JP2009043421A - Wiring breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring breaker whose surge absorbing component can be easily replaced in an energizable state. <P>SOLUTION: The wiring breaker 10 automatically cutting off a wiring path in cases of overload or short circuit includes: an external electrode 35 electrically connected to a terminal 30 and having a connection terminal section 38 receiving and outputting power from and to outside; a surge absorbing component 58 electrically connected to the terminal 30 and to the connection terminal section 38; and a cover member 42 slidably movable in the vicinity of the terminal 30. The surge absorbing component 58 is held on the cover member 42, and the cover member 42 is slid to place the surge absorbing component 58 in an energizable state between the terminal 30 and the connection terminal section 38. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a circuit breaker for wiring that automatically shuts off a wiring path when an overcurrent flows in a circuit due to an overload or a short circuit.

  2. Description of the Related Art Conventionally, power supply devices such as uninterruptible power supply devices and power conversion devices have been provided with a circuit breaker for wiring in order to prevent a load from being applied to an internal wiring path. Further, these power supply devices are provided with surge absorbing parts such as a surge absorber or a capacitor for absorbing lightning surge or external noise. Generally, the surge absorbing component is attached in the immediate vicinity of the input terminal or output terminal of the power supply device or in the immediate vicinity of the circuit breaker.

  Patent Document 1 discloses a terminal plug with a breaker provided with a circuit breaker for wiring. In this terminal plug with breaker, a surge absorbing component is attached in the immediate vicinity of the output terminal of the circuit breaker for wiring.

JP-A-10-14079 (abstract)

  However, in the terminal plug with breaker disclosed in Patent Document 1, the surge absorbing component is connected to the lower side of the circuit breaker for wiring. Accordingly, each surge absorbing component must be connected to a terminal of a circuit breaker for wiring, and there is a problem that workability for attaching the surge absorbing component is deteriorated. Further, the surge absorbing component replacement operation may be performed during energization. In this case, in order to maintain the energized state during the replacement work, it is necessary to supply power using another bypass circuit.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a circuit breaker for wiring that can easily replace a surge absorbing component while being energized.

  In order to solve the above-described problems, the present invention provides a circuit breaker having a terminal on the power supply side or load side, which automatically shuts off the wiring path in the event of an overload and short circuit, and is electrically connected to the terminal. The external electrode having a connection terminal portion for inputting / outputting electric power to / from the outside, the surge absorbing component electrically connected to both the terminal and the connection terminal portion, and the vicinity of the terminal slide A cover member that can be moved by a formula, holding the surge absorbing component on the cover member, sliding the cover member, and interposing the surge absorbing component between the terminal and the connecting terminal portion in a state where electricity can be passed Is.

  In the case of such a configuration, the surge absorbing component can be interposed between the terminal and the connection terminal portion simply by sliding the cover member toward the terminal side. For this reason, the operation of attaching the surge absorbing component is facilitated. In addition, since the surge absorbing component can be removed by sliding the cover member, it is easy to remove the surge absorbing component. Furthermore, the surge absorbing component can be replaced with the cover member as one unit. For this reason, it is not necessary to perform connection work of a single surge absorbing component, and the time for replacement work can be greatly shortened.

  In addition to the above-described invention, another invention further includes a plurality of terminals on each of the power supply side and the load side, a connection terminal portion corresponding to each terminal in the plurality of terminals, and surge absorption. When a plurality of parts are held on the cover member so as to correspond to each terminal and the cover member is slid, the surge absorbing part is interposed between the pair of terminals and the connection terminal part in a state where electricity can be passed. is there.

  In the case of such a configuration, the surge member can be interposed between the pair of terminals and the connecting terminal portion provided with a plurality of surge absorbing parts simply by sliding the cover member toward the terminal side. For this reason, the surge absorbing component can be easily attached. Further, a plurality of surge absorbing parts can be exchanged by a simple operation of sliding the cover member. For this reason, it becomes possible to reduce a work process significantly. Moreover, since the cover member is a slide type, the removal work of the surge absorbing component is facilitated.

