JP6880946B2 - switchboard - Google Patents

Description

The present invention relates to a switchboard provided with an interlock mechanism.

Conventionally, some switchboards are provided with a drawer type circuit breaker movably inside a housing with an opening / closing door (see, for example, Patent Document 1). In this switchboard, the connection state between the power supply and the load-side device is switched by moving the drawer type circuit breaker. In addition, the switchboard is provided with an interlock mechanism. The interlock mechanism prevents the opening / closing door from opening when there is a drawer type circuit breaker at a position where the power supply and the load side device are connected or in the middle of connection. By doing so, the switchboard can protect the human body outside the switchboard even if a short-circuit accident occurs when the power supply and the load-side device are connected or in the process of being connected.

Further, some switchboards are provided with a grounding switch in the housing that can switch the load-side device between a grounded state and a non-grounded state (see, for example, Patent Document 2). The switchboard is provided with a drawer type circuit breaker inside the housing, and also has an opening / closing door in the housing. In this switchboard, when the load-side device is in the grounded state, this state can be maintained by closing the operation port of the grounding switch with a shutter and locking it with a key. The switchboard can be opened only when it is grounded by using a locked key to open the switchboard door.

Japanese Unexamined Patent Publication No. 2008-220070 International Publication No. 2014/010110 Pamphlet

However, the switchboards described in Patent Document 1 and Patent Document 2 described above take into consideration the interlock between the drawer type circuit breaker and the door of the housing, or the interlock between the grounding switch and the door of the housing. However, the interlock between the drawer type circuit breaker and the grounding switch was not taken into consideration. That is, in the switchboards described in Patent Document 1 and Patent Document 2, consideration is given to prevent the circuit breaker from accidentally moving to the operating position when the grounding switch is grounded, or the circuit breaker is operated. There was no consideration to prevent the grounding switch from being accidentally grounded when it was in the position.

The present invention has been made in view of the above, and an object of the present invention is to provide a switchboard that realizes an interlock between a drawer type circuit breaker and a grounding switch.

In order to solve the above-mentioned problems and achieve the object, the power distribution board according to the present invention moves so as to be able to switch the connection state of the connection terminal, the connected portion, the connection terminal, and the connected portion. A drawer type breaker and a grounding switch that can switch the connected portion between a grounded state and a non-grounded state are provided inside the housing, and a grounding insertion port provided in the housing is used for grounding. A power distribution board that switches between a grounded state and a non-grounded state of the connected portion via the grounding switch by inserting and operating the operation handle, and the grounding operation handle is inserted into the grounding insertion port. A grounding shutter that can be moved to a non-insertable position that cannot be inserted and an insertable position that allows the grounding operation handle to be inserted into the grounding insertion port, and a shutter locking portion that moves with the movement of the drawer-type breaker. The shutter locking portion provides the grounding shutter to reach the insertable position when the connection terminal and the connected portion are disconnected due to the movement of the drawer type breaker. It is characterized in that it is arranged at a position where it is possible, and when the connection terminal and the connected portion are in a connected state, it is arranged at a position where the grounding shutter cannot reach the insertable position. To do.

In the switchboard according to the present invention, it is preferable that the grounding shutter is formed so that the locking portion in which the shutter locking portion is locked protrudes.

In the power distribution board according to the present invention, the housing has a breaker insertion port into which the breaker operation handle is inserted, an uninsertable position at which the breaker operation handle cannot be inserted into the breaker insertion port, and the breaker operation. A shutter for a breaker that can be moved to an insertable position that allows the handle to be inserted into the insertion port for the breaker, and a tubular portion that allows the tip of the operation handle for grounding to be inserted through the insertion port for grounding. The tubular portion can be moved to a grounding position where the connected portion is in the grounded state and a non-grounded position where the connected portion is in the non-grounded state via the grounding switch. A locking plate is fixed to the tubular portion so as to be movable with the movement of the tubular portion, and the locking plate is a shutter for a breaker when the tubular portion is in the grounding position. When it is on the movement path and the breaker shutter cannot reach the insertable position, and when the tubular portion is in the non-grounded position, the breaker shutter can reach the insertable position. It is good to be in the position of.

