SINAMICS S120 Single Motor Module, 30 A — Spare-Part Fit
The Siemens 6SL3121-1TE23-0AA3 is a SINAMICS S120 Single Motor Module designated as a spare part, meaning it is intended for replacement of an existing unit in a running drive system, not for new line builds. It accepts a 600 V DC input from the common DC bus and delivers a 400 V 3 AC output rated at 30 A, sized for a motor load in that current class. The booksize form factor with external air cooling fits into the standard S120 booksize cabinet layout, sharing the DC bus with other modules. The integrated DRIVE-CLiQ cable connects directly to the Control Unit for communication and parameter download. Optimized pulse patterns and extended Safety Integrated functions are supported on this module — relevant for applications requiring safe torque off (STO) or safe brake control without an external safety relay. Confirm the specific Safety Integrated functions needed against the Control Unit firmware version.
Lifecycle & Sourcing Reality
The datasheet carries a revision date of 24.06.2021, with the standard Siemens copyright and change-rights clause. No PCN or EOL notice has been published for this module as of that revision.
What the Key Ratings Mean for Fit
The 30 A output rating at 400 V 3 AC governs the motor current the module can handle — not the motor nameplate power. For a standard 400 V induction motor, 30 A corresponds roughly to a 15–18.5 kW motor, but always verify against the motor's full-load current (FLC). The module is rated for continuous duty at that current with external air cooling; derating applies if the ambient temperature exceeds 40 °C or if the cooling airflow is restricted. The 600 V DC input comes from the S120 DC-link bus, which is typically fed by a Smart Line Module or Active Line Module. This module cannot be powered directly from AC mains — it requires a pre-existing DC bus. Verify the DC bus voltage rating of the existing line module; the 600 V DC nominal is standard for a 400 V AC system. Booksize construction means the module mounts side-by-side with other booksize units on a common mounting rail, sharing the DC busbar and the DRIVE-CLiQ daisy chain. External air cooling requires clearance above and below the module for airflow; do not block the heatsink fins.