The Siemens 6SL3130-7TE21-6AA0 is a SINAMICS S120 Active Line Module — the regulated DC-bus supply for a multi-axis servo drive system. It takes 380-480 V three-phase AC at 50/60 Hz and outputs a regulated 600 V DC rail at 27 A, good for 16 kW of connected motor load. Internal air cooling keeps the cabinet fan count down. The package includes the Control Voltage Adapter and a DRIVE-CLiQ cable, so you're not hunting for those separately on a line-down replacement. This is a spare part, not a first-fit production unit — the description flags it explicitly. That means it's the same hardware as the original build, but if you're specifying a new cabinet, check whether the current production revision carries a different order code.
The 16 kW output at 600 V DC is the real selection number — it tells you how much total motor power the DC bus can support. If your axis load sums to 18 kW, this module undershoots; step up to the next frame. The 27 A output current is the DC-side rating, not the AC input draw; input current will be higher by the ratio of input to output voltage, less efficiency losses. Internal air cooling means it pulls cabinet air through its own heatsink — make sure your enclosure has enough airflow and that the module isn't sandwiched between heat-producing drives. The 380-480 V AC input range covers 400 V and 480 V nominal grids worldwide, 50 or 60 Hz. No derating needed between the two frequencies for this class of active front end.