Interlock for vacuum circuit breaker

Abstract

An interlocking device for a vacuum circuit breaker according to an embodiment of the present invention includes a panel having a door formed on a front surface, the door including a handle hole formed to allow an operation handle to be inserted and a release lever formed on an inner side; a transfer trolley including a beam assembly, a bracket movable separated from the beam assembly, a lead screw combined with the beam assembly and the bracket to move the bracket using a rotational force of the operation handle, the transfer trolley being disposed on a bottom surface of the panel to be movable in a front and rear direction inside the panel; and an interlocking unit including a housing fixed to the beam assembly, a button disposed to be slidable to an inside of the housing at one side thereof, and a stopper rotated about a hinge pin by the sliding of the button to restrict the rotational force of the operation handle from being applied to the lead screw. In an embodiment of the present invention, the button is slidable by the release lever when the door is closed.

Description

TECHNICAL FIELD

[0001] The present invention relates to an interlocking device for a vacuum circuit breaker. BACKGROUND

[0002] The vacuum circuit breaker refers to a device for cutting off a circuit while opening and closing an electric current, thereby maintaining safety, in case of abnormal states such as overload and short circuit.

[0003] The vacuum circuit breaker includes a circuit breaker body disposed inside a switchboard, a transfer trolley, and an auxiliary device. More specifically, a door is provided at a front side of the switchboard, a terminal is provided at a rear side of the switchboard, and the transfer trolley is provided at a bottom surface of the switchboard to be movable in a front-rear direction.

[0004] In addition, various mechanical devices are provided at the transfer trolley to enable the circuit breaker body to be selectively moved to the terminal of the switchboard.

[0005] In case that the transfer trolley is moved in while the vacuum circuit breaker is in an on state, a serious safety accident or mechanical damage can occur, and thus a prevention device is required to prevent the transfer trolley from being moved in during the on process of the vacuum circuit breaker.

[0006] Figure 1 is a perspective view of a vacuum circuit breaker having a prior art interlocking device and a door, Figure 2 is Figure 1 is a perspective view of a transfer trolley in Figure 3 is Figure 1 is a perspective view of an interlocking device of Figure 4 is Figure 1 is a sectional view of the interlocking device of

[0007] Referring to Figures 1 to 4 , the vacuum circuit breaker having the prior art interlocking device includes a terminal 120 provided at a switchboard 100, and a circuit breaker body 210 loaded at a transfer trolley 200 and detachably connected to the terminal 120.

[0008] The switchboard 100 is formed in a square box shape, a door 110 is rotatably coupled to one side of a front side of the switchboard 100, and a handle hole 111 is formed at a lower end center of the door 110 to enable the transfer trolley 200 to be moved when an operation handle H is inserted into the handle hole 111 in a state that the door 110 is closed.

[0009] In addition, the transfer trolley 200 is disposed to be movable in a front-rear direction at a bottom surface of the switchboard 100.

[0010] More specifically, the transfer trolley 200 includes a beam assembly 220, a bracket 230 capable of moving separately from the beam assembly 220, and a lead screw 240 combined with the beam assembly 220 and the bracket 230 to receive a rotational force of the operation handle H to move the bracket 230.

[0011] As shown in Figure 3 the lead screw 240, a pressurizing protrusion 241 is angularly formed at a front end thereof to be inserted into a pressurizing groove portion Hl of the operation handle H to receive a rotational force.

[0012] Also, a rotation-preventing protrusion 242 is angularly formed at a rear side of the pressurizing protrusion 241 to be caught by a rotation-preventing groove 225c of a second push plate 225b to be described later, thereby preventing rotation.

[0013] The beam assembly 220 includes a plurality of slide plates 223 disposed to slide in a left-right direction at left and right sides of the lead screw 240, a fixed plate 224 vertically disposed with the lead screw 240 penetrating therethrough and being rotatably combined thereto, a push block 225 elastically supported at the fixed plate 224 and disposed to have the lead screw 240 penetrating therethrough and being movable in a length direction of the lead screw 240, and a cover plate 226 horizontally fixedly combined at an upper end of the fixed plate 224.

[0014] In addition, the push block 225 is composed of a first push plate 225a disposed at a front side, and a second push plate 225b disposed at a rear side of the first push plate 225a at a predetermined interval.

[0015] The rotation-preventing groove 225c is formed at the second push plate 225b to correspond to the rotation-preventing protrusion 242 of the lead screw 240.