  Furthermore, in another invention, in addition to the above-described invention, the external electrode further forms one power line connecting the connection terminal portion and the terminal. When comprised in this way, a surge absorption component can be replaced | exchanged in the state which the connection terminal part and the terminal supplied with electricity. Therefore, it is not necessary to provide another bypass circuit when replacing the surge absorbing component.

  ADVANTAGE OF THE INVENTION According to this invention, the circuit breaker for wiring which can replace | exchange a surge absorption component easily and in the state which can be supplied with electricity can be provided.

(First embodiment)
Hereinafter, a circuit breaker 10 according to a first embodiment of the present invention will be described with reference to the drawings. In the following description (common to each embodiment), the arrow X1 direction shown in FIGS. 1 to 4, 6 and 7 is the front, the arrow X2 direction is the rear, the arrow Y1 direction is the left, the arrow The Y2 direction is defined as right, the arrow Z1 direction is defined as up, and the arrow Z2 direction is defined as down.

  FIG. 1 is an exploded perspective view of a circuit breaker 10 according to the first embodiment of the present invention. FIG. 2 is a plan view showing a state where the cover body 40 with surge is removed from the circuit breaker 10 for wiring according to the first embodiment of the present invention. FIG. 3 is a diagram showing the configuration of the cover body with surge 40 in FIG. 1, and FIG. 3 (A) is a view showing a state in which the cover body with surge 40 is viewed from the direction of arrow A in FIG. B) is a side sectional view of the cover body 40 with surge. FIG. 4 is a plan view of the circuit breaker 10 according to the first embodiment of the present invention.

  The circuit breaker 10 for wiring is a circuit breaker for wiring used for a three-phase three-wire electric circuit. As shown in FIG. 1, the circuit breaker 10 for wiring includes a circuit breaker body 12, three external electrodes 35 attached to the power supply side of the circuit breaker body 12, and a surge attached to the power supply side region of the circuit breaker body 12. The cover body 40 is mainly composed of.

  The breaker body 12 has a function as a breaker that avoids damage to the load circuit and the like by cutting off the power supply. The circuit breaker body 12 is covered with a case body 14 formed of an insulating material such as synthetic resin. The case body 14 has, for example, three parts: a central case part 16, a front case part 18, and a rear case part 20. A changeover switch 21 for turning on and off the power supply is provided in the center of the center case portion 16 in the plane. When the change-over switch 21 is pulled forward, it enters an energized state, and when it is pulled backward, it enters a cut-off state. Further, a tripping mechanism (not shown) that cuts off the energized state and an arc extinguishing device (not shown) that extinguishes an arc generated at the time of interruption are incorporated in the central case portion 16.

The front case portion 18 is formed with three front space portions 22 that open forward and upward. In the present embodiment, three front space portions 22 are formed so as to be lined up on the left and right. Specifically, outer walls 25 are provided upright at both left and right ends of the base portion 23, and a space between the two walls 24 is provided on the base portion 23 so as to be along the X ₁ -X ₂ axis direction. It is partitioned. Further, a cutout portion 26 that is cut out in a groove shape along the vertical direction is formed on the side surface in the vicinity of the boundary portion between the front case portion 18 and the central case portion 16.

As in the case of the front case portion 18, the rear case portion 20 is also formed with three rear space portions 27 that open rearward and upward. Specifically, the outer wall 29 is provided at the left and right ends of the base portion 23, two partitions the space therebetween are provided along the X ₁ -X ₂ axially on the base portion 23 (see Figure 2) It is partitioned by a wall 28. In the present embodiment, the rear case portion 20 is formed with a shorter length in the X ₁ -X ₂ axis direction than the front case portion 18.

  A total of three power supply terminals 30 connected to the power supply side are fixed to the base portion 23 in the vicinity of the rear end portion of each front space portion 22. Each power supply terminal 30 protrudes upward from the upper end surface 18 a of the front case portion 18. The power supply terminal 30 has a cylindrical shape, and a thread groove is formed on the outer peripheral surface thereof. On the other hand, a total of three load terminals 31 connected to the load side are fixed to the base portion 23 at substantially the center of each rear space portion 27 (see FIG. 2). Each load terminal 31 is provided so as to protrude upward from the base portion 23, but does not protrude above the upper end surface 20 a of the rear case portion 20. The load terminal 31 has a cylindrical shape, and a thread groove is formed on the outer peripheral surface thereof.

