CN108232478B

CN108232478B - Electrical connection element with a through-penetration of the insulating sheath of an electrical wire

Info

Publication number: CN108232478B
Application number: CN201711259895.0A
Authority: CN
Inventors: F·巴多; C·勒克
Original assignee: Legron Partnership; Legrand SA
Current assignee: Legron Partnership; Legrand SA
Priority date: 2016-12-14
Filing date: 2017-12-04
Publication date: 2020-02-07
Anticipated expiration: 2037-12-04
Also published as: CN108232478A; FR3060215B1; DE102017127761A1; FR3060215A1

Abstract

The invention relates to an electrical connection element (1) having an insulating sheath penetration, formed by at least two distinct parts (5, 6) made of different electrically conductive materials, which delimit between them a slot (11) for inserting an electrical wire (2) having a sheath, the slot having a proximal portion (12) located on the mouth side of the slot, the width of which decreases towards the bottom (11C) of the slot, and at least one of its edges (12A, 12B) being made of a first material, and a distal portion (13) located on the bottom side of the slot, at least one of its two edges (13A, 13B), called the connection edge (13A), being made of a second material which is more electrically conductive than the first material. According to the invention, the slot has, between the proximal portion and the distal portion, an intermediate portion (14) delimited by two intermediate edges (14A) made of a material different from the second material; the connecting edge of the distal portion of the slot extends generally in the extension of one of the two intermediate edges of the intermediate portion of the slot, the other connecting edge (13B) of the distal portion being formed continuously with one of the intermediate edges.

Description

Electrical connection element with a through-penetration of the insulating sheath of an electrical wire

Technical Field

The present invention relates generally to the field of electrical devices, comprising so-called "electrical connection elements with penetration (piercing, passing) of insulating material" for automatically (without tools) connecting said devices to the electrical supply lines coming from the electrical network.

The invention relates more particularly to an electrical connection element with an insulating sheath penetration, consisting of at least two distinct parts made of different conductive materials, between which a slot for inserting an electrical conductor with a sheath is defined, the slot having:

a proximal portion, which is located on the mouth side of the slot, whose width decreases towards the bottom of the slot, and whose at least one edge is made of a first material,

a distal portion, located on the bottom side of the slot, at least one of its edges, called connecting edge, being made of a second material, which is more conductive than the first material.

The invention finds a particularly advantageous application in the production of electrical sockets or terminals for electrical switching devices, such as simple switches or multi-way switches.

Background

Generally, the electrical equipment is connected to the power source by connecting the three phase lines, hot, neutral and ground, to three terminals, respectively.

The fixing and connection of the sheathed wire can be achieved by a screw terminal which consists of a metal band screwed in by a screw. The screw allows the wire stripping end of the wire to be tightened onto the metal band to establish an electrical connection.

There is also a terminal with an insulation layer penetration portion including a metal body having a slit formed therein and a connecting rod. Terminals of this type are so-called "terminals with insulation penetrations", in which the swinging of a lever forces the wire into engagement through a slot, so that the edges of the slot cut the insulation sheath of the wire and establish an electrical connection with the wire.

In this particular case, it was found that the cutting of the insulating material is sometimes random, since the terminals may be deformed by the force of cutting the insulating sheath. In addition, the edges of the slots can become dull as the wires are connected and disconnected, so that they cannot successfully cut the insulating sheath to establish electrical connection.

Disclosure of Invention

In order to overcome the above mentioned drawbacks of the prior art, the present invention proposes a novel bi-material electrical connection element comprising different materials aimed at ensuring distinct functions and specific geometries.

More specifically, the invention proposes a connecting element as described in the introduction, in which the slot has, between the proximal portion and the distal portion, an intermediate portion delimited by two intermediate edges made of a material different from the second material; the connecting edge of the distal part of the slot extends generally in the extension of one of the two intermediate edges of the intermediate part of the slot, the other connecting edge of the distal part being formed continuously with one of the intermediate edges (forming a continuation of one of the intermediate edges).

The electrical connection element according to the invention thus comprises a proximal portion made of a rigid material for effectively cutting the insulating sheath of the electric wire, and a distal portion made of an electrically conductive material for ensuring a good electrical connection between the conductive core of the electric wire and the connection element. The intermediate portion is made of a material different from that of the distal portion to ensure that the conductive core can be stripped and calibrated after the insulating sheath has been cut.

