FR2926393A1 - Voltage trigger's electronic module case for e.g. three-pole circuit breaker, has box to house actuator in rest position at inside of case and in active position, in which actuator protrudes out from case by orifice and recess of lid - Google Patents

Abstract

The case has a bottom part (22) and a lid forming a cavity. The cavity has a box (58) including an activation orifice arranged at level of a side wall of the bottom part permitting to place an electromagnetic actuator. The box is adapted to house, in a sealed manner with respect to the cavity, the electromagnetic actuator in a rest position at inside of the case and in an active position, in which the actuator protrudes out from the case by the activation orifice and a recess of the lid. Independent claims are also included for the following: (1) an electronic module comprising an actuator associated with a connector passing through a passage of the box (2) a triggering device comprising an electronic module with a case integrated to a case of a transformation block (3) a method for assembling a triggering device.

Description

TRANSFORMATION BLOCK OF A DOUBLE-PASSING ELECTRONIC TRIGGER

TECHNICAL AREA

The invention relates to the triggering of switchgear by means of an electronic processing. The invention more particularly relates to a current transformer block for supplying an electronic trip unit that can integrate into existing switchgear and whose thermal losses are minimized.

In one aspect, the invention relates to a current transformer element in which the primary conductor wraps around the magnetic circuit and, although rigid, includes only a solder point. A block composed of several elements as well as a trigger comprising a transformation element are also objects of the invention.

The invention also relates to the method of assembling the transformation element 20 comprising the establishment of two parts of the primary conductor, the deformation of at least one of them, and their welding.

STATE OF THE ART

A circuit breaker 1 acts on the main conductors of a power supply line, three in the frame illustrated in FIG. 1: the main conductors are connected via terminal pads 2 to contacts of a switchgear device 3, said contacts permitting to establish or interrupt the primary current flowing through it. The molded case circuit breaker 1, whose size is more or less standardized and defined by the range of the cut-off device 3, comprises a trigger 4, also connected via terminal strips 5 to the supply line, which allows to conveniently control the actuation of the contacts of the cut-off device 3. The trigger 4 is put in place in a housing 6 arranged in the casing of the circuit breaker 1 and / or the cut-off device 3; usually removable, it is mounted only during installation. It is also customary for the triggers 2 to be interchangeable to satisfy the variety of demand, ranging from the basic protection to the most advanced protection, having multiple adjustment points and / or different measuring functions such as voltage, power and / or energy.

A conventional type of tripping device 4 is the electronic release, which comprises an electronic module 7 associated with a current transforming unit 8. The electronic module 7 comprises an integrated circuit card type processing unit, protected in a housing made of insulating material, which receives signals indicative of the distribution circuit from the block 8 via suitable connectors 9; when the value of the current signals exceeds predetermined thresholds for predefined durations, the processing unit sends a signal to the cutoff apparatus 3 to separate its pairs of contacts.

The transforming block 8 has two main functions: to provide the electronic module 7 with an input signal representative of the current flowing in the supply line to be protected, and to provide the power necessary for the operation of the trip device 4. In fact, the primary current associated with the power supply line is of incompatible value with the electronic processing module 7. The transformer unit 8 thus comprises, for each pole, a transformer element 10 shown diagrammatically in FIG. 2 which consists mainly of a magnetic circuit 12 crossed by a primary conductor 14 from the power supply 5 which connects to the breaking device 3 by its other end 5 '; a secondary circuit 16, comprising a winding of turns, is dedicated to the transformation of the current and delivers the necessary signal to the electronic module 7.

The transformation block 8 is operable with a variable primary current, between an operating value and power supply fault values. In both cases, the magnetization of the circuit 12 must be suitable for the transmission of the signal, sufficient at low current but without high current saturation. Document US Pat. No. 5,015,983 proposes to wind the primary conductor 14 on the magnetic circuit 12 so as to maintain a constant input power on the electronic module 7 without sacrificing the sensitivity of the current transformer 10. connection 5, 5 'of an electronic release 4 are made of rigid conductive material to facilitate connections and assemblies, the primary winding is conventionally composed of at least three parts, with a central portion welded at both ends to the ranges of supply of current. For small sizes, the central part can be flexible; when the intensity of operation increases, the section of the turns is increased, and it becomes difficult to wind the driver: the driver is then in a rolled form, having undergone preforming with a tool.

