Introduction – Frese actuator Siemens equivalent
When working with modern Building Management Systems (BMS), the Frese Optima Compact actuator stands out for its precision, compact design, and compatibility with pressure-independent control valves. However, due to market availability, lead times, or project specifications, engineers and procurement teams often seek direct Siemens alternatives.
In this post, we provide a detailed guide comparing two commonly used Frese actuators with their Siemens equivalents, including updated information on product obsolescence and new replacement models.
Frese Actuator Models – Specs Overview
| No | Frese Model | Thrust | Valve Size | Voltage | Control Signal | IP Rating | Model Ref |
|---|---|---|---|---|---|---|---|
| 1 | 53-1297 | 800 N | DN50–DN125 (Flanged) | 24V AC | 0–10V / 3-Position | IP54 | Type 02 |
| 2 | 53-1296 | 400 N | DN40–DN50 (Threaded) | 24V AC/DC | 0–10V / 3-Position | IP54 | Type 01 |
Siemens Equivalent Actuators
Due to the obsolescence of the Siemens SQX series, the SAX series is now the recommended alternative for most Frese actuator replacements.
| Frese Model | Siemens Equivalent | Thrust | Voltage | Signal | Notes |
|---|---|---|---|---|---|
| 53-1297 (Type 02) | SAX81.00 | 800 N | 24V AC | 0–10V Modulating | Ideal for flanged globe valves |
| 53-1296 (Type 01) | SAX61.03 | 400 N | 24V AC/DC | 0–10V Modulating | Suitable for smaller threaded valves |
Note: The legacy Siemens SQX62.00 and SQX82.00 are now obsolete and have been replaced by the SAX61.03 and SAX81.00 series respectively.
Why SAX Replaces SQX Series
| Feature | SQX Series (Obsolete) | SAX Series (Current) |
|---|---|---|
| Availability | Discontinued | In production |
| Control Signal | 0–10V / 3-Position | 0–10V Modulating |
| Voltage | 24V AC | 24V AC/DC |
| Stroke | 20 mm | 20 mm |
| IP Rating | IP54 | IP54 |
| BMS Compatibility | Good | Excellent |
| Energy Efficiency | Standard | Improved |
Key Point: If your application specifically requires 3-position control, consider adding an external relay module with SAX, or source remaining SQX stock while it’s still available.
Installation Notes
Mounting kits may vary between Frese and Siemens actuators.
Ensure compatibility with your valve body (threaded vs flanged).
Allow time for recalibration or signal adjustment when switching to Siemens control logic.
Siemens offers actuator accessories like position indicators and feedback modules if needed.
Downloadable Resources
Where to Buy
Looking to purchase Siemens equivalents or need a custom quotation?
👉 Request a Quote from BuildMEP
Buying links
Final Thoughts
Replacing Frese actuators with Siemens models is a technically safe and commercially viable choice—if done with proper selection. With the SQX series being phased out, moving to SAX actuators ensures long-term support, compliance, and BMS integration.
If you’re unsure about compatibility, contact us and we’ll help you cross-reference with confidence.
3 Comments
Appreciate the insight
Nicely articulated
magnificent publish, very informative. I’m wondering why the opposite specialists of this sector don’t notice this. You should proceed your writing. I’m confident, you have a huge readers’ base already!