JP4407380B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker used for a branch switch of a residential distribution board, and more particularly to a circuit breaker suitable for use in a branch circuit of a single-phase three-wire indoor wiring.

  In conventional residential distribution boards (hereinafter referred to as “residential boards”), even if power is received from a power company using a single-phase, three-wire system that uses both 100V and 200V, indoor wiring to outlets, etc. is not regulated (electrical equipment). According to technical standards and interpretation, only a single-phase two-wire system of one voltage side electrode and a neutral electrode was recognized at 100V, and two voltage side electrodes at 200V. Therefore, two voltage-side electrode conductive bars and a neutral electrode conductive bar are juxtaposed in the front-rear direction in the housing panel, and for the 100V branch circuit, one of the voltage-side electrode conductive bar and the neutral electrode conductive bar. A branch switch was connected to the two, and for the 200V branch circuit, the branch switch was connected to the conductive bars of the two voltage side electrodes (see Patent Document 1).

As a branch switch for single-phase two-wire indoor wiring as described above, a two-pole circuit breaker as disclosed in Patent Document 2 is generally used. The two-pole type circuit breaker disclosed in Patent Document 2 has three insertion portions into which three conductive bars are respectively inserted in parallel in the front-rear direction at the end of the vessel body. Any two of the conductive bars are inserted and connected to the blade receiving terminal provided in the body through any two of the insertion portions.
JP 2001-157321 A JP 2001-35341 A

  By the way, in recent years, electric water heaters, air conditioners, electromagnetic cookers, clothes dryers and the like have become widespread as 200 V electric devices, and these 200 V devices are installed in kitchens where 100 V wiring is performed. In this case, it is necessary to separately wire a dedicated 200V single-phase two-wire wiring from the housing board according to the regulation of the above law. Thus, when 100V and 200V are separately wired, the number of branch circuits increases as the number of devices for 200V increases, and the size of the housing panel must be increased.

  On the other hand, the above-mentioned regulations were revised, and the restrictions on branch circuit facilities for single-phase three-wire indoor wiring were relaxed, and single-phase three-wire wiring can now be used for indoor wiring. However, the branch switch for single-phase three-wire indoor wiring naturally requires a three-pole circuit breaker, but so far it has been used for branch switches for single-phase three-wire indoor wiring in addition to the main switch. There is no three-pole type circuit breaker that can be developed, and it takes a lot of cost and time to newly develop and manufacture the circuit breaker.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a three-pole circuit breaker that can be manufactured at low cost while reducing the cost and time required for development and manufacturing. .

  In order to achieve the above object, the invention of claim 1 is a circuit breaker used for a branch switch of a residential distribution board, and branches a pair of voltage side poles in a single-phase three-wire wiring path. It is composed of a voltage side pole block and a neutral pole block that branches off the neutral pole. The voltage side pole block and the neutral pole block are each a flat box shape made of an insulating material, and have substantially the same shape and dimensions. The three insertion parts into which three conductive bars of two voltage side poles and neutral poles are respectively inserted at one end side in the longitudinal direction of each container are orthogonal to the longitudinal direction. Two electric wire insertion holes are arranged in parallel along the short side direction of the device body, and are arranged in a line along the front-rear direction and into which the electric wire for branching can be inserted on the other end side in the longitudinal direction of each device body. The voltage side pole block is provided in the body, and the voltage side The two blade receiving terminals into which the conductive bars are inserted and connected, the two terminal portions respectively connecting the electric wires inserted from the two electric wire insertion holes, and the two blade receiving terminals and the two terminal portions, respectively. Two contact points inserted into a conductive path provided independently, an open / close mechanism for opening and closing the two contact points, and a tripping device for releasing the open / close mechanism to open the two contact points are housed in the container. A handle for operating the opening / closing mechanism to open the two contacts when operated manually is pivotally provided on the front of the device, and the neutral pole block is provided inside the device and is inserted through the insertion part. Provided between the blade receiving terminal and the terminal portion, one blade receiving terminal to which the conductive bar of the conductive electrode is inserted and connected, one terminal portion for connecting the electric wire inserted from any one of the wire insertion holes, and One contact to be inserted into the conductive path and opening and closing the contact The opening and closing mechanism is housed in the container, and a handle for operating the opening and closing mechanism and opening the contact when operated manually is provided on the front surface of the container so as to be rotatable. And means for connecting the body of the neutral pole block and the insertion part and the wire insertion hole along the short direction, and two wire insertion holes provided in the body of the neutral pole block And a hole closing member that closes the electric wire insertion hole that is not connected to the terminal portion.

  According to the present invention, a conventional two-pole circuit breaker is used as a voltage side pole block, and a tripping device, a contact of one pole, a terminal portion, etc. are removed from the conventional two-pole circuit breaker. Is used for the neutral pole block, and one of the two wire insertion holes in the neutral pole block that is not used is blocked with a hole closing member to prevent erroneous connection of the wires. A 3-pole type circuit breaker can be realized by connecting the body of a voltage side pole block and a neutral pole block composed of a 2-pole type circuit breaker by connecting means together. Compared to a case where a circuit breaker is newly developed, a cost and time burden required for development and manufacturing can be suppressed, and an inexpensive three-pole circuit breaker can be provided. In addition, when the contacts of the two voltage side poles are divided and arranged in the two containers connected by the connecting means, the tripping operation is performed in the other instrument with respect to the tripping operation in one instrument. In order to achieve this, a mechanism for interlocking each other's opening / closing mechanism is required. However, since the two voltage side electrodes are housed in one container to form a voltage side electrode block, the above-described interlocking mechanism is not necessary and the number of parts is reduced. There is an advantage that the reduction of the configuration and the simplification of the configuration can be achieved.

  According to a second aspect of the invention, in the first aspect of the invention, the neutral pole block is configured such that the electric wire inserted from the electric wire insertion hole closer to the voltage side polar block among the two electric wire insertion holes is connected to the terminal portion. In addition, the electric wire insertion hole on the side far from the voltage side pole block is closed with a hole closing member.

  According to the present invention, since all the three electric wire insertion holes are arranged close to each other, even when a three-core cable is used for indoor wiring, the distance between the three electric wires is substantially the same, and there is an excess in the cable. It can be wired nicely without burden.

  According to a third aspect of the invention, in the first or second aspect of the invention, the neutral pole block is provided with a handle operation prohibiting member for prohibiting the handle from being operated in a direction to open the contact by operating the opening / closing mechanism. It is characterized by.

  According to this invention, it can prevent that the handle | steering-wheel of a neutral pole block is inadvertently operated and will be in the phase loss state of a neutral wire.

  The invention of claim 4 is the invention according to claim 3, which is arranged in the vicinity of the three wire insertion holes on the front surface of the two connected vessel bodies, and the correspondence relationship between each wire insertion hole, the voltage side electrode and the neutral electrode. The display member for displaying is provided integrally with the handle operation prohibiting member.

  According to the present invention, it is clear by the display member which electric wire of the two voltage side electrodes of the branch circuit and one electric wire of the neutral electrode should be inserted into which electric wire insertion hole of each block. It can be distinguished from the indoor wiring errors.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, a concave portion for housing the handle in a state where the contact is inserted is provided on the front surface of the neutral pole block, and the handle operation prohibiting member has a concave portion. It is characterized by comprising a cover that makes it impossible to operate the handle housed in the recess by covering from the front.

  According to this invention, when the contact is turned on, the handle is housed in the concave portion on the front surface of the body, and the handle operation prohibiting member is configured by the cover that covers the concave portion containing the handle from the front surface. The structure of the forbidden member can be simplified and the appearance is improved.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the cover is pivotally attached to the container body between a position covering the recess and a position not covering, and is locked to the container at a position covering the recess. It has the latching | locking part which is characterized by the above-mentioned.