In fact, one edge of the intermediate portion of the slot is generally located in the extension of the connecting edge of the distal portion, the conductive core of the wire is scraped by the edge of the intermediate portion, and the scraped portion of the conductive core immediately comes into contact with the connecting edge during the insertion of the wire.

Thus, the cutting of the insulating sheath and the alignment of the conductive core are ensured by two distinct portions of the connecting element, and which are distinct from the connecting edge.

With this arrangement, deterioration of the connecting edge, which is generally associated with insertion and removal of the wire into and out of the connecting element, is limited.

The connecting element according to the invention thus makes it possible to establish a high-quality connection in a durable manner between the electric line and the second part of the connecting element, which is made of a material with a relatively high electrical conductivity.

Other non-limiting and advantageous features of the connecting element according to the invention are the following:

the width of the middle part of the slot is strictly smaller than the diameter of the conductive core of the wire;

the width of the middle portion of the slot is constant;

the width of the middle portion of the slot decreases in the direction of the distal portion of the slot;

one edge of the slot is made entirely of the first material, while the other edge is made of the first material at the proximal and intermediate portions and of the second material at the distal portion;

-the proximal and intermediate portions of the slot are provided in the first part, the intermediate portion of the slot extending in the first part through a window which receives a portion of the second part;

the two parts each comprise two planar portions abutting against each other;

-said second part comprises a planar portion abutting the first part and a curved portion, the free end of which is received in said window of the first part;

the two parts are assembled together in a fixed manner;

-one of the two parts comprises an opening and the other part comprises a projection which passes through the opening of the first part;

-the first material comprises stainless steel or steel and the second material comprises copper;

-at least one of the edges of the proximal portion of the slot made of said first material is a cutting edge.

The invention also relates to an electrical connection terminal comprising at least one electrical connection element as described above, wherein the second part of the electrical connection element is electrically connected to a receiving socket of an electrical connection plug of an electrical device.

The invention also relates to an electrical connection terminal comprising at least one electrical connection element as described above, wherein the second part of the electrical connection element is electrically connected to a contact of a circuit breaker (switch).

The invention finally relates to an electrical appliance comprising an electrical connection element as described above, belonging to a connection terminal for connecting the electrical appliance to an electrical network.

Advantageously, the second part of the electrical connection element is electrically connected to a receiving socket of an electrical connection plug of another electrical apparatus or to a contact of a circuit breaker.

Drawings

It will be clear what constitutes the invention, and how it may be implemented, with reference to the description of the figures given by way of non-limiting example.

In the drawings:

figure 1 is a schematic front perspective view of an electrical connection element according to the invention,

figure 2 is a schematic rear perspective view of the electrical connection element of figure 1,

figure 3 is a schematic rear view of the electrical connection element of figure 1,

figure 4 is a schematic view of the electrical connection element of figure 1 from below,

figure 5 is a schematic right-side profile view of the electrical connection element of figure 1,

figure 6 is a schematic front view of the electrical connection element of figure 1,

figure 7 is a schematic left-side outline view of the electrical connection element of figure 1,

figure 8 is a schematic view of the electrical connection element of figure 1 from above,

FIG. 9 is a schematic view of the electrical connection element of FIG. 1, wherein the wire is close to the slotted mouth of the element,

FIG. 10 is a schematic view similar to FIG. 9, with the wire engaged in the proximal portion of the slot,

FIG. 11 is a schematic view similar to FIG. 9, with the wire engaged in the intermediate portion of the slot,

FIG. 12 is a schematic view similar to FIG. 9, with the wire engaged in the distal portion of the slot,

figure 13 is a schematic view in partial perspective of a terminal comprising two connection elements according to the invention,

figure 14 is a cross-sectional view of the terminal of figure 13 along the plane P1,

fig. 15 is a complete perspective view of the terminal of fig. 13.

Detailed Description

In general, the connecting element 1 according to the invention is an "electrical connecting element with insulation penetration" for establishing an electrical connection between an electrical apparatus and an electrical wire 2, the electrical wire 2 comprising a conductive core 4 surrounded by an insulating sheath 3, as shown in fig. 9 to 12.