The power distribution board according to the present invention has a connection terminal, a connected portion, a drawer type breaker that moves so that the connection state of the connection terminal and the connected portion can be switched, and the connected portion in a grounded state. A grounding switch that can be switched to a non-grounded state is provided inside the housing, and the grounding operation handle is inserted into the grounding insertion port provided in the housing to operate the grounding. A power distribution board that switches between a grounded state and a non-grounded state of the connected portion via a switch, and the housing has a breaker insertion port into which a breaker operation handle is inserted and a breaker insertion port in the breaker insertion port. A shutter for a breaker that can be moved to a position where the operation handle cannot be inserted and an insertable position where the operation handle for the breaker can be inserted into the insertion port for the breaker, and for the grounding via the insertion port for grounding. A tubular portion into which the tip of the operation handle can be inserted is provided, and the tubular portion has a grounding position that brings the connected portion into the grounded state via the grounding switch, and the connected portion. Is movable to a non-grounded position that makes the non-grounded state, and a locking plate is fixed to the tubular portion so as to be movable with the movement of the tubular portion, and the locking plate is the tubular portion. When the portion is in the grounded position, it is on the movement path of the breaker shutter, making it impossible for the breaker shutter to reach the insertable position, and when the tubular portion is in the non-grounded position. It is characterized in that the shutter for the breaker is in a position capable of reaching the insertable position.

The switchboard according to the present invention includes a tubular main body portion, and the tubular portion fits on the outer circumference of the main body portion and moves in a direction along the central axis of the main body portion with respect to the main body portion. Possible to be provided, urged toward the grounding insertion port side in the direction along the central axis of the main body portion, having a convex portion on the outer peripheral surface, and an annular lock plate on the outer peripheral surface of the tubular portion. It is fitted, and on the inner circumference of the lock plate, a notch-shaped first recess and a second recess into which the convex portion is fitted are formed on the same circumference.
The lock plate has the first recess when the grounding operation handle is inserted into the tubular portion through the grounding insertion port and the tubular portion is pressed in a direction opposite to the urging direction. Alternatively, when the convex portion fitted in the second concave portion is fixed to the main body portion so as to be disengaged, the convex portion is formed when the tubular portion is in the ground contact position. When the tubular portion is fitted in the second recess and the tubular portion is in the non-grounded position, it may be fitted in the first recess and the respective states may be maintained.

According to the above configuration, when the drawer type circuit breaker is located at the position where the connection terminal and the connected portion are connected, the grounding handle cannot be inserted into the grounding insertion port by the grounding shutter. ing. Further, since the shutter locking portion hinders the movement of the grounding shutter to the insertable position, the grounding insertion port cannot be made into an insertable state. Therefore, if there is a drawer type circuit breaker at a position where the connection terminal and the connected portion are connected, the operation of switching the connected portion cannot be performed.

Further, according to the above configuration, when the connected portion is in the grounded state, there is a locking plate in the path where the breaker shutter moves from the non-insertable position to the insertable position, and the breaker shutter can be inserted. Disables movement to. Therefore, when the connected portion is in the grounded state, the drawer type circuit breaker cannot be switched.

FIG. 1 is a front view of a switchboard according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is an enlarged cross-sectional side view of a main part showing the interlock mechanism of the switchboard shown in FIG. FIG. 5 is an explanatory view when the grounding shutter of the switchboard shown in FIG. 1 is in the insertable position. FIG. 6 is an explanatory view when the grounding shutter of the switchboard shown in FIG. 1 is in a position where it cannot be inserted. FIG. 7 is a cross-sectional view taken along the line CC in FIG. FIG. 8 is an enlarged cross-sectional front view of a main part showing the positional relationship between the shutter for the breaker of the switchboard and the locking plate shown in FIG. FIG. 9 is an enlarged cross-sectional side view of a main part showing the front end portion of the grounding operation shaft of the switchboard shown in FIG. FIG. 10 is an enlarged cross-sectional side view of a main part showing the front end portion of the grounding operation shaft of the switchboard shown in FIG. FIG. 11 is an enlarged cross-sectional side view of a main part showing a state in which the grounding operation handle is inserted into the front end of the grounding operation shaft of the switchboard shown in FIG. 1 and pressed. FIG. 12 is a cross-sectional view taken along the line EE in FIG. FIG. 13 is a cross-sectional view taken along the line FF in FIG. FIG. 14 is a front view showing the locking plate of the switchboard shown in FIG.

