TRIO DC UPS Phoenix Contact TRIO DC UPS is an uninterruptible power supply that takes up minimal space and has a 24VDC output rating. This UPS ensures that DC power for electrical loads continues to be supplied in the event of power interruptions. If power is interrupted, the UPS switches to battery operation without interruption so that connected loads continue to be continuously supplied. When the power reconnects, the UPS automatically returns to normal operation. Phoenix Contact TRIO DC UPS is ideal for supplying industrial PCs (IPCs), PLCs, and other controllers.