JP2007128795A - Relay terminal device for circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay terminal device for a circuit breaker capable of easily coping with use of a round pressure terminal when applied to a power distribution installation wherein several sets of circuit breakers are juxtaposed and used for wiring a wire from an upper stream side (power supply side), and wherein a structure is realized so that the wiring work can be easily done. <P>SOLUTION: In a box type case 9 whose inside is divided corresponding to each phase of a main circuit and a wire insertion window is opened in its front surface and an insulation frame which becomes a divided structure with an upper cover 10 for covering an upper surface of the case, a terminal board 11 press-fitted and held in a fixed position in the case with its rear end pulled out behind the insulation frame and a terminal screw 12 screwed in the terminal board to fasten the round pressure terminal 7 of the wire 5 are provided. The upper cover has an operation hole for the terminal screw and detachably snap fit coupled to the case. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applied to, for example, a power distribution facility in which a plurality of circuit breakers for wiring are juxtaposed in a switchboard, and wires from a higher level (power supply side) are wired to a power supply side terminal of the circuit breaker. The present invention relates to a relay terminal device (accessory) used when inputting power to a circuit breaker.

As a relay terminal device (accessory) that connects wires to the main circuit terminals of a circuit breaker, box terminal fittings with screws corresponding to the U, V, and W phases of the main circuit, and circuit breakers with the terminal fittings 2. Description of the Related Art Conventionally, a terminal block having a single structure in which a terminal plate for connecting with a main circuit terminal of a container is incorporated in an insulating frame (resin case) is known (for example, see Patent Document 1).
On the other hand, when supplying power by wiring power supply wires from the host (power supply side) to the power supply side terminals for multiple circuit breakers arranged side by side in the switchboard, each circuit breaker Connect a common bus bar between the power supply side terminals and connect the power supply side terminals of each group in parallel, and then connect the wires from the upper (power supply side) to the power supply side terminal for the specified circuit breaker. A wiring system that connects and inputs power is generally adopted. In this case, conventionally, the above-mentioned relay terminal block is externally attached to the circuit breaker, and the upper wire (power supply line) is connected to this terminal block. I am doing so. Next, FIG. 7 shows a relay terminal block having a conventional structure applied to the power input of this wiring system.

In FIG. 7, 1 is a circuit breaker (wiring circuit breaker), 2 is a power supply side terminal of the circuit breaker 1, 3 is a terminal screw, and 4 is a power supply side of a plurality of circuit breakers 1 juxtaposed in the panel. The bus bar on the power supply side is wired between the circuit breakers for each of the U, V, and W phases so that the terminals are connected in parallel, 5 is the upper (power supply side) wire, and 6 is the circuit breaker. 1 is a relay terminal block (accessory) for power input connected to 1. The terminal block 6 is connected to a power supply side terminal of a specified circuit breaker among a plurality of circuit breakers, and is connected to each via a bus bar 4. Power is input to the base circuit breaker 1.
Here, the terminal block 6 shown in the figure has an insulating frame (resin case) 6a, a terminal plate 6b corresponding to each phase of U, V, and W, and a box-type terminal fitting 6c, as in the structure disclosed in Patent Document 1. , And a terminal screw 6d, and the terminal of the terminal board 6b drawn behind the terminal block 6 is connected to the power supply side terminal 2 of the circuit breaker 1 together with the terminal portion branched from each phase of the bus bar 4. The screw 3 is tightened together, and in this state, the core wire 5a of the electric wire 5 inserted into the box-type terminal fitting 6c from the front of the terminal block 6 is tightened with the terminal screw 6d, so that the core wire 5a is electrically connected to the terminal plate 6b. .
JP 2000-123891 A

By the way, since the terminal block of the conventional structure provided with the box-type end fitting fastens the core wire 5a of the electric wire 5 inserted into the box-type terminal fitting 6c from the front with the terminal screw 6d, the electric wire 5 is pulled after wiring. If this is the case, there is a problem that the electric wire 5 is unexpectedly detached from the terminal block 6. Further, as described above, the upper wire 5 that is connected to the circuit breakers specified for the plurality of circuit breakers and inputs the power supply has a large cross-sectional area of the core wire 5a due to the current carrying capacity. In order to connect to the terminal plate 6b of the terminal block 6, it is necessary to tighten firmly. If the terminal screw 6d is not tightened properly, the insulation coating of the electric wire 5 may be burned out due to the disconnection of the electric wire as described above or local energization heat generation. May cause trouble.
Therefore, in order to increase the connection reliability of the wiring with respect to the circuit breaker, there is a demand to use a round crimp terminal for the electric wire 5 to prevent the electric wire from coming off, but in the structure of the terminal block 6 shown in FIG. A round crimp terminal cannot be used immediately, and in order to connect a round crimp terminal to this terminal block 6, the cover and terminal screw 6d are removed from the insulating frame 6a of the terminal block 6, and the round crimp terminal is passed through the terminal screw. Therefore, the terminal block must have a structure corresponding to the wiring work.