[0016] As shown in Figure 3 and Figure 4 an interlocking device 400 is fixedly provided at an upper surface of the cover plate 226 to selectively restrict movement of the push block 225 in a length direction of the lead screw 240.

[0017] The interlocking device 400 is composed of a main body 410 fixedly combined at the cover plate 226, and a slider 410 slidably combined at the main body 410 in a longitudinal direction to restrict movement of the push block 225.

[0018] The slider 410 has a locking protrusion 411 formed to slide in the longitudinal direction.

[0019] The existing interlocking device as described above is operated as follows.

[0020] When the user closes the door 110, the release lever 112 formed inside the door 110 is inserted into the lever hole 412, and thus, the slider 410 moves upward.

[0021] Thus, the locking protrusion 411 of the slider 410 is separated from the moving range of the push block 225.

[0022] That is, the locking protrusion 411 moves in a direction perpendicular to the length direction of the screw 240.

[0023] When the user presses the operation handle H in the rear direction of the panel 100, the push block 225 is pushed in the rear direction to a certain depth.

[0024] Then, the anti-rotation protrusion 242 of the screw 240 is separated from the anti-rotation groove 225c of the push block 225, and the screw 240 becomes a free state.

[0025] Thus, the operation handle H can be inserted into the pressurization protrusion 241 of the screw 240, and the user can rotate the screw 240 by inserting the pressurization protrusion 241 of the screw 240 into the pressurization groove portion H1 of the operation handle H.

[0026] Thereafter, as the bracket 230 engaged with the screw 240 moves to the terminal 120 side, the introduction operation of the vacuum circuit breaker is completed.

[0027] However, in the vacuum circuit breaker having the existing interlocking device, when the release lever 112 is inserted into the lever hole 412 according to the rotational movement of the door 110, a lateral load is also applied, and the weight of the door 110 is heavy, so deformation such as sagging occurs over time, and thus, the relative movement of the release lever 112 and the lever hole 412 frequently occurs.

[0028] Thus, the release lever 112 cannot be accurately inserted into the lever hole 412, not only interference occurs and cannot operate as expected, but also problems such as breakage of the interlocking device 400 or the release lever 112 occur. SUMMARY

[0029] PROBLEMS TO BE SOLVED BY THE INVENTION

[0030] The present invention has been made to solve the above problems, and provides an interlocking device for a vacuum circuit breaker, which can accurately operate without damaging components even in the case where the relative positions of a door and a beam assembly are changed.

[0031] The objects of the present application are not limited to the above-mentioned objects, and other objects and advantages of the present application which are not mentioned can be understood from the following description, and can be more clearly understood from the embodiments of the present application.

[0032] In addition, it is obvious that the objects and advantages of the present application can be achieved by the means shown in the claims and combinations thereof.

[0033] Means for solving the problem

[0034] The interlocking device for vacuum circuit breaker according to the present application includes a distribution panel, a transfer trolley, and an interlocking unit.

[0035] More specifically, the distribution panel is formed with a door in the front aspect, the door including a handle hole formed to allow insertion of an operation handle and a release lever formed in the inner side.

[0036] In addition, the transfer trolley includes a beam assembly, a bracket capable of moving separately from the beam assembly, and a lead screw combined with the beam assembly and the bracket to move the bracket by a rotational force of the operation handle, the transfer trolley being provided at the bottom surface of the distribution panel to be movable in the front-rear direction inside the distribution panel.

[0037] In addition, the interlocking unit includes a housing fixed to the beam assembly, a button provided to be slidable into the housing, and a stopper rotated about a hinge pin by sliding of the button to restrict the rotational force of the operation handle from acting on the lead screw, the interlocking unit being formed to allow the button to slide by the release lever when the door is closed.

[0038] More preferably, the button can be formed to slide in the same direction as the entry direction of the operation handle.

[0039] In addition, an opening portion is formed at the bottom surface of the housing, the opening portion being formed to allow the lower side of the stopper to protrude, and the stopper can be formed to rotate about the hinge pin when the button moves to the rear aspect side of the distribution panel, thereby shortening the length protruding to the opening portion side.

[0040] In addition, a safety pin fastening rib and a safety pin fastening hole capable of fastening a safety pin are respectively formed at the upper side of the housing and the stopper, and the stopper can be restricted from rotating about the hinge pin when the button moves to the rear side of the distribution panel in the case where the safety pin is fastened.

