235*100*41 mm (9.3" *3.9" *1.6") Model TotalPower Input type PFC DesignGuide Full range Fixed 220V SS-400H1U Active PFC 80+ 400W V Active (PF =99%) EPS1U v2.0 Safety EMI/EMC CB CUL UL CCC DEMKO FIMKO NEMKO SEMKO TUV VDE PSE BSMI CE FCC C-tick V V V V V V V V (V = certificate ready ; P = certificate pending; V * = not apply to all models) 80 PLUS power supplies make better use of energy, so they run cooler and more reliably. 80 PLUS power supplies are 20% more efficient than standard supplies – they are 80% efficient at 20%, 50% and 100% utilization.