JP2020004496A - Wire connection instrument and electric apparatus - Google Patents

Abstract

To provide a technique capable of identifying whether a connection with a contact part is rightly completed even in several kinds of ferrule terminals of different lengths.SOLUTION: A wire connection instrument comprises: a terminal cover (housing) 10 including a wire insertion port 11 into which a ferrule terminal 51 fitted to a wire 50 is inserted; a contact part 23d disposed in an insertion direction of the ferrule terminal 51 inside of the terminal cover 10; a leaf spring (elastic member) 21 for pressing the ferrule terminal 51 which is inserted into the terminal cover 10 through the wire insertion port 11, to the contact part 23d with an elastic force; an inserted terminal positioning part 35a for positioning the ferrule terminal 51 which is inserted into the terminal cover 10 through the wire insertion port 11, in the insertion direction; and a positioning state display part 41 capable of displaying a state where the ferrule terminal 51 is positioned by the inserted terminal positioning part 35a, correspondently to several kinds of ferrule terminals 51 (51a and 51b) of different lengths.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an electric wire connection device and an electric device, and more particularly to a technology effective when applied to an electric wire connection device into which a ferrule terminal crimped to an electric wire is inserted and an electric device including the same.

  2. Description of the Related Art In recent years, in electric devices such as a circuit breaker and an electromagnetic contactor, for example, as disclosed in Patent Document 1, by inserting a wire into a wire insertion port of a housing, the holding of the wire and the electrical A spring terminal is used to complete the connection. The spring terminal mainly includes a terminal plate having a contact portion, and an elastic member for pressing an electric wire inserted into the housing through the electric wire insertion port against the contact portion with an elastic force.

Japanese Patent No. 5539809

By the way, in connecting the electric wire to the spring terminal, a ferrule terminal crimped to the electric wire may be used. The connection of the ferrule terminal to the contact portion is completed by being pressed against the contact portion by the elastic force of the elastic member.
However, since the connection between the ferrule terminal and the contact portion is performed inside the housing, it has been difficult to identify whether the connection between the ferrule terminal and the contact portion has been correctly completed. In particular, since the length of the ferrule terminal varies depending on the thickness of the electric wire, it is important to identify whether or not the connection between the ferrule terminal and the contact portion has been correctly completed.

  An object of the present invention is to provide a technique capable of identifying whether or not connection with a contact portion is correctly completed even with several types of ferrule terminals having different lengths.

In order to achieve the above object, an electric wire connection device according to one embodiment of the present invention includes a housing having an electric wire insertion port into which a ferrule terminal attached to an electric wire is inserted, and a ferrule terminal insertion direction inside the housing. A contact portion disposed along the wire, an elastic member that presses the ferrule terminal inserted through the wire insertion port into the housing with an elastic force against the contact portion, and a ferrule terminal inserted through the wire insertion port inside the housing. An insertion terminal positioning part for determining the position in the insertion direction, and a positioning state display part capable of displaying a state in which the ferrule terminal is positioned by the insertion terminal positioning part corresponding to several types of ferrule terminals having different lengths. I have.
Further, an electric device according to one embodiment of the present invention includes the electric wire connection device.

  According to the electric wire connecting device of one embodiment of the present invention, it is possible to identify whether or not the connection with the contact portion has been correctly completed even for several types of ferrule terminals having different lengths.

It is a perspective view showing the appearance of the circuit breaker concerning one embodiment of the present invention. It is a perspective view showing the appearance of the connecting device for electric wires concerning one embodiment of the present invention. FIG. 3 is an exploded perspective view showing a terminal cover and a terminal module of the electric wire connection device. FIG. 3 is an exploded perspective view showing a terminal block, a terminal plate, and an elastic member of the terminal module. It is a top view of a terminal block. FIG. 6 is a perspective view illustrating a cross-sectional structure along the line II-II in FIG. 5. It is a top view of a terminal module. FIG. 8 is an essential part cross-sectional view showing a cross-sectional structure along a line III-III in FIG. 7. It is principal part sectional drawing which shows the state which inserted the 1st ferrule terminal in the electric wire insertion space part of the electric wire connection device. It is principal part sectional drawing which shows the state which connected the 2nd ferrule terminal to the electric wire insertion space part of the electric wire connection tool. It is a perspective view which shows the 1st and 2nd ferrule terminal to which the electric wire was connected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the drawings are schematic and may differ from actual ones. Further, the following embodiments are intended to exemplify apparatuses and methods for embodying the technical idea of the present invention, and do not limit the configuration to the following. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.
In the following embodiment, an example in which the present invention is applied to an electric wire connection device attached to a circuit breaker as an electric device will be described.
In the following embodiments, in three directions that are orthogonal to each other in space, a first direction and a second direction that are orthogonal to each other in the same plane are respectively defined as an X direction and a Y direction, and a first direction and a second direction are defined. A third direction orthogonal to each of the directions is defined as a Z direction.

