Siemens 6SE6440-2UD27-5CA1 MICROMASTER 440 Variable Frequency Drive | Replacement, Equivalent & Selection Guide
The Siemens 6SE6440-2UD27-5CA1 is a high-performance AC variable frequency drive from the MICROMASTER 440 (MM440) series, rated at 7.5 kW (10 HP) for three-phase 380–480 V applications. Engineered for demanding industrial motor control, it delivers precise speed regulation, built-in PID control, and comprehensive protection functions. At Konmask.com, we supply genuine and compatible units with full traceability — ideal for OEM replacement, system upgrades, and new installations.
Technical Specifications
- Part Number: 6SE6440-2UD27-5CA1
- Series: MICROMASTER 440 (MM440)
- Rated Output Power: 7.5 kW (10 HP)
- Input Voltage: 3-Phase AC 380 – 480 V (±10%)
- Output Voltage: 3-Phase AC 0 – 480 V
- Output Current (rated): 18.4 A
- Output Frequency Range: 0 – 650 Hz
- Control Method: V/f, Sensorless Vector (FVC), Closed-Loop Vector
- Protection Rating: IP20
- Overload Capacity: 150% for 60 s / 200% for 3 s
- Communication: USS protocol (RS-485); optional PROFIBUS, DeviceNet via CB
- Braking: DC braking, compound braking; optional dynamic braking resistor
- Ambient Temperature: -10 °C to +50 °C (derate above 40 °C)
- Weight: approx. 5.5 kg
- Dimensions (H×W×D): 275 × 185 × 195 mm
- Standards: CE, UL, cUL, C-Tick
Compatible Replacement & Equivalent Models
The table below lists direct replacements and functional equivalents for the 6SE6440-2UD27-5CA1. Always verify voltage class, current rating, and control mode before substituting.
| Part Number | Brand | Power | Voltage | Notes |
|---|---|---|---|---|
| 6SE6440-2UD27-5CA1 | Siemens | 7.5 kW | 3Ph 380–480 V | Original / This unit |
| 6SE6440-2UD27-5CB1 | Siemens | 7.5 kW | 3Ph 380–480 V | Successor with enhanced EMC filter |
| 6SL3210-1KE21-3AF1 | Siemens | 7.5 kW | 3Ph 380–480 V | G120C series — modern replacement |
| ACS550-01-017A-4 | ABB | 7.5 kW | 3Ph 380–480 V | Cross-brand equivalent |
| FR-E740-7.5K | Mitsubishi | 7.5 kW | 3Ph 380–480 V | Cross-brand equivalent |
| CIMR-AB4A0018FAA | Yaskawa | 7.5 kW | 3Ph 380–480 V | A1000 series equivalent |
| PowerFlex 40 22B-D017N104 | Allen-Bradley | 7.5 kW | 3Ph 380–480 V | Cross-brand equivalent |
Need a specific equivalent not listed? Contact us at support@konmask.com — our engineers will confirm compatibility.
Why Choose the Original Model
- Proven reliability: MM440 has millions of installed units globally across 20+ years of field operation.
- Advanced vector control: Sensorless flux vector control delivers ±0.5% speed accuracy without encoder feedback.
- Wide frequency output: 0–650 Hz output supports high-speed spindle and specialized motor applications.
- Comprehensive I/O: 6 digital inputs, 2 analog inputs, 3 digital outputs, 2 analog outputs — no expansion needed for most applications.
- Integrated PID controller: Eliminates external process controllers for pump, fan, and HVAC loops.
- Extensive protection: Overcurrent, overvoltage, undervoltage, overtemperature, ground fault, and stall protection built-in.
- Siemens ecosystem: Seamless integration with SIMATIC S7 PLCs, PROFIBUS, and TIA Portal engineering.
