JP2009009755A - Remote-control circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote-control circuit breaker capable of suppressing the generation of an arc caused by the switching of a relay contact. <P>SOLUTION: The circuit breaker is provided with a coupling piece 67 extended toward the opposite side of a main fixed contactor 80 through the side of a main movable contactor 81 so as to cross from the other end side of the main fixed contactor 80 to the other end side of the main movable contactor 81, an arc driving piece 68 extended from the coupling piece 67 nearly in parallel toward one end side of the main movable contactor 81 in a way opposing the main movable contactor 81, and an arc driving body 66 with the other end of a relay fixed contactor 90 connected to one end of the arc driving piece 68. A case 2 of a body 1 has a support part 61 arranged between a main fixed contact 80a and a relay fixed contact 90a and rockingly supporting the arc driving body 66 due to the placement of the main fixed contactor 80 to the case, whereby, the relay fixed contact 90a turns in a direction toward the relay movable contact 91a with the support part 61 as a fulcrum when the main contacts are closed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a remote control circuit breaker capable of opening and closing a contact by remote operation.

  Conventionally, a main contact device having a main fixed contact and a main movable contact inserted in an electric circuit formed between a power supply side terminal and a load side terminal, and when an abnormal current flows in the electric circuit when the main contact device is closed, A contact switching device for forcibly opening the contact device, a relay contact device having a relay fixed contact and a relay movable contact connected in series with the main contact device in the electric circuit, and a relay movable contact by an external signal There is provided a remote control circuit breaker provided with an electromagnet device to be brought into contact with and separated from, for example, disclosed in Patent Document 1.

  In the remote control type circuit breaker described in Patent Document 1, the main contact device includes a main fixed contact having a main fixed contact fixed to one end and a main movable contact facing the main fixed contact on one end. The relay contact device has a fixed main movable contact, a relay fixed contact with a fixed relay contact fixed at one end, and a movable relay with a relay movable contact fixed at one end facing the fixed relay contact. A connecting piece extending from the other end of the main fixed contact, the relay fixed contact, and the main fixed contact across the other end of the main movable contact, and the main movable contact from the connecting piece. An arc driving body is disposed in the container. The arc driving body includes an arc driving piece that extends toward one end of the main movable contact and is connected to the relay fixed contact.

For this reason, since the main contact device and the relay contact device are connected by an arc drive that has a current flow direction opposite to that of the main fixed contactor, the main movable contact is forcibly opened from the main fixed contact by a short-circuit current. The electromagnetic force at the time of pole can be strengthened, and the arc can be quickly stretched and extinguished.
JP 2006-92978 A

  However, in the above conventional example, since the arc driving body is fixed to the body, when the relay contact is closed, a repulsive force is generated due to an impact when the relay movable contact comes into contact with the relay fixed contact. As a result, the movable relay contact may be separated from the fixed relay contact, causing an arc.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a remote-control circuit breaker that can suppress the generation of an arc due to opening and closing of a relay contact.

  In order to achieve the above object, the invention of claim 1 is inserted into a container having a power supply side terminal and a load side terminal at both ends, respectively, and an electric circuit formed between the power supply side terminal and the load side terminal. A main contact device having a main fixed contact and a main movable contact, a contact switching device for forcibly opening the main contact device when an abnormal current flows in the circuit when the main contact device is closed, and a main contact in the circuit A relay contact device having a relay fixed contact and a relay movable contact connected in series with the device, and a relay device that contacts and separates the relay movable contact with the relay fixed contact by an external signal. The main contact device includes a main fixed contact It has a main fixed contact fixed to one end and a main movable contact fixed to one end so that the main movable contact faces the main fixed contact. The relay contact device fixes the relay fixed contact to one end. Lille A fixed contact, and a relay movable contact having a relay movable contact fixed to one end side so as to face the relay fixed contact, from the other end of the main fixed contact, the relay fixed contact, and the main fixed contact A connecting piece extending across the other end of the main movable contact, and extending from the connecting piece to one end of the main movable contact in a form facing the main movable contact and connected to the relay fixed contact A remote control type circuit breaker in which an arc driving body composed of an arc driving piece is disposed in a body, the body being disposed between a main fixed contact and a relay fixed contact and having a main fixed contact A support part that swingably supports the arc drive body by being mounted is provided, and when the main contact is closed, the relay fixed contact rotates in the direction toward the relay movable contact with the support part as a fulcrum. And

