SQM40.144R11 Siemens Actuator

Overview

The Siemens SQM40.144R11 is a high-precision electromotoric actuator designed for the accurate positioning of air and gas dampers, butterfly valves, and oil pressure controllers. This rotary actuator is engineered for use in industrial and commercial burner applications, particularly those requiring medium to high capacity and thermal process plants. As a modulating electronic version, it provides reliable, load-dependent control of fuel and combustion air, ensuring optimal efficiency and safety in combustion systems.

Features

• High-resolution electronic operation for precise flow control
• Counterclockwise (CCW) rotation direction
• NEMA 4 weatherproof enclosure for durability in harsh environments
• Internal position indicator for easy monitoring
• Drive shaft disengagement clutch for quick manual alignment
• Stall-proof synchronous motor ensures consistent performance
• Adjustable limit and auxiliary switches for advanced control integration
• Zero and span adjustment for analog control calibration

Specifications

• Model: SQM40.144R11
• Operating Voltage: AC 120 V (North American version)
• Rated Torque: 45 in-lb (5 Nm)
• Running Time: 12.5 to 15 seconds for 90 degrees (60 Hz)
• Control Input: 4-20 mA, 0-135 Ohm, or 2-10 VDC
• Shaft Type: 3/8 inch (9.5 mm) square shaft
• Auxiliary Switches: Includes 3 internal switches
• Approvals: UL and CSA certified

Applications

• Load-dependent control of gas, oil, and combustion air in burner systems
• Driving butterfly valves and dampers in HVAC and industrial boilers
• Integration into thermal process plants for precise fuel-air ratio control
• Emergency damper closure for safety-critical HVAC systems
• Use in combination with modulating controllers or directly via burner controls