Control unit for an electrical circuit breaker and associated electrical circuit breaker

Abstract

Control unit for an electrical circuit breaker and associated electrical circuit breaker This control unit (20) comprises a housing (30) defining a front plane (P22), into which opens a housing (401) configured to receive a communication module (400) in the assembled position. Contact pads (36) are arranged at the bottom of the housing set back from the front plane (P22), so that a distance in the air between each contact pad and the front plane is greater than a class 2 insulation distance, according to standard IEC947-1:2019, under a voltage greater than 690V. The communication module comprises an enclosure (410), which delimits a cavity (411) configured to receive a wireless communication card (414) and which, in a position assembled to the housing, closes the housing, such that a creepage distance between each contact pad and the front plane is greater than a class 2 insulation distance under a voltage greater than 690V according to standard IEC947-1:2019.Figure for abstract: Figure 3.

Description

Title of the invention: Control unit for an electrical circuit breaker and associated electrical circuit breaker

[0001] The present invention relates to a control unit for an electric circuit breaker, as well as to an electric circuit breaker comprising such a control unit.

[0002] The present invention relates to a control unit for an electric circuit breaker, as well as to an electric circuit breaker comprising such a control unit.

[0003] Electrical circuit breakers are known, in particular from EP-0 843 332-A1, comprising a cut-off unit and an electronic control unit. Such a control unit is typically configured to measure in real time an operating state of the circuit breaker and to control the opening of the cut-off unit in the event of a malfunction of the circuit breaker. The control unit is received, reversibly, in a receptacle provided in the cut-off unit and is located on a front face of the circuit breaker, so that a user can read and / or adjust certain operating parameters of the electrical circuit breaker. The control unit is removable, so that a user can replace the control unit in the event of a malfunction, without having to disconnect the cut-off unit from the rest of the electrical installation.

[0004] Depending on the applications, the electrical circuit breaker operates under voltages of several hundred or even thousands of Volts, and under currents of up to several thousand Amperes. The electrical circuit breaker in general, and the control unit in particular, must have sufficient electrical insulation to guarantee the safety of people. For example, the IEC 947-1:2019 standard - tables 13 and 15 - defines insulation classes, which correspond to minimum distances to be respected between electrified points - or likely to be electrified - and the user. The insulation distances depend in particular on the insulation class sought, and the electrical voltage under which the electrical circuit breaker operates.The IEC 947-1:2019 standard mainly considers two voltage ranges, with a first range corresponding to a voltage less than or equal to 690V, and a second range corresponding to a voltage strictly greater than 690V. For illustration, for a voltage greater than 690V, insulation class 1 requires an air distance greater than 7 mm, and creepage distances greater than 10 mm. In English, the air distance is called "clearance distance", while the creepage distance is called "creep distance". Insulation class 2 doubles these distances. For a voltage less than 690V, insulation class 2 requires an air distance greater than 10 mm.

[0005] With the evolution of technologies and needs, it is advantageous to offer, at need, a communication interface, in particular a wireless communication interface, so that the user can transfer data from and / or to the control unit.

[0006] However, wireless communication interfaces require the presence of an antenna, which must be placed on the front of the electrical circuit breaker to operate satisfactorily. It is known to connect to the control unit an external communication module, which comprises a box receiving the antenna, and a connection cable, which is connected to the control unit from the rear, while the box is fixed on the front face of the circuit breaker. Such a solution is impractical, because it requires removing the control unit from its receptacle to make the connection. In addition, the box fixed on the circuit breaker is bulky and risks being damaged.

[0007] It is these needs that the invention more particularly intends to address, by proposing a modular control unit, which allows, if necessary, the installation of a communication module, without having to extract the control unit from the receptacle provided in the control unit, while guaranteeing the protection of people.

