Efficiencies range from 79% for the 5V output model to 91% for the 48V output. The advanced design of the DRB series has a very low off-load power draw of <0.3 Watts, which is key for many “green” building automation systems. The robust casing is made from a flame retardant polycarbonate plastic and 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 DRB models carry a three year warranty.