WO2021014808A1 - Leakage protection device and distribution board - Google Patents

Abstract

The purpose of the present disclosure is to achieve minimization. This leakage protection device (1) is provided with a plurality of opening and closing units (2), a board (B1), a leakage detection unit (3), and a driving unit (4). The plurality of opening and closing units (2) correspond one-to-one to a plurality of contact point units (P0) inserted in electric paths (L1-L3) having a plurality of phases. The leakage detection unit (3) detects the leakage pertaining to the conductive paths (L1-L3) having the plurality of phases. The driving unit (4) operates in response to the detection result of the leakage by the leakage detection unit (3) and opens the plurality of contact point units (P0). The plurality of opening and closing units (2) are arranged in parallel in one direction, and form a first opening and closing unit (U1). Any one and the remaining two among the board (B1), the leakage detection unit (3), and the driving unit (4) are separately arranged on both sides of the first opening and closing unit (U1) in one direction.

Description

Leakage protection device and distribution board

This disclosure generally relates to an earth leakage protection device and a distribution board. More specifically, the present disclosure relates to an earth leakage protection device that opens a contact portion according to an earth leakage detection result, and a distribution board provided with the earth leakage protection device.

Patent Document 1 discloses an electric leakage protection device installed in a house or the like and configured to cut off an electric circuit on the load side when an electric leakage on the load side is detected in the electric circuit between the system power supply and the load. The earth leakage protection device includes a breaker, an earth leakage detection device, and a protective cover. The earth leakage detection device is arranged on the side of the breaker. The earth leakage detection device includes a detection device housing, a load-side terminal unit, an earth leakage detection unit, and a drive unit. The leakage detection unit is composed of a zero-phase current transformer, two substrates, and the like.

JP-A-2017-76554

By the way, since the leakage protection device of Patent Document 1 has a relatively large dimension in the left-right direction (one direction), it may be desired to reduce the size of the leakage protection device.

The present disclosure has been made in view of the above reasons, and an object of the present disclosure is to provide an earth leakage protection device and a distribution board that can be miniaturized.

The earth leakage protection device of one aspect of the present disclosure includes a plurality of opening / closing parts, a substrate, an earth leakage detection part, and a driving part. The plurality of opening / closing portions have a one-to-one correspondence with a plurality of contact portions inserted into the plurality of phase electric circuits, and by opening the corresponding contact portions, the electric circuits of the corresponding phases are switched from the conductive state to the cutoff state. .. One or more electronic components are mounted on the substrate. The earth leakage detection unit detects an earth leakage related to the multi-phase electric circuit. The driving unit operates according to the detection result of the electric leakage in the electric leakage detecting part, and opens the plurality of contact parts. The plurality of opening / closing portions are arranged side by side in one direction to form an opening / closing unit. Any one of the substrate, the earth leakage detection unit, and the drive unit, and the remaining two units are separately arranged on both sides of the opening / closing unit in the one direction.

The distribution board of one aspect of the present disclosure includes the above-mentioned earth leakage protection device and a housing for accommodating the above-mentioned earth leakage protection device.

FIG. 1 is a conceptual diagram of an earth leakage protection device according to an embodiment. FIG. 2 is an external perspective view of the earth leakage protection device as seen from above. FIG. 3 is an external perspective view of the earth leakage protection device as seen from below. FIG. 4 is a perspective view of the above-mentioned leakage protection device in a state where the first block and the second block are separated. FIG. 5 is a cross-sectional view of the same leakage protection device. FIG. 6 is a perspective view seen from the right with a part of the earth leakage protection device of the above removed. FIG. 7 is a perspective view seen from the right with a part of the earth leakage protection device of the above removed. FIG. 8 is a perspective view seen from the left with a part of the earth leakage protection device of the same as above removed. FIG. 9 is a perspective view of a main part of the same leakage protection device. FIG. 10 is a cross-sectional view of a main part of the same leakage protection device. FIG. 11 is a schematic cross-sectional view of the distribution board according to the embodiment.

(1) Outline Each figure described in the following embodiments is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Not necessarily.

The earth leakage protection device 1 (see FIG. 1) according to the present embodiment includes a plurality of opening / closing units 2, a substrate B1, an earth leakage detection unit 3, and a drive unit 4. Further, the distribution board 100 (see FIG. 11) according to the present embodiment includes an earth leakage protection device 1 and a housing 101 for accommodating the earth leakage protection device 1. The distribution board 100 is, for example, a distribution board for a house, and is attached to a construction surface T11 such as a wall T1 (see FIG. 11) in the house, but is not limited to the distribution board for a house. The distribution board 100 may be a non-residential distribution board for office buildings, commercial facilities, hotels, hospitals, factories, schools, and the like.

The plurality of opening / closing portions 2 (three in this case) of the earth leakage protection device 1 correspond one-to-one with a plurality of contact portions P0 inserted into the multi-phase electric circuits. Each opening / closing unit 2 switches the electric circuit of the corresponding phase from the conductive state to the cutoff state by opening the corresponding contact portion P0. Here, as an example, it is assumed that the power supply system from the system power supply is a three-phase four-wire system, and the earth leakage protection device 1 is configured to be applicable to the three-phase four-wire system power supply system. Therefore, as shown in FIG. 1, the "multi-phase electric circuit" includes, for example, an R phase (first phase) electric circuit L1, an S phase (second phase) electric circuit L2, and a T phase (third phase) electric circuit. It is assumed that it is composed of the electric circuit L3 of. Hereinafter, the contact portion P0 inserted into the R-phase electric circuit L1 is referred to as a first contact portion P1, and the contact portion P0 inserted into the S-phase electric circuit L2 is referred to as a second contact portion P2, and is referred to as a T-phase electric circuit. The contact portion P0 inserted into L3 may be referred to as a third contact portion P3.

As shown in FIG. 1, a plurality of electronic components E1 (may be one) are mounted on the substrate B1 of the earth leakage protection device 1. The leakage detection unit 3 detects a leakage related to a plurality of phases of electric circuits (L1 to L3). The leakage detection unit 3 includes a zero-phase current transformer 30 (ZCT: Zero-phase-sequence Current Transformer).

The drive unit 4 operates according to the detection result of the electric leakage in the electric leakage detection unit 3 and opens a plurality of contact parts P0. The plurality of opening / closing portions 2 are arranged side by side in one direction (left-right direction in FIG. 1) to form an opening / closing unit (first opening / closing unit U1). The earth leakage protection device 1 includes a second opening / closing unit U2 (opening / closing unit X0) adjacent to the left side of the first opening / closing unit U1. The opening / closing portion X0 opens the contact portion P0 (referred to as the fourth contact portion P4) inserted into the electric circuit L4 of the N phase (fourth phase: neutral phase) to open the electric circuit L4 of the N phase from the conductive state. Switch to the blocked state.

Here, in the present embodiment, any one of the substrate B1, the leakage detection unit 3, and the drive unit 4 and the remaining two are separately arranged on both sides of the first opening / closing unit U1 in one direction. Will be done. Here, as an example, the drive unit 4 is arranged on one side (left side in FIG. 1) on both sides of the first opening / closing unit U1 in one direction, and the leakage detection unit 3 and the drive unit 4 are on the other side (right side in FIG. 1). ) Is placed. FIG. 1 is a schematic conceptual diagram for making it easier to understand the arrangement relationship in the earth leakage protection device 1, and the illustration of some components is appropriately omitted.

According to this configuration, any one of the substrate B1, the leakage detection unit 3, and the drive unit 4 and the remaining two are separately arranged on both sides of the first opening / closing unit U1 in one direction. To. Therefore, for example, the size can be reduced as compared with the earth leakage protection device described in Patent Document 1.

Particularly here, since the drive unit 4 is arranged in the body X1 of the opening / closing unit X0 corresponding to the N-phase electric circuit L4, further miniaturization can be achieved.

(2) Details Hereinafter, the overall configuration of the earth leakage protection device 1 according to the present embodiment will be described in detail with reference to FIGS. 1 to 10.

