Tender For supply of 20 kva ups system with battery for mrpl project : : - 20 kva 110 v 50 hz ac ups system with ni cd battery battery charger acdb all accessories for 30 min backup time , sapre power thyristors transistors igbt igct , spare control cards , spare power supply cards , spare power fuses , spare control fuses mcb , spare indicating lamps , spare indicating lamps covers , spare blocker diode