JP2017016767A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a circuit breaker that is highly reliable in electric wire connection, is excellent in workability, and uses a binding terminal unit.SOLUTION: A circuit breaker according to the invention comprises: a housing 1f comprising a power-source-side terminal plate 2a with a screw hole formed therein, and a load-side terminal plate 2b with a screw hole formed therein, and having an operation panel 1a on one face; and a binding terminal unit 3, by which composing members for a binding terminal that is able to connect an electric wire 7 are formed into a unit, and which has an electric wire insertion hole 3a in a first face and also has a connection face on a second face in order to electrically connect to the power-source-side terminal plate 2a or the load-side terminal plate 2b. A connection face 4c is layered on the power-source-side terminal plate 2a or the load-side terminal plate 2b. A fixed screw 8 is inserted from the power-source-side terminal plate 2a or the load-side terminal plate 2b, thereby connecting the power-source-side terminal plate 2a or the load-side terminal plate 2b and the connection face 4c.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to a circuit breaker provided with a quick connection terminal connection that allows easy installation and removal of electric wires.

  As a means for connecting an electric wire to a circuit breaker, a method of forming a screw hole in a terminal plate and fixing a crimp terminal connected to the electric wire using a terminal screw is generally used. There is also known a connection method that uses a fast connection terminal instead of a terminal plate that does not require the use of screws and does not require management of tightening torque and can be mounted and removed in a short time.

  Further, for example, as shown in FIG. 1 of Patent Document 1, instead of forming and using a quick connection terminal in place of the terminal plate of the circuit breaker, the quick connection terminal and peripheral members are combined in a unit form to form a quick connection. A method of constituting a terminal unit and fixing it to a terminal plate to which an electric wire is connected is also known.

Japanese Patent No. 3433361 (FIG. 1)

  In such a conventional circuit breaker, a terminal screw for fixing an electric wire to the terminal plate of the circuit breaker is used as a fixing screw of the quick connection terminal unit, and a quick connection terminal is formed in a screw hole formed in the terminal plate. Secure the unit. In other words, a screw hole that matches the size of the terminal screw is formed on the terminal board of the circuit breaker, while the insertion is slightly larger than the terminal screw on the connection surface of the quick-connection terminal unit that forms an electric circuit with the circuit breaker. Create a hole. And the connection surface of a quick connection terminal unit is piled up on the terminal board of a circuit breaker, and it fixes using a fixing screw from the upper part.

  At this time, the screw head of the fixing screw becomes the operation surface side of the circuit breaker, and the fixing screw may be loosened accidentally by work performed from the operation surface side, for example, fixing the circuit breaker to the operation panel, etc. Conceivable. If the fixing screw that fixes the quick connection terminal unit to the circuit breaker is loosened, sufficient contact pressure between the circuit breaker terminal plate and the connection surface of the quick connection terminal unit cannot be obtained, and heat is generated during energization. Could have occurred.

  Also, if you try to prohibit the wrong operation of the fixing screw while maintaining the connection structure of this quick connection terminal unit, it is necessary to cover the screw head with a new member such as a cover or to bond the fixing screw with an adhesive or the like There was an increase in cost and workability.

  This invention was made to solve the above-described problems, and prevents the quick connection terminal unit attached to the terminal board of the circuit breaker from being accidentally removed or loosening the fixing screw. It is possible to prevent heat generation during energization that occurs because a sufficient bonding pressure cannot be obtained between the connection surface of the quick connection terminal unit and the terminal plate of the circuit breaker.

  A circuit breaker according to the present invention includes a power-side terminal plate formed with screw holes and a load-side terminal plate formed with screw holes, a housing having an operation surface plate on one surface, and a quick-connect terminal capable of connecting an electric wire. The component member is unitized, and a quick connection terminal unit having a wire insertion hole on the first surface and a connection surface electrically connected to the power supply side terminal plate or the load side terminal plate on the second surface, Laminate the connection surface on the power supply side terminal board or load side terminal board, and insert the fixing screw from the power supply side terminal board or load side terminal board side to connect the power supply side terminal board or load side terminal board and the connection surface. Is fixed.

