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UPS PDX220 On-line double conversion 100% Sinusoidal 1000 ~ 3000 VA The UPS PDX220, is available in the convertible version Tower - Rack with power from 2200 VA with on-line double conversion (VFI): The load is powered by the inverter, which supplies a filtered and stabilized sinusoidal voltage, voltage , shape and frequency, in addition, the input and output filters considerably increase the immunity of the load against mains power disturbances and lightning strikes