Power cut-off module with dielectric barrier

Abstract

The present invention relates to a power cut-off module (10), comprising an insulating housing (2), two pairs of fixed contacts (3) and two movable contacts (4), the movable contacts being rigidly attached to a movable device (5) which is translatable in the housing (2) between an open position and a closed position. The module is characterized in that it comprises an insulating shielding device (50) having a fixed end rigidly attached to the housing (2) and a movable end rigidly attached to the movable device (5), and the length thereof is variable between an extended position when the movable device (5) is in the open position and a retracted position when the movable device (5) is in the closed position, so as to create a dielectric barrier between the fixed contacts of the same pair of fixed contacts (3).

Description

Technical Field

[0001] The present invention relates to an electrical cut-off module, comprising: an electrically insulating housing; at least one pair of fixed contacts, including an upstream fixed contact and a downstream fixed contact; and at least one movable contact fixed to a device, which is translatable in the housing between an open position and a closed position relative to the at least one pair of fixed contacts. Background Art

[0002] The present invention is applied to a current cut-off device, in which the disconnection of the electrical contacts is achieved by a linear translational movement of a movable contact relative to a fixed contact. In such a cut-off module, the electrical characteristics of the cut-off device are partly determined by the air volume in the cut-off chamber and the control of the dielectric separation between the fixed current input contact and the fixed current output contact. These electrical characteristics correspond to the ability of the cut-off device to manage and quickly extinguish the arc that is usually generated when the circuit is disconnected. The cut-off chamber is defined by the inner wall of the housing and includes the fixed contacts and the movable contact, between which an arc may be generated.

[0003] A linear cut-off module generally includes a movable rod that carries the movable contact and whose length is less than the useful length of the cut-off housing so that it can travel in its path between the open position and the closed position and between the closed position and the open position without colliding with the housing.

[0004] Figure 1 An example of a prior art cut-off module 1 is illustrated, which includes: an electrically insulating housing 2, only the lower half housing 20 of which is shown; two pairs of fixed contacts 3; and two movable contacts 4 carried on a movable device, which is generally referred to as a rod 5 and which is translatable in the direction of arrow T. Figure 1 The cut-off module 1 in the open position is illustrated, in which the movable contact 4 is away from the fixed contact 3 and the circuit is open. The end 5a of the movable rod 5 on the Figure 1 right side is close to or abuts against the corresponding transverse wall 22 of the housing, thus occupying the air volume of the cut-off chamber CC and naturally forming a dielectric separation or dielectric barrier between the upstream fixed contact 3a and the downstream fixed contact 3b of the pair on the right side. On the contrary, the end 5b of the movable rod 5 on the Figure 1 left side is away from the corresponding transverse wall 23 of the housing, thus releasing the air volume of the cut-off chamber CC and exposing the upstream fixed contact 3a and the downstream fixed contact 3b of the pair on the left side to possibly guide an arc E between them, as Figure 2 can be seen in. Therefore, in this left hand part of the housing 2, when the movable rod 5 is in the open position, the dielectric separation or dielectric barrier between the upstream fixed contact 3a and the downstream fixed contact 3b is broken, which limits the electrical performance of the cut-off device and poses an electrical risk to personnel and downstream equipment.

[0005] Publication EP270389A1 describes a multi-pole rotary switch, whose rotatable moving rod includes a metallic ground shield, and is said to provide a disconnection function in order to maintain isolation between the input and output terminals of the switch. However, this solution is limited to rotary cut-off modules and is not suitable for linear cut-off modules.

[0006] Publications US2007911A and FR2694444A1 describe linear cut-off modules equipped with electrically insulating shielding devices, whose performance depends on the position of the movable rod. SUMMARY OF THE INVENTION

[0007] The object of the present invention is to overcome these drawbacks by proposing a deformable dielectric barrier between the movable rod and the housing of the cut-off module, which is capable of maintaining the dielectric properties necessary to achieve the expected electrical performance of the module, regardless of the position of the movable rod.

[0008] To this end, the present invention relates to a cut-off module of the type indicated in the preamble, characterized in that it includes an electrically insulating shielding device arranged in the housing between an upstream fixed contact and a downstream fixed contact of the at least one pair of fixed contacts, the shielding device including a fixed end fixed to the housing and a movable end fixed to the movable device, and its length being capable of varying between an extended position when the movable device is in the open position and a retracted position when the movable device is in the closed position, so as to create a dielectric barrier between the upstream fixed contact and the downstream fixed contact of the at least one pair of fixed contacts.

