Eaton 3P900UI UPS Standby Offline 0.9 kVA 540 W 4 AC outlets

The Eaton 3P900UI UPS is a standby (offline) tower uninterruptible power supply offering 0.9 kVA / 540 W output and four AC outlets for connecting computers, network equipment and other sensitive electronics. Designed for small office or home use, the unit includes USB ports for monitoring or charging, a 12 V battery with 9 Ah capacity and a compact black enclosure that fits standard workspace layouts. The Eaton 3P900UI meets CB, CE and RoHS certification requirements and provides basic battery backup and surge protection to maintain device operation during short power interruptions.

Advantages

The Eaton 3P900UI delivers a clear balance of compact size and backup capability with a straightforward standby topology. It supplies 540 W of output power across four AC outlets, enabling simultaneous protection of multiple devices. Integrated USB ports allow easy connection to a host for monitoring or for powering small peripherals. With a 9 Ah, 12 V battery the UPS provides reliable short-duration runtime while its certified safety listings support compliant installation in homes and light commercial environments.

Suitable for

• Desktop PCs and workstations
• Home office equipment and peripherals
• Network devices such as routers and modems
• Point-of-sale terminals and small cash registers

Key specifications

• Output power capacity: 0.9 kVA
• Output power: 540 W
• AC outlets: 4
• USB ports: 2 (USB 2.0)
• Battery: 12 V, 9 Ah
• Form factor: Tower
• Colour: Black
• Weight: 3.9 kg

How to use

Place the Eaton 3P900UI on a flat, stable surface with adequate ventilation and connect critical loads to the AC outlets. Plug the UPS into a grounded mains outlet and allow the internal battery to charge for several hours before relying on battery backup. Use the USB ports where supported to connect to a computer for basic monitoring or to charge peripherals. During a mains failure the unit will switch to battery power automatically; observe the UPS indicators to monitor battery status and load conditions. Replace the internal battery according to the manufacturer’s maintenance schedule or when runtime degrades.

Recommendations

For reliable operation, avoid connecting high inrush or non-supported equipment to the UPS and keep the total connected load below 540 W. Regularly verify battery condition and perform periodic functional checks to ensure the UPS provides expected backup time during outages.