[0008] To this end, the invention relates to a control unit for an electrical circuit breaker, the control unit comprising: - a front face, which has a generally planar shape and which is geometrically supported by a front plane, the front face being orthogonal to a depth axis and defining a front direction oriented towards the user when the control unit is in a normal configuration of use, - a case, which is made of an insulating material and which delimits a housing, the housing being arranged set back from the front plane and opening onto the front face, - an electronic card, which comprises at least one connection zone with several juxtaposed electrical contact pads, the connection zone being located in the housing, - a communication module, which comprises an envelope delimiting a cavity, the cavity being configured to receive a wireless communication card comprising an antenna and complementary connectors, the envelope being made of an electrically insulating material and being configured to be received reversibly in the housing, the envelope of the communication module being in an assembled position,

[0009] in which: - each contact area is located set back from the front plane and is moved away from the front plane by a distance, measured along the depth axis, greater than a first predetermined threshold, - the first threshold is chosen so that a distance in the air between each contact pad and the front plane is greater than a class 2 clearance distance under a voltage above 690V, the clearance in the air and the class 2 clearance distance being according to IEC947-1:2019, and - when the enclosure is in the assembled position, the enclosure at least partially closes the housing, so that a creepage distance between each contact pad and the front plane is greater than a second predetermined threshold, the second threshold being equal to a class 2 insulation distance under a voltage greater than 690V according to standard IEC947-l:2019.

[0010] Thanks to the invention, the communication module can be easily installed from the front of the control unit, without having to dismantle the control unit from the cut-off unit. The electrical contact pads are all set back from the front face, which guarantees a sufficient insulation distance when the casing of the communication module is mounted on the housing of the control unit, whether the communication card is present or not. Thus, once installed, the communication module does not increase the size of the control unit, which thus remains compact.

[0011] According to advantageous but not obligatory aspects of the invention, such a unit of control may incorporate one or more of the following characteristics taken in isolation or in any technically admissible combination: - The first threshold is greater than or equal to 14 mm. - Each casing comprises a proximal wall, which is generally orthogonal to a main axis, and a peripheral wall, which projects from the proximal wall and which has a continuous contour around the main axis, the proximal wall and the peripheral wall together delimiting the cavity of the casing, the cavity emerging from the casing by a distal mouth, which is located opposite the proximal wall along the main axis, whereas, when the communication module is in the assembled configuration, the main axis is parallel to the depth axis, while the distal mouth is oriented towards the corresponding connection zone, the cavity masking the contact pads along the depth axis. - The second threshold is equal to 20 mm. - The communication module includes the communication board, which is received in the cavity. - The communication module comprises at least one complementary contact, which is made of metal, which is partially received in the cavity and which protrudes outside the casing through the distal mouth, while each complementary contact is configured to be connected, reversibly, to a respective electrical contact pad of the housing when the communication module is in assembled configuration.

[0012] The invention also relates to an electrical circuit breaker, which comprises: - a cut-off unit, comprising at least one cut-off device and an actuator, the cut-off device being triggerable by means of the actuator, - a copy of the control unit as described above,

[0013] in which: - the cut-off unit has a receptacle, which opens onto a front face of the cut-off unit, - the control unit is received in the receptacle of the cut-off unit, so that the front face of the control unit is substantially aligned with the front face of the cut-off unit.

[0014] Advantageously: - the cut-off unit comprises a front panel, which is removable from the rest of the cut-off unit, which is made of an electrically insulating material and which defines a portion of the front face of the cut-off unit, - the communication housing is a border housing, which is arranged on the edge of the front face, while the communication module has a recess, which is located set back from the front plane, - when the control unit is received in the receptacle and the faceplate is mounted on the cut-off unit, the faceplate at least partially covers the recess, so as to prevent the communication module from being removed from the rest of the control unit.