  According to the present invention, if the locking portion is unlocked and the cover is rotated to a position where the recess is not covered, it is necessary to open the contact of the neutral electrode as in the case of performing the insulation resistance test of the branch circuit. In some cases, the neutral pole block contacts can be opened by manipulating the handle, and there is no risk of the cover being lost because it is not necessary to completely remove the cover from the body.

  According to a seventh aspect of the invention, in the sixth aspect of the invention, the cover is provided with an opening into which the handle protruding from the concave portion is inserted with the contact open, and the concave portion is covered at a portion other than the cover opening. It is characterized by.

  According to this invention, the handle inserted into the opening of the cover is locked at a position where the operation is restricted by the portion of the cover excluding the opening covering the recess and the neutral contact is opened. Easy circuit insulation resistance test.

  According to the present invention, a conventional two-pole type circuit breaker is used as a voltage side pole block, and a tripping device, a contact point of one pole, a terminal portion, etc. are removed from the conventional two-pole type circuit breaker. Is used for the neutral pole block, and one of the two wire insertion holes in the neutral pole block that is not used is blocked with a hole closing member to prevent erroneous connection of the wires. A 3-pole type circuit breaker can be realized by connecting the body of a voltage side pole block and a neutral pole block composed of a 2-pole type circuit breaker by connecting means together. As compared with a case where a circuit breaker is newly developed, there is an effect that it is possible to provide an inexpensive three-pole type circuit breaker while suppressing the cost and time required for development and manufacturing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. However, the front-rear, left-right, and up-down directions in the circuit breaker of the present embodiment are defined in the directions shown in FIG. 1 unless otherwise specified.

  As shown in FIGS. 1 and 2, the circuit breaker of the present embodiment includes a voltage side pole block SB1 that branches a pair of voltage side poles in a single-phase three-wire wiring path, and a neutral pole that branches a neutral pole. The block SB2 is configured by connecting each container 1 with a connecting member 170 such as a double-sided tape. The container 1 of these two blocks SB1 and SB2 has a flat box shape made of an insulating material, and is formed in substantially the same shape and size as each other except for the presence or absence of the through hole 201 at the front upper end as will be described later. Yes. As shown in FIG. 13, three conductive bars L1 to L3 of a neutral pole and two voltage side poles are respectively inserted into the side surface of one end side (upper end side) in the longitudinal direction (vertical direction) of each container 1. The three insertion portions 209a to 209c are arranged in a line along the front-rear direction orthogonal to the longitudinal direction, and a branching wire can be inserted into the other end side (lower end side) of the longitudinal direction of each container 1 Two electric wire insertion holes 16A and 16B are arranged side by side along the short direction (left-right direction) of the body 1.

  The voltage side pole block SB1 has the same configuration as the two-pole type circuit breaker disclosed in Patent Document 2, and is provided in the container 1 as shown in FIGS. The voltage-side electrode conductive bars L2 and L3 connect the two blade receiving terminals T1 and T2 inserted and connected through the insertion portions 209b and 209c, respectively, and the electric wires inserted from the two electric wire insertion holes 16A and 16B, respectively. Two contact points (movable with fixed contact 2A and movable contact point 2A) are inserted into two terminal portions 10A, 10B, two blade receiving terminals T1, T2 and conductive paths provided independently between the two terminal portions 10A, 10B. An opening / closing mechanism 5 that opens and closes (contacts and separates) the contact 3A, the fixed contact 2B, and the movable contact 3B), and a tripping device that releases the opening / closing mechanism 5 to open the two contacts 2A and 3A and 2B and 3B 1 and 2 Electromagnetic release devices 47A and 47B and a thermal release device) are housed in the body 1, and when operated manually, the handle 6 is operated on the front surface of the body 1 to open the two contacts by operating the opening / closing mechanism 5. It is provided freely.

  The container 1 is formed by connecting a first side case 1A and a second side case 1B made of synthetic resin, and two fixed contacts 2A and 2B are arranged in parallel in the width direction (left and right direction) and fixed to the tip. The two movable contacts 4A and 4B driven by the opening / closing mechanism 5 are accommodated in the movable contacts 3A and 3B, which are opposed to the fixed contacts 2A and 2B, respectively.

  An intermediate case 7 made of a synthetic resin molded product is fixed in the lower end portion of the container 1 so as to be sandwiched between both side cases 1A and 1B, and a recess 8 inside the side wall (outer wall) of the first side case 1A A terminal portion 10A that is electrically connected to one fixed contact 2A is accommodated in a section formed by the vertical wall portion 35 of the intermediate case 7, and the concave portion 9 provided on the second side case 1B side of the intermediate case 7 and the second side A terminal portion 10B that is electrically connected to the other fixed contact 2B is housed in a section formed by the side wall (outer wall) of the case 1B.

  The terminal portion 10A has a terminal plate 11 bent in a U-shape and an extension piece 11a extending forward from one end of the rear piece of the terminal plate 11, and is perpendicular to the extension piece 11a from the front end of 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 one front surface of the fixed contact 12A, and a rear 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 rear piece of the terminal plate 11 is placed on the rearwardly inclined bottom 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 front end, and is integrally formed between the rising wall 8a and the partition wall 14 rising from the bottom of the first case 1A in the same manner as the bottom of the recess 8. The terminal portion 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 for allowing the rear end of the fixed contact 2A protruding to the rear surface side of the fixed contact 12A to escape. The terminal plate 11 is integrally formed with a T-shaped piece 11b extending forward from the other end of the front piece, and the one end of the side protruding portion of the front end of the T-shaped piece 11b is formed on the inner surface of the first side case 1A. It is placed on the front 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.

  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. Inserted from the outside through an oblique rearward electric wire insertion hole 16A formed by an oblique rearward groove 160 having a semicircular cross section and an oblique rearward groove 160 having a similar shape on the wall formed on the opposite wall surface of the intermediate case 7. The core wire of the electric wire (not shown) is press-fitted between the front piece of the terminal plate 11, the front end of the lock piece 13a of the lock spring 13A, and the front end of the holding piece 13b, and the end of the lock piece 13a The core wire is locked with respect to the pulling direction, and the core wire is pressed against the front piece of the terminal plate 11 at the front end face of the pressing piece 13b, whereby the core wire is electrically connected and mechanically held. Yes. The wire lock is released by a release handle 17, and the release handle 17 has a rotary shaft 18 provided on the rear side surface thereof rotated in a shaft hole 20 provided on the convex flat portion 22 on the inner side surface of the first side case 1A. A shaft (not shown) that is freely pivoted 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 side surface of the rear portion. By manually operating and rotating the operating portion 17a exposed to the outside, the driving projection 19 provided at the rear end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to lock the locking piece 13a. Can be released and the lock on the core wire can be released. In FIG. 6, reference numeral 21 denotes a return spring that constantly urges the release handle 17 to rotate in the anti-manual operation direction.

  On the other hand, the terminal portion 10B is basically composed of a terminal plate 11, a lock spring 13B, and a stationary contact 12B as in the case of the terminal portion 10A. However, unlike the terminal plate 11 of the terminal portion 10A, the terminal portion 10B The terminal plate 11 of the portion 10B has an extension piece 11c extending rearward from one end of the rear piece, and a fixed contact 12B extending from the distal end of the extension piece 11c so as to be parallel to the bottom of the body 1. A back piece 11d extending perpendicularly from one end of the side piece of the terminal board 11 is formed.

  The lock spring 13B has the same structure as the lock spring 13A, is placed on the rear 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.

