JP3747841B2 - Earth leakage breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leakage breaker that energizes a coil and forcibly opens a contact of each pole when an unbalanced current between the poles is detected.
[0002]
[Prior art]
As a conventional example, there is one shown in JP-A-8-293679. In this case, the vertical direction of the circuit board attached so that one side of the thickness (primary side penetration) direction of the zero-phase current transformer is opposed to the surface (thickness direction) is arranged in the height direction in the vessel body. At the position corresponding to the earth leakage test button for conducting the earth leakage test provided on the body, attach the earth leakage test movable plate and the earth leakage test fixed contact where the earth leakage test movable plate contacts and separates to the circuit board. ing.
[0003]
The positions of the earth leakage test movable plate and the earth leakage test fixed contact are also attached above the zero phase current transformer on the surface where the zero phase current transformer is attached.
[0004]
[Problems to be solved by the invention]
In the earth leakage breaker described above, the earth leakage test movable plate and the earth leakage test fixed contact are attached above the zero phase current transformer on the surface where the zero phase current transformer is attached. The installation space for these earth leakage test movable plate and earth leakage test fixed contact is required on the zero-phase current transformer mounting surface of the circuit board, the length of the circuit board is increased in the vertical direction, and the height of the device body is particularly high. There was a problem of increasing the size.
[0005]
The present invention has been made in view of such a reason, and an object of the present invention is to provide an earth leakage circuit breaker capable of downsizing the body.
[0006]
[Means for Solving the Problems]
  The earth leakage circuit breaker according to claim 1 includes a handle that can be operated from the upper surface of the body, a plurality of contact points that are opened and closed by rotating the handle, and a zero-phase change that detects an unbalanced current between the poles. A current leakage test button disposed on the upper surface of the current vessel, a current leakage test movable plate driven by the operation of the current leakage test button, and the current leakage test movable plate Install the earth leakage test fixed contact that flows a pseudo unbalanced current and excite the trip coil for forcibly opening the contacts of each pole when the unbalanced current is detected by the zero-phase current transformer In a leakage breaker equipped with a leakage detection circuit for supplying a current and having a circuit board disposed so that both end faces face the upper and lower surfaces of the container,
  The earth leakage test movable plate is disposed on the end surface side of the circuit board located on the upper surface side of the vessel body,Providing a recess in the end surface of the circuit board located on the upper surface side of the body;The earth leakage test fixed contactArranged in the recessIt is characterized by that.
[0007]
According to the earth leakage breaker of the first aspect, the space in the height direction of the circuit board can be effectively utilized, and the device body can be made particularly compact in the height direction.
[0008]
  AlsoThe circuit board has a recess in the end surface, and the leakage test fixed contact is disposed in the recess.Therefore, there are the following effects.
[0009]
  That is,Where the earth leakage test fixed contact is directly attached to the end face of the circuit board, the earth leakage test movable plate can be sufficiently separated from the earth leakage test fixed contact even if it is close to the end face of the circuit board. The interval in the gap direction can be reduced, and the body can be made compact.
[0010]
  Claim2The earth leakage breaker described in claim1The tip of the test movable plate is bent in the fixed contact direction.
[0011]
  Claim2According to the earth leakage breaker described, the claim1In addition to the same effect as above, since the earth leakage test fixed contact is in the dent on the end face of the board, the earth leakage test movable plate is brought into contact with the earth leakage test fixed contact against the one in which the tip of the earth leakage test movable plate is formed straight. This makes it easy to ensure the contact between the earth leakage test movable plate and the earth leakage test fixed contact, and makes it difficult for the earth leakage test movable plate to contact the end face of the circuit board.
[0012]
  Claim3The earth leakage breaker described isClaim 1 or claim 2The end face of the earth leakage test movable plate opposite to the contact end face of the earth leakage test fixed contact is bent so as to contact the circuit board.
[0013]
  Claim3According to the earth leakage breaker describedClaim 1 or claim 2In addition to the same effect as above, the end face of the earth leakage test movable plate is brought into contact with the circuit board, and the earth leakage test movable plate contacts the earth leakage test fixed contact with this point as a fulcrum, so that the earth leakage test movable plate can be easily made elastic. .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
[0015]
In the present embodiment, two fixings arranged in parallel in the width direction of the container body 1 in the container body 1 configured by connecting the first side case 1A and the second side case 1B made of synthetic resin on both sides. The contacts 2A and 2B, the two movable contacts 4A and 4B, to which the movable contacts 3A and 3B that are detachably opposed to the fixed contacts 2A and 2B are fixed, and the two movable contacts 4A and 4B are driven. The movable contact 3A and 3B are brought into and out of contact with the fixed contacts 2A and 2B through the opening and closing mechanism 5 by the opening and closing operation of the handle 6 (contact / release). The fixed contacts 2A, 2B and the movable contacts 4A, 4B are arranged vertically in the height direction of the body 1, and two fixed contacts 2A in the height direction of the movable contacts 4A, 4B. , 2B, one movable contact 4B and the other movable contact 4A The fixed contact 2A to which the movable contact 3A comes in contact is separated from the fixed contact 2A and 2B at a height position where the movable contact 3A and 3B are not separated from each other when viewed from the width direction of the container 1 with the movable contacts 3A and 3B being separated from each other. It is.
[0016]
An intermediate case 7 molded from a synthetic resin material is fixed in one end portion in the longitudinal direction of the container body 1 so as to be sandwiched between both side cases 1A and 1B, and the inner side wall (outer wall) inside the first side case 1A is fixed. The terminal block 10A constituting the output terminal on the voltage electrode side having the fixed contact 2A provided at one end is housed in a section constituted by the concave portion 8 and the vertical wall portion 35 of the intermediate case 7, and the second case of the intermediate case 7 is accommodated. Neutral pole (or other voltage pole) side provided with a lower fixed contact 2B at one end in a section composed of a recess 9 provided on the side case 1B side and a side wall (outer wall) of the second side case 1B The terminal block 10B constituting the output terminal is housed.
[0017]
In the terminal block 10A, an extension piece 11a is integrally extended above a terminal plate 11 bent in a U-shape and one end of a lower piece of the terminal plate 11, and the upper end of the extension piece 11a is perpendicular to the extension piece 11a. A fixed contact 12A that is bent and integrally extended outward with respect to the terminal plate 11, a fixed contact 2A that is caulked and fixed to the upper surface of one end of the fixed contact 12A, and a lower piece of the terminal plate 11 It is comprised with the substantially M-shaped lock spring 13A accommodated in the terminal board 11. FIG. Then, the lower piece of the terminal plate 11 is placed on the bottom inclined surface of the concave portion 8 of the first side case 1A, the extension piece 11a is disposed along the rising wall 8a at one end of the concave portion 8, and the rising wall 8a The fixed contact 12A is led out of the recess 8 beyond the upper end, and is integrally formed between the rising wall 8a and the partition wall 14 rising from the bottom of the first side case 1A in the same manner as the bottom of the recess 8. The terminal block 10 </ b> A is disposed in the recess 8 by disposing the tip of the fixed contact 12 </ b> A on the fixed contact disposition portion 15. The fixed contact placement portion 15 is formed with a recess 15a that allows the lower end of the fixed contact 2A protruding to the lower surface side of the fixed contact 12A to escape. The terminal plate 11 is formed by integrally extending a T-shaped piece 11b upward from the other end of the upper piece, and one end of a side protruding portion at the upper end of the T-shaped piece 11b is formed on the inner surface of the first side case 1A. It mounts on the upper end surface of the formed convex flat part 22. Further, a protrusion 23 is integrally formed on the side surface of the side piece of the terminal plate 11 to be inserted into the holding piece 13b of the locking spring 13A and prevent the locking spring 13A from rattling.
[0018]
The lock spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion. When the intermediate case 7 is superimposed on the first side case 1A, the vertical wall portion at the other end of the first side case 1A. The cross section formed in the semicircular oblique downward groove 160 and the oblique downward groove 160 having the same shape on the wall formed on the opposite wall surface of the intermediate case 7 from the outside through the oblique downward electric wire insertion hole 16A. The core wire of the inserted electric wire (not shown) is press-fitted between the upper piece of the terminal plate 11 and the upper end of the locking piece 13a of the locking spring 13A and the upper end of the holding piece 13b, and the leading end of the locking piece 13a. The core wire is locked in the drawing direction of the electric wire, and the core wire is pressed against the upper piece of the terminal plate 11 by the upper end surface of the pressing piece 13b, so that the core wire is electrically connected and mechanically held. It has become. The wire lock is released by a release handle 17, and the release handle 17 has a rotary shaft 18 provided on a lower side surface thereof rotated in a shaft hole 20 provided on a convex flat portion 22 on the inner side surface of the first side case 1 </ b> A. A shaft (not shown) that is freely pivotally supported and protrudes from the wall surface of the vertical wall portion 35 of the intermediate case 7 is pivotally supported in a recess 37 provided on the other lower side surface. By manually operating and rotating the operating portion 17a exposed to the outside, the drive projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to move the locking piece 13a. It can be bent and the lock on the core wire can be released. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 to rotate in the anti-manual operation direction.
[0019]
On the other hand, the terminal block 10B is basically composed of a terminal plate 11, a lock spring 13B, and a stationary contact 12B, like the terminal block 10A. However, unlike the terminal plate 11 of the terminal block 10A, the terminal block 10B The terminal plate 11 of the block 10B has an extension piece 11c extending downward from one end of the lower piece, and a fixed contact 12B is extended from the tip of the extension piece 11c so as to be parallel to the bottom of the body 1. Further, a back piece 11d extending at a right angle from one end of the side piece of the terminal plate 11 is formed.
[0020]
The lock spring 13B has the same structure as the lock spring 13A, is placed on the lower piece of the terminal plate 11, and a protrusion 23 protruding from the side piece of the terminal plate 11 is inserted into the holding piece 13b. It is like that.
