greater than the force trying to rotate the control lever 22 counterclockwise. Further, the position of the hole 98 is located on the left side of the line connecting the rotating shaft 100 and the shaft 92 in FIG. Therefore, the strong force of the spring 86 is applied via the four-bar link mentioned above,
Control lever 22 is biased clockwise. However, since the knob portion of the control lever 22 is in contact with the casing 10, the control lever 22 cannot be rotated any further. In this way, the plate-like support 7
8, link 96, and control lever 22 are held in the position shown in FIG.

To manually open the contact from this state, the control lever 22 may be rotated counterclockwise. When the control lever 22 is rotated counterclockwise, the position of the hole 98 becomes to the right in FIG. 2 of the line connecting the rotating shaft 100 and the shaft 92, and the position exceeds the dead center.
Therefore, thereafter, the control lever 22 is rotated counterclockwise by the force of the springs 86, 116, and the plate-shaped support 78 is rotated clockwise. During this rotation of the plate-like support 78, the stopper 88 moves the ends 90, 9 of the contact arms 52, 64.
1 to move these contact arms to the open position. Note that during this movement, the mooring device 106 and the lock 102 are held in the position shown in FIG. 2, and the shaft 92 moves up and down along the stop surface 104. Furthermore, when the operating lever 22 is rotated clockwise in the opposite direction, each member moves in the opposite direction to the case where the contacts are opened, returning to the state shown in FIG. 2.

Next, the automatic opening operation will be explained. When an excessive current flows through the power supply terminal 28, the fixed contact 58, the phase movable contact 62, the winding 68, the bimetal 74, and the output terminal 34, the upper end of the bimetal 74 moves to the right in FIG. The iron core 112 moves to the left by the electromagnetic force. The mooring device 106 rotates clockwise due to the movement of the bimetal 74 and the iron core 112, and the lock 102 is rotated clockwise.
is released and rotates clockwise.

Here, the reason why the lock 102 rotates clockwise will be explained. An upward force is applied to the shaft 92 along the link 96 by the plate-like support 78, and as a reaction force, the shaft 92
applies a downward force to the stop surface 104 in the direction along the link 96. Therefore, a diagonal force is applied to the stop surface 104, and this force applies a clockwise force to the lock 102. Since this force is greater than the counterclockwise force exerted by helical spring 114, lock 102 is biased clockwise as long as it remains in the condition shown in FIG.

When lock 102 rotates clockwise, shaft 92
enters the recess below the stop surface 104, and the third
It enters into the portion of the slotted slot 94 shown in the figure that is formed in the circumferential direction. Then, the plate-shaped support 78 becomes rotatable in the circumferential direction, and is rotated clockwise by the force of the spring 86. As a result, contact arms 64, 52 rotate and open the contacts. Also, since the shaft 92 enters the circumferentially formed portion of the dowel-like slot 94 and is no longer held by the plate-like support, the control lever 22 is rotated counterclockwise by the force of the spring 116. The link 96 rotates, and the link 96 also moves upward. At this time, the shaft 92
moves upward in the dowel-like slot 94 and reenters the hook-shaped portion of the dowel-like slot that protrudes in the direction away from the fixed shaft 80 . Therefore, the lock 102 is rotated counterclockwise by the force of the helical spring 114 and returned to the position shown in FIG. The positional relationship of each component at this point is the same as the positional relationship when the contacts are opened manually. Thereafter, to close the contact, the control lever 22 may be rotated clockwise in the same manner as in the case of manual closure, and the operations of the various parts in this case are the same as in the case of manual closure.

The windings 68 are arranged in a common space and occupy the entire width of the casing 10 (see FIG. 7).
The iron core 112 of this winding 68 is the extractor 11
8, which extractor 118 cooperates with the contact arms 52, 64 to move the contacts 50, 62 to the open position upon detection of a short circuit.

