Siemens 6SL3210-1KE11-8AF2 — SINAMICS G120C VFD Buyer Review

By Abdullah Zahid
13 min read
Siemens 6SL3210-1KE11-8AF2 SINAMICS G120C compact frequency converter inverter drive for motor control

Siemens 6SL3210-1KE11-8AF2 SINAMICS G120C Compact Frequency Converter: Specifications, Selection Criteria, and Alternatives

Controls engineers and procurement specialists searching the Siemens 6SL3210-1KE11-8AF2 by catalog number are typically at the final validation stage — confirming that a 0.55 kW compact inverter with PROFINET and EtherNet/IP support will handle their motor load, fit the enclosure, and arrive before the project deadline. This article addresses exactly that: the hard specs, the overload decision, the cable constraints, the right variant comparison, and when this model is not the right call. The 6SL3210-1KE11-8AF2 is part of the SINAMICS G120C compact frequency converter family, rated at 380–480V 3AC input, housed in a 73 x 173 x 160 mm frame at 1.40 kg, and carrying a 97% efficiency rating.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the 6SL3210-1KE11-8AF2 — and Who Shouldn't

This drive is the right choice when all of the following criteria are met:

  • Site input power is 380–480V 3AC (±10% / -20%) at 47–63 Hz — this model does not accept single-phase input under any configuration.
  • Motor rated power is 0.55 kW or below at Low Overload (LO) rating, or 0.37 kW or below at High Overload (HO) rating.
  • Physical footprint of 73 x 173 x 160 mm fits available panel or enclosure space, with clearance for 0.005 m³/s cooling airflow.
  • Control network uses PROFINET or EtherNet/IP — legacy fieldbus protocols such as Modbus RTU or PROFIBUS are not supported natively.
  • Motor cable run is 50 m or less (shielded) or 100 m or less (unshielded) without intermediate filtering.
  • IP20 open enclosure protection rating meets the environmental conditions at the installation site.

If motor power exceeds 0.55 kW, step up to the 6SL3210-1KE15-8AF2 (0.75 kW LO, same FSAA frame) or a higher model in the SINAMICS G120C range. If IP54 or higher ingress protection is mandatory, an external enclosure is required — this unit ships as open type only.

On this page:

What the 6SL3210-1KE11-8AF2 Actually Does in a Drive System

The Siemens 6SL3210-1KE11-8AF2 is a compact three-phase variable frequency drive from the SINAMICS G120C family. Its primary function is to convert fixed-frequency AC supply power into variable-frequency, variable-voltage output — giving the control system precise authority over motor speed, torque, and acceleration profile without mechanical throttling or bypass dampers. At rated output, it delivers up to 2.6 A maximum output current with a pulse frequency of 4 kHz, across an output frequency range of 0–240 Hz in vector control mode or 0–550 Hz in V/f mode.

Unlike larger drives that dominate cabinet space, the FSAA frame measures just 73 x 173 x 160 mm and weighs 1.40 kg. The integrated air-cooled fan — requiring 0.005 m³/s airflow — keeps thermal management internal, removing the need for external cooling infrastructure in most standard installations. The drive carries an efficiency rating of 97%, with a total power loss of 33.8 W at rated output, and produces a sound level of 49 dB at 1 m — both relevant figures for energy accounting and noise-sensitive environments.

Two motor control modes are available: vector control (field-oriented) for applications needing precise torque regulation, and V/f control for simpler fan and pump loads where speed ratio is the primary variable. Six digital inputs, one non-isolated analog output, and a motor temperature sensor input (PTC/KTY compatible) give engineers the I/O depth needed for most small motor control applications without external expansion modules.

Typical System Architecture for the SINAMICS G120C

The 6SL3210-1KE11-8AF2 sits between the facility power distribution panel and the motor terminal box, converting 380–480V 3AC fixed-frequency supply into a controlled variable-frequency output. In a typical Siemens PROFINET architecture, the drive connects upstream to an industrial Ethernet switch and downstream to the motor via shielded cable up to 50 m.

  • Facility power panel (380–480V 3AC, 47–63 Hz) feeds through an upstream circuit breaker or fuse — external protection is required, as the drive does not include integrated circuit protection.
  • The 6SL3210-1KE11-8AF2 receives 3-phase power at L1, L2, L3 terminals and conditions it through internal rectification and PWM inversion.
  • A PROFINET or EtherNet/IP connection (via RJ45 port) links the drive to a PLC or controller, enabling parameter writes, speed commands, and diagnostic reads over the control network.
  • Motor output (U, V, W, PE) connects via shielded cable — 50 m maximum — to the three-phase motor terminal box; shield bonding at both ends is required for EMI immunity.
  • Optional analog feedback (speed reference potentiometer or motor temperature sensor via PTC/KTY input) connects via signal cable up to 15 m maximum length.

