JP6142422B2 - Circuit breaker removal structure - Google Patents

Description

  The present invention relates to a structure for removing a circuit breaker from a bus bar of a distribution board. In particular, the present invention relates to a structure for easily removing a branch circuit breaker that is plugged in and connected to the bus bar from a state of being electrically connected to the bus bar.

The distribution board incorporates a circuit breaker such as a main switch, a bus connected to the secondary side of the main switch, and a branch circuit breaker connected to each of the buses in the cabinet, and draws in an electric circuit. Used as a mouth device. In residential distribution boards for homes, etc., a plurality of branch circuit breakers are arranged in parallel on the secondary side of the main switch, and an AC 50 Hz or 60 Hz single-phase two-wire circuit (100 V), or a single-phase three-wire system. In general, an electric circuit (100 / 200V) is applied.

In recent years, an increasing number of residential distribution boards are configured by connecting a plug-in type branch circuit breaker to a bus. In such a distribution board, a plug-in type branch circuit breaker placed on the mounting plate is directed in the direction of the bus with respect to the bus provided on the mounting plate arranged inside the cabinet. As the bus is inserted into the plug-in terminal fitting, the connection state is established.On the other hand, when the branch circuit breaker is pulled out in the direction away from the bus, the bus is removed from the plug-in terminal fitting. It is pulled out and is in a removed state.

When removing the branch circuit breakers arranged in parallel in the distribution board from the busbars, it is necessary to manually pull the branch circuit breaker away from the busbars. There is a device disclosed in Patent Documents 1 to 3.

The device for removing the breaker from the main bar of the distribution board disclosed in Patent Document 1
The operating member (53) is pivotally attached to the support member (52) disclosed in Patent Documents 2 and 3, and the protrusion (56) of the breaker (55) is engaged with the locking portion (54) of the operating member (53). For a configuration in which the operation member (53) is rotated, the contact (58) of the breaker (55) is pushed out from the main bar (59) by the pushing portion (57), The locking portion 54, the pushing portion 57, and the shaft portion 60 of the operation member 53 are easily damaged early, and when a plurality of narrow breakers 55 are arranged, the interval between the operation members 53 is narrowed and rotated. This is an invention made in view of the problem that it becomes difficult, the same number of operation members 53 as the breakers 55 are required, the number of parts and the number of assembling steps increase, and the manufacturing cost of the detachment device 51 increases. Since the apparatus for removing the breaker from the main bar of the distribution board disclosed in Patent Document 1 is made of a flexible insulating material such as synthetic resin or rubber, an effect such as being hard to break can be expected.

JP 2010-226881 A JP 2004-147375 A JP 2004-147376 A

The device for removing the breaker is formed on the back side of the insertion hole (18) when the operation member D is pushed into the back side of the insertion hole (18) formed in the block (12 of Patent Document 1). Since the operating member D is engaged with the engaging portion (19) and the flexible portion (17) is deformed to the outside of the block, the operating member D forms a guide wall forming a part of the insertion hole (18). While being pushed along (20), the flexible portion (17) acts on the breaker by being pushed outward according to the thickness of the operation member D.
For this reason, the operation member D is required to be thick enough to push the breaker 4 out of the main bar 6, and it is difficult to remove the operation member D when the operator does not have a driver as the operation member D suitable for use. Is expected. In addition, if the thickness of the driver used for the work is different, the amount of deformation of the flexible portion (17) to the outside with respect to the insertion amount becomes unclear, and if a thin screwdriver is used for the insertion hole, the guide wall 20 side This necessitates an operation that requires a driver to lie down and makes the operation complicated. Further, the flexible portion (17) is interposed between the opposing primary side end faces 4a of the upper and lower branch breakers, and it is difficult to visually confirm the movement of the flexible portion (17) deforming outward. Therefore, there is a possibility that the operator's feeling of operation is reduced. In addition, since the shape of the engagement portion at the back of the insertion hole (18) is determined in accordance with the shape of the tip portion of the driver D, the length in the insertion direction of the block (12) is necessary, and the front side from the bus bar The size of the direction increases.