[0021]
The terminal block 10B constitutes the bottom of the concave portion 9 of the intermediate case 7 and places the lower piece of the terminal plate 11 on the lateral wall portion 24 formed so as to extend substantially parallel to the bottom portion of the vessel body 1. The back piece 11d is placed along the vertical wall 25 at one end, and one end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall 24, and the extension piece 11c is recessed. When the intermediate case 7 is overlaid on the first side case 1A side, the tip of the fixed contact 12B, that is, the bottom surface provided with the fixed contact 2B is the bottom of the first side case 1A. Are placed on the ribs 26, 26. That is, the fixed contact 2B is disposed across the side cases 1A and 1B in a space formed between the side wall 24 of the intermediate case 7, the bulging portion 30 described later, and the side walls of the side cases 1A and 1B. The recess between the ribs 26 is a relief at the lower end of the fixed contact 2B, which is fixed by caulking to the tip of the fixed contact 12B, protruding from the lower surface side of the fixed contact 12B.
[0022]
Further, the tip of the side projecting portion at the upper end of the T-shaped piece 11 b that extends upward from the other end of the upper piece of the terminal plate 11 is the upper end surface of the convex flat portion 22 ′ formed on the wall surface of the intermediate case 7. Placed on.
[0023]
The lock spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superimposed on the second side case 1B, the intermediate case 7 is provided in the vertical wall at the other end of the second side case 1B in the same manner as the oblique downward groove 160 having a semicircular cross section provided in the vertical wall portion at the other end of the recess 9. When the electric wire is inserted from the electric wire insertion hole 16B formed by the oblique downward groove 160, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is attached to the upper piece of the terminal plate 11 by the pressing piece 13b. The wires are pressed to electrically connect the wires and are mechanically locked.
[0024]
The wire locking is released by a release handle 17 ′. Like the release handle 17, the release handle 17 ′ has a rotating shaft 18 provided on the lower side surface provided on the convex flat portion 22 ′ of the intermediate case 7. A shaft 38 that is pivotally supported in the shaft hole 20 and protrudes from the inner wall surface of the second side case 1B is pivotally supported in a recess 37 formed on a side surface thereof. When the operating portion 17a exposed to the outside is manually operated and rotated, the driving projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13B to bend the locking piece 13a. You can now unlock the locked state. In the figure, reference numeral 21 'denotes a return spring that constantly urges the release handle 17' to rotate in an anti-manual operation direction.
[0025]
The intermediate case 7 is formed with a bulging portion 30 that protrudes toward the second side case 1B with respect to the vertical wall portion 35 substantially parallel to the side walls of the two side cases 1A and 1B and contacts the inner surface of the side wall of the second side case 1B. The wall suspended from the lower surface of the bulging portion 30 is the vertical wall 25, and is a recess surrounded by the side wall, the bottom wall, the vertical wall 32 at one end, and the ceiling wall 33 facing the second side case 1B. Is provided on the first case 1A side. Then, when the intermediate case 7 is abutted against the first side case 1A side, the front end side portion of the fixed contact 12A of the terminal block 10A assembled on the first side case 1A side is placed on the step surface of the bottom wall of the recess. The ceiling wall 33 is arranged along the lower surface of the lateral wall 29 protruding from the inner surface of the first case 1A. The vertical wall 32 is formed with an opening (not shown) for inserting the free end of the movable contact 4A corresponding to the fixed contact 2A into the recess.
[0026]
On the other hand, inside the other end in the longitudinal direction of the container body 1, the lowermost step among three conductive bars (not shown) respectively arranged at different positions (vertical direction in FIG. 1) in the distribution board. A storage portion 90 for storing and arranging one common terminal T1 for plug-in connection of the conductive bar of the voltage electrode, and one of the remaining one of the voltage electrode and the neutral electrode conductive bar is selected and connected. An inner storage portion 200 is provided in which one selection terminal T2 is movably disposed between at least two positions corresponding to the remaining one voltage electrode and neutral electrode conductive bar.
[0027]
Both the common terminal T1 and the selection terminal T2 which are plug-in type input terminals are substantially U-shaped, and are constituted by blade receiving springs which are spread toward the tip after the tips of both side pieces parallel to each other are close to each other. The conductive bar can be easily inserted by widening the tip, and the conductive bar is sandwiched between the central adjacent portions.
[0028]
The inner storage portion 200 has an inner side of the first side case 1A as positioning means for positioning the selection terminal T2 at two positions respectively corresponding to the remaining two conductive bars of the voltage electrode and the neutral electrode. A protrusion 97 having a substantially semicircular cross section is provided in the width direction of the first case 1 </ b> A on the end wall surface of the compartment constituting the storage unit 200.
[0029]
On the wall corresponding to the ceiling of the inner housing part 200 of the container 1, it is indicated whether the selection terminal T <b> 2 is at a position corresponding to one of the remaining two voltage bars or neutral conductive bars. As a display means, a through hole 201 communicating with the inner storage portion 200 is provided, and a columnar display portion 202 formed on the upper portion of the slide member 83 storing the selection terminal T2 from the through hole 201 is formed in the through hole 201. The position of the selection terminal T2 can be known depending on whether it can be visually recognized from the outside or at a position away from the through hole 201 and cannot be visually recognized from the outside, and it is confirmed whether the connection is 100V or 200V. Can do. Further, the slide member 83 can be pushed downward from the outside through the through hole 201 and moved downward. The through-hole 201 is a circular hole formed by abutting a semicircular cut-out hole 201a provided on the upper side walls of the two side cases 1A and 1B.
[0030]
The slide member 83 is formed of a synthetic resin molded product and is formed in a frame shape with both end faces corresponding to both end directions of the container body 1 being opened, and a blade receiving spring constituting the selection terminal T2 is inserted from one end opening. The tip end of the blade receiving spring protrudes from the other end opening, and the selection terminal T2 is arranged so as to be movable in the vertical direction in FIG.
[0031]
A guide groove in the vertical direction in which slide projections 203 formed on both side portions of the slide member 83 are slidably engaged and slid on the inner surfaces of the side walls of both side cases 1A and 1B constituting both side walls of the inner storage portion 200. 204 is formed between two parallel projections 205, and the inner housing portion 200 has the slide member 83 in a state where the slide projections 203 on both sides of the slide member 83 are engaged with the guide grooves 204, 204 on both side walls. At the same time, the selection terminal T2 is stored and held so as to be slidable in the vertical direction. Note that a slide protrusion may be provided on the inner storage portion 200 side, and a guide groove may be provided on the slide member 83 side.
[0032]
As shown in FIG. 3, the slide member 83 is integrally formed with a leg piece 83a extending downward in the drawing as shown in FIG. 3, and protrudes outward from the lower end of the leg piece 83a. A protrusion 206 is formed.
[0033]
As shown in FIG. 12, the protrusion 206 has an upper end of a slide groove 207 formed upward from the bottom surface of the first side case 1A on the outside of the side wall of the first side case 1A constituting the side wall of the inner storage portion 200. It is inserted into the slide groove 207 through an insertion hole 208 that is open at the bottom so as to communicate with the inner storage portion 200, and is slidable in the slide groove 207 along with the leg piece 83a in the vertical direction.
[0034]
The slide groove 207 and the insertion hole 208 constitute a guide part for moving the slide member 83 mounted with the selection terminal T2 up and down, and the bottom part of the slide groove 207 is formed so as to protrude into the inner storage part 200. The back surface of the leg piece 83a inserted upward into the slide groove 207 through the insertion hole 208 formed in the upper end bottom portion of the slide groove 207 can come into sliding contact with the bottom portion of the slide groove 207. In addition, a protrusion 207 a that abuts when the protrusion 206 moves to the upper end of the slide groove 207 is provided at the top of the slide groove 207.
[0035]
Thus, the protruding portion 206 constitutes an operating portion for moving the selection terminal T2 in the inner storage portion 200 up and down, and is held by the protruding portion 206 from the outside of the container 1 or pushed up or down by a driver or the like. If the slide movement in the slide groove 207 is performed, the slide member 83 in the inner storage portion 200 is moved up or down by the guide by the slide protrusion 203 and the guide groove 204 together with the selection terminal T2 along with the slide movement. Become.
[0036]
When the slide member 83 is moved by the above operation, the upper end or the lower end of the slide member 83 gets over the positioning projection 97 by its elasticity and the rounded surface of the positioning projection 97, and after the movement, the frame portion 83 is moved to the positioning projection 97. The position of the selection terminal T2 is held by hitting the lower end or the upper end of the tip.
[0037]
The opening / closing mechanism 5 that opens and closes the movable contacts 4A and 4B is a first member that includes an operation plate 43 that is a latch member, a crossbar 40, and a stepped locking portion 41e that locks one end of the operation plate 43. It consists of a tripping plate 41, a second tripping plate 42, a handle 6, a U-shaped link 44 and the like. If a large current such as a short circuit current flows instantaneously in the closed state of the main contacts (the fixed contacts 2A and 2B and the movable contacts 3A and 3B), the first electromagnetic release device 47 causes a leakage current in the main circuit. If the current flows, the second electromagnetic release device 48, and if an overcurrent such as an overload current flows, the thermal release device (45, 46) releases the switching mechanism 5 to forcibly set the main contact. Open the pole.
[0038]
The handle 6 includes an operation unit 6a, a rotation unit 6b, and a handle shaft 6c, and a shaft formed on the inner surface of the first case 1A with a handle shaft 6c protruding from the center of both side surfaces of the rotation unit 6b. A hole 49 and a shaft hole 49 formed on the inner side surface of the second side case 1B are rotatably inserted and held between the side cases 1A and 1B. The operating portion 6a is connected to the side cases 1A and 1B. It faces the window hole 50 opened to the upper surface of the container 1 configured in a connected state. A torsion spring (not shown) is mounted on the handle shaft 6c, and the handle 6 is urged in the opening operation direction by the torsion spring at the closing operation position (see FIG. 2).
