75 kW at 400 V — the heavy-lift VFD for pumps and fans
The 6SL3220-3YD42-0UB0: The SINAMICS G120XA is Siemens' variable-frequency drive built for variable-torque loads — pumps, fans, compressors — where the 75 kW rating at 400 V (LO duty) handles the full motor nameplate without derating. Rated current sits at 136 A in LO mode at 400 V, with a max output of 150 A for short-duration overloads. Line voltage tolerance is wide: 380 to 440 V AC +10%/-20%, 3-phase, 47-63 Hz. That covers most global 400 V class grids, including weak networks where voltage sag is a concern.
Output frequency — V/f vs vector control ceilings
V/f control reaches 550 Hz output, suitable for high-speed spindles or centrifugal machines. Vector control tops out at 240 Hz, which is the practical ceiling for closed-loop torque and speed regulation on standard induction motors.
Mature lifecycle — still in production, not end-of-life
Lifecycle stage is listed as mature — meaning Siemens still manufactures it, but it's past the introduction and growth phase. For a BOM freeze or a line-down spare, this is a stable pick; the lead time estimate of 1-10 working days suggests ready availability through distribution.