  According to the circuit breaker of the present invention, the fast connection terminal unit is fixed to the circuit breaker by inserting a fixing screw from the bottom surface side of the circuit breaker body. In this state, the fixing screw cannot be operated, and the fixing screw cannot be loosened by mistake. Therefore, heat generation during energization can be prevented, and the production of a cover for covering the screw head for prohibiting the operation of the fixing screw, the bonding of the fixing screw, and the like become unnecessary.

It is sectional drawing of the circuit breaker which concerns on this invention. It is an outline view (operation side) of a circuit breaker concerning the present invention. It is an external view (the power source side end surface side) of the circuit breaker according to the present invention. It is a 3rd page figure of the quick connection terminal unit which concerns on this invention. It is sectional drawing (detection hole part) of the quick connection terminal unit which concerns on this invention. It is sectional drawing (release operation hole part) of the quick connection terminal unit which concerns on this invention. It is sectional drawing which shows operation | movement of the electric wire unlocking lever of the quick connection terminal unit which concerns on this invention. It is sectional drawing of the circuit breaker which concerns on this invention.

  In the description of the embodiments and the respective drawings, the portions denoted by the same reference numerals indicate the same or corresponding portions.

Embodiment 1 FIG.
<Structure of circuit breaker>
1-3 show the structure of the circuit breaker 1 in this invention. 1 is a cross-sectional view of a circuit breaker 1 according to the present invention in a direction connecting a power supply side terminal plate 2a and a load side terminal plate 2b. FIG. 2 is an external view of the circuit breaker 1 observed from the operation surface side. These are the external views observed from the direction of the power supply side terminal. 4 to 7 show the structure of the quick connection terminal unit 3. FIG. 4 is a three-side view of the quick connection terminal unit 3. FIG. 5 is a cross-sectional view of the quick connection terminal unit 3 in the direction including the detection hole 3b. 6 is a cross-sectional view in a direction including the release operation hole 3c, and FIG. 7 is a cross-sectional view showing an operation when the electric wire unlocking lever 6 is operated. Here, the quick connection terminal unit 3 is a unit in which a quick connection terminal that can easily attach and detach an electric wire without using a screw or the like and a peripheral member thereof are formed as a unit. It can be attached to the side terminal plate 2b as a unit.

  First, a schematic configuration of the circuit breaker 1 according to the present embodiment will be described using the cross-sectional view of the circuit breaker 1 shown in FIG. The operation surface portion of the circuit breaker 1 shown in the figure is called an operation surface plate 1a. Further, the right end surface of the housing 1f forming the circuit breaker 1 is called a power supply side end surface 1b, the left end surface is called a load side end surface 1d, and the surface opposite to the operation surface of the circuit breaker is called a bottom surface 1c of the housing. . A power-side terminal plate 2a is formed on the inner side of the power-side end surface 1b, and a load-side terminal plate 2b is formed on the inner side of the load-side end surface 1d. The power-side terminal plate 2a and the load-side terminal plate 2b The connection terminal unit 3 is fixedly attached with fixing screws 8 from the direction of the bottom surface 1c.

  A movable contact 9 for turning on / off the movable contact 10 and the fixed contact 11 is provided in the lower part near the center of the circuit breaker 1. In the present embodiment, a one-pole one-point-break contact configuration in which each of the movable contact 10 and the fixed contact 11 is one is used.

  A contact driving device 13 (portion surrounded by a broken-line circle) is formed on the upper portion of the contact made up of the movable contact 10 and the fixed contact 11, and the operation of the operation handle 14 is transmitted to the movable contact 9 so as to be movable. The contact 10 and the fixed contact 11 are turned on / off. An arc extinguishing device 15 for extinguishing an arc generated when the contact is cut off is formed in the right portion of the drive device 13 in a short time, and when an overcurrent is applied to the left portion, etc. A tripping device 16 (a portion surrounded by an alternate long and short dash line) for interrupting the movable contact 10 and the fixed contact 11 is provided.