  In order to achieve the above object, the invention of claim 2 is inserted into a container having a power supply side terminal and a load side terminal disposed at both ends, respectively, and an electric circuit formed between the power supply side terminal and the load side terminal. A main contact device having a main fixed contact and a main movable contact, a contact switching device for forcibly opening the main contact device when an abnormal current flows in the circuit when the main contact device is closed, and a main contact in the circuit A relay contact device having a relay fixed contact and a relay movable contact connected in series with the device, and a relay device that contacts and separates the relay movable contact with the relay fixed contact by an external signal. The main contact device includes a main fixed contact It has a main fixed contact fixed to one end and a main movable contact fixed to one end so that the main movable contact faces the main fixed contact. The relay contact device fixes the relay fixed contact to one end. Lille A fixed contact, and a relay movable contact having a relay movable contact fixed to one end side so as to face the relay fixed contact, from the other end of the main fixed contact, the relay fixed contact, and the main fixed contact A connecting piece extending across the other end of the main movable contact, and extending from the connecting piece to one end of the main movable contact in a form facing the main movable contact and connected to the relay fixed contact A remote control type circuit breaker in which an arc driving body composed of an arc driving piece is disposed in a body, wherein the relay fixed contact is provided between the relay fixed contact and the relay fixed contact and has elasticity It is characterized in that it is elastically biased in the direction toward the relay movable contact by an elastic member comprising

  According to the first aspect of the invention, when the main contact is closed, the arc drive body tilts in the direction toward the main fixed contact with the support portion as a fulcrum, and the relay fixed contact in the direction toward the relay movable contact. Since the arc drive turns to absorb the impact when the relay movable contact comes into contact with the relay fixed contact when the relay contact is closed, the relay movable contact is also fixed by the repulsive force. Even if it is about to leave, the relay fixed contact follows the relay movable contact by rotating the arc driving body, so that the relay movable contact does not leave the relay fixed contact, and therefore it is possible to prevent arcing. .

  According to the second aspect of the present invention, when the relay contact is closed, the impact when the relay movable contact comes into contact with the relay fixed contact is absorbed by the elastic member, and the repulsive force tends to separate the relay movable contact from the relay fixed contact. However, since the relay fixed contact follows the relay movable contact by the elastic member, the relay movable contact does not move away from the relay fixed contact, and therefore, arcing can be prevented.

(Embodiment 1)
Hereinafter, Embodiment 1 of a remote control type circuit breaker according to the present invention will be described with reference to the drawings. In the following description, the vertical direction in FIG. 1 is defined as the vertical direction. The present embodiment is a two-pole remote control circuit breaker, and as shown in FIG. 1, a container 1 having a power-side terminal 6 and a load-side terminal 10 disposed at both ends, The main contact device 8 having the main movable contact 81a and the main fixed contact 80a interposed in the electric path formed between the terminal 6 and the load side terminal 10 and the opening / closing operation of the handle 14 disposed on the upper surface of the container 1 are used. The movable contact 81a is brought into and out of contact with the main fixed contact 80a, and when the abnormal current flows through the electric circuit, the contact opening / closing device 30 for forcibly opening the main movable contact 81a from the main fixed contact 80a, and the main contact device 8 in the electric circuit A relay contact device 9 having a relay movable contact 91a and a relay fixed contact 90a connected in series, and a relay that makes the relay movable contact 91a contact and separate from the relay fixed contact 90a by an external signal. And a magnet unit 31 is location.

  As shown in FIG. 3, the container 1 includes a case 2 having an open side surface and a cover 3 that closes the opening. Further, in the interior of the container 1, intermediate portions in the direction connecting both side surfaces in the width direction of the container 1 are interposed between the case 2 and the cover 3 at each of the power supply side end and the load side end. An input side partition member 4 and an output side partition member 5 for partitioning are provided.

