A coarse separator (10) for a power tool (2) is used for separating, at least partially, from an air flow (L), material particles (M) produced during operation of the power tool (2) and aspirated by a suction device (8), and includes an inlet opening (48) connectable with the suction head (6) of a suction device (8) that aspirates the particles, an outlet opening (40) for letting a purified air flow (L) out, and a lamella separator arranged between the inlet opening (48) and the outlet opening (40).