Siemens SAS61.33U 24V Spring-Return 0-10 VDC Actuator
Optimize your HVAC or terminal unit valve control with the Siemens SAS61.33U Spring-Return Actuator. Designed for precise modulation and fail-safe operation, this actuator delivers reliable performance for a variety of applications.
✅ Key Features
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✅ 24V AC/DC operation with low power consumption (3.0 Watts / 7.2 VA)
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✅ Spring-return fail-safe design ensures valve returns to normal position during power loss
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✅ Control signal: 0–10 VDC for smooth modulation
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✅ Nominal force: 90 lbs with 7/32" stroke for accurate valve movement
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✅ Position time: 30 seconds for fast response
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✅ Manual adjustment capability for on-site calibration
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✅ IP54 rated for protection against dust and water splashes
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✅ Replaces SQS65.5U for direct compatibility
📊 Specifications
| Feature | Specification |
|---|
| Model |
SAS61.33U |
| Type |
Spring-Return Actuator |
| Voltage |
24V AC/DC |
| Power Consumption |
3.0 W / 7.2 VA |
| Control Signal |
0–10 VDC |
| Nominal Force |
90 lbs |
| Nominal Stroke |
7/32" (5.5 mm) |
| Position Time |
30 s |
| IP Rating |
IP54 |
| Manual Adjustment |
Yes |
| Replacement For |
SQS65.5U |
| Compatible Valves |
Powermite 599 Series Terminal Unit Valves |
⚠️ Common Symptoms
Consider replacing the actuator if you notice:
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Valve not returning to normal position when power is lost
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Slow or erratic valve movement
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Failure to modulate according to control signal
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Abnormal noise or vibration during operation
❓ Frequently Asked Questions (FAQ)
Q: Can this actuator be used with 120V systems?
A: No, it requires 24V AC/DC, Class 2 supply.
Q: What type of valves is it compatible with?
A: Designed for Powermite 599 Series terminal unit valves with 7/32" stroke.
Q: Does it have a fail-safe feature?
A: Yes, the mechanical spring returns the valve to its default position if power is lost.
Q: Can I adjust it manually?
A: Yes, the actuator allows for manual adjustment for commissioning or maintenance.
🛒 Shopping Tips
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Verify your system uses 24V AC/DC, Class 2 supply
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Ensure compatibility with Powermite 599 Series terminal unit valves
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Use manual adjustment only during setup or maintenance to avoid disrupting automatic control
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Check the actuator’s IP54 rating to confirm it matches the installation environment