  The electric circuit inside the container 1 has a power supply side terminal 6, a flexible wire conductor 11, an abnormal current detection device 7, a flexible wire conductor 12, a main contact device 8, a relay contact device 9, and a flexible wire conductor 13 for each pole. The load side terminal 10 is configured. Each electric circuit extends along the longitudinal direction of the container 1 and is arranged in a space partitioned by the input-side partition member 4 and the output-side partition member 5 so as to be juxtaposed along the width direction of the container 1. Has been.

  In each pole, the power supply side terminal 6 of the electric circuit is disposed at one end in the longitudinal direction of the vessel body 1 and is a plug-in that contacts a conductive bar (not shown) connected to a main breaker (not shown). Terminal. The power source side terminal 6 is disposed at one end in the longitudinal direction of the container body 1 in a groove 85 formed for fitting a part of the container body 1 into the conductive bar.

  The load side terminal 10 is a fast connection terminal using a lock spring 82 that is disposed at the other end in the longitudinal direction of the container body 1 and fast connects an external electric wire conductor (not shown). The load-side terminal 10 is disposed inside an electric wire conductor insertion hole 83 penetrating through the case 2 and can be unlocked by an unlocking member 84. The unlocking member 84 has a hole 84b in an intermediate portion, and both ends of a shaft 98 inserted through the hole 84b are supported by the case 2 and the cover 3 through the output-side partition member 5, and thereby the shaft can be rotated freely. It is supported.

  A part of the lower end portion of the unlocking member 84 is placed on the locking spring 82, and an engagement piece 86 is provided to engage with the tip of the wire conductor that has passed through the locking spring 82 from the wire conductor insertion hole 83. Yes. An upper end portion of the unlocking member 84 is exposed from a part of an exhaust hole 64a described later of the case 2, and a display portion 84a is provided in the exposed portion. The display portion 84a is positioned at the side edge of the handle 14 in the exhaust hole 64a when not pressed by the wire conductor, and the release member 84 presses the engagement piece 86 by the tip of the wire conductor and rotates counterclockwise. By moving, the display screen (not shown) is moved so as to be exposed. Thus, it can be visually confirmed that the wire conductor has been securely inserted.

  The contact opening / closing device 30 and the electromagnet device 31 are shared by the poles, and are disposed in a substantially central portion of the container body 1 in the longitudinal direction, that is, between the input side partition member 4 and the output side partition member 5. The contact opening / closing device 30 is disposed on the upper side of the insulating partition wall 32 provided substantially at the center in the vertical direction of the case 2, and the electromagnet device 31 is disposed on the lower side of the insulating partition wall 32.

  As shown in FIG. 1, the contact switching device 30 mainly includes a handle 14, a reverse link 15, a lever 16, a movable frame 17, an opening spring 19, a tripping member 20, and an abnormal current device 7. The handle 14 has a shaft 14 a that is pivotally supported between the case 2 and the cover 3, and a part of the handle 14 protrudes from an opening 18 that penetrates the upper surface of the case 2. One end of the reversing link 15 is connected to the handle 14, and the other end is connected to an intermediate portion serving as a fulcrum of the lever 16. One end of the lever 16 is locked to the tripping member 20, and the other end is locked to the movable frame 17. The movable frame 17 has a shaft 17 a that is pivotally supported between the case 2 and the cover 3. The movable frame 17 is provided with a concave portion 17b in which the contact pressure applying spring 34 is accommodated, and a main movable contact 81 described later is inserted into the concave portion 17b. The main movable contact 81 is held by the contact pressure applying spring 34 in the recess 17b and connected to the flexible wire conductor 12. The opening spring 19 is disposed in a compressed state between the movable frame 17 and a spring receiver 21 provided in the case 2 and biases the movable frame 17 in the clockwise direction in FIG. The tripping member 20 has a shaft 20a pivotally supported between the case 2 and the cover 3 in a direction in which the locking portion 22 provided integrally locks one end of the lever 16 (in FIG. 1). It is biased by the return spring 23 in a counterclockwise direction.

