SQM50.381A2 Siemens Damper Motor

Overview

The Siemens SQM50.381A2 is a high-precision reversing actuator designed to drive air and gas dampers in oil and gas burners of medium to large capacity. Engineered for reliability in industrial and commercial environments, this actuator provides accurate positioning for flow control valves, butterfly valves, and dampers. It features a robust die-cast aluminum housing and impact-resistant plastic covers, ensuring durability for load-dependent control of fuel and combustion air.

Features

• Reversible and locking-proof synchronous motor for stable operation
• Internal and external position indication for easy monitoring
• Self-checking mechanism with adjustable cams for precise switching points
• Manual gear disengagement allows for adjustment during installation
• Maintenance-free gear train with nearly backlash-free performance
• Integrated internal heating to prevent condensation in cold environments
• Multiple auxiliary switches for enhanced control logic and signaling

Specifications

• Model: SQM50.381A2
• Operating Voltage: AC 220 V to 240 V (50/60 Hz)
• Rated Torque: 10 Nm (approx. 140 in-lbs)
• Running Time: 15 seconds for 90 degrees (at 50 Hz)
• Auxiliary Switches: 8 SPDT switches
• Drive Shaft: 10 mm diameter with Woodruff key (AGA58.1)
• Protection Rating: IP54 (NEMA 12)
• Operating Temperature: -20 C to +60 C

Applications

• Positioning of air and gas dampers in large industrial burners
• Control of flow control valves and butterfly valves in HVAC systems
• Load-dependent regulation of gas, oil, and combustion air mixtures
• Suitable for use with 3-position or modulating controllers (e.g., 4-20 mA)
• Integration into process heating systems requiring high repeatability