(2.1) Overall configuration In the following description, the direction along the X-axis is defined as the left-right direction and the positive direction of the X-axis is defined as the right side in FIG. Further, the direction along the Y-axis is defined as the front-back direction, and the positive direction of the Y-axis is defined as the front side. Further, the direction along the Z axis is defined as the vertical direction, and the positive direction of the Z axis is defined as the upper side. However, these directions are examples, and are not intended to limit the directions when the earth leakage protection device 1 is used. In addition, the arrows indicating each direction in the drawing are shown only for the sake of explanation, and are not accompanied by an entity.

As shown in FIGS. 2 and 3, the earth leakage protection device 1 has a substantially rectangular parallelepiped outer shell as a whole. As described above, the earth leakage protection device 1 is configured to be applicable to, for example, a three-phase four-wire system power supply system.

The earth leakage protection device 1 includes a first opening / closing unit U1, a second opening / closing unit U2, a control unit U3, and a load terminal unit U4 (see FIGS. 1 to 3). Further, the leakage protection device 1 further includes an interlocking link 9 (see FIG. 9), an interlocking handle 10, and a decorative cover 11.

(2.2) First opening / closing unit The first opening / closing unit U1 is composed of three opening / closing portions 2. The three opening / closing portions 2 are arranged side by side in one direction (left-right direction). As shown in FIG. 1, the three opening / closing portions 2 are paired with the first to third contact portions P1 to P3 inserted into the electric circuits L1 to L3 of the R phase, the S phase, and the T phase (in order from the left). Corresponding to one, by opening the corresponding contact portion P0, the electric circuit of the corresponding phase is switched from the conductive state to the cutoff state. Since the three opening / closing portions 2 have substantially the same configuration as each other, here, among the three opening / closing portions 2, the opening / closing portion 2 corresponding to the third contact portion P3 in the T-phase electric circuit L3 Only will be described mainly with reference to FIG. In FIG. 6, the control unit U3 and the like are removed.

The opening / closing portion 2 has a flat body 20 having a thickness direction in the left-right direction. The body 20 is formed of, for example, a synthetic resin material having electrical insulation. The body 20 is configured by assembling half-split cases that are divided in half in the left-right direction. FIG. 6 shows a T-phase opening / closing portion 2 in a state where the right half case is removed.

The opening / closing unit 2 further has a pair of screw terminals 21 (screwed terminals). Of the pair of screw terminals 21, the first screw terminal 211 (see FIG. 6) on the primary side (system power supply side) is arranged at the upper part in the body 20. That is, the first screw terminal 211 corresponds to the "power supply terminal 6" in this embodiment. In other words, the earth leakage protection device 1 includes a plurality of power supply terminals 6. The body 20 has a through hole 213 (see FIGS. 2 to 4) for exposing the head of the screw of the power supply terminal 6 to the outside. The body 20 has an insertion port 214 (see FIGS. 2 and 4) for inserting the electric wire W2 (see FIG. 11) on the system power supply side on the upper surface thereof. The “electric wire on the grid power supply side” is an electric wire that electrically connects the grid power supply and the earth leakage protection device 1. When the electric wire W2 is an insulated wire in which the core wire made of a conductor is covered with an insulating coating, only the tip end portion of the electric wire from which the insulating coating has been stripped, that is, the core wire can be inserted from the insertion port 214. The electric wire W2 may be either a single wire having a single core wire or a stranded wire having a plurality of core wires. With the electric wire W2 inserted from the insertion port 214, the electric wire W2 is connected to the power supply terminal 6 by inserting the tip of a tool such as a screwdriver through the through hole 213 and tightening the screw of the power supply terminal 6. In short, the three power supply terminals 6 of the three opening / closing portions 2 are provided corresponding to the R-phase, S-phase, and T-phase electric lines L1 to L3, respectively, and the electric wires W2 on the system power supply side are electrically connected.

The second screw terminal 212 on the secondary side of the pair of screw terminals 21 is arranged at the lower part in the body 20. The second screw terminal 212 is electrically connected to one of the four load terminals 5 of the load terminal unit U4, which will be described later, with the corresponding load terminal 5 via a connection line (any of the connection lines J1 to J4). To. The body 20 has a through hole 215 (see FIGS. 6 to 8) for exposing the head of the screw of the second screw terminal 212 to the outside.

The through holes 215 of each opening / closing portion 2 are covered with a decorative cover 11 (see FIG. 4). The decorative cover 11 is a resin molded product having a long rectangular plate shape in the left-right direction as a whole. The decorative cover 11 has a pair of hook-shaped hook pieces 111 provided near the lower end portion of the back surface thereof, and a protrusion 112 arranged between the pair of hook pieces 111. Further, the decorative cover 11 further has a pair of guide cylinders 113 protruding from the vicinity of both left and right ends on the back surface thereof. In the decorative cover 11, a pair of hook pieces 111 and protrusions 112 are hooked on a cover H3 (described later) of the load terminal unit U4, and a pair of guide cylinders 113 are inserted into two through holes 215 (N-phase and T-phase). It is held by fitting.

Further, as shown in FIG. 6, the opening / closing portion 2 further includes a contact portion P0, a link mechanism 12 (operation handle), a trip mechanism 13, an arc extinguishing device 14, and the like, which are housed in the body 20. , Or is held in the body 20.

The contact portion P0 is provided in an electric circuit connecting the pair of screw terminals 21. As shown in FIG. 6, the contact portion P0 has a fixed contact A1 and a movable contact A2 that contacts or separates from the fixed contact A1. The fixed contact A1 is fixed to, for example, the fixed contact plate 15. However, the fixed contact A1 may be integrated as a part of the fixed contact plate 15. The movable contact A2 is located at one end of the arm 16 (movable contact). The movable contact A2 is integrated as a part of the arm 16. However, the movable contact A2 is a separate member from the arm 16 and may be fixed to one end of the arm 16. The arm 16 is rotatable between a position where the movable contact A2 comes into contact with the fixed contact A1 and a position away from the fixed contact A1 with a shaft provided on the other end side as a fulcrum. The fixed contact plate 15 and the arm 16 form a part of an electric circuit connecting the pair of screw terminals 21.

As shown in FIG. 6, the link mechanism 12 has an operation handle 120 and a plurality of link members 121. The link mechanism 12 is configured to open or close the contact portion P0 in response to an opening operation (off operation) or a closing operation (on operation) of the operation handle 120. However, the interlocking handle 10 is configured so that all the contact portions P0 of the three opening / closing portions 2 and the one opening / closing portion X0 are interlocked to open or close the poles.

The operation handle 120 is rotatably supported by the body 20 in a state where a lever (operation knob) is projected to the outside of the body 20 from a window hole provided in the front wall of the body 20. A long interlocking handle 10 is engaged with the lever in the left-right direction. Each link member 121 connects the operation handle 120 and the arm 16, and interlocks the arm 16 with the rotational operation of the operation handle 120. The operation handle 120 is rotatable between an on position that closes the contact portion P0 and an off position that opens the contact portion P0. Further, the link member 121 interlocks the interlocking link 9 at the time of trip by the trip mechanism 13.

FIGS. 1 to 9 show the earth leakage protection device 1 in which the contact portion P0 is in the open pole state, and the lever of the operation handle 120 is in the state of being tilted downward.

When an overcurrent (short-circuit current and overload current) is detected, the trip mechanism 13 drives the link mechanism 12 described above to forcibly open (that is, trip) the contact portion P0. It is composed. As shown in FIGS. 5 and 6, the trip mechanism 13 has a coil 130, a yoke 131, a fixed iron core, a movable iron core 135, a pushing pin 134 (see FIG. 5), and a return spring. , These constitute an electromagnetic trip device. Further, the trip mechanism 13 has a bimetal plate 132, and the bimetal plate 132 constitutes a thermal tripping device. Here, the bimetal plate 132 corresponds to the "thermal element 8". In other words, each opening / closing unit 2 includes a thermal element 8. The thermal element 8 opens the corresponding contact portion P0 in response to the temperature rise.