  As shown in FIG. 6, the abnormal current detection device 7 includes a movable-side magnetic body 75 a that is provided at each pole of the container 1 and that performs an electromagnetic attraction operation on the fixed-side magnetic body 75 b by a magnetic flux generated by a short-circuit current. It comprises a short circuit detection means 75 and an overcurrent detection means 76 using bimetal. In one pole, an intermediate portion of the operation lever 77 is pivotally supported on a shaft 78 provided on the input side partition member 4, and the operation lever 77 rotates clockwise by being pushed by the movable side magnetic body 75a or the bimetal. . The operation lever 77 is connected to the tripping member 20 via the reverse link 79, and when the operation lever 77 is operated by short circuit detection or overcurrent detection, the tripping member 20 is rotated clockwise against the return spring 23. The lever 16 of the contact opening / closing device 30 is pulled off and operated. At the other pole, the tripping member 20 is provided with two operating lever portions 77a that are pressed by the movable side magnetic body 75a and the bimetal of the abnormal current detection device 7.

  The contact opening / closing device 30 is in the ON state as shown in FIG. 1, and with the one end of the lever 16 locked to the locking portion 22, the movable frame 17 is rotated by the handle 14 to compress the opening spring 19. The handle 14 is locked to the edge of the opening 18 by the biasing force. In this state, a main fixed contact 80a of a main fixed contact 80 described later and a main movable contact 81a of the main movable contact 81 are in contact with each other, and the main contact is closed. The off state is a state in which the handle 14 in the on state is operated to the opposite side as shown in FIG. 4, the reversing link 15 reverses as the handle 14 rotates, and the movable frame is moved by the biasing force of the opening spring 19. As the 17 rotates clockwise, the main movable contact 81 moves away from the main fixed contact 80, the main contact opens, and the lever 16 is pushed up. The operation from the off state to the on state is the opposite of the above operation.

  In the trip state, the tripping member 20 is rotated clockwise against the return spring 23 by the operation of the abnormal current detection device 7, and the lever 16 is pulled so that the locking portion 22 is detached from the lever 16. remove. Therefore, the movable frame 17 is rotated clockwise by the biasing force of the opening spring 19 to push up the lever 16, and the main movable contactor 81 is turned off, and the handle 14 biases the handle 14 in the off direction. (Not shown) is rotated to a neutral position between the ON position. The handle 14 can be turned off by operating it in the off direction from the neutral position.

  The electromagnet device 31 uses a latch-type polarized electromagnet, and is disposed in the body 1 so that the operation direction of the plunger 36 serving as a movable iron core coincides with the longitudinal direction of the body 1. As shown in FIGS. 7A and 7B, the electromagnet device 31 includes a coil frame 37, a plunger 36 inserted through the center of the coil frame 37, and a coil 38 wound around the outer periphery of the coil frame 37. Is provided. A pair of inner yokes 39 to be fixed iron cores are arranged on both upper and lower sides of the coil 38, and a pair of substantially U-shaped outer yokes 40 to be fixed iron cores are arranged on the outer sides thereof. Permanent magnets 41 are provided between the outer yoke 40 and the inner yoke 39 so as to make both yokes different from each other. Between the both end portions of the plunger 36 between the outer yoke 40 and the inner yoke 39, the armature plate 42 is provided. Is provided. A relay movable frame 44 of the relay contact device 9 is connected to one end of the plunger 36 by a shaft 36a.

  As shown in FIG. 5, the relay movable frame 44 has a shaft 44 a rotatably supported between the case 2 and the cover 3. Concave portions 44b are provided on both sides of the relay movable frame 44 in the width direction of the container body 1, and a relay movable contact 91 described later is inserted into the concave portion 44b and the relay movable contact 91 is provided on the concave portion 44b. It is held by a pressure applying spring 45. Further, the relay movable contact 91 and the load side terminal 10 are connected by the flexible wire conductor 13. A printed circuit board 49 having a switch 47 facing the relay movable frame 44 is disposed at one end of the plunger 36, and a print having a switch 48 facing the other end is also disposed at the other end of the plunger 36. A substrate 50 is provided. Thus, one end of the plunger 36 can push the switch 47 by the switch pressing portion 44c provided on the relay movable frame 44 by rotating the relay movable frame 44, and the other end of the plunger 36 is directly The switch 48 can be pushed. Each printed circuit board 49, 50 is mounted with a power feeding circuit for rectifying alternating current and energizing the coil 38, and the printed circuit board 49, 50 and the coil 38 are connected by a lead wire 52. .