[0015] The invention will be better understood, and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a control unit and an electrical circuit breaker, in accordance with its principle, given solely by way of example and with reference to the appended drawings, in which:

[0016] - [Fig.l] [Fig.l] represents respectively, on two inserts a) and b), a view in perspective and a partially exploded perspective view of an electrical circuit breaker according to the invention, the electrical circuit breaker comprising a control unit, also according to the invention;

[0017] - [Fig.2] [Fig.2] is a perspective view of the control unit of [Fig.l];

[0018] - [Fig.3] [Fig.3] represents, on two inserts a) and b), a perspective view by partially exploded view of the control unit of [Fig.l], observed from two different viewing angles;

[0019] - [Fig.4] [Fig.4] represents, on two inserts a) and b), a section of the unit of control of [Fig.l], shown in two other configurations;

[0020] - [Fig.5] [Fig.5] represents respectively, on two inserts a) and b), a view in perspective and a section of the electrical circuit breaker in [Fig.l], some parts being hidden.

[0021] An electrical circuit breaker 10 is shown in [Fig.l]. The electrical circuit breaker 10, also simply called circuit breaker 10, is here a multi-pole circuit breaker, in particular a three-pole circuit breaker. The number of poles is not limiting. In a known manner, a multi-pole electrical circuit breaker comprises, for each electrical pole, input and output power terminals, which are respectively connected or electrically isolated from each other by a circuit breaker cut-off device. The cut-off device comprises, for example, separable movable contacts, which are received in a cut-off chamber of the electrical circuit breaker 10 and whose movements are controlled by an actuator. Thus, the cut-off device can be triggered by the actuator. The cut-off chambers are here materialized by three grids 12 visible on an upper face of the circuit breaker 10, the other elements of the cut-off device not being shown.

[0022] The electrical circuit breaker 10 is intended to be used within an electrical installation, for example to control the power supply of a machine tool. In a normal configuration of use, the electrical circuit breaker 10 is generally placed within an electrical cabinet, the electrical circuit breaker 10 having a front face 14, which is oriented towards the user standing in front of the electrical cabinet. The electrical cabinet is not shown.

[0023] The electrical circuit breaker 10 comprises a cut-off unit 16, which in particular comprises each of the cut-off chambers, as well as the cut-off device and the associated actuator.

[0024] The electrical circuit breaker 10 advantageously comprises a faceplate 18, which is removable from the rest of the cut-off unit 16. The faceplate 18 is made of an electrically insulating material and extends generally along a front plane P14, which defines a portion of the front face 14 of the electrical circuit breaker 10, and by extension of the cut-off unit 16. The faceplate 18 thus serves to protect the user of the circuit breaker 10. In [Fig.l] a), the faceplate 18 is shown assembled to the cut-off unit 16, which corresponds to a normal usage configuration of the circuit breaker 10. In [Fig.l] b), the faceplate 18 is distant from the cut-off unit 16, this configuration being found for example during maintenance of the cut-off unit 16

[0025] The electrical circuit breaker 10 also comprises a control unit 20. The control unit 10 is configured to analyze states of the cut-off unit 16 and is configured to trigger the actuator according to the results of these analyses, thus separating the separable contacts.

[0026] The control unit 20 comprising a front face 22. The front face 22 has a generally planar shape and is geometrically carried by a front plane P22, which is orthogonal to a depth axis A22 of the control unit 20. The front face 22 is oriented towards the user when the control unit 20 is in a normal configuration of use. The front face 22 thus defines a forward direction D22, which is parallel to the depth axis A22. The forward direction D22 is represented by an arrow. The notions of directions such as “forward”, “back”, “up”, “down”, etc., are defined in relation to the elements as represented in the drawings, knowing that it may be otherwise in reality.

[0027] The front panel 18 comprises a window 19, through which the front face 22 of the cutting unit 20 is visible. The window 19 is preferably closed by a transparent flap. The flap is not shown.

[0028] The control unit 10 is assembled to the cut-off unit 16 in a reversible manner. In the example of figures 1a) and 1b), the control unit 20 is shown in the configuration assembled to the cut-off unit 16. The control unit 20 is shown in isolation in [Fig.2].