  The present invention has been made in view of the above points, and is applied to a power distribution facility in which a plurality of circuit breakers are juxtaposed and used to wire electric wires from a higher level (power supply side) as described above. An object of the present invention is to provide a relay terminal device for a circuit breaker that has a specific structure so that the use of a round crimp terminal can be immediately handled and the wiring work can be easily performed.

In order to achieve the above object, the terminal device of the present invention includes a box-shaped case that partitions the inside of the case corresponding to each phase of the main circuit and has an electric wire insertion window opened on the front surface thereof, and an upper surface of the case. A terminal plate that is press-fitted and held at a fixed position in the case and pulled out to the back of the insulating frame, and a round shape that is screwed to the terminal plate and is attached to the insulating frame that has a split structure with the attached upper cover A terminal screw for fastening the crimping terminal is provided, and an operation hole for the terminal screw is opened in the upper cover of the insulating frame, and the hook is detachably coupled to the case (Claim 1).
Further, in the terminal device having the above-described configuration, the terminal plate is formed with a screw hole for screwing a terminal screw, and is subjected to burring on the periphery of the screw hole and then formed at the tip of the terminal plate. Is press-fitted into a fitting portion formed inside the case of the insulating frame and locked in place (Claim 2).

  Further, the upper cover of the insulating frame is formed with tab-shaped projections with locking claws on both the left and right sides, and notches and claw engagements are formed on the left and right side walls of the case so as to face the tab-shaped projections. A mating hole is formed, and the upper cover is snap-fit coupled to the upper surface of the case to be detachably latched (Claim 3).

The terminal device having the above-described configuration can immediately respond to connection of electric wires with round crimp terminals. Therefore, this terminal device is applied to a circuit breaker arranged side by side in the panel as a relay terminal block for power input, and the terminal plate drawn out behind the terminal device is connected in parallel to the wire side terminal of the specified circuit breaker By inserting and screwing together with a bus bar for use, a round crimp terminal can be used for the electric wire from the upper side (electric wire side), and the connection can be made without disconnecting the electric wire, improving the reliability of the power input wiring. .
In addition, since the upper cover of the terminal device is snap-fitted to the upper surface of the case and hooked and joined, the connection and replacement of the electric wires and the attaching / detaching operation of the cover can be performed easily.

Hereinafter, embodiments of the present invention will be described based on examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 7, and the description is abbreviate | omitted.
First, in FIG. 1, a round crimp terminal is attached to the upper (power supply side) electric wire 5 connected to the power input terminal of the circuit breaker 1. The electric wire 5 with the round crimp terminal is connected to the circuit breaker. The terminal block 8 used as a relay terminal device connected to the power source side terminal 2 is crimped to an insulating frame (resin molded product) having a two-part structure composed of a case 9 and an upper cover 10 corresponding to each phase of the main circuit. The terminal board 11 and the terminal screw 12 corresponding to the terminal are provided. A perspective view of the assembly structure is shown in FIG. In order to externally attach the terminal block 8 to the circuit breaker 1, the front end portion of the terminal plate 11 drawn out from the insulating frame of the terminal block 8 together with the bus bar 4 described later is connected to the power source side of the circuit breaker 1. It is inserted into the terminal 2 and fastened together with the terminal screw 3 so as to be connected to the circuit breaker 1.

FIG. 2 shows a connection arrangement in the case where the terminal block 8 is applied as a relay terminal device for power input to a plurality of circuit breakers 1 arranged in the left and right (two in the drawing). The terminal portion 4a of each phase branched from the bus bar 4 for parallel connection is inserted into the power supply side terminal of the terminal block 8, and the terminal plate 11 of the terminal block 8 together with the terminal portion 4a of the bus bar 4 is inserted into the circuit breaker arranged on the left side. Are inserted and tightened together with the terminal screw 3.
Next, the detailed structure of the insulating frame case 9, the upper cover 10, and the terminal plate 11 of the terminal block 8 will be described with reference to FIGS.
First, the case 9 shown in FIGS. 4 (a) to 4 (c) is a box-type case with an open top surface, the inside of which is partitioned corresponding to each phase of U, V, and W by a phase interval wall 9a. An insertion window 9b for the electric wire 5 (see FIG. 1) corresponding to each phase is formed on the front surface of the case, and a slit-shaped notch 9c into which the terminal plate 11 (see FIG. 6) is fitted is formed on the rear surface. Further, a notch recess 9d into which engagement protrusions formed on the left and right side edges of the upper cover 10, which will be described later, and a claw engagement hole 9d-1 are formed at the central portion of the upper edge of the left and right side walls of the case 9, respectively. In the case, a stepped portion 9e for press-fitting and fixing the tip engaging projection of the terminal plate 11 to be described later, and a small projection fitting for press-fitting and holding the protruding portion formed on the left and right side edges of the intermediate portion of the terminal plate 11 A joint groove 9f is formed.

