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Note: The legacy Siemens SQX62.00 and SQX82.00 are now obsolete and have been replaced by the SAX61.03 and SAX81.00 series respectively.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
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Mounting kits may vary between Frese and Siemens actuators.
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Ensure compatibility with your valve body (threaded vs flanged).
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Allow time for recalibration or signal adjustment when switching to Siemens control logic.
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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
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