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2 Year Warranty on ALL products
Do You Still Use MICROMASTER 440 Drives? Here’s Why It’s Time to Upgrade
If you’re still running MICROMASTER 440 drives in your facility, you’re not alone. These workhorse VFDs were once Siemens' go-to for advanced motor control—and they earned their reputation. But in 2025, relying on discontinued drives could put your operations at risk.
From sourcing replacement parts to meeting modern efficiency standards, upgrading from the MICROMASTER 440 isn’t just a good idea—it’s a necessary step toward reliability and performance.
Why Was the MICROMASTER 440 So Popular?
The MICROMASTER 440 (MM440) was widely adopted for its flexibility and fast response time. With features like vector control, braking chopper integration, and optional PROFIBUS modules, it served across industries like:
- Conveyor and material handling
- Centrifugal pumps and fans
- Packaging and printing machinery
- OEM skid systems and HVAC
From the manual: The MM440 offered precise motor control with up to 650 parameters, integrated safety inputs, and support for both open- and closed-loop applications.
What’s the Current Status of the MICROMASTER 440?
- 📅 Discontinued by Siemens: The product has officially reached end-of-life status.
- 🧩 Limited availability: New units are nearly impossible to source.
- ⚠️ Increasing repair costs: Fewer specialists offer reliable MM440 repairs.
- ❌ No firmware updates: Meaning no cybersecurity patches or enhancements.
If your drive fails, replacement time could stretch into days or weeks. And in a 24/7 production environment, that can translate to thousands in losses.
Top 5 Reasons to Upgrade Now
1. Reduced Downtime Risk
Upgrading ensures you’re not caught off guard by sudden MM440 failure with no replacement in sight.
2. Better Energy Efficiency
Modern drives like the SINAMICS G120 offer higher efficiency, adaptive motor tuning, and energy optimization features.
3. Improved Safety Features
Newer drives integrate STO (Safe Torque Off), SIL-rated safety protocols, and support advanced protective logic—without external wiring complexity.
4. TIA Portal Integration
G120 drives can be configured and monitored through Siemens’ TIA Portal, giving your team unified access to PLCs, HMIs, and drives.
5. More Compact and Scalable
The G120's modular design means you can scale your system’s power, I/O, and communication with fewer parts and faster installation.
Replacement Recommendation: Upgrade to SINAMICS G120
For most MM440 applications, the SINAMICS G120 series is the ideal upgrade path. It's designed with modularity in mind, offering:
- Power Modules (PM240-2, PM250, etc.) from 0.55 kW to 250 kW
- Control Units (CU240E-2 PN, CU250S-2) for different communication and I/O needs
- IOP and BOP operator panels for on-site diagnostics
| MM440 Feature | SINAMICS G120 Equivalent |
|---|---|
| Integrated braking chopper | PM250 module |
| PROFIBUS / PROFINET | CU240E-2 PN or CU250S-2 options |
| Vector control | Advanced vector + servo modes |
| 0.12–250 kW range | Matches or exceeds power range |
Example: Replace a 6SE6440-2UD33-5FA1 MM440 with a 6SL3210-1PE33-5UL0 + CU240E-2 PN for a drop-in upgrade.
Upgrade Without Rewiring Everything
The good news? Many G120 drives match or closely align with MM440 terminal layouts. Siemens even provides migration guidelines to:
- Convert parameter sets
- Adapt existing wiring
- Ensure mechanical compatibility in panels
Tip: Siemens offers Startdrive and migration tools within TIA Portal to assist with this process.
Still Need MM440 Parts? We’ve Got You Covered.
At Industrial Automation Co., we still carry many in-stock MM440 drives and modules for urgent replacements:
- 6SE6440-2UD33-5FA1 – MICROMASTER 440, 3.5 kW
- 6SE6440-2UD27-5FA1 – MICROMASTER 440, 7.5 kW
- 6SE6440-2UD21-1BA1 – MM440, 1.1 kW
- 6SE6400-0BE00-0AA0 – BOP Panel
Need Help Choosing the Right Replacement?
We’ve helped dozens of manufacturers replace or upgrade their MM440 drives. Whether you need a form-fit replacement or a full modernization path, our team can help with:
- Fast part matching
- Application-specific drive recommendations
- Same-day shipping for in-stock replacements