JP2006032319A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker capable of making the width of its breaker case smaller and preventing erroneous wire connection of mistaking an voltage pole for a neutral pole in a two-pole/one-element circuit breaker. <P>SOLUTION: In the circuit breaker, receptacle holes 5a, 6a, 7a of power source side terminals 5, 6 are provided on one side in the operational direction of an operating handle 3 provided on a front face 2a of the breaker case 2, and electric cable insertion holes 8a, 9a of two plug-in type load side terminals 8, 9 are provided on a center line A of the breaker case 2 on a vertical face 2d of the breaker case 2 on the other side and corresponding to the operational direction of the operating handle 3. The two-pole/one-element circuit breaker comprises the neutral pole which is the load side terminal 8 of the electric cable insertion hole 8a on the front side of the vertical face 2d and the voltage pole which is the load side terminal 9 of the electric cable insertion hole 9a on the back side of the vertical face 2d. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plug-in type load-side terminal of a circuit breaker suitable as a branch breaker arranged in parallel in a distribution board.

The circuit breaker for the branch circuit installed in the distribution board is provided with a tilting operation handle on the front of the circuit breaker case. The power supply terminal is on one side of the operation direction of the operation handle, and the other side is on the other side. A load side terminal is provided. In general, when the power supply side terminal is a screw type, two insertion holes are provided in the width direction of the circuit breaker case. When the power supply side terminal is a plug-in type, the operation handle depends on the shape of the conductive bar on the distribution board. Two or three insertion ports are provided side by side in the operation direction. Further, regardless of the structure of the power supply side terminal, the load side terminal is provided with two wire insertion holes arranged in the width direction regardless of whether it is a screw type or a plug type (for example, Patent Document 1, Patent Document) 2).

JP 2002-324475 A (FIGS. 1 and 2) Japanese Patent Laying-Open No. 2003-331707 (FIGS. 3, 5, and 6)

  In recent years, the number of branch breakers in the distribution board has increased with the increase in load equipment, and when installed in the distribution board, the branch breakers are juxtaposed in the width direction, thus reducing the size of the distribution board. Therefore, it is necessary to make the lateral width of the branch breaker as narrow as possible. However, when the circuit breaker used in the conventional branch breaker is plug-in type on the power supply side terminal, the insertion port is arranged side by side in the operation direction of the operation handle to reduce the width dimension, but the load side terminal Since the wire insertion holes are arranged side by side in the width direction of the circuit breaker case, it is almost limitative to reduce the width dimension of the circuit breaker case. In addition, the circuit breaker used in the 100V circuit is a two-pole one-element circuit, and overcurrent tripping means are provided in the voltage pole circuit. Since the wire insertion hole of the load side terminal and the wire insertion hole of the load side terminal of the neutral electrode are arranged side by side adjacent to each other, there is a risk that the connection will be mistaken.

  According to the first aspect of the present invention, a plurality of power supply side terminals are provided on one side in the operation direction of the operation handle provided on the front surface of the circuit breaker case, and two plug-in type terminals are provided on the other side. The circuit breaker provided with the load side terminal is characterized in that the wire insertion holes of the two load side terminals are arranged substantially in a line in the operation direction of the operation handle.

  According to the second aspect of the present invention, in the circuit breaker according to the first aspect, the wire insertion holes of the two load side terminals are provided so as to be at least partially on the front center line including the operation handle. It is characterized by that.

  According to a third aspect of the present invention, in the circuit breaker according to the first or second aspect, in the circuit breaker for a 100 V circuit in which the load side terminal includes a neutral electrode and a voltage electrode, The load side terminal is characterized in that the load side terminal on the front side of the circuit breaker case is a neutral electrode and the load side terminal on the back side is a voltage electrode.

  According to a fourth aspect of the present invention, in the circuit breaker according to the first or second aspect, the stepped portion is formed on the front side of the breaker case on the other side in the operation direction of the operation handle. The electric wire insertion hole of the load side terminal is provided in the front surface of the step portion.

