JP3800026B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker.
[0002]
[Prior art]
A conventional circuit breaker is described in Japanese Patent Application Laid-Open No. 11-329201. In the circuit breaker described in the above publication, a latch plate is connected via a link to a handle pivotally supported by the case with a part projecting from the case, and the voltage pole side and the neutral pole side The interlocking plate that drives the two movable contacts that open and close the contact portion of the door is pressed by the latch plate, and when the handle is rotated while the latch plate is latched by the latch engagement plate, the interlock plate Thus, each movable contact is driven to open and close the contact portions of the voltage electrode and the ground electrode.
[0003]
[Problems to be solved by the invention]
In the above conventional example, the movable contacts on the voltage pole side and the ground pole side are simultaneously driven by the interlocking plate interlocked with the handle, so that the contact portion on the voltage pole side is earlier than the contact portion on the ground pole side. There is a risk that a large current will flow through the contact part on the grounding pole side or an arc may occur during opening and closing because the contact part on the grounding pole side opens before the contact part on the voltage pole side. In addition, there is a problem that an expensive contact material having high durability must be used for the contact portion on the ground electrode side as well as the contact portion on the voltage electrode side.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a circuit breaker in which an inexpensive contact material that is not highly durable can be used for the contact portion on the ground electrode side. .
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the first aspect of the present invention provides a container housing the main circuit, a handle pivotally supported by the container, a first fixed contact, and a first fixed contact. A first contact portion having a first movable contact that contacts and separates, and a second contact that is inserted into the voltage electrode of the main circuit, a second fixed contact, and a second movable contact that contacts and separates from the second fixed contact Inserted into the grounding pole of the main circuit.In addition, the first contact portion is juxtaposed in the height direction of the container.A second contact portion, a connecting member connected to the handle, and the first movable contact connected to the connecting member, having the first movable contact at the tip, and turning the handle to the first movable contact. A first movable contact that is formed so as to be difficult to bend in the moving direction of at least the first movable contact.A plate that is movable in the same direction as the first movable contact, has the second movable contact at the tip, and biases the second movable contact in a direction to separate it from the second fixed contact A second movable contact formed by a spring;A latch member for latching a rear end portion of the first movable contact;The first and second movable contacts are arranged to be slidable along the moving direction.Driven by the first movable contactThe second movable contact is moved in a direction in which the second movable contact is in contact with and separated from the second fixed contact.Drive memberWhenAnd a distance for moving the second movable contact when the second contact portion is switched between the open state and the closed state, and a first distance when the first contact portion is switched between the open state and the closed state. Shorter than the distance to move the movable contactIn addition, a first contact portion is disposed at approximately the center in the width direction of the container body, a second contact portion is disposed at one end portion in the width direction of the container body, and the other contact portion in the width direction of the container body. An opening spring for urging the drive member in a direction to open the first and second contact portions is disposed at the end.When the handle is rotated while the first and second contact portions are open, the first movable contact becomes the first fixed contact in conjunction with the handle. It moves in the direction of contact and drives the drive member. In conjunction with this drive member, the second movable contact moves in the direction of bringing the second movable contact into contact with the second fixed contact. The second movable contact having a short moving distance comes into contact with the second fixed contact first to close the second contact portion, and if the handle is further rotated from there, the second movable contact having flexibility is provided. As the child bends, the first movable contact comes into contact with the first fixed contact, and the first contact portion is closed. On the other hand, if the handle is rotated with the first and second contact portions closed, the first movable contact causes the first movable contact to separate from the first fixed contact in conjunction with the handle. While moving in the direction and driving the drive member, the second movable contact is moved in the direction to separate the second movable contact from the second fixed contact in conjunction with the drive member. The first movable contact is separated from the first fixed contact before the bent second movable contact returns to the original state and the second movable contact is separated from the second fixed contact. Then, the first contact portion opens, and then the second movable contact that has returned to the original state moves the second movable contact in the opening direction to open the second contact portion. Further, even if the first contact portion is closed before the second contact portion, at least the first movable contact formed so as not to bend in the moving direction of the first movable contact causes the drive member to move. Since it cannot be driven as described above, the movement of the second movable contact is restricted and the second contact portion can be prevented from closing. Therefore, when switching from the open state to the closed state, the second contact portion on the ground electrode side is always closed before the first contact portion on the voltage electrode side, and the state is switched from the closed state to the open state. At the time of opening, the second contact portion on the ground electrode side is surely opened after the first contact portion on the voltage electrode side. As a result, it is possible to prevent a large current from flowing through the second contact portion on the grounding electrode side or an arc during opening and closing, and an inexpensive contact material that is not highly durable on the second contact portion on the grounding electrode side. Can be used. In addition, since only the connecting member is interposed between the handle and the movable contact and the movable contact is directly latched by the latch member, the number of parts can be reduced and the structure can be simplified as compared with the conventional case. This makes it easy to incorporate the parts into the container.Furthermore, the drive member can be made into a simple structure and can be easily incorporated into the container. Moreover, a container can be reduced in size in the width direction. Furthermore, since the driving force acts on the driving member by the second movable contact made of a leaf spring at the time of opening, it becomes easy to prevent the first contact portion from being welded by the arc. Further, since the driving force is applied to the driving member by the opening spring at the time of opening, it becomes easier to prevent the welding of the first contact portion due to the arc, and the load applied to the first and second contact portions is stabilized. be able to.
[0006]
  The invention of claim 2 is the invention of claim 1,The opening spring is a compression coil spring interposed between the drive member and the container, and a fixing portion for positioning and fixing the end of the compression coil spring is provided on the drive member and the container, respectively.It is characterized byThe buckling of the compression coil spring can be prevented, and the drive member can be reliably biased..
