JP6419801B2 - Electrical contactor and method for controlling such contactor - Google Patents

Description

  The present invention relates to an electrical contactor and a method for controlling such a contactor.

  The electrical contactor includes at least a pair of fixed contacts and a contact that is movable between a closed position and an open position with respect to each pair of fixed contacts. More specifically, the fixed contacts are electrically connected when the movable contact is in the closed position and are electrically isolated from each other when the movable contact is in the open position. The contactor also includes a contact holder configured to hold the movable contact, and a first magnetic unit that is integral with the contact holder and disposed opposite the movable contact. The contactor includes an actuator configured to control movement of the contact holder between a first position corresponding to the closed position of the movable contact and a second position corresponding to the open position of the movable contact.

  Contactors are typically included in electrical installations and are placed downstream of protective devices such as fuses and circuit breakers. These protection devices are designed to protect the equipment when a short circuit occurs when the movable contact is in the closed position and while the movable contact is closed.

  When a short circuit current, or more generally an overcurrent, flows through a movable contact and a fixed contact, the movable contact and the fixed contact receive a repulsive force, and as a result, the movable contact tends to open in an unfavorable manner due to electrodynamic effects It is generally known that there is. Thus, once the current reaches the overcurrent threshold, the repulsive force is strong enough to open the movable contact, resulting in an electric arc between the fixed contact and the movable contact. When the current decreases, whether it is natural (sinusoidal current) or due to current limiting due to the operation of the circuit breaker, the repulsive force decreases and the movable contact closes. However, when the movable contact opens, the contact disk positioned on the fixed contact and on the movable contact is significantly heated by the electric arc and becomes pasty or even liquid. For this reason, there is a significant risk that the movable contact and the fixed contact are welded in addition to other risks leading to damage to the contactor due to the stress caused by the electric arc and contact wear.

  Thus, a recurring challenge in the field of electrical contactors is to coordinate the contactor with a protective device, i.e. not to endanger the electrical installation or its user.

  In the field of contactors, a contactor in which a magnetic element is connected to a movable contact holder by a magnetic pad is known from US Pat. In this type of contactor, when the movable contact closes, the magnetic element provides a magnetic force to hold the movable contact in the closed position. The contactor is adjusted so that the magnetic pad is separated from the movable contact holder when a predetermined fault current value flows through the fixed contact and the corresponding movable contact. When this fault current value is reached, the magnetic element is removed from the movable contact holder and becomes inoperable. As a result, since the magnetic member does not hold the movable contact in the closed position, a sudden change in the repulsive force occurs between the fixed contact and the movable contact. In this way, the movable contact is rapidly opened by a repulsive force applied between the fixed contact and the movable contact.

  However, the contactor needs to be adjusted to cause sufficient repulsion when the magnetic pad is released for a given fault current value. This ensures that the movable contact opens completely without being welded or damaged. The removal of the magnetic pad for a given fault current value is a mechanical separation method and the repulsive force caused by the pad is particularly difficult to obtain because it is particularly temperature sensitive among several. It is. Also, complete opening of the movable contact is only guaranteed for high fault current values with a large repulsive force between the fixed contact and the movable contact.

French Patent Application Publication No. 2559308

  The object of the present invention is therefore to propose an electrical contactor that guarantees a better coordination with a protective device such as a circuit breaker, i.e. when a fault current flows, the contactor for a wider range of fault currents Is to limit the risk of welding or breakage.

  To this end, the present invention includes at least a pair of fixed contacts and a movable contact between a closed position and an open position with respect to the pair or each pair of fixed contacts. The present invention relates to an electrical contactor that is electrically connected to one another via movable contacts and is electrically insulated from one another when the movable contacts are in an open position. The contactor further includes a contact holder configured to hold the one or each movable contact, preferably by a spring. The contact holder is movable between a first position corresponding to the closed position of the movable contact and a second position corresponding to the open position of the movable contact. It includes a first magnetic part installed opposite to the contact. The contactor further flows through each movable contact associated with each pair of fixed contacts and an actuator configured to control movement of the movable contact holder between the first and second positions according to a control law. A current sensor configured to measure current. According to the present invention, the actuator control law includes moving the movable contact holder from the first position to the second position when a current value greater than a predetermined threshold is measured by the current sensor, One magnetic part is moved by the movable contact holder and abuts against the movable contact so as to go to the open position.

