SQM33.411A9 Siemens Actuator

Overview

The Siemens SQM33.411A9 is a high-precision electromotoric rotary actuator designed for the positioning of air dampers, gas dampers, oil control valves, and other ancillary equipment in industrial burner systems. Specifically engineered for integration with the Siemens LMV3 linkageless burner management system, this actuator uses a stepper motor and optical feedback to provide accurate, electronically controlled modulation. It is a critical component for optimizing combustion efficiency and reducing emissions by ensuring consistent and repeatable fuel-to-air ratio control.

Features

• High-accuracy stepper motor providing up to 900 motor positions through 90 degrees of rotation
• Integrated optical feedback system ensures precise positioning and evaluates deviations from required settings
• Modulating control via direct communication with LMV2 and LMV3 burner management systems
• Bi-directional operation with electronically selectable direction of rotation, eliminating the need for re-wiring
• Self-holding torque mechanism maintains position even when the unit is disconnected from power (at a reduced level)
• Durable construction featuring a die-cast aluminum housing and an impact-proof, heat-resistant plastic cover
• Pre-installed 3-meter (approx. 10-foot) cable with RAST2.5 connectors for simplified installation

Specifications

• Model: SQM33.411A9
• Operating Voltage: AC/DC 24 V ±20%
• Nominal Output Torque: 1.2 Nm
• Holding Torque (Live): 1.2 Nm
• Holding Torque (Dead): 0.8 Nm
• Running Time (90°): 5 to 120 seconds (dependent on the basic burner control unit)
• Angular Adjustment: Maximum 90°
• Protection Rating: IP54 (according to EN 60 529)
• Operating Temperature: -20°C to +60°C
• Cable Length: 3 meters (10 feet)
• Weight: Approximately 1.5 kg

Applications

• Modulation of air and gas dampers on forced draft oil and gas burners
• Control of fuel metering valves in medium to high-capacity industrial burner systems
• Integration into LMV36 and LMV37 linkageless burner management systems for parallel positioning
• Use in boiler plants and process heat generation systems requiring precise fuel-to-air ratio control
• Suitable for systems operating in continuous or intermittent modes, including steam boilers and commercial heating equipment