6SL3210-1KE21-3AF1 Siemens SINAMICS G120C Variable frequency drive

SINAMICS G120C, frame sizes FSAA to FSF, with Intelligent Operator Panel IOP‑2

SINAMICS G120C compact converters offer a well-balanced combination of features to address a wide range of applications. They are compact, rugged devices that are easy to operate and can be optionally equipped with a basic or advanced operator panel.

SINAMICS G120C converters are especially suitable when it comes to meeting the requirements of system integrators, OEMs and distributors regarding high productivity and tailored performance.

• Compact design
• Frame size FSAA allows easy DIN rail mounting
• Side-by-side design
• High power density, low envelope dimensions
• Simple installation in the tightest space
• Low space requirement
• Use in small control cabinets, close to the machine
• Optimized parameter set
• Optimized commissioning
• Compact Operating Instructions
• BOP‑2 or IOP‑2 Operator Panels can be used
• Integrated USB connection
• Simple and fast software parameter assignment
• Simple to use during commissioning and in operation
• Minimized training costs, existing SINAMICS know-how can be used
• High degree of service friendliness, simple maintenance
• Plug-in terminals
• Cloning function using BOP‑2, IOP‑2, or memory card
• Operating hours counter for “drive on” and “motor on”
• Fast mechanical installation
• Intuitive standard commissioning
• Component of Totally Integrated Automation
• Energy-efficient, sensorless vector control
• Automatic flux reduction with V/f ECO
• Integrated energy saving computer
• Safety Integrated (STO)
• Communication versions with PROFINET / EtherNet/IP, PROFIBUS DP, USS/Modbus RTU
• Wireless commissioning, operation and diagnostics via mobile device or laptop thanks to the optional SINAMICS G120 Smart Access
• Connection to the Cloud MindSphere with the optionally available SINAMICS CONNECT 300 IoT Gateway
• Varnished modules
• Operation up to an ambient temperature of 60 °C

Extended warranty

For SINAMICS G120C, Siemens offers an extended warranty of up to 6½ years:

• 12-month standard warranty
• Optional extension via Service Protect
  • Free for the first 6 months after registering the product at:
  • Subject to a charge for a further 3 or 5 years

You can find detailed information here:

SINAMICS G120C is a compact converter for control cabinet mounting in IP20 degree of protection where the Control Unit (CU) and Power Module (PM) function units are combined in one device.

The compact mechanical design and the high power density allow these devices to be installed in machine control enclosures and control cabinets for maximum space utilization. The SINAMICS G120C compact converter can be butt-mounted directly, without derating at temperatures up to 40 °C (104 °F).

SINAMICS G120C, frame size FSAA with BOP-2

SINAMICS G120C can be integrated into the widest range of applications, either using the integrated digital and analog inputs or via the integrated fieldbus interface (available in USS, Modbus RTU, PROFIBUS, PROFINET, EtherNet/IP versions). Especially the product versions with integrated PROFIBUS/PROFINET interface make full integration into the Siemens TIA family possible, therefore allowing the advantages of the seamless TIA product family to be fully utilized. SINAMICS G120C devices are preset in the factory so that they can be immediately connected to PROFIBUS or PROFINET fieldbus systems without parameterization.

Wireless commissioning, operation and diagnostics via mobile device or laptop thanks to the optional web server module SINAMICS G120 Smart Access enabling user-friendly operation and easy access to the converter, even if this is installed in areas difficult to access.

With the optionally available SINAMICS CONNECT 300 IoT Gateway, connection to the Cloud MindSphere is possible.

SINAMICS G120C is also equipped with the safety function STO (Safe Torque Off) as standard, which is used to safely stop drives. As a consequence, machine manufacturers can simply comply with current machinery directives with minimum associated costs.

SINAMICS G120C can control asynchronous (induction) motors in the power range from 0.37 kW up to 132 kW (0.5 hp to 200 hp). Reliable and efficient motor operation is achieved by using state-of-the-art IGBT technology combined with vector control. The extensive range of functions integrated in the SINAMICS G120C also offers a high degree of protection for the converter and motor.

Line-side components

Line filter

SINAMICS G120C can be ordered with or without integrated Class A line filters. Optionally, an external Class B line filter can be used for classifying in a higher interference class.

Line reactors

Line reactors smooth the current drawn by the converter and thus reduce harmonic components in the line current. Through the reduction of the current harmonics, the thermal load on the power components in the rectifier and in the DC link capacitors is reduced as well as the harmonic effects on the supply. The use of a line reactor increases the service life of the converter. A DC link reactor is integrated in frame sizes FSD to FSF, and therefore no line reactor is required.

