JPH0810573B2 - Multi-pole circuit breaker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole circuit breaker configured by connecting a plurality of single-pole circuit breakers, and more particularly to improving the operability of a handle and connecting to another pole. Of the multi-pole circuit breaker suitable for improving the certainty of transmission of the trip motion of the above.

[Background of the Invention]

As described in Japanese Utility Model Application Laid-Open No. 54-57367, the conventional device is configured to connect a single-pole circuit breaker to form a multi-pole circuit breaker, but the connecting member connects only the tip of the handle. I was crying. Further, in order to interlock the tripping operation with the other pole, the operation portions of the operating plates provided independently of each other are engaged with the engaging portion of the connector rotatably sandwiched between the two poles. It was made to contact with the other pole and transmitted to the other pole.

Therefore, there is a problem in that there is a time lag in the opening / closing operation and the trip operation of each pole due to the twisting of the connecting member during the handle operation and the play between the connector and the operating plate during the trip, which is a problem in protecting the electric circuit.

Moreover, no consideration was given to the attachment of signal contacts to the circuit breaker and auxiliary devices such as auxiliary switches.

[Object of the Invention]

An object of the present invention is to provide a highly reliable multi-pole circuit breaker capable of effectively preventing the generation of a time difference between the opening / closing operation of each pole and the trip operation.

[Outline of Invention]

The present invention is directed to a fixed contact block having fixed contacts fixed thereto, a movable contact block having a movable contact fixed to one end to and from the fixed contact, and an overcurrent responsive means which is connected to the movable contact block and operates when an overcurrent occurs. A tripping member for tripping the movable contact base by the operation of the overcurrent responding means, a housing for storing the fixed contact base, the movable contact base, the overcurrent responding means and the tripping member,
A multi-pole circuit formed by connecting a plurality of single-pole circuit breakers, each of which is rotatably held around the center of rotation in the housing and has a handle having an operation portion provided at its tip end so as to project from the housing. The circuit breaker is rotatably held between the single-pole circuit breakers by including a detection unit that detects the operation of the trip member and a transmission unit that transmits the operation of the trip member to the overcurrent responsive means of the other pole. The interlocking member, a holding member that is rotatably held concentrically with the center of rotation at one end, and a connecting member that has an engaging portion that engages with the operating portion of the handle at the other end, The housing is configured to be connectable, and the housing has a fitting portion at which the holding portion is rotatably fitted at a position corresponding to the center of rotation, and the connecting member has the holding portion fitted to the fitting portion and has a single pole. It is rotatably held between the circuit breakers and the engaging part engages with the operating part. It is made configured to rotate the handle and integrally Te is characterized in.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

A first embodiment of the present invention will be described with reference to FIGS.

This embodiment shows an example in which three single pole circuit breakers are connected to form a three pole circuit breaker.

As shown in FIG. 2, inside a case 1 and a cover 2 which are formed by molding an insulating material, a fixed contact 8 fixed to a fixed contact base 7 and a movable contact 6 which comes in contact with and separates from the fixed contact 8 are provided at one end. The operation part is fixed and the other end is related to the support shaft 24 of the operation handle 3.
A movable contact base 5 rotatably supported by an engaging portion 3b formed at an end substantially symmetrical to 3a and a pin 20 provided above the fixed contact base 7 have one end rotatably supported by a shaft. A movable contact base which is supported and is formed in a substantially "C" shape, and the other end of which is engaged with the movable core 11 and is stretched between a substantially central portion of the movable contact base 5 and a substantially central portion of the hook 4. Spring 1 that gives rotational force to 5 and the hook 4
0, fulcrum 1 formed on case 1 and cover 2, respectively
The left and right engaging portions are rotatably supported by a and 2a, the cross section is formed into a substantially "J" shape, and the upper portion thereof is urged in the clockwise direction by the spring 12, and the inside of the lower portion of the "J" shape. Of the movable core 11 provided to engage the bimetal 13, the adjusting screw 15 for adjusting the operation amount of the bimetal 13, the fixed contact 8 below the case 1 and the cover 2, and the arc extinguishing provided near the movable contact 5. Device 17, Stopper 19 for restricting movement of movable contact base 5 when contacts are opened, Pin 2 along with movement of hook 4 during trip operation
Rotate counterclockwise around 1 to press the movable contact table 5 to accelerate the opening of the movable contact table 5, one end is connected to the bimetal 13, and the other end forms the secondary side terminal 2 Next conductor 1
4, The fixed core 16 fixed under the bimetal 13 is stored. Terminal screws 18 are screwed onto the terminal portions of the fixed contact stand 7 and the secondary conductor 14.

