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UPS PDP55 On-line double conversion 100% Sinusoidal from 3500 ~ 10000 VA The UPS PDP55 is available in the convertible version Tower - Rack with power from 5500 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.