  The terminal portion 10B constitutes the bottom portion of the recess 9 of the intermediate case 7 and places the rear piece of the terminal plate 11 on the lateral wall portion 24 formed to extend substantially in 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 rear end of the vertical wall 25 and one end of the horizontal wall 24, thereby extending the extension piece 11c. When the intermediate case 7 is overlaid on the first side case 1A side, the front portion of the fixed contact 12B, that is, the rear surface provided with the fixed contact 2B is the first side case 1A. It is placed on the ribs 26, 26 at the bottom. 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.

  Further, the front end surface of the protruding flat portion 22 ′ formed on the wall surface of the intermediate case 7 is the front end of the side protruding portion at the front end of the T-shaped piece 11 b formed to extend forward from the other end portion of the front piece of the terminal plate 11. Placed on.

  The locking spring 13B and the terminal plate 11 of the terminal portion 10B constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal portion 10A, and when the intermediate case 7 is superimposed on the second side case 1B, the intermediate case 7 is provided on the vertical wall at the other end portion of the second side case 1B in the same manner as the oblique rearward groove 160 having a semicircular cross section provided on the vertical wall portion at the other end portion of the concave portion 9. When an electric wire is inserted through the electric wire insertion hole 16B formed by the diagonally backward groove 160, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is fixed to the front piece of the terminal plate 11 by the pressing piece 13b. The wires are pressed to electrically connect the wires and are mechanically locked.

  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 rear 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 operation portion 17a exposed to the outside is manually operated and rotated, the drive projection 19 provided at the rear end pushes the front end of one side end of the lock piece 13a of the lock spring 13B so that the lock piece 13a is moved. The locked state can be released by bending. In FIG. 6, reference numeral 21 'denotes a return spring that constantly urges the release handle 17' to rotate in the anti-manual operation direction.

  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 rear 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 side case 1A side. Then, when the intermediate case 7 is butted against the first side case 1A side, the distal end side portion of the stationary contact 12A of the terminal portion 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 rear 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 39 for inserting the free end of the movable contact 4A corresponding to the fixed contact 2A into the recess.

  On the other hand, inside the other end of the container body 1 in the longitudinal direction, the last voltage electrode of the three conductive bars L1 to L3 arranged in parallel in the front-rear direction in the housing board W as shown in FIG. A storage portion 90 for storing and arranging one blade receiving terminal T1 for inserting and connecting the conductive bar L3 and a neutral bar L1 at the foremost stage or a conductive bar L2 for another voltage pole at the middle stage are selected and inserted. An inner storage portion 200 is provided in which one blade receiving terminal T2 to be connected is movably disposed between at least two positions corresponding to the conductive bars L1 and L2 of the neutral electrode and other voltage electrodes. That is, in the circuit breaker used for this voltage side electrode block SB1, 100 V is distributed if one blade receiving terminal T2 is connected to the conductive bar L1 of the neutral electrode, and 200 V is distributed if connected to the conductive bar L2 of the other voltage electrode. It is a so-called 100V / 200V combined type that can selectively correspond to the voltage.

  The two blade receiving terminals T1 and T2 are both substantially U-shaped, and are constituted by blade receiving springs that expand toward the tip after the tip portions of both side pieces parallel to the front and rear are close to each other. , L3 can be easily inserted, and the conductive bars L2, L3 are sandwiched between the central adjacent portions.

  The inner storage portion 200 has an inner side of the first side case 1A as positioning means for positioning the blade receiving terminal T2 at two positions respectively corresponding to the two conductive bars L1 and L2 of the neutral electrode and the voltage 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.

  Display means for displaying on the wall corresponding to the ceiling portion of the inner storage portion 200 of the container 1 whether the blade receiving terminal T2 is located at a position corresponding to the neutral bar or the conductive bar L1, L2 of the voltage electrode. As shown, a through hole 201 communicating with the inside of the inner storage portion 200 is provided, and a columnar display portion 202 formed on the front portion of the slide member 83 that stores the blade receiving terminal T2 from the through hole 201 faces the through hole 201. Thus, the position of the blade receiving 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. In addition, the slide member 83 can be pushed backward from the outside via the through hole 201 to be moved backward. The through hole 201 is a circular hole formed by abutting a semicircular cutout hole 201a provided on the front side wall of the case 1A or 1B.

  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 blade receiving terminal T2 is inserted from one end opening. The tip of the blade receiving spring protrudes from the other end opening, and the blade receiving terminal T2 moves in the front and rear direction (vertical direction in FIG. 7) in the inner storage portion 200 together with the slide member 83. Arranged freely.

  A guide groove in the front-rear 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, 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. In addition, the blade receiving terminal T2 is housed and held so as to be slidable in the front-rear direction.

  The slide member 83 is integrally formed with a leg piece 83a extending rearward from the side portion of the first side case 1A, and a protruding portion 206 protruding outward is formed at the rear end portion of the leg piece 83a. .

  This protrusion 206 is formed on the bottom of the upper end of a slide groove (not shown) formed in the forward direction from the bottom 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 part 200. It is inserted into the slide groove from an insertion hole (not shown) opened so as to communicate with the inner storage portion 200 and is slidable in the slide groove along with the leg piece 83a in the front-rear direction.

  The slide groove and the insertion hole constitute a guide part for moving the slide member 83 mounted with the blade receiving terminal T2 back and forth, and the bottom part of the slide groove is formed so as to protrude into the inner storage part 200. The back surface of the leg piece 83a inserted forward into the slide groove through the insertion hole formed at the bottom end of the groove is configured to be slidable in contact with the bottom of the slide groove. In addition, a protrusion (not shown) is provided at the forefront of the slide groove so that the protrusion 206 abuts when the slide groove moves to the front end.

  Thus, the projecting portion 206 constitutes an operating portion for moving the blade receiving terminal T2 in the inner storage portion 200 back and forth, and the projecting portion 206 is held from the outside of the container 1 or pushed forward by a driver or the like. If the slide member 83 is slid in the slide groove by pushing it down, the slide member 83 in the inner storage portion 200 is moved forward or backward by the guide by the slide protrusion 203 and the guide groove 204 together with the blade receiving terminal T2 along with the slide movement. Will be moved to.

  When the slide member 83 is moved by the above operation, the front end or the rear end of the slide member 83 gets over the positioning projection 97 by its elasticity and the rounded surface of the positioning projection 97. After the movement, the frame portion 83 is placed on the positioning projection 97. The position of the selection terminal T2 is held by hitting the rear end or front end of the front end. However, in the present embodiment, since the two blade receiving terminals T1, T2 are plugged into the voltage electrode conductive bars L3, L2, respectively, the blade receiving terminal T2 corresponds to the voltage electrode conductive bar L2 (middle stage). (See FIG. 7).

  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 an abnormal large current flows due to a ground fault or short circuit accident in the closed state of one contact (the fixed contact 2A and the movable contact 3A), the other contact (the fixed contact 2B) is caused by the first electromagnetic release device 47A. In the closed state of the movable contact 3B), if an abnormal large current flows due to a ground fault or a short circuit accident, the second electromagnetic release device 47B causes thermal motion if an overcurrent such as an overload current flows. The release devices release the open / close mechanisms 5 to forcibly open the contacts.

  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 recess 50 is formed so as to be able to move forward and backward. A torsion spring 36 is attached to the handle shaft 6c, and the handle 6 is urged by the torsion spring 36 in the opening operation direction at the closing operation position.

  A front shaft 44 a of a U-shaped link 44 is rotatably inserted into a shaft hole 6 d provided at the rear end of the rotating portion 6 b and is connected to the operation plate 43 via the U-shaped link 44.

  The actuating plate 43 is connected to the handle 6 via the U-shaped link 44 by inserting the rear shaft 44b of the U-shaped link 44 through bearing holes 43a provided on both sides of the center, and moves back and forth in the body 1. Arranged freely.