Therefore, the present invention has been made in view of the above problems, and the operation for removing the circuit breaker from the busbar is simple, the removal can be surely performed, the structure is simple, and the circuit breaker to be removed is easily identified. An object of the present invention is to provide a circuit breaker detachment structure that can be used.

The circuit breaker detaching structure according to the present invention is configured to solve the above-mentioned problems, and the circuit breaker detaching structure according to claim 1 is formed in the longitudinal direction of both ends of the bus, In the thin plate-shaped busbar cover that covers a part of the upper surface side of the circuit breaker to which the power source side terminal is inserted and connected from the width direction of the short side with respect to the upper surface side of the busbar and the both ends longitudinal direction of the busbar,
The bus bar cover includes a base portion extending in the longitudinal direction at a central portion in the width direction of the short side,
A removal operation piece provided on the upper surface side of the power supply side terminal portion of each circuit breaker is provided for each circuit breaker at a position biased in both lateral directions from the base,
The removal operation piece is integrally formed in substantially the same plane as the bus cover,
In the width direction of the short side, a positioning recess is formed on the side far from the base portion by a shaft portion having the longitudinal direction as a rotation axis, and positioning the operation tool from the upper surface side on the side closer to the base portion. And the central portion of the central portion of the concave portion and the protruding portion of the extruded projecting piece is on the upper surface side rear surface side. while Ru provided so as to be disposed substantially on the same line in the direction, the base, configured by providing a fixing lug to the bus, the legs against the pressure from the upper side,
When the leg portion is formed with a protrusion in the width direction of the short side, engages with a bus bar supporting member that insulates and supports the bus bar in the width direction, and pushes the removal operation piece to push out the circuit breaker. By receiving the reaction force of
When the pressing portion is pressed, the removal operation piece bends to the bottom side, and the push-out protruding piece contacts and slides on the edge of the power supply side terminal portion of the body of the circuit breaker , The circuit breaker is pushed out from the bus bar, and the plug-in connection of the power supply side terminal of the circuit breaker is released.

According to such a configuration,
Since the removal operation pieces are arranged at positions deviated in the direction of the circuit breaker around the base, the circuit breaker to be removed can be reliably recognized from the parallel circuit breakers. Since the shaft part with the longitudinal direction as the rotation axis is provided on the side far from the base part and the pressing part from the upper surface side is provided on the side closer to the base part, a large amount of pressing movement and pushing amount are ensured by pressing from the upper surface side In addition, since the removal operation piece is integrally formed in substantially the same plane as the bus cover, it is possible to provide a circuit breaker mounting structure in which the structure can be easily provided.

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In addition , since the mounting and fixing portion to the busbar and the leg portion that resists pressing from the upper surface side are provided, unnecessary bending of the busbar cover itself against pressing from the upper surface can be prevented, and reliable removal operation is performed. Can be done.

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Further , since the leg portion is projected in the width direction of the short side and engaged with the bus bar supporting member in the width direction, the bus bar cover is moved in the short side direction when the extruded projecting piece and the circuit breaker slide. It is possible to prevent the extrusion amount from being relatively reduced by bending, and a reliable detachment operation can be performed.

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Further , the operator can accurately position the tool used for the operation of removing the circuit breaker at a predetermined position, efficiently transmit the pressing force to the extruding protrusion piece, and perform a reliable removing operation.

According to a second aspect of the present invention, in the first aspect , the identification number of the circuit breaker is integrally formed on the power supply side terminal upper surface side of each of the circuit breakers at a position deviated from the base in both lateral directions. It is what is done.

According to the second aspect of the present invention, the operator can quickly identify the circuit position of the circuit breaker to be removed from other circuit breakers, thereby improving work efficiency.

According to a third aspect of the invention, in claim 2, the identification number of the circuit breaker, the circuit breaker comprising a removable target by the detachment operation lever, the circuit breaker does not become detachment subject, type Is described.

According to the third aspect of the present invention, it is possible to visually distinguish between a circuit breaker that is a removal operation target and a circuit breaker that is not a removal target, and work efficiency can be improved.

As described above, according to the present invention, it is easy to remove the circuit breaker from the busbar, the removal can be performed reliably, the structure is simple, and the circuit breaker to be removed can be easily identified. A container removal structure can be provided.

