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Siemens 6SL3120-1TE21-8AA3 SINAMICS S120 18 A Single Motor Module

Siemens 6SL3120-1TE21-8AA3 SINAMICS S120 18 A Single Motor Module

Item NO.: 3749104
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Detail

  • Product NameSiemens 6SL3120-1TE21-8AA3 SINAMICS S120 18 A Single Motor Module
  • Item NO.3749104
  • Weight1.0000 kg = 2.2046 lb = 35.2740 oz
  • CategoryPLC
  • BrandSiemens
  • Creation Time2026-08-27
  • Legacy SINAMICS S120 booksize Single Motor Module
Siemens 6SL3120-1TE21-8AA3 SINAMICS S120 18 A Single Motor Module
SINAMICS S120 | Single Motor Module

Siemens 6SL3120-1TE21-8AA3 SINAMICS S120 18 A Single Motor Module

Legacy 18 A booksize module with 36 A peak output and 6SL3120-1TE21-8AA4 successor path.

ManufacturerSiemensModel6SL3120-1TE21-8AA3Product TypeLegacy SINAMICS S120 booksize Single Motor Module

01Technical Summary

Siemens 6SL3120-1TE21-8AA3 is an internal-air-cooled SINAMICS S120 booksize Single Motor Module rated at 18 A. Siemens catalog data for the AA3 generation specifies 15.3 A base-load current, 24 A S6 current at 40 percent duty and 36 A maximum current. This twofold peak-current characteristic is an important distinction from the later 8AA4 and 8AD0 variants, which are documented at 54 A. The product is now handled as a legacy spare, and its exact hardware generation, power-unit code and motor connection should be retained during maintenance planning.

Article VerificationMatch the complete article number, hardware generation, current profile, connections, firmware and installed drive project before ordering.

02Specifications

Manufacturer Siemens
Article Number 6SL3120-1TE21-8AA3
Product Family SINAMICS S120
Construction Booksize, internal air cooling
DC Link Voltage 510 to 720 V DC
Rated Output Current 18 A
Base-Load Current IH 15.3 A
S6 Current at 40% Duty 24 A
Maximum Current Imax 36 A
Type Rating at IN / IH 9.7 kW / 8.2 kW
Rated Pulse Frequency 4 kHz
DC-Link Current 22 A
DC-Link Capacitance 220 µF
Cooling-Air Requirement 0.008 m³/s
Lifecycle Position Legacy spare-part generation
Immediate Successor 6SL3120-1TE21-8AA4

03Features

Operating Characteristics

  • Supplies one 18 A motor axis from the shared SINAMICS S120 DC link.
  • Provides a documented 36 A maximum-current capability for the AA3 generation.
  • Supports 24 A intermittent current under the specified S6 40 percent duty.
  • Uses optimized pulse patterns and supports the extended Safety Integrated functions stated in the product description.
  • Includes DRIVE-CLiQ connectivity for the modular control architecture.
  • Preserves a defined hardware generation used in existing machine-tool and automation drive systems.

Product Identity

  • Manufacturer: Siemens
  • Model: 6SL3120-1TE21-8AA3
  • Product Type: Legacy SINAMICS S120 booksize Single Motor Module
  • Status: Spare part / phased-out generation

04Compatibility

  • Match the exact 8AA3 suffix and the installed power-unit code; an 18 A rating alone is insufficient.
  • Do not apply the 54 A peak-current value of the 8AA4 or 8AD0 to this AA3 module.
  • Confirm Control Unit firmware, DRIVE-CLiQ topology, motor data, feedback and safety configuration.
  • Review the original motor connector and cable termination before selecting a later C/D-type module.
  • Check cabinet airflow, mounting width, DC-link bus arrangement and 24 V distribution.
  • Preserve the approved parameter set and compare hardware recognition data during commissioning.

05Replacement

  • Siemens classifies this generation as a spare-part / phased-out product.
  • The defined immediate successor is 6SL3120-1TE21-8AA4.
  • The AA4 generation adds a threefold 54 A peak-current capability, so drive behavior and protection settings still require validation.
  • Later C/D-type migration can change the motor-connection system and may require the prescribed adapter cable.
  • Commission the replacement using the approved drive project and test overload response, braking, feedback, diagnostics and safety functions.

06FAQ

What is the maximum current of the 8AA3 generation?

Siemens catalog data specifies 36 A maximum current for 6SL3120-1TE21-8AA3.

How does 8AA3 differ from the later 8AA4 overload capability?

Both are rated at 18 A, but the AA3 maximum current is 36 A while the AA4 data sheet specifies 54 A.

Which intermittent-duty value applies to 6SL3120-1TE21-8AA3?

The documented S6 value at 40 percent duty is 24 A.

What is the immediate successor for the AA3 article?

Siemens identifies 6SL3120-1TE21-8AA4 as the successor generation.

Can an 8AD0 be chosen solely because it is also rated at 18 A?

No. Connection technology, peak current, power-unit code, firmware, safety functions and the installed project must all be compared.

Which data should be checked after an AA3 replacement is recognized?

Verify the detected power section, current ratings, motor data, DRIVE-CLiQ topology, encoder feedback and the configured safety functions before machine operation.

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