JP3089278U - Dual contact type 4-pole circuit breaker - Google Patents

Abstract

(57) [Problem] To provide a double-contact type four-pole circuit breaker capable of improving safety and reliability at the time of circuit connection and disconnection between a power supply and a load. SOLUTION: Three first and third fixed contacts for supplying three-phase AC power to a load, one second fixed contact for connecting to ground, and the three-phase AC Three pairs of contacts, each having a pair of contacts movable to positions that contact or separate from corresponding contacts of the first and third fixed contacts to make or break connections between a power supply and a load. No.
(1) The movable contact can be moved to a position where it contacts or separates from the contact of the second fixed contact, and its movement angle electrically connects the contact of the first fixed contact and the contact of the third fixed contact. Or a second movable contact that is smaller than the moving angle of the first movable contact when moving to the separating position, and a holder that supports the first and second movable contacts so that they are simultaneously driven. Constitutes a double-contact type 4-pole circuit breaker.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a dual-pole type 4-pole (4 Poles) circuit breaker. More specifically, a grounded neutral pole contact comes in contact with each of the other pole contacts before connecting the circuit. The present invention relates to a two-contact type four-pole circuit breaker that can be separated later than other pole contacts at the time of breaking to ensure the reliability and safety of the breaker.

[0002]

[Prior art]

 In general, circuit breakers are designed to convert fault currents (short circuits, ground faults and charging currents) generated from electric circuits such as industrial power distribution circuits from load devices and line devices such as motors, electric and electronic devices, etc. This device is installed between the load device and the power supply to protect the device.

[0003] Circuit breakers used for industrial purposes are usually used for supplying or interrupting three-phase AC power to a load. Each circuit breaker includes a contact for opening and closing a circuit of the power supply and the load. Three fixed contacts and three movable contacts are mounted for each phase. Such a circuit breaker is called a three-phase circuit breaker or a three-pole circuit breaker. In the case of a circuit breaker additionally provided with a fixed contact and a movable contact for grounding the power supply and the load circuit as described above, such a circuit grounding contact is called a four-pole circuit breaker. Is called a neutral pole contact.

On the other hand, a double-contact type circuit breaker is a circuit breaker having two movable contacts and two fixed contacts for each phase. An arc generated when a circuit is opened and closed is shared by the two contacts. And a circuit breaker having a high breaking capacity.

As shown in FIG. 9, a conventional double-contact type four-pole circuit breaker includes three fixed contacts connected to a three-phase AC power supply and one fixed contact connected to ground. First fixed contactor 104, four second fixed contacts 102 connected to the load, and rotatably mounted between the first fixed contact 104 and the second fixed contact 102. Then, the four movable contacts 106 that can contact with or be separated from the first and second fixed contacts 104, 102 and the main body 113 of the circuit breaker are rotatable. A holder 116 for supporting the four movable contacts 106 so as to rotate simultaneously, a link mechanism 108 connected to the holder 116 for driving the holder 116 to rotate, and When an overcurrent is detected, the trip actuator unit 11 that operates the link mechanism unit 108 to cut off the circuit. 0, a switch lever 112 for manually switching the position of the circuit breaker to a circuit connection (ON) or circuit interruption (OFF) position, and a contact area around the first and second fixed contacts 104, 102 and the movable contact 106. And an arc-extinguishing unit 114 that extinguishes an arc generated at the time of contact or separation between the first and second fixed contacts 104 and 102 and the movable contact 106.

The four movable contacts 106 are connected to the holder 116 by pins (not shown) and are supported by the holder 116. Since the connection and support structure between the four movable contacts 106 and the holder 116 is similar to the corresponding structure of the circuit breaker according to the present invention, the structure of the four movable contacts and the holder according to the present invention is used. 4 can be referred to as a bottom view. That is, as shown in FIG. 4, the portion indicated by reference numeral 36 corresponds to the holder 116, and the portions indicated by reference numerals 38 and 50 correspond to the movable contact 106. Each movable contact 106 is composed of one arm constituting the main body of the movable contact 106 and a pair of contacts mounted on both ends of the arm. Since the detailed structure of the movable contact 106 thus configured is the same as the corresponding structure of the circuit breaker according to the present invention, FIG. 5 can be referred to. The portion indicated by reference numeral 38 shown in FIG. 5 corresponds to the arm, and the portions indicated by reference numerals 40 and 42 correspond to a pair of contacts. When the holder 116 is rotated by the link mechanism 108, the four movable contacts 106 are supported by one common holder 116, so that the first fixed contact 104 and the second fixed contact 104 rotate together. The contacts 102 are separated from the contacts 102, respectively.

