An uninterruptible power supply (UPS) is an electrical system that supplies emergency electricity when the power supply or the mains power fails. Online and offline UPS system are two vital types of UPS and both supply power to the system.
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An uninterruptible power supply (UPS) usually performs two prime roles in the electrical grid. From one end, it is constantly feeding the electric power without any interruption while on the other side, it prevents the electrical devices from numerous variation in AC power.
Differences between the online and offline UPS system
Online UPS:
Offline UPS: