Siemens sl3120-2te21-0ad0

By Abdullah Zahid
11 min read
Siemens 6SL3120-2TE21-0AD0 SINAMICS S120 Double Motor Module Booksize D-type for dual AC motor control in industrial automation cabinets

Siemens 6SL3120-2TE21-0AD0 SINAMICS S120 Double Motor Module: Specifications, Wiring Overview, and Replacement Options

When a dual-motor drive module fails in a running production line, the priority shifts immediately to three questions: Is the exact part available? What is the lead time? And is there a viable alternative that gets the line running faster? The Siemens 6SL3120-2TE21-0AD0 is a SINAMICS S120 Double Motor Module that delivers dual independent 3-phase 400 V outputs at 9 A per motor channel from a DC 600 V input bus — a specific power conversion role inside a modular drive cabinet that cannot simply be substituted with a generic VFD. This review covers verified electrical specifications, honest procurement reality for a phase-out product, and a clear comparison of alternatives so you can make the right call before committing a purchase order.

If you have already confirmed this is the correct part for your system, check current pricing and stock availability at LeadTime.ca — we source and ship worldwide.

Is the 6SL3120-2TE21-0AD0 the Right Module for Your Application?

This module is the right choice when all of the following conditions apply to your system:

  • You have two independent AC motor loads, each operating at or below 9 A rated current on a 3-phase 400 V output
  • Your cabinet provides a DC 600 V internal bus from a connected rectifier or external DC source — this module does not accept 3-phase mains directly
  • Your enclosure accommodates the Booksize D-type form factor and provides a minimum 0.009 m³/s cooling air circulation pathway
  • A compatible SINAMICS S120 control unit with DRIVE-CLIQ interface is already present or will be installed alongside this module
  • Your organization has confirmed that a 240-day or longer ex-works lead time is acceptable, or that legacy stock has been located through a distributor

If either motor in your application exceeds 9 A, evaluate the 6SL3120-2TE21-1AH0 (13 A per motor). If only one motor requires control, the 6SL3120-1TE21-0AD0 single motor module eliminates the unused output channel. For new system designs where legacy constraints do not apply, SINAMICS G120 PLUS offers active support, faster lead times, and a compact form factor — though with a different electrical interface and commissioning environment.

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What the 6SL3120-2TE21-0AD0 Actually Does Inside a Drive Cabinet

The 6SL3120-2TE21-0AD0 is not a standalone variable frequency drive. It is a power conversion module — a power block — that sits on the DC bus inside a SINAMICS S120 modular drive cabinet and converts that DC voltage into two independent 3-phase AC outputs for motor control. The DC 600 V input comes from a separate rectifier or active line module already installed in the same cabinet system. The 6SL3120-2TE21-0AD0 then produces two separate 3-phase 400 V outputs, each rated at 9 A, allowing two motors to be controlled independently in speed, torque, and direction — all from a single Booksize D-type module that weighs 4.7 kg and occupies approximately 150 mm height by 50 mm width by 270 mm depth of cabinet space.

Motor command and diagnostics travel through a DRIVE-CLIQ connection to a compatible SINAMICS S120 control unit such as a 6SL3100-series module. The control unit handles all motion logic; the 6SL3120-2TE21-0AD0 handles the power switching. This separation of control and power is what makes the SINAMICS S120 architecture modular and scalable — but it also means this module cannot function without the rest of that ecosystem in place. The module carries CE marking, cULus certification, and has been RoHS compliant since May 5, 2017.

Typical SINAMICS S120 System Architecture

The 6SL3120-2TE21-0AD0 occupies the power conversion layer between the DC bus and the motor terminals. Understanding where it sits in the signal and power chain prevents incorrect ordering and commissioning errors.