Hereinafter, preferred embodiments of the switchboard according to the present invention will be described in detail with reference to the accompanying drawings with reference to FIGS. 1 to 14. In this embodiment, for convenience of explanation, the front side of the switchboard will be referred to as the front side, and the back side will be referred to as the rear side.

The switchboard 1 includes a housing 2, a grounding switch 5, and a grounding operation shaft 6. The housing 2 is a rectangular parallelepiped box body, and has a door 2b on the front surface. The door 2b of the housing 2 is provided with a breaker insertion port 11 and a breaker shutter 7, and the housing 2 is provided with a grounding insertion port 12 and a grounding shutter 8. .. The breaker insertion port 11 is a portion into which the breaker operation handle is inserted. The grounding insertion port 12 is a portion into which the grounding operation handle H is inserted.

The breaker shutter 7 is formed in a plate shape. The shutter 7 for a breaker is provided so as to be slidable in the left-right direction with respect to the door 2b. The breaker shutter 7 is movably provided at a position where the breaker insertion port 11 is closed (non-insertable position) and a position where the breaker insertion port 11 is opened (insertable position). The non-insertable position is a position at which the breaker operation handle cannot be inserted into the breaker insertion port 11. The insertable position is a position where the breaker operation handle can be inserted into the breaker insertion port 11.

The grounding shutter 8 is formed in a plate shape. The grounding shutter 8 is provided so as to be slidable in the left-right direction with respect to the housing 2. The grounding shutter 8 is movably provided at a position where the grounding insertion port 12 is closed (non-insertable position) and a position where the grounding insertion port 12 is opened (insertable position). The non-insertable position is a position at which the grounding operation handle H cannot be inserted into the grounding insertion port 12. The insertable position is a position where the grounding operation handle H can be inserted into the grounding insertion port 12. As shown in FIG. 4, a locking convex portion 71 (locking portion) is formed on the back surface of the grounding shutter 8 so as to project toward the back surface side. The locking convex portion 71 is formed in a shape in which a part of the upper part of the grounding shutter is bent rearward.

In the housing 2, a mounting table 2a is arranged on the front side, a connected portion 3 is arranged on the upper side on the back side, and a grounding switch 5 is arranged below the connected portion 3. A drawer type circuit breaker 4 is mounted on the mounting table 2a. The mounting table 2a is provided with a fixing portion 25 so as to hang down from the upper part of the mounting table 2a.

The connected portion 3 is provided above the mounting table 2a in the housing 2 and behind the drawer type circuit breaker 4. The connected portion 3 has an opening into which connection terminals 15 and 16 described later are detachably plugged in. The opening is open toward the front surface of the housing 2. The connected portion 3 has a load-side connected portion 13 and a power supply-side connected portion 14. The power supply side connected portion 14 is arranged on the load side connected portion 13. The load-side connected portion 13 is a portion that is electrically connected to an external load-side device. The power supply side connected portion 14 is a portion connected to an external power supply.

The drawer type circuit breaker 4 includes a rectangular parallelepiped base portion 4a and a portion 4b extending upward from the front end portion of the base portion 4a. Wheels 17 are provided at the four corners of the lower surface of the base portion 4a. The drawer type circuit breaker 4 is mounted on the mounting table 2a of the housing 2 via the wheels 17, and can be moved back and forth. A load side connection terminal 15 and a power supply side connection terminal 16 are provided as two connection terminals on the back side of the portion 4b extending upward of the drawer type circuit breaker 4.

The load side connection terminal 15 and the power supply side connection terminal 16 are arranged so that the connection portions face rearward. The load side connection terminal 15 is provided so as to face the load side connected portion 13, and the power supply side connection terminal 16 is provided so as to face the power supply side connected portion 14. When the pull-out type circuit breaker 4 is arranged at the disconnecting position set in front of the mounting table 2a, the connected portion 4 and the connection terminals 15 and 16 are separated from each other. On the other hand, when the drawer type circuit breaker 4 is moved to the rear operation position, the load side connection terminal 15 is connected to the load side connected portion 13, and the power supply side connection terminal 16 is connected to the power supply side connected portion 14.