Where This Drive Gets Specified: Industries and Use Cases

Conveyor belt systems in distribution centers and light manufacturing are among the most common deployment environments for this drive. Variable-speed control lets operators tune belt speed to production rate in real time, reducing energy draw during partial-load periods and eliminating the mechanical shock of direct-on-line starting.

In HVAC and building services, pump and fan motors running on the 6SL3210-1KE11-8AF2 benefit directly from the drive's soft-start and speed modulation capability. Centrifugal fan and pump loads follow the cube law — cutting motor speed by even 20% reduces power consumption by roughly the cube of that ratio, making a 97%-efficient VFD a practical energy reduction tool at this power range.

Packaging and labeling machinery integrators specify the SINAMICS G120C compact range where multiple small-motor axes need coordinated variable-speed control in a compact cabinet. The 73 x 173 x 160 mm frame allows multiple drives to be mounted side-by-side in a standard 19-inch or DIN-rail panel without consuming disproportionate space.

Retrofit applications — replacing fixed-speed starters on existing conveyor, pump, or fan motors — represent a significant share of demand for this catalog number. The drive's PROFINET and EtherNet/IP support means it can drop into a modern control architecture without protocol conversion hardware.

Application Typical Deployment
Conveyor belt speed control Distribution center or manufacturing line; variable-speed via PROFINET setpoint from PLC
HVAC pump and fan motor Chilled water pump or supply fan; soft-start and flow optimization via analog speed reference
Packaging and labeling machine Multiple compact drives in a shared cabinet; EtherNet/IP coordination with motion controller
Fixed-speed motor retrofit Replacement of direct-on-line starter on existing 0.37–0.55 kW motor; energy savings justification
Small process motor (spindle, mixer) Variable-speed process control; vector control mode for responsive torque management

Key Specifications: What Matters at Purchase Decision Time

Specification Value
Input Voltage 380–480V 3AC (+10% / -20%)
Input Frequency 47–63 Hz
Rated Output Power (LO / HO) 0.55 kW / 0.37 kW
Rated Output Current (LO / HO) 1.70 A / 1.30 A
Maximum Output Current 2.6 A
Dimensions (W x H x D) 73 x 173 x 160 mm
Protection Rating IP20 / UL open type
Operating Temperature -10 to 40°C
Communication Protocols PROFINET, EtherNet/IP
Efficiency 97%

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

LO vs. HO Overload Rating: How to Choose the Right Profile

The 6SL3210-1KE11-8AF2 is available in two overload configurations, and selecting the wrong one against your actual load profile is one of the most common ordering mistakes for this catalog number.

The Low Overload (LO) rating supports 150% of base load current for 3 seconds, followed by 110% for 57 seconds within a 300-second duty cycle, at a rated output power of 0.55 kW. This is the correct choice for continuously running motor applications — conveyors, fans, pumps — where load spikes are brief and infrequent. The rated input current at LO is 2.30 A.

The High Overload (HO) rating supports 200% of base load current for 3 seconds, followed by 150% for 57 seconds in the same 300-second cycle, but at a reduced rated output power of 0.37 kW. The rated input current drops to 1.90 A at HO. This configuration is required for intermittent or shock-load duty cycles — hoists, crushers, punch presses — where the motor must produce transient torque well above continuous rating without tripping the drive.

The decision rule is straightforward: map your motor's peak load demand duration against the overload profile table. If your application demands more than 150% current for longer than 3 seconds regularly, the HO variant is required. If your motor runs at or near rated current with only occasional brief spikes, LO is sufficient and gives you the higher continuous power rating of 0.55 kW.

6SL3210-1KE11-8AF2 vs. 6SL3210-1KE15-8AF2 and Other G120C Variants

Model Number LO Power Rating HO Power Rating Frame Size Key Difference
6SL3210-1KE11-8AF2 0.55 kW 0.37 kW FSAA (73 x 173 x 160 mm) Smallest power rating in the G120C range; most space-constrained applications
6SL3210-1KE15-8AF2 0.75 kW 0.55 kW FSAA Next power step up; identical form factor; direct upgrade path without cabinet rework
6SL3210-1KE21-8AF2 1.1 kW — Larger footprint Higher power; larger frame; same communication and I/O architecture

If your motor is rated at 0.75 kW and you need room to grow without changing the cabinet layout, the 6SL3210-1KE15-8AF2 uses the same FSAA frame dimensions and shares the same PROFINET/EtherNet/IP architecture — check current availability at LeadTime.ca for both models.

Expert Verdict: Honest Assessment for Engineers and Procurement

The Siemens 6SL3210-1KE11-8AF2 earns its place in projects where three things align: the motor is at or below 0.55 kW, the control network already runs PROFINET or EtherNet/IP, and panel space is genuinely constrained. The FSAA frame at 73 x 173 x 160 mm and 1.40 kg is hard to beat for that combination. The 97% efficiency rating and 33.8 W total power loss at rated output mean thermal management in a shared panel is straightforward. For OEM machine builders assembling multiple small-motor axes into a modular cabinet, or plant engineers retrofitting aging direct-on-line starters, this is a well-matched, well-supported catalog item with a clear upgrade path (6SL3210-1KE15-8AF2) when motor power grows.

Where this drive has real limits: it does not accept single-phase input under any condition, the IP20 open type rating requires a clean, dry installation environment (or an external enclosure rated for the ambient conditions), and the 50 m shielded cable limit will be a binding constraint in large plant layouts. Engineers needing Modbus RTU or PROFIBUS DP communication must look elsewhere in the Siemens portfolio — those protocols are not supported on this catalog number. For applications with heavy shock loads exceeding the HO overload cycle, confirm the 200% for 3 seconds profile is sufficient before committing; the drive is not rated for sustained overcurrent beyond the defined duty cycle.

On the procurement side, this is an active product — not approaching end-of-life — but lead times in the compact VFD segment can vary. Confirming availability before design lock is practical advice, not a formality. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

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

Wiring and Installation: What to Know Before You Start

  • Connect 3-phase input power (L1, L2, L3) and protective earth (PE) to the inverter input terminals; confirm supply voltage is within 380–480V 3AC (±10% / -20%) before energizing.
  • Connect motor output (U, V, W, PE) using shielded cable — maximum 50 m for shielded, 100 m for unshielded — with shield bonded at both ends to suppress EMI; signal cable runs are limited to 15 m.
  • Bond the inverter housing ground (M4 screw on housing) to the facility ground bar; this step is mandatory for EMI immunity and electrical safety compliance.
  • Confirm 0.005 m³/s cooling airflow is available at the installation location; the integrated fan requires unobstructed intake and exhaust — do not fully enclose the drive without provision for forced ventilation.
  • External circuit protection (circuit breaker, contactor, or fuse) must be installed at the input; the drive does not include integrated overcurrent protection at the input terminals.

Compatible Communication and System Integration

The 6SL3210-1KE11-8AF2 supports two industrial Ethernet protocols natively, which determines how it integrates into the broader control architecture:

  • PROFINET — native real-time communication with SIMATIC PLCs and PROFINET-capable industrial Ethernet switches; enables parameter writes, speed setpoints, and diagnostic reads over a standard Ethernet infrastructure.
  • EtherNet/IP — compatible with EtherNet/IP controllers, making the drive a viable choice in cross-vendor architectures where a PROFINET-only drive would require protocol conversion hardware.
  • Motor temperature sensor input accepts PTC and KTY sensors, allowing direct thermal monitoring of the connected motor without an external measurement module.
  • Six digital inputs (switching level 11V for 0→1 transition, 5V for 1→0) and one fail-safe differential digital input support direct wiring of control logic, interlock circuits, and safety-relevant signals.
  • Siemens STARTER software provides parameter configuration, motor characteristic entry, control mode selection (vector or V/f), and diagnostic access over the PROFINET or EtherNet/IP connection.

Wrong-Part Prevention Checklist Before You Order

Before placing an order for the 6SL3210-1KE11-8AF2, verify each of the following points against your application requirements:

  1. Confirm site input voltage is 380–480V 3AC (±10% / -20%) and frequency is 47–63 Hz; this model does not support single-phase input.
  2. Verify motor rated power does not exceed 0.55 kW at Low Overload (LO) or 0.37 kW at High Overload (HO) rating.
  3. Check available motor cable run length; maximum shielded cable length is 50 m, unshielded is 100 m.
  4. Confirm communication protocol requirement (PROFINET or EtherNet/IP); if Modbus RTU or other legacy protocol is needed, a different model may be required.
  5. Verify IP20 open enclosure type meets environmental requirements; if IP54 or higher protection is needed, external mounting must be specified.
  6. Check overload profile: Low Overload (150% for 3s + 110% for 57s in 300s cycle) or High Overload (200% for 3s + 150% for 57s in 300s cycle); choose matching variant.
  7. Confirm enclosure mounting and cooling air requirement (0.005 m³/s) can be satisfied at installation location.
  8. Verify local North American electrical codes (UL, cUL) and CE compliance are acceptable for the application region.