The operation handle 3 has an operation portion 3a formed on the upper side protruding from the upper surfaces of the case 1 and the cover 2, and rotation centers formed in substantially the central portions are formed on the case 1 and the cover 2, respectively, as shown in FIG. The bearing 24 is rotatably supported by the bearing 24.

The hook 4 is engaged at its free end with the movable core 11 and is urged by the spring 10 to rotate clockwise.

Next, the ON / OFF operation and the trip operation are shown in FIGS.
It will be described with reference to the drawings.

FIG. 3 shows the ON state, and FIG. 4 shows the OFF state. If the energizing current is less than the rated current, the tip of the hook 4 is the free end.
4a remains locked to the engaging portion 11a of the fixed core 11,
When the operating portion 3a of the operating handle 3 is rotated clockwise in the N state, the engaging portion 3b pivotally supporting the movable contact base 5 is splashed.
The movable contact 6 and the fixed contact 8 are separated from each other by the snap action and are turned off.

When an overcurrent flows, the tip of the bimetal 13 bends in the counterclockwise direction due to the juule heat generated by this current. The lower end of this bimetal 13 is
The movable core 11 is rotated counterclockwise about the fulcrums 1a and 2a by engaging with the inside of the lower portion of the "J" of 11 and increasing the curvature. By this rotation, the tip end 4a of the hook 4 is disengaged from the engaging portion 11a of the movable core 1, so that the hook 4 is moved by the spring 10.
It is biased by and rotates clockwise. By this rotation, the fulcrum of the spring 10 provided in the central portion of the hook 4 moves, exceeds the engaging position between the movable contact point 5 and the handle 3, and the movable contact point 5 rotates counterclockwise, The contact opening operation is performed and the state shown in FIG. 5 is reached.

When a large current such as a short circuit flows, the bimetal 13
The movable core 11 is attracted by the fixed core 16 located in the lower part of the bimetal 13 without waiting for the bimetal 13 to bend, and the contact opening operation is performed as in the case of the overcurrent. After the opening operation, the hook 4 and the movable contact base 5 come into contact with the upper side and the lower side of the stopper 19 formed on the case 1, respectively, and stop.

The above is the operation for the end pole, but in order to construct a multi-pole circuit breaker by connecting multiple single-pole circuit breakers in the lateral direction, opening / closing operation of the operating handle and tripping operation at overcurrent are required. It must be configured to occur very simultaneously.

In this embodiment, the trip operation of one pole is transmitted to the other pole by the following configuration (hereinafter referred to as "common trip". The common trip configuration in this embodiment will be described with reference to FIGS. 6 to 8. .

FIG. 6 shows the positions of the hook 4 and the movable core 11 before and after the trip operation.

In the figure, the solid line shows the positions of the hook 4 and the movable core 11 before the tripping operation and the two-dot chain lines show the positions after the tripping operation, respectively. Before tripping, the tip 4a of the hook 4
Engages with an engaging portion 11a formed in the substantially central portion of the movable core. When an overcurrent flows and the bimetal 13 is deformed, the movable core 11 rotates counterclockwise, the tip 4a of the hook 4 and the engaging portion 11a of the movable core 11 are disengaged, and the hook 4 causes the spring 4 to move.
Is urged to rotate clockwise around the pin 20 and contact the stopper 19 to complete the trip operation.

In this embodiment, the common trip is performed by detecting the movement of the hook 4 and transmitting it to the other pole.