Recommended line-side overcurrent protection devices

Overcurrent protection devices are absolutely necessary for the operation of the converters. The table listed in the section “Recommended line-side overcurrent protection devices” provides recommendations according to IEC and UL regulations, depending on the area of application. Recommendations on further overcurrent protection devices are available at:

More information about the listed Siemens fuses is available in Catalog LV 10 as well as in the Industry Mall.

DC link components

Braking resistors

Excess energy in the DC link is dissipated in the braking resistor. The braking resistors are designed for use with the SINAMICS G120C. This has an integrated braking chopper (electronic switch). For the electromagnetically compatible connection of an optionally connectable braking resistor, the corresponding shield connection kit is to be ordered for frame sizes FSD to FSF.

Load-side power components

Output reactors

Output reactors reduce the rate of voltage rise (dv/dt) and the height of the current peaks, and enable longer motor cables to be connected.

Supplementary system components

IOP‑2 Intelligent Operator Panel

Graphics-based, user-friendly and powerful operator panel for commissioning and diagnostics as well as local operator control and monitoring of SINAMICS G120C.

BOP‑2 Basic Operator Panel

A 2-line display to provide support when commissioning and troubleshooting the drive. The drive can be locally controlled.

Memory card

The parameter settings for a converter can be stored on the SINAMICS SD memory card. When service is required, e.g. after the converter has been replaced and the data have been downloaded from the memory card, the drive system is immediately ready for use again. The associated memory card holder is integrated in the converter.

SINAMICS G120 Smart Access

Wireless commissioning, operation and diagnostics via mobile device or laptop thanks to the optional web server module SINAMICS G120 Smart Access enabling user-friendly operation and easy access to the converter, even if this is installed in areas difficult to access.

SINAMICS CONNECT 300 IoT Gateway

Connection to the Cloud MindSphere with the optionally available SINAMICS CONNECT 300 IoT Gateway.

PC converter connection kit 2

For controlling and commissioning a converter directly from a PC if the STARTER commissioning tool or SINAMICS Startdrive has been installed on the PC.

Shield connection kits

A shield connection kit is included in the scope of delivery for frame sizes FSAA to FSC.
A set of shield plates is included in the scope of delivery for the motor and signal cables corresponding to the frame size for the frame sizes FSD to FSF. For the electromagnetically compatible connection of an optionally connectable braking resistor, the corresponding shield connection kit is to be ordered for frame sizes FSD to FSF.

Additional options

Further selected accessories are available from “Siemens Product Partner for Drives Options”:

Spare parts

Shield connection kits

A shield connection kit is supplied as standard with frame sizes FSAA to FSC. These shield connection kits can also be ordered as spare parts.
A set of shield plates is included in the scope of delivery for the motor and signal cables corresponding to the frame size for the frame sizes FSD to FSF. For the electromagnetically compatible connection of an optionally connectable braking resistor, the corresponding shield connection kit is to be ordered for frame sizes FSD to FSF.

Spare parts kit

This kit comprises four I/O terminals, one RS485 terminal, two pairs of Control Unit doors (1 × PN and 1 × other communication versions) and one blanking cover.

Set of connectors

A set of connectors for the line feeder cable, braking resistor and motor cable can be ordered corresponding to the frame size of the SINAMICS G120C converter.

Roof-mounted fan

A roof-mounted fan (at the top of the device) comprising a pre-assembled unit with holder and fan can be ordered corresponding to the frame size of the SINAMICS G120C.

Fan unit

A replacement fan (at the rear of the device; heat sink) comprising a pre-assembled unit with holder and fan can be ordered corresponding to the frame size of the SINAMICS G120C.

Connection example for SINAMICS G120C

USS/Modbus RTU communication interface

PROFIBUS DP communication interface

PROFINET, EtherNet/IP communication interface

Available optional power and DC link components

The following line-side components, DC link components and load-side power components are optionally available in the appropriate frames sizes:

U = Base component

S = Lateral mounting

I = Integrated

F = Converter available with and without integrated filter class A

– = Not possible

¹⁾ Line reactors, braking resistors and output reactors that are suitable for base mounting are also available for SINAMICS G120C, frame size FSAA, 0.55 kW to 2.2 kW. For 2.2 kW, operation of the line reactor, braking resistor and output reactor that are suitable for base mounting is only permitted for operating the converter with rated power of 1.5 kW based on high overload (HO).
More information is available in the operating instructions on the Internet at:

Maximum permissible cable lengths from the motor to the converter when using output reactors or line filters

The following load-side power components are optionally available in the appropriate frame sizes and result in the following maximum cable lengths, if necessary in combination with line filters for complying with EMC requirements:

¹⁾ For SINAMICS G120C frame size FSAA 2.2 kW with low-capacitance CY cable 150 m (492 ft) (shielded) – otherwise 125 m (410 ft) (shielded).