Typical Applications
- Pump and fan speed control (HVAC, water treatment, building automation)
- Conveyor and material handling systems
- Compressor and blower control
- Machine tool spindle drives
- Textile and printing machinery
- Packaging and food processing lines
- Crane and hoist applications (with appropriate braking option)
System Compatibility
- PLC Integration: Siemens S7-200, S7-300, S7-400, S7-1200, S7-1500 via USS/PROFIBUS
- HMI: Compatible with SIMATIC HMI panels via PROFIBUS DP or USS
- Fieldbus Options: PROFIBUS DP (CB15), DeviceNet (CB11), CANopen (CB21) via optional comms board
- Motor Types: Standard induction motors (IEC/NEMA), permanent magnet motors (with parameter tuning)
- Braking Resistor: External dynamic braking resistor for high-inertia loads
- EMC Filter: Internal Class A filter; external Class B filter available for sensitive environments
Selection Guide
Use the following criteria to confirm the 6SE6440-2UD27-5CA1 is the right drive for your application, or to select an appropriate alternative:
- Step 1 – Power matching: Confirm motor rated power ≤ 7.5 kW and rated current ≤ 18.4 A.
- Step 2 – Voltage class: Confirm supply is 3-phase 380–480 V AC. For 200–240 V systems, select the 2UD series instead.
- Step 3 – Control mode: V/f for simple pump/fan; sensorless vector for conveyors; closed-loop vector for servo-like precision.
- Step 4 – Protection rating: IP20 suits panel-mounted installations. For harsh environments, consider IP54/IP55 enclosure or a protected variant.
- Step 5 – Communication: If PROFIBUS is required, add CB15 comms board. For USS only, no additional hardware needed.
- Step 6 – Overload duty: Standard duty (110% / 60 s) for pumps/fans; heavy duty (150% / 60 s) for conveyors/hoists — MM440 meets heavy duty by default.
Not sure which model fits? Send your motor nameplate data and application details to support@konmask.com for a free selection recommendation.
Quality Assurance & Sourcing
- All units sourced from authorized Siemens distribution channels or verified surplus with full traceability documentation.
- Pre-shipment inspection: visual check, label verification, and functional power-on test where applicable.
- Anti-counterfeit measures: hologram label verification, serial number cross-check against Siemens database.
- Packaging: original or equivalent ESD-safe packaging with desiccant for long-term storage protection.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
How to Order
- Online: Add to cart directly on this page — stock availability shown in real time.
- Email RFQ: support@konmask.com — include part number, quantity, and required delivery date.
- Phone/WhatsApp: +0086 19859288691 — available Monday–Friday, 09:00–18:00 CST.
- Bulk / OEM orders: Volume pricing available for orders of 5+ units. Request a formal quotation via email.
- Lead time: In-stock orders ship within 1–3 business days. Ex-stock lead time quoted on request.
Replacement & Compatibility FAQ
Q: Is the 6SE6440-2UD27-5CA1 still in production?
A: The MM440 series has been superseded by the SINAMICS G120 family. However, genuine MM440 units remain available as new-old-stock and refurbished. The G120C (6SL3210-1KE21-3AF1) is the recommended modern replacement.
Q: Can I replace my MM440 with a SINAMICS G120 directly?
A: Mechanically and electrically yes, but parameter migration is required. Siemens provides a migration guide. Contact us for assistance.
Q: What is the difference between 6SE6440-2UD27-5CA1 and 6SE6440-2UD27-5CB1?
A: The CB1 suffix indicates an enhanced built-in EMC filter (Class B). Functionally identical otherwise.
Q: Does this drive support encoder feedback for closed-loop control?
A: Yes, via the optional encoder module (6SE6400-1PB00-0AA0) connected to the drive’s pulse encoder interface.
Q: What motor cable length is supported without output filter?
A: Up to 50 m shielded / 100 m unshielded. For longer cables, an output reactor (dU/dt filter) is recommended.
Q: Can I use this drive with a single-phase input?
A: No. The 6SE6440-2UD27-5CA1 requires 3-phase input. For single-phase supply, select the MM420 or MM430 series.
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