The Siemens 6SL3120-1TE21-8AA3 is a SINAMICS S120 Single Motor Module designated as a spare part, meaning it is intended for replacement in existing S120 drives rather than new system builds. It accepts a 600 V DC input and delivers 400 V three-phase AC output at 18 A, in the booksize form factor with internal air cooling. The module supports optimized pulse patterns and includes extended Safety Integrated functions, with a DRIVE-CLiQ cable for communication. The 18 A rating governs motor current for a single axis — sized for a 3-phase induction motor in that current class, typical for small conveyors, spindle drives, or feed axes in machine tools.
Integration Notes
The booksize format mounts in the SINAMICS S120 cabinet lineup. Internal air cooling draws cooling air through the module — verify clearance above and below for the airflow path. The 600 V DC input comes from the S120 DC link, fed by the line module. The 400 V three-phase output at 18 A drives a single motor; the extended Safety Integrated functions (STO, SS1, SBC) are enabled via the control unit and require a safety-rated controller or F-CPU. Optimized pulse patterns reduce motor losses and audible noise at low speeds — relevant for precision feed axes.