Siemens 6SL3120-2TE21-8AA0 SINAMICS S120 18 A Double Motor Module
First-generation 18 A/18 A Double Motor Module uses a 100 mm housing and the original twofold peak profile.
Product Profile
Siemens 6SL3120-2TE21-8AA0 is the first-generation SINAMICS S120 Double Motor Module for two 18 A motor axes. The original equipment manual specifies 2 x 24 A intermittent-duty current, 2 x 36 A peak current, a 705 µF DC-link capacitance and a 6.8 kg module weight. Unlike the current 9 A 2TE21-0AD0, the 8AA0 suffix denotes an 18 A module in a wider 100 mm booksize housing. It must also remain distinct from later 18 A D-type modules that provide a threefold 2 x 54 A maximum.
Technical Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6SL3120-2TE21-8AA0 |
| Product Family | SINAMICS S120 |
| Construction | First-generation booksize, internal fan |
| DC Link / Electronics Supply | 510 to 750 V DC / 24 V DC |
| Output Voltage | 0 to 480 V AC rms |
| Rated Output Current | 2 x 18.0 A |
| Intermittent-Duty Current | 2 x 24.0 A |
| Peak Current | 2 x 36.0 A |
| Rated Power | 2 x 9.7 kW |
| Pulse Frequency without Derating | 4 kHz |
| DC-Link Capacitance | 705 µF |
| DC-Link / 24 V Busbar Capacity | 100 A / 20 A |
| Cooling-Air Requirement | 56 m³/h |
| Protection / Dimensions | IP20; 100 x 380 x 270 mm |
System Role
Power-Section Functions
- Feeds two 18 A motor axes from one early-generation power section.
- Provides the original AA0 2 x 36 A peak-current value.
- Supports 2 x 24 A for the documented intermittent-duty condition.
- Uses a 100 mm housing with 705 µF DC-link capacitance.
- Requires 56 m³/h internal cooling airflow.
- Includes separate motor channels, brake interfaces and DRIVE-CLiQ connections.
Exact Product Identity
- Manufacturer: Siemens
- Model: 6SL3120-2TE21-8AA0
- Product Type: First-generation SINAMICS S120 booksize Double Motor Module
- Status: Legacy spare article
Compatibility
- The embedded 8 in 2TE21-8AA0 identifies the 18 A class; 2TE21-0AD0 is only 9 A.
- Do not apply the later 18 A D-type 2 x 54 A maximum-current value to this AA0 module.
- Preserve the original connector, brake, fan and DRIVE-CLiQ arrangement during exact replacement.
- Check the 100 mm mechanical position and adjacent DC-link covers before redesign.
- Validate firmware support and both motor-channel current limits for any replacement generation.
- Complete motor, brake, diagnostic and safety acceptance tests before returning the machine to service.
Applications
- Exact spare service in legacy machines using the 18 A 8AA0 power section.
- Two-axis systems whose original parameters use the 2 x 36 A peak limit.
- Cabinets engineered for the 100 mm housing, 6.8 kg weight and 56 m³/h airflow.
- Legacy production machinery retaining first-generation S120 connectors and busbars.
- Migration studies comparing the original 18 A AA0 generation with current D-type or S220 modules.
FAQ
What does the 8AA0 suffix indicate in this model family?
For this exact article it identifies the legacy 18 A/18 A Double Motor Module, not the 9 A class.
Which peak current is documented for 6SL3120-2TE21-8AA0?
The original Siemens equipment manual specifies 2 x 36 A.
How wide is the legacy 18 A module?
It uses a 100 mm booksize housing.
What cooling-air requirement applies?
The documented requirement is 56 m³/h.
What is the original module weight?
Siemens specifies 6.8 kg.
Can later 18 A D-type peak data be used for 8AA0?
No. Later D-type modules have a different threefold peak profile; the AA0 limit is 2 x 36 A.
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