  FIG. 2 is an external view of the circuit breaker 1 as viewed from the operation surface side. Three portions are formed on each of the right and left sides of the circuit breaker, and cut portions are formed in the operation surface plate 1a. The load side terminal plate 2b can be observed. In addition, the state where the quick connection terminal unit 3 is attached to the power supply side terminal board 2a and the load side terminal board 2b of the lowermost incision part among the right side and left side cuts is shown.

  FIG. 3 is an external view of the circuit breaker 1 and shows a state observed from the direction of the power supply side end face 1b. Three power supply side terminal plates 2a are formed on the power supply side end surface 1b side, and the fast connection terminal unit 3 is attached to the leftmost power supply side terminal plate 2a. An exhaust port 1e is formed between the upper surface of the quick connection terminal unit 3 and the operation face plate 1a of the circuit breaker 1, and the effect of extinguishing the arc generated when the movable contact 10 and the fixed contact 11 are turned on / off is achieved. Has a function to enhance.

<Structure of quick connection terminal unit>
Next, the structure of the quick connection terminal unit 3 will be described. FIG. 4 is a three-side view of the quick connection terminal unit 3 and shows a state in which the quick connection terminal unit 3 is observed from three directions. The quick connection terminal unit 3 is externally covered with two cases 3d and 3e, and the two cases 3d and 3e are fixed with mounting screws 3f.

  The upper surface (first surface) of the quick connection terminal unit 3 is energized by an electric wire insertion hole 3a through which an electric wire is inserted and electrically connected to each of the terminal plates 2a and 2b, and a quick connection terminal electrode 4 formed therein. A detection hole 3b for examining whether or not an unlocking operation hole 3c for performing an unlocking operation for removing an electric wire connected to the power supply side terminal plate 2a and the load side terminal plate 2b is formed. The holes for performing these operations are all formed on the upper surface of the quick connection terminal unit 3, and can be operated from the direction of the operation surface of the circuit breaker 1, which is the opposite direction to which the fixing screw 8 is inserted. .

  FIG. 5 shows a cross-sectional view in a direction including the detection hole 3 b portion of the quick connection terminal unit 3. Inside the quick connection terminal unit 3, there are a wire contact portion 4a connected to the wire 7, a connection surface 4c connected to the power supply side terminal plate 2a or the load side terminal plate 2b, and a space between the wire contact portion 4a and the connection surface 4c. The quick connection terminal electrode 4 made of the conductive member 4b to be connected is disposed, and the connection surface 4c is located on the lower surface (second surface) of the quick connection terminal unit 3. A leaf spring 5 having a locking portion 5a for preventing the wire from being pulled out and a contact pressure portion 5b for holding the wire is also disposed. In the state where the quick connection terminal unit 3 is attached to the circuit breaker 1, the upper surface / lower surface of the quick connection terminal unit 3 corresponds to the operation surface / bottom surface of the circuit breaker 1, respectively.

  FIG. 6 shows a cross-sectional view of the quick connection terminal unit 3 in the direction including the wire unlocking lever 6. Moreover, FIG. 7 is sectional drawing of the direction containing the electric wire unlocking lever 6 of the quick connection terminal unit 3 like FIG. 6, and has shown the state by which the electric wire unlocking lever 6 is operated and the electric wire 7 is removed.

  The electric wire unlocking lever 6 has an unlocking operation portion 6a, a rotating shaft 6b, and a leaf spring operation portion 6c. When the unlocking operation portion 6a is pushed rightward from the unlocking operation hole 3c, the electric wire unlocking lever rotates clockwise about the rotation shaft 6b (in the direction of the arrow in FIG. 7). At this time, the leaf spring driving portion 6c lifts the locking portion 5a of the leaf spring 5 and separates the leaf spring 5 and the wire contact portion 4a. In this state, the electric wire 7 can be easily pulled out from the quick connection terminal unit 3.