[0008]
  Claim3The invention of claim1 or 2In the invention ofSaidOf the first and second movable contactsEach movable contactThe drive member is disposed closer to the base end side, a lateral wall interposed between the first and second contact portions in a direction substantially orthogonal to the moving direction of the drive member, and the drive member side end surface of the lateral wall from the drive member side end surface A vertical wall extending along the moving direction is provided in the container, and the first contact portion on the voltage electrode side and the ground electrode side are provided by the horizontal wall and the vertical wall provided on the container and the driving member. A sufficient insulation distance can be secured between the second contact portions.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
[0013]
The circuit breaker of this embodiment is arranged in parallel in the width direction of the container body 1 in the container body 1 configured by connecting the first side case 1A and the second side case 1B made of synthetic resin on both sides. The two fixed contacts 2A, 2B, the two movable contacts 4A, 4B to which the fixed contacts 2A, 2B are opposed to the fixed contacts 2A, 2B are fixed, and the two movable contacts 4A. , 4B, and an opening / closing mechanism 5 for driving the handle 6, and by opening / closing the handle 6, the movable contacts 3A, 3B are brought into and out of contact with the fixed contacts 2A, 2B (contact / release) via the opening / closing mechanism 5. The fixed contacts 2A and 2B and the movable contacts 4A and 4B are arranged vertically in the height direction of the container 1, and two of the movable contacts 4A and 4B are 2 in the height direction. One movable contact 4B interposed between the two fixed contacts 2A and 2B and the other possible contact Height position that does not intersect the fixed contact 2A to which the movable contact 3A of the contactor 4A contacts or separates when viewed from the width direction of the body 1 in a state where the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B. Are arranged. The first contact portion composed of the fixed contact 2A and the movable contact 3A is inserted into the voltage electrode of the main circuit, and the second contact portion composed of the fixed contact 2B and the movable contact 3B serves as the ground electrode (neutral electrode) of the main circuit. Inserting.
[0014]
An intermediate case 7 formed of a synthetic resin material is fixed in one end portion of the container 1 so as to be sandwiched between both side cases 1A and 1B, and a recess 8 inside the side wall (outer wall) of the second side case 1B. And a terminal block 10B constituting a grounding pole side electric circuit provided with a fixed contact 2B at one end in a section constituted by the vertical wall portion 35 of the intermediate case 7 and is accommodated in the first case 1A side of the intermediate case 7. A terminal block 10A constituting a voltage electrode side electric circuit having a fixed contact 2A provided at one end is accommodated in a section constituted by the provided recess 9 and the side wall (outer wall) of the first case 1A.
[0015]
In the terminal block 10A, an extension piece 11a is integrally extended above a terminal plate 11 bent in a U-shape and one end of a lower piece of the terminal plate 11, and the upper end of the extension piece 11a is perpendicular to the extension piece 11a. A fixed contact 12A that is bent and integrally extended outward with respect to the terminal plate 11, a fixed contact 2A that is caulked and fixed to the upper surface of one end of the fixed contact 12A, and a lower piece of the terminal plate 11 It is comprised with the substantially M-shaped lock spring 13A accommodated in the terminal board 11. FIG. The terminal block 10 </ b> A constitutes the bottom of the recess 9 of the intermediate case 7, and the lower piece of the terminal plate 11 is placed on the lateral wall 24 that is formed to extend in parallel to the bottom of the container body 1. The extension piece 11a is arranged along the wall 25, the fixed contact 12A is led out of the recess 9 beyond the upper end of the vertical wall 25, and the second side case 1B is placed outside the recess 9 in the longitudinal direction. By disposing the tip portion of the stationary contact 12A on the lateral wall 15 integrally formed substantially parallel to the bottom portion of the two-side case 1B, it is disposed in the recess 9. The horizontal wall 15 is formed with a recess 15a for allowing the lower end of the fixed contact 2A protruding to the lower surface side of the fixed contact 12A to escape. The terminal plate 11 is formed by integrally extending a T-shaped piece 11 b upward from the other end of the upper piece, and the tip of the side protruding portion at the upper end of the T-shaped piece 11 b is formed on the wall surface of the intermediate case 7. It mounts on the upper end surface of convex part 22 '. Further, a protrusion 23 is integrally formed on the side surface of the side piece of the terminal plate 11 to be inserted into the holding piece 13b of the locking spring 13A and prevent the locking spring 13A from rattling.
[0016]
The lock spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion. When the intermediate case 7 is overlapped with the first side case 1A, the vertical wall at the other end of the recess 9 of the intermediate case 7 Insertion of an electric wire formed by a diagonally downward groove 160 having a semicircular cross section provided in the section and a diagonally downward groove 160 provided in the vertical wall of the other end of the first side case 1A in the same manner as the diagonally downward groove 160 A core wire of an electric wire (not shown) inserted from the outside through the hole 16A is press-fitted between the upper piece of the terminal plate 11, the upper end of the locking piece 13a of the locking spring 13A, and the upper end of the holding piece 13b. The core wire is locked in the drawing direction of the electric wire by the tip of the lock piece 13a, and the core wire is pressed against the upper piece of the terminal plate 11 by the upper end surface of the pressing piece 13b, thereby electrically connecting the core wire and the machine. It is supposed to hold. The release lock 17 is used to release the electric wire lock, and the release handle 17 has a rotary shaft 18 provided on the lower side surface thereof rotatable in a shaft hole 20 provided on the convex flat portion 22 ′ on the inner side surface of the intermediate case 7. An operating portion that is pivotally supported by a recess 37 formed on a side surface of a shaft 38 that is pivotally supported by the first side case 1A and protrudes from the inner wall surface of the first side case 1A. By manually operating 17a and rotating, the driving projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to bend the locking piece 13a and lock the core wire The state can be canceled. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 to rotate in the anti-manual operation direction.
[0017]
On the other hand, the terminal block 10B is basically composed of a terminal plate 11, a lock spring 13B, and a stationary contact 12B, like the terminal block 10A. However, unlike the terminal plate 11 of the terminal block 10A, the terminal block 10B The terminal plate 11 of the block 10B has an extension piece 11c extending downward from one end of the lower piece, and a fixed contact 12B is extended from the tip of the extension piece 11c so as to be parallel to the bottom of the body 1. Further, a back piece 11d extending at a right angle from one end of the side piece of the terminal plate 11 is formed.
[0018]
The lock spring 13B has the same structure as the lock spring 13A, is placed on the lower piece of the terminal plate 11, and a protrusion 23 protruding from the side piece of the terminal plate 11 is inserted into the holding piece 13b. It has become so.
[0019]
In this terminal block 10B, the lower piece of the terminal plate 11 is placed on the bottom inclined bottom surface of the concave portion 8 of the second side case 1B, the extension piece 11a is arranged along the rising wall 8a at one end of the concave portion 8, and the rising wall One end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of 8a and one end side of the bottom surface of the recess 8 so that the extension piece 11c goes out of the recess 8 and the intermediate case 7 is connected to the second case. When superposed on the side case 1B side, the front end of the fixed contact 12B, that is, the lower surface provided with the fixed contact 2B is placed on the rib 26 at the bottom of the second side case 1B. An isolation wall 14 is erected from the bottom of the second side case 1B near the tip of the fixed contact 12B, and a recess between the isolation wall 14 and the rib 26 is formed at the tip of the fixed contact 12B. It becomes the relief of the lower end part which protruded to the lower surface side of the fixed contact 12B of the fixed contact 2B fixed by caulking.