The internal unit front view in the distribution board for houses which shows 1st Embodiment is shown. The perspective view when attaching a branch circuit breaker to the internal unit which concerns on the embodiment is shown. The principal part enlarged view when attaching a branch circuit breaker to an internal unit is shown. The perspective view when a branch circuit breaker is attached to the internal unit is shown. The principal part cross-sectional perspective view of the removal operation piece vicinity is shown. The principal part cross-sectional side view of an internal unit is shown. The perspective view in a bus-bar cover single-piece | unit is shown. The perspective view at the time of describing the identification number in a bus-bar cover single-piece | unit is shown. The perspective view in the bus-bar cover single-piece | unit in a multicircuit is shown. The circuit breaker in a prior art example is shown. The circuit breaker in a prior art example is shown.

Next, an embodiment of the present invention will be described in detail with reference to FIGS.

The circuit breaker detaching structure includes a mounting plate that is mounted and fixed inside the cabinet of a residential distribution board, a bus bar fixing base provided on the mounting plate, a bus bar of each pole that is mounted on the bus bar fixing base, and a bus bar. The branch circuit breaker 1 to be connected and the bus cover 2 provided on the front side of the bus to insulate the bus from the outside are provided on the bus cover 2 of the internal unit 100 that is integrated. Is.

Thereafter, the side close to the bus of the vessel constituting the outline of the branch circuit breaker is the power supply terminal side, the side away from the bus is the load terminal side, the side of the operation unit provided in the vessel is the front side, A description will be given by assuming that the mounting surface side to the mounting plate provided with the bus bar is the bottom surface side, and the direction in which these branch circuit breakers are arranged in parallel is the width direction of the body. In addition, the longitudinal direction of both ends of the busbar is the same as the width direction of the branch circuit breaker body, and the short direction of the busbar is the longitudinal direction of the branch circuit breaker body, that is, the power supply terminal-load terminal. It shall be the same as the direction of the intermediate side.

(Description of internal unit)
The internal unit 100 includes a lower mounting plate 4 and an upper mounting plate 3 that is mounted on the lower mounting plate 4 and mounts internal devices on the front side as mounting plates to be attached to the cabinet. The base of is constructed.
The lower mounting plate 4 is formed by bending a metal plate, and the upper mounting plate 3 is formed by resin molding. The lower mounting plate 4 and the upper mounting plate 3 are attached by fitting a protrusion provided at a position corresponding to the mounting hole in the upper mounting plate into a mounting hole provided in the lower mounting plate 4. Done.

The upper mounting plate 3 is provided with a bus fixing base 41 standing at the center of the upper mounting plate 3 in the longitudinal direction of both ends of the bus, that is, in the direction in which the branch circuit breakers 1 are juxtaposed. , 5b, 5c) are held in a state where insulation is maintained over the longitudinal direction of both ends of the bus. The upper mounting plate 3 is provided with a mounting portion 42 for mounting the branch circuit breakers 1 arranged side by side. The mounting portion 42 is formed so as to protrude substantially in the same direction as the width of the branch circuit breaker 1 in the power supply side-load side direction of the branch circuit breaker 1 and prevents the fluctuation in the width direction. The portion 43 and the center portion of the guide portion 43 are openly projecting in a direction away from the bus bar and engaged with a recess provided on the bottom surface side of the branch circuit breaker 1 to prevent the mounting surface side-front surface from rising. A hook portion 44 is formed.

In the longitudinal direction of both ends of the bus bar in the upper mounting plate 3, the branch circuit breakers 1 are placed side by side on both sides of the bus bar. Branch lines (5a1, 5b1, 5c1,...) For supplying power from the bus to each of the branch circuit breakers 1 mounted in parallel are placed on the branch circuit breaker 1. When the branch circuit breaker formed on the mounting portion 42 is connected to the branch line, power is supplied to the branch circuit breaker.