At this time, three of the four movable contacts 106 (see the three movable contacts on the left side of FIG. 4) perform a function of opening and closing a circuit between the load and the three-phase AC power supply. The remaining one movable contact (see one movable contact on the right side in FIG. 4) is a neutral contact that performs a grounding function.

The trip mechanism 110 includes a trip device 122 that detects an overcurrent generated in a load circuit due to a short circuit or a short circuit and generates a driving force, and a driving force of the trip device 122. And a latch holder 126 that operates the link mechanism 108 by the rotation of the claw 124. At this time, the trip device 122 is usually composed of a heating coil that is heated when an overcurrent occurs and a bimetal that is bent by the heating coil to generate a driving force, or is configured to have an attractive force when an overcurrent occurs. , And an actuator that is attracted by the coil and generates a driving force.

The link mechanism 108 is connected (retained) by a latch 130, which is restrained (cut off) by the latch holder 126 or released from the restraint, and connected to the center of the latch 130 by a pin. When the lock is released and the latch 130 rotates counterclockwise in FIG. 9, the upper link 132 that rotates counterclockwise with the latch 130 and the upper end is pinned to the upper link 132 The lower link is connected by 136, and the lower end is connected to the holder 116, and is rotated clockwise by the counterclockwise rotation of the upper link 132, thereby rotating the holder 116 clockwise. 134 and a lower end thereof are connected to the pin 136, and an upper end thereof is connected to a support member connected to the lever 112 so as to rotate the upper link 132 and the lower link 134 when the latch 130 is released. Provides elastic energy And pulling 138 was constituted encompass.

Hereinafter, the operation of the conventional circuit breaker thus configured will be described.

When an overcurrent is generated from the load circuit, the trip device 122 detects the overcurrent and provides a driving force for trip operation, and the claw 124 is rotated by the driving force from the trip device 122. Next, the rotation of the pawl 124 causes the latch holder 126 to rotate, and the latch 130 restrained by the latch holder 126 is released. Next, the spring 138 contracts from the pulled state, and the upper link 132 rotates counterclockwise and the lower link 134 rotates clockwise while the pin 136 is pulled upward. At this time, the latch 130 connected to the upper link 132 by the pin also rotates counterclockwise. Further, the clockwise rotation of the lower link 134 causes the holder 116 connected to the lower link 134 by a pin to also rotate clockwise. By the clockwise rotation of the holder 116, the four movable contacts 106 commonly supported by the holder 116 simultaneously rotate in the clockwise direction, so that each movable contact 106 becomes the first fixed contact 104 and the second fixed contact 104. By being separated from the fixed contact 102, the electric circuit between the power supply and the load is cut off.

Then, after the cause of the overcurrent occurrence on the load circuit is removed, when the user moves the lever 112 to the ON position to return the circuit breaker to the ON state, the spring 138 is pulled while being pulled. By pushing the pin 136 downward, the upper link 132 rotates clockwise and the lower link 134 rotates counterclockwise. Next, the holder 116 also rotates in the counterclockwise direction, and the four movable contacts 106 commonly supported by the holder 116 also rotate in the counterclockwise direction while rotating the first fixed contact 104 and the second fixed contact, respectively. The electrical circuit between the power supply and the load is connected by being simultaneously contacted with the child 102.

On the other hand, each contact of the neutral pole movable contact and each contact of the fixed contact, which is a neutral pole contact, are each other pole contact (each contact of the movable contact of the other pole and each fixed contact). The contact must come in contact with the circuit before the contact, and must be separated later than the other pole contacts when the circuit is interrupted. Grounding must be connected so as to consume a large arc current generated between the contacts when the circuit is opened or closed, or to consume a leakage current that may be generated from a load circuit or a power supply circuit. In order to ensure the safety of personnel and equipment by grounding in this way, make sure that the ground is connected before the circuit between the power supply and the load is connected and until a predetermined time after the circuit is cut off. Therefore, it is necessary to ensure security more reliably.

[0014]

[Problems to be solved by the invention]

 However, in such a conventional dual-contact type four-pole circuit breaker, the neutral pole movable contact and the fixed contact have the same structure as the movable contact and the fixed contact of the other pole. Because the time when the movable contact of the neutral pole contacts or separates from the fixed contact connected to the ground is the same as the time when the movable contact of the other pole contacts or separates from the fixed contact, human and electrical There was an inconvenience that the safety of mechanical load equipment could not be reliably protected.

