SQM41.241R11 Siemens Actuator

Overview

The Siemens SQM41.241R11 is a high-precision, electromotoric rotary actuator designed to drive dampers and valves in oil and gas burners. As a member of the SQM4 series, this electronic version is engineered for load-dependent control of gas, oil, and combustion air flow in medium to large capacity thermal process plants. It features a robust NEMA 4 rated housing, making it suitable for demanding industrial environments without the need for additional weather shielding. The SQM41 variant specifically provides clockwise rotation and is designed for seamless integration with burner controls or modulating controllers.

Features

• NEMA 4 enclosure ensures protection against dust and water ingress for reliable outdoor or industrial use
• High-resolution electronic operation allows for precise positioning and repeatable control
• Versatile control options with analog inputs accepting 4-20 mA, 2-10 VDC, or 0-135 ohm signals
• Manual gear disengagement via a coupling pin (K1) for easy adjustment and maintenance
• Adjustable limit and auxiliary switches with clearly marked scales for easy setup
• Zero and span adjustment capability for fine-tuning analog control signals
• Maintenance-free design with a synchronous motor and permanently lubricated gear train
• UL and CSA approved for use in North American markets, including specialized “R” suffix for flexible conduit connections

Specifications

• Model: SQM41.241R11
• Direction of Rotation: Clockwise (CW)
• Rated Torque: 90 in-lb (10 Nm)
• Running Time: 25 to 30 seconds for 90 degrees
• Operating Voltage: AC 110 V – 120 V (50/60 Hz)
• Control Signal: 4-20 mA, 2-10 VDC, or 0-135 ohm
• Shaft Type: 10mm keyed shaft (Woodruff key)
• Housing Material: Die-cast aluminum lower housing with impact-proof plastic cover
• Potentiometer: Single 1000 Ohm 90 degree potentiometer
• Protection Rating: NEMA 4 / IP66
• Designed Lifetime: 250,000 start cycles (approx. 10 years)

Applications

• Load-dependent control of gas and air dampers in industrial and commercial burners
• Driving oil pressure controllers and butterfly valves in fuel trains
• Precise modulation in thermal process plants and high-capacity heating systems
• Integration with Siemens burner controls such as the LME7 series
• Use in HVAC applications requiring high-torque rotary motion and electronic modulation