For this purpose, the connecting element 1 comprises a slot 11 into which the wire 2 is inserted (fig. 9 to 12).

More precisely, the slot 11 extends along a longitudinal axis X, the wire 2 being inserted along an insertion direction parallel to the longitudinal axis X of the slot 11.

The electrical line 2 extends here in a direction substantially perpendicular to the insertion direction.

During the insertion of the electric wire 2 into the slot 11 of the electrical connection element 1, at least one edge of the slot 11 pierces the insulating sheath 3 of the electric wire 2 and comes into contact with the conductive core 4 of the electric wire 2 (figures 11 and 12).

In order to effectively pierce the insulating sheath 3 of the wire 2 to expose the conductive core 4 of the wire 2, the corresponding edges of the slot 11 must have mechanical properties of sufficient rigidity.

In addition, the slot 11 comprises at least one connecting edge made of a material having sufficient electrical conductivity to enable an electrical connection between the conductive core 4 of the wire 2 and the connecting element 1.

In particular, the slot 11 must allow easy insertion of the wire 2 while maintaining sufficient pressure on the conductive core 4 to ensure good electrical contact between the conductive core 4 of the wire and the corresponding connecting edges of the slot 11, to reduce the contact resistance as much as possible and avoid overheating.

In fig. 1 to 12, an electrical connection element 1 according to the invention is shown. In fig. 13 and 14, a terminal 100 is shown, which comprises two electrical connection elements 1.

The connection element 1 belongs for example to an electrical apparatus, such as a socket or any switch.

The connection element 1 can connect an electric line 2 from the electric network to the electrical components of the device to supply it with electricity.

As mentioned above, the electrical connection element 1 comprises a slot 11 for introducing said insulated wire 2. The slot 11 is delimited by two oppositely disposed

edges

11A, 11B of the connecting element (fig. 1, 2 and 6).

In the embodiment shown in the figures, the electrical connection element 1 according to the invention comprises two

distinct parts

5, 6 assembled.

The two parts are made of two different materials and have different electrical conductivities.

The first member 5 is made of a first material having a lower electrical conductivity than the second material, and the second member 6 is made of the second material, and thus has a greater electrical conductivity than the first material.

Advantageously, the first material also has a greater hardness (stiffness, rigidity) than the second material. In practice, the first part 5 is made, for example, of a metal such as stainless steel or steel, and the second part 6 is made, for example, of copper or a metal alloy containing copper.

The hardness of a metal defines its strength against penetration by a harder body. Using a standardized test method, this is determined by measuring the depth, diameter or other parameter of the mark left by the punch during the test.

Each of the first and

second members

5, 6 is plate-shaped. The two plates forming the first 5 and second 6 part abut against each other and are assembled together in a fixed manner.

In the example described here, the first component 5 therefore comprises a central opening in which the projection 6A of the second component 6 projects (fig. 2, 3, 5, 7, 8).

The boss 6A is enlarged (widened) after passing through the first member 5 so as to be caught. This is achieved, for example, by stamping the second part 6 to form a boss and riveting the boss to the first part 5, or by a riveting type operation.

In a general manner, the first and

second parts

5, 6 are joined (integrated) by a connection which inhibits all relative movement of one part with respect to the other. The joining may be by, for example, embedding, clamping, engaging, welding or riveting.

The first part 5 has a substantially square outline (fig. 3).

It comprises a planar major portion 51 and a minor portion 52 (fig. 2). The secondary portion 52 is connected to the primary portion 51 by a curved portion 53. The curved portion 53 extends to one edge of the first part 5 at the same time (fig. 6). The curved portion 53 and the minor portion 52 are folded towards the second part 6 (figures 4 and 8).

An opening 20 is formed in the first part 5 (fig. 2, 3 and 13). As explained in more detail later, the opening 20 partially delimits a slot 11 for the introduction of the wire 2 and a window 21 in which a portion of the second part 6 protrudes (fig. 2, 3 and 13).

The opening 20 extends across the curved portion 53 and the major and

minor portions

51, 52 of the first component 5.