  • 3-phase mains supply feeds an Active Line Module or Basic Line Module (rectifier), which produces the DC 600 V internal bus
  • The DC bus is distributed across all motor modules in the cabinet, including the 6SL3120-2TE21-0AD0
  • A SINAMICS S120 Control Unit (e.g., 6SL3100-series) connects to the 6SL3120-2TE21-0AD0 via DRIVE-CLIQ, issuing speed and torque commands and receiving diagnostic data
  • The 6SL3120-2TE21-0AD0 outputs two independent 3-phase 400 V signals through connectors X1 and X2, each feeding one AC motor
  • DC 24 V control power, supplied separately, powers the module logic and communication interface (maximum 0.90 A)

Industries and Applications Where This Module Is Deployed

The 6SL3120-2TE21-0AD0 is most commonly found in systems where two motors must be controlled from a single compact module without duplicating cabinet hardware. Dual conveyor applications — such as supply and takeaway rollers on packaging or printing lines — are a natural fit because each motor channel at 9 A can be independently ramped, stopped, or reversed without affecting the other channel.

In pump and compressor systems, two hydraulic or centrifugal pumps operating in load-sharing or backup configurations benefit from the coordinated output this module provides while remaining within the 9 A per channel rating. Multi-spindle machine tools — where a main spindle and an auxiliary spindle run simultaneously with different load profiles — represent another established deployment scenario in metalworking and CNC environments.

Dual fan or blower systems in HVAC or industrial process ventilation use this module to control two large fans in series or parallel ductwork with independent speed regulation. Water treatment plants with dual-pump lift or discharge stages also appear regularly in field installations of this module family.

Application Typical Deployment
Dual conveyor lines Independent speed control of supply and takeaway rollers on packaging or printing lines
Multi-spindle machine tools Simultaneous main spindle and auxiliary spindle control with different load profiles
Dual hydraulic pump systems Load-sharing or backup pump operation within a 9 A per motor current envelope
Tandem fan or blower systems Two industrial fans in series or parallel ductwork with independent speed regulation
Water treatment dual-pump stages Influent/effluent or lift/discharge pump pairs in process automation cabinets
Production line segment automation Feed, process, and discharge motor stages controlled from a single SINAMICS S120 cabinet

Purchase-Decision Specifications and Variant Comparison

Parameter Specification
DC Input Voltage 600 V DC
DC-Link Current (Max) 22.0 A
AC Output Voltage 3-phase 400 V (dual channels)
Output Current per Motor (Rated) 9.0 A per channel
Peak Current per Motor (Imax) 27.0 A per channel
Control Power Supply DC 24 V, -15% to +20%
Ambient Operating Temperature 0 to 40°C (32 to 104°F)
Form Factor Booksize D-type
Protection Class IP20 / UL open type
Net Weight 4.7 kg

Full technical specifications are available on the product page at LeadTime.ca.

Feature 6SL3120-2TE21-0AD0 6SL3120-2TE21-1AH0 6SL3120-1TE21-0AD0 SINAMICS G120 PLUS
Motor Channels 2 2 1 Varies (configurable)
Output Current per Motor 9 A 13 A 9 A Up to 17 A
Input Voltage DC 600 V DC 600 V DC 600 V 3-phase 380–480 V (direct)
Form Factor Booksize D-type Booksize D-type Booksize D-type Compact frame
Lead Time (Typical) 240 days 240 days 180 days 60–90 days
Product Status Phase-out (2016) Phase-out (2016) Phase-out (2016) Active support
Cost (Relative) Baseline (legacy) ~15–20% higher ~15% lower ~30–50% higher (full system)
Best Use Case Legacy dual-motor replacement Higher-current dual-motor apps Single motor replacement New system design / full upgrade

If your application requires more than 9 A per motor channel, the 6SL3120-2TE21-1AH0 is the correct S120 Booksize alternative — check current availability at LeadTime.ca and our team can confirm which variant is in stock.

