Siemens 6SL3120-2TE21-8AA3 Double Motor Module
An internally air-cooled 18 A/18 A two-axis SINAMICS S120 power module identified by the exact AA3 hardware suffix.
Product Profile
Siemens 6SL3120-2TE21-8AA3 is a SINAMICS S120 Double Motor Module for two 18 A motor outputs. The booksize power section accepts the 600 V DC nominal link and supplies 400 V three-phase motor outputs, with internal air cooling, optimized pulse patterns, extended Safety Integrated support and the supplied DRIVE-CLiQ cable identified in the official product description. Siemens classifies the AA3 article as a spare-part generation. It must remain distinct from the later 8AC0 C-type and 8AD0 D-type modules even though all three share an 18 A/18 A headline rating.
Technical Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6SL3120-2TE21-8AA3 |
| Product Family | SINAMICS S120 |
| Product Type | Booksize Double Motor Module |
| Cooling | Internal air cooling |
| Nominal DC Input | 600 V DC |
| Motor Output | 400 V, 3-phase AC |
| Rated Output Current | 18 A / 18 A |
| Axis Count | 2 motor outputs |
| Pulse Pattern | Optimized pulse patterns |
| Safety Functions | Supports extended Safety Integrated functions in the approved system |
| Communication | DRIVE-CLiQ cable included |
| Hardware Identifier | AA3 generation |
| Lifecycle Position | Spare-part generation |
System Role
Drive-System Functions
- Feeds two independently controlled motor axes from one S120 power module.
- Connects to the modular 600 V DC nominal link.
- Provides 18 A rated output current on each motor side.
- Uses internal air cooling in booksize construction.
- Supports DRIVE-CLiQ identification and diagnostic communication.
- Participates in extended Safety Integrated functions when engineered in a validated S120 system.
Exact Product Identity
- Manufacturer: Siemens
- Model: 6SL3120-2TE21-8AA3
- Product Type: SINAMICS S120 booksize Double Motor Module
- Status: Spare-part generation
Compatibility
- Use the complete 6SL3120-2TE21-8AA3 article for a like-for-like spare evaluation.
- Do not copy C-type 8AC0 or D-type 8AD0 mechanical and generation data into an AA3 record.
- Verify Control Unit firmware, DRIVE-CLiQ topology, motor data and encoder configuration.
- Check DC-link, 24 V electronics supply, connectors, cabinet airflow and protective devices.
- Revalidate the Safety Integrated project and both axes after any hardware exchange.
Applications
- Legacy two-axis SINAMICS S120 booksize drive groups using the AA3 generation.
- Machine service where one module powers two 18 A motor axes.
- Spare-part planning based on the exact installed hardware suffix.
- CNC and motion systems retaining the original internal-air-cooling arrangement.
- Controlled replacement followed by separate commissioning of both motor outputs.
FAQ
Why must the AA3 suffix be retained for 6SL3120-2TE21-8AA3?
It identifies the installed hardware generation; 8AC0 and 8AD0 are later C-type and D-type designs with different product data.
How many motor outputs does this AA3 module provide?
It is a Double Motor Module with two 18 A outputs.
Which cooling method belongs to 6SL3120-2TE21-8AA3?
The official description specifies internal air cooling.
Is a DRIVE-CLiQ cable part of the identified product description?
Yes. Siemens lists the DRIVE-CLiQ cable with this module.
Can the 8AD0 data sheet be used as the technical sheet for AA3?
No. Use generation-specific documentation and do not transfer D-type mechanical or overload data.
What should be tested after an AA3 module exchange?
Verify DRIVE-CLiQ recognition, both motor channels, current limits, feedback, diagnostics and the Safety Integrated acceptance sequence.
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