SQM41.261A21 Siemens Actuator

Overview

The Siemens SQM41.261A21 is a high-precision electromotoric actuator designed for the load-dependent control of gas, oil, and combustion air in industrial and commercial burner systems. Engineered for clockwise rotation, this robust servo motor is used to drive butterfly valves, dampers, and oil pressure controllers that require reliable rotary motion. As a critical component in combustion and thermal process plants, it ensures optimal fuel-to-air ratios and safe burner operation.

Features

• High-torque performance with a rated torque of up to 10 Nm (approx. 90 in-lb)
• Synchronous motor design ensures consistent running times and precise positioning
• Disengageable drive shaft allows for manual adjustment and easy coupling to the motor
• Integrated cam-driven switching mechanism with three auxiliary switches for position feedback
• Robust construction featuring a die-cast aluminum lower housing and impact-resistant plastic cover
• Maintenance-free design with a long service life of approximately 250,000 start cycles

Specifications

• Model: SQM41.261A21
• Operating Voltage: AC 230 V (50/60 Hz)
• Running Time: 30 seconds for 90 degrees
• Rotation Direction: Clockwise (CW)
• Torque: 10 Nm / 90 in-lb
• Rotation Angle: Adjustable up to 90 degrees
• Shaft Type: 10mm diameter with Woodruff key
• Potentiometer: Included (single potentiometer version)
• Protection Rating: IP54 (NEMA 4 equivalent)
• Ambient Temperature: -20 C to +60 C

Applications

• Load-dependent control of combustion air and fuel flow in industrial burners
• Driving air dampers and gas butterfly valves in boiler systems
• Precise positioning of oil pressure controllers in large-capacity oil burners
• Integration with 3-position or modulating controllers for thermal process plants
• Use in HVAC systems requiring high-torque rotary actuation for ventilation dampers