First, the electromagnetic tripping device will be explained. The coil 130 is housed in the body 20 with its axial direction facing up and down. The first end of the coil 130 is electrically connected to the fixed contact plate 15 via a part of the yoke 131, and the second end of the coil 130 is electrically connected to the second screw terminal 212. That is, the coil 130 constitutes a part of the electric circuit connecting the pair of screw terminals 21.

The fixed iron core is made of a magnetic material and is housed in the coil bobbin 133. The movable core 135 is formed of a magnetic material and is slidably arranged in the coil bobbin 133 between a position in contact with the fixed core and a position away from the fixed core. The return spring is composed of, for example, a coil spring, and is housed between the movable iron core 135 and the fixed iron core in the coil bobbin 133. The return spring bends when the movable core 135 moves in a direction in contact with the fixed core, and generates an elastic force that moves the movable core 135 in a direction away from the fixed core. The pushing pin 134 is coupled to the movable iron core 135, and its tip protrudes to the outside of the coil bobbin 133. The pushing pin 134 is configured such that when the movable iron core 135 is sucked into the fixed iron core, its tip cooperates with a part of the link member 121. The yoke 131 is made of a magnetic material and is curved so as to cover the periphery of the coil 130.

When a short-circuit current flows through the coil 130 that forms part of the electric circuit, the movable iron core resists the spring force of the return spring so as to reduce the magnetic resistance of the magnetic path formed by the yoke 131, the movable iron core 135, and the like. 135 is displaced upward. In conjunction with this, the pushing pin 134 projects upward. At this time, the pushing force of the pushing pin 134 is transmitted to the arm 16 via the link mechanism 12, so that the arm 16 is driven so as to separate the movable contact A2 from the fixed contact A1. That is, the contact portion P0 is tripped. At the same time, the link mechanism 12 interlocks the interlocking link 9. By rotating the interlocking link 9 around the shaft 91, the contact portion P0 is tripped also in the other opening / closing portion 2 and the opening / closing portion X0. The lever of each operation handle 120 also rotates from the on position to the off position (shifts to a state of being tilted downward). When the short-circuit current is stopped, the spring force of the return spring causes the movable iron core 135 to be displaced downward, and the pushing pin 134 to return to its original position. After that, by manually moving the interlocking handle 10 that integrally connects the four operation handles 120 upward, all the contact portions P0 can be returned to the original closed pole state all at once.

Next, the thermal tripping device will be described. As the bimetal plate 132 (thermal element 8), a direct heat type that bends by self-heating or an indirect heat type that bends by heating with a heater can be used. The bimetal plate 132 (thermal element 8) is provided in an electric circuit connecting the pair of screw terminals 21. One end of the bimetal plate 132 is configured to cooperate with a part of the link member 121 when the bimetal plate 132 is curved. One end side of the bimetal plate 132 is electrically connected to the arm 16 via a lead wire such as a braided wire. The other end of the bimetal plate 132 is electrically connected to the power supply terminal 6 (first screw terminal 211) via the fixing plate 19 (see FIG. 9).

The bimetal plate 132 is deformed so that, for example, when an overcurrent due to an overload flows, the temperature of the bimetal plate 132 rises and one end of the bimetal plate 132 bends in a direction of being displaced upward. When one end of the bimetal plate 132 is deformed, the pushing force of the bimetal plate 132 is transmitted to the arm 16 via the link mechanism 12, so that the arm 16 is driven so as to separate the movable contact A2 from the fixed contact A1. That is, the contact portion P0 is tripped. At the same time, the link mechanism 12 interlocks the interlocking link 9. By rotating the interlocking link 9 around the shaft 91, the contact portion P0 is tripped also in the other opening / closing portion 2 and the opening / closing portion X0. The lever of each operation handle 120 also rotates from the on position to the off position (shifts to a state of being tilted downward). When the overcurrent due to the overload stops, the temperature of the bimetal plate 132 drops and returns to the original shape. After that, by manually moving the interlocking handle 10 upward, all the contact portions P0 can be returned to the original closed pole state all at once.

The arc extinguishing device 14 is configured to quickly extinguish the arc generated when the contact portion P0 is opened. As shown in FIG. 6, the arc extinguishing device 14 has an arc traveling plate 140 and an arc extinguishing grid 141. The arc traveling plate 140 is formed by bending a strip-shaped metal plate, and one end thereof is connected to the rear end of the bimetal plate 132. The arc extinguishing grid 141 has a plurality of arc extinguishing plates and a support portion. The plurality of arc-extinguishing plates are formed of a conductive material and are arranged in parallel at intervals along the front-rear direction. The support portion is formed of an electrically insulating material and supports a plurality of arc extinguishing plates. The arc extinguishing device 14 extends and divides the arc generated when the movable contact A2 is separated from the fixed contact A1 and extinguishes the arc. The back wall of the body 20 is provided with an exhaust port for discharging the gas generated by the above arc.

(2.3) Second opening / closing unit The second opening / closing unit U2 is composed of one opening / closing portion X0 as shown in FIG. The opening / closing portions X0 are arranged side by side along the arrangement direction (left-right direction) in which the three opening / closing portions 2 are arranged.

The opening / closing portion X0 corresponds to the fourth contact portion P4 inserted into the N-phase electric circuit L4, and by opening the fourth contact portion P4, the corresponding N-phase electric circuit L4 is switched from the conductive state to the cutoff state.

Hereinafter, the opening / closing portion X0 will be described mainly with reference to FIG. However, with respect to the components substantially common to the three opening / closing portions 2, the same reference numerals may be given and the description thereof may be omitted as appropriate. In FIG. 8, the control unit U3 and the like are removed as in FIG.

The opening / closing portion X0 has a flat body X1 having a thickness direction in the left-right direction. The body X1 is formed of, for example, a synthetic resin material having electrical insulation. The body X1 is arranged on one side (left side) of both sides of the first opening / closing unit U1 in one direction (left-right direction), and covers a part of the N-phase (neutral phase) electric circuit L4. In other words, here, the opening / closing portion X0 is arranged on the left side of the opening / closing portion 2 of the R phase. The body X1 is configured by assembling half-split cases that are divided in half in the left-right direction. FIG. 8 shows the opening / closing portion X0 with the left half case removed. Here, the outer shell of the body X1 has substantially the same shape and the same dimensions as the body 20 of each opening / closing portion 2. Therefore, as shown in FIG. 1, the opening / closing portion X0 and the three opening / closing portions 2 having the same width dimension (dimension in the left-right direction) are arranged adjacent to each other in a horizontal row, so that the leakage protection device 1 has a sense of unity. Is provided.

The opening / closing portion X0 includes a pair of screw terminals 21 (threaded terminals), that is, a first screw terminal 211 on the primary side (system power supply side) and a second screw terminal 212 on the secondary side, similarly to each opening / closing portion 2. ,have. The first screw terminal 211 corresponds to the power supply terminal 6. The body X1 has a through hole 213 for exposing the head of the screw of the power supply terminal 6 to the outside. The body X1 has an insertion port 214 on the upper surface thereof for inserting the electric wire W2 on the system power supply side. The second screw terminal 212 is electrically connected to the corresponding load terminal 5 of the four load terminals 5 of the load terminal unit U4 via a connection line (any of the connection lines J1 to J4). The body X1 has a through hole 215 for exposing the head of the screw of the second screw terminal 212 to the outside. The through hole 215 of the opening / closing portion X0 is covered with the decorative cover 11.

Further, as shown in FIG. 8, the opening / closing portion X0 further includes a contact portion P0 (fourth contact portion P4), a link mechanism X2 (operation handle), a trip mechanism X3, and the like, and these are inside the body X1. It is housed in or held in the body X1. The opening / closing unit X0 is not provided with an arc extinguishing device.