If these solutions are satisfactory from an operating point of view, they nevertheless require at least two soldering points for each primary circuit 14. In addition to the production costs related to the duration and number of operations required, associated with the risks of failure these weld points decrease the resistance of the assembly and therefore increase the thermal losses.

SUMMARY OF THE INVENTION

Among other advantages, the invention aims to overcome the disadvantages of existing transformation elements, and to reduce the steps of setting up the primary conductor, while respecting the constraints of space.

In one aspect, the invention relates to a current transforming element in which the rigid primary conductor, in particular consisting of a folded metal plate, forms a substantially rectangular loop around the magnetic circuit. In order to reduce the heating, the primary conductor is composed of only two parts, welded or otherwise secured by one end at the loop. To allow the passage of each conductor portion in the center of the magnetic circuit, at least one of the parts is not fully folded at its end; in particular, the last angle between two sides of the loop is obtuse, and it is closed at 90 ° once placed around the housing of the transformation element. 4 A current transformer element according to the invention comprises in particular a magnetic circuit partially surrounded by a secondary winding which are protected in a housing provided with a passage, preferably substantially rectangular, passing through the magnetic circuit. A rigid primary conductor, preferably cut from a metal plate and folded, comprising at its ends two terminal inlet and outlet areas, passes twice through the passage of the housing, thus forming a substantially rectangular loop. The conductor can be decomposed into nine successive portions, with two terminal areas associated with two intermediate portions framing a loop formed of two parallel portions, and preferably coplanar, in the passage, two lateral portions substantially orthogonal to the passage portions and connecting them to a opposite portion, parallel to the passage portions. Preferably, the end plates are mutually parallel, advantageously offset relative to one another, and in particular define four parallel planes with the passage portions and the opposite portion. In order to allow the conductor to be placed around the housing and to optimize the resistance caused by welding or other crimping, the conductor is formed of two parts, between a terminal strip and a junction end located on a portion of the loop . Preferably, the ends of each conductor portion comprise cooperating joining means, for example a protuberance inserted into a hole. The two conductor parts may be symmetrical or not.

Although the passage does not allow the establishment of one of the preformed parts at least of the conductor, and whatever the cutting of the loop of a conductor for an element according to the invention, the final configuration is obtained by deformation of one of the parts at least once in place. The deformation is preferably performed at one of the bends separating two portions of the conductor portions; in particular, advantageously, each conductor portion is substantially folded into its final form, and only a few angles, or even one, are more open than in the final version.

The invention thus also relates to a method in which each conductor portion is put in place, and at least one or both parts are deformed by closing one or more angles between two end portions. of one or both parts, so that their joining ends cooperate. Welding, or other securing, is then performed. Advantageously, if only one of the conductor parts is insufficiently closed, it is placed in the passage of the housing and deformed before the insertion of the second conductor portion.

The transformation element according to the invention is used for an electronic release of a switchgear. Preferably, several elements are associated to form a block whose number of poles corresponds to the number of poles of the breaking device; the ranges of the elements are then advantageously aligned to facilitate the introduction. The assembly of conductors in such a block can be done successively, but it is preferable according to the invention to directly reiterate each step of the process for each of the conductor parts before continuing the process; in particular, it is advantageous to deform each part at the same time.

A block, or element, is associated with an electronic module to form an electronic trigger. Preferably, the assembly is done by clipping the module on the housing of the block or the transformation element, provided with adequate means; a connector transfers information from the secondary windings to the electronic module. The triggering device can be associated with a switchgear device so as to form a circuit breaker also object of the invention.

BRIEF DESCRIPTION OF THE FIGURES Other advantages and features will become more clearly apparent from the following description of particular embodiments of the invention, given by way of illustration and in no way limiting, represented in the appended figures.

FIG. 1, already described, illustrates a circuit breaker in which an electronic release comprising a transformation unit according to one embodiment of the invention can be implemented. Figure 2, already described, schematically shows the operation of a transformation element of an electronic trigger. Figure 3 shows an electronic trigger realized according to a preferred embodiment of the invention.

Figure 4 shows the general shape of a primary conductor for a transformation element according to the invention.