[0029] The cut-off unit 16 provides a receptacle, which opens onto a front face 14 of the cut-off unit 16 and in which the control unit 20 is received, so that the front face 22 of the control unit 20 is substantially aligned with the front face 14 of the cut-off unit 16, as illustrated in particular in [Fig.l] a). The receptacle is not shown.

[0030] The control unit 20 will now be described with reference to FIGS. 2 to 4.

[0031] The control unit 20 comprises a housing 30, which is made of an insulating material and which forms a volume for receiving various components of the control unit 10. The housing 30 houses in particular an electronic card 32, which is partially visible in FIGS. 3 and 4. The electronic card 32 comprises in particular a printed circuit and several electronic components such as a microprocessor, etc.

[0032] In the illustrated example, the electronic card 32 comprises several portions, which are here connected to each other by communication buses. The communication buses are not shown. Optionally, one or more portions of the electronic card 32 are flexible. Alternatively, the electronic card 32 includes several portions which are not connected to each other by communication buses.

[0033] The housing 30 here includes a front subassembly 100. By extension, the subassembly 100 belongs to the control unit 20. The front subassembly 100 comprises a central portion 102, which is here configured to receive at least one human-machine interface element 104. A human-machine interface is also designated by its acronym HMI, or MHI in English. The human-machine interface elements 104 are also simply noted “HMI elements” 104. In the illustrated example, the central portion 102 comprises several HMI elements 104. The HMI elements 104 include here three indicator lights 104A, a transparent portion 104B, through which a screen can be observed, and four buttons 104C. These examples are not limiting, the type, number and arrangement of the HMI elements 104 can be changed during the design of the front subassembly 100.

[0034] The front subassembly 100 is advantageously assembled to the rest of the control unit 20, in particular to the housing 30, in a reversible manner. It is thus possible to replace the front subassembly 100 in the event of a malfunction. The central portion 102 thus forms a portion of the front face 22 of the control unit 120.

[0035] The housing 30 comprises at least one housing 98, here three housings, each housing being arranged set back from the front plane P22 and opening onto the front face 22.

[0036] The control unit 20 also comprises at least one functional module 99, here three functional modules 99, each housing being associated with a respective functional module. Each functional module 99 is thus configured to be received reversibly in the associated housing, the functional module 99 considered being in an assembled configuration.

[0037] Preferably, the control unit 20 comprises several functional modules 99. In the illustrated example, the control unit 20 comprises three functional modules 99, which are different from each other and which include a first module 200, which is here a battery module, a second module 300, which is here a wired connection module, and a third module 400, which is here a wireless communication module. The second functional module 300 is here hidden by a cover 308. Each functional module 99 is associated with a respective housing 98. Each functional module 99 is configured to be received reversibly in the associated housing 98, the functional module 99 then being in an assembled configuration.In the illustrated example, each functional module 99 is configured to be inserted into the corresponding housing 98 according to an insertion movement, which is a translation movement parallel to the depth axis A22 and oriented in a rear direction, that is to say in a direction opposite to the front direction D22.

[0038] We are interested here in the third communication module 400, the invention being of course able to be implemented in the absence of the other functional modules. The third communication module 400 is also simply called “communication module 400”. The housing 98 associated with the third communication module 400 is also called communication housing 401.

[0039] The housing 30 delimits the communication housing 401, which is arranged set back from the front plane P22 and which opens onto the front face 24. In other words, the communication housing 401 is open in the front direction D22. In the example illustrated, the communication housing 401 is arranged on an edge of the front face 24, that is to say that the communication housing 401 is also open in a direction radial to the front direction D22. In the example illustrated, the communication housing 401 is open towards the top of the control unit 20. The communication housing 401 is thus called “border housing”.

[0040] The electronic card 32 comprises a connection area 34, which comprises several juxtaposed electrical contact pads 36. The connection area 34 here comprises five aligned contact pads 36. The connection area 34 is located in the connection housing 401, the electronic card 32 here forming a bottom of the connection housing 401.