  According to the present invention, each movable contact remains in the closed position without welding when the value of the current flowing through the fixed contact and each movable contact is below an associated predetermined threshold. When the value of the current flowing through the stationary contact and each associated movable contact exceeds a predetermined threshold, the opening of the movable contact is ensured by moving the movable contact holder from the first position to the second position. Thus, when a current value exceeding a predetermined threshold appears, the movable contact opens rapidly without contactor welding or breakage.

According to another preferred aspect of the invention, the electrical contactor further comprises one or more of the following features used alone or in a technically acceptable combination.
The electrical contactor comprises a coil and an electronic control module, wherein the electronic control module is configured to control the current flowing through the coil according to a control law, the coil being adapted to the movable contact holder according to the current flowing through the coil; Configured to control movement,
A current sensor is positioned around one fixed contact with respect to said pair or each pair of fixed contacts;
When the current sensor measures a current less than a predetermined threshold and the movable contact is in the closed position, the corresponding first magnetic part forms a first gap with the movable contact;
The one or each first magnetic part is integral with the movable contact holder;
The one or each first magnetic part is integral with the movable contact holder by overmolding;
The movable contact holder maintains the one or each movable contact by a spring, and for the one or each movable contact, the contactor includes a second magnetic part that is integral with the movable contact and abuts against the spring; When the movable contact is in the closed position, the second magnetic part forms a second gap with the first magnetic part,
-When the movable contact is in the closed position, the corresponding first magnetic part and the second magnetic part are configured to apply a closing force to the movable contact, which attempts to hold the corresponding movable contact in the closed position;
-When the movable contact is in the closed position, the corresponding first magnetic part and second magnetic part exert a separating force on the movable contact holder in the direction in which the movable contact holder moves from the first position to the second position. Configured to exert.

The present invention includes at least a pair of fixed contacts and a movable contact between the closed position and the open position with respect to the pair or each pair of fixed contacts, and the fixed contact is movable when the movable contact is in the closed position. It also relates to a method for controlling contactors that are electrically connected to each other via contacts and the stationary contacts are electrically isolated from each other when the movable contacts are in the open position. The contactor further includes a contact holder configured to hold the one or each movable contact, preferably by a spring, the contact holder having a first position corresponding to a closed position of the movable contact and an open position of the movable contact. It is movable between the 2nd position corresponding to. The contactor also includes a first magnetic part that is integral with the movable contact holder and disposed opposite the one or each movable contact. The contactor also includes an actuator configured to control movement of the movable contact holder between the first position and the second position according to a control law, and a current flowing through each pair of fixed contacts and each associated movable contact. A current sensor configured to measure as well. According to the invention, when the one or each movable contact opens, the method includes the following steps. That is,
-A) measuring the current flowing through each pair of fixed contacts and each associated movable contact;
-B) comparing the measured value with a predetermined threshold;
-C) When the measured value exceeds a predetermined threshold value, the movement of the movable contact holder is instructed from the first position to the second position, and then the first magnetic part is moved by the movable contact holder, Abutting in the direction of the open position.

According to another preferred aspect of the invention, the method for controlling an electrical contactor further comprises one or more of the following features used alone or in a technically acceptable combination.
During step c), the first magnetic part exerts a separating force in the direction of movement on the movable contact holder;
The contactor comprises a second magnetic part for said one or each movable contact, this second magnetic part increasing the opening force exerted on the movable contact holder in its direction of movement during step c) .