(Description of branch circuit breaker)
The branch circuit breaker 1 mounted on the mounting portion 42 has a longitudinal direction of the body constituting the outer shell as a power supply terminal side-load terminal side, and a plug-in connected to the bus on the power supply side. A plurality of terminal fittings are provided, and a quick connection terminal fitting to which an electric wire from a load circuit is connected is provided on the load side. An electric circuit is formed between the power supply side terminal and the load side terminal via a contact opening / closing mechanism. The contact opening / closing mechanism can be operated to open / close the contact by operating the operation unit 13 linked to the opening / closing mechanism from the outside of the body of the branch circuit breaker, and when detecting an abnormal current flowing in the electric circuit, The contact is automatically opened by the action of a thermal element or an electromagnetic trip element.

A lock lever 16 that engages with the lower mounting plate 4 is provided on the load terminal side of the branch circuit breaker 1 in order to prevent the branch circuit breaker 1 from moving in a direction away from the bus bar. The lock lever 16 is provided inside the branch circuit breaker 1 so as to be slidable in the direction from the front side to the bottom side. It can be operated by holding the finger hook portion 161 so that it can be selectively taken. In addition, an engaging portion for engaging the device of the branch circuit breaker and the lock lever is provided at each position so that the protruding state and the non-projecting state can be stably maintained. When the branch circuit breaker is attached to the internal unit, the lock lever 16 protrudes from the bottom surface side and engages with the bent end of the lower mounting plate 4 so that the branch circuit breaker 1 moves in a direction away from the bus. Is regulated.

Two plug-in terminals 11 (11a, 11b) are provided on the power supply side of the branch circuit breaker 1, and are connected to any two of the buses (5a, 5b, 5c) of each pole. As a result, power having a predetermined voltage value is supplied. For the buses (5a, 5b, 5c) of each pole held on the bus bar fixing stand 41 erected from the upper mounting plate 3, branch lines (5a1 in FIG. 3) extending from the buses to the branch circuit breaker side. , 5b1, 5c1), one branch line 5a1 is disposed on the side closer to the upper mounting plate 3 from the bottom surface side to the front surface side, and two bus bars 5b1 on the front side of the bus bar 5a1. And 5c1 are arranged at the same height in the width direction of the branch circuit breaker.

The branch circuit breaker 1 is supplied with power by being connected to 5a1 and 5b1 or 5a1 and 5c1 with 5a1 being common among these branch lines. Specifically, in FIG. 3, 5a1 and 5b1 are first and second voltage electrodes (L1, L2), 5c1 is a neutral electrode (N), and buses are arranged, and the branch circuit breaker 1 is When connected to the branch lines 5a1 and 5b1, a voltage of 200V is supplied, and when the branch circuit breaker 1 is connected to 5a1 and 5c1, 100V is supplied.

(Description of busbar cover)
On the front side of the bus bar fixing base 41, a bus bar cover 2 that covers a part of the bus bar and the power supply terminal side of the branch circuit breaker 1 is disposed. The bus cover 2 is a resin cover formed in a substantially flat plate shape, and is used as an insulating means for preventing direct contact from the front side of the cabinet to the bus that is the charging unit, and is connected to the bus. The branch circuit breaker is used as a means for removing the branch circuit breaker that maintains insulation and facilitates removal.

The bus cover 2 is formed in a thin plate shape along the longitudinal direction of both ends of the bus. The fixing to the bus bar fixing base 41 is performed with the mounting fixing part 217 to the bus bar provided on the bus bar cover 2 as a support. The mounting and fixing portion 217 is formed with a hole through which a screw passes, and is fixed by being screwed with a fixing screw 23 into a screw hole provided on the bus bar. Further, in a fixed state, a plurality of hooks 411 provided on the bus bar fixing base 41 side at the end of the bus bar cover 2 so that the bus bar cover does not fall off at once when the fixing screw is removed. The bus-bar fixing base 42 and the bus-bar cover 2 are engaged and held by engaging the engagement hole 22 with the hook provided in the bus-bar cover 2. Only the engagement of the bus bar fixing base 41 and the bus bar cover 2 by the hook 411 may be removed to access the terminal screw located at the lower part of the bus bar cover 2.

