SQM50.261R1G3 Siemens Damper Motor

Overview

The Siemens SQM50.261R1G3 is a high-precision reversing actuator designed for the accurate positioning of air dampers, gas dampers, and fuel-control valves in medium to large capacity oil and gas burners. Engineered for industrial and commercial applications, this electromotive actuator provides reliable modulating control, ensuring optimal combustion efficiency. Its robust design includes die-cast aluminum housing and impact-resistant covers, making it suitable for demanding HVAC and process heating environments.

Features

• Reversing actuator with a synchronous motor for precise rotation and repeatability
• Internal and external position indicators for easy monitoring of shaft movement
• Integrated auto/manual switch and manual control toggle for simplified commissioning and troubleshooting
• Low hysteresis drive mechanism with double-offset design and potentiometer gearing
• Disengageable drive shaft and camshaft for independent adjustment and maintenance
• Field-exchangeable circuit boards and shafts to provide maximum installation flexibility

Specifications

• Model: SQM50.261R1G3
• Torque: 90 in-lbs (10 Nm)
• Running Time: 8 seconds for 90-degree rotation (at 60 Hz)
• Control Input: 4-20 mA
• Voltage: 110-120 VAC
• Rotation Direction: Counter-clockwise (CCW)
• Shaft: 10 mm diameter
• Number of Switches: 6 internal auxiliary switches
• Protection Rating: Designed for IP54 (NEMA 12) compliance

Applications

• Positioning of combustion air dampers and gas butterfly valves in industrial burners
• Load-dependent control of fuel and air volumes in heating and process systems
• Use in dual-fuel applications requiring separate ignition and fire positions
• Integration with 3-position or modulating controllers for high-accuracy burner modulation
• Replacement of competitive actuators in commercial boiler and furnace systems