  In light of the following description, given solely by way of non-limiting example and with reference to the accompanying drawings, the invention will be better understood and other advantages will become apparent.

It is a schematic perspective view of the three-phase contactor by this invention. It is a perspective view of the switching block of the contactor of FIG. It is sectional drawing along the plane III of FIG. It is sectional drawing along the plane IV of FIG. FIG. 4 is a similar view of FIG. 3 with the movable contact in the open position. FIG. 5 is a similar view of FIG. 4 with the movable contact in the open position. A series of four time bases each representing the current flowing through the movable contact associated with the fixed contact, the arc voltage between the movable contact associated with the fixed contact, the movement of the movable armature of the actuator, and the movement of the movable contact It is a curve. It is a flowchart of the control method by this invention.

  In FIG. 1, the three-phase contactor 10 includes three switching blocks 12, an actuator 14, three current sensors 16, and an electronic control module 18. The contactor 10 includes a switching block 12 and a current sensor 16 for each phase.

  Alternatively, the electronic control module 18 includes a control member (not shown) and a processing member.

  The switching block 12 shown in FIG. 2 includes two fixed contacts 22 and a movable contact 24 that moves between a closed position and an open position. The fixed contacts 22 are electrically connected to each other via the movable contact 24 when the movable contact 24 is in the closed position, and are electrically insulated from each other when the movable contact 24 is in the open position.

  Z indicates the vertical direction in which each movable contact moves.

  X indicates a longitudinal direction along which the pair of fixed contacts 22 extend, and the longitudinal direction X is perpendicular to the vertical direction Z.

  Y indicates a transverse direction along which the switching blocks 12 are arranged, and the transverse direction Y is perpendicular to the vertical direction Z and the longitudinal direction X.

  The switching block 12 includes a contact holder 26 that holds each movable contact 24 and is configured to drive the movable contact 24 by translation along the vertical direction Z.

  The switching block 12 includes a first magnetic unit 28 and a second magnetic unit 30.

  The actuator 14 includes a movable ferromagnetic armature 32 mechanically connected to the contact holder 26, a ferromagnetic portion 33, and a coil 34 configured to control the movement of the movable armature 32. The coil 34 is connected to the electronic module 18 via an electrical connection 36.

  The actuator 14 is configured to control the movement of the movable armature 32 and the movement of the contact holder 26 by mechanical connection according to a control law.

  Each current sensor 16 is configured to measure the current flowing through a corresponding pair of fixed contacts 22. Each current sensor 16 is positioned around one of the two fixed contacts 22 adapted to each switching block 12.

  The control module 18 compares the current measured by each current sensor with a predetermined threshold value, and controls the current flowing through the coil 34 according to the control law when the current measured by the at least one current sensor 16 is larger than the predetermined threshold value. Then, the current flowing through the coil 34 is interrupted.

  Each fixed contact 22 includes a contact disk 38. Both fixed contacts 22 adapted to each switching block 12 correspond to a current input terminal and a current output terminal, respectively.

  Each movable contact 24 includes a central portion 39 and two contact disks 40.

  The contact holder 26 is movable between a first position corresponding to the closed position of the movable contact 24 and a second position corresponding to the open position of the movable contact 24. The movable contact holder 26 supports the movable contact 24 by a first spring 42 positioned between the movable contact holder 26 and the second magnetic unit 30. Here, the second magnetic unit 30 is mechanically connected to or in contact with the movable contact 24.

  The first magnetic unit 28 is positioned to face the second magnetic unit 30 and the movable contact 24. More specifically, as shown in FIG. 4, the first magnetic unit 28 includes a central region 44, two side branches 46 and 48, and an opening 50 in a vertical plane including the transverse direction Y corresponding to the cross section IV. A U-shape that defines The first magnetic unit 28 is integral with the movable contact holder 26. The first magnetic part 28 is preferably overmolded in the movable contact holder 26 or simply held by the movable contact holder 26. The first magnetic part 28, more specifically the central region 44 thereof, forms a first gap E1 with the movable contact 24 when the movable contact 24 is in the closed position. Due to the first gap E1, a margin for wear of the contact disks 38, 40 is ensured.