More precisely, the window 21 is constituted by a portion of the opening 20 extending in the main portion 51 of the first part 5.

The second part 6 comprises a planar main portion 61, which main portion 61 has a substantially rectangular outline (fig. 1, 6 and 9 to 12). When the first and

second components

5, 6 are assembled, three major sides of the main portion 61 of the second component 6 are flush with three corresponding sides of the planar main portion 51 of the first component 5.

From the fourth side of the planar main portion 61 of the second element 6 extends a slightly curved tongue 62 (fig. 1, 4, 6, 8 and 9 to 14) which constitutes the curved portion of the second element 6. More precisely, the tongue 62 extends from the side (side, cross-section, tangent) of the main portion 61 of the second component in the extension of the main portion 61 and is bent towards the first component 5.

The first and

second parts

5, 6 are arranged such that the free end of the tongue 62 extends into the open window 21 in the main portion 51 of the first part 5.

A slot 11 (fig. 1 to 3, 6 and 9 to 15) for the introduction of the wire 2 is delimited between the two

parts

5, 6. The slot 11 is closed, extends from the mouth to the bottom 11C, and is along a longitudinal axis X (fig. 6). This longitudinal axis X is parallel to the two parallel edges of the plate forming said first component 5.

The curved portion 53 of the first part 5 further extends along the longitudinal axis X of the slot 11.

Therefore, in practice, the slit 11 is formed in the curved portion 53 of the first member 5 and is opened on the edge of the plate constituting the member 5. Here, the slots 11 have a particularly specific arrangement. More specifically, it comprises:

a proximal portion 12, situated at the mouth of the slot, the width of which decreases towards the bottom of the slot 11, wherein at least one

cutting edge

12A, 12B is made of said first material (figures 2, 3, 6 and 9 to 12),

a distal portion 13 located at the bottom 11C of the slot, wherein at least one edge 13A, called connecting edge, is made of a second material that is more electrically conductive than the first material (fig. 2, 3, 6 and 9 to 12), and

an intermediate portion 14, located between the proximal portion 12 and the distal portion 13, delimited by two calibrated

edges

14A, 14B made of a material different from said second material,

the connecting edge 13A of the distal portion 13 of the slot 11 extends as a whole over the extension of one 14A of the two calibrated edges of the intermediate portion 14 of the slot 11 (fig. 2, 3, 6 and 9 to 12).

The slot 11 for the introduction of the wire 2 therefore comprises three portions: a proximal portion 12, an intermediate portion 14 and a distal portion 13, which, when the wire 2 is inserted into the slot 11 of the connecting element 1, pass through these three portions in turn in an insertion direction parallel to the longitudinal axis X of the slot 11.

Here, the two

edges

12A, 12B of the proximal portion 12 of the slot 11 belong to the first component 5 with greater hardness.

The edge 12A of the proximal portion of the slot 11 belongs to the main portion 51 of the first component 5, while the edge 12B of the proximal portion of the slot 11 belongs to the minor portion 52 of the first component 5.

Therefore, the proximal portion of the slit 11 has rigidity that is easy to tear the insulating sheath 3 of the electric wire 2. In addition, the higher hardness of the first material forming the cutting edges 12A, 12B of the proximal portion 12 of the slot 11 ensures that the proximal portion 12 does not deform during insertion of the wire 2 and does not become blunt during insertion/stripping of the wire.

To facilitate tearing (puncturing, ripping) of the insulation sheath of the wire, at least one of the

edges

12A, 12B of the proximal portion of the slot 11 is preferably a sharp edge. Here, both

edges

12A, 12B of the proximal portion 12 are sharp edges.

To this end, in the connecting element 1 shown in fig. 1 to 12, the

edges

12A, 12B of the proximal portion 12 of the slot 11 have a form suitable for tearing the insulating sheath 3 of the wire 2 when it passes through the slot. Here, in practice, the width of the proximal portion 12 of the slot 11 decreases from the mouth of the slot 11 towards the bottom 11C, defining, at the junction with the intermediate portion 14 of the slot 11, two oppositely disposed sharp edges (edges) P which facilitate tearing of the insulating sheath 3 (see fig. 2).