  The crossbar 40 is inserted between shaft holes 52 and 52 formed on the inner side surfaces of both side cases 1A and 1B with shafts 40a projecting on both side surfaces of the front part, and is pivotally supported between both side cases 1A and 1B. A cut groove 54 for fitting the side portion of the movable contact 4A from the lateral direction is formed in the side portion of the first side case 1A slightly behind the shaft 40a, and the rear side second case 1B side as shown in FIG. A cut groove 55 for fitting the movable contact 4B from the lateral direction is provided on each side portion. 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 groove 131 is formed in the width direction (left-right direction).

  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 at the top of the recess (not shown) provided above the cut groove 54, The upper part is biased forward by a coil spring 53 for contact pressure that is compressed between the rear 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.

  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 pushed backward to bend, 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.

  The rear end portion of the cross bar 40 is pushed by a coil spring 62 that is compressed between the rear end portion and a wall 63 suspended from the bottom portion of the first side case 1 </ b> A, so that a rotational force is applied. .

  The first tripping plate 41 is a side piece having a shaft portion 41a, a projecting portion 41b projecting from the front portion of the shaft portion 41a, and a surface orthogonal to the shaft portion 41a closer to the second side case 1B side of the shaft portion 41a. Part 41c and an arm piece 41d integrally extending from one end to the front end of the side piece part 41c. Both ends of the shaft part 41a are inserted into shaft holes 56, 56 provided on the inner side surfaces of both cases 1A, 1B. In addition, it is rotatably supported between the cases 1A and 1B. A locking portion 41e on which one end (right end in FIG. 7) of the operating plate 43 is engaged and disengaged is provided at the front end portion of the projecting portion 41b, and the arm. A receiving portion 88 that is pushed and driven by the movable iron core 58A of the first electromagnetic release device 47A is formed at the front end of the piece 41d. A receiving portion 41f that is pushed and moved by a facing portion 42a provided on the end surface of the rear end portion of the second tripping plate 42 is formed on the side surface of the second side case 1B at the rear portion of the side piece portion 41c. On the side surface, there is provided a locking portion 41i for locking both ends of a torsion spring 81 for fitting the ring portion to the shaft portion 41a. Further, the side surface of the first side case 1A at the rear portion of the side piece portion 41c is opposed to the rear end of the bimetal 45 suspended from the conductive plate 71 that fixes and holds the first electromagnetic release device 47A. A first drive unit 41g to be pushed is provided.

  The second tripping plate 42 is provided in the central portion of the end surface of the separation wall 65 integrally formed on the inner side surface of the first side case 1A from the vicinity of the front side of the first side case 1A to the vicinity of the bottom portion in the central hole 42b. Since the shaft 66 is inserted and pivotally supported between the two cases 1A and 1B, the rear end surface on the opposite side of the facing portion 42a is attached to the movable iron core 58A of the first electromagnetic release device 47A. A receiving portion 42c to be pushed is provided. Further, the side surface on the first case 1A side of the front end of the second tripping plate 42 is opposed to the front end of the bimetal 46 suspended from the rear end portion of the movable contact 4B that holds the second electromagnetic release device 47B. In addition, a second drive portion 42d that is pushed when the bimetal 46 is bent is provided.

  The conductive plate 71 made of a thin metal material is formed by being bent in an inverted L shape, and the first electromagnetic release device 47A is firmly held on the outer piece 71a, and is folded back in a U shape from the tip of the outer piece 71a. The bimetal 45 is suspended by welding and fixing the horizontal piece of the upper L-shaped portion of the upper end of the bimetal 45 to the step surface at the lower end of the inner piece 71b parallel to the piece 71a.

  The first electromagnetic release device 47A includes a fixed iron core 57A, a movable iron core 58A, and a movable iron core 58A that are bent in a reverse L shape and bent at both ends of the vertical piece at a right angle so that the horizontal cross section becomes a U-shape. The flat plate 57c is formed of a horizontal piece integrally formed at right angles to the fixed iron core 57A. The fixed iron core 57A is inserted between the piece 71b and the inverted T-shaped piece 71d suspended from the center of both side edges of the outer piece 71a is engaged with the notch groove 57d at the center of both sides of the flat plate 57c. Is held by the conductive plate 71.

  The movable iron core 58A protrudes from the surface of the fixed iron core 57A, and the protrusions 58a and 58a are inserted into holes 59b and 59b formed at the front end portion of the central piece 59a of the leaf spring 59A and fixed by caulking to the leaf spring 59A. The leaf spring 59A is movably supported, and 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 57A. The locking pieces 59d and 59d that protrude inwardly at the tips of the cores are locked to the recesses 57b and 57b formed at the outer corners of the fixed iron core 57A, so that the fixed iron core 57A holds them.

  The magnetic pole surface that is the tip of both side pieces 57a, 57a of the fixed iron core 57A faces the movable iron core 58A through the center piece 59a of the leaf spring 59A and the both side pieces 59c, 59c. When an abnormal large current, such as a short-circuit current, flows through the bimetal 45, which is a conducting conductor, the movable iron core 58A is attracted and oscillated by the magnetic force generated on the magnetic pole surfaces of the both side pieces 57a and 57a of the fixed iron core 57A. The drive part 58b projected from the one side end face is moved.

  The adjusting screw 77 is screwed into the screw hole 57e provided at the center of the flat plate 57c through the insertion hole 71e of the outer piece 71a of the conductive plate 71, and the tip of the adjusting screw 77 is inserted into the horizontal piece of the front end inverted L-shaped portion of the bimetal 45. The initial position of the rear end of the bimetal 45 can be adjusted by bending the inner piece 71b by causing the adjusting screw 77 to be opposed to each other via 71b.

  The fixed terminal T1 is welded and fixed to the rear end of the vertical piece 71c of the conductive plate 71, and the other end of the braided wire 79D in which one end is welded to the movable contact 4A on the plate surface slightly ahead of the rear end of the bimetal 45. Are fixed, and the fixed terminal T1, the conductive plate 71, the bimetal 45, the braided wire 79D, and the movable contact 4A are electrically connected.

  On the other hand, the movable contact 4B that holds the second electromagnetic release device 47B is folded in a U shape with the upper end portion as an outer piece to form a conductive plate 80 parallel to the upper end portion. A lateral piece of the rear end L-shaped folded portion of the bimetal 46 is placed on the step surface and welded and fixed to suspend the bimetal 46.

  The second electromagnetic release device 47B includes a fixed iron core 57B, a leaf spring 59B, and a movable iron core 58B that are formed in the same shape as the first electromagnetic release device 47A, and is formed integrally with the fixed iron core 57B. The flat plate 57c ′ is inserted between the upper end portion of the movable contact 4B and the conductive plate 80, and the notches 57d ′ at the center of both side edges of the flat plate 57c ′ are inserted into the notches 57d ′ at the rear end portions of the movable contact 4B. The fixed iron core 57B is fixed to the upper end of the movable contact 4B by engaging the T-shaped piece 80c suspended from the center.

  The movable iron core 58B is fixed by caulking and fixing by inserting a protrusion (not shown) protruding from the surface on the fixed iron core 57B side into holes 59b 'and 59b' formed at the front end of the central piece 59a 'of the leaf spring 59B. The leaf spring 59B is swingably supported by the leaf spring 59B. The leaf spring 59B is formed by bending both side pieces 59c 'and 59c' formed on both sides of the center piece 59a 'along the outer surface of the both side pieces 57a' and 57a 'of the fixed core 57B. The locking pieces (not shown) that are arranged so as to protrude inwardly at the tips of the both side pieces 57c ′, 57c ′ are engaged with the recesses 57b ′, 57b ′ formed at the outer corners of the fixed iron core 57B. By being stopped, it is fixed to the fixed iron core 57B.