FIGS. 5A and 5B illustrate the steps of assembling the primary conductor of a transformation element according to one embodiment of the invention. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

The invention will be described hereinafter according to a preferred embodiment for a tripolar circuit breaker 1 as illustrated in FIG. 1, that is to say comprising three pairs of contacts for interrupting the current in each of the three phases. However, the element 10 and / or the processing block 8 according to the invention can be adapted to the different existing molded case cut-off devices, operating in particular between 25 and 100, even 250 A, regardless of the number of poles. concerned.

In order to simplify the presentation of a preferred embodiment of the invention, the transformation unit 8 will be described in relation to the assembly / mounting position in which the circuit breaker 1 is laid flat, the recess 6 of the housing being oriented upwards. The use of relative positional terms, such as lateral, upper, horizontal, etc., should not be construed as a limiting factor.

As illustrated in Figure 1, a trigger 4 defines an outer envelope which fits into a recess 6 of the casing of the circuit breaker 1; said envelope is delimited, as also illustrated in FIG. 3, by the assembly of an electronic processing module 7 with a current transformation block 8. The transformation block is composed of an adequate number of elements transformers 101, 102, 103, each being dedicated to a conductor of the supply line, which are secured to form a unitary block 8, or which can remain independent of each other. Each transformation element 10 makes it possible to transform the high value primary current associated with the supply line into a secondary current compatible with the electronic processing module 7. A transformer element according to the invention preferably also comprises a recovery circuit. which supplies a power supply to the electronic trigger 4.

Each transformation element 10 is thus associated with a primary conductor 14 intended to connect to the supply line at one end and to connect to a switchgear device 3 at the other end. For this purpose, the primary conductor 14 is provided with an input end (downstream) pad 5 and an exit end pad 5 'which are preferably parallel to each other. For a simplification of the connection, each area 5, 5 'is formed by a rigid conductive metal plate, for example made of aluminum or copper, whose section and dimension are adapted to the transmitted current, and provided with an orifice 18, 18 . In particular, the downstream range 5 is standardized in size with respect to the supply value, and the shape of the output range 51 ', 52', 53 'depends on the switchgear 3; in particular, the downstream zone 5 is 13 mm square square, the 2 mm thick copper being pierced with an orifice 18 of diameter of the order of 9.5 to 10 mm, whereas the output range 5 'can be rectangular 7 to 10 mm side with an oblong hole 18 '(eg 4.5 to 4.7 mm over 6 to 6.5 mm) tolerant of positioning deviations.

The magnetic circuit 12 of a transforming element 10 according to the invention is preferably rectangular in shape so as to facilitate assemblies with the cut-off device 3 and the electronic module 7. The magnetic circuit 12 is surrounded at one side , preferably on a small lower side of the rectangle, by a winding 16 so that the secondary conductor which forms it crosses several times the magnetic circuit 12; the secondary winding 16 comprises at its ends a connector 9 which can be connected to the electronic module to communicate information about the secondary signal, that is to say the primary current; preferably, the connector 9 is adapted to a wafer connection of an electronic card, as for example described in the document FR 06 08921. The magnetic circuit 12 and the secondary winding 16 are put in place in an insulating casing 20 of adapted form substantially rectangular parallelepiped, provided with a passage 22 through which the primary conductor 14 passes. Depending on the desired options, it is possible to associate with the housing 20 of the transformation element 10 the auxiliaries of the measurement or voltage enhancement type. .

The transformation element 10 according to the invention is particularly suitable for small circuit breakers, in particular between 25 and 100 A. In order to obtain a signal representative of the current after transformation, the primary conductor 14 must pass more than once. the magnetic circuit 12 because the current flowing in operating mode does not have a sufficient level for the measurement and supply thresholds of the trigger 4. It is therefore necessary to wind the conductor 14 around the magnetic circuit 12 of the trigger 4, or possibly associated sensors, to properly process the signal for measurement and power. The loop 24 thus formed is of substantially rectangular shape, with one side passing through the passage 22 formed by two portions 26 of the conductor 14. In addition to the constraints on its section as a function of the intensity of the current flowing therethrough, the conductor 14 is rigid also over its entire length to maintain the position of the loop 24 around the magnetic circuit 12; in particular, the spacing between the turns 26 of the conductor 14 at the passage 22 is retained so as not to have to directly coat an insulator.