The hook 4 is an arc part with a radius A centered on the pin 20 that serves as a fulcrum.
An arc portion 4c (C = A + δ) having a radius C continuous to the tip 4a side of the hook 4 of the arc portion 4b having the radius 4b and the radius A is formed on the inner peripheral side,
An arc portion 4b having a radius B (B> C) is formed on the outer peripheral side of the arc portion 4b having a radius A and the arc portion 4c having a radius C. In the present embodiment, the rotation of the hook 4 is detected by utilizing the dimensional difference δ of the inner circumference and is transmitted to the other pole. An opening for detecting the movement of the hook 4 is provided on the side surface of the case 1 and the cover 2 facing the other pole.
1b and 2b are provided, and openings 1c and 2c for transmitting the detected movement of the hook 4 to the movable core 11 of each pole are provided. Interlocking member 40 and
As shown in FIG. 8, reference numerals 41 are each formed in a substantially "U" shape, and a detection unit 42 for detecting the movement of the hook 4 and a movable core of each pole for detecting the movement of the hook 4 are provided at both ends of the "U" shape.
A transmission portion 44 for transmitting to 11 is provided in a protruding manner, and a pin serving as a center of rotation of the interlocking members 40 and 41 is provided at the bent portion of the "<" shape.
48 are projected on both sides. On the side surface of the cover 1 and the case 2 facing the other pole, the openings 1b and 2b and 1c and
A pin 48 is fitted in a substantially middle portion of 2c to form recesses 1d and 2d that are rotatably supported.

In the present embodiment, the interlocking member 40 is the base portion of the detection unit 42.
42a is formed to have a diameter larger than that of the detecting portion 42, and is configured to reinforce against the impact due to the movement of the hook 4, and the interlocking member 41 has the detecting portion 42 on one side of the base portion 42a.
A connecting portion 42b having the same diameter as that of the root portion 42a is projected on the other surface, and a connecting hole 46 into which the detecting portion 42 of the interlocking member 40 is fitted is formed at the tip end portion thereof.

When the circuit breaker has two poles, an interlocking member is placed between each pole.
It is only necessary to attach one 40, and when there are three or more poles, the interlocking member 40
It is only necessary to add the required number of interlocking members 41.
FIG. 7 shows a connection state of the interlocking member 40 and the interlocking member 41 in the case of three poles.

By connecting the interlocking members in this way, a common trip shaft is formed, and when the hook 4 of at least one pole is disengaged from the movable core 11 and rotated clockwise, the detection unit 42 is pushed downward and The interlocking member rotates counterclockwise around the pin 48, and the transmission portion 44 abuts and presses the movable core 11 of the other pole, rotating the movable core 11 of the other pole counterclockwise to move the movable core 11. And the hook 4 are disengaged, and the other pole is also tripped at the same time. After the trip operation of the hook 4, the detector 42 is held in contact with the circular arc portion 4b of the hook 4 having the radius A, so that the transmission portion 44 is also held in contact with the movable core 11 and pressed. . In this state, rotate the handle to the OFF direction,
When the reset operation is performed, the hook 4 rotates counterclockwise,
Since the pressing of the detection unit 42 is released, the common trip shaft
It will be free. As a result, the movable core 11 is biased clockwise by the spring 12 locked at one end to rotate.

Due to this rotational movement, the transmission portion 44 that was in contact with the movable core 11 is pushed, the common trip shaft rotates clockwise around the fulcrum 48, and returns from the trip state to the ON / OFF state position. The reset operation is completed.

Next, the connection of the handles will be described with reference to FIGS.

The connecting portion of the handle in this embodiment is the fixed contact base 7, the movable contact base 5, the overcurrent response means 13, and the trip member 11.
A single-pole circuit including a housing 1 and a housing 2 for storing a vehicle, and a handle 3 which is rotatably held in the housings 1 and 2 about a rotation center and has an operation portion 3a provided at a tip portion thereof so as to project from the housing. In a multipolar circuit breaker formed by connecting a plurality of circuit breakers, a connection having a holding portion that is rotatably held concentrically with a rotation center at one end and an engaging portion that engages with an operating portion of a handle at the other end. The housing includes a member, the housing has a fitting portion in which the holding portion is rotatably fitted at a position corresponding to the rotation center, and the connecting member has the holding portion fitted in the fitting portion, and the single-pole circuit breaker is provided. It is characterized in that it is rotatably held in between, and the engaging portion is engaged with the operating portion to rotate integrally with the handle. Specifically, the handle has a first engaging portion 3c formed on the operating portion and a second engaging portion 3e formed at a position corresponding to the center of rotation, and the connecting member has the first engaging portion. It has a third engaging portion 32 as an engaging portion that engages with the portion and a fourth engaging portion 34 as a holding portion that engages with the second engaging portion. The case 1 as a housing has a through hole 23 as a fitting portion into which the holding portion is rotatably fitted, at a position corresponding to the center of rotation, and the holding portion 34 of the connecting member 30 is attached to the fitting portion 23. It is configured to be fitted and rotatably held between the unipolar circuit breakers, and the engaging portion 32 is engaged with the operating portion 3a to rotate integrally with the handle 3.

In addition, the connecting member is formed in a substantially “A” shape, and the third engaging portion and the fourth engaging portion are interposed between the adjacent handles, and the third engaging portion and the fourth engaging portion are respectively the first engaging portion of the handle and the fourth engaging portion. It is characterized in that the handle is integrally connected by engaging with the second engaging portion.

In this embodiment, as shown in FIG. 9 and FIG. 10, the handle 3 of each pole has a square hole 3c as a first engaging portion formed on both side surfaces near the tip end portion thereof, which serves as a center of rotation. Circular recesses 3d are formed on both sides. The circular recessed portions 3d are bearing portions 24 provided on the case 1 and the cover 2 so as to project in a substantially cylindrical shape.
And the handle 3 is rotatably held. The circular recess 3d of the handle 3 is provided with a hole 3e as a second engaging portion at a position corresponding to the center of rotation. Further, through holes 23 are formed at positions corresponding to the rotation center of the handle 3 of the bearing portion 24 formed on the case 1 and the cover 2.

The connecting plate 30 which is a connecting member for connecting the handles between the adjacent poles is formed in a substantially "E" shape, and a third engaging portion that engages with the square hole 3c at both upper ends of the "E" shape. And a convex portion 34, which is a fourth engaging portion that engages with the hole 3e, is formed at both ends on the lower side of the letter "A".

In this embodiment, the convex portion 34 penetrates the through hole 23 to form a hole.
It is inserted into 3e and transmits the rotational movement of the handle 3 to the other pole. Further, the inner diameter of the through hole 23 is formed larger than the outer diameter of the convex portion 34. Therefore, the rotation of the handle 3 can be effectively transmitted to the other pole.
Even if the ON / OFF operation is performed, it is possible to reduce the difference in the operating time of the angular poles and reduce the friction between the through hole 23 and the convex portion 34.

The convex portion 34 does not necessarily have to be dried in the hole 3e, and as shown in FIG. 11, through holes formed in the case 1 and the cover 2 corresponding to the rotation center of the handle 3 respectively.
It may be pivotally supported on 23. According to this structure, the convex portion 34 can be short and the material cost can be reduced, and the precision of fitting the convex portion 34 and the hole 3e is not required, and the number of parts manufacturing steps can be reduced.

A second embodiment of the present invention will be described with reference to FIGS. 12 and 13.

In this embodiment, a round hole 3c 'which is a first engaging portion is formed on both side surfaces near the tip of the handle 3, and circular recesses 3d on both side surfaces of the portion serving as the center of rotation correspond to the center of rotation. A square hole 3e ', which is a second engaging portion, is bored at a position to be opened. Meanwhile, connecting plate
Corresponding to this, 30 is a cylindrical convex portion as a third engaging portion.
32 'and a convex portion 34' having a square cross section as a fourth engaging portion. According to the present embodiment, the rotation of the handle 3 can be effectively transmitted to the other pole, and at the time of transmitting the ON / OFF operation to the other pole via the connecting plate 30, the first engagement portion and the second engagement portion can be transmitted. It is possible to prevent stress concentration between joints and prevent damage to the handle during ON / OFF operation.

