The Keysight N3300A is a full-rack width mainframe with 6-slots that accepts combinations of N330x user-installable load modules (150 W to 600 W) for easy system configuration and future reconfiguration. The N3300A holds up to six N3302A, N3303A, N3304A, and N3307A load modules, or up to three N3305A and N3306A load modules, allowing up to 1,800 watts of total maximum power.