The fourth contact portion P4 is provided in an electric circuit connecting the pair of screw terminals 21. The fourth contact portion P4 has a fixed contact A1 and a movable contact A2, similarly to the contact portion P0 of each opening / closing portion 2. The fixed contact A1 is fixed to the fixed contact plate 15, and the movable contact A2 is at one end of the arm 16. The fixed contact plate 15 is electrically connected to the second screw terminal 212 via a lead wire such as a braided wire.

As shown in FIG. 8, the link mechanism X2 has an operation handle 120 and a plurality of link members X21 such as torsion springs. The link mechanism X2 is configured to open or close the fourth contact portion P4 in response to an opening operation (off operation) or closing operation (on operation) of the operation handle 120. The operation handle 120 is rotatably supported by the body X1 in a state where the lever is projected to the outside of the body X1 through a window hole provided in the front wall of the body X1. Each link member X21 connects the operation handle 120 and the arm 16, and interlocks the arm 16 with the rotational operation of the operation handle 120. The operation handle 120 is rotatable between an on position for closing the fourth contact portion P4 and an off position for opening the fourth contact portion P4. Further, the link member X21 interlocks the interlocking link 9 at the time of trip by the trip mechanism X3.

When a leakage current (leakage) is detected, the trip mechanism X3 is configured to drive the link mechanism X2 described above to forcibly open (that is, trip) the fourth contact portion P4. .. That is, the trip mechanism X3 corresponds to the "drive unit 4" in the present embodiment. In other words, the drive unit 4 is configured to operate according to the earth leakage detection result in the earth leakage detection unit 3 and open the first contact portion P1 to the third contact portion P3. However, here, the drive unit 4 is configured to open the fourth contact unit P4 as well.

As shown in FIG. 8, the trip mechanism X3 has an earth leakage trip coil X31, a coil bobbin X32, a trip pin, a movable plunger X33, and the like, and these constitute an electromagnetic trip device. The trip mechanism X3 does not have a bimetal plate (thermal element), unlike the trip mechanism 13 of each opening / closing unit 2. In the opening / closing portion X0, the arm 16 is electrically connected to the power supply terminal 6 via a lead wire such as a braided wire.

The earth leakage trip coil X31 is housed in the body X1 with its axial direction facing up and down. Both ends of the earth leakage trip coil X31 are electrically connected to the control unit C1 of the control unit U3 (described later). The trip pin and the movable plunger X33 are housed in the earth leakage trip coil X31. The movable plunger X33 is made of a magnetic material and is coupled to a trip pin. The tip of the trip pin projects to the outside of the earth leakage trip coil X31 and faces a part of the link member X21.

When the leakage current is detected by the leakage detection unit 3 of the control unit U3, the control unit C1 of the control unit U3 causes a drive current to flow through the leakage trip coil X31. As a result, the movable plunger X33 is displaced upward so as to push up the trip pin by the magnetic force formed in the earth leakage trip coil X31. At this time, the pushing force of the trip pin is transmitted to the arm 16 via the link mechanism X2, so that the arm 16 is driven so as to separate the movable contact A2 from the fixed contact A1. That is, the fourth contact portion P4 is tripped. At the same time, the link mechanism X2 interlocks the interlocking link 9. By rotating the interlocking link 9 around the shaft 91, the contact portion P0 is tripped even in the three opening / closing portions 2. The lever of each operation handle 120 also rotates from the on position to the off position (shifts to a state of being tilted downward). When the leakage current stops, the control unit C1 of the control unit U3 stops the drive current, so that the trip pin and the movable plunger X33 return to their original positions due to their own weight. After that, by manually moving the interlocking handle 10 that integrally connects these operation handles 120 upward, all the contact portions P0 including the fourth contact portion P4 are simultaneously returned to the original closed pole state. Can be done.

By the way, the earth leakage protection device 1 has a test function. Specifically, as shown in FIG. 8, the opening / closing unit X0 further includes a pseudo electric leakage generating unit X4. The pseudo-leakage generation unit X4 has a test button X41 (operation unit) and a contact unit X42 that is closed by pressing the test button X41. The contact portion X42 is always open. A part of the test button X41 protrudes from a window hole formed in the front wall of the body X1, and is held retractably by the body X1. The contact portion X42 includes a torsion spring X43, a pair of conductor pins X44 and the like that form a part of a pseudo-leakage electric circuit through which a pseudo-leakage current passes. The pseudo-leakage electric circuit is electrically connected to the control unit C1. The wiring forming a part of the pseudo electric leakage circuit passes through the hole of the zero-phase current transformer 30. One end of the torsion spring X43 is in constant contact with one of the pair of conductor pins X44. By pressing the test button X41, the test button X41 pushes down the other end of the torsion spring X43, and the torsion spring X43 comes into contact with the other of the pair of conductor pins X44. As a result, the contact portion X42 is closed, and a pseudo leakage current flows through the pseudo leakage electric circuit. The control unit C1 determines that an earth leakage has occurred, and causes a drive current to flow through the earth leakage trip coil 31. In short, by pressing the test button X41, the leakage protection device 1 can be made to perform the same operation as when the leakage occurs.

(2.4) Control unit As shown in FIGS. 1 and 5, the control unit U3 has a substrate B1, a control unit C1, an earth leakage detection unit 3, an instrument G1, a holder 17, and the like.

As a whole, the body G1 has a flat rectangular box shape having a thickness direction in the left-right direction. The body G1 is formed of, for example, a synthetic resin material having electrical insulation. The body G1 has a base G2 and a cover G3. The body G1 is configured by assembling a rectangular box-shaped cover G3 with an open left side to a rectangular box-shaped base G2 with an open right side. The body G1 internally houses a substrate B1, a control unit C1, an earth leakage detection unit 3, and the like. The body G1 is arranged on the right side of the first opening / closing unit U1. In other words, here, the control unit U3 is arranged on the right side of the opening / closing portion 2 of the T phase.

The outer shell of the body G1 has substantially the same dimensions (width) in the left-right direction and the size in the front-rear direction as the body 20 of each opening / closing part 2 and the body X1 of the opening / closing part X0. Therefore, as shown in FIGS. 2 and 3, the body X1, the three body 20, and the body G1 are arranged adjacent to each other in a horizontal row to provide the earth leakage protection device 1 having a sense of unity. Will be done.

The board B1 is, for example, one printed wiring board. However, the number of substrates B1 is not particularly limited. A pattern wiring of a conductor is formed on the substrate B1. As shown in FIG. 1, a plurality of electronic components E1 (may be one) are mounted on the substrate B1. The plurality of electronic components E1 may be mounted on two or more substrates B1 in a distributed manner.

The substrate B1 is arranged so that its thickness direction is along the left-right direction. The substrate B1 is positioned by a support column G5 (see FIG. 7) or the like that projects to the right from the inner surface of the base G2. In FIG. 7, the cover G3 is removed.

The substrate B1 is held at a position closer to the right wall of the body G1 than the center in the left-right direction (see FIGS. 1 and 5). The plurality of electronic components E1 mounted on the substrate B1 include control electronic components E10 constituting the control unit C1, electronic components constituting the power supply circuit, and the like. Here, the control electronic component E10 is an IC chip.

The control electronic component E10 is mounted on the second surface B12 (right surface) opposite to the first surface B11 of the substrate B1. That is, the main body of the control electronic component E10 is arranged on the second surface B12. The first surface B11 is a surface (left surface) facing the first opening / closing unit U1 (via the wall of the body G1). The other electronic components E1 are distributedly mounted on the first surface B11 or the second surface B12. Among the other electronic components E1, the tall component may be mounted on the first surface B11. Examples of tall components include terminal blocks, capacitors, and surge absorbing elements (ZNR: Zinc oxide Nonlinear Resistor) that protect circuits from lightning surges and the like.