  The second magnetic part 30 is integral with the movable contact 24 by coupling to the corresponding central part 39 or by simple pressurization. The central portion 39 is connected to the movable contact holder 26 by the first spring 42. The second magnetic unit 30 is generally flat and parallel to a plane passing through the longitudinal direction X and the transverse direction Y.

  When the movable contact 24 is in the closed position, the first magnetic unit 28 and the second magnetic unit 30 have a second gap between the two magnetic units 28 and 30 regardless of the degree of wear of the contact disks 38 and 40. Are arranged and dimensioned such that a non-zero gap E2 remains.

  The 1st magnetic part 28 and the 2nd magnetic part 30 are arrange | positioned so that the center part 39 may form the opening part 50 located inside. Thus, an electromagnetic type electromagnetic subassembly is formed together with the movable contact 24.

  When the movable contact 24 is in the closed position and current flows, the first magnetic unit 28 and the second magnetic unit 30 are configured to generate the first force F1. This first force F1 is also called a closing force, and tries to keep the movable contact 24 in the closed position in the vertical direction Z.

  The movable armature 32 is configured to move the movable contact holder 26 between its first and second positions. Accordingly, the control module 18 is configured to cause movement of the movable armature 32 from its first position to its second position. At that time, the control module 18 interrupts the current flowing through the coil 34 based on the information received from the current sensor 16.

  The coil 34 is configured to control the movement of the movable contact holder 26 according to the current flowing therethrough.

  The central portion 39 has a T shape in a vertical plane including the longitudinal direction X corresponding to the cross section III, and both end portions of the horizontal bar of the T shape support both contact disks 40 (FIG. 3). In the vertical plane (cross section IV) including the transverse direction Y, the central portion 39 has a blade shape (FIG. 4).

  When the movable contact 24 is in the closed position, the first spring 42 is configured to exert a force in the vertical direction Z in order to positively pressurize the movable contact 24 against the corresponding fixed contact 22. When the movable contact 24 is in the closed position, the first gap E1 is not zero. Further, when the movable contact 24 is moved to the open position, that is, when the movable armature 32 and the movable contact holder 26 are moved so as to open the movable contact 24, the spring 42 is on the vertical axis Z with respect to the movable contact holder 26. A second force F2 is applied along, thereby accelerating the opening of the movable contact 24.

  3 and 4, the movable contact 24 is in the closed position, and the first gap E1 and the second gap E2 are not zero.

  5 and 6, the movable contact 24 is in the open position, and the first gap E1 and the second gap E2 are substantially zero. The first gap is preferably 0.5 mm to 1.5 mm, and more preferably 0.8 mm. The second gap is preferably 0.1 mm to 1 mm, and more preferably 0.5 mm.

  When the movable contact 24 moves to the open position, it moves along the vertical direction Z, that is, downward, opposite to the corresponding fixed contact 22.

  When the movable contact 24 moves to the closed position, it moves along the vertical direction Z toward the corresponding fixed contact 22, that is, upward.

  When the movable contact 24 is closed, a current flows through the fixed contact 22 and the movable contact 24. The corresponding first magnetic part 28 and second magnetic part 30 generate a first force F1 on the movable contact 24, in particular on its central part 39, so as to maintain the movable contact 24 in the closed position. Let

  When the movable contact 24 is in the closed position, the movable contact 24 abuts on the fixed contact 22, and the first force F <b> 1 generates a third force F <b> 3 that is also called a opening force. The third force F3 attempts to attract the first magnetic unit 28 to the movable contact 24, that is, to attract downward. In a state where the first magnetic unit 28 is overmolded in the contact holder 26, the third force F3 extends to the contact holder 26 and further to the movable armature 32 connected thereto. Thus, the third force F3 is exerted on the movable armature 32 of the actuator 14 in the direction in which the actuator 14 opens, that is, in the direction in which the movable contact 24 opens.