As shown in FIG. 4, the first interlock member 22 and the second interlock member 23 (shutter locking portion), which are interlock mechanisms, are below the bottom of the base portion 4a when the drawer type circuit breaker 4 is in the disconnecting position. ) And the rotating plate 24 are installed, and when the pull-out type circuit breaker 4 moves to the operating position, the bottom plate 21 of the pull-out type circuit breaker operates by pressing the interlock member 22 downward.

The first interlock member 22 is formed in a rectangular parallelepiped shape. As shown in FIG. 4, the first interlock member 22 extends in the vertical direction and is arranged in the fixing portion 25 so as to be vertically movable within a certain range. When the first interlock member 22 is located at the upper limit, the upper portion thereof is arranged so as to project upward from the upper surface of the mounting table 2a. The first interlock member 22 is urged upward. When the drawer type circuit breaker 4 moves from the disconnecting position to the operating position, the bottom plate 21 of the drawer type circuit breaker 4 presses the upper surface of the first interlock member 22 downward in the process, and the first interlock member 22 is pushed downward. Move. When the drawer type circuit breaker 4 moves from the operating position to the disconnecting position, the bottom plate 21 of the drawer type circuit breaker 4 also moves from the rear to the front, and the first interlock member 22 is released from the pressure of the bottom plate 21 and moves to the upper limit. To do.

The second interlock member 23 is formed in a rod shape and is arranged on the front side of the first interlock member 22. The second interlock member 23 extends in the front-rear direction and is arranged in the fixing portion 25 so as to be movable in the front-rear direction within a certain range. The rear end of the second interlock member 23 is connected to the first interlock member 22 via a rotating plate 24. The front end portion of the second interlock member 23 exists in the movement path of the grounding shutter 8 when the drawer type circuit breaker 4 is in the operating position. The front end portion of the second interlock member 23 is arranged at a position that makes it impossible to reach the insertable position of the grounding shutter 8 when the drawer type circuit breaker 4 is in the operating position. The second interlock member 23 exists at a position where the entire second interlock member 23 is retracted from the moving path of the grounding shutter 8 when the pull-out type circuit breaker 4 is in the disconnecting position. The second interlock member 23 is arranged at a position capable of reaching the insertable position of the grounding shutter 8 when the pull-out type circuit breaker 4 is in the disconnecting position.

The rotating plate 24 is arranged on the front side of the first interlock member 22 and on the rear side of the second interlock member 23. The rotary plate 24 is provided with a first support shaft 31, a second support shaft 32, and a rotary shaft 33 in parallel with each other. The first support shaft 31, the second support shaft 32, and the rotation shaft 33 have a straight line connecting the first support shaft 31 and the rotation shaft 33 and a straight line connecting the second support shaft 32 and the rotation shaft 33 at approximately 90 degrees. It is arranged at the intersecting position. The rotating plate 24 is connected to the first interlock member 22 via the first support shaft 31, and is connected to the rear end portion of the second interlock member 23 via the second support shaft 32. The rotary plate 24 rotates about the rotary shaft 33. The rotating plate 24 is pivotally supported by the rotating shaft 33 on the fixing portion 25 of the housing 2. As the rotary plate 24 rotates about the rotary shaft 33, the first support shaft 31 moves up and down, and the second support shaft 32 moves back and forth. Therefore, as the rotating plate 24 rotates, the first interlock member 22 moves up and down, and the second interlock member 23 moves back and forth.

The grounding switch 5 switches the connected portion 3 between a grounded state and a non-grounded state. Here, the grounded state means a state in which the load-side connected portion 13 is grounded, and the non-grounded state means a non-grounded state in which the load-side connected portion 13 is not grounded. When the grounding switch 5 is in the "open" state, it is in the non-grounded state, and when it is in the "closed" state, it is in the grounded state. The grounding switch 5 is operated by inserting the grounding operation handle H into the grounding insertion port 12.

The grounding operation shaft 6 is arranged below the upper surface of the mounting table 2a and extends in the front-rear direction. The rear end of the grounding operation shaft 6 is connected to the grounding switch 5. When the grounding operation shaft 6 is rotated, the grounding switch 5 opens and closes. At the front end of the grounding operation shaft 6, a tubular fitting portion 40 (main body portion) to which the grounding operation handle H can be attached and detached is formed via the grounding insertion port 12. A tubular portion 41 is rotatably fitted to the outer periphery of the fitting portion 40 so as to be integrally with the grounding operation shaft 6.

