The published range

DSP Flexipower — a compact range for small and medium loads

DSP Multipower — for medium installations

Pyramid DSP and Pyramid DSP-T — larger three-phase installations

Forte series — high-capacity installations

Modular UPS — where capacity growth and module-level serviceability are required

Matching a family to a load

Single-phase or three-phase supply and load

The present load in kW and kVA, and the growth expected

The backup time required, which sets the battery arrangement

Whether redundancy is required, and whether it must be maintained during service

Online topology

These are double-conversion designs: the load runs from the inverter continuously, so it does not see the mains disturbance at all. That is what distinguishes them from an offline unit, which transfers when the supply fails.