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Siemens MICROMASTER MM750/3 Variable Frequency Drive

Siemens MICROMASTER MM750/3 Variable Frequency Drive (VFD)

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ManufacturerSiemens

Part number6SE9221-5DC40

Part Number 6SE9221-5DC40

Manufacturer Siemens

Series MICROMASTER MM750/3

Power Rating 7.5 kW (Constant Torque)

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7.5 kW constant torque rating 380-500V AC, 3-phase input IP20 protection 150% overload capacity Suitable for variable speed motor control MICROMASTER series reliability

Product description

The Siemens 6SE9221-5DC40 is a MICROMASTER MM750/3 variable frequency drive (VFD) designed for motor control applications. This unit is rated for a 7.5 kW constant torque load and operates on a 3-phase, 380-500V AC input with +/-10% tolerance at 50/60 Hz. It features overload capability of 150% for 60 seconds and has a protection rating of IP20, with dimensions of 215 x 185 x 195 mm (H x W x D). The ambient operating temperature range is 0-50°C.

This VFD is suitable for a wide range of industrial applications requiring precise speed control for three-phase AC motors. Common uses include pumps, fans, conveyors, mixers, and machine tools where variable speed operation can optimize energy consumption and process efficiency. Its robust construction ensures reliability in demanding industrial settings.

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Technical specifications

Part Number	6SE9221-5DC40
Manufacturer	Siemens
Series	MICROMASTER MM750/3
Power Rating	7.5 kW (Constant Torque)
Input Voltage	3AC 380-500V +/-10%
Frequency	50/60 Hz
Overload	150% for 60 sec
Dimensions	215 x 185 x 195 mm (H x W x D)
Protection	IP20
Ambient Temperature	0-50 °C

Common applications

Pumps

Fans

Conveyors

Mixers

Machine tools

HVAC systems

Industrial machinery

Compatible systems

3-phase AC induction motors Control systems requiring variable speed

Also known as

Siemens MM750/3 VFD MICROMASTER 7.5kW Drive 6SE9221-5DC40 motor controller

Replaces / compatible with

This VFD can replace older or existing motor control solutions, offering variable speed capabilities for AC induction motors within its power and voltage ratings.

Technical note

Expert tip

Ensure proper ventilation and adherence to IP20 enclosure guidelines when installing this drive, as it is sensitive to dust and moisture ingress.

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Frequently asked questions

What is the power rating and input voltage for the Siemens 6SE9221-5DC40 MICROMASTER drive?

The Siemens 6SE9221-5DC40 is rated for 7.5 kW (constant torque) and operates on a 3-phase AC input voltage of 380-500V, with a frequency range of 50/60 Hz.