[0020]
Further, the tip of the side protruding portion at the upper end of the T-shaped piece 11b that is extended from the other end portion of the upper piece of the terminal plate 11 is above the convex flat portion 22 formed on the wall surface of the second side case 1B. Placed on the end face.
[0021]
The lock spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superimposed on the second case 1B, The oblique downward groove 160 provided in the opposite wall surface of the intermediate case 7 as well as the oblique downward groove 160 having a semicircular cross section provided in the vertical wall portion at the other end of the concave portion 8 of the side case 1B. When the electric wire is inserted from the electric wire insertion hole 16B formed by the above, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is pressed against the upper piece of the terminal plate 11 by the pressing piece 13b. They are electrically connected and mechanically locked.
[0022]
The release handle 17 ′ is used to release the electric wire lock, and the release handle 17 ′ has a rotating shaft 18 provided on the lower side surface of the release handle 17 ′ on the convex flat portion 22 of the second case 1 </ b> B. A shaft (not shown) that is pivotally supported by the provided shaft hole 20 and protrudes from the wall surface of the vertical wall portion 35 of the intermediate case 7 is pivotally pivoted in a recess 37 provided on the other lower side surface. The operation protrusion 17a which is supported and exposed to the outside of the container body 1 is manually operated and rotated so that the drive protrusion 19 provided at the lower end is the tip of one side end of the locking piece 13a of the locking spring 13B. By pressing the part, the locking piece 13a is bent, and the locking with respect to the core wire can be released. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 'to rotate in the anti-manual operation direction.
[0023]
Now, the opening / closing mechanism 5 for opening and closing the movable contacts 4A and 4B includes a handle 6, a connecting member 43 for connecting the handle 6 to the movable contact 4A on the voltage pole side, and a rear end portion of the movable contact 4A. The latch member 58 includes the protruding latch portion 60, the drive member 40, and the like.
[0024]
The connecting member 43 includes a contact pressure spring 44 made of a torsion coil spring, bent at both ends at substantially right angles to form shafts 44a and 44b, and a guide plate 45 formed in a substantially trapezoidal shape with a metal plate. Each shaft 44a, 44b of the contact pressure spring 44 is made to penetrate through guide holes 45a, 45b penetrating both ends of the lower bottom. A guide hole 45a through which one shaft 44a (hereinafter referred to as “upper shaft”) passes is a round hole, and a guide hole 45b through which the other shaft 44b (hereinafter referred to as “lower shaft”) passes is a guide plate 45. A long hole is formed so that the axial direction of the long axis substantially coincides with the bottom of the bottom.
[0025]
The handle 6 includes an operation unit 6a, a rotation unit 6b, and a handle shaft 6c, and a shaft formed on the inner surface of the first case 1A with a handle shaft 6c protruding from the center of both side surfaces of the rotation unit 6b. A hole 49 and a shaft hole 49 formed on the inner side surface of the second side case 1B are rotatably inserted and pivotally supported between the side cases 1A and 1B. The operation portion 6a is connected to the side cases 1A and 1B. It faces the window hole 50 opened on the upper surface of the container 1 configured in a state where the two are connected. Further, a handle biasing spring 51 made of a torsion coil spring is mounted on the handle shaft 6c, and the handle biasing spring 51 applies the handle 6 in the opening (off) direction at the closing (on) position (see FIG. 8). It is energized.
[0026]
An upper shaft 44a of the contact pressure spring 44 that passes through the guide hole 45a of the guide plate 45 is rotatably inserted into a shaft hole (not shown) provided at the lower end of the rotating shaft 6b, and the handle 6 is connected to the connecting member. 43 is connected.
[0027]
The connecting member 43 is configured such that the lower shaft 44b of the contact pressure spring 44 penetrating the guide hole 45b of the guide plate 45 is rotatably inserted into the bearing holes 30 provided on both sides of the center in the longitudinal direction of the movable contact 4A. It is connected to the movable contact 4 </ b> A and is disposed in the container body 1 so as to be movable up and down.
[0028]
The drive member 40 is formed in a substantially rectangular flat plate shape with an insulating synthetic resin, and is slidable in the vertical direction between the side cases 1A and 1B with the longitudinal direction aligned with the vertical direction (height direction) of the body 1. The upper side of the first side case 1A is provided with a cut groove 40a for fitting the side of the movable contact 4A from the side, and the lower side of the second side case 1B. Are each provided with a cut groove 40b for fitting the movable contact 4B from the lateral direction. Further, a substantially cylindrical fixing portion 40c projects from the end of the lower surface of the drive member 40 on the first case 1A side, and the upper end portion of the opening spring 53 made of a compression coil spring is fitted on the fixing portion 40c. Fixed. Further, as shown in FIG. 5, the standing wall 31 and the isolation wall 14 are provided from the inner side surface of the second side case 1 </ b> B between the standing wall 31 and the isolation wall 14 erected substantially parallel to the isolation wall 14 from the bottom of the second side case 1 </ b> B. The lower end of the opening spring 53 is inserted and fixed in a recess 111 (referred to as “fixed recess”) surrounded by the standing wall 31, the isolation wall 14, and the rib 111a. Therefore, the drive member 40 is disposed in the container 1 in a state where the opening spring 53 is compressed, and is biased upward by the spring force of the opening spring 53 as shown in FIG. . At this time, since both ends of the opening spring 53 are fixed to the fixing portion 40c provided in the driving member 40 and the fixing recess 111 provided in the second side case 1B, the buckling of the opening spring 53 is prevented. Thus, the drive member 40 can be reliably urged.
[0029]
Further, a step portion 56a of a substantially bowl-shaped rib 56 projecting from the inner side surface of the first side case 1A and a recess 40d formed below the cut groove 40a on the side portion of the drive member 40 on the first side case 1A side. The upper step 33a of the vertical wall 33 and the drive member which are in contact with each other and extend vertically from the end surface opposite to the recess 8 of the lateral wall 15 protruding from the inner surface of the second case 1B. 40, the outer flange 40e formed between the recess 40d and the cut groove 40b are in contact with each other, and the upper end of the drive member 40 and the regulation rib 62 projecting from the inner surface of the second case 1B. The movement range of the drive member 40 is regulated by being in contact with and away from the part. Further, guide recesses 34 for guiding the outer flange portion 40 e protruding in the width direction of the container body 1 are provided on the inner side surfaces of the side cases 1 </ b> A and 1 </ b> B in the movement range of the drive member 40.
[0030]
Here, the movable contact 4A is composed of a rigid conductive metal plate, and the movable contact 3A inserted from the side into the kerf 40a of the driving member 40 and caulked and fixed to the tip is separated from the corresponding fixed contact 2A. In addition to being brought into contact with each other, it moves up and down within expectation 1 in conjunction with the vertical movement of the connecting member 43, and presses the opening edge of the kerf 40a to slide the drive member 40 in the vertical direction. Here, since the movable contact 4A is formed of a rigid body, the movable contact 4A hardly bends even in the thickness direction along the moving direction.
[0031]
The movable contact 4B is made of a conductive spring thin plate material and is inserted into the cut groove 40b of the drive member 40 from the side. When the drive member 40 moves downward, the movable contact 4B is pushed downward to bend. When the movable contact 4A is released from the latched state and the upward movement of the drive member 40 is no longer restricted, the movable contact 4A returns and the movable contact 3B that is caulked and fixed to the tip is brought into contact with the fixed contact 2B.・ It is designed to be separated.
[0032]
As shown in FIGS. 3 and 4, the overcurrent trip device 47 includes an electromagnetic drive unit 48 that drives the latch plate 58 when an overcurrent such as a short circuit current flows, and an overcurrent such as an overload current. It is composed of a bimetal 46 that drives the latch plate 58 by bending displacement when flowing. The electromagnetic drive unit 48 includes a fixed iron core 57 formed by bending a magnetic iron plate in a substantially U shape in plan view, a movable iron core that also serves as a latch member 58, and a movable iron core (latch member) 58 on both end magnetic pole surfaces of the fixed iron core 57. The plate spring 59 is configured to be supported in a swingable manner and to elastically bias the movable iron core (latch member) 58 away from the fixed iron core 57.
[0033]
The movable iron core (latch member) 58 is made of a metal material (magnetic iron plate) harder than the metal material (copper alloy) forming the movable contact 4A, and protrudes from the rectangular main portion 58a and the center of the lower edge of the main portion 58a. A side surface shape projecting from the center of the surface opposite to the surface facing the fixed iron core 57 of the main portion 58a and the mounting piece 58b provided, the stopper piece 58c projecting from the center of the upper end edge of the main portion 58A, and And a caulking pin (not shown) inserted through a mounting hole 58d provided through the mounting piece 58b and inserted into a hole 59b formed in the central portion of the central piece 59a of the leaf spring 59. By caulking, the leaf spring 59 is supported so as to be swingable.
[0034]
On the other hand, the leaf spring 59 is inserted into a hole 59e penetrating the lower end portion of the central piece 59a, and a caulking pin 67 is inserted into the hole 46a formed in the lower end portion of the bimetal 46, thereby caulking the bimetal 46 to the lower end of the central piece 59a. Let stand from the part. Further, both side pieces 59c, 59c formed by bending on both sides of the upper end portion of the central piece 59a of the leaf spring 59 are arranged so as to be along the outer surfaces of the both side pieces 57a, 57a of the fixed iron core 57, and the both side pieces 59c, 59c. By locking the locking pieces 59d and 59d that protrude inwardly at the front ends to the recesses 57b and 57b formed at the outer corners of the fixed iron core 57, as shown in FIG. 4, the central piece 59a of the leaf spring 59 is obtained. The leaf spring 59 is fixed to the fixed iron core 57 by interposing the bimetal 46 suspended from the lower end portion between the fixed iron core 57 and the movable iron core (latch member) 58. At this time, the magnetic pole surface which is the tip of both side pieces 57a, 57a of the fixed iron core 57 faces the movable iron core (latch member) 58 through the space between the central piece 59a of the leaf spring 59 and the both side pieces 59c, 59c.
[0035]
In the bimetal 46, the other end of the braided wire 79, one end of which is welded to the movable contact 4A, is welded to a plate surface slightly below the center, and a conductive plate 70 constituting an electric circuit on the voltage electrode side is formed on the upper plate surface. Be joined. The conductive plate 70 made of a metal plate includes an inverted L-shaped main piece 70a, an L-shaped extended piece 70b extending from the upper end of the main piece 70a, and a main piece 70a from the tip of the extended piece 70b. It has a joining piece 70c that extends and an L-shaped fastening piece 70d that extends from the lower end of the main piece 70a. The tip of the joining piece 70c is joined to the bimetal 46, and the lower end of the fastening piece 70d. A blade receiving spring portion 78 sandwiching a voltage bar conductive bar (not shown) disposed in the distribution board is welded and fixed, and the blade receiving spring portion 78, the conductive plate 70, the bimetal 46, the braided wire 79, The movable contact 4A is electrically connected. Thus, when an excessive current such as a short-circuit current flows through the terminal block 10 </ b> A or the conductive plate 70 to the bimetal 46 inserted into the voltage pole circuit, the fixed iron core 57 is excited, and both sides of the fixed iron core 57 are excited. The movable iron core (latch plate) 58 is attracted and swung by the magnetic force generated on the magnetic pole surface at the tip of the pieces 57a and 57a, and the latch portion 60 that latches the rear end portion of the movable contact 4A is moved. Thus, by providing the movable iron core 58 with the latch portion 60 and also serving as a latch member, the number of parts can be reduced, and the assembly work of the overcurrent tripping device 47 into the body 1 can be simplified.
[0036]
On the other hand, in the movable contact 4B on the ground electrode side, a conductive plate 71 constituting an electric circuit on the ground electrode side is welded to the rear end portion. As shown in FIG. 2, the conductive plate 71 made of a metal plate includes a main piece 71a to which the movable contact 4B is welded at one end, a standing piece 71b rising from the other end of the main piece 71a, and a tip of the standing piece 71b. And an L-shaped extending piece 71c extending from the same, and a conductive bar (grounding electrode) disposed in the distribution board at the tip of the extending piece 71c in the same manner as the blade receiving spring part 78 described above. A blade receiving spring portion 81 sandwiching a not shown) is fixed by welding, and the blade receiving spring portion 81, the conductive plate 71, and the movable contact 4B are electrically connected.
[0037]
Thus, when assembling the circuit breaker according to the present embodiment, first, the terminal block 10B is accommodated in the recess 8 of the second side case 1B, and the release handle 17 'is incorporated into the fixed position together with the return spring 21'. Further, the handle 6 is assembled at a predetermined position together with the handle urging spring 51, and the blade receiving spring portion 81 is stored in the upper blade receiving spring storing portion 93 provided above the one end, and the standing piece 71 b of the conductive plate 71 is mounted. It arrange | positions so that the clearance gap between the partition walls 91 and 92 of 2nd side case 1B may be followed. Further, the obliquely upward inclined portion of the central portion of the movable contact 4B is parallel to the bottom from the lower end of the partition wall 92 located slightly above the bottom of the second side case 1B toward the other end of the second side case 1B. Furthermore, it is arranged between the partition wall 95 extended obliquely upward from the parallel part and the bottom part of the second side case 1B, and the free end side of the movable contact 4B is fixed across the standing wall 31 and the isolation wall 14. It arrange | positions in the space where the contact 12B is arrange | positioned. At this time, the main piece 71a of the conductive plate 71 and the rear end portion of the movable contact 4B are fixed by sandwiching the main piece 71a of the conductive plate 71 and the movable contact 4B with a plurality of ribs 96 respectively protruding from the lower surface of the parallel portion of the partition wall 95 and the bottom portion of the second case 1B.