[0009] In a first embodiment, the shielding device may have a telescopic configuration. In this case, it may include at least two segments, including a fixed segment fixed to the housing and a movable segment fixed to the movable device. The shielding device may further include at least one intermediate segment that slides relative to the fixed segment and the movable segment.

[0010] In this embodiment, the shielding device advantageously includes translational abutments, which are arranged to define the extended position and are respectively provided between different segments.

[0011] Preferably, the shielding device and the housing have respective complementary guides, which are arranged to guide the translational sliding of the movable segment and / or the intermediate segment relative to the housing.

[0012] In a second embodiment, the shielding device is capable of being wound and includes at least one film wound around a rotary wheel shaft fixed to the housing, the film including a fixed end fixed to the housing and a movable end fixed to the movable device.

[0013] In the third embodiment, the shielding device may be extendable and include at least one pleated film, which includes a fixed end fixed to the housing and a movable end fixed to the movable device. Description of the Drawings

[0014] In the following description of several embodiments given by way of non-limiting example with reference to the accompanying drawings, the invention and its advantages will become more apparent, in the drawings:

[0015] Figure 1 is a perspective view of a cutting module according to the prior art, the cutting module being in the open position and without the upper part of the housing;

[0016] Figure 2 is Figure 1 a top view of the cutting module of

[0017] Figure 3 is a perspective view showing a cutting module according to the invention similar to that of Figure 1 in the open position and equipped with a shielding device in the extended position;

[0018] Figure 4 is a view similar to that of Figure 3 showing the cutting module in the closed position and the shielding device in the retracted position;

[0019] Figure 5 is Figure 3 an exploded view of the cutting module of

[0020] Figure 6 is Figure 3 a cross-sectional view of the cutting module of

[0021] Figure 7 is a cross-sectional view along the horizontal section VII-VII of the left hand part of the cutting module of Figure 3 in the open position;

[0022] Figure 8 is a view similar to that of Figure 4 a cross-sectional view along section VIII-VIII of the left hand part of the cutting module of Figure 7 in the closed position;

[0023] Figure 9 is a cross-sectional view along the vertical section IX-IX of the left hand part of the cutting module of Figure 3 in the open position;

[0024] Figure 10 is a cross-sectional view along section X-X of the left hand part of the cutting module of Figure 4 in the closed position and similar to the view of Figure 9views similar to the view;

[0025] Figure 11 is an exploded view of a cutting module and a shielding device according to a first variant of the present invention;

[0026] Figure 12 is of Figure 11 a cutting module and a shielding device in the open position;

[0027] Figure 13 is a perspective view of a cutting module and a shielding device according to a second variant of the present invention; and

[0028] Figure 14 is a view similar to the view of Figure 13 a cutting module and a shielding device according to a third variant of the present invention. Detailed Description

[0029] In the exemplary embodiments shown, the same elements or parts have the same reference numerals. Furthermore, terms with relative meanings (such as vertical, horizontal, right, left, front, rear, above, below, etc.) must be interpreted as being in the normal use conditions of the present invention and as shown in the drawings. The axes X, Y, and Z are themselves defined by the Figure 1 orthogonal reference system shown. In addition, the geometric positions indicated in the description and claims (such as "perpendicular", "parallel", "symmetric") are not limited to the strictly geometric defined meanings, but cover approximate geometric positions, i.e., within a certain tolerance acceptable in the technical field under discussion, without affecting the results obtained. Such a tolerance is specifically introduced by the adverb "substantially", and this term does not have to be repeated before each adjective.

[0030] Refer to Figures 3 to 14, the electric cut-off module 10 according to the present invention comprises an electrically insulating housing 2 consisting of the following two half-housings: a lower half-housing 20 and an upper half-housing 21, which are assembled and fixed by any known means (such as screw fastening members (not shown)). The cut-off module 10 comprises at least one pair of fixed contacts 3 (two pairs of fixed contacts 3 in the example shown), and if the current flows from top to bottom in the figure, each pair comprises an upstream fixed contact 3a and a downstream fixed contact 3b. Each fixed contact 3 is generally constituted by a strip 30 made of a conductive material, and comprises a connection pad 31 outside the housing 2, and the connection pad is provided with holes 32 for fixing a power cable (not shown). The cut-off module 2 comprises at least one movable contact 4, and in the example shown there are two movable contacts 4, which are carried and fixed to a movable device 5 commonly called a movable rod. Each movable contact 4 is generally constituted by two strips 40 made of a conductive material, and the two strips are superposed and fixed to each other by a spring member 41 so as to form a clamp capable of being fitted onto the corresponding strip 30 of the fixed contact 3. This type of docking is called a sliding contact; however, this example is not restrictive.