≪Circuit breaker≫
Although not shown, the circuit breaker 1 shown in FIG. 1 has a three-pole main circuit contact and an overcurrent trip device that operates the main circuit contact to a trip state when an overcurrent flows after a short circuit or the like. And a toggle link mechanism for opening and closing the main circuit contacts.
In the circuit breaker 1, one end in the X direction is a power supply side (primary side or line side), and the other end in the X direction is a load side (secondary side or load side). At one end of the circuit breaker 1 in the X direction, a wire connecting device 2A is detachably attached to a three-pole power-supply-side contact terminal (screw terminal). At the other end of the circuit breaker 1 in the X direction, an electric wire connecting device 2B having the same structure as the electric wire connecting device 2A is detachably attached to a three-pole load-side contact terminal (screw terminal). .

A lever opening 3 is provided on the upper surface of the circuit breaker 1 in the Z direction, and an operation lever 4 for operating the toggle link mechanism protrudes from the lever opening 3 to the outside.
As shown in FIG. 1, when the operating lever 4 projects at one end in the longitudinal direction of the lever opening 3, the toggle link mechanism closes the main circuit contact (ON position). When the operation lever 4 projects at the other end of the lever opening 3 in the longitudinal direction, the toggle link mechanism opens the main circuit contact (OFF position).

≪Connectors for electric wires≫
As shown in FIGS. 2 and 3, the power-supply-side electric wire connection device 2 </ b> A includes a terminal cover 10 as a housing, and a terminal module 20 attached to the terminal cover 10. As shown in FIG. 8, the power supply-side electric wire connection device 2A includes a terminal plate 23 having a contact portion 23d, a first leaf spring 21 as an elastic member, an insertion terminal positioning portion 35a, and a first positioning portion 35a. A status display unit 41 is further provided. The terminal board 23 and the first leaf spring 21 hold the ferrule terminal 51 by inserting the ferrule terminal 51 attached to the electric wire 50 from the first wire insertion port 11 of the terminal cover 10 into the terminal cover 10. A spring terminal that completes electrical connection with the ferrule terminal 51 is configured. Since the connecting device 2B for the electric wire on the load side has the same structure as the connecting device 2A for the electric wire on the power supply side, the description of the connecting device 2B for the electric wire on the load side is omitted.

≪Terminal module≫
As shown in FIGS. 3 and 4, the terminal module 20 includes three first leaf springs 21, three second leaf springs 22 having different sizes from the first leaf springs 21, and three A terminal plate 23 and a terminal block 30 are provided.

{First and second leaf springs}
The first leaf spring 21 is, for example, a flexible metal member obtained by processing a band-shaped metal plate into a predetermined shape. As shown in FIG. 4, the first leaf spring 21 has a flat fixing portion 21a, and a flat V-shaped connecting portion connected to a longitudinal end of the fixing portion 21a through a bent portion 21b. And a holding portion 21c.
The second leaf spring 22 is, for example, a flexible metal member obtained by processing a band-shaped metal plate having the same shape and small size as the first leaf spring 21 into a predetermined shape. Similarly to the first leaf spring 21, the second leaf spring 22 has a flat fixing portion 22a and a flat plate connected to a longitudinal end of the fixing portion 22a in a substantially V-shape via a bent portion 22b. Holding portion 22c.

≪Terminal board≫
Terminal board 23, as shown in FIG. 4, a screw connection 23a to the screw hole 23a ₁ is provided, a first conductor portion 23b that is bent at a right angle from the screw connection 23a, a screw connection from the first conductor portion 23b A second conductor portion 23c that is bent at a right angle in a direction parallel to and away from the portion 23a, and a second conductor portion 23c that is bent at a right angle away from the second conductor portion 23c so as to face in parallel with the first conductor portion 23b. And a contact portion 23d. The screw connection portion 23a is connected to a contact terminal on the main circuit side of the circuit breaker 1 by screw fixing.