(Removal structure of circuit breaker)
The bus cover 2 includes a base 210 extending in the longitudinal direction of both ends of the bus at the widthwise center of the bus, and a power supply side of the circuit breaker at a position deviated from the base 210 in both lateral directions. A removal operation piece 21 provided for each of the circuit breakers is integrally formed on the upper surface side of the terminal portion. The removal operation piece is formed in substantially the same plane as the bus bar cover 2 and is supported by a shaft portion 214 having the longitudinal direction as a rotation axis on the side far from the base portion 210 in the lateral width direction. . The removal operation piece 21 is displaced from the initial state formed in the same plane toward the bottom surface side from the front surface side, and thereby is displaced toward the bottom surface side with the shaft portion 214 as the rotation center.

Moreover, the said removal operation piece 21 is a pressing part for showing the operation part when pressing from an upper surface side in the width direction of the short side of the bus-bar cover 2 in the side close | similar to the said base part 210 rather than the said shaft part 214. 211 is formed. On the back surface side of the pressing portion 211, there is provided an extrusion protruding piece 212 that is continuously tapered in a direction away from the bus bar.

When the removal operation piece 21 is pressed from the upper surface side, the extrusion projecting piece 212 is displaced to the bottom surface side together with the removal operation piece 21. That is, the extrusion protruding piece 212 starts to be displaced toward the bottom surface with the shaft portion 214 as the rotation center, and is gradually displaced away from the bus bar from the initial state. Therefore, when the pushing operation piece 212 is pressed from the upper surface side, the pushing operation piece 212 is displaced while abutting and sliding on the edge of the power supply terminal portion of the body of the branch circuit breaker 1 connected to the bus. The circuit breaker is pushed out in the direction away from the bus.

The removal operation piece 21 is formed in a substantially triangular shape that tapers as it approaches the base as viewed from the upper surface side, but may be formed in a semicircular shape or a quadrangular shape.

On the back side of the busbar cover 2, a leg portion 213 is formed in a ridge shape in the short direction of the busbar so as to be substantially flush with the mounting fixing portion 217. The length of the bus bar in the short direction and the length of the leg portion 213 in the short direction are formed to be substantially the same length, and are fitted into a portion of the mounting fixing base 41 that accommodates the bus bar. .

Although the bus cover 2 is formed in a thin plate shape, the following measures are taken against bending and breakage when pressed from the upper surface side. Since the attachment fixing portion 217 and the leg portion 213 are located on the bus bar, it is possible to resist pressing from the upper surface side and to reduce unnecessary bending. Further, when the leg portion 213 is engaged with the edge of the bus bar fixing base 41 in the short side direction of the bus bar, an operation when pressing the removal operation piece from the upper surface to push out the branch circuit breaker 1 is performed. It is possible to reduce the bending of the bus in the short direction by receiving the force.

(Regarding the positioning recess for the operation tool)
In the pressing portion of the removal operation piece 21, a recess for positioning is formed to such an extent that the tip of a screwdriver used as an operation tool is engaged. By pressing with a normal electric tool carried by an electrician, the removal operation piece 21 can be easily pushed down. Further, since the depression can be pushed down by engaging the tip portion of the electric tool, the thickness of the driver used for the operation can be allowed to some extent.

Moreover, the removal operation pieces 21 arranged side by side are alternately arranged on the side of the circuit breaker to be removed. That is, they are arranged in the width direction of the bus bar on the side of the circuit breaker to be removed with the base 210 as the center. For this reason, among the circuit breakers arranged in parallel, the operator can clearly grasp which circuit breaker is to be removed by the removal device, and work in high places and dark places. Even in this case, the possibility of operating the branch circuit breaker that is not the target of operation by mistake is reduced.

(About the circuit breaker identification number)
In the bus cover 2, an identification number 215 for identifying a branch circuit breaker to be removed is described for each place where the removal operation piece 21 is provided. The identification number is described at each end of the bus cover 2 in the short direction and is described so as to be close to the branch circuit breaker connected to the bus, facing from the upper surface side. The identification numbers are described in order from 1 by the number of branch circuit breakers connectable to the internal unit 100 by numbers. These identification numbers may be described so as to coincide with the load circuit numbers in the distribution board. Thereby, for example, when changing the voltage of the construction circuit, the circuit number to be changed can be quickly collated with a design drawing or the like, and work efficiency and work accuracy can be increased. In this embodiment, the identification number 215 is integrally formed with the bus cover.

