Schneider Electric ATV630D37N4 37kW-50HP VS DriveSpecifications :Range of product : Altivar Process ATV600 Degree of protection : UL type 1 conforming to UL 508C Type of cooling : Forced convection Supply frequency : 50...60 Hz - 5...5 % [Us] rated supply voltage : 380...480 V - 15...10 % Speed drive output frequency : 0.1…500 Hz Nominal switching frequency : 4 kHz Safety function : STO (safe torque off) SIL 3 Discrete input logic : 16 preset speeds