SQM41.261A11SC Siemens Actuator

Overview

The Siemens SQM41.261A11SC is a high-precision electromotoric actuator designed for the accurate positioning of air dampers and gas or oil control valves. Engineered for clockwise (CW) rotation, this synchronous motor-driven unit is a critical component in medium to high-capacity burner systems and thermal process plants. It features a robust design with a die-cast aluminum lower housing and an impact-resistant plastic cover, ensuring durability in demanding industrial environments. The actuator is primarily used for load-dependent control of combustion air and fuel flow, supporting both 3-position and modulating control configurations.

Features

• Clockwise (CW) direction of rotation with a 90 degree operating angle
• Synchronous motor drive for consistent and reliable performance
• Drive shaft disengagement clutch allowing for quick manual alignment during installation
• Internal position indication with adjustable cams and scales for precise switching point settings
• Integrated auxiliary switches (typically 3 or 4 depending on configuration) for flexible control logic
• NEMA 4 / IP66 rated enclosure providing excellent protection against environmental factors
• Maintenance-free gearwheels and bearings for long-term operational reliability

Specifications

• Model: SQM41.261A11SC
• Operating Voltage: 110V to 120V AC (50/60 Hz)
• Torque Rating: 90 in-lb (10 Nm)
• Running Time: 30 seconds for 90 degrees (at 60 Hz)
• Shaft Type: 10mm Keyed Shaft
• Control Type: Line 3-Position Step
• Power Consumption: 10 VA
• Operating Temperature: -20 C to +60 C (-4 F to +140 F)
• Standards: CE and UL approved

Applications

• Load-dependent control of gas, oil, and combustion air in industrial and commercial burners
• Positioning of flow control valves and butterfly valves in thermal process plants
• Operation of air dampers in HVAC systems requiring precise rotary motion
• Use in connection with 3-position or modulating controllers such as the Siemens LMV5 or LME series
• Suitable for systems requiring separate positions for burner ignition and low fire operation