In addition, for the purpose of distinguishing the circuit breaker to be removed from the removal operation piece 21 from the circuit breaker not to be removed, the type of the identification number is changed. The internal unit 100 of the distribution board is often provided with a primary feed circuit and a spare circuit connected to the internal unit 100, but among these, the removal operation piece 21 does not make a removal target. The circuit breaker is distinguished by describing the identification number in alphabet instead of the number. Depending on where the distribution board is installed, it may be necessary to work in high places or dark places. In such cases, the primary feed circuit and the spare circuit may be used as an auxiliary means to easily distinguish them from normal circuits. it can.

FIG. 9 shows a bus cover 2 used for a multi-circuit distribution board. When there are multiple circuits, it becomes somewhat difficult to specify the branch circuit breaker to be removed, but the identification number 215 is described at the end of the bus cover 2 in correspondence with the branch circuit breaker. The branch circuit breaker to be removed can be easily identified.

(Installation of branch circuit breaker)
In operating the circuit breaker detaching structure, the case where the branch circuit breaker 1 is attached to the inner unit 100 will be described first. First, in FIGS. 2 and 3, the lock lever 16 of the branch circuit breaker 1 is not protruded from the bottom surface side of the branch circuit breaker, and the branch circuit breaker 1 is placed between the guide portions 43 of the upper mounting plate 3. Placed on. In this state, fluctuations in the width direction of the branch circuit breaker are suppressed to some extent.

Subsequently, when the branch circuit breaker is slid along the guide portion 43 in the direction of the bus, the hook portion 44 of the upper mounting plate 3 is engaged with the hooked portion 16 provided on the bottom side of the branch circuit breaker. As a result, the movement of the branch circuit breaker in the bottom side-front side direction is suppressed. When the sliding is further performed, the plug-in terminals 11a and 11b on the power source side are inserted into the branch lines 5a1 and 5b1 of the bus, and the electrical connection between the bus and the plug-in terminal is completed.

When the finger hooking portion 161 of the lock lever 16 is pressed from the front side toward the upper mounting plate, that is, toward the bottom surface side, and the engaging portion of the lock lever protrudes from the bottom surface side, the lower mounting plate is folded. The curved portion and the lock lever are engaged, and movement of the branch circuit breaker in the direction away from the bus is restricted. This completes the operation of attaching the branch circuit breaker to the internal unit 100. (Fig. 4)

(Removal of branch circuit breaker)
Next, the case where the branch circuit breaker 1 is removed from the internal unit 100 by operating the circuit breaker removal structure will be described. First, the finger hooking portion 161 of the lock lever 16 is pulled up to the front side, and the engagement between the lock lever 16 and the lower mounting plate 4 is released. When the engagement between the lock lever 16 and the lower mounting plate 4 is released, the restriction that the branch circuit breaker 1 moves away from the busbar is released. In this state, the restriction in the direction in which the branch circuit breaker 1 moves away from the bus is maintained by the force with which the plug-in terminal 11 pinches the bus.

Subsequently, the operation portion 213 of the removal operation piece 21 is pressed from the front side to the bottom side. When the pressing force overcomes the bending force of the shaft portion of the detaching operation portion 21 formed integrally with the busbar cover 2, the detaching operation piece 21 begins to gradually change elastically in the bottom surface direction, and the pressing portion 211 The extrusion protruding piece 212 formed on the back surface side comes into contact with the edge of the power supply side terminal portion of the branch circuit breaker 1.

When the pressing portion 211 is further pressed from this state, the push-out protrusion 212 presses the branch circuit breaker 1 in a direction to remove it from the bus bar, and finally the plug-in terminal 11 resists the force of pinching the bus bar. Begins to displace the branch circuit breaker 1 away from the bus. And when the displacement of the branch circuit breaker 1 exceeds the amount of insertion between the branch line (5a1, 5b1) of the bus and the plug-in terminal (11a, 11b), the branch line breaker (5a1, 5b1) The plug-in terminals (11a, 11b) are disconnected and the electrical connection between the bus and the branch circuit breaker is released.

