YDC3300 series UPS compliant with UL/CSA standards is aviable now! Equipped with three-level inverter topology, it results in high energy-saving and reliability. With higher power density, smaller footprint, it takes the leading position in the UPS industry with same power capacity; Adopting unique power unit redundancy design technology, decrease the abnormity risk of system after single-point failure, greatly increase the system reliability. For user, it is your best choice with high investment rate.