[0038]
The movable contact 4B is sandwiched in the groove 40b of the drive member 40, and both ends of the opening spring 53 are fixed to the fixed portion 40c on the lower surface of the drive member 40 and the fixed recess 111 provided on the bottom of the second case 1B. It arrange | positions in the compression state between the drive member 40 and the 2nd case 1B bottom, and arrange | positions the drive member 40 to the predetermined position of the 2nd case 1B so that sliding movement is possible in the up-down direction. Further, the blade receiving spring portion 78 is accommodated in the blade receiving spring portion accommodating portion 90 located below the upper blade receiving spring portion accommodating portion 93 of the second side case 1B, and is above the partition wall 92 on the inner side surface of the second side case 1B. The upper end portion of the main piece 70a of the conductive plate 70 is fitted into the locking groove 99 provided in the upper portion of the conductive plate 70, and the conductive plate 70 extends into the fitting recess 94 provided on the inner side surface of the second case 1B above the locking groove 99. The conductive plate 70 is housed and fixed in the second side case 1B by fitting the protruding piece 70b, and the conductive plate 70 is fixed to the fixed piece 70d in the space from the center of the partition wall 92 along the longitudinal direction of the second side case 1B. The overcurrent tripping device 47 to which the bimetal 46 is fixed is accommodated. The tip of the stopper piece 58c of the movable iron core (latch member) 58 is brought into contact with the abutting piece 106 projecting from the inner surface of the second case 1B so as to face the fixed piece 70c of the conductive plate 71, thereby moving the movable iron core ( The movement of the latch member 58 is restricted.
[0039]
Further, a portion between the center portion where the bearing hole 30 of the movable contact 4A connected to the bimetal 46 by the braided wire 79 and the tip end portion to which the movable contact 3A is fixed is fitted into the cut groove 40a of the drive member 40. The upper shaft 44a of the contact pressure spring 44 inserted through the guide hole 45a of the guide plate 45 is inserted into the shaft hole of the handle 6, and the lower shaft 44b of the contact pressure spring 44 inserted through the guide hole 45b of the guide plate 45 is movable. The connecting member 43 is connected to the handle 6 and the movable contact 4A through the bearing hole 30 of the contact 4A. At this time, the tip of the lower shaft 44b penetrating the bearing hole 30 of the movable contact 4A is fitted into a guide groove 103 provided along the vertical direction below the shaft hole 49 on the inner surface of the second side case 1B. The lower shaft 44b is guided by the guide groove 103 as the connecting member 43 moves up and down. Further, a positioning projection 105 is formed in the width direction of the second side case 1B in the vicinity of the lower end of the guide groove 103 of the partition wall 95 provided in the second side case 1B, and the handle 6 is operated to the closing position. With the connecting member 43 moving downward and closing the contact portion, the protruding piece 45c provided in the vicinity of the guide hole 45b on the lower side of the guide plate 45 is brought into contact with the positioning protrusion 105 to position the connecting member 43 ( (See FIG. 8).
[0040]
After assembling the intermediate case 7 and the terminal block 10A accommodated in the recess 9 of the intermediate case 7, the release handle 17, and the return spring 21 other than the second case 1B by fitting in the lateral direction, The intermediate case 7 in which the terminal block 10A, the release handle 17 and the return spring 21 are assembled in the recess 9 is disposed so as to overlap the second side case 1B side.
[0041]
Here, when the intermediate case 7 is disposed at a fixed position on the first case 1A side, the tip side portion of the fixed contact 12A provided on the terminal block 10A is placed on the recess 15a of the lateral wall 15. In addition, a shaft (not shown) fits into the recess 37 of the release handle 17 ′.
[0042]
In this state, the first case 1A is overlapped and connected to the second case 1B. At this time, the claw-like hooking portions 101 at the tips of the two elastic locking pieces 100 provided in the height direction up and down and both end directions integrally projecting from the second side case 1B to the first side case 1A side are the first. The first case 1A and the second case 1B are connected and fixed to each other to constitute the container body 1 by being engaged with the protruding hooked portions 102 provided corresponding to the side case 1A side. When disconnecting and fixing the first side case 1A and the second side case 1B, a screwdriver is provided from each release hole (not shown) opened in the first side case 1A corresponding to each hooked portion 102. The hooking portion 101 of each elastic locking piece 100 corresponding to the insertion is pressed (suppressed) upward to release the hooking portion 102 from the hooked portion 102, whereby the second side case 1B to the first side case 1A. Can be removed.
[0043]
Here, a rectangular plate-like rib 110 projecting toward the second side case 1B is formed on the inner side surface above the bottom of the first side case 1A substantially in the longitudinal direction, and the first side case 1A When the container 1 is assembled by connecting the second side case 1B, the braided wire 79 is sandwiched between the tip surface of the rib 110 and the inner side surface of the second side case 1B as shown in FIG. The braided wire 79 can be positioned on one side in the width direction of the bimetal 46 substantially perpendicular to the displacement direction of the bimetal 46 (longitudinal direction of the container 1). For this reason, the braided wire 79 does not get in the way when the bimetal 46, which will be described later, is displaced, and the influence of the braided wire 79 on the displacement characteristics of the bimetal 46 becomes difficult.
[0044]
Now, blade receiving springs 78 and 81 for sandwiching a conductive bar in the vertical direction are provided inside one end in the longitudinal direction of the container 1 constituted by connecting the first and second side cases 1A and 1B as described above. Conductive bar insertion grooves 107 and 108 opened in a U-shape on the end surface and both side surfaces of the container body 1 at one end portion of the container body 1 so as to correspond to the blade receiving spring portions 78 and 81. Will be formed.
[0045]
In addition, a pair of wire insertion holes 16A and 16B opened obliquely upward are formed in parallel at the other longitudinal end of the vessel body 1. Thus, by inserting load-side electric wires into the electric wire insertion holes 16A and 16B and connecting them to the terminal blocks 10A and 10B, and connecting the conductive bars to the blade receiving spring portions 78 and 81, the electric path of this embodiment can be used. A circuit breaker can be inserted.
