The Siemens 6SL3121-2TE13-0AA4 is a SINAMICS S120 Double Motor Module — a booksize-format drive unit that takes a 600 V DC bus input and delivers 400 V three-phase AC output at 3 A per channel, for two independent motors. It includes external air cooling, optimized pulse patterns, and extended Safety Integrated functions, plus the DRIVE-CLiQ cable. This is a spare part, not a current-production catalog item; the design is frozen, and the datasheet carries a 28.04.2021 revision mark.
The 600 V DC input matches the standard SINAMICS S120 DC-link bus — common in multi-axis systems where a line-side module provides the DC bus. The 400 V three-phase AC output at 3 A per channel is sized for small servo or induction motors. The booksize format with external air cooling mounts in a cabinet with forced ventilation. Extended Safety Integrated functions are supported.