SQM40.165R11 Siemens Actuator

Overview

The Siemens SQM40.165R11 is a high-precision electromotoric actuator designed for the accurate positioning of air and gas dampers, flow control valves, and other ancillary equipment in combustion systems. Engineered for industrial and commercial burners of medium to higher capacity, this actuator provides load-dependent control of fuel and air flow. The “R” suffix indicates a North American version specifically designed to accommodate flexible conduit connections. It features a robust die-cast aluminum lower housing and a heat-resistant plastic cover, ensuring durability in demanding thermal process plants.

Features

• High Torque Output: Delivers a rated torque of 45 in-lb (approximately 5 Nm) for reliable operation of dampers and valves
• Precision Positioning: Position proportional control with three internal, easily adjustable auxiliary switches for flexible system integration
• Direction of Rotation: Optimized for counterclockwise (CCW) operation
• Drive Shaft Disengagement: Features a manual coupling pin (K1) that allows the shaft to be disengaged from the motor for setup or maintenance
• Weatherproof Design: Features a NEMA 4 rated housing cover for protection against environmental factors
• Maintenance-Free: Equipped with a stall-proof synchronous motor designed for a lifetime of approximately 250,000 start cycles

Specifications

• Model: SQM40.165R11
• Operating Voltage: AC 110 V (60 Hz)
• Torque: 45 in-lb (5 Nm)
• Running Time: 12.5 seconds for 90 degrees
• Rotation: Counterclockwise (CCW)
• Shaft Type: 10 mm D-shaft
• Angular Range: 0 to 90 degrees
• Auxiliary Switches: 3 internal switches
• Protection Rating: NEMA 4 / IP54 (when properly installed)
• Weight: Approximately 2.5 lb (1.13 kg)

Applications

• Load-dependent control of gas, oil, and combustion air in industrial burners
• Driving butterfly valves and dampers in medium to high-capacity heating systems
• Integration with thermal process plants and HVAC boiler systems
• Use in conjunction with 3-position or modulating controllers for precise fuel-air ratio control
• Suitable for applications requiring rotary motion in commercial combustion environments