[0039]
An upper shaft 44 a of the U-shaped link 44 is rotatably inserted into the shaft hole 52 provided at the lower end of the rotating portion 6 b and is connected to the operation plate 43 via the U-shaped link 44.
[0040]
The actuating plate 43 is connected to the handle 6 via the U-shaped link 44 by inserting the lower shaft 44b of the U-shaped link 44 through bearing holes 43a provided on both sides of the center, and moves up and down in the container 1 Arranged freely.
[0041]
The cross bar 40 is inserted into shaft holes 52, 52 formed on the inner side surfaces of both side cases 1A, 1B with shafts 40a projecting on both side surfaces of the upper part, and is pivotally supported between the side cases 1A, 1B. 12, the side of the first case 1 </ b> A slightly below the shaft 40 a has a cut groove 54 for fitting the side of the movable contact 4 </ b> A from the lateral direction, and the lower side of the second case 1 </ b> B. Each part is provided with a kerf 55 for fitting the movable contact 4B from the lateral direction. In the movable contact side end face, the stop piece 130 protruding from the inner surface of the side wall of the intermediate case 7 and the first side case 1A is in a state where the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B. A concave groove 131 is formed in the width direction so as to be engaged with and abut against the bottom (see FIG. 13).
[0042]
Here, the movable contact 4A is composed of a rigid conductive metal plate, and is inserted into the cut groove 54 of the crossbar 40 from the side, and in a recess (not shown) provided behind the cut groove 54, the rear portion The rear portion is biased upward by a coil spring 53 for contact pressure that is compressed between the lower surface and the bottom of the recess, and is movable when the crossbar 40 rotates about the shaft 40a. The contact 4A rotates about the opening edge of the kerf 54 so that the movable contact 3A, which is caulked and fixed to the free end, is separated and brought into contact with the corresponding fixed contact 2A.
[0043]
The movable contact 4B is made of a conductive spring thin plate material. When the cross bar 40 is rotated in the closing operation direction, the movable contact 4B is pressed downward to be bent, and from this bent state, the cross bar 40 is rotated in the opening operation direction. The movable contact 3B that is caulked and fixed to the tip is brought into contact with and separated from the fixed contact 2B by the return and the bending and the return.
[0044]
The lower end portion of the cross bar 40 is pressed by a coil spring 62 that is compressed between the lower end portion and a wall 63 that is suspended from the bottom portion of the first side case 1 </ b> A, so that a rotational force is applied.
[0045]
The first tripping plate 41 includes a shaft portion 41a, a protrusion portion 41b protruding above the shaft portion 41a, and a pair of leg portions 41c and 41d protruding below the shaft portion 41a, and both ends of the shaft portion 41a. Is inserted into shaft holes 56, 56 provided on the inner side surfaces of both side cases 1A, 1B, and is supported rotatably between both side cases 1A, 1B. Further, the return spring 301 using a torsion coil spring biases the operation plate 43 in the latching direction. A locking portion 41e with which one end of the operating plate 43 is engaged and disengaged is formed at the upper end portion of the projecting portion 41b, and a receiving portion (not shown) that is driven and driven by a bimetal 45 described later is formed on the tip side of one leg portion 41c. ) And a receiving portion 41f that is pushed and driven by the second tripping plate 42 is provided on the tip side surface of the other leg portion 41d. Further, the magnetic plate 340 is fixed so as to face the base end side of the bimetal 45 at the upper part of the shaft portion 41 a of the first tripping plate 41. For example, a protrusion is provided on the first tripping plate 41 and a hole is formed in the magnetic plate 340 to be fitted and fixed to the protrusion. Here, a U-shaped short-circuit detecting yoke 341 is disposed on the opposite side of the magnetic plate 340 with the bimetal 45 in between, and both sides of the yoke are close to the magnetic plate 340 from both sides of the bimetal 45. The yoke 341 is fixed to the container 1 or the partition member 31. Therefore, when a short-circuit current flows through the bimetal 45, a large magnetic flux generated around the bimetal 45 is generated by the yoke 341 and the magnetic plate 340 before the first tripping plate 41 is bent when the bimetal 45 is heated. Passing through the magnetic circuit, the magnetic plate 340 is attracted to the yoke 341, and the first tripping plate 41 is rotated in the direction of releasing the operating plate 43.
[0046]
The second tripping plate 42 is formed in a substantially square shape in which a facing portion 42a and a receiving portion 42c protrude from a central portion having a shaft hole 42b, and a shaft 31f provided on a partition wall member 31 described later is inserted into the shaft hole 42b. And pivotally supported. A driving piece 42d is provided on the end face of the facing portion 42a so as to face the lower end of the bimetal 46 described later and to be pushed when the bimetal 46 is bent.
[0047]
On the conductive plates 71A and 71B made of thick metal material, bimetals 45 and 46 constituting a thermal release device are respectively welded and fixed and suspended. One end of the braided wire 79A having one end welded to the common terminal T1 is welded to the fixed portion of the one bimetal 45 to the conductive plate 71A, and one end is connected to a first circuit board 73 to be described later. The other end of the braided wire 79B having one end welded to the selection terminal T2 is welded to the portion where the wire 82A is welded and the other bimetal 46 is fixed to the conductive plate 71B, and the current is connected to the movable contact 4B. The other end of the braided wire 79C, one end of which is welded to a conductor 80 (described later), is welded to the substantially central portion of the bimetal 46, the common terminal T1, the braided wire 79A, the conductive plate 71A, the bimetal 45, the braided wire 79D, and movable contact. The child 4A is electrically connected, and the selection terminal T2, the braided wire 79B, the conductive plate 71B, the bimetal 46, the braided wire 79C, the conducting conductor 80, and the movable contact 4B are electrically connected. Has been. The bimetals 45 and 46 can be adjusted at their lower end positions by screwing the adjusting screws 77 and 77 '. However, the adjusting mechanism is not the gist of the present invention, and thus detailed description thereof is omitted.
[0048]
Incidentally, the conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition wall member 31. The partition member 31 is made of a synthetic resin molded product having insulation properties, and a flat partition wall 31a that separates the two bimetals 45 and 46, and from the periphery of the partition wall 31a to both sides in the thickness direction (the width direction of the container 1). The conductive plate 71A and the bimetal 45 and the conductive plate 71B and the bimetal 46 are accommodated in the recesses 31c and 31c surrounded by the partition wall 31a and the peripheral wall 31b. A plurality of protrusions 31d are provided so as to face each other on the upper peripheral wall 31b of the recesses 31c and 31c, and the conductive plates 71A and 71B and the bimetal 45 are pressed by inserting the conductive plates 71A and 71B between the protrusions 31d. 46 are held by the partition wall member 31. In addition, rectangular cutouts 31e and 31e are formed on the upper peripheral wall 31b of the recesses 31c and 31c in which the conductive plates 71A and 71B are accommodated so that the adjusting screws 77 and 77 ′ face the outside of the recesses 31c and 31c. It is. Further, a shaft 31 f that is inserted into the shaft hole 42 b of the second tripping plate 42 projects from the bottom of the recess 31 c on the side where the conductive plate 71 B and the bimetal 46 are accommodated.
[0049]
As shown in FIG. 6, the first electromagnetic release device 47 includes a fixed iron core 57 formed by bending a magnetic iron plate into a substantially U shape in plan view, a movable iron core 58 formed of a rectangular flat magnetic iron plate, and a movable iron core. 58 is constituted by a leaf spring 59 which is an elastic member which is supported in a swingable manner on both end magnetic pole surfaces of the fixed iron core 57 and elastically urges the movable iron core 58 in a direction away from the fixed iron core 57. The conducting conductor 80 has an inner piece 80a in which one end of the braided wire 79C is welded to the front end portion, and an outer piece 80b that extends substantially L-shaped from the rear end of the inner piece 80a and faces the inner piece 80a substantially in parallel. The rear end of the movable contact 4B is connected to the front end of the outer piece 80b.
[0050]
The movable iron core 58 is fixed to the leaf spring 59 by inserting and fixing the projections 58a and 58a projected on the surface on the fixed iron core 57 side into holes 59b and 59b formed at one end of the central piece 59a of the leaf spring 59. It is swingably supported. On the other hand, the leaf spring 59 is arranged so that both side pieces 59c, 59c formed by bending on both sides of the central piece 59a are arranged along the outer surfaces of the both side pieces 57a, 57a of the fixed iron core 57, and are arranged at the ends of the both side pieces 59c, 59c. The engaging pieces 59d and 59d that protrude in the direction are engaged with recesses 57b and 57b formed at the outer corners of the fixed iron core 57, whereby the inner piece 80a of the conductive conductor 80 is fixed to the fixed iron core as shown in FIG. The movable iron core 58 is sandwiched between the inner piece 80a and the outer piece 80b so that the movable iron core 58 is sandwiched between the inner piece 80a and the outer piece 80b. At this time, the magnetic pole surface, which is the tip of both side pieces 57a, 57a of the fixed iron core 57, opposes the movable iron core 58 through the space between the center piece 59a of the leaf spring 59 and both side pieces 59c, 59c.
[0051]
Therefore, when an overcurrent such as a short-circuit current flows through the conducting conductor 80, the movable iron core 58 is attracted and oscillated by the electromagnetic attraction force generated on the magnetic pole surfaces of the both side pieces 57a and 57a of the fixed iron core 57. In addition, since the fixed iron core 57 and the movable iron core 58 are connected to each other by the leaf spring 59 in this way, the first electromagnetic release device 47 can be easily assembled into the body 1 as will be described later. It is.
