APC Smart UPS 3 kva protects your data by supplying network grade battery backup when power fails. It safeguards your equipment against damaging surges and spikes that travel along utility and data lines. APC Smart UPS is the perfect UPS for fileservers, minicomputers, UNIX CPUs, Internet hubs, telecommunications systems and other mission critical applications. The Smart-UPS also features automatic voltage regulation (AVR), which instantly adjusts high and low voltages to safe levels, so you can work indefinitely during brownouts and overvoltages. SmartSlot internal accessory slot allows you to install optional accessories to enhance the performance of your UPS. With a resettable circuit breaker, you get easy recovery from overloads; no need to replace a fuse.