SQM50.260R1 Siemens Actuator

Overview

The Siemens SQM50.260R1 is a high-precision reversing actuator designed for the accurate positioning of air and gas dampers, flow control valves, and butterfly valves in industrial and commercial burner systems. Engineered for reliability in medium to large capacity oil and gas burners, this electromotive actuator provides rotary motion to ensure optimal air-to-fuel ratios. As a base model, the SQM50.260R1 is typically supplied without a shaft, control board, or potentiometer, allowing for modular customization to meet specific application requirements.

Features

• Modular design supports exchangeable circuit boards, shafts, and potentiometers
• Internal auto/manual selector switch and forward/reverse toggle switch for simplified commissioning
• Disengagement clutches for the drive shaft and cam drum to facilitate quick manual alignment
• Six easily accessible internal switches including two limit switches and four auxiliary switches
• Externally visible position indicator for easy status monitoring
• Robust die-cast aluminum housing with impact-proof, heat-resistant plastic covers
• Maintenance-free gearwheels and bearings for long-term service life

Specifications

• Model: SQM50.260R1
• Operating Voltage: 110-120 VAC (50/60 Hz)
• Torque: 90 in-lbs (10 Nm)
• Running Time: 8 seconds (for 90 degree rotation)
• Rotation: Counterclockwise (anticlockwise) base rotation
• Protection Rating: IP54 (with appropriate cables/conduits)
• Temperature Range: -20 C to +60 C
• Approvals: UL and CSA certified versions available

Applications

• Load-dependent control of gas flow, oil volume, and combustion air in large burners
• Positioning of air dampers and gas butterfly valves in HVAC and process heating systems
• Industrial process heating requiring high modulating accuracy and repeatability
• Dual fuel applications utilizing auxiliary switches for separate ignition and fire positions
• Replacement of competitive actuators using various mounting brackets and shaft adapters