SQM40.261R11 Siemens Actuator

Overview

The Siemens SQM40.261R11 is a high-precision electromotoric actuator designed for the accurate positioning of air and gas dampers, oil control valves, and other auxiliary equipment in medium to large-capacity industrial and commercial burners. This robust actuator is specifically engineered for applications requiring rotary motion and is frequently used in thermal process plants to ensure optimal fuel-to-air ratios. As a counterclockwise (CCW) rotating model, it is built to operate seamlessly with burner controls or modulating controllers, providing reliable performance in demanding combustion environments.

Features

• Counterclockwise (CCW) direction of rotation
• Electromotoric drive providing up to 90 in-lb (10 Nm) of torque
• Equipped with 6 internal, easily adjustable auxiliary switches for flexible position signaling
• Integrated 1000 Ohm potentiometer for precise position feedback
• Drive shaft can be manually disengaged for quick alignment during installation or maintenance
• Robust construction with a die-cast aluminum lower housing and impact-resistant plastic cover
• UL listed and CSA approved for use in North American markets, including flexible conduit connection facilities

Specifications

• Model: SQM40.261R11
• Operating Voltage: AC 120 V (50/60 Hz)
• Torque: 90 in-lb (10 Nm)
• Running Time: 25 seconds for 90 degrees at 60 Hz (30 seconds at 50 Hz)
• Shaft Type: 10mm keyed shaft (Woodruff key)
• Control Type: Position proportional (3-position step)
• Protection Rating: NEMA 4 / IP66 (when used with suitable glands)
• Operating Temperature: -20 C to +60 C

Applications

• Load-dependent control of gas, oil, and combustion air flow in industrial burners
• Driving flow control valves, butterfly valves, and dampers
• Integration with Siemens burner management systems such as the LMV or LME series
• Use in thermal process plants requiring precise modulation and safety-critical positioning
• Suitable for both continuous and intermittent burner operations