An electric hand-held tool comprising a separator for removing dust particles from cooling air, wherein - the tool comprises a tri-part housing, having a drive electromotor with a fan located in a part, a reducer part and on the other side a main handle with entry slots for suction of cooling air, characterized in that - the separator is shaped as a cylinder or preferably as a truncated hollow cone with a bottom ring and an upper ring with a surface, preferably cone shaped, having a hub: - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool, so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface, from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle, - that due to such construction larger particles in the cooling air bounce out of the handle, which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator. - the tool comprises a tri-part housing, having a drive electromotor with a fan located in a part, a reducer part and on the other side a main handle with entry slots for suction of cooling air, characterized in that - the separator is shaped as a cylinder or preferably as a truncated hollow cone with a bottom ring and an upper ring with a surface, preferably cone shaped, having a hub: - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool, so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface, from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle, - that due to such construction larger particles in the cooling air bounce out of the handle, which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator. - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool, so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface, from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle, - that due to such construction larger particles in the cooling air bounce out of the handle, which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator.