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An Uninterruptible Power Supply, also Uninterruptible Power Source or by the acronym UPS, is an electrical apparatus that provides emergency power to a load when there is a power outage. Unlike an auxiliary power system, such as a generator, the UPS will provide instant power during a failure for a seamless failover. The UPS supplies power from batteries and therefore is limited in duration, allowing time for equipment to be properly shut down reducing load, or time for an auxiliary power system to kick in. The primary role of any UPS is to provide short-term power when the input power source fails. However, most UPS units are also capable in varying degrees of correcting common utility power problems. The UPS can serve as a form of surge protection, depending on the unit design. Other correcting capabilities of some UPS units include protection against brown out variations, harmonics and other forms of line noise, and frequency variances.[[File:ups-ill01.gif]]For these applications, selecting a line-interactive or stand-by operation UPS such as Tripp Lite models in the Omnismart, VS series, or BC Pro line will fulfill the afore mentioned requirements more than adequately. For these applications, selecting a line-interactive or stand-by operation UPS such as Tripp Lite models in the Omnismart, VS series, or BC Pro line will fulfill the afore mentioned requirements more than adequately.