In addition, the

edges

12A, 12B of the proximal portion 12 of the slot 11 belong to two oppositely inclined portions of the first part 5, these two

edges

12A, 12B also being inclined with respect to each other, said sharp edges P also being inclined with respect to each other. This arrangement facilitates tearing of the insulating sheath 3 of the wire 2 as the wire 2 passes through the portion of the slot 11.

In variations, the edge of the proximal portion of the slot may include one or more cuts that facilitate cutting of the insulating sheath.

In another variation, the thickness of the edge of the proximal portion may itself be small enough to tear the insulating sheath.

The cutting edges 12A, 12B of the proximal portion 12 of the slot 11 are therefore adapted to pierce the insulating sheath 3 of the wire 2 when the wire 2 is introduced into the slot 11.

The insulating sheath 3 of the wire 2 is torn and pushed when inserted into the proximal portion 12 of the slot 11 (see fig. 10).

In the embodiment shown in the figures, the two calibrated

edges

14A, 14B of the intermediate portion 14 of the slot 11 extend parallel to each other from the sharp edge P of the proximal portion 12 of the slot 11.

Here, each of the calibration edges 14A, 14B is formed by a side face of one portion of the first component 5. More precisely, the two

calibration edges

14A, 14B are formed here by the side of the main part 51 and the side of the secondary part 52 of the first component 5, respectively.

The side faces of each portion of the first component 5 are delimited between two

parallel faces

51A, 51B, 52A, 52B of the plate forming that portion (fig. 1 and 2).

They run here parallel to the longitudinal axis X of the slot 11 and on both sides of this axis (see fig. 6).

The two calibrated

edges

14A, 14B are spaced from each other by a distance calibrated to be slightly smaller than the diameter of the conductive core 4 of the wire 2.

This distance also corresponds here to the width of the curved portion 53 of the first part 5.

In other words, the width of the intermediate portion 14 of the slot 11, i.e. its transverse dimension with respect to the longitudinal axis X of the slot 11, is strictly smaller than the diameter of the conductive core 4 of the wire 2.

Thus, when the wire 2 is inserted into the middle portion 14 of the slot 11, the conductive core 4 of the wire 2 is cut by the calibrated

edges

14A, 14B of the middle portion 14 of the slot 11 (see fig. 11).

The conductive core 4 is thus slightly scratched when passing in the middle portion 14 of the slot 11.

The edge 14A of the intermediate portion 14 of the slot 11 belongs to the main portion 51 of the first part 5, the edge 14B of the intermediate portion 14 of the slot 11 belongs to the secondary portion 52 of the first part 5, the two

edges

14A, 14B of the intermediate portion 14 of the slot 11 being inclined with respect to each other. Therefore, the conductive core 4 of the electric wire 2 is easily peeled.

After passing through the intermediate portion 14, the wire 2 is inserted into the distal portion 13 of the slot 11.

The distal portion 13 of the slot 11 is delimited by two

edges

13A, 13B, at least one of which, called the connecting edge 13A, is made of a second material having a greater electrical conductivity.

According to the invention, the connecting edge 13A extends in the extension of a calibrated edge 14A of the intermediate portion 14 of the slot 11.

More specifically, the connecting edge 13A is formed by an edge of a side face of one portion of the second member. Here, the connecting edge 13A corresponds to the edge of the free end of the tongue 62 of the second part 6. Here an edge of the side of the tongue 62 (fig. 14).

In a variant, the connecting edge may be constituted by a side face of a portion of the second component, for example a tongue of the second component.

This connecting edge 13A extends as a whole in the extension of the edge 14A of the intermediate portion 14, since it extends only in the space between the planes containing the two

parallel faces

51A, 51B that delimit the sides that constitute the edge 14A of the intermediate portion 14, this space including the plane itself (fig. 14).

The sides of a portion of the first part 5 constituting the edge 14A of the intermediate portion 14 and the sides of a portion of the second part 6 constituting the connecting edge 13A, in which the ribs are present, may be slightly offset (offset) from each other when said ribs are located exactly in the space defined above.

When the connecting edge is constituted by a side face of a portion of the second part, the side face forming the connecting edge extends completely in the space defined above.

Thus, during the insertion of the wire 2, the connecting edge 13A is next to (continuous with) the edge 14A of the intermediate portion 14.