In this state, the branch circuit breaker 1 is no longer restricted in the direction away from the bus, and the branch circuit breaker 1 is removed from the bus by pulling the branch circuit breaker 1 lightly away from the bus. Removed from.

The tapered shape of the extruded protruding piece 212 is such that when the pressing portion 211 is pressed and the removal operation piece 21 is deformed, the displacement amount in the short direction of the bus cover of the extruded protruding piece 212 is the branch circuit. It is good to comprise so that it may become larger than the insertion amount to the branch line of the bus-line of the plug-in terminal in the circuit breaker 1. FIG. In addition, in this embodiment, the amount of displacement from the front side to the bottom side, and the displacement in the direction in which the branch circuit breaker moves away from the bus bar so that a good operational feeling can be obtained by matching the pressing amount and the pushing amount. The angle is configured so that the elevation angle of the tapered shape seen from the short direction of the bus is about 45 degrees so that the quantity is about 1: 1.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in order to reduce the bending of the bus bar cover 2, a rib may be provided upright at an end portion in the short direction of the bus bar cover. As shown in FIG. 5, a peripheral rib may be provided upright around the detaching device constituted by the elastic piece 21. The busbar cover 2 covers the front side of the power supply side terminal portion of the branch circuit breaker. By providing the busbar cover 2 at a height of a margin between the busbar cover and the power supply side terminal portion, the longitudinal direction of the busbar cover is provided. In addition, the bending strength in the case can be improved, and the risk of unwanted objects entering between the bus cover and the circuit breaker can be reduced.

Further, the bus cover 2 may be configured to have a function of measuring a voltage supplied to the branch circuit breaker.
When a measurer performs voltage measurement, the measurer performs measurement using a voltage measuring instrument. The voltage measuring instrument uses a voltmeter or the like, but usually has a measuring terminal (test lead). The voltage supplied to the branch circuit breaker can be measured by connecting the test lead to the pole to which the branch circuit breaker is connected (L1 pole and L2 pole, or L1 station 1 and N pole).

The plug-in terminal 11b of the branch circuit breaker 1 is selectively connected to 5b1 (L2 pole) or 5c1 (N pole) among the branch lines of the bus, and the plug-in terminal 11a is connected to the branch line 5a1 of the bus. Therefore, the voltage supplied to the branch circuit breaker can be measured by measuring the voltage between these plug-in terminals.

Two holes 252 corresponding to one branch circuit breaker are formed in the direction away from the bus bar of the detachment device as a measurement portion that leads to one pole for connecting the test leads. The hole 252 is provided on the front side of the plug-in terminal 11b on the power supply terminal side of the branch circuit breaker 1, and a measurement terminal (test lead) is inserted into the plug-in terminal part from the front side. The diameter of the hole is such that it can be contacted.

These two formed holes correspond to the branch lines (5b1 and 5c1) of the buses to which the branch circuit breaker 1 is selectively connected, and are only on the front side of the holes on the side of the connected branch lines. The test lead can be inserted into the plug-in terminal.

As the measurement part that leads to the other pole for connecting the test leads, the branch circuit breakers arranged in parallel on one side of the bus in the longitudinal direction of both ends of the bus are connected to the common bus, so these branch circuits A common measurement terminal for the circuit breaker may be provided in the vicinity of the extension of the bus bar in the longitudinal direction. The common measurement terminal is provided on the bottom side of the common voltage measurement terminal insertion hole indicated by 253 formed in the bus cover 2 in FIG.

These holes 252 and the common voltage measurement terminal insertion hole 253 are formed symmetrically with respect to the base 210 in the longitudinal direction of both ends of the bus. When a measurer performs voltage measurement, one test lead is inserted into the common voltage measurement terminal insertion hole 253a and the test lead is brought into contact with the common voltage measurement terminal for the branch circuit breaker on one side in the longitudinal direction of both ends of the bus. In this state, the other test lead is inserted into the hole 252a on the side where the plug-in terminal 11b is located in each branch circuit breaker and brought into contact with the plug-in terminal 11b, and the voltage supplied to the corresponding branch circuit breaker Measure.

