SQM40.144R11SC Siemens Actuator

Overview

The Siemens SQM40.144R11SC is a high-precision electromotoric actuator designed for the accurate positioning of flow control valves, butterfly valves, and dampers in industrial and commercial burner applications. This modulating actuator provides reliable rotary motion for load-dependent control of gas, oil, and combustion air, ensuring optimal burner performance and efficiency. Engineered for medium to higher capacity systems, it features a rugged design and is compatible with various modulating controllers.

Features

• High-resolution electronic actuator with a counterclockwise (CCW) direction of rotation
• Modulating control version accepting analog input signals including 4 to 20 mA, 0 to 135 Ohm, and 2 to 10 VDC
• Adjustable limit and auxiliary switches for precise control of burner ignition and firing positions
• Drive shaft disengagement clutch for quick manual alignment during installation or maintenance
• Durable NEMA 4 weatherproof enclosure suitable for demanding industrial environments
• Internal position indication for real-time monitoring of the actuator status
• Zero and span adjustment capabilities for fine-tuning performance

Specifications

• Model: SQM40.144R11SC
• Torque: 45 in-lb (5 Nm)
• Running Time: 15 seconds for 90 degrees
• Operating Voltage: 110V – 120V AC (50/60 Hz)
• Drive Shaft: 3/8 inch (9.5mm) square shaft
• Rotation: Counterclockwise (CCW)
• Control Signal: 4-20 mA, 0-135 Ohm, 2-10 VDC
• Auxiliary Switches: Includes 3 internal switches
• Approvals: UL and CSA listed

Applications

• Positioning of air and gas dampers in oil and gas burners
• Control of flow control valves and butterfly valves in thermal process plants
• Load-dependent control of combustion air and fuel flow
• Used in conjunction with 3-position or modulating controllers for precise HVAC and boiler management
• Suitable for systems requiring high turndown ratios and reliable ignition sequences