[0052]
Here, the direction of the electromagnetic attracting force generated on the magnetic pole surfaces of the both side pieces 57a, 57a of the fixed iron core 57 by the current flowing through the inner piece 80a of the current-carrying conductor 80, and the both side pieces 57a of the fixed iron core 57 by the current flowing through the outer piece 80b. The direction of the electromagnetic attractive force generated on the magnetic pole surface of 57a is made the same, and the electromagnetic attractive force for attracting the movable iron core 58 is strengthened so that the main contact is quickly opened. Further, since the current-carrying conductor 80 is not shared with the bimetals 45 and 46 of the thermal release device, the distance between the fixed iron core 57 and the movable iron core 58 can be narrowed compared to the conventional example in which the current-carrying conductor 80 is also used as the bimetal. Further, it is possible to reduce the size of the fixed iron core 57 and the movable iron core 58 in the facing direction.
[0053]
On the other hand, the second electromagnetic release device 48 is configured by winding an exciting coil 68 around the fixed iron core 57 of the first electromagnetic release device 47. As shown in FIG. 6, the coil frame 69 formed in a rectangular tube shape with one side surface opened by an insulating material such as a synthetic resin is protruded from the side pieces 57a and 57a of the fixed iron core 57 from both ends in the axial direction. As shown in FIG. 7, a coil 68 is wound between outer casings 69a and 69a provided at both ends of the coil frame 69 in the axial direction. In the vicinity of the opened side surfaces of the outer casings 69a and 69a of the coil frame 69, substantially cubic holding pieces 69b and 69b are projected, and conductive mounting pins 69c projecting from the side surfaces of the holding pieces 69b and 69b. 69c, the ends of the coil 68 are tangled.
[0054]
An outer flange 69a of the coil frame 69 projects in the axial direction, and protrudes outward from an end surface of a circuit board 73 (described later) to the housing 75 of the zero-phase current transformer ZCT. For example, a coil frame holding part 310 having an L-shaped cross section is provided to which the coil frame 69 is engaged when the coil frame 69 is slid in the direction toward the zero phase current transformer. The outer casing 69a is composed of a narrow portion and a wide portion inserted into the coil frame holding portion 310, and the amount of insertion into the coil frame holding portion 310 is restricted by an end portion 69d on the narrow portion side of the wide portion. Thus, if the coil 68 is connected to the circuit board 73 after the coil frame 69 is slid to the coil frame holding part 310 of the zero-phase current transformer ZCT, the coil frame 69, the zero-phase current transformer ZCT and the circuit board are connected. 73 can be made into a block, and since the lead wire for connecting the circuit board 73 and the coil 48 can be connected in this blocked state, the assembling work into the container body 1 becomes easy. .
[0055]
Further, a pair of mounting pins 69c and 69c having a proximal end connected to each terminal of the coil 68 and a distal end connected to the circuit board 73 are attached to the coil frame 69, and the coil frame 69 is attached to the zero-phase current transformer ZCT. The circuit board 73 is provided with a pair of mounting holes 311 into which the distal ends of the mounting pins 69c are inserted when the housing 75 is slid to the coil frame holding portion 310. Thereby, if the coil frame 69 is slid to the coil frame holding part 310 of the zero-phase current transformer ZCT, the pair of mounting pins 69c are inserted into the mounting holes 311 of the circuit board 73, and the coil 68 and the circuit Electrical connection with the substrate 73 can be facilitated.
[0056]
These mounting pins 69c are bent in such a manner that they extend in a direction away from the board mounting piece 312 on the front end side and the board mounting piece 312 inserted into the mounting hole 311 of the circuit board 73, and the end of the coil 68 is terminated. The coil mounting pieces 313 of the respective mounting pins 69c are formed on both sides of the coil frame 69 which is formed in a substantially L shape including the coil mounting pieces 313 on the proximal end side to be connected and protrudes from the winding surface on which the coil 68 is wound. The above-described pair of holding pieces 69b having through holes 314 that can be inserted is provided. Therefore, when the coil 68 is wound around the coil frame 69, the holding piece 69b does not get in the way, and the coil 68 can be easily wound. Further, the mounting pins 69c that are linear from the base end to the tip end of the pair of holding pieces 69b protruding from the winding surface have a long interval between the mounting pins 69c, but the circuit board 73 cannot be reduced in size. The circuit board 73 can be reduced in size because it is bent in an L shape so as to approach each other.
[0057]
The mounting pin 69c has at least the coil mounting piece 313 and the through hole 314 of the coil frame 69 formed in a non-circular cross section such as a square hole, and the board mounting piece 312 is coiled when the coil mounting piece 313 is inserted into the through hole 314. Rotation about the mounting piece 313 is restricted. Since the coil mounting piece 313 of the mounting pin 69c cannot be rotated when inserted through the through hole 314, the tip of the mounting pin 69c is easily aligned with the mounting hole 311 of the circuit board 73 in a fixed state. The operation of inserting the tip of the attachment piece 312 into the attachment hole 311 of the circuit board 73 is facilitated.
[0058]
In addition, when the coil mounting piece 313 of the mounting pin 69c is passed through the through hole 314, a pair of locking portions 315 and 316 that are locked to both surfaces of the holding piece 69b with the holding piece 69b of the coil frame 69 interposed therebetween are coil-mounted. It is provided on the piece 313. In this case, the tip end of the coil attachment piece 313 is formed in a tapered shape so that it can be easily inserted into the through hole 314, and the rear end portion of the taper is used as a locking portion 315. Therefore, if the pair of locking portions 315 and 316 of the mounting pin 69c are locked to the holding piece 69b of the coil frame 69, the tip of the mounting pin 69c can be easily aligned with the mounting hole 311 of the circuit board 73. This facilitates the operation of inserting the tip of the board mounting piece 312 of the mounting pin 69c into the mounting hole 311 of the circuit board 73.
[0059]
Thus, when a leakage current such as a ground fault current flows, the coil 68 is energized by the leakage protection circuit 51 described later to excite the fixed iron core 57, and the magnetic pole surfaces of both side pieces 57a and 57a of the fixed iron core 57 are excited. An electromagnetic attraction force is generated to cause the movable iron core 58 to be attracted and oscillated. That is, by winding the coil 68 around the fixed iron core 57, the fixed iron core 57, the movable iron core 58, and the leaf spring 59 constituting the first electromagnetic release device 47 can be used as the second electromagnetic release device 48. Compared to the conventional case where the first electromagnetic release device for short circuit protection and the second electromagnetic release device for leakage protection are made up of independent parts, the number of parts can be reduced and space saving can be achieved. In addition, the size can be reduced.
[0060]
Further, since the energizing directions of the coil 68 and the energizing conductor 80 (inner piece 80a) between the fixed iron core 57 and the movable iron core 58 coincide, the coil 68 is energized and the second electromagnetic release device 48 operates. The electromagnetic attractive force generated on the magnetic pole surfaces of the both side pieces 57a and 57a of the fixed iron core 57 can be increased, and the main contact can be opened quickly. Further, since the coil 68 is wound around the fixed iron core 57, the coil 68 does not move, so that the coil 68 can be prevented from being disconnected. However, the coil 68 may be wound around the movable iron core 58.
[0061]
The earth leakage protection circuit 51 has the circuit configuration shown in FIG. 8, and the voltage circuit (braided wire 79A) of the main circuit and the circuit (braided wire 79B) of the neutral electrode (or other voltage electrode) pass through. When the current flowing in each pole of the main circuit becomes unbalanced due to a leakage current such as a ground fault current, the zero-phase current transformer ZCT is inserted between the output terminals of the zero-phase current transformer ZCT according to the degree of unbalance. Current (detection current) flows. This detection current is an alternating current and is clamped by a clamp circuit composed of diodes D1 and D2 connected in antiparallel, and the detection current is converted into a voltage by charging the smoothing capacitor C1 through the resistor R1. Then, the voltage across the smoothing capacitor C1, that is, the detection voltage converted from the detection current is input to the leakage current determination circuit 51a.
[0062]
The power source of the leakage current determination circuit 51a is connected to the series circuit of the diode D3, resistors R2 to R5, and the smoothing capacitor C2 through the coil 68 of the second electromagnetic release device 48, and the voltage pole of the main circuit and the neutral pole (or other voltage). And the voltage across the smoothing capacitor C2 is applied to the power supply terminal and the ground terminal of the leakage current determination circuit 51a. In addition, a series circuit of a coil 68, a thyristor SCR, and a diode D3 is connected between the voltage pole and the neutral pole (or other voltage pole) of the main circuit, and control is performed from the output terminal of the leakage current determination circuit 51a. By applying a signal to the gate of the thyristor SCR, the thyristor SCR is turned on. A snubber circuit including a capacitor C0 and a resistor R0 is connected between both ends of the thyristor SCR.
[0063]
The leakage current determination circuit 51a compares the detected voltage with a predetermined threshold, charges or discharges the capacitor C3 according to the comparison result, and outputs a control signal from the output terminal according to the voltage across the capacitor C3. Configured to delay results. Accordingly, when a leakage current flows through the main circuit, the thyristor SCR is turned on by the control signal, and the coil 68 is energized, whereby the second electromagnetic release device 48 is operated, and the movable iron core 58 is attracted to the fixed iron core 57. The leakage current determination circuit 51a is formed of an integrated circuit, and is externally connected with the capacitor C3 and a resistor R6 that determines a time constant for discharging the capacitor C3 after detecting the leakage.
[0064]
Between the voltage pole and neutral pole (or other voltage pole) of the main circuit, a series circuit of a resistor RT, a normally open test switch SW, and a lead 70a inserted into the zero-phase current transformer ZCT is provided. A test circuit 70 is connected. That is, by turning on the test switch SW and passing a current through the lead 70a, an unbalanced current is caused to flow to the primary side of the zero-phase current transformer ZCT to create a pseudo-leakage state, and the leakage protection circuit 51 operates normally. You can test whether or not you want to. A surge absorbing element SA is connected in parallel to the resistor RT and the test switch SW.