[0046]
Here, as shown in FIG. 5, the first contact portion composed of the fixed contact 2A and the movable contact 3A and the second contact portion composed of the fixed contact 2B and the movable contact 3B are arranged in parallel in the height direction of the body 1. The container 1 can be downsized in the width direction. In addition, the first contact portion is disposed at substantially the center in the width direction of the container body 1 and the second contact portion is disposed at one end portion in the width direction of the container body 1 (the second side case 1B side end portion). By disposing the opening spring 53 at the other end (the first side case 1A side end) in the width direction of 1, the load applied to the first and second contact portions can be stabilized. As shown in FIG. 1, the first contact portion and the second contact portion are separated by the horizontal wall 15 provided in the second side case 1 </ b> B and the vertical wall 33 and the drive member 40 arranged in parallel with the vertical wall 33. A sufficient insulation distance can be ensured between both contact portions.
[0047]
Next, the operation of this embodiment will be described with reference to FIG. 1 and FIGS.
[0048]
FIG. 1 shows an open (off) state. In this open state, the operation portion 6a of the handle 6 is in an inverted state exposed from the window hole 50, and the rear end portion of the movable contact 4A and the latch portion of the latch member 58 are shown. 60 is in a latched state. The drive member 40 is biased upward (upward in the height direction, hereinafter the same) in the figure of the container 1 by the opening spring 53 and is inserted into the kerf 40a of the drive member 40. 4A is in a state where the free end is moved upward, and the movable contact 4B inserted through the kerf 40b is in a state where the free end is moved upward by its spring elastic force. The provided movable contacts 3A, 3B are in a state (opened state) separated from the corresponding fixed contacts 2A, 2B.
[0049]
When the operation portion 6a of the handle 6 is rotated counterclockwise in the drawing in this state, the upper shaft 44a of the contact pressure spring 44 is pushed downward as shown in FIG. 7, and the connecting member 43 is moved to the contact pressure spring. The movable contact 4A is rotated clockwise with the rear end latched by the latch portion 60 by the lower shaft 44b 44 as a fulcrum, and the movable contact 3A at the free end approaches the fixed contact 2A. In addition, the movable contact 4A is driven by the rotation of the movable contact 4A so that the drive member 40 inserted into the cut groove 40a is driven to move downward, and the movable member inserted through the cut groove 40b of the drive member 40 by this movement. The contact 4B bends in a direction to move the free end downward, and the movable contact 3B at the free end is brought into contact with the fixed contact 3B. Here, the distance traveled until the movable contact 3B contacts the fixed contact 2B (distance between the contacts of the second contact portion in the open state), the distance traveled until the movable contact 3A contacts the fixed contact 2A (first Therefore, the movable contact 3B having a short moving distance until contact comes into contact with the fixed contact 2B first to close the second contact portion (see FIG. 7).
[0050]
When the operation portion 6a of the handle 6 is further rotated counterclockwise, the movable contact 4A is rotated clockwise while further bending the flexible movable contact 4B, and the movable contact 3A is fixed. 2A is contacted and the 1st contact part is closed. If the operation portion 6a of the handle 6 is further rotated counterclockwise from there, the contact pressure from the line connecting the position of the lower shaft 44b of the contact pressure spring 44 and the rotation center of the handle 6 as shown in FIG. The upper shaft 44a of the spring 44 moves rightward in the figure, and in this state, a handle biasing spring 51 that biases the handle 6 clockwise, an opening spring 53 that biases the drive member 40 upward, and a movable contactor The contact pressure spring 44 that biases 4A downward, and the spring force of the movable contact 4B and the like are balanced so that the latched state between the rear end portion of the movable contact 4A and the latch portion 60 of the latch member 58 is maintained. 8 in the on state (on state) is maintained.
[0051]
In this input state, the downward force is applied to the movable contact 4A by the spring force (returning force) of the contact pressure spring 44, and the contact pressure between the movable contact 3A and the fixed contact 2A is obtained by this force. A downward force is also applied to the movable contact 4B via the drive member 40 driven downward, and the contact pressure between the movable contact 3B and the fixed contact 2B is obtained by this force. That is, in this embodiment, contact pressure (contact pressure) can be applied to the first and second contact portions at the time of closing by the contact pressure spring 44 made of a torsion coil spring, and a separate spring for applying contact pressure is required. The number of parts can be reduced and the assembling work into the container 1 can be simplified. Further, in the inserted state, the protruding piece 45 c provided on the guide plate 45 abuts on the positioning projection 105 of the container 1 and the lower shaft 44 b of the contact pressure spring 44 is guided in the guide groove 103 provided on the container 1. By restricting the movement of the lower shaft 44b of the contact pressure spring 44, the movable contacts 3A, 3B and the fixed contacts 2A, 2B can be easily and accurately brought into contact with each other.
[0052]
Now, when the operating portion 6a of the handle 6 is rotated clockwise in the inserted state, the position of the upper shaft 44a of the contact pressure spring 44 is the center of rotation of the handle 6 and the position of the lower shaft 44b of the contact pressure spring 44. When the crossing line is crossed to the left, the balance of the spring force or the like is lost, the connecting member 43 moves upward by the biasing force of the contact pressure spring 44, and the handle 6 is biased by the biasing force of the handle biasing spring 51. Quickly returns to the open (off) side. By moving the drive member 40 upward, the movable contact 4A is pivoted counterclockwise around the rear end latched by the latch portion 60, and the free end is moved upward to move the movable contact 3A from the fixed contact 2A. The first contact portion is opened by opening (see FIG. 7). Further, since the movable contact 4A is rotated counterclockwise, the driving member 40 is driven and moved upward, so that the movable contact 4B is not pushed downward, and is restored to its original state by its spring force. As a result, the movable contact 3B at the free end is separated from the fixed contact 2B to open the second contact portion. Here, as described above, the distance between the contacts of the second contact portion is made shorter than the distance between the contacts of the first contact portion, and the movable contact 4B is formed of a flexible spring material. The movable contact 3A is released from the fixed contact 2A before the bent movable contact 4B returns to the original state and the movable contact 3B is separated from the fixed contact 2B (see FIG. 7), and then the original state. The movable contact 4B that has returned to the position moves the movable contact 3B upward to separate the movable contact 3B from the fixed contact 2B.
