The row-based Liebert APM is a transformer-free, on-line uninterruptible power supply (UPS) that allows quick and easy capacity increases with modular scalability–with no additional floor space required. Liebert APM operates with high efficiency–up to 94% at loads of 50-100%. The 208 Volt, three-phase Liebert APM is available in two models, expandable with modular power scalability: Liebert APM 45kVA/kW frame size is expandable from 15 to 45kVA/kW, with up to 45kVA/kW of capacity, or up to 30kVA/kW of capacity with a 15kVA/kW module for redundancy. This frame size includes internal batteries, and is compatible with the matching external battery cabinet and the optional Liebert APM bypass distribution cabinet (BDC). Liebert APM 90kVA/kW frame size is expandable from 15 to 90kVA/kW, with up to 90kVA/kW of capacity, or up to 75kVA/kW of capacity with a 15kVA/kW module for redundancy. This frame size requires the matching external battery cabinet, and is compatible with the optional Liebert APM BDC bypass distribution cabinet.