Further, in the direction away from the bus bar of the hole 252, the voltage display confirmation hole 26 extends across the width direction of the branch circuit breaker so that the voltage display (100 V or 200 V) in the branch circuit breaker 1 can be seen from the front side. Is provided. In the figure, the voltage supplied to each branch circuit breaker is described. However, when the branch circuit breaker 1 is actually used, only one of the voltage displays according to the arrangement position of the plug-in terminal ( 100V or 200V) can be visually recognized from the front side, and therefore the voltage display visible from the voltage display confirmation hole of the bus cover 2 is only one voltage display.

At the time of voltage measurement, since the value of the voltage to be supplied is displayed from the voltage display confirmation hole 26, the voltage value is compared with the voltage value measured by the voltage measuring instrument. It is possible to easily grasp whether the connection state of the branch circuit breaker is appropriate.

In this way, in addition to the circuit breaker removal structure, the bus cover 2 has both a voltage measurement function and a voltage display function, thereby providing a distribution board equipped with a more excellent bus cover for electrical safety. It becomes possible to do.

DESCRIPTION OF SYMBOLS 100 Internal unit 1 Branch circuit breaker 11 Power supply side plug-in terminal 12 Load side terminal 13 Operation handle 14 Bottom face side 16 Lock lever 17 Body edge part 2 Power supply side terminal part of branch circuit breaker Busbar cover 21 Removal operation Piece 210 Base 211 Pressing portion 212 Extrusion protruding piece 213 Leg 214 Shaft 215 Identification number 216 Identification number 217 Mounting fixing portion 22 Hole portion 23 Fixing screw 252 Voltage measurement hole 253 Common voltage measurement terminal insertion hole 3 Lower mounting plate 4 Upper mounting Plate 411 Hook 41 Busbar fixing base 42 Placement part 43 Guide part 44 Hook part

Claims (3)

Formed in the longitudinal direction of both ends of the busbar, and covers a part of the upper surface side of the circuit breaker to which the power supply side terminal is inserted and connected from the width direction of the short side to the upper surface side of the busbar and the longitudinal direction of both ends of the busbar In the thin plate-shaped busbar cover,
The bus bar cover includes a base portion extending in the longitudinal direction at a central portion in the width direction of the short side,
A removal operation piece provided on the upper surface side of the power supply side terminal portion of each circuit breaker is provided for each circuit breaker at a position biased in both lateral directions from the base,
The removal operation piece is integrally formed in substantially the same plane as the bus cover,
In the width direction of the short side, it is pivotally supported by a shaft portion having the longitudinal direction as a rotation axis on the side far from the base portion,
A pressing portion in which a positioning recess for positioning the operation tool from the upper surface side is formed on the side closer to the base, and
The extrusion projecting piece tapering in the direction away from the bus bar on the back surface side of the pressing portion is arranged so that the center portion of the concave portion and the projecting portion of the extrusion projecting piece are substantially collinear in the upper surface side back surface direction. while Ru provided so as to be arranged, the base, configured by providing a fixing lug to the bus, the legs against the pressure from the upper side,
When the leg portion is formed with a protrusion in the width direction of the short side, engages with a bus bar supporting member that insulates and supports the bus bar in the width direction, and pushes the removal operation piece to push out the circuit breaker. By receiving the reaction force of
When the pressing part is pressed, the removal operation piece bends to the bottom side,
When the protruding protruding piece abuts and slides on the edge of the power supply side terminal portion of the circuit breaker body, the circuit breaker is pushed out from the busbar, and the connection of the power supply side terminal of the circuit breaker is connected. Circuit breaker removal structure characterized by being released. In a position biased in both lateral directions from the base,
2. The circuit breaker detachment structure according to claim 1 , wherein an identification number of the circuit breaker is integrally formed on a power supply side terminal upper surface side of each of the circuit breakers. Identification number of the circuit breaker,
The circuit breaker detachment structure according to claim 2, wherein the circuit breaker to be removed by the removal operation piece and the circuit breaker not to be removed are described in different types.

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