[0053]
By the way, even when the movable contact 3B contacts the fixed contact 2A before the movable contact 3B contacts the fixed contact 2B at the time of insertion, the movable contact 4A is made of a rigid body and therefore tries to rotate the handle 6. Since the movable contact 4A does not bend and the drive member 40 cannot move downward any more, the movement of the movable contact 4B is restricted, the movable contact 3B and the fixed contact 2B come into contact with each other, and the second contact portion is closed. Can be prevented. Therefore, at the time of switching from the open state to the closed state, the second contact portion (the fixed contact 2B and the movable contact 3B) on the ground electrode side is more than the first contact portion (the fixed contact 2A and the movable contact 3A) on the voltage electrode side. The contact is always closed first, and when switching from the closed state to the open state, the second contact portion on the ground electrode side is always opened after the first contact portion on the voltage electrode side. As a result, it is possible to prevent a large current from flowing through the second contact part on the grounding pole side or an arc when opening and closing, and an inexpensive non-durable contact material is used for the second contact part on the grounding pole side. it can.
[0054]
Further, since only the connecting member 43 is interposed between the handle 6 and the movable contact 4A, and the movable contact 4A is directly latched by the latch member 58, the number of parts is reduced and the structure is simplified as compared with the conventional case. In addition, the operation of assembling the parts into the container 1 can be facilitated. Here, the latch member 58 is formed of a member (for example, iron) that is harder than the member (for example, copper alloy) that forms the movable contact 4A, and the latch member 58 has a width dimension of the rear end portion of the movable contact 4A. Since the width dimension of the latch portion 60 is increased, it is possible to prevent the rear end portion of the movable contact 4A from sinking into the latch portion 60 of the latch member 58 and to stabilize the load applied to the latch portion 60.
[0055]
Furthermore, the movable contact 4A on the voltage electrode side and the movable contact 4B on the ground electrode side are movable in the same direction (the height direction of the container 1), and the drive member 40 is moved along the moving direction of the movable contacts 4A and 4B. Therefore, the drive member 40 can have a simple structure and can be easily incorporated into the container body 1.
[0056]
Now, when an overcurrent flows through the load in the above-described charging state shown in FIG. 8, the bimetal 46 generates heat due to the overcurrent and is curved and displaced. Here, as shown in FIG. 9, the bimetal 46 suspended from above is displaced so that its lower end moves in the left direction in the figure, and a latch member (movable iron core) connected to the lower end of the bimetal 46 via a leaf spring 59. 58 is rotated clockwise with a stopper piece 58c contacting the contact piece 106 provided on the inner surface of the second case 1B as a fulcrum. As a result, the latch portion 60 provided on the latch member (movable iron core) 58 moves leftward, the latched state of the rear end portion of the movable contact 4A is released, and the driving member 40 is directed upward by the biasing force of the opening spring 53. Therefore, the movable contact 4A rotates counterclockwise about the lower shaft 44b of the contact pressure spring 44, and the movable contact 4B is not pushed down by the drive member 40 and returns to the original state. As shown in FIG. 10, the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively, and the first and second contact portions are forcibly opened. At this time, the movable contact 3A is fixed before the movable contact 3B which is bent in the closed state returns to its original state and the movable contact 3B is separated from the fixed contact 2B in the same manner as in the above opening operation. Since it is separated from 2A, the first contact portion of the voltage electrode is opened before the second contact portion of the ground electrode even during the trip operation due to the overload current.
[0057]
Thereafter, the bimetal 46 returns to the original state by the electric circuit interruption. Further, since the balance of the spring force and the like is lost by releasing the latched state of the rear end portion of the movable contact 4A, the handle 6 is rapidly rotated to the open (off) side by the biasing force of the handle biasing spring 51. The connecting member 43 moves upward while returning.
[0058]
In addition, when an excessive current such as a short-circuit current flows in the input state shown in FIG. 8, a magnetic force is generated in the fixed iron core 57 of the electromagnetic driving unit 48 constituting the overcurrent tripping device 47 and the corresponding movable iron core ( The latch member 58 is sucked and swung. As a result, as in the above-described tripping operation due to the short-circuit current, the latch portion 60 provided on the movable iron core (latch member) 58 moves leftward as shown in FIG. 11, and the rear end portion of the movable contact 4A is latched. Is released and the driving member 40 is moved upward by the biasing force of the opening spring 53, so that the movable contact 4A rotates counterclockwise around the lower shaft 44b of the contact pressure spring 44 and is movable. The child 4B returns to its original state without being pushed down by the driving member 40, and the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B, respectively, and the first and second contact portions are forcibly opened. At this time, the movable contact 3A is bent before the movable contact 3B is released from the fixed contact 2B after the movable contact 4B bent in the closed state returns to the original state as in the case of the trip operation by the short-circuit current. Since it is separated from the fixed contact 2A, the first contact portion of the voltage electrode is opened before the second contact portion of the ground electrode even during the trip operation due to the short-circuit current.
[0059]
Thereafter, when no magnetic force is generated in the fixed iron core 57 of the electromagnetic drive unit 48 due to the electric circuit interruption, the movable iron core (latch member) 58 returns to the original state by the spring force of the leaf spring 59. Further, since the balance of the spring force and the like is lost by releasing the latched state of the rear end portion of the movable contact 4A, the handle 6 is rapidly rotated to the open (off) side by the biasing force of the handle biasing spring 51. The connecting member 43 moves upward while returning.
[0060]
By the way, in the present embodiment, the driving member 40 is biased upward by the opening spring 53, that is, the movable contact 3A is urged away from the fixed contact 2A. When the second contact portion is forcibly opened, the latching state of the movable contact 4A by the latch member 58 is released, so that the connection point between the connecting member 43 and the movable contact 4A (the contact pressure spring 44 The movable contact 4A rotates counterclockwise with the lower shaft 44b) as a fulcrum, and the distance between the contacts in the tripped state is larger than the distance between the movable contact 3A and the fixed contact 2A in the open state (see FIG. 1). It becomes larger (see FIG. 10). As a result, the arc generated at the first contact portion at the time of forced opening can be quickly cut to shorten the opening time.
[0061]
Further, the movable contact 4B formed of a leaf spring is pressed downward and bent when the drive member 40 moves downward, and the latched state of the movable contact 4A is released from this bent state, and the drive member 40 When the upward movement is no longer restricted, it returns, so that when the contact portion is forcibly opened as described above, an upward driving force is applied from the movable contact 4B to the driving member 40, and the first contact portion due to the arc. It becomes easy to prevent welding. Furthermore, since the biasing force of the opening spring 53 acts as a driving force on the driving member 40, it becomes easier to prevent the welding of the first contact portion by the arc.