As shown in FIGS. 1 and 2, a total of three external electrodes 35 are disposed in each front space 22. The external electrode 35 is made of a conductive metal such as copper or aluminum. The external electrode 35 includes a flat plate portion 36 having a vertically long flat plate shape in the X ₁ -X ₂ axis direction, and an L-shaped terminal portion 37 extending upward from a midway portion of the flat plate portion 36. Yes. The L-shaped terminal portion 37 has a form in which a flat plate is bent into an L shape. Specifically, the L-shaped terminal portion 37 includes an upper extension portion 37a extending upward from the flat plate portion 36, and a front extension portion 37b extending forward from the tip of the upper extension portion 37a. It is composed of In the vicinity of the front end portion and the rear end portion of the flat plate portion 36, circular holes 36a and 36b that are circular holes are provided. A portion of the external electrode 35 on the front end side of the flat plate portion 36 (near the region having the circular hole 36a) serves as a connection terminal portion 38 for connection to the outside. The external electrode 35 is fixed in the front space portion 22 by inserting the circular hole 36b through the power supply terminal 30 and fastening the nut 39 to the power supply terminal 30 from above. In a state where the external electrode 35 is fixed in the front space portion 22, the front extension portion 37b of the L-shaped terminal portion 37 projects upward from the upper end surface 18a.

  As shown in FIG. 1 and FIGS. 3A and 3B, the surge cover body 40 includes a synthetic resin cover member 42 and a substrate 50 to which a surge absorbing component 58 is attached. As shown in FIG. 1, the cover member 42 includes a flat planar portion 43 and two side surface portions 44 extending from the left and right ends of the planar portion 43 so as to face each other in the same direction. Yes. As shown in FIGS. 3A and 3B, a rectangular recess 45 that is recessed upward is formed on the lower surface 43 a of the flat portion 43. In addition, three circular holes 46 are provided behind the concave portion 45 in the flat portion 43 so as to be lined up in the left-right direction. A convex portion 47 that protrudes inward is provided at the rear ends of the side surface portions 44. The convex portion 47 is provided so as to extend from the lower surface 43 a of the flat surface portion 43 to the lower end of the side surface portion 44.

  A substrate 50 is disposed in the recess 45. The substrate 50 is fixed in the recess 45 by an adhesive (not shown) or bolts. As shown in FIG. 3B, the substrate 50 is completely contained in the recess 45. Therefore, in the present embodiment, the substrate surface 50 a of the substrate 50 does not protrude downward from the lower surface 43 a of the flat portion 43. As shown in FIG. 3A, the substrate 50 has a rectangular shape, and three surge absorbing parts 58 are attached on the substrate 50 so as to be lined up on the left and right. For example, a surge absorber can be employed as the surge absorbing component 58. In addition to the surge absorber, a capacitor, arrester, varistor, or the like may be employed as the surge absorbing component 58. In addition, the substrate 50 is formed with three conductive substrate terminals 52 arranged side by side on the front side of the surge absorbing component 58. A grounded ground terminal 54 is formed behind the surge absorbing component 58 attached to the center. Each surge absorbing component 58 has its input side connected to the left substrate terminal 52 and its output side connected to the ground terminal 54 by a wiring pattern formed on the substrate 50.

  As shown in FIGS. 1 and 4, the cover body 40 with surge is put on the front case portion 18 so that each power supply terminal 30 is inserted into each circular hole 46 provided in the flat portion 43. And the part which protruded from the plane part 43 in each power supply terminal 30 is fixed with respect to the front case part 18 by fastening with the cap 48. FIG. Examples of the material of the cap 48 include non-conductive resin. A screw hole (not shown) in which a screw groove is formed is formed in the center of the cap 48, and the cap 48 can be fastened by screwing the tip of the electrode terminal 30 into the screw hole (not shown). ing. When covering the cover body 40 with surge on the front case portion 18, the convex portion 47 is engaged with the cutout portion 26 and then slid downward. The convex cover 47 is engaged with the notch 26, whereby the cover body 40 with surge is guided vertically downward. In a state where the cover body with surge 40 is fixed to the front case portion 18, the front extending portions 37 b of the L-shaped terminal portions 37 are in contact with the substrate terminals 52 of the substrate 50. Further, in a state where the cover body 40 with surge is put on the front case portion 18, each surge absorbing component 58 is in a state of being housed in each front space portion 22.