  Further, when the current flows into the movable contact 24, a fourth repulsive force F4 is generated between the movable contact 24 and the corresponding fixed contact 22 in the vertical direction Z, thereby opening the movable contact 24. However, the first force F1 and the pressure exerted on the movable contact 24 allow the movable contact 24 to be maintained in the closed position, and the actuator 14 remains closed due to the holding current flowing through the coil 34. become. The holding current is controlled by the control module 18.

  Next, when the current flowing through the movable contact 24 and measured by the corresponding current sensor 16 becomes excessively high and exceeds a predetermined threshold (eg, short circuit current), the control module 18 detects this as exceeding the threshold. .

  The control module 18 then interrupts the holding current in the coil 34 by applying a control law. Thereby, the holding current of the actuator 14 in the closed position is interrupted, and the force exerted on the movable armature 32 in the opening direction of the movable contact 24, that is, the opening direction of the actuator 14 exceeds the closing force of the actuator 14.

The movable armature 22 thus moves the movable contact holder 26 towards the second position, i.e. downwards, under the following influence.
A second force F2 exerted on each movable armature 32 by each first spring 42;
A third force F3 exerted on the actuator 14 by each first magnetic part 28 in the opening direction, i.e. in the movement direction of the movable contact holder 26 towards the second position;
A fifth force F5 (not shown) exerted in the vertical direction Z and exerted by a second return spring (not shown) of the actuator 14;

  The combination of these three forces F2, F3, F5 allows acceleration of the movement of the armature 22 and hence allows the movement of the movable contact holder 26 towards its second position. This acceleration increases because the first force F1 that generates the third force F3 increases.

  The predetermined threshold is set according to the evaluation of the contactor 10. In general, this threshold is 10 to 20 times the rated current In of the electrical equipment to which the contactor 10 is connected, and preferably about 15 times the rated current In.

  The stroke of opening the armature 32 is much larger than the first gap E1 because it is necessary to ensure the distance to open the movable contact 24 with respect to the fixed contact 22 as well. The movable armature 32 moves downward and drives the movable contact holder 26 downward. As a result, each first gap E1 and each second gap E2 are reduced to substantially zero. Further, each first magnetic unit 28 comes into contact with the corresponding movable contact 24 and moves the movable contact 24 to the open position.

  The movable armature 32 reaches a high speed when passing through the first gap E1. Next, the first magnetic part 28 includes a sub-assembly comprising a corresponding central part 39 and a movable armature 32 moving at a sufficient speed, the movable contact holder 26, the first magnetic part 28, and the movable contact 24. Contact. As a result, the movable contact 24 opens normally, that is, without the risk that the movable contact 24 will later be welded to the corresponding fixed contact 22 and there is no risk of damaging the contactor 10. The movable armature 32 moves until each movable contact 24 is completely opened.

  Since the movable armature 32 is greatly accelerated especially by the first force F1, the first magnetic unit 28 collides with the corresponding movable contact 24 with a large kinetic energy. In this way, the first magnetic part 28 thus opens the movable contact 24 and prevents the movable contact from closing after repulsion as a result of an electrodynamic force corresponding to the fourth force F4. In the case of a borderline that closes after the movable contact 24 is opened by a repulsive force, the opening speed of the armature 32 is such that the movable contact 24 contacts the corresponding fixed contact 22 before colliding with the first portion 28. It means not having time to weld.

  Furthermore, since the current value is different in each phase, that is, in each switching block 12, the contactor 10 has three current sensors 16. The first current sensor 16 out of the three current sensors 16 has a fault current having a value exceeding a predetermined threshold value that causes the holding current of the actuator 14 to be interrupted and the actuator 14 to be released via the control module 18. Is detected.

