Frequency Converter FC-101P37KT4P20H3XXCXXXSXXXXAXBXCXXXXDXVLT® HVAC Drive FC- 101(P37K) 37 KW / 50 HP, Three phase 380 - 480 VAC, IP20 / Chassis Backplate(H3) RFI Class A1/B (C1) No Brake chopper No Loc. Cont. Panel Coated PCB, No Mains Option No A Option, No B option No C1 option, No D optionFra