As shown in FIGS. 2 and 3, the neutral contact arm 52 extends downward from the phase contact arm 64, and connects the phase movable contact 62 and the neutral movable contact 5.
The height of 0 is shifted (see Figure 8). That is, the distance between the neutral movable contact 50 of the neutral contact arm 52 and the shaft 54 is greater than the distance between the phase movable contact 62 of the phase contact arm 64 and the shaft 54. Therefore, the distal end 90 of the neutral contact arm 52
The distance between the phase contact arm 64 and the stopper 88 is
is larger than the distance between the end 91 of the stopper 88 and the stopper 88. Thus, when the plate-like support 78 is pivoted clockwise, the stop 88 first strikes the distal end 91 of the phase contact arm 64, moving it into the open position, and then the neutral contact arm 52. distal end 90 of the neutral contact arm 52 to move it to the open position. Similarly, when the plate-shaped support 78 is rotated counterclockwise, first the neutral movable contact 50 abuts the fixed contact 48 and then the phase movable contact 62 abuts the fixed contact 58. In this way, the neutral contact arm 52 is connected to the phase contact arm 6.
4, so the stopper 88
and the shaft 54 can be shared by the contact arms 52 and 64, thus simplifying the structure. In addition, by rotating the plate-like support 78 using the operation lever 22, the phase contact 5 can be adjusted.
8, 62 can occur before the opening of neutral contacts 48, 50, and vice versa.
The closure of 8,50 can occur before the closure of phase contacts 58,62. By the way, let us consider the case where the phase contacts 58, 62 and the neutral contacts 48, 50 are opened at the same time. In that case, arcing occurs not only between phase contacts 58, 62 but also between neutral contacts 48, 50. Therefore, the material and size of both of these contacts must be such that they can withstand the behavior of the arc. This increases the manufacturing cost and size of such circuit breakers. In contrast, in this embodiment, the phase contacts 62 and 58 are opened first, so that the arc flows through these contacts 62 and 58.
58, or primarily between these contacts. Conversely, when closing the circuit breaker, the neutral contacts 48, 50 close first. However, since the phase contacts 58, 62 are still open and the circuit is broken, no current is flowing. Therefore,
Even if the neutral contacts 48, 50 are closed, no arc will occur. Thereafter, an arc may occur between the phase contacts 58, 62 as they close. Since there is a time lag between the opening and closing timing of the phase contact and the neutral contact, there is a gap between the neutral contacts 48 and 50 not only when the circuit breaker is opened but also when it is closed.
No arc or only a small arc occurs. Therefore, it is not necessary to use special materials for the neutral contacts 48, 50, and costs can be reduced. Furthermore, the size of the contacts can be reduced, and the entire device can be made smaller.

On the other hand, when the short circuit is opened, the extractor 118
acts simultaneously on both movable contacts 50, 62, resulting in an immediate double interruption.

The movable contacts 50, 62 are arranged on their respective contact arms 5 in order to maximize the insulation spacing of these contacts.
2 and 64.

Due to the rational construction of the invention, it is possible to arrange the neutral disconnection device and the phase disconnection device in a casing with a profile and standard width corresponding to a single-pole circuit breaker. Therefore, the single-pole circuit breaker used in existing facilities can be easily replaced with the circuit breaker of this embodiment.

To explain Figure 2 in more detail, the bottom surface 1
8 is provided with an adjustment screw 122. This adjustment screw 122 is used to finely adjust the bimetal 74, and by rotating the screw, the pressing force of the support 120 of the bimetal 74 is changed, thereby adjusting the upper end of the bimetal 74. The position in the left and right directions in Figure 2 can be adjusted. Since this adjustment screw is provided on the bottom surface 18, the narrow output surface 30 can be used for the placement of the output terminals 32,34. Furthermore, if the casing 10 is mounted with its bottom surface 18 fixed on the DIN rail, it will no longer be possible to adjust the adjustment screw 122, so the adjustment screw 122 will no longer be able to be adjusted.
22 can be prevented from being rotated.

It should be noted that the threaded hole of this adjustment screw 122 preferably opens into a recess 126 for receiving a fixing lock (not shown) which is located after assembly of the casing halves 12, 14 and adjustment of the device. This storage section 12
By engaging the lock in 6, the bimetal adjustment point can be occluded and subsequent adjustments can be prevented.
Such a structure can save the closing plug of the adjustment screw 122 and the fixing nut of the adjustment screw 122.

The power supply terminal 26 on the neutral circuit side is shifted downward with respect to the power supply terminal 28 on the adjacent phase circuit side.
This height offset allows for connections to respective phase and neutral charged tips, ie, straight connection strips, which connect multiple modules laterally glued to the same support rail. terminal 26
The height deviation between and 28 corresponds to the height deviation of the movable contacts 50 and 62, which facilitates rational arrangement of the conductors. Output terminal 3 for receiving the output cable
2, 34 are preferably arranged on the same level, but within the spirit of the invention, these output terminals can also be offset with respect to each other.