The leakage detection unit 3 is a sensor that detects leakage related to the multi-phase electric circuits L1 to L3. The leakage detection unit 3 detects the leakage current as a physical quantity. As described above, the earth leakage detection unit 3 includes the zero-phase current transformer 30. The zero-phase current transformer 30 is formed in an annular shape as a whole and has an axial direction. The output line of the zero-phase current transformer 30 is electrically connected to the control unit C1. The four connection lines J1 to J4 and the wiring forming a part of the above-mentioned pseudo electric leakage electric circuit are passed through the holes of the zero-phase current transformer 30. The zero-phase current transformer 30 is housed in the lower part of the body G1 so that the axial direction is along the left-right direction. However, the zero-phase current transformer 30 is arranged so that its left side surface is exposed from the body G1. In other words, the body G1 has an opening G4 (see FIG. 5) on its left side for exposing a part of the zero-phase current transformer 30. The holder 17 is, for example, a molded product made of resin, and is fixed to the cover G3. The holder 17 stably holds the zero-phase current transformer 30 in the body G1.

The control unit C1 includes, for example, a computer system. A computer system mainly comprises one or more processors and one or more memories as hardware. The function of the control unit C1 is realized when one or more processors execute a program recorded in one or more memories of the computer system. The program is pre-recorded in one or more memories of the computer system. The program may be provided through a telecommunication line, or may be recorded and provided on a non-temporary recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by a computer system. Further, the control unit C1 is not limited to the configuration by a digital IC such as a processor, and may be configured by an analog IC.

The control unit C1 is configured to control the drive unit 4 (trip mechanism X3). Specifically, when the control unit C1 detects an earth leakage current via the zero-phase current transformer 30, it causes a drive current to flow through the earth leakage trip coil X31 in the opening / closing part X0 to cause the fourth contact part P4. The four contact portions P0 including the one are forcibly opened.

The control unit C1 receives the operating power supply from the system power supply via the power supply circuit on the board B1. Specifically, the power supply circuit converts the AC power supply received from the system power supply into a DC voltage having a predetermined voltage value and supplies it to the control unit C1.

Here, when the leakage protection device 1 is in use and no leakage has occurred, the magnetic flux generated by the reciprocating current with respect to the load of the electric device or the like is canceled out, and the control unit C1 is transmitted from the output line of the zero-phase current transformer 30. The output to is zero. On the other hand, when an electric leakage occurs, the current flowing through the two electric circuits (any two of the four connection lines J1 to J4) becomes unbalanced, and the output line of the zero-phase current transformer 30 depends on the degree of unbalance. Current flows. Therefore, the control unit C1 can detect whether or not an electric leakage (leakage current) has occurred based on the output of the zero-phase current transformer 30. When the control unit C1 detects an electric leakage, it generates a driving current (exciting current) and causes the electric leakage trip coil X31 to perform a trip operation by the driving unit 4 (trip mechanism X3). Even when the test button X41 is pressed, a current corresponding to the degree of unbalance flows through the output line of the zero-phase current transformer 30, so that the control unit C1 similarly causes the drive unit 4 to perform a trip operation. ..

(2.5) Load Terminal Unit As shown in FIGS. 4 to 8, the load terminal unit U4 has a plurality of load terminals 5 (here, four), a holding member 18, and a body H1. ing.

The four load terminals 5 are provided corresponding to the N-phase, R-phase, S-phase, and T-phase electric lines L1 to L4, respectively, and the electric wire W1 on the load side (see FIG. 11) is connected. Each load terminal 5 is a screw terminal (screwed terminal). Three of the four load terminals 5 are one side (lower) of the first opening / closing unit U1 in the orthogonal direction orthogonal to one direction (horizontal direction) when the first opening / closing unit U1 is viewed from the front. The remaining one load terminal 5 is arranged on the side) and is arranged on the lower side of the second opening / closing unit U2.

The four load terminals 5 are electrically connected to the four second screw terminals 212 one-on-one via the four connection lines J1 to J4. The connection lines J1 to J3 are connected to the second screw terminal 212 of the opening / closing portion 2 of the R phase, the S phase, and the T phase, respectively. The connection line J4 is connected to the second screw terminal 212 of the N-phase opening / closing portion 2.

As a whole, the body H1 has a rectangular box shape that is long in the left-right direction. The body H1 is formed of, for example, a synthetic resin material having electrical insulation. The body H1 has a case H2 and a cover H3. Note that in FIGS. 6 to 8, the case H2 and the cover H3 are not shown.

The front surface of the case H2 is open, and the case H2 has an accommodating portion for accommodating each load terminal 5 individually. The cover H3 is assembled to the case H2 so as to cover the open front surface of the case H2. The cover H3 has four window holes H30 for exposing the heads of the screws of the four load terminals 5. The case H2 has an insertion port H20 (see FIG. 3) on the lower surface thereof for inserting the electric wire W1 on the load side. The “load-side electric wire” is an electric wire that electrically connects the load and the earth leakage protection device 1. When the electric wire W1 is an insulated wire in which the core wire made of a conductor is covered with an insulating coating, only the tip end portion of the electric wire from which the insulating coating has been stripped, that is, the core wire can be inserted from the insertion port H20. The electric wire W1 may be either a single wire whose core wire is a single conductor or a stranded wire whose core wire is a plurality of conductor wires. With the electric wire W1 inserted from the insertion port H20, the electric wire W1 is connected to the load terminal 5 by inserting the tip of a tool such as a screwdriver through the window hole H30 and tightening the screw of the load terminal 5. In short, the four load terminals 5 are provided corresponding to the R-phase, S-phase, T-phase, and N-phase electric lines L1 to L4, respectively, and the electric wire W1 on the load side can be electrically connected.

Further, the cover H3 has three locking holes H31 (see FIG. 4) on the front surface thereof. With the pair of hook pieces 111 and protrusions 112 of the decorative cover 11 hooked on the three locking holes H31, the pair of guide cylinders 113 of the decorative cover 11 are inserted into the two through holes 215 (N-phase and T-phase). By fitting, the decorative cover 11 is held. In this state, the decorative cover 11 covers the four through holes 215.

As shown in FIGS. 5 to 8 and 10, the holding member 18 is a member configured to hold the four connecting lines J1 to J4. The holding member 18 is, for example, a resin molded product. The holding member 18 has a substantially rectangular box shape that is long and flat in the left-right direction. The upper surface of the holding member 18 is open. The holding member 18 is housed in the body H1 so that its thickness direction is along the vertical direction. The holding member 18 is arranged so as to be interposed between the four load terminals 5 and the four second screw terminals 212.

As shown in FIG. 10, the holding member 18 has accommodating recesses 181 to 184 for individually accommodating the four connecting lines J1 to J4. The accommodating recesses 181 to 184 are recessed in a direction away from the second screw terminal 212. FIG. 10 is a top view of a cross section of the earth leakage protection device 1 cut along a horizontal plane slightly above the holding member 18.

One end of the connection line J1 is connected to the second screw terminal 212 of the R-phase opening / closing portion 2, and is housed in the housing recess 181 to the right (X-axis) toward the zero-phase current transformer 30. Extends in the positive direction). Then, after passing through the hole of the zero-phase current transformer 30, the connecting line J1 is bent downward and extends to the left (negative direction of the X-axis) again along the groove 185 at the lower part of the holding member 18. .. The other end J11 of the connection line J1 is connected to the load terminal 5 directly below the second screw terminal 212 of the R phase. Specifically, the holding member 18 has a recess 186 for leading the tip of the terminal plate 51 of the load terminal 5 to the upper side of the holding member 18. The other end J11 of the connection line J1 is connected to the tip of the terminal plate 51 led out from the recess 186.

One end of the connection line J2 is connected to the second screw terminal 212 of the S-phase opening / closing portion 2, and is housed in the housing recess 182, and is housed in the housing recess 182 to the right (X-axis) toward the zero-phase current transformer 30. Extends in the positive direction). Then, after passing through the hole of the zero-phase current transformer 30, the connecting line J2 is bent upward and extends to the left (negative direction of the X-axis) again along the slit 187 at the upper part of the holding member 18. .. The other end J21 of the connection line J2 is connected to the terminal plate 51 (see FIG. 6) of the load terminal 5 directly below the second screw terminal 212 of the S phase.