  According to the circuit breaker according to claim 1, the plurality of power supply side terminals are provided on one side of the operation direction of the operation handle provided on the front surface of the circuit breaker case, and the two load-side plug-in sides are provided on the other side. In the circuit breaker provided with the terminal, the width dimension of the breaker case can be reduced by arranging the wire insertion holes of the two load side terminals in approximately one row in the operation direction of the operation handle. The one-element circuit breaker has an effect of preventing erroneous connection that mistakes the voltage electrode and the neutral electrode.

  According to the second aspect of the present invention, in the circuit breaker according to the first aspect, the wire insertion holes of the two load side terminals are provided so as to be at least partially on the front center line including the operation handle. Thus, there is an effect that the width dimension of the circuit breaker case can be reduced.

  According to a third aspect of the present invention, in the circuit breaker according to the first or second aspect, in the circuit breaker for a 100 V circuit in which the load side terminal includes a neutral electrode and a voltage electrode, The load side terminal has a neutral terminal on the load side terminal on the front side of the circuit breaker case, and a voltage electrode on the load side terminal on the back side to prevent electric shock accidents due to voltage application when touching the load side wiring. There is an effect that can be.

  According to a fourth aspect of the present invention, in the circuit breaker according to the first or second aspect, the stepped portion is formed on the front side of the breaker case on the other side in the operation direction of the operation handle. By providing a wire insertion hole for the load side terminal on the front side of the stepped portion, the wire insertion hole can be confirmed from the front direction of the circuit breaker, and since the wire can be inserted from the front direction, the wire connection workability is improved. There is an effect that it can be improved.

  The circuit breaker is provided with an insertion port of the power supply side terminal on one side of the operation direction of the operation handle provided on the front surface of the circuit breaker case, and is a vertical surface of the circuit breaker case on the other side and the operation direction of the operation handle. Wire insertion holes for the two load-type load terminals are provided on the center line of the matching circuit breaker case. In the circuit breaker of 2 poles and 1 element, the load side terminal of the electric wire insertion hole on the front side of the vertical plane is a neutral pole, and the load side terminal of the electric wire insertion hole on the back side of the vertical plane is a voltage electrode.

  A circuit breaker according to a first embodiment of the present invention will be described with reference to the accompanying drawings of FIGS.

  FIG. 1 shows an external perspective view of a circuit breaker for a 100 V circuit. Although the operation handle is provided on the upper side in FIG. 1, the circuit breaker is usually used with the surface having the operation handle as the front surface. Therefore, the surface having the operation handle will be described as the front surface.

  In the circuit breaker 1, an operation handle 3 for opening and closing an electric circuit is provided protruding from a front surface 2a of a cube-shaped thin circuit breaker case 2 formed of an insulating material. The operation handle 3 is pivotally supported on the left and right side surfaces of the circuit breaker case 2 and can be tilted in a direction perpendicular to the width direction. The rear surface opposite to the front surface 2a of the circuit breaker case 2 is an attachment surface 2b, and is attached by engaging an engaging means of a distribution board (not shown) with the attachment protrusion 4 at the end.

  The circuit breaker case 2 is on one side of the operation direction of the operation handle 3, and is provided on the vertical surface 2c perpendicular to the front surface 2a of the circuit breaker case 2 with three groove-like insertion ports 5a and 6a parallel to the mounting surface 2b. 7a are formed at intervals, and the two front-side insertion ports 5a and 6a constitute plug-in type power supply side terminals 5 and 6 to form three conductive bars of a single-phase three-wire distribution board ( Two of them (not shown) are electrically connected. In addition, the number of insertion openings of the power supply side terminal may be two according to the shape of the conductive bar of the distribution board.