Expert Procurement Verdict: Legacy Stock, Lead Times, and Honest Limits

The 6SL3120-2TE21-0AD0 does exactly what a dual-motor 9 A booksize module should do inside a SINAMICS S120 system — it delivers two independent, fully controllable 3-phase outputs from a shared DC bus in a compact 4.7 kg Booksize D-type footprint. Its CE and cULus certifications reduce compliance risk in regulated environments, and its DRIVE-CLIQ integration means diagnostics and safety functions available in the wider SINAMICS S120 ecosystem carry through to this module. For a maintenance replacement in a running production system where the existing cabinet architecture is sound and both motors operate within 9 A, this remains the most direct solution.

The honest constraint is the phase-out status declared October 1, 2016. Ex-works lead times run 240 days or more, which creates a real problem for unplanned failures. Organizations running this module in critical production environments should evaluate stocking a spare now while authorized distributor channels still carry legacy inventory. If your application is a new design or if the existing SINAMICS S120 cabinet is itself at end of life, the capital cost of upgrading to an actively supported platform — SINAMICS G120 PLUS offers 60–90 day typical lead times and active manufacturer support — should be weighed against the recurring risk of sourcing phased-out modules on tight timelines. If either motor in the system exceeds 9 A, do not attempt to run at overcurrent; the 6SL3120-2TE21-1AH0 at 13 A per motor is the correct S120 path.

At LeadTime.ca, we source legacy and active Siemens drive components through authorized channels with worldwide shipping. If this matches your system requirements, view current stock and pricing at LeadTime.ca before lead times extend further.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

The following points summarize key requirements for installing the 6SL3120-2TE21-0AD0. Engineers completing full installation should reference the Siemens SINAMICS S120 hardware installation manual for complete wiring diagrams and torque specifications.

  • DC 600 V bus connection: Wire sizing must be rated for the 22.0 A maximum DC-link current; the module requires pre-converted DC input — it does not connect directly to 3-phase mains
  • Motor outputs X1 and X2: Each connector accepts 1.5 to 6 mm² (16 to 10 AWG) conductors; both motor branches require correct phase sequence and insulation resistance of at least 1 MΩ phase-to-phase and phase-to-ground before energizing
  • Control power: DC 24 V supply with -15% to +20% tolerance connected to the control power terminals; maximum 0.90 A consumption; protect with an appropriate maximum 20 A device
  • DRIVE-CLIQ cable: Must be fully seated with locking tabs engaged between this module and the SINAMICS S120 control unit; verify firmware version compatibility before powering the system
  • Cooling: Internal air cooling requires a minimum 0.009 m³/s circulation pathway through the cabinet; verify no cable bundles or structural elements block the cooling air inlet or outlet before final installation

What Engineers Get Wrong When Ordering This Part

Before finalizing your purchase order for the 6SL3120-2TE21-0AD0, verify all six of the following conditions. These are the most common points where incorrect ordering or installation failures occur with this module.

  1. Confirm DC 600 V internal bus is available from a connected rectifier module or external DC source (module requires pre-converted DC input, not 3-phase mains)
  2. Verify two independent AC motor loads exist and each motor is within 9 A rated current (check motor nameplate)
  3. Check cabinet internal dimensions against booksize D-type footprint (typical: ~150 mm H × 50 mm W × 270 mm D); mounting rails must be standard SINAMICS profile
  4. Ensure cooling air circulation pathway exists (0.009 m³/s minimum); blocked or high-ambient environments degrade reliability
  5. Confirm product phase-out status accepted for organization; 240+ day lead times and future spare parts uncertainty may conflict with critical production timelines
  6. Verify DRIVE-CLIQ connection availability on control module; this module requires compatible control unit (e.g., 6SL3100 series or equivalent control module) to function

If any of the above checks reveal a mismatch, contact the LeadTime.ca technical team to identify the correct variant before ordering — incorrect module selection on a 240-day lead time item is a costly mistake.

Frequently Asked Questions

Can the 6SL3120-2TE21-0AD0 be connected directly to a 3-phase mains supply?