  FIG. 5 is a circuit block diagram of the circuit breaker 10 for wiring.

  As shown in FIG. 5, each connection terminal portion 38 connected to the outside is connected to each power supply terminal 30 of the circuit breaker body 12. Each power line connecting the connection terminal portion 38 and the power supply terminal 30 is connected to the surge absorbing component 58 via each board terminal 52 formed on the board 50. Each surge absorbing component 58 is grounded via a ground terminal 54. Each power line connecting the connection terminal portion 38 and the power supply terminal 30 is an external electrode 35. Connection and disconnection between the power supply terminal 30 and the load terminal 31 are performed by the operation of the circuit breaker body 12. With the configuration shown in FIG. 5, when a surge or noise enters from the connection terminal portion 38, the surge absorbing component 58 functions, and the surge or noise flows to the ground side. Therefore, it is possible to avoid the surge or noise that has entered the connection terminal portion 38 from entering the circuit breaker body 12.

  In the circuit breaker 10 configured as described above, the three surge absorbing parts 58 are electrically connected to the external electrodes 35 by simply sliding the cover body with surge 40 downward. For this reason, the installation work of the surge absorbing component 58 is facilitated. Moreover, when replacing the surge absorbing component 58, the cover body with surge 40 can be replaced as a single unit, so that it is not necessary to replace the surge absorbing component 58 alone. As a result, the replacement work of the surge absorbing component 58 is facilitated, and the working time can be greatly shortened. Further, the surge cover body 40 can be attached and detached while the connection terminal portion 38 and the power supply terminal 30 are electrically connected by the external electrode 35. For this reason, it becomes possible to replace the surge absorbing component 58 while maintaining the energized state. Therefore, there is no need to switch to another bypass circuit. Further, since the cover body with surge 40 is fixed by the cap 48, the cover body with surge 40 can be firmly fixed to the circuit breaker body 12. Therefore, the L-shaped terminal portion 37 and the substrate terminal 52 can be reliably connected. As a result, the contact resistance can be reduced, the wiring impedance can be reduced, and the function of the surge absorbing component 58 can be effectively exhibited.

(Second Embodiment)
Hereinafter, a circuit breaker 60 according to a second embodiment of the present invention will be described with reference to the drawings. In addition, in the circuit breaker 60 for wiring which concerns on 2nd Embodiment, while attaching | subjecting the same code | symbol about the matter which is common in 1st Embodiment, the description is abbreviate | omitted or simplified.

  FIG. 6 is an exploded perspective view of the circuit breaker 60 for wiring according to the second embodiment of the present invention. 7 is a diagram showing the configuration of the cover body with surge 80 in FIG. 6, and FIG. 7A is a diagram showing a state where the cover body with surge 80 is viewed from the direction of arrow B in FIG. (B) is the figure which shows the state which looked at the cover body 80 with a surge from the arrow C direction in (A).

  The circuit breaker 60 for wiring in the present embodiment is also a circuit breaker used for a three-phase three-wire electric circuit. As shown in FIG. 6, the circuit breaker 60 for wiring mainly includes a circuit breaker body 62, an external electrode 70, and a cover body 80 with surge.

The circuit breaker body 62 is formed substantially symmetrically in the front-rear direction around the Y ₁ -Y ₂ axis. In each front space 22, a total of three external electrodes 70 are arranged as in the case shown in FIG. 1 and the like. The external electrode 70 has a flat plate portion 71 and an L-shaped terminal portion 72 extending upward from a midway portion of the flat plate portion 71. The L-shaped terminal portion 72 has a form in which a flat plate is bent into an L shape. Specifically, the L-shaped terminal portion 72 extends upward from the middle portion of the flat plate portion 71 and the rear extension extending backward from the tip of the upper extension portion 72a. It consists of part 72b. In the vicinity of the front end portion and the rear end portion of the flat plate portion 71, circular holes 71 a and 71 b that are respectively circular holes are provided. In a state where the external electrode 70 is fixed in the front space portion 22, the height of the rearward extension portion 72 b of the L-shaped terminal portion 72 is lower than the upper end surface 18 a of the front case portion 18.

