SQM40.264A21SC Siemens Actuator

Overview

The Siemens SQM40.264A21SC is a robust electromotoric actuator designed for the precise positioning of air and gas dampers, butterfly valves, and flow control valves. Engineered for industrial and commercial burner applications, this high-performance actuator provides reliable rotary motion for load-dependent control of combustion air, gas, and oil. It features a durable die-cast aluminum housing with a heat-resistant plastic cover, ensuring longevity in demanding thermal process plants and HVAC environments.

Features

• High-resolution electronic actuator providing precise positioning with minimal hunting
• Integrated shaft disengagement clutch for easy manual alignment and installation
• Adjustable cams with scales for simple setting of switching points and limit positions
• Internal position indication for real-time monitoring of rotation angle
• NEMA 4/IP66 rated enclosure for protection against dust and water ingress
• Synchronous motor design ensures consistent running times regardless of load

Specifications

• Model: SQM40.264A21SC
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque: 10 Nm (90 in-lb)
• Running Time: 30 seconds for 90 degrees
• Direction of Rotation: Counterclockwise (CCW)
• Shaft Type: 3/8 inch Square Shaft
• Auxiliary Switches: Up to 6 adjustable internal switches
• Approvals: CE, UL, and CSA certified

Applications

• Load-dependent control of combustion air, gas, and oil in industrial burners
• Driving butterfly valves and dampers in thermal process plants
• Modulation of fuel and air valves in high-turndown burner systems
• Use in conjunction with 3-position or modulating controllers (e.g., 4 to 20 mA)
• Integration into burner control systems for commercial boiler and HVAC applications