Siemens 6SE6420-2UD21-5AA1 MICROMASTER 420 Variable Speed Drive | Replacement, Equivalent & Selection Guide
The Siemens 6SE6420-2UD21-5AA1 is a compact, high-performance AC variable speed drive from the MICROMASTER 420 series, rated at 1.5 kW (2 HP) for single-phase 200–240 V input applications. Designed for general-purpose motor control in industrial and commercial environments, it delivers precise speed regulation, energy savings, and robust protection features. Konmask.com supplies genuine and compatible units with full traceability.
Technical Specifications
- Part Number: 6SE6420-2UD21-5AA1
- Series: MICROMASTER 420 (MM420)
- Manufacturer: Siemens AG
- Output Power: 1.5 kW (2 HP)
- Input Voltage: 1-phase 200–240 V AC (±10%)
- Output Voltage: 3-phase 0–240 V AC
- Input Frequency: 47–63 Hz
- Output Current (rated): 8.0 A
- Output Frequency Range: 0–650 Hz
- Control Method: V/f, Flux Current Control (FCC)
- Protection Rating: IP20
- Ambient Temperature: -10°C to +50°C (derating above 40°C)
- Weight: approx. 1.06 kg
- Communication: RS-485 (USS protocol); optional PROFIBUS via CB module
- Braking: DC injection braking; optional dynamic braking resistor
- Standards: CE, UL, cUL, C-Tick
Compatible Replacement & Equivalent Models
When the 6SE6420-2UD21-5AA1 is unavailable or requires a cost-effective alternative, the following models are commonly evaluated:
- Siemens 6SE6420-2UD22-2BA1 — MM420, 2.2 kW, 1-phase 200–240 V (next power step up; pin-compatible footprint)
- Siemens 6SE6420-2UC21-5AA1 — MM420, 1.5 kW, 3-phase 200–240 V (same power, 3-phase input variant)
- Siemens 6SL3210-5BB21-5UV1 — SINAMICS V20, 1.5 kW, 1-phase 200–240 V (next-generation replacement platform)
- ABB ACS355-01E-04A7-2 — 1.1 kW / 0.75 kW range; verify output current match before substitution
- Schneider Electric ATV312H075M2 — 0.75 kW, 1-phase 200–240 V; suitable for lighter-load equivalence
⚠ Always verify input voltage, output current, control wiring, and parameter compatibility before substituting any drive. Contact Konmask.com for a free compatibility check.
Why Choose the Original Model
- Proven reliability: MM420 series has millions of installed units globally across 20+ years of field operation.
- Parameter continuity: Existing P-parameter sets (P0304–P1800 range) transfer directly to replacement units without reprogramming.
- Spare parts ecosystem: Operator panels (BOP/AOP), filter modules, and braking resistors remain widely available.
- Certified compliance: CE / UL markings satisfy most regional regulatory requirements without additional testing.
- Siemens support: Full documentation, firmware, and technical support available via Siemens Industry Online Support (SIOS).
Typical Applications
- Pump and fan speed control in HVAC systems
- Conveyor and material handling drives
- Compressor soft-start and speed regulation
- Textile and packaging machinery
- Small centrifugal pump stations
- Laboratory and test bench motor control
System Compatibility
- PLC Integration: Compatible with Siemens S7-200, S7-300, S7-1200, S7-1500 via USS/PROFIBUS (with CB PROFIBUS module)
- HMI: Siemens SIMATIC HMI panels via RS-485 USS protocol
- Motor types: Standard 3-phase induction motors (IEC / NEMA frame)
- Input filter: Class A/B EMC filter modules available (6SE6400-2FA00-6AD0 and variants)
- Operator panels: BOP (Basic Operator Panel) 6SE6400-0BP00-0AA0; AOP (Advanced Operator Panel) 6SE6400-0AP00-0AA0
Selection Guide
Use the table below to select the correct MM420 variant for your application:
- Input phases: 2UD = 1-phase 200–240 V | 2UC = 3-phase 200–240 V | 2AD = 3-phase 380–480 V
- Power code: 21-5AA1 = 1.5 kW | 22-2BA1 = 2.2 kW | 23-0BA1 = 3.0 kW
- Key selection criteria: Motor rated current ≤ drive output current; input supply voltage and phase count; required output frequency range; ambient temperature and IP rating; communication protocol required
- Upgrade path: For new designs, consider SINAMICS V20 (6SL3210-5BB series) — same mounting footprint, improved energy efficiency, and extended support lifecycle.
Quality Assurance & Sourcing
- Units sourced from authorized Siemens distribution channels and verified surplus stock
- Each unit inspected for physical integrity, label authenticity, and firmware version prior to dispatch
- Serialized traceability records available on request
- 30-day return policy for unused, uninstalled units
- Warranty: 12 months from date of shipment (subject to terms)
How to Order
- Part Number: 6SE6420-2UD21-5AA1
- Add to cart directly on this page, or contact us for bulk pricing and lead time confirmation.
- Email: [email protected]
- Phone / WhatsApp: +0086 19859288691
- For OEM / project quantities (>5 units), request a formal quotation for best pricing.
Replacement & Compatibility FAQ
Q: Can the SINAMICS V20 6SL3210-5BB21-5UV1 directly replace the 6SE6420-2UD21-5AA1?
A: Yes, in most cases. The V20 offers the same 1.5 kW / 1-phase 200–240 V rating with a similar DIN-rail footprint. Parameter migration requires manual re-entry as the parameter set is not cross-compatible. Verify control terminal wiring before commissioning.
Q: Is the 6SE6420-2UD21-5AA1 still in production?
A: The MM420 series has reached end-of-production. Siemens recommends migration to SINAMICS V20 for new installations. Konmask.com maintains stock of genuine MM420 units for maintenance and replacement needs.
Q: What operator panel is compatible?
A: The BOP (6SE6400-0BP00-0AA0) and AOP (6SE6400-0AP00-0AA0) are both compatible. The drive ships without an operator panel by default.
Q: Can I use this drive with a 3-phase motor?
A: Yes. The drive accepts single-phase input and outputs 3-phase to the motor — this is the standard configuration for the 2UD variant.
Q: What is the maximum cable length to the motor?
A: Siemens recommends ≤ 25 m unscreened / ≤ 50 m screened cable without an output filter. Use an output reactor for longer runs.
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