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10 4200FA Installation and Operation Manual
The UPS protects the connected load against the normal, everyday problems associated with heavy use
of raw commercial power, including power sags, surges, signal interference, and spikes.
In addition, the models with transformers provide total isolation to reduce the common and normal mode
noises. This adds further protection to keep power-line problems from reaching your load, where it can
cause equipment to operate erratically, or damage hardware and software.