  As shown in FIG. 2, two electric wire insertion holes 8 a and 9 a are provided on the operation handle 3 on the other side in the operation direction of the operation handle 3 and perpendicular to the front surface 2 a of the circuit breaker case 2. Are arranged in a line on the center line A in front view including the operation handle 3 and are provided with plug-in type load side terminals 8 and 9.

  FIG. 3 shows an internal structure diagram of the circuit breaker 1, and the two load-side terminals 8 and 9 include electric wire insertion holes 8a and 9a and terminal fittings 8b disposed in the inner part of the electric wire insertion holes 8a and 9a, 9b, press-contact springs 8c and 9c that press-hold the electric wire 10 to the terminal fittings 8b and 9b, and release buttons 8d and 9d that release the holding of the electric wire 10 by the press-contact springs 8c and 9c. The wire 10 can be connected simply by inserting it into the wire insertion holes 8a, 9a. The locking pieces of the pressure springs 8c, 9c bite into the wire 10 and lock them, and the substantially S-shaped pressure contact pieces are connected to the terminal fittings 8b, 9b. The electric wire 10 is pressed and connected. In order to release the connection of the electric wire 10, the release buttons 8d and 9d exposed on the vertical surface 2d of the circuit breaker case 2 are pushed and operated to the electric wire insertion holes 8a and 9a, thereby locking the locking springs 8c and 9c. Is unlocked, and the electric wire 10 is pulled out.

  Further, the terminal fittings 8b and 9b of the load side terminals 8 and 9 are connected to fixed contacts 11 and 11 having fixed contacts 11a at the tips, and movable contacts 12 and 11 having movable contacts 12a so as to be able to contact and separate from the fixed contacts 11a. 12 are arranged opposite to each other. The movable contact 12 is biased in a direction to be separated from the fixed contact 11 by the spring force of the spring 13. When the operation handle 3 is turned on, the movable contacts 12, 12 are connected to the spring 13 via the link mechanism 14. The movable contact 12a of the movable contact 12 contacts the fixed contact 11a of the fixed contact 11 to turn on the electric circuit, and the operation handle 2 is turned off. Then, the link mechanism 14 releases the pressing of the movable contacts 12, 12, and the movable contact 12 a of the movable contact 12 is separated from the fixed contact 11 a of the fixed contact 11 by the spring force of the spring 13 so that the electric circuit is turned off. It has become.

  The movable contact 11 is connected to the receiving blades 5 b and 6 b of the power supply side terminals 5 and 6 through the flexible electric wire 15. The power supply side terminals 5 and 6 are composed of insertion openings 5a and 6a and substantially U-shaped receiving blades 5b and 6b that sandwich the conductive bar, and the tip ends of the receiving blades 5b and 6b have portions that sandwich the conductive bar. It is formed into a shape that narrows and then extends outwardly and invites the conductive bar.

  The two load side terminals 8 and 9 have a load side terminal 8 on the front side of the circuit breaker case 2 as a neutral electrode and a load side terminal 9 on the back side as a voltage electrode. A bimetal 16 and an electromagnetic trip device 17 are provided as an overcurrent trip means in the electric circuit connected to 9. The overcurrent tripping means is interposed in a flexible wire 15 that connects the movable contact 12 and the power supply side terminal 6, and the bimetal 16 and the electromagnetic trip device 17 are connected by a conductive plate 18, and an intermediate portion of the bimetal 16. The flexible wire 15 is connected to the end of the conductive plate 18. Further, in the case of a circuit breaker for a 200 V circuit, both load side terminals become voltage electrodes, and therefore an overcurrent tripping means is provided in the electric circuit of each electrode.

  When an overcurrent exceeding the rated current flows in the electric circuit, the bimetal 16 is bent with a time delay according to the magnitude of the overcurrent, and the tripping member 19 is pressed and rotated at the tip of the bimetal 16 to rotate the link mechanism 14. Operate. Further, the electromagnetic trip device 17 attracts the movable iron piece 17b by the magnetic field generated in the fixed iron piece 17a when a large current such as a short circuit current flows in the electric circuit, and the tip of the movable iron piece 17b pushes and rotates the tripping member. Then, the link mechanism 14 is operated. Then, the pressing of the movable contacts 12, 12 is released by the operation of the link mechanism 14, and the movable contact 12 is separated from the fixed contact 11 by the spring force of the spring 13 to interrupt the electric circuit.