<Characteristics of circuit breaker / fast-connection terminal unit>
In a normal circuit breaker 1, a fixing screw 8 is used to connect the electric wire 7 to the power supply side terminal plate 2a and the load side terminal plate 2b, and the electric wire is connected to the power supply side terminal plate 2a and the load side terminal plate 2b from above. 7 is screwed. However, in the present embodiment, as described above, the quick connection terminal unit 3 is arranged on the power supply side terminal plate 2a and the load side terminal plate 2b, and the fixing screw 8 is used from below to fix the power supply side. The terminal board 2a, the load side terminal board 2b, and the connection surface 4c of the quick connection terminal unit 3 are fixed.

  More specifically, screw holes are formed in the connection surface 4c of the quick connection terminal unit 3, the power supply side terminal plate 2a, and the load side terminal plate 2b. The screw holes of the power supply side terminal plate 2 a and the load side terminal plate 2 b are formed to be slightly larger than the diameter of the fixing screw 8. On the other hand, the screw hole of the connection surface 4 c is in a state where the screw is cut in accordance with the fixing screw 8. Therefore, when the fixing screw 8 is inserted from below, the power supply side terminal plate 2a and the load side terminal plate 2b are firmly sandwiched and fixed between the screw hole of the connection surface 4c and the fixing screw 8, and the power supply side terminal plate 2a and The load side terminal plate 2b and the connection surface 4c are electrically connected stably.

  The quick connection terminal unit 3 shown in the present embodiment corresponds to the connection of electric wires for one phase, and the power supply side terminal plate 2a of the circuit breaker 1 has the same shape. Can use the common quick connection terminal unit 3. Moreover, although the circuit breaker of 3 poles was shown in FIG. 1 etc., the circuit breaker 1 of 4 pole goods can be obtained from 1 pole goods.

  Since the load side terminal plate 2b of the circuit breaker 1 has the same shape as the power source side terminal plate 2a, the quick connection terminal unit 3 can be used in common for the load side terminal plate 2b and the power source side terminal plate 2a.

  In attaching the quick connection terminal unit 3, the quick connection terminal unit 3 is configured at a position lower than the operation face plate 1a of the circuit breaker 1, and from the power supply side end face 1b and the load side end face 1d of the housing 1f of the circuit breaker 1. It is configured not to protrude. Thereby, the circuit breaker 1 can be downsized.

  In addition, when the quick connection terminal unit 3 is attached to the circuit breaker 1, as shown in FIG. 3, it is generated at the contact portion of the circuit breaker 1 between the operation face plate 1a and the quick connection terminal unit 3. An exhaust port 1e is provided so as not to hinder the discharge of the arc.

<Effect of the circuit breaker of this embodiment>
As described above, since the circuit breaker 1 shown in the present embodiment fixes the quick-connection terminal unit 3 from the lower surface of the circuit breaker 1 using the fixing screw 8, the operation of the circuit breaker 1 can be performed. Compared with the structure in which the electric wire 7 is fixed with the fixing screw 8 from the operation surface side to be performed, the electric screw 7, the power supply side terminal plate 2a and the load side terminal plate 2b are always kept at a sufficient contact pressure without unintentionally loosening the fixing screw 8. Can be secured, and no heat is generated due to loosening of the fixing screw 8.

  Further, in the structure in which the electric wire 7 is fixed from the operation surface side using the fixing screw 8, in order to prevent the fixing screw 8 from loosening due to an error, a cover that covers the screw head is used, or the fixing screw 8 is bonded. However, these are unnecessary in the circuit breaker 1 of the present embodiment, and it is possible to prevent the cost increase and the workability from being lowered.

  In the circuit breaker 1 according to the present embodiment, since the power-side terminal plate 2a and the load-side terminal plate 2b are all the same size, the common quick-connection terminal unit 3 can be used. Since it has a structure that does not protrude from the power supply side end surface 1b and the load side end surface 1d of the circuit breaker 1 and is formed at a position lower than the operation surface 1a, it is possible to achieve downsizing and obtain a circuit breaker 1 of 1 pole product to 4 pole product. be able to.