As shown in FIGS. 10 and 11, the tubular portion 41 is provided so as to be movable with respect to the fitting portion 40 in a direction along the central axis of the fitting portion 40. The tubular portion 41 is urged by a spring 44 on the grounding insertion port 12 side in the direction along the central axis of the fitting portion 40. The tubular portion 41 is urged by a spring 44 in the front direction of the grounding operation shaft 6. The tip of the grounding operation handle H can be inserted into the front opening of the tubular portion 41 via the grounding insertion port 12. The tubular portion 41 can be rotationally moved to a grounding position in which the connected portion 3 is in the grounded state and a non-grounded position in which the connected portion 3 is in the non-grounded state via the grounding switch 5.

A plate-shaped locking plate 42 is fixed to the front end of the tubular portion 41. The locking plate 42 is arranged so as to project outward from the outer circumference of the tubular portion 41. On the surface of the locking plate 42, a display unit 45 displaying "grounding" and "OFF" is formed. The display unit 45 is arranged toward the front. Two protrusions 43 (convex portions) are provided on the outer periphery of the tubular portion 41. The protrusion 43 is provided so that the tubular portion 41 is symmetrical in the left-right direction with respect to the central axis of the tubular portion 41 when the tubular portion 41 is in the non-grounded position. A rectangular and annular first lock plate 51 and a second lock plate 52 are fitted on the outer circumference of the tubular portion 41.

As shown in FIG. 12, the first lock plate 51 is formed with a fitting hole 61 into which the tubular portion 41 is fitted. Holding recesses 62, 63, 64, 65 into which the protrusions 43 are fitted are formed on the inner circumference of the first lock plate 51. The holding recesses 62, 63, 64, and 65 are formed in a shape notched outward from the inner circumference of the fitting hole 61. There are four holding recesses 62, 63, 64, 65 in the cross direction, a first holding recess 62 (second recess), a second holding recess 63 (first recess), and a third holding recess 64. (Second recess) and fourth holding recess 65 (first recess) are provided. The holding recesses 62, 63, 64, 65 are provided on the same circumference. The first lock plate 51 is fixed to the lock plate fixing portion 53 of the housing 2.

As shown in FIG. 13, the second lock plate 52 is formed with a fitting hole 66 into which the tubular portion 41 is fitted. A second recess 67 into which the protrusion 43 is inserted is formed on the inner circumference of the second lock plate 52. The second recess 67 is formed in a shape notched outward from the inner circumference of the fitting hole 66. The second recess 67 has a shape cut out in an arc shape having a central angle of 90 degrees. The second recess 67 is formed at two positions symmetrically with respect to the central axis of the grounding operation shaft 6. The second lock plate 52 is fixed to the lock plate fixing portion 53 of the housing 2.

(Action)
When the drawer type circuit breaker 4 is in the operating position, the connected portion 3 is in a non-grounded state. Further, the grounding shutter 8 is in a position where it cannot be inserted. Then, the second interlock member 23 is in a position that prevents the grounding shutter 8 from moving to the insertable position. That is, as shown in FIGS. 3 and 6, the front end portion of the second interlock member 23 exists in the movement path of the locking convex portion 71 of the grounding shutter 8 and reaches the position where the grounding shutter 8 can be inserted. Is disabled. Therefore, when the drawer type circuit breaker 4 is in the operating position, the connected portion 3 cannot be brought into the ground state. Therefore, it is possible to prevent accidental grounding.

From this state, the breaker knob 72 is operated to move the breaker shutter 7 to an insertable position, and the breaker operation handle is inserted into the breaker insertion port 11. In this state, when the operation handle for the circuit breaker is rotated, the pull-out type circuit breaker 4 moves from the rear operating position to the front disconnecting position. At that time, the first interlock member 22 pressed downward by the bottom plate 21 of the pull-out type circuit breaker 4 is returned upward by a spring. Along with this, the rotating plate 24 rotates clockwise in FIG. 3 about the rotating shaft 33, and the second interlock member 23 moves rearward. Therefore, when the pull-out type circuit breaker 4 is in the disconnecting position, the second interlock member 23 is located at a position away from the grounding shutter 8 as shown in FIG. 4, and the grounding knob 73 is operated to ground. The shutter 8 can be moved from the non-insertable position to the insertable position.

