The Eaton 9E 10000i is a double-conversion online uninterruptible power supply, the most reliable UPS topology available, which continuously converts incoming AC power to DC and back to clean AC — so connected equipment always runs off the UPS's own regulated output with zero transfer time during a power failure or load shedding event. At this capacity tier, it's designed for protecting server rooms, network racks, and other critical business infrastructure rather than single desktop PCs. Online UPS units like this one also provide strong protection against voltage sags, surges, and frequency variation, which is especially valuable in South Africa given frequent grid instability.