Abstract: A thermal relay is provided comprising, in a first cavity of a case, bi-metallic strips through which pass currents of a multi-phase network feeding a load through an electromagnetic contactor and, in a second cavity, an electromagnetic sub-assembly including break and signalling switches whose mobile contacts have pivoting axes and actuating points cooperating with a common piece, the whole forming a deformable parallelogram. The second cavity also contains toggle transmission means between the bi-metallic strips and said common piece as well as means for selecting the mode of operation of the switches. Toggle springs are associated with said mobile contacts.

Abstract: A device for fitting and crimping end pieces on electric conductors includes an end-piece distributor, a holding device for maintaining the end of the conductors in position and a device for transferring the end-pieces from the distributor to the holding device and for positioning the end pieces on the ends of the conductors at the end of such transfer. The transfer device includes a crimping device as well as a closure means, partially closed at rest, which may pass to the open condition under the action of stop devices provided respectively close to the distributor and the holding means so as to make possible access to and/or removal of the end piece.

Abstract: A protective switching apparatus with remote controlled opening and closing is provided including a tripping mechanism connected to an assembly comprising at least two fixed contacts and two mobile contacts and to a magnetic and/or thermal trip; a resetting member and an electromagnet having a movable element and to a member for driving a least one pseudo-fixed or mobile contact. The mobile contacts are carried by a bridge having a plane of symmetry X--X and the tripping mechanism extends in the vicinity of the plane of symmetry X--X. The electromagnet and the trip are housed in the case on each side of the tripping mechanism in a direction perpendicular to the plane of symmetry.

Abstract: A machine is provided for automatically fitting connecting end-pieces to the ends of electric conductors, including a structure movable in translation inside a fixed structure with a first translational movement, and a carriage movable in translation in the mobile structure and able to move in line with an end-piece supply station and a station for guiding and holding the end of the conductors in position. This carriage includes a stripping device, an end-piece reception means and, associated with this reception means, an end-piece crimping device.

Abstract: A device is provided for the indexed fixing of a control unit on a hat shaped section, wherein, at least one auxiliary adjustment device formed of a tenon and a cavity, is disposed between the hat shaped section and the control unit, the mechanical cooperation of the two making it possible to fix the control unit in the longitudinal axis of the hat shaped section.

Abstract: An actuator (26) operates tappets (24, 25) of two switches (21, 22) each controlling one of the directions of operation of the motor. The actuator (26) is guided in a lateral direction (WW') between two active positions in each of which it may then be depressed, causing one of its bosses (55, 56) to actuate the corresponding switch (21 or 22). Flexible lugs (34, 35) return the actuator (26) to an intermediate position in which depression is prevented by a fixed pin (52) cooperating with a projection (51) of the actuator (26). The control box facilitates changing from one direction of operation to the other while avoiding rapid switching, harmful to the motors.

Abstract: Electromechanical protection cutting apparatus comprising a magnetic tripping device and an arc-breaking screen which may be interleaved between at least one fixed contact and one movable contact during an opening caused by the tripping device. The stop (24) associated with the casing (11) of the apparatus to receive the breaking screen (12) is deformable and so arranged as not to restore immediately to the screen the kinetic energy received therefrom.

Abstract: A pole piece (14a) of the movable core (12) moves in an air gap (25a) between external (61) and internal (16) pole pieces. A pole flange (14b) of the same core (12) moves in an air gap (25b) between a portion (30b) of the external pole piece (61) and a magnetic lobe (36) which is in contact with this latter. A permanent return magnet (17) is disposed between the internal (16) and external (61) pole pieces. The magnet (17), the internal pole piece (16) andthe lobe (36) are maintained in a cage (60) of plastic material snap fastened by hooks (78, 80) on the external pole piece (61). Three cross pieces (75, 76, 77) connectingtwo longitudinal walls of the cage to each other, suitably separate the different magnetic components. The force of attraction of the magnet (17) prevents the pole pieces (16, 61) from leaving it.