  The magnetic pole surface which is the tip of both side pieces 57a 'and 57a' of the fixed iron core 57B is opposed to the movable iron core 58B through a gap between the central piece 59a 'of the leaf spring 59B and both side pieces 59c' and 59c ', and is grounded. When an abnormal large current such as a short-circuit current flows to the bimetal 46 as a conducting conductor due to an accident or a short-circuit accident, the movable iron core 58B is attracted and shaken by the magnetic force generated on the magnetic pole surfaces of the both side pieces 57a ′ and 57a ′ of the fixed iron core 57B. The drive part 58b 'protruding from one side end face of the movable iron core 58B' is moved.

  An adjustment screw 77 ′ is screwed from behind into an screw hole 57 e ′ provided in the center of the flat plate 57 c ′ from an insertion hole (not shown) provided at the upper end of the movable contact 4 B, and the tip of the adjustment screw 77 ′ is located behind the bimetal 46. The front end position of the bimetal 46 can be adjusted by making the conductive plate 80 bend by facing the lateral piece of the end L-shaped portion through the conductive plate 80 and screwing the adjusting screw 77 ′. It has become.

  The other end of the braided wire 79B with one end welded to the selection terminal T2 is welded to the plate surface slightly behind the front end of the bimetal 46, and the blade receiving terminal T2, the bimetal 46, and the movable contact 4B are electrically connected. ing. The blade receiving terminal T2 is accommodated in a slide member 83 made of a synthetic resin molded product.

  Thus, when assembling the voltage side pole block SB1 of the present embodiment, the terminal block 10A is first 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 assembled at a predetermined position together with the torsion spring 36, and the blade receiving terminal T1 is housed in the housing portion 90 provided near the bottom of one end portion, and the vertical piece 71c of the conductive plate 71 is connected to the partition wall of the first side case 1A. The outer piece 71a is arranged so as to be parallel to the front surface of the front lateral wall portion 120a of the partition wall 120 along the L-shaped gap between 91 and 120, and is formed on the side flat inner surface of the first side case 1A. The first electromagnetic release device 47 </ b> A and the bimetal 45 are arranged on the upper wall surface of the separation wall 65. At this time, the semicircular rib 103 protruding from the inner surface of the first case 1A is fitted and positioned in the outer piece 71a of the conductive plate 71 and the U-shaped bent portion of the inner piece 71b.

  The movable contact 4A is fitted into the groove 54 of the cross bar 40, and the coil spring 53 is housed in the recess 54a and is rotatably disposed 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. Further, the second electromagnetic release device 47B and the bimetal 46 are housed in the space between the separation wall 65 and the partition wall 120, and the blade receiving terminal T2 is housed together with the slide member 83 together with the housing portion for the fixed terminal T1 of the first side case 1A. It is arranged in the inner storage part 200 located in front of 90. At this time, the leg piece 83a of the slide member 83 is also inserted into a slide groove formed on the outer side surface of the side wall of the first side case 1A through the insertion hole to expose the protruding portion 206 to the outside.

  In addition, the obliquely forward inclined portion at the center of the movable contact 4B is parallel to the bottom from the rear end of the separation wall 65 located slightly forward from the bottom of the first case 1A toward the other end of the first case 1A. Further, the movable contact 4B is disposed between the partition wall 95 extending obliquely forward from the parallel portion and the bottom portion of the first side case 1A, and the free end side of the movable contact 4B is interposed through the notch portion 14a of the partition wall 14. The fixed contact 12B is disposed in the space. At this time, the upper end portion of the movable contact 4B is fixed with ribs 96 projecting from the rear surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A. At this time, a semicircular rib 103 ′ protruding from the inner surface of the first side case 1 </ b> A is fitted into the U-shaped bent portion between the upper end portion and the conductive plate 80 and positioned.

  Further, the first tripping plate 41 and a torsion spring 81 are rotatably arranged at a fixed position, and the second tripping plate 42 is further rotatably arranged at a fixed position.

  In this way, as shown in FIG. 7, the components other than the intermediate case 7 and the terminal portion 10B, the release handle 17 ′, and the return spring 21 ′ accommodated in the recess 9 of the intermediate case 7 are placed on the first case 1A side. After arranging and assembling, the intermediate case 7 in which the terminal portion 10B, the release handle 17 ′ and the return spring 21 ′ are assembled in the concave portion 9 is arranged so as to overlap the first side case 1A side.

  When the intermediate case 7 is disposed at a fixed position on the first case 1A side, the free end side of the movable contact 4A is disposed in the recess 34 through the opening 39 of the vertical wall 32, and the terminal portion. The front end side portion of the fixed contact 12 </ b> A provided on 10 </ b> A is placed on the stepped surface 7 b of the bottom wall 7 a and the shaft is fitted in the recess 37 of the release handle 17.

  On the other hand, the stationary contact 12B provided in the terminal portion 10B is placed on the rib 26 on the bottom of the first side case 1A. Further, the rear surface of the rearward 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.

  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 and locking portions 101 at the tips of the four elastic locking pieces 100 at the front and rear ends of the first side case 1A integrally projecting from the first side case 1A to the second side case 1B side are located on the second side case 1B side. The first case 1 </ b> A and the second case 1 </ b> B are coupled and fixed to the corresponding hook-like hooked portions 102, thereby constituting the container 1. When the first side cases 1A and 1B are uncoupled and fixed, a screwdriver is inserted into the second side case 1B through the release holes 150 corresponding to the hooked portions 102, and the corresponding elastic members. The second side case 1 </ b> B can be removed from the first side case 1 </ b> A by pressing the hook engaging portion 101 of the stopper piece 100 forward to remove the hooked state with the hooked portion 102.

  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.

  Further, the heads of the adjusting screws 77 and 77 ′ corresponding to the bimetals 45 and 46 respectively face the opening 104 opened on the front surface of the vessel 1 and the opening 105 opened on the bottom, and an operation test after assembly is performed. The operation adjusting screws 77 and 77 ′ are screwed through the openings 104 and 105 to adjust the initial positions of the bimetals 45 and 46 so that an optimal operating point is sometimes obtained. The lids 106 ′ are fitted into the respective parts of the container 1 using its elasticity to cover the openings 104 and 105.

  Next, the operation of the voltage side pole block SB1 will be briefly described with reference to FIGS.

  FIG. 8 shows an open state. In this open state, the operating portion 6a of the handle 6 is in an inverted state with the recessed portion 50, and the engagement state between the one end of the operating plate 43 and the first tripping plate 41 is released. It is in the 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 forward at the free end (FIG. 8). And the movable contact 4B inserted through the kerf 55 has its free end moved forward (upward in FIG. 8) by its spring elastic force. The movable contacts 3A and 3B provided at the free ends are separated from the corresponding fixed contacts 2A and 2B.

  When the operation portion 6a of the handle 6 is rotated clockwise in this state, the front shaft 44a of the link 44 is pushed rearward, and the link 44 pushes down the operating plate 43 by the rear 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 front end of the cross bar 40, and rotates the cross bar 40 counterclockwise against the spring bias.

  By this rotation, the movable contact 4B inserted into the cut groove 55 of the cross bar 40 bends in a direction to move the free end backward (downward in FIG. 8), and the movable contact 3B at the free end is fixed. Contact the 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.

  When the handle 6 is further rotated clockwise, the front shaft 44b moves downward (leftward in FIG. 8) from the line connecting the position of the rear shaft 44b of the link 44 and the rotation center of the handle 6. In this state, the torsion spring 36 of the handle 6, the coil spring 62 that biases the cross bar 44, and the spring force of the movable contact 4 </ b> B are balanced so that one end of the operating plate 43 and the locking portion 41 e of the first tripping plate 41. The latch state is maintained, and the input state of FIG. 7 is maintained.