≪Terminal block≫
The terminal block 30 is formed mainly of an insulating material such as a resin. 4 and 5, the terminal block 30 includes a first block 30a, a second block 30b, and a third block 30c arranged in a line in the Y direction.
Each of the first to third blocks 30a to 30c includes a first electric wire insertion space portion 31 and a second electric wire insertion space portion 32 arranged adjacent to each other in the Y direction. Each of the first and second electric wire insertion spaces 31 and 32 has a front wall 34a and a rear wall 34b whose walls are opposed to each other in the X direction and is separated from each other in the Y direction. It is surrounded by two side walls 34c and 34d connected to the front wall 34a and the rear wall 34b, respectively. In each of the first and second electric wire insertion spaces 31, 32, each of the four walls (front wall 34a, rear wall 34b, side walls 34c and 34d) with the wall faces mainly in the Z direction. An inner wall 35 is provided.

  As shown in FIG. 6, the inner wall 35 of the first wire insertion space 31 is inclined such that the first wire insertion space 31 gradually widens from the rear wall 34b toward the front wall 34a. The front end of the inner wall 35 on the front wall 34a side is configured as a planar insertion terminal positioning portion 35a extending in the X direction, as will be described later in detail. The inner wall 35 of the second wire insertion space 32 has the same configuration as the inner wall 35 of the first wire insertion space 31.

≫Installation of leaf spring and terminal board≫
As shown in FIG. 4, a first leaf spring 21, a second leaf spring 22, and a terminal plate 23 are mounted on each of the first to third blocks 30a to 30c. Since the first leaf spring 21, the second leaf spring 22, and the terminal board 23 have the same arrangement in each of the first to third blocks 30a to 30c, the first leaf spring 21, the second leaf spring 22 The arrangement of the terminal plate 23 will be described using the first block 30a as an example, and the description of the second block 30b and the third block 30c will be omitted.

  As shown in FIG. 8, a first leaf spring 21 and a terminal plate 23 are mounted in the first wire insertion space 31 of the first block 30a. In the terminal plate 23, the screw connection portion 23a and the first conductor portion 23b are located outside the first wire insertion space portion 31, the second conductor portion 23c is located outside the first wire insertion space portion 31, and the contact portion 23d is disposed in the first electric wire insertion space 31 so as to extend in the Z direction passing between the front wall 34a and the insertion terminal positioning portion 35a. The first leaf spring 21 is configured such that the fixing portion 21a is inserted between the first conductor portion 23b of the terminal plate 23 and the rear wall 34b, the upper portion of the rear wall 34b is positioned inside the curved portion of the bent portion 21b, 21c is disposed so as to cross the first wire insertion space 31.

The second leaf spring 22 and the terminal plate 23 are mounted in the second wire insertion space 32 of the first block 30a. Although not shown in detail, the terminal plate 23 and the second leaf spring 22 are disposed in the second electric wire insertion space 32 in the same manner as the first electric wire insertion space 31.
In the second and third blocks 30b and 30c, the first leaf spring 21, the second leaf spring 22, and the terminal plate 23 are mounted in the same arrangement as the first block 30a.

≪Terminal cover≫
As shown in FIGS. 2, 3 and 7, the terminal cover 10 has a front wall 10a whose wall faces in the X direction, and each wall faces each other in the Y direction to face each other, and each has a front wall 10a. There are provided two side walls 10c and 10d connected to each other, and a top wall 10e connected to each of the front wall and the two side walls with the wall faces in the Z direction, and these front wall 10a and two side walls 10c are provided. , 10d and the terminal block 30 are housed in a space surrounded by the upper wall 10e.
The terminal cover 10 includes a first wire insertion port 11 and a second wire insertion port 12. The first wire insertion port 11 and the second wire insertion port 12 are provided for each of the first to third blocks 30a, 30b, 30c of the terminal block 30, and are arranged along the Y direction. Further, the terminal cover 10 includes a tool insertion hole 13 provided at a position close to the X direction corresponding to the first wire insertion port 11 and the second wire insertion port 12.