One end of the connection line J3 is connected to the second screw terminal 212 of the T-phase opening / closing portion 2, and is accommodated in the accommodating recess 183 to the right (X-axis) toward the zero-phase current transformer 30. Extends in the positive direction). Then, after passing through the hole of the zero-phase current transformer 30, the connecting line J3 is bent downward and extends to the left (in the negative direction of the X-axis) again along the slit 188 at the lower part of the holding member 18. .. The other end J31 of the connection line J3 is connected to the terminal plate 51 (see FIG. 6) of the load terminal 5 directly below the T-phase second screw terminal 212.

One end of the connection line J4 is connected to the second screw terminal 212 of the N-phase opening / closing portion X0, and is housed in the housing recess 184, and is housed to the right (X-axis) toward the zero-phase current transformer 30. Extends in the positive direction). Then, after passing through the hole of the zero-phase current transformer 30, the connecting line J4 is bent upward and extends to the left (negative direction of the X-axis) again along the groove 189 at the upper part of the holding member 18. .. The other end J41 of the connection line J4 is connected to the load terminal 5 directly below the N-phase second screw terminal 212. Specifically, the holding member 18 has a recess 190 for leading the tip of the terminal plate 51 of the load terminal 5 to the upper side of the holding member 18. The other end J41 of the connection line J4 is connected to the tip of the terminal plate 51 led out from the recess 190.

In short, the four connection lines J1 to J4 not only electrically connect the four load terminals 5 and the four second screw terminals 212, but also the zero-phase current transformer arranged in the control unit U3 on the way. It is necessary to pass through the hole of the vessel 30. Therefore, the four connecting lines J1 to J4 are routed so as to bypass. The holding member 18 is structured so as to stably hold the four connecting lines J1 to J4 in a routed state.

In particular, in the holding member 18, the positional relationship between the accommodating recesses 181 to 184 and the like is arranged so that the four connecting lines J1 to J4 pass through the four corners in the holes of the zero-phase current transformer 30 (see FIGS. 6 and 7). It is stipulated. Therefore, it is possible to reduce the possibility that the four connecting lines J1 to J4 interfere with each other even though they are routed so as to bypass them.

Case H2 has, for example, a plurality of locking pieces on the back wall. The load terminal unit U4 is fixed to the first opening / closing unit U1 by hooking a plurality of locking pieces into the locking grooves formed on the back wall of the first opening / closing unit U1. Further, the case H2 and the cover H3 have insertion pieces H21 and H32 at their right ends, respectively (see FIG. 4). The body 20 of each opening / closing part 2, the body X1 of the opening / closing part X0, and the body G1 of the control unit U3 have through holes through which the two rivets K1 are inserted. Further, the body 20 of each opening / closing part 2 and the body X1 of the opening / closing part X0 have through holes through which the four rivets K2 are inserted.

For example, by inserting four rivets K2 into the through holes of the three body 20 and the body X1 and crimping the tip, the three opening / closing part 2 and one opening / closing part X0 are integrally assembled. Further, for example, in a state where the insertion pieces H21 and H32 of the load terminal unit U4 are inserted inside the cover G3 of the control unit U3, two rivets K1 are passed through the through holes of the three units U1 to U3, and the tip is passed through the through holes. By caulking, these units U1 to U4 are assembled.

(2.6) Interlocking link The interlocking link 9 (see FIG. 9) is mechanically connected to the three opening / closing portions 2 and connects the first contact portion P1 to the third contact portion P3 according to the operation of the drive unit 4. Open the poles in conjunction with each other. Here, the interlocking link 9 is further mechanically connected to the opening / closing portion X0, and the four contact portions P0 are interlocked with each other to open the pole.

As shown in FIG. 9, the interlocking link 9 is composed of four resin block bodies 90 and four shafts 91. For convenience of explanation, FIG. 9 shows only the interlocking link 9 and its peripheral portion in the earth leakage protection device 1.

Each block body 90 is a member curved in a substantially arc shape when viewed along the left-right direction. Each of the body 20 of the three opening / closing parts 2 and the body X1 of one opening / closing part X0 accommodates one block body 90. The four shafts 91 are arranged in the left-right direction so that their respective axes coincide with each other. Each shaft 91 penetrates through an insertion hole provided in two adjacent bodies. Two adjacent block bodies 90 are connected by a shaft 91.

Then, the four block bodies 90 rotate integrally within a predetermined angle range with the shaft 91 as the central axis in the body 20 of the three opening / closing parts 2 and the body X1 of the one opening / closing part X0. It is held possible.

The block body 90 in each body 20 is rotated by the link member 121 of the link mechanism 12 at the time of trip by the trip mechanism 13. Further, the block body 90 in the body X1 is rotated within a predetermined angle about the shaft 91 by the link member X21 of the link mechanism X2 at the time of trip by the trip mechanism X3.

In short, no matter which of the three opening / closing parts 2 and the one opening / closing part X0 starts the trip operation, the interlocking link 9 rotates so that the other three opening / closing parts are also interlocked and immediately tripped. Is executed. Therefore, a plurality of contact portions P0 can be opened substantially at the same time, and the reliability regarding circuit protection is improved.

(2.7) Arrangement structure Here, the arrangement structure in the earth leakage protection device 1 will be described. In the earth leakage protection device 1, as shown in FIG. 1, the drive unit 4, the substrate B1 and the earth leakage detection unit 3 are separately arranged on both sides of the first opening / closing unit U1 in the left-right direction. Therefore, for example, a space for routing the wiring related to the drive unit 4, the substrate B1 and the leakage detection unit 3 can be easily secured between both sides of the first opening / closing unit U1. Therefore, for example, the size can be reduced as compared with the earth leakage protection device described in Patent Document 1.

Here, the N-phase (neutral phase) switching unit X0 is provided with a trip mechanism 13 (bimetal plate 132, coil 130, etc.) for overcurrent (short-circuit current and overload current), unlike the three switching units 2. Not. Therefore, in the present embodiment, the drive unit 4 is arranged in the body X1 by securing a space for arranging the drive unit 4 in the body X1 of the opening / closing unit X0. Therefore, the width dimension of the four-phase body of the R-phase, S-phase, T-phase, and N-phase in the earth leakage protection device 1 is, for example, that of the four-phase body of the earth leakage protection device described in Patent Document 1. When it is substantially the same as the width dimension, the size of the leakage protection device 1 as a whole can be reduced.

Further, the substrate B1 and the leakage detection unit 3 are arranged on the same one side (right side) of both sides of the first opening / closing unit U1 in the left-right direction. Therefore, the wiring distance between the substrate B1 and the leakage detection unit 3 can be shortened while reducing the size.

Further, since the four load terminals 5 are arranged below the first opening / closing unit U1 when the first opening / closing unit U1 is viewed from the front, the size is further reduced as compared with, for example, the earth leakage protection device described in Patent Document 1. Can be planned.

In particular, each of the four load terminals 5 and the corresponding power supply terminal 6 are arranged in the vertical direction (see FIGS. 2 and 3). Therefore, it is possible to improve the appearance while further reducing the size. Further, since the correspondence between the load terminal 5 and the power supply terminal 6 is easy to understand, workability such as wiring work is improved.

(2.8) Heat buffering unit By the way, regarding the first opening / closing unit U1, the contact portion P0 and the electric circuit (thermal element 8 or the like) around it can be a heat generating source. Therefore, as shown in FIG. 1, the earth leakage protection device 1 of the present embodiment further includes a pair of heat buffer portions 7. The pair of heat buffer portions 7 are arranged on both sides of the first opening / closing unit U1 in the left-right direction.

Each heat buffer 7 is composed of a space SP1 surrounded by a peripheral wall Q1. Regarding the heat buffer portion 7 (space SP1) on the left side, the peripheral wall Q1 corresponds to the peripheral wall of the body X1 of the opening / closing portion X0. That is, the heat buffer portion 7 on the left side is a space surrounded by the body X1. Regarding the heat buffer portion 7 (space SP1) on the right side, the peripheral wall Q1 corresponds to the peripheral wall of the body G1 of the control unit U3. That is, the heat buffer portion 7 on the right side is a space surrounded by the body G1.

