When it comes to safeguarding any delicate electronic and electrical equipment or DATA from power fluctuations and outages, ON-LINE UPS are the most popular option worldwide. Charger, batteries, and inverter make up its three main parts. On-line UPS, also referred to as twofold conversion UPS, converts raw utility AC power into clean DC power before converting it back into AC to supply the load with uninterrupted and clean power. It has a battery as a backup power source. The UPS immediately changes to BATTERY mode in the event of a mains supply breakdown or fluctuations that exceed certain predetermined thresholds. The UPS returns to mains mode and begins charging the batteries as the utility supply returns to normal.