SINAMICS S120 Single Motor Module, 18 A — Spare-Part Fit
The Siemens 6SL3121-1TE21-8AA4 is a spare-part SINAMICS S120 Single Motor Module in booksize format, fed from a 600 V DC link and delivering 400 V three-phase AC at 18 A to the motor. External air cooling handles the thermal load; the module supports optimized pulse patterns and the extended Safety Integrated functions, and ships with the DRIVE-CLiQ cable included.
The 600 V DC input ties directly to a SINAMICS S120 Smart Line Module or Active Line Module DC bus — no additional DC supply needed. The 18 A output at 400 V three-phase matches a roughly 7.5 kW induction motor on a pump or conveyor. Booksie construction means it slides into the common S120 booksize chassis alongside other modules, sharing the backplane cooling and DRIVE-CLiQ ring. External air cooling requires clearance above and below the module for airflow; derate if the cabinet ambient exceeds 40 °C.