  The plunger 36 can be switched between an on state and an off state by switching energization to the coil 38 by a control signal from an operation unit (not shown) provided outside. When the plunger 36 is in the ON state, the one end pushes the switch 47 via the relay rotating frame 44 and is latched by the permanent magnet 41 with the one end protruding outward (see FIG. 7A). . In addition, the plunger 36 is latched in a state in which the other end pushes the switch 48 and the other end protrudes to the outside by the permanent magnet 41 in the off state (see FIG. 7B). A control signal from the operation unit is provided below the load side terminal 10 of the container 1 and mounted on the printed circuit boards 49 and 50 via a remote control terminal 92 whose end is mounted on the printed circuit board 49. Applied to the power supply circuit.

  Hereinafter, the power supply circuit mounted on the printed circuit boards 49 and 50 will be described with reference to the drawings. As shown in FIG. 8A, this power supply circuit supplies power to the coil 38 from an AC power supply AC, and a pair of diodes D1 and D2 are connected in reverse parallel to one end of a load side terminal of the AC power supply AC. Are connected in series, and switches 47 and 48 are connected to one end of the diodes D1 and D2, and a remote switch SW that is turned on / off by a control signal from the operation unit is connected to the other end. It is connected. A surge absorbing element Z is provided between the output end of the AC power supply AC and one end of the coil 38. First, assuming that the plunger 36 is in an OFF state, the normally closed contact NC is closed in the switch 47 and the normally open contact NO is switched in the switch 48 as shown in FIG. Is closed. In this state, when the remote switch SW is operated by the operation unit so that the diode D1 side is turned on and the diode D2 side is turned off, half-wave rectification as shown in FIG. As a result, the plunger 36 shifts from the OFF state to the ON state, and when the one end of the plunger 36 presses the switch 47, the normally open contact NO is closed in the switch 47, and the switch 48 in which the plunger 36 is separated is closed. Since the normally closed contact NC is closed, the energization path to the coil 38 is opened and the energization to the coil 38 is stopped.

  Next, when the plunger 36 is in the ON state, when the operation opposite to the above is performed by the operation unit, that is, when the remote switch SW is operated so that the diode D1 side is turned off and the diode D2 side is turned on, as shown in FIG. Since the normally open contact NO is closed in the switch 47 and the normally closed contact NC is closed in the switch 48, half-wave rectification flows in the coil 38 in the opposite direction (see FIG. 8D). As a result, the plunger 36 shifts from the on state to the off state, and the other end of the plunger 36 pushes the switch 48, whereby the normally closed contact NC is closed in the switch 48 and the switch 47 in which the plunger 36 is separated. Then, since the normally open contact NO is closed, the energization path to the coil 38 is opened and the energization to the coil 38 is stopped.

  As described above, the on / off state of the plunger 36 can be switched by switching on / off of the remote switch SW by the operation unit. When the plunger 36 is in the on state, a relay is accompanied by the relay movable frame 44. When the movable contact 91 rotates clockwise, a relay movable contact 91a of the relay movable contact 91 comes into contact with a relay fixed contact 90a of a relay fixed contact 90 described later, and the relay contact is closed. Further, when the plunger 36 is in an OFF state, the relay movable contact 91 is rotated counterclockwise along with the relay movable frame 44, so that the relay movable contact 91 is separated from the relay fixed contact 90 and the relay contact is made. Open the pole.

