Integrated assembly for the motorized operation of a roll-up shutter, comprising a tubular shaft with horizontal axis, wherein the roll-up shutter is externally fixed and rolled, and wherein a geared motor, an arresting device and a set of compensating springs, which are disposed between said geared motor and said arresting device, are housed; wherein said tubular shaft is supported by two bottoms (21 and 22) suitable for being fixed to the wall by means of brackets, and wherein one of said bottoms acts as support also for said geared motor, the rotor of said geared motor being joined to the tubular shaft by means of screws; characterized in that said set of compensating springs comprises an opposite pair of circular flanges (41 and 42), namely a first flange and a second flange, and a torsion spring is mounted in intermediate position, the ending turns of said torsion spring being joined to the circular flanges (41, 42), and wherein: - the flanges (41 and 42) are inserted in a same shaft housed in the center of the tubular shaft and joined to said first flange by means of a pin; - the first flange disposed at the end of the spring directed towards the geared motor revolves with said tubular shaft, it being fixed by means of screws; - the second flange is fixed, it being indirectly connected to said bottom, in such a way that said second flange remains stationary until said shaft rotates with the other first flange and the tubular shaft: wherein said arresting device comprises: - a stator consisting in a ring provided with a set of regularly spaced niches on its internal edge; - a rotor consisting in a disc disposed in central position inside said stator and integrally revolving with said tubular shaft; said rotor comprising a hub and an external cylindrical wall provided with a set of counter-niches that are regularly spaced and house cylindrical rollers; said shaft passing through the second flange and the hub of the rotor, it being fixed by means of a radial pin. wherein said tubular shaft is supported by two bottoms (21 and 22) suitable for being fixed to the wall by means of brackets, and wherein one of said bottoms acts as support also for said geared motor, the rotor of said geared motor being joined to the tubular shaft by means of screws; characterized in that said set of compensating springs comprises an opposite pair of circular flanges (41 and 42), namely a first flange and a second flange, and a torsion spring is mounted in intermediate position, the ending turns of said torsion spring being joined to the circular flanges (41, 42), and wherein: - the flanges (41 and 42) are inserted in a same shaft housed in the center of the tubular shaft and joined to said first flange by means of a pin; - the first flange disposed at the end of the spring directed towards the geared motor revolves with said tubular shaft, it being fixed by means of screws; - the second flange is fixed, it being indirectly connected to said bottom, in such a way that said second flange remains stationary until said shaft rotates with the other first flange and the tubular shaft: wherein said arresting device comprises: - a stator consisting in a ring provided with a set of regularly spaced niches on its internal edge; - a rotor consisting in a disc disposed in central position inside said stator and integrally revolving with said tubular shaft; said rotor comprising a hub and an external cylindrical wall provided with a set of counter-niches that are regularly spaced and house cylindrical rollers; said shaft passing through the second flange and the hub of the rotor, it being fixed by means of a radial pin. - the flanges (41 and 42) are inserted in a same shaft housed in the center of the tubular shaft and joined to said first flange by means of a pin; - the first flange disposed at the end of the spring directed towards the geared motor revolves with said tubular shaft, it being fixed by means of screws; - the second flange is fixed, it being indirectly connected to said bottom, in such a way that said second flange remains stationary until said shaft rotates with the other first flange and the tubular shaft: wherein said arresting device comprises: - a stator consisting in a ring provided with a set of regularly spaced niches on its internal edge; - a rotor consisting in a disc disposed in central position inside said stator and integrally revolving with said tubular shaft; said rotor comprising a hub and an external cylindrical wall provided with a set of counter-niches that are regularly spaced and house cylindrical rollers; said shaft passing through the second flange and the hub of the rotor, it being fixed by means of a radial pin. - a stator consisting in a ring provided with a set of regularly spaced niches on its internal edge; - a rotor consisting in a disc disposed in central position inside said stator and integrally revolving with said tubular shaft; said rotor comprising a hub and an external cylindrical wall provided with a set of counter-niches that are regularly spaced and house cylindrical rollers;