[0062]
【The invention's effect】
  The invention according to claim 1 is a device housing a main circuit, a handle pivotally supported by the device, a first fixed contact, and a first movable contact contacting and separating from the first fixed contact. A first contact portion inserted into the voltage pole of the main circuit, a second fixed contact, and a second movable contact contacting and leaving the second fixed contact, and inserted into the ground pole of the main circuit.In addition, the first contact portion is juxtaposed in the height direction of the container.A second contact portion, a connecting member connected to the handle, and the first movable contact connected to the connecting member, having the first movable contact at the tip, and turning the handle to the first movable contact. A first movable contact that is formed so as to be difficult to bend in the moving direction of at least the first movable contact.A plate that is movable in the same direction as the first movable contact, has the second movable contact at the tip, and biases the second movable contact in a direction to separate it from the second fixed contact A second movable contact formed by a spring;A latch member for latching a rear end portion of the first movable contact;The first and second movable contacts are arranged to be slidable along the moving direction.Driven by the first movable contactThe second movable contact is moved in a direction in which the second movable contact is in contact with and separated from the second fixed contact.Drive memberWhenAnd a distance for moving the second movable contact when the second contact portion is switched between the open state and the closed state, and a first distance when the first contact portion is switched between the open state and the closed state. Shorter than the distance to move the movable contactIn addition, a first contact portion is disposed at approximately the center in the width direction of the container body, a second contact portion is disposed at one end portion in the width direction of the container body, and the other contact portion in the width direction of the container body. An opening spring for urging the drive member in a direction to open the first and second contact portions is disposed at the end.Therefore, when switching from the open state to the closed state, the second contact portion on the ground electrode side is always closed before the first contact portion on the voltage electrode side, and the closed state is changed to the open state. At the time of switching, the second contact portion on the ground electrode side is surely opened after the first contact portion on the voltage electrode side. As a result, a large current is supplied to the second contact portion on the ground electrode side when opening and closing. Current and arc can be prevented, and an inexpensive contact material that is not highly durable can be used for the second contact portion on the ground electrode side. In addition, since only the connecting member is interposed between the handle and the movable contact and the movable contact is directly latched by the latch member, the number of parts can be reduced and the structure can be simplified as compared with the conventional case. In addition, there is an effect that it is easy to incorporate parts into the container.Furthermore, there is an effect that the drive member has a simple structure and can be easily incorporated into the container. There exists an effect that a container can be reduced in size in the width direction. Further, since the driving force is applied to the driving member by the second movable contact made of a leaf spring at the time of opening, there is an effect that it becomes easy to prevent the welding of the first contact portion due to the arc. Further, since the driving force is applied to the driving member by the opening spring at the time of opening, it becomes easier to prevent the welding of the first contact portion due to the arc, and the load applied to the first and second contact portions is stabilized. There is an effect that can be.
[0063]
  The invention of claim 2 is the invention of claim 1,The opening spring is a compression coil spring interposed between the drive member and the container, and a fixing portion for positioning and fixing the end of the compression coil spring is provided on the drive member and the container, respectively.SoThe buckling of the compression coil spring can be prevented, and the drive member can be reliably biased.There is an effect.
[0065]
  Claim3The invention of claim1 or 2In the invention ofSaidOf the first and second movable contactsEach movable contactThe drive member is disposed closer to the base end side, a lateral wall interposed between the first and second contact portions in a direction substantially orthogonal to the moving direction of the drive member, and the drive member side end surface of the lateral wall from the drive member side end surface Since the vertical wall extending along the moving direction is provided in the container, the first contact portion on the voltage electrode side and the second on the ground electrode side are provided by the horizontal wall and the vertical wall provided on the container and the driving member. There is an effect that a sufficient insulation distance can be secured between the contact portions.
[Brief description of the drawings]
FIG. 1 is a side view showing an opened state of the embodiment, with a first side case removed.
FIG. 2 is an exploded perspective view of the above.
FIG. 3 is an exploded perspective view of the overcurrent trip device in the same as above.
FIG. 4 is a perspective view of the overcurrent trip device in the same as above.
FIG. 5 is a front sectional view of the same.
FIG. 6 is a central sectional view of the above.
FIG. 7 is a side view showing the state during the closing or opening operation, with the first side case removed.
FIG. 8 is a side view showing the throwing state and with the first side case removed.
FIG. 9 is a side view showing the moment when the bimetal is displaced, with the first case removed.
FIG. 10 is a side view showing a state where the bimetal is displaced and the contact portion is forcibly opened, and the first case is removed.
FIG. 11 is a side view showing the moment when the electromagnetic drive unit is operated, with the first side case removed.
[Explanation of symbols]
1 body
2A, 2B fixed contact
3A, 3B movable contact
4A, 4B Movable contact
5 Opening and closing mechanism
6 Handle
40 Drive member
43 Connecting member
44 Contact pressure spring
45 Guide plate
47 Overcurrent trip device
58 Latch member

Claims (3)

A voltage of the main circuit having a container housing the main circuit, a handle pivotally supported by the container, a first fixed contact, and a first movable contact contacting and separating from the first fixed contact A first contact portion inserted into the pole, a second fixed contact and a second movable contact contacting and leaving the second fixed contact , the first contact being inserted into the ground pole of the main circuit a second contact portion that will be juxtaposed in the height direction of the vessel body section, and a connecting member connected to the handle, is connected to the connecting member, the handle having the first movable contact on the tip The first movable contact is formed by moving the first movable contact in the direction of contact with and separating from the first fixed contact by the turning operation and is hardly bent in the moving direction of the first movable contact . The second movable contact is movable in the same direction as the first movable contact and has the second movable contact at the tip. A latch member for latching the second movable contact formed of a leaf spring for urging a point in a direction of opening away from the second fixed contact, the rear end portion of the first movable contact, the first and The second movable contact is arranged in a slidable manner along the moving direction of the second movable contact, and is driven by the first movable contact so that the second movable contact is moved in the direction in which the second movable contact comes in contact with and away from the second fixed contact. and a driving member Before moving the contact, the distance to move the second movable contact when switching the second contact portion to open state and closed state, the first contact portion and the open state When switching to the closed state, the first movable contact is made shorter than the distance to which it is moved , and further, the first contact portion is disposed substantially at the center in the width direction of the body, and one end in the width direction of the body The second contact portion is disposed on the other end portion, and the first and second contact portions are disposed on the other end portion in the width direction of the container body. Circuit breaker, characterized in that it is disposed the started broadcasting spring for urging the driving member in a direction to the station. The opening spring is a compression coil spring interposed between the drive member and the container body, and a fixing portion for positioning and fixing the end of the compression coil spring is provided on each of the drive member and the container body. The circuit breaker according to claim 1. Placing the first and second drive member proximal to the respective movable contacts of the movable contact, in the movement direction in a direction substantially perpendicular to the drive member transverse walls interposed between the first and second contact portions 3. The circuit breaker according to claim 1 or 2, wherein the body is provided with a vertical wall extending along the direction of movement of the drive member from the end surface of the lateral wall on the drive member side.

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