SQM40.271R10SC Siemens Actuator

Overview

The Siemens SQM40.271R10SC is a high-precision electromotoric actuator designed for the positioning of air and gas dampers, flow control valves, and butterfly valves. Engineered for industrial and commercial burner applications, this actuator provides reliable rotary motion to ensure precise load-dependent control of fuel and combustion air. It features a robust design with a die-cast aluminum lower housing and a heat-resistant plastic cover, making it suitable for demanding thermal process plants.

Features

• Counterclockwise (CCW) rotation with a 90 degree operating angle
• High-torque performance rated at 90 in-lb (10 Nm)
• Integrated drive shaft disengagement clutch for easy manual alignment
• Internal position indication with clearly marked, adjustable limit and auxiliary switches
• NEMA 4 rated weatherproof enclosure for protection against harsh environments
• Maintenance-free gearwheels and bearings for long-term reliability
• UL listed and CSA certified for use in North American markets

Specifications

• Model: SQM40.271R10SC
• Operating Voltage: AC 110 V – 120 V (50/60 Hz)
• Torque: 90 in-lb (10 Nm)
• Running Time: 25 seconds for 90 degrees (at 60 Hz)
• Shaft Type: 10mm keyed shaft (Woodruff key)
• Auxiliary Switches: 5 internal switches plus 1 internal relay
• Protection Rating: NEMA 4 / IP66 (with suitable glands)
• Temperature Range: -20 C to +60 C

Applications

• Load-dependent control of gas, oil, and combustion air in burner systems
• Positioning of butterfly valves and flow control dampers in HVAC systems
• Integration with 3-position or modulating controllers for thermal process plants
• High-turndown burner applications requiring separate positions for ignition and low fire
• Industrial furnaces and medium to high-capacity boiler systems