  As shown in FIGS. 6 and 7A and 7B, the cover body with surge 80 is constituted by a cover member 81 and a substrate 90 to which the surge absorbing component 58 is attached. The cover member 81 is provided with a partition portion 84 that partitions the space between the opposing side surface portions 44 into three equal parts. The partition portion 84 extends downward from the back side of the flat portion 43. Moreover, the partition part 84 is formed so that it may reach from the front-end part 43d of the plane part 43 to the approximate center. As shown in FIG. 7, a groove 85 is formed on the inner side surface 44 a of the both side surface portions 44 so as to extend from the back side of the flat surface portion 43 to the lower end of the side surface portion 44. The groove 85 is formed so as to face a position slightly behind the partition 84. The groove 85 is provided to lock the substrate 90 disposed on the cover member 81. The substrate 90 is inserted from below the cover member 81 so that the left and right ends thereof are accommodated in the groove 85. Further, the substrate 90 is fixed to the cover member 81 with an adhesive or a bolt (not shown) in a state where both left and right ends are accommodated in the groove 85.

  In the present embodiment, as shown in FIG. 7A, the substrate terminal 52 protrudes toward the back side of the substrate 90. The substrate 90 is attached to the cover member 81 with the side on which the ground terminal 54 is formed facing upward and the substrate surface 90a facing forward. In a state where the substrate 90 is attached to the cover member 81, each surge absorbing component 58 is accommodated in a space partitioned by the partition portion 84 in the cover member 81 as shown in FIG.

  In a state where the cover body with surge 80 is attached to the circuit breaker main body 62, the upper end surface of the rear extension 72 b in the L-shaped terminal portion 72 comes into contact with the back side surface 52 a of the portion protruding toward the back side of the substrate terminal 52. By this contact, the connection terminal portion 74 of the external electrode 70 and the surge absorbing component 58 can be electrically connected. The circuit configuration of the circuit breaker 60 for wiring is the same as the configuration shown in FIG.

  In the circuit breaker 60 configured as described above, the three surge absorbing parts 58 are electrically connected to the external electrodes 70 only by sliding the cover body with surge 80 downward. In addition, the surge absorber 58 can be easily attached. Further, when replacing the surge absorbing component 58, the cover body with surge 80 can be replaced as a single unit, so that it is not necessary to perform the replacement work with the surge absorbing component 58 as a single unit. As a result, the surge absorbing component 58 can be easily replaced. Moreover, since the cover body 80 with surge can be attached and detached while the connection terminal portion 74 and the power supply terminal 30 are electrically connected, the surge absorbing component 58 can be replaced while the energized state is maintained.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be implemented in various modifications.

  In each of the embodiments described above, the cover bodies 40 and 80 with surge are fixed to the circuit breaker main bodies 12 and 62 by tightening the cap 48 to the power terminal 30, but the present invention is not limited to this fixing method. . For example, by providing a screw hole in the upper end surface 18a of the front case portion 18 and providing a hole in the flat surface portion 43, inserting a screw through the hole and screwing the screw into the screw hole, the cover bodies with surges 40, 80 are provided. May be fixed to the circuit breaker bodies 12 and 62. In addition, the cover body with surge is provided by providing an engagement portion such as a claw on the cover body 40, 80 side with surge, a recess portion on the circuit breaker body 12, 62 side, and engaging the engagement portion with the recess portion. 40 and 80 may be fixed to the circuit breaker bodies 12 and 62.

