Abstract: A permission device for an electric safety lock, particularly for inhibiting access to high-voltage areas, comprising high-voltage resistive elements, which receive in input the voltage of the area and are adapted to produce a voltage drop, a capacitive element being connected in series to the resistive element and being adapted to be charged by the resistive element, at least one control diode of an optical fiber being arranged so as to receive the discharge of the capacitive element, an oscillator being adapted to drive at least one indicator LED, the optical fiber sending a signal giving or denying permission to release the lock.

Abstract: Electrical contact with double-knife coupling, particularly for disconnectors, switches or the like comprising: two knives, which face each other and can move toward or away from each other; a spacer, which delimits the maximum mutual approach of the knives; elastic elements, which contrast elastically the mutual spacing of the knives; and a main contact pin; the knives can move together to pass from an active position, in which they engage the main contact pin with their mutually facing faces, to an inactive position, in which they are disengaged from the main contact pin, or viceversa; elements for indicating the degree of wear of the region of contact of the knives with the main contact pin are provided which allow to detect when the degree of wear is greater than a maximum acceptable value and requires maintenance.

Abstract: A device for actuating shoe brakes, particularly for rail or tram vehicles, comprising elements for actuating at least one brake shoe of a rail or tram vehicle, powered by battery voltage and powered by a bank of supercapacitors arranged in parallel to the actuation elements, the bank of supercapacitors being controlled and charged by a dedicated circuit, which is connected to the battery, insulation elements being provided in order to insulate the actuation elements from the battery when the actuation elements are powered by the discharge of the bank of supercapacitors.