  Note that a display lever 54 extends toward the upper end of the case 2 in the relay movable frame 44. A display opening 55 is formed at the upper end of the case 2 adjacent to the opening 18 for the handle 14, and a shaft portion 56a of the display body 56 for displaying the state of the relay contact is formed inside the case 2 and the output side. It is rotatably supported between the partition members 5. An engagement portion 56b is formed in the display body 56, and the upper end portion of the display lever 54 is engaged with the engagement portion 56b. Thus, as the relay movable frame 44 is turned in the ON direction or the OFF direction by the operation of the plunger 36, the display body 56 is rotated, and the ON or OFF indication written on the display body 56 is displayed. It is exposed to the outside through the opening 55.

  The main contact device 8 is disposed on the upper side of the body 1, the relay contact device 9 is disposed on the load side terminal 10 side of the body 1 with respect to the main contact device 8, and the electromagnet device 31 is disposed on the main contact device 8. On the other hand, it is disposed on the lower side of the container 1. In this case, the outer yoke 40 between the main contact device 8 and the permanent magnet 41 of the electromagnet device 31 is a magnetic body that avoids the magnetic flux caused by the current flowing through the main contact device 8 from affecting the permanent magnet 41 (for example, The role of iron plate is also used. The main contact device 8 has a main movable contact 81 having a main movable contact 81a fixed to one end, a main fixed contact 80a fixed to one end, and the other end facing the other end of the main movable contact 81. And a main fixed contact 80 extended in a shape. The relay contact device 9 includes a relay fixed contact 90 having a relay fixed contact 90a fixed to one end thereof, a relay movable contact 91a fixed to one end, and the other end opposite to the other end of the relay fixed contact 90. And a relay movable contact 91 that is extended. And the main fixed contact 80a and the relay fixed contact 90a are arrange | positioned so that it may become the electromagnet apparatus 31 side rather than the main movable contact 81a and the relay movable contact 91a, respectively.

  The set of the main movable contact 81a and the main fixed contact 80a and the set of the relay movable contact 91a and the relay fixed contact 90a are arranged side by side as shown in FIG. They are housed together in an arc extinguishing chamber 64 for each pole, which is composed of a space sandwiched between the case 2 and the output side partition member 5. The main fixed contact 80a is arranged so as to face upward, and the relay fixed contact 90a is arranged so as to face the direction in which the load side terminal 10 is present in the longitudinal direction of the body 1. Further, the exhaust holes 64a of the arc extinguishing chamber 64 of each pole are formed at corners where the upper surface of the container 1 and the end face on the output side are in contact.

  The main contact device 8 of each pole and the relay contact device 9 are electrically connected by an arc driver 66. As shown in FIG. 2A, the arc driver 66 passes through the side of the main movable contact 81 so as to cross the other end of the main movable contact 81 from the other end of the main fixed contact 80. A connecting piece 67 extending to the opposite side of the main fixed contact 80, and extending substantially parallel to the one end side of the main movable contact 81 in a form facing the main movable contact 81 from the connecting piece 67. An arc driving piece 68 is provided, and the other end of the relay fixed contact 90 is connected to one end of the arc driving piece 68. As a result, the main fixed contact 80a and the relay fixed contact 90a are connected via the arc driver 66.

  The main fixed contact 80, the connecting piece 67, the arc drive piece 68, and the relay fixed contact 90 are press-molded and bent by a single conductive plate, and the main fixed contact 80a and the relay fixed contact 90a are connected to the conductive plate. It is stuck to. In this case, the direction along the surface of the relay fixed contact 90a of the relay fixed contact 90 is fixed so as to be substantially orthogonal to the direction along the surface of the main fixed contact 80a of the main fixed contact 80, and the relay fixed An iron plate 70 is attached to the other end side of the contact 90. Furthermore, the relay fixed contact 90 around the main fixed contact 80a, the iron plate 70, the arc driving piece 68, the connecting piece 67, and the surface of the main fixed contact 80 facing the main fixed contact 80a are covered with respect to the main fixed contact 80a. An insulator 93 that is formed as described above and forms the inner wall of the arc extinguishing chamber 64 is disposed in the arc driving body 66. The relay movable contact 91 is formed with an extension piece 63 extending from the position where the relay movable contact 91a is fixed to one end side, and the iron plate 70 is bent on both sides of the extension piece 63 from both sides. A piece 70 a is formed, and a magnetic body 71 made of, for example, iron facing the both side pieces 70 a is attached to the extending piece 63.