  As shown in FIG. 8, the first wire insertion port 11 extends from the upper surface wall 10 e of the terminal cover 10 along the Z direction, is connected to the inside of the terminal cover 10, and is housed inside the terminal cover 10. The terminal block 30 is connected to the first wire insertion space 31 of the terminal block 30. The holding portion 21c of the first leaf spring 21, the contact portion 23d of the terminal plate 23, and the insertion terminal positioning portion 35a are arranged on an extension of the first wire insertion port 11 in the Z direction. The contact portion 23d of the terminal plate 23 is arranged inside the terminal cover 10 along the insertion direction (Z direction) of the ferrule terminal 51 inserted through the first wire insertion port 11. The first leaf spring 21 presses the ferrule terminal 51 inserted through the first wire insertion port 11 into the terminal cover 10 against the contact portion 23d with an elastic force. The insertion terminal positioning portion 35a positions the ferrule terminal 51 inserted through the first wire insertion port 11 into the terminal cover 10 in the insertion direction (Z direction).

Although not shown in detail, the second wire insertion port 12 extends in the Z direction from the upper surface wall 10e of the terminal cover 10 like the first wire insertion port 11, and is connected to the inside of the terminal cover 10. And is connected to the second wire insertion space 32 of the terminal block 30 housed inside the terminal cover 10. Then, on the extension line in the Z direction of the second electric wire insertion port 12, similarly to the first electric wire insertion port 11, the holding portion 22c of the second leaf spring 22, the contact portion 23d of the terminal plate 23, and the insertion terminal positioning portion 35a. Is arranged.
The first wire insertion port 11 and the second wire insertion port 12 have a structure in which a part of each upper part is connected and each lower part is separated. The first wire insertion port 11 and the second wire insertion port 12 are separated from the other adjacent first wire insertion port 11 and the second wire insertion port 12 via a partition wall 14.

<< ferrule terminal >>
As shown in FIGS. 11A and 11B, ferrule terminals 51 are attached to the electric wires 50 inserted into the first and second electric wire insertion ports 11 and 12 by crimping. The ferrule terminal 51 is a bar-shaped crimp terminal for preventing stranded wires (scattering) and stabilizing the quality of electrical connection. The ferrule terminal 51 includes, but is not limited to, a rod-shaped terminal portion 52 and a color portion 53 connected to the terminal portion 52. The ferrule terminal 51 has a base end 53a at the end of the collar portion 53 on the electric wire side.

  The entire length of the ferrule terminal 51 changes depending on the thickness of the electric wire 50. For example, as shown in FIGS. 11A and 11B, in electric wires 50a and 50b having different thicknesses (diameter D1 <diameter D2), the entire length L2 of the ferrule terminal 51b of the thick electric wire 50b is equal to the ferrule of the thin electric wire 50a. It is often longer than the entire length L1 of the terminal 51a. Further, even in the case of the thin electric wire 50a, there is a case where the overall length L1 of the ferrule terminal 51a is long.

<< Positioning status display section >>
As shown in FIGS. 2 and 7, the terminal cover 10 has a first positioning state display section 41 and a second positioning state display section 42 provided corresponding to the first wire insertion port 11 and the second wire insertion port 12. Is further provided. The first positioning state display section 41 can display the state in which the ferrule terminal 51 is positioned by the insertion terminal positioning section 35a in correspondence with several types of ferrule terminals 51 having different lengths. In this embodiment, the first positioning state display section 41 is capable of displaying the ferrule terminals 51a and 51b having different lengths as shown in FIGS. 11 (a) and 11 (b). I have. In addition, the first positioning state display section 41 is configured by three or more surfaces provided on the terminal cover 10 so that the distance from the insertion terminal positioning section 35a is different in the insertion direction (Z direction) of the ferrule terminal 51. ing. In this embodiment, the first positioning state display unit 41 is not limited to the terminal cover 10 as shown in FIGS. 2 and 7 to 10 corresponding to the ferrule terminals 51a and 51b having different lengths. The first and second surfaces 43a, 43b, and 43c are provided so that the distance from the insertion terminal positioning portion 35a is different in the insertion direction (Z direction) of the ferrule terminals 51a and 51b. ing. The first to third surfaces 43a, 43b, 43c are orthogonal to the insertion direction of the ferrule terminals 51a, 51b.

Further, as shown in FIG. 9, the first positioning state display section 41 has the base end 53a of the ferrule terminal 51a and the first surface 43a and the second surface 43a in a state where the ferrule terminal 51a is positioned by the insertion terminal positioning section 35a. The height of the step S1 is set so as to be arranged between the surface 43b. Further, as shown in FIG. 10, the first positioning state display section 41 is configured such that the base end 53a of the ferrule terminal 51b is in contact with the second surface 43b and the third surface 43b while the ferrule terminal 51b is positioned by the insertion terminal positioning section 35a. The height of the step S2 is set so as to be disposed between the surface 43c.
The second positioning state display unit 42 has the same configuration as the first positioning state display unit 41.