[0065]
By the way, the plurality of types of circuit components constituting the leakage protection circuit 51 and the test circuit 70 are mounted on first and second circuit boards 73 and 74 formed of a printed (wiring) board as shown in FIG. On the first circuit board 73, high-power circuit components (resistors R2, R3, diode D3, test circuit 70, A snubber circuit or the like) is mounted, and the second circuit board 74 has a weak electric circuit component (leakage current determination circuit 51a, clamp circuit, smoothing capacitor C1, zero phase) constituting the weak electric circuit on the right side from the boundary line W. Current transformer ZCT, etc.) and a thyristor SCR are mounted. The test switch SW includes a movable contact plate 76a which is an earth leakage test movable plate having one end bonded to the first circuit substrate 73 and supported to be swingable, and the first circuit substrate so as to face the movable contact plate 76a. The test button 78 is pressed when the test button 78, which is configured by the earth leakage test fixed contact 76b mounted on the movable contact plate 76a and is movably disposed on the free end of the movable contact plate 76a, is pressed. The driven movable contact plate 76a comes into contact with the fixed contact 76b and is turned on.
[0066]
In this case, the movable contact plate 76a is disposed on the end surface side of the circuit board 73 located on the upper surface side of the device body, and the leakage test fixed contact 76b is formed on the end surface of the circuit board located on the upper surface side of the device body. Thereby, the space in the height direction of the circuit board 73 can be used effectively, and the body 1 can be made compact (particularly in the height direction). The movable contact plate 76 a is disposed substantially parallel to the end surface of the circuit board 73, and a leg piece 328 extending in parallel with the circuit board 73 is extended from one end portion thereof, and the tip thereof is bent and fixed to the circuit board 73. . In addition, an earth leakage test movable contact plate is provided for the case where a recess 326 is provided on the end face of the circuit board 73 and the earth leakage test fixed contact 76b is provided in the depression 326 and the earth leakage test fixed contact is directly attached to the end face of the circuit board 73. Even if 76a is brought close to the end surface of the circuit board 73, it can be sufficiently separated from the leakage test fixed contact 76b, and the space between the upper and lower surfaces of the body 1 can be narrowed, and the body 1 can be made compact. . Further, the test movable contact plate 76a has its tip 329 bent in the direction of the fixed contact, and since the earth leakage test fixed contact 76b is in the recess 326 of the end face of the substrate 73, the tip of the earth leakage test movable contact plate 76a is straightened as it is. With respect to the formed circuit board, the leakage test movable contact plate 76a can be easily brought into contact with the leakage test fixed contact 76b, and the contact between the leakage test movable contact plate 76a and the leakage test fixed contact 76b can be easily ensured. It becomes difficult for the earth leakage test movable contact plate 76a to come into contact with the end face. On the other hand, the end face of the end portion 360 opposite to the tip 329 which is the end face of the earth leakage test fixed contact of the earth leakage test movable contact plate 76 a is bent so as to contact the upper edge of the circuit board 73. When the earth leakage test movable contact plate 76a is pressed with the test button 78, the movable contact plate 76a tries to incline in the width direction with the leg piece 328 as a fulcrum, but the end surface of the end portion 360 contacts the upper end surface of the circuit board 73. Since the earth leakage test movable contact plate 76a contacts the earth leakage test fixed contact 76b with the fulcrum as a fulcrum, the earth leakage test movable contact plate 76a can be easily made elastic.
[0067]
The zero-phase current transformer ZCT has a ring-shaped core (not shown) wound with a winding (not shown) as shown in FIG. A pair of output terminals 75a projecting from the end of the side of the housing 75 facing the axial direction of the core (the direction of the arrow shown in FIG. The output terminal 75a is inserted into the wiring board 74a and soldered to the wiring pattern (not shown) on the back surface with the housing 75 being in close contact with the surface of the second circuit board 74.
[0068]
Further, as shown in FIG. 1, the housing 75 of the zero-phase current transformer ZCT has contact pins 67a to 67e as a plurality of attachment portions for attaching the first and second circuit boards 73 and 74 on both sides in the axial direction. Projected from the surface. These contact pins 67a to 67e are made of metal, and the axial direction of the contact pins 67a to 67e is aligned with the axial direction of the zero-phase current transformer ZCT, and both ends protrude from the side surfaces of the housing 75. A boss portion 75c that covers the contact pins 67a to 67e leaving the tip thereof and another boss portion 75c 'are formed integrally with the housing 75 on the side surface facing the first circuit board 73. .
[0069]
On the other hand, the first and second circuit boards 73 and 74 have through holes 73a and 74b inserted through the contact pins 67a to 67e, respectively, and the contact pins 67a to 67e inserted into the through holes 73a and 74b. The first and second circuit boards 73 and 74 are distributed and attached to both side surfaces in the thickness direction (axial direction) of the zero-phase current transformer ZCT. At this time, the contact pins 67a to 67d also serve as a current path between the two circuit boards 73 and 74, and the circuit components mounted on the first and second circuit boards 73 and 74 are electrically connected via the contact pins 67a to 67e. Connected. Further, a contact pin 67e is provided in the vicinity of the through hole 75b opened in the center of the housing 75, and this contact pin 67e serves as a lead 70a of the test circuit 70 that penetrates the core of the zero-phase current transformer ZCT. The first and second circuit boards 73 and 74 are provided with circular insertion holes 73b and 74c that communicate with the through holes 75b of the housing 75 and through which the braided wires 79A and 79B are inserted. The first circuit board 73 has one end of a lead wire 82A connected to the voltage pole of the main circuit via the conductive plate 71A and a connection for connecting to the neutral pole (or other voltage pole) of the main circuit. The other end of the lead wire 82B whose one end is welded to the member 99 is connected.
[0070]
Furthermore, the second circuit board 74 is attached to the side surface opposite to the first circuit board facing surface side of the zero-phase current transformer ZCT, but extends in the same direction as the protruding direction of the coil frame holding portion 310. The insulating plate 320 is disposed between the second circuit board 74 and the coil frame 69. As a result, the distance between the second circuit board 74 and the coil frame 69 can be reduced, and the two circuit boards 73 and 74 are disposed so as to sandwich the zero-phase current transformer ZCT. The body 1 can be stored compactly, and the body 1 can be made compact.
[0071]
The insulating plate 320 is connected to the first insulating piece 321 interposed between the second circuit board 74 and the coil frame 69 and the second circuit board 74 between the first insulating piece 321. A second insulating piece 322 provided, and a connecting piece 323 for connecting the first insulating piece 321 and the second insulating piece 322 to each other. The second insulating piece 322 has an electric circuit inserted through the zero-phase current transformer ZCT. A through hole 324 facing the hole 75b and a notch 325 continuous from the through hole 324 to the end surface are formed. As described above, when the insulating plate 321 is disposed so as to sandwich the second circuit board 74 and the energizing wires 79A and 79B serving as electric paths are inserted from the notch 325, the insulating plate 320 is detached by the energizing wires 79A and 79B. This eliminates the need for attaching the insulating plate 320.
[0072]
Thus, a plurality of types of circuit components constituting the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and second circuits are disposed on both sides in the thickness direction of the zero-phase current transformer ZCT. Since the boards 73 and 74 are arranged and accommodated in the container 1, each circuit board 73, 74 is compared with the case where the leakage protection circuit 51 and the zero-phase current transformer ZCT are mounted on one circuit board as in the prior art. The size of 74 in the longitudinal direction can be reduced, and the body 1 can be miniaturized. Further, by providing the contact pins 67a to 67e as the mounting portions on the housing 75 of the zero-phase current transformer ZCT, the zero-phase current transformer ZCT can be easily attached to the first and second circuit boards 73 and 74. . Furthermore, since the attachment portion is made of metal contact pins 67a to 67d and is an energization path for electrically connecting the first and second circuit boards 73 and 74, when wiring using a separate lead wire or the like, In comparison, there is an advantage that the current path between the circuit boards 73 and 74 can be easily formed, and the contact pins 67a to 67e are insert-molded (or press-fitted) into the housing 75, so that the winding of the zero-phase current transformer ZCT is provided. Can be insulated.
[0073]
Since the contact pin 67e is the lead 70a of the test circuit 70, the first and second circuit boards 73 and 74 are attached to the zero-phase current transformer ZCT so that the lead 70a of the test circuit 70 is the zero-phase current transformer. It can be easily inserted into the ZCT core. Further, a high-power circuit component constituting a high-power circuit is mounted on the first circuit board 73, and a weak-power circuit component mainly constituting a low-power circuit is mounted on the second circuit board 74. Therefore, it is possible to mount more circuit components on the second circuit board 74 on which light-electric circuit components that can shorten the insulation distance compared to the high-electric system are mainly mounted. Here, the lead wire 82A for connecting to the voltage electrode of the main circuit and the lead wire 82B for connecting to the neutral electrode (or other voltage electrode) are mounted on the first circuit board 73 on which high-voltage circuit components are mounted. Therefore, in the second circuit board 74, there is an advantage that the circuit components can be arranged without considering the insulation distance from the connection position of the lead wires 82A and 82B.
[0074]
In addition, the leakage detection device that outputs a leakage detection signal when the predetermined output of the zero-phase current transformer ZCT reaches a predetermined time connected to the electric circuit between the input / output terminals of each pole as described above, It is on the input terminal side of the pole contact. For this reason, when the circuit breaker is turned off and a test pin is brought into contact between each output terminal to perform load insulation measurement, the test current for insulation resistance measurement does not flow through the connection point of the leakage detection device, This makes it easy to measure the load insulation. In addition, since the input side terminal is always a plug-in type and the output side terminal is a connecting terminal having a lock spring, there is no possibility that an operator will reversely connect. For this reason, if there is a power connection point of the leakage detection device on the input side, the insulation resistance measurement on the output side can be easily performed.