  Furthermore, since the quick connection terminal unit 3 used in the circuit breaker 1 of the present embodiment has all of the electric wire insertion hole 3a, the detection hole 3b, and the unlocking operation hole 3c on the operation surface side, the upper operation surface Only by operation from the side, electric wire insertion, voltage detection, unlocking, etc. can be performed, and workability can be improved.

Embodiment 2. FIG.
The circuit breaker 17 described in the present embodiment has the same basic configuration as that of the circuit breaker 1 described in the first embodiment. The circuit breaker 17 described in the present embodiment is different between two sets of contacts, whereas the circuit breaker 17 described in the present embodiment is cut off between a pair of contacts.

  FIG. 8 shows a cross-sectional view of the circuit breaker 17 described in the present embodiment. In the present embodiment, a so-called one-pole two-point cutting structure including two sets of contacts is used. In the one-pole two-point cutting structure, a substantially cylindrical rotor 19 that rotates due to the movement of the operation handle 14 is disposed between the power supply side terminal plate 2a and the load side terminal plate 2b. A first movable contact 20 on the right side of the drawing and a second movable contact piece 21 on the left side of the drawing are provided at substantially diagonal positions of the cylindrical rotor 19. Further, a first movable contact 22 is formed in the vicinity of the distal end of the first movable contact 20, and a second movable contact 23 is formed in the vicinity of the distal end of the second movable contact 21 to constitute the rotating electrode 18. doing. On the other hand, a first fixed contact 24 is connected to the power supply side terminal plate 2a of the circuit breaker 17 body, and a first fixed contact 25 is formed on the surface. A second fixed contact 26 is connected to the load side terminal plate 2b, and a second fixed contact 27 is formed on the surface.

  When the rotor 19 rotates due to the movement of the operation handle 14, the first fixed contact 25 on the first fixed contact 24, the first movable contact 22 on the first movable contact 20, the second The second fixed contact 27 on the fixed contact 26 and the second movable contact 23 on the second movable contact 21 are simultaneously closed or opened. As a result, the current can be turned on / off between the power supply side terminal plate 2a and the load side terminal plate 2b.

  In the present embodiment, since one electrode two-point cutting structure is used to open and close two sets of electrodes, the structure is slightly more complicated than the circuit breaker 1 having one pole one-point cutting structure. And has the feature that it can be applied to high breaking capacity products. In addition, as for the effect of the invention shown in the first embodiment, even with the circuit breaker 17 having the one-pole two-point cut structure shown in the present embodiment, Similarly, loosening of the fixing screw 8 due to an error can be eliminated, heat generation can be prevented, and a circuit breaker 17 having good characteristics can be obtained.

  The circuit breaker 17 shown in the present embodiment and the circuit breaker 1 shown in the first embodiment have the same structure except for the contact structure. That is, it is the same in that the quick connection terminal unit 3 is fixed to the power supply side terminal plate 2a and the load side terminal plate 2b using the fixing screw 8 from below. Moreover, since the structure of the quick connection terminal unit 3 is also the same, the point that the electric wire insertion hole 3a, the electric detection port 3b, and the unlocking operation hole 3c are formed in the upper surface of the quick connection terminal unit 3 is also the same.

<Effect of the circuit breaker of this embodiment>
As described above, the circuit breaker 17 shown in the present embodiment fixes the quick-connection terminal unit 3 from the bottom surface of the circuit breaker 1 using the fixing screw 8. Compared with the structure in which the electric wire 7 is fixed with the fixing screw 8 from the operation surface side to be performed, the electric connection between the electric wire 7 and each of the terminal plates 2a and 2b is always performed with sufficient contact pressure without unintentionally loosening the fixing screw 8. It can be ensured, and heat generation due to loosening of the fixing screw 8 can be prevented.

  Further, in the structure in which the electric wire 7 is fixed from the operation surface side using the fixing screw 8, in order to prevent the fixing screw 8 from loosening due to an error, a cover that covers the screw head is used, or the fixing screw 8 is bonded. However, in the circuit breaker 17 of the present embodiment, these are unnecessary, and it is possible to prevent the cost increase and the workability deterioration.

