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500kVA rated UPS systems for medium to large datacentres and other types of critical environments. The UPS are rated at 500kVA or higher. Units with a Unity power factor are shown as a kW-rating. Monoblock UPS can be operated in a parallel/redundant N+X configuration to provide additional resilience. Modular UPS systems can be extended to the full capacity of their frames of supplied with modules arranged to achieve N+X scalability or redundancy. Battery sets are supplied in external battery cabinets or racks for a range of runtimes and can be configured using sealed lead acid maintenance free or lithium-ion batteries. Transformerless UPS will have high operating efficiencies and transformer-based systems will be suitable for industrial UPS applications. Customisation and bespoke options are available for harsh environments. Static transfer switches for and centralised bypass arrangements are available.