SQM40.261A21SC Siemens Actuator

Overview

The Siemens SQM40.261A21SC is a high-precision electromotoric actuator designed for the positioning of flow control valves, butterfly valves, and dampers in industrial and commercial burner applications. This robust servomotor provides reliable counterclockwise rotation and is engineered for load-dependent control of gas, oil, and combustion air. It features a synchronous motor that is stall-proof and can be manually disengaged for easy alignment during installation.

Features

• Counterclockwise rotation with a 90 degree travel range
• Stall-proof synchronous motor ensures consistent performance under load
• Drive shaft can be manually disengaged from the motor via a coupling pin for quick alignment
• Integrated internal position indication for precise monitoring
• Adjustable cams and scales allow for easy setting of switching points
• Durable construction with a die-cast aluminum lower housing and impact-proof plastic cover
• NEMA 4 rated weatherproof enclosure for protection in demanding environments
• CE approved for compliance with international safety standards

Specifications

• Model: SQM40.261A21SC
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque Output: 90 in-lb (approx. 10 Nm)
• Running Time: 30 seconds for 90 degrees (at 50 Hz; 25 seconds at 60 Hz)
• Control Type: 3-position (step) control
• Shaft Type: 10 mm keyed shaft (Woodruff key)
• Auxiliary Switches: Up to 6 adjustable internal switches
• Potentiometer: Included (single potentiometer)
• Protection Rating: IP66 / NEMA 4

Applications

• Supervision and control of air and gas dampers in medium to high-capacity burners
• Driving oil pressure controllers and flow control valves in thermal process plants
• Load-dependent control of fuel and air flow in industrial heating systems
• Integration with Siemens burner management systems such as the LMV5 series