[0075]
Further, one of the connection points of the leakage detecting device is disposed on the fixed contact opposing surface side of one movable contact 4B, and contacts the movable contact 4B while the movable contact 3B is in contact with the fixed contact 2B. 3B is separated from the movable contact 4B while being separated from the fixed contact 2B. For this reason, when the contact portion is in the OFF state, the leakage detection device is not energized, and it is possible to prevent the leakage detection device from being destroyed by continuing the state in which the test switch SW is turned on. That is, when the test switch SW is turned on and the contact is opened, no current flows through the leakage detection device, and the leakage detection device is not easily destroyed.
[0076]
The movable contact 4B comprises a leaf spring driven by opening / closing operation of the handle 6, and the connecting member 99 which is one of the connection points of the leakage detecting device is an elastic conductive plate which is displaced in the same direction as the leaf spring. For this reason, when the elastic conductive plate comes into contact with the movable contact 4B, a wiping action works and contact reliability is improved. Further, when the elastic conductive plate comes into contact with the leaf spring, the elastic conductive plate is also displaced in the same direction as the leaf spring, so that the leaf spring is not easily deformed, thereby improving the contact reliability of the contact. If one of the connection points of the leakage detection device is not an elastic conductive plate but a rigid body, the leaf spring is likely to be deformed with the rigid body as a fulcrum.
[0077]
When one movable contact 4B operates the handle, the movable contact 3B contacts the fixed contact 2B before the other movable contact 4A, and the movable contact 3B moves from the fixed contact 2B later than the other movable contact 4A. If the configuration is such that the fixed contact 2B is contacted and separated with a time difference with respect to the opening / closing operation of the other movable contact 4A, the movable contacts 3A and 3B of both the movable contacts 4A and 4B are in contact with the fixed contacts 2A and 2B. If only the movable contact 3b of the first-contact or late-moving movable contact 4B is in contact with the fixed contact 2b before the power is supplied, the power supply is supplied to the leakage detection device, so that quick leakage protection can be performed. Further, the container body 1 is provided with a contact portion 330 that contacts at least the side surface opposite to the movable contact surface of the movable conductive plate of the elastic conductive plate as the connecting member 99 when the handle 6 is turned on. It is possible to increase the spring load when it comes into contact with the power supply, and to ensure the power supply to the leakage detection device even during vibration or impact. On the other hand, an input / output terminal and a contact portion of each pole are arranged along the width direction of the vessel body 1 and a partition wall member 31 which is an intermediate partition wall separating the contact portions of each pole is arranged in the vessel body 1. The partition member 31 holds the elastic conductive plate as the connecting member 99. In this case, a shaft 332 is provided at the lower end portion of the partition wall member 31, an attachment piece 334 that is bent and raised from the side surface is provided at the base end portion of the connection member 99, and an attachment hole 333 is formed in the attachment piece 334. The hole 333 is fitted to the shaft 332 and sandwiched between the lower end surface of the partition wall member 31 and the bottom surface of the first side case 1A of the container 1. As described above, since the elastic conductive plate can be assembled into the container 1 while being held by the partition wall member 31, the assembling work is facilitated. In addition, the elastic conductive plate can be reliably opposed to the movable contact 3B after being assembled, and the power supply to the leakage detection device can be reliably turned on and off.
[0078]
Thus, when assembling the earth leakage breaker of this embodiment, first, the terminal block 10A is housed in the recess 8 of the first side case 1A, and the release handle 17 is assembled together with the return spring 21 at a fixed position. Further, the handle 6 is incorporated in a predetermined position together with a torsion spring. Then, the cross bar 40 is fitted with the movable contact 4A in the cut groove 54, and the coil spring 53 is housed in the recess, and is rotatably arranged with the coil spring 62 at a predetermined position of the first side case 1A. Further, the operation plate 43 is connected to the handle 6 by a link 44.
[0079]
Furthermore, the common terminal T1 is housed in the housing portion 90 provided at the bottom of the other end of the container 1, and the inner side configured when the selection terminal T2 is abutted with the second side case 1B together with the slide member 83. It is stored in the inner compartment of the first side case 1 </ b> A corresponding to the storage unit 200. Further, the leg piece 83a of the slide member 83 is inserted into the slide groove 207 formed on the outer surface of the side wall of the first side case 1A through the insertion hole 208 to expose the protruding portion 206 to the outside.
[0080]
Furthermore, the separation wall 91 formed in the height direction of the first side case 1A along the inner storage portion 200, and in the height direction facing the separation wall 91 at a substantially longitudinal center of the first side case 1A. A first circuit board 73 and a second circuit board 73 attached to the zero-phase current transformer ZCT with the second circuit board 74 having a long longitudinal dimension as the side of the separation wall 91 in the upper part of the space between the formed separation wall 65. 74, and the first and second electromagnetic release devices 47, 48 are housed in the lower part of the space. Here, two ribs 92 are provided along the width direction of the container 1 in the vicinity of the separation wall 91 at the bottom of the first side case 1A, and the fitting formed between the two ribs 92 is provided. By fitting the lower end portion of the second circuit board 74 into the joint groove 92a, the longitudinal direction thereof substantially coincides with the height direction of the first side case 1A, and the axial direction of the zero-phase current transformer ZCT is the first. The second circuit board 74 is positioned and fixed so as to substantially coincide with the longitudinal direction of the side case 1A.
[0081]
In addition, rectangular window holes 98 are opened on the side walls of the opposite cases 1A and 1B facing the zero-phase current transformer ZCT, and the portion with the largest width of the housing 75 is inserted into the window hole 98 as shown in FIG. Thus, the housing 75 is escaped. That is, since the width dimension of the housing 75 of the zero-phase current transformer ZCT is slightly larger than the width dimension of the first and second circuit boards 73 and 74, the width dimension of the container body 1 is adjusted to the width dimension of the housing 75. Although a useless space is generated, by providing the window hole 98 and releasing the housing 75 as described above, it is possible to prevent the useless space from being generated and to reduce the width dimension of the body 1. However, the width dimensions of the housing 75 and the container body 1 are set so that the housing 75 inserted into the window hole 98 does not protrude from the outer side surfaces of the side walls 1A and 1B.
[0082]
On the other hand, as shown in FIG. 4, the first and second electromagnetic release devices 47 and 48 are arranged at the bottom of the first side case 1A at the lower part of the space with the movable iron core 58 in the height direction of the body 1. The zero-phase current transformer ZCT is arranged above the fixed iron core 57 in the height direction of the vessel body 1. The fixed iron core 57 and the movable iron core 58 connected by the leaf spring 59 in this way are arranged at the bottom of the vessel body 1 along the height direction of the vessel body 1, and in the axial direction on top of the fixed iron core 57 and the movable iron core 58. If the zero-phase current transformer ZCT is arranged so that the length of the conductor 1 is substantially coincident with the longitudinal direction of the container 1, the extending direction of the conducting conductor 80 sandwiched between the fixed core 57 and the movable core 58 coincides with the longitudinal direction of the container 1. Since it can be made to arrange | position in the container body 1, the dimension of the height direction of the container body 1 can be reduced in size. Further, by arranging the zero-phase current transformer ZCT at the upper part in the height direction of the fixed iron core 57 and the movable iron core 58, the size in the longitudinal direction of the body 1 can be reduced. Furthermore, since the axial direction of the zero-phase current transformer ZCT coincides with the longitudinal direction of the body 1, it is easy to penetrate the main circuit circuit (braided lines 79A and 79B) through the zero-phase current transformer ZCT. Yes. Alternatively, when the braided wires 79A and 79B are incorporated in the first-side case 1A in a state where the braided wires 79A and 79B are passed through the zero-phase current transformer ZCT in advance, the distance for drawing the braided wires 79A and 79B in the container 1 may be short. In addition, since the movable iron core 58 is disposed on the bottom side of the body 1, the suction operation of the movable iron core 58 is not affected by the zero-phase current transformer ZCT, and the opening characteristics of the main contact described later are stabilized. Can do.
[0083]
Here, the movable contact 4B, the rear end of which is connected to the front end of the outer piece 80b, has a separating wall 65 located at a slightly upwardly inclined portion at the center thereof slightly above the bottom of the first side case 1A. It is arranged between the partition wall 95 extended from the lower end of the first side case 1A toward the other end of the first side case 1A, and further inclined and extended upward from the parallel portion, and the bottom of the first side case 1A. The free contact side of the movable contact 4 </ b> B is disposed in a space where the fixed contact 12 </ b> B is disposed via the notch portion 14 a of the partition wall 14. At this time, the plurality of ribs 96 projecting from the lower surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A are fixed with the rear end portion of the movable contact 4B interposed therebetween. At this time, the connection member 99 connected to the first circuit board 73 and the lead wire 82B is sandwiched and fixed between the bottom of the first side case 1A and the movable contact 4B, and the leakage protection circuit 51 and the test circuit 70 are fixed. Is connected to the circuit of the neutral electrode (or other voltage electrode).
[0084]
Further, the partition member 31 holding the conductive plates 71A and 71B and the bimetals 45 and 46 is accommodated in the space between the separation wall 65 and the partition wall 95. At this time, the partition member 31 is positioned in the space of the body 1 by placing the inclined part inclined obliquely upward of the lower peripheral wall 31 b of the partition member 31 along the inclined part of the partition wall 95. Thus, since the first circuit board 73 is disposed on the side close to the bimetals 45 and 46 in the longitudinal direction of the container 1, the distance between the second circuit board 74 and the bimetals 45 and 46 is increased. Thus, it is possible to suppress the influence of the heat generated by the bimetals 45 and 46 on the weakly weak circuit components, such as an IC (leakage current determination circuit 51a) mounted on the second circuit board 74.
[0085]
Furthermore, the first trip plate 41 is rotatably arranged at a fixed position together with the torsion spring 301, and the second trip plate 42 is rotatably arranged at a fixed position. At this time, the receiving portion 42 c of the second tripping plate 42 faces the distal end portion of the movable iron core 58.
