Power problems a UPS protects against

Mains power is rarely perfect. A UPS guards equipment against a handful of recurring problems.

Blackout

A total loss of power. The UPS switches to battery so the load keeps running or shuts down cleanly.

Sag and swell

Voltage dips and rises that stress power supplies. Automatic voltage regulation corrects them without using the battery.

Surge and spike

Short, high-voltage events from switching or lightning. A UPS clamps them before they reach the load.

Noise and frequency

Electrical noise and frequency drift can upset sensitive gear. An online UPS rebuilds a clean, stable waveform through double conversion.

Which topology you need depends on the load — see online vs line-interactive.