... frequency,online double conversion,IGBT 2.N+X redundant,Hot-swap,green UPS 3.high reliablity,availability,efficiency SICON-EMI Power ... , 20KVA MODULAR STRUCTUREThe UPS system is real modular structure. Each power module functions as a unique UPS uniteRedundant updateable system: N ... the users. And the maintenances of the UPS is very easy, just with the power module changed. pure sine wave online UPS