[0031] The movable device 5 carrying the movable contact 4 is mounted in the housing 2 so as to be translatable relative to the pair of fixed contacts 3 in the direction of arrow T between a disconnected position ( Figure 3 ) and a closed position ( Figure 4 ), in the disconnected position, the electrical contacts are disconnected and the circuit is interrupted, and in the closed position, the electrical contacts are closed and a circuit is formed. For this purpose, the housing 2 and the movable device 5 comprise complementary mating shapes so as to ensure the guiding function of translation along the longitudinal axis Y of the housing; examples are grooves and ribs. They may also comprise end-of-travel abutments so as to define the limit positions of the movable device 5, which correspond to the disconnected position ( Figure 3 ) and the closed position ( Figure 4 ); examples are shoulders with complementary shapes.

[0032] Each pair of fixed contacts 3 and its corresponding movable contact 4 define a cut-off area therebetween, in which an arc may extend, especially when the circuit is disconnected. Therefore, the cut-off module 10 comprises at least one cut-off chamber, and in the example shown there are two cut-off chambers CC, which are defined by the inner wall of the housing 2 and each comprise a cut-off area for managing the arc so as to cut off the current.

[0033] The cut-off chamber CC located on the right side of the figure comprises a movable device 5 in the disconnected position. Therefore, it occupies the air volume of this cut-off chamber CC, thereby isolating the upstream fixed contact 3a from the downstream fixed contact 3b, forming a dielectric barrier, and promoting the extinction of the arc and the cut-off of the current.

[0034] According to the present invention, the cutting chamber CC located on the left side of the figure includes an electrically insulating shielding device 50, which is added to the housing 2 between the upstream fixed contact 3a and the downstream fixed contact 3b to achieve these same functions, namely occupying the air volume of the cutting chamber CC, isolating the upstream fixed contact 3a from the downstream fixed contact 3b, forming a dielectric barrier, and promoting the extinction of the arc and the interruption of the current. It can be recalled that in the absence of this shielding device 50, according to Figure 1 and Figure 2 , arcs E are formed between the upstream fixed contact 3a and the movable contact 4 and then between the movable contact 4 and the downstream fixed contact 3b respectively. Especially when the circuit is interrupted, there is a risk of displacement and direct establishment between the upstream fixed contact 3a and the downstream fixed contact 3b, so that the current flows when the cutting module 1 is in the open position, thus causing a dangerous situation to personnel and downstream equipment.

[0035] In Figures 3 to 10 the illustrated example, the shielding device 50 is structurally telescopic and includes at least two segments, and in this example, three segments 51, 52, 53. The number of segments is not restrictive. These segments are arranged to slide relative to each other and adapt the length of the shielding device 50 to the length of the cutting chamber CC according to the displacement of the movable device 5 between two extreme positions. Therefore, the shielding device 50 is designed to have a variable length between two end positions (i.e., the extended position when the movable device 5 is in the open position and the retracted position when the movable device 5 is in the closed position), so that the shielding device realizes its dielectric barrier function regardless of the position of the movable device 5.

[0036] The shielding device 50 has a three-dimensional polyhedral shape (specifically see Figure 5 and Figure 6 ), so as to match the shape of the inner wall of the housing 2 and occupy the main part of the volume of the cutting chamber CC. In addition, these three-dimensional shapes are complementary to the three-dimensional shape of the housing 2 and ensure the guiding function of translation along the longitudinal axis Y of the housing 2; examples are grooves and ribs.

