---
title: Uninterruptible Power Supply Systems
…298 unchanged lines
label: Design Load Margin
type: select
−unit: %
+unit: '%'
options:
- "10% (well-defined, stable load)"
…49 unchanged lines
label: Maximum Output Voltage THD into Nonlinear Reference Load
type: select
−unit: %
+unit: '%'
options:
- "2% THD"
…12 unchanged lines
label: Steady-State Output Voltage Regulation
type: select
−unit: %
+unit: '%'
options:
- "±1%"
…30 unchanged lines
label: Maximum Input Current THD (THDi) at Full Load
type: select
−unit: %
+unit: '%'
options:
- "3% THDi (active PFC rectifier)"
…212 unchanged lines
label: Minimum Efficiency at Rated Load (Double-Conversion Mode)
type: select
−unit: %
+unit: '%'
options:
- "94%"
…236 unchanged lines
## A maintenance and replacement contract should be considered for mission-critical UPS systems, because the battery is a consumable with a defined service life and the system's value depends on the battery being replaced before it fails an in-service discharge. {note}