Preferably, as illustrated in FIG. 4, the two portions 261, 262 of conductor passing through the passage 22 are on the same plane and separated from the space sufficient to ensure isolation or to position an additional insulating screen. According to a preferred embodiment of the invention, the primary conductor 14 makes more than one revolution of the magnetic circuit 12, and in particular one turn and one eighth. Indeed, the downstream 5 and upstream 5 'connection pads of the conductor 14 are offset relative to each other in the case of the circuit breaker 1, and the transformation elements 10 bend to this constraint. The planes defined by the end plates 5, 5 'of the conductor and its portions 26 passing through the passage 22 are preferably parallel in order to avoid any twisting of the metal plate forming the conductor 14.

The conductor 14 thus comprises successively: 1) a first planar end strip 51; 2) a first intermediate portion 281 at an angle to the first end pad 51; 3) a first passage portion 261 substantially parallel to the first end plate 51; 4) a first lateral portion 301 substantially orthogonal to the first passage portion 261; 5) an opposite portion 32 substantially parallel to the passage portion 261; 6) a second lateral portion 302 substantially parallel to the first 301; 7) a second passage portion 262 coplanar with the first; 8) a second intermediate portion 282 forming an angle with the second passage portion 262; 9) a second end slot 52. In order to ensure the coplanarity of the double passage 26 in the magnetic circuit 22 (that is to say between the portions 261, 262), a suitable cut of the intermediate portions 281, 282 and one of the lateral portions 301 at least is made.

For the three-dimensional configuration above is positioned around the housing 20 and through the passage 22, it is imperative to manufacture the conductor 14 in at least two parts, it is recommended to weld. According to the invention, in order to reduce the heating due to the high resistance of a weld, the conductor 14 of the element 10 according to the invention is manufactured in two parts 341, 342 each comprising one of the end plates 51 , 52; the reduction in the number of weld points 36 is also advantageous in terms of time and manufacturing cost, while increasing reliability.

The space constraints of the electronic releases 4 and their transformation blocks 8 are, however, such that it is not possible to separate the conductor in two at its loop 24 and to introduce it in its form extracted from the rectangle of the loop 24 in the passage 22 of the housing 20 of the magnetic circuit 12. For example, for a circuit breaker 1 of 25 to 100 A, the housing 20 comprises a passage 22 of rectangular shape of width 122 = 14 mm parallel to the connection pads 5, 5 'and height h22 = 6 mm, to a depth of P22 = 15.5 mm. The section of the conductor 14 is calibrated as a function of the circulating current (of the order of 10 A / mm 2) so that the two conductor portions 26 passing through the passage 22 have a minimum width 126 = 5 mm over a thickness h 26 = 2 mm, and should be separated by approximately 0.5 or 1 mm depending on the insulation separating them. The portion of the housing 38 around which the conductor 14 is wound is at least h38 = 8 mm thick (for a depth of p38 = 15.5 mm): whatever the cutout of the loop 24 adopted, one of the parts 34 of the conductor 14 at least can not pass through the passage 22 once formatted.

According to the invention, although rigid, at least one of the conductor portions 341 is not shaped according to its definitive shape before it is inserted into the passage 22; however, to allow a deformation of a rigid conductor around a molded plastic housing 20, each of the parts 34 is made of metal folded substantially in the final form. In particular, as illustrated in FIG. 5A, only the terminal portion at the junction point 36 of the first portion 341, here corresponding to the opposite portion 32, deviates from its final position with an upper opening angle. the 90 ° recommended for the loop 24, so that it is possible to insert said portion 341 in the passage 22. Clamping clamping means then exert pressure on the insufficiently bent portion to close the loop 24, in modifying the angle concerned to achieve the final conformation shown in Figure 5B. The deformation is thus compatible with the rigidity of the conductor 14 and the fragility of the housing 20 since it occurs on a previously folded place.

Advantageously, the first portion 341 of the conductor comprises: the terminal output area 5 'of a size such that it can pass through the passage 22; an intermediate portion 281 making an angle of 90 to 120 ° with the end plate 51; a passage portion 261; a substantially orthogonal lateral portion 301 and arranged to form the horizontal offset of the passage portions 26 of the loop 24; the opposite portion 32 of the loop 24 which, although it will be parallel to the end run 51, and even if it may be in the extension of the lateral portion 301, makes an angle greater than 90 ° with the lateral portion 301, for example of the order of 100 to 135 °, in particular 115 °. The end portion of the first portion 341, here opposite portion 32, is provided at its end with junction means, in particular a protrusion 361. The second portion 342 of the conductor comprises: the end terminal strip 5; an intermediate portion 282 which is substantially orthogonal to it and has a width gradient on one side to achieve a passage portion 262 substantially parallel to the end plate 52 but of restricted size; a lateral portion 302 substantially orthogonal and provided at its end with a junction arrangement 362 cooperating with that of the first part, for example here an orifice.