[0037] In this example, the shielding device 50 includes:

[0038] - A fixed segment 51, which is fixed to the housing 2;

[0039] - A movable segment 53, which is fixed to the movable device 5; and

[0040] - An intermediate segment 52, which slides freely on the fixed segment 51 and in the movable segment 53,

[0041] The cross-section of the fixed section 51 is inscribed in the cross-section of the intermediate section 52, and the cross-section of the intermediate section 52 is inscribed in the cross-section of the movable section 53. In this configuration, the fixed section 51 is the smallest and is accommodated inside, while the movable section 53 is the largest and is arranged outside the shielding device 50. This example is not restrictive, as the opposite configuration may also be suitable, i.e., the movable section is the smallest and is accommodated inside, while the fixed section is the largest and is arranged outside the shielding device (see Figure 11 and Figure 12 ). In this example of the shielding device 50 with a telescopic configuration, when the movable device 5 is in the open position, the lengths of the sections 51, 52, 53 in the extended position must cover the total length of the cutting chamber CC without interruption. Additionally, when the movable device 5 is in the closed position, the lengths of these sections 51, 52, 53 must allow them to return to the retracted position within the remaining volume of the cutting chamber CC.

[0042] The fixed section 51 is formed by a hollow portion including a front wall 54 and a peripheral wall 55, which extends perpendicularly from the front wall 54 in the direction of the movable device 5 and on the longitudinal axis Y of the housing. The front wall 54 abuts against the corresponding transverse wall 23 of the housing. It is provided with a fixing lug 56, which will be fitted into a corresponding notch 57 provided in the housing 2 in order to hold this first section in a fixed position and create a fixing point for the shielding device 50. The fixing lug 56 may or may not extend inside the fixed section 51 in order to serve or not serve as a stiffener. The peripheral wall 55 has a polygonal cross-section, which is formed by a plurality of facets perpendicular to each other in order to form a U-shaped external rib, which includes at least two lateral ribs 58, a lower rib 59 and an upper rib 60 connected together respectively by L-shaped shoulders 61. All or part of the free edge of the peripheral wall 55 includes a translational abutment 62, which is arranged to cooperate with a complementary translational abutment provided on the intermediate section 52. The translational abutment 62 may be formed by, for example, a continuous or discontinuous edge folded outward at a right angle. Any other equivalent means may be suitable.

[0043] The intermediate section 52 is formed by an annular part which includes a peripheral wall 63 extending along the longitudinal axis Y of the housing. The peripheral wall 63 has a polygonal cross-section complementary to that of the fixed section 51, the polygonal cross-section being formed by a plurality of cross-sections at right angles to each other so as to generate on the one hand lateral grooves 64, lower grooves 65 and upper grooves 66 and on the other hand U-shaped lateral ribs 67, lower ribs 68 and upper ribs 69, these ribs being connected to each other by L-shaped shoulders 70 respectively. The lateral grooves 64, lower grooves 65 and upper grooves 66 are arranged to axially slide with an operating clearance on the lateral ribs 58, lower ribs 59 and upper ribs 60 of the fixed section 51. All or part of the free edge of the peripheral wall 63 on the side of the fixed section 51 includes a translational abutment 71 so as to cooperate with the translational abutment 62 of the fixed section 51, which is formed by a continuous or discontinuous inwardly folded edge and defines the extended position of the intermediate section 52. The lower rib 68 and the upper rib 69 are arranged to axially slide with an operating clearance in the lower groove 24 and the upper groove 25 of the housing 2. All or part of the free edge of the peripheral wall 63 on the side of the movable section 53 includes a translational abutment 72 so as to cooperate with a complementary translational abutment provided on the movable section 53.

[0044] The movable section 53 is formed by two halves, each half including a three-dimensional side wall 73, a part of which (on the left side in the figure) is solid and has a mating shape complementary to the corresponding face of the intermediate section 52, and the other part (on the right side in the figure) is perforated and includes two superimposed windows 74 separated by a fixed rod 75. Thus, each side wall 73 of the movable section is laterally assembled onto the movable device 5 and fastened thereto by a screw 76 or any other equivalent fastener, which may be removable or non-removable. For this purpose, the perforated part of each side wall 73 is assembled on the strip 40 of the movable contact 4 passing through the superimposed windows 74, and the solid part of each side wall 73 projects in the direction of the intermediate section 52 at the left-hand end 5a of the movable device 5. Each side wall 73 of the movable section 53 includes: an inner groove 77, which is arranged to slide on the corresponding lateral rib 67 of the intermediate section 52 by means of an operating clearance; and an outer groove 78, which opens an axial passage for the strip 30 of the corresponding fixed contact 3 during the displacement of the movable device 5. Part or all of the free edge of the side wall 73 of the movable section 53 includes a translational abutment 79 formed by a continuous or discontinuous inwardly folded edge so as to cooperate with the translational abutment 72 of the intermediate section 52, thereby defining the extended position of the intermediate section 52 and thus the extended position of the entire shielding device 50.