The present invention has been made in view of such a conventional problem, and when a circuit is connected between a power supply and a load, a neutral pole contact is made to come in contact with another pole contact before the other. To provide a dual-contact type four-pole circuit breaker that can improve safety and reliability by separating the neutral pole contact after a predetermined time delay from the other pole contacts during circuit interruption. With the goal.

[0016]

[Means for Solving the Problems]

 In order to achieve such an object, the dual-contact type four-pole circuit breaker according to the present invention is provided with three contacts, each of which is provided with three first fixed contacts for connecting to a three-phase AC power supply, A contact is provided and one second fixed contact for connecting to ground, and three contacts are provided respectively for connecting to the load to provide said three-phase AC power to the load. A third fixed contact and a pair of contacts, respectively, to provide the three-phase AC power to the load or to provide an electrical circuit between the three-phase AC power and the load. In order to cut off, the pair of contacts contacts the contacts of the first fixed contact and the contacts of the third fixed contact, or separates from the contacts of the first fixed contact and the contacts of the third fixed contact. Three movable first contacts that are movable to a position where the first fixed contact and a contact that separates from or separates the contact of the second fixed contact. The contact angle of the first fixed contact can be moved to a position where it contacts the contact of the contact or separates from the contact of the second fixed contact, and moves to a position where it contacts or separates the contact of the second fixed contact. A second movable contact smaller than a moving angle of the first movable contact when moving to a position where the contact and the contact of the third fixed contact are electrically connected or separated; and the first movable contact. And a holder for supporting the second movable contact so as to be driven at the same time.

[0017]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The dual-contact type four-pole circuit breaker according to the present invention has contacts 4a ′ as shown in FIGS. 1, 5 and 8, and is connected to a three-phase AC power supply. Three first fixed contacts 4 ', and a contact 4a, one second fixed contact 4 for connection to the ground, and a contact 2a, respectively. Are provided with three third fixed contacts 2 for connecting the load to the load, and a pair of contacts 40 and 42, respectively, for providing the three-phase AC power to the load. Alternatively, in order to cut off an electric circuit between the three-phase AC power supply and the load, a pair of contacts 40 and 42 are connected to the contact points 4a 'and 3rd of the first fixed contact 4'. Three first movable contacts that are in contact with the contact 2a of the fixed contact 2 or that can move to a position separated from the contact 4a 'of the first fixed contact 4' and the contact 2a of the third fixed contact 2 Contact 38 and the second fixed contact A contact 54 that contacts or separates the second fixed contact 4 from the contact 4a of the second fixed contact 4 or separates from the contact 4a of the second fixed contact 4. The position at which the contact angle of the first fixed contact 4 'and the contact 2a of the third fixed contact 2 electrically connect or separate the contact 4a' of the first fixed contact 4 'to the position where the contact 4a contacts or separates the fourth contact 4a. The holder 36 for supporting the second movable contact 50 and the first movable contact 38 and the second movable contact 50 so as to be driven simultaneously is smaller than the moving angle of the first movable contact 38 when moving the first movable contact 38. And is included. FIG. 1 is a cross-sectional view of the circuit breaker according to the present invention centered on the neutral pole contact so that the neutral pole contact appears. No contacts appear. Therefore, the first fixed contact 4 'and its contact 4a', the first movable contact 38 and its contacts 40 and 42, the third fixed contact 2 and its contact 2a are not shown in FIG. Can refer to FIG.

Hereinafter, such a characteristic configuration and other configurations similar to the conventional configuration will be described.

The circuit breaker according to the present invention is the same as the conventional circuit breaker shown in FIG. 9, and is additionally included in the circuit breaker according to the present invention. Link mechanism 10 for tripping, a trip actuator 12 for operating the link mechanism 10 to cut off the circuit when an overcurrent is detected, and a circuit breaker that is manually moved to the circuit connection (ON) or circuit cutoff (OFF) position. A switch lever 14 for switching the position with the switch, and an arc generated at the time of contact or separation between the first and third fixed contacts 4 ', 2 and the movable contact 38, which are mounted around the contact point, are extinguished. There is an arc extinguishing section 16 to be made.

The three first movable contacts 38 and the one second movable contact 50, which are four movable contacts, are connected to the holder 36 by pins (not shown), and are supported by the holder 36. At this time, the holder 36 is rotatably supported by the main body 13 of the circuit breaker. For the connection and support structure between the four movable contacts 38 and 50 and the holder 36, refer to FIG. 4 of a bottom view showing the structure of the four movable contacts and the holder according to the present invention. it can.

At this time, the three first movable contacts (the three movable contacts 38 on the left side in FIG. 4) perform a function of opening and closing a circuit between the load and the three-phase AC power supply, and the remaining one movable contact 38 Two second movable contacts (one movable contact on the left side of FIG. 4, 50) are neutral pole contacts that perform a grounding function.