  In the circuit breaker 17 of the present embodiment, since the power-side terminal plate 2a and the load-side terminal plate 2b are all the same size, the common quick-connection terminal unit 3 can be used, and the quick-connection terminal unit 3 is a circuit. Since it has a structure that does not protrude from the power supply side end surface 17b and the load side end surface 17d of the circuit breaker and is formed at a position lower than the operation surface plate 17a, it is possible to achieve downsizing and obtain a circuit breaker of 1 pole product to 4 pole product. it can.

  Furthermore, since the quick connection terminal unit 3 used for the circuit breaker 17 according to the present embodiment has the wire insertion hole 3a, the detection hole 3b, and the unlocking operation hole 3c all on the upper surface side, Wire insertion, voltage detection, unlocking, etc. can be performed only by operation, and workability can be improved.

  In addition to the above, the circuit breaker 17 according to the present embodiment uses a structure in which the contact structure is one-pole, two-point cut, so that it has excellent breaking characteristics and can be applied to a high breaking capacity product. Has features.

DESCRIPTION OF SYMBOLS 1 Circuit breaker, 1a Operation surface board, 1b Power supply side end surface, 1c Bottom surface, 1d Load side end surface, 1e Exhaust port, 1f Case, 2a Power supply side terminal plate, 2b Load side terminal plate, 3 Quick connection terminal unit, 3a Electric wire Insertion hole, 3b detection hole, 3c unlocking operation hole, 3d first case, 3e second case, 3f mounting screw, 4 quick connection terminal electrode, 4a wire contact part, 4b conductive member, 4c connection surface, 5 Leaf spring, 5a Locking part, 5b Contacting part, 6 Electric wire unlocking lever, 6a Unlocking operation part, 6b Rotating shaft, 6c Leaf spring driving part, 7 Electric wire, 8 Fixing screw, 9 Movable contact, 10 Movable contact , 11 fixed contact, 13 driving device, 14 operation handle, 15 arc extinguishing device, 16 trip device, 17 circuit breaker, 18 rotating electrode, 19 rotor, 20 first movable contact, 21 second movable contact 2 2 1st movable contact, 23 2nd movable contact, 24 1st fixed contact, 25 1st fixed contact, 26 2nd fixed contact, 27 2nd fixed contact

Claims (8)

A power supply side terminal plate formed with screw holes and a load side terminal plate formed with screw holes, and a housing having an operation face plate on one side;
The component of the quick connection terminal to which the electric wire can be connected is unitized, the electric wire insertion hole is formed on the first surface, and the connection surface that is electrically connected to the power supply side terminal plate or the load side terminal plate is connected to the second surface. A quick connection terminal unit,
The connection surface is laminated on the power supply side terminal plate or the load side terminal plate, and a fixing screw is inserted from the power supply side terminal plate or the load side terminal plate side to insert the power supply side terminal plate or the load. The circuit breaker characterized by fixing a side terminal board and the said connection surface.   2. The circuit breaker according to claim 1, wherein the quick connection terminal unit is fixed to the housing, and the quick connection terminal unit has no portion protruding from an outer shape of the housing.   The circuit breaker according to claim 1 or 2, wherein the quick connection terminal unit corresponds to connection for one phase and can be attached independently for each phase.   The circuit breaker according to any one of claims 1 to 3, wherein the quick connection terminal unit can be commonly attached to both the power supply side terminal plate and the load side terminal plate.   The circuit breaker according to any one of claims 1 to 4, wherein an electric wire is inserted into the electric wire insertion hole from the operation surface plate side.   The circuit breaker according to any one of claims 1 to 5, further comprising a detection hole for detecting electric current from the operation surface plate side.   The circuit breaker according to any one of claims 1 to 6, further comprising an electric wire release lever that operates the electric wire locking portion of the leaf spring from the operation face plate side.   The circuit breaker according to any one of claims 1 to 7, wherein an exhaust port is provided between the operation surface plate and the first surface of the quick connection terminal unit.

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