For assembly, a first insertion step of the first conductor portion 341 is carried out via the introduction of the terminal strip 5 'into the passage 22. In the second place, once the first passage portion 261 is in place in the passage 22, the first part 341 is shaped by folding of the end portion 32. The assembly is continued by the insertion of the second conductor portion 342 via its end portion 302, 362. two parts 341, 342 are then joined by cooperation between their junction arrangement 361, 362, for example an orifice cooperating with a protrusion as illustrated in FIG. 4 or two complementary lugs as illustrated in FIG. 5, or any other solution ; a weld is finally achieved; an insulator can be placed between the two parts 341, 342 at the orifice 22. It is also possible to deform the first portion 341 after placing the two conductor portions 34 in the passage 22; moreover, although the weld is a preferred method of joining, other methods can be envisaged, and for example a crimping of the two ends 361, 362 with each other.

In some configurations, in particular for positioning the junction point 36 at the most suitable place for the fitter and / or if the terminal output area 5 'can not pass through the passage 22 of the housing 20, it is possible for each of the two parts 34 is not made in its final configuration and two deformations by closing the terminal angle between two portions are made around the housing 20 of the magnetic circuit 12; for example, the two conductor portions 34 may be symmetrical. The opening of two angles between three portions of one of the parts 34, and therefore a double deformation of a part, can also be considered. In fact, the two portions 34 forming the primary conductor 14 have defined geometries and cutouts to facilitate assembly and assembly.

Such an assembly can be made for each transformation element 10, which can then be joined to form a block comprising the appropriate number of conductors 14. According to another option, a unitary block 8 comprises the magnetic circuits 12 and secondary windings 16, as well as the additional elements of possible type sensors in a housing; each conductor 14 is assembled on a law element forming part of its passage 22. It is then preferred to perform each assembly step successively for all the conductors 14 before continuing assembly; in particular, the deformations by angle closure are grouped to be performed simultaneously, simultaneously or consecutively.

Regardless of its number of poles, the transformation unit 8 according to the invention is preferably associated with an integrated electronic module 7 as described in the patent application entitled Circuit breaker electronic trip unit, electronic trip device and method of assembly deposited today. Although other means such as screwing can be envisaged, advantageously, the electronic module 7 of a trigger 4 using the transformation block 8 according to the invention comprises a housing which is secured to the transformation block 8 by elastic interlocking, or clipping: this solution allows fast and direct assembly, while allowing disassembly with the appropriate tools. An optimization of the shapes of the clashes, with clips working along perpendicular axes, also makes it possible to guarantee the resistance to the stresses of the assembly.

The trigger 4 can be set up in a circuit-breaker box 1, and coupled to the switchgear 3. During assembly, the orifices of the connection pads 5 'of the trigger 4 and the cut-off device 3 are placed opposite from each other, and secured by means of a rod-type auxiliary. In order to simplify and accelerate the assembly of these two components, advantageously, the trigger 4 according to the invention is provided with breakable screws 40, for example of the type described in documents FR 2 881 485 or FR 2 840 373, of which upper end may be coupled to a longitudinal member so that their alignment is directly positioned in the connecting ports 5 '(see Figure 1); each screw 40 is tightened, a section of the screw occurring when the tightening torque is sufficient: the lower part of the screws 40 provides the connection and the end remains coupled to the longitudinal element, secured to the housing or removable: this option allows to avoid the loss of small parts in distribution cabinets.

Thanks to the assembly solution according to the invention, it is therefore possible to: - reduce the number of possible problems of quality and / or development, by reducing the fastenings 36; - Reduce the cost of all, by reducing the number of parts 34 and manipulations, which reduces the number and complexity of assembly phases; reduce the heating points 36 of the apparatus; - Facilitate the assembly of the electronic release 4 by using a resilient interlocking and a keying eliminating any errors in the mounting direction of the block 8 and the module 7.