[0045] In addition, the combination of the U-shaped guiding ribs and grooves and the L-shaped shoulders respectively provided on the sections 51, 52, 53 of the shielding device 50 also ensures the centering of the sections relative to each other and relative to the housing 2.

[0046] The operation of the shielding device 50 is simple and automatic. When the movable device 5 is in the open position, the shielding device 50 is in the extended position, as Figure 3 , Figure 7 , Figure 9 shown: the axial positions of the segments 51, 52, 53 relative to each other are defined by the contacts between the corresponding translation abutments 62, 71 and 72, 79. When the movable device 5 is displaced from the open position to the closed position, the shielding device 50 folds to the retracted position, as Figure 4 , Figure 8 , Figure 10 shown. During its translation, the movable device 5 displaces the movable segment 53, whereby the movable segment slides on the intermediate segment 52 until it contacts the translation abutment 72 of the intermediate segment 52. Then, the movable segment 53 pushes the intermediate segment 52 that slides on the fixed segment 51 until it contacts the transverse wall 23 of the housing 2. Then, the movable device 5 is in the closed position and the shielding device 50 is in the retracted position. Conversely, when the movable device 5 is displaced from the closed position to the open position, it drives the movable segment 53, whereby the movable segment slides on the intermediate segment 52 until it hits the translation abutment 72 of the intermediate segment 52. Then, the movable segment 53 pulls the intermediate segment 52, which slides on the fixed segment 51 until it hits the translation abutment 62 of the fixed segment 51. Then, the movable device 5 is in the open position and the shielding device 50 is in the extended position.

[0047] Obviously, the architecture of the shielding device 50 described with reference to Figures 3 to 10 its translation guiding means, its translation abutments, its centering means, etc. is not restrictive; any other technically equivalent embodiment is suitable.

[0048] To illustrate possible alternative embodiments, Figure 11 and Figure 12 show another shielding device 80 of a telescopic configuration consisting of three segments, including:

[0049] - a fixed segment 81, which consists of two parallel side walls 82 and projects axially from the transverse wall 23 of the housing 2, forming an integral or non-integral part of the housing;

[0050] - a movable segment 83, which consists of an intermediate wall 84 and projects axially from the movable device 5, forming an integral or non-integral part of the movable device and terminated by a translation abutment 85; and

[0051] - an intermediate segment 86, which slides freely in the fixed segment 81 and on the movable segment 83.

[0052] As in the previous example, the intermediate section 86 is formed by an annular portion that includes a peripheral wall 87 extending along the longitudinal axis Y of the housing 2. The peripheral wall 87 has a polygonal cross-section complementary to the cross-sections of the housing 2, the fixed section 81, and the movable section 83 to provide mutual guidance in terms of translation and centering of the parts, thus ensuring the operating clearances that allow them to slide. In the same way, the sections 81, 83, 86 include translation abutments 85 that allow the shielding device 80 to move from a retracted position, where the sections 81, 83, 86 are stacked when the movable device 5 is in the closed position, to an extended position, where the sections 81, 83, 86 are end-to-end when the movable device 5 is in the open position ( Figure 12 ), and vice versa. In this variant, the movable section 83 slides within the intermediate section 86, and the intermediate section 86 slides within the fixed section 81. The intermediate section 86 can also cooperate with the translation abutments provided in the housing 2 to define its extended position.

[0053] By way of non-limiting example, Figure 13 and Figure 14 other alternative embodiments of the shielding devices 90, 100 according to the present invention are also illustrated, which enable the same functions as described above to achieve the same results, including creating a dielectric barrier between the upstream fixed contact 3a and the downstream fixed contact 3b in the cut-off chamber CC, regardless of the axial position of the movable device 5.