  Now, when the operating portion 6a of the handle 6 is rotated counterclockwise in the inserted state, the position of the front shaft 44a of the link 44 moves upward along a line connecting the rotation center of the handle 6 and the rear shaft 44b (FIG. 7). To the front (upward in FIG. 7), the latched state between the upper end (right end in FIG. 7) of the operating plate 43 and the locking portion 41e of the first tripping plate 41 is released, and the cross The bar 40 is rotated clockwise by the urging force of the coil spring 62, and the handle 6 is rapidly returned to the off side by the urging force of the torsion spring 36. By the clockwise rotation of the cross bar 40, the movable contact 4A rotates clockwise to move the free end forward, and the movable contact 3A is separated from the fixed contact 2A. Further, the movable contact 4B is not pushed downward and returned to its original state by its spring force, and the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is delayed from the time when the movable contact 3A is separated from the fixed contact 2A. This delay is the same during forced opening described later.

  Here, since the opening and closing of the contact portions 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 is consumed by the movable contact 3B made of a spring material. Can be prevented.

  When the overload current flows in the input state shown in FIG. 7, the bimetals 45 and 46 are heated and displaced by the overload current. Here, the bimetal 45 suspended from the front to the rear is displaced so that the rear end moves leftward in FIG. 7, and the bimetal 46 suspended from the rear to the front moves so that the front end moves rightward in FIG. The rear end of the bimetal 45 pushes the first drive part 41g of the first trip plate 41 in the left direction in FIG. 7, and the front end of the bimetal 46 pushes the second drive part 42d of the second trip plate 42 in FIG. To the right. That is, the free ends of the bimetals 45 and 46 are displaced in directions away from each other. This displacement causes the first and second trip plates 41 and 42 to rotate clockwise in FIG. 7. At this time, the opposing portion 42 a of the second trip plate 42 pushes the receiving portion 41 f of the first trip plate 41. A clockwise turning force is applied to the first tripping plate 41.

  Here, since the energization directions of the bimetals 45 and 46 are opposite to each other, when an overload current flows, magnetic forces in directions away from each other are generated in the bimetals 45 and 46. Therefore, the bending displacement of the bimetals 45 and 46 can be made quick, and as a result, the forced opening can be made faster. This operation is also effective at the time of forced opening due to a short-circuit current described later.

  Now, when the first tripping plate 41 rotates clockwise in FIG. 7, the latching state between the locking portion 41 e and one end of the operation plate 43 (the right end in FIG. 7) is released, and the operation plate 43 is connected to the rear of the link 44. It will rotate clockwise around the side shaft 44b. Therefore, the restriction of the cross bar 40 by the other end (the left end in FIG. 7) of the operating plate 43 is eliminated, and the cross bar 40 is rotated clockwise by the spring force of the coil spring to return the movable contacts 4A and 4B to the open state. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.

  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 81, and at the same time, the opposing portion 42a of the second tripping plate 42. The receiving portion 41f pushes and moves the second tripping plate 42 back. Further, the handle 6 is rotated in the opening operation direction (counterclockwise in FIG. 7) by the urging of the torsion spring 36.

  Further, in the above-mentioned charged state, for example, when a ground fault occurs on the blade receiving terminal T1 side and an abnormal large current flows to one of the contacts (the fixed contact 2A and the movable contact 3A), the first electromagnetic release device 47A is fixed. Magnetic force is generated in the iron core 57A, and the corresponding movable iron core 58A is attracted and swung. Thereby, the drive part 58b of the movable iron core 58A pushes the receiving part 88 of the first tripping plate 41 and rotates it clockwise in FIG. When the first tripping plate 41 rotates clockwise as in the case where an overload current flows, the latched state between the locking portion 41e and one end of the operating plate 43 (the right end in FIG. 7) is released, and the operating plate 43 rotates around the rear shaft 44b of the link 44 in the clockwise direction in FIG. Therefore, the restriction of the cross bar 40 by the other end of the operation plate 43 (the left end in FIG. 7) is eliminated, and the cross bar 40 is rotated clockwise in FIG. 7 by the spring force of the coil spring 62 to move the movable contacts 4A and 4B. Returning to the open state, the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B, respectively.

  Similarly, when a ground fault occurs on the blade receiving terminal T2 side and an abnormal large current flows through the other contact (the fixed contact 2B and the movable contact 3B), a magnetic force is applied to the fixed iron core 57B of the second electromagnetic release device 47B. Occurs and the corresponding movable iron core 58B is sucked and swung. As a result, the driving portion 58b 'of the movable iron core 58B pushes the receiving portion 42c of the second tripping plate 42 and rotates it clockwise in FIG. When the second trip plate 42 rotates clockwise as in the case where the overload current flows, the opposing portion 42a of the second trip plate 42 pushes the receiving portion 41f of the first trip plate 41 to perform the first trip. A clockwise turning force is applied to the release plate 41. 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 rear 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.

  Further, when an abnormal large current such as a short-circuit current flows due to a short circuit of the cord in the above-mentioned state, a magnetic force is generated in the fixed iron cores 57A and 57B of the first and second electromagnetic release devices 47A and 47B, and the corresponding movable The iron cores 58A and 58B are sucked and swung. Accordingly, the driving portion 58b of the movable iron core 58A pushes the receiving portion 88 of the first tripping plate 41, and the driving portion 58b ′ of the movable iron core 58B pushes the receiving portion 42c of the second tripping plate 42, respectively, as shown in FIG. Since the first tripping plate 41 is rotated 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 linked to the link 44. The crossbar 40 is rotated clockwise around the lower shaft 44b, and the restriction of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated. The crossbar 40 is rotated clockwise by the spring force of the coil spring 62. The movable contacts 4A and 4B are returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.

  Thereafter, when no magnetic force is generated in the fixed iron cores 57A and 57B of the first and second electromagnetic release devices 47A and 47B due to the interruption of the electric circuit, the movable iron cores 58a and 58B are restored to the original state by the spring force of the leaf springs 59A and 59B. The first tripping plate 41 returns to its original position by the urging of the torsion spring 81, and at the same time pushes the second tripping plate 42 back to the original position. Further, the handle 6 is rotated in the opening operation direction by the bias of the torsion spring 36.

  Next, the neutral pole block SB2 will be described with reference to FIGS. The neutral pole block SB2 has the same shape and dimensions as the body 1 of the voltage side pole block SB1 except that the through hole 201 is not provided in the upper front portion and the opening 105 is not provided in the bottom portion. It has the container 1, and a part of component common to the voltage side pole block SB1 is accommodated in the inside of the container 1. That is, the terminal body 10B, the fixed contact 2B, the movable contact 3B, the movable contact 4B, the blade receiving terminal T2, the opening / closing mechanism 5, the first tripping plate 41, and the like are housed in the body 1 of the neutral pole block SB2. The terminal portion 10A, the fixed contact 2A, the movable contact 3A, the movable contact 4A, the blade receiving terminal T1, the first and second electromagnetic release devices 47A and 47B, the thermal release device, the second trip plate 42, etc. are omitted. Has been. In addition, the same code | symbol is attached | subjected to the same component as the thing of voltage side pole block SB1, and description is abbreviate | omitted.

  The blade receiving terminal T2 and the movable contact 4B are connected by a connecting plate 171 made of a metal plate instead of the braided wire 79B and the second electromagnetic release device 47B, and are electrically connected via the connecting plate 171. Further, since the terminal portion 10A is omitted, the wire insertion hole 16A is blocked by the hole closing member 180 so that the electric wire is not erroneously inserted into the wire insertion hole 16A corresponding to the terminal plate 10A (see FIG. 1). ). The hole closing member 180 closes a recess formed as a moving space for the release handle 17 between the first side case 1A and the intermediate case 7 simultaneously with the wire insertion hole 16A. The synthetic resin molded product is attached to the container 1 so as to be sandwiched between the intermediate case 7 and formed in a shape that is flush with the front surfaces of the first side case 1A and the intermediate case 7. Thus, the neutral electrode block SB2 can be manufactured using only components common to the voltage side electrode block SB1 except that the connecting plate 171 and the hole closing member 180 are added.