By arranging the heat buffer portions 7 on both sides of the first opening / closing unit U1 in this way, it is possible to suppress the conduction of heat from the heat generation source to the side. Therefore, it is possible to reduce the temperature rise on both the left and right sides of the earth leakage protection device 1 as a whole while reducing the size. Further, since the heat buffer portion 7 is composed of the space SP1, the temperature rise can be reduced while having a simple structure.

In particular, the N-phase opening / closing part X0 and the control unit U3, which have substantially the same width dimension in the left-right direction as each opening / closing part 2, are arranged so as to sandwich the left and right sides of the first opening / closing unit U1, so that the appearance looks good. It is possible to reduce the temperature rise on both the left and right sides of the leakage protection device 1 while improving the above.

Further, the earth leakage protection device 1 of the present embodiment further includes a pair of partition walls F1 as shown in FIG. Each partition wall F1 is arranged between the heat buffer portion 7 and the opening / closing portion 2 adjacent to the heat buffer portion 7. However, here, the partition wall F1 on the left side is composed of the right wall of the body X1 of the N-phase opening / closing part X0 and the left wall of the body 20 of the R-phase opening / closing part 2. The right partition wall F1 is composed of the right wall of the body 20 of the T-phase opening / closing part 2 and the left wall of the body G1 of the control unit U3.

By providing the partition wall F1 in this way, it is possible to further reduce the temperature rise on both the left and right sides of the earth leakage protection device 1.

Further, as shown in FIG. 1, the three thermal elements 8 (bimetal plate 132) of the three opening / closing portions 2 are arranged at a predetermined pitch interval D1 in the left-right direction. The pitch interval D1 corresponds to, for example, the interphase distance between the R phase and the S phase (or the correlation distance between the S phase and the T phase). And here, the dimension D2 of the heat buffer portion 7 in the left-right direction is equal to the pitch interval D1. The term "equal" here corresponds to "equal" to the extent that it can be judged to be substantially equal to the naked eye, and also corresponds to a case where it is slightly smaller or larger, for example, about several millimeters.

By defining the dimensional relationship in this way, it is possible to further reduce the temperature rise on both the left and right sides of the earth leakage protection device 1 while improving the appearance. It can also be easily performed when the opening / closing unit 2 is added.

By the way, as described above, the control electronic component E10 is mounted on the second surface B12 (right surface) opposite to the first surface B11 of the substrate B1. Therefore, the control electronic component E10 is less susceptible to the heat from the heat generating source of the first opening / closing unit U1 than when it is mounted on the first surface B11. Therefore, it is possible to reduce the temperature rise in the control electronic component E10 while reducing the size.

(2.9) Distribution Board As shown in FIG. 11, the distribution board 100 of the present embodiment includes the above-mentioned earth leakage protection device 1 and a housing 101 for accommodating the earth leakage protection device 1. Further, the distribution board 100 further includes an earth leakage protection device 1 and one or a plurality of DIN rails 102 (only one in FIG. 11) to which a plurality of circuit breakers for branch circuits are fixed. In the present embodiment, it is possible to provide a distribution board 100 provided with an earth leakage protection device 1 capable of miniaturization.

(3) Modified Example The above embodiment is only one of various embodiments of the present disclosure. The above-described embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Hereinafter, modifications of the above embodiment will be listed. The modifications described below can be applied in combination as appropriate. Hereinafter, the above embodiment may be referred to as a “basic example”.

In the basic example, the number of opening / closing portions 2 is three according to the electric circuits of R phase, S phase, and T phase, but the number of opening / closing portions 2 is not particularly limited.

In the basic example, of the substrate B1, the leakage detection unit 3, and the drive unit 4, the drive unit 4 and the substrate B1 and the leakage detection unit 3 are separately arranged on both sides of the first opening / closing unit U1 in the left-right direction. Will be done. However, it is not limited to this combination. However, it is desirable that at least the leakage detection unit 3 and the drive unit 4 are separately arranged on both sides of the first opening / closing unit U1. Then, it is desirable that the drive unit 4 is housed inside the body X1 of the opening / closing unit X0. In this case, by separately arranging the earth leakage detection unit 3 and the drive unit 4, which are likely to have relatively large dimensions, the widths of the body X1 and the control unit U3 arranged on both sides of the first opening / closing unit U1. It becomes easier to align the dimensions. Therefore, it is possible to provide an arrangement structure having a good appearance when viewed as the earth leakage protection device 1 as a whole.

In the basic example, the heat buffer portions 7 are arranged on both sides of the first opening / closing unit U1 in the left-right direction. However, the heat buffer 7 may be arranged on only one of both sides of the first opening / closing unit U1.

In the basic example, the heat buffer portion 7 is composed of the space SP1 surrounded by the peripheral wall Q1. However, the heat buffer portion 7 may be composed of, for example, a heat buffer member such as a heat insulating material.

In the basic example, the dimension D2 of the heat buffer portion 7 is equal to the pitch interval D1 of the three thermal elements 8 (bimetal plate 132). However, the dimension D2 of the heat buffer portion 7 may be larger than the pitch interval D1, and in this case, the temperature rise on both the left and right side surfaces of the earth leakage protection device 1 can be further reduced. In particular, since the dimension D2 of the heat buffer portion 7 is an integral multiple of the pitch interval D1, the temperature rise can be further reduced while improving the appearance.

(4) Summary As described above, the earth leakage protection device (1) according to the first aspect includes a plurality of opening / closing parts (2), a substrate (B1), an earth leakage detection part (3), and a drive part ( 4) and. The plurality of opening / closing portions (2) have a one-to-one correspondence with a plurality of contact portions (P1 to P3) inserted into a plurality of phase electric circuits (L1 to L3), and correspond by opening the corresponding contact portions. The electric circuit of the phase to be used is switched from the conductive state to the cutoff state. One or more electronic components (E1) are mounted on the substrate (B1). The leakage detection unit (3) detects a leakage related to the multi-phase electric circuits (L1 to L3). The drive unit (4) operates according to the detection result of the electric leakage in the electric leakage detection unit (3), and opens a plurality of contact parts (P1 to P3). The plurality of opening / closing portions (2) are arranged side by side in one direction to form an opening / closing unit (first opening / closing unit U1). One of the substrate (B1), the leakage detection unit (3), and the drive unit (4) and the remaining two are separated on both sides of the opening / closing unit (first opening / closing unit U1) in one direction. Is placed. According to the first aspect, miniaturization can be achieved.

The earth leakage protection device (1) according to the second aspect further includes a plurality of load terminals (5) in the first aspect. The plurality of load terminals (5) are provided corresponding to the plurality of phase electric lines (L1 to L3), and the electric wires (W1) on the load side are connected. The plurality of load terminals (5) are arranged on one side of the opening / closing unit in the orthogonal direction orthogonal to one direction when the opening / closing unit (first opening / closing unit U1) is viewed from the front. According to the second aspect, further miniaturization can be achieved.

The earth leakage protection device (1) according to the third aspect further includes a plurality of power supply terminals (6) in the second aspect. The plurality of power supply terminals (6) are provided corresponding to the plurality of phase electric lines (L1 to L3), and the electric wires (W2) on the system power supply side are electrically connected. Each of the plurality of load terminals (5) and the corresponding power supply terminal (6) are arranged in the orthogonal direction. According to the third aspect, the appearance is improved while further reducing the size.

The earth leakage protection device (1) according to the fourth aspect further includes an instrument (X1) in any one of the first to third aspects. The body (X1) is arranged on one side of both sides of the opening / closing unit (first opening / closing unit U1) in one direction and covers a part of the neutral phase electric circuit (L4). Of the substrate (B1), the earth leakage detection unit (3), and the drive unit (4), at least the earth leakage detection unit (3) and the drive unit (4) are arranged separately on both sides of the opening / closing unit in one direction. Will be done. The drive unit (4) is housed inside the body (X1). According to the fourth aspect, when the earth leakage protection device (1) as a whole is viewed by separately arranging the earth leakage detection unit (3) and the drive unit (4), which are likely to have relatively large dimensions. In addition, it is possible to provide an arrangement structure that looks good in appearance.