[0086]
In this way, as shown in FIG. 13, the intermediate case 7 and the terminal block 10B housed in the recess 9 of the intermediate case 7, the release handle 17 ′ and its return spring 21 ′ are arranged on the first side case 1A side. After the assembly, the intermediate case 7 in which the terminal block 10B, the release handle 17 ′, and the return spring 21 ′ are assembled in the recess 9 is disposed so as to overlap the first case 1A side.
[0087]
Here, when the intermediate case 7 is disposed at a fixed position on the first side case 1A side, the free end side of the movable contact 4A is disposed in the recess through the opening of the vertical wall and is provided in the terminal block 10A. The distal end side portion of the fixed contact 12 </ b> A is placed on the step surface of the bottom wall and the shaft is fitted into the recess 37 of the release handle 17.
[0088]
On the other hand, the stationary contact 12B provided in the terminal block 10B is placed on the rib 26 on the bottom of the first side case 1A. Further, the lower surface of the downward stepped portion that can be formed at the end of the intermediate case 7 is placed on a flat surface formed on the end wall of the first side case 1A.
[0089]
In this state, the second side case 1B is overlapped and coupled to the first side case 1A side. At this time, the claw-like hooking locking portions 101 at the tips of the elastic locking pieces 100 at the upper and lower ends of the both ends integrally projecting from the first side case 1A to the second side case 1B correspond to the second side case 1B side. The first side case 1A and the second side case 1B are coupled and fixed to the protrusion-like hooked portion 102 provided in this manner to constitute the container 1 (FIGS. 4, 5, and 5). 12 etc.). When the first side case 1A and the second side case 1B are uncoupled and fixed, a driver is inserted into the second side case 1B through the release holes 150 corresponding to the hooked portions 102. The second side case 1 </ b> B can be removed from the first side case 1 </ b> A by pressing the hook locking portion 101 of each elastic locking piece 100 upward to remove the hooked state with the hooked portion 102.
[0090]
By attaching the second side case 1B, the shaft 40a of the cross bar 40 and the shaft portion 41a of the first tripping plate 41 are rotatable in the shaft holes 52 and 56 provided on the inner surface of the second side case 1B. Inserted into.
[0091]
Further, the heads of the adjusting screws 77 and 77 ′ corresponding to the bimetals 45 and 46 face the opening 104 opened on the upper surface of the container body 1 through the notch 31 e of the partition wall member 31, and an operation test after assembly is performed. The operation adjusting screws 77 and 77 ′ are screwed through the opening 104 so that an optimal operating point is sometimes obtained, and the tip of the bimetal 45, the leg 41 c of the first tripping plate 41, and the tip of the bimetal 46. After adjusting the distance between the first part and the drive piece 42d of the second tripping plate 42, the lid 106 is fitted into the peripheral part of the opening 104 of the body 1 by using its elasticity, and the opening 104 is formed. Cover.
[0092]
Here, as shown in FIG. 5, the bimetals 45 and 46 are juxtaposed with the width direction of the container body 1 being held in the partition wall member 31 so as to reduce the size of the container body 1 in the width direction. ing. Further, since the displacement direction is set to be away from the second circuit board 74 and the two electromagnetic release devices 47 and 48 along the longitudinal direction of the body 1, the bimetal 45 and 46 and the electromagnetic release devices 47 and 48 are set. Moreover, the space | interval with zero phase current transformer ZCT (2nd circuit board 74) can be narrowed, and size reduction of the longitudinal direction of the container 1 can be achieved.
[0093]
In addition, since the bimetals 45 and 46 are separated from each other by the partition wall 31a of the partition wall member 31, it is possible to achieve insulation between the bimetals 45 and 46 by the partition wall 31a and to narrow the interval. Further, by arranging the zero-phase current transformer ZCT across the partition wall 31a in the width direction of the body 1, the braided wires 79A and 79B connected to the bimetals 45 and 46 are passed through the zero-phase current transformer ZCT. It is easy. Further, since the two electromagnetic release devices 47 and 48 including the fixed iron core 57 and the movable iron core 58 are also arranged so as to straddle the partition wall 31a in the width direction of the body 1, the width dimensions of the fixed iron core 57 and the movable iron core 58 are set. The time required for opening the main contact can be shortened by increasing the electromagnetic attraction force.
[0094]
Thus, the selection terminal T2 and the common terminal T1 are housed in the inner housing part 200 and the housing part 90 inside the other end of the container body 1, respectively, and one end of the container body 1 corresponds to these terminals T1 and T2. The insertion portions 209a to 209c that are open so as to extend over the end surface and both side surfaces of the container body 1 are formed in the portion. Further, a pair of wire insertion holes 16A and 16B opened obliquely upward are formed in parallel at one end of the vessel body 1.
[0095]
Therefore, the electric wires on the load side are respectively inserted into the electric wire insertion holes 16A and 16B and connected to the terminal blocks 10A and 10B, and the conductive bar of the voltage electrode is inserted into the common terminal T1 in the width direction via the insertion portion 209c. If a neutral conductive bar or another conductive bar is inserted into the selection terminal T2 in the width direction via the insertion part 209a or the insertion part 209b, the leakage breaker of this embodiment is cut off on the electric circuit. Can be inserted.
[0096]
Incidentally, as shown in FIG. 3, a projecting portion 105 through which an insertion hole 105a for inserting the test button 78 is provided is provided in the vicinity of the opening 104 of the second side case 1B, and the test button 78 having a bifurcated tip. Is inserted into the insertion hole 105a from above and the locking step 78a is locked to the periphery of the insertion hole 105a in the body 1 so that the test button 78 is movable in the height direction of the body 1 and is prevented from coming off. Are attached to the projecting platform 105. The tip of the test button 78 is opposed to the movable contact plate 76a of the test switch SW mounted on the second circuit board 74. By pressing the test button 78, the movable contact plate 76a is moved at the tip. The test switch SW can be turned on by being pushed and brought into contact with the fixed contact 76b. The lid 106 is provided with a semicircular cutout 106a through which the test button 78 is inserted in order to avoid interference with the test button 78.
[0097]
Here, as shown in FIG. 12, since the window hole 98 where the housing 75 of the zero-phase current transformer ZCT is partially exposed is opened on both sides of the container 1, the window hole 98 enters the container 1. In order to prevent foreign material from entering and improve the appearance, the insulating sheet 107 formed in the shape of a square tube with an insulating sheet material is attached to the container 1 to cover the window hole 98. Hidden.
[0098]
Next, the operation of this embodiment will be described with reference to FIG. 2 and FIGS. FIG. 13 shows an open state. In this open state, the operation portion 6a of the handle 6 is in an inverted state exposed from the window hole 50, and the engagement state between one end of the operating plate 43 and the first tripping plate 41 is as follows. It is in a disconnected state. The crossbar 40 is urged by the coil spring 62 so as to rotate clockwise in the figure, and the movable contact 4A inserted through the groove 54 of the crossbar 40 moves the free end upward. The movable contact 4B inserted into the kerf 55 is in a state where the free end is moved upward by its spring elastic force, and the movable contacts 3A and 3B provided at the respective free ends are It is in a state separated from the corresponding fixed contacts 2A, 2B.
[0099]
In this state, when the operation portion 6a of the handle 6 is rotated clockwise, the upper shaft 44a of the link 44 is pushed downward, and the link 44 pushes down the operating plate 43 by the lower shaft 44b. When the operating plate 43 is pushed down, one end (right end in the figure) of the operating plate 43 hits the locking portion 41e of the first tripping plate 41, and the operating plate 43 rotates counterclockwise with the position as the center of rotation. The other end (left end) of the operating plate 43 hits the protrusion 84 provided at the upper end of the cross bar 40, and rotates the cross bar 40 counterclockwise against the spring bias.
[0100]
By this rotation, the movable contact 4B inserted into the groove 55 of the cross bar 40 bends in the direction of moving the free end downward, and the free end movable contact 3B is brought into contact with the fixed contact 2B. Further, the movable contact 4A inserted through the kerf 54 rotates counterclockwise to bring the movable contact 3A at its free end into contact with the fixed contact 2A. This contact is delayed from the time when the movable contact 3B contacts the fixed contact 2B, and the movable contact 3B comes first.
[0101]
When the handle 6 is further rotated clockwise, the upper shaft 44a moves to the left as shown in FIG. 2 from the line connecting the position of the lower shaft 44b of the link 44 and the rotation center of the handle 6, and this state Thus, the torsion spring of the handle 6, the coil spring 62 that urges the cross bar 44, and the spring force of the movable contact 4B are balanced so that one end of the operating plate 43 and the locking portion 41e of the first tripping plate 41 are The latch state is maintained, and the input state of FIG. 2 is maintained.
[0102]
Now, when the operating portion 6a of the handle 6 is rotated counterclockwise in the inserted state, the position of the upper shaft 44a of the link 44 crosses the line connecting the rotation center of the handle 6 and the lower shaft 44b to the right. Since it moves upward, the latched state between the left end of the operating plate 43 and the locking portion 41e of the first tripping plate 41 is released, and the crossbar 40 is rotated clockwise by the biasing force of the coil spring 62, and the handle 6 is rapidly returned to the off side by the biasing force of the torsion spring. As the crossbar 40 rotates clockwise, the movable contact 4A rotates clockwise to move the free end upward, and the movable contact 3A is separated from the fixed contact 2A. Further, the movable contact 4B is not pushed downward, and is returned to its original state by its spring force, so that the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is delayed after the movable contact 3A is separated from the fixed contact 2A. This delay is the same during forced opening described later.
[0103]
Here, since the opening and closing of the main contacts of both poles is delayed as described above, the arc generated when the contacts are opened and closed is only the movable contact 4A on the rigid body side, and the arc of the movable contact 3B made of a spring material. It is possible to prevent exhaustion due to.
