Abstract: The invention concerns a device for protection against transitory overvoltages, comprising: a varistor; a discharge tube; a thermofusible soldering securing a first electrode of the discharge tube and a first electrode of the varistor, the thermofusible soldering being a conductor of electricity and being able to melt beyond a temperature threshold when the varistor or the discharge tube heats up; the second electrode of the varistor being designed to be connected to a first electrical line and the second electrode of the discharge tube being designed to be connected to a second electrical line; a restoring element exerting a restoring force tending to move the first electrode of the varistor away from the first electrode of the discharge tube in order to allow a separation between the first electrode of the varistor and the first electrode of the discharge tube during a melting of the thermofusible soldering.

Abstract: The invention concerns a device for protection against transitory overvoltages, comprising: a varistor; a discharge tube; a thermofusible soldering securing a first electrode of the discharge tube and a first electrode of the varistor, the thermofusible soldering being a conductor of electricity and being able to melt beyond a temperature threshold when the varistor or the discharge tube heats up; the second electrode of the varistor being designed to be connected to a first electrical line and the second electrode of the discharge tube being designed to be connected to a second electrical line; a restoring element exerting a restoring force tending to move the first electrode of the varistor away from the first electrode of the discharge tube in order to allow a separation between the first electrode of the varistor and the first electrode of the discharge tube during a melting of the thermofusible soldering.

Abstract: A limiting circuit breaker comprises two separable contacts 68, 70 and a mechanism 12 with energy storage 36 operated by an opening catch 30. The mechanism 12 drives a movable cage 58 between a closed position and an open position to perform opening of the contacts. One of the contacts is movable with respect to the cage 58 in the closed position and can thus take a separated position. A Thomson effect electromechanical actuator 100 is provided to drive the movable contact 68 to the separated position. A latch 80 enables the movable contact to be held in the separated position. In the event of a fault requiring a very high-speed response, separation of the contacts is obtained by means of the Thomson effect actuator and is then confirmed by opening of the mechanism. In other cases, only the mechanism operates to perform opening.

Abstract: A limiting circuit breaker comprises two separable contacts 68, 70 and a mechanism 12 with energy storage 36 operated by an opening catch 30. The mechanism 12 drives a movable cage 58 between a closed position and an open position to perform opening of the contacts. One of the contacts is movable with respect to the cage 58 in the closed position and can thus take a separated position. A Thomson effect electromechanical actuator 100 is provided to drive the movable contact 68 to the separated position. A latch 80 enables the movable contact to be held in the separated position. In the event of a fault requiring a very high-speed response, separation of the contacts is obtained by means of the Thomson effect actuator and is then confirmed by opening of the mechanism. In other cases, only the mechanism operates to perform opening.

Abstract: An electrical switchgear apparatus comprises a fixed frame, a circuit breaker movable in the fixed frame between a plugged-out position and a plugged-in position, a reversible plug-in and plug-out mechanism of the circuit breaker, a movable means for detecting an indexed position of the mechanism or of the circuit breaker, linked to a first electrical switch, and a movable means for detecting an indexed position (open or closed) of the main contact means of the circuit breaker linked to a second electrical switch. Each of the two switches comprises an input, a first output and a switching means able to take a first position in which it connects the input of the switch electrically to the first output of the switch, the switching means being kinematically linked to the corresponding detecting means, in such a way that the switching means is in its first position if and only if the corresponding detecting means is in its active position.

Abstract: An electrical switchgear apparatus comprises a plug-in circuit breaker movable in a fixed frame by means of a drive mechanism. A movable element, secured to the circuit breaker or to the drive mechanism, takes indexed positions characteristic of the plugged-out, test or plugged-in state of the apparatus. The apparatus is provided with at least two indicating switches. Indexing means enable each of the switches to be connected to the movable element in such a way that the first switch switches when the movable element reaches a first indexing position and that the second switch switches when the movable element reaches a second indexing position. The same indexing means, placed in a second state, also enable each of the switches to be connected to the movable element in such a way that the first switch switches when the movable element reaches the second indexing position and that the second switch switches when the movable element reaches the first indexing position.