Siemens 6SE6420-2UD21-5AA1 MICROMASTER 420 MM420 1.5kW 3 Phase 380V AC Variable Frequency Drive VFD Inverter
1. Product Overview
The 6SE6420-2UD21-5AA1 belongs to Siemens MICROMASTER 420 (MM420) series compact variable frequency drive, an unfiltered 3-phase AC inverter specially designed for standard AC motor speed control. Adopting advanced IGBT microprocessor control technology, it features modular structure, easy commissioning, stable operation and strong anti-interference performance, widely used in general industrial automation equipment for fans, pumps, conveyors and small machine tools.
This model supports constant torque & variable torque load, built-in RS485 communication interface, flexible I/O configuration, and multiple protection functions to guarantee long-term stable operation under standard industrial environments.
2. Core Technical Specifications
| Item |
Parameter |
| Brand |
Siemens |
| Part Number |
6SE6420-2UD21-5AA1 |
| Series |
MICROMASTER 420 (MM420) |
| Rated Power |
1.5 kW (2 HP) |
| Input Power |
3 AC 380–480V ±10%, 47–63Hz |
| Rated Input Current |
5.9 A |
| Rated Output Current |
4.0 A |
| Output Frequency Range |
0–650 Hz |
| Overload Capacity |
150% rated current for 60s within 300s cycle |
| Enclosure Protection Grade |
IP20 |
| Frame Size |
FSA |
| Dimensions (H × W × D) |
173 mm × 73 mm × 149 mm |
| Net Weight |
1.3 kg |
| Gross Packing Weight |
1.8 kg |
| Ambient Operating Temp |
-10℃ ~ +50℃ |
| Cooling Mode |
Forced Air Cooling |
| Built-in Filter |
No Filter (Unfiltered Type) |
| Standard I/O Port |
3 Digital Inputs, 1 Analog Input, 1 Relay Output, 1 Analog Output |
| Communication Interface |
Standard RS485, Optional PROFIBUS-DP Module |
| Optional Panel |
BOP/AOP Operator Panel (Not Included Standard) |
3. Key Features & Advantages
- Compact Modular Design: Small footprint, wall-mounted or cabinet-mounted installation saves control cabinet space.
- Multiple V/F Control Modes: Linear V/F, square V/F and multi-point programmable V/F control, suitable for fan, pump and transmission loads separately.
- FCC Flux Current Control: Optimizes motor dynamic response, stable low-speed torque output.
- Rich Built-in Protection: Overvoltage, undervoltage, overcurrent, overload, overheat, motor short-circuit, earth fault protection to avoid equipment damage.
- Flexible Communication Expansion: RS485 standard interface supports MODBUS protocol; optional DP module connects to Siemens PLC control system.
- Easy Parameter Debugging: Factory default parameters support quick startup; optional BOP panel for local parameter setting & status monitoring.
- High Energy Efficiency: Optimized switching frequency reduces motor noise, up to 96% conversion efficiency.
4. Wide Application Fields
HVAC industry: Centrifugal fans, water supply pumps, exhaust fans
Logistics equipment: Belt conveyors, roller conveyors, small lifting machines
Light machinery: Packaging machines, textile equipment, small woodworking machine tools
Water treatment: Circulation pumps, dosing pumps
General automation: Auxiliary motor speed regulation
5. Supply & After-sales Information
Product Condition: Brand New Original Siemens Authentic Product
Minimum Order Quantity: 1 Piece
Stock Availability: In Stock, Fast Shipment Within 1–3 Working Days
Warranty Period: 12 Months Factory Warranty
Packing: Original Siemens Neutral Carton with Anti-collision Foam, Complete Datasheet Manual Inside
Shipping Support: Sea Freight / Air Freight / Express (DHL, FedEx, UPS)
6. Model Code Explanation
6SE6420-2UD21-5AA1
- 6SE6420: MM420 series inverter
- 2UD: 3-phase 380–480V input, unfiltered
- 21-5: Rated power 1.5kW
- AA1: Standard version without built-in filter, no operator panel
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