If any item on this checklist does not match your application, contact the LeadTime.ca team to identify the correct catalog number before committing to an order.

Frequently Asked Questions

Can the 6SL3210-1KE11-8AF2 operate on single-phase input power?

No. The 6SL3210-1KE11-8AF2 requires 380–480V 3AC input at 47–63 Hz. There is no single-phase input configuration available for this catalog number. If your site supply is single-phase, a different drive model is required.

What is the difference between the LO and HO overload ratings for this drive?

Low Overload (LO) supports 150% of base current for 3 seconds, then 110% for 57 seconds in a 300-second duty cycle, with a rated output of 0.55 kW. High Overload (HO) supports 200% for 3 seconds, then 150% for 57 seconds in the same cycle, but at a reduced rated output of 0.37 kW. Choose LO for continuous-duty fan and pump loads; choose HO for shock-load or intermittent-duty applications like hoists or crushers.

What is the maximum motor cable length, and when is shielded cable required?

The maximum motor cable length is 50 m for shielded cable and 100 m for unshielded cable. Shielded cable with bonded shield at both ends is strongly recommended for runs over short distances in electrically noisy environments, as longer unshielded runs increase the risk of EMI-induced control errors. Signal cable is limited to 15 m regardless of cable type.

Does this drive work with non-Siemens PLCs and controllers?

Yes. The EtherNet/IP protocol support on the 6SL3210-1KE11-8AF2 allows integration with EtherNet/IP-capable controllers from other vendors. PROFINET is available for Siemens SIMATIC and compatible third-party controllers. Legacy fieldbus protocols such as Modbus RTU, PROFIBUS DP, or CANopen are not natively supported on this catalog number.

What certifications does the 6SL3210-1KE11-8AF2 carry?

The drive complies with CE, cUL, UL, KC, EAC, and C-Tick (RCM) standards, covering North American, European, and Asia-Pacific regulatory requirements. An integrated Class A EMC filter is included, so no additional line-side filtering is required under normal operating conditions. Installation must still comply with local electrical codes, including the Canadian Electrical Code or NEC as applicable.

What is a realistic lead time for the 6SL3210-1KE11-8AF2?

Lead time varies by distributor, region, and current stock levels. In North American markets, the typical window for this product has been in the range of 4–8 weeks from order to delivery, depending on whether the unit is drawn from distributor stock or manufactured to order. Confirming availability and delivery date before design lock is strongly recommended, particularly for production-critical equipment. Contact LeadTime.ca for a current availability check.

Why Order the 6SL3210-1KE11-8AF2 from LeadTime.ca

  • LeadTime.ca ships worldwide — no geographic restriction on order destination.
  • Hard-to-source catalog numbers and low-volume orders are handled with the same process as high-volume procurement.
  • Volume pricing and project-quantity quotes are available directly from the team — not through an automated tier system.
  • Lead time and stock status can be confirmed before you commit to a design or purchase order.
  • Responsive technical and commercial support for engineers and procurement specialists at any stage of a project.

At-a-Glance Summary

  • Catalog number: 6SL3210-1KE11-8AF2 — SINAMICS G120C Compact Frequency Converter, FSAA frame
  • Rated output: 0.55 kW at Low Overload (LO), 0.37 kW at High Overload (HO)
  • Input requirement: 380–480V 3AC (+10% / -20%), 47–63 Hz — three-phase only, no single-phase support
  • Physical dimensions: 73 x 173 x 160 mm, 1.40 kg; IP20 open type enclosure
  • Efficiency: 97%; total power loss at rated output: 33.8 W; sound level: 49 dB at 1 m
  • Communication: PROFINET and EtherNet/IP natively supported; no Modbus RTU or PROFIBUS on this model
  • Motor cable limits: 50 m shielded, 100 m unshielded; signal cable maximum 15 m
  • Overload: LO = 150% for 3s + 110% for 57s (300s cycle); HO = 200% for 3s + 150% for 57s (300s cycle)
  • Cooling: Integrated air-cooled fan; 0.005 m³/s airflow required at installation location
  • Certifications: CE, cUL, UL, KC, EAC, C-Tick (RCM); Class A integrated EMC filter included
  • Direct upgrade path (same FSAA frame): 6SL3210-1KE15-8AF2 at 0.75 kW LO / 0.55 kW HO