[0104]
Further, the stoppers 130 formed in both the cases 1A and 1B and the intermediate case 7 are inserted into the concave groove 131 formed in the width direction of the front end surface of the cross bar 40 that rotates when the main contact is opened, and the concave groove 131 is engaged. Because of the contact with the bottom of the container 1, there is no risk that an arc generated in one section will wrap around from the crossbar 40 side on the back side of the container 1 and enter the other section. Prevent short circuit.
[0105]
Now, when an overcurrent flows through the load in the above-described input state shown in FIG. 2, the bimetals 45 and 46 generate heat due to the overcurrent and are displaced in a curved manner. Here, the bimetals 45 and 46 suspended from above are displaced so that their lower ends move leftward in the figure, and as shown in FIG. 15, the lower ends of the bimetals 46 move the drive piece 42d of the second trip plate 42 leftward. The lower end of the bimetal 45 pushes the receiving portion (not shown) at the tip of the leg portion 41c of the first tripping plate 41 in the left direction. Further, the displacement of the bimetal 46 causes the second trip plate 42 to rotate counterclockwise, and the facing portion 42a of the second trip plate 42 pushes the receiving portion 41f of the first trip plate 41 leftward. The first tripping plate 41 rotates clockwise when the receiving portion is pushed by the bimetal 45 and the receiving portion 41f is pushed by the second tripping plate.
[0106]
When the first tripping plate 41 rotates clockwise, the latched state between the locking portion 41e and one end (right end) of the operating plate 43 is released, and the operating plate 43 is centered on the lower shaft 44b of the link 44. It will rotate clockwise. Therefore, the restriction of the cross bar 40 by the other end (left end) of the operating plate 43 is eliminated, and the cross bar 40 is rotated clockwise by the spring force of the coil spring 62, and the movable contacts 4A and 4B are moved as shown in FIG. Returning to the open state, the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B, respectively. That is, when an overload current flows through the main circuit, the opening / closing mechanism 5 is released by the thermal release devices 47 and 48 to forcibly open the main contact to protect the load.
[0107]
Thereafter, the bimetals 45 and 46 return to their original state due to the interruption of the electric circuit, and the first tripping plate 41 returns to its original position by the urging of the torsion spring, and at the same time, the opposing portion 42a of the second tripping plate 42 is moved. The receiving portion 41f pushes and moves the second tripping plate 42 back. Further, the handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.
[0108]
Further, in the above-described state, when an excessive current such as a short-circuit current flows through the conducting conductor 80, an electromagnetic attractive force is generated in the fixed iron core 57, and the movable iron core 58 is attracted and swung. Further, the magnetic plate 340 is attracted to the yoke 341. Thereby, as shown in FIG. 12, the tip of the movable iron core 58 pushes the receiving portion 42c of the second tripping plate 42 to rotate the second tripping plate 42 counterclockwise. When the second trip plate 42 rotates counterclockwise in the same manner as when an overload current flows, the opposing portion 42a of the second trip plate 42 moves the receiving portion 41f of the first trip plate 41 leftward. Push to turn clockwise. The first tripping plate 41 also receives rotational force in the clockwise direction when the magnetic plate 340 is attracted to the yoke 341. When the first tripping plate 41 rotates clockwise, the latched state between the locking portion 41e and one end (right end) of the operating plate 43 is released, and the operating plate 43 is centered on the lower shaft 44b of the link 44. Will rotate clockwise. Therefore, there is no restriction of the cross bar 40 by the other end (left end) of the operating plate 43, the cross bar 40 is rotated clockwise by the spring force of the coil spring 62, and the movable contacts 4A and 4B are returned to the open state. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an overcurrent (instantaneous large current) such as a short circuit current flows through the main circuit, the first electromagnetic release device 47, the third electromagnetic release composed of the magnetic plate 340, the bimetal 45, and the yoke 341. The opening / closing mechanism 5 is released by the device, and the main contact can be forcibly opened.
[0109]
Thereafter, when the electromagnetic attractive force is not generated in the fixed iron core 57 due to the interruption of the electric circuit, the movable iron core 58 returns to the original state by the spring force of the leaf spring 59, and the first tripping plate 41 is restored to the original state by the bias of the torsion spring. At the same time, it returns to the position, and at the same time, the receiving portion 41f pushes and moves the facing portion 42a of the second tripping plate 42 to return the second tripping plate 42 to its original position. Further, the handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.
[0110]
Furthermore, when a leakage current such as a ground fault current flows in the above-described state, the leakage protection circuit 51 energizes the coil 68 to generate an electromagnetic attraction force on the fixed core 57, thereby attracting and swinging the movable core 58. Let As in this case, as shown in FIG. 16, the tip of the movable iron core 58 pushes the receiving portion 42c of the second tripping plate 42 to rotate the second tripping plate 42 counterclockwise, as in the case where a short-circuit current flows. At the same time, the first tripping plate 41 is rotated clockwise to return the movable contacts 4A and 4B to the open state, thereby separating the movable contacts 3A and 3B from the fixed contacts 2A and 2B, respectively. That is, when a leakage current such as a ground fault current flows in the main circuit, the opening / closing mechanism 5 is released by the second electromagnetic release device 48 constituting the leakage trip means and the main contact is forcibly opened. And ground fault protection.
[0111]
【The invention's effect】
According to the earth leakage breaker of the first aspect, the space in the height direction of the circuit board can be effectively utilized, and the device body can be made particularly compact in the height direction.
[0112]
  AlsoIn contrast to the case where the earth leakage test fixed contact is directly attached to the end face of the circuit board, the earth leakage test movable plate can be sufficiently separated from the earth leakage test fixed contact even if it is close to the end face of the circuit board. The space in the direction between the lower surfaces can be narrowed, and the body can be made compact.
[0113]
  Claim2According to the earth leakage breaker described, the claim1In addition to the same effect as above, since the earth leakage test fixed contact is in the dent on the end face of the board, the earth leakage test movable plate is brought into contact with the earth leakage test fixed contact against the one in which the tip of the earth leakage test movable plate is formed straight. This makes it easy to ensure the contact between the earth leakage test movable plate and the earth leakage test fixed contact, and makes it difficult for the earth leakage test movable plate to contact the end face of the circuit board.
[0114]
  Claim3According to the earth leakage breaker describedClaim 1 or claim 2In addition to the same effect as above, the end face of the earth leakage test movable plate is brought into contact with the circuit board, and the earth leakage test movable plate contacts the earth leakage test fixed contact with this point as a fulcrum, so that the earth leakage test movable plate can be easily made elastic. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view around a zero-phase current transformer according to an embodiment of the present invention.
FIG. 2 is a side view showing a charging state of the embodiment, with a second side case removed.
FIG. 3 is an exploded perspective view of the above.
FIG. 4 is a longitudinal sectional view in the vicinity of a zero-phase current transformer.
FIG. 5 is a longitudinal sectional view of a bimetal position.
FIG. 6 is an exploded perspective view of the first and second electromagnetic release devices of the above.
FIG. 7 is a perspective view of the first and second electromagnetic release devices according to the embodiment.
FIG. 8 is a circuit diagram of a leakage protection circuit and a test circuit in the same as above.
FIG. 9 is an exploded perspective view including an insulating plate around the zero-phase current transformer.
FIG. 10 is a front view of a circuit board.
FIG. 11 is a perspective view of a partition member.
FIG. 12 is a perspective view of an earth leakage circuit breaker.
FIG. 13 is a side view showing the opened state, with the second side case removed.
FIG. 14 is a side view showing a state in which one movable contact is inserted in the middle of turning the handle from the open state to the closed state, and the second side case is removed.
FIG. 15 is a state explanatory diagram of an overcurrent tripping operation due to an overload current as described above.
FIG. 16 is a state explanatory diagram of an overcurrent tripping operation due to a short-circuit current and a leakage tripping operation due to a ground fault current.
[Explanation of symbols]
1 body
2A, 2B fixed contact
3A, 3B movable contact
5 Opening and closing mechanism
6 Handle
41 First trip plate
42 Second trip plate
47 First electromagnetic release device
48 Second electromagnetic release device
51 Leakage protection circuit (leakage detection circuit)
57 Fixed iron core
58 Movable iron core
68 Trip coil
69 Coil frame
69b Holding piece
69c Mounting pin
73 Circuit board
74 Circuit board
76a Movable contact plate (leakage test movable plate)
76b Earth leakage test fixed contact
78 Earth leakage test button
326 dent
329 Test movable plate tip
360 Opposite end of movable test plate
ZCT Zero-phase current transformer

Claims (3)

A handle that can be operated from the upper surface of the vessel, a multi-pole contact that is opened and closed by turning the handle, a zero-phase current transformer that detects an unbalanced current between the poles, and an upper surface of the vessel The installed earth leakage test button, the earth leakage test movable plate driven by the operation of the earth leakage test button, and the earth leakage test fixing that causes a pseudo-unbalanced current to flow through the zero-phase current transformer when the earth leakage test movable plate comes in contact with and separates A leakage detecting circuit is mounted for supplying an exciting current to the trip coil for forcibly opening the contact of each pole when the unbalanced current is detected by the zero-phase current transformer. In the earth leakage circuit breaker comprising the circuit board disposed in such a manner that both end faces face the upper and lower surfaces of the container body,
The earth leakage test movable plate is disposed on an end surface side of the circuit board located on the upper surface side of the device body, and a recess is provided on an end surface of the circuit board located on the upper surface side of the device body to fix the earth leakage test. An earth leakage circuit breaker characterized in that a contact is disposed in the recess . Earth leakage breaker according to claim 1, wherein the bent tip of the test movable plate to the fixed contact direction. The earth leakage circuit breaker according to claim 1 or 2 , wherein an end face opposite to a contact end face of the earth leakage test fixed contact of the earth leakage test movable plate is bent so as to contact the circuit board.

Images