Further, the upper cover 10 shown in FIGS. 5 (a) to 5 (c) has screw operation holes 10a corresponding to the terminal screws 12 (see FIG. 1) of the respective phases on the upper surface thereof, and downwards on both left and right edges. Tab-like projection 10b that extends into the notch recess 9d (see FIG. 4) of the case 9 and engages with the claw engagement hole 9d-1 at the tip of the projection. The structure is formed.
On the other hand, in the terminal plate 11 shown in FIGS. 6A to 6C, a small connecting portion 11b is formed in an L shape behind the mounting seat portion (square shape) 11a of the round crimp terminal 7 shown in FIG. A screw hole 11c for screwing a terminal screw 12 (see FIG. 1) is opened on the plate surface of the mounting seat portion 11a, and a screw hole 11c is formed on the back side of the mounting seat portion 11a. A burring portion 11a-1 is formed along the periphery to secure a screw hole 11c having a required depth. A hook-shaped engagement protrusion 11d is formed at the center of the front end of the mounting seat 11a, and press-fitting protrusions 11e are formed on the left and right edges of the connection part 11b. The terminal plate 11 is latched and fixed at a predetermined position by press-fitting into a step 9e and a fitting groove 9f formed in the case 9 (see FIG. 4). Since the connecting portion 11b is inserted into the power supply side terminal 2 of the circuit breaker 1 together with the branch terminal portion 4a of the bus bar 4 shown in FIG. It has a tapered shape.

  With the above configuration, in order to externally attach the terminal block 8 to the circuit breaker 1, the tip of the terminal plate connecting portion 11b drawn from the terminal block 8 to the back is connected to the power supply side terminal 2 of the circuit breaker 1 as shown in FIG. And is fastened by the terminal screw 3. In order to connect the electric wire 5 with a round crimp terminal to the terminal block 8 in this state, the terminal screws 12 of the terminal block 8 are loosened, and the electric wires 5 of each phase are inserted into the window holes 9b from the front of the case 9, The round crimp terminal 7 is overlaid on the upper surface of the mounting seat portion 11a of the terminal plate 11, and is inserted into the round crimp terminal 7 so that the terminal screw 12 is screwed into the screw hole 11c of the mounting seat portion 11a. The round crimp terminal 7 is fastened. When performing this screwing operation, the cover 10 can be easily detached from the case 9 by pushing the engagement protrusion 10b-1 of the upper cover 10 with a fingertip to release the engagement with the case, When the cover 10 is attached to the case 9, the cover 10 can be easily hooked simply by pushing the cover over the case from above.

The exploded view showing the assembly structure of the terminal block of the embodiment of the present invention externally attached to the circuit breaker The top view showing arrangement at the time of connecting the terminal block of Drawing 1 to a circuit breaker 1 is an exploded perspective view of the terminal block shown in FIG. 3 is a detailed structural view of the case in FIG. 3, wherein (a), (b), and (c) are a front view, a plan view, and a cross-sectional view taken along line AA in (b), respectively. FIG. 4 is a detailed structural diagram of the upper cover in FIG. 3, wherein (a), (b), and (c) are a plan view, a side view, and a cross-sectional view taken along the line AA in FIG. FIG. 4 is a detailed structural diagram of the terminal board in FIG. 3, wherein (a), (b), and (c) are a plan view, a side view, and a front view, respectively. Cross-sectional view of a conventional power input terminal block externally attached to a circuit breaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Power supply side terminal 3 Terminal screw 4 Bus bar 5 Electric wire 7 Round crimp terminal 8 Relay terminal block for power input 9 Case 9a Phase gap wall 9b Electric wire insertion window 9d Notch recessed part 9d-1 Claw engaging hole 9e Terminal Plate fitting step 9f Mating groove 10 at terminal position Upper cover 10a Screw operation hole 10b Tab-like protrusion 10b-1 Engaging claw 11 Terminal plate 11a Mounting seat portion 11a-1 for round crimp terminal Burring processing portion 11b Connection Part 11c Screw hole 11d Engaging protrusion 11e Press-fit protrusion 12 Terminal screw

Claims (3)

A relay terminal device that is attached to the main circuit terminal of a circuit breaker and inserts and connects a wire with a round crimp terminal of each phase. The relay case device partitions the interior of the case according to each phase of the main circuit, and a wire insertion window on the front. An insulating frame that has a split structure of a box-shaped case with an opening and an upper cover attached to the upper surface of the case is press-fitted and held at a fixed position in the case, and its rear end is pulled out behind the insulating frame A terminal plate and a terminal screw that is screwed to the terminal plate and fastens a round crimp terminal, and is detachable from the case after opening an operation hole for the terminal screw in the upper cover of the insulating frame A relay terminal device for a circuit breaker, characterized in that it is latched and coupled to the circuit breaker. 2. The terminal device according to claim 1, wherein a screw hole for screwing a terminal screw is formed in the terminal plate, and a burring process is performed on the periphery of the screw hole, and then an engagement protrusion formed at the tip of the terminal plate. A relay terminal device for a circuit breaker, which is press-fitted into a fitting portion formed inside a case of an insulating frame and locked in place. 2. The terminal device according to claim 1, wherein the upper cover of the insulating frame is formed with tab-like projections with locking claws on both the left and right sides, and cut off on the left and right side walls of the case so as to face the tab-like projections. A relay terminal device for a circuit breaker, wherein a notch recess and a claw engagement hole are formed and an upper cover is snap-fit coupled to the case.

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