Addition or replacement of FlexPower cores can be accomplished without powering down connected equipment. The Liebert APM 45 or 90kW model (60 Hz frequency) is available in North America and South America.
https://www.youtube.com/watch?v=jMoywsVawKg
Liebert APM UPS: Exceptionally Efficient, Row-Based, On-Line UPS
The Liebert APM is a transformer-free, on-line UPS that allows quick power capacity increases with the addition of internal FlexPower™ core hardware assemblies. The FlexPower core assemblies allow the system to expand for capacity or redundancy in 15 kW increments up to 45 or 90kW within a single cabinet.