This manual contains information about S120 Booksize Power Units, including system overview, line connection and line-side power components, line modules Booksize, line modules Booksize Compact, motor modules Booksize, motor modules Booksize Compact, DC link components, braking resistors, motor-side power components, accessories, cabinet design and EMC Booksize, cooling circuit and coolant properties, service and support Booksize and Appendix A.