Efficiencies range from 91% for the 120W model to 94% for the 240 and 480W models. The advanced design of the DRF series has a low off-load power draw of <0.5W for the 120 and 240W models and <0.75W for the 480W model, which is key for many “green” building automation systems. The robust metal casing has been rigorously tested for shock and vibration while mounted onto the rail. The average efficiency is compliant with the Energy-related Products (ErP) Directive for Europe. All DRF models carry a five-year warranty.