Siemens 6SL3120-1TE21-8AA4 SINAMICS S120 18 A Single Motor Module
18 A AA4 booksize module with 54 A peak output and an official D-type migration path.
01Technical Summary
Siemens 6SL3120-1TE21-8AA4 is an internal-air-cooled SINAMICS S120 Single Motor Module with an 18 A rated output and a threefold 54 A peak-current value. The official data sheet lists 15.3 A base-load current, 24 A S6 current, a 9.7 kW type rating at rated current and a 50 mm booksize construction. The AA4 generation is a legacy spare-product stage between the 8AA3 and the current C/D-type modules. Siemens replacement guidance points to 6SL3120-1TE21-8AD0, with motor-connector adaptation required where the existing cable uses the older connection system.
02Specifications
| Manufacturer | Siemens |
|---|---|
| Article Number | 6SL3120-1TE21-8AA4 |
| Product Family | SINAMICS S120 |
| Construction | Booksize, internal air cooling |
| DC Link Voltage | 510 to 720 V DC |
| Electronics Supply | 24 V DC, -15% / +20% |
| Rated / Base-Load Current | 18.0 A / 15.3 A |
| S6 Current at 40% Duty | 24.0 A |
| Peak Current Imax | 54.0 A |
| Type Rating at IN / IH | 9.7 kW / 8.2 kW |
| Rated Pulse Frequency | 4 kHz |
| Motor Cable Length | 70 m shielded; 100 m unshielded |
| Cooling-Air Requirement | 0.008 m³/s |
| Power Loss, Typical / Maximum | 0.14 kW / 0.19 kW |
| Protection | IP20 / UL open type |
| Safety Integrated | SIL 2; PL d; Category 3 |
03Features
Operating Characteristics
- Provides a 54 A peak-current value, three times the 18 A continuous rating.
- Supports a 24 A S6 current for the documented 40 percent duty cycle.
- Includes the motor connector and shield connection arrangement documented for the AA4 generation.
- Supports optimized pulse patterns and extended Safety Integrated functions.
- Integrates with SINAMICS S120 through the included DRIVE-CLiQ cable.
- Maintains the narrow 50 mm booksize format used by the 18 A internal-cooled module class.
Product Identity
- Manufacturer: Siemens
- Model: 6SL3120-1TE21-8AA4
- Product Type: Legacy SINAMICS S120 booksize Single Motor Module
- Status: Spare part / discontinued generation
04Compatibility
- Match the exact 8AA4 hardware and its 54 A peak-current requirement to the machine load profile.
- Confirm 510 to 720 V DC-link operation and the supported 24 V electronics supply.
- Keep shielded motor cable at or below 70 m and unshielded cable at or below 100 m.
- Verify the Control Unit firmware, motor data, feedback, DRIVE-CLiQ topology and Safety Integrated project.
- When migrating to 8AD0, check the changed motor connector and use Siemens adapter guidance where required.
- Provide internal cooling airflow and cabinet protection appropriate for an IP20 / UL open-type unit.
05Replacement
- The AA4 article is a legacy spare-product generation rather than the current design.
- Siemens replacement information points to 6SL3120-1TE21-8AD0 in the D-type range.
- The official adapter guidance maps old 18 A booksize modules to the D-type article using a 2.5 mm² adapter cable where needed.
- Verify power-unit code, connector, cable, firmware and safety behavior before authorizing the exchange.
- After conversion, test peak-current demand, motor braking, thermal behavior, fault response and the complete safety sequence.
06FAQ
Does 6SL3120-1TE21-8AA4 provide threefold overload current?
Yes. The official data sheet specifies 54.0 A peak current for the 18.0 A module.
What motor-cable distances are listed for the AA4 module?
The data sheet lists 70 m shielded and 100 m unshielded as the maximum motor-cable lengths.
What are the documented physical dimensions of 8AA4?
The module is 50 mm wide, 380 mm high and 270 mm deep.
Which present D-type article is identified for migration?
Siemens replacement guidance points to 6SL3120-1TE21-8AD0, subject to connector and application verification.
Why can the AA4 replacement require an adapter cable?
The later C/D-type module uses a different motor-connection system from the old booksize design.
Which thermal values should cabinet planning consider?
The data sheet lists internal air cooling, 0.008 m³/s airflow and 0.14 kW typical / 0.19 kW maximum power loss.
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