Siemens 6SE6420-2UD21-1AA1 MICROMASTER 420 VFD 0.12kW | Replacement, Equivalent & Selection Guide
The Siemens 6SE6420-2UD21-1AA1 is a compact single-phase input variable frequency drive (VFD) from the MICROMASTER 420 (MM420) series, rated at 0.12 kW with a 1AC 200–240 V supply. Designed for simple pump, fan, and conveyor applications, it delivers reliable speed control in a space-saving package. Konmask.com supplies genuine and compatible units with full traceability for MRO and OEM customers worldwide.
Technical Specifications
- Part Number: 6SE6420-2UD21-1AA1
- Series: MICROMASTER 420 (MM420)
- Rated Output Power: 0.12 kW (0.16 HP)
- Input Voltage: 1AC 200–240 V, ±10%
- Output Voltage: 3AC 0–240 V
- Input Frequency: 47–63 Hz
- Output Frequency Range: 0–650 Hz
- Rated Input Current: 1.4 A
- Rated Output Current: 0.9 A
- Protection Class: IP20
- Ambient Temperature: -10°C to +50°C
- Weight: approx. 1.3 kg
- Communication: USS protocol (RS-485 via optional module)
- Braking: DC braking, compound braking
- Standards: CE, UL, cUL
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or alternatives for the 6SE6420-2UD21-1AA1. Always verify electrical ratings and mechanical dimensions before substitution.
- Siemens 6SE6420-2UD22-5AA1 — MM420, 0.25 kW, 1AC 200–240 V (next power step-up, same series)
- Siemens 6SE6420-2UC11-2AA1 — MM420, 0.12 kW, 1AC 110 V (different input voltage variant)
- Siemens 6SL3210-5BB11-2UV1 — SINAMICS V20, 0.12 kW, 1AC 200–240 V (recommended next-gen replacement)
- Siemens 6SL3210-5BB12-5UV1 — SINAMICS V20, 0.25 kW, 1AC 200–240 V (uprated V20 alternative)
- ABB ACS355-01E-02A4-2 — 0.37 kW, 1AC 200–240 V (cross-brand equivalent)
- Schneider Electric ATV312H018M2 — 0.18 kW, 1AC 200–240 V (cross-brand equivalent)
Note: Cross-brand equivalents require parameter re-commissioning. Contact Konmask for application-specific guidance.
Why Choose the Original Model
- Proven reliability in the Siemens MICROMASTER 420 ecosystem with 20+ years of field history
- Direct drop-in replacement for existing MM420 installations — no rewiring required
- Native compatibility with Siemens BOP/AOP operator panels and PC tools (STARTER, DriveMonitor)
- Extensive parameter set (600+ parameters) for precise application tuning
- Supported by global Siemens service network and long-term spare parts availability
Typical Applications
- Small pumps and fans in HVAC systems
- Light conveyor and material handling equipment
- Compressors and mixers in food & beverage processing
- OEM machine tool spindle control
- Laboratory and test bench motor control
System Compatibility
- PLC Integration: Compatible with Siemens S7-200, S7-300, S7-1200 via USS / Modbus RTU
- Operator Panels: BOP (Basic Operator Panel), AOP (Advanced Operator Panel)
- Communication Modules: CB15 (PROFIBUS), CB11 (DeviceNet) — optional add-ons
- Motor Types: Standard 3-phase asynchronous induction motors
- Braking Resistors: External braking resistor connectable for dynamic braking
Selection Guide
Use the table below to select the correct MM420 variant for your application:
- 0.12 kW / 1AC 200–240 V: 6SE6420-2UD21-1AA1 ← This model
- 0.25 kW / 1AC 200–240 V: 6SE6420-2UD22-5AA1
- 0.37 kW / 1AC 200–240 V: 6SE6420-2UD23-7AA1
- 0.55 kW / 1AC 200–240 V: 6SE6420-2UD25-5AA1
- 0.75 kW / 1AC 200–240 V: 6SE6420-2UD27-5AA1
- 0.12 kW / 3AC 380–480 V: 6SE6420-2UD31-1AA1
Key selection criteria: motor rated power (kW), supply voltage (1AC vs 3AC), ambient temperature, required IP rating, and communication protocol.
Quality Assurance & Sourcing
- Units sourced from authorized Siemens distribution channels or certified secondary market suppliers
- Each unit inspected for physical integrity, label authenticity, and firmware version prior to dispatch
- Batch traceability records maintained for B2B customers upon request
- Packaging: original Siemens carton where available; anti-static protective packaging for all units
- Warranty: 12 months from date of shipment (subject to terms)
How to Order
- Part Number: 6SE6420-2UD21-1AA1
- MOQ: 1 unit (bulk pricing available for qty 5+)
- Lead Time: In-stock units ship within 1–3 business days; ex-stock orders within 7–14 days
- Payment: T/T, PayPal, credit card via Shopify Payments
- Export: DDP/DAP worldwide; export documentation (CO, packing list, commercial invoice) provided
- Contact: [email protected] | +0086 19859288691
Replacement & Compatibility FAQ
Q: Can the SINAMICS V20 6SL3210-5BB11-2UV1 directly replace the 6SE6420-2UD21-1AA1?
A: Yes, electrically compatible (same power/voltage class). However, parameter migration is required as V20 uses a different parameter structure. Physical dimensions differ — verify panel cutout before installation.
Q: Is the 6SE6420-2UD21-1AA1 still in production?
A: The MM420 series has been superseded by SINAMICS V20. Siemens continues to supply spare units; Konmask maintains stock for MRO and replacement needs.
Q: Can I use a 3-phase input version instead?
A: The 3AC equivalent is 6SE6420-2UD31-1AA1 (380–480 V). Ensure your supply matches before substituting.
Q: What motor power can this drive control?
A: Rated for 0.12 kW motors. Do not exceed the rated output current of 0.9 A to avoid drive protection trips.
Q: Does Konmask provide commissioning support?
A: Yes. Our technical team can assist with parameter setup, wiring diagrams, and integration guidance. Contact [email protected].
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Contact: [email protected] | +0086 19859288691
