An Uninterruptible Power Supply or Uninterruptible Power Source (UPS) is an electrical system that, when the input power source or main power fails, provides emergency power to load. Most UPS have a relatively short on-battery lifetime (only a few minutes), yet enough to start a standby power source or shut down the safety equipment properly. This is essential and handy for the new normal as it serves as a back-up power supply for our devices to continue working.