As shown in FIG. 1, unlike the prior art, the second movable contact 50 according to the present invention is not connected to a load through the fixed contact. Instead, a lead wire 56 is connected to the load-side end of the second movable contact 50 as a connecting means for connecting the second movable contact 50 to a load, and the lead wire 56 is connected to the load. A terminal plate 58 and a screw (reference number not specified) are provided as connection terminals for connection. Further, the terminal plate 58 is connected to the lead wire 56 by a method such as soldering, and is mounted so that a screw (reference number not specified) penetrates the terminal plate 58. Such a connection between the connection means and the load can be made by connecting a lead line for grounding the load to the screw. Since the lead wire 56 is generally manufactured by twisting a plurality of flexible copper wires or by laminating a plurality of flexible copper thin plates, it is necessary to rotate the second movable contact 50. Does not interfere at all.

In the present invention, the moving angle at which the second movable contact 50 moves to a position where it contacts or separates from the contact 4a of the second fixed contact 4 is the contact angle 4a 'of the first fixed contact 4'. Is electrically connected to the contact point 2a of the third fixed contact 2 or is smaller than the moving angle when moving to a position where the third fixed contactor 2 is separated. This is described in detail below with reference to FIG.

When an overcurrent occurs due to a short circuit or a short circuit in a load circuit, the trip actuator 12 detects the overcurrent and generates a driving force, and the trip device 18 rotates by the driving force of the trip device 18. It includes a nail 19 and a latch holder 20 for operating the link mechanism 10 by rotating the nail 19. At this time, the trip device 18 is usually composed of a heating coil that is heated when an overcurrent occurs and a bimetal that is bent by the heating coil to generate a driving force, or generates an attraction force when an overcurrent occurs. And an actuator that is attracted by the coil to generate a driving force.

The link mechanism 10 is connected to a latch 24, which is restrained (cut off) by the latch holder 20 or released from the restraint, and a pin connected to the center of the latch 24. When the latch 24 is released in the counterclockwise direction in FIG. 1 when the restraint is released, an upper link 26 that rotates counterclockwise with the latch 24 and the upper end is pinned to the upper link 26 A lower link 28 connected to the holder 36 by a counterclockwise rotation of the upper link 26, thereby rotating the holder 36 clockwise; The lower end is connected to the pin 30 and the upper end is connected to a support member connected to the lever 14 to provide elastic energy for rotation of the upper link 26 and the lower link 28 when the latch 24 is released. And a spring 34 It is.

The arc extinguishing section 16 is generally formed by laminating a plurality of “U” -shaped arc extinguishing plates.

Hereinafter, the operation state of the movable contact and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in the circuit connection state will be described with reference to FIG.

The first movable contact 38 is a three-phase AC electrode movable contact provided to correspond to each phase of the three-phase AC, and is provided in the longitudinal direction of each first movable contact 38. Contact points 42 and 40 are mounted on both ends of the first and second fixed contacts 4 'and 4 so as to face the first fixed contact 4' and the third fixed contact 2, respectively. The central portions in the length direction of the three first movable contacts 38 are connected to the holder 36 by pins (not shown), and the first movable contacts 38 are supported by the holder 36. The lower end of the lower link 28 is connected to the holder 36 by a pin (reference number not specified), and the upper end is connected to the upper link 26 by a pin 30. The upper link 26 has an upper end connected to a central portion in the length direction of the latch 24 by a pin (not shown). The upper end of the spring 34 is connected to a connecting member (not specified by a reference number) of the lever 14, and the lower end is connected to the pin 30. Further, it is preferable to use a coil spring that stores elastic energy when the spring 34 is pulled.

FIG. 2 shows a state in which the spring 34 is pulled by the user placing the lever 14 in the “ON” position, and the upper link 26 is moved clockwise from the spring 34 via the pin 30. In addition, the lower links 28 are each receiving a pressing force in the counterclockwise direction.

At this time, the latch 24 is in a state of being restrained (blocked) by the latch holder 20 shown in FIG.

Accordingly, the contacts 42 and 40 of the first movable contact 38 maintain the state of contact with the respective contacts 4 a ′ and 2 a of the first fixed contact 4 ′ and the third fixed contact 2, respectively. .

Hereinafter, an operation state of the first movable contact and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in a circuit interruption state will be described with reference to FIG.

The configuration of the first movable contact and the link mechanism shown in FIG. 3 is the same as the configuration described above with reference to FIG. 1 and FIG. The operation of the movable contact and the link mechanism will be described.

