<p>The clutch (1) has an actuator device (4) provided for a disk set (2). The actuator device has a fluid pressure source (5) e.g. air pressure source and hydraulic pressure source, which stands in fluid connection with a piston device (6). The piston device has a set of pistons (7-9) arranged in assigned piston chambers (10-12) and connected with each other. The pistons and the piston chambers are arranged in assigned housing parts (14-16), which are connected with each other. The piston device is provided with an actuating part (13) brought in effective connection with the disk set.</p>
