Overview
The Siemens SQM40.241R11SC is a high-precision, electromotoric actuator designed for the modulating control of gas and oil burners. Part of the SQM40 series, this counter-clockwise (CCW) rotating actuator is engineered to accurately position flow control valves, butterfly valves, and air dampers. It is a critical component in industrial and commercial combustion systems, providing reliable, load-dependent control of gas, oil, and combustion air to ensure optimal burner performance and efficiency.
Features
- Modulating control via multiple input signals including 4-20 mA, 2-10 Vdc, and 0-135 ohm
- Counter-clockwise (CCW) rotation with a 90-degree operating range
- Integrated 135 ohm feedback potentiometer for precise position monitoring
- Durable NEMA 4 rated weatherproof enclosure suitable for various mounting orientations
- Drive shaft disengagement clutch for quick manual alignment during installation
- Internal position indication and adjustable auxiliary switches for system synchronization
- Robust design with a designed lifetime of 250,000 start cycles
Specifications
- Model: SQM40.241R11SC
- Operating Voltage: 110V – 120V AC (50/60 Hz)
- Rated Torque: 90 in-lb (10 Nm)
- Running Time: 25 to 30 seconds for 90 degrees
- Rotation Direction: Counter-clockwise (CCW)
- Drive Shaft: 10mm with Woodruff key
- Control Input: 4-20 mA, 2-10 Vdc, or 0-135 ohm
- Feedback: Single 135 ohm potentiometer
- Approvals: UL, CSA, and CE certified
Applications
- Load-dependent control of combustion air, gas, and oil flow in industrial burners
- Precise positioning of butterfly valves and dampers in HVAC and thermal process plants
- Use in high-turndown burner applications requiring reliable ignition and low-fire positions
- Integration with Siemens burner controls such as the LMV5 or LME series
- Suitable for medium to high-capacity commercial boiler systems



Reviews
There are no reviews yet.