SQM21.16502 Siemens Actuator

Overview

The Siemens SQM21.16502 is a heavy-duty, reversible electromotoric actuator designed for the precise control of air dampers and control valves in oil and gas burners. As part of the SQM2 series, this actuator is engineered for industrial and commercial burner applications that require robust performance and high torque. It features a clockwise direction of rotation (facing the drive shaft) and is equipped with a synchronous motor that ensures reliable positioning in conjunction with burner controllers or switching devices.

Features

• Heavy-duty design featuring gear train shafts made of hardened steel and nitrated gearwheels for enhanced durability
• Integrated position indicator visible from the outside for easy monitoring
• Reversible, locking-proof synchronous motor provides stable operation
• Five adjustable auxiliary switches and two end switches for flexible control configurations
• Disengageable gear train via a manual lever to allow for easy adjustment of the drive shaft
• Impact-proof and heat-resistant plastic cover with a die-cast aluminum gear train housing
• Maintenance-free operation thanks to self-lubricating sinter-bronze bearings

Specifications

• Model: SQM21.16502
• Operating Voltage: AC 220 V to 240 V, 50/60 Hz
• Nominal Torque: 20 Nm
• Starting Torque: 20 Nm
• Holding Torque: 12 Nm
• Running Time: 29 seconds for 90 degrees (at 50 Hz); 42 seconds for 130 degrees (at 50 Hz)
• Direction of Rotation: Clockwise
• Drive Shaft Diameter: 12 mm
• Power Consumption: 9 VA
• Degree of Protection: IP54
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.7 kg

Applications

• Precise positioning of air dampers in industrial oil and gas burners
• Control of fuel-to-air ratio valves in combustion systems
• Integration with Siemens burner controls, such as the LMV5 series, for optimized burner performance
• Suitable for use in HVAC systems, large boiler plants, and thermal processing applications requiring high-torque actuation