UPS or Uninterruptible Power Supply is one significant constituent of the power protection systems. UPS is essentially a device, which has battery packs and the DC current is produced through it. This DC current is instead converted to the AC current, which is used to run your appliances.These UPS are kind of boxes where the batteries are put. These batteries are then attached to the appliances. The batteries are charged while there is supply of current. During the cut out phase the batteries get discharged. DC current is produced, which later converts to AC current. It is this AC current which runs the appliances. Detailed explanation of the UPS power protection systems The UPS are of two main types as offline mode and online mode. The offline mode is used for smaller purposes. You can use these UPS in your homes. Under this scheme the UPS needs to be manually turned on. You can connect all your appliances through it. The connection is not in direct circuit. So, when the current gets cut off the UPS does not turn on by itself. There is a second mode of UPS. It is called online mode of UPS. This UPS is mostly used in offices. Generally it is of heavy duty. Those offices that can’t afford power cut even for a fraction of second go for it. And, in today’s scenario you can count upon all the offices round the globe. The online UPS is generally put in the main circuit. While the power is present the battery gets charged.