VFD vs Servo Drive: Key Differences
A side-by-side comparison of VFD and servo drive motor type, feedback, dynamic response, overload rating, cost, and applications for industrial engineers.
- Part number
- 6SL3120-2TE21-8AD0
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· From Türkiye
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SINAMICS S120Siemens 6SL3120-2TE21-8AD0 SINAMICS S120 Double Motor Module 2x18A Booksize D Drive Module
SINAMICS S120 Double Motor Module, booksize D, 2x400V 3AC/18A output, 600V DC link input, 8.1 kg.
Description
About the 6SL3120-2TE21-8AD0
About the 6SL3120-2TE21-8AD0
The Siemens 6SL3120-2TE21-8AD0 is a SINAMICS S120 Double Motor Module (booksize frame size D) with 600 V DC link input and two independent 400 V 3AC outputs rated 18.0 A each (Imax 54.0 A), for internal air-cooled operation up to 40 °C. It ships with the DRIVE-CLiQ cable and supports extended Safety Integrated functions.
Selection Notes
As a Double Motor Module, this unit drives two independent 18.0 A axes (54.0 A peak each) from a shared 510-720 V DC link fed by an upstream Line Module, rather than acting as a standalone drive — pick it over two Single Motor Modules when both axes fit within the 18 A / 9.7 kW rating and cabinet space is the constraint. The 4.00 kHz pulse frequency and 650 Hz servo-control output frequency ceiling suit high-dynamic servo axes; V/f and vector control are also supported at lower output frequency limits (600 Hz and 300 Hz). Extended Safety Integrated support matters when either axis needs functional safety (e.g. SS1, SLS) without an external safety relay.
Applications
Driving two independent servo or induction motor axes up to 18.0 A each in a booksize SINAMICS S120 drive line-up — multi-axis machine tools, packaging, and handling equipment sharing one DC link.
Specification
Full specification
Rated data 13
| DC link voltage | DC 510 ... 720 V |
|---|---|
| Electronics power supply | DC 24 V -15 % / +20 % |
| Current demand, max. | 1.10 A |
| DC-link current Id | 43.0 A |
| Output current: Rated value IN | 18.0 A |
| Output current: Base load current IH | 15.3 A |
| Output current: For S6 duty (40%) IS6 | 24.0 A |
| Output current: Imax | 54.0 A |
| Type rating: Based on IN | 9.7 kW |
| Type rating: Based on IH | 8.2 kW |
| Current carrying capacity: DC link busbars | 200 A |
| Current carrying capacity: 24 V busbars | 20 A |
| DC link capacitance | 705 µF |
Ambient conditions 4
| Installation altitude (without derating) | 1,000 m (3,281 ft) |
|---|---|
| Cooling 8) | Internal air cooling |
| Cooling air requirement | 0.015 m³/s |
| Ambient temperature: During operation | 0 ... 40 °C (32 ... 104 °F) |
Connections 4
| Motor end: Version | connector (X1, X2) |
|---|---|
| PE connection | M5 screw |
| Max. motor cable length: Shielded | 70 m (230 ft) |
| Max. motor cable length: Unshielded | 100 m (328 ft) |
Show all 41 specifications ↓ Show less ↑20 more values in Identification, Standards, Mechanical data, General tech. specifications, Logistics.
Identification 6
| Part number | 6SL3120-2TE21-8AD0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| EAN | 4034106439736 |
Standards 2
| Compliance with standards | CE, cULus |
|---|---|
| Safety Integrated | SIL 2 acc. to IEC 61508, PL d acc. to EN ISO 13849-1, Category 3 acc. to EN ISO |
Mechanical data 6
| Line side: Width | 100.00 mm (3.94 in) |
|---|---|
| Line side: Height | 380.00 mm (14.96 in) |
| Line side: Depth | 270.00 mm (10.63 in) |
| Line side: Degree of protection | IP20 / UL open type |
| Line side: Type of construction | Booksize |
| Line side: Net weight | 7.7 kg (16.98 lb) |
General tech. specifications 2
| Sound pressure level (1m) | 60.0 dB |
|---|---|
| Page 1 of 1 | Generated Sun Nov 1 04:05:14 CET 2026 |
Logistics 4
| Shipping weight | 9.1 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | Low stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
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Quick answers
Questions about the 6SL3120-2TE21-8AD0
What is the rated current of 6SL3120-2TE21-8AD0?
The rated current of 6SL3120-2TE21-8AD0 is 18.0 A.
Which supply voltage is 6SL3120-2TE21-8AD0 rated for?
The rated operational voltage of 6SL3120-2TE21-8AD0 is 400 V AC.
What motor power is 6SL3120-2TE21-8AD0 rated for?
The rated motor power of 6SL3120-2TE21-8AD0 is 2 × 9.7 (based on IN) kW.
What is the HS code of 6SL3120-2TE21-8AD0 for customs?
The tariff (HS) code on file for 6SL3120-2TE21-8AD0 is 85044087.
What is the EAN of 6SL3120-2TE21-8AD0?
The EAN (GTIN) of 6SL3120-2TE21-8AD0 is 4034106439736.
Where does 6SL3120-2TE21-8AD0 ship from, and how fast?
6SL3120-2TE21-8AD0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
Guides
Guides for servo drives
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Series
Siemens SINAMICS S120
- Brand
- Siemens
- Series
- SINAMICS S120
