JP6540199B2 - Circuit breaker terminal adapter - Google Patents

Description

  The present invention relates to a circuit breaker (auto breaker, leakage circuit breaker) disposed on a distribution board, control board or the like and branched and connected to a main circuit in the board, externally attached to the main body of the circuit breaker. The present invention relates to a terminal adapter of a circuit breaker relay connecting between the main circuit terminal and a bar conductor of a main circuit laid in a panel.

  First, as an example of a circuit breaker to which the terminal adapter according to the present invention is applied, outline drawings of a general wiring autobreaker (2-pole type) are shown in FIGS. 6 (a) to 6 (c). In the figure, 1 is a molded resin main body case with a contact opening / closing mechanism, an overcurrent trip device, an arc extinguishing device (not shown) and the like installed inside, and 2 and 3 are mains distributed to both ends of the main body case 1 Power supply side terminal and load side terminal of the circuit, 2a and 3a are terminal screws screwed to the power supply side terminal 2 and load side terminal 3 of each pole, 4 is an operation handle connected to contact switching mechanism, 5 is power side, load Phase separation walls formed at both ends of the main body case 1 to separate the different pole terminals on the side, 6 is a mounting hole of the main body case 1 perforated on the upper surface of the phase separation wall 5, and 7 is formed on the end face of the phase separation wall 5 It is an engaging groove for inlaying an accessory such as a barrier plate. The dimensions A shown in the figure are the external width of the main case 1 and the dimension B is the pitch between different poles of the main circuit terminals 2 and 3. Terminal screws screwed on the power supply side and load side terminals 2 and 3 Usually, M5 and M6 screws are used for 2a and 2b.

  Here, to describe the specifications of the auto breaker currently developed on the market, the JIS agreement type 2-pole auto breaker (ampere frame: 32 to 63 AF) has an outer width of the main body case 1 (A in FIG. 6A). Although the dimensions are 50 mm and the pitch between the main circuit terminals is 25 mm in Fig. 6 (a), product downsizing has progressed in recent years to meet the market needs for miniaturization, and these days A two-pole auto-breaker with the same amperage frame. Slim according to domestic and international standards by reducing the external width of the body case (dimension A in Figure 6) to 36 mm and the pitch between poles (dimension B in Figure 6) to 18 mm. An automatic breaker of the shape is to be lineup.

Next, a single-phase three-wire type distribution board is taken as an example, and a wiring circuit of the distribution board in which the auto breaker is disposed in the board is shown in FIG. In the figure, 8 is a cabinet type distribution board applied to mechanical equipment, for lighting, etc., 9 is a main branch (R, N, T phase) of the distribution board 8, and 10 is a main breaker connected to the main trunk 9. , 11 is a voltage bus bar (R, T phase) connected to the secondary side of the main team player 10 and laid in a board, 12 is a neutral bus (N phase), 13 is disposed on both sides of the bus bar. It is an auto breaker (2 poles) arranged in a line along the mounting rail, and between the power supply side terminal 2 (refer to FIG. 6) of the auto breaker 13 and the voltage bus 10 and the neutral bus 11 is a branch line 14 Connected through. Further, in the illustrated distribution board , voltage bus bar 10, neutral bus bar 11 and branch line 14 disposed in the board are all bare bar conductors, and the tip of this branch line (bar conductor) 14 is used as a power source for autobreaker 12. It is screwed to the side terminal (refer to FIG. 6) for direct connection.

  On the other hand, according to the Japan Distribution Control System Industry Association standard [Distribution board general rules · JSIA 300], the distance between the charging part and the non-charging metal body in the board, the clearance distance between different pole charging parts, and the creepage distance is 10mm (300V The creepage distance to which a line voltage exceeding 10 mm is applied is specified to be 20 mm or more. However, with regard to the over-current circuit breaker and other devices housed in the distribution board, the insulation distance of the charging portion is defined to conform to the standard of each device.

  According to the above standard, to directly connect the branch line (bar conductor) 14 installed on the distribution board of FIG. 7 to the power-supply side terminal 2 of the auto-breaker shown in FIG. It is necessary to secure a space distance of 10 mm or more between the different poles of the branch line (bared bar conductor) 14 or equivalent insulation strength.