[0041] In addition, a push spring supporting the button to the door side can be provided between the front aspect of the button and the housing.

[0042] In addition, hinge pin fastening portions for the hinge pin to pass through can be formed on both sides of the stop member, and a torsion spring can be provided on either side of the hinge pin fastening portion.

[0043] At this time, the torsion spring is preferably supported at one end by a torsion spring support protrusion formed on one side of the stop member, and at the other end by the inner rear side of the housing.

[0044] The effects of the invention

[0045] The interlocking device for vacuum circuit breakers of the present invention can prevent damage to components and operate accurately even if the relative positions of the door and beam assemblies change due to operational errors of the transfer trolley or component aging.

[0046] In addition to the effects described above, the specific effects of the present invention will be described while explaining the specific aspects of implementing the invention below. Attached Figure Description

[0047] Figure 1 This is a 3D diagram of the existing vacuum circuit breaker's inlet and outlet interlocking device.

[0048] Figure 2 yes Figure 1 A 3D view of the transfer trolley.

[0049] Figure 3 yes Figure 1 A three-dimensional view of the interlocking device.

[0050] Figure 4 yes Figure 1 A cross-sectional view of the interlocking device.

[0051] Figure 5 This is an exploded perspective view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0052] Figure 6 This is a perspective view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0053] Figure 7 This is a front view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0054] Figure 8 This is a top view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0055] Figure 9 This is a bottom view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0056] Figure 10 This is a side sectional view showing the button in the neutral state of an interlocking device for a vacuum circuit breaker according to an embodiment of the present invention.

[0057] Figure 11 FIG. 4 is a side sectional view showing that a button in an interlocking device for a vacuum circuit breaker according to an embodiment of the present application is in a pressed state.

[0058] Figure 12 FIG. 5 is a side sectional view showing that a button in an interlocking device for a vacuum circuit breaker according to an embodiment of the present application is in a pressed state in a state in which a safety pin is inserted. DETAILED DESCRIPTION

[0059] The above objects, features and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art to which the present application pertains can easily implement the technical idea of the present application. In the course of the description of the present application, if it is judged that a detailed description of related art which is known to those skilled in the art can unnecessarily obscure the main idea of the present application, a detailed description thereof will be omitted. Below, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar structural elements.

[0060] Hereinafter, "upper (or lower)" or "up (or down)" of any configuration disposed in a structural element means that any configuration is disposed in contact with a top surface (or a bottom surface) of the structural element, and can also mean that other configurations can be interposed between the structural element and any configuration disposed above (or below) the structural element.

[0061] In addition, it should be understood that if one structural element is described as being "connected", "coupled", or "joined" to another structural element, the structural elements can be directly connected or joined to each other, or other structural elements can be "interposed" between the structural elements, or the structural elements can be "connected", "coupled", or "joined" by other structural elements.

[0062] The singular expression used in the present specification includes the plural expression unless it is clearly specified to the contrary in the context.

[0063] In the present application, the terms "comprise" or "include" should not be interpreted as meaning that the multiple structural elements or steps described in the specification must all be included, but should be interpreted as meaning that a part of the structural elements or a part of the steps can not be included, or additional structural elements or steps can be included.

[0064] Throughout the specification, when it is "A and / or B", it means A, or B, or A and B unless it is specifically stated to the contrary, and when it is "C to D", it means C or less and D or more unless it is specifically stated to the contrary.

[0065] Hereinafter, an interlocking device for a vacuum circuit breaker according to several embodiments of the present application will be described.

[0066] Figure 5 and 6 are an exploded perspective view and a perspective view showing an assembled state of an interlocking device for a vacuum circuit breaker according to an embodiment of the present application, respectively.

[0067] In addition, Figures 7 to 9 are a perspective view, an elevation view, a plan view, and a bottom view of an interlocking device for a vacuum circuit breaker according to an embodiment of the present application, respectively.

[0068] Referring to Figures 5 to 9 , the interlocking device for a vacuum circuit breaker according to the present application includes a distribution panel 100, a transfer trolley 200, and an interlocking unit 300.

[0069] The distribution panel 100 is formed in a cuboid shape as a whole, and includes a door 110 which is opened and closed with respect to a hinge combined to one side edge of a front surface of the distribution panel 100, and a plurality of terminals 120 provided at a rear surface.

