Abstract: A two-way switching circuit for connecting a supply power to a load comprises two electronic switches connected to each other. Each of the two electronic switches includes two electronic switch units connected to each other. Each of the two electronic switches has a control circuit including a common actuator selectively connected to both of the electronic switch units thereof for alternately turning on the respective electronic switch units. A first of the electronic switch unit of each of the two electronic switches is connected to each other and a second of the electronic switch units of each of the electronic switches is connected to each other, whereby switching circuit is thus adapted to connect a power supply to a load when both of the first electronic switch units or both of the second electronic switches are on.

Abstract: An accessory of any kind, for example an end-cap, is designed to be fitted to the base of trunking. To make the retention of the end-cap to the trunking more firm, at least one thickness-increasing device is fitted to its base, before the end-cap, and forms a localized increased thickness on the base. Applications include moldings.

Abstract: An auxiliary switch for a circuit-breaker includes a casing containing at least one contact blade member mobile under the control of a pivoting and sliding actuator lever between a closed position and an open position. The actuator lever has a lateral actuator pin which projects out of the casing through a slot in the latter. The slot has a localized escape lobe away from its main part and which receives the actuator pin.

Abstract: A support system for devices, in particular electrical devices, to be attached transversely to a trunking body between two longitudinal walls of the latter comprises two crossmembers each engaged with one of the longitudinal walls at each end and each equipped with fixing arrangements for local fastening of the device. These fixing arrangements are mounted on the crossmember so that their position can be adjusted along its length.

Abstract: A cleaning device includes a barrier having (1) a central axis, (2) a first barrier segment extending from the central axis, (3) a second barrier segment extending from the central axis, and (4) a third barrier segment extending from the central axis. The cleaning device also includes a first cleaning layer having a first layer front side and a first layer back side, the first layer back side being attached directly to the first barrier segment and the second barrier segment. The cleaning device further includes a second cleaning layer having a second layer front side and a second layer back side, the second layer back side being attached directly to the second barrier segment and the third barrier segment. In addition, the cleaning device includes a third cleaning layer having a third layer front side and a third layer back side, the third layer back side being attached directly to the first barrier segment. The cleaning device also includes a cleaning agent impregnated within the first cleaning layer.

Abstract: A two-wire power supply switch connected in series with a load between two poles of an alternating current mains electrical power supply conventionally includes a main triac between two terminals of the switch which is turned on by the conduction of an optotriac with a time-delay relative to the zero crossing of the voltage between the switch terminals determined by the breakdown voltage of a series of Zener diodes. The switch includes a power supply unit with a rectifier bridge connected to one terminal directly and connected to the other terminal via a capacitor. An auxiliary triac shunting the capacitor is turned on by the optotriac on each zero crossing of the voltage between the switch terminals. This optimizes conditions when the switch is open and when the switch is closed separately.

Abstract: The signal delivered by a Doppler sensor is treated after amplification, filtering and digitization by: means for determining the global energy of the digitized signal; autocorrelation test means for showing up a dominant frequency; a filter for rejecting that frequency; comparators for eliminating signals having energy less than a threshold; a filter for isolating a particular frequency band; and means for intercorrelation with a reference signal held in memory.

Abstract: A switch mechanism has a conductive mobile contact carrier with two lateral branches pivotally engaged with a central hub. The lateral branches of the conductive mobile contact carrier are continuous with its middle branch, each being joined to the latter by a large radius elbow, and the conductive mobile contact carrier bears on the output contacts through its lateral branches. The output contacts are near the central hub so that the lateral branches of the conductive mobile contact carrier are subjected to a local transverse self-cleaning movement when it comes into contact with the output contact. Applications include single-throw and double-throw switches.

Abstract: A marker device includes a plate receiving an identifying message and at least one pair of arms facing each other and adapted to attach the device to a support. Each arm includes in the gap between them a finger extending towards the plate. Over at least the width of the finger in the direction parallel to the lengthwise direction of the plate, the arms each lie alongside a respective opening in the plate providing access to the finger. One application of the device is to marking electrical conductors and/or electrical devices such as terminal blocks, for example, provided with an appropriate support.