[0054] In Figure 13 , the shielding device 90 can be wound. It includes a flexible membrane 91 such that it can be wound around a rotary axle 92 fixed to the housing 2. The rotary axle 92 extends vertically between the lower housing 20 and the upper housing (not shown) near the transverse wall 23 of the housing. The rotary axle 92 is mounted in the housing to rotate freely about itself or includes a double axle, where the first axle of the double axle is fastened to the housing and the second axle of the double axle can move rotatably about the first axle. The shielding device 90 includes: a fixed end corresponding to the inner end of the membrane 91 fastened to the rotary axle 92; and a movable end 93 corresponding to the outer end of the membrane 91 fastened to the movable device 5 by any compatible fastening means. The movable end 93 of the membrane 91 can be clamped and joined between two jaws 94 fastened together by a screw 95 etc., and the jaws 94 are fixed to the corresponding left-hand end 5a of the movable device 5. The shielding device 90 also includes a spring member (not shown) that ensures that the membrane 91 can be wound around its rotary axle 92. Thus, when the movable device 5 is displaced to the open position ( Figure 13 ), the membrane 91 unwinds under the action of the traction exerted by it, and when the traction stops and the movable device 5 is displaced to the closed position, it automatically rolls up under the action of its return member.

[0055] In Figure 14In it, the shielding device 100 is extensible. It includes an accordion-folded membrane 101 which forms a deformable bellows between a fixed end 102 fixed to the transverse wall 23 of the housing 2 by a fixing tab 103 fitted into a notch 57 of the housing and a movable end 104 fixed to the movable device 5 by any compatible fastening means, for example between two jaws 105 fixed to the left-hand end 5a of the movable device 5. Thus, when the movable device 5 is displaced to the open position ( Figure 14 ), the membrane 101 unfolds or extends under the action of the traction exerted by it, and when the traction stops and the movable device 5 is displaced to the closed position, it automatically folds or contracts under its elastic action.

[0056] The present invention is obviously not limited to the described exemplary embodiments, but includes any modifications and variations within the scope of the appended claims, which are obvious to those skilled in the art. In addition, the technical features of the above various embodiments and variations can be combined wholly or only partly.

Claims

1. An electrical cut-off module (10), comprising: Electrically insulating housing (2); At least one pair of fixed contacts (3), which includes an upstream fixed contact (3a) and a downstream fixed contact (3b); And at least one movable contact (4), which is fixed to a movable device (5), the movable device (5) being translatable in the housing (2) between an open position and a closed position relative to the at least one pair of fixed contacts (3), the disconnection module being characterized in that it includes an electrically insulating shielding device (50, 80, 90, 100), the shielding device (50, 80, 90, 100) being arranged in the housing (2) between the upstream fixed contact (3a) and the downstream fixed contact (3b) of the at least one pair of fixed contacts (3), the shielding device including a fixed end fixed to the housing (2) and a movable end fixed to the movable device (5), and the length of the shielding device being capable of varying between an extended position when the movable device (5) is in the open position and a retracted position when the movable device (5) is in the closed position, so as to create a dielectric barrier between the upstream fixed contact (3a) and the downstream fixed contact (3b) of the at least one pair of fixed contacts (3).

2. The electric cut-off module according to claim 1, wherein The shielding device (50, 80) has a telescopic structure.

3. The electric cut-off module according to claim 2, characterized in that, The shielding device (50, 80) includes at least two segments (51, 53; 81, 83), the at least two segments (51, 53; 81, 83) including a fixed segment (51, 81) fixed to the housing (2) and a movable segment (53, 83) fixed to the movable device (5).

4. The electric cut-off module according to claim 3, characterized in that, The shielding device (50, 80) further includes at least one intermediate segment (52, 86), the at least one intermediate segment (52, 86) sliding relative to the fixed segment (51, 81) and the movable segment (53, 83).

5. The electrical cut-off module according to any one of claims 3 and 4, characterized in that The shielding device (50, 80) includes translational abutting portions (62, 71, 72, 79; 85), the translational abutting portions (62, 71, 72, 79; 85) being arranged to define the extended position and being respectively provided between different segments (51, 52, 53; 81, 83, 86).

6. The electric cut-off module according to claim 4, characterized in that The shielding device (50, 80) and the housing (2) respectively have complementary guides (24, 68; 25, 69), the guides (24, 68; 25, 69) being arranged to guide the movable segment (53, 83) and / or the intermediate segment (52, 86) to slide translationally relative to the housing (2).

7. The electric cut-off module according to claim 1, characterized in that, The shielding device (90) is capable of being wound and includes at least one film (91) wound around a rotating wheel shaft (92) fixed to the housing (2), the film (91) including a fixed end fixed to the housing (2) and a movable end (93) fixed to the movable device (5).

8. The electric cut-off module according to claim 1, characterized in that The shielding device (100) is extensible and includes at least one corrugated film (101), and the corrugated film (101) includes a fixed end (102) fixed to the housing (2) and a movable end (104) fixed to the movable device (5).

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