  In this case, if the branch breaker (see FIG. 6) disposed in the distribution board is the above-mentioned JIS-agreement type breaker, the pitch between the main circuit terminals is 25 mm, so the power supply side terminals 2 (see FIG. 6) by screwing and directly connecting a bar conductor (branch line 14) of the same width (11.5 mm width) to the terminal bar, the standard of the distribution board between the different pole bar conductors. The spatial distance of 10 mm or more specified in

  On the other hand, if the slim auto-breaker described above (outside width of the main case 36 mm) is adopted for the branch breaker arranged on the distribution board, the occupied space of the branch player will be reduced in the board, and branch breakers will be added. Although downsizing of the electronic board becomes possible, in this case there are the following problems in order to secure the insulation distance of the wiring specified in the standard of the distribution board.

  That is, in the slim two-pole auto-breaker described above, the external width (dimension A of FIG. 6 (a)) of the main body case 36 is 36 mm, and the inter-electrode pitch of the main circuit terminal (dimension B of FIG. 6 (a)) Is 18 mm. For this purpose, if the branch conductor 14 (see Fig. 7) of the bar conductor (conductor width 11.5 mm) with the same width as the power supply side terminal 2 of the auto breaker is screwed and directly connected, the different pole The space distance between the bar conductors is 10 mm or less, and the space distance defined by the standard of the distribution board can not be secured if it is as it is.

  For this reason, conventionally, an insulating tape is wound around the circumferential surface of the bar conductor or the like in the entire length region of the branch line 14 to secure insulation strength conforming to the standard of the distribution board.

  Although it is also conceivable to use a bar conductor narrower than the main circuit terminal of the breaker body for the branch line 14 to increase the space distance between adjacent conductors to 10 mm or more, the bar conductor may be used as the main circuit terminal of the breaker. In order to connect to the main circuit terminal, it is necessary to process a screw hole corresponding to the terminal screw 2a (M5, M6 screw) screwed to the main circuit terminal into the bar conductor of the branch line 14, so It is difficult in practice to narrow the bar conductor width of the line 14.

  Also, as a measure for securing the insulation distance between the phases to the branch line 14 (see Fig. 7) in the panel externally connected to the main circuit terminal of the breaker, add a terminal adapter of another part to the main circuit terminal of the auto breaker, The external connection end side of the connection conductor (naked bar conductor) laid side by side inside the terminal block of this terminal adapter is bent and the arrangement pitch is expanded in the left and right direction, and then the external connection is made to the tip DESCRIPTION OF RELATED ART The terminal adapter which expanded the phase insulation distance of the branch line (bare bar conductor) by the side of an electric panel is known (refer patent document 1).

Unexamined-Japanese-Patent No. 11-297179 (FIG. 1)

  As mentioned above, when adopting a slim type breaker with a narrow pitch between different poles of the main circuit terminals as the branch breaker disposed in the distribution board, the branch lines connected to the terminals of the breaker body and laid in the board (Naked bar conductor) needs to secure the insulation distance specified in the standard of the distribution board, for which purpose conventionally the required insulation strength is achieved by winding the insulating tape around the bar conductor of the branch line in the distribution board However, this method has the problem that it takes time and effort and time for the insulating tape winding operation to be carried out at the enforcement site.

  In addition, the terminal adapter disclosed in the above-mentioned Patent Document 1 is assembled to the main circuit terminal portion of the circuit breaker (auto breaker), and the inter-phase pitch of the wiring in the panel externally connected to the terminals of the circuit breaker is expanded. Although there is also a known countermeasure, this terminal adapter is designed to widen the interval pitch of the connecting conductors provided on the terminal block in the left and right direction on the external connection end side, so the external width of the terminal adapter inevitably becomes It becomes larger than the outline width of the breaker body. For this reason, as shown in FIG. 7, when arranging and arranging a plurality of branch breakers side by side in a cabinet of a cabinet type distribution board, a dead space occurs between adjacent breakers, and space efficiency in the board Decreases. For this reason, there is a problem that even if a slim type autobreaker is adopted, it is not possible to achieve a compact and compact distribution board.

  The present invention has been made in view of the above-mentioned point, and its object is to provide a circuit breaker (auto breaker, earth leakage circuit breaker) for branch connection to a bar conductor of a main circuit arranged in a distribution board and laid in the board. For the target, without being restricted by the pitch between the poles of the main circuit terminals of the circuit breaker, the insulation distance specified by the standard of the distribution board between the branch lines (naked bar conductors) of the main circuit is selected. An object of the present invention is to provide a terminal adapter for a circuit breaker improved so that the bar conductor of the main circuit can be relayed to the main circuit terminal of the circuit breaker.

