The Siemens SQM33.511A9 is an electromechanical actuator for driving and positioning air dampers, gas dampers, and oil control valves in industrial burner systems. It delivers 3 Nm rated torque (3 Nm holding torque with power, 2.6 Nm without power) with 15-60 second adjustable running time for 90° rotation over a maximum 160° angular range. Operating on 24V AC/DC, it accepts analog control signals (2-10V, 4-20mA), provides position feedback output, and includes 2 limit switches plus 6 auxiliary switches. At 1.4 kg with a 3m cable, it is compatible with Siemens LMV burner management and electronic fuel/air ratio control systems. Applications include modulating burner control for industrial boilers, process heaters, and thermal oil systems.
**Q: What is the difference between SQM33 and SQM3x series?**
A: The SQM33 offers higher torque (3 Nm) and more auxiliary switches (6) compared to smaller SQM3x variants, suitable for larger dampers and valves.
**Q: Can the SQM33.511A9 be used with 230V supply?**
A: No, this model operates on 24V AC/DC. Siemens offers 230V variants in the SQM3 series for direct mains operation.
**Q: Does this actuator provide position feedback?**
A: Yes, it provides an analog position feedback signal compatible with burner management system inputs.