  As shown in FIG. 2A, a substantially rectangular mounting portion 60 for mounting the main fixed contact 80 is provided on the wall portion of the case 2 that forms the arc extinguishing chamber 64. It protrudes along. A protruding wall 62 protruding upward is integrally formed at one longitudinal end of the mounting portion 60, and a support portion 61 that supports the main fixed contact 80 is provided in the vicinity thereof. The support portion 61 is formed in a convex shape toward the upper side across the width direction of the placement portion 60 on one end side in the longitudinal direction of the placement portion 60. Thus, by placing the main fixed contact 80 on the mounting portion 60 so that the protruding wall 62 is positioned between the main fixed contact 80 and the relay fixed contact 90, the arc driving body 66 is turned off. While being accommodated in the arc chamber 64, it is supported to be swingable with the support portion 61 as a fulcrum.

  Here, as shown in FIG. 2B, the support portion 61 of the placement portion 60 is located on the left side in the drawing with respect to the main fixed contact 80a. For this reason, when only the main contact is closed, the main movable contact 81a presses the main fixed contact 80a on the right side in FIG. It stops in a state of rotating around. When only the relay contact is closed, the relay movable contact 91a presses the relay fixed contact 90a on the left side in the drawing with respect to the support portion 61, so that the arc driver 66 rotates counterclockwise with the support portion 61 as a fulcrum. The rotation of the arc drive body 66 is restricted by the projecting wall 62, but the arc drive body 66 stops without rotating. When both the main contact and the relay contact are closed, the pressing force at each contact is balanced, so that the arc driving body 66 is stationary without rotating.

  Therefore, when the main contact is closed, the main movable contact 81a presses the main fixed contact 80a, so that the arc driving body 66 rotates clockwise with the support portion 61 as a fulcrum, thereby the relay fixed contact 90a. Also rotates clockwise and tilts toward the relay movable contact 91a. When the relay contact is closed in this state, that is, when the relay movable contact 91a is brought into contact with the relay fixed contact 90a, the arc movable body 66 rotates counterclockwise by the relay movable contact 91a pressing the relay fixed contact 90a. Move. Here, the arc driving body 66 rotates counterclockwise, so that it is possible to absorb an impact when the relay movable contact 91a contacts the relay fixed contact 90a. Further, even if the relay movable contact 91a tries to move away from the relay fixed contact 90a due to the repulsive force accompanying the impact, the arc driving body 66 is rotated clockwise by the pressing force of the main movable contact 81a to the main fixed contact 80a. Since the relay fixed contact 90a follows the relay movable contact 91a, the relay movable contact 91a does not move away from the relay fixed contact 90a, and therefore it is possible to prevent arcing.

(Embodiment 2)
Hereinafter, a remote control type circuit breaker according to a second embodiment of the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In this embodiment, instead of providing the support portion 61 on the mounting portion 60, an elastic member 90b made of an elastic material is provided between the relay fixed contact 90 and the relay fixed contact 90a as shown in FIG. ing. The elastic member 90b is made of, for example, a coil spring, and has one end fixed to the relay fixed contact 90 and the other end fixed to the relay fixed contact 90a. For this reason, the relay fixed contact 90a is elastically biased in the direction toward the relay movable contact 91a.

  When the relay contact is closed in this state, that is, when the relay movable contact 91a is brought into contact with the relay fixed contact 90a, the elastic movable member 90b is compressed by the relay movable contact 91a pressing the relay fixed contact 90a. For this reason, the impact when the relay movable contact 91a contacts the relay fixed contact 90a can be absorbed. Further, even if the relay movable contact 91a tries to move away from the relay fixed contact 90a due to a repulsive force due to an impact, the relay fixed contact 90a follows the relay movable contact 91a as the elastic member 90b tries to return. 91a does not move away from the relay fixed contact 90a, and therefore an arc can be prevented.