Although the invention has been described with reference to an electronic triggering system of an electric switchgear, it is not limited thereto: other elements may be concerned by the invention. In particular, the two-part design of the conductor can be used in a current sensor or other transformer.

Claims (17)

A current transformer element (10) for a trigger (4) of a switchgear (3) comprising: - a housing (20) in which is positioned a magnetic circuit (12) partially surrounded by a secondary winding ( 16), said housing (20) being provided with a passage (22) passing through the magnetic circuit (12); and a primary conductor (14) having at its ends two inlet and outlet end lands (5, 5 '), said conductor (14) forming a substantially rectangular loop (24) for traversing said passage (22) twice level of two passage portions (26) of the conductor each connected to a terminal strip (5) by an intermediate portion (28), so that said conductor (14) successively comprises a first end plate (51), a first intermediate portion (281), a first passage portion (261), a first lateral portion (301), an opposite portion (32), a second lateral portion (302), a second passage portion (262), a second intermediate portion ( 282) and the second terminal pad (52), said passage and opposite portions (26, 32) being substantially parallel and said lateral portions (30) being substantially orthogonal to them; characterized in that said conductor (14) is rigid folded metal and comprises two parts (341, 342) joined together, each portion of the conductor (34) comprising a terminal strip (5) and a junction end (36). 2. Element according to claim 1 wherein the two parts (341, 342) of the conductor (14) are joined together by welding 3. Element according to one of claims 1 or 2 wherein the two passage portions (26) of the conductor (14) are coplanar. 4. Element according to one of claims 1 to 3 wherein the end plates (5, 5 ') are parallel to the passage portions (26) and the opposite portion (32). 14 5. Element according to claim 4 wherein the end plates (5, 5 ') are each in a plane different from the passage portions (26) and offset between them. 6. Element according to one of claims 1 to 5 wherein the two parts (341, 342) of the conductor are symmetrical with respect to each other. 7. current transformer block (8) comprising a plurality of elements (10) according to one of claims 1 to 6 wherein the input terminal strips (5), respectively output (5 '), of each element (101, 102, 103) are aligned. 8. Block according to claim 7 wherein the housings (20) of each element (10) are secured to one another and comprise clipping means. 9. Device for tripping (4) a switchgear device comprising an element (10) according to one of claims 1 to 6 or a block (8) according to one of claims 7 or 8 and an electronic module ( 7) which is connected to each of the secondary windings (16) of said elements or block by a connector (9). 10. A circuit breaker comprising a tripping device (4) according to claim 9 and a switchgear (3) provided with movable contacts relatively to each other, said contacts being operable via the tripping device. (4). 11. A method of assembling a current transformer element (10) comprising a magnetic circuit (12) partially surrounded by a secondary winding (16) housed in a housing (20) provided with a passage (22) passing through the magnetic circuit (12), said method comprising: inserting into the passage (22) a first rigid primary conductor portion (341) comprising a terminal pad (51) and a first joining end (361); Inserting into the passage (22) a second rigid primary conductor portion (342) including a terminal pad (52) and a second splice end (362); deformation of a primary conductor portion (341) at its junction end (361); - The joining of the two joining ends (361, 362), the two conductor portions (34) thus forming a substantially rectangular loop (24). 12. The assembly method according to claim 11 wherein the joining of the two joining ends (361, 362) is achieved by welding. 13. Method according to one of claims 11 or 12 wherein the deformation of a primary conductor portion is formed on the first conductor portion (341) prior to insertion of the second conductor portion (342). 14. Method according to one of claims 11 to 13 comprising the deformation of each primary conductor portion at its junction end prior to its joining. 20 15. Method according to one of claims 11 to 14 wherein the primary conductor portion deformations (34) are made by accentuating a preformed fold of said portion. 16. A method of assembling a processing block (8) comprising a plurality of magnetic circuits (12) partially surrounded by a secondary winding (16) housed in a housing (20) provided with passages (22) passing through the magnetic circuits (12), said method comprising repeating each step of the method of assembling an element (10) according to one of claims 11 to 15 for each primary conductor (14) of the block so as to mount the conductors simultaneously. 30 17. A method of assembling an electronic release comprising the assembly according to one of claims 11 to 16 followed by the clipping of the housing of an electronic module (7) on the block (8) or the element (10). of transformation.