As described in the related art, when an overcurrent occurs due to a short circuit or a short circuit in the load circuit, the trip device 18 detects the overcurrent and provides a driving force. The rotation of the latch 19 releases the restraint of the latch 24 while rotating the latch holder 20 by the rotation of the claw 19. Next, the upper link 26 and the latch 24 rotate counterclockwise in the drawing by pulling the pin 30 upward while the spring 34 that has been pulled contracts. Therefore, the lower link 28 rotates clockwise about the pin 30, and the holder 36 connected to the lower link 28 by the pin also rotates clockwise, and eventually the first movable contact supported by the holder 36. The contact 38 is also rotated clockwise by the angle θ, so that the contacts 42 and 40 are separated from the contacts 4a ′ and 2a of the first fixed contact 4 ′ and the third fixed contact 2, respectively, so that the contact between the power supply and the load Circuit is interrupted.

Hereinafter, the connection and support relationship between the four movable contacts and the holder of the dual-contact type four-pole circuit breaker according to the present invention will be described with reference to FIG. The holder 36 is a means for commonly supporting the four movable contacts, and includes a portion for supporting the plurality of movable contacts and a shaft connected to the support portion. It is molded integrally by molding synthetic resin material.

As shown in FIG. 4, the first movable contact 38 of the three-phase AC electrode movable contact corresponds to the three on the left side, and the second movable contact 50 of the neutral pole movable contact is It corresponds to the one on the far right. At both ends in the length direction of each first movable contact 38, each contact 42, which is in contact with or separated from each contact 4a ', 2a of the first fixed contact 4' and the third fixed contact 2, respectively, 40 is installed. A contact 54 is attached to an end of the second movable contact 50 facing the second fixed contact 4. The contact 52 mounted on the other end of the second movable contact 50 is substantially unnecessary and need not be mounted. This is because, as described above, the other end of the second movable contact 50 is always connected to the terminal plate 58 and the screw via the lead wire 56 as described with reference to FIG. This is because there is no fixed contact corresponding to the contact 52.

Hereinafter, the moving angle at which the second movable contact 50 moves to a position where the second movable contact 50 comes into contact with or separates from the contact 4a of the second fixed contact 4 is changed to the third fixed contact with the contact 4a ′ of the first fixed contact 4 ′. The configurational feature according to the present invention, which is smaller than the moving angle at which the contact point 2a of the child 2 is electrically connected or moved to the position to be separated, will be described with reference to FIGS. 5 and 8. You.

First, as shown in FIG. 5, the first movable contact 38 for the three-phase AC electrode has its center in the length direction penetrating the upper central portion of the cross section of the support of the holder 36. It is supported by the holder 36 by being inserted into the provided first hinge pin 44.

When contact points 42 and 40 of the first movable contact 38 come into contact with contact points 4 a ′ and 2 a of the first and third fixed contacts 4 ′ and 2, a contact maintaining force is applied. A spring 46 is interposed between the holder 36 and the first movable contact 38.

More specifically, the center of the spring 46 is wound around the first hinge pin 44, and one end is hung on a projection 48 projecting from the side surface of the holder 36, and the other end is Is hung on the upper surface on one side of the movable contact 38. Accordingly, when the holder 36 rotates counterclockwise and the contacts 40, 42 contact the contacts 4a ', 2a of the first and third fixed contacts 4', 2 respectively, the first and third fixed An elastic force is applied to the first movable contact 38 in a direction in which the contacts 4a ', 2a of the contacts 4', 2 contact the respective contacts 4a ', 2a. At this time, the elastic force of the spring 46 is smaller than the elastic force of the spring 32 described with reference to FIGS.

At this time, when the circuit between the power supply and the load is cut off due to the occurrence of an overcurrent, the first movable contact 38 rotates by the rotation angle α that is the angle at which the first movable contact 38 moves clockwise, and the first movable contact The contacts 42, 40 of the contact 38 and the contacts 4a ', 2a of the first and third fixed contacts 4', 2 are separated from each other by an angle α. Conversely, when the circuit between the power supply and the load is connected, the first movable contact 38 is rotated by a rotation angle α, which is the angle at which the first movable contact 38 moves in the counterclockwise direction, and each contact of the first movable contact 38 is The contact points 42a, 40 and the respective contact points 4a ', 2a of the first and third fixed contacts 4', 2 are in contact with each other.

On the other hand, in the neutral movable second movable contact 50 according to the present invention shown in FIG. 8, the center in the length direction is a predetermined distance from the center position of the cross section of the supporting portion of the holder 36. By being inserted into the second hinge pin 62 mounted so as to penetrate only the lower left position, it is supported by the holder 36.

