If we talk about commonly used electrical apparatus, then UPS (Uninterruptible Power Supply also commonly known as Uninterruptible Power Source) may hit somewhere around the top of the list. Vacker Nigeria supplies a variety of models of UPS that come in different sizes and various power capacities in cities such as Lagos, Abuja, Kaduna, Port Harcourt, Aba, Ibadan and Kano. These devices are also known as flywheel backup. They provide emergency power backup to the electrical devices that are connected to it. The power backup thus provided is uninterruptible in nature which means that the connected electrical device will not have a pause or break in operation and can perform operation in a non-discrete manner. Because of this nature this apparatus is called uninterruptible power supply.