<< Effects of the Embodiment >>
When the electric wire 50a is inserted into the first electric wire insertion port 11 and the ferrule terminal 51a shown in FIG. 11A is inserted into the terminal cover 10, the terminal 50 is pushed into the terminal portion 52 of the ferrule terminal 51a as shown in FIG. Then, the first leaf spring 21 is elastically deformed. When the terminal portion 52 of the ferrule terminal 51a is inserted between the holding portion 21c of the first leaf spring 21 and the contact portion 23d of the terminal plate 23, the terminal force of the ferrule terminal 51a is generated by the elastic force of the first leaf spring 21. The portion 52 is pressed against the contact portion 23d, and the displacement in the pull-out direction is suppressed.
At this time, the tip of the terminal portion 52 of the ferrule terminal 51a contacts the insertion terminal positioning portion 35a, and the ferrule terminal 51a is positioned in the insertion direction (Z direction) at this position. As a result, the connection between the ferrule terminal 51a and the contact portion 23d is correctly completed.

  Also, at this time, the first positioning state display section 41 displays the base end 53a of the ferrule terminal 51a between the first surface 43a and the second surface 43b while the ferrule terminal 51a is positioned by the insertion terminal positioning portion 35a. Since the height of the step S1 is set so as to be arranged between the first surface 43a and the second surface 43b, the base end 53a of the ferrule terminal 51a is projected. Therefore, whether or not the connection between the ferrule terminal 51a and the contact portion 23d is correctly completed can be visually identified. That is, when the base end 53a of the ferrule terminal 51a is located between the first surface 43a and the second surface 43b, the connection between the ferrule terminal 51a and the contact portion 23d is correctly completed within a predetermined allowable range. When the base end 53a of the ferrule terminal 51a protrudes from the second surface 43b, it indicates that the connection between the ferrule terminal 51a and the contact portion 23d is not correctly completed.

On the other hand, when the electric wire 50b is inserted into the first electric wire insertion port 11 and the ferrule terminal 51b of FIG. 11B is inserted into the terminal cover 10, as shown in FIG. The first leaf spring 21 is elastically deformed. When the terminal portion 52 of the ferrule terminal 51b is inserted between the holding portion 21c of the first leaf spring 21 and the contact portion 23d of the terminal plate 23, the terminal force of the ferrule terminal 51b is generated by the elastic force of the first leaf spring 21. The portion 52 is pressed against the contact portion 23d, and the displacement in the pull-out direction is suppressed.
At this time, the tip of the terminal portion 52 of the ferrule terminal 51b contacts the insertion terminal positioning portion 35a, and the ferrule terminal 51b is positioned in the insertion direction (Z direction) at this position. Thereby, the connection between the ferrule terminal 51b and the contact portion 23d is correctly completed.

  Also, at this time, the first positioning display section 41 indicates that the base end 53a of the ferrule terminal 51b is positioned between the second surface 43b and the third surface 43c with the ferrule terminal 51b positioned by the insertion terminal positioning portion 35a. The height of the step S2 is set so that the ferrule terminal 51b is disposed at a position between the second surface 43b and the third surface 43c. Therefore, whether or not the connection between the ferrule terminal 51b and the contact portion 23d is correctly completed can be visually identified. That is, when the base end 53a of the ferrule terminal 51b is located between the second surface 43b and the third surface 43c, the connection between the ferrule terminal 51b and the contact portion 23d is correctly completed within a predetermined allowable range. When the base end 53a of the ferrule terminal 51b protrudes from the third surface 43c, it indicates that the connection between the ferrule terminal 51b and the contact portion 23d is not correctly completed.

From the above, the first positioning state display section 41 can visually identify whether the connection with the contact section 23d is correctly completed even in the two types of ferrule terminals 51a and 51b having different lengths. it can.
Further, it is not necessary to add a new component as described above, and it is possible to easily identify whether or not the ferrule terminals 51a and 51b and the contact portion 23d are correctly completed with a simple structure.
When the ferrule terminals 51a and 51b are inserted into the first wire insertion port 11, the first spring 21 is elastically deformed by being pushed by the ferrule terminals 51a and 51b. When the ferrule terminals 51a, 51b are inserted between the holding portion 21c of the first leaf spring 21 and the contact portion 23d, the ferrule terminals 51a, 51b are pressed against the contact portion 23d by the elastic force of the first leaf spring 21. And the displacement in the pulling-out direction is suppressed. Therefore, loosening and falling off of the ferrule terminals 51a and 51b can be suppressed.