²⁾ With low-capacitance CY cable 50 m (164 ft) (shielded).

³⁾ With low-capacitance CY cable 100 m (328 ft) (shielded).

⁴⁾ For frame sizes FSD to FSF the maximum permissible cable lengths are not increased with an output reactor. By means of the output reactor, the loading of the motor windings is reduced by lower rates of voltage rise (dv/dt). By means of two output reactors connected in series, the maximum permissible cable lengths for frame sizes FSD and FSE are increased to 350 m (1148 ft) (shielded) and 525 m (1723 ft) (unshielded), and for frame size FSF to 525 m (1723 ft) (shielded) and 800 m (2625 ft) (unshielded).

⁵⁾ More information is available in the operating instructions on the Internet at:

The following electronic configuring aids and engineering tools are available for SINAMICS G120C compact converters:

Drive Technology Configurator (DT Configurator)

The Drive Technology Configurator (DT Configurator) helps you to configure the optimum drive technology products for a number of applications – starting with gear units, motors, converters as well as the associated options and components and ending with controllers, software licenses and connection systems.

The DT Configurator can be used on the internet without requiring any installation. The DT Configurator can be found in the Siemens Industry Mall at the following address:

SIZER for Siemens Drives engineering tool

The SIZER for Siemens Drives engineering tool makes it easy to configure the SINAMICS converter family. It provides support when selecting the hardware and firmware components necessary to implement a drive task. SIZER for Siemens Drives is designed to support configuring of the entire drive system.

You can find further information on the SIZER for Siemens Drives engineering tool in the Engineering tools section.

The SIZER for Siemens Drives engineering tool is available free on the internet at:

STARTER commissioning tool

The STARTER commissioning tool allows menu-prompted commissioning, optimization and diagnostics. Apart from the SINAMICS drives, STARTER is also suitable for MICROMASTER 4 devices.

You can find further information on the STARTER commissioning tool in the Engineering tools section.

More information about the STARTER commissioning tool is available on the internet at

SINAMICS Startdrive commissioning tool

SINAMICS Startdrive is a tool for configuring, commissioning, and diagnosing the SINAMICS family of converters and is integrated into the TIA Portal. SINAMICS Startdrive can be used to implement drive tasks with the SINAMICS G110M, SINAMICS G120, SINAMICS G120C, SINAMICS G120D and SINAMICS G120P converter series. The commissioning tool has been optimized with regard to user friendliness and consistent use of the TIA Portal benefits of a common working environment for PLC, HMI and drives.

You can find further information on the SINAMICS Startdrive commissioning tool in the Engineering tools section.

The SINAMICS Startdrive commissioning tool is available free on the internet at:

Drive ES engineering system

Drive ES is the engineering system that can be used to integrate the communication, configuration and data management functions of Siemens drive technology into the SIMATIC automation world easily, efficiently and cost-effectively. Two software packages are available for SINAMICS – Drive ES Basic Maintenance and Drive ES PCS.

You can find further information on the Drive ES engineering system in the Engineering tools section.

More information about the Drive ES engineering system is available on the internet at

Unless explicitly specified otherwise, the following technical specifications are valid for all SINAMICS G120C compact converters.

¹⁾ In product packaging.

²⁾ More information is available in the operating instructions on the Internet at:

³⁾ Non-filtered devices are designed for operation in IT systems or in conjunction with an RCD. The customer must provide suitable RI suppression equipment to ensure that these devices comply with the limits defined for Category C3 or C2.

⁴⁾ Max. permissible cable lengths see Technical specifications for power electronics.

⁵⁾ SINAMICS G120C compact converters, frame size FSB, with PROFINET interface (Article No.: 6SL3210-1KE21-.AF1) additionally require a line reactor.

¹⁾ Applies to industrial control panel installations to NEC Article 409 or UL 508A.

¹⁾ The rated output current I_rated can be used up to 100 %; however, without overload.

²⁾ The base-load current I_L is based on the duty cycle for low overload (LO).

³⁾ The base-load current I_H is based on the duty cycle for high overload (HO).

