Peripheral ModelRedundancy Module 40A:DRDN40Buffer Module:DBUF20 / DBUF40DIN-Rail:ICL-16R / ICL-28RLinear Shape:ICL-16L / ICL-28LRedundancy Module 20A:DRDN20UPS :DR-UPS40 / DUPS20 / DUPS40 Wattage : NAFeatures :20A redundant module20A/40A DIN Rail Buffer Module20A/40A DC UPS moduleAC Inrush Current Limiter