 A third embodiment of the present invention is shown in FIGS.

In this embodiment, a protrusion 32a having a sawtooth-shaped cross section is formed on the circumference of the protrusion 32 which is the third engaging portion of the connecting plate 30 in a direction perpendicular to the press-fitting direction, and the first engagement member formed on the handle. Square hole 3c
At the time of press-fitting, the top of the saw-toothed protrusion 32a elastically abuts the inner circumference of the square hole 3c so that the connecting plate 30 is locked to the handle 3.

According to this embodiment, since the coupling member and the handle are elastically engaged with each other, the precision of fitting the convex portion 32 and the square hole 3c is not required, and the number of man-hours for manufacturing the parts can be reduced.

A fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the connecting member is composed of the connecting frame 62 and the lever 60. A tapered portion 3f, which is a first engaging portion, is formed at the tip of the handle 3, and the case 1 and the cover 2 are formed.
Through holes 23 are formed in the side surfaces of the handle 3 at positions corresponding to the center of rotation of the handle 3. The lever 60 is formed in a substantially cruciform shape, and a convex portion 34 serving as a fourth engaging portion is formed on both surfaces of the lower end thereof. The upper portion 60a of the lever 60 is substantially flat and is fitted into a groove 62b formed in the connecting frame 62, so that the lever 60 and the connecting frame 62 are integrated. The connecting frame 62 is formed with a groove 62a that is a third engaging portion that engages with the tapered portion 3f at the tip of the handle 3. The tapered portion 3f of the handle 3, the upper portion 60a of the lever 60 and the connecting frame 62
The grooves 62a and 62b are fixed so that they will not easily fall off during use. The fixing method may be adhesion, friction by fitting, or the like, and further, a concavo-convex portion is formed between the tapered portion 3f, the lever upper portion 60a and the grooves 62a, 62b to connect the connecting frame 62 to the handle 3.
Alternatively, the lever 60 may be locked. Lever 60
The projecting portion 34 projecting from the handle 3 may be fitted into the hole 3e formed at the center of rotation of the handle 3, or may be pivotally supported by the through hole 23. In this embodiment, the connecting frame 62 and the lever 60 are formed as separate members, but they may be integrally formed in advance.

FIG. 17 shows an example in which the present embodiment is applied to a 2-pole circuit breaker, and FIG. 18 shows an example in which the present embodiment is applied to a 3-pole circuit breaker.

A fifth embodiment of the present invention will be described with reference to FIG. This figure shows the one in which the present embodiment is applied to a three-pole circuit breaker. In this embodiment, the connecting member is composed of the lever 64 and the pin 66. The handle 3 has a through hole 3g that is a first engaging portion formed near the tip portion thereof, and the lever 64 also has a through hole 64a that is a third engaging portion formed at the tip portion thereof. The tip of the lever 64 is sandwiched between the handles of the respective poles, and the convex portion 34, which is the fourth engaging portion provided on both sides of the lower portion, is the center of rotation of the handle 3, which is the second engaging portion. It is inserted into the hole 3e. The pin 66 is fitted into the through hole 3g and the through hole 64a,
Both ends of the pin 66 are deformed to be larger than the diameter of the through hole by caulking or the like to prevent the pin 66 from falling off. Through holes 3g and 64a
The inner diameter of the pin 66 is set to be slightly larger than the outer diameter of the pin 66, so that the pin 66 can be easily inserted and assembled during assembly, and the deviation of the operating time of each pole due to the knack during operation can be prevented.

A sixth embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, the lower end of the connecting member 30 is extended, and in addition to the convex portion 34, convex portions 34a are further projected on both side surfaces of this extended portion. Correspondingly, an engaging portion for engaging the convex portion 34a is provided below the center of rotation of the handle 3, and adjacent handles are connected at three points to ensure transmission of the movement of the handle. In this embodiment, the handle 3 is provided on the side surface of the case 1'and the cover 2'located between the poles.
An elliptical hole 25 formed on an arc having a radius from the center of rotation of the convex portion 34 to the convex portion 34a is formed.

