SQM41.261A21SC Siemens Actuator

Overview

The Siemens SQM41.261A21SC is a high-precision electromotoric actuator designed for the positioning of air dampers, gas valves, and other flow control components in industrial combustion systems. Engineered for reliability in demanding environments, this actuator provides clockwise rotation and is typically used in conjunction with 3-position or modulating controllers. It features a robust design with a die-cast aluminum lower housing and a heat-resistant plastic cover, making it suitable for medium to high-capacity oil and gas burners as well as thermal process plants.

Features

• Electromotoric actuation providing precise rotary motion for load-dependent control
• Clockwise direction of rotation (CW) for specific burner mounting configurations
• Integrated position proportional control with adjustable auxiliary switches
• Drive shaft disengagement clutch allowing for manual adjustment or maintenance
• Durable NEMA 4/IP66 rated enclosure suitable for various mounting orientations
• Synchronous motor ensures consistent running times and repeatable performance
• Internal position indication with adjustable cams for accurate limit and auxiliary switching

Specifications

• Model: SQM41.261A21SC
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque Output: 90 in-lb (10 Nm)
• Running Time: 30 seconds for 90 degrees
• Shaft Type: 10 mm keyed shaft
• Control Type: Line 3P-step (position proportional)
• Operating Temperature: -20 C to +60 C
• Power Consumption: 10 VA
• Certification: CE Approved

Applications

• Load-dependent control of gas, oil, and combustion air in industrial burners
• Positioning of flow control valves, butterfly valves, and dampers
• Integration with Siemens burner management systems like the LMV series
• Use in thermal process plants and high-turndown burner applications
• Suitable for HVAC and boiler systems requiring precise rotary actuation