[0070] In addition, the door 110 includes a handle hole 111 formed at a lower central side thereof and into which an operation handle H is inserted, and a release lever 112 formed to face an inner space of the distribution panel 100.

[0071] In addition, the transfer trolley 200 is configured to be movable in a front and rear direction on a bottom surface of the inner space of the distribution panel 100.

[0072] More specifically, the transfer trolley 200 includes a beam assembly 220, a carriage 230 which is separably movable from the beam assembly 220, and a lead screw 240 which is combined to the beam assembly 220 and the carriage 230 to receive a rotational force of the operation handle H so as to move the carriage 230.

[0073] In addition, a circuit breaker body 210 which is detachably connected to the terminal 120 is provided at the carriage 230.

[0074] More specifically, the transfer trolley 200 includes a beam assembly 220, a carriage 230 which is separably movable from the beam assembly 220, and a lead screw 240 which is combined to the beam assembly 220 and the carriage 230 to receive a rotational force of the operation handle H so as to move the carriage 230.

[0075] As shown in Figure 3 , a pressurizing protrusion 241 is formed at an angle at a front end of the lead screw 240 to be inserted into a pressurizing groove portion H1 of the operation handle H so as to receive a rotational force.

[0076] And, a rotation preventing protrusion 242 is formed at the rear side of the pressing protrusion 241 at an angle to be caught by a rotation preventing groove 225c of a second push plate 225b to be described later to prevent rotation.

[0077] The beam assembly 220 includes a plurality of sliding plates 223 disposed to slide in the left and right directions at the left and right sides of the lead screw 240, a fixed plate 224 disposed vertically with the lead screw 240 penetrating therethrough and rotatably coupled thereto, a push block 225 elastically supported on the fixed plate 224 and disposed to have the lead screw 240 penetrating therethrough to be movable in the length direction of the lead screw 240, and a cover plate 226 horizontally fixedly coupled to the upper end of the fixed plate 224.

[0078] In addition, the push block 225 includes a first push plate 225a disposed at the front side and a second push plate 225b disposed at the rear side of the first push plate 225a at a predetermined interval.

[0079] The second push plate 225b has a rotation preventing groove 225c formed therein to correspond to the rotation preventing protrusion 242 of the lead screw 240.

[0080] In addition, as shown in Figure 3 and Figure 4 An interlocking unit 300 is fixedly disposed on the upper surface of the cover plate 226 to selectively restrict the movement of the push block 225 in the length direction of the lead screw 240.

[0081] That is, the interlocking device for a vacuum circuit breaker according to the present application has the same or similar configuration of the switchboard 100 and the transfer trolley 200 as the existing interlocking device for a vacuum circuit breaker, but includes an improved interlocking unit 300 compared to the existing vacuum circuit breaker.

[0082] Hereinafter, in the interlocking device for a vacuum circuit breaker according to the present application, the detailed configuration of the interlocking unit 300 will be described as follows.

[0083] As shown in Figure 5 The interlocking unit 300 includes a housing 310 and a button 320, a stopper 330, a button guide pin 340, and a hinge pin 350.

[0084] As shown in Figure 9 An opening portion 311 is formed in the bottom surface of the housing 310, and fixing portions 312 for fastening to the cover plate 226 are formed at both sides of the housing 310.

[0085] That is, the housing 310 can be formed in the shape of a box with the bottom surface open.

[0086] In addition, a button coupling hole 313 into which one side of the button 320 is inserted is formed in the front surface of the case 310.

[0087] More preferably, the button coupling hole 313 is formed by two, and a spring fixing protrusion 314 can be formed between the button coupling holes 313.

[0088] In addition, a button guide hole 315 formed in the moving direction of the button 320, i.e., the front and rear direction, and a hinge pin hole 316 formed in the lower side of the button guide hole 315 to fix the hinge pin 350 are respectively disposed in the both side surfaces of the case 310.

[0089] In addition, a stopper guide hole 317 formed to protrude the upper portion of the stopper 330 to the outside of the case 310, and a safety pin fixing rib 318 formed in the both sides of the stopper guide hole 317 are disposed in the upper surface of the case 310.

[0090] More preferably, the stopper guide hole 317 is formed in the front and rear direction of the case 310 to enable the upper portion of the stopper 330 to rotate in the front and rear direction.

[0091] On the other hand, the button 320 is formed in a Figure 5 shape as shown in , so that one end side is inserted into the button coupling hole 313. In addition, a push spring 321 is provided between the button 320 and the front surface of the case 310.

[0092] In addition, the button 320 is formed with a hole into which the button guide pin 340 is fixed in the side inserted into the inside of the case 310.

[0093] Thus, the button 320 is fixed to the case 310 by the button guide pin 340 penetrating the button guide hole 315 in the state that one end side is inserted into the button coupling hole 313.

[0094] At this time, the button 320 can slide a distance corresponding to the length of the button guide hole 315, and in the case that no external force is applied, can maintain the state of protruding to the front surface direction of the case 310 by the push spring 321.

[0095] On the other hand, the stopper 330 can be assembled in the case 310 through the opening portion 311.

[0096] More specifically, the stopper 330 is formed so that an upper side formed with a safety pin fastening hole 332 protrudes through the stopper guide hole 317, and a lower side protrudes to the outside of the case 310 through the opening portion 311.

[0097] In addition, both side surfaces of the stopper 330 are formed with a hinge pin fastening portion 331 through which the hinge pin 350 is combined.

[0098] Thus, the stopper 330 can be provided to the case 310 by the hinge pin 350 passing through the hinge pin hole 316 and the hinge pin fastening portion 331.

[0099] At this time, a torsion spring 334 is fastened to one side of the hinge pin fastening portion 331, and a torsion spring support protrusion 333 can be formed in one side surface of the stopper 330.

[0100] One end side of the torsion spring 334 is supported in the torsion spring support protrusion 333, and the other end side is supported in the inside rear surface of the case 310. Thus, a force of rotating the hinge pin 350 as a rotation axis to the rear side of the case 310 is applied to the stopper 330.

[0101] In addition, the stopper 330 includes a stopper straight portion 335 which is in contact with the button guide pin 340 in the upper side of the hinge pin fastening portion 331, and a stopper inclined portion 336 which is formed so as to extend downwardly and obliquely to the rear side of the case 310 from the stopper straight portion 335.

[0102] Thus, in the case where the button guide pin 340 is positioned in the front side of the case 310 in the stopper guide hole 317, the state that the stopper straight portion 335 is in contact with the button guide pin 340 is maintained.

[0103] In addition, in the case where the button guide pin 340 is positioned in the rear side of the case 310 in the stopper guide hole 317, the stopper 330 is rotated to the rear side of the case 310 by the torsion spring 334 with the hinge pin 350 as a rotation axis.

[0104] At this time, the rotation distance of the stopper 330 can be limited by the length of the stopper guide hole 317.

[0105] In addition, in a state where the safety pin 360 is fastened with the safety pin fastening rib 318 and the safety pin fastening hole 332 combined, when a force is applied to the rear side of the housing 310 with respect to the button 320, the stopper 330 can maintain a state where the stopper straight portion 335 is in contact with the button guide pin 340 in a case where the button guide pin 340 is positioned at the rear side of the housing 310 in the stopper guide hole 317.

[0106] Figures 10 to 12 are side sectional views showing a state where the button is in a neutral state, a state where the button is in a pressed state, and a state where the button is in a pressed state with a safety pin fastened in an interlocking device for a vacuum circuit breaker according to an embodiment of the present application.

[0107] In addition, in a state where the safety pin 360 is fastened with the safety pin fastening rib 318 and the safety pin fastening hole 332 combined, when a force is applied to the rear side of the housing 310 with respect to the button 320, the stopper 330 can maintain a state where the stopper straight portion 335 is in contact with the button guide pin 340 in a case where the button guide pin 340 is positioned at the rear side of the housing 310 in the stopper guide hole 317. Figures 10 to 12 The same reference numerals are assigned to the same parts in the drawings.

[0108] Referring to Figures 1 to 3 and Figures 10 to 12 the operation of the interlocking device for a vacuum circuit breaker according to the present application is as follows.

[0109] In a state where the door 110 is opened, the button 320 is maintained in a state where it protrudes the most to the front side of the housing 310 by the push spring 321.

[0110] That is, as shown in FIG. 4, the button guide pin 340 is positioned at the front side of the button guide hole 315 and maintained in a state where it is in contact with the stopper straight portion 335. Figure 10

[0111] In addition, the lower side of the stopper 330, which protrudes to the opening portion 311 side, is positioned at the rear side of the push block 225 in a direction perpendicular to the direction in which the transfer trolley 200 moves to the rear side of the switchboard 100.

[0112] Accordingly, the interlocking device for a vacuum circuit breaker according to the present application can prevent the transfer trolley 200 from moving to the terminal 120 side in a state where the door 110 is opened.

[0113] On the other hand, in a case where the door 110 is closed, the release lever 112 presses the button 320 so that the stopper 330 rotates about the hinge pin 350 as a rotation axis, thereby moving the lower side of the stopper 330, which protrudes to the opening portion 311 side, to the inside of the housing 310.

[0114] That is, with the hinge pin 350 as a reference, the stopper 330 rotates in a clockwise direction so that the push block 225 can move to the rear side of the switchboard 100. Figure 11 ​​

[0115] Therefore, even if the relative positions of the door 110 and the beam assembly 220 change due to operational errors or component aging of the transfer trolley 200, the interlocking device for the vacuum circuit breaker of the present invention can prevent damage to the interlocking unit 300 and operate accurately.

[0116] On the other hand, such as Figure 12 As shown, when the safety pin 360 is engaged by passing through the safety pin fastening rib 318 and the safety pin fastening hole 332, and when the door 110 is closed and the release lever 112 presses the button 320, the button guide pin 340 is located behind the button guide hole 315.

[0117] However, the safety pin 360 prevents the stop 330 from rotating, thus keeping the button guide pin 340 in contact with the straight portion 335 of the stop.

[0118] Additionally, the following state is maintained: the lower side of the stop 330 protruding towards the opening 311 is located behind the push block 225 in a direction perpendicular to the direction in which the transfer trolley 200 moves toward the rear side of the distribution panel 100.

[0119] Therefore, even when the door 110 is closed, the safety pin 360 is tightened, preventing the transfer trolley 200 from moving toward the terminal 120.

[0120] As described above, although the invention has been illustrated with reference to the accompanying drawings, the invention is not limited to the embodiments and drawings disclosed in this specification, and various modifications can be made by those skilled in the art within the scope of the invention's technical concept. Furthermore, even if the effects of the configuration according to the invention are not explicitly stated or explained in the preceding description of the embodiments of the invention, it should be assumed that the effects predictable based on the corresponding configuration are valid.

Claims

1. An interlocking device for vacuum circuit breakers, wherein, includes: a distribution panel in which a door is formed in a front surface, the door including a handle hole formed to allow an operation handle to be inserted and a release lever formed in an inner side; a transfer trolley including a beam assembly, a bracket capable of moving separately from the beam assembly, a lead screw combined with the beam assembly and the bracket to move the bracket using a rotational force of the operation handle, the transfer trolley being disposed at a bottom surface of the distribution panel to be capable of moving in a front and rear direction inside the distribution panel; and an interlocking unit including a housing fixed to the beam assembly, a button disposed to have one side capable of sliding into the housing, a stopper rotating about a hinge pin by sliding of the button, the button sliding under the action of the release lever when the door is closed, a safety pin fastening rib and a safety pin fastening hole capable of fastening a safety pin are respectively formed in upper sides of the housing and the stopper to restrict the stopper from rotating about the hinge pin when the button moves to a rear side of the distribution panel with the safety pin fastened, thereby restricting the rotational force of the operation handle from acting on the lead screw. 2.The interlocking device for a vacuum circuit breaker according to claim 1, wherein the button slides in the same direction as an entering direction of the operation handle. 3.The interlocking device for a vacuum circuit breaker according to claim 1, wherein an opening portion is formed in a bottom surface of the housing, the opening portion being formed to allow a lower side of the stopper to protrude, the stopper being formed to rotate about the hinge pin when the button moves to the rear side of the distribution panel, thereby shortening a length protruding to the opening portion. 4.The interlocking device for a vacuum circuit breaker according to claim 3, wherein a push spring supporting the button to the door side is disposed between a front side of the button and the housing. 5.The interlocking device for a vacuum circuit breaker according to claim 3, wherein a hinge pin fastening portion for the hinge pin to pass through is formed in both sides of the stopper, and a torsion spring is disposed in either side of the hinge pin fastening portion. 6.The interlocking device for a vacuum circuit breaker according to claim 5, wherein one end side of the torsion spring is supported by a torsion spring support protrusion formed in one side surface of the stopper, and the other end side of the torsion spring is supported in an inner rear side of the housing.

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