It is sectional drawing of the ON state which shows the remote control type circuit breaker of Embodiment 1 of this invention. It is principal part explanatory drawing same as the above, (a) is a principal part perspective view, (b) is a side view of an arc drive body. It is an exploded perspective view same as the above. It is sectional drawing of an OFF state same as the above. It is sectional drawing of a relay contact same as the above in an OFF state. It is a side view of an abnormal current detection apparatus same as the above. It is a figure which shows a relay apparatus same as the above, (a) is sectional drawing of an ON state, (b) is sectional drawing of an OFF state. FIG. 6 is an explanatory diagram of the relay device, wherein (a) is a circuit diagram in an on state, (b) is a current waveform diagram in an on state, (c) is a circuit diagram in an off state, and (d) is an off state. It is a current waveform diagram. It is a principal part enlarged view which shows the remote control type circuit breaker of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 30 Contact switching device 31 Electromagnet device 6 Power supply side terminal 61 Support part 66 Arc drive body 67 Connection piece 8 Main contact device 80 Main fixed contact 80a Main fixed contact 81 Main movable contact 81a Main movable contact 9 Relay contact device 90 relay fixed contact 90a relay fixed contact 91 relay movable contact 91a relay movable contact 10 load side terminal

Claims (2)

  A main contact device having a main fixed contact and a main movable contact inserted into an electric circuit formed between the power supply side terminal and the load side terminal, and a container body in which the power supply side terminal and the load side terminal are disposed at both ends, A contact switching device that forcibly opens the main contact device when an abnormal current flows in the electric circuit when the main contact device is closed, and a relay fixed contact and a relay movable contact that are connected in series with the main contact device in the electric circuit A relay contact device having an external signal and a relay device that contacts and separates the relay movable contact with an external signal. The main contact device has a main fixed contact with the main fixed contact fixed to one end side, and a main movable contact. The relay contact device has a relay fixed contact with a relay fixed contact fixed to one end and a relay movable contact fixed to the relay fixed contact. And a relay movable contact fixed to one end in a form opposite to the main fixed contact, extending from the other end of the relay fixed contact and the main fixed contact across the other end of the main movable contact. An arc driving body comprising an connecting piece to be extended and an arc driving piece extending from the connecting piece toward the one end side of the main movable contact so as to face the main movable contact and connected to the relay fixed contact is provided in the body. This is a remote control circuit breaker that is disposed between the main fixed contact and the relay fixed contact, and the main fixed contact is placed on the main body to swing the arc drive. A remote control type circuit breaker characterized in that a support part that freely supports is provided, and when the main contact is closed, the relay fixed contact rotates in the direction toward the relay movable contact with the support part as a fulcrum.   A main contact device having a main fixed contact and a main movable contact inserted into an electric circuit formed between the power supply side terminal and the load side terminal, and a container body in which the power supply side terminal and the load side terminal are disposed at both ends, A contact switching device that forcibly opens the main contact device when an abnormal current flows in the electric circuit when the main contact device is closed, and a relay fixed contact and a relay movable contact that are connected in series with the main contact device in the electric circuit A relay contact device having an external signal and a relay device that contacts and separates the relay movable contact with an external signal. The main contact device has a main fixed contact with the main fixed contact fixed to one end side, and a main movable contact. The relay contact device has a relay fixed contact with a relay fixed contact fixed to one end and a relay movable contact fixed to the relay fixed contact. And a relay movable contact fixed to one end in a form opposite to the main fixed contact, extending from the other end of the relay fixed contact and the main fixed contact across the other end of the main movable contact. An arc driving body comprising an connecting piece to be extended and an arc driving piece extending from the connecting piece toward the one end side of the main movable contact so as to face the main movable contact and connected to the relay fixed contact is provided in the body. It is a remote control type circuit breaker arranged, and the relay fixed contact is provided between the relay fixed contact and the relay fixed contact in a direction toward the relay movable contact by an elastic member made of an elastic material. Remote control circuit breaker characterized by being elastically biased.

Images