When the contact 54 of the second movable contact 50 comes into contact with the contact 4 a of the second fixed contact 4 for grounding, a spring 60 for applying a contact maintaining force is formed with the holder 36 and the second movable contact. Intervenes between the child 50.

More specifically, the center of the spring 60 is wound around the second hinge pin 62, and one end is hung on a projection 64 protruding from the side surface of the holder 36, and the other end is Is hooked on the upper surface on one side of the second movable contact 50. Therefore, when the holder 36 rotates in the counterclockwise direction and the contact 54 contacts the contact 4a of the second fixed contact 4, the second movable contact in the direction in which the contact 54 contacts the contact 4a of the second fixed contact 4. Elastic force is applied to 50. At this time, the elastic force of the spring 60 is smaller than the elastic force of the spring 32 described with reference to FIGS.

At this time, when the circuit between the power supply and the load is cut off due to the occurrence of an overcurrent, the second movable contact 50 rotates by the rotation angle β that is the angle at which the second movable contact 50 moves clockwise, and the second movable contact 50 rotates. The contact 54 of the contact 50 and the contact 4a of the second fixed contact 4 are separated from each other by an angle β. At this time, the second movable contact 50 is mounted closer to the first and second fixed contacts 4 ′ and 4 than the first movable contact 38 with respect to the holder 36, so that there is a gap between the power supply and the load. When the circuit of the second movable contact 50 is disconnected from the contact 4a of the second fixed contact 4 when the circuit of the first movable contact 50 is disconnected, the contacts 42 and 40 of the first movable contact 38 are It is later than the point of separation from the contact 4a ′ of 4 ′ and the contact 2a of the third fixed contact 2.

On the other hand, when the circuit between the power supply and the load is connected, the second movable contact 50 rotates by the rotation angle β, which is the angle at which the second movable contact 50 moves in the counterclockwise direction. Contact 54 and contact 4a of second fixed contact 4 are in contact with each other. At this time, the second movable contact 50 is mounted closer to the first and second fixed contacts 4 ′ and 4 than the first movable contact 38 with reference to the holder 36, that is, FIGS. As shown in FIG. 8, since the rotation angle β is smaller than the rotation angle α, the point at which the contact 54 of the second movable contact 50 contacts the contact 4a of the second fixed contact 4 is the first movable contact 38 The contacts 42 and 40 of the first fixed contact 4 ′ come into contact with the contact 4 a ′ of the first fixed contact 4 ′ and the contact 2 a of the third fixed contact 2 earlier.

As described above, the method of mounting the second movable contact 50 having a neutral pole closer to the first and second fixed contacts 4 ′ and 4 than the first movable contact 38 having the other three poles is as described above. Then, the center of the second movable contact 50 in the longitudinal direction is inserted into the second hinge pin 62 mounted so as to pass through a lower left position by a predetermined distance from the center position of the cross section of the support portion of the holder 36. There is an embodiment that supports this. In another embodiment, a hinge pin for supporting the second movable contact 50 by the holder 36 is attached so as to penetrate the center position of the cross section of the holder 36, but the second movable contact 50 is There is a configuration in which the mounting angle is different from that in the case of the first movable contact 38 so that the angle is closer to the first and second fixed contacts 4 ′ and 4 than the first movable contact 38. .

Hereinafter, the state of the neutral contact point and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in the ON state will be described with reference to FIG.

One second movable contact 50 is provided as a grounding movable contact, and a contact 54 is provided at one end of the second movable contact 50 in the length direction on the second fixed contact 4. It is mounted so as to face the contact 4a. One end of a lead wire 56 is connected to the side surface of the other end of the second movable contact 50 in the length direction. The contact 52 shown at the other end of the second movable contact 50 need not be useless as described above. The other end of the lead wire 56 is connected to the terminal plate 58.

A central portion in the length direction of the second movable contact 50 is connected to the holder 36 by a pin (not shown), and the second movable contact 50 is supported by the holder 36. The lower end of the lower link 28 is connected to the holder 36 by a pin (reference number not specified), and the upper end is connected to the upper link 26 by a pin 30. The upper end of the upper link 26 is connected to the center in the length direction of the latch 24 by a pin (not shown). The upper end of the spring 34 is connected to a connecting member (reference number not specified) of the lever 14, and the lower end is connected to the pin 30. Preferably, the spring 34 utilizes a coil spring that stores elastic energy when pulled.

FIG. 6 shows a state in which the spring 34 is pulled by the user placing the lever 14 at the “ON” position, and the upper link 26 is pulled from the spring 34 via the pin 30. In the clockwise direction, the lower links 28 are each receiving a pressing force in the counterclockwise direction.