  Moreover, in each above-mentioned embodiment, although the cover bodies 40 and 80 with a surge have the structure which can be completely removed from the circuit breaker main bodies 12 and 62, it is not limited to such a structure. For example, the protrusion 47 is a protrusion provided in the vicinity of the lower ends of the cover members 42 and 81, and the upper end of the notch 26 is closed to bring the protrusion into contact with the portion where the notch 26 is closed, It is good also as a structure which prevents that the cover bodies 40 and 80 with surges remove | deviate from the circuit breaker main bodies 12 and 62 completely. When such a configuration is adopted, a biasing member that biases the surge-covered cover bodies 40, 80 upward is provided, and the surge-covered cover bodies 40, 80 and the circuit breaker bodies 12, 62 can be engaged. When the engagement portion is provided and the engagement between the two is released, the urging force of the urging member causes the projection provided on the surge-covered cover members 40 and 80 to abut the portion where the notch portion 26 is closed. It is also possible to adopt a configuration in which the disengaged state can be maintained.

  In each of the above-described embodiments, the boards 50 and 90 are provided with the three surge absorbing parts 58. However, the number of the surge absorbing parts 58 is not limited to three. , 90 may be provided with four or more surge absorbing parts 58. In addition to the surge absorber, other types of components such as a capacitor can be adopted as the surge absorbing component 58. For example, as shown in FIG. A surge absorber and a capacitor may be provided side by side.

  Further, in each of the above-described embodiments, the circuit breakers 10 and 60 are three-wire type circuit breakers, but the circuit breakers 10 and 60 are not limited to the three-wire type, and two or less lines are used. It is also possible to use more than four lines.

  Moreover, in each above-mentioned embodiment, although the cover bodies 40 and 80 with surge are arrange | positioned at the power supply terminal 30 side, the position which arrange | positions the cover bodies 40 and 80 with surge is limited to the power supply terminal 30 side. It may be arranged on the load terminal 46 side instead of the one. Moreover, you may make it arrange | position the cover bodies 40 and 80 with a surge on both the power supply terminal 30 side and the load terminal 31 side.

  The circuit breaker of the present invention can be used in power supply devices such as uninterruptible power supply devices and power conversion devices.

It is a disassembled perspective view of the circuit breaker for wiring which concerns on the 1st Embodiment of this invention. It is a top view which shows the state which removed the cover body with a surge from the circuit breaker for wiring which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the cover body with surge in FIG. 1, (A) is a figure which shows the state which looked at the cover body with surge from the arrow A direction in FIG. 1, (B) is with surge It is a sectional side view of a cover body. It is a top view of the circuit breaker for wiring which concerns on the 1st Embodiment of this invention. It is a circuit block diagram of the circuit breaker for wiring which concerns on the 1st Embodiment of this invention. It is a disassembled perspective view of the circuit breaker for wiring which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the cover body with a surge in FIG. 6, (A) is a figure which shows the state which looked at the cover body with a surge from the arrow B direction in FIG. 6, (B) is with a surge. It is a figure which shows the state which looked at the cover body from the arrow C direction in (A). It is a figure which shows the modification of this invention, and is a circuit block diagram of the circuit breaker for wiring at the time of providing a surge absorber and a capacitor | condenser as a surge absorption component on a board | substrate.

Explanation of symbols

10, 60 ... Circuit breaker for wiring 30 ... Power supply terminal (terminal on the power supply side)
31 ... Load terminal (Load side terminal)
35, 70 ... External electrode 38, 74 ... Connection terminal part 42, 81 ... Cover member 58 ... Surge absorbing component

Claims (3)

In the circuit breaker for wiring, which has terminals on the power supply side and load side, and automatically shuts off the wiring path in case of overload or short circuit,
An external electrode that is electrically connected to the terminal and has a connection terminal portion that inputs and outputs power to the outside;
A surge absorbing component electrically connected to both the terminal and the connection terminal portion;
A cover member that is movable in a sliding manner in the vicinity of the terminal;
Have
The surge absorbing component is held on the cover member, the cover member is slid, and the surge absorbing component is interposed between the terminal and the connecting terminal portion in a state where electricity can be passed. Circuit breaker.   A plurality of the terminals are provided on each of the power supply side and the load side, the connection terminal portion is provided so as to correspond to each terminal in the plurality of terminals, and the surge absorbing component is provided so as to correspond to each terminal. The plurality of surge absorbing parts are interposed between the pair of terminals and the connection terminal portion in an energized state when a plurality of the cover members are held and the cover member is slid. The circuit breaker described.   3. The circuit breaker according to claim 1, wherein the external electrode forms a single power line connecting the connection terminal portion and the terminal.

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