In this state, the breaker operation handle is pulled out, and the breaker knob 72 is operated to move the breaker shutter 7 to a position where it cannot be inserted. After that, the grounding shutter 8 is moved from the non-insertable position to the insertable position, and the grounding operation handle H is inserted into the grounding insertion port 12. In the non-grounded state, the protrusion 43 is fitted by the holding recesses 63 and 65 on the first lock plate 51 and cannot be operated in the grounded state, but the grounding operation handle H is inserted and the protrusion 43 is second-locked. When pressed to the position of the plate 52, the protrusion 43 and the holding recesses 63 and 65 are disengaged, and the grounding operation shaft 6 can be rotated 90 ° to the right. When pressed to the position of the second lock plate 52, the protrusion 43 is inserted into the second recess 67, and in this state, the grounding operation shaft 6 can be rotated clockwise by a maximum of 90 degrees. When the grounding operation handle H is rotated in the state where the grounding operation handle H is pressed in the insertion direction to rotate the grounding operation shaft 6 by 90 degrees, the grounding switch is "closed" and the connected portion 3 is closed. It will be in a grounded state. At this time, the tubular portion 41 is in the ground contact position, and the end portion of the locking plate 42 is in a state of being present in the moving path of the breaker shutter 7 as shown by the alternate long and short dash line in FIG. In this state, the breaker shutter 7 cannot reach the insertable position. In this state, a display indicating that the display unit 45 is grounded is arranged at the display position.

Therefore, it is possible to prevent the drawer type circuit breaker 4 from being accidentally set to the operating position when the connected portion 3 is in the grounded state, and it is possible to prevent a ground fault. Further, at this time, when the grounding operation handle H is stopped to be pressed in the insertion direction, the tubular portion 41 is urged to the front side, so that the protrusion 43 fits into the holding recesses 62 and 64. , The grounding operation handle H and the grounding operation shaft 6 cannot be rotated. Therefore, this state is maintained.

In order to move the drawer type circuit breaker 4 to the operating position from this state, the grounding operation handle H is inserted into the grounding insertion port 12 again, and the grounding operation handle H is pressed in the insertion direction as described above. Is rotated 90 degrees counterclockwise. Then, the grounding switch 5 is "open" and the connected portion 3 is not grounded. Further, the tubular portion 41 is also located at the non-grounded position, the locking plate 42 is also rotated 90 degrees, and as shown by the solid line in FIG. 7, it is located at a position where it does not interfere with the breaker shutter 7. That is, the locking plate 42 is in a position that enables the breaker shutter 7 to reach the insertable position. In this state, the display "OFF" of the display unit 45 is arranged at the display position.

Then, the grounding operation handle H is removed, and the grounding shutter 8 is moved to a position where it cannot be inserted. In this state, the breaker shutter 7 is moved to a position where it can be inserted. Then, when the disconnector operation handle is inserted into the disconnector insertion port 11 and rotated in the direction opposite to the previous one, the disconnector type circuit breaker 4 moves from the disconnecting position to the operating position. Along with this movement, the bottom plate 21 of the pull-out circuit breaker 4 presses the first interlock member 22 downward. The first interlock member 22 moves downward, the rotating plate 24 rotates accordingly, and the second interlock member 23 moves forward. Therefore, the second interlock member 23 moves to a position that prevents the grounding shutter 8 from moving to the insertable position. That is, the front end portion of the second interlock member 23 is located on the path through which the locking convex portion 71 passes when the grounding shutter 8 moves to the insertable position. Therefore, when the grounding shutter 8 is moved to the insertable position, the front end portion of the second interlock member 23 comes into contact with the locking convex portion 71 of the grounding shutter 8, and the grounding shutter 8 can be inserted. Cannot be moved to. Therefore, when the drawer type circuit breaker 4 is located at the operating position, the connected portion 3 cannot be brought into the ground state, and a short circuit can be prevented.