[Brief explanation of drawings]

1 is a plan view of a circuit breaker according to the invention; FIG. 2 is an elevational view of the circuit breaker of FIG. 1 with the side walls of the casing removed and the phase contacts shown in the closed position; FIG. 1 is a cross-sectional view taken along the - line in FIG. 1, with the partition removed and showing the neutral contact in the closed position, FIG. 4 is a left side view of the circuit breaker according to the invention, and FIG. 2 or 3, and FIG. 6 is a sectional view taken along the line - of FIG. 2 or 3.
A cross-sectional view along the line, Figure 7 is the same as Figure 2 or 3.
8 is a detailed view showing each contact during opening, and FIG. 9 is a diagram of the operation of the circuit breaker of the present invention. 10...Casing, 18, 20, 24, 30
... Side of the casing, 22 ... Control lever, 3
6...Inner partition, 44...1st room, 46...2nd room
Chamber, 48, 50... Neutral contact, 58, 62... Phase contact, 52... Neutral contact arm, 64... Phase contact arm, 60, 76; 49, 51... Arc contact, 78... Pivoting plate, 70... Electromagnetic device, 77... Network, 54, 80, 88... Axis,
74...bimetal, 122...control screw.

Claims (1)

[Claims] 1 Narrow flat parallelepiped molded casing 10
in a single-pole neutral circuit breaker having narrow surfaces 18, 20, 24, 3 of said casing;
a control mechanism arranged symmetrically in the median plane perpendicular to 0 and occupying the entire width of the casing and having a manual control lever 22 and an electromagnetic device 70 for automatic tripping in the event of a short circuit; a pair of phase contacts 5 controlled by said control mechanism and juxtaposed in said casing;
8, 62 and a pair of neutral contacts 48, 50, and an insulating partition 36 interposed between the phase contact and the neutral contact in parallel to the middle surface, The partition 36, together with the large surface of the casing, separates the first storage chamber 4 of the phase contacts 58, 62, respectively.
4 and a second containment chamber 46 of the neutral contacts 48, 50, this partition 36 is offset laterally with respect to the median plane in the extension area of the electric arc generated between the contacts. A circuit breaker characterized in that as a result of the lateral offset, the volume of the first chamber 44 is larger than the volume of the second chamber 46. 2 Narrow flat parallelepiped molded casing 10
in a single-pole neutral circuit breaker having narrow surfaces 18, 20, 24, 3 of said casing;
symmetrically arranged in the median plane perpendicular to 0 and occupying the entire width of the casing, a manual control lever 22 and an electromagnetic device 70 for automatic tripping in the event of a short circuit.
a control mechanism having a control mechanism, and a pair of phase contacts 5, both controlled by the control mechanism and juxtaposed in the casing.
8, 62 and a pair of neutral contacts 48, 50, wherein rocking of said control lever 22 from the closed position toward the open position causes the phase contacts 58, 62 to open, which in turn causes the neutral contacts to open. 48, 50 and the swinging of the control lever 22 in the opposite direction first causes the neutral contact 4 to open.
8, 50, which in turn causes the closure of the phase contacts 58, 62, and upon tripping of the contacts in the event of a short circuit, said electromagnetic device 70 activates the extractor 118, which extractor moves the movable phase contact 62.
and the movable neutral contacts 50 to accelerate the movement of these movable contacts to the release position. 3. The movable phase contact 62 and the movable neutral contact 50 are respectively connected to contact arms 64, 52, which are connected to the axis 54 of a common pivot support 78 that is swingable between open and closed positions. The contact positions of the phase contacts 58, 62 and the neutral contacts 48, 50 are the same as the neutral contact 4.
The phase contacts 58, 62 are opened before the contacts 8, 50 are opened, and the neutral contacts 48, 50 are closed before the phase contacts 58, 62 are closed. A circuit breaker according to claim 1 or 2. 4. A circuit breaker according to claim 3, characterized in that the contact arm 64 of the movable phase contact 62 is shorter than the contact arm 52 of the movable neutral contact 50. 5 The pivot support 78 is a plate casting,
This plate is interposed between the contact arms 52, 64 and has a shaft 5 formed by casting.
4. The circuit breaker according to claim 3 or 4, characterized in that it has a fixed shaft 80 and a stopper 88. 6 a thermal tripper with a bimetal 74;
Claim 1, wherein the adjusting screw 122 is screwed into a screw hole opened in a portion of the narrow fixing surface of the molded casing 10 that receives the fixing lock. A circuit breaker according to any one of items 5 to 5. 7. Claims 1 to 7, characterized in that a pair of arc contacts 60, 76 are associated with a pair of phase contacts 58, 62 to capture the electric arc and direct it away from the contact area. A circuit breaker according to any of Clause 6. 8. A pair of arc contacts 49, 51 are combined with a pair of neutral contacts 48, 50 in order to capture the electric arc generated between the neutral contacts at the same time as it occurs and move it away from the contact area. A circuit breaker according to claim 6, characterized in: 9 Said arc contactor 60, 76; 49, 51
Claim 1 is characterized in that the electric arc commutation occurring between the neutral contacts 48 and 50 intervenes before the electric arc commutation occurring between the phase contacts 58 and 62. Circuit breakers according to Clause 7 or Clause 8.