No. The 6SL3120-2TE21-0AD0 requires a DC 600 V input from an internal DC bus fed by a separate rectifier or active line module within the SINAMICS S120 cabinet. It cannot be connected directly to 3-phase mains — doing so will damage the module and presents a serious safety risk. Confirm the DC bus is present and delivering clean 600 V DC before installation.

What happens if one motor in my application runs above 9 A?

The rated output current per motor channel is 9.0 A. Although the module supports a peak current of 27.0 A per channel for short-duration transients, sustained operation above 9 A will trigger thermal derating or fault protection. If either motor in your application consistently exceeds 9 A, the 6SL3120-2TE21-1AH0 at 13 A per motor is the correct booksize S120 alternative.

The 6SL3120-2TE21-0AD0 was phased out in 2016 — can I still get one, and how long will it take?

The phase-out was declared October 1, 2016, but authorized distributors continue to carry legacy stock. Ex-works lead times from the manufacturer run approximately 240 days, which makes confirmed distributor stock the only practical option for time-sensitive replacements. Availability varies — contact LeadTime.ca to check current stock status before committing your production schedule.

Do both motor channels have to run simultaneously, or can I use only one?

The module supports independent operation of each channel — the two motor outputs do not need to run simultaneously. However, if only one motor is required for your application, the 6SL3120-1TE21-0AD0 single motor module is a more cost-efficient and logistically simpler choice rather than leaving one channel of the double module unused.

What control unit is required to operate the 6SL3120-2TE21-0AD0?

The module communicates exclusively via DRIVE-CLIQ and requires a compatible SINAMICS S120 control unit — the 6SL3100-series control modules are the standard pairing. The control unit handles all motion logic, motor parameterization, and safety functions. Verify that the existing control unit firmware version supports this specific module before installation.

What is the ambient temperature limit for this module, and what happens if it is exceeded?

The rated ambient operating temperature range is 0 to 40°C (32 to 104°F). Exceeding 40°C ambient, combined with the minimum 0.009 m³/s cooling air requirement not being met, will cause thermal alarms, output derating, or module shutdown. Cabinets in high-ambient environments require auxiliary cooling to maintain reliable operation within this specification.

Why Source the 6SL3120-2TE21-0AD0 Through LeadTime.ca

  • Global shipping — we supply controls engineers and procurement teams worldwide, not limited to a single region
  • Legacy and hard-to-find parts — phased-out Siemens SINAMICS S120 components are a core sourcing capability, not an exception
  • Lead time transparency — we confirm actual stock status and realistic delivery commitments before you place an order
  • Volume pricing available — recurring spare part needs and multi-unit orders can be discussed directly with our team
  • Technical order support — if a variant question arises during ordering, our team can help identify the correct part before a costly mismatch occurs

At-a-Glance Summary

  • Catalog number: 6SL3120-2TE21-0AD0 — SINAMICS S120 Double Motor Module, Booksize D-type
  • Input: DC 600 V; DC-link current maximum 22.0 A
  • Output: Two independent 3-phase 400 V channels, 9.0 A rated per motor, 27.0 A peak per motor
  • Control power: DC 24 V (-15% to +20%), maximum 0.90 A
  • Cooling: Internal air cooling, minimum 0.009 m³/s required
  • Operating temperature: 0 to 40°C; protection class IP20 / UL open type
  • Net weight: 4.7 kg; form factor approximately 150 mm H × 50 mm W × 270 mm D
  • Interface: DRIVE-CLIQ to SINAMICS S120 control unit (6SL3100-series or compatible)
  • Certifications: CE, cULus; RoHS compliant since May 5, 2017
  • Product status: Phase-out declared October 1, 2016; ex-works lead time approximately 240 days — confirm distributor stock before ordering
  • Higher-current alternative: 6SL3120-2TE21-1AH0 (13 A per motor); single-motor alternative: 6SL3120-1TE21-0AD0