Here, the tongue 62 is bent in the window 21 of the first part 5, the edge forming the free end of the tongue 62 of the connecting edge 13A extending in the extension of the side of the main portion 51 of the first part 5 constituting the edge 14A of the intermediate portion 14. The ridge extends in the plane of the edge 14A of the central part 14, i.e. in the plane of the side of the first part 5 at the opening 20 of the central part 14 forming the slot 11.

In practice, the edge forming said connecting edge 13A extends in the plane of the edge 14A of the intermediate portion 14, ignoring manufacturing tolerances.

In a variant, the connecting edges may be slightly staggered with respect to the plane of the side of the first component 5 forming the edge 14A of the intermediate portion 14, while remaining in the space defined above.

Therefore, when the electric wire 2 is pushed toward the bottom 11C of the slit 11, the region of the conductive core 4 cut by the edge 14A of the middle portion 14 of the slit 11 comes into contact with the connecting edge 13A of the distal portion 13 of the slit 11.

This arrangement makes it possible to ensure optimal electrical contact between the conductive core 4 of the wire 2 and the connecting edge 13A of the distal portion 13 of the slot 11. The other edge 13B of the distal portion 13 of the slot 11 is here formed continuously with the edge 12B of the proximal portion 12 and the edge 14B of the intermediate portion 14 of the slot 11.

Together they form one edge 11B of the slot 11 made entirely of the first material. This edge 11B is straight and is constituted by the side of the second portion 52 of the first component 5.

The other edge 11A of the slot 11 is made of a first material in the proximal portion 12 and the intermediate portion 14 and of a second material in the distal portion 13. It is delimited in succession by an edge 12A of the proximal portion 12, an edge 14A of the intermediate portion 14 and a connecting edge 13A of the distal portion. This is in fact the side of the main portion 51 of the first part 5 in the proximal and intermediate portions and the edge of the tongue 62 of the second part 6. The edges 11A of the slot 11 are straight as a whole and parallel to the edges 11B of the slot 11.

In a variant, the edges of the intermediate portion may be slightly inclined so that the width of the intermediate portion of the slot decreases towards the distal portion of the slot.

The slope of the edges of the intermediate portion with respect to the longitudinal axis of the slot is, for example, less than or equal to 5%.

Fig. 13 shows a partial view of a connecting terminal 100 comprising two connecting elements 1.

The second part 6 of each of the two connecting elements 1 of the terminal is integrated into a receiving socket 110 of an electrical connecting plug (not shown in the figures) of an electrical device.

Here, it is a connecting plug of circular cross section.

The receiving socket 110 is folded from two

wings

111, 112 of a metal strip on either side of a flat bottom 113 of the socket 110 to form a cylindrical sleeve adapted to receive a connecting plug.

The flat bottom 113 of the receiving socket 110 extends laterally at two opposite ends by portions bent at right angles to form the second part 6 of each connecting element 1.

Since the connection element 1 is formed together with the receiving socket 110, the connection element 1 is electrically connected with the receiving socket 110.

Fig. 1 to 12 show the connecting element 1 of the connecting terminal 100 in isolation. The connecting elements 1 shown in fig. 1 to 12 comprise a turned-back portion 114 along one side of the main portion 61 of the second part 6, which turned-back portion 114 corresponds to the bottom bend 113 of the receiving socket 110, which connects the main portion 61 of the second part 6 of each connecting element 1 with the receiving socket 110.

In practice, the diverting portion 114 is formed together with the main portion 61 of the second part 6 of the connecting element 1 and the receiving socket 110.

In a variant, the geometry of the terminal may differ from that of the example shown in fig. 13, and the turn-around portion may be arranged differently on the main portion of the second part of the connecting element.

In another variant, the connecting element can be connected to the receiving socket in a different manner. It may not include the turning portion.

According to another variant, the connection element can be connected to the contacts of the circuit breaker.

According to another variant, it is possible to envisage the connecting element comprising more than two distinct parts, for example three distinct parts.

The three distinct components may be made of three different materials. One of the parts comprises, for example, the edge of the proximal portion of the slot, the second part comprises the edge of the middle portion of the slot, and the third part forms the connecting edge of the slot.

