SQM40.241R11SC Siemens Actuator

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