  Next, the operation of the neutral pole block SB2 will be briefly described with reference to FIGS.

  When the operation portion 6a of the handle 6 is rotated in the opening operation direction (counterclockwise in FIG. 9) from the closing state shown in FIG. 9, the position of the front shaft 44a of the link 44 is changed from the rotation center of the handle 6 to the rear side. The upper end (right end in FIG. 9) of the operating plate 43 and the first tripping plate 41 are locked to move forward (upward in FIG. 9) beyond the line connecting the shafts 44b upward (right direction in FIG. 9). The latched state with the portion 41e is released, and the cross bar 40 is rotated clockwise by the urging force of the coil spring 62, and the handle 6 is rapidly returned to the off side by the urging force of the torsion spring 36. Due to the clockwise rotation of the crossbar 40, the movable contact 4B is not pushed downward and returns to its original state by its spring force, and the movable contact 3B at the free end is separated from the fixed contact 2B. (See FIG. 10).

  On the other hand, when the operation portion 6a of the handle 6 is rotated in the closing operation direction (clockwise in FIG. 10) from the opened state shown in FIG. 10, the front shaft 44a of the link 44 is pushed backward, and the link 44 is moved backward. The operating plate 43 is pushed down by the side 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 front end of the cross bar 40, and rotates the cross bar 40 counterclockwise against the spring bias. By this rotation, the movable contact 4B inserted into the groove 55 of the cross bar 40 bends in a direction to move the free end backward (downward in FIG. 10), and the movable contact 3B at the free end is fixed. Contact the contact 2B. When the handle 6 is further rotated clockwise, the front shaft 44b moves downward (leftward in FIG. 10) from the line connecting the position of the rear shaft 44b of the link 44 and the rotation center of the handle 6. In this state, the torsion spring 36 of the handle 6, the coil spring 62 that biases the cross bar 44, and the spring force of the movable contact 4 </ b> B are balanced so that one end of the operating plate 43 and the locking portion 41 e of the first tripping plate 41. 9 is maintained, and the closing state of FIG. 9 is maintained.

  Thus, the circuit breaker of the present embodiment uses a conventional two-pole type circuit breaker for the voltage side pole block SB1, and is a tripping device and a contact of one pole from the conventional two-pole type circuit breaker. (Non-fixed contact 2A and movable contact 3A) and the terminal portion 10A are used for the neutral pole block SB2, and one of the two electric wire insertion holes 16A and 16B in the neutral pole block SB2 is not used. Since the insertion hole 16A is blocked by the hole closing member 180, the connection error of the electric wire is prevented, so the body of the voltage side pole block SB1 and the neutral pole block SB2 configured by the conventional two-pole type circuit breaker 1 and 1 can be connected to each other by a connecting member 170 to realize an integrated three-pole circuit breaker. Compared with the case where a new three-pole circuit breaker is newly developed, the cost required for development and manufacturing, and Negative of time It is possible to provide a circuit breaker of inexpensive three-pole type with reduced. When the contact points of the two voltage side poles are distributed and arranged in the two container bodies 1 and 1 connected by the connecting member 170, the one container body 1 is separated from the tripping operation in the other container body 1. In order to perform the tripping operation, a mechanism for interlocking the open / close mechanisms 5 and 5 is necessary. However, since the two voltage side poles are housed in one vessel 1 and are used as the voltage side pole block SB1, There is an advantage that the interlocking mechanism as described above is unnecessary, and the number of parts can be reduced and the configuration can be simplified. Further, in the neutral pole block SB2, the electric wire inserted from the electric wire insertion hole 16B on the side close to the voltage side electrode block SB1 among the two electric wire insertion holes 16A and 16B is connected to the terminal portion 10B and the voltage side electrode. Since the wire insertion hole 16A far from the block SB1 is closed by the hole closing member 180, three wire insertion holes (the two wire insertion holes 16A and 16B of the voltage side pole block SB1 and the neutral pole block SB2 One wire insertion hole 16B) will be lined up close to each other, and when using a three-core cable (such as a VVF cable) for indoor wiring, the spacing between the three wires will be substantially the same, and there will be an extra cable. It can be wired nicely without burden.

  By the way, when only the contact of the neutral pole block SB2 is opened in the state where the contact of the voltage side pole block SB1 is turned on, there is a possibility that a phase failure of the neutral line occurs and an overvoltage is generated at the voltage side pole. Therefore, it is necessary to prevent the handle 6 of the neutral pole block SB2 from being inadvertently opened.

  Therefore, in the present embodiment, as shown in FIGS. 1 and 2, the operation of the handle 6 is prohibited so that the opening / closing mechanism 5 is operated to operate the handle 6 in the direction to open the contacts (the fixed contact 2B and the movable contact 3B). A cover 190 as a member is provided in the neutral pole block SB2.

  The cover 190 is formed by processing a sheet-like material having flexibility, and includes a concave portion 50 and a central portion of the front surface of the body 1 including the operation portion 6a of the handle 6 housed in the concave portion 50. A main portion 191 having a rectangular shape in plan view, a side piece 192 hanging backward from both end edges along the longitudinal direction (vertical direction) of the main portion 191, and a center of one end side (upper side) in the longitudinal direction of the main portion 191 A connecting piece 193 that hangs further back, a fixed piece 194 that is connected to the rear end of the connecting piece 193, and an extension that extends backward and downward from the other end side (lower side) of the main portion 191 in the longitudinal direction. A piece 195 and a display piece 196 extending from the side edge of the main portion 191 and the extending piece 195 to the side (right side) and covering the front surface of the body 1 of the voltage side pole block SB1 are integrally formed. .

  The fixed piece 194 is formed to have substantially the same width as the container body 1, and a pair of insertion pieces 194 a inserted into a gap g 1 formed between the front surface of the front lid 106 and the container body 1 sandwich the connecting piece 193. An insertion piece 194 b that protrudes downward from the left and right ends of the lower end edge and is inserted into a gap g <b> 2 that is similarly formed between the upper end edge of the front lid 106 and the container 1 is suspended downward from the upper end edge. This gap g2 leads to the space S in which the elastic locking piece 100 and the hooked portion 102 for connecting the first side case 1A and the second side case 1B are provided, and the insertion piece 194b inserted into the gap g2. Enters the space S, and the latching claws 194c provided at the left and right ends of the insertion piece 194b communicate with the space S, respectively, and are opened to the side surfaces of the first side case 1A and the second side case 1B. It is inserted and locked to 150 to prevent it from coming off (see FIG. 5).

  Thus, by fixing the fixing piece 194 to the body 1 as described above, the connecting portion of the connecting piece 193 and the fixing piece 194 is pivoted between a position covering the recess 50 and a position not covering it. The cover 190 is freely attached to the container body 1. Here, the extending piece 195 on the free end side of the cover 190 is provided with a locking portion 195 a that is locked to a locking projection 181 that protrudes forward from the upper end portion of the hole closing member 180. is there. The locking portion 195a is formed of a concave through hole through which the locking projection 181 is inserted. When the cover 190 is in a position covering the recess 50, the locking projection 181 is inserted through the locking portion 195a from the rear to the front. Thus, the cover 190 is locked to the periphery of the locking portion 195a, and the rotation of the cover 190 is restricted (see FIG. 1). Further, if the locking portion 195a and the locking projection 181 are unlocked by pulling the extended piece 195 by hand, the cover 190 can be rotated to a position where the recess 50 is not covered.