Finally, fig. 15 shows a complete connection terminal 100, which comprises a receiving socket 110, two connection elements 1 as described above, and a spring plate 120 which surrounds the

wings

111, 112 of the receiving socket in order to permanently push the wings of the receiving socket towards one another in order to clamp the connection plug when it is introduced into the receiving socket defined thereby.

Claims

1. Electrical connection element (1) with an insulating sheath penetration, formed by at least two distinct parts (5, 6) made of different conductive materials, the two parts (5, 6) defining between them a slot (11) for the insertion of a sheathed wire (2), the slot having:

-a proximal portion (12) located at the mouth side of the slot, the width of which decreases towards the bottom (11C) of the slot (11), at least one of the edges (12A, 12B) of which is made of a first material,

-a distal portion (13) located on the side of the bottom (11C) of the slot, at least one of the edges (13A, 13B) of which, called the connecting edge (13A), is made of a second material having a better electrical conductivity than the first material,

characterized in that the slot (11) has an intermediate portion (14) between the proximal portion (12) and the distal portion (13), which is delimited by two intermediate edges (14A, 14B) made of a material different from said second material; the connecting edge (13A) of the distal portion (13) of the slot (11) extends generally in the extension of one (14A) of the two intermediate edges of the intermediate portion (14) of the slot (11); and the other edge (13B) of the distal portion (13) is formed continuously with an intermediate edge (14B).

2. The electrical connection element (1) according to claim 1, wherein the width of the intermediate portion (14) of the slot (11) is strictly smaller than the diameter of the conductive core (4) of the wire (2).

3. The electrical connection element (1) according to any one of claims 1 and 2, wherein the width of the intermediate portion (14) of the slot (11) is constant.

4. The electrical connection element according to any one of claims 1 and 2, wherein the width of the middle portion of the slot decreases in a direction towards the distal portion of the slot.

5. The electrical connection element (1) according to any one of claims 1 and 2, wherein one edge (11B) of the slot (11) is entirely made of a first material, while the other edge (11A) is made of a first material for the proximal portion (12) and the intermediate portion (14) and of a second material for the distal portion (13).

6. The electrical connection element (1) according to any one of claims 1 and 2, wherein a proximal portion (12) and an intermediate portion (14) of the slot (11) are provided in a first part (5) of said two parts, the intermediate portion (14) of the slot (11) extending in the first part (5) through a window (21) accommodating a portion of a second part (6) of said two parts.

7. The electrical connection element (1) according to any one of claims 1 and 2, wherein the two parts (5, 6) each comprise two planar portions (51, 61) abutting each other.

8. Electrical connection element (1) according to claim 6, wherein the second part (6) comprises a planar portion (61) which abuts the first part (5) and a curved portion (62) whose free end is received in the window (21) of the first part (5).

9. Electrical connection element (1) according to any of claims 1 and 2, wherein the two parts (5, 6) are assembled together in a fixed manner.

10. The electrical connection element (1) according to claim 9, wherein a first part (5) of the two parts comprises an opening and a second part (6) of the two parts comprises a protrusion (6A) which passes through the opening of the first part (5).

11. Electrical connection element (1) according to any of claims 1 and 2, wherein the first material comprises steel and the second material comprises copper.

12. The electrical connection element (1) according to any one of claims 1 and 2, wherein the first material comprises stainless steel and the second material comprises copper.

13. Electrical connection terminal (100) comprising at least one electrical connection element (1) according to any one of the preceding claims, wherein the second part (6) of the two parts of the electrical connection element (1) is electrically connected to a receiving socket (110) of an electrical connection plug of an electrical apparatus.

14. Electrical connection terminal comprising at least one electrical connection element according to any one of claims 1 to 12, wherein the second of the two parts of the electrical connection element is electrically connected to a contact of a circuit breaker.

15. Electrical apparatus comprising an electrical connection element (1) according to any one of claims 1 to 12, belonging to a connection terminal (100) for connecting it to an electrical network.

16. The electrical apparatus of claim 15, wherein the second part (6) of the two parts of the electrical connection element (1) is electrically connected to a receiving socket (110) of an electrical connection terminal (100) of another electrical apparatus or to a contact of a circuit breaker.