⁴⁾ Typical values. More information can be found on the Internet at

⁵⁾ The rated input currents are valid for an input voltage of 400 V 3 AC and a line impedance corresponding to u_K = 1 % (without line reactor). The rated input current based on I_L is stamped on the converter rating plate. In the particular application, the input current depends on the motor load and line impedance. The input current is reduced when using a line reactor.

⁶⁾ The maximum motor cable lengths are valid for an input voltage of 400 V 3 AC and operation with a 4 kHz pulse frequency. When a converter with an integrated line filter class A is used to comply with the limits of EN 61800-3 Category C2 for line-conducted interference emission, the maximum permissible motor cable length is 25 m (shielded) as standard – and 50 m with low-capacitance CY cable (shielded).

¹⁾ The rated output current I_rated can be used up to 100 %; however, without overload.

²⁾ The base-load current I_L is based on the duty cycle for low overload (LO).

³⁾ The base-load current I_H is based on the duty cycle for high overload (HO).

⁴⁾ Typical values. More information can be found on the Internet at

⁵⁾ The rated input currents are valid for an input voltage of 400 V 3 AC and a line impedance corresponding to u_K = 1 % (without line reactor). The rated input current based on I_L is stamped on the converter rating plate. In the particular application, the input current depends on the motor load and line impedance. The input current is reduced when using a line reactor.

⁶⁾ The maximum motor cable lengths are valid for an input voltage of 400 V 3 AC and operation with a 4 kHz pulse frequency. When a converter with an integrated line filter class A is used to comply with the limits of EN 61800‑3 Category C2 for line-conducted interference emissions, the maximum permissible motor cable length is 25 m (shielded) as standard – for frame sizes FSAA to FSB with low-capacitance CY cable (shielded) it is 50 m.

⁷⁾ With low-capacitance CY cable 150 m (shielded).

¹⁾ The rated output current I_rated can be used up to 100 %; however, without overload.

²⁾ The base-load current I_L is based on the duty cycle for low overload (LO).

³⁾ The base-load current I_H is based on the duty cycle for high overload (HO).

⁴⁾ Typical values. More information can be found on the Internet at

⁵⁾ The rated input currents are valid for an input voltage of 400 V 3 AC and a line impedance corresponding to u_K = 1 % (without line reactor). The rated input current based on I_L is stamped on the converter rating plate. In the particular application, the input current depends on the motor load and line impedance. The input current is reduced when using a line reactor.

⁶⁾ The maximum motor cable lengths are valid for an input voltage of 400 V 3 AC and operation with a 4 kHz pulse frequency. When a converter with an integrated line filter class A is used to comply with the limits of EN 61800‑3 Category C2 for line-conducted interference emission, the maximum permissible motor cable length is 25 m (shielded) as standard – with low-capacitance CY cable for frame size FSB 50 m (shielded), for FSC 100 m (shielded).

¹⁾ The rated output current I_rated can be used up to 100 %; however, without overload.

²⁾ The base-load current I_L is based on the duty cycle for low overload (LO).

³⁾ The base-load current I_H is based on the duty cycle for high overload (HO).

⁴⁾ Typical values. More information can be found on the Internet at

⁵⁾ The rated input currents are valid for an input voltage of 400 V 3 AC and a line impedance corresponding to u_K = 1 %. The rated input current based on I_L is stamped on the converter rating plate. In the particular application, the input current depends on the motor load and line impedance.

⁶⁾ The maximum motor cable lengths are valid for an input voltage of 400 V 3 AC and operation with a 4 kHz pulse frequency. When a converter with an integrated line filter class A is used to comply with the limits of EN 61800‑3 Category C2 for line-conducted interference emissions, the maximum permissible motor cable length is 150 m (shielded) as standard.

¹⁾ The rated output current I_rated can be used up to 100 %; however, without overload.

²⁾ The base-load current I_L is based on the duty cycle for low overload (LO).

³⁾ The base-load current I_H is based on the duty cycle for high overload (HO).

⁴⁾ Typical values. More information can be found on the Internet at

⁵⁾ The rated input currents are valid for an input voltage of 400 V 3 AC and a line impedance corresponding to u_K = 1 %. The rated input current based on I_L is stamped on the converter rating plate. In the particular application, the input current depends on the motor load and line impedance.

⁶⁾ The maximum motor cable lengths are valid for an input voltage of 400 V 3 AC and operation with a 4 kHz pulse frequency. When a converter with an integrated line filter class A is used to comply with the limits of EN 61800‑3 Category C2 for line-conducted interference emissions, the maximum permissible motor cable length is 150 m (shielded) as standard.

