Siemens Burner Damper Actuator SQM10.16502

Main Product Series – Function & Application Comparison

Typical Applications & Industries:
✓ Industrial oil and gas burners ✓ Air/fuel ratio control systems
✓ Combustion efficiency optimization ✓ Boiler control systems
✓ Process heating and power generation ✓ OEM burner manufacturing

Detailed Description – Siemens SQM Burner Damper Actuator Portfolio

1. Series Overview – Precision Combustion Actuators

The Siemens SQM series comprises electromechanical actuators designed for precise control of air dampers, gas valves, and oil control valves in industrial burner applications. These actuators ensure optimal air-to-fuel ratio across the burner’s firing range, maximizing combustion efficiency and reducing emissions. The portfolio spans multiple series to meet different torque and control requirements—from basic modulating actuators to advanced linkageless systems.

Key Family Features:

• ✓ Wide torque range – 1.2 Nm to 40 Nm, covering small to large burners

• ✓ Multiple voltage options – 24V DC and 230V AC variants available

• ✓ Adjustable rotation angles – 90° or 130° standard options

• ✓ Precise positioning – Adjustable cams and auxiliary switches for accurate control

• ✓ Manual override – Gear clutch for manual positioning during setup and maintenance

• ✓ Robust construction – Pressure and heat-resistant plastic housing, die-cast aluminum for larger models

• ✓ Internal/external position indication – Scales and viewing windows for visual feedback

• ✓ Long service life – Designed for up to 250,000 burner startup cycles (~10 years under normal operation)

• ✓ Global certifications – CE, UL, CSA, EAC compliant

2. SQM1… Series – Versatile Damper Actuator

The SQM1… series provides cost-effective, reliable modulation for small to medium burners. These actuators are ideal for driving gas fuel valves and dampers to achieve the best mixing ratio of fuel and combustion air.

Key Specifications:

• ✓ Torque: Up to 10 Nm

• ✓ Running time: 14–100 seconds (depending on rotation angle)

• ✓ Voltage: AC 230V standard

• ✓ Protection class: IP66 rated for harsh environments

• ✓ Connections: Screw terminals for easy wiring

• ✓ Features: Maintenance-free gear mechanism, built-in clutch, adjustable limit and auxiliary switches, internal position markers

Compatibility: Direct connection with combustion controllers (LOA.., LMO.., LMG.., LFL..) and RWF40 controllers.

Example Models:

• SQM10.16502 – 10 Nm, standard configuration, IP66

• SQM10.15562 – Popular model with high reliability

• SQM10.15502 – Alternative configuration

3. SQM2… Series – Medium Torque Actuator

The SQM2… series provides higher torque output for medium to large burner applications while maintaining the same modular design philosophy.

Key Specifications:

• ✓ Torque: Up to 20 Nm

• ✓ Running time: 29–66 seconds

• ✓ Features: Gear clutch function, internal/external position indication

Example Models:

• SQM20.18502 – Standard configuration

• SQM21.18502 – Alternative configuration

4. SQM33… Series – LMV3 Linkageless Actuator

The SQM33… series is specifically designed for use with Siemens LMV3 electronic fuel/air ratio control systems. These actuators enable precise, multi-position control without mechanical linkages.

Key Specifications:

• ✓ Torque range: 1.2 Nm to 10 Nm

• ✓ Voltage: 24V or 230V options

• ✓ Holding torque: Maintains position when powered (up to 10 Nm) or unpowered (up to 6 Nm)

• ✓ Radial load capacity: Up to 100 N

• ✓ Features: Multi-position capability, electronic positioning for precise ratio control

Example Models:

• SQM33.410A9 – 1.2 Nm, 1.5m cable

• SQM33.510A9 – 3 Nm, 1.5m cable

• SQM33.550A9 – 3 Nm, 3.6m cable, 24V

• SQM33.711A9 – 10 Nm, 3m cable, 24V

5. SQM4… Series – Precision Positioning Actuator

The SQM4… series offers high-precision electronic positioning for industrial boiler control and medium burner applications. These actuators provide reliable, repeatable motion for optimizing combustion efficiency.

Key Specifications:

• ✓ Torque: Up to 3 Nm (standard variants)

• ✓ Features: High-precision electronic positioning, compatible with electronic burner management systems

6. SQM5… Series – Heavy-Duty Actuator

The SQM5… series is designed for large-scale industrial burners and complex combustion systems requiring high torque and robust construction. These actuators offer the highest torque in the portfolio with reinforced gear trains for long-term reliability.

Key Specifications:

• ✓ Torque range: Up to 40 Nm

• ✓ Running time: 10–90 seconds

• ✓ Reversible rotation: Flexible mounting configurations

• ✓ Gear clutch function: Manual disengagement capability

• ✓ Multiple output options: Single or dual-shaft output with various shaft designs

• ✓ Auxiliary switches: Up to 8 for flexible control logic

• ✓ Integrated options: Electronic modules and potentiometers available ex-works

• ✓ Die-cast aluminum housing: Ultimate durability for demanding environments

Example Models:

• SQM50.260A204 – 10 Nm, 10s running time (90°), 4 auxiliary switches

• SQM50.380A2 – 15 Nm, 15s running time, 8 auxiliary switches

• SQM50.480A2 – 15 Nm, 34s running time, 8 auxiliary switches

• SQM56.687A2G3 – Heavy-duty configuration

7. SQM48… Series – LMV5 Linkageless System Actuator

The SQM48… series is designed for use with Siemens LMV5 linkageless combustion control systems, providing advanced multi-position capability without mechanical linkages.

Key Specifications:

• ✓ Torque: Up to 27 lb-in (3.05 Nm)

• ✓ Function: Controls air dampers and gas valves based on burner output

• ✓ Replaces: SQM48.497A9 (discontinued, replaced by SQM48.497B9)

Example Models:

• SQM48.497B9 – 27 lb-in, LMV5 linkageless system integration

Selection Guide – Understanding the Naming Convention (Siemens SQM)

Siemens SQM part numbers follow a structured logic for rapid selection.

Example: SQM50.260A204

Model Decoder Examples: