Travaini TRMB40-150M3PHA DRIVE NOT INCLUDED (NEEDED). EVOLUTION variable. Speed variation drive. Direct three-phase (without coupling between shaft and pump. ; Modulation and variation of vacuum is preprogrammed. This can decrease up to 40% of CFM as the freezing point approaches. Used with the Bilomatic, start and stop is automatically done according to the indicated temperature. It consumes 25% less electricity : Three-phase 11 AMP and 32 Amps at full speed compared to a single phase which is 43 AMP. Those high efficiency Travaini pumps can get up to 28 HG of vacuum. Those models are cooled with water or oil (cooling system not included - see Kits for the full package)