The TRIO-UPS-2G uninterruptible power supply [UPS] with integrated power supply unit is used to ensure that secure DC power for critical electrical loads continues to be supplied in the event of disturbances in the power supply network, e.g. due to mains breakdown or failure. In the event of such a disturbance, the UPS switches to battery operation without interruption so that connected loads continue to be continuously supplied. In this operating mode, the output voltage is directly dependent on the battery voltage. When mains power is restored, the UPS automatically returns to normal operation. The connected loads are again supplied via the power supply network and the battery is charged at the same time. The TRIO-UPS-2G uninterruptible power supply [UPS] is designed specifically for supplying industrial PCs [IPCs].