1 Switchboard 2 Housing 3 Connected part 4 Draw-out type breaker 5 Grounding switch 6 Grounding operation shaft 7 Breaker shutter 8 Grounding shutter 11 Breaker insertion port 12 Grounding insertion port 13 Load side connected part 14 Power supply Side connected part 15 Load side connection terminal 16 Power supply side connection terminal 21 Interlock convex part 23 Second interlock member 42 Locking plate

Claims (4)

The connection terminal, the connected portion, the drawer type circuit breaker that moves so that the connection state of the connection terminal and the connected portion can be switched, and the connected portion can be switched between the grounded state and the non-grounded state. A grounding switch is provided inside the housing.
A switchboard that switches between a grounded state and a non-grounded state of the connected portion via the grounding switch by inserting a grounding operation handle into the grounding insertion port provided in the housing. hand,
A grounding shutter that can be moved to a position where the grounding operation handle cannot be inserted into the grounding insertion port and an insertable position where the grounding operation handle can be inserted into the grounding insertion port, and the drawer. It is equipped with a shutter locking part that moves with the movement of the shape breaker.
The shutter locking portion is a position that enables the grounding shutter to reach the insertable position when the connection terminal and the connected portion are disconnected due to the movement of the drawer type circuit breaker. When the connection terminal and the connected portion are connected to each other, the grounding shutter is arranged at a position that makes it impossible for the grounding shutter to reach the insertable position .
The housing has a breaker insertion port into which a breaker operation handle is inserted, an uninsertable position at which the breaker operation handle cannot be inserted into the breaker insertion port, and the breaker operation handle at the breaker insertion port. It is provided with a breaker shutter that can be moved to an insertable position and a tubular portion into which the tip of the grounding operation handle can be inserted through the grounding insertion port.
The tubular portion can be moved to a grounding position where the connected portion is in the grounded state and a non-grounded position where the connected portion is in the non-grounded state via the grounding switch.
A locking plate is fixed to the tubular portion so as to be movable as the tubular portion moves.
When the tubular portion is in the grounding position, the locking plate is on the movement path of the breaker shutter, making it impossible for the breaker shutter to reach the insertable position, and the tubular portion. there wherein when in the non-ground position, switchboard, characterized in positions near Rukoto which allows reaching the insertable position of the breaker shutter. The switchboard according to claim 1, wherein the grounding shutter is formed so that a locking portion for locking the shutter locking portion projects. The connection terminal, the connected portion, the drawer type circuit breaker that moves so that the connection state of the connection terminal and the connected portion can be switched, and the connected portion can be switched between the grounded state and the non-grounded state. A grounding switch is provided inside the housing.
A switchboard that switches between a grounded state and a non-grounded state of the connected portion via the grounding switch by inserting a grounding operation handle into the grounding insertion port provided in the housing. hand,
The housing has a breaker insertion port into which a breaker operation handle is inserted, an uninsertable position at which the breaker operation handle cannot be inserted into the breaker insertion port, and the breaker operation handle at the breaker insertion port. It is provided with a breaker shutter that can be moved to an insertable position and a tubular portion into which the tip of the grounding operation handle can be inserted through the grounding insertion port.
The tubular portion can be moved to a grounding position where the connected portion is in the grounded state and a non-grounded position where the connected portion is in the non-grounded state via the grounding switch.
A locking plate is fixed to the tubular portion so as to be movable as the tubular portion moves.
When the tubular portion is in the grounding position, the locking plate is on the movement path of the breaker shutter, making it impossible for the breaker shutter to reach the insertable position, and the tubular portion. When is in the non-grounded position, the switchboard is in a position capable of reaching the insertable position of the breaker shutter. Equipped with a tubular body
The tubular portion is fitted to the outer periphery of the main body portion, is provided so as to be movable with respect to the main body portion in a direction along the central axis of the main body portion, and is provided in a direction along the central axis of the main body portion. It is urged to the grounding insertion port side and has a convex portion on the outer peripheral surface.
An annular lock plate is fitted on the outer circumference of the tubular portion.
On the inner circumference of the lock plate, a notch-shaped first recess and a second recess into which the convex portion is fitted are formed on the same circumference.
The lock plate has the first recess when the grounding operation handle is inserted into the tubular portion through the grounding insertion port and the tubular portion is pressed in a direction opposite to the urging direction. Alternatively, the convex portion fitted in the second concave portion is fixed to the main body portion so as to be disengaged.
The convex portion fits into the second concave portion when the tubular portion is in the grounded position, and fits into the first concave portion when the tubular portion is in the non-grounded position. and, switchboard of claim 1, wherein each state is characterized in that it is held.

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