SQM20.18502 Siemens Actuator

Overview

The Siemens SQM20.18502 is a high-performance, reversible electromotoric actuator designed for the precise control of air dampers and control valves in oil and gas burner systems. This heavy-duty actuator features a synchronous motor that drives a 12mm shaft via a geartrain made of hardened steel, ensuring durability and consistent operation in demanding industrial and commercial HVAC environments. As a safety-critical component, it is commonly integrated by OEMs into burner control systems to optimize combustion efficiency and energy performance.

Features

• Reversible, locking-proof synchronous motor provides reliable positioning and control
• Impact-proof and heat-resistant plastic cover in dark grey for enhanced durability
• Die-cast aluminum gear train housing with four threaded holes for Pg11 cable glands
• Integrated cam stack with five adjustable auxiliary switches for versatile control signaling
• Manual cam adjustment allowed using an enclosed hook spanner or appropriate tool
• Maintenance-free gear train with geartwheels made of nitrated and hardened steel
• Internal setting scales located beside the cams for easy switching point positioning

Specifications

• Model: SQM20.18502
• Operating Voltage: AC 220 V to 240 V, 50/60 Hz
• Power Consumption: 9 VA
• Nominal Torque: 20 Nm
• Starting Torque: 20 Nm
• Holding Torque: 12 Nm
• Running Time: 45 seconds for 90 degrees (at 50 Hz)
• Direction of Rotation: Counterclockwise (facing the drive shaft)
• Drive Shaft Diameter: 12 mm
• Protection Rating: IP54 (when appropriate cable entry is used)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.7 kg

Applications

• Control of air dampers in industrial and commercial oil and gas burners
• Regulation of control valves for fuel and air flow in combustion systems
• Integration with burner controls and switching devices equipped with changeover contacts
• Use in HVAC systems requiring high-torque, precise electromotoric actuation
• Ideal for high-demand environments where heavy-duty gear construction is required for longevity