Operating conditions Ambient temperature:- 15℃<0<40℃ Rated Voltage: 220/380V 380/660V Rated: Frequency: 50Hz Insulation Class: B, F Duty: S1 (continuous) Altitude: not exceed 1000m Protection class: IP44, IP54 Cooling method: ICO141 connection: Star-connection for up to 3KW, delta-connection for 4KW and above