Siemens 6SL3210-1KE21-7AF1 – SINAMICS G120C – Compact Inverter 7.5 kW with PROFINET and STO

Technical Description

The Siemens 6SL3210-1KE21-7AF1 is a compact inverter from the SINAMICS G120C family, designed for high-performance industrial applications requiring efficient motor control, reliability, and maximum integration in automated production environments.

This drive provides a rated power of 7.5 kW and supports 150% overload for 3 seconds, making it suitable for applications with variable loads and demanding acceleration dynamics. It operates with a supply voltage of 3AC 380–480 V (+10% / –20%) and a frequency range of 47–63 Hz, ensuring stable performance across diverse industrial conditions.

The inverter includes an integrated Class A EMC filter, reducing electrical noise and ensuring compliance in industrial environments.
Its I/O interface includes 6 digital inputs, 2 digital outputs, 1 analog input and 1 analog output, enabling flexible integration with machine control systems.

The unit features Safe Torque Off (STO) safety functionality and an integrated PROFINET PN interface, allowing seamless communication with SIMATIC PLCs and other industrial networks.
It has a protection rating of IP20 / UL Open Type and belongs to size FSB (196 × 100 × 225.4 mm). External 24 V supply is supported.

Compact, robust and designed for continuous operation, the SINAMICS G120C 6SL3210-1KE21-7AF1 is ideal for modern automation environments requiring efficiency, reduced maintenance, and operational continuity.

⚙️ Main Features – Siemens 6SL3210-1KE21-7AF1

• Type: Compact inverter for AC motor control

• Family: SINAMICS G120C

• Rated power: 7.5 kW

• Overload capability: 150% for 3 seconds

• Input voltage: 3AC 380–480 V (+10% / –20%)

• Frequency range: 47–63 Hz

• Integrated filter: EMC Class A

• I/O interface: 6 DI, 2 DO, 1 AI, 1 AO

• Safety functions: STO (Safe Torque Off)

• Communication: PROFINET PN integrated

• Protection: IP20 / UL Open Type

• Size: FSB – 196 × 100 × 225.4 mm (H × W × D)

• External 24 V: Supported

• Packaging unit: 1 piece

🏭 Typical Applications – Siemens 6SL3210-1KE21-7AF1

• Automated production lines

• Conveyor and material-handling systems

• Packaging and assembly machinery

• Pumps, fans, compressors

• General purpose motor control

• OEM machinery with compact installation needs

• Retrofit of G120C-based systems

🔧 E-Repair Services for Siemens 6SL3210-1KE21-7AF1

As a Siemens Approved Partner – Industry Services and the only authorized Service Partner in Europe, E-Repair offers complete maintenance and remanufacturing services for SINAMICS G120C inverters.

Available services:

🔧 Siemens-certified repair in our internal laboratory
♻️ Complete remanufacturing with replacement of critical components (IGBT, power boards, capacitors, drivers)
🚚 Advance shipment of a remanufactured or new inverter (if available)
🧰 On-site and remote technical assistance
💾 Backup and restoration of drive parameters
🌐 Technological cleaning and anti-contamination treatment
🚨 Full functional testing on Siemens original benches
✅ 12-month warranty, extendable up to 24 months

Applied Standards

• BS 8001:2017 – Circular Economy

• AFNOR XP X30-901:2018

• ISO 14064-1 – Carbon Footprint (Scope 3)

🛡️ Warranty and Sustainability

Remanufactured or repaired SINAMICS G120C inverters from E-Repair offer performance equivalent to new units, reduce downtime, and lower maintenance costs.

All processes are Siemens-certified, ensuring full traceability, RAEE reduction, and alignment with ESG, Industry 5.0, and European sustainability frameworks.

🌍 Conclusion

The Siemens 6SL3210-1KE21-7AF1 is a compact, reliable inverter ideal for a wide range of industrial applications.
Through E-Repair’s certified services, companies can extend the inverter’s lifecycle, ensure production continuity, and optimize operational costs.

❓ Frequently Asked Questions (FAQ) – Siemens 6SL3210-1KE21-7AF1

Can I send my faulty inverter for repair?
✔️ Yes, through the request form on E-Repair’s official website.

Is an advance replacement unit available?
✔️ Yes, if a remanufactured module is in stock.

Is the inverter tested before delivery?
✔️ Every unit is tested on original SINAMICS benches with real operating simulations.