Derating data

Pulse frequency

The permissible motor cable length depends on the cable type and the pulse frequency.

Ambient temperature

Permissible output current as a function of the ambient temperature, frame sizes FSAA to FSC

Permissible output current as a function of the ambient temperature, frame sizes FSD to FSF

For the frame sizes FSA to FSC, the PROFINET version can be butt-mounted at temperatures up to 55 °C.
The frame sizes FSAA and FSD to FSF can be butt-mounted at temperatures up to 50 °C.

Installation altitude

Permissible line supplies as a function of the installation altitude

• Installation altitude up to 2000 m (6562 ft) above sea level
  • Connection to every supply system permitted for the converter
• Installation altitudes between 2000 m (6562 ft) and 4000 m (13124 ft) above sea level
  • Connection only to a TN system with grounded neutral point
  • TN systems with grounded line conductor are not permitted
  • The TN line system with grounded neutral point can also be supplied using an isolation transformer
  • The phase-to-phase voltage does not have to be reduced

The connected motors, power elements and components must be considered separately.

Permissible output current as a function of the installation altitude, frame sizes FSAA to FSF at 40 °C for low overload (LO)

Current/power derating as a function of the line voltage

The SINAMICS G120C compact converter supplies a constant power in the line voltage range 380 V to 480 V 3 AC. The constant power results in current derating as a function of the line voltage.

Current derating as a function of the line voltage

More information on the derating data of the SINAMICS G120C compact converter can be found in the operating instructions on the Internet at:

SINAMICS G120C, frame size FSAA

Mounted with 2 M4 bolts, 2 M4 nuts, 2 M4 washers.

When the shield plate is mounted, the drilling pattern is compatible with frame size FSA.

Ventilation clearance required at the top: 80 mm (3.15 inches).
Ventilation clearance required at the bottom: 100 mm (3.94 inches).
Ventilation clearance required at the side: 0 mm (0 inches).

When the BOP‑2/IOP‑2 is plugged on, the overall depth increases by 11 mm (0.43 inches).

All dimensions in mm (values in brackets are in inches).

SINAMICS G120C, frame size FSA

Mounted with 3 M4 bolts, 3 M4 nuts, 3 M4 washers.

Ventilation clearance required at the top: 80 mm (3.15 inches).
Ventilation clearance required at the bottom: 100 mm (3.94 inches).
Ventilation clearance required at the side: 0 mm (0 inches).

When the BOP‑2/IOP‑2 is plugged on, the overall depth increases by 11 mm (0.43 inches).

All dimensions in mm (values in brackets are in inches).

SINAMICS G120C, frame size FSB

Mounted with 4 M4 bolts, 4 M4 nuts, 4 M4 washers.

Ventilation clearance required at the top: 80 mm (3.15 inches).
Ventilation clearance required at the bottom: 100 mm (3.94 inches).
Ventilation clearance required at the side: 0 mm (0 inches).

When the BOP‑2/IOP‑2 is plugged on, the overall depth increases by 11 mm (0.43 inches).

All dimensions in mm (values in brackets are in inches).

SINAMICS G120C, frame size FSC

Mounted with 4 M5 bolts, 4 M5 nuts, 4 M5 washers.

Ventilation clearance required at the top: 80 mm (3.15 inches).
Ventilation clearance required at the bottom: 100 mm (3.94 inches).
Ventilation clearance required at the side: 0 mm (0 inches).

When the BOP‑2/IOP‑2 is plugged on, the overall depth increases by 11 mm (0.43 inches).

All dimensions in mm (values in brackets are in inches).

SINAMICS G120C frame sizes FSD to FSF

When the BOP‑2/IOP‑2 is plugged on, the overall depth increases by 11 mm (0.43 inches).

A hard copy of the Compact Operating Instructions is supplied in English and German for SINAMICS G120C. Further documentation, such as Operating Instructions and List Manuals, is available for download free of charge from the Internet at:

Detailed information on SINAMICS G120C, the latest technical documentation (brochures, tutorials, dimensional drawings, certificates, manuals and operating instructions) is available on the Internet at:

In addition, the Drive Technology Configurator (DT Configurator) can be used on the Internet. The DT Configurator can be found in the Siemens Industry Mall at the following address:

Furthermore, the SINAMICS SELECTOR app is a practical tool that helps you find article numbers for SINAMICS V20, SINAMICS G120C, SINAMICS G120P, SINAMICS G120X (available soon), and SINAMICS G120 converters in the output range from 0.12 kW to 630 kW quickly and easily. You will find the free downloads for Android and for iOS at the following link: