SQM40.274R10SC Siemens Actuator

Overview

The Siemens SQM40.274R10SC is a high-performance electromotoric actuator designed for the precise positioning of flow control valves, butterfly valves, dampers, and other components requiring rotary motion. Engineered for use in industrial and commercial burner applications, this actuator provides reliable, load-dependent control of gas, oil, and combustion air. Its robust design features a counterclockwise rotation and is built to withstand demanding environments, ensuring long-term operational safety and efficiency in thermal process plants.

Features

• Counterclockwise (CCW) direction of rotation
• NEMA 4 weatherproof enclosure for protection against harsh environmental conditions
• Drive shaft disengagement clutch allowing for quick manual alignment with valves or linkages
• Internal position indication for real-time monitoring of the actuator status
• Durable mechanical design with a die-cast aluminum lower housing and impact-proof plastic cover
• UL and CSA certification, meeting rigorous safety and performance standards for North American markets
• 2-position control capability with integrated auxiliary switches for expanded functionality

Specifications

• Model: SQM40.274R10SC
• Operating Voltage: 110V AC (50/60 Hz)
• Torque: 90 in-lb (approximately 10 Nm)
• Running Time: 30 seconds for 90 degrees (at 60 Hz)
• Shaft Type: 3/8 inch Square Shaft (approximately 10mm)
• Rotation: Counterclockwise (CCW)
• Enclosure Rating: NEMA 4
• Designed Lifetime: 250,000 start cycles

Applications

• Supervision and control of gas and oil burners for medium to high capacity
• Positioning of butterfly valves and flow control valves in gas trains
• Load-dependent control of combustion air and fuel flow in thermal process plants
• Integration with 3-position or modulating controllers for precise HVAC system regulation
• Safety-critical applications requiring reliable spring return or precise rotary actuation