 A seventh embodiment of the present invention will be described with reference to FIG.

In this embodiment, the connecting member and the handle are integrated. FIG. 22 shows the case of two poles, in which the convex portion formed on the handle 67 and the concave portion formed on the handle 68 are engaged with each other so that the handles of the respective poles move simultaneously.

The handle 67 has a connecting portion 67a that functions as a connecting member formed on the side opposite to the other pole of the tip portion, and a convex portion 67b that is a third engaging portion is formed at the tip portion thereof. In addition, a connecting portion 67c that functions as a connecting member is provided at the center of rotation of the handle 67.
And a convex portion 67d serving as a fourth engaging portion is formed at the tip of the connecting portion 67c.

On the other hand, the handle 68 has a first end on the side facing the other pole of the tip.
A concave portion 68a, which is the engaging portion, is formed, and a concave portion 68c, which is the second engaging portion, is formed at the tip of the connecting portion 68b projecting at the center of rotation. Through holes 1 "a and 2" a are formed at positions corresponding to the connecting portions 68b and 67c of the case 1 "and the cover 2" which are adjacent to each other between the two poles. Connecting part 68b
Is dried in the through-hole 1 "a, and its tip is provided near the surface of the case 1". The connecting portion 67c is inserted into the through hole 2 ″ a, and the convex portion 67d formed at the tip portion is provided so as to protrude from the surface of the cover 2 ″.

The recess 68a of the handle 68 is provided so as to be located in the vicinity of the extension surface of the surface of the case 1 ″, and the projection 67b of the handle 67 is provided so as to protrude from the extension surface of the surface of the cover 2 ″.

Since the present embodiment is configured as described above, the circuit breakers of the respective poles can be arranged adjacent to each other, and the protrusions and the recesses can be fitted to each other at the handle tip portion and the rotation center portion to perform the connection. You can reduce the score. Moreover, since the movement of the handle is transmitted to the other pole without passing through the inclusion, the movement of the handle can be transmitted to the other pole quickly and accurately. Although the present embodiment has been described for the case of two poles, a concave portion similar to the handle 68 is formed on the surface of the handle 67 opposite to the convex portion,
A circuit breaker with three or more poles may be configured.

An eighth embodiment of the present invention will be described with reference to FIGS. 23 and 24.

In this embodiment, a convex portion 43 is provided at one end portion of the interlocking member 40 or 41 provided between the poles, and the limit switch 50, which is an accessory device arranged between the poles, is rotated by the counterclockwise rotation during the common trip operation. The button 50a is pushed in. Thus, the trip operation can be taken out as an external signal, and a circuit breaker equipped with an alarm switch can be obtained.

It should be noted that grooves 1e and 2e, which are holding portions for holding the limit switch 50 and the lead wire 54, are provided in advance on the surfaces of the case 1 and the cover 2 which are the connecting surfaces.

A ninth embodiment of the present invention will be described with reference to FIGS. 25 and 26.

In this embodiment, the handle connecting member 30 provided between the poles is provided with a convex portion 30a extending below the rotary branch portion, and the convex portion 30a forms a groove 1e which is a holding portion between the case 1 and the cover 2. , 2e
Button 50 of limit switch 50 which is an accessory device held by
It is configured so that a is pushed in. As a result, it is possible to obtain a circuit breaker equipped with an auxiliary switch that turns ON / OFF the limit switch according to the rotation of the connecting member 30 accompanying the operation of the handle 3 and outputs the ON / OFF of the contact as a signal to the outside.

〔The invention's effect〕

According to the present invention, it is possible to effectively prevent the occurrence of an operation time difference in the switching operation or trip operation of each pole and to obtain a highly reliable multi-pole circuit breaker.