At this time, the latch 24 is in a state of being restrained (blocked) by the latch holder 20 shown in FIG.

Accordingly, the contact 54 of the second movable contact 50 remains in contact with the contact 4a of the second fixed contact 4, and the load circuit and the ground are connected.

Hereinafter, the state of the neutral pole contact and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in the circuit cutoff state will be described with reference to FIG.

The configuration of the second movable contact and the link mechanism shown in FIG. 7 is the same as the configuration described above with reference to FIGS. 1 and 6, and a description thereof will be omitted. The operation of the movable contact and the link mechanism will be described.

As described in the description of the related art, when an overcurrent occurs due to a short circuit or a short circuit in the load circuit, the trip device 18 detects the overcurrent and provides a driving force. To release the restraint of the latch 24 while rotating the latch holder 20 by the rotation of the claw 19. Then, the upper link 26 and the latch 24 rotate counterclockwise in the drawing by pulling the pin 30 upward while the spring 34 that has been pulled contracts. Accordingly, the lower link 28 rotates clockwise about the pin 30, and the holder 36 connected to the lower link 28 by the pin also rotates clockwise, and eventually, the second movable member supported by the holder 36. When the contact 50 also rotates clockwise, the contact 54 is separated from each contact 4a of the second fixed contact 4, and the circuit connection between the load circuit and the ground is released.

Hereinafter, the overall operation of the double-contact type four-pole circuit breaker according to the present invention configured as described above will be described with reference to FIGS.

When an overcurrent due to a short circuit or a short circuit occurs in the load circuit, the trip device 18 detects the overcurrent and provides a driving force. When the driving force of the trip device 18 rotates the claw 19, the claw 19 rotates. The rotation of the latch 19 releases the restraint of the latch 24 while also rotating the latch holder 20. Next, the upper link 26 and the latch 24 rotate counterclockwise in the drawing by pulling the pin 30 upward while the spring 34 that has been pulled contracts. Accordingly, when the lower link 28 rotates clockwise about the pin 30 and the holder 36 connected to the lower link 28 by the pin also rotates clockwise, first, the contacts 42 and 40 of the first movable contact 38 Is separated from the contact 4a 'of the first fixed contact 4', and is delayed by a time corresponding to the difference between the angle β and the angle α so that the contact 54 of the second movable contact 50 becomes the contact of the second fixed contact 4 4 Separate from a and complete the circuit interruption between the power supply and the load.

After the cause of the overcurrent is removed, when the lever 14 is moved to the ON position to return the circuit breaker to the ON state again, the spring 34 is pulled, and the spring 34 is pulled from the pin 30 to the pin 30. The upper link 26 receives a pressing force in the clockwise direction and the lower link 28 receives the pressing force in the counterclockwise direction via the, so that the state shown in FIGS. 2 and 6 is obtained.

At this time, the latch 24 is restrained (cut off) by the latch holder 20 shown in FIG.

At this time, the contact 54 of the second movable contact 50 comes in contact with the contact 4a of the second fixed contact 4 earlier by a time corresponding to the difference between the angle β and the angle α to connect the ground circuit. After ensuring safety, the contacts 42 and 40 of the first movable contact 38 contact the contact 4a 'of the first fixed contact 4', and the circuit between the power supply and the load is connected.

[0063]

[Effect of the invention]

 As described above, in the double-contact type four-pole circuit breaker according to the present invention, after the movable contact for the three-phase AC electrode separates from the fixed contact at the time of circuit interruption, after a predetermined time delay. The neutral pole movable contact separates from the ground fixed contact, and when the circuit is connected, the neutral pole movable contact contacts the ground fixed contact first before the three-phase AC electrode movable contact contacts the fixed contact. The effect is that the safety and reliability of the circuit breaker can be improved.

[Submission date] June 12, 2002 (2002.6.12)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009] Then, the link mechanism 108, or is binding on the latch holder 126, a latch (latch) 130 that constraint is released, and is connected by a pin to the central portion of the latch 130, the restraint of the latch 130 When released and the latch 130 rotates counterclockwise in FIG. 9, an upper link 132 that rotates counterclockwise with the latch 130, and an upper end is connected to the upper link 132 by a pin 136. The lower end is connected to the holder 116, and is rotated clockwise by the counterclockwise rotation of the upper link 132, thereby lowering the holder 116 clockwise. Is connected to the pin 136 and the upper end is connected to a support member connected to the lever 112 to provide elastic energy for rotation of the upper link 132 and the lower link 134 when the latch 130 is released. Sprit A grayed 138 was constituted encompass.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