  As described above, in the neutral pole block SB2 of the present embodiment, the handle 6 is housed in the recess 50 on the front surface of the body 1 when the contact is turned on, and the cover 190 that covers the recess 50 housing the handle 6 from the front surface. Since the handle operation prohibiting member is constituted, there is an advantage that the structure of the handle operation prohibiting member can be simplified and the appearance is improved. Further, when the cover 190 is rotated to a position where the locking portion 195a is unlocked and the recess 50 is not covered, it is necessary to open the contact of the neutral electrode as in the case of performing the insulation resistance test of the branch circuit. In this case, the handle of the neutral pole block SB2 can be opened by operating the handle, and the cover 190 does not have to be completely removed from the body 1 so that the cover 190 is not lost. In the present embodiment, an opening 191a into which the operation portion 6a of the handle 6 protruding from the recess 50 is inserted in the state where the contact is open is provided in the main portion 191 of the cover 190, and the opening 191a of the main portion 191 is formed. The handle 6 in which the operation part 6a is inserted into the opening 191a of the cover 190 is covered with the part 50 except the opening 191a covering the recess 50 (main part 191). Therefore, the operation is restricted and the neutral pole block SB2 is locked at the position where the contact is opened (see FIG. 4), so that the person in charge of construction can easily perform the insulation resistance test of the branch circuit.

  By the way, as shown in FIG. 1, on the front surface of the display piece 196 provided on the cover 190, a mark M1 made of a black circle is formed at a position corresponding to one electric wire insertion hole 16A of the voltage side pole block SB1. In addition, a mark M2 made of a red circle is formed at a position corresponding to the other electric wire insertion hole 16B, and “N” indicating a neutral electrode at a position corresponding to one electric wire insertion hole 16B of the neutral electrode block SB2. A mark M3 is formed by encircling the letters. That is, which of the electric wire insertion holes 16A, 16B, and 16B of each of the blocks SB1 and SB2 should be inserted with the two voltage side electric wires and one neutral electric wire of the branch circuit, respectively. It can be clearly distinguished by the marks M1 to M3 on the display piece 196, and the connection error of the indoor wiring can be prevented.

  FIGS. 11-13 has shown the housing board W incorporating the circuit breaker of this embodiment. The housing board W is well known in the art, and as shown in FIG. 11, a box 300 for storing internal devices such as a main switch (main circuit breaker) MB and a branch switch SB, as shown in FIGS. Are provided with a window hole that exposes the handle of the main switch MB and the branch switch SB forward, and covers the internal device from the front, and is supported rotatably on the box 300 with a hinge to cover the front of the box 300. It is comprised with the door (not shown) opened and closed so that it may cover. When a single-phase three-wire branch circuit is configured using the circuit breaker according to the present embodiment, it is equivalent to two bipolar circuit breakers used in a conventional single-phase two-wire branch circuit. The voltage side pole block SB1 and the neutral pole block SB2 may be disposed in the space, and the construction work of the single-phase three-wire branch circuit can be easily performed.

It is a perspective view which shows this embodiment. It is an exploded perspective view same as the above. It is a perspective view of the state which removed the cover same as the above. It is a perspective view same as the above. It is sectional drawing of the neutral pole block and cover in the same as the above. It is a disassembled perspective view of the voltage side pole block in the same as the above. It is a side view of the state which showed the injection state of the voltage side pole block in the same as the above, and removed the 2nd side case. It is a side view of the state which showed the open state of the voltage side pole block in the same as the above, and removed the 2nd side case. It is a side view of the state which showed the insertion state of the neutral pole block in the same as the above, and removed the 2nd side case. It is a side view of the state which showed the open state of the neutral pole block in the same as the above, and removed the 2nd side case. It is a front view of the distribution board for houses incorporating the same as the above. It is a front view of the state integrated in the distribution board for houses. It is sectional drawing which a part of the distribution board for houses incorporating the same was abbreviate | omitted.

Explanation of symbols

SB1 Voltage side pole block SB2 Neutral pole block 1 Body 6 Handle 6a Operation part 16A, 16B Electric wire insertion hole 170 Connecting member 180 Hole closing member 190 Cover

Claims (7)

A circuit breaker used for a branch switch of a residential distribution board, a voltage side pole block for branching a pair of voltage side poles in a single-phase three-wire wiring path, and a neutral pole for branching a neutral pole The voltage side electrode block and the neutral electrode block each have a flat box shape made of an insulating material and are formed in the same shape and the same size as each other. Three plugs into which three conductive bars of two voltage side poles and neutral poles are respectively inserted at one end in the direction are arranged in a line along the front-rear direction perpendicular to the longitudinal direction, and each body Two electric wire insertion holes into which a branching electric wire can be inserted are arranged side by side along the short direction of the container body on the other end side in the longitudinal direction of
The voltage side electrode block is provided in the container body and connects two blade receiving terminals to which the conductive bars of the voltage side electrode are respectively inserted and connected through the insertion portion, and two electric wires inserted from the two electric wire insertion holes, respectively. Two contact parts, two contact points inserted into a conductive path provided independently between the two blade receiving terminals and the two terminal parts, an opening / closing mechanism for opening / closing the two contacts, and releasing the opening / closing mechanism The tripping device for opening the two contacts is housed in the container, and a handle for operating the opening / closing mechanism to open the two contacts when operated manually is provided on the front of the container so as to be rotatable. And
The neutral pole block is provided in the body and has one blade receiving terminal into which the conductive bar of the neutral pole is inserted and connected through the insertion portion, and one wire connecting the wire inserted from one of the wire insertion holes. The terminal part, one contact inserted in the conductive path provided between the blade receiving terminal and the terminal part, and an opening / closing mechanism for opening / closing the contact are housed in the container, and the opening / closing mechanism is opened when manually operated. A handle for opening the contact by operating is provided on the front surface of the container so as to be rotatable.
Connecting means for connecting the body of the voltage side pole block and the body of the neutral pole block in such a manner that the insertion part and the wire insertion hole are arranged along the short direction, and provided in the body of the neutral pole block A circuit breaker comprising: a hole closing member for closing an electric wire insertion hole that is not connected to a terminal portion of an electric wire inserted between the two electric wire insertion holes.   The neutral pole block has a wire insertion hole on the side far from the voltage side pole block while the wire inserted from the wire insertion hole on the side closer to the voltage side pole block is connected to the terminal portion of the two wire insertion holes. 2. The circuit breaker according to claim 1, wherein the circuit breaker is closed with a hole closing member.   The circuit breaker according to claim 1 or 2, further comprising a handle operation prohibiting member in the neutral pole block that prohibits the handle from being operated in a direction to open the contact by operating the opening and closing mechanism.   Provided in the vicinity of the three wire insertion holes on the front of the two connected bodies, and a display member that displays the correspondence between each wire insertion hole, the voltage side electrode, and the neutral electrode is provided integrally with the handle operation prohibiting member. The circuit breaker according to claim 3.   A recess for storing the handle when the contact is inserted is provided on the front of the neutral pole block, and the handle operation prohibition member cannot operate the handle stored in the recess by covering the recess from the front. The circuit breaker according to claim 3 or 4, wherein the circuit breaker comprises:   The cover includes a locking portion that is attached to the container so as to be rotatable between a position that covers the recess and a position that does not cover, and that is locked to the container at a position that covers the recess. 5. The circuit breaker according to 5.   7. The circuit breaker according to claim 6, wherein the cover is provided with an opening into which the handle protruding from the recess is inserted in a state where the contact is open, and the recess is covered at a portion excluding the opening of the cover.

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