  By arranging the load side terminal 8 of the neutral electrode on the front side of the circuit breaker case 2 in this way, the electric wire on the front side that is likely to be touched by the body when the electric wire is connected to the load side terminal 8 is neutral electrode. Thus, an electric shock accident can be prevented, and the polarity of the load side terminal is different between the front and rear positions of the circuit breaker case 2, so that erroneous connection of the voltage electrode and the neutral electrode can be prevented.

  In the present embodiment, the wire insertion holes 8a, 9a of the load side terminals 8, 9 are provided so that the centers of the wire insertion holes 8a, 9a pass through the center line A in front view including the operation handle 3. As shown in FIG. 4, the wire insertion holes 8 a, 9 a of the load side terminals 8, 9 are provided so that at least a part of the wire insertion holes 8 a, 9 a covers the center line A in front view including the operation handle 3. It ’s fine.

  Second Embodiment A circuit breaker according to a second embodiment of the present invention will be described with reference to the attached drawings of FIGS. In addition, the same part as Example 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  In this embodiment, a stepped portion 2f is formed in the front surface 2a of the circuit breaker case 2 on the other side in the operation direction of the operation handle 3 on which the load side terminals 8 and 9 are arranged. Unlike the first embodiment, the wire insertion holes 8a and 9a of the two load-side terminals 8 and 9 are arranged on the front surface 2g at a substantially line in the front view center line A including the operation handle 3. Yes.

  Thereby, the connection work space of load side wiring becomes wide, and since it can be inserted from the front direction into the circuit breaker 1 while looking at the wire insertion holes 8a and 9a, the connection workability of the wires can be improved. . Further, since the electric wires connected to the load side terminals 8 and 9 are routed using the space of the step portion 2f, there is no interference with the front cover of the distribution board, and the depth dimension of the distribution board is increased. It can be prevented.

It is a perspective view of the circuit breaker concerning Example 1 of the present invention. It is explanatory drawing which shows the vertical surface which has arrange | positioned the load side terminal of the circuit breaker which concerns on Example 1 of this invention. It is explanatory drawing which shows the internal structure of the circuit breaker which concerns on Example 1 of this invention. It is a modification of the circuit breaker of this invention. It is a perspective view of the circuit breaker which concerns on Example 2 of this invention. It is explanatory drawing which looked at the circuit breaker which concerns on Example 2 of this invention from the front.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Circuit breaker case 3 Operation handle 5,6 Power supply side terminal 8,9 Load side terminal 8a, 9a Wire insertion hole

Claims (4)

  In the circuit breaker in which a plurality of power supply side terminals are provided on one side of the operation direction of the operation handle provided on the front surface of the circuit breaker case and two plug-in type load side terminals are provided on the other side, the two loads A circuit breaker characterized in that the electric wire insertion holes of the side terminals are arranged in a line in the operation direction of the operation handle.   2. The circuit breaker according to claim 1, wherein the wire insertion holes of the two load side terminals are provided so as to be at least partially on a center line in front view including the operation handle.   In a circuit breaker for a 100V circuit in which a load side terminal is composed of a neutral pole and a voltage pole, the wire insertion holes of the two load side terminals have a load side terminal on the front side of the breaker case as a neutral pole, The circuit breaker according to claim 1 or 2, wherein the load side terminal on the back side is a voltage electrode.   A stepped portion is formed in a front surface of the circuit breaker case on the other side in the operation direction of the operation handle, and a wire insertion hole for the load side terminal is provided on the front surface of the stepped portion. The circuit breaker according to claim 1 or 2.

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