It is a system used to maintain power supply to devices in the event of a power outage. It typically consists of batteries that store electrical energy and an inverter that converts the stored energy in the batteries into suitable electrical power for the devices being operated.

UPS systems are used in various applications, such as computers and sensitive electronic devices, communication facilities and power stations, hospitals and medical laboratories. UPS systems require regular maintenance to ensure optimal performance and proper operation in the event of a power outage. This includes checking and replacing batteries as needed, regularly testing the system to ensure proper functioning, and performing routine maintenance on transformers and other devices that constitute a vital part of the system.