  FIG. 7 shows four curves C1, C2, C3, and C4. For the contactor 10 including a single switching block 12, the first, second, third and fourth curves C1, C2, C3, C4 each represent a phase. That is, it represents the current flowing through the movable contact 24, the arc voltage between the movable contact 24 and the corresponding fixed contact 22, the movement of the movable contact 24, and the movement of the armature 32. Is a function of time when an electrical defect occurs when opening. The first curve C1 corresponds to the negative current I, and the second curve C2 corresponds to the negative voltage V. The third and fourth curves C3 and C4 correspond to the movement ΔZ along the Z axis, which are expressed as a function of the position of the movable armature 32. The movement ΔZ is considered to be zero when the movable armature 32 is in the closed position, that is, when the holding current flows through the coil. When the movable armature 32 moves and drives the movable contact holder 26 toward the second position, the movement is selected as having a negative value in FIG. 7, as usual, and this movement is downward.

  When the first curve C1 exceeds a predetermined threshold at the time t1 shown in FIG. 7, the movement of the movable armature 32 in the opening direction causes a subsequent interruption of the current flowing through the coil 34 by the control module 18. This movement is controlled according to a control law. Next, the fourth curve C4 starts to decrease from a certain processing time, which corresponds to the movement of the movable armature 32. However, before the movable contact 24 moves, the first gap E1 is not zero and should be passed by the movable armature 32, so that the movable armature 32 and the movable contact 24 via the first magnetic part 28 are passed. The movable armature 32 engages with the movable contact 24.

  The control law includes moving the movable contact holder 26 from the first position to the second position when the current sensor 16 measures a current value exceeding a predetermined threshold value. The control law includes moving the movable armature 32 and moving the movable contact holder 26 when measuring a current value above a predetermined threshold.

  In this way, when a current exceeding a predetermined threshold is generated and the movable contact holder 26 connected to the movable armature 32 is not in contact with the movable contact 24, the current level is predetermined as can be seen from the third curve C3. The movable contact 24 starts to move to the open position as the threshold value is exceeded, and then closes under the influence of the fourth force F4. In this way, a negative non-zero arc voltage occurs between the movable contact 24 and the corresponding fixed contact 22, as can be seen in the curve C2. However, it can be seen that the curve C4 and the curve C3 intersect before the movable contact 24 is completely closed. This means that the movable contact 24 is engaged with the armature 32 and the first magnetic unit 28. Thus, the movable contact 24 is in the open position before it is welded to the corresponding fixed contact 22. The engagement time t2 is shown in FIG.

  When the control law is applied, the first magnetic unit 28 is thus moved toward the open position of the movable contact 24 by the movable contact holder 26 and comes into contact with the movable contact 24.

  Since the time from when the repulsion of the movable contact 24 starts until the first magnetic unit 28 engages with the movable contact 24 is very short, the movable contact 24 cannot be welded to the corresponding fixed contact 22. Next, once the movable contact 24 is at a sufficient distance from the corresponding fixed contact 22, the current returns to zero as shown in the first and second curves C1 and C2, the electric arc disappears, and the arc voltage is reduced. Return to zero. The movable armature 32 continues to move with the movable contact holder 26 until the movable contact 24 is fully opened.

  When the movable armature 32 moves the movable contact holder 26 until the movable contact 24 is fully opened, the movement value ΔZ has a negative value according to the display convention selected with respect to FIG. Become.

  The control method for opening the electrical contactor 10, that is, the movable contact 24 and the actuator 14, when a short-circuit current is detected includes various steps. The first measuring step 100 consists in measuring the value of the current flowing through the movable contact 24 and the corresponding fixed contact 22 using the current sensor 16.

  Next, the second comparison step 102 is to compare the current value with a predetermined threshold value.

  In the third moving step 104, when the current value is larger than a predetermined threshold, the actuator 14, more specifically, the control module 18 cuts off the supply current flowing through the coil 34. Thereby, the movement of the movable armature 32 is controlled for the control law and according to the control law, and the movable contact holder 26 is moved from the first position to the second position via the mechanical connection. During this third step 104, the movable contact holder 26 has a first magnetic part 28 via a mechanical connection so that the first magnetic part 28 abuts the movable contact 24 towards its open position. Move.

  The movable armature 32 continues to move until the movable contact 24 is fully opened, and induces the movement of the first magnetic unit 18.

  During the third step 104, the first magnetic unit exerts a first force F1 that generates a third force F3 in the direction of movement on the movable armature 32 and the movable contact holder 26. Thereby, the movement to the open position of the movable contact 24 is accelerated.

  The first magnetic unit 28 performs two functions. That is, when the current flowing through the fixed contact 22 is smaller than the corresponding predetermined threshold, the function of maintaining the corresponding movable contact 24 in the closed position and the current flowing through the corresponding fixed contact 22 are larger than the predetermined threshold. This function accelerates the opening of the movable contact 24 corresponding to the actuator 14.

  The second magnetic unit 30 can increase the third force F3 exerted on the movable contact holder 26 in the direction of moving from the first position to the second position when the current flowing through the coil 34 is interrupted.

  Alternatively, the predetermined threshold can be set and this value can be adjusted, for example via an encoder system.

  According to another variant, the contactor 10 is a single-phase contactor. In this variation, the contactor 10 includes a single switching block 12. Contactor 10 thus includes a single pair of fixed contacts 22 and a single movable contact 24. The other elements of the contactor 10 according to this embodiment are the same as those described above and will not be described further.

  According to another variant, when the movable contact 24 is in the open position, the single gap between the first gap E1 and the second gap E2 is substantially zero.

  The contactor 10 is configured to be used alone when the short-circuit level is particularly low, and therefore the contactor 10 itself protects the electrical system to which it is connected or when the short-circuit level is high, Configured to be used in combination with a circuit breaker disposed upstream of the.

  When the current sensor 16 measures a current value exceeding a predetermined threshold value, the actuator control law includes that the movable contact holder 26 is moved from the first position to the second position. When a current value larger than the threshold value is measured, the control law includes a control command for moving the movable contact holder 26 from the first position to the second position. At this time, the first magnetic unit 28 is moved by the movable contact holder 26 and comes into contact with the movable contact 24 so as to go to the open position.

Claims (10)