[0041] Each contact pad 36 comprises a substantially flat conductive element located on the surface of the electronic card 32, each contact pad 36 being suitable for being electrically connected to a respective complementary connector 417 belonging to the communication module 400, each complementary connector 417 bearing on the corresponding contact pad 36. The complementary connectors 417 are detailed later. Advantageously, the contact pads 36 are part of the printed circuit of the electronic card 32, in other words are manufactured at the same time as the electronic card 32.

[0042] Each contact pad 36 of the connection zone 34 is located set back from the front plane P22 and is distant from the front plane P22 by a distance, measured along the depth axis, greater than a first predetermined threshold SI. The first threshold SI is chosen so that a distance in the air between each contact pad 36 and the front plane P22 is greater than a class 2 insulation distance under a voltage greater than 690V, the distance in the air and the class 2 insulation distance being according to the standard IEC947-1:2019. Schematically, the distance in the air between two points is the shortest path between these two points, while bypassing any obstacles.

[0043] Preferably, the first threshold SI is greater than or equal to 14 mm.

[0044] The communication module 400 is now described.

[0045] The communication module 400 is configured to be received in the communication housing 401 in an assembled position of the communication module 400, the control unit 20 then being in an assembled configuration. The communication module 400 comprises a body 410, which is made of an electrically insulating material.

[0046] The body 410 is shown in isolation in [Fig. 3], and in assembled configuration in [Fig. 2]. With reference to Figure 9 where the body 410 is visible in section, the body 410 comprises a main portion delimiting a cavity 411, which is open in a rear direction of the body 410, the rear direction being opposite the front direction D22 when the communication module 400 is assembled to the housing 30. Optionally, the communication module 400 also advantageously comprises a communication card 414, which is configured to be received in the cavity 411. The communication card 414 advantageously comprises an antenna 416, and several copies of the complementary contacts 417. The complementary contacts 417 are here pins 417, preferably telescopic pins - also called "pogo-pin" in English -, each pin 417 being configured to be connected to a respective contact pad 36 according to a movement comprising a translation component.

[0047] The body 410 here has an elongated shape and extends parallel to a transverse axis T410 of the body 410, as illustrated in [Fig. 5]. When the body 410 is assembled to the housing 30, the transverse axis T410 is parallel to a transverse axis of the housing 30, and by extension of the control unit 20, the transverse axis being parallel to the front plane P22.

[0048] The body 410 has, in section along a plane orthogonal to the transverse axis T410, in other words in cross section, a substantially constant section. The body 410 comprises a proximal wall 41 IA, which is located on the user side when the connection module 300 is in the assembled position, two side walls 41 IC, which extend orthogonally to the transverse axis T410 and which are connected to each other by the proximal wall 41 IA. The body 410 also comprises an upper wall 411D and a lower wall 411E, which are parallel to each other and which are connected to each other, on the one hand, by the proximal wall 41 IA and, on the other hand, by the side walls 411D. The proximal wall 41 IA is here planar and generally orthogonal to a main axis A411. When the communication module 400 is in the configuration assembled to the housing 30, the main axis A411 is parallel to the depth axis A22.The proximal wall 411A, the side walls 411C, the upper wall 411D and the lower wall 411E together form an envelope which delimits the cavity 411. The side walls 411C, the upper wall 411D and the lower wall 411E together form a peripheral wall of the envelope, the peripheral wall extending in projection from the proximal wall 411A. The cavity 411 opens from the envelope of the communication module 400 by a distal mouth 418, which is located opposite the proximal wall along the main axis A411.

[0049] Advantageously, the peripheral wall has a continuous contour around the main axis A411.

[0050] When the communication module is in the assembled configuration, the distal mouth 418 is oriented towards the connection zone 34, the cavity 411 masking the contact pads 36 along the depth axis A22, while a creepage distance from each contact pad 36 to the front plane P22 is greater than a second predetermined threshold S2, the second threshold S2 being greater than the first threshold SL. Preferably, the second threshold S2 is greater than a class 2 insulation distance as defined in the standard IEC947-1:2019. Preferably, the second threshold S2 is equal to 20 mm.

