SQM41.241A21SC Siemens Actuator

Overview

The Siemens SQM41.241A21SC is a precision electromotoric actuator designed for the modulation of air and gas dampers, flow control valves, and butterfly valves in industrial and commercial combustion systems. Engineered for high-demand applications, this actuator provides reliable load-dependent control for oil and gas burners, ensuring optimal fuel-to-air ratios and efficient burner performance. Its robust design features a synchronous motor and a non-reactive gear train, housed in a durable, weatherproof enclosure.

Features

• Self-checking electronic version with analog control input for precise modulation
• Clockwise rotation with a 90 degree travel range
• Integrated drive shaft disengagement clutch for quick manual alignment with valves or linkages
• Internal position indication with adjustable cams and scales for easy switching point setup
• NEMA 4 rated weatherproof enclosure allows for installation in harsh environments without extra shielding
• Flexible mounting orientation with no restrictions on shaft positioning
• Maintenance-free design with a long service life of approximately 250,000 start cycles

Specifications

• Model: SQM41.241A21SC
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque: 10 Nm (90 in-lb)
• Running Time: 30 seconds for 90 degrees
• Control Signals: 4-20 mA, 0-135 ohm, or 2-10 VDC
• Shaft Type: 10 mm keyed shaft
• Rotation Direction: Clockwise (CW)
• Potentiometer: Single potentiometer included for position feedback
• Certifications: CE approved

Applications

• Load-dependent control of gas, oil, and combustion air in medium to high-capacity burners
• Precise positioning of butterfly valves and flow control valves in thermal process plants
• Modulation of air dampers in industrial boiler and furnace systems
• Integration with Siemens burner controls or external 3-position and modulating controllers
• Replacement of competitive actuators using available mounting brackets and adapters