An electrical contactor (10) comprising:
A movable contact (24) movable between a closed position and an open position with respect to at least one pair of fixed contacts (22) and said one or each pair of fixed contacts (22), said fixed contacts (22); ) Are electrically connected to each other via the movable contact (24) when the movable contact (24) is in the closed position, and are electrically connected to each other when the movable contact (24) is in the open position. The fixed contact (22) and the movable contact (24) insulated from each other;
A movable contact holder (26) configured to hold the one or each movable contact (24) by a spring (42), the first position corresponding to the closed position of the movable contact (24); The movable contact holder (26) movable between a second position corresponding to an open position of the movable contact (24);
A first magnetic part (28) that is integral with the movable contact holder and is disposed opposite the one or each movable contact;
An actuator (14) configured to control movement of the movable contact holder (26) between a first position and a second position according to a control law;
A current sensor (16) configured to measure the current flowing through each pair of fixed contacts (22) and each associated movable contact (24);
The control law of the actuator includes moving the movable contact holder (26) from a first position to a second position when a current value greater than a predetermined threshold is measured by the current sensor (16). In this case, the first magnetic part (28) is moved by the movable contact holder (26), and comes into contact with the movable contact (24) so as to go to the open position,
When the current sensor (16) measures a current less than a predetermined threshold and the movable contact (24) is in the closed position, the corresponding first magnetic part (28) is connected to the movable contact (24) and the first contact. 1 gap (E1) is formed,
The movable contact holder (26) maintains the one or each movable contact (24) by a spring (42);
For the one or each movable contact (24), the electrical contactor (10) includes a second magnetic part (30) that is integral with the movable contact (24) and against which the spring (42) abuts,
When each movable contact (24) is in a closed position, the second magnetic part (30) forms a second gap (E2) with the first magnetic part (28). (10). The electrical contactor (10) includes a coil (34) and an electronic control module (18). According to a control law, a current flows through the coil (34), and the coil (34) is connected to the coil (34). 2. The electrical contactor (10) according to claim 1, wherein the electrical contactor is configured to control movement of the movable contact holder (26) as a function of the current flowing through. Electric contact according to claim 1 or 2, characterized in that the current sensor (16) is positioned around one of the fixed contacts (22) with respect to the pair or each pair of fixed contacts (22). Vessel (10) . The electrical contactor (10) according to any one of claims 1 to 3, wherein the one or each first magnetic part (28) is integral with the movable contact holder (26 ) . The electrical contactor (10) according to claim 4, characterized in that the one or each first magnetic part (28) is integral with the movable contact holder (26) by overmolding. When one or more of the movable contacts (24) are in the closed position, the corresponding first magnetic unit (28) and second magnetic unit (30) try to hold the movable contact (24) in the closed position. The electrical contactor (10) according to any of the preceding claims, characterized in that it is configured to apply a closing force (F1) to the corresponding movable contact (24 ) . When one or more of the movable contacts (24) are in the closed position, the corresponding first magnetic part (28) and second magnetic part (30) have the movable contact holder (26) from the first position to the first position. Electrical contact according to any of the preceding claims, characterized in that it is configured to exert a separating force (F3) on the movable contact holder (26) in the direction of movement to two positions. Vessel (10) . A movable contact (24) movable between a closed position and an open position with respect to at least one pair of fixed contacts (22) and said one or each pair of fixed contacts (22), said fixed contacts (22); ) Are electrically interconnected via the movable contact (24) when the movable contact (24) is in the closed position, and electrically isolated from each other when the movable contact (24) is in the open position. A fixed contact (22) and a movable contact (24),
A movable contact holder (26) configured to hold the one or each movable contact (24) by a spring (42), the first position corresponding to the closed position of the movable contact (24); A movable contact holder (26) movable between a second position corresponding to the open position of the movable contact (24);
A first magnetic part (28) that is integral with the movable contact holder and is disposed opposite the one or each movable contact;
An actuator (14) configured to control movement of the movable contact holder (26) between a first position and a second position according to a control law;
A method of controlling an electrical contactor (10) comprising: a current sensor (16) configured to measure current flowing through each pair of fixed contacts (22) and each associated movable contact (24); ,
When the one or each movable contact (24) opens,
-A) measuring the value of the current flowing through each movable contact (24) associated with each pair of fixed contacts (22);
-B) comparing the measured value with a predetermined threshold;
C) controlling the movement of the movable contact holder (26) from the first position to the second position when the measured value exceeds a predetermined threshold, and the first magnetic part (28) is configured to move the movable contact holder Moving by (26) and contacting the movable contact (24) toward an open position,
When the current sensor (16) measures a current less than a predetermined threshold and the movable contact (24) is in the closed position, the corresponding first magnetic part (28) is connected to the movable contact (24) and the first contact. 1 gap (E1) is formed,
The movable contact holder (26) maintains the one or each movable contact (24) by a spring (42);
For the one or each movable contact (24), the electrical contactor (10) includes a second magnetic part (30) that is integral with the movable contact (24) and against which the spring (42) abuts,
The method of claim 1, wherein when each movable contact (24) is in a closed position, the second magnetic part (30) forms a second gap (E2) with the first magnetic part (28).       During step c), the first magnetic part (28) exerts a separating force (F3) on the movable contact holder (26) in the direction of moving from the first position to the second position. 9. A method according to claim 8, characterized in that For the one or each movable contact (24), the electrical contactor (10) includes a second magnetic part (30);
The step (c) is characterized in that the second magnetic part (30) increases the separation force (F3) exerted on the movable contact holder (26) in the moving direction. The method described.

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