[Brief description of drawings]

FIG. 1 is a plan view of a multi-pole circuit breaker according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the configuration of the multi-pole circuit breaker according to the first embodiment of the present invention. 4 and 5 are front views showing the operation of the main part of the mechanical section during ON, OFF, and TRIP respectively, FIG. 6 is a front view showing the movement of the hook during tripping, and FIG. 7 is the present invention. FIG. 8 is a side view showing the positional relationship between the movable core and the interlocking member in the first embodiment, FIG. 8 is a perspective view showing the shape of the interlocking member in the first embodiment of the present invention, and FIGS. 9 and 10 are the present invention respectively. FIG. 11 is a perspective view and a side sectional view showing the relationship between the handle and the connecting member in the first embodiment, FIG. 11 is a side sectional view showing a modification of the handle and the connecting member in the present embodiment, FIGS. Is a perspective view and a sectional view showing the relationship between the handle and the connecting member in the second embodiment of the present invention. Plan, Figure 14, Figure 15, Figure 16
The drawings are, respectively, a front view of a connecting member in the third embodiment of the present invention, an enlarged view of an engaging portion, a sectional view showing an engaged state with a handle, and FIGS. 17 and 18 are respectively a fourth embodiment of the present invention. FIG. 19 is a perspective view of a multi-pole circuit breaker in an example, and a side sectional view showing an engaged state of a handle and a connecting member; FIG.
Side sectional views showing the engagement state of the handle and the connecting member of the multipolar circuit breaker in the embodiment, FIGS. 20 and 21 respectively show the engagement state of the handle and the connecting member in the sixth embodiment of the present invention. FIG. 22 is a side sectional view and a perspective view of the connecting member, FIG. 22 is a side sectional view showing an engaged state of the handle and the connecting member in the seventh embodiment of the present invention, and FIGS. 23 and 24 are respectively the eighth embodiment of the present invention. FIG. 25 is a side view and a front view showing the attachment state of the accessory device of the multi-pole circuit breaker in the embodiment, and FIGS. 25 and 26 show the attachment state of the accessory device of the multi-pole circuit breaker in the ninth embodiment of the present invention. It is a side view and a front view. 1e, 2e: holding part, 3: handle, 3c, 3c ', 3f, 3g, 68a: first engaging part, 3e, 3e', 23, 68c: second engaging part, 4: tripping member , 5: movable contact point, 6: movable contact, 8: fixed contact, 11: overcurrent response means, 30,60,62,64,66,67a, 67c: connecting member, 32,3
2 ′, 62a, 64a, 67b: third engaging portion, 34, 67d: fourth engaging portion, 40, 41: interlocking member, 42: detecting portion, 42b: connecting portion, 44: transmitting portion, 50 : Auxiliary device

Claims (1)

[Claims] 1. A fixed contact base having fixed contacts fixed thereto, a movable contact base having a movable contact fixed to one end fixed to the fixed contact at one end, and a movable contact base connected to the movable contact base to operate at an overcurrent. A current responsive means, a trip member that trips the movable contact base by the operation of the overcurrent responsive means, and a housing that stores the fixed contact base, the movable contact base, the overcurrent responsive means, and the trip member. A plurality of single-pole circuit breakers connected to each other, each of which has a handle which is rotatably held about a rotation center in the housing and has an operating portion provided at its tip end so as to project from the housing. In the multi-pole circuit breaker, a detection unit that detects the operation of the trip member and a transmission unit that transmits the operation of the trip member to the overcurrent response means of the other pole are provided between the single-pole circuit breakers. With the interlocking member that is rotatably held A connecting member having a holding portion that is rotatably held concentrically with the rotation center at one end and an engaging portion that engages with the operating portion of the handle is provided at the other end, and the interlocking member connects the detection portions to each other. The housing has a fitting portion in which the holding portion is rotatably fitted at a position corresponding to the rotation center, and the connecting member has the holding portion fitted in the fitting portion. It is combined and rotatably held between the single-pole circuit breakers, and the engaging portion is engaged with the operating portion to rotate integrally with the handle. Multi-pole circuit breaker.