[0051] The body 410 also comprises attachment means 412 for holding the communication module 400 in the assembled position. The attachment means 412 are here two elastic clips, which here extend rearwardly from each of the lateral faces 41 IC. The attachment means 412 are advantageously reversible, so that a user can extract the communication module 400 from the communication housing 401, for example to replace the communication module 400 in the event of malfunction.

[0052] Advantageously, the proximal wall 41 1A is located set back from the front plane P22, while the body 410 also comprises a projection 413A, which extends from the proximal wall 411A in the front direction D22, the proximal wall 411A and the projection together delimiting a recess 413B of the body 410, and by extension of the third communication module 400. The recess 413B is thus located set back from the front plane.

[0053] The projection 413A here has, in cross-section, a continuous L-shaped profile. The projection 413A is located at a distance from a junction edge between the proximal wall 411A and the upper wall 411D, so that the recess 413B is open both towards the front and towards the top of the control unit 20 when the body 410 is in the assembled position on the housing 30.

[0054] When the control unit 20 is received in the receptacle of the cut-off unit 16 and the faceplate 18 is mounted on the cut-off unit, the faceplate covers 18 the recess 413B, so as to prevent the communication module from being disassembled from the rest of the control unit 20, as illustrated in [Fig. 5]. More precisely, an edge 19A of the window 19 of the faceplate 18 cooperates with the recess 413B, so as to limit the movements of the body 410 relative to the housing 30 of the control unit 20, in particular the forward or upward translational movements. The communication module 400 is thus kept assembled to the housing 30.

[0055] It is thus understood that when the control unit 20 is received in the receptacle of the cut-off unit 16, as long as the faceplate 18 is assembled to the cut-off unit 16, the faceplate prevents both the disassembly of the communication module 400 from the control unit 20, and the disassembly of the control unit 20 from the cut-off unit 16.

[0056] The complementary contacts 417 are here pins 417, preferably telescopic pins - also called "pogo-pin" in English -, each pin 417 being configured to be connected to a respective contact pad 36 according to a translational movement. Advantageously, when the communication card 414 is received in the cavity 411, only the complementary contacts 417 protrude from the cavity 411, outside the casing, through the distal mouth 418. The telescopic pins 417 make it possible to accommodate dimensional clearances when the module communication 400 is in assembled position.

[0057] When the communication card 414 is received in the cavity 411, the antenna 416 is advantageously located opposite the proximal wall 41 1A, so as to promote the transmission of the electromagnetic waves emitted or received by the antenna 416.

[0058] When the communication module 400 is received in the corresponding communication housing 401, the casing at least partially closes the associated communication housing 401, so that a creepage distance between each contact pad 36 and the front plane P22 is greater than a class 2 insulation distance under a voltage greater than 690V, the creepage distance being according to the IEC947-L2019 standard. The class 2 insulation distance is obtained both when the communication card 414 is present and when the communication card is absent. It is thus possible to add the communication card, according to the user's needs, to a control unit 20 which would initially be devoid of it, even after the control unit 20 and the circuit breaker 10 have been put into service, without changing the safety level of the circuit breaker 10.

[0059] In particular, when the casing of the communication module 400 is in the assembled position, the lower wall 411E extends towards the electronic card 32, one end of the lower wall 411E being located opposite the electronic card.

[0060] The embodiments and variants mentioned above can be combined with each other to generate new embodiments of the invention.

