Siemens 6SE6420-2UD21-1AA1
Siemens 6SE6420-2UD21-1AA1
Siemens 6SE6420-2UD21-1AA1
Siemens 6SE6420-2UD21-1AA1
Siemens 6SE6420-2UD21-1AA1
Siemens 6SE6420-2UD21-1AA1
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6SE6420-2UD21-1AA1

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The 6SE6420-2UD21-1AA1 is a Siemens MICROMASTER 420 frequency inverter with 1.1 kW (1.5 hp) output, 380-480V 3-phase input, IP20, and 150% overload for 60 seconds.
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Technical specifications for 6SE6420-2UD21-1AA1

  • Manufacturer:
    Siemens
  • Part Number:
    6SE6420-2UD21-1AA1
  • Product Family:
    Siemens SINAMICS
  • Product Type:
    Inverter
  • Input Phases:
    3 AC
  • Input Line Voltage:
    380...480V ±10%
  • Input Line Frequency:
    47...63 Hz
  • Rated Input Current (HO):
    4.90 A
  • Output Phases:
    3 AC
  • Output Rated Voltage:
    480V
  • Rated Output Power:
    1.10 kW (1.50 hp)
  • Rated Output Current (HO):
    3.00 A
  • Pulse Frequency:
    4000 Hz
  • Degree of Protection:
    IP20
  • Weight:
    1.05 kg
  • Estimated shipping dimensions:
    7.2x15x17.2cm
  • Tariff Code:
    8504409999
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Communication Safety and Compliance

Features:

  • Provides high starting torque and handles temporary load spikes without tripping; ideal for pumps, fans, and conveyors.
  • Accepts industrial three-phase mains globally; 1.1 kW (1.5 hp) output for small to medium motor control.
  • Small footprint, IP20 protection, lightweight (1.00 kg); includes 3 DI, 1 DO, 1 AI, 1 AO for basic I/O.
The 6SE6420-2UD21-1AA1 is designed to handle temporary high torque demands without interrupting operation. Its high overload (HO) rating allows the drive to deliver 150% of its rated output current (3.00 A × 150% = 4.50 A) for 60 seconds, followed by 100% output for 240 seconds within a 300-second cycle. This capability is critical for applications where the motor experiences intermittent peak loads.

The 6SE6420-2UD21-1AA1 is a three-phase input drive designed for global industrial mains. It accepts 380-480V AC ±10% at 47-63 Hz, covering the standard voltage ranges found in Europe (400V), the UK (415V), and many Asian countries (380V, 440V). This wide tolerance means the drive will operate reliably even when the mains voltage fluctuates due to grid conditions or large nearby loads switching on and off. The rated input current at high overload (HO) is 4.90 A. The drive’s output is three-phase AC at up to 480V, with a rated output current of 3.00 A at 1.10 kW (1.50 hp).

The 6SE6420-2UD21-1AA1 is a size FSA drive – the smallest frame size in the MICROMASTER 420 family. Its compact dimensions (73 mm wide, 173 mm high, 149 mm deep) and low weight (1.00 kg) make it easy to mount in crowded control cabinets. The IP20 protection rating means the drive is suitable for installation inside an enclosure, protecting it from dust and accidental contact. The narrow width (73 mm) is particularly valuable when multiple drives must be placed side by side. The drive’s terminals are accessible from the front, simplifying wiring. Mounting is typically on a DIN rail or directly onto a backplate.

The 6SE6420-2UD21-1AA1 Siemens Inverter may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

Siemens 6SE6420-2UD21-1AA1 Inverter Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
Siemens 6SE6420-2UD21-1AA1 Inverter Specs

General

  • Manufacturer Siemens
  • Model 6SE6420-2UD21-1AA1
  • Condition New Original ready stock
  • Product Family 6SE6420-2UD22-2BA1,6SE6420-2UD11-5AA1,6SE6420-2UD21-1BA1
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
  • Fluid Control: Used in small to medium-sized centrifugal pumps and industrial fans, utilizing frequency conversion technology to achieve energy savings.
  • Material Handling: Commonly used in conveyor systems, providing smooth start and stop functions and reducing mechanical wear.
  • General Machinery Manufacturing: Suitable for food packaging, textile machinery, woodworking machinery, and various small automated processing equipment.
  • Built-in Interface: Standard configuration includes one RS-485 interface, supporting the USS protocol (Siemens Universal Serial Protocol) for simple network control.
  • Communication Option Board: Via the top expansion slot.
  • PROFIBUS DP: Connects the inverter as a slave to S7-300/400 or TIA systems.
  • DeviceNet, CANopen: Supports integration with third-party control systems.
  • Electrical Protection: Equipped with overvoltage/undervoltage protection, inverter overheat protection, motor overheat protection (PTC input), and short-circuit and ground fault protection.
  • CE: Complies with the EU Low Voltage and Electromagnetic Compatibility (EMC) Directive.
  • UL/cUL: Certified to US and Canadian safety standards.
  • C-Tick: Complies with Australian and New Zealand EMC regulations.
Description
The 6SE6420-2UD21-1AA1 is a MICROMASTER 420 frequency inverter from Siemens. It is designed for controlling three-phase AC motors in industrial applications. The inverter accepts 380-480V AC, 3-phase input at 47-63 Hz. Rated output power is 1.10 kW (1.50 hp) with a rated output current of 3.00 A. 

When using the 6SE6420-2UD21-1AA1, engineers benefit from a high overload capability: 150% output current for 60 seconds, followed by 100% for 240 seconds in a 300-second cycle. This makes it suitable for applications with intermittent high torque demands such as pumps, fans, and conveyors. 

 The drive operates on a power factor λ derived from its rated data. The rated input current (HO – High Overload) is 4.90 A. The output rated voltage is 480V. The inverter is designed for V/f control with an output frequency range of 0-650 Hz.

For legacy MICROMASTER 420 system expansions or repairs, the 6SE6420-2UD21-1AA1 provides a reliable 1.1 kW drive solution. It is suitable for low-power motor control applications. The drive has been superseded by newer SINAMICS product families (e.g., G120), but remains available as a spare part. Always verify that the connected motor voltage and current ratings match the drive’s specifications. 
Alternative Names
6SE6420-2UD22-2BA1 6SE6420-2UD11-5AA1 6SE6420-2UD21-1BA1 6SE642O-2UD21-1AA1
Technical notes
The 6SE6420-2UD21-1AA1 uses V/f control (Voltage/Frequency) for motor speed regulation. This is a simple, robust control method suitable for pumps, fans, and conveyors where high dynamic performance is not required. The output frequency range is 0-650 Hz (limited to 550 Hz in production).
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Does the 6SE6420-2UD21-1AA1 handle short-term overloads?
Yes. The 6SE6420-2UD21-1AA1 provides 150% output current for 60 seconds, followed by 100% for 240 seconds in a 300-second cycle. This allows it to handle temporary high torque demands (e.g., motor starting, load spikes) without tripping.
What motor can I connect to the 6SE6420-2UD21-1AA1?
The 6SE6420-2UD21-1AA1 is rated for 1.10 kW (1.50 hp) three-phase AC motors at 380-480V. The drive uses V/f control with an output frequency of 0-550 Hz (limited). Always match the motor’s full load current to the drive’s rated output current of 3.00 A.
What input voltage does the 6SE6420-2UD21-1AA1 require?
The 6SE6420-2UD21-1AA1 accepts 380-480V AC, 3-phase ±10% at 47-63 Hz. It is designed for industrial mains supplies common in Europe, Asia, and other regions. Rated input current (HO) is 4.90 A. Do not connect single-phase input.

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