Abstract: A marker device includes a support adapted to receive an identifying message and at least one fixing member integral with this support for attaching the combination to an item to be marked. Two marker devices are detachably paired enabling conjoint composition of the identifying messages they are two carry. The device is applicable to identifying both ends of the same electrical installation cable.

Abstract: A solid-state switch is connected in series with a load between the poles of an electrical power supply. It includes an isolated gate bipolar transistor with an emitter connected to the internal ground and connected to the load and a collector connected to one pole of the supply and driving an input of a subtractor the other input of which is connected to receive a set point voltage. The output of the subtractor drives a feedback system connected to the gate of the transistor. The voltage at the gate is then representative of the current in the switch and is applied to interrupter means which sends a turn-off signal if the gate voltage exceeds a (triggering) threshold value. The turn-off signal sends to a switching circuit a turn-off voltage which produces a turn-off bias and disables the feedback circuit.

Abstract: Trunking, in particular trunking for electrical apparatus, includes a body with inwardly directed lips and a cover adapted to be snap-fastened to the lips. The trunking further includes a cover jointing member extending transversely between the lips of the body to cover the end of the cover. At one end at least it is provided with a latch for locking it to the respective lip of the body.

Abstract: A device for butt-joining two sections of perforated cable tray includes a fishplate having on each side of a central area a latch member adapted to slide in a longitudinal slot with hoops adapted to cooperate with a line of perforations and to be locked therein by means of a comb member.

Abstract: Having the general form of an extrusion, a trunking accessory has a blade for attaching it to the trunking and a bead adapted to project from the trunking. The accessory can be used with trunking employed to house and protect electrical equipment.

Abstract: A trunking or like type multipart assembly of structural sections comprises a base and a cover snap-fastened to the base by two flanges. The flanges of the cover are elastically deformable and the assembly further comprises an independent over-cover which has two flanges by which it is snap-fastened to the cover. The assembly of structural sections is usable as trunking, baseboards, architectural moldings and the like.

Abstract: An equipment support can be attached to the body of trunking having two inwardly facing lips. The support has on each edge of each of two mutually orthogonal pairs of opposite edges of unequal length a groove which can be engaged on these lips.

Abstract: A low voltage dimmer is shown with the dimming function being on a primary side of a low voltage transformer. Live voltage feeds through a triac to the primary side of the transformer with the gate for the triac being controlled by a microprocessor. To prevent burnout of the transformer if the secondary load side is open, zero crossing of the incoming signal is determined by the microprocessor. If the time constant between the zero crossing of the live voltage and the charging of a capacitor with resistance being provided by the primary side of the transformer exceeds w predetermined time period, the microprocessor will be inhibited from generating a pulse to fire the triac. When the primary side of the transformer has been opened, the load on the secondary side can be re-established, i.e. light bulb replaced. Power for the microprocessor is from the charging of a capacitor used to provide the triggering signal to the microprocessor. Also the microprocessor may be triggered from remote locations.

Abstract: A stick of separable marker devices comprise support and a plurality of marker devices in a row detachably carried by the support. The support is made from a synthetic material. The marker devices that it carries are in one piece with it.

Abstract: A dimmer with reduced filtering losses is connected into a conductor supplying power to a load from a mains power supply. It conventionally comprises a triac in series with a filter inductor between an input terminal and an output terminal and a circuit generating triggering signals for the triac. To reduce the losses in the inductor, which conventionally is in series with the load at all times but is active only during moments following triggering of the triac, to reduce the amplitude of the transient currents, a second triac triggered by a circuit with a time-delay greater than the time constant defined by the filter capacitor and inductor diverts the load current. An auxiliary low-value inductor attenuates transients due to triggering of the second triac.