The earth leakage protection device (1) according to the fifth aspect further includes a heat buffer (7) in any one of the first to fourth aspects. The heat buffer (7) is arranged on at least one of both sides of the opening / closing unit (first opening / closing unit U1) in one direction. According to the fifth aspect, it is possible to reduce the temperature rise on one side of the leakage protection device (1) as a whole while reducing the size.

Regarding the earth leakage protection device (1) according to the sixth aspect, in the fifth aspect, the heat buffer portion (7) is composed of a space (SP1) surrounded by a peripheral wall (Q1). According to the sixth aspect, it is possible to reduce the temperature rise on one side of the above while having a simple structure.

The earth leakage protection device (1) according to the seventh aspect further includes a partition wall (F1) in the fifth or sixth aspect. The partition wall (F1) is arranged between the heat buffering portion (7) and the opening / closing portion (2) adjacent to the heat buffering portion (7) among the plurality of opening / closing portions (2). According to the seventh aspect, the partition wall (F1) can further reduce the temperature rise on one side.

Regarding the earth leakage protection device (1) according to the eighth aspect, in any one of the fifth to seventh aspects, each of the plurality of opening / closing portions (2) opens the corresponding contact portion in response to the temperature rise. It has an extreme thermal element (8). The plurality of thermal elements (8) of the plurality of opening / closing portions (2) are arranged at predetermined pitch intervals (D1) in one direction. The dimension (D2) of the heat buffer (7) in one direction is equal to or greater than the pitch interval (D1). According to the eighth aspect, the temperature rise on one side of the above can be further reduced.

Regarding the earth leakage protection device (1) according to the ninth aspect, in any one of the first to eighth aspects, the substrate among the substrate (B1), the earth leakage detection unit (3), and the drive unit (4). (B1) and the leakage detection unit (3) are as follows. That is, the substrate (B1) and the leakage detection unit (3) are arranged on the same one side of both sides of the opening / closing unit (first opening / closing unit U1) in one direction. According to the ninth aspect, the wiring distance between the substrate (B1) and the leakage detection unit (3) can be shortened while reducing the size.

Regarding the earth leakage protection device (1) according to the tenth aspect, in any one of the first to ninth aspects, one or more electronic components (E1) are control units (4) that control the drive unit (4). The control electronic component (E10) constituting C1) is included. The substrate (B1) is arranged so that its thickness direction is along one direction. The control electronic component (E10) is mounted on the second surface (B12) of the substrate (B1) opposite to the first surface (B11) facing the opening / closing unit (first opening / closing unit U1). According to the tenth aspect, it is possible to reduce the temperature rise in the control electronic component (E10) while achieving miniaturization.

The earth leakage protection device (1) according to the eleventh aspect further includes an interlocking link (9) in any one of the first to tenth aspects. The interlocking link (9) is mechanically connected to the plurality of opening / closing portions (2), and the plurality of contact portions (P1 to P3) are interlocked with each other to open the pole according to the operation of the drive unit (4). .. According to the eleventh aspect, a plurality of contact portions (P1 to P3) can be opened substantially at the same time, and the reliability regarding circuit protection is improved.

The distribution board (100) according to the twelfth aspect includes the earth leakage protection device (1) in any one of the first to eleventh aspects and the housing (101) accommodating the earth leakage protection device (1). , Equipped with. According to the twelfth aspect, it is possible to provide a distribution board (100) provided with an earth leakage protection device (1) capable of miniaturization.

The configuration according to the second to eleventh aspects is not an essential configuration for the earth leakage protection device (1) and can be omitted as appropriate.

1 Leakage protection device 100 Distribution board 101 Housing 2 Opening and closing part 3 Leakage detection part 4 Drive part 5 Load terminal 6 Power supply terminal 7 Heat buffering part 8 Thermal element 9 Interlocking link B1 Board B11 1st surface B12 2nd surface C1 Control Part D1 Pitch interval D2 (heat buffer) dimensions E1 Electronic parts E10 Control electronic parts F1 Partition L1 to L3 Electric circuit L4 Neutral phase electric circuit P1 to P3 Contact part Q1 Peripheral wall U1 First opening / closing unit (opening / closing unit)
W1 Load side wire W2 System power supply side wire X1 Instrument SP1 Space

Claims (12)

1. Multiple open / close parts that have a one-to-one correspondence with multiple contact parts inserted in multiple phase electric circuits and switch the electric circuit of the corresponding phase from the conductive state to the cutoff state by opening the corresponding contact part.
   A board on which one or more electronic components are mounted,
   An earth leakage detection unit that detects an earth leakage related to the multi-phase electric circuit,
   A drive unit that operates according to the earth leakage detection result in the earth leakage detection unit and opens the plurality of contact parts.
   With
   The plurality of opening / closing portions are arranged side by side in one direction to form an opening / closing unit.
   Any one of the substrate, the earth leakage detection unit, and the drive unit, and the remaining two units are separately arranged on both sides of the opening / closing unit in the one direction.
   Leakage protection device.
2. It is further provided with a plurality of load terminals provided corresponding to the multi-phase electric circuits and to which electric wires on the load side are connected.
   The plurality of load terminals are arranged on one side of the opening / closing unit in an orthogonal direction orthogonal to the one direction when the opening / closing unit is viewed from the front.
   The earth leakage protection device according to claim 1.
3. It is further provided with a plurality of power supply terminals provided corresponding to the multi-phase electric lines and electrically connected to the electric wires on the system power supply side.
   Each of the plurality of load terminals and the corresponding power supply terminal are arranged in the orthogonal direction.
   The earth leakage protection device according to claim 2.
4. Further provided with an entity disposed on one of the sides of the opening and closing unit in one direction and covering a portion of the neutral phase electrical circuit.
   Of the substrate, the earth leakage detection unit, and the drive unit, at least the earth leakage detection unit and the drive unit are separately arranged on both sides of the opening / closing unit in the one direction.
   The drive unit is housed inside the body.
   The earth leakage protection device according to any one of claims 1 to 3.
5. Further comprising a heat buffer disposed on at least one of the sides of the opening / closing unit in one direction.
   The earth leakage protection device according to any one of claims 1 to 4.
6. The heat buffer is composed of a space surrounded by a peripheral wall.
   The earth leakage protection device according to claim 5.
7. A partition wall is further provided between the heat buffering portion and the opening / closing portion adjacent to the heat buffering portion among the plurality of opening / closing portions.
   The earth leakage protection device according to claim 5 or 6.
8. Each of the plurality of opening / closing portions has a thermal element that opens the corresponding contact portion in response to a temperature rise.
   The plurality of thermal elements of the plurality of opening / closing portions are arranged at predetermined pitch intervals in the one direction.
   The dimensions of the heat buffer in one direction are equal to or greater than the pitch spacing.
   The earth leakage protection device according to any one of claims 5 to 7.
9. Of the substrate, the earth leakage detection unit, and the drive unit, the substrate and the earth leakage detection unit are arranged on the same one side of both sides of the opening / closing unit in the one direction.
   The earth leakage protection device according to any one of claims 1 to 8.
10. The one or more electronic components include control electronic components that constitute a control unit that controls the drive unit.
    The substrate is arranged so that its thickness direction is along the one direction.
    The control electronic component is mounted on a second surface of the substrate opposite to the first surface facing the opening / closing unit.
    The earth leakage protection device according to any one of claims 1 to 9.
11. Further provided with an interlocking link that is mechanically connected to the plurality of opening / closing portions and opens the poles by interlocking the plurality of contact portions with each other in response to the operation of the drive unit.
    The earth leakage protection device according to any one of claims 1 to 10.
12. The earth leakage protection device according to any one of claims 1 to 11 and a housing for accommodating the earth leakage protection device are provided.
    Distribution board.

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