In this paper the results of a project funded by Regione Toscana aimed at reducing the power absorption of auxiliary devices in vehicles are presented. In particular the design. testing and application of a magnetorheological clutch (MR) is proposed. aimed at disengaging the vacuum pump. https://www.roneverhart.com/ASUS-R565EA-UH51T-15-6-FHD-1920x1080-Touch-Laptop-Intel-Core-i5-1135G7-2-4GHz-8GB-RAM-256GB-SSD-Windows-10/