Abstract: Luminous signalling device (1) includes one or more light tubes (8) and focusing elements (2, 3, 4, 5, 6, 7) for focusing a light beam, these elements being capable of focusing a light beam coming from the light tube(s), the elements for focusing a light beam comprising several cylindrical lenses (2, 3, 4, 5, 6, 7), each cylindrical lens having a longitudinal axis lying parallel to a straight section (9, 10, 11) of the light tube. The straight sections (9, 10, 11) are oriented in several directions around a predetermined azimuthal axis (A), the number and the orientation of the straight sections being chosen so that the light beams coming from the straight sections and focused by the cylindrical lenses (2, 3, 4, 5, 6, 7) are directed in all azimuthal directions about the azimuthal axis.

Abstract: Luminous signalling device (1) comprising one or more light tubes (8) and focusing means (2, 3, 4, 5, 6, 7) for focusing a light beam, these means being capable of focusing a light beam coming from said light tube(s), said means for focusing a light beam comprising several cylindrical lenses (2, 3, 4, 5, 6, 7), each cylindrical lens having a longitudinal axis lying parallel to a straight section (9, 10, 11) of said light tube, characterized in that said straight sections (9, 10, 11) are oriented in several directions around a predetermined azimuthal axis (A), the number and the orientation of said straight sections being chosen so that the light beams coming from said straight sections and focused by said cylindrical lenses (2, 3, 4, 5, 6, 7) are directed in all azimuthal directions about said azimuthal axis.

Abstract: The device includes two detectors of overvoltage (8, 9) each connected between a respective one of a pair of power line conductors (1, 2) and a respective input of an arrester (7). The outputs of the detectors are connected to an OR-gate (10) the output signal of which is applied to a threshold gate (12). The output of gate (12) is connected to a first monostable trigger (13) having a first time constant and controlling, through a latch gate (14), a bipolar insulating device (3, 4) isolating the load (90) from the power network. In order to achieve the automatic reconnection of the load after each perturbance, the output of the latch gate (14) is also connected to a second monostable trigger (16) having a second time constant higher than the first, and to the clock input of a counter (15) having its return-to-zero terminal connected at the output of the second monostable trigger. Preferably, an integrator (11) is connected between the OR-gate (10) and the threshold gate ( 12).

Abstract: An automatic domestic power line breaker comprising a current-to-voltage converter to which is applied an input signal obtained from the secondary of a differential transformer coupled to the power line. The converter output is coupled through a low pass filter to a rectifier, the output of which is connected to a function generator, which provides an output signal comprising a voltage having a slope proportional to the peak amplitude of the rectifier output signal. The function generator output is applied to a first input of a comparator having a second input to which is applied a d.c. threshold voltage. The comparator output signal is applied through an amplifier to control the state of a set of normally open relay contacts series connected in the power line conductors. A feed-back diode shunts the first input and output of the comparator to lock the relay contacts in the open state if the breaker has controlled opening of the contacts.

Abstract: A surge voltage arrester assembly includes a threaded tubular housing member coupled to circuit ground and including therein an axially aligned compression spring, metallic cage with extending resilient fingers, a solder pellet, a gas-filled tube having a primary arc gap and insulator means with secondary arc gap holes separating a pair of electrically conductive members contacting the gas-filled tube and metallic cage respectively.