Abstract: An electric distribution board serves for the distribution of two phases, or of two phases and an earth and has a back member which receives, according to choice, two mounts which are each appropriate to the respective method of current distribution, these mounts comprising selector means which only permit couplings with compatible current connector plugs.

Abstract: An a-c current sensor for measuring the current which flows in a conductor has an insulating frame having a central compartment open at its upper end and encompassed by a U-shaped receptacle for a bent portion of the conductor. A coil is housed in the central compartment. The frame is slidingly mounted within a sleeve made of a soft magnetic material and having two assembled half-shells. The voltage generated by the current across the coil is proportional to the intensity of current flow.

Abstract: A contactor apparatus is provided comprising automatic opening means and a local control member.This apparatus uses a transmission piece (40) associated with a sudden tripping mechanism (46) which is released by a bolt (29) held in position by means of a lever (24) which may be struck by a magnetizable part and adapted to maintain a power contact (13) open, this part assuming, after the appearance of a fault, visible positions so as to inform the user about the state of the apparatus.This apparatus is usable in installations where it is desired to protect the lines and the loads.

Abstract: A threshold coupling device for releasing the mobile contacts of circuit breakers when short circuits appear. A rectangular section blade (13) with longitudinal faces (13', 13") associated with a contact holder (10) is provided with balls (29, 30) which cooperate with a resilient clip (33) for providing a threshold mechanical connection between the contact (6) and an operating member (1, 2) which carries this clip. This coupling is advantageously used in circuit-breaker limiters.

Abstract: The keyboard comprises a printed circuit (4) serving both as an electrical connection means and as a supporting means for a modular frame (3) including a plurality of square-shaped housings (30) defined by walls (31) and arranged in rows and columns, either contact modules (7) or signal-lamp modules fitted on said printed circuit in said housings, a resilient, sealed diaphragm (1) secured to said frame, keys cooperating with said contact modules through the portions of said keys which face outwardly from said diaphragm and are actuated by an operator finger, and means (105, FIG. 5; 9, FIG. 2) by which a tactile feel can be provided through a snapping, movement.

Abstract: A system is provided using a multiplicity of coupled modules (43) each module comprising a removable electro-magnetic valve (53) provided with terminals (73, 74) and a base (52) having coupling members (106, 107) which cooperate with the terminals, and connecting pieces (104, 123) for supplying the coil (55). This system is applicable in particular in industrial installations where electrical detectors control pneumatic apparatus.

Abstract: A mechanically controlled power switch with automatic opening is provided for limiting short circuits. A switch (13), a breaking chamber (30) which is associated therewith, a coil (50), a striker (51) cooperating therewith, and a lock (53) for holding the power switch in open position S after the appearance of a short circuit are placed in a removable cartridge (23) provided with connection terminals (37, 55). This switch cartridge is advantageously used in mechanically controlled protection apparatus or in electromagnetic contactor apparatus having their own protection.

Abstract: A device is provided comprising a simple means for holding the contacts apart and insulated from each other after circuit breaking.A screen formed by an insulating plate of small thickness, is placed between two mobile contact levers and is urged by springs against flanges which are integral with the levers and which move apart when short circuit currents appear for allowing this screen to be rapidly projected between the contact inserts.This simple circuit-breaker device may be used such as it is or in association with a contactor for protecting lines which supply consumer apparatus.

Abstract: The movable contact (52) of an on-off switch is moved, through drive means (5), by balls (4) rotated by a disc (23) in the peripheral surface of which regularly spaced cavities are provided to accomodate the balls. The balls can be either withdrawn or inserted through a channel or bore (20) which can be closed by a plug (7) so that the switching pattern can be varied depending upon the angular position of the disc. The device can be used e.g. in a selector switch or a program control apparatus.

Abstract: An electrical apparatus which can be dismantled and is adapted to be fitted onto a fixed standard-shaped rail or section.The apparatus comprises a prism-shaped casing (50) having a rectangular opening (60) into which is accommodated a removable bottom (5) on the sides of which are provided means (25, 27) for fastening it to said casing and outer hooks (19, 20) adapted to cooperate with said shaped rail (2).Such an apparatus is particularly advantageous when its dimensions approximate the transverse dimensions of the rail or section, as it is the case when a small-size contactor or a relay is to be fitted into the casing.

Abstract: At least one coil partly surrounds a magnetic circuit consisting of a fixed yoke and a movable armature, the armature being constituted by a permanent magnet having pole faces adapted to carry pole-pieces which project on each side of the axis of magnetization. The electromagnet comprises a second permanent magnet interposed within the fixed yoke with a polarity such that the armature is urged towards the end or so-called rest position when the coil is not energized.

Abstract: A DC/AC converter consisting of bridge-connected transistors or thyristors and bridge-connected recovery diodes, wherein the center points of the diode bridge are connected with the corresponding center points of the transistor or thyristor bridge, including a switching aid inductor (L.sub.1, L.sub.2, 17, 18) in each half-bridge, to which is connected one terminal of a storage capacitor (C.sub.1, C.sub.3, 21, 22) the other terminal of which is connected to the input of a respective energy recovery circuit (RE.sub.1, RE.sub.2, 23, 24) the outputs of which are connected to the supply terminals of the DC/AC converter.

Abstract: Transistor switching means in which a principal transistor (T.sub.5) feeds into a load (R.sub.c) when a control signal saturates a control transistor (T.sub.1), a resistance bridge (R.sub.3,R.sub.4) fed by a source (V.sub.AL) then polarizing the base of the principal transistor (T.sub.5).An auxiliary transistor (T.sub.3 a) has its base coupled to the collector of the transistor (T.sub.5) by means of a diode (D.sub.2 a) and one of the two polarization resistances (R.sub.10 -R.sub.11). When the collector-emitter voltage of the principal transistor becomes too strong as a result of a short-circuit in the load, the auxiliary transistor (T.sub.3 a) is saturated and blocks the principal transistor (T.sub.5).Application to detectors of the type having an electro-luminescent diode excited by pulses; these pulses, applied to the auxiliary transistor (T.sub.3 a) block it momentarily in order to ensure the re-setting of the circuit when the overload has disappeared.

Abstract: In order to simulate an instantaneous temperature-rise of a thyristor through which flows a current (I), this device takes the mean value (VM) of that current and squares the effective value (EC) thereof. An image of the dissipated power obtained at the output of an adder (S) is applied to devices (K.tau.ra, K.tau.br, K.tau.jb) for simulating radiator-environment, housing-radiator and junction-housing thermal time-constants, respectively. An adder (S.sub.1) provides the image i (.DELTA..theta.) of the temperature-rise.

Abstract: A device determines the mean power absorbed from a current supply by measuring the current in a phase, and the voltage between two phases, determining the product thereof, and integrating the product.A first potentiometer provides a proportion of the voltage which is an image of the current, and subtracts it from that voltage between phases. A second potentiometer provides a proportion of the voltage between phases and subtracts if from the product. A third potentiometer provides a proportion of a constant voltage and subtracts it from that product. The third potentiometer is adjusted so that the output power of the integrator shall be zero when the motor rotates under no-load condition.

Abstract: A detector apparatus of the two-terminal type supplied with rectified A.C. power (e.sub.1, e.sub.2, v.sub.1 v.sub.2, D.sub.7 -D.sub.10) the voltage of which can vary in a wide range, for controlling a series-connected load (CH), including at least one thyristor (TH.sub.1) and a Zener diode (Z.sub.3), a detector-control circuit assembly (CAP) associated with the load, the output (s) of which biases the base of a first transistor (T.sub.1), a capacitor (C.sub.5) serving as a power supply for the detector control circuit (CAP), and means for protection against overloads, which include a MOS-type transistor (T.sub.3), a second transistor (T.sub.2) connected to the grid of said MOS transistor, and a differential amplifier (A) connected in series with the base of said first transistor (T.sub.1).

Abstract: A switch provides for cutting the pressure feed for distributors placed downstream of it, and for coupling the feed of these distributors to an exhaust of the switch itself, and has faces for connection with faces of the distributors, channels for circulation of exhaust fluid, members for connection with adjacent distributors, and is adapted for mounting on a conventional profiled element. The switch is particularly advantageous for ensuring the control of the feed of one or of several jacks coupled to distributors.

Abstract: A progressive pneumatic starter device delivers at its outlet an increasing pressure of low flow rate, then a working pressure at a high flow rate. The starter device is provided with a distributor member adapted to connect, in parallel with a calibrated bore, a channel of large section, when a pressure which is greater than a predetermined threshold and which is not derived from the outlet is applied to the distributor member. The starter device is advantageously placed upstream of a pneumatic switch to which it is directly associated for the purpose of shortening its channels for transfer of fluid.

Abstract: A connecting device is for pneumatic apparatus intended particularly to control the distribution of fliuds passing to receptor apparatus. The body (1) of each apparatus can be coupled to that of an identical or analogous apparatus, placed upstream or downstream, by orientatable screws (45) placed in housings opening in the region of faces (5,6) coming into contact during association (25,26). This device is applicable to all apparatus intended to constitute a group of identical apparatuses, and is applied advantageously to the construction of an assembly for the control of jacks.

Abstract: A protection device has first and second differential transformers each with a toroidal magnetic core through which pass the neutral and phase conductors of an alternating current distribution network, and a secondary winding. The secondary winding of the first transformer is coupled to the input of an amplifier followed by a rectifier, a threshold comparator and a control device adapted to release a circuit-breaker. The secondary winding of the second transformer is coupled to the output of the amplifier. The improvement is constituted by an auxiliary amplifier inserted between the output of the first amplifier and the terminals of the secondary winding of the second differential transformer.