Off Line Uninterrupted Power Supplies ( UPS) systems, including Line Interactive types are frequently preferred over Online types for small office or data center applications, justified on the basis of lower procuring and running costs, in spite of relatively poorer protection. This approach disregards existing differences between Online UPS systems, such as the ability, of certain online systems to operate in Economic (Eco) mode, which may offer better power protection at lower cost.This is a p...