[0026] The link mechanism 10, or is binding on the latch holder 20, the latch (latch) 24 of restraint is released, it is connected by a pin to the central portion of the latch 24, releasing restraint of the latch 24 is When the latch 24 rotates counterclockwise in FIG. 1, the upper link 26 rotates counterclockwise together with the latch 24, and the upper end is connected to the upper link 26 by the pin 30. The lower end is connected to the holder 36 and is rotated clockwise by the counterclockwise rotation of the upper link 26, thereby rotating the holder 36 clockwise. The portion is connected to the pin 30 and the upper end is connected to a support member connected to the lever 14 to provide elastic energy for rotation of the upper link 26 and the lower link 28 when the latch 24 is released. And a spring 34. You.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

[0031] At this time, the latch 24 is in the state of being binding on the latch holder 20 shown in FIG.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction contents]

[0053] At this time, the latch 24 is in the state of being binding on the latch holder 20 shown in FIG.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction contents]

[0061] At this time, the latch 24 is binding on the latch holder 20 shown in FIG.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a dual-contact type four-pole circuit breaker according to the present invention.

FIG. 2 is a side view showing an operation state of the first movable contact and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in a circuit connection state.

FIG. 3 is a side view showing an operation state of the first movable contact and the link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in a circuit interruption state.

FIG. 4 is a bottom view showing the connection and support relationship between the four movable contacts and the holder of the dual contact type four-pole circuit breaker according to the present invention.

FIG. 5 is a cross-sectional view taken along the line II-II of FIG. 4, illustrating the contact angle between the first movable contact and the fixed contact and the separation angle of the dual-contact type four-pole circuit breaker according to the present invention; It is.

FIG. 6 is a side view showing a state of each neutral pole contact and a link mechanism when the dual contact type four-pole circuit breaker according to the present invention is in an ON state.

FIG. 7 is a side view showing the state of each neutral pole contact and link mechanism when the dual-contact type four-pole circuit breaker according to the present invention is in a circuit break state.

FIG. 8 is a cross-sectional view taken along the line III-III of FIG. 4, showing the contact angle between the neutral movable contact and the fixed contact and the separation angle of the dual contact type four-pole circuit breaker according to the present invention; FIG.

FIG. 9 is a cross-sectional view showing a conventional double-contact type 4-pole circuit breaker.

[Explanation of symbols]

 2 3rd fixed contact 4 4 2nd fixed contact 4 '1st fixed contact 10 link mechanism 12 trip actuator 14 lever 16 extinction section 18 trip device 20 latch holder 24 latch 26 Upper link 28 ... Lower link 30 ... Pin 34 ... Spring 36 ... Holder 38 ... First movable contact 40, 42 ... First movable contact 44, 62 ... Hinge pin 46, 60 ... Spring 48, 64 ... Projection 50 ... Second movable Contact 52, 54 ... second movable contact 56 ... lead wire 58 ... terminal board

Claims (3)

[Utility model registration claims] 1. A first fixed contact provided with contacts, respectively, three first fixed contacts for connection to a three-phase AC power supply, and a second fixed contact provided with contacts. A second fixed contact for connecting to ground, and a third fixed contact provided with respective contacts, for connecting to the load to provide the three-phase AC power to the load. Three third fixed contacts, and a first movable contact provided with a pair of contacts, respectively, providing the three-phase AC power to the load, or providing the three-phase AC power and the load In order to cut off an electrical circuit between the pair of contacts, the pair of contacts is contacted with the contacts of the first fixed contact and the contacts of the third fixed contact, or the contacts of the first fixed contact and the Three first movable contacts movable to positions separated from the contacts of the third fixed contact, and the contacts of the second fixed contact A second movable contact provided with a contact that is in contact with or separated from a point, wherein the second movable contact is movable to a position in contact with the contact of the second fixed contact or separated from the contact of the second fixed contact; (2) The moving angle at which the contact of the fixed contact contacts or separates from the contact of the first fixed contact moves to a position at which the contact of the first fixed contact and the contact of the third fixed contact are electrically connected or separated. A second movable contact smaller than the moving angle of the first movable contact at the time, and a holder for supporting the first movable contact and the second movable contact so that they are simultaneously driven. A dual-contact type four-pole circuit breaker characterized by being constituted by: 2. The four-pole circuit breaker of claim 1, further comprising connecting means for connecting the second movable contact to a load. 3. The double contact according to claim 2, wherein the connection means includes a lead wire and a connection terminal for connecting the lead wire to a load. Type 4-pole circuit breaker.