Overview
The Siemens SQM40.245R11SC is a compact, electromotoric actuator designed for the precise positioning of air and gas dampers, butterfly valves, and oil pressure controllers in combustion systems. Engineered for use in medium to high-capacity oil and gas burners, this reversing actuator provides reliable rotary motion for load-dependent flow control. It is a self-supervising unit that can be controlled by modulating controllers or directly by burner controls, ensuring optimal efficiency and safety in thermal process plants.
Features
- High-torque output of 90 in-lb (10 Nm) for handling industrial dampers and valves
- Versatile control compatibility accepting 4 to 20 mA, 0 to 135 ohm, and 2 to 10 Vdc signals
- Integrated drive shaft disengagement clutch for quick manual alignment and servicing
- Robust NEMA 4 weatherproof enclosure suitable for challenging industrial environments
- Internal position indication with adjustable cams and scales for precise switching point setup
- Maintenance-free gear train with a designed lifetime of 250,000 start cycles
Specifications
- Model: SQM40.245R11SC
- Operating Voltage: 110V AC (50/60 Hz)
- Torque: 90 in-lb (10 Nm)
- Running Time: Approximately 25 to 30 seconds for 90 degrees
- Direction of Rotation: Counterclockwise (CCW)
- Shaft Type: 10mm D-shaft
- Input Signals: 4-20 mA, 0-135 ohm, 2-10 Vdc
- Certifications: UL listed and CSA certified
Applications
- Load-dependent control of gas, oil, and combustion air in industrial burners
- Precise positioning of butterfly valves and air dampers in HVAC and boiler systems
- Integration with Siemens burner controls such as the LMV5 or LME series
- Use in thermal process plants requiring high-precision rotary actuators
- Direct drive applications for oil pressure controllers and modulation assemblies



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