Claims

Claims

1. A control unit (20) for an electrical circuit breaker (10), the control unit (20) comprising: • a front face (22), which has a generally planar shape and which is geometrically supported by a front plane (P22), the front face (22) being orthogonal to a depth axis (A22) and defining a front direction (D22) oriented towards the user when the control unit (20) is in a normal configuration of use, • a housing (30), which is made of an insulating material and which delimits a housing (401), the housing (401) being set back from the front plane (P22) and opening onto the front face (22), • an electronic card (32), which comprises at least one connection zone (34) with several juxtaposed electrical contact pads (36), the connection zone (34) being located in the housing (401), • a communication module (400), which comprises an envelope delimiting a cavity (411), the cavity (411) being configured to receive a wireless communication card (414) comprising an antenna (416) and complementary connectors (417), the envelope being made of an electrically insulating material and being configured to be received reversibly in the housing (401), the envelope of the communication module (400) being in an assembled position, in which: • each contact area (36) is located set back from the front plane (P22) and is moved away from the front plane (P22) by a distance, measured along the depth axis (A22), greater than a first predetermined threshold (SI), • the first threshold (SI) is chosen so that a distance in the air between each contact pad (36) and the front plane (P22) is greater than a class 2 insulation distance under a

2.

3.

4. voltage greater than 690V, the clearance in the air and the class 2 insulation distance being according to standard IEC947-1:2019, and when the enclosure is in the assembled position, the enclosure at least partially closes the housing (401), so that a creepage distance between each contact pad (36) and the front plane (P22) is greater than a second predetermined threshold, the second threshold being equal to a class 2 insulation distance under a voltage greater than 690V according to standard IEC947-1:2019. Control unit (20) according to claim 1, wherein: the first threshold (SI) is greater than or equal to 14 mm. Control unit (20) according to any one of claims 1 or 2, wherein: each casing comprises a proximal wall (411 A), which is generally orthogonal to a main axis (A411), and a peripheral wall, which projects from the proximal wall (411 A) and which has a continuous contour around the main axis (A411), the proximal wall (411 A) and the peripheral wall together delimiting the cavity (411) of the casing, the cavity (411) emerging from the casing via a distal mouth (418), which is located opposite the proximal wall (41 IA) along the main axis (A411), when the communication module (400) is in the assembled configuration, the main axis (A411) is parallel to the depth axis (A22), while the distal mouth (418) is oriented towards the corresponding connection zone (34), the cavity (411) masking the contact pads according to the depth axis (A22). Control unit (20) according to any one of claims 1 to 3, in which: the second threshold is equal to 20 mm.

5. Control unit (20) according to any one of claims 1 to 4, wherein: • the communication module (400) comprises the communication card (414), which is received in the cavity (411).

6. Control unit (20) according to claim 5, in which: • the communication module (400) comprises at least one complementary contact (417), which is made of metal, which is partially received in the cavity (411) and which protrudes outside the casing through the distal mouth (418), • each complementary contact (417) is configured to be connected, reversibly, to a respective electrical contact pad (36) of the housing (401) when the communication module (400) is in the assembled configuration.

7. Electrical circuit breaker (10), comprising: • a cut-off unit (16), comprising at least one cut-off device and an actuator, the cut-off device being triggerable by means of the actuator, • an example of the control unit (20) according to any one of claims 1 to 6, in which: • the cut-off unit (16) provides a receptacle, which opens onto a front face (14) of the cut-off unit, • the control unit (20) is received in the receptacle of the cut-off unit, so that the front face (22) of the control unit (20) is substantially aligned with the front face of the cut-off unit.

8. Electrical circuit breaker (10) according to claim 7, in which: • the cut-off unit (16) comprises a faceplate (18), which is removable from the rest of the cut-off unit, which is made of an electrically insulating material and which defines a portion of the front face (14) of the cut-off unit (16), the communication housing (401) is a border housing (401), which is arranged at the edge of the front face (22), while the communication module (400) has a recess (413B), which is located set back from the front plane (P22), when the control unit (20) is received in the receptacle and the faceplate (18) is mounted on the cut-off unit (16), the faceplate at least partially covers the recess (413B), so as to prevent the communication module (400) from being dismantled from the rest of the control unit (20).

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