The Siemens 6SL3120-2TE21-0AA3 is a SINAMICS S120 Double Motor Module designated as a spare part, meaning it is the exact replacement unit for an existing drive cabinet. It takes a 600 V DC bus input and delivers two independent 400 V three-phase AC outputs rated 9 A each.
Lifecycle stage is marked mature, which means Siemens considers this a stable, long-available design with no active phase-out notice. The datasheet carries a revision date of 11.01.2021, confirming the documentation is current. For a maintenance-spares purchaser, this is the part to hold as a critical spare for any S120 booksize cabinet running dual 9 A axes — one in the cabinet, one on the shelf, before it fails.
Booksize construction clips onto the standard SINAMICS S120 booksize backplane rail. Internal air cooling eliminates the need for an external fan tray in most enclosures.
Optimized pulse patterns reduce motor audible noise and bearing currents, a practical benefit on long cable runs to the motor. Extended Safety Integrated functions (STO, SS1, SBC) are supported without an external safety relay, simplifying the safety circuit for a guarding zone or hazard area. The module is a direct swap for an existing failed unit — no parameter changes needed if the motor data and drive configuration are already stored in the Control Unit.