On the other hand, when the tool is inserted into the tool insertion hole 13, the first leaf spring 21 is elastically deformed by being pushed by the tool, and the ferrule terminals 51 a and 51 b are released from the elastic force of the first leaf spring 21. As described above, the ferrule terminals 51a and 51b can be easily pulled out by using the tool.
In the second positioning state display section 42, the same effect as in the first positioning state display section 41 can be obtained.
Note that, in the above-described embodiment, the first and second positioning state display sections 41 and 42 correspond to the three surfaces 43a, 43b and 43c (two steps S1 and S2) corresponding to the two ferrule terminals 51a and 51b having different lengths. Although the case of S2) has been described, when corresponding to three or more ferrule terminals having different lengths, the first and second positioning state display portions 41 and 42 are provided with four or more surfaces (three steps). It consists of.

Further, in the above-described embodiment, the case where the first and second positioning state display sections 41 and 42 are configured with three or more surfaces (two or more steps) has been described. The part may be composed of three or more grooves.
Further, in the above-described embodiment, the case where the present invention is applied to the electric wire connecting devices 2A and 2B attached to the circuit breaker 1 has been described, but the present invention is not limited to this. The present invention can also be applied to an electromagnetic contactor as an electric device, an auxiliary switch of a terminal block type as an accessory, a warning switch of a terminal block type, and the like.

  As described above, the present invention has been specifically described based on the above-described one embodiment. However, the present invention is not limited to the above-described one embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention. .

1. Circuit breaker (electrical equipment)
2A, 2B ... electric wire connecting device 3 ... lever opening 4 ... operation lever 10 ... terminal cover 10a ... front wall, 10c, 10d ... side wall, 10e top wall 11 ... first electric wire insertion port 12 ... second electric wire insertion port DESCRIPTION OF SYMBOLS 13 ... Tool insertion hole 14 ... Partition wall 20 ... Terminal module 21 ... 1st leaf spring 21a ... Fixed part, 21b ... Bending part 21b, 21c ... Holding part 22 ... Second leaf spring 22a ... Fixed part, 21b ... Bending part, 22c ... holding part 23 ... terminal plate 23a ... connection part, 23a ₁ ... screw hole, 23b ... first conductor part, 23c ... second conductor part, 23d ... contact part 30 ... terminal block 30a-30b ... first-third block DESCRIPTION OF SYMBOLS 31 ... 1st electric wire insertion space part 32 ... 2nd electric wire insertion space part 34a ... Front wall 34b ... Back wall 34c, 34d ... Side wall 35 ... Inner wall 35a ... Insertion terminal positioning part 41 ... 1st positioning state Radical 113 42 ... second positioning state display section 43a ... first surface 43 b ... second surface 43c ... third surface

Claims (6)

A housing having a wire insertion port into which a ferrule terminal attached to the wire is inserted;
A contact portion disposed inside the housing along the insertion direction of the ferrule terminal;
An elastic member that presses the ferrule terminal inserted through the wire insertion port into the housing with an elastic force against the contact portion;
An insertion terminal positioning unit that determines a position in the insertion direction of the ferrule terminal inserted through the wire insertion port inside the housing,
A positioning state display unit capable of displaying a state in which the ferrule terminal is positioned by the insertion terminal positioning unit in correspondence with several types of the ferrule terminals having different lengths,
A connection device for electric wires, comprising:   2. The positioning state display section, wherein the housing is configured with three or more surfaces provided so as to be different in distance from the insertion terminal positioning section in the insertion direction. 3. The connecting device for an electric wire according to the above.   3. The electric wire connection device according to claim 2, wherein the positioning state display unit is configured by two or more steps defined by the three or more surfaces. 4.   3. The electric wire connection device according to claim 2, wherein the three or more surfaces are displaced in a direction orthogonal to the insertion direction of the ferrule terminal. 4.   The insertion terminal positioning portion is provided at a position facing the tip of the ferrule terminal inserted through the wire insertion port inside the housing, and is positioned when the tip of the ferrule terminal abuts. The electric wire connection device according to any one of claims 1 to 4, wherein   An electric device comprising the electric wire connecting device according to any one of claims 1 to 5.

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