To achieve the above object, by the present invention lever is disposed in the distribution board, and a circuit breaker having a terminal portion which is disposed the terminals of each pole at the same height on one end of the main body case A terminal adapter for a circuit breaker, which is externally attached to the circuit breaker and relay-connects a terminal portion of the circuit breaker and a bar conductor of a main circuit laid in the panel, the terminal adapter being a main body of the circuit breaker It consists of a terminal block connected to the terminal of the main case with the same width outer shape as the case and a bar connecting conductor juxtaposed inside the terminal block corresponding to the terminal of each pole of the circuit breaker, and the bar of each pole The connecting conductor has the end on the connection side with the circuit breaker protruding from the terminal block to the outside, and a screw hole of the terminal screw is provided at the tip, and the bar adjacent to the connection side with the main circuit of the distribution board After setting the level difference between the connecting conductors, a terminal screw is provided at the tip of the connecting conductor. (Claim 1).

  Further, in the terminal adapter having the above configuration, at least one of the bar connection conductors of the respective poles juxtaposed inside the terminal block is bent and formed in a crank shape at a midway point in the longitudinal direction thereof. A level difference is set between the bar connection conductors (claim 2).

  Furthermore, a convex engagement rib is provided on the end face of the terminal block toward the end face of the main case of the circuit breaker, and the engagement rib is formed on the engagement streak groove formed on the end face of the main case of the circuit breaker. It is made to insert and join (Claim 3).

  By arranging the terminal adapter of the above configuration on the distribution board and externally attaching it to the terminal part of the circuit breaker connected to the main circuit in the board, the circuit breaker can be a slim circuit in which the pitch between the main circuit terminals is narrow. Even if it is a circuit breaker in the form of a main circuit without taking time-consuming measures such as reinforcing the insulation by winding an insulating tape around the bar conductor of the main circuit externally connected to the circuit breaker as in the prior art. It is possible to secure a space distance in accordance with the standard of the distribution board between different poles of the bar conductor.

Further, the terminal adapter is, by setting the same width contoured width of the terminal block to the outer width of the circuit breaker body, even when aligning a plurality of circuit breakers in the panelboard The space between the adjacent circuit breakers can be closely arranged to increase the space efficiency in the board without leaving a dead space between the adjacent circuit breakers, thereby achieving a compact and compact distribution board.

FIG. 8 is an external perspective view showing an assembled state in which the terminal adapter according to the embodiment of the present invention is applied to a slim two-pole circuit breaker and externally attached to the main body case. It is an assembly drawing corresponding to FIG. 1, Comprising: (a), (b), (c) is a top view, a side view, and an end view, respectively. It is a detailed structure figure of the terminal adapter in FIG. 1, Comprising: (a) is a disassembled perspective view, (b) is a perspective view showing the shape of the different-poles bar connection conductor in (a) It is a top view showing the state before connection with the terminal part of the circuit breaker corresponding to FIG. 1, and the terminal block of the terminal adapter connected here. FIG. 2 is a wiring structure diagram in which a circuit breaker with a terminal adapter shown in FIG. 1 is disposed on a distribution board and branched to a main trunk circuit laid in the board via a bar conductor, wherein (a) is a schematic wiring diagram (B) and (c) are a plan view and a side view of the wiring structure corresponding to (a), respectively. It is an external view of the 2 pole auto breaker corresponding to the circuit breaker of FIG. 1, Comprising: (a), (b), (c) is a top view, a side view, and an end view, respectively. Taking a single-phase three-wire distribution board as an example, it is a schematic wiring diagram in which a plurality of circuit breakers are housed and arranged in the board and branch-connected to a main circuit in the board.

  Hereinafter, an embodiment of the present invention will be described based on examples shown in FIGS. 1 to 4. The circuit breaker in the illustrated embodiment is a slim two-pole auto-breaker described above, and the members corresponding to FIGS. 6 and 7 are given the same reference numerals and the description thereof is omitted.

  First, in FIG. 1 and FIG. 2, the circuit breaker (hereinafter referred to as “auto breaker”) disposed in the panel as a branch breaker of the distribution board as shown in FIG. A main trunk circuit in which the terminal adapter 15 according to the present invention is externally attached to and connected to the main circuit terminal portion and the power supply side and load side terminals 2 and 3 of the autobreaker are installed in the distribution board via the terminal adapter 15 (The branch line 14 of the main circuit in FIG. 7) and the bar conductor of the load side circuit are connected in relay.

