Offered in 240, 275, 300 and 320 A options, 8,000 rpm max model 40SI™ features clockwise rotation, 72% efficiency, and 3 mounting options. Model 55SI™, intended for 12–24 V applications, features 80% efficiency and comes in 250/275 A, 24 V and 430 A, 12 V options. Designed for power density and fuel savings, all alternators are brushless and employ remote sense technologies and other features that lend to improved output and fuel efficiency.