Siemens 6SL3210-1KE21-7AP1 SINAMICS G120C Drive
The Siemens SINAMICS G120C drive (6SL3210-1KE21-7AP1) is a versatile, compact frequency inverter for controlling three-phase motors. With a rated power of 7.5 kW for Low Overload (LO) / 5.5 kW for High Overload (HO) in the 400V class, it is ideal for handling demanding industrial tasks while maintaining high efficiency. The G120C series offers the best price-to-performance ratio, delivering powerful features such as integrated safety (STO), an A-class filter, and extensive I/O capabilities in a user-friendly design.
Key Specifications
Rated Power (LO): 7.5 kW (150% overload for 3s, 110% for 57s)
Rated Power (HO): 5.5 kW (200% overload for 3s, 150% for 57s)
Input Voltage: 3-phase 380-480V AC (+10/-20%), 47-63 Hz
Rated Output Current (HO): 12.5 A; Maximum 25 A
Integrated Filter: Class A (integrated, complies with EMC standards)
I/O Interface: 6 DI, 2 DO, 1 AI, 1 AO
Safe Torque Off (STO): Integrated
Fieldbus: PROFIBUS DP (integrated)
Protection Class: IP20 / UL Open Type
Dimensions (H x W x D): 196 x 100 x 203 mm (Frame Size FSB)
Output Frequency Range: 0 to 550 Hz
Efficiency Class: IE2
Ambient Temperature: -10 to 40°C without derating
High-Performance Overload Capability
G120C drives are classified with both a Low Overload (LO) and High Overload (HO) rating. With a HO rating of 5.5 kW, the drive can deliver 200% of its rated current for 3 seconds, making it ideal for applications with high starting torque, such as conveyors, compressors, and mixers. This high overload capability allows users to safely size the drive for dynamic loads without oversizing.
Comprehensive Communication and I/O
The integrated PROFIBUS DP interface ensures seamless integration into Siemens automation landscapes, enabling high-speed cyclic data exchange with the controller. The built-in I/O interface supports six digital inputs, two digital outputs, and one analog input/output, providing standard connectivity without extra modules.
Functional Safety via Safe Torque Off (STO)
Integrated Safe Torque Off (STO) prevents the motor from starting unintentionally, eliminating the need for external main contactors in many safety circuits. Certified to SIL 3 (IEC 61508) and PL e (ISO 13849-1), it allows the machine to achieve high safety integrity levels without additional hardware, reducing panel space and simplifying design.
Energy Efficiency and Integrated Filter
The SINAMICS G120C incorporates a Class A integrated line filter that ensures compliance with EMC standards, minimizing panel space and installation effort. It also features an IE2 energy efficiency class, and its parameterization tools support energy-saving optimization for fan and pump applications. The drive features an IE2 energy efficiency class, and its parameterization tools support energy-saving optimization for fan and pump applications.
Application Versatility
The drive is suited for a wide range of applications, including pumps and fans (HVAC), compressors, extruders, agitators, horizontal conveyors, and test stands. Its compact, power-dense design (196 x 100 x 203 mm) together with a broad portfolio of integrated functionalities makes the 6SL3210-1KE21-7AP1 a key component for building high-performance drive systems.
Conclusion
Combining powerful performance, compact design, and advanced safety features, the Siemens 6SL3210-1KE21-7AP1 SINAMICS G120C is the ideal variable frequency drive for applications requiring reliable motor control, communication integration, and energy savings.