  The terminal adapter 15 is an assembly of a terminal block 16 made of molded resin and a bar connecting conductor 17 laid inside the terminal block 16 corresponding to each pole of the main circuit terminals 2 and 3 of the autobreaker. . Here, the terminal block 16 is set to the outer width C which is the same width as the outer width A of the main case 1 according to the outer shape of the autobreaker, and the end face of the terminal block 16 is then the main case of the auto breaker as described later. It abuts on the end face of 1 and makes an inlay connection between the two.

  In addition, with regard to the bar connecting conductor 17 for two poles laid inside the terminal block 16, one end thereof is protruded from the terminal block 16 to the outside, a screw hole of a terminal screw is provided at the tip thereof, and the main circuit terminal of the autobreaker Screw connection is made to 2 and 3 via the terminal screws 2a and 3a, and a level difference Δh is set on the opposite side of the external connection end as shown, and the terminal screw 18 is screwed at the tip doing. Reference numeral 16a denotes an insulating partition wall formed on the terminal block 16 so as to isolate between the bar connection conductors 17.

  Next, the detailed structure of the terminal adapter 15 is shown in FIGS. 3 (a) and 3 (b). As shown in the figure, between the poles of the bar connecting conductors 17a and 17b of two poles laid on both sides of the insulating partition wall 16a of the terminal block 16 is an inter-electrode pitch based on the specifications of the slim autobreaker described above. The same inter-electrode pitch (18 mm) as B is set. Further, while the bar connecting conductor 17a of one pole is a flat band-like flat rectangular bar conductor among the bar connecting conductors 17a and 17b, the bar connecting conductor 17b of the other pole is a midway point along the longitudinal direction thereof. Is bent upward in a crank shape (Z-shape), and a height difference .DELTA.h is set between the bar connection conductors 17a and 17b through the bent portion 17b-1. The height difference Δh is set to, for example, about 10 mm. Further, in accordance with the height difference Δh, the same height difference Δh as described above is formed between the base surfaces 16b and 16c of the bar conductor formed inside the terminal block 16.

  Further, as shown in FIG. 4, on the end face of the terminal block 16 (the surface facing the autobreaker), a convex engagement rib 16 d is provided so as to protrude along the insulating partition wall 16 a. When connecting the main body case 1 of the auto-breaker, the engaging rib 16d is inserted into the engaging groove 7 of the accessory formed along the phase spacing wall 5 of the auto-breaker so as to be inlay-joined. In addition, 16e in FIG. 4 is a concave hole which the screw-shaft part of the terminal screw 18 (refer FIG. 3) screwed in the bar connection conductor 17 fits.

  As described above, by setting the level difference Δh between the bar connection conductors 17a and 17b arranged side by side and laid on the terminal block 16, the mutual distance at the external connection end side on which the terminal screw 18 is screwed is It will expand by the amount to which the height difference Δh is added (three-square theorem).

  Therefore, in the assembled state (see FIG. 1) in which the terminal adapter 15 having the above configuration is connected to the main circuit terminals 2 and 3 of the slim type autobreaker described above, the autobreaker is disposed on the distribution board to When wiring to the main circuit and the load side circuit, connecting the bar conductor of the connection partner (for example, the branch line 14 of the main circuit in FIG. 7) to the bar connection conductors 17a and 17b of the terminal adapter 15 A space distance equal to or greater than the insulation distance (10 mm) specified in the standard of the distribution board is secured between the branch lines of the poles. As a result, it is possible to easily perform the wiring work complying with the standard of the switchboard without the need for the time-consuming work of winding an insulating tape or the like around the bar conductor inside the board to strengthen the insulation as in the prior art.

  Further, in the terminal adapter 15 of the illustrated embodiment, since the external width C of the terminal block 16 is set to the same width as the external width A of the autobreaker, the terminal adapter is connected to the main case 1 of the autobreaker. Also in the case (see FIGS. 1 and 2), the terminal adapter 15 does not protrude laterally beyond the main body case 1.

  Therefore, even when a plurality of autobreakers are arranged side by side in the same row in the cabinet of the cabinet type distribution board as shown in FIG. 7, no dead space is generated between adjacent autobreakers. Thereby, the space efficiency in the distribution board which accommodates a plurality of auto breakers can be improved, and the miniaturization and miniaturization of the distribution board can be achieved.

