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Systems & Data Center · Foundational

Uninterruptible Power Supply (UPS)

A device that provides immediate battery-backed power during utility outages and conditions power for connected equipment.

Definition

Topologies include standby (offline), line-interactive and double-conversion (online), which provides the best isolation from power anomalies and is standard in data centers. UPS runtime bridges until generators start or allows graceful shutdown.

Example

A double-conversion UPS carries the load for 10 minutes until generators come online.

Exam tip

Online double-conversion UPS has zero transfer time and is preferred for critical loads.

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