SQM40.244R11 Siemens Actuator

Overview

The Siemens SQM40.244R11 is a high-precision electromotoric rotary actuator designed for the modulating control of air and gas dampers, butterfly valves, and oil pressure controllers. This reversing actuator is engineered for industrial and commercial burner applications, providing accurate positioning to optimize fuel-to-air ratios. It features a robust, NEMA 4-rated enclosure, making it suitable for demanding environments without the need for additional weather shields. The SQM40.244R11 is specifically designed for counterclockwise rotation and is compatible with a variety of analog control signals, ensuring versatile integration into modern combustion and thermal process plants.

Features

• Modulating control input accepts 4-20 mA, 0-135 Ohm, and 2-10 VDC signals
• NEMA 4 / IP66 rated weatherproof enclosure allows for flexible mounting in any orientation
• Disengageable drive shaft via a coupling pin for easy manual alignment and maintenance
• Adjustable limit and auxiliary switches (3 internal switches) for precise travel control
• Stall-proof synchronous motor ensures reliable operation and longevity
• Internal position indication and adjustable zero and span for high-resolution performance
• UL listed and CSA approved for use in North American markets with “R” suffix for conduit connections

Specifications

• Model: SQM40.244R11
• Operating Voltage: 110V – 120V AC (50/60 Hz)
• Rated Torque: 90 in-lb (10 Nm)
• Running Time: 25 seconds for 90 degrees (at 60 Hz)
• Direction of Rotation: Counterclockwise (CCW)
• Drive Shaft: 3/8 inch square shaft
• Angular Range: Adjustable up to 90 degrees
• Potentiometer: Single 1000 Ohm 90 degree potentiometer
• Protection Rating: NEMA 4 / IP66

Applications

• Load-dependent control of gas, oil, and combustion air flow in industrial burners
• Precise positioning of butterfly valves and flow control valves
• Used in medium to high-capacity thermal process plants and boiler systems
• Integration with 3-position or modulating controllers and burner management systems like the Siemens LME or LMV series
• Ideal for high-turndown burner applications requiring reliable ignition and low-fire positioning