  In the illustrated embodiment described above, with regard to the bar connection conductor 17 disposed on the terminal block 16 of the terminal adapter 15, the middle portion of one bar connection conductor 17b is bent in a crank shape and the other linear bar connection is made The height difference Δh is set between the conductor 17a and the conductor 17a, but as an application example, the same crank-shaped bar conductor is used for the bar connecting conductors 17a and 17b of different polarity, and one of them is turned upside down It is also possible to set the height difference .DELTA.h, and according to this method, it is possible to make the bar connection conductors 17a and 17b of different polarity correspond to each other by one type of bar conductor.

  In the embodiments shown in FIGS. 1 and 2, the terminal adapter 15 is connected to the power supply side and load side terminals disposed at both ends of the autobreaker. For example, the load side circuit in the distribution board The terminal adapter 15 connected to the load side may be omitted as long as the wiring conductor is an insulated wire with a crimp terminal. In addition, as for the terminal adapter applied to a slim three-pole auto-breaker, as in the illustrated embodiment, a high and low step difference Δh is set between the bar connection conductors of each phase laid inside the terminal block, A wiring structure conforming to the standard of the board can be constructed.

  Next, as a reference diagram of the embodiment of the present invention, there is provided a wiring structure in which a terminal adapter 15 is externally attached to the power supply side terminal portion of the autobreaker and branch connection is made to a main trunk circuit laid in a distribution board via the terminal adapter 15. It shows in FIG. 5 (a)-(c). As is apparent from this figure, screw-connect the branch line (naked bar conductor) 14 of the main circuit laid within the panel to the bar connecting conductors 17a and 17b in which the level difference Δh is set inside the terminal adapter 15. Therefore, even if the auto-breaker is a narrow-pitched slim-type auto-breaker (inter-pole pitch B: 18 mm) described above, the hetero-pole branch line 14 without winding the insulating tape around the branch line 14 The insulation distance specified by the standard of the distribution board can be secured between them, and the wiring workability can be greatly improved.

1 Circuit breaker (auto breaker) body case 2 Power supply side terminal 3 Load side terminal 2a, 3a Terminal screw of main circuit terminal 7 Engagement groove for accessory parts 8 Cabinet type distribution board 13 Arranged in distribution board Branch breaker 14 Branch line of main circuit (naked bar conductor)
15 terminal adapter 16 terminal block 16a terminal block insulating partition 16b, 16c bar conductor pedestal surface 17, 17a, 17b bar connecting conductor 18 terminal screw A circuit breaker external width dimension B circuit breaker pole pitch C terminal adapter Width dimension Δh bar different pole connecting conductor high and low level difference between conductors

Claims (3)

Arranged distribution board in a circuit breaker having a terminal portion which is disposed the terminals of each pole at the same height on one end of the main body case, of the circuit breaker externally to the circuit breaker A terminal adapter for a circuit breaker that relays and connects a terminal portion and a bar conductor of a main circuit laid in a panel,
The terminal adapter, the terminal block in the main body case and the width of the outer shape of the circuit breaker linked to the terminal portion of the main body case, juxtaposed in the interior of the terminal block to correspond to the terminals of each pole of the circuit breaker Consisting of connected bar conductors,
And the bar connection conductor of each pole has the connection side end with the circuit breaker protruded from the terminal block to the outside and the screw hole of the terminal screw is provided at the tip, and the connection side end with the main circuit of the distribution board A terminal adapter for a circuit breaker characterized by setting a level difference between adjacent bar connection conductors in a portion and providing a terminal screw at the tip thereof.   The terminal adapter according to claim 1, wherein at least one of the bar connection conductors of the respective poles juxtaposed inside the terminal block is bent and formed in a crank shape at a midway point in the longitudinal direction thereof. A terminal adapter for a circuit breaker characterized in that a level difference is set between the bar connection conductors.   The terminal adapter according to claim 1, wherein the end face of the terminal block is provided with a convex engagement rib toward the end face of the main case of the circuit breaker, and the engagement rib is provided on the end face of the main case of the circuit breaker. A terminal adapter for a circuit breaker, wherein the terminal block is engaged with the formed engaging groove and the terminal block is coupled to the end face of the main case of the circuit breaker.