Abstract: A symmetric percussion switching device is provided using a bistable dead point over-run device including an actuator movable between at least two positions and a control member whose movement causes rocking of the actuator from one to other of the two positions, after passing through the dead point, said device further comprising two switches whose actuating members cooperate with the actuator, respectively in the fractions of the stroke thereof adjacent said positions, said switches then being actuated by percussion so that the drawbacks of the conventional switching devices of this kind are avoided in which the pressure of the mobile contact on the fixed contact is substantially zero in the vicinity of the dead point changeover.

Abstract: A frequency converter is provided for the power supply of an asychronous motor, comprising:a rectifier bridge (11) connected to a multiphase network and to an intermediate DC circuit (12);an inverter (13) comprising three pairs of static switches (T1-T6) connected in a Graetz bridge; characterized by;a means (21) for reading the current associated with the intermediate circuit (12) and elaborating an image signal of the reverse circuit and delivering an image signal of the current in this circuit;a stabilization control circuit (22) connected to said means (21) and delivering a reverse current excess signal (ST) when the signal (I.sub.d) exceeds an adjustable threshold; anda means (25) for reducing the output voltages of the inverter, and adapted for modifying the modulated pulses, this means being controlled by the output signal (ST) of the stabilization control circuit (22).

Abstract: A disconnectable current tapping device is provided having clips engageable on onmibus bars and disengageable therefrom by translation of a clip carrying slide controlled by a rotary shaft, which is rotated by a plug which is mounted for translation on the shaft while being urged by a return spring, and which is subjected to the action of a control member such as an operating key. By an axial thrust exerted on the plug, a transmission piece provided with a spur in engagement in an annular groove formed in the plug, is drawn in translation so as to actuate a prebreak microcontact; at the end of rotation of the shaft controlling the disconnection, the piece is retained by a resilient retractable member, whereas the plug is returned only through a ramp provided at the edge of the groove so as to allow release of the spur.

Abstract: A screw connection device for electric conductors, is provided having at least one screw-clamping piece assembly. A structure integral with the insulating body of the terminal, partially surrounds the screw head and has at least one heel. This heel is applicable against an inclined face of the clamp and is adapted so as to hold the screw-clamp assembly in position against removal along the axis of the screw and against tipping towards the conductor insertion side.

Abstract: A circuit breaking apparatus with remote controlled opening and closing of its circuits is provided in which the supports of the fixed and mobile contacts are adapted so as to develop repulsion forces which produce an excellent limitation of the short circuit currents because no parasite mass is connected to the mobile contact despite the presence of an electromagnet which must actuate it through a pusher or a slide.

Abstract: A device is provided for adjusting the relative position of two parts of the same piece by deforming an intermediate zone connecting these two parts together, by means of a conical screw, and having a tapped bore in which said screw may be screwed, and a cut out which extends from a first edge of the piece to said bore, wherein said intermediate zone further includes at least a second cut out opening into said bore, opposite said first cut out which defines with a second edge of the piece a deformable zone, forming a hinge, offset with respect to said bore.

Abstract: An electric protection apparatus is provided for protection against current faults of different intensities, including, in series in an internal circuit, a first switch with automatic opening, which is controlled by moderate current levels, and a second switch with automatic opening having short circuit current limiting properties; a zinc oxide voltage limiting component, which is placed in parallel across this latter, has a fairly low stabilization threshold so that diverted currents, flowing through it at the time of opening on a short circuit, extend as far as the resistive portion of the characteristic which follows the stabilization level portion.

Abstract: A device for protecting an AC distribution network against short circuit currents and an appropriate current limiting circuit breaker. A downstream circuit breaker (D1) generates a signal (S) for neutralizing the opening of the contacts of an upstream current limiting circuit breaker (D2) when the downstream current exceeds a neutralization threshold less than the tripping threshold and/or than the limitation threshold of (D2). The upstream current limiting circuit breaker (D2) has in parallel a pair of head to tail thyristors (TH1, TH2) and a circuit (16) for controlling the gates of the thyristors, this circuit enabling one of the thyristors in response to the signal (S) for inhibiting (D2) for at most one half wave.

Abstract: A changeover contact-making apparatus with interlocking member and module of protection protected against overcurrents is provided. In a same case, two contact-making systems and coil switches are disposed on each side of a median plane PP